Seoul, South Korea

Sungkonghoe University
Seoul, South Korea

Sungkonghoe University is a prestigious Anglican institution of higher education in South Korea. Sungkonghoe University's Motto is "Open, Serving, and Sharing" in the evangelical Christian tradition. The basic curriculum aims to form an independent and open intellect among ecumenical Christians. It promotes volunteerism and communities that encourage sharing. Wikipedia.

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Yi S.,Seoul National University of Science and Technology | Rhi J.,Sungkonghoe University | Kim S.,Seoul National University of Science and Technology | Lee J.,Research Division
Journal of Institute of Control, Robotics and Systems | Year: 2013

In this paper, a 3D coordinates acquisition method for a mechanical assembly is developed by using multiview X-ray images. The multi-view X-ray images of an object are obtained by a rotary table. From the rotation transformation, it is possible to obtain the 3D coordinates of corresponding edge points on multi-view X-ray images by triangulation. The edge detection algorithm in this paper is based on the attenuation characteristic of the X-ray. The 3D coordinates of the object points are represented on a graphic display, which is used for the inspection of a mechanical assembly. © ICROS 2013.

Hong K.W.,Broadcasting and Telecommunications Media Research Laboratory | Ryu W.,Broadcasting and Telecommunications Media Research Laboratory | Choi J.K.,KAIST | Lim C.-G.,Sungkonghoe University
ETRI Journal | Year: 2015

Cloud gaming services are heavily dependent on the efficiency of real-Time video streaming technology owing to the limited bandwidths of wire or wireless networks through which consecutive frame images are delivered to gamers. Video compression algorithms typically take advantage of similarities among video frame images or in a single video frame image. This paper presents a method for computing and extracting both graphics information and an object's boundary from consecutive frame images of a game application. The method will allow video compression algorithms to determine the positions and sizes of similar image blocks, which in turn, will help achieve better video compression ratios. The proposed method can be easily implemented using function call interception, a programmable graphics pipeline, and offscreen rendering. It is implemented using the most widely used Direct3D API and applied to a well-known sample application to verify its feasibility and analyze its performance. The proposed method computes various kinds of graphics information with minimal overhead. © 2015 ETRI.

Choi J.,Sungkonghoe University | Chung W.,University of Suwon
Communication and Medicine | Year: 2014

Using online survey data obtained from a total of 174 international students from outside Asia currentlyattending six universities in South Korea, this study tested hypotheses regarding the relationship between acculturative stress and depression, and theroles of social resources (e.g. social supports from the host country) and psychological resources (e.g. selfesteem and locus of control) in moderating the nature of the stress-depression relation. It was found that international students who reported that they had experienced acculturative stress, mainly due to language barriers and the perception of academic dissimilarities, had higher depression levels than those who reported fewer or no such experiences. This study also revealed a three-way interaction of all variables on depression, indicating that both social and psychological resources played moderating roles in diminishing the strength of the relationship between acculturative stress and depression. Based on those findings, it is argued that more proactive, culturally sensitive communication intervention efforts at South Korean colleges are needed to help the growing numbers of international students cope with acculturative stress and mental illness, which they often encounter in a new culture and education. © Copyright Equinox Publishing Ltd Sheffield.

Jeong Y.,Sungkonghoe University | Kim J.,LIG Nex1 | Han S.-J.,Yonsei University
Wireless Networks | Year: 2011

Scalability is one of the most important features that future wireless sensor networks (WSNs) should provide, and clustering is widely considered as a viable approach for high scalability. In the cluster-based architecture, the cluster heads play a key role in relaying messages between the sensor nodes and the sink. While the cluster heads are involved in both intra-cluster and inter-cluster communication, the latter typically requires transmission over much longer distance than the former. In this paper, we consider a scenario in which each cluster head is equipped with dual radios: IEEE 802.15.4 and IEEE 802.11 for intra-cluster and inter-cluster communication, respectively. IEEE 802.11 links between the cluster heads and the sink provide a high capacity backbone for large-scale WSNs. IEEE 802.15.4 and IEEE 802.11 share a lot of similarities including CSMA/CA MAC. Their operating spectrum also overlaps at the 2.4 GHz ISM band, and this may cause interference. We first experimentally measure how severe the interference can be, when two radios are concurrently used in a WSN. We, then, propose an interference mitigation solution which relies on adaptive aggregation of packets and adaptive transmission scheduling. Through prototyping and experimental evaluation, we show that the proposed scheme significantly reduces the interferences between the two types of radios. © 2011 Springer Science+Business Media, LLC.

