Vassilis Kostakos

“Hi! I am the Crowd Tasker” Crowdsourcing through Digital Voice Assistants

Danula Hettiachchi, Zhanna Sarsenbayeva, Fraser Allison, Niels van Berkel, Tilman Dingler, Gabriele Marini, Vassilis Kostakos, Jorge Goncalves

Conference Proceedings  |  2020  |  Proceedings of the 2020 CHI Conference on Human Factors in Computing Systems - CHI '20

Fitbit for learning: Towards capturing the learning experience using wearable sensing

MN Giannakos, K Sharma, S Papavlasopoulou, IO Pappas, V Kostakos

Journal article  |  2020  |  International Journal of Human-Computer Studies

Does Smartphone Use Drive our Emotions or vice versa? A Causal Analysis

Zhanna Sarsenbayeva, Gabriele Marini, Niels van Berkel, Chu Luo, Weiwei JIANG, Kangning YANG, Greg Wadley, Tilman Dingler, Jorge Goncalves, Vassilis Kostakos

Conference Proceedings  |  2020  |  Proceedings of the 2020 CHI Conference on Human Factors in Computing Systems - CHI '20

Overcoming compliance bias in self-report studies: A cross-study analysis

Niels van Berkel, Jorge Goncalves, Simo Hosio, Zhanna Sarsenbayeva, Eduardo Velloso, Vassilis Kostakos

Journal article  |  2020  |  International Journal of Human-Computer Studies

A Survey of Context Simulation for Testing Mobile Context-Aware Applications

Chu Luo, Jorge Goncalves, Eduardo Velloso, Vassilis Kostakos

Journal article  |  2020  |  ACM Computing Surveys

Microservices-based IoT application placement within heterogeneous and resource constrained fog computing environments

S Pallewatta, V Kostakos, R Buyya

Conference Proceedings  |  2019  |  Proceedings of the 12th IEEE/ACM International Conference on Utility and Cloud Computing

Measuring the effects of gender on online social conformity

S Wijenayake, N Van Berkel, V Kostakos, J Goncalves

Journal article  |  2019  |  Proceedings of the ACM on Human-Computer Interaction

Social conformity occurs when an individual changes their behaviour in line with the majority’s expectations. Although social conf..

Crowdsourcing perceptions of fair predictors for machine learning: A recidivism case study

N Van Berkel, J Goncalves, D Hettiachchi, S Wijenayake, RM Kelly, V Kostakos

Journal article  |  2019  |  Proceedings of the ACM on Human-Computer Interaction

Multimodal data as a means to understand the learning experience

Michail N Giannakos, Kshitij Sharma, Ilias O Pappas, Vassilis Kostakos, Eduardo Velloso

Journal article  |  2019  |  International Journal of Information Management

Most work in the design of learning technology uses click-streams as their primary data source for modelling & predicting learning..

Towards context-free semantic localisation

Gabriele Marini, Jorge Gonçalves, Eduardo Velloso, Raja Jurdak, Vassilis Kostakos

Conference Proceedings  |  2019  |  Proceedings of the 2019 ACM International Joint Conference on Pervasive and Ubiquitous Computing and Proceedings of the 2019 ACM International Symposium on Wearable Computers - UbiComp/ISWC '19

We propose a context-free semantic localisation approach to visualise and analyse indoor movements. We focus on settings where ind..

Effect of Ambient Light on Mobile Interaction

Zhanna Sarsenbayeva, Niels van Berkel, Weiwei Jiang, Danula Hettiachchi, Vassilis Kostakos, Jorge Goncalves

Conference Proceedings  |  2019  |  Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)

In this work we investigate the effect of ambient light on performance during mobile interaction. We evaluate three conditions of ..

Understanding smartphone notifications’ user interactions and content importance

Aku Visuri, Niels van Berkel, Tadashi Okoshi, Jorge Goncalves, Vassilis Kostakos

Journal article  |  2019  |  International Journal of Human-Computer Studies

We present the results of our experiment aimed to comprehensively understand the combination of 1) how smartphone users interact w..

Semantics-Aware Hidden Markov Model for Human Mobility

Hongzhi Shi, Hancheng Cao, Xiangxin Zhou, Yong Li, Chao Zhang, Vassilis Kostakos, Funing Sun, Fanchao Meng

Conference Proceedings  |  2019  |  SIAM International Conference on Data Mining, SDM 2019

Understanding human mobility bene ts numerous applications such as urban planning, tra c control and city management. Previous wor..

TPC Chairs' welcome

A Cox, V Kostakos

Conference Proceedings  |  2019  |  Conference on Human Factors in Computing Systems - Proceedings

CamTest: A laboratory testbed for camera-based mobile sensing applications

Chu Luo, Zewen Xu, Ruining Dong, Jorge Goncalves, Eduardo Velloso, Vassilis Kostakos

Journal article  |  2019  |  Pervasive and Mobile Computing

Effect of experience sampling schedules on response rate and recall accuracy of objective self-reports

Niels van Berkel, Jorge Goncalves, Lauri Loven, Denzil Ferreira, Simo Hosio, Vassilis Kostakos

Journal article  |  2019  |  International Journal of Human-Computer Studies

Measuring the Effects of Stress on Mobile Interaction

Zhanna Sarsenbayeva, Niels van Berkel, Danula Hettiachchi, Weiwei Jiang, Tilman Dingler, Eduardo Velloso, Vassilis Kostakos, Jorge Goncalves

Journal article  |  2019  |  Proceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies (IMWUT)

Research shows that environmental factors such as ambient noise and cold ambience can render users situationally impaired, adverse..

Improving experience sampling with multi-view user-driven annotation prediction

J Liono, FD Salim, N Van Berkel, V Kostakos, AK Qin

Conference Proceedings  |  2019  |  2019 IEEE International Conference on Pervasive Computing and Communications (PerCom

© 2019 IEEE. A fundamental challenge in real-time labelling of activity data is user burden. The Experience Sampling Method (ESM) ..

Verifying nondeterministic processes driven by broadcasts on Android

C Luo, X Ma, Y Tian, J Goncalves, E Velloso, V Kostakos

Conference Proceedings  |  2019  |  2019 IEEE 3rd Information Technology, Networking, Electronic and Automation Control Conference (ITNEC)

© 2019 IEEE. Broadcasts in Android facilitate inner-process and inter-process communications. Although broadcasts enable high scal..

Energy-efficient prediction of smartphone unlocking

Chu Luo, Aku Visuri, Simon Klakegg, Niels van Berkel, Zhanna Sarsenbayeva, Antti Mottonen, Jorge Goncalves, Theodoros Anagnostopoulos, Denzil Ferreira, Huber Flores, Eduardo Velloso, Vassilis Kostakos

Journal article  |  2019  |  Personal and Ubiquitous Computing

Effect of Cognitive Abilities on Crowdsourcing Task Performance

D Hettiachchi, N van Berkel, S Hosio, V Kostakos, J Goncalves

Conference Proceedings  |  2019  |  IFIP Conference on Human-Computer Interaction – INTERACT 2019

Task routing and assignment in crowdsourcing based on cognitive abilities

J Goncalves, M Feldman, S Hu, V Kostakos, A Bernstein

Conference Proceedings  |  2019  |  Proceedings of the 26th International Conference on World Wide Web (WWW ’17)

Situationally-Induced Impairments and Disabilities Research

Z Sarsenbayeva, J Goncalves, V Kostakos

Conference Proceedings  |  2019  |  ACM SIGCHI Conference on Human Factors in Computing Systems 2019 Extended Abstracts

Research has shown that various environmental factors impact smartphone interaction and lead to Situationally-Induced Impairments ..

