Hybrid Light‐Emitting Diodes: Electrically Driven Quantum Dot/Wire/Well Hybrid Light‐Emitting Diodes (Adv. Mater. 45/2011)

Ko, Young‐,Ho,Kim, Je‐,Hyung,Jin, Li‐,Hua,Ko, Suk‐,Min,Kwon, Bong‐,Joon,Kim, Joosung,Kim, Taek,Cho, Yong‐,Hoon WILEY‐VCH Verlag 2011 ADVANCED MATERIALS Vol.23 No.45

<P>Electrically driven hybrid light‐emitting diodes (LEDs) consisting of quantum dots, wires, and wells based on the nanometer‐sized pyramid GaN structure are reported by Taek Kim, Yong‐Hoon Cho, and co‐workers on page 5364. The LEDs exhibit mixed emissions from InGaN quantum dots, wires, and wells formed at the tops, edges, and sidewalls of the pyramids, respectively. The hybrid LEDs containing low‐dimensional quantum structures provide a broad‐band, highly efficient visible lighting source. </P>

PWM 전력 컨버터를 이용한 배전용 무효전력 보상기 제어

고지호,김용현,김재홍,김일환 濟州大學校 産業技術硏究所 2000 산업기술연구소논문집 Vol.11 No.1

This paper presents the control method of reactive power in distribution system using PWM power converter. The PWM power converter controlled by space vector PWM method is voltage source type using IGBT switching device. Using the Park's transformation, three phase load current can be written in terms of component α and β current in a synchronously rotating reference frame. Two axis. the direct axis. α. and the quadrature axis. β, mean the active and reactive component in load current. Also. two components appear as de quantities in that frame. So it is easy to control the reactive power by controlling the d axis currents. And in accordance with the change of reactive power in load side. PWM power converter compensate the reactive power by generating the reactive current to the load side using PI control. To verify the theoretical analysis. results of computer simulation and experiment are presented to support the discussion

Clamp의 構造가 網사의 强度變化에 미치는 影響

高冠瑞,許龍虎 釜山水産大學校 1976 釜山水産大學 硏究報告 Vol.16 No.1

The strength of netting twine is the most important problem in choice of netting material for fishing gear construction. However, the strength of netting twine is influenced ascribe to the plied yarns, the number of twist, the balance of under and upper twist, the testing time, temperature, humidity and the construction of loading clamps, etc. It is common fact that the test result is disregarded and an additional test is performed if the test specimen slips in the clamps of the testing machine, or breaks in or at the edges of the clamps, or if the result appears to be different from other results in the test as a consequence of unusual or irregular faults in the material. In order to compare the reciprocal differences concerning strength, sheave-shaped special clamps are used instead of plane-shaped clamps which are supplied with the testing machine. And also load-elongation curves of the netting twine and the tuna long line are analyzed. The netting twine of PE indicates 24mm-32mm extension at break after maximum point which is 50kg-70kg higher than the breaking strength, while the other materials coincide the maximum point with the breaking point. Furthermore, some attempts have also been made to study preference shown to breaking strength by the 3 kinds branch line of the tuna long line made of PES and PVC dissimilar components rope. The strengths show 247.3kg, 26.0kg, 307.8kg, respectively, in spite of discontinuous fibers are included in the surrounding PES with PA dissimilar components rope, indicating highest strength.

