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휜이 달린 수소저항합금 베드의 수소저장 성능의 수치적 예측
김명찬,이상용,구재학,Kim, Myeong-Chan,Lee, Sang-Yong,Gu, Jae-Hak 대한기계학회 1998 大韓機械學會論文集B Vol.22 No.4
Heat and mass transfer behaviors of metal hydride beds were predicted by solving a set of volume-averaged equations numerically both for the gas (hydrogen) and the solid(metal hydride) phases. Time variations of temperature and hydrogen concentration ratio distributions were obtained for internally cooled, cylindrical-shaped beds with metal(aluminum) fins imbedded in them. Also, time variations of the space-averaged hydrogen concentration ratio were obtained. Temperature and velocity of the coolant, hydrogen pressure at the gas inlet, and the fin spacing were taken as the parameters. The hydrogen absorption rate increases with the higher velocity and the lower temperature of the coolant, and with the decrease of the fin spacing. Increasing of the hydrogen pressure at the gas inlet also promotes the rate of absorption though the increasing rate gradually slows down. The amount of the hydrogen storage per unit volume of the bed decreases with the tighter fin spacing despite of the higher absorption rate ; therefore, there should be an optimum fin spacing for a given volume of the system and the amount of the hydrogen storage, in which the absorption rate is the highest.
김명찬(Myeong Chan Kim),하상범(Sang Bum Ha),최용석(Yong Suk Choi),김종오(Jong Oh Kim),이성림(Seong Lim Lee),이헌경(Hun Kyung Lee),송승규(Seung Kyu Song),조봉춘(Bong Choon Jo) 대한산부인과학회 2000 Obstetrics & Gynecology Science Vol.43 No.10
목적 : 가임기 여성의 난소출혈은 전형적인 증상과 징후가 없어서 급성충수염이나 자궁외임신과 같은 외과적 응급 질환과 종종 혼동될 수 있다. 난소출혈 환자 101예를 분석하여 신속하고 정확한 감별 진단 및 적절한 치료에 도움이 되고자 본 연구를 시행하였다.연구방법 : 1993년부터 1997년까지 7년 동안 대림성모병원 산부인과에 급성 하복부 동통을 주소로 입원하여 수술적으로 확인된 난소출혈 환자 96예와 비수술적으로 치료한 5예의 총101예를 대상으로 발생연령, 산과력, 임상적 증상과 검사결과, 증상의 발현시 월경주기일, 병리조직학적 소견 및 수술방법에 대하여 분석하였다.결과 : 연령분포는 20대가 72예(71.3%)로 가장 많았고 평균 연령은 26.3세였으며 미산부가 58예(57.4%)이었다. 병변부위는 우측 난소가 64예(63.4%)로 더 많았으며 성교시 발생된 경우가 18예(17.8%)였고, 증상의 발현시 월경주기일은 제20∼30일 사이가 45예(44.6%)로 가장 많았다. 병리조직학적 소견상 황체낭의 파열이 31예(30.7%), 황체의 파열이 25예(24.8%), 난포낭종의 파열이 15예(14.9%), 난소임신이 9예(8.9%) 순이었다. 수술방법은 난소낭종절제술이나 난소부분절제술이 62예(61.4%)로 가장 많았다. 결론: 난소출혈은 비교적 흔한 질병으로 심한 동통과 함께 때로는 생명을 위협하는 다량의 혈복강을 동반하므로 가임기 여성의 다른 급성복증과 신속하고 정확하게 감별 진단을 하여 적응증이 된 경우는 조기에 수술적 치료를 하여 합병증을 예방하고, 미량의 출혈인 경우는 불필요한 개복수술을 하지 않고 관찰하거나 보존적 치료를 하여야 한다. Objective : Ovarian hemorrhage in a woman of reproductive age is often confused with other surgical emergencies such as acute appendicitis and ectopic pregnancy because there are no typical symptoms and signs that will make definitive diagnosis possible. The authors analyzed 101 cases of ovarian hemorrhages with the purpose of obtaining rapid and precise diagnosis and appropriate treatment. Methods : We analyzed 101 cases of ovarian hemorrhages at the Department of Obstetrics and Gynecology at Dae Rim Saint Mary's Hospital from 1993 to 1999. This analysis includes 96 preexisting cases involving finalized successful surgical treatment and 5 inpatient cases involving conservative treatment. We examined age, parity, clinical features, elapsed days of cycle, histopathologic findings, and operative methods.Results : Mean age of occurrence was 26.3 years, and 57.4% of the cases occurred in nullipara. 64 cases involved the right ovary, and 18 cases were associated with paracoital injuries. The onset of symptoms occurred most frequently between the 20th and 30th days of the menstrual cycle. The histopathologic findings were corpus luteum cyst(30.7%), corpus luteum(24.8%), follicular cyst(14.9%), and ovarian pregnancy(8.9%). The most common type of operation is ovarian cystectomy or ovarian wedge resection(61.4%).Conclusion : Ovarian hemorrhage is a relatively common disease which is accompanied by severe abdominal pain and often life-threatening surgical conditions. Therefore, differential diagnosis should be performed rapidly and precisely from other acute abdomens in a woman of reproductive age. Surgical management should be performed rapidly if indicated. If ovarian hemorrhage is minimal, it can be managed by observation or conservative treatment.
