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FST(Fuzzy Search Tree)를 이용한 Fuzzy Query Handling Mechanism
조원봉(Won-Bong Cho),김용훈(Yong-Hoon Kim),조영임(Young-Im Cho),황종선(Jong-Sun Whang) 한국정보과학회 1991 한국정보과학회 학술발표논문집 Vol.18 No.1
정보 처리 시스템에서의 원하는 요구사항에 fuzzy 개념이 포함되어 있을 경우, 기존의 확률론에 근거한 방법으로는 원하는 레코드에 대한 search가 정확하지 못하다. 따라서 본 논문에서는 Fussy Query을 효과적으로 처리할 수 있는 새로운 방법을 제시하였다. 즉 Fussy 개념을 처리함에 있어서 기존의 방법인 확률에 근거하지 않고 가능성 이론에 근거한 Membership 함수를 이용함으로써 원하는 레코드를 보다 정확하게 그리고 빠르게 검색할 수 있다. 본 논문이 제시한 방법은 FST(Fussy Search Tree)를 이용하므로서 기존의 Search 방법보다 Average Search Time면에서 더 우수할 뿐만 아니라 fuzzy query의 미세한 부분(예, 매우, 다소 등)까지도 반영할 수 있으므로 매우 정확한 레코드를 검색할 수 있다. 본 논문이 제시한 방법은 프로그램으로 구현하여 기존의 방법과 비교 분석하였다.
매설방법과 차량하중에 따른 벤더형 압전에너지 하베스터의 설계 및 평가
김창일,정영훈,윤지선,조정호,백종후,장용호,최범진,박신서,조영봉,Kim, Chang-Il,Jeong, Young-Hun,Yun, Ji-Sun,Cho, Jeong-Ho,Paik, Jong-Hoo,Jang, Yong-Ho,Choi, Beom-Jin,Park, Shin-Seo,Cho, Young-Bong 한국전기전자재료학회 2016 전기전자재료학회논문지 Vol.29 No.5
A road energy harvester was designed and fabricated to convert mechanical energy from the vehicle load to electrical energy. The road energy harvester is composed of 20 piezoelectric materials. This study attempted to evaluate output depending on pavement materials when paving road piezoelectric energy harvester in the road. Harvester is the bender type and is the method of supporting the both ends of piezoelectric material and applying the load in the middle part. Harvester was paved in the type paved with asphalt, type paved with cement and in the exposed type not covering the top of harvester. The output characteristics were compared and evaluated depending on changes in vehicle load and vehicle speed changes. As vehicles, truck (11.9 ton), SUV(1.6 ton) and sedan (1.5 ton) were used and the output characteristics when driving at the interval of 10 km/h from 10 km/h to 100 km/h were evaluated.
압전 캔틸레버 구조를 이용한 도로용 에너지 하베스터의 개발 및 평가
김창일,김경범,전종학,정영훈,조정호,백종후,강인석,이무용,최범진,조영봉,박신서,남산,이영진,Kim, Chang-Il,Kim, Kyung-Bum,Jeon, Jong-Hac,Jeong, Young-Hun,Cho, Jeong-Ho,Paik, Jong-Hoo,Kang, In-Seok,Lee, Moo-Yong,Choi, Beom-Jin,Cho, Young-Bong 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.7
A road energy harvester was designed and fabricated to convert mechanical energy from the vehicle load to electrical energy. The road energy harvester is composed of 24 piezoelectric cantilevers and a vehicle load transfer mechanism. Applying a vehicle load transfer mechanism rather than directly installing energy harvesters under roads decreases the area of road construction and allows more energy harvesters to be installed on the side of the road. The power generation amount with respect to the vehicular velocity change was assessed by installing the vehicle load transfer mechanism and the energy harvester in the form of speed bumps and underground. The energy harvester installed in a speed bump form generated power of 7.61 mW at the vehicular velocity of 20 km/h. Also, power generation of the energy harvester installed in the underground form was 63.9 mW at the vehicular velocity of 28 km/h. Although the number of piezoelectric cantilevers was reduced by 1/3 to 24 in comparison to the previous research results with 72 piezoelectric cantilevers, similar power generation characteristic value was obtained within the vehicular velocity of 20 km/h by altering the vehicle load transfer mechanism and cantilever vibration method.
