스파크 신호검출에 의한 전기화재 예측

길경석,김일권,송재용 한국해양대학교 산업기술연구소 2002 연구논문집 Vol.19 No.-

This paper describes a technique that can predict electric fires by detecting a spark signal generated from operation of electric facilities. An electric fire lead a loss of life as well as huge property, therefore it is very important to predict an electric fire and eliminate the causes of it. Electrical spark which is ranked as majority causes of electric fires has a characterized frequency bandwidth distinguished from power frequency. In this experiment, various spark signals are simulated in a condition such as short circuit, flashover, and surface discharge. The results showed that the monitoring of spark signals can predict electric fires.

百貨店의 마케팅 戰略수립을 위한 膳物購買行動과 價値體系의 관련성에 관한 연구

고경태,강희숙 全北大學校 敎育大學院 1994 敎育論叢 Vol.14 No.-

This paper deals with providing theoretical bases for the development of gift merchandising strategies for the department store. History of the department store shows that gift merchandising can be a powerful response to changing retail environment. Our empirical survey shows that the behavioral characteristics of gift purchasers are explained and predicted with their value system and their perception of the functions of gift giving. Gift merchandising and other management areas in the department store should use these and other relations found in our survey.

진딧물의 경보페로몬인 (E)-β-Farnesene의 합성과 생물활성시험

강석구,정경운,이정운,고현관 성균관대학교 기초과학연구소 1986 論文集 Vol.37 No.1

(E)-β-Farnesene, the alarm pheromone of aphids was synthesized from nerolidol by reacting in a sealed tube at 150℃ for 24h with DMSO. Base(KOtBu/DMSO) catalized elimination of HCl from farnesyl chloride at 50℃ for 4h afforded (E)-β-farnesene as the major product. Farnesyl chloride was prepared from nerolidol or farnesol with SOCl_2 or HCl. Biological activity test of (E)-β-farnesene thus synthesized was conducted.

멸강나방의 성유인물질의 합성

姜錫久,정경윤 성균관대학교 기초과학연구소 1985 論文集 Vol.36 No.2

A Wittig route for the synthesis of (Z)-11-hexadecen-1-ol and (Z)-11-hexadecen-1-yl acetate, the sex attractant of the Leucania Separats is described. Esterification of 1, 10-decandicarboxylic acid, followed by partial hydrolysis of the diester gave 1, 10-dicarboxylic acid monoethylester. Hunsdiecker reeaction of the monoester gave ethyl 10-bromoundecanoate. Pyridine-N-oxide oxidation of the bramoester yielded ethyl 10-oxo-undecanoate, an aldehydoester. Olefination of the aldehydoester with pentylidenetriphenylphosphonium ylide afforded ethyl (Z)-11-decenoate. LAH reduction gave (Z)-11-hexadecen-1-ol. Acetylation of (Z)-11-hexadecenol afforded (Z)-11-hexadecen-1-yl acetate.

재생잔골재의 건축용 건조모르타르 적용에 관한 기초연구

김경덕,강석표,홍성윤 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)

The natural aggregate will be used up within 10 years due to the great amount of consumption in making of construction materials. Regarding reservation of natural aggregate, the construction waste has to be recycled as one of important constituents of construction materials, typically, concrete. In mortar industry, the demand of fine aggregate is much heavier as industry developed. It is highly essential to think of application study using recycled fine aggregate. In this study, we investigated the effect on basic properties of screeding mortar when recycled fine aggregate is replaced. This study presents document in order to give an applicable guideline for the best use of recycled fine aggregate together with checking properties. We could find that screeding mortar properties is not much influenced by the existence of recycled fine aggregate because particle size distribution is well classified through manufacturing process. As a result, it is considered that application of recycled fine aggregate in dry mortar system is sufficient.

방사선 펄스 계측 및 분석시스템에 관한 연구

길경석,손원진,송재용,김일권 한국해양대학교 산업기술연구소 2002 연구논문집 Vol.19 No.-

An objection of this study is to develop a measuring circuits and a analytic system for radioactive pulses. The proposed system consists of a pulse detection units for neutrons and gamma-rays, a programmable high voltage supply unit and a digital signal processor. Gamma-ray detection circuit can count pulse up to 10,000[pps]. The pulse detection parts consists of an active integrator, a pole-zero circuit, and a 3-stage amplifier of 60[dB], and its frequency bandwidth is from 37[Hz] to 300[kHz]. Also, pulse height distribution in accordance with pulse counts is important data in analyzing radioactive pulses. In this study, A/D converter (12[bit], 100[ns] and DSP [TMS 320C31-60) are used to analyze the pulse height, and the analytic system is designed to be operated in PC-base. Radioactive pulse has superior penetration ability to all kind of materials, and it is also possible to evaluate the soundness of electrical insulation materials by analyzing the pulse counts and/or pulse height distribution.

