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항공사 안전관리시스템에 대한 조종사의 인식과 안전행동에 대한 연구
조성환,김기웅,박성식,Cho, Sung Hwan,Kim, Ki Woong,Park, Sung Sik 한국항공운항학회 2014 한국항공운항학회지 Vol.22 No.2
This paper has tried to research the perception of pilots in a commercial airliners or full service carriers focusing on the airliner's safety management system (SMS). ICAO requires the airliners to set up the basic standards of SMS since the SMS is believed to be the core of the aviation risk management. According to the previous study, it was proved safety climate of an airline affects the safety behavior of cockpit crews. Safety climate is different from safety culture and the safety climate has an advantage to be measured more quantitatively than the culture. That is, the safety climate could be represented as SMS. As the results of the empirical study based on Chen & Chen(2014)'s SMS practice sacle, it had been assumed at the beginning the major factors such as Clarification of SMS, Safety Training for Crews and Sharing of SMS Information have positive effects on the motivation for safety behaviors. The motivation is directly correlated to crews' safety behaviors. However, the result showed the clarification of SMS has not a significant effect on their safety behaviors. The main reason is cockpit crews, through the survey, perceived airline seemed to have no definite standards of SMS and the senior management to have less interest in aviation safety.
조성환,김형재,김호윤,서헌덕,김경준,정해도,Cho, Sung-Hwan,Kim, Hyoung-Jae,Kim, Ho-Youn,Kim, Heon-Deok,Seo, Kyoung-Jun,Jeong, Hae-Do 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.10
This study presents the possibility of scratch reduction on wafer in CMP by applying the ultrasonic and megasonic energy into the slurry which might contain large abrasive particles. Experiments were conducted to verify the dispersion ability of agglomerated particles by applying ultrasonic, megasonic waves and analyze the particle distribution of used slurry in case, of sonic energy assisted or none. And the dispersion stability of megasonic waves was investigated through the experiment of stability of the dispersed slurry, Finally, to confirm that the distribution of particles in slurry by ultrasonic waves was actually related to scratches on wafer when CMP was done, tungsten blanket wafer was processed, by CMP to compare and investigate scratches on wafer.
조성환,Cho, Sung-Hwan 한국응용생명화학회 1977 Applied Biological Chemistry (Appl Biol Chem) Vol.20 No.2
인삼(人蔘)의 유효성분(有效成分)으로 알려진 saponin을 Thin layer chromatography로 전개(展開)하여 Digital Densitometer를 사용(使用)하여 한국인삼(韓國人蔘)의 산지별(産地別), 부위별(部位別), 재배연도별(栽培年度別) saponin함량(含量) 및 그 saponin fraction의 조성비(組成比)를 정량(定量)하고, 홍삼(紅蔘) 및 인삼(人蔘)엑기스 제조중(製造中) 일어나는 saponin함량(含量)의 변화(變化)를 연구(硏究)하여 다음과 같은 결과(結果)를 얻었다. 1. 산지별(産地別) saponin 함량(含量)에는 별로 차이(差異)가 없었으며, panaxadiol을 aglycone으로 하는 saponin군(群)과 panaxatriol을 aglycone으로 하는 sapon군(群)의 조성비(組成比)는 ($1.7{\sim}2.6$) : 1정도였다. 2. 