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피지샘종, 기저세포상피종, 에크린 땀구멍종을 동반한 피지샘 모반
이건홍 ( Gun Hong Lee ),김대현 ( Dae Hyun Kim ),이상훈 ( Sang Hoon Lee ),이성열 ( Sung Yul Lee ),이종석 ( Jong Suk Lee ),황규왕 ( Kyu Uang Whang ) 대한피부과학회 2009 대한피부과학회지 Vol.47 No.7
Nevus sebaceous (NS) is a congenital hamartomatous disorder of the skin and its adnexa, usually involving the scalp or the face. It characteristically evolves and changes morphology with time. Various benign and malignant neoplasms can develop in association with NS. Most common benign or malignant tumors developed within the NS are syringocystadenoma papilliferum and trichoblastoma or basal cell epithelioma. We now report a case of NS associated with sebaceous adenoma, basal cell epithelioma, and eccrine poroma in a 63 year old male. (Korean J Dermatol 2009;47(7):825~830)
이건홍 ( Gun Hong Lee ),이상훈 ( Sang Hoon Lee ),이성열 ( Sung Yul Lee ),이종석 ( Jong Suk Lee ),황규왕 ( Kyu Uang Whang ) 대한피부과학회 2010 대한피부과학회지 Vol.48 No.4
Background: Chickenpox is caused by the varicella zoster virus of herpes viridae and very contagious childhood disease. It is uncommon in adults and can be associated with serious complications. And chickenpox may be dangerous in adult patients, because the complications are more frequent in adults than children. Objective: The purpose of this study was to investigate the clinical characteristics of chickenpox occurred in adults in Korea. Methods: Total 100 cases of chickenpox inpatients over the 18 years of age were retrospectively evaluated in regard to monthly, seasonal incidence, sexual difference, age distribution, hospitalization period, transmission route, prodromal symptoms, cutaneous manifestations, the associated conditions, laboratory abnormalities, complications during 18 year period from 1991 to 2009. Results: The results were as follows. 1. Monthly incidence of chickenpox was highest in May (20%), lowest in September (2%). The peak incidence on seasonal analysis was in Spring and Summer and the lowest incidence was in Autumn. 2. The ratio of males to females was 1.3: 1. Chickenpox was seen most frequently in the 20-39 year age group (82%). 3. The mean onset time was 3.6 days, and the mean hospitalization period was 6.1 days. 4. The frequencies of the prodroml symptoms in chickenpox, in descending order, were fever (79%), sore throat (26%), myalgia (26%), itching (24%), chilling (21%), headache (9%), cough (8%), fatigue (4%), and appetite loss (2%). Common cutaneous manifestations were papules (97%), vesicles (95%), pustules (35%), crusts (29%). And mucosal involvement was observed in 6% of the patients. 5. Associated conditions of chickenpox were observed for 31 patients (31%); renal diseases (8%), dermatologic diseases (5%), hepatic diseases (4%), hypertension (4%), diabetes mellitus (3%) and so on. 6. The most common abnormal laboratory findings was abnormality of liver function test (23%). 7. The most common complications of chickenpox was secondary infections (12%), and others were acute pharyngotonsillitis (4%), viral pneumonia (4%), hepatitis (2%), keratoconjunctivitis (2%). Conclusion: Our data showed that the complications and laboratory abnormalities of chickenpox in adults are more common than in childhood. (Korean J Dermatol 2010;48(4):272~277)
이건홍 ( Gun Hong Lee ),김성근 ( Sung Keun Kim ),이성열 ( Sung Yul Lee ),이종석 ( Jong Suk Lee ),박영립 ( Young Lip Park ),황규왕 ( Kyu Uang Whang ) 大韓皮膚科學會 2009 대한피부과학회지 Vol.47 No.11
Cutaneous manifestations of secondary syphilis vary widely. Nodular lesions and condyloma lata on multiple sites are an uncommon presentation. A 34-year-old man presented with a 1-month history of multiple nodules and papules on the chest and multiple erythematous whitish nodules with maceration on the perineal area and anus, oral cavity, and umbilicus. On the basis of a serologic test for syphilis and skin biopsy, nodular syphilid and condyloma lata was confirmed. We report an unusual case of secondary syphilis that presented with multiple nodular syphilid on the chest and multiple condyloma lata arising in the perineum, anus, oral cavity, umbilicus. (Korean J Dermatol 2009;47(11):1324~1327)
Thermodynamic promoter effects on the phase equilibrium of BFG(Blast Furnace Gas) hydrate
이보람(Lee, Bo Ram),사정훈(Sa, Jeong-Hoon),박다혜(Park, Da-Hye),곽계훈(Kwak, Kye-Hoon),이건홍(Lee, Kun-Hong) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.11
CO₂ separation from a flue gas by using the gas hydrate technology was suggested by Kang et al. They reported phase equilibrium conditions of mixed gases composed of CO₂ and N2 with THF as a thermodynamic promoter. In this study, we reported the phase equilibrium conditions of a mixed gas which had a realistic composition of the blast furnace gas (BFG) emitted from the steel-making process. The phase equilibrium measurements were done by using the continuous QCM method, and the results demonstrate that this method is efficient and as accurate as the conventional temperature search method.
QCM(Quartz Crystal Microbalance)을 이용한 가스 하이드레이트 상평형 측정 방법
이보람(Lee, Bo Ram),사정훈(Sa, Jeong-Hoon),박다혜(Park, Da-Hye),이건홍(Lee, Kun-Hong) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11
가스 하이드레이트는 물분자와 저분자량의 가스분자가 고압과 저온에서 수소결합을 이루며 형성되는 결정성 화합물을 말한다. 최근 가스 하이드레이트의 물리적 특성과 형성 원리를 이용하여 다양한 분야로의 적용 연구가 수행되고 있는데 이의 효과적 달성을 위해서는 가스 하이드레이트의 상평형 연구가 필수적이다. 기존에 수행되는 상평형 실험 방법은 온도의 변화에 따라 하이드레이트를 해리시키고 압력의 변곡점을 찾는 것으로 최소 24시간이 소요되지만, 본 연구진이 제안하는 QCM을 이용한 방법은 1 ng의 무게에 1 Hz의 변화를 나타내는 수정진동자의 민감성을 이용한 것으로 약 2~3시간 내에 상평형 실험을 수행할 수 있고, 하이드레이트의 기억효과(Memory Effect)를 이용하여 연속적인 상평형 실험도 가능하다. 본 연구에서는 QCM 반응기의 원리 및 실험 방법에 대하여 설명하고 열역학적 촉진제를 첨가한 상평형 실험결과를 제시함으로써 상대적으로 저렴한 가격으로 다양한 촉진제와 억제제 첨가 시 나타나는 상평형 효과를 빠른 시간 내에 선별할 수 있는 방법으로 QCM을 이용한 방법을 제안하고자 한다.
무인 자동차를 위한 점 항법과 영상 기반 차선 검출을 융합한 차선 유지 시스템 개발
이웅희(Unghui Lee),이건홍(Keonhong Lee),윤상열(Sangyol Yoon),심현철(Hyunchul Shim),조성호(Sungho Jo) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
This paper presents a robust lane detection algorithm based on RGB color and combined with way point navigation during autonomous vehicle control in real-time. The vehicle in lateral is modeled with sliding mode control and neuron structure. The autonomous vehicle follows the way point and keeps the lane itself. The Experimental results demonstrate the our algorithms