UML을 이용한 3-Tier 환경에서의 p2p 시스템 설계

이승아,권영직 한국의사결정학회 2002 경영과학연구 Vol.11 No.-

인터넷의 발전은 사용자들의 정보에 대한 요구를 급속히 증가시키고 있으며, 고급 정보 획득을 위한 사용료에 대한 부담도 함께 증가하고 있다. 따라서 사용자 각자가 보유한 정보들을 다른 사용자들에게 오픈 시켜 공유할 수 있도록 하는 시스템의 개발에 대한 요구가 발생하게 되었다. 이러한 요구에 맞추어 본 논문에서는 네티즌들이 서로의 컴퓨터에 접속하여 상대방이 가진 정보들을 검색하고 공유할 수 있는 p2p(peer to peer) 시스템인 「p2p-3」을 제안하게 되었다. 「p2p-3」시스템은 객체지향설계 기법인 UML을 이용하여 개발함으로써 시스템 구현의 효율성을 추구하였다. 또한 일반적인 p2p 시스템의 문제점으로 대두된 보안문제를 해결하기 위하여 3-tier 분산시스템을 이용하였다.

아스코르브산등 킬레이트제가 鐵吸收에 미치는 영향

李相稷,崔承熙 嶺南大學校府設 基礎科學硏究所 1983 基礎科學硏究 Vol.3 No.-

Serum iron concentrations of rats which took sirupy diets dissolving substantial amount of ferrous ion and chelating agents including ascorbic acid were determined. Ascorbic acid-fed rats showed elevated level of serum iron, i.e. elevated absorption of iron as reported previously in many papers, but not all the chelating agents improved the absorption of iron. Whether or not chelating capacity of ascorbic acid for the ferrous ion contribute to the absorption of the ion remains to be answered.

기하학적 형태의 옥상 녹화 시스템에 관한 연구

서승직,이충국,최원기 대한건축학회 2003 대한건축학회논문집 Vol.19 No.10

Modern cities are confronted with a serious environmental damages such as destruction of ecosystem and climate change resulting from rapid urbanization. It has been reported that the rooftop planting system (or tree planting around a building) could solve the problems relating to greenhouse effect, energy-resource depletion, air pollution, urban inundations and underground water as well as restoration of environmentally-friendly cities. Therefore, we attempted to apply a new roof planting system, which is a geometrical shape on the rooftop system. In this paper, experimental study has been performed during the summer and the winter through the five different types of roof planting models. As a result, this experiment shows that the geometrical shape is better than existing rooftop plane of system performance. Especially, we verified that new roof planting system with furrow shape have the advantage to previous predicted problems, namely, soil weight, surface, thermal performance, drainage, isolation and evaporation of soil. Finally, additional studies are required to the considerable factors for practical use.

壁 附着型 自然 換氣 시스템의 性能 分析

장용성,서승직,박효순 대한건축학회 2004 대한건축학회논문집 Vol.20 No.6

A mathematical model of a natural ventilation system by solar chimney effect equipped with south wall was proposed in order to predict its performance under varying climates(summer and winter). Unsteady state heat transfer equations were set up using a energy balanced equation and solved using Gauss-Seidel iteration solution procedure. The ventilation performance of the solar chimney as determined from the air gap, outlet temperature, mass flow rate, ventilation rate according to the system height and instantaneous heat collection efficiency of the solar chimney are examined. As a result, this numerical study shows that system efficiency of winter mode is better than summer mode. Satisfactory correlation was obtained with theoretical and numerical analysis data. Further experimental study is required to establish complete system.

건물의 외피부하 제어를 위한 다목적 열교환 시스템에 관한 연구 : 여름철 운영 모드를 중심으로 Focused on the Summer mode

최원기,서승직 대한건축학회 2003 대한건축학회논문집 Vol.19 No.11

The authors carried out a study on the application of Building Integrated Solar System(hereafter referred to as BISS), which is functioned as solar collector/heat exchanger on the exterior wall of building with thermal control chamber for instance. The BISS can be controlled heating mode in winter and cooling mode in summer according to the climate conditions. Previous studies have dealt with the system of performance and efficiency in winter by numerical method. In this study, BISS was analysed and presented as a solution for skin load control system in summer mode. As a result of this study, cooling mode can indeed perform better than heating mode of system performance. Especially, we verified that BISS could be covered to 2m of building exterior zone in cooling load. Finally, parameters and experimental studies are required to establish the complete system of design pattern and control method on the basis this study.

