커패시터 放電 임펄스 着磁機 및 着磁 요크시스템의 定數算定에 관한 硏究

白壽鉉,金 龍,金必洙,尹秀鳳,朴永浩,尹信容 동국대학교 대학원 1992 大學院硏究論集-東國大學校 大學院 Vol.22 No.-

In a capacitor-discharge impulse magnetizer, a magnet is magnetized by the discharging current of capacitor The actual construction of magnetizing fixtures and discharge matching is expensive and time-consuming. Since the parameters of the impulse magnetizer have been determined and the resistance and inductance of such a magnetizing fixture can be easily computed using FEA, it is possible to predict the performance of such a fixture without actually building it. This paper describes that by mathematically modeling the capacitor-discharge impulse magnetizer fixture the problem can be solved with resonable predictability. The basic equations are presented and used to predict the magnetic-field intensity inside the fixtures. Finite-Element-Analysis is also used as part of the design process

노인의 대사성 증후군의 위험 요인에 체구성, 심폐기능 및 근력과의 상관관계

윤규태,최기수,강현주 순천향대학교 기초과학연구소 2004 순천향자연과학연구 논문집 Vol.10 No.2

We investigated the association of body composition, cardiorespiratory fitness and muscle strength to the metabolic syndrome risk factors in elderly persons. 53 elderly persons aged 65-75 years evaluated the metabolic syndrome risk factors(centeral obesity, high blood pressure, HDL-cholesterolemia, hypertriglyceridemia, hyperglycemia), as defined by the criteria given in the Adult Treatment Panel Ⅲ. In the relation of body composition among the metabolic syndrome risk factors, WC had a positive correlation with weight, BMI, and WHR, and DBP had a negative correlation with WHR,FBG had a positive correlation with weight, BMI, and WHR, and HDL-C had a negative correlation with weight, BMI, and WHR. In the health related physical fitness, WC had a positive correlation with UMS, LMS, and TMS, LMS, and TMS, TG had a negative correlation with VO_(2)max and HDL-C had a positive correlation with VO_(2)max, UMS, LMS, and TMS. This study suggest that the metabolic syndrome risk factors are affected by body composition, cardiorespiratory fitness and muscle strength.

農家所得增大를 위한 보리쌀 消費增大方案에 관한 硏究 : 보리쌀 炊飯特性 硏究를 통한 보리 利用性 提高方案

尹水弘,徐挺植,金尙玉,玄仁煥 영남이공대학 1981 論文集 Vol.10 No.-

This study was carried out as a program to increase the utilization of barley by improving the acceptable eating quality of Korea's traditional cooked barley of a grain type. The barley's characteristics of cooking and acceptable eating quality according to its pearling rate by pearling it differently in the four classes; 70%, 60%, 50%. 45% (as the weight ratio of pearled barley to covered one) were examined extensively including the general compositions of samples, the time course changes of barley's volume and weight in proportion to the soaking before cooking, the experiments of the physiochemical characteristics (the water-uptake ratio and swelled volume of polished barley when cooked, the pII, iodine color intensity and total solids in the residual cooking liquid) and textural properties by the universal testing machine about the cooked barley as a objective testing method of acceptable eating qualities, the sensory evaluation of cooked barley as a subjective testing method of acceptable eating qualities, etc. The results were as follows: 1. According to the decrease of pearling rates, moisture contents and nitrogen-free extracts of samples were increased slightly, but their components of crude protein, crude lipid, crude fibre and ash were decreased greatly 2. In the time-course changes of the capacity of water-uptake and swelling of volume according to the soaking of samples before cooking, the increased weight ratios were increased in proportion to the decrease of pearling rate of barley, but the increased volume ratios were increased according to the order of covered barley, Akibare(rice), 50% pearled barley, 60% pearled barley, 70% pearled barley, 45% pearled, ane especially the volume increases were marked at the early stage of soaking in 70% pearled barley. 3. According to the decrease of pearling rate, water-uptake ratios during cooking were increased, but swelling of volume had the maximum value at 60% pearled barley, decreased again having the minimum value at 45% pearled barley. 4. pH values of the residual cooking liquid of the cooked barley were decreased according to the decrease of pearling rate and were considerably less than the pH, 6.46 of Akibare. The iodine color intensity and total solids of the residual cooking liquid of the cooked barley were increased greatly according to the decrease of pearling rate, but were considerably lower as compared with those of Akibare as a whole. 5. The texture profile of the cooked barley obtained by the universal testing machine were analyzed by the methods of Bourne. Henry etc. Max. force known to hardness, force to 20% compression, compressive gumminess, compressive chewiness were increased according to the order of pearling rate, 60%, 50%, 45%, 70% and recorded the higher values as compared with those of Akibare. Compressive cohesiveness, peak force, tensile hardness, tensile springiness, tensile cohesiveness, tensile gumminess, tensile chewiness were increased according to the decrease of pearling rate of barley and reached the maximum at 45% pearled barley, but recorded the much lower values as compared with those of Akibare. But springiness did not show some differences between the pearling rates or rice and barley polished. 6. According to the results of panel tests about the cooked barley by the hedonic scoring method based on a 5-point scale, color, tasts, appearance, adhesiveness, total acceptability had significant differences between samples at 95% level, but other quality factors did not and there were no significant differences between panel members. The means of total scores increased according to the order of pearling rate. 60%. 70%, 50%, 45%, and therefore it was shown that 45% pearled barley had the best acceptable eating quality.