Sprague-Dawley 랫드에서 60일간 용접흄 폭로에 의한 폐기능 변화
성재혁(Jae Hyuk Sung),최병길(Byung-Gil Choi),맹승희(Seung-Hee Maeng),김수진(Soo-Jin Kim),정용현(Young Hyun Chung),한정희(Jeong Hee Han),현진숙(Jin Suk Hyun),송경석(Kyung Seuk Song),조영봉(Yong Bong Cho),조명행(Myung-Haing Cho),유일재 한국독성학회 2004 Toxicological Research Vol.20 No.1
Respiratory effects in full time welders include bronchitis, airway irritation, lung function changes, and lung fibrosis. Welder's pneumoconiosis has been generally determined to be benign<br/> and not associated with respiratory symptoms based on the absence of pulmonary function abnormalities in welders with marked radiographic abnormalities. Accordingly, to investigate pulmonary function changes during 60 days induced by welding-fume exposure, male Sprague-Dawley rats were exposed to manual metal arc-stainless steel (MMA-SS) welding fumes with concentrations of 64.8+0.9 mg/㎥ (low dose) and 107.8±2.6 mg/m3 (high dose) total suspended particulates for 2 hr/day, 5 days/week in an inhalation chamber for 60 days. Pulmonary function was measured every week with whole body plethysmograph compensated (WBP Comp, SFT38116, Buxco Electronics, Sharon, CT). The rats exposed to the high dose of welding fumes exhibited statistically significant (p<0.05-0.01) body weight decrease as compared to the control whereas cell number increase of the bronchoalveolar lavage fluid (BALF) (total cell, macrophage, polymorphonuclear cell and lymphocyte) during the 60 days exposure period. And only tidal volume was significantly decreased in dosedependantly during 60 days of MMA-SS welding fume exposure. This pulmonary function change with inflammatory cell recruitment confirms the lung injury caused by the MMA-SS welding fume exposure.
이황화탄소를 경구투여한 흰쥐의 혈중 이황화탄소에 관한 연구
조명화,이경종,문영한,조영봉,노재훈,김치년 大韓産業醫學會 1993 대한직업환경의학회지 Vol.5 No.2
Carbon disulfide (CS₂) ditributed in the body by the blood stream, presents free form and bound form carbon disulfide that is acid-labile carbon disulfide(ALCS₂) in blood. ALCS₂could be analyzed by acid-treatment fraction which binds to celluar macromolecules or amino acid. We observed the variation of blood concentration of carbon disulfide and the amounts of free form CS₂and ALCS₂in blood were determined according to their oral doses. After administration for six days, the amount of free form CS₂and ALCS₂in blood was increased significantly through duration of administration for six days. ALCS₂was remained longer than free form CS₂in blood for all doses. The amount of free form CS₂and ALCS₂in red blood cells was larger than that of plasma. As the above results, ALCS₂might be a useful indicator for biological monitoring of CS₂in blood.
김치년,노재훈,조영봉,문영한 大韓産業醫學會 1992 대한직업환경의학회지 Vol.4 No.2
The objectives of this study are developing the optimal analytic methods for detecting urinary metabolites of carbon disulfide(CS₂) and determining which metabolite is more useful biological indicator for CS₂metabolites, For this experiment, we used synthesized CS₂metabolites, 2-thio-thiazolidine-4-carboxylic acid(TTCA) and thiocarbamide. Those were identified by infrared spectroscopy and nuclear magnetic resonance spectroscopy. The maximum absorbances of TTCA and thiocarbamide were 272 nm and 236 nm respectively. Detection by UV detector was more precise and accurate than that by infrared spectrophotometer. Ethyl acetate extraction method was adopted as precleaning method for HPLC analysis of urinary methabolites. Urinary amount of TTCA and thiocarbamide were measured by HPLC after administration of CS₂(350mg/kg, 700mg/kg) into Sprague-Dawley rats intraperitoneally. Excreted amounts of urinary TTCA and thiocarbamide were increased by the doses of CS₂administration. The urinary amount of TTCA was greater than that of thiocarbamide after administration of both doses of CS₂in rats. These results showed that TTCA seened to be more useful biological indicator for CS₂exposure as ACGIH recommended, however further studies are need to simplyfy analytic methods for measuring the urinary metabolites of CS₂and clarify mechanisms of CS₂metabolism.
이신영,김치년,조영봉,오상용,노재훈 한국산업위생학회 2003 한국산업보건학회지 Vol.13 No.2
The limit of detection(LOD), pooled coefficient of variation(pooled CV), desorption dffciency(DE), and stability after desorption by pre-treatments was compared and evaluated for analyzing the Ethylene oxide(EO) sampling on HBr-coated Charcoal tube, The results were as follows: 1. The EO's LOD was 2,483ug/sample when using the desorptin solvent, benzene : CS2(99:1), and 1.919ug/sample after using DMF. The result of the sample that passed DMF desorption and was derivativized was 1.301ug/sample. 2. EO's pooled CV was 0.00503 when using the solvent benzene:CS(99:1), after desorption with DMF, the result was 0.00329, and the result of those derivativized by DMF desorption was 0.00514. 3. EO's DE using the solvent benzene:CS(99:1) was 92.13%, atter desorption with DMF, it was 102.75%, and the result of those studied after being derivativized by DMF desorption was 96.47%. 4. EO's stability for the sample with the solvent benzene:CS(99:1), comparing result of next-day analysis to same-day was 96.81% after desorption was 95.69% These results were in accordance with the less than 5% given by OSHA methoc 50. In conclusion, when pre-treatment of the EO in the HBr=coated charcoal, analyzing immediately after desorption by DMF is more simple, precise, and efficient than other analyzing methods, and the stabiity of the sample 24 hours after desorption was alst established.