PWM 전력 컨버터를 이용한 배전용 무효전력 보상기 제어

고지호,김용현,김재홍,김일환 제주대학교 산업기술연구소 2000 尖端技術硏究所論文集 Vol.11 No.1

This paper presents the control method of reactive power in distribution system using PWM power converter. The PWM power converter controlled by space vector PWM method is voltage source type using IGBT switching device. Using the Park's transformation, three phase load current can be written in terms of component α and β current in a synchronously rotating reference frame. Two axis, the direct axis, α, and the quadrature axis, β, mean the active and reactive component in load current. Also, two components appear as dc quantities in that frame. So it is easy to control the reactive power by controlling the d axis currents. And in accordance with the change of reactive power in load side, PWM power converter compensate the reactive power by generating the reactive current to the load side using PI control. To verify the theoretical analysis, results of computer simulation and experiment are presented to support the discussion

수중불분리 콘크리트의 제강도 특성에 관한 실험적 연구

고용득,송재호,장일영,이승원 金烏工科大學校 1996 論文集 Vol.17 No.-

The purpose of this experimental study was carried out for the estimate of the properties of underwater non-segregation concrete. Properties of antiwashout underwater concrete is different from other type of concrete and the selection of cement types is greatly dependent on the structural requirement and construction location associated with control compressive strength and modulus of rupture Based on this, this study addresses the comparison of physical properties of concrete according to the use of different cement types. It is also recommended to select a proper cement type depending ton structural characteristics. Rational analytic formula for the modulus of rupture is to predicted from compressive strength of concrete cylinder.

자궁 경부에서 발생한 상피내 암종과 침윤성 암종의 간질 변화에 관한 병리조직학적 연구

고성민,노광을,이민전,김용임,이미자,전호종,서재홍 조선대학교 1993 The Medical Journal of Chosun University Vol.18 No.2

Connective tissue seems to be involved in malignancy by lytic processes as a crucial element in invasive growth. This looks relatively simple, but data have emerged that the stroma is not just a passive but rather an active participant. Recent advances in the borderland between cancer and connective tissue research have increasingly made it clear that the relationship between malignant tissue and its stroma is a very intricate one. The present study was performed in order to investigate the variety of stromal reactivity and alterations of basement membrane accompanying malignant growth and the distribution of Langerhans cells and T and B lymphocytes in cervical epithelium affected by intaepithelial neoplasia and invasive cervical carcinoma. The subjects in this were 14 cervicitis, 42 cervical intraepithelial neoplasia, 14 microinvasive cervical carcinoma and 14 invasive cervical carcinomas. A total of 84 formalin-fixed and paraffin-embedded specimens of normal, inflamed and neoplastic uterine cervix have been studied in order to correlate the epithelial changes with the expression of α-smooth muscle actin, S-100 protein, α_1-antichymotrypsin, lysozyme, LCA, CD20, UCHL1, OPD4, CD1, CD4, CD8, CD68 and typeⅣ collagen in stroma. The results of immunohistochemical and electron microscopical examinations yield virtually identical findings 1) The number of α-smooth muscle actin positive cells and the intensity of stain were related to the increasing grading of cervical intraepithelial neoplasia and invasive cervical carcinoma. 2) Normal cervix and cervical intraepithelial neoplasia grade Ⅰ and Ⅱ showed continuous basement membrane but invasive cervical carcinoma showed highly variable basement membrane deposition ranging from continuous to almost completely absent. 3) The cervical intraepithelial neoplasia Ⅲ and invasive cervical carcinoma showed an increase in spindle shaped Langerhans cells associated with increased numbers of stroma and intraepithelial lymphoid cells. The evaluation of collagen Ⅳ in basement membrane, S-100 protein and CD1 in Langerhans cells and α-smooth muscle actin in stromal cells of the uterine cervix may be an useful adjunct to diagnostic criteria of cervical intraepithrlial neoplasia and invasive cervical carcinoma, and may help understanding of the mechanisms of mesenchymal epithelial interactions during neoplasia.