부위별(部位別)로 볼 때, saponin함량(含量)은 미삼(尾蔘)이 12.7%로서 3.3%인 백삼(白蔘)의 4배에 가까운 높은 값을보였다. 그리고 saponin fraction별(別)로 볼 때, panaxadiol을 aglycone으로 하는 saponin fraction도 미삼(尾蔘)이 백삼(白蔘)보다 많으나, panaxatriol을 aglycone으로 하는 saponin fraction은 반대(反對)로 미삼(尾蓼)이 백삼(白蔘)보다 적었다. TLC의 2차원전개결과(次元展開結果), ginsenoside-Rd는 백삼(白蔘)에만 나타나고, 미삼(尾蔘)에서는 나타나지 않는 반면(反面), Rf와 $Rg_1$은 미삼(尾蔘)에서는 분리(分離)되었으나, 백삼(白蔘)에서는 $Rg_1$만이 존재하고, Rf는 분리(分離)되지 않았다 3. 재배연도별(栽培年度別) 근부(根部)의 saponin함량(含量)은 재배기간(栽培其間)에 따라 일정(一定)한 경향(傾向)을 찾아볼 수 없으나, 인삼근당평균(人蔘根當平均) saponin함량(含量)은 2년근(年根)이 90.3mg, 3년근(年根)이 254.2mg. 4년근(年根)이 404.2mg, 5년근(年根)이 996.9mg, 6년근(年根)이 1377.1mg으로 재배기간(栽培其間)이 길어질수록 현저(顯著)하게 높았다. 그리고 인삼지상부(人蔘地上部)의 saponin함량(含量)도 재배기간(栽培其間)에 길어질수록 높아지는 경향(傾向)을 볼 수 있었다. 그러나, saponin fraction별(別)볼 때는 $5{\sim}6$년(年)의 수확기(收穫期)에 가까워질수록 panaxatriol을 aglycone으로 하는 saponin fraction의 함량(含量)이 높았다. 4. 홍삼제조중(紅蔘製造中)의 saponin fraction별(別) panaxadiol을 aglycone으로 하는 saponin fraction의 조성비(組成比)도 건삼(乾蔘)에 비(比)하여 홍삼(紅蔘)이 낮아졌으나, panaxatriol을 aglycone으로 하는 saponin fraction의 조성비(組成比)는 건삼(乾蔘)에 비(比)하여 홍삼(紅蔘)이 오히려 높았다. 홍삼(紅蔘)의 Thin layer chromatogram에는 건삼(乾蔘)의 그것에 나타나지 않았던 수개(數個)의 미확인(未確認) spot를 더 볼 수 있었다. 5. Ethanol과 물로 미삼(尾蔘)을 추출(抽出)하여, 29.9%의 인삼(人蔘)엑기스를 얻었는데, 이 엑기스에는 미삼(尾蔘)으로부터 추출수율(抽出收率)이 94.2%에 상당(相當)하는 saponin이 이행(移行) 함유(含有)되어 있었다. The studies on the saponins of Korean ginseng, Panax ginseng C.A. Meyer, were performed according to the cultivating locations, sampling seasons, plant parts, and growing stages. The changes in saponin content in the course of manufacturing Red ginseng and Ginseng extract were observed. In this paper, a new method for the determination of the total and the individual saponin glucosides was proposed and applied to the samples under study. The method employing Digital Densitorol DMU-33C (Toyo electric Co., Japan) followed the separation of the saponins by means of a preparative thin layer chromatography. The saponin contents and their fractional distribution were summarized as follows: 1. The average concentrations(% plant dry weight) of semi-purified saponins in the roots of Korean ginseng planted in the various locations were 5.0%(Keumsan), 6.0% (Kimpo), and 5.4% (Pocheon), respectively. 2. There were 3.3% saponins in White ginseng(Rhizome) and 12.7% saponins in Ginseng tail (Fibrous root). 3. Regarding the year of growth, the contents of saponins were 90.3mg (2-year-old ginseng), 254.4mg (3-year-old ginseng), 404.2mg (4-year-old ginseng). 999.6mg (5-year-old ginseng), and 1377.1mg (6-year-old ginseng) respectively, and the saponin factions containing panaxatriol as an aglycone increased. 4. Thin layer chromatography revealed that Red ginseng yielded many saponins which Shibata et al. designated as $ginsenoside-Rb_1$ (22.1%), $-Rb_2(15.4%)$, -Rc(12.6%), -Re (15.7%), and $-Rg_1$, (9.3%). 5. 29.9% of crude saponins were isolated from ethanolic extract of Panax ginseng fibrous root and their extraction yield was 94.2% of fibrous root saponin.
