3상농형 유도전동기 회전자의 자기적 불평형에 관한 연구

이상일,정수복,구희상 조선대학교 에너지.자원신기술연구소 1999 에너지·자원신기술연구소 논문지 Vol.21 No.2

An analytical solution is formulated to predict the torque generated in a cage induction motor when then rotor becomes eccentric. The formulation uses an impedance matrix to calcualte the currents flowing in the stator windings and the rotor bars. With a knowledge of these currents, the generated torque can be obtained. The solution is then illustrated using a 4㎾ two-pole motor. The results were as follows; At low values of eccentricity (less than 40%) the dorp in peak torque is shown that the motor could become locked in an asynchronous torque dip when highly eccentric. At high values of eccentricity the model become inaccurate though it illustrated the general trend of decreasing torque with increasing eccentricity. Also, it is shown that the motor could become locked in an asynchronous torque dip when highly eccentric.

Corticosteroid의 局所 塗布가 멜라닌 및 멜라닌 細胞에 미치는 影響에 關한 實驗的 硏究

李順福,金秀男 고려대학교 의과대학 1980 고려대 의대 잡지 Vol.17 No.1

Conflicting results have been reported as to whether or not the melanogenesis is influenced by topical application of corticosteroids on the skin of human and animals. In animals study, mealnogenesis was observed macroscopically when using natural corticosteroids. In human studies, the reports were based on the observation of complications in use of topical corticosteroids on inflammatory skin conditions and disorders of pigmentation such as melasma and vitiligo. The author observed hyperpigmentation of the normal skin around the lesions of vitiligo during the use of topical synthetic corticosteroids. The present studies were undertaken to evaluate the effects of topical Fluoinoclone on melanogenesis with and without the use of ultraviolet light as observed on the skin of colored rabbits' external ears. The changes of the skin color were observed macroscopically and microscopically after the daily topical application of Fluocinolone with or without daily irradiation of ultraviolet light (wave length : 2537-3660Å, lamp to target distance: 30㎝, exposure time : 5minutes). To observe the microscopic findings, the skin specimens which were taken at 7 day intervals for 28 days were stained with DOPA, silver nitrate and hematoxylin-eosin respectively. The results were as follows: 1. There were no macroscopic or microscopic changes of melanin or melanocytes in the control group which had been applied with cream base daily for 28 days. 2. In the ultraviolet irradiated group mild increments of melanin were observed on the 7th day of the experiment. These increased moderately or prominently on the 14th day and on the 21th day. The degree of increments decreased thereafter. Enlargement of meannocytes was paralleled with the increase in increments of the melanin. Proliferation of melanocyes was observed from mild to moderate degree until the 21th day of the exmperiment, but these decreased after that time. 3. Mild increments of melanin were observed on the 7th day of the experiment in the 0.01% Fluocinolone applied group and on the 14th day in the 0.025% Fluocinolone applied group. These increased moderately in the first group and prominently in the second group one week later. The following week, the degree of increments decreased mildly, but did not change thereafter. The enlargement of melanocytes was similar to the increase in increments of melanin. Mild proliferation of melanocytes was noted on the 14th day. This increased moderately one week later, but was not changed after that. There were no differences in the increments of melanin or in the size and number of melanocytes in response to the various concentrations of the applied creams. 4. The increments of melanin were observed mildly on the 7th day of the experiment and moderately on the 14th day in the 0.01% and 0.025% Fluocinolone applied groups with the additional irradiation of ultraviolet light. There was no change after the 14th day. The change in size of melanocytes was similar to the increase in increments of melanin. Mild proliferation of melanocytes was noted on the 14th day of the experiment. This increased moderately on the 21st day with no further change. There were no differences in the increments of melanin or the size and number of melanocytes observed in the use of concentrations of the applied creams. Above findings suggest that topical Fluocinolone has enhancing effect on the synthesis of melanin and prolong the effect of irradiation of ultraviolet light.

건드릴가공의 절삭성에 대한 연구〔Ⅰ〕

李守鍾,鄭英得,朴相福 釜山工業大學校 1990 論文集 Vol.32 No.-

Gundrilling is a key process in deep hole machining which for example, occupye 20~30 percentage on the mild die machining. Recently, according to popularization of NC machine and machining center, Gundrilling's high efficient processing is powerfully required. This paper deal with enperimental research on the machinahility of gundrilling. We obsersed on the cutting power and variety of machined hole diameter in case various materials such as SM20C SM45C SUS304 and gundrill's configurations and cutting oil. The main results are obtained as follows : 1. Machining torque and thrust are well approached MILTON C, SHAW'S theorectical eq. at feed range 0.015~0.02mm/rev. 2. Total machining condition is good at feed range 0.015~0.02mm/rev. 3. Mean hump ratio is founded 1.47~16 in torque 1.03~2.27 in thrust. 4. When gundrill's cutting angle is near 30。-20。removal chip is normally formed.

