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유광호 ( Kwang Ho Yoo ),노용관 ( Yong Kwan Rho ),김동하 ( Dong Ha Kim ),박주희 ( Ju Hee Park ),김범준 ( Beom Joon Kim ),김명남 ( Myeung Nam Kim ),한태영 ( Tae Young Han ),이갑석 ( Kap Sok Li ),서성준 ( Seong Jun Seo ),홍창권 ( Cha 대한피부과학회 2009 대한피부과학회지 Vol.47 No.7
Background: Androgenic alopecia (AGA) is characterized by the local and gradual transformation of terminal scalp hair into vellus hair, which has a shorter and thinner shaft. It is the most common form of hair loss in people with a genetic predisposition for baldness. Objective: The aim of this study was to evaluate the prevalence, AGA type, family history, co-morbidity diseases, stress factors and endocrine factors of AGA patients. Methods: We examined a total of 432 male and female AGA patients who visited for two years at the Department of Dermatology, School of Medicine, Chung-Ang University. Results: There were 2.06 times more men (291 patients) than women (141 patients) among the study subjects. Most of the men were in their twenties (108, 37.1%), however, most of the women were in their forties (42, 29.7%). In the 291 male patients, Norwood class IIIv was dominant (120 patients, 41.2%). In the 141 female patients, Ludwig class I was dominant (87 patients, 61.7%). 219 (75.2%) of the 291 male patients and 81 (73.6%) of the 141 female patients had a family history of AGA. 224 (76.9%) of the 291 male patients and 101 (53.4%) of the 141 female patients had a co-morbidity disorder. The most common among these disorders in both the male and female patients was seborrheic dermatitis. Stress factors were observed in 162 (55.6%) of the 291 male patients and in 78 (55.3%) of the 141 female patients. The most common stress factor in both the male and female patients was work tasks. The serum testosterone levels was increased in 51 (17.5%) of the 291 male patients and in 20 (14.1%) of the 141 female patients. Conclusion: Most of the study results are compatible with those of our previous study. Yet the following results were different: (1) the number of female AGA patients in their forties is increasing; and (2) stress was found to be associated with AGA in both the male and female patients. (Korean J Dermatol 2009;47(7):765~771)
유광호 ( Kwang Ho Yoo ),김지영 ( Ji Young Kim ),이갑석 ( Kap Sok Li ),서성준 ( Seong Jun Seo ),홍창권 ( Chang Kwun Hong ) 대한피부과학회 2009 大韓皮膚科學會誌 Vol.47 No.1
Background: It is well known that patients with atopic dermatitis are prone to cutaneous infections, and especially superficial fungal infection. However, a study on the relationship of superficial fungal infection in atopic dermatitis patients has not yet been performed in Korea. Objective: The purpose of this study is to evaluate the relationship of atopic dermatitis to superficial fungal infection in Koreans. Methods: We examined for evidence of superficial fungal disease in 2,153 atopic dermatitis patients and we compared the findings to those of 126,777 non-atopic dermatitis patients who visited the Department of Dermatology of Chung-Ang University from January 2003 to December 2007. Results: Superficial fungal infections were more common in the atopic dermatitis patients (6%) than in the controls (2.5%) (p<0.05) and especially in the age group of the 1st and 2nd decades (p<0.05). The seasonal prevalence of superficial fungal infection was high during summer for both groups (38% vs 44%, respectively). The most common site of fungal distribution was feet (Tinea pedis) for both groups (42.5% vs 28.1%, respectively). The prevalence of coexisting superficial fungal infection was not significantly different in both groups (38.3% vs 39.9%, respectively). The most common isolated organism was Trichophyton rubrum in both groups (52.7% vs 38%, respectively). Conclusion: The study shows that the prevalence of superficial fungal infection in atopic dermatitis patients is higher than that in controls. Therefore, we should consider the presence of combined superficial fungal infection in recalcitrant atopic dermatitis patients and use antifungal agents for treatment. (Korean J Dermatol 2009;47(1):1~5)
차량용 고 분해능 디지털 MEMS 가속도센서 시스템 IC 개발
유광호(Kwangho Yoo),고형호(Hyoungho Ko),이아라(Ahra Lee),임재상(Jaesang Lim),이상윤(Sang-Yoon Lee),정덕균(Deog-Kyoon Jeong),박민하(Minha Park),장현수(Hyunsu Jang),이정표(Jeongpyo Lee),조동일(Dong-il Dan Cho) 한국자동차공학회 2006 한국자동차공학회 Symposium Vol.- No.-
This paper presents design, fabrication and measurement of a high resolution digital microelectromechanical systems (MEMS) accelerometer system IC. This system IC consists of a MEMS sensing element and a high resolution digital readout circuit. The MEMS sensing element is fabricated using the sacrificial/bulk micromachining (SBM) process. In order to protect the sensing element from environmental changes, wafer level hermetic packaging(WLHP) process is performed. The developed readout circuit offers 32-bit resolution using an 1-bit, 4th-order ΣΔ modulator and a digital decimator/demodulator. The proposed system IC provides a 128-㎐, 32-bit digital output with ±5g dynamic range, 0.52% nonlinearity, and 1.6*10? count/g scale factor.