독립형 외부차양장치의 형태계수에 관한 평가

최원기,서승직 대한건축학회 2004 대한건축학회논문집 Vol.20 No.4

This study aims to develop a new shading device system which is separated installation from the building. We called this system a Separated Exterior Shading Device(hereafter referred to as SESD). In this paper, a new calculation method of configuration factors was proposed and analyzed. Many calculation methods of configuration factors have been developed for the computation of thermal radiation heat transfer between two surfaces. But we developed a new computer programs for numerical calculation of configuration factors. The calculation of configuration factors for the various geometries of SESD was carried out by new computer programs. In this case study, configuration factors are varied according to between two surfaces for examples, building height and length, sunscreen width and height, etc. We verified the new calculation method can be adapted for the complex geometry of configuration factors. The new calculation method of configuration factors is very simple and exact.

숯을 이용한 건축재료 개발을 위한 기초적 연구

최원기,박혜란,서승직 대한건축학회 2004 대한건축학회논문집 Vol.20 No.3

In recent years, consmners have a growing interest in green building materials. Why do they use green bui1ding materials? The reasons why they use green building materials are those that earn hiP marks for resource management, impact on indoor environmental quality(IEQ) and performance(energy efficiency and water efficiency, etc). The purpose of this paper is to develop the High Functional Multi-Purpose Green Panel(hereafter referred to as Hi-FMPGP) using the charcoal having the characteristics of porous, absorbent and. moisture control effect In this paper, experimental studies have been performed through the four different models according to the charcoal content. As a result, this experiment shows that the model No.3 with lots of charcoal content is better than reference model without the charcoal content to the all performance. Consequently, we verified that the new Hi-FMPGP has the advantage to previously predicted performances, namely, water content ratio, surface evaporation rate, surface temperature, time lag effect and emissivity. Therefore, Hi-FMPGP is quite within the realms of possibility as a green building material. Finally, additional studies should be performed on the basis of these experimental results for complete green building materials.

건물의 에너지 효율을 위한 건축적 계획 방법 연구 : 자연실온과 환경 디자인 요소의 상관도 분석을 중심으로 Focused on Correlation Analysis of NART and Environmental Design Factors

장용성,이현수,서승직,박효순 대한건축학회 2005 대한건축학회논문집 Vol.21 No.2

This study intends to deriving the equation of non-airconditioned room temperature(hereafter referred to as NART) prediction from the correlation analysis of the influence of environmental design factors on the building. The relation between the NART and environmental design factors was analysed by using correlation coefficients. The equation of NART prediction was derived from the regression analysis by experimentation and simulation. In this study, the main results are summarized as follows: The average NART of experiment and simulation were evaluated to 22.0℃ and 22.6℃, respectively. An error of simulation was the 2.7%. The results from correlation analysis was con-elated with the daily average outdoor temperature, soil temperature, solar intensity, relative humidity, and air velocity in order. Con-elation coefficients of the daily average outdoor temperature, NART, and peak air conditioning load were over the 0.75. According to the sensitivity analysis of environmental design factors and air conditioning load in reference model, the influence of air infiltration and window surface ratio were more than outside insultion.

단독주택의 에너지효율 등급설정 및 인증기준(안) 연구

장용성,홍성희,박효순,서승직 대한건축학회 2004 대한건축학회논문집 Vol.20 No.12

This study aimed to make out certification criterion and establishment of the energy efficiency rating of a detached house To this end, we surveyed the energy consumption and plan type of a existing detached house And we also set a reference house throughout a investigation data and developed simple energy analysis software program for a energy performance evaluation of a detached house A energy efficiency rating of a detached house was established by a comparison and analysis of heating energy simulation result according to variation of the U-value of a window and construction, ratio of a window area, setting temperature of a room and air change of rate

오존 발생기용 전원장치 개발 및 특성에 관한 연구

김동희,이달해,성현직,오승훈,이봉섭,배상준 嶺南大學校 工業技術硏究所 1997 工業技術硏究所論文集 Vol.25 No.1

The power semiconductor switching devices(PSSD) continuously developed, Power Electronic Technology using PSSD is gradually extended. The high frequency inverter to generate the large power high frequency subject to power electronic technology pursuit various application. Also, in emboss with environmental destruction problem cause the atmosphere and the water pollution to growth of the commercial society, the research in favor of cleansing environmental a pollutant actively proceed. Cause of having a strong oxygenization in the physical world, the ozone has sterillization effect predominantly against virus, bacteria, etc and has application in decolorization, deodorization, food storage and air cleansing and has a merit that does not cause the secondary pollution by being restored to oxygen lastly. Therefore, This project describe study on the ozone generation power supply using the high frequency electric field method and the lamp type ozone generator using photochemistry, one of method of generate ozone.