도전성 카본블랙/PVdF 복합재의 제조 및 전기적 특성
김명찬 ( Kim Myeong Chan ),문승환 ( Mun Seung Hwan ),임재석 ( Im Jae Seog ),함현식 ( Ham Hyeon Sig ),박홍수 ( Park Hong Su ),김명수 ( Kim Myeong Su ) 한국유화학회 2003 한국응용과학기술학회지 Vol.20 No.3
N/A Electrical properties of carbon filler/PVdF {poly(vinylidene fluoride)}composite were investigated as a funtion of carbon filler/PVdF ratio in the range of 0.2~0.5. Three kinds of comercialzied conductive carbon blacks such as Hiblack 41Y, KE300J, and KE600J, and carbon nanofibers prepared by the catalytic chemical vapor deposition of C_(2)H_(4) over Ni-Cu catalysts were in the range of 0.65 to 13.5 S/cm depending the fillers` electrical conductivity ranging from 5.6 to 23.1 S/cm. Among the carbon fillers used, the KE600J carbon black showed the highest conductivity both in the composite and filler itself because of its high degree of graphitization due to the high-temperature thermal treatment and its high surface area due to the activation treatment.
2017년 제주시 대기 중 PM<sub>2.5</sub>의 화학적 조성과 오염원 추정
김수미 ( Su-mi Kim ),김길성 ( Kil-seong Kim ),현성수 ( Sung-su Hyun ),김정하 ( Jeong-ha Kim ),김명찬 ( Myeong-chan Kim ),김봉진 ( Bong-jin Kim ),이기호 ( Ki-ho Lee ) 한국환경분석학회 2018 환경분석과 독성보건 Vol.21 No.2
In this study, to characterize chemical compositions and identify the sources of PM<sub>2.5</sub> in the urban area of Jeju, Korea, PM<sub>2.5</sub>-bound concentrations of 8 ionic species and 12 elements were measured from samples collected at the downtown area from January to December 2017. Positive matrix factorization (PMF) was applied to these PM<sub>2.5</sub> data-sets to identify the diverse sources in Jeju City. The average PM<sub>2.5</sub> mass concentration for the study period was 18.31±9.72 μg/m<sup>3</sup>. The contributions of water-soluble ionic species, elements and unknown components to PM<sub>2.5</sub> mass were 55.8%, 2.1%, and 42.0%, respectively. PMF analysis showed that a total of six source types were identified to be important. These sources are the industry related source, secondary sulfate and oil combustion, soil, biomass burning and vehicles, secondary nitrate, and sea salt.
연구논문 : P2O5로 표면 개질한 활성탄의 특성 및 Bisphenol A의 흡착능
이민규 ( Min Gyu Lee ),김명찬 ( Myeong Chan Kim ),감상규 ( Sang Kyu Kam ) 한국환경과학회 2015 한국환경과학회지 Vol.24 No.11
The surface modified activated carbons (SMACs) were prepared with various P2O5 concentrations using two activated carbons (ACs: waste citrus peel-based activated carbon and coconut-based activated carbon). The characteristics and adsorptivity of bisphenol A (one of phenolic endocrine disrupting chemicals) were compared between ACs and SMACs. The contents of C, H and N of SMACs were similar to those of ACs, but the content of P2O5 for the former increased greatly than for the latter, due to the impregnation of P2O5 into the pores. The specific surface area, total pore volume, average pore diameter and iodine adsorptivity for the former decreased due to the impregnation of P2O5 into the pores, compared to those for the latter. The adsorptivity of bisphenol A for the former were higher than that for the latter, although specific surface area, total pore volume, average pore diameter and iodine adsorptivity for the former were lower than those for the latter.
