일사조절형 창문 시스템

조성환,Cho, S.H. 대한설비공학회 1997 설비저널 Vol.26 No.4

건물자동화시스템에서 냉난방설비의 최적제어기술

조성환,신기식,Cho, S.H.,Shin, K.S. 대한설비공학회 1995 설비저널 Vol.24 No.4

냉동사이클의 최적 설계조건

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 $-10^{\circ}C$.

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.

PVC 배관부품의 마찰 손실

조성환,최진희,Cho, Sung-Hwan,Choi, Jin-Hee 대한설비공학회 1984 설비저널 Vol.13 No.4

Friction factors and equivalent sand roughness of PVC pipe fittings have been studied by experiments in the Reynolds number range of $2,000\~70,000$. PVC pipe fittings studied are straight pipes, $90^{\circ}$ elbows and tees with 15, 25, and 40mm in norminal diameter, all manufactured in Korea with KS mark approval. Equivalent relative roughness of PVC pipes obtained lies between smooth pipe and 0.002. The study shows that equivalent sand roughness of PVC pipes increasses in proportion of the square root of pipe diameter , and can be approximately abtained by multiplying 4 to the root mean square value measured by metal surface roughness tester. Loss coefficient of PVC $90^{\circ}$ elbows decreases slowly with increasing Reynolds number. Loss coeffiicent of tees is a function of ratio of flow rates and Reynolds number.

한국인삼(韓國人蔘)의 Saponin에 관(關)한 연구(硏究) [제1보(第一報)] - Saponin fraction별(別) 정량방법(定量方法)에 관(關)하여 -

조성환,조한옥,김재욱,Cho, Sung-Hwan,Cho, Han-Ok,Kim, Ze-Uook 한국응용생명화학회 1976 Applied Biological Chemistry (Appl Biol Chem) Vol.19 No.4

인삼중(人蔘中)에 함유된 dammarane glycoside들을 glycoside 수준(水準)에서 fraction별(別)로 정량(定量)하는 방법(方法)으로 2차원(次元) TLC법(法)에 의해 분리(分離)된 glycoside를 용출(溶出)하여 Vanillin-$H_2SO_4$ 발색법(發色法)으로 정량(定量)하는 방법(方法)을 검토하는 동시에, 1차원(次元) TLC법(法)으로 SAPONIN FRACTION을 분해(分解)하고 이것을 thinchrograph TFG-10 및 digital densitorol DMU-33c에 걸어 각(各) fraction별(別)로 saponin을 정량(定量)하였다. 1. 2차원(次元) TLC를 병용(竝用)한 Vanillin-$H_2SO_4$ 비색법(比色法)은 각(各) fraction의 정리(定離)는 용이하였으나, 각(各) spot를 동정(同定)하기가 어려웠다. 2. Thinchrograph를 이용하여 saponin를 정량(定量)하는 경우, 비교적 감도(感度)가 높은 ginsenoside의 peak를 얻을 수 있었으나, 동일(同一)한 정량조건(定量條件)에서 표품(標品)과의 대조실험(對照實驗)이 병행(竝行)해야 하므로 표품(標品)의 입수가 어려워, 각(各) peak에 해당하는 saponin동정(同定)이 불가능하였다. 3. Densitometer의 경우 thinchrograph보다 그 감도는 떨어지나, 사용법이 간편하고, 쉽게 각(各) fraction을 동정(同定)할 수 있어 TLC에서 분리(分離)가 좋은 용매를 사용한다면 비교적 정확도가 높은 정량치를 얻을 수 있을 것이다. In this paper, new methods for the determination of the total and the individual saponin glucosides were proposed. One of them was a colorimetric method following Two-dimensional Thin layer chromatography. And the method employing Thinchrograph TFG-10 or Densitorol DMU-33C followed the separation of the saponins by means of a preparative thin layer chromatography. In accordance with the density of the chromatogram of each saponin, Thinchrogram or Densitogram of the individual saponin fraction was plotted and determined.

바닥복사 난방공간의 효율적인 난방제어방법

조성환,태춘섭,Cho, S.H.,Tae, C.S. 대한설비공학회 1996 설비공학 논문집 Vol.8 No.3

By describing the floor slab of a radiant heating system as a one dimensional transient heat exchanger problem, a dynamic analysis model to incorperate with TRNSYS program was developed and their results were compared with experimental results. Results showed that the both of TPOC(Two Parameter On-off Control) and TPSC(Two Parameter Switching Control) method using room air temperature and floor surface temperature as the control parameters does not maintain room air and floor surface temperature exactly at the setting temperatures. But TPSC method is a better candidate for the temperature regulations of room air and floor surface temperature than TPOC method which can keep on the upper and lower limit temperature according to outside temeperature and wall structure etc. And better thermal circumstance can be given by TPSC method than On-off and TPOC method and the overheating which can be occured at the radiant floor heating system with on-off heating control will be reduced.

CMP 슬러리의 분산성 향상에 관한 연구

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.

첨단 창문의 국내외 개발 현황

조성환,Cho, S.H. 대한설비공학회 1996 설비저널 Vol.25 No.5

한우(韓牛)의 위장관(胃腸管)에 존재(存在)하는 내분비세포(內分泌細胞)의 면역세포화학적(免疫細胞化學的) 연구(硏究)

조성환,키타무라 노부오,Cho, Sung-whan,Kitamura, Nobuo 대한수의학회 1988 大韓獸醫學會誌 Vol.28 No.2

Regional distribution and relative frequency of endocrine cells in ten portions of the gastrointestinal tract of the Korean native cattle were observed by immunocytochemical methods using specific antisera against chromogranin, serotonin, somatostatin, glucagon, bovine pancreatic polypeptide(BPP), motilin, gastric inhibitory polypeptide(GIP), neurotensin, secretin, gastrin and substance P. The results observed are summarized as follows: In the abomasum, chromogranin-, serotonin-, somatostatin-, motilin-, glucagon-, gastrin-, and substance P-immunoreactive cells were found. Chromogranin-and serotonin-immunoreactive cells were more numerous in the fundic region than pyloric region. Somatostatin- and gastrinimmunoreactive cells were numerous in the pyloric region than in the fundic region. In the small intestine, chromogranin-, serotonin-, somatostatin-, glucagon-, BPP-, motilin-, gastrin-, GIP-, neurotensin-, secretin-, and substance P-immunoreactive cells were detected. Chromogranin-, somatostatin-, GIP- and secretin-immunoreactive cells were most numerous in the duodenum, while BPP-, motilin-, glucagon-, neurotensin- and substance P-immunoreactive cells were rarely seen in the small intestine. In the large intestine, chromogranin-, serotonin- and BPP-immunoreactive cells were widely distributed and most numerous in the rectum. Somatostatin-, glucagon- and substance P-immunoreactive cells were rarely seen in the large intestine.