전기영동 초전도후막의 전착밀도 개선

소대화,전용우,이영매,임병제,Korobova, Natalya 명지대학교 산업기술연구소 2001 産業技術硏究所論文集 Vol.20 No.-

YBCO superconducting thick films were perpared on Ag wire by electrophoresis in acetone and ethanol with chemically modified suspension. The addition of organic compounds, such a PEG into suspension solution for improving critical current density was investigated. Surfac state, deposition conditions, pore distribution and cracks were investigated by using SEM photographs. Controlling preparation conditions were studied for reducing these defects. As a results, in acetone slolution, the surface crack of samples was decreased with increasing PEG. To develop optimum microstructures for samples processes affect the microstructure and hence the properties of ceramic superconductors.

Non-sexually related acute genital ulcer in a 16-year-old female

( Byung Woo Soh ),( Eun So Lee ) 대한피부과학회 2016 대한피부과학회 학술발표대회집 Vol.68 No.1

Nonsexually acquired genital ulceration, otherwise known as Lipschutz ulcer, is characterized by acute painful genital ulcerations that occur in young women and girls without clear infectious source. It is often accompanied by systemic symptoms such as fever, myalgia or lymphadenopathy and is therefore considered to be associated with distant source of infection or inflammation. Diagnosis is made by excluding sexually transmitted infections, autoimmune diseases or Behcet’s disease. We herein report a typical case of Lipchutz ulcer in a 16 year-old female and hope to aid physicians to consider this uncommon entity in their differential diagnosis of acute genital ulcers, as it may cause great distress to the persons involved when diagnosed otherwise.

Recent trends in cutaneous melanoma incidence and mortality : a 10-year nationwide cohort study

( Byung Woo Soh ),( You Chan Kim ),( Jee-woong Choi ) 대한피부과학회 2017 대한피부과학회 학술발표대회집 Vol.69 No.2

Background: The incidence and mortality rate of invasive melanoma has risen steadily worldwide adding markedly to the socioeconomic burden. Numerous studies on incidence and mortality of melanoma were reported for Caucasians but rarely for Asian population including Korea Objectives: We sought to determine the incidence rates of cutaneous melanoma and melanomas in situ using data from a nationally representative sample of one million South Koreans. Methods: We investigated the Korean National Health Insurance Service-National Sample Cohort. Annual and overall incidence rates during the study period (2004-2013) as well as sociodemographic factors associated with survival rates were evaluated. Results: The overall incidence was 2.56 (95% confidence interval. 2.23-2.89) per 100,000 person-years. The incidence decreased with time until 2009 and increased after 2010. The five-year survival rate for cutaneous melanoma was 78.8% and for melanoma in situ was 100%. Male sex and old age were associated with early deaths, while socioeconomic status was not. The most frequently involved site was the face followed by the lower limbs. The most common cause of death was the melanoma. Conclusion: Our analyses revealed stable incidence rates of cutaneous melanoma with an increasing trend during the last four years. The five-year survival rate for cutaneous melanoma was comparable to previous reports.

Cutaneous tuberculosis infection after upper eyelid blepharoplasty

( Byung Woo Soh ),( Sue Kyung Kim ) 대한피부과학회 2015 대한피부과학회 학술발표대회집 Vol.67 No.1

Blepharoplasty eyelid has been an uncommon cosmetic procedure for several decades among Korean people. It is considered as a simple and safe procedure relatively. However, there are several literatures reporting eyelid tuberculosis following the procedure, either by direct inoculation or by contiguous spread from adjacent structures. In previously reported cases, tuberculosis infection occurred shortly after the procedure, mostly within a month, and occurred unilaterally. Herein, we report a case of bilateral eyelid tuberculosis which occurred remotely after the procedure. A 51-year-old woman presented with linear reddish swelling on both upper eyelids with the onset of 3 months. The patient hadno significant medical history except for the blepharoplasty done 10 years ago. Histologically, tuberculoid granulomas with Langhans giant cells, marked lymphocytic infiltration and absence of caceous necrosis were observed. The diagnosis was made with additional TB-PCR, Interferon-gamma release assays and PPD skin test. Laboratory tests and x-ray results were within the normal range and there was no evidence to suspect other site of infection. Oral quadruple therapy was initiated and the lesions improved significantly after 1 month. There was no sign of aggravation for 3 months.

