Ito 저색소증

이근수,장홍준,서연림,안규중,김종민,이종주 ( Geun Soo Lee,Hong Zoon Jang,Yeon Lim Suh,Kyu Joong Ahn,Jong Min Kim,Chong Ju Lee ) 대한피부과학회 1990 대한피부과학회지 Vol.28 No.5

A Case of Hypomelanosis of lto Geun Soo Lee, M.D., Hong Zoon Jang, M.D., Yeon Lim Suh*, M.D., Kyu Joong Ahn, M.Dl., Jong Min Kim, M.D., Chong Ju Lee, M.D. Departments of Dermatology and Pathology*, Clooege of Medicine, Hallym University Seoul, Korea We report a case of hypomelansis of Ito developed in a 6-year-old male patient. He had numberous bizarre, hypopigmented streaky macules on the left side of the chest, and upper arm. The histopathologi findings demonstrated that hypopigmented areas contained slightly decreased basal pigmentation with decreased content of intracellualr melanin in keratinocytes and melanocytes and revealed neither inflammatory changes nor dropping of melanin granule into the dermis. The electron microscopic finding showed decreased number of melanosomes, incomplete melaniztion, and cytoplasmic vacuoles in keratinocytes and melanocytes. Extra-cutaneous alterations were not found.

ZVT-PWM 승압형 컨버터를 이용한 무전극 램프의 역률 개선

서기영,문상필,박진민,김주용 경남대학교 신소재연구소 2003 신소재연구 Vol.15 No.2

무전극 램프(EFC)의 전등은 램프 양단에 고주파를 갖는 고전압을 인가해야 한다. 종래의 무전극 램프의 구동 회로로 선형 증폭기가 이용되어져 왔으나, 낮은 에너지 변환 효율로 인해 PWM 스위칭 방식의 인버터로 교체되고 있다. 그러나 고주파 스위칭시 인버터의 스위칭 소자에서 스위칭 손실의 증가 및 노이즈 발생의 문제로 인해 PWM 인버터는 고주파 동작이 제한된다. 이러한 문제점을 해결하기 위해 영전압 스위칭 기술을 PWM 인버터에 적용하여 고주파 스위칭이 가능하고, 또한 스위칭 손실과 노이즈 발생을 줄일 수 있다. 본 논문에서는, 무전극 램프 구동용 인버터의 역률 개선 회로로서 이용될 수 있는 승압형 컨버터에 있어서 소형화 및 고전력 밀도에 큰 장점을 갖는 영전압 천이 PWM 승압형 컨버터에 관한여 서술하였다. 영전압 천이 PWM 승압형 컨버터의 정상상태 동작을 구간별로 해석하였으며, 이를 통하여 영전압 스위칭 조건을 도출하였다. 또한 이 컨버터를 무전극 램프 구동용 인버터의 역률 개선 회로에 적용, 실험을 하였으며 그 결과 0.99이상의 역률을 달성함을써 역률 개선 동작의 타당성을 입증하였다. Driving the electrodeless fluorescent lamp, the high AC voltage with high frequency is required. The linear power amplifier has been widely used as a driving circuit of electrode-less fluorescent lamp(EFL). However, the low efficiency of the power amplifier causes the driving circuit to be replaced by a PWM switching inverter. In other to use a PWM switching inverter as the driving circuit of an electrode-less fluorescent lamp, the high switching frequency is required But due to the switching loss at switches of the inverter, the limitation of high switching frequency appears in the inverter. One solution to this limitation is to reduce the switching loss by using the zero voltage switching technique. In this paper, an application of the ZVT-PWM(Zero-Voltage-Transition) boost converter, which has great advantage on mini-on and high power density, to the power factor correction circuit of the EFL(Eiectrode1ess Fluorescent Lamp) inverter i s studied. The operation principle of the converter are described to identify the power factor correction characteristics of the inverter. Experimentally obtaining the high power factor above 0.99, it is verified that the power factor correction of the EFL inverter successfully achieved.