냉동고등어조미육의 가공에 관한 연구 - 2. 냉동고등어조미육의 저장중 품질안전성
이응호(Eung-Ho Lee),김명찬(Myeong-Chan Kim),김진수(Jin-Soo Kim),안창범(Chang-Bum Ahn),김복규(Bok-Kyoo Kim),구재근(Jae-Geun Koo) 한국식품영양과학회 1990 한국식품영양과학회지 Vol.19 No.2
일시다획성 적색육어류를 이용한 신제품개발에 관한 일련의 연구로써 냉동고등어 조미육의 저장안정성을 살펴보기 위해 본 시제품을 동결저장하면서 저장중 품질안정성에 대하여 검토하였다. 동결저장중 제품의 pH 및 휘발성염기질소의 함량은 약간 증가한 반면, 생균수는 1.5×10⁴~2.0×10⁴/g의 범위이었고, 저장중 감소하였으며, 히스타민함량은 2.45~2.89㎎/100g으로 식품위생학적인 면에서 안전하였다. 동결저장중 과산화물값 및 TBA값을 측정한 결과 sodium erythorbate를 첨가함으로써 지질산화를 효율적으로 억제시킬 수 있었으며 제품의 지방산조성은 16 : 0, 18 : 1, 22 : 6, 18 : 3, 20 : 5 및 20 : 4 등의 조성비가 높았고, 저장중 22 : 6 및 20 : 5의 감소율은 제품 B에서 현저하게 억제되었다. 저장중 제품 모두 유리드립과 가압드립은 증가하였고 염용성질소는 감소하였다. 이상의 화학적 분석 및 관능검사결과로 미루어 보아 제품 모두 저장 120일동안 품질이 안정하게 유지되었으며 제품 B의 품질안정성이 가장 우수하였다. The keeping quality of seasoned mackerel meat products during frozen storage were investigated for the effective utilization of mackerel as a food source. The pH and volatile basic nitrogen(VBN) contents of products revealed a tendency to increase slightly during frozen storage. Viable cell counts(1.5×10⁴~2.0×10⁴/g) and histamine contents(2.45~2.89㎎/100g) were decreased during frozen storage. In fatty acid composition of the products, polyenes such as 22 : 6, 18 : 3, 20 : 4, and 20 : 5 were the main components. From the results of chemical experiments and sensory evaluation, the products could preserved with good quality during frozen storage(-25℃) of 120 days.
P<sub>2</sub>O<sub>5</sub>로 표면 개질한 폐감귤박 활성탄에 의한 Bisphenol A의 흡착 특성
감상규 ( Sang-kyu Kam ),김명찬 ( Myeong-chan Kim ),이민규 ( Min-gyu Lee ) 한국환경과학회 2018 한국환경과학회지 Vol.27 No.11
The adsorption characteristics of bisphenol A (BPA) were investigated using activated carbon based on waste citrus peel (which is abandoned in large quantities in Jeju Island), denoted as WCP-AC, and surface-modified with various P<sub>2</sub>O<sub>5</sub> concentrations (WCP-SM-AC). Moreover, coconut-based activated carbon (which is marketed in large amounts) was surface-modified in an identical manner for comparison. The adsorption equilibrium of BPA using the activated carbons before and after surface modification was obtained at nearly 48 h. The adsorption process of BPA by activated carbons and surface-modified activated carbons was well-described by the pseudo second-order kinetic model. The experimental data in the adsorption isotherm followed the Langmuir isotherm model. With increasing P<sub>2</sub>O<sub>5</sub> concentration (250-2,000 mg/L), the amounts of BPA adsorbed by WCP-SM-AC increased till 1,000 mg/L of P<sub>2</sub>O<sub>5</sub>; however, above 1,000 mg/L of P<sub>2</sub>O<sub>5</sub>, the same amounts adsorbed at 1,000 mg/L of P<sub>2</sub>O<sub>5</sub> were obtained. With increasing reaction temperature, the reaction rate increased, but the adsorbed amounts decreased, especially for the activated carbon before surface modification. The amounts of BPA adsorbed by WCP-AC and WCP-SM-AC were similar in the pH range of 5-9, but significantly decreased at pH 11, and increased with increasing ionic strength due to screening and salting-out effects.