The effect of LED therapy on wound healing in mouse model: focused on signal transduction pathway of fibroblast

( Byung Woo Soh ),( Sue Kyung Kim ),( You Chan Kim ) 대한피부과학회 2015 대한피부과학회 학술발표대회집 Vol.67 No.2

Background: Low level light therapy with LEDs LED-LLLT) is known to promote wound healing. In a molecular perspective, TGF-モ signaling through SMAD molecules in fibroblasts is known to play fundamental role. But studies are rare that directly compare the effect of different wavelength of LEDs or their effect in the molecular level. Objectives: We investigated the effect of blue (410nm), red (630nm), and infrared (830nm) light on wound closure and underlying changes of signal transduction pathway in fibroblast of mouse model. Methods: Full thickness wound was made on the dorsal skin of mice and was irradiated using blue, red, and infrared LED for 5 consecutive days. We investigated the wound healing effect induced by different wavelengths and by different timing of the LED irradiation after wounding. At each predetermined time point the wound closure was measured and wounded skin was harvested forimmunohistochemical stain. Results: The wound closure was accelerated when treated at 830nm compared to 630nm or the control group. The effect was best when treated immediately after the wounding. The level of TGF-モ decreased continuously after the wounding whereas SMAD7 showed increasing tendency. The level of SAMD3 and collagen showed no significant difference. Conclusion: The LED-LLLT with 830nm wavelength immediately after wounding may induce the best effect for wound healing. The LED-LLLT induced lower level of TGF-モ and higher level of SMAD7 initially but was not statistically significant.

Increasing prevalence of alopecia areata in South Korea

( Byung Woo Soh ),( So Min Kim ),( You Chan Kim ),( Gwang Seong Choi ),( Jee Woong Choi ) 대한피부과학회 2018 대한피부과학회 학술발표대회집 Vol.70 No.2

Background: Alopecia areata (AA) is a common inflammatory condition affecting hair, but epidemiologic study on the disease, especially in Asia, is rare and offers inconsistent results from one study to another. Objectives: To investigate the prevalence and incidence of AA, including alopecia totalis (AT) and alopecia universalis (AU), and to clarify their demographic distribution. Methods: We analyzed a nationwide representative sample cohort of over one million South Koreans using data from the National Health Insurance Service-National Sample Cohort from 2002 to 2013. Results: Overall incidence and prevalence during the study period was 98.5 (95% confidence interval (CI), 96.6-104.4) and 154.6 (95% CI, 134.9-174.3), respectively. Overall increases were seen in both of these measures during the period. The mean prevalence of AT per 100,000 persons was 3.7 (95% CI, 3.5-3.9), and the prevalence rate of AT per 100 AA patients was 2.4 (95% CI, 2.2-2.7). The mean prevalence of AU per 100,000 persons was 0.9 (95% CI, 0.7-1.1) and the prevalence rate of AU per 100 AA patients was 0.6 (95% CI, 0.5-0.7). The age distribution resembled a bell shaped curve peaking at ages from 30 to 39 for both the AA and AU or AT combined. Conclusion: This is the first nationwide population-based, epidemiologic study of AA in the Asian population. Our result demonstrates an increase in the frequency especially in milder form of AA in South Korea, contributing to a greater appreciation of the disease burden.

Comparative study of oncologic outcomes for laparoscopic vs. open surgery in transverse colon cancer

Woo Ram Kim,Se Jin Baek,Chang Woo Kim,Hyun A Jang,Min Soo Cho,Sung Uk Bae,Hyuk Hur,Byung Soh Min,Seung Hyuk Baik,Kang Young Lee,Nam Kyu Kim,Seung Kuk Sohn 대한외과학회 2014 Annals of Surgical Treatment and Research(ASRT) Vol.86 No.1

Purpose: Laparoscopic resection for transverse colon cancer is a technically challenging procedure that has been excluded from various large randomized controlled trials of which the long-term outcomes still need to be verified. The purpose of this study was to evaluate long-term oncologic outcomes for transverse colon cancer patients undergoing laparoscopic colectomy (LAC) or open colectomy (OC). Methods: This retrospective review included patients with transverse colon cancer who received a colectomy between January 2006 and December 2010. Short-term and five-year oncologic outcomes were compared between these groups. Results: A total of 131 patients were analyzed in the final study (LAC, 84 patients; OC, 47 patients). There were no significant differences in age, gender, body mass index, tumor location, operative procedure, or blood loss between groups, but the mean operative time in LAC was significantly longer (LAC, 246.8 minutes vs. OC, 213.8 minutes; P = 0.03). Hospital stay was much shorter for LAC than OC (9.1 days vs. 14.5 days, P < 0.01). Postoperative complication rates were not statistically different between the two groups. In terms of long-term oncologic data, the 5-year disease-free survival and overall survival were not statistically different between both groups, and subgroup analysis according to cancer stage also revealed no differences. Conclusion: LAC for transverse colon cancer is feasible and safe with comparable short- and long-term outcomes.