저손실 스너버 회로를 이용한 유도 전동기의 서지전압 억제

서기영,문상필,김주용,박진민 경남대학교 신소재연구소 2003 신소재연구 Vol.15 No.2

The development of advanced Insulated Gate Bipolar Transistor(IGBT)has enabled high-frequency switching operation and has improved the performance of PWh4 inverters for motor drive. However, the high rate of dv/dt of IGBT has adverse effects on motor insulation stress. In many motor drive applications, the inverter and motor are separated and it requires long motor type. The long cable contributes high frequency ringing at the motor terminal and it results in hight surge voltage which stresses the motor insulation. The inverter output filter and RDC snubber are conventional method which can reduce the surge voltage. In this paper, we propose the new low loss snubber to reduce the motor terminal surge voltage. The snubber consists of the series connection of charging/discharging capacitor and the voltage-clamped capacitor. At IGBT turn-off, the snubber starts to operate when the IGBT voltage reaches the voltage-clamped level. Since dv/dt is decreased by snubber operating, the peak level of the surge voltage can be reduced. Also the snubber operates at the IGBT voltage above the voltage-clamped level, the snubber loss is largely reduced comparing with RDC snubber. The proposed snubber enables to reduce the motor terminal surge voltage with low loss.

관절염으로 발현한 재발성 다발성 연골염 1례

엄민식,박원우,서승철,이진호,조주연,최혜영,이찬희,임소덕 白中央醫療院 2005 仁濟醫學 Vol.26 No.1

Relapsing polychondritis is an uncommon multisystemic disease which is characterized by recurrent episodes of inflammation and progressive destruction of cartilaginous tissue. The cause of relapsing polychondritis is unclear and suspected to be autoimmune pathophysiology. It involves cartilage of nose, vertebra, trachea, peripheral joint as well as structures of eye, heart, blood vessels or inner ear. Auricular chondritis is present in almost all patients, and multiple arthritis, nasal chondritis, saddle nose, eye involvement, laryngotracheal involvement and skin manifestations are also present. We report a case of relapsing polychondritis presented a arthritis with review of literatures.

신부전증과 폐에 Pseudolyrmphorma를 동만한 원발성 Sjogren 증후군 : Cyclophosphamide와 Prednisolone에 의한 성공적인 치료

강민규,구영선,황평주,김종학,나기량,서광선,이강욱,신영태 대한신장학회 2000 대한신장학회잡지 Vol.19 No.4

쌍태아에서 제 1태아의 분만 후 제 2태아의 지연분만 : 중례보고

김주환,서민정,유희정,노권일,조대현,박정규,이정헌,조성남,손영수 朝鮮大學校 附設 醫學硏究所 2005 The Medical Journal of Chosun University Vol.30 No.3

With the widespread use of fertility medications and techniques of in vitro fertilization, multiple gestation has become epidemic in modern obstetric practice. Delivery of the initial fetus in a multiple gestation usually is followed by delivery of the subsequent fetus or fetuses shortly thereafter. However in rare circumstances, the delivery is delayed for days due to disappearance of uterine contraction after delivery of the first fetus. When uterine activity ceases after the delivery of the first neonate, a policy of nonintervention may be considered in case of an immature or very premature delivery, in order to achieve a gestational age for the remaining fetus(es) more compatible with neonatal survival. We report a case of twin gestation with prolongation of the delivery interval between the twins for 46 days.

벽면부착방식 PV시스템의 建築物 適用可能性에 關한 硏究

김재원,오민석,이성주,최인창,이응직,김회서 대한건축학회 2003 대한건축학회논문집 Vol.19 No.6

Building integrated photovoltaic(BiPV)systems can from a cohesive design, construction, and energy solution for the built environment. The benefits of building integration are well documented and are gaining significant public recognition and government support. PV cells, however, convert only a small portion of the incoming isolation in to electricity. The rest is either reflected or lost in the form of sensible heat and light. In order to judge of the Integration capability to the BIPV system, energy efficiency, capacity and integration capability is studied by considering the production quantity of electric power and U-value of PV system.

상피종양의 keratin 생성능에 대한 전자현미경적 연구

이길선,이명주,장정수,이민전,노광을,서재홍 朝鮮大學校 附設 醫學硏究所 1993 The Medical Journal of Chosun University Vol.18 No.1

