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1. The development of the ProMAS: a Probabilistic Medication Adherence Scale

Author

Kleppe M, Lacroix J, Ham J, and Midden C

Subjects
Medicine (General), R5-920
Abstract

Mieke Kleppe,1,2 Joyca Lacroix,2 Jaap Ham,1 Cees Midden1 1Human Technology Interaction, Eindhoven University of Technology, Eindhoven, the Netherlands; 2Behavior, Cognition and Perception, Philips Research, Eindhoven, the Netherlands Abstract: Current self-report medication adherence measures often provide heavily skewed results with limited variance, suggesting that most participants are highly adherent. This contrasts with findings from objective adherence measures. We argue that one of the main limitations of these self-report measures is the limited range covered by the behaviors assessed. That is, the items do not match the adherence behaviors that people perform, resulting in a ceiling effect. In this paper, we present a new self-reported medication adherence scale based on the Rasch model approach (the ProMAS), which covers a wide range of adherence behaviors. The ProMAS was tested with 370 elderly receiving medication for chronic conditions. The results indicated that the ProMAS provided adherence scores with sufficient fit to the Rasch model. Furthermore, the ProMAS covered a wider range of adherence behaviors compared to the widely used Medication Adherence Report Scale (MARS) instrument, resulting in more variance and less skewness in adherence scores. We conclude that the ProMAS is more capable of discriminating between people with different adherence rates than the MARS. Keywords: questionnaire design, probabilistic models, methodology

Published
2015

3. Dynamic detection of mobile malware using smartphone data and machine learning

Author

de Wit, J. S. Panman, van der Ham, J., and Bucur, D.

Subjects
Computer Science - Cryptography and Security, Computer Science - Machine Learning, D.4.6
Abstract

Mobile malware are malicious programs that target mobile devices. They are an increasing problem, as seen in the rise of detected mobile malware samples per year. The number of active smartphone users is expected to grow, stressing the importance of research on the detection of mobile malware. Detection methods for mobile malware exist but are still limited. In this paper, we provide an overview of the performance of machine learning (ML) techniques to detect malware on Android, without using privileged access. The ML-classifiers use device information such as the CPU usage, battery usage, and memory usage for the detection of 10 subtypes of Mobile Trojans on the Android Operating System (OS). We use a real-life dataset containing device and malware data from 47 users for a year (2016). We examine which features, i.e. aspects, of a device, are most important to monitor to detect (subtypes of) Mobile Trojans. The focus of this paper is on dynamic hardware features. Using these dynamic features we apply state-of-the-art machine learning classifiers: Random Forest, K-Nearest Neighbour, and AdaBoost. We show classification results on different feature sets, making a distinction between global device features, and specific app features. None of the measured feature sets require privileged access. Our results show that the Random Forest classifier performs best as a general malware classifier: across 10 subtypes of Mobile Trojans, it achieves an F1 score of 0.73 with a False Positive Rate (FPR) of 0.009 and a False Negative Rate (FNR) of 0.380. The Random Forest, K-Nearest Neighbours, and AdaBoost classifiers achieve F1 scores above 0.72, an FPR below 0.02 and, an FNR below 0.33, when trained separately to detect each subtype of Mobile Trojans., Comment: 14 pages content, 22 pages total, to be published in ACM DTRAP (currently in last revision phase)

Published
2021
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9. Investigating the Effect of Relative Cultural Distance on the Acceptance of Robots

Author

Trovato, G., Ham, J. R. C., Hashimoto, K., Ishii, H., Takanishi, A., Hutchison, David, Editorial Board Member, Kanade, Takeo, Editorial Board Member, Kittler, Josef, Editorial Board Member, Kleinberg, Jon M., Editorial Board Member, Mattern, Friedemann, Editorial Board Member, Mitchell, John C., Editorial Board Member, Naor, Moni, Editorial Board Member, Pandu Rangan, C., Editorial Board Member, Terzopoulos, Demetri, Editorial Board Member, Tygar, Doug, Editorial Board Member, Weikum, Gerhard, Series Editor, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Tapus, Adriana, editor, André, Elisabeth, editor, Martin, Jean-Claude, editor, Ferland, François, editor, and Ammi, Mehdi, editor

Published
2015
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10. Study on Adaptation of Robot Communication Strategies in Changing Situations