Prostaglandin F<sub>2</sub><sub>α</sub> 투여(投與)에 의한 생쥐 태반(胎盤)의 조직학적변화(組織學的變化)
조성환,이차수,Cho, Sung Whan,Lee, Cha Soo 대한수의학회 1979 大韓獸醫學會誌 Vol.19 No.2
This paper was carried out to observe prostaglandin $F_{2{\alpha}}$-induced morphological changes in the placenta. White mice received intramuscular injections of $PGF_{2{\alpha}}$(containing dinoprost tromethamine 0.5mg/ml, Upjohn Co.) in once or twice with doses of 0.1ml on 10th to 18th day of their respective pregnancies, the histological changes of the placentae and ovaries were observed with light microscope. Abortion within 21 to 51 hours following $PGF_{2{\alpha}}$ administration occurred in the pregnant mice. Vacuolization of trophospongial cells, giant cells and myometrium under decidua basalis, spherical acidophilic inclusion bodies of various sixtes in trophospongial cells and giant cells. hydropic degeneration and necrosis of labyrinthine trophoblasts and yolk cells, and infltration of neutrophils in the placenta and the uterus were observed. In addition, there were decrease in glycogen of the placental labyrinth and the visceral yolk sac, but increase in glycogen deposit of mesometrial myometrium. Atrophy and increase in number of large lipid droplets of the luteal cells and proliferation of fibroblasts were also recognized in the corpora lutea.
베네치안 블라인드의 슬래트 각도변화가 건물의 냉난방 부하에 미치는 영향
조성환,신기식,Cho, S.H.,Shin, K.S. 대한설비공학회 1995 설비공학 논문집 Vol.7 No.2
Generally, among many kinds of shading devices such as venetian blind, sunscreen, louver and curtain, venetian blind is using widely because the mechanism is so simple and easy to use solar insolation by controlling the slat angle. Analysis of time dependent heat transfer through the window with venetian blind is very important in order to use it effectivly. Therefore, in this study, theoretical thermal analysis method was developed to analyze time dependent heat transfer through a double pane window with and without venetian blind, and was made one module of TRNSYS(A Transient Simulation Program)program. By this way, it was analyzed that how much the variation of slat angle, slat colour and slat absorptivity of venetian blind would be affected on the heating and cooling load of building, and also which colour and angle of slat was optimal for the heating and cooling load of building.
조성환,태춘섭,장철용,Cho, S.H.,Tae, C.S.,Jang, C.Y. 대한설비공학회 1997 설비공학 논문집 Vol.9 No.4
An experimental facility consisting of two $3{\times}4.4{\times}3.8m$ rooms identical in construction is built. Each room has a control system and storage tank supplying hot water to the radiant floor heating system. The facility enables simultaneous comparision of two different control stratigies each implemented in a separate room. The operating performance of three kinds of flow control scheme is tested and compared in this study : (i) conventional on-off control based on feedback from room air temperature (ii) TPSC(two parameter switching control) (iii) TPOC(two parameter on-off control). Results show that TPSC and TPOC using room air and surface temperature sequentially as feedback signal to control hot water supply is the better temperature regulation scheme than conventional control based on feedback from only room air temperature. They are good candidates for the room with radiant floor heating system under continuous and intermittent heating mode.
조성환,Cho, Sung-Whan 대한설비공학회 1986 설비저널 Vol.15 No.4
An optimum design condition for a basic refrigeration cycle is defined as the condition which minimizes the total cost of heat exchanges (condenser and evaporator) and compressor for the refrigeration effect. Thermodynamic properties of ammonia (R717) are approximated by rational functions in order to obtain the optimum condition for a basic refrigeration cycle. Optimum condition depends on the heat capacity rates (mass flow rate times specific heat) of cooling water and brine used in condenser and evaporator. The difference between the cooling water temperature and condensation temperature at the optimum condition increases as the heat capacity rates and the coat of heat exchangers relative to the cost of compressor increase. Numerical examples of optimum conditions are obtained when the condensation temperature is $30^{\circ}C$ and the evaporator temperature is $-10^{\circ}C$.