Enabling Creative Crowd Work through Smart Speakers

Danula Hettiachchi, Niels van Berkel, Tilman Dingler, Fraser Allison, Vassilis Kostakos, Jorge Goncalves

Conference Proceedings  |  2019  |  ACM SIGCHI Conference on Human Factors in Computing Systems 2019 Extended Abstracts

Digital voice assistants or smart speakers have rapidly changed the landscape of voice user interfaces over the past few years. In..

Context-Informed Scheduling and Analysis: Improving Accuracy of Mobile Self-Reports

Niels van Berkel, Jorge Goncalves, Peter Koval, Simo Hosio, Tilman Dingler, Denzil Ferreira, Vassilis Kostakos

Conference Proceedings  |  2019  |  Proceedings of the 2019 CHI Conference on Human Factors in Computing Systems - CHI '19

Mobile self-reports are a popular technique to collect participant labelled data in the wild. While literature has focused on incr..

Improving wearable sensor data quality using context markers

Chaofan Wang, Zhanna Sarsenbayeva, Chu Luo, Jorge Goncalves, Vassilis Kostakos

Conference Proceedings  |  2019  |  Proceedings of the 2019 ACM International Joint Conference on Pervasive and Ubiquitous Computing and Proceedings of the 2019 ACM International Symposium on Wearable Computers - UbiComp/ISWC '19

A major challenge in human activity recognition over long periods with multiple sensors is clock synchronization of independent da..

PerCom Workshops 2018 Committees

H Flores, P Hui, V Kostakos

Conference Proceedings  |  2018  |  2018 IEEE International Conference on Pervasive Computing and Communications Workshops (PerCom Workshops)

Evidence-Aware Mobile Computational Offloading

Huber Flores, Pan Hui, Petteri Nurmi, Eemil Lagerspetz, Sasu Tarkoma, Jukka Manner, Vassilis Kostakos, Yong Li, Xiang Su

Journal article  |  2018  |  IEEE Transactions on Mobile Computing

Kinship verification from facial images and videos: human versus machine

Miguel Bordallo Lopez, Abdenour Hadid, Elhocine Boutellaa, Jorge Goncalves, Vassilis Kostakos, Simo Hosio

Journal article  |  2018  |  Machine Vision and Applications

Crowdsourcing treatments for low back pain

SJ Hosio, J Karppinen, EP Takala, J Takatalo, J Goncalves, N Van Berkel, S Konomi, V Kostakos

Conference Proceedings  |  2018  |  Proceedings of the 2018 CHI Conference on Human Factors in Computing Systems - CHI '18

MHC '18-International Workshop on Mobile Human Contributions: Opportunities and Challenges

Niels van Berkel, Simo Hosio, Jorge Goncalves, Katarzyna Wac, Vassilis Kostakos, Anna Cox

Conference Proceedings  |  2018  |  International Joint Conference on Pervasive and Ubiquitous Computing

Ubiquitous Mobile Sensing: Behaviour, Mood, and Environment

Aku Visuri, Kennedy Opoku Asare, Elina Kuosmanen, Yuuki Nishiyama, Denzil Ferreira, Zhanna Sarsenbayeva, Jorge Goncalves, Niels van Berke, Greg Wadley, Vassilis Kostakos, Sarah Clinch, Oludamilare Matthews, Simon Harper, Amy Jenkins, Stephen Snow, MC Schraefel

Conference Proceedings  |  2018  |  International Joint Conference on Pervasive and Ubiquitous Computing

Facilitating Collocated Crowdsourcing on Situated Displays

Simo Hosio, Jorge Goncalves, Niels van Berkel, Simon Klakegg, Shin'Ichi Konomi, Vassilis Kostakos

Journal article  |  2018  |  Human–Computer Interaction

Smartphone App Usage Prediction Using Points of Interest

D Yu, Y Li, F Xu, P Zhang, V Kostakos

Journal article  |  2018  |  Proceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies

Uniqueness in the City: Urban Morphology and Location Privacy

H Cao, J Feng, Y Li, V Kostakos

Journal article  |  2018  |  Proceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies

We investigate the potential for privacy leaks when users reveal their nearby Points-of-Interest (POIs). Specifically, we investig..

Effect of Distinct Ambient Noise Types on Mobile Interaction

Z Sarsenbayeva, N van Berkel, E Velloso, V Kostakos, J Goncalves

Journal article  |  2018  |  Proceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies

The adverse effect of ambient noise on humans has been extensively studied in fields like cognitive science, indicating a signific..

Evidence-Aware Mobile Cloud Architectures

H Flores, V Kostakos, S Tarkoma, P Hui, Y Li

Book Chapter  |  2018

The potential of mobile offloading has contributed towards the flurry of recent research activity known as mobile cloud computing...

Revisitation in Urban Space vs. Online: A Comparison across POIs, Websites, and Smartphone Apps

H Cao, Z Chen, F XU, Y Li, V Kostakos

Journal article  |  2018  |  Proceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies

Biased bots: Conversational agents to overcome polarization

T Dingler, A Choudhury, V Kostakos

Conference Proceedings  |  2018  |  International Joint Conference on Pervasive and Ubiquitous Computing

© Copyright held by the owner/author(s). In today's media landscape, emotionally charged topics including issues related to politi..

Assisted Medication Management in Elderly Care Using Miniaturised Near-Infrared Spectroscopy

S Klakegg, J Goncalves, A Visuri, C Luo, A Popov, N van Berkel, Z Sarsenbayeva, V Kostakos, S Hosio, S Savage, A Bykov, I Meglinski, D Ferreira

Journal article  |  2018  |  Proceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies

Near-infrared spectroscopy (NIRS) measures the light reflected from objects to infer highly detailed information about their molec..

SensorClone: A Framework for Harnessing Smart Devices with Virtual Sensors

Huber Flores, Pan Hui, Sasu Tarkoma, Yong Li, Theodoros Anagnostopoulos, Vassilis Kostakos, Chu Luo, Xiang Su

Conference Proceedings  |  2018  |  ACM Multimedia Systems Conference

IoT services hosted by low-power devices rely on the cloud infrastructure to propagate their ubiquitous presence over the Internet..

The Experience Sampling Method on Mobile Devices

Niels Van Berkel, Denzil Ferreira, Vassilis Kostakos

Journal article  |  2018  |  ACM Computing Surveys

Correlating Refugee Border Crossings with Internet Search Data

Panos Kostakos, Abhinay Pandya, Mourad Oussalah, Simo Hosio, Arash Sattari, Vassilis Kostakos, Niels van Berkel, Christoph Breidbach, Olga Kyriakouli

Conference Proceedings  |  2018  |  IEEE International Conference on Information Reuse and Integration

Informed Diet Selection: Increasing Food Literacy through Crowdsourcing

N van Berkel, S Hosio, J Goncalves, V Kostakos

Conference Proceedings  |  2018  |  ACM SIGCHI Conference on Human Factors in Computing Systems 2018 Extended Abstracts

FinDroidHR: Smartwatch Gesture Input with Optical Heartrate Monitor

Y Zhang, T Gu, C Luo, V Kostakos, A Seneviratne

Journal article  |  2018  |  Proceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies

A mobile scanner for probing liquid samples in everyday settings

W Jiang, G Marini, N Van Berkel, Z Sarsenbayeva, C Luo, X He, T Dingler, Y Kawahara, V Kostakos

Conference Proceedings  |  2018  |  International Joint Conference on Pervasive and Ubiquitous Computing

© 2018 Copyright held by the owner/author(s). Publication rights licensed to ACM. Our work investigates the use of a Near InfraRed..