결명자 추출물의 추출특성 및 항산화 효과

나경민,한호석,예수향,김현구 한국식생활문화학회 2004 韓國食生活文化學會誌 Vol.19 No.5

The present study was conducted to investigate extraction characteristics and antioxidative activity of Cassia tora L. extracts, Casia tora L. was extracted by reflux extraction under different extraction conditions including solvent. The solid yield, turbidity, color value, titratable acidity, free sugar contents, electron donating ability and superoxide dismutase-like ability of Cassia tora L. extracts were determined. The highest solid yield value was obtained with water of 10 fold. No significant difference in turbidity and color value were found among the extracts prepared with various extraction solvents, 75% ethanol, 50% ethanol and water. The highest titratable acidity was obtained with 50% ethanol of Cassia tora L.. The free sugar contents of Cassia tora L. extracted with water showed the highest value. Cassia tora L. extracts with water included higher contents of free sugar compared with those of the other solvent extracts, 50% ethanol and 75% ethanol extracts. The total polyphenol compound content of Cassia tora L. extracted with 50% ethanol showed the highest value. Cassia tora L. extracts with 50% ethanol included higher contents of total polyphenol compound compared with those of the other solvent extracts, water and 75% ethanol extracts.

파뢰기의 열화진단 전문가 시스템 개발에 관한 연구

길경석,김명진,한주섭 한국해양대학교 산업기술연구소 2002 연구논문집 Vol.19 No.-

This paper describes with an effect of a single- and a quadruple- lightning impulse currents on electrical characteristics of ZnO blocks, and an expert system to diagnose deterioration of arresters. In this study, an accelerated deterioration test is carried out to deduce the parameters needed for diagnosing arrester deterioration, and leakage current components are measured. Also, wave height distribution of the leakage current with the progress of arrester deterioration is analyzed. From the experimental results, the wave height distribution of the leakage current showed a conspicuous difference even in an immaterial leakage current increase. The use of wave height distribution of the leakage current in deterioration diagnostic technique makes more accurate diagnosis than the conventional method using only a leakage current value. Finally, the expert system based on the experimental reslts is developed, and the effectiveness of the system is estimated in a 18[kV] lightning arrester.

콘크리트 표면성능개선에 의한 중성화억제방안에 관한 실험적 연구

강석표,김경덕,이병기,길배수,홍성윤,김무한 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1(구조계)

Penetration of concrete by aggressive materials in solution may cause an undesirable effect on concrete durability, for instance when Ca(OH)₂ is being leached out or an attack by aggressive liquids takes place. In particular, carbonation occurs in concrete because the calcium bearing phases present are easily attacked by carbon dioxide and converted to calcium carbonate from surface of concrete, It has been known that the durability of reinforced concrete structure is concerned with the surface performance of concrete which affects on the carbonation occurred by invasion of CO₂ gas and the corrosion of steel bar occurred by O₂ In this paper, the effects of carbonation resistance by improvement of surface performance for concrete are investigated according to the accelerated carbonation test. It is believed that the carbonation resistance of concrete has been significantly improved by the application of penetrative hardening agent due to the formation of a dense surface.

항암제와 Lactobacillus casei HY2782의 병용투여에 의한 항암효과의 증강

윤상군,배형석,김경태,백영진 한국미생물생명공학회 ( 구 한국산업미생물학회 ) 1996 한국미생물·생명공학회지 Vol.24 No.1

S-180 복수암을 유발시킨 생쥐에 대한 BCG, OK-432와 LC2782의 항암효과 비교실험 결과 LC2782를 투여한 생쥐의 평균 생존율은 192%(p<0.001)였으며, OK-432 와 BCG를 투여한 생쥐의 평균 생존율은 각각 141%(p<0.01), 112%였다. 3LL 고형암을 유발시킨 생쥐에 대한 BCG , OK-432와 LC2782의 항암효과 비교실험 결과, LC2782를 투여한 생쥐의 암 억제율은 62%(p<0.05)였으며, OK-432 와 BCG를 투여한 실험군의 암억제율은 90%(p<0.05)와 76.2%(p<0.05)로서 OK-432가 가장 높은 암억제 효과를 나타냈다. 또한 S-180 복수암을 유발시킨 5-Fu와 CP를 단독 투여한 경우의 평균 생존율은 각각 115%와 99%였으나, 5-Fu와 CP를 LC2782 와 병용 투여한 경우의 평균 생존율은 각각 226%(p<0.001)1와 244%(p<0.00)1를 나타내어 단독 투여시보다 2배 이상 생존율이 증가하였다. 3LL 고형암을 유발시킨 생쥐에 5-Fu 와 CP를 LC2782와 병용 투여한 경우의 암억제율은 99.3%(p<0.05)와 73%(p<0.025)였다. Augmentation of antitumor activity of antitumor drugs in combination with Lactobacillus casei Hy2782 (LC2782) was studied against Sarcoma-180 (S-180) and Lewis lung carcinoma (3LL). Antitumor drugs used in this study were 5-fluorouracil (5-Fu) and cyclophosphamide (CP). The prolongation effect of LC2782 on the life span of mouse intraperitoneally implanted with S-180 was stronger than that of OK-432 and BCG, while the inhibitory effect of OK-432 and BCG on the growth of 3LL solid tumor was a little stronger than that of LC2782. Average survival rates of mice administrated LC2782, OK-432 and BCG were 192%, 141%, and 112%, respectively, when that of the control was 100%. Intralesional administration of 5-Fu, CP, 5-Fu+LC2782 and CP+LC2782 resulted in 93%, 69%, 99% and 73% inhibition rates against 3LL solid tumor proliferation. The combination therapy of 5-Fu or Cp with LC2782 significantly prolonged the life span of S-180-inoculated ICR mice. Average survival rates of mice administrated 5-Fu and CP alone were 115% and 99%. Furthermore, survival rates of mice administrated 5-Fu and CP in combination with LC2782 were 226% and 244%, respectively.