동남참게, Eriocheir japonicus (De Haan)의 種苗生産에 關한 生物學的 基礎硏究 : 3. Physiological Study of Osmolality of the Body Fluid and Oxygen Consumption of the Larvae 3. 幼生의 體液 渗透質 濃度 및 酸素 消費에 關한 生理學的 硏究

李福奎,權晉洙 동의대학교 기초과학연구소 1994 基礎科學硏究論文集 Vol.4 No.1

Ion concentrations and osmolalities of the body fluid and oxygen consumption of the larvae of the freshwater crab, under the influence of various salinities and water temperatures were studied. The level of Na^+ and Cl^- ions in the body fluid of the crab placed in the low salinities (freshwater and 30% seawater) were higher at the low temperature(16℃) than high temperature (30℃). However, the crab in the high salinity (90% seawater), those ions in the body fluid were higher at the high temperature (30℃) than the low temperature (10℃). When the zoea larvae were young (first and second stages), the ion concentrations of the body fluid were more affected by salinities and temperatures of the media. The salinity levels of the media more influenced the levels of K^+ ions of the body fluid of the larvae than the temperature. The osmolalities of the body fluid of the larvae was almost isotonic when they were place at 70% seawater (24.5‰). Oxygen consumption of individual larva was lower in zoea 1 and 2 stages than the other stage larvae. The high oxygen consumption of the larvae was observed at 70% seawater compared to the other salinity levels.

대게 Chionoecetes opilio (O. Fabricius)의 난발생 및 부화 유생의 형태

이복규,임영수,이종관,허성범 동의대학교 기초과학연구소 1999 基礎科學硏究論文集 Vol.9 No.1

This paper documented mophological changes of embryonic development and first zoea larvae of snow crab, Chionoecetes opilio. Female crabs were sampled by the Danish seine fishery at the depth about 200m in Sep. 1997 in the eastern coast of Korea. Female with newly berried eggs was reared at the water temperature of 5℃ till the time of hatching. The results obtained are as follows. Embryonic development : According to morphogenesis of fertilized eggs, the developmental process of the embryo was classified into the following seven stages : First stage (cleavage and blastula stage, 24 days) Second stage (gastrula stage, 72 days) Third stage (nauplius stage, 22 days) Fourth stage (metanauplius stage, 57 days) Fifth stage (stage of a pigmentary deposit in the compound eye, 30 days) Sixth stage (chromatophore appearance stage in maxillipede, 56 days) Seventh stage (hatching stage, 36 days) Larvae hatched as prezoeas and they molted to first zoea in about an hour. The first zoea is 4.6 to 5.1 ㎜ in length, 3.2∼3.6 ㎜ in width. The abdomen consists of five segments and a bifurcate telson.

수영지능 향상을 위한 육상 트레이닝법에 대한 고찰

이유복 / 김수균 공주교육대학교 초등연구원 1979 公州敎大論叢 Vol.15 No.-

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스퍼터로 제작된 WO₃박막의 CMP 광역평탄화 특성

이우선,고필주,최권우,정수복,최창주 조선대학교 에너지.자원신기술연구소 2003 에너지·자원신기술연구소 논문지 Vol.25 No.2

Chemical mechanical polishing (CMP) process has been widely used to planarize dielectric layers, which can be applied to the integrated circuits for sub-micron technology. Despite the increased use of CMP process, it is difficult to accomplish the global planarization of in the defect-free inter-level dielectrics (ILD). We investigated the performance of WO₃ CMP used silica slurry, ceria slurry, tungsten slurry. In this paper, the effects of addition oxidizer on the WO₃ CMP characteristics were investigated to obtain the higher removal rate and lower non-uniformity.

大型 淡水産새우, Macrobrachium rosenbergii (De Man)의 生殖生理에 관한 硏究 : 수새우 생식기관과 정포의 형태 Structure of Male Reproductive Organ and Spermatophore

이복규,김병기,권진수 동의대학교 기초과학연구소 2000 基礎科學硏究論文集 Vol.10 No.1

In the giant freshwater prawn Macrobrachium rosenbergii, the paired tests were united by the testes bridge in a H-shape. During mating male discharged two hemispermtophores from right and left genital pore and they were joined and formed a compound spermatophore in peach shape. Hemispermatophore was considered to be produced at proximal and middle vas deferens region. The compound spermatophore consisted of an eosinophilic inner matrix, a basophilic outer matrix and paired sperm mass burried in the basophilic matrix. The size of compound spermatophore was 6.4∼9.3 mm in length and 2.4∼5.1 mm in width regardless of carapace length. After the spermatophore was deposited on female's ventral sternum behind of 5th pereiopod, it was moved to the ventral surface of 3rd and 4th pereiopods by means of the beating of male's 1st and 2nd pleopods.

