• Journal of the Korea Society of Computer and Information
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• v.21 no.4
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• pp.25-30
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• 2016

We consider energy efficient transmit and receive strategy for a delay sensitive data. More specifically, we investigate an energy optimum scheduling characteristics for the 2 user interference channel where each user interferes to each other. First, we determine the optimum transmission rate region each individual user may have for optimum transmission. Next, we consider the optimum transmission region of two users together. Shortest path algorithm can be used for further reduction of search space. Eventually, we can reduce computational complexity. We then examine the performance of the optimum transmission strategy for various system environments.

• Proceedings of the KSR Conference
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• 2007.11a
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• pp.1744-1759
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• 2007

This study intended to identify the problems of the railroad which are raised as one of the 21C next-generation but to define the direction for the absence of the national policy and examine the competitiveness of railway transportation which is a Green Network with low environmental destruction and high energy efficiency as the continuable means of transportation for the 21st century with superiority to energy crisis caused by high oil price, conclusion of the Kyoto Protocol for worsened air pollution, and reduced cost of traffic jam.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 1999.10a
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• pp.39-44
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• 1999

우리나라는 1970년 말에 이르기까지도 대기오염의 심각성은 별로 고려되지 않았다. 그 이전에는 공장에서 나오는 시커먼 연기가 산업화의 상징으로 인식되어 있었던 것이 사실이며, 1960년 초의 국민학교 사회교과서에는 검은 연기가 나오는 대구의 공장의 사진에는 공업도시 대구라는 설명이 붙어 있었다. 또한 울산중심가에 1962년 2월 세운 공업탑 아래 울산공업센타 기공식 치사문에는 "공업생산의 검은연기가 대기 속에 뻗어나가는 그날엔 국가민족의 희망과 발전이 눈앞에 도래하였음을 알 수 있는 것입니다". 라고 적혀있다.(중략) 적혀있다.(중략)

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2000.10a
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• pp.21-26
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• 2000

This paper gives a general introduction on the development of Chinese marine aids to navigation. It also briefs some modern technology applied in this field. In the paper, an outlook is described for the development of our marine navaids in the next five-year period.

• Korean Journal of Poultry Science
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• v.31 no.1
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• pp.33-36
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• 2004

Predicting the future is at once both an opportunity and a challenge. Predicting what changes will take place in the poultry industry over the next century is certainly an opportunity to review the past and use this as a means of predicting the future.(omitted)

• 한국디지털정책학회:학술대회논문집
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• 2005.11a
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• pp.281-288
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• 2005

차세대 인터넷 주소체계인 IPv6는 BcN, 디지털홈, 유비쿼터스 컴퓨팅 등 21세기 국가경쟁력을 좌우하는 핵심 인프라로 자리 잡고 있다. 본 논문에서는 차세대 인터넷 프로토콜(IPv6) 개념, 기술현황, 표준화 통향, IPv6의 적용 분야 등에 대하여 검토하기로 한다.

• Polymer Science and Technology
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• v.21 no.1
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• pp.41-44
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• 2010

• Journal of Yeungnam Medical Science
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• v.2 no.1
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• pp.65-69
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• 1985

For evaluation on the histopathologic studies, and age and sex distribution of the gastric carcinomas in the Taegu Area, the gastrectomized and gastoroscopic biopsy materials were collected at the Department of Pathology, College of Medicine, Yeungnam University, and the analyzed results were as follows: 1. In total of 350 cases of gastroscopic biopsy materials adenocarcinomas are 344 cases (98.3%), squamous cell carcinomas and undifferentiated carcinomas are only 6 cases (1.7%). In adenocarcinomas the most of all are tubular type, 215 cases (61.4%). In age distribution the highest is the 50th age group, and 120 cases (34.3%), the next, 60th, 81 cases (23.1%), 40th, 76 cases (21.7%), respectively. 2. In total of 130 cases of gastrectomized materials adenocarcinomas are 127 cases (97.7%), and are the highest incidence, the next, carcinomas originated from chronic peptic ulcer of the stomach, and are 3 cases (2.3%). In adenocarcinomas the highest are tubular type, 86 cases (66.2%), the next, signet-ring cell type, 20 cases (15.4%). The highest age incidence of the age group IS 50th, and the next, 60th, 40th, 30th, 70th and 10th age group, respectively.

• International Journal of Automotive Technology
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• v.8 no.1
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• pp.119-126
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• 2007

Because of the low temperature operation, proton exchange membrane (PEM) fuel cell has a water phase transition. Therefore, water management is an important operation issue in a PEM fuel cell because the liquid water in the fuel cell causes electrode flooding that can lower the cell performance under high current density conditions. In this study, in order to understand the reactant distributions in the cathode channels of the PEM fuel cell, an experimental technique that can measure the species concentrations of reactant gases by using gas chromatograph (GC) is applied for an operating PEM fuel cell. The oxygen distribution along the cathode flow channels of PEM fuel cell is mainly investigated with various operating conditions. Also, the relations between cathode flooding and oxygen concentrations and oxygen consumption pattern along the cathode channel configurations of the unit cell adopted for this study are discussed using GC measurement and visualization experiment of cathode flooding. It is found that the amount of oxygen consumption is very sensitive to various operating conditions of the fuel cell and was much affected by the flooding occurrence in cathode channels.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.20 no.2
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• pp.128-136
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• 2008

It is necessary to estimate the cooling load of the next day for effective control of ice thermal storage system. In this paper, new methodology is proposed to estimate the cooling load using design parameters of building and predicted weather data. Only six input parameters such as sensible heat coefficient and constant, latent heat coefficient and constant, maximum and minimum temperature are necessary to obtain hourly distribution of cooling load for the next day. Two benchmarking buildings(hospital and research institute) are selected to validate the performance of the proposed method, and the estimated cooling loads in hourly and daily bases are calculated and compared with the measured data for E hospital. The estimated results show fairly good agreement with the measured data for both buildings.