3단 및 변형 2단 카세트 샘플러의 공기중 수산화나트륨 포집효율의 실험적 연구

윤영식,김치년,김현수,노재훈 한국산업위생학회 2002 한국산업보건학회지 Vol.12 No.1

Sodium hydroxide(NaOH) is one of the chemicals produced great quantity in Korea. It variously uses for acid neutralization, petroleum refining, electroplating, metal cleaning, laundering, bleaching, washing dish, manufacture of paper, etc. NaOH is used in various field of industry but information on the sampling efficiency for NaOH IS seldom provided. The objective of this study was to compare the sampling efficiency of the three-piece cassette sampler with the modified two-piece cassette sampler. The three-pieces cassette consisted of an inlet cover, a spacer, a mixed cellulose ester membrane(MCE) filter, a back-up pad and a bottom. The modified two-pieces cassette consisted of the same parts as a three-piece cassette without a spacer. The whole inner surface of the 2-piece cassette was loaded with MCE filter to ensure that all of the aspirated NaOH. The air sampling of airborne NaOH WAS performed according to the Occupational Safety and Health Administration(OSHA) analytical method manual ID-121 that is used for the method of occupational environment measurement and analysis. Air samplings were per-formed by simultaneous samplings using the three-piece and modified two-piece cassette sampler at the same time and same place in the chemical plants. The significant difference between average adsorbed amounts on the MCE filters of the three-piece and modified two-piece cassette sampler was found. Sampling amounts of the modified two-piece cassette sampler was 1.84 times higher than that of the three-piece casstte sampler(p<0.01). An average 47% of NaOH was collected on the upper (inlet+middle-rim) side of the modified two-piece cassette. As the result of his study, it is verified that the modified two-piece cassette sampler is more effective than the three-piece cassette sampler for collection of airborne NaOH.