당밀의 첨가가 갈근탕박 사일리지의 품질과 산양의 기호성에 미치는 영향

김성복,문계봉,이봉덕,오홍록,배형철,이수기 충남대학교 농업과학연구소 2006 농업과학연구 Vol.33 No.1

Two experiments were conducted to investigate the effects of molasses supplementation to silage materials in ensiling Galgeuntang (herbal medicine) meal on the quality of silage, and its palatability in Korean native goats. In experiment Ⅰ, molasses was added at the levels of 0, 0.5, and 1.0% to Galgeuntang meal with three replicates per treatment. In experiment Ⅱ, three 1.5-yr-old Korean native goats were used to measure palatability. In experiment Ⅰ, lactic acid contents in molasses treatments were significantly(p<0.05) higher, and pH and butyric acid contents were lower than those of non-molasses treatment. In addition, molasses treatment increased total microbial cell counts in MRS medium for lactobacillus, but decreased total microbial cell counts in PDA medium for fungi. Molasses supplementation to silage materials increased in vitro dry matter disappearance. Molasses supplementation tended to increase silage intake in Korean native goat (experiment Ⅱ), but the difference was not significant(p>0.05). It is concluded that molasses supplementation to silage materials in ensiling herbal medicine meal could improve its preservability and palatability, the higher the better.

한국의 영어교육에 관한 역사적 고찰과 전개방향에 관한 연구

이복희,여도수 공주영상정보대학 2001 논문집 Vol.8 No.-

우리나라의 초기 영어교육 동기는 외국과 조약을 체결해야 하는데 역관이 필요했다는 점에 착안한 역관양성이란 실용적인 이유 때문이었다. 이렇게 시작된 영어교육은 관에서 주도하는 관 주도형과 미국 선교사들이 주도하는 선교사 주도형 등 두 갈래로 발전했다. 관 주도형 영어교육은 정치적인 변화와 소용돌이가 너무 극심했다는 점, 근대식 학교에 대한 경험부족, 입학자격의 제한, 학생과 주도 관청 모두 공히 역관양성이란 실용적 목표에만 치중했던 점 등등의 이유로 그다지 오래가지 못하고 학교자체가 영속성을 지니지 못 했다. 반면에 선교사 주도형 학교들은 입학자격의 개방화로 근대식 학교를 운영할 줄 아는 서양인들이 종교적 회생정신에 바탕을 두고 꾸준히 발전하여 한국근대 영어교육 토대를 마련할 수 있었다. 관 주도형이나 선교사 주도형이나 공히 Native speaker에 의한 직접식 교수법을 중심으로 교육이 이루어졌다. 이 때부터 현재까지 영어교육이 지속적으로 중단 없이 발전해 왔다면 우리 영어교육은 상당한 수준에 도달했겠지만, 영어교육 태동기를 겨우 넘긴 상태에서 조선은 일제 식민지가 되었고, 일본은 영어를 허용하지 않은 것은 물론 한국어마저 허용치 않고 일본어만 강요했던 것이다. 이렇게 해서 영어교육은 한국어와 마찬가지로 암흑기에 빠지면서 초기 영어교육은 계속성을 잃고 중단되고 말았다. 1945년 광복과 함께 일본이 물러가고 미군이 한국에 들어온 후부터 중단되었던 영어교육이 재개되었으며, 미국의 원조로 교과서를 출판하기도 했다. 광복이후 한국 영어교육 변천은 1차 교육개정에서 출발하여 현재 7차 교육과정에까지 이르렀다. 이를 살펴보면 대체로 문법교육에서 회화중심 교육으로 바뀌어가고 있음을 알 수 있다. 가장 보편적으로 쓰인 교수방법은 80년대 초반까지도 구태의연한 문법·번역식 이였으며 1987년 개정된 5차 교육과정에서 비로소 의사소통능력 개발을 강조하는 방향으로 교육목표가 바뀌었다. 1992년에 다시 개정된 6차 교육과정에서는 학생중심의 교육, 의사소통능력의 배양을 중시하는 교육이 반영되는 등 그 지도목표 및 방법이 구체적으로 설정되게 되었다. 그리고 2001년부터 중·고등학교에 단계별로 실행될 7차 교육과정에서 고등학교 영어 선택교과는 학교선택이 아닌 학생선택이 되도록 하여 학생이 필요로 하는 과목을 선택하여 집중적으로 학습할 수 있도록 하였다. 그래서 더욱 학생중심의 교육을 확고히 하고자 한 듯하다. 이렇게 한국 영어교육이 발전적이고 체계적인 교육개정이 이루어져 왔음에도 불구하고 크게 효과를 보지 못한 것은, 과밀학급, 대입시험을 위한 입시경쟁, 교육시설의 부족 등과 같은 많은 제약점이 있기 때문이다. 앞으로 세계적인 인재교육을 위한 우리의 실정에 맞는 영어교수·학습이론을 발전시키기 위해서 장기적인 계획과 다양한 연구가 필요하다고 하겠다.