Where's everybody? Comparing the use of heatmaps to uncover cities' tacit social context in smartphones and pervasive displays

Andreas Komninos, Jeries Besharat, Denzil Ferreira, John Garofalakis, Vassilis Kostakos

Journal article  |  2017  |  Information Technology & Tourism

Challenges of Situational Impairments during Interaction with Mobile Devices

Z Sarsenbayeva, N van Berkel, C Luo, V Kostakos, J Goncalves

Conference Proceedings  |  2017  |  Proceedings of the 29th Australian Conference on Computer-Human Interaction - OZCHI '17

User interaction with mobile devices can be negatively affected by contextual factors, known as situationally-induced impairments...

Gamification of Mobile Experience Sampling Improves Data Quality and Quantity

Niels Van Berkel, Jorge Goncalves, Simo Hosio, Vassilis Kostakos

Journal article  |  2017  |  Proceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies (IMWUT)

CrowdPickUp

Jorge Goncalves, Simo Hosio, Niels Van Berkel, Furqan Ahmed, Vassilis Kostakos

Journal article  |  2017  |  Proceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies (IMWUT)

TestAWARE: A Laboratory-Oriented Testing Tool for Mobile Context-Aware Applications

C Luo, M Kuutila, S Klakegg, D Ferreira, H Flores, J Goncalves, M Mäntylä, V Kostakos

Journal article  |  2017  |  Proceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies (IMWUT)

Sensing Cold-Induced Situational Impairments in Mobile Interaction Using Battery Temperature

Z Sarsenbayeva, N Van Berkel, A Visuri, S Rissanen, H Rintamaki, V Kostakos, J Goncalves

Journal article  |  2017  |  Proceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies (IMWUT)

Environmental exposure assessment using indoor/outdoor detection on smartphones

Theodoros Anagnostopoulos, Juan Camilo Garcia, Jorge Goncalves, Denzil Ferreira, Simo Hosio, Vassilis Kostakos

Journal article  |  2017  |  Personal and Ubiquitous Computing

We present an energy-efficient method for Indoor/Outdoor detection on smartphones. The creation of an accurate environmental expos..

Avoiding pitfalls when using machine learning in HCI studies

V Kostakos, M Musolesi

Journal article  |  2017  |  interactions

Towards commoditised near infrared spectroscopy

S Klakegg, J Goncalves, N Van Berkel, C Luo, S Hosio, V Kostakos

Conference Proceedings  |  2017  |  Proceedings of the 2017 Conference on Designing Interactive Systems - DIS '17

Near Infrared Spectroscopy (NIRS) is a sensing technique in which near infrared light is transmitted into a sample, followed by li..

Community Reminder: Participatory contextual reminder environments for local communities

Tomoyo Sasao, Shin'ichi Konomi, Vassilis Kostakos, Keisuke Kuribayashi, Jorge Goncalves

Journal article  |  2017  |  International Journal of Human-Computer Studies

Eliciting Structured Knowledge from Situated Crowd Markets

Jorge Goncalves, Simo Hosio, Vassilis Kostakos

Journal article  |  2017  |  ACM Transactions on Internet Technology

Tapping Task Performance on Smartphones in Cold Temperature

Jorge Goncalves, Zhanna Sarsenbayeva, Niels van Berkel, Chu Luo, Simo Hosio, Sirkka Risanen, Hannu Rintamazki, Vassilis Kostakos

Journal article  |  2017  |  Interacting with Computers

Social-aware hybrid mobile offloading

Huber Flores, Rajesh Sharma, Denzil Ferreira, Vassilis Kostakos, Jukka Manner, Sasu Tarkoma, Pan Hui, Yong Li

Journal article  |  2017  |  Pervasive and Mobile Computing

Editorial

Gregory D Abowd, Vassilis Kostakos, Silvia Santini, James Scott, Koji Yatani

Journal article  |  2017  |  Proceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies

Donating Context Data to Science: The Effects of Social Signals and Perceptions on Action-Taking

Yong Liu, Denzil Ferreira, Jorge Goncalves, Simo Hosio, Pratyush Pandab, Vassilis Kostakos

Journal article  |  2017  |  Interacting with Computers

Augmenting Creative Design Thinking using Networks of Concepts

Georgi V Georgiev, Kaori Yamada, Toshiharu Taura, Vassilis Kostakos, Matti Pouke, Sylvia Tzvetanova Yung, Timo Ojala

Conference Proceedings  |  2017  |  2017 IEEE Virtual Reality (VR)

Quantifying Sources and Types of Smartwatch Usage Sessions

Aku Visuri, Zhanna Sarsenbayeva, Niels van Berkel, Jorge Goncalves, Reza Rawassizadeh, Vassilis Kostakos, Denzil Ferreira

Conference Proceedings  |  2017  |  Proceedings of the 2017 CHI Conference on Human Factors in Computing Systems - CHI '17

Human Sensors on the Move

D Ferreira, V Kostakos, I Schweizer

Book Chapter  |  2017  |  Understanding complex systems

Large-scale Offloading in the Internet of Things

Huber Flores, Xiang Su, Vassilis Kostakos, Aaron Yi Ding, Petteri Nurmi, Sasu Tarkoma, Pan Hui, Yong Li

Conference Proceedings  |  2017  |  2017 IEEE International Conference on Pervasive Computing and Communications Workshops (PerCom Workshops)

Applying configurational analysis to IS behavioural research: a methodological alternative for modelling combinatorial complexities

Yong Liu, Jozsef Mezei, Vassilis Kostakos, Hongxiu Li

Journal article  |  2017  |  Information Systems Journal

Rapid Clock Synchronisation for Ubiquitous Sensing Services Involving Multiple Smartphones

Chu Luo, Henri Koski, Mikko Korhonen, Jorge Goncalves, Theodoros Anagnostopoulos, Shin'Ichi Konomi, Simon Klakegg, Vassilis Kostakos

Conference Proceedings  |  2017  |  Proceedings of the 2017 ACM International Joint Conference on Pervasive and Ubiquitous Computing and Proceedings of the 2017 ACM International Symposium on Wearable Computers on - UbiComp '17

Human Sensors

V Kostakos, J Rogstadius, D Ferreira, S Hosio, J Goncalves

Book Chapter  |  2017  |  Understanding complex systems

Modeling Mobile Code Acceleration in the Cloud

Huber Flores, Xiang Su, Vassilis Kostakos, Jukka Riekki, Eemil Lagerspetz, Sasu Tarkoma, Pan Hui, Yong Li, Jukka Manner

Conference Proceedings  |  2017  |  2017 IEEE 37th International Conference on Distributed Computing Systems (ICDCS)

Are Smartphones Ubiquitous? An in-depth survey of smartphone adoption by seniors

Anabela Berenguer, Jorge Goncalves, Simo Hosio, Denzil Ferreira, Theodoros Anagnostopoulos, Vassilis Kostakos

Journal article  |  2017  |  IEEE Consumer Electronics Magazine

Observing Human Activity Through Sensing

Sidharta Gautama, Martin Atzmueller, Vassilis Kostakos, Dominique Gillis, Simo Hosio

Book Chapter  |  2017  |  Understanding complex systems

Smartphone Detection of Collapsed Buildings During Earthquakes

Aku Visuri, Shin'ichi Konomi, Zeyun Zhu, Vassilis Kostakos, Denzil Ferreira

Conference Proceedings  |  2017  |  Proceedings of the 2017 ACM International Joint Conference on Pervasive and Ubiquitous Computing and Proceedings of the 2017 ACM International Symposium on Wearable Computers on - UbiComp '17