Author

Trovato, G., Galeazzi, J., Torta, E., Ham, J. R. C., Cuijpers, R. H., Hutchison, David, Editorial Board Member, Kanade, Takeo, Editorial Board Member, Kittler, Josef, Editorial Board Member, Kleinberg, Jon M., Editorial Board Member, Mattern, Friedemann, Editorial Board Member, Mitchell, John C., Editorial Board Member, Naor, Moni, Editorial Board Member, Pandu Rangan, C., Editorial Board Member, Terzopoulos, Demetri, Editorial Board Member, Tygar, Doug, Editorial Board Member, Weikum, Gerhard, Series Editor, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Tapus, Adriana, editor, André, Elisabeth, editor, Martin, Jean-Claude, editor, Ferland, François, editor, and Ammi, Mehdi, editor

Published
2015
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12. Prospective validation of the prognostic relevance of CD34+CD38- AML stem cell frequency in the HOVON-SAKK132 trial.

Author

Ngai, L.L., Hanekamp, D., Janssen, F, Carbaat-Ham, J., Hofland, M.A.M.A., Fayed, M.M.H.E., Kelder, A., Oudshoorn-van Marsbergen, L., Scholten, W.J., Snel, A.N., Bachas, C., Tettero, J.M., Breems, D.A., Fischer, T., Gjertsen, B.T., Griškevičius, L., Juliusson, G., Loosdrecht, A.A. van de, Maertens, J.A., Manz, M.G., Pabst, T., Passweg, J.R., Porkka, K., Valk, P.J.M., Gradowska, P., Löwenberg, B., Leeuw, D.C. de, Janssen, J.J.W.M., Ossenkoppele, G.J., Cloos, J., Ngai, L.L., Hanekamp, D., Janssen, F, Carbaat-Ham, J., Hofland, M.A.M.A., Fayed, M.M.H.E., Kelder, A., Oudshoorn-van Marsbergen, L., Scholten, W.J., Snel, A.N., Bachas, C., Tettero, J.M., Breems, D.A., Fischer, T., Gjertsen, B.T., Griškevičius, L., Juliusson, G., Loosdrecht, A.A. van de, Maertens, J.A., Manz, M.G., Pabst, T., Passweg, J.R., Porkka, K., Valk, P.J.M., Gradowska, P., Löwenberg, B., Leeuw, D.C. de, Janssen, J.J.W.M., Ossenkoppele, G.J., and Cloos, J.

Abstract

Item does not contain fulltext

Published
2023

14. From persuasive applications to persuasive systems in non-communicable disease care-A systematic literature analysis

Author

Meschtscherjakov, Alexander, Midden, Cees, Ham, Jaap, Meschtscherjakov, A ( Alexander ), Midden, C ( Cees ), Ham, J ( Jaap ), Staehelin, Dario, Franke, Karolin; https://orcid.org/0000-0001-9014-7855, Huber, Luca, Schwabe, Gerhard; https://orcid.org/0000-0002-0453-9762, Meschtscherjakov, Alexander, Midden, Cees, Ham, Jaap, Meschtscherjakov, A ( Alexander ), Midden, C ( Cees ), Ham, J ( Jaap ), Staehelin, Dario, Franke, Karolin; https://orcid.org/0000-0001-9014-7855, Huber, Luca, and Schwabe, Gerhard; https://orcid.org/0000-0002-0453-9762

Abstract

Non-communicable diseases (NCDs) are the leading cause of global deaths and an increasing economic burden. Adherence to treatment among NCD patients is generally low due to the demanding treatment plans (i.e., lifestyle changes). Persuasive systems are a promising approach to complement traditional NCD care to support patients in behavior change and increase long-term adherence. However, we ask ourselves: To what extent does current persuasive systems research address the need for continuous, comprehensive, and adaptive NCD care? And where are the blind spots that need to be addressed by developers and researchers of more comprehensive persuasive systems? To answer these questions, we analyzed 57 articles on persuasive systems for NCD care in a systematic literature review. Our results show clear gaps in research and design of persuasive systems. We conceptualize comprehensive persuasive systems in the Fogg-PDSA matrix combining social (e.g., medical professionals) and technical aspects (i.e., persuasive applications) of persuasion.

Published
2023

17. Attitudes Toward a Virtual Smoking Cessation Coach: Relationship and Willingness to Continue

Author

Albers, N., Neerincx, M.A., Aretz, N.L., Ali, M., Ekinci, A., Brinkman, W.P., Meschtscherjakov, A, Midden, C., and Ham, J.

