화재시 생성된 유독가스로 부터의 안전관리 방안 연구 : CO가스 대책을 중심으로

김병석,최만철,장병집 忠州大學校 2011 한국교통대학교 논문집 Vol.46 No.-

Recently developed a variety of architectural interior decoration according hwadoeme type of toxic gases generated during fire also are becoming diversified, resulting in fatal casualties occurred in the trend is also being increased. During a fire, toxic gas that is generated varies depending on the combustible material occurs. However, all combustible materials, including carbon, incomplete combustion of carbon monoxide which is generated in the most common toxic gases can be seen as one. Accordingly, in this study of organic solids that are generated in case of fire toxic gases, and briefly discuss the characteristics of the risks and, by far the most common CO gas for measures to prevent human casualties, seolbijeok, the temperature dependence, divided into four aspects of administrative daechaekdeung explained. In seeking to study in Korea due to the nature of the atmosphere in the event of casualties caused by fire victims and casualties of the CO-Hb concentration on the human body by measuring a very limited case said the cause of death in Japan had to use a lot of material in well feel the limit, fire, personal injury that occurs when you share the need for a systematic investigation. This study of the toxic gases generated during a fire on CO Gas will use the tools, basic safety measures. The future development of many combustible interior decorations are coming up in front of my eyes. So I accepted geonchukmulnae occur depending on the type of material appropriate safety measures taken by toxic gases, the research also deemed to be concurrent.

한국어 대용량 음성인식에서의 효율적인 시간 감축에 관한 연구

장춘서,이기수,신윤식,임은기,김병만,김현수 금오공과대학교 산업기술개발연구원 2000 産業技術開發硏究 Vol.16 No.-

In this paper a time reduction algorithm for large vocabulary speech recognition system has been studied. TDNN(Time Delay Neural Network) was used to classify vowel using phonetical fetures. To increase performance of vowel classification, modular TDNN architecture associated with 2 states input layer has been suggested.

殘留應力을 考慮한 鎔接材의 疲勞龜裂 進展擧動에 關한 硏究

최병기,이을호,국중민,기준호,임선빈,정장만 朝鮮大學校 機械技術硏究所 2000 機械技術硏究 Vol.3 No.1

The effect of welding residual stress on the initiation and propagation of fatigue crack is investigated so as to study the fatigue behavior in welding residual stress field. Especially, the relation between welding residual stress and fatigue crack opening behavior is investigated and the redistribution of residual stress as a fatigue crack propagates is examined. Following results are obtained. 1) In case of the load range is constant, as the stress ratio is changing to 0.1, 0.33, 0.5 the propagation life is constant but the growth life decreases. And than, when maximum load or minimum load is constant, as the stress ratio increases the growth life and propagation life increase. 2) The fatigue crack propagations rate da/dN appears to accelerate when the stress intensity factor range ΔK is less than 15MPa-m^1/2. 3) The residual stress that is appeared by welding decreases after cutting. 4) Fatigue crack propagation ratio is affected by tensional and compressible residual stress at the initial time, but it's similar to the original in the more than 20mm of crack length.

잔류응력을 고려한 SS400재의 피로특성에 관한 연구

최병희,이종범,정장만,장경천,최병기 朝鮮大學校 機械技術硏究所 2007 機械技術硏究 Vol.10 No.2

In this study is about the fatigue characteristics which appears in the welding residual stress field. The welding residual stress takes place mostly at the portion where SS400 materials are automatical welded. The effects of the welding residual stress in the growth and propagation of fatigue crack, so as to study the fatigue behavior in the welding residual stress field. The results, in case of the load range is constant, as the stress ratio is changing to 0.1, 0.33. 0.5 the propagation life is constant but the growth life decreases. And than, when maximum load or minimum load is constant, as the stress ratio increases the growth life and propagation life increase. The fatigue crack propagations rate da/dN appears to accelerate when the stress intensity factor range △K is less than 15MPa-m^(1/2). The growing and propagation fatigue crack in the welding residual stress field is similar to original specimen after being passed the original residual stress field.

