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홍진수(ChinSoo Hong),김창교(Chang-Kyo Kim),이병욱(Byoung-Wook Lee),김경래(Kyoung-Rae Kim) 제어로봇시스템학회 2008 제어·로봇·시스템학회 논문지 Vol.14 No.6
The LGP with nanometer structures resulted in enhancement of optical efficiency. Its fundamental mechanism is to recycle the polarized light via one round-trip through QWP(Quarter-wave Plate) but the maximum efficiency to reach with this method is limited up to 2. To get the larger efficiency than this a LGP with 1D PC( one-dimensional photonic crystal) nanometer-patterned on its top and bottom surfaces is suggested. For its optimum design the computer simulation is performed and suggests a grating that the spatial frequency between adjacent patterns is 500nm, its height 250nm, duty cycle 50%, and its cross section is rectangular. The angles of transmitted light are nearly the same as the results expected from the generalized Snell’s law. Thus the Mathematica code, developed in this experiment, will be applied to designing the optimized LGP. The LGP with nanometer-patterened 1D PC LGP on its both surfces shows the enhancement of transmitted intensity distribution up to 5.7 times.
Face Offsetting Method를 적용한 고체 로켓 모터 그레인 Burn-back 해석 연구
오석환(Seok-Hwan Oh),이상복(Sang-Bok Lee),김용찬(Yong-Chan Kim),차승원(Seung-Won Cha),김경래(Kyoung-Rae Kim),김덕민(Duk-Min Kim),이형진(Hyoungjin Lee),노태성(Tae-Seong Roh) 한국추진공학회 2018 한국추진공학회 학술대회논문집 Vol.2018 No.5
고체 로켓 모터 성능을 계산하기 위해 Face offsetting method를 사용하여 3차원 그레인 burn-back 해석을 수행하였다. 그레인 연소 형상 해석은 표면의 이동을 계산하는 이동 경계면 문제이다. 기존 연구에서는 다양한 이동 경계면 해석 기법이 그레인 burn-back 해석에 적용 되었으나 결과가 불완전했다. 이에 본 연구에선 face offsetting method를 사용한 그레인 burn-back 해석 모듈을 개발 하였다. Face offsetting method는 기존 해석 기법의 장점을 조합하여 강건하고 정밀한 이동 경계면 해석을 수행한다. 해석 결과, face offsetting method가 그레인 burn-back 해석에 유용함을 검증하였다. The 3-Dimensional grain burn-back analysis has been performed using the face offsetting method for calculating the solid rocket motor performance. The grain burning configuration analysis is the moving surface problem that calculate the regression of burning surface. In the previous study, various moving interface analysis methods has been applied for the grain burn-back analysis but the results are imperfect. In this study, the 3-Dimensional grain burn-back analysis module has been developed using the face offsetting method. which combines the advantage of the existing moving interface analysis for increasing accuracy and robustness. As a result, the face offsetting method has been proved to be efficient for the grain burn-back analysis.
정윤석(Yoon Sok Chung),이현철(Hyun Chul Lee),안광진(Kwang Jin Ahn),이은직(Eun Jig Lee),임승길(Sung Kil Lim),김경래(Kyung Rae Kim),허갑범(Kap Bum Huh),황수관(Soo Kwan Hwang),백인경(In Kyoung Park),이종호(Jong Ho Lee),이영해(Young Hae 대한내과학회 1992 대한내과학회지 Vol.43 No.6
N/A Background: The growth hormone deficient adults have reduced lean body mass and increased fat mass. And growth hormone deficiency leads to other endocrinologic and metabolic alterations. In recent studies, growth hormone replacement therapy improved these endocrinologic and metabolic alterations. Methods: In a placebo controlled trial, we studied the effects of six months treatment of recombinant human growth hormone (rhGH) in 28 adults with GH deficiency, The patients had acquired GH deficiency due to pituitary tumors (13 cases), Sheehan`s syndrome (13 cases), and head trauma (2 cases). They were randomly divided into three groups. The group 1 (10 cases, M:F= 5:5) received 0.06 U of rhGH per kilogram of body weight subcutaneously three times a week at bed time, the group 2 (9 cases, M:F=4:5) received same amout of rhGH daily, and the group 3 (9 cases, M:F=4:5) received placebo. Results; In all three groups the total body weight did not change, whereas lean body mass significantly increased and adipose tissue mass decreased in rhGH treatment groups. The plasma glucose and glycated hemoglobin levels were not increased during rhGH treatment. The bone mineral densities of spines and femurs were not changed. According to computed tomography on two levels (umbilicus and mid-thigh), the mean mid-thigh muscle mass was significantly increased in group 1, while visceral fat mass significantly decreased in group 2. In groups 1 and 2, rhGH slightly increased exercise maximum oxygen uptake, significantly increased exercise rate-pressure product, hand grip strength and back lift strength after rhGH treatment, but the placebo group had not any change. Conclusion: These results suggest that rhGH has various potentially beneficial effects in GH-deficient adults, especially in changing body composition and increasing exercise capacity.
