• Journal of Communications and Networks
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• v.18 no.3
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• pp.513-522
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• 2016

We propose a mechanism for monitoring load in quality of service (QoS)-enabled wireless networks and show how it can be used for network management as well as for dynamic pricing. Mobile network traffic, especially video, has grown exponentially over the last few years and it is anticipated that this trend will continue into the future. Driving factors include the availability of new affordable, smart devices, such as smart-phones and tablets, together with the expectation of high quality user experience for video as one would obtain at home. Although new technologies such as long term evolution (LTE) are expected to help satisfy this demand, the fact is that several other mechanisms will be needed to manage overload and congestion in the network. Therefore, the efficient management of the expected huge data traffic demands is critical if operators are to maintain acceptable service quality while making a profit. In the current work, we address this issue by first investigating how the network load can be accurately monitored and then we show how this load metric can then be used to provide creative pricing plans. In addition, we describe its applications to features like traffic offloading and user satisfaction tracking.

• Proceedings of the Korea Contents Association Conference
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• 2006.11a
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• pp.604-608
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• 2006

In ubiquitous home where a variety of home devices and sensors are inter-connected, various services can be provided through wired and wireless networks invisibly. The convenience of users can be maximized by using intelligent and adaptive interoperability technologies in the home. In this paper, we present the core techniques including context-awareness, management of context information from various sensors, an inference module using JESS and so on. Also we design the ubiquitous home service systems based on context-awareness.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.40 no.4
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• pp.22-29
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• 2003

In the virtual home environment (VHE), which was proposed to offer global roaming and personal service environment portability, user's profiles and service logics are conveyed from home network to visited network to provide services at the visited network. Because user's profiles and service logics may contain confidential information, some procedures for mutual authentication among entities for offering confidence are needed. For these issues, we propose and analyze three 3-Party mutual authentication Protocols adaptable to the VHE in 3G ; password based mutual authentication protocol, mutual authentication protocol with CHAP and key exchange and mutual authentication protocol with trusted third party.

• Human Ecology Research
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• v.55 no.4
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• pp.351-362
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• 2017

Collaborative consumption (CC) occurs in organized systems or networks in which participants conduct sharing activities in the form of renting, lending, trading, bartering, and swapping of goods, services, transportation solutions, space, or money. Information and communications technologies (ICTs) that have emerged with CC. CC is expected to alleviate social problems such as hyper-consumption, pollution, and poverty by lowering the cost of economic coordination. In this study, we investigate the influence of educational experience and expected benefits of CC participation (intended to using and providing CC) of Adolescent Consumers. The subjects for the study were 418 high school students. Data was analyzed through frequency analysis, mean, standard deviation, t-test, ANOVA, Pearson's correlation, and hierarchical multiple regression analysis using SPSS Win 21.0. The results of this study are as follows. First, the significant positive relationship found between CC participants (intent to use and provide CC), educational experience (home education, school education, and mass media) and expected benefits (social benefit, economic benefit, enjoyment, community effect, and reputation). Second, enjoyment, mass media, reputation, social benefit, home education and school education values were variables that influenced the using participation intention for CC. Third, the major variables influencing the providing participation intention CC were home education, enjoyment, gender, community effect, and mass media values.

• Annals of Occupational and Environmental Medicine
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• v.34
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• pp.18.1-18.12
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• 2022

Background: Little attention has been paid to the relationship between perceived discrimination and self-rated health (SRH) among foreign workers in Korea. Transnational ties with the home country are known to be critical among immigrants, as they allow the maintenance of social networks and support. Nonetheless, as far as we know, no studies have examined the impact of transnational ties on SRH itself and the relationship between perceived discrimination and SRH, which the current study tries to examine. Methods: Logistic regression analyses were conducted using the 2013 Survey on Living Conditions of Foreign Workers in Korea. Adult foreign workers from different Asian countries (n = 1,370) participated in this study. The dependent variable was good SRH and the independent variable was perceived discrimination. Transnational ties with the home country, as a moderating variable, was categorized into broad (i.e., contacting family members in the home country) vs. narrow types (i.e., visiting the home country). Results: Foreign workers who perceived discrimination had a lower rate of good SRH than those who did not perceive discrimination. Broad social transnational ties moderated the relationship between perceived discrimination and SRH; narrow social transnational ties did not. Conclusions: In line with previous studies, an association was found between perceived discrimination and SRH. Broad social transnational ties can be a good source of social support and buffer against the distress of perceived discrimination.

• Proceedings of the IEEK Conference
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• 2008.06a
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• pp.1191-1192
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• 2008

Recent advancement in wireless communications and electronics has enabled the development of low-cost sensor networks. The sensor networks can be used for various application areas(e.g., health, military, home). For different application areas, there are different technical issues that researchers are currently resolving. The current stats of the art of sensor networks is captured in this article, where solutions are discussed under their related protocol stack layer sections. This article also point out the open research issues and intends to spark new interests and developments in this field.

• ETRI Journal
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• v.34 no.3
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• pp.297-307
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• 2012

A femtocell is a small cellular base station, typically designed for use in a home or small business. The random deployment of a femtocell has a critical effect on the performance of a macrocell network due to co-channel interference. Utilizing the advantage of a multiple-input multiple-output system, each femto base station (FBS) is able to form a cluster and generates a precoding matrix, which is a modified version of conventional single-cell block diagonalization, in a cooperative manner. Since interference from clustered-FBSs located at the nearby macro user equipment (MUE) is the dominant interference contributor to the coexisting networks, each cluster generates a precoding matrix considering the effects of interference on nearby MUEs. Through simulation, we verify that the proposed algorithm shows better performance respective to both MUE and femto user equipment, in terms of capacity.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 2004.11a
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• pp.48-48
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• 2004

• Proceedings of the Korean Information Science Society Conference
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• 2005.11a
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• pp.664-666
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• 2005

본 논문에서는 적외선을 기반으로 하는 가정용 정보가전기기들을 실내 또는 실외에서 원격으로 제어 및 감시할 수 있는 가정용 정보가전기기 제어 시스템을 구현하였다. 무선 인터넷 접속이 가능한 PDA에 본 논문에서 구현한 클라이언트 응용 프로세서를 동작시키고 가정용 홈 서버에는 정보가전기기를 제어하기 위한 서버 응용 프로세서 및 필요한 제어용 하드웨어 장치들을 부착하였다. 클라이언트 및 서버의 구현구조, 응용 프로세스 간 제어 메시지 등 구현의 세부 내용을 기술하였다. 본 구현의 세부 내용은 차세대 인터넷 프로토콜(IPv6)을 지원할 수 있도록 쉽게 수정 보완될 수 있으므로 IPv6용 가정용 정보가전기기 제어시스템의 개발에 쉽게 적용될 수 있다.

• Proceedings of the KIEE Conference
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• 2003.11b
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• pp.159-162
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• 2003

In this paper, we present a middleware that using routing scheme that support easily for various type of network in a home network based heterogeneous network. The protocol presented in this paper, consist two layers that Network Adaptation Layer(NAL) to allow access varience networks and Network Interface Layer(NIL) to deal network dependent parts. The middleware presentedl in this paper, can easily send data to any digital appliance or receive data from any digital appliance by using our routing scheme.