Ti 鎔接材의 機械的 特性 및 疲勞크랙 進展擧動에 關한 硏究

최병기,장경천,정장만 朝鮮大學校 機械技術硏究所 2001 機械技術硏究 Vol.4 No.2

Ti 용접재 시험편을 통하여 용접조건에 따른 기계적 성질 및 피로크랙 진전거동을 각각 비교·검토한 결과 다음과 같은 결론을 얻을 수 있었다. 동일한 용접조건에서 패스 수에 따라 4패스는 7패스와 비교하였을 경우 인장강도가 10%정도 높게 나타났고, 연신율은 30%종도 감소함을 알 수 있었다. 또한 실딩가스량이 많고, 용접 후 자연냉각 시간간격이 길수록 인장강도는 높게 나타났고, 연신율은 감소하였다. 충격 흡수에너지값은 4패스는 7패스에 비해 50%정도 감소하였으나, 실딩가스량이 많을수록 높게 나타났다. 또한 경도값은 패스 수가 적을수록 높게 나타났으며, 용접 후 자연냉각 시간간격에는 비슷하였으나 용접 후 자연냉각 시간간격이 적은 것은 조금 감소하였다. 초기크랙 진전속도는 Bond부, 용착부, HAZ, 온도영향부 순으로 느리게 나타났으나, 피로수명은 Bond부, HAZ부, 용착부, 온도영향부 순으로 높게 나타났다. The purpose of this thesis was to investigate the welding characteristics and the fatigue crack propagation behavior of titanium commonly using power station, aircraft and ship. The experimented material was TIG welded in order to look over the characteristics according to the notch position and compare with other materials. We compared and reviewed the fatigue crack propagation behavior of nonwelded base metal and welded specimens having different notch position to evaluate the fatigue crack propagation behavior by welding condition. The tensile strength and elongation of the 4 pass welded specimens was shown about 10% and 30% higher than those of the 7 pass welded specimens at the same welding conditions. Also, the more shield gas and the lower natural cooling time, the higher tensile strength but the lower elongation. The absorption energy of the 4 pass welded specimens, was decreased about 50% more than that of the 7 pass welded specimens, and the more shield gas, the higher impact absorption energy value. The higher hardness, the lower pass, but the natural cooling time almost had no relation to the hardness. The fatigue life was shown higher as following the order, boundary zone > HAZ > welding zone > base metal. Especially the fatigue life of boundary zone notched specimen was shown 700% higher than that of base metal.

Ti재의 용접조건에 따른 기계적 특성에 관한 연구

최병기,장경천,정장만 朝鮮大學校 機械技術硏究所 2002 機械技術硏究 Vol.5 No.1

Ti재를 이용하여 여러 가지 용접조건 시험편을 제작하여 특서을 측정해 본 결과 다음과 같은 결론을 얻을 수 있었다. 1) 동일한 용접조건에서 패스 수에 따라 4패스는 7패스와 비교하였을 경우 인장강도가 10%정도 높게 나타났고, 연신율은 30%정도 감소함을 알 수 있었다. 또한 실딩가스량이 많고, 용접 후 자연냉각 시간간격이 길수록 인장강도는 높게 나타났고, 연신율은 감소하였다. 2) 충격 흡수에너지값은 4패스는 7패스에 비해 50%정도 감소하였으나, 실딩가스량이 많을수록 높게 나타났다. 또한 경도값은 패스 수가 적을수록 높게 나타났으며, 용접 후 자연냉각 시간간격에는 비숫하였으나 용접 후 자연냉각 시간간격이 적은 것은 조금 감소하였다. The purpose of this paper was to investigate the welding characteristics of titanium commonly using power station, aircraft and ship. The experimented material was TIG welded in order to look over the mechanical properties. The tensile strength and elongation of the 4 pass welded specimens was shown about 10% and 30% higher than those of the 7 pass welded specimens at the same welding conditions. Also, the more shielding gas and the shorter natural cooling time, the higher tensile strength but the lower elongation. The absorption enery of the 4 pass welded specimens was decreased about 50% more than that of the 7 pass welded specimens, and the more shielding gas, the higher impact absorption energy value. The higher hardness, the lower pass, but the natural cooling time almost had no relation to the hardness.

순수 Ti 용접재의 기계적 특성 및 피로크랙 성장특성에 관한 연구

최병희,이종범,정장만,장경천,최병기 朝鮮大學校 機械技術硏究所 2007 機械技術硏究 Vol.10 No.2

In this study, fatigue fracture often occurs due to the fatigue crack in the machine and welding structure and this is the result of severe operational environment, operational condition, and design condition caused by the large scaled and light weighted machine and structure in recent days. Therefore, safety and reliability should be secured to prevent the fatigue fracture of machine and structure, and the use of titanium has been increased in the metal material for the safety and reliability. The purpose of this thesis was to investigate the welding characteristics and fatigue crack growth characteristics of titanium, commonly using power station, aircraft and ship. The experimented material was TIG welded in order to look over the characteristics according to the notch position and compare with other material. The results, at the same welding condition, 4 pass specimen which had the smallest number of welding pass had the highest tensile strength with 51kgf/㎟ and the tensile strength of 4 pass specimen was 10% higher than the one of 7 pass specimen, and its elongation reduced about 30%. The initial fatigue crack growth characteristic is slower in this order, boundary zone < welding zone < HAZ < base metal. Especially boundary zone's growth speed is slower about 30 times than base metals.

