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ORGMA: Reliable opportunistic routing with gradient forwarding for MANETs
Kang, Daeho,Kim, Hyung-Sin,Joo, Changhee,Bahk, Saewoong Elsevier 2018 COMPUTER NETWORKS - Vol.131 No.-
<P><B>Abstract</B></P> <P>For decades, numerous routing protocols have been designed to serve unicast traffic in wireless ad hoc networks. However, these routing protocols still provide limited performance in dynamic environments of mobile ad hoc networks (MANETs). In this paper, we review representative routing protocols and evaluate their performance through NS-3 simulations to identify their main weaknesses. Based on our observations, we develop a reliable and practical opportunistic routing protocol for MANETs, named as <I>ORGMA</I>. We adopt the gradient forwarding approach, where the sender simply broadcasts a packet and the receivers make the routing decision. Our contributions include the use of instantaneous signal-to-noise ratio (SNR) for the routing cost and the development of light-weight cost management based on flooding. They enable <I>ORGMA</I> to achieve high packet delivery ratio under dynamic MANET environments. Through NS-3 simulations, we evaluate <I>ORGMA</I> in comparison with other routing schemes, and the results show that <I>ORGMA</I> not only greatly outperforms the state-of-the-art routing schemes, but also achieves the performance close to an ideal routing scheme with global information.</P>
PASSIVE DESIGN GUIDELINES FOR KOREA AND GERMANY
Kang, Daeho 전주대학교 공학연구소 1997 전주대학교 공학기술종합연구소 학술논문집 Vol.3 No.3
A simplified simulation computer program based on Solar Load Ratio (SLR) method (J.D. Balcomb, 1984) was used to analyze monthly and annual solar savings for heating energy of 94 cases representing a variety of direct gain, trombe wall, and sunspace systems in 4 represetative areas under typical weather conditions in Korea and Germany. Using the results of the analytical modelling that a certain type of passive system could be applied effectively under a certain type of weather condition, the designer can choose or combine the effective systems during the schematic design and design development phases of a building condering the thermal performance guidelines.
Application of Design Techniques of Korean Traditional Architecture
Kang, Daeho 전주대학교 공학연구소 1997 전주대학교 공학기술종합연구소 학술논문집 Vol.3 No.3
The present study aims at investigating some application methodology of the design techniques of Korean traditional architecture to a modern house in suburban area in Korea. The various kinds of traditional buildings such as palaces, temples, houses and some conserved old villages in Korea have been surveyed and analyzed with the aspect of principles of vernacutar architecture, which has been adapted for a long period to the Korean people's life style and to the natural environments, such as weather conditon, available resources of local materials, etc. An actual project was conducted by designing and building a private house as an application of the design techniques of Korean traditional building.
Traditional Passive Building Design and Planning in Korea
Kang, Daeho 전주대학교 공학연구소 1996 전주대학교 공학기술종합연구소 학술논문집 Vol.2 No.2
The traditional architecture has been known to indicate distint vernacular characteristics and indigenous solution of buildings, which has been adapted for a long period to the natural environments, such as weather condition, available resources of local materials, etc. The present study aims at developing an architectural design and planning methodology to apply Korean old traditional architectural design and planning principles for the modern architecture. The traditional buildings such as palaces, temples, houses and some conserved old villages in Korea have been surveyed and analyzed with the aspect of passive approach of building design and planning. Site plans, forms of plans, elevations, eaves of roof for shading and materials of construction have been discussed.
Architectural Space Analysis of Taliesin West
Kang, Daeho 전주대학교 공학기술종합연구소 2002 전주대학교 공학기술종합연구소 학술논문집 Vol.8 No.1
The Taliesin West, Phoenix, Arizona, U.S.A., designed, constructed, and occupied by the architect: Frank Lloyd Wright, has known to be one of the most representative works as an architectural experiment including the design of outdoor spaces for the relationship of each buildings. The study aims at providing basic research materials for architectural space by reviewing and analyzing outdoor spaces in Taliesin West. The spaces were surveyed and investigated with the architectural aspects: site plan, block plan, circulations, outdoor spaces, and the specific devices for spatial transition, designed for outdoor spaces. For analytic approach, some specific architectural concepts in the Taliesin West were recognized and applied: the concept of 'bolt/nut device' of setting to control spatial flow by tying up and separating the individually distinctive outdoor spaces belong to major buildings. The result shows that all the building and outdoor spaces have been designed and set with special intention to control outdoor spatial flows in the site.
LC-HRMS 기반의 표적, 추정 및 비표적 분석기법을 활용한 우포늪 수계 내 미량오염물질 분석
강대호 ( Daeho Kang ),전준호 ( Junho Jeon ) 한국환경분석학회 2018 환경분석과 독성보건 Vol.21 No.2
Upo Wetland, in Changnyeong-gun, Gyeongsangnam-do, is the largest inland wetland in Korea and a habitat for various species. However, due to agricultural activities in the surrounding area, diverse organic pollutants such as pesticides have flowed into the wetland ecosystem. This study analyzed the exposure of Upo wetland to organic pollutants (e.g., pesticides and pharmaceuticals) using LC-HRMS (Liquid Chromatography-High Resolution Mass Spectrometry). Twenty-six pesticides and pharmaceuticals were selected and quantitatively analyzed for target screening. As a result, eight pharmaceuticals (e.g., fluconazole, lincomycin, metformin, valsartan) and eight pesticides (e.g., tebuconazole, metalaxyl) were quantitatively identified. The major pesticides were tebuconazole (230-3,900 ng/L) and metalaxyl (53-980 ng/L), whereas metformin (20-220 ng/L) was the pharmaceutical with the widest concentration range. Metabolites of the two major pesticides TEB_M324c and metalaxyl acid were identified tentatively via suspect and nontarget screening which also identified several other substances including benzotriazole, carbendazim, diazinon, hexaconazole, methabenzthiazuron, tricyclazole, niflumic acid, 2-aminobenzimidazole, 2-isopropyl-6-methyl-4-pyrimidinol, valsartan acid, and retrorsine.