탄화수소계 냉매의 증발 압력강하 특성에 관한 실험적 연구

이광배,이호생,김재돌,윤정인,Lee Kwang-Bae,Lee Ho-Saeng,Kim Jae-Dol,Yoon Jung-In 한국마린엔지니어링학회 2005 한국마린엔지니어링학회지 Vol.29 No.5

Experimental results are presented for heat transfer and pressure gradients of HCs refrigerants R-290, R-600a, R-1270 and HCFC refrigerant R-22 during evaporating inside horizontal double pipe heat exchangers. Two tubes with a tube diameter of 12.70mm and 9.52mm are used for this investigation. Hydrocarbon refrigerants have higher pressure drop than R-22 in 12.7mm and 9.52mm. The results from the investigation can be used in the design of heat transfer exchangers using hydrocarbons as the refrigerant for the air-conditioning systems.

단방향 링크를 지원하는 이동 Ad Hoc 라우팅 프로토콜

이광배,김현유,정근원,Lee, Kwang-Bae,Kim, Hyun-Ug,Jung, Kun-Won 한국전기전자학회 2001 전기전자학회논문지 Vol.5 No.1

본 논문에서는 단방향 링크를 포함하는 이동 Ad Hoc 망에 대해 비대칭 경로를 지원하는 동적 소스 라우팅 프로토콜을 제안하였다. 기존의 동적 소스 라우팅 프로토콜은 양방향 링크로 구성된 대칭경로만을 지원하도록 구현되어있다. 그러나 실제적인 무선환경에서는 단말의 비대칭성이나 무선환경 특성등에 기인한 단방향 링크가 존재할 수 있다. 따라서 본 논문에서는 좀 더 일반적인 무선환경에 맞는 이동 Ad Hoc 망 라우팅 프로토콜을 구현하기 위하여 단방향 링크를 지원하도록 하였다. 특히 이동성으로 인한 경로 실패를 인식한 경우, 신속한 경로 재설정을 수행하기 위해 다중경로유지 기법을 사용하였다. 성능평가는 평균 경로설정시간 및 평균 데이터수신율에 대해 수행하였으며, 그 값을 얻기 위해 경로 상에 중간노드캐쉬의 사용여부 및 서로 다른 이동성과 연결성을 제공하는 시나리오를 고려하여, 100초 단위로 900초까지 성능평가를 수행하였다. In this paper, we propose a dynamic source routing protocol supporting asymmetric paths for mobile Ad Hoc networks that contain unidirectional links. At present, the existing dynamic source routing protocol supports only symmetric paths that consist of bidirectional links for routing. However, in fact, there can exist unidirectional links due to asymmetric property of mobile terminals or current wireless environment. Thus, we implement a mobile Ad Hoc routing protocol supporting unidirectional links, which is fit for more general wireless environment. Especially, the proposed protocol uses an improved multipath maintenance method in order to perform rapid route reconfiguration when route error due to mobility is detected. For performance evaluation, we consider the following factors: average route discovery time and average data reception rate. In order to obtain the factors of the performance evaluation, we did simulation for 900 seconds in the step of 100 seconds with the following scenarios: usage of route cache in intermediate nodes on route path, and different mobility/connection patterns.

이종접합 SrBi2Ta2O9 / Pb ( Zr , Ti ) O3 박막 케패시터의 강유전 특성

이광배,김종탁 ( Kwang Bae Lee,Chong Tak Kim ) 한국전기전자재료학회 1997 한국전기전자재료학회 춘계학술대회논문집 Vol.1997 No.0

양방향 링크를 지원하는 이동 Ad Hoc 망에 대한 개선된 DSR 라우팅 프로토콜

이광배,김현욱,곽승욱,Lee, Kwang-Bae,Kim, Hyun-Ug,Kwag, Seung-Ug 한국전기전자학회 2001 전기전자학회논문지 Vol.5 No.1

본 논문은 기존 DSR 알고리즘의 경로에러 발견 시 경로 복구 처리과정을 개선하기 위한 방법을 제안한다. 이동 Ad Hoc 망에서는 이동 노드들 자체가 라우터의 기능을 가지기 때문에 두 이동 노드들 간에 경로설정을 위해 잘 정의된 라우팅 프로토콜이 필수적이다. 그러나 기존의 DSR 라우팅 프로토콜은 경로에러 발생 시, 복구 지연으로 인해 패킷이 폐기되는 문제점을 갖고 있다. 그 문제점을 개선하기 위해서 본 논문에서는 경로에러 복구시간을 단축할 수 있도록 개선된 DSR 프로토콜을 제안하고 시뮬레이션을 통해 평가하였다. 평가 결과, 제안한 DSR 프로토콜은 기존의 DSR 프로토콜에 비해 시나리오에 따라 대략 4배에서 30배 빠른 경로에러복구 시간을 제공함을 확인하였다. In this paper, we propose a new method to improve tile processing of route recovery of the existing DSR algorithm on detection of route error. In mobile ad hoc networks, mobile nodes themselves have routing capability. Thus, a well-defined routing protocol is required for route set-up between two mobile nodes. However, the existing DSR routing protocol has problem with dropping of packets due to the recovery delay when a route error occurs. In order to alleviate tile problem, we propose an enhanced DSR protocol to reduce the route error recovery tine and evaluate the protocol through simulation. As tile result of evaluation, we found the proposed DSR protocol provided about 4 to 30 times faster route error recovery time according to the test scenario than the existing DSR protocol.