Subjects
Conversational agent, Behavior change, eHealth
Abstract

Virtual coaches have the potential to address the low adherence common to eHealth applications for behavior change by, for example, providing motivational support. However, given the multitude of factors affecting users’ attitudes toward virtual coaches, more insights are needed on how such virtual coaches can be designed to affect these attitudes in a specific use context positively. Especially valuable are insights that are based on users interacting with such a virtual coach for longer. We thus conducted a study in which more than 500 smokers interacted with the text-based virtual coach Sam in five sessions. In each session, Sam assigned smokers a new preparatory activity for quitting smoking and provided motivational support for doing the activity. Based on a mixed-methods analysis of users’ willingness to continue working and their relationship with Sam, we obtained eight themes for users’ attitudes toward Sam. These themes relate to whether Sam is seen as human or artificial, specific characteristics of Sam (e.g., caring character), the interaction with Sam, and the relationship with Sam. We used these themes to formulate literature-based recommendations to guide designers of virtual coaches for behavior change. For example, letting the virtual coach get to know users and disclose more information about itself may improve its relationship with users.

Published
2023

19. The Dominant Robot: Threatening Robots Cause Psychological Reactance, Especially When They Have Incongruent Goals

Author

Roubroeks, M. A. J., Ham, J. R. C., Midden, C. J. H., Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Ploug, Thomas, editor, Hasle, Per, editor, and Oinas-Kukkonen, Harri, editor

Published
2010
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22. Metropolis II: Investigating the Future Shape of Air Traffic Control in Highly Dense Urban Airspace

Author

Patrinopoulou, N., Daramouskas, I., Lappas, V., Kostopoulos, V., Veytia, A. M., Badea, C. A., Ellerbroek, J., Hoekstra, J., de Vries, V., van Ham, J., Sunil, E., Ponte Alonso, P. Menendez, Pedrero Gonzalez, J., Bereziat, D., Vidosavljevic, A., Sedov, L., University of Patras, Delft University of Technology (TU Delft), National Aerospace Laboratory [Amsterdam] (NLR), National Aerospace, NTT DATA, Laboratoire de recherche ENAC (ENAC-LAB), Ecole Nationale de l'Aviation Civile (ENAC), Linköping University (LIU), and European Project: 892928,M2

Subjects
BlueSky ATC Simulator, Unmanned Traffic Management (UTM), [SPI]Engineering Sciences [physics], Separation management, Urban Airspace, Flight planning, U-Space, Degree of Centralisation
Abstract

International audience; Metropolis II aims to provide insights in what is needed to enable high-density urban air operations. It does this by investigating the foundation for U-space U3/U4 services. The final goal is to provide a unified approach for strategic deconfliction, tactical deconfliction, and dynamic capacity management. Highly-dense operations in constrained urban airspace will likely require a degree of complexity that does not exist in modern-day air traffic management. The expected high traffic demand will require a shared use of the airspace instead of assigning exclusive use of blocks of the airspace to some flights. A unified approach for traffic management is needed because at high-densities, airspace design, flight planning, and separation management become increasingly interdependent. Metropolis II builds upon the results of the first Metropolis project. Three concepts with a varying degree of centralisation will be compared using simulations. (1) The centralised concept will take a global approach for separation management. (2) The decentralised concept aims to give the individual agents separation responsibility. (3) The hybrid concept tries to combine a centralised strategic planning agent with a robust tactical separation strategy.

Published
2022

25. Association Between Risk Perceptions of COVID-19, Political Ideology, and Mask-Wearing Behavior After the Outbreak: A Cross-Sectional Survey in South Korea

Author

Lee SY, Ham JH, Park HK, Jang DH, and Jang WM

Subjects
risk perception, mask-wearing behaviors, political ideology, Public aspects of medicine, RA1-1270
Abstract