Keratins are characteristically present in all keratinizing and nonkeratinizing epithelial cells and their neoplasms. They consist of at least 19 different polypeptides ranging from 40 to 69 kilodaltons, which are developmentally related to specific epithelial cell types. Keratins of high and intermediate molecular weights are readily demonstrated in squamous cell carcinomas, which are characteristically rich in tonofilaments and tonofilament-desmosome complexes. Keratins of low molecular weights are expressed in adenocarcinoma including renal cell carinoma, hepatocellular carcinoma, small cell carcinoma, and carcinoid tumor. These tumors do not reveal any tonofilaments and sacrcely show discrete filaments on electron microscopy. An immunoperoxidase technique employing antibody to keratin was used to study distribution and staining pattern of keratin filaments in benign and malignant epithelial tumors (20 squamous cell carcinomas, 20 gastric adenocarcinomas, 20 transitional cell carcinomas and 15 non-neoplastic epithelia). These immunohistochemical results were compared with ultrastructural features of neoplastic diagnosis of squamous cell carcinoma, adenocarcinoma and transitional cell carcinoma, and estimation of degree of differentiation. The results are as follows : 1. The squamous epithelium, glandular epithelium and transitional epithelium disclosed the positive reaction for keratin. 2. Squamous cell carcinoma and transitional cell carcinoma exhibited positive reaction for keratin. 3. Gastric adenocarcinoma showed uniformly negative or weakly positive reaction for keratin. 4. On electron microscopy, heavy bundles of tonofilaments and desmosomes were more frequently encountered in well differentiated squamous cell carcinoma, In poorly differentiated squamous cell carcinoma, a few tonofibrils and desmosome were noted. 5. In the adenocarcinomas, the intermediate filaments were arranged randomly as nonaggregated, short filaments spread throughout the cytoplasm, although occasionally they formed a perinuclear whorl. These filaments did not become aggregated to form tonofilaments. 6. On the immunogold labeling for keratin of low molecular weight areas in gastric adenocinoma, in tense labeling of intermediate filaments for keratin was noted. From the above result, ultrastructural and immunohistochemical study on malignant epithelial cell were useful in differential diagnosis of squamous cell carcinoma, adenocarcinoma and transitional cell carcinoma, and estimation of degree of differentiation. It was also proved that immunogold labeling technique was especially valuable for diagnosis of vague case which showed negative or weakly positive reaction in immunohistochemical stain.

환경친화형 수분산성 불소 아크릴레이트 공중합체에 의한 섬유 표면개질

유수용,김정두,문명준,서차수,주창식,이민규 한국환경과학회 2004 한국환경과학회지 Vol.13 No.10

Waterborne fluorinated acrylate copolymer (WFAC) for surface modification of textile was synthesized from perfluoroalkyl ethyl acrylate, octadecyl acrylate, glycidyl methacrylate, surfactant and 3,3 methyl-methoxy butanol. The structures of the synthesized WFAC were determinated by FT-IR and ^(19)F-NMR analysis. The thermal stability investigated with DSC and TGA was decreased with increasing the content of fluorinated acrylate in the copolymer. However, the particle sizes of WFAC were increased with increasing the content of fluorinated acrylate in the copolymer. The surface energies calculated by contact angles of WFAC were in the range of 29.80~3.41 dyne/cm. On the observing SEM of the textile surface treated with WFAC, the textile was swollen and compacted with increasing the concentration of water repellency agent. WFAC synthesized in this study showed a good water repellency.

QTL Mapping of Agronomic Traits in an Advanced Backcross Population from a Cross between Oryza sativa L. cv. Milyang 23 and O. glaberrima

Ju-Won Kang,Jung-Pil Suh,Dong-Min Kim,Chang-Sik Oh,Ji-Min Oh,Sang-Nag Ahn 한국육종학회 2008 한국육종학회지 Vol.40 No.3

In the previous study, 141 BC3F2 lines from a cross between the Oryza sativa cv. Milyang 23 and O. glaberrima were used to identify favorable wild QTL alleles for yield component traits. In this study, we carried out QTL analysis of four grain morphology as well as four yield component traits using 141 BC3F5 lines from the same cross and compared QTLs detected in two different generations. The mean number of O. glaberrima segments in the 141 BC3F5 lines ranged from 1 to 13 with 2.69 and 5.71 of the average means of homozygous and heterozygous segments, respectively. There was a three-fold difference in the number of QTLs detected for four traits commonly evaluated in two generations (seven QTLs in the BC3F5 vs 21 in the BC3F2 population). The percentages of the phenotypic variance explained by QTLs in the BC3F5 population were similar to or less than those in the BC3F2 population. This is probably due to the difference in the genetic composition of two populations and the environmental effects. The locations of the QTLs commonly detected in both generations were in good agreement except for one QTL for spikelets per panicle. The yield QTL, yd3 was colocalized with the spikelets per panicle, spp3. Yield increase at this locus is due to the increase in spikelets per panicle, because both traits were associated with increase in spikelets per panicle and yield due to the presence of an O. glaberrima allele. Clusters of QTLs for grain morphology traits were observed in two chromosome regions. One cluster harboring five QTLs near SSR markers RM106 and RM263 was detected on chromosome 2. This population would serve as a foundation for development of the introgression line population from a cross between Milyang 23 and O. glaberrima.