돼지의 Perirenal Edema의 자연발생예(自然發生例)와 실험적발생예(實驗的發生例)의 병리학적소견(病理學的所見)
조성환,이차수,Cho, Sung-whan,Lee, Cha-soo 대한수의학회 1984 大韓獸醫學會誌 Vol.24 No.2
This paper dealt with the histopathological observations of the perirenal edema in pigs and rabbits administered with Amaranthus retroflexus, based on the clinical and pathological observations of the porcine perirenal edema naturally occurred in Korea. The results observed are summarized as follows; In the natural case, clinical signs were trembling, weakness and incoordination of the hindquarters, followed by sternal recumbency, coma and death. Death usually occurred within 24 hours after the signs of illness appeared. In gross findings, the grayish yellow fluid in the perirenal area was observed in each case. In some cases, the amount of fluid in the thoracic and abdominal cavities was increased and the yellowish red color of the hydrothorax and ascites was seen. When the renal capsule was incised, the kidneys were enlarged and congested and petechiae on the cortical surface and blood clots on the capsule appeared. In microscopical findings, there were cloudy swelling, hyaline droplets and necrosis of the convoluted tubules containing proteinaceous casts and a few oxalate crystals. In addition, interstitial and perivascular edema, distention of the Bowman's space and the convluted tubules and hemorrhages were recognized. In the weanling pigs and the adult pig fed various weeds, including Amaranthus retroflexus, Euxolus blitum and Portulaca oleracea, the pigs fed Amaranthus retroflexus appeared clinical signs and pathological findings of perirenal edema usually seen in the pigs of natural cases. In the pigs fed Euxolus blitum or fed Portulaca oleracea, neither clinical signs nor pathological changes were seen. It was regarded that this disease was affected with Amaranthus retroflexus, but there was no sensitivity in the adult pigs.
발효음식에 의한 연성 의치상 이장재의 색상 변화에 관한 연구
조성환,임헌송,신수연,Cho Seong-Hwan,Lim Heon-Song,Shin Soo-Yeon 대한치과보철학회 2004 대한치과보철학회지 Vol.42 No.5
Statement of problem: The clinical criteria of soft lining materials are resilience over an extended period, capability of forming a strong bond with denture base materials, dimensional stability, adequate tear strength, and color stability. Many researches and reports dealt with food colorants or denture cleanser, but not with fermented foods. Purpose : This study was designed to assess what fermented foods, such as soy sauce and red pepper paste that many Koreans have eaten, influence on the color stability of soft denture liners. Material and methods: The color differences (${\Delta}E^*$) were measured by spectrophotometer with different immersion time. For the procedure, thirty disk-shape specimens per 4 soft denture linears(Molloplast-$B^{(R)}$, Ufi Gel $SC^{(R)}$, Dura $Base^{(R)}$, Sofreliner $MS^{(R)}$) were fabricated with a thickness of 2mm and 16mm in diameter. Each 10 specimen were immersed into the beakers of fermented foods distilled water, and $L^*$, $a^*$, $b^*$ values were measured for the color difference(${\Delta}E^*$), on the 1st, 7th, and 28th day with spectrophotometer. Result and conclusion : 1. There were significant differences between samples(soy sauces, red pepper pastes, and distilled water) in Sofreliner $MS^{(R)}$ of 1st day after immersion(p<0.05). There were significant differences between samples in Sofieliner $MS^{(R)}$ and Ufi Gel $SC^{(R)}$ of 7th days after immersion(p<0.05). There were significant differences between samples in Molloplast-$B^{(R)}$ of 28th day after immers ion(p<0.05). 2. In red pepper pastes, ${\Delta}E^*$ values of Molloplast-$B^{(R)}$, Ufi Gel $SC^{(R)}$, Sofrelinev $MS^{(R)}$ weve higher than 3.3. Those values were not clinically acceptable. In soy sauces, ${\Delta}E^*$ values of all denture liners were lower than 3.3. ${\Delta}E^*$values of Ufi Gel $SC^{(R)}$ were higher than those of other denture liners 3. Based on the above results , red pepper paste causes more discoloration than soy sauce.