고효율 DC/DC컨버터 제작을 위한 동기정류기 도전 손실 해석

윤석호,김용,백수현,김필수 동국대학교 산업기술연구원 1999 산업기술논문집 Vol.14 No.-

최근 반도체 소자의 제조기술 발달로 정보통신기기 등에 사용되는 온보드(on-board) 컨버터의 전원전압은 3.3V 또는 1.5V의 저전압 전원이 사용된다. 이러한 저전압 전원방식은 온보드(on-board) 컨버터의 정류기단 전력손실이 증가하게 되어 시스템의 높은 효율을 얻기가 어렵게 된다. 낮은 전원전압 방식일수록 정류기단에서 전력손실은 더욱 증가하여 컨버터의 효율은 낮아진다. 고전력밀도의 정류기단 구성을 위하여 출력단에 다이오드 대신 MOSFET 자기구동 정류기를 사용한다. 그러나 MOSFET 자기구동 정류기의 전력손실은 2차측 구동전압의 형태나 기생인덕턴스의 영향을 받게 된다. 따라서 불연속에서는 기생인덕턴스에 의한 MOSFET와 쇼트키 다이오드의 도통주기의 변화가 MOSFET 자기구동 정류기의 전력손실에 미치는 영향을 분석하였으며, 그 결과 기생인덕턴스의 크기를 감소시켜 MOSFET의 도통주기를 증가시킴으로써 MOSFET 자기구동 정류기의 전력손실을 최소화하였다. Recently, new trend in telecommunication device is to apply low voltage, about 3.3V-1.5V. However, it is undesirable in view of high efficiency and power desity which is the most important requirement in the distributed power system. Rectification loss in the output stage in on-board converter for distributed power system are constrained to obtain high efficience at low output voltage power supplies. This paper is investigated conduction power loss in synchronous rectifier with a parallel connected Schottky Barrier Diode(SBD). Conduction losses are calculated for both MOSFET and SBD respectively. The SBD conduction power loss dissipates more than the MOSFET rectifier conduction power loss.

제조가 사염화탄소에 의해 유도된 흰쥐의 지질함량에 미치는 영향

윤수홍,김덕현,김준수 한국위생과학회 2001 한국위생과학회지 Vol.7 No.2

사염화탄소(CCl_4)는 가축의 구충제, 용매, 지용성, 비가연성, 비휘발성 세제 및 소화제로 널리 사용되어온 할로겐 화합물^14)로 사람을 비롯한 모든 종에 대하여 간손상을 일으키는 대표적인 약물로 알려져 있다. 사염화탄소의 간장 독작용에 관한 기전은 명확히 규정되어 있지 않으나 alkylating radical을 지닌 간장 독성물질로 규정하는 세포 파괴설^15)로 사염화탄소를 투여하면 cytochrome P450 monooxygenase에 의하여 전자를 공급받아 trichloromethyl free radocal(CCl_3·)로 대사되어 세포내 단백질, 지질 및 기타 거대분자 등과 결합하여 단백질을 불활성화시키거나 효소활성을 감소시키거나^16~19) trichloromethylperoxy free radical(CCl_3OO·)로 산화되어 세포막의 불포화 지방산을 과산화시켜 막의 구조와 기능을 파괴하여 간에서 단백합성을 저해하고^20,21) 간장 glycogen양을 감소시키며, 혈중으로 AST 및 ALT 등의 유출을 일으키고 또한 조직학적으로는 간장조직의 지방변성과 괴사 등을 일으킨다고 알려져 있다.^22,23) 한편 혈액의 분산과 기관지 해소작용 등이 있어 각종 염증 및 기관지 치료에 사용되는 한방약제인 제조을 사용하여 흰쥐에게 사염화탄소를 투여하여 혈청 지질함량에 미치는 영향을 알아보고자 실험을 하였다. 사염화탄소 투여에 의하여 흰쥐 혈청의 지질함량이 전반적으로 증가하였는데 특히 중성지방의 증가가 현저하였으며 증가한 지질함량은 제조 수침액을 투여함으로써 양호하게 감소하였다. 그러나 동맥경화의 중요한 유발인자로 알려진 HDL-cholesterol^24)은 별다른 변화가 관찰되지 못하였다. 결국 흰쥐에게 사염화탄소를 투여함으로써 혈청에서 지질함량과 동맥경화지수가 증가하였으며 이것은 동맥경화증과 관련된 혈관의 순환기 질환 발병의 위험성이 높아진 것이며 제조 수침액은 혈청 지질함량을 감소시킴으로써 이들 질환의 치료가능성이 있다고 할 수 있을 것이다. The purpose of this study was to investigate the effect of Holotrichia diomphalia Bates on serum lipid contents in carbon tetrachloride-treated The water extract of ones was obtained and administrated to rats. The results that lipid contents in serum were increased by intra peritoneal injection of carbon tetrachloride that of control group, but they were significantly decreased by orally administration of Holotrichia diomphalia Bates water extract. But HDL-cholesterol content was not changed and arteriosclcrotic index was increased almost twice in carbon tetrachloride-treated group than in normal group. Therefore, it syggested that Holotrichia diomphalia Bates could be promising agents in a circulatory disorder including arteriosclerosis.