Challenges of quantified-Self: Encouraging self-Reported data logging during recurrent smartphone usage

A Visuri, N Van Berkel, C Luo, J Goncalves, D Ferreira, V Kostakos

Conference Proceedings  |  2017  |  HCI 2017: Digital Make Believe - Proceedings of the 31st International BCS Human Computer Interaction Conference, HCI 2017

Predicting Interruptibility for Manual Data Collection: A Cluster-Based User Model

Aku Visuri, Niels van Berkel, Chu Luo, Jorge Goncalves, Denzil Ferreira, Vassilis Kostakos

Conference Proceedings  |  2017  |  Proceedings of the 19th International Conference on Human-Computer Interaction with Mobile Devices and Services - MobileHCI '17

Vision-Based Happiness Inference: A Feasibility Case-Study

Zhanna Sarsenbayeva, Denzil Ferreira, Niels van Berkel, Chu Luo, Mikko Vaisanen, Vassilis Kostakos, Jorge Goncalves

Conference Proceedings  |  2017  |  Proceedings of the 2017 ACM International Joint Conference on Pervasive and Ubiquitous Computing and Proceedings of the 2017 ACM International Symposium on Wearable Computers on - UbiComp '17

Fragmentation or cohesion? Visualizing the process and consequences of information system diversity, 1993-2012

Yong Liu, Hongxiu Li, Jorge Goncalves, Vassilis Kostakos, Bei Xiao

Journal article  |  2016  |  European Journal of Information Systems

Social-Aware device-To-device communication: A contribution for edge and fog computing?

H Flores, R Sharma, D Ferreira, C Luo, V Kostakos, S Tarkoma, P Hui, Y Li

Conference Proceedings  |  2016  |  Proceedings of the 2016 ACM International Joint Conference on Pervasive and Ubiquitous Computing Adjunct - UbiComp '16

© 2016 ACM. The exploitation of the opportunistic infrastructure via Deviceto-Device (D2D) communication is a critical component t..

Measuring group dynamics in an elementary school setting using mobile devices

N Van Berkel, S Kopytin, S Hosio, J Malmberg, H Järvenoja, V Kostakos

Conference Proceedings  |  2016  |  Proceedings of the 2016 ACM International Joint Conference on Pervasive and Ubiquitous Computing Adjunct - UbiComp '16

© 2016 ACM. Mobile instrumentation provides researchers and professionals the opportunity to collect data on several aspects of hu..

Cyclist-aware traffic lights through distributed smartphone sensing

Theodoros Anagnostopoulos, Denzil Ferreira, Alexander Samodelkin, Muzamil Ahmed, Vassilis Kostakos

Journal article  |  2016  |  Pervasive and Mobile Computing

Worker Performance in a Situated Crowdsourcing Market

Jorge Goncalves, Simo Hosio, Yong Liu, Vassilis Kostakos

Journal article  |  2016  |  Interacting with Computers

Toward Meaningful Engagement with Pervasive Displays

Simo Hosio, Hannu Kukka, Jorge Goncalves, Vassilis Kostakos, Timo Ojala

Journal article  |  2016  |  IEEE Pervasive Computing

Mobile phone usage cycles: A torus topology for spherical visualisation

JR Williamson, J Williamson, V Kostakos, K Hamilton, J Green

Conference Proceedings  |  2016  |  Proceedings of the 2016 CHI Conference Extended Abstracts on Human Factors in Computing Systems - CHI EA '16

© 2016 Authors. In this paper we present a novel technique for visualising cyclical data on a spherical display. We developed a vi..

Practical simulation of virtual crowds using points of interest

Matti Pouke, Jorge Goncalves, Denzil Ferreira, Vassilis Kostakos

Journal article  |  2016  |  Computers, Environment and Urban Systems

Instrumenting Smartphones with Portable NIRS

Simon Klakegg, Chu Luo, Jorge Goncalves, Simo Hosio, Vassilis Kostakos

Conference Proceedings  |  2016  |  Proceedings of the 2016 ACM International Joint Conference on Pervasive and Ubiquitous Computing Adjunct - UbiComp '16

Situational Impairments to Mobile Interaction in Cold Environments

Zhanna Sarsenbayeva, Jorge Goncalves, Juan García, Simon Klakegg, Sirkka Rissanen, Hannu Rintamäki, Jari Hannu, Vassilis Kostakos

Conference Proceedings  |  2016  |  Proceedings of the 2016 ACM International Joint Conference on Pervasive and Ubiquitous Computing - UbiComp '16

Indoor Light Scavenging on Smartphones

Denzil Ferreira, Christian Schuss, Chu Luo, Jorge Goncalves, Vassilis Kostakos, Timo Rahkonen

Conference Proceedings  |  2016  |  Proceedings of the 15th International Conference on Mobile and Ubiquitous Multimedia - MUM '16

Leveraging Wisdom of the Crowd for Decision Support

S Hosio, J Goncalves, T Anagnostopoulos, V Kostakos

Conference Proceedings  |  2016  |  Proceedings of the 30th International BCS Human Computer Interaction Conference, HCI 2016

How to Validate Mobile Crowdsourcing Design? Leveraging Data Integration in Prototype Testing

Chu Luo, Miikka Kuutila, Simon Klakegg, Denzil Ferreira, Huber Flores, Jorge Goncalves, Vassilis Kostakos, Mika Mäntylä

Conference Proceedings  |  2016  |  Proceedings of the 2016 ACM International Joint Conference on Pervasive and Ubiquitous Computing Adjunct - UbiComp '16

A Systematic Assessment of Smartphone Usage Gaps

Niels van Berkel, Chu Luo, Theodoros Anagnostopoulos, Denzil Ferreira, Jorge Goncalves, Simo Hosio, Vassilis Kostakos

Conference Proceedings  |  2016  |  Proceedings of the 2016 CHI Conference on Human Factors in Computing Systems - CHI '16

A Data Hiding Approach for Sensitive Smartphone Data

Chu Luo, Angelos Fylakis, Juha Partala, Simon Klakegg, Jorge Goncalves, Kaitai Liang, Tapio Seppanen, Vassilis Kostakos

Conference Proceedings  |  2016  |  Proceedings of the 2016 ACM International Joint Conference on Pervasive and Ubiquitous Computing

Modelling Smartphone Usage: A Markov State Transition Model

Vassilis Kostakos, Denzil Ferreira, Jorge Goncalves, Simo Hosio

Conference Proceedings  |  2016  |  Proceedings of the 2016 ACM International Joint Conference on Pervasive and Ubiquitous Computing - UbiComp '16

Modeling consumer switching behavior in social network games by exploring consumer cognitive dissonance and change experience

Yong Liu, Hongxiu Li, Xiaoyu Xu, Vassilis Kostakos, Jukka Heikkila

Journal article  |  2016  |  Industrial Management & Data Systems

Monetary Assessment of Battery Life on Smartphones

Simo Hosio, Denzil Ferreira, Jorge Goncalves, Niels van Berkel, Chu Luo, Muzamil Ahmed, Huber Flores, Vassilis Kostakos

Conference Proceedings  |  2016  |  Proceedings of the 2016 CHI Conference on Human Factors in Computing Systems - CHI '16

Crowdsourcing Queue Estimations in Situ

Jorge Goncalvesi, Hannu Kukka, Ivan Sanchez, Vassilis Kostakosi

Conference Proceedings  |  2016  |  Proceedings of the 19th ACM Conference on Computer-Supported Cooperative Work & Social Computing

Motivating participation and improving quality of contribution in ubiquitous crowdsourcing