Ti 鎔接材의 機械的 特性 및 殘留應力의 分布에 關한 硏究

최병기,장경천,국중민,정장만,구남열 한국산업안전학회 2003 한국안전학회지 Vol.18 No.1

The objective of this paper was to investigate the welding characteristics according to the restraint condition, the pass number, and the shield gas quantity with titanium commonly using in power stations, aircrafts, ships, and so forth. The residual stress distribution was measured under restraint and nonrestraint welding conditions. The tensile strength and elongation of the 4 pass welded specimen were shown higher about 10% and 30% than those of the 7 pass welded specimen at the same welding conditions respectably. Also, the more shield gas quantity and the shorter natural cooling time, the higher tensile strength and the lower elongation.

분산 컴퓨팅 환경과 미들웨어

조성연,장주만,전병태 高麗大學校附設 컴퓨터科學技術硏究所 1999 JOURNAL OF COMPUTER SCIENCE & ENGINEERING TECHNOLO Vol.1 No.-

미들웨어라는 개념은 클라이언트/서버 환경에서 클라이언트와 서버를 연결해 주는 역할을 하는 모든 어플리케이션들을 포함한다. 그러나 단순히 클라이언트와 서버를 연결시켜 주는 것만으로 미들웨어라고 할 수 있는 것은 아니다. 클라이언트의 서비스 요구를 서버에게 전달하고 요구 사항을 처리한 서버의 결과를 클라이언트에게 전달하는 과정의 수행을 책임진다. 그 과정에서 실제 서비스의 처리나 결과를 사용자에게 보여주는 과정은 서버와 클라이언트의 몫으로 제외된다. 미들웨어는 분산 환경에서 확장성과 개방성을 제공하는 핵심 부분이다. 미들웨어의 기본 기능인 투명성이외의 통신 기능, 스케줄링 기능, 트랜잭션의 기능 등등의 많은 서비스를 제공한다. 현재 미들웨어는 제공하는 기능의 특징에 따라서 종류가 다양하다. 본 논문에서는 미들웨어의 범위를 정의하고 현재 개발되고 있는 미들웨어들인 RPC, ORB, MOM을 분석하고 비교한다. Middleware covers all softwares that connect client and server. but middleware not only do connection. it takes responsible all through process from that client requests service to that server returns result except real processing of service. middleware is essential of distributed environment. middleware provides communication function, thread scheduling function, transaction function etc. there are different characteristic middleware according to characteristics. this article defines what is middleware and compares different middlewares with another especially PRC, ORB, MOM.

기능성 Zeolite-KCIO₃ 복합체에 의한 Chlorothalonil의 분해

최충렬,박만,이동훈,이병묵,이인구,최정,김장억 한국환경농학회 2004 한국환경농학회지 Vol.23 No.2

Salt occlusion in zeolite is a unique phenomenon that takes place only when the salt size is similar to the window size of host zeolite. KClO₃-occluded zeolite, as an environment-friendly oxidant, has a high potential for effective removal of various organic pollutants. This study was carried to investigate the characteristics and the removal kinetics of fungicide chlorothalonil by zeolite-KClO₃ complex. About 10% of KClO₃ was occluded in zeolite pores synthesized by salt-thermal method from fly ash, although the occlusion amount was relatively less compared to that of nitrate salts. By occlusion with KClO₃, no remarkable changes were found in X-ray diffraction patterns of cancrinite, whereas some decrease of overall peak intensities was found with those of sodalite. Different releasing kinetics of ClO^(-)₃ ion were observed in distilled water and soil solution from zeolite-KClO₃ complex. Two reactions, hydration and diffusion, seem to be related with the release of KClO₃. Therefore, the release isotherm of ClO^(-)₃ ion well fitted to the power function model which indicate the release was made by hydration and diffusion. The removal of chlorothalonil by zeolite and KClO₃ reached at reaction equilibrium within 6 hours by 18% and 47%, respectively. However, the chlorothalonil removal by the zeolite-KClO₃ complex increased slowly and steadily up to 92% in 96 hours. These findings suggested that zeolite-KClO₃ complex could be applied for effective removal of organic contaminants in the soil and aqueous environment.