• Information and Communications Magazine
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• v.14 no.3
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• pp.109-123
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• 1997

• Fiber Technology and Industry
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• v.2 no.3
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• pp.333-347
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• 1998

• Journal of Korean Electronics
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• v.4 no.4
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• pp.88-96
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• 1984

• Proceedings of the KIEE Conference
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• 1998.11b
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• pp.572-574
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• 1998

In this paper, we are proposed design of ATM networks to transfer for electric power system informations, proposed transport networks is partitioned management part and functional part, management part is partitioned edge network, core network, local network, authority network, functional part is partitioned core network, access network, edge area. It is based on laying and partitioning by ITU-T G.805, we also proposed ATM network requirements for Carrier Relay traffic acceptability in electric power system information.

• Proceedings of the Korea Technology Innovation Society Conference
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• 2000.11a
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• pp.45-67
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• 2000

Broadband access technologies plays an important role in the national information infrastructure. In the evolution path of the information infrastructure, the relative economics of alternative access technology is the most critical determining factor. In this paper, we discuss the economics of local loop access technologies of existing technologies, such as, ADSL, HFC, and new PLC. To do this, we suggest appropriate configuration of access network system and its associated numerical equations. To modelize access network system and drive the numerical equations, we consider the DS (Double Star) and the T&B (Tree ＆ Brench) architecture and analyse the adequate block diagram of each access system for each technology We introduce the density of subscriber as a key variable and the equation of allocating optimal number of cell in a service area. We analyze the relative economics of local loop architecture in two different situations, that is, urban and rural. From the empirical implementation, we found that for the case of urban area, where the cost of cable and infrastructure is not necessary, there is not much difference in the cost per one subscriber. However, for the case of rural region, we found that there is remarkable difference in the cost per one subscriber among technologies. Therefore we conclude that the economics of local loop architecture is depend on the density of subscriber and existing network infrastructures. we hope that this paper contribute to the optimal technology selection of consmer, technology Providers, and government.

• Journal of the Korean Society of Environmental Restoration Technology
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• v.13 no.5
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• pp.154-171
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• 2010

This study was performed to show criteria of a National Ecological Network (NEN) for South Korea and it was a part of a study of ecological network for broad areas on national land showed by Ministry of Environment of Korea. After 1970s, many european countries presented methods and criteria not on individual protected area but on networking among many habitats. The PEEN (Pan European Ecological Network) and NATURA 2000 are results of those. In South Korea, concepts and mapping metheods of ecological network was studied but those were not applied to the whole national land because the equality and local specialities were not reflected. So, in this study, we presented the criteria composed of forest, river, wildlife and coastal evaluation items in conservation ecology and showed the mapping method which can applied to the national land. After the evaluation on land area which composed of forest, river and wildlife axis. Core areas were $30,616km^2$, buffer zone were $21,870km^2$ and each accounted for 31% and 22% of the national land. Except for Taebaeck-Gangwon region, whole region's core areas were accounted for 20~30% of it and buffer zone were accounted for 20~25% of it, so these can be applied to the national land with equality and local specialities. Forest axis and river axis were clearly linear and connected, but the wildlife axis was dispersed in point form. Therefore, to apply the NEN, a detailed habitat map is important and the interconnected implementation of forest, river, wildlife, and coastal axis is required.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.5 no.4
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• pp.626-648
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• 2011

Energy consumption of wireless access networks is in permanent increase, which necessitates development of more energy-efficient network management approaches. Such management schemes must result with adaptation of network energy consumption in accordance with daily variations in user activity. In this paper, we consider possible energy savings of wireless local area networks (WLANs) through development of a few integer linear programming (ILP) models. Effectiveness of ILP models providing energy-efficient management of network resources have been tested on several WLAN instances of different sizes. To cope with the problem of high computational time characteristic for some ILP models, we further develop several heuristic algorithms that are based on greedy methods and local search. Although heuristics obtains somewhat higher results of energy consumption in comparison with the ones of corresponding ILP models, heuristic algorithms ensures minimization of network energy consumption in an amount of time that is acceptable for practical implementations. This confirms that network management algorithms will play a significant role in practical realization of future energy-efficient network management systems.

• The Magazine of the IEIE
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• v.29 no.2
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• pp.25-34
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• 2002

무선통신 및 센서 분야의 수요 증가로 관심이 확대되고 있는 밀리파 무선서비스용 MMIC (Monolithic Microwave Integrated Circuit) 기술동향 및 설계에 대하여 기술한다. 밀리파 무선서비스로는 자동차 레이다, HDR(High Data Rate)무선 LAN(Local Area Network), LMDS(Local Multipoint Distribution Service)등이 있다. 이런 서비스에 필요한 MMIC는 저렴하고 고집적율을 가지며 고성능이고, 새롭게 등장하는 서비스로의 설계 변경이 용이하여야 한다. 본 논문에서는 이를 위한 MMIC 동향과 설계기술을 논한다.

• Journal of the Korean Institute of Rural Architecture
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• v.10 no.4
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• pp.41-48
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• 2008

Recently, Rural village of japan are enlarging and enriching the service of health, medical and welfare facilities for the elderly. Concentrated arrangement of the three types of facilities is one of the effective ways especially for the small-scale local governments. This paper focus on a questionnaire survey of employees who work in the facilities to evaluate service network. Using this survey data, it is used to make a plan of intensive arrangement. As a result, their satisfaction with concentrated arrangement was considerable high. In particular, they expressed satisfaction with service network between Medical and Welfare. Due to increasing outpatients, the concentrated arrangement has contributed to hospital funds and given emotional security to the aged in welfare facilities. In order to promote service network effect, there are many opinions that management of health facilities(local governments) is needed.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.17 no.8
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• pp.823-836
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• 1992

Computer and communication network of the future will be the ISDN that enable various services. And now, it Is very Important to study the relevalent techniques to develop Interworking methods between existing computer network and ISDN The purpose of this paper Is to provide necessary basic He search results on the Interworkting method between local area network (LAN) and ISDN. For Interworking, we analyze the characteristic of existing LAN and ISDN and discuss considerations of Interworking and suggest the interworking method for CO and CL services. Also. we construct logical gateway for Interworking betwen LAN and ISDN and make formairnodeling of gateway using Petri net and verify the correctness of protocol with reachability tree. Research results should be helpful In designing and Implementing gateway between i()cal computer network and I SDN