Jorge Goncalves, Simo Hosio, Jakob Rogstadius, Evangelos Karapanos, Vassilis Kostakos

Journal article  |  2015  |  Computer Networks

Workshop on mobile and situated crowdsourcing

J Goncalves, S Hosio, V Kostakos, M Vukovic, S Konomi

Conference Proceedings  |  2015  |  Proceedings of the 2015 ACM International Joint Conference on Pervasive and Ubiquitous Computing

Bazaar: A situated crowdsourcing market

J Goncalves, S Hosio, D Ferreira, T Anagnostopoulos, V Kostakos

Conference Proceedings  |  2015  |  Proceedings of the 2015 ACM International Joint Conference on Pervasive and Ubiquitous Computing

The curse of quantified-self: An endless quest for answers

N Van Berkel, C Luo, D Ferreira, J Goncalves, V Kostakos

Conference Proceedings  |  2015  |  Proceedings of the 2015 ACM International Joint Conference on Pervasive and Ubiquitous Computing

Urban traffic analysis through multi-modal sensing

Mikko Perttunen, Vassilis Kostakos, Jukka Riekki, Timo Ojala

Journal article  |  2015  |  Personal and Ubiquitous Computing

Climatic Effects on Planning Behavior (vol 10, e0126205, 2015)

Yong Liu, Vassilis Kostakos, Hongxiu Li

Journal article  |  2015  |  PLOS ONE

Securacy: An empirical investigation of android applications' network usage, privacy and security

D Ferreira, V Kostakos, A Beresford, J Lindqvist, A Dey

Conference Proceedings  |  2015  |  Proceedings of the 8th ACM Conference on Security & Privacy in Wireless and Mobile Networks - WiSec '15

© 2015 ACM. Smartphone users do not fully know what their apps do. For example, an applications' network usage and underlying secu..

Crowdsourcing Public Opinion Using Urban Pervasive Technologies: Lessons From Real-Life Experiments in Oulu

Simo Hosio, Jorge Goncalves, Vassilis Kostakos, Jukka Riekki

Journal article  |  2015  |  Policy & Internet

Climatic Effects on Planning Behavior

Yong Liu, Vassilis Kostakos, Hongxiu Li

Journal article  |  2015  |  PLOS ONE

Increasing the Reach of Government Social Media: A Case Study in Modeling Government-Citizen Interaction on Facebook

Jorge Goncalves, Yong Liu, Bin Xiao, Saad Chaudhry, Simo Hosio, Vassilis Kostakos

Journal article  |  2015  |  Policy & Internet

Revisitation analysis of smartphone app use

Simon Jones, Denzil Ferreira, Simo Hosio, Jorge Goncalves, Vassilis Kostakos

Conference Proceedings  |  2015  |  Proceedings of the 2015 ACM International Joint Conference on Pervasive and Ubiquitous Computing - UbiComp '15

The big hole in HCI research

V Kostakos

Journal article  |  2015  |  interactions

Life through the lens: a qualitative investigation of human behaviour with an urban photography service

Simo Hosio, Richard Harper, Kenton O Hara, Jorge Goncalves, Vassilis Kostakos

Conference Proceedings  |  2015  |  Proceedings of the 2015 British HCI Conference on - British HCI '15

The proliferation of computation in our everyday environment enables new types of interaction and communication devices. Understan..

AWARE: Mobile context instrumentation framework

D Ferreira, V Kostakos, AK Dey

Journal article  |  2015  |  Frontiers in ICT

The rise of ubiquitous instrumentation

V Kostakos, D Ferreira

Journal article  |  2015  |  Frontiers in ICT

Municipal WiFi and interactive displays: Appropriation of new technologies in public urban spaces

Johanna Ylipulli, Tiina Suopajarvi, Timo Ojala, Vassilis Kostakos, Hannu Kukka

Journal article  |  2014  |  Technological Forecasting and Social Change

Online Disclosure of Personally Identifiable Information with Strangers: Effects of Public and Private Sharing

Jayant Venkatanathan, Vassilis Kostakos, Evangelos Karapanos, Jorge Goncalves

Journal article  |  2014  |  Interacting with Computers

Spatio-temporal patterns link your digital identities

Mikko Perttunen, Vassilis Kostakos, Jukka Riekki, Timo Ojala

Journal article  |  2014  |  Computers, Environment and Urban Systems

An empirical investigation of mobile government adoption in rural China: A case study in Zhejiang province

Yong Liu, Hongxiu Li, Vassilis Kostakos, Jorge Goncalves, Simo Hosio, Feng Hu

Journal article  |  2014  |  Government Information Quarterly

Modeling What Friendship Patterns on Facebook Reveal About Personality and Social Capital

Yong Liu, Jayant Venkatanathan, Jorge Goncalves, Evangelos Karapanos, Vassilis Kostakos

Journal article  |  2014  |  ACM Transactions on Computer-Human Interaction

From cyberpunk to calm urban computing: Exploring the role of technology in the future cityscape

Hannu Kukka, Anna Luusua, Johanna Ylipulli, Tiina Suopajarvi, Vassilis Kostakos, Timo Ojala

Journal article  |  2014  |  Technological Forecasting and Social Change

Citizen Motivation on the Go: The Role of Psychological Empowerment

Jorge Goncalves, Vassilis Kostakos, Evangelos Karapanos, Mary Barreto, Tiago Camacho, Anthony Tomasic, John Zimmerman

Journal article  |  2014  |  Interacting with Computers

Multipurpose Public Displays: Can Automated Grouping of Applications and Services Enhance User Experience?

Christos Katsanos, Nikolaos Tselios, Jorge Goncalves, Tomi Juntunen, Vassilis Kostakos

Journal article  |  2014  |  International Journal of Human-Computer Interaction

Projective testing of diurnal collective emotion

Jorge Goncalves, Pratyush Pandab, Denzil Ferreira, Mohammad Ghahramani, Guoying Zhao, Vassilis Kostakos

Conference Proceedings  |  2014  |  Proceedings of the 2014 ACM International Joint Conference on Pervasive and Ubiquitous Computing - UbiComp '14 Adjunct

CHI 1994-2013: Mapping two decades of intellectual progress through co-word analysis

Y Liu, J Goncalves, D Ferreira, B Xiao, S Hosio, V Kostakos

Conference Proceedings  |  2014  |  Proceedings of the SIGCHI Conference on Human Factors in Computing Systems

Identity crisis of ubicomp?: mapping 15 years of the field’s development and paradigm change

Yong Liu, Jorge Goncalves, Denzil Ferreira, Simo Hosio, Vassilis Kostakos

Conference Proceedings  |  2014  |  Proceedings of the 2014 ACM International Joint Conference on Pervasive and Ubiquitous Computing - UbiComp '14 Adjunct

Tandem browsing toolkit: distributed multi-display interfaces with web technologies

Tommi Heikkinen, Jorge Goncalves, Vassilis Kostakos, Ivan Elhart, Timo Ojala

Conference Proceedings  |  2014  |  Proceedings of The International Symposium on Pervasive Displays - PerDis '14

We present the Tandem Browsing toolkit that allows developers to build multi-display and multi-user applications for pervasive dis..