야생차의 생육특성에 관한 연구

고영옥,이종옥,최주호,정영섭,이용호 진주산업대학교 농업기술연구소 2003 農業技術硏究所報 Vol.16 No.-

본 시험은 최근 각광 받고있는 차나무의 우량품종 육성과 재배에 관한 기초자료를 구명코자 2001년 3월부터 2002년 10월까지 남부지방 자생차의 지리적·생태학적 특성 조사와 RAPD 유연관계를 비교 분석하였으며 그 결과는 다음과 같다. 1. 녹차 자생지 토양의 pH는 4.1 ~ 6.2로 내대리가(pH 6.2) 가장 높았으며, 다사리가 pH 4.1로 가장 낮았다. 2. P_(2)O_(5)는 농업기술원과 다솔사 차가 319㎎/㎏ 이상으로 가장 높았고, 송광사와 다압리는 20㎎/㎏ 이하로 가장 낮았다. 3. 차 포장의 지형은 혜산서원, 농업기술원을 제외한 대부분 자생지가 해발 220m 이상의 산간지 였으며, 북서풍을 막을 수 있는 남향 또는 남서방향이었다. 4. 순천시 송광사, 사천시 배방사, 다솔사, 밀양시 혜산서원, 고성군 옥천사, 남해군 보리암 차엽은 yabukita 보다 대엽이었다. 5. 엽장은 다솔사가 13.9㎝로 가장 길었고 도심다원은 5.2㎝로 가장 짧았으며, 엽폭은 배방사가 4.9㎝로 가장 넓었으며 매암다원이 2.1㎝로 가장 좁았다. 6. 거치수는 배방사가 79개로 가장 많았으며 천은사가 50개로 가장 적었다. 7. 증폭된 DNA의 band pattern을 비교해 보면 절편 크기는 300~3000bp사이였고, 지역별 band 영상은 뚜렷하였다. 8. Primer별 평균 band수는 7.6개였으며, 22개 Primer당 전체 band 수는 76~192개 범위였다. 9. RAPD UPGA에 의한 유연관계 분석을 위한 similarity matrix값에 근거하여 유연성 분석을 실시한 결과 차가 유전적 거리지수 0.10이내에 우선적으로 유집되었으며, 고성군 옥천사, 밀양시 혜산서원, 엄광사 수집종은 0.25의 유전적 거리지수로 유집되었으며 모두 대엽이었다. This study was carried out to investigate the geographical and ecological characteristics of self-sown teas in the southern southern part of South Korea and evolutionary relationship based on the RAPD analysis data. Each sample was collected from March, 2001 to October, 2002 along with basic characteristics of its cultivation. The results are described as follow : 1. The pH of soils in the habitat of collected green teas were 4.1~6.2. The highest pH(6.2) was shown from the soil of Naedae-ri while that of Dasa-ri showed the lowest pH value. 2. The highest content (319㎎/㎏) of P_(2)O_(5) was examined from the tea of the Agricultural Research Extension Services (ARES) while the lowest values were obtained from the collected samples of Shonggwansa and Dasa-ri (20mg/kg). 3. In terms of geographical aspects, most of the areas that samples were collected are mountains with 220 meters above the sea level and are in the direction of the southern exposure and the southeast except Hyesan lecture hall and ARES.4. In Shonggwangsa of Shunchon-si, Baebangsa and Dasolsa of Sacheon-si, Hyesan lecture hall of Miryang-si, Okcheon-sa of Goseong-gn and Boriam of Namhae-gn, the self-sown teas were a kind of bigger size of leaf than that of Yabukita. 5. The tea of Dasolsa had the longest leaf of 13.9㎝, but the tea of Dosim tea plantation had the shortest leaf of 5.2㎝. Baebangsa showed the broadest leaf width of 4.9㎝, and Maeam tea plantation showed the narrowest leaf width of 2.1㎝. 6. The tea of Baebangsa had 79 serrations of the largest number but Cheoneunsa had 50 serrations of the smallest number. 7. When the band pattern of the amplified DNA by PCR were compared, a size of the bands was between 300 and 3,000bp. The band image by area of gathering seeds was distinct. 8. There were the average number of 7.6 bands per primer. The number of total bands per 22 Primers were between 76 and 192 bands. 9. The result values of a flexibility analysis based on a similarity matrix value for the flexible relation analysis by RAPD UPGA, were attracted within 0.10 of inherited distance index. The collected species in Okcheonsa of Goseong-gn, Hyesan lecture hall and Eomgwangsa of Miryang-si were attracted within the inherited distance index of 0.25 and were all the kind of the big leaf.

