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22. A Social Dynamics Analysis of the Problems Raised in the Development of a Community Network: A Case Study of A-Net

Author

Shin, Dong Hee

Abstract

Introduction: This study investigates the processes involved in the development of a broadband community network in the Northeast USA. A community network project was studied by tracing the developmental processes from network design to the stabilisation of information infrastructure. Method: A case study was conducted on the broadband community network. Qualitative data were collected primarily through in-depth interviews, drawing on the retrospective data of diverse stakeholders: strategic policy groups, user groups, technical groups and functional groups. Archival documents from various sources were also collected and analysed to triangulate research findings. Analysis: Qualitative analyses were carried out on the data, which related to ninety-six interviews, 279 archival documents, and twenty-nine survey responses. The data were analyzed with thematic analysis using the Atlas.ti program. Results: The political economy of the development process has biased the development toward private interests and away from the public benefit, and toward lucrative services and intra-organizational connectivity and away from community-oriented uses. Conclusion: This study provides a conceptual base for understanding contemporary and future community networks by illustrating the applicability of the Social Construction of Technology Theory. It suggests that Constructive Technology Assessment would be valuable to include technology users in the technology design process.

Published
2007

24. Sparse Graph Representation Learning Based on Reinforcement Learning for Personalized Mild Cognitive Impairment (MCI) Diagnosis

Author

Ji, Chang-Hoon, Shin, Dong-Hee, Son, Young-Han, and Kam, Tae-Eui

Abstract

Resting-state functional magnetic resonance imaging (rs-fMRI) has gained attention as a reliable technique for investigating the intrinsic function patterns of the brain. It facilitates the extraction of functional connectivity networks (FCNs) that capture synchronized activity patterns among regions of interest (ROIs). Analyzing FCNs enables the identification of distinctive connectivity patterns associated with mild cognitive impairment (MCI). For MCI diagnosis, various sparse representation techniques have been introduced, including statistical- and deep learning-based methods. However, these methods face limitations due to their reliance on supervised learning schemes, which restrict the exploration necessary for probing novel solutions. To overcome such limitation, prior work has incorporated reinforcement learning (RL) to dynamically select ROIs, but effective exploration remains challenging due to the vast search space during training. To tackle this issue, in this study, we propose an advanced RL-based framework that utilizes a divide-and-conquer approach to decompose the FCN construction task into smaller sub-problems in a subject-specific manner, enabling efficient exploration under each sub-problem condition. Additionally, we leverage the learned value function to determine the sparsity level of FCNs, considering individual characteristics of FCNs. We validate the effectiveness of our proposed framework by demonstrating its superior performance in MCI diagnosis on publicly available cohort datasets.

Published
2024
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34. Out of the Loop: Problems in the development of next generation community networks

Author

Venkatesh, Murali and Shin, Dong-Hee

Subjects
Computer Science - Computers and Society, K.4.3
Abstract

Drawing on an ongoing longitudinal research study, we discuss problems in the development of five next generation community networking projects in central New York. The projects were funded under a state program to diffuse broadband technologies in economically depressed areas of the state. The networks are technologically complex and entail high costs for subscribers. The political economy of the development process has biased the subscriber base toward the resource rich and away from the resource poor, and toward tried-and-tested uses like Internet and intra-organizational connectivity and away from community-oriented uses. These trends raise troubling questions about network ontology and function, and about the relation between the network and its physical host community. The need for appropriate social policy, and new planning practices, is argued to effect desired change., Comment: 14 pages

Published
2001

47. Highly stable semitransparent solar cell employing graphene/WS2/LaVO3 vertical-heterostructure.

Author

Kim, Da Hee, Shin, Dong Hee, Jung, Dae Ho, Oh, Si Duck, Kim, Eun Ji, and Lee, Hosun

Abstract

Semi-transparent (ST) solar cells are attracting a lot of attention among researchers as they can effectively utilize solar energy in various fields such as building-integrated solar power generation and portable solar chargers. Here, we introduce an ST solar cell composed of triethylenetetramine (TETA)-doped graphene (Gr), WS2, and LaVO3. The device not only harvests solar energy thanks to its high light absorption in the ultraviolet-visible range but is also translucent due to its thin film composition. The photovoltaic parameters and average visible transmittance (AVT) of TETA-Gr/WS2/LaVO3 solar cells are highly dependent on the LaVO3 film thickness (t). Considering the correlation between efficiency and visual effects, the device has power conversion efficiency (PCE) of 5.07% and 35% AVT at t = 200 nm, suggesting that it is suitable for ST solar cells. To maximize the translucent properties of the device, the PCE of the device was further improved to 5.64% by using an Al reflective mirror. The durability of the cell was confirmed to maintain 91 and 84% of the original PCE even under continuous illumination of 1 Sun at 60 °C temperature (Ta) and 30% relative humidity (RH) and 80 °C Ta/50% RH for 1000 h. [ABSTRACT FROM AUTHOR]

Published
2024
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50. Voices of the Internet of Things: An Exploration of Multiple Voice Effects in Smart Homes

Author

Moon, Yohan, Kim, Ki Joon, Shin, Dong-Hee, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Streitz, Norbert, editor, and Markopoulos, Panos, editor

Published
2016
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