Eliciting situated feedback: A comparison of paper, web forms and public displays

Jorge Goncalves, Simo Hosio, Yong Liu, Vassilis Kostakos

Journal article  |  2014  |  Displays

Exploring civic engagement on public displays

S Hosio, J Goncalves, V Kostakos, J Riekki

Book Chapter  |  2014

Mobile cloud storage: a contextual experience

Karel Vandenbroucke, Denzil Ferreira, Jorge Goncalves, Vassilis Kostakos, Katrien De Moor

Conference Proceedings  |  2014  |  Proceedings of the 16th international conference on Human-computer interaction with mobile devices & services - MobileHCI '14

Game of words: tagging places through crowdsourcing on public displays

Jorge Goncalves, Simo Hosio, Denzil Ferreira, Vassilis Kostakos

Conference Proceedings  |  2014  |  Proceedings of the 2014 conference on Designing interactive systems - DIS '14

Contextual experience sampling of mobile application micro-usage

Denzil Ferreira, Jorge Goncalves, Vassilis Kostakos, Louise Barkhuus, Anind K Dey

Conference Proceedings  |  2014  |  Proceedings of the 16th international conference on Human-computer interaction with mobile devices & services - MobileHCI '14

Pulse: low bitrate wireless magnetic communication for smartphones

Weiwei Jiang, Denzil Ferreira, Jani Ylioja, Jorge Goncalves, Vassilis Kostakos

Conference Proceedings  |  2014  |  Proceedings of the 2014 ACM International Joint Conference on Pervasive and Ubiquitous Computing - UbiComp '14 Adjunct

Situated crowdsourcing using a market model

Simo Hosio, Jorge Goncalves, Vili Lehdonvirta, Denzil Ferreira, Vassilis Kostakos

Conference Proceedings  |  2014  |  Proceedings of the 27th annual ACM symposium on User interface software and technology - UIST '14

Towards proximity-based passenger sensing on public transport buses

Vassilis Kostakos, Tiago Camacho, Claudio Mantero

Journal article  |  2013  |  Personal and Ubiquitous Computing

Traffic in the Smart City Exploring City-Wide Sensing for Traffic Control Center Augmentation

Vassilis Kostakos, Timo Ojala, Tomi Juntunen

Journal article  |  2013  |  IEEE Internet Computing

Ubiquitous mobile instrumentation

D Ferreira, C Koehler, E Karapanos, V Kostakos

Conference Proceedings  |  2013  |  Proceedings of the 2013 ACM conference on Pervasive and ubiquitous computing adjunct publication - UbiComp '13 Adjunct

Mobile phones allow us to reach people anywhere, at anytime. In addition to the benefits for end users, researchers and developers..

Introduction to the special issue on social networks and ubiquitous interactions

Vassilis Kostakos, Mirco Musolesi

Journal article  |  2013  |  International Journal of Human-Computer Studies

CrisisTracker: Crowdsourced social media curation for disaster awareness

J Rogstadius, M Vukovic, CA Teixeira, V Kostakos, E Karapanos, JA Laredo

Journal article  |  2013  |  IBM Journal of Research and Development

An online system with end-user services: Mining novelty concepts from tv broadcast subtitles

M Rautiainen, J Sarvanko, A Heikkinen, M Ylianttila, V Kostakos

Conference Proceedings  |  2013  |  Proceedings of the 19th ACM SIGKDD international conference on Knowledge discovery and data mining - KDD '13

Copyright © 2013 ACM. Better tools for content-based access of video are needed to improve access to time-continuous video data. P..

Time shifting patterns in browsing and search behavior for catch-up TV on the Web

M Rautiainen, A Heikkinen, S Sarvanko, K Chorianopoulos, V Kostakos, M Ylianttila

Conference Proceedings  |  2013  |  Proceedings of the 11th european conference on Interactive TV and video - EuroITV '13

Catch-up TV services on the Web have facilitated time-shifted TV viewing. However, there is limited information about user search ..

What makes you click: Exploring visual signals to entice interaction on public displays

H Kukka, H Oja, V Kostakos, J Goncalves, T Ojala

Conference Proceedings  |  2013  |  Proceedings of the SIGCHI Conference on Human Factors in Computing Systems - CHI '13

Where Am I? Location Archetype Keyword Extraction from Urban Mobility Patterns

Vassilis Kostakos, Tomi Juntunen, Jorge Goncalves, Simo Hosio, Timo Ojala

Journal article  |  2013  |  PLOS One

Multipurpose Public Displays: How Shortcut Menus Affect Usage

Vassilis Kostakos, Hannu Kukka, Jorge Goncalves, Nikolaos Tselios, Timo Ojala

Journal article  |  2013  |  IEEE Computer Graphics and Applications

Human interfaces for civic and urban engagement: HiCUE’13

Simo Hosio, Jorge Goncalves, Vassilis Kostakos, Keith Cheverst, Yvonne Rogers

Conference Proceedings  |  2013  |  Proceedings of the 2013 ACM conference on Pervasive and ubiquitous computing adjunct publication - UbiComp '13 Adjunct

Public Displays Invade Urban Spaces

Vassilis Kostakos, Timo Ojala

Journal article  |  2013  |  IEEE Pervasive Computing

KUUKKELI-TV: ONLINE CONTENT-BASED SERVICES AND APPLICATIONS FOR BROADCAST TV WITH LONG-TERM USER EXPERIMENTS

Mika Rautiainen, Arto Heikkinen, Jouni Sarvanko, Vassilis Kostakos, Mika Ylianttila

Conference Proceedings  |  2013  |  2013 IEEE International Conference on Multimedia and Expo Workshops (ICMEW)

Application discoverability on multipurpose public displays: popularity comes at a price

Simo Hosio, Jorge Goncalves, Vassilis Kostakos

Conference Proceedings  |  2013  |  Proceedings of the 2nd ACM International Symposium on Pervasive Displays - PerDis '13

An introduction for system developers to volunteer roles in crisis response and recovery

A Unknown

Conference Proceedings  |  2013  |  ISCRAM 2013 Conference Proceedings - 10th International Conference on Information Systems for Crisis Response and Management

Technological advances, such as software tools for citizen reporting, first responder support, and online collaborative informatio..

Narrowcasting in social media: Effects and perceptions

Jorge Goncalves, Vassilis Kostakos, Jayant Venkatanathan

Conference Proceedings  |  2013  |  Proceedings of the 2013 IEEE/ACM International Conference on Advances in Social Networks Analysis and Mining - ASONAM '13

Crowdsourcing on the spot: altruistic use of public displays, feasibility, performance, and behaviours

Jorge Goncalves, Denzil Ferreira, Simo Hosio, Yong Liu, Jakob Rogstadius, Hannu Kukka, Vassilis Kostakos

Conference Proceedings  |  2013  |  Proceedings of the 2013 ACM international joint conference on Pervasive and ubiquitous computing - UbiComp '13

Narrowcasting in Social Media: Effects and Perceptions

Jorge Goncalves, Vassilis Kostakos, Jayant Venkatanathan

Conference Proceedings  |  2013  |  2013 IEEE/ACM INTERNATIONAL CONFERENCE ON ADVANCES IN SOCIAL NETWORKS ANALYSIS AND MINING (ASONAM)

This is not classified: everyday information seeking and encountering in smart urban spaces

Hannu Kukka, Vassilis Kostakos, Timo Ojala, Johanna Ylipulli, Tiina Suopajarvi, Marko Jurmu, Simo Hosio

Journal article  |  2013  |  Personal and Ubiquitous Computing

Revisiting human-battery interaction with an interactive battery interface

Denzil Ferreira, Eija Ferreira, Jorge Goncalves, Vassilis Kostakos, Anind K Dey

Conference Proceedings  |  2013  |  Proceedings of the 2013 ACM international joint conference on Pervasive and ubiquitous computing - UbiComp '13

IncluCity: using contextual cues to raise awareness on environmental accessibility