한국 현대건축에 있어서의 전통건축언어의 재해석

이광배(Lee Kwang-Bae),조종수(Cho Jong-Soo) 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2

The study of Korean traditional languages in architecture has been discussed from the 1960's during the past 40 years, many buildings considering architectural traditional have been constructed Many contemporary buildings which tried to consider the form of traditional character has been only imitated. The purpose of this study is to analyze characteristics of Korean traditional architecture, and it will present the desirable ways to express the strategy of Korean traditional feature in contemporary architectural elements.

e-Marketplaces를 통한 물류서비스 성과에 관한 연구

이광배(Kwang-Bae Lee),김명수(Myung-soo Kim) 한국항만경제학회 2005 韓國港灣經濟學會誌 Vol.21 No.4

Although logistics service quality is considered an essential strategy for success and survival in today's internet environment, there are still a lot of question: what variables determine the extent of logistics service effect, how difficultly do the determinants affecting logistics service effect and how accomplish the decision making in the implementation of inter-organization information system. The purpose of this study is to examine a model to utilize the application and effect of logistics service through e-marketplaces.<br/> The results of empirical analysis are mentioned as follows; First, among the interorganization information system factors, four variables(top management support in organization characters, competitive degree in environment characters, relative advantage and information efficiency in innovation characters) have been shown to be primary determinant of the effect of logistics service quality. Second, the type of independent variable used results in a significant difference in the effect of logistics service quality. Third, Korean firms have to pursue the corporate strategy focused on logistics service quality.

탄화수소계 냉매의 증발 압력강하에 관한 연구

이광배(Lee Kwang Bae),이호생(Lee Ho Saeng),문춘근(Moon Choon-Geun),김재돌(Kim Jae-Dol),윤정인(Yoon Jung-In) 한국에너지학회 2004 한국에너지공학회 학술발표회 Vol.2004 No.-

Meloidogyne incognita 알을 제어하는 Paecilomyces lilacinus의 현미경적 관찰

이광배(Kwang-Bae Lee) 대한환경위생공학회 2007 대한환경위생공학회지 Vol.22 No.3

M. incognita are plant-parasite nematode that cause severe damage to the crops. P.lilacinus are renowned for inhibitation of development of M.incognita's egg. We make a study for enzymatic examining the cause closely that P.liacinus suppress development of M.incognita's egg by parasiting. The research result is explained the place below. l. The egg that is exposed to co-enzymes which are cultured in the broth culture starts to change the membrane of egg from 3days. And in 10days, that membrane completely disappear. These are observed through light microscope. Therefore, we know that M.incongnita are controlled by extracellular lytic enzymes taat are produced by P. lilacinus. 2. Through scanning electron microscope, we can find that the egg that is attacked by P.ilacinus loses it's membrane gradually, and that loss of the membrane causes transform, which suppresses the development of egg.

流通情報시스템의 成果에 影響을 미치는 變數에 관한 硏究-流通業의 保管시스템을 중심으로-

이광배(Kwang-bae Lee) 한국항만경제학회 1999 韓國港灣經濟學會誌 Vol.15 No.-

The purpose of the research is to empirically examine the performance of distribution information system. To do so, related literature are reviewed, relevant hypotheses are proposed, a comprehensive model is developed to test those hypotheses, and collected data are analyzed.<br/> The results of this study are summarized as follows: in the first stage, the performances of the distribution information system such as operational effectiveness and trade satisfaction are affected by corporation's characteristics and motivation, and by the basic information technology level. In the second, as we analyze the factors affecting distribution performance, operational effectiveness is affect by organizational participation, external sources and original functions. In the third, trade satisfaction is affect by external sources and connecting functions. However, the influence from centralization of the organization have a negative effect on the trade satisfaction.

日本 平等院 梵鍾에 대한 考察

이광배(Lee Kwang-Bae) 동국대학교 박물관 2013 佛敎美術 Vol.24 No.-

There search starts two doubt are a son able content of the term of "The Empty Two Centuries"(空白의 2世紀), which define a bell-less gap from A.D. 977 to 1160 in the generally known Japanese History of Buddhist Bells. Focusingon "The Bell of Byōdō-in"(平等院 梵鐘), well-known to be made right after the end of "The Empty Two Centuries", it is tried to draw near the doubtful era through the analysis of this bell's style and production time. Previously it was just the in vocation, that came along with the term of "The Empty Two Centuries", which caused an eglection of the existence of Buddhist Bells under those without an inscription of date, but having a look on the ornaments and patterns, their existence is a clear fact. That is, why the idea of these two centuries should be reconsidered. In the case of the Buddhist Bell of Byodo-in, the analysis of the shape shows us, that the bell does not fit well into the context of 12th-century-styled bells and tends more to be, with it's three parted design, a product of the time around the year 1053, what would be the Byōdō-in's foundation date. Even if this classification is no proof for an exact production date, it is under the mentioned circumstances questionable, to keep on the 12th century classification. Finally the Buddhist Bell of Byōdō-in as an object of the 12th century became disputable in addtion to the fact, that the making of the bell was accompanied by the creation of statues or new buildings. In all the research shows us that we should be critical with the given issues, dealing not with the categorisation through stylistic devices, about the Buddhist Bell's History. In the future the researchment on the field of the connection and relation between the Japanese and the Korean Buddhist Bells should demand precise, dilligent handling of the given datas.