머리부분에 과량의 방사선을 조사받은 흰쥐 위점막 벽세포의 미세구조 연구

김용식,고정식,양남길,안의태,박경호 순천향의학연구소 1995 Journal of Soonchunhyang Medical Science Vol.1 No.2

본 실험은 머리부분이 많은 양의 방사선에 노출되었을 때 위점막 벽세포에 나타나는 미세구조적 변화를 관찰하기 위하여 시행하였다. 실험동물로는 체중 200-250g의 건강한 숫흰쥐를 사용하였으며, 이를 정상군과 실험군(방사선 조사군)으로 나누었다. 실험군은 3,000 rad조사군과 6,000 rad조사군으로 구분하였으며, 방사선 조사후 6시간, 2일 및 6일후에 희생시켰다. 실험군은 sodium thiopental로 마취시킨후 치료방사기(Mitsubishi Linear Accelerator ML-4MV)를 사용하여 머리부분에만 분당 200 rad씩 X-선을 조사하였다. 위조직은 통상적인 전자현미경을 시료작성법에 따라 2.5% glutaraldehyde- 1.5% paraformaldehyde혼합액(0.1M phosphate buffer, pH 7.3)에 1차 고정한 후, 1% osmium tetroxide(0.1M phosphate buffer, pH 7.3)에 2차 고정하였다. 고정된 조직은 탈수과정을 거쳐 araldite혼합액에 포매하였으며, LKB-V ultratome르로 60-70nm두께의 얇은 절편을 작성하였다. 각 절편은 uranyl acetate와 lead citrate로 염색한후, JEM 100CX-Ⅱ전자현미경으로 관찰하여 다음과 같은 결과를 얻었다. 1. 방사선 조사후 6시간군의 경우, 위샘내강쪽으로 벽세포의 일부가 돌출되어 있는 것이 가끔 관찰되었으며, 미세사와 용해소체가 정상군의 것에 비하여 다소 증가되었으나 기타 세포질소기관의 미세구조적 변화는 관찰할 수 없었다. 2. 방사선 조사후 2일군이 경우, 미세사와 용해소체가 6시간군의 것에 비하여 더 많이 관찰되었다. 3. 방사선 조사후 6일군의 경우, 벽세포는 세포내세관과 미세융모가 미약하였으며 관소포구조의 막성구조가 파괴되고 세포질이 부분용해된 변성세포가 자주 관찰되었다. 이상의 결과로 보아 머리부분이 과도한 방사선에 노출되면 위점막의 벽세포는 초기에는 별다른 미세구조적 변화가 없으나 6일 정도가 지나면 분비기능에 관계된 미세구조들이 큰 손상을 받게 되므로 분비기능이 매우 약화된다고 생각된다. This experiment was performed to study the morphological responses of the gastric parietal cells of the head-irradiated rats. Male rats were divided into normal and experimental groups. The head region of the rat, under sodium thiopental anesthesia. was exposed to 3,000rads or 6,000rads of X-ray radiation in a single dose, respectively. The source was a Mitsubishi Linear Accelerator ML-4MV. The target to skin distance was 80cm, and the dose rate was 200rads/min. The rats of experimental groups were sacrificed on the 6 hours, 2 days and 6 days after X-ray irradiation. Pieces of the tissue taken from the body of the stomach were fixed in 2.5% glutaraldehyde-1.5% paraformaldehyde(0.1M Millonig's phosphate buffer, pH 7.3), and in 1% osmium tetroxide(0.1M Milloning's phosphate buffer, pH 7.3), and embedded in araldite mixture. The ultrathin sections stained with uranyl acetate and lead citrate were observed with JEM 100CX-II electron microscope. The results were as follow: 1. The morphological changes of the parietal cells were not pronounced, six hours after head irradiation. But the parietal cells protruding into the lumen of the gastric gland were infrequently observed and amounts of the microfilaments and lysosomes were slightly increased as compared with those of the control gorup. 2. Two days following irradiation, bundles of the microfilaments and the lysosome in the parietal cells were more frequently observed than those observed in the six hours group. 3. Dramatic decrease of intracellular canaliculi and microvilli of the parietal cells were observed on the 6th day, and destruction of tubulovesicular structures and partial cytolysis or necrosis were observed frequently. Above results suggest that high dose of head irradiation induces indirect hazardous effects on the gastric parietal cells of the rat, and the irradiated animals might suffered from weak acid secretion of the parietal cell, since the large number of the parietal cells are degenerated within a few days following irradiation.