Jorge Goncalves, Vassilis Kostakos, Simo Hosio, Evangelos Karapanos, Olga Lyra

Conference Proceedings  |  2013  |  Proceedings of the 15th International ACM SIGACCESS Conference on Computers and Accessibility - ASSETS '13

A network science approach to modelling and predicting empathy

Jayant Venkatanathan, Evangelos Karapanos, Vassilis Kostakos, Jorge Gonçalves

Conference Proceedings  |  2013  |  Proceedings of the 2013 IEEE/ACM International Conference on Advances in Social Networks Analysis and Mining - ASONAM '13

Two field trials on the efficiency of unsolicited bluetooth proximity marketing

T Ojala, F Kruger, V Kostakos, V Valkama

Conference Proceedings  |  2012  |  Proceedings of the 11th International Conference on Mobile and Ubiquitous Multimedia - MUM '12

Testdroid: Automated remote UI testing on android

J Kaasila, D Ferreira, V Kostakos, T Ojala

Conference Proceedings  |  2012  |  Proceedings of the 11th International Conference on Mobile and Ubiquitous Multimedia - MUM '12

Web tool for traffic engineers: Direct manipulation and visualization of vehicular traffic using google maps

T Juntunen, V Kostakos, M Perttunen, D Ferreira

Conference Proceedings  |  2012  |  Proceeding of the 16th International Academic MindTrek Conference on - MindTrek '12

Editorial

C Boyle

Journal article  |  2012  |  Proceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies (IMWUT)

From School Food to Skate Parks in a Few Clicks: Using Public Displays to Bootstrap Civic Engagement of the Young

S Hosio, V Kostakos, H Kukka, M Jurmu, J Riekki, T Ojala

Conference Proceedings  |  2012  |  Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)

Towards multi-application public interactive displays

T Lindén, T Heikkinen, V Kostakos, D Ferreira, T Ojala

Conference Proceedings  |  2012  |  Proceedings of the 2012 International Symposium on Pervasive Displays - PerDis '12

Lessons learned from large-scale user studies: Using android market as a source of data

D Ferreira, V Kostakos, AK Dey

Journal article  |  2012  |  International Journal of Mobile Human Computer Interaction

User studies with mobile devices have typically been cumbersome, since researchers have had to recruit participants, hand out or c..

Multipurpose Interactive Public Displays in the Wild: Three Years Later

Timo Ojala, Vassilis Kostakos, Hannu Kukka, Tommi Heikkinen, Tomas Linden, Marko Jurmu, Simo Hosio, Fabio Kruger, Daniele Zanni

Journal article  |  2012  |  Computer

ICTD Work, Plus mFeel

Joerg Doerflinger, Tom Gross, Olga Lyra, Evangelos Karapanos, Vassilis Kostakos, Ismael Cuadrado-Cordero, Luis Miguel Soria-Morillo, Luis Gonzalez-Abril, Juan Antonio Ortega-Ramirez, Ivan Pau de la Cruz, Miguel Angel Valero Duboy, Eiman Kanjo

Journal article  |  2012  |  IEEE Pervasive Computing

Training Users vs. Training Soldiers: Experiences from the Battlefield

Vassilis Kostakos

Journal article  |  2012  |  Communications of the ACM

Network, Personality and Social Capital

Jayant Venkatanathan, Evangelos Karapanos, Vassilis Kostakos, Jorge Goncalves

Conference Proceedings  |  2012  |  Proceedings of the 4th Annual ACM Web Science Conference

A Scalable Sensor Middleware for Social End-User Programming

S Faria, V KOSTAKOS

Book Chapter  |  2012

The motivation behind this book is threefold: to explore the capabilities, challenges, and applications of mobile context awarenes..

Workshop on Computer Mediated Social Offline Interactions (SOFTec 2012)

Nemanja Memarovic, Marc Langheinrich, Vassilis Kostakos, Geraldine Fitzpatrick, Elaine M Huang

Conference Proceedings  |  2012  |  UbiComp'12 - Proceedings of the 2012 ACM Conference on Ubiquitous Computing

UbiMI: Ubiquitous Mobile Instrumentation

Denzil Ferreira, Emiliano Miluzzo, Jonna Hakkila, Tom Lovett, Vassilis Kostakos

Conference Proceedings  |  2012  |  UBICOMP'12: PROCEEDINGS OF THE 2012 ACM INTERNATIONAL CONFERENCE ON UBIQUITOUS COMPUTING

UBI challenge: Research coopetition on real-world urban computing

T Ojala, V Kostakos

Conference Proceedings  |  2011  |  Proceedings of the 10th International Conference on Mobile and Ubiquitous Multimedia - MUM '11

The challenges and opportunities of designing pervasive systems for deep-space colonies

Vassilis Kostakos

Journal article  |  2011  |  Personal and Ubiquitous Computing

Sharing Ephemeral Information in Online Social Networks: Privacy Perceptions and Behaviours

Bernardo Reynolds, Jayant Venkatanathan, Jorge Goncalves, Vassilis Kostakos

Conference Proceedings  |  2011  |  IFIP Conference on Human-Computer Interaction

Who's Your Best Friend? Targeted Privacy Attacks In Location-sharing Social Networks

Vassilis Kostakos, Jayant Venkatanathan, Bernardo Reynolds, Norman Sadeh, Eran Toch, Siraj A Shaikh, Simon Jones

Conference Proceedings  |  2011  |  Proceedings of the 13th international conference on Ubiquitous computing - UbiComp '11

Towards egocentric fuel efficiency feedback

T Camacho, F Quintal, M Scott, V Kostakos, I Oakley

Conference Proceedings  |  2011  |  CEUR Workshop Proceedings

Intelligent Playgrounds: Measuring and Affecting Social Inclusion in Schools

Olga Lyra, Evangelos Karapanos, Vassilis Kostakos

Conference Proceedings  |  2011  |  Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)

Improving Users' Consistency When Recalling Location Sharing Preferences

Jayant Venkatanathan, Denzil Ferreira, Michael Benisch, Jialiu Lin, Evangelos Karapanos, Vassilis Kostakos, Norman Sadeh, Eran Toch

Conference Proceedings  |  2011  |  Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)

Haptics for Tangible Interaction: A Vibro-Tactile Prototype

Andrea Bianchi, Ian Oakley, Jong Keun Lee, Dong Soo Kwon, Vassilis Kostakos

Conference Proceedings  |  2011  |  Proceedings of the fifth international conference on Tangible, embedded, and embodied interaction - TEI '11

Understanding Human-Smartphone Concerns: A Study of Battery Life

Denzil Ferreira, Anind K Dey, Vassilis Kostakos

Conference Proceedings  |  2011  |  Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)

The Phone Lock: Audio and Haptic Shoulder-Surfing Resistant PIN Entry Methods for Mobile Devices

Andrea Bianchi, Ian Oakley, Vassilis Kostakos, Dong Soo Kwon

Conference Proceedings  |  2011  |  Proceedings of the fifth international conference on Tangible, embedded, and embodied interaction - TEI '11

Information to Go: Exploring In-Situ Information Pick-Up "In the Wild"

Hannu Kukka, Fabio Kruger, Vassilis Kostakos, Timo Ojala, Marko Jurmu

Conference Proceedings  |  2011  |  Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)

A wireless infrastructure for delivering contextual services and studying transport behavior

T Camacho, V Kostakos, C Mantero

Conference Proceedings  |  2010  |  13th International IEEE Conference on Intelligent Transportation Systems

Wireless detection of end-to-end passenger trips on public transport buses

V Kostakos, T Camacho, C Mantero

Conference Proceedings  |  2010  |  13th International IEEE Conference on Intelligent Transportation Systems

