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여가활동참여에 있어서 제약유형의 위계적 과정에 관한 연구
김유일,강석희 한국조경학회 2000 韓國造景學會誌 Vol.28 No.1
Leisure constraints mean the factor to constrain individual's leisure activity. Leisure constraints are composed of interpersonal constraints, interpersonal constraints and structural constraints. The purposes of this study are to show that intrapersonal leisure constraints have a strong effect on leisure preference, and leisure constraints are sequential and hierachical process. Intrapersonal constraints effect on leisure constraints in first step. And then interpersonal constraints and structural constraints effect on leisure participation. Those three leisure constraints are all linked together and come out step by step. Regarding adults as a population, who are more than 20-year-old and live in Seoul, 9 dongs were chose after dividing into upper and lower classes according to the value of their residence. The questionnaire consists of 4 parts: intrapersonal constraints, interpersonal constraints, structural constraints, and demographic characteristics. Results of this paper is that people who have strong intrapersonal constraints normally have problems caused from social structure. Intrapersonal constraints and structural constrains come out not seperately but together. Then, it can be said that structural constraints have an influence over intrapersonal constraints. So, it's necessary to solve structural problems to increase preferences and participations of them.
분석 문맥 조절 기법을 이용한 버퍼 오버플로우 분석의 중복 경보 제거
김유일(Youil Kim),한환수(Hwansoo Han) 한국정보과학회 2010 정보과학회논문지 : 소프트웨어 및 응용 Vol.37 No.12
버퍼 오버플로우 취약점을 검출하는 정적 분석 도구에서, 분석 문맥을 조절하는 방법을 통해, 동일한 원인에 의해 발생하는 중복 경보 메시지를 제거하는 방법을 제안한다. 동일한 원인에 의해 다수의 경보 메시지가 출력되는 경우, 첫 경보 메시지만 살펴보아도 나머지 경보 메시지들에 대한 판단을 내릴 수 있으므로, 사용자에게 첫 경보 메시지만을 보여주는 것이 보다 바람직하다. 제안하는 분석 문맥 조절기법은 기존의 정적 분석 도구에 쉽게 적용할 수 있고, 오픈 소스 소프트웨어를 사용한 실험에서 평균 23%의 경보 메시지를 제거할 수 있었다. In order to reduce the efforts to inspect the reported alarms from a static buffer overflow analyzer, we present an effective method to filter out redundant alarms. In the static analysis, a sequence of multiple alarms are frequently found due to the same cause in the code. In such a case, it is sufficient and reasonable for programmers to examine the first alarm instead of the entire alarms in the same sequence. Based on this observation, we devise a buffer overflow analysis that filters out redundant alarms with our context refinement technique. Our experiment with several open source programs shows that our method reduces the reported alarms by 23% on average.
김유일,전진성,한환수 한국정보과학회 프로그래밍언어연구회 2005 프로그래밍언어논문지 Vol.19 No.2
C 언어로 작성된 소스 코드를 분석하여 버퍼 오버런 취약점을 실행 전에 발견하는 효율적인 정적 분석 도구를 개발하는 과정에서, 속도와 정확도라는 두 가지 상충하는 요구 사항을 모두 만족시키기 위한 분석기의 구조를 제안하고, 현재까지의 실험 결과를 소개한다. 제안하는 분석기의 구조는 포인터 분석과 값 분석을 별도의 단계로 구분하여 정확도를 다르게 설정할 수 있는 구조로, 리녹스 커널 소스에 대해서는 부정확한 포인터 분석과 정확한 값 분석의 조합이 정확한 포인터 분석과 정확한 값 분석의 조합에 비해 빠른 속도로 수행되면서도 정확도 면에서 비슷하다는 실험 결과를 통해 이러한 구조의 가능성을 보인다.