최근 10년간 원광의대병원에서 시행한 소아 심장혈관 수술의 임상적 고찰

윤향석,정수미,최두영,오광수,오연균,김종덕,양현웅,이삼윤,김형곤,최종범,최순호,노병석 圓光大學校 醫科學硏究所 1995 圓光醫科學 Vol.11 No.2

We reviewed 10 years experiences of the clinical aspects and early postoperative results in 544 pediatric patients(age less than 16 years old). Among them. 529 cases had the congenital heart diseases, and 15 had the acquired diseases. Open heart surgery was performed in 413 patients. 115 cases were treated with non-open heart surgery. 16 with interventional catheterization. Annual increase of the cardiac patients was not significant in recent 10 years, except slight increase in 1994. The mean age of the study patients had been evidently changed to younger year by year. Total mortality rate of the open heart surgery was 6.4%. The cyanotic congenital heart diseases were high in early postoperative mortality by 25.7%, whereas 4% in acyanotic group. The age group less than one month was most highest in surgical mortality(66.7%). There were no deaths in patients with patent ductus arteriosus(103 cases), atrial septal defect(83 cases) or pulmonary stenosis(17 cases). Among 220 patients with ventricular septal defects(VSD). 10(4.5%) were died early postoperatively. In cyanotic group, the patients with pulmonary atresia with ventricular septal defects(PAVSD), transposition of the great arteries(TGA), interrupted aortic arch(IAA), complex cardiac anomalies with isomerism seemed to be most susceptible to an early death.

상악 절치부-토크에 의한 치아 이동과 응력 분포에 관한 유한요소법적 연구

윤현주,임용규,이동렬,조영수 대한치과교정학회 2005 대한치과교정학회지 Vol.35 No.2

본 연구는 상악 절치부에 active 토크가 가해졌을 경우, 교정력을 직접 받은 치아와 인접 치아의 반응을 알아보고자 상악 치아 및 치조골의 유한요소 모델을 제작하고, stainless steel, NiTi, TMA 세 종류의 각형 호선을 육면체 요소로 모델링하여 유한요소 모델을 완성하였다. 호선이 브라켓에 삽입되었을 때 브라켓에 발생하는 반력과 모멘트를 구하였고, 이것을 유한 요소 모델에 적용하여 각 치아의 변위와 응력 분포를 측정하였다. 브라켓에 발생하는 반력은 근원심 방향과 협설 방향으로의 힘은 0에 가까우며, 중절치, 측절치, 견치의 브라켓 근심측에서는 정출력이 원심측에서는 압하력이 발생하였다. 힘과 모멘트의 크기는 측절치에서 최대였고, 중절치, 견치 순으로 감소하였고, 소구치 부위와 대구치 부위에서는 급격히 감소하였다. 중절치와 측절치는 치관 협측, 원심 경사 이동과 압하를 보였으며, 견치는 치관 설측 원심 경사와 정출을 보였고, 제1소구치는 치관 설측 경사이동을 보였다. .019×.025 SS을 사용하여 상악 절치부에 토크를 부여하는 경우에는 측절치에 과도한 힘이 집중되므로, 임상에서 토크를 조절할 경우에는 NiTi나 TMA 호선을 사용하는 것이 바람직하리라고 생각된다. The purpose of this study was to investifate the stress distribtion in the periodontal tissue and the displacement of teeth when active torque was applied to the maxillary incisors by three-dimen-sional finite element analysis. A three- dimensional finite element model consisted of the maxillary teeth and surrounding periodontal membrane, .022×.028 Roth prescription bracket and stainless steel. NiTi and TMA rectangular ideal arch wires which were modeled by hexahedron elements. Applied active torques were 2, 5 and 10 degrees. The findings of this study showed that the reaction force acting on the bracket was the extrusion force on the mesial side of the incisors and canine and the intrusion force on the distal side of the incisors and canine.The amount of force and moment was greatest at the lateral incisor. When active anterior labial crown torque was applied, labial crown and distal tipping and intrusion of the incisors took place, and lingual crown distal tipping and extrusion of the canin occured. An excessive force was concentrated on the lateral incisor, when the stainless steel wire was used. NiTi or TMA wire os desirable for torque control.