Running gestures: Hands-free interaction during physical activity

B Smus, V Kostakos

Conference Proceedings  |  2010  |  Proceedings of the 12th ACM international conference adjunct papers on Ubiquitous computing - Ubicomp '10

Making friends in life and online: Equivalence, micro-correlation and value in spatial and transpatial social networks

V Kostakos, J Venkatanathan

Conference Proceedings  |  2010  |  2010 IEEE Second International Conference on Social Computing

Hide and seek: Location sharing practices with social media

D Wagner, M Lopez, A Doria, I Pavlyshak, V Kostakos, I Oakley, T Spiliotopoulos

Conference Proceedings  |  2010  |  Proceedings of the 12th international conference on Human computer interaction with mobile devices and services - MobileHCI '10

Inferring social networks from physical interactions: a feasibility study

V Kostakos, PA Kostakos

Journal article  |  2010  |  International Journal of Pervasive Computing and Communications

Brief Encounters: Sensing, Modeling and Visualizing Urban Mobility and Copresence Networks

Vassilis Kostakos, Eamonn O'Neill, Alan Penn, George Roussos, Dikaios Papadongonas

Journal article  |  2010  |  ACM Transactions on Computer-Human Interaction

Space Syntax and Pervasive Systems

Vassilis Kostakos

Book Chapter  |  2010  |  Geojournal Library

Exploring Digital Encounters in the Public Arena

Ava Fatah Gen Schieck, Vassilis Kostakos, Alan Penn

Book Chapter  |  2010

Is the crowd's wisdom biased?: A quantitative analysis of three online communities

V Kostakos

Conference Proceedings  |  2009  |  2009 International Conference on Computational Science and Engineering

Understanding and measuring the urban pervasive infrastructure

Vassilis Kostakos, Tom Nicolai, Eiko Yoneki, Eamonn O'Neill, Holger Kenn, Jon Crowcroft

Journal article  |  2009  |  Personal and Ubiquitous Computing

Temporal graphs

Vassilis Kostakos

Journal article  |  2009  |  Physica A: Statistical Mechanics and its Applications

RFID in pervasive computing: State-of-the-art and outlook

George Roussos, Vassilis Kostakos

Journal article  |  2009  |  Pervasive and Mobile Computing

Designing Trustworthy Situated Services: an Implicit and Explicit Assessment of Locative Images' Effect on Trust

Vassilis Kostakos, Ian Oakley

Conference Proceedings  |  2009  |  Proceedings of the 27th international conference on Human factors in computing systems - CHI 09

Social networking 2.0

V Kostakos, E O'Neill, S Jones

Conference Proceedings  |  2008  |  Proceeding of the twenty-sixth annual CHI conference extended abstracts on Human factors in computing systems - CHI '08

Human-in-the-loop: Rethinking security in mobile and pervasive systems

V Kostakos, E O'Neill

Conference Proceedings  |  2008  |  Proceeding of the twenty-sixth annual CHI conference extended abstracts on Human factors in computing systems - CHI '08

Urban encounters: The game of real life

V Kostakos, E O'Neill

Conference Proceedings  |  2008  |  Proceeding of the twenty-sixth annual CHI conference extended abstracts on Human factors in computing systems - CHI '08

Urban computing to bridge online and real-world social networks

V Kostakos, E O'Neill

Book Chapter  |  2008

In this paper, we describe a platform that enables us to systematically study online social networks alongside their real-world co..

Improving Emergency Response to Mass Casualty Incidents

Marcus Lucas da Silva, Vassilis Kostakos, Mitsuji Matsumoto

Conference Proceedings  |  2008  |  2008 Sixth Annual IEEE International Conference on Pervasive Computing and Communications (PerCom)

Measuring Trust in Wi-Fi Hotspots

Tim Kindberg, Eamonn O'Neill, Chris Bevan, Vassilis Kostakos, Danae Stanton Fraser, Tim Jay

Conference Proceedings  |  2008  |  Proceeding of the twenty-sixth annual CHI conference on Human factors in computing systems - CHI '08

Prepare for UbiComp's judgment day [6]

V Kostakos

Journal article  |  2007  |  Communications of the ACM

Prepare for UbiComp's judgment day

Vassilis Kostakos

Journal article  |  2007  |  COMMUNICATIONS OF THE ACM

NFC on mobile phones: issues, lessons and future research

Vassilis Kostakos, Eamonn O'Neill

Conference Proceedings  |  2007  |  Fifth Annual IEEE International Conference on Pervasive Computing and Communications Workshops (PerComW'07)

Interacting with mobile and pervasive computer systems

V Kostakos, E O'Neill

Book Chapter  |  2006

In this chapter, we present existing and ongoing research within the Human-Computer Interaction group at the University of Bath in..

Designing urban pervasive systems

Vassilis Kostakos, Eamonn O'Neill, Alan Penn

Journal article  |  2006  |  Computer

Can we do without GUIs? Gesture and speech interaction with a patient information system

Eamonn O'Neill, Manasawee Kaenampornpan, Vassilis Kostakos, Andrew Warr, Dawn Woodgate

Journal article  |  2006  |  Personal and Ubiquitous Computing

Instrumenting the city: Developing methods for observing and understanding the digital cityscape

Eamonn O'Neill, Vassilis Kostakos, Tim Kindberg, Ava Fatah Gen Schiek, Alan Penn, Danae Stanton Fraser, Tim Jones

Conference Proceedings  |  2006  |  Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)

Design tools for pervasive computing in urban environments

A Fatah gen. Schieck, A Penn, V Kostakos, E O'Neill, T Kindberg, D Stanton Fraser, T Jones

Conference Proceedings  |  2006  |  INNOVATIONS IN DESIGN & DECISION SUPPORT SYSTEMS IN ARCHITECTURE AND URBAN PLANNING

Building common ground for face to face interactions by sharing mobile device context

Vassilis Kostakos, Eamonn O'Neill, Anuroop Shahi

Conference Proceedings  |  2006  |  Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)

UbiSoc 2005: First international workshop on social implications of ubiquitous computing

V Coroama, V Kostakos, C Magerkurth, IL De Vallejo

Conference Proceedings  |  2005  |  CHI '05 extended abstracts on Human factors in computing systems - CHI '05

The social implications of emerging technologies

V Kostakos, E O'Neill, L Little, E Sillence

Journal article  |  2005  |  Interacting with Computers

Easing the wait in the emergency room: Building a theory of public information systems

E O'Neill, D Woodgate, V Kostakos

Conference Proceedings  |  2004  |  DIS2004 - Designing Interactive Systems: Across the Spectrum

Pervasive computing in emergency situations

V Kostakos, E O'Neill

Conference Proceedings  |  2004  |  Proceedings of the Hawaii International Conference on System Sciences

Accurate measurement of hand-wash quality using sensor armbands: Instrument validation study (Preprint)

Chaofan Wang, Zhanna Sarsenbayeva, Xiuge Chen, Tilman Dingler, Jorge Goncalves, Vassilis Kostakos

Report

BACKGROUND Hand hygiene is a crucial and cost-effective method to prevent healthcare-associated infections..

Modeling interaction as a complex system

Niels van Berkel, Simon Dennis, Michael Zyphur, Jinjing Li, Andrew Heathcote, Vassilis Kostakos

Journal article  |  Human–Computer Interaction

Accurate measurement of hand-wash quality using sensor armbands: Instrument validation study (Preprint)

Chaofan Wang, Zhanna Sarsenbayeva, Xiuge Chen, Tilman Dingler, Jorge Goncalves, Vassilis Kostakos

Journal article  |  JMIR mHealth and uHealth