환경시료로부터 미량 페놀류의 분석을 위한 isoButoxycarbonyl 유도체화 분석방법 적용 및 최적화
김협,홍종기,김용화,김경래 한국환경독성학회 2002 환경독성보건학회지 Vol.17 No.1
Eleven phenols including two chlorophenols, eight alkylphenols and bisphenol A were derivatized with isobutylchlomformate to form their isobutoxycarbonyl derivatives. Standard phenol mixture was concentrated for the isebutoxycarbonyl (isoBOC) derivatization and analysed by gas chromatography/mass spectrometry (GC/MS). The recoveries of the derivatization method of alkylphenols, chlorophenols, and bisphenol A were calculated by gas chromatography/mass spectrometry -selected ion monitoring mode using two work-up methods for comparison; shaking and heating method. The linear detector responses were obtained in the concentration range of 5 -400 ng, with correlation coefficients varying from 0.9755-0,9981. Recoveries of the alkylphenols, chlorophenols, and bisphenol A were determined by gas chromatography /mass spectrometry -selected ion monitoring mode using two work-up methods for comparison; the US-EPA method and the isoBOC derivatization method. Eleven phenols in water samples were extracted with dichloromethane and then concentrated. Also, solid-phase extraction (SPE) with XAD-4 and subsequent conversion to isobutoxymbony derivatives for sensitive analysis with the selected ion-monitoring (SIM) mode. The recoveries were 85.1~109.9% and 90.3~126.6% for the US-EPA method and the isoBOC derivatization method, respectively. The method detection limits of bisphenol A for SIM were 0.732 ㎍/ℓ and 0.002 ㎍/ℓ for the two methods above, respectively.
전태원,박익렬,엄우섭,이동기,우재홍,김경래,김은경,서한교,전병환,김광준,정진욱,박성태 서울대학교 체육연구소 2002 서울大學校 體育硏究所論集 Vol.23 No.2
The purpose of this study is to investigate the effect of Soccer playing in Plasma Lipids in Elementary Obesity Student. Subject for this study were consisted of 16 male(exercise group : 8, non-exercise group : 8), who were over 25% of body fat. Exercise group played soccer 3 times per week, one time was 90 minutes. Weight, % body fat, total cholesterol, high density lipoprotein cholesterol, low density lipoprotein cholesterol, triglyceride, c-ratio were measured at three time periods before exercise begin, and 5 and 8 weeks. The results were summarized as follow: Exercise group decreased significantly more than non-exercise group about weight, % body fat, total cholesterol, low density lipoprotein cholesterol, triglyceride, c-ratio. And Exercise group increased significantly more than non-exercise group about high density lipoprotein cholesterol. In conclusion, the regular aerobic exercise(soccer playing) for 10 weeks has great effects on control of serum lipid which is related to the increase well-being(reduced coronary heart disease, hyperlipidemia, hypertension, obesity et all.) in elementary obesity male student.
김은숙,허갑범,이현철,임승길,이은직,송영득,남수연,문윤재,김인재,나상규,김경래 대한내분비학회 1997 Endocrinology and metabolism Vol.12 No.3
Backbround: Primary empty sella syndrome(PES) is thought to arise from an incompetent diaphragma allowing progressive herniation of arachnoid membrane with secondary compression and atrophy of the pituitary gland. As a consequence of the improvement and widespread use of neuroradiological techniques, such as computerized tomography(CT) and magnetic resonance imaging(MRI), empty sella is more frequently disclosed. The aim of this study is to assess the associated clinical characteristics and endocrinologic disturbance in empty sella syndrome. Methods: From January 1986 to June 1996, 171 patients with empty sella syndrome have undergone analysis for clinical characteristics and associated disease. Result: In our study, PES was diagnosed in 131 of the 171 patients(77%). Primary empty sella syndrome was frequent in middle aged women(female:male 115:16, mean age: 50.6+12.6 years). The common clinical features were headache(80.2%), obesity(72.5%), and hypertension(27.5%). Most of patients with PES have normal pituitary function(75%). The frequent pituitary dysfunction was hyperprolactinemia in PES(21%). Partial and total emptiness of sella on sella CT or MRI were in 111(84.7%) patients, and in 20(15.4%) patients, respectively. The most common associated disease with empty sella syndrome was pituitary adenoma. Conclusion: PES should be considered as a possible cause in obese middle aged women with unexplained headache. The combined pituitary function test should be considered for evaluation of pituitary dysfunction when clinically suspected. (J Kor Soc Endocrinol 12:386-392, 1997)