Jeong Y.,Sungkonghoe University | Lakshmanan S.,Georgia Institute of Technology | Kakumanu S.,Georgia Institute of Technology | Sivakumar R.,Georgia Institute of Technology
Wireless Networks | Year: 2011

In this paper we present a new approach called cue-based networking that uses hints or cues about the physical environment to optimize networked application behavior. We define the notion of cues and describe how cues can be obtained using wireless sensor networks as the underlying platform. We identify both the research and system challenges that need to be addressed to realize benefits of the approach under a target application of video delivery over IP networks. In the process, we identify key challenges of wireless sensor networks, namely timeliness and robustness. We design an adaptive algorithm that balances the tradeoff between them satisfying both timeliness and robustness requirements. Through an implementation of the video delivery application using the proposed algorithm in a real home environment, we highlight the practical benefits of the proposed approach. © Springer Science+Business Media, LLC 2010.

Jeong Y.,Sungkonghoe University
New Genetics and Society | Year: 2016

Stem cells from umbilical cord blood are now being actively used in transplants, as well as for a wide range of other medical, research, therapeutic, and commercial purposes. In this incipient stage of stem cell treatments and products, however, expectations about the benefits, use, and distribution of cord blood stem cells vary significantly among relevant companies, scientists, donors, patients, and governments. Focusing on the use of cord blood in South Korea, this paper examines the contested expectations that exist among the parties involved with the donation and use of cord blood, and how the distribution of cord blood stem cells reflects these disparities. The emergence of cord blood economy has been accompanied by contested expectations related to an array of issues, including altruism, motherhood, wealth, nationalism, sharing, and ethical justification. Although donors often remain interested in the prospective use of the biomaterials, their concerns and expectations have been overlooked. © 2016 Informa UK Limited, trading as Taylor & Francis Group

Kim S.-H.,Yonsei University | Jeong Y.,Sungkonghoe University | Han S.-J.,Yonsei University
Computer Networks | Year: 2014

Several routing schemes have been proposed for intermittently connected mobile networks. In these schemes, a node carries a message and forwards the message to another node when they meet. To increase the delivery success rate and reduce the message delivery delay, the node to forward the message is selected based on such criteria as the probability that the node is likely to meet the destination. However, even if a node is suitable under such criteria, the contact duration may be too short to complete the message forwarding, which is called 'forwarding failure' in this paper. The risk of forwarding failure due to link disconnection during transmission has been mostly ignored in the existing routing schemes. In this paper we focus on avoiding forwarding failure. To this end, a large message is divided into smaller fragments, and we present a mathematical model to derive the optimal fragment size that minimizes message delivery delay. We then present a run-time algorithm which determines whether a current message fragment should be forwarded to a node encountered. Contact duration with the candidate node is estimated for this decision. Delayed forwarding and transmission power adjustment is incorporated into this algorithm to enhance energy efficiency of message forwarding. The benefits and feasibility of the proposed scheme are extensively evaluated by simulations and experiments. © 2014 Published by Elsevier Ltd.

Nam I.,Sungkonghoe University
Psychiatry Research | Year: 2016

In the wake of the increased interest in treatment for complicated grief (CG) symptoms, research has reported the promising effect of CG treatment (CGT) on CG symptoms. This study compared CGT with supportive counseling (SC) in terms of improvement in CG symptoms. A randomized trial design was used to compare the effectiveness of CGT with that of SC in treating CG symptoms, depressive symptoms, and social impairments. The primary outcome was the Inventory of Complicated Grief. Relative to SC, CGT resulted in improved CG symptoms and depressive symptoms. Among those receiving CGT, participants with a supportive person in their sessions showed more beneficial results in CG and depressive symptoms than those without a supportive person did. This suggests that CGT is superior to SC in reducing CG symptoms and depressive symptoms, and in improving work and social functions during bereavement. Moreover, having a supportive person plays a critical role in the effectiveness of CGT sessions. © 2016 Elsevier Ireland Ltd

Kim J.,Sungkonghoe University
Proceedings - 6th International Conference on Computer Sciences and Convergence Information Technology, ICCIT 2011 | Year: 2011

Web-service-based workflow computing for e-science has emerged as a paradigm to address the traditional challenge of heterogeneous distributed science computations. Workflow management systems based on chemical information are also employed for life sciences to accelerate scientific improvement. We have developed an infrastructure of chemoinformatics Web services that make those approaches efficient. In this paper, we describe a Web service wrapper for utilizing large volumes and various sources of chemical information within chemoinformatics workflows. The wrapper makes isolated applications as part of Web service processes. © 2011 AICIT.

PubMed | Sungkonghoe University
Type: Journal Article | Journal: Community mental health journal | Year: 2016

The financial difficulty of dementia caregivers and its effects on mental health has gained increasing attention from researchers. The present study examines the longitudinal relationship between financial difficulty and the depressive symptoms of dementia caregivers using matching methods to account for potential selection bias. Propensity score matching methods and mixed-effects models were used to determine the effects of financial difficulty on depressive symptoms among caregivers participating in the Resources for Enhancing Alzheimers Caregiver Health (REACH) intervention program. Propensity score matching confirmed that caregivers experiencing financial difficulty were more likely to have depressive symptoms. The results suggest that dementia caregivers require support for their financial difficulty. Future research should fully examine the complex relationship between financial difficulty and the mental health of caregivers and how this issue can be addressed through assessment and intervention methods.

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