Seung Yeon Lee,1,2 Ji Hye Ham,3 Hyun-Kyung Park,4 Deok Hyun Jang,5 Won Mo Jang6,7 1Department of Administration, Seoul National University Hospital, Seoul, South Korea; 2Office of External Affairs, Seoul Metropolitan Government-Seoul National University Boramae Medical Centre, Seoul, South Korea; 3Seoul Public Health Research Institute, Seoul Medical Center, Seoul, South Korea; 4Health Insurance Research Institute, National Health Insurance Service, Wonju, South Korea; 5Research Analytics & Communications, Gallup Korea, Seoul, South Korea; 6Department of Public Health and Community Medicine, Seoul Metropolitan Government-Seoul National University Boramae Medical Centre, Seoul, South Korea; 7Department of Health Policy and Management, Seoul National University College of Medicine, Seoul, South KoreaCorrespondence: Won Mo Jang, Department of Public Health and Community Medicine, Seoul Metropolitan Government – Seoul National University Boramae Medical Center, Seoul, 07061, South Korea, Tel +82-2-870-2165, Email thomasj@snu.ac.krPurpose: After the declaration by the World Health Organization signaling the conclusion of the COVID-19 pandemic, most countries lifted mandatory mask-wearing regulations. This study aimed to investigate factors such as risk perception and political ideology associated with continued adherence to mask-wearing among specific populations, particularly when it is no longer deemed necessary.Methods: We conducted a cross-sectional study including a sample of 1001 respondents stratified by sex, age (≥ 18 years), and region from January 31 to February 2, 2023, after the mandatory mask regulation was lifted in South Korea. Multivariate logistic regression models were applied to estimate the relationships between risk perceptions, political ideology, and mask-wearing maintenance, adjusting for factors such as sex, age, occupation, and trust in the government.Results: Our results indicated significant associations between age, self-reported household economic status, political ideology, affective risk perception, and perceived effectiveness of the government’s COVID-related measures with indoor mask-wearing. Specifically, liberals were more likely to keep mask-wearing indoors than conservatives (adjusted odds ratio [aOR]: 2.19; 95% confidence interval [CI]: 1.33– 3.59); and those who perceived a greater affective risk of COVID-19 (aOR: 2.47; 95% CI: 1.96– 3.10), along with those who perceived the government’s countermeasures as inadequate, were more inclined to maintain the habit of wearing masks indoors (aOR: 1.90; 95% CI: 1.19– 3.03).Conclusion: Our study highlighted the multifaceted factors influencing mask-wearing behavior in the post-COVID-19 era. Even after adjusting for various confounding factors, such as age, sex, and trust in the government, an association remained between affective risk perception, political ideology, and mask-wearing behavior. However, further research for psychological mechanisms is needed to foster a culture of preventive behaviors proportional to the risk of infection.Keywords: risk perception, mask-wearing behaviors, political ideology

Published
2024

26. Metropolis II: Investigating the Future Shape of Air Traffic Control in Highly Dense Urban Airspace

Author

Patrinopoulou, N. (author), Daramouskas, I. (author), Lappas, V. (author), Morfin Veytia, A. (author), Badea, C. (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author), De Vries, V. (author), Van Ham, J. (author), Patrinopoulou, N. (author), Daramouskas, I. (author), Lappas, V. (author), Morfin Veytia, A. (author), Badea, C. (author), Ellerbroek, Joost (author), Hoekstra, J.M. (author), De Vries, V. (author), and Van Ham, J. (author)

Abstract

Metropolis II aims to provide insights in what is needed to enable high-density urban air operations. It does this by investigating the foundation for U-space U3/U4 services. The final goal is to provide a unified approach for strategic deconfliction, tactical deconfliction, and dynamic capacity management. Highly-dense operations in constrained urban airspace will likely require a degree of complexity that does not exist in modern-day air traffic management. The expected high traffic demand will require a shared use of the airspace instead of assigning exclusive use of blocks of the airspace to some flights. A unified approach for traffic management is needed because at high-densities, airspace design, flight planning, and separation management become increasingly interdependent. Metropolis II builds upon the results of the first Metropolis project. Three concepts with a varying degree of centralisation will be compared using simulations. (1) The centralised concept will take a global approach for separation management. (2) The decentralised concept aims to give the individual agents separation responsibility. (3) The hybrid concept tries to combine a centralised strategic planning agent with a robust tactical separation strategy., Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public., Control & Simulation

Published
2022
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46. For Patients Listed for Simultaneous Liver Kidney Transplants, Retransplantation Has Significantly Inferior Liver Graft and Patient Survival Compared to Primary Simultaneous Liver Kidney Transplantation.: Abstract# C1980

Author

Rayhill, S., Bakthavatsalam, R., Nazarian, S., Sibulesky, L., Halldorson, J., Carithers, R., Bhattacharya, R., Landis, C., Liou, I., Yu, L., Leca, N., Kendrick, E., Kieran, N., Blosser, C., Montenovo, M., Javid, I., Aiyer, R., Perkins, J., Kayihan, A., Ham, J., and Reyes, J.

Published
2014

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