광화학요법(PUVA)과 Interfernon-γ의 병합요법으로 호전을 보인 초기 균상 식육종
유광호 ( Kwang Ho Yoo ),김연진 ( Yeon Jin Kim ),노용관 ( Yong Kwan Rho ),박주희 ( Ju Hee Park ),김지영 ( Ji Young Kim ),이갑석 ( Kap Sok Li ),서성준 ( Seong Jun Seo ),홍창권 ( Chang Kwun Hong ) 대한피부과학회 2008 대한피부과학회지 Vol.46 No.10
Early stage mycosis fungoides (MF) is known to be responsive to various topical and systemic therapies such as corticosteroids and ultraviolet light radiation, photochemotherapy with psoralens and whole-body electron beam irradiation. However, these treatments have all revealed a high relapse rate. Thus, we suggest that more invasive therapy, including PUVA combined with interferon-γ, is one of the possible treatments for early MF because this treatment displays a reduced relapse rate. We report here on a case of early stage MF (Stage Ib) that was successfully treated with PUVA (total dose: 105.7 J/㎠) and intravenous administration of recombinant human interferon-γ (total 5.4×10(6) IU), and the patient has been without relapse 1 year after treatment. (Korean J Dermatol 2008;46(10):1402∼1406)
전동식 파워스티어링 용 전자기유도 방식 토크센서 개발에 관한 연구
유광호(Kwangho Yoo),서정욱(Jungwook Seo),반재원(Jaewon Ban),김완일(Wanil Kim),Manfred Bartscht,장현섭(Hyunsup Jang),권도욱(Dowook Kwon),한상휘(Sangwhi Han) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
In this paper, we will present an inductive torque sensor development which could be preferably used in EPS systems. This torques sensor has capability of both input and output side rotary positions sensing with resolution of 0.005deg/0.01deg respectively. Differential angle between two rotating shaft linked by a torsion-bar can be calculated simply using two angle signals by the ECU. Digital output protocol “SENT” interface applied to strengthen noise performance in an automotive environment and diagnosis capability. For redundancy, the torque sensor consists of two sensors which can independently measure both input shaft and output shaft angles. The two sensors are electrically isolated from each other with their own power supply, ASIC, excitation and receiver coils. That means altogether four angles are measured whereby two angles are transmitted via each SENT signal line. This redundancy allows the ECU to crosscheck the signals to be able to detect faults inside the sensor or the wiring harness. Due to its both side angle measurement principle, the most critical performance parameter is a ripple which means output variation with 0-torque input during 360deg rotation. And the ripple parameter can be understood as superposition of offset error, low frequency ripple(LFR), high frequency ripple(HFR) and random noise. Averaged ripple measured from the developed sensors are to be 0.002deg offset, 0.032deg LFR, 0.010deg HFR, which are sufficiently acceptable for stable control of EPS system and good feeling for drivers.