사람의 혈관 내피세포에 대한 Salmonella 균종의 감염

송호연,고광균,최순룡 순천향대학교 1994 논문집 Vol.17 No.4

In order to elucidate the mechanism of injury to endothelial cell of blood vessels in typhoid fever, Salmonella typhi was inoculated in cultured human endothelial cells. Endothelial cells were prepared from the umbilical vein that was freshly obtained from human umbilical cord by collagenase treatment. After screening of cultured endothelial cells through the immunofluorescent antibody technique, ultrastructural change of cytopathic Aeffect, obtained by lectron microscopy, showed typical progress of pathogenesis caused by S. typhi; adherence, endocytosis, intracellular replication and release of microorganism. These patholgical changes led to cellular disruption and final death of endothelial cells. Endothelial cells of vascular system found to be the site of amplification as well as the target organ of S. typhi, which could play important role in hematogenous spread of this microorganism and also in pathologic sign or symptom in typhoid fever. An experimental infection of S. typhi in cultured human endothelial cells found to be an excellent and valuable virulence assay system. The above ability of S. typhi to proliferate and lead to endothelial cell death in cultured human endothelial cells confirmed to be a factor of endovascular disorder of typhoid fever such as rose spot on abdomen of patients.

고등학생 스트레스의 횡문화적 연구 : 연변의 한족, 조선족 및 서울의 한국인 비교

김대호,고복자,방금녀,김광일,박용천 大韓神經精神醫學會 1997 신경정신의학 Vol.36 No.2

In this transcultural comparison, we examined areas of stress, coping strategies and psychosomatic symptoms resulting form such strategies in Chinese, Korean-Chinese and Korean high school students. A total of 1,042 second-year high school students participated in this study : 213 Chinese from Yanbien, China ; 368 Korean-Chinese from Yanbien, China ; and 466 Koreans from Seoul, Korea. We administered the Stress Questionnaire Form for High school Students(Won & Lee 1995), the Ways of Coping-Revised(Lazarus & Folkman 1984) and the Physical Symptom Scale of Stress(Allen & Hyde 1980) to investigate areas of stress, coping stategies and psychosomatic symptoms, respectively. The findings were understood and interpreted from focus group discussions. Although there were no differences in total stress scores among the three groups, there were significant differences in areas of stress. Chinese students manifested the highest stress scores in peer relation, family problem, heterosexual problem, the future-employment, and religious problem. Koreans scored the highest in academic performance, school life, extracurricular activity, psychological-personality problem, value system, and the future-employment. The Korean-Chinese students scored the highest in extracurricular activity, family-economic problem. In terms of collectivism versus individualism, Chinese students' stress was related more toward the collective situation, whereas the Korean students faced increased stress regarding the individual situation. In coping strategies, the Chinese were characterized by active coping, Koreans by passive coping and Korean-Chinese by a mixture of the two. Koreans had the highest scores in psychosomatic symptoms, suggesting unfavorable coping strategies. The Korean-Chinese students seemed to lie intermediate between Koreans and Chinese in all three study areas, implying their chltural pluralism.