시공간상의 궤적 분석에 의한 제스쳐 인식

민병우(Byung-Woo Min),윤호섭(Ho-Sub Yoon),소정(Jung Soh),에지마 도시아끼(Toshiaki Ejima) 한국정보과학회 1999 정보과학회논문지(B) Vol.26 No.1

사람과 컴퓨터와의 정보 전달 수준이 사람과 사람 사이의 의사 소통과 같이 자연스럽게 이루어 지게 하기 위한 도구 중에서 제스쳐에 의한 정보 전달 메커니즘이 중요한 분야로서 자리 잡게 되었다. 이를 위해 제스쳐 인식에 관한 많은 연구가 진행되어 왔으나 영상처리 및 인식 부분의 어려움을 극복하기 위해 데이타 글로브나 구별이 쉬운 장갑 등의 외부 장비를 사용하거나, 연속적인 제스쳐 상에서 의미 있는 부분을 임의로 추출하여 인식하는 연구가 수행되어 왔다. 본 연구에서는 제스쳐의 인식을 순수히 시각정보에 의해 수행되도록 고려하였으며, 의미 있는 부분인 키-제스쳐를 구분해 내기 위하여 하나의 제스쳐가 세 가지 단계로 이루어 지고 각 단계 사이에는 속도의 변화가 있다는 조건을 강화하여 이를 스팟팅의 기본 알고리즘으로 활용하였다. 제스쳐의 궤적은 손의 움직임에 의한 중심점 토큰들의 집합으로 나타나며 이들은 극좌표 상에 투영된다. 극 좌표 상에서 제스쳐를 구성하는 토큰들은 LBG 알고리즘에 의해 군집화되며, 각 군집이 하나의 심볼로서 표현된다. 이러한 제스쳐를 구성하는 각 토큰들의 심볼들은 HMM(Hidden Markov Models) 상에서 학습되어 인식에 활용된다. 본 연구에서 대상으로 하는 제스쳐의 어휘는 기본적인 도형요소의 편집에 활용하기 위한 22개의 동적 제스쳐 이다. 각 제스쳐에 대해 100 개의 데이타를 수집하여 그 중 50개는 학습에 활용하고 나머지 50개는 인식 실험에 활용하였으며, 인식결과 95% 수준의 인식률을 얻었다. 또한, 개발된 시스템은 실시간으로 기본 도형요소의 편집이 가능하도록 개발되어 사람과 컴퓨터, 또는 사람에 의한 기기의 제어 등에서 활용될 수 있음을 확인하였다. Researches on the gesture recognition have become a very interesting topic in the computer vision area. Gesture recognition from visual images has a number of potential applications such as HCI (Human Computer Interaction), VR(Virtual Reality), machine vision. To overcome the technical barriers in visual processing, conventional approaches have employed cumbersome devices such as datagloves or color marked gloves. In this research, we capture gesture images without using external devices and generate a gesture trajectory composed of point-tokens. The trajectory is spotted using phase-based velocity constraints and recognized using the discrete left-right HMM. Input vectors to the HMM are obtained by using the LBG clustering algorithm on a polar-coordinate space where point-tokens on the Cartesian space are converted. A gesture vocabulary is composed of twenty-two dynamic ham) gestures for editing drawing elements. In our experiment, one hundred data per gesture are collected from twenty persons. Fifty data are used for training and another fifty data for recognition experiment. The recognition result shows about 95% recognition rate and also the possibility that these results can be applied to several potential systems operated by gestures. The developed system is running in real time for editing basic graphic primitives in the hardware environments of a Pentium-pro (200 MHz), a Matrox Meteor graphic board and a CCD camera, and a Window95 and Visual C++ software environment.

한국 동굴생물상 목록 및 연구 전망

김병우 ( Byung Woo Kim ),최용근 ( Young Gun Choi ),서호영 ( Ho Young Soh ),이훈 ( Hoon Lee ),김원록 ( Won Rok Kim ),이원철 ( Won Choel Lee ) 한국환경생물학회 2004 환경생물 : 환경생물학회지 Vol.22 No.1

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Electron microscopic study of novel threadlike structures on the surfaces of mammalian organs

Lee, Byung-Cheon,Yoo, Jung Sun,Ogay, Vyacheslav,Kim, Ki Woo,Dobberstein, Harald,Soh, Kwang-Sup,Chang, Byung-Soo Wiley Subscription Services, Inc., A Wiley Company 2007 Microscopy research and technique Vol.70 No.1

<P>The ultrastructures of novel threadlike structures (NTSs) and corpuscles on the surfaces of internal organs of rats were investigated using electron microscopy. The samples were studied in situ by using a stereomicroscope and were taken for further morphological analysis. Scanning electron microscope (SEM) images revealed a bundle structure of threadlike tissue, which was composed of several 10-μm-thick subducts. The surfaces of the corpuscles were rather coarse and fenestrated. The corpuscles had cucumber-like shapes with an average length of about 2 mm and a thickness of about 400 μm. Transmission electron microscope (TEM) images disclosed disordered collagen fibers, which formed the extracellular matrix of the threadlike tissue, and immune-function cells, like macrophages, mast cells, and eosinophils. Sinuses of various diameters, which were thought to be cross-sections of the lumens of the subducts, were observed in the TEM, cryo-SEM and focused-ion-beam SEM images. These SEM images were obtained for the first time to reveal the detailed structure of the NTSs that were only recently discovered. Microsc. Res. Tech., 2006. © 2006 Wiley-Liss, Inc.</P>