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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.
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.
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
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.
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.
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.
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.
냉동고등어 조미육의 가공에 관한 연구 - 1. 냉동고등어 조미육의 가공 및 저장중 정미성분의 변화
이응호(Eung-Ho LEE),김명찬(Myeong-Chan KIM),김진수(Jin-Soo KIM),안창범(Chang-Bum AHN),주동식(Dong-Sik JOO),김세권(Se-Kweon KIM) 한국식품영양과학회 1989 한국식품영양과학회지 Vol.18 No.4
고등어를 효율적으로 이용하기 위하여 각종 조리재료 및 식품가공용중간소재(中間素材)로 이용할 수 있는 고등어냉동조미육의 가공조건을 검토하고 저장중의 정미성분의 변화에 대하여 조사하였다. 고등어냉동조미육을 가공하기 위하여 고등어육을 채육한 다음 육에 대하여 물 및 분리대두단백질로 만든 유화커어드 32.1%, 식염 0.5%, 설탕 2.0%, sodium bicarbonate 0.4%, polyphosphate 0.2%, monosodium glutamate 0.2% 및 양파가부 0.3%, 마늘가루 0.1%, 생강가루 0.1%, 대두단백질 3.0% 그리고 저장중의 지질산화를 방지할 목적으로 sodium erythorbate를 0.1% 첨가하여 잘 혼합한 후 -35℃에서 동결시켜 -25℃에서 저장한 것이 좋았다. 고등어냉동조미육의 수분함량은 70.8-71.7%, 조단백질 13.8-14.7% 조지방 10.9-11.4%였다. 제품B의 총유리아미노산함량은 1625.0㎎/l00g으로 원료고동어와 큰 차이가 없었으며, 전제품에서 함량이 많은 유리아미노산으로는 histidine(939.3㎎/100g), lysine(241.4㎎/100g), glutamic acid(167.9㎎/100g), arginine(99.2㎎/100g) 등이었다. 제조직후 모든 제품의 총핵산관련물질함량은 366.5-371.5㎎/100g으로 거의 차이가 없었고 저장중 약간 감소하였으며, 감소폭은 제품(C)가 가장 컸다. 핵산관련물질은 모든 제품에서 IMP가 전체의 약 반을 차지하였다. TMAO, TMA, 총creatinine 및 betaine의 함량은 제조직후 세제품에서 함량이 거의 차이가 없었으며, 저장중의 감소폭은 세제품 모두 거의 비슷하였다. 이상의 유리아미노산, 핵산관련물질, 기타 염기성분의 함량으로 미루어 볼 때 냉동고등어조미육의 맛에 주체적 역할을 하는 것은 유리아미노산이고, 핵산관련물질, 총creatinine, betaine, TMAO 및 TMA는 보조적 역할을 하리라 생각된다. For the effective utilization of mackerel as a food sauce, the processing conditions of the frozen seasoned mackerel meat and the changes in taste compounds during its frozen storage were investigated. To prepare the frozen seasoned mackerel meat, the mackerel was headed, gutted manually, washed with tap water and deboned with the meat seperator. Then it was mixed with additives such as emulsion curd(32.1%, w/w), table salt(0.5%, w/w), sugar(2.0%, w/w), sodium bicarbonate(0.4%, w/w), polyphosphate(0.2%, w/w), monosodium glutamate(0.2%, w/w), onion powder(0.3%, w/w), garlic powder(0.1%, w/w), ginger powder(0.1%, w/w), soybean protein(3.0%, w/w) and sodium erythorbate(0.1%, w/w). This seasoned fish meat was frozen with contact freezer, packed in a carton box, and then stored at -25℃. The moisture and lipid contents in the products were 70.8-71.7% and 10.9-11.3%, respectively. The taste compounds of the frozen seasoned mackerel meat were free amino acids(1625.0-1692.0㎎/100g), nucleotides and their related compounds(316.6-366.8㎎/100g) as well as total creatinine(270.2-311.8㎎/100g), and small amount of betaine and TMAO. In free amino acids, the predominant ones were histidine, lysine, glutamic acid and arginine. It was supposed from the results that principal taste compounds of frozen seasoned mackerel meat were free amino acids, and that total creatinine, TMAO, TMA and betaine as well as nucleotides and their related compounds also played an assistant role.