유광호 ( Kwang Ho Yoo ),김연진 ( Yeun Jin Kim ),노용관 ( Yong Kwan Rho ),이진웅 ( Jin Woong Lee ),김범준 ( Beom Joon Kim ),김명남 ( Myeung Nam Kim ) 대한피부과학회 2008 대한피부과학회지 Vol.46 No.12
Warts are benign proliferations caused by human papillomavirus (HPV) that commonly involve the skin and other epithelial tissues. Many therapeutic modalities are available for the treatment of warts. We report 2 cases of doughnut-shaped warts following cryosurgery with liquid nitrogen. Our cases demonstrate that, after removal, relapse of warts within a few weeks is frequent and probably due to sub-clinical or latent HPV infections surrounding the warts. Our cases suggest that we should be aware of possible recurrence and that adjuvant therapy, such as immune response modifiers with potent antiviral activities, should be used to reduce the incidence of wart recurrence after cryosurgery. (Korean J Dermatol 2008;46(12):1651∼1653)
증례 : 순환기 ; 감전 사고 후 발생한 발작성 심방세동 1예
유광호 ( Kwang Ho Yoo ),김지운 ( Ji Woon Kim ),김주환 ( Ju Hwan Kim ),구승원 ( Seung Won Koo ),박현정 ( Hyun Jung Park ),성정훈 ( Jung Hoon Sung ) 대한내과학회 2011 대한내과학회지 Vol.80 No.2S
감전사고 이후 발생하는 심방세동의 빈도는 매우 드문 것으로 알려져 있다. 이전에 보고된 감전 후 심방세동은 1000볼트 이상의 고전압에 의한 것이 대부분이었고, 본 증례의 경우는 약한 볼트의 가정용 전압에서 발생된 것으로 국내에서는 그 예가 보고된 바가 없다. 부정맥이 감전에 의해 유발되는 정확한 기전은 아직까지 명확하지 않다. 다만, 체내로 들어온 전류는 전기적 저항의 차이에 의해 주로 혈관과 신경을 타고 주행하게 되며 이로 인해 심장이 취약한 것으로 알려져 있다. 본 환자의 경우 약한 전압임에도 입을 통해 심장을 관통하여 왼손으로 주행하였기 때문에 일시적인 부정맥을 일으켰을 것으로 생각된다. 심방세동의 치료는 베타차단제, 칼슘차단제, 디곡신 등으로 심박동수를 조절하거나, 필요하다면 class I, III와 같은 심부정맥약물로 정상동율동을 회복하여야 하고, 혈역학적으로 불안정한 경우 DC cardioversion 등을 고려해야 한다. Electrical injuries can cause cardiac abnormalities, ranging from dysrhythmias to myocardial infarction. Atrial fibrillation after electrical injury is extremely rare. The mechanisms underlying electrical current-induced arrhythmias are unclear. However, due to differences in electrical resistance, current travels preferentially along blood vessels and nerves, making the heart the most susceptible organ to electrical injury. Cardiac arrhythmias may occur at the time of electrical injury or later, but most occur within the first day of injury. Almost all patients described in previous reports with atrial fibrillation developed the condition after high voltage injuries (> 1,000 V). In our case, however, atrial fibrillation developed after a low voltage injury (220 V). Atrial fibrillation was detected and the rate was controlled with intravenous digoxin infusion. A normal sinus rhythm was restored 21 h after the electrical injury. (Korean J Med 2011;80:S142-S145)
정보사회와 컴퓨터교과 학습을 위한 교육과정 고찰과 웹 코스웨어 설계
유광호(Kwang-Ho Yoo),김영봉(Young-Bong Kim) 한국멀티미디어학회 2006 한국멀티미디어학회 학술발표논문집 Vol.2006 No.1
고등학교의 71.46%가 일반계 고등학교이다. 그러나 일반계에서는 6차 교육과정에 있던 프로그래밍 내용이 7차 교육과정의 ‘정보사회와 컴퓨터’에는 제외되어 프로그래밍에 대한 접근이 전혀 이루지지 못하고 있다. 그러므로 본 연구에서 멀티미디어 기능에 쉽게 접근 할 수 있고 애니메이션 기능이 있는 액션스크립트로서 학습자에게 흥미를 가지도록 하면서 프로그래밍에 자연스럽게 접하고 원리를 이해 할 수 있는 WBI에 근거한 프로그래밍 내용을 포함하는 웹 코스웨어를 제시하고자 한다.