터빈엔진시험을 통한 제트연료 변경에 따른 엔진성능 변화 연구
김유일(Youil Kim),민성기(Seongki Min) 한국추진공학회 2011 한국추진공학회지 Vol.15 No.2
The engine ground and altitude tests were carried out to investigate the effect of jet fuel alteration on the performance of a small turbojet engine. JP-S was supplied 8% higher than JP-8 by fuel metering system at the same command. The employment of JP-S showed the similar starting characteristic to that of JP-8, however, difference in the ignition time and acceleration rate of engine speed due to the difference of fuel flow rate by fuel metering system was observed. In spite of jet fuel alteration, the test results yield the similar steady-state engine performance in net thrust, air flow, exhaust gas temperature, etc. On the other hand, the fuel consumption of JP-S increased by 5 % compared with that of JP-8. In point of specific fuel consumption (SFC), SFC of JP-S was approximately 1.1~2.6 %, 5 % higher than that of JP-8 in ground and altitude tests respectively at the same thrust.
김유일(YouIl Kim),황기영(KiYoung Hwang) 한국추진공학회 2013 한국추진공학회지 Vol.17 No.1
A prestudy on expendable turbine engine for high-speed vehicle was conducted. After two possible mission profiles were established to decide the engine requirements, design point analysis was performed with the values of design parameter which were obtained from similar class engines, references, etc. The results showed that specific net thrust and specific fuel consumption with turbine inlet temperature of 3,600 R are 2,599.4 ft/s and 1.483 lb/(lb*h) respectively at the flight condition of sea level, Mach 1.2. It was also found that major design parameters for determining maximum net thrust were turbine inlet temperature for low supersonic and transonic flight speed and compressor exit temperature for high supersonic flight speed from the results of performance analysis on the two possible mission profiles. In addition, simple turbojet engine with an axial compressor, a straight annular combustor, an one stage axial turbine and a fixed throat area converge-diverge exhaust nozzle was proposed as the configuration of simple low cost lightweight turbine engine.
김유일,전유철,강중규,한종만,한민구 대한용접접합학회 2000 대한용접·접합학회지 Vol.18 No.5
Fatigue crack propagation life of weld toe crack through residual stress field was estimated with Elber's crack concept. Propagation of weld toe crack is heavily influenced by residual stress caused by welding process, so it is essential to take into account the effect of residual stress on the propagation life of weld toe crack. Fatigue crack at transverse and longitudinal weld toe was studied respectively, which represent typical weld joint in ship structure. Numerical and experimental studies are performed for both cases. Residual stress near weldment was estimated through nonlinear thermo-elasto-plastic finite element method, and residual stress intensity factor with Glinka's weight function method. Effective stress intensity factor was calculated with Newman-Forman-de Koning-Henriksen equation which is based on Dugdale strip yield model in estimating crack closure level U at different stress ratio. Calculated crack propagation life coincided well with experimental results.
분당시범단지 초고층.고층.저층단지의 옥외환경평가 : 현대아파트 단지를 중심으로
김유일,함지현,강석희 한국조경학회 1999 韓國造景學會誌 Vol.27 No.2
The survey site, the Hyundai Apartment Complex in the Bundang Model Complex, includes three housing layout types; super high-rise, high-rise and low-rise apartment buildings. The site includes artificial ground over underground parking lots. The overall objective of this study is to evaluate social and physical factors of housing environments in each types of layout. The data has been complied from residents of apartment through questionnaire. The questionnaire include elements of neighborhood, outdoor space, parking zones, and the overall complex design in each layout types. The predictors of outdoor space satisfaction in apartment housing complex are found as follows: "abundance of trees in quantity", "the role as front yards", "harmony of buildings with landscape", "the more distance between buildings" and "maintenance quality of site". Layout of super high-rise apartment site is most satisfied. Introduction of car-free deck space is favored by resident because of safty and quiet resting area. However the low quality of green and lack of shades on the artificial land are identified as problems.on the artificial land are identified as problems.