천연자원을 이용한 간기능 증진제 개발 연구 : Benzo(a)pyrene에 의해 유도된 간기능 장해에 미치는 천궁 추출액의 영향 The Effect of Cnidii Rhizoma on Benzo(a) Pyrene Induced Hepatotoxicity

尹水弘,이송애,하헌,박은주,오관현 대구효성가톨릭대학교 1993 연구논문집 Vol.46 No.1

The present study was undertaken to compare the pharmacological activity of crude Cnidii Rhizoma reported with the clinical uses in the oriental medicine. Crude Cnidii Rhizoma used for the treatment of anemia, body chill, menstural irregularity and menstural pain as hematic tonic effector, sedative, adodyne and clear extravasated blood. Therefore we tested the effects of Cnidii Rhizoma water extract on the liverprotective activities in the rats. The results obtained form liver microsomal enzyme assay, measurement of serum and liver alanine, aspartate aminotransferase and lipid accumulation indicated that Cnidii Rhizoma extract showed significant liver-protective activities against benzo(a)pyrene poisoning.

천연자원을 이용한 간기능 증진제 개발 연구 : Benzo(a)pyrene에 의해 유도된 간기능 장해에 미치는 천궁 추출액의 영향 The Effect of cnidii Rhizoma on Benzo(a)pyrene Induced Hepatotoxicity

윤수홍,이송애,하헌,박은주,오관현 효성여자대학교 부설 한국환경위생연구소 1993 환경위생연구 Vol.3 No.1

민간에서 주로 사용되는 약용식물들 중 간독성 의 발현 저해 및 간기능 보호 효과가 우수한약물을 찾아 임상적인 약효를 밝혀보고자 하는 실험과정으로 탄소화합물의 불완전 연소및 열분해에 의해 생성되는 간장해 물질인 benzo(a)pyrene으로 유도한 rats의 간독성발현에 미치는 천궁 수침액의 예방 및 치료 효과를 실험하여 다음과 같은 결과를 얻었다. 1. 천궁 수침액의 투여는 B(a)P 투여로 현저하게 증가된 혈청 및 간장의 AST, ALT,LDH, ALP 활성을 유의성 있게 감소시켰다. 2. B(a)P 투여로 증가한 혈청 total cholesterol 및 phospholipid 함량은 천궁 수침액의투여로 감소시킬 수 있었으나 그 효과는 현저하지 않았다. 3. 천궁의 투여는 B(a)P에 의한 간독성 발현을 유의성 있게 감소시켰으며 그 효과는전처리가 후처리에 비해 우수하였다. The present study was undertaken to compare the pharmacologicalactivity of crude Cnidii Rhizoma reported with the clinical uses in the orientalmedicine. Crude Cnidii Rhizoma used for the treatment of anemia, body chill,menstural irregularity and menstural pain as hematic, tonic effector, sedative,adodyne and clear extravasated blood. Therefore we tested the effects of Cnidii Rhizoma water extract on the liver-protective activities in the rats. The results obtained from liver microsomal enz-yme assay, measurement of serum and liver alanine, aspartate aminotransferaseand lipid accumulation indicated that Cnidii Rhizoma extract showed significantliver-protective activies against benzo(a)pyrene poisoning.