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원종훈 ( Jong Hoon Won ),현동녘 ( Dong Nyeok Hyun ),박준수 ( Joon Soo Park ),정현 ( Hyun Chung ) 대한피부과학회 2008 대한피부과학회지 Vol.46 No.6
Angiokeratoma of Fordyce is a relatively common type of angiokeratoma that is characterized by small, multiple, purplish to dark red papules on the scrotum. Pathogenesis is unknown, but it has been suggested that increased venous pressure caused by varicocele, hernia or tumor of the epididymis can induce angiokeratoma of Fordyce. We report a case of unilateral angiokeratoma of Fordyce with varicocele in a 30 year-old man. He presented with approximatly 2 mm sized, purplish to dark red, and multiple hyperkeratotic papules on the left scrotum. The lesions were strictly limited to the left side of the scrotum and associated with varicocele on the same side. Histopathologically, hyperkeratosis, acanthosis with elongation of rete ridges and dilated papillary vessels are presented. Based on this clinical and histologic finding, we diagnosed this case as unilateral angiokeratoma of Fordyce with varicocele. The patient was treated with varicocelectomy for left varicocele and then cryotherapy for skin lesions. (Korean J Dermatol 2008;46(6):831∼834)
원종훈 ( Jong Hoon Won ),이민중 ( Min Jung Lee ),박준수 ( Joon Soo Park ),정현 ( Hyun Chung ) 대한피부과학회 2009 大韓皮膚科學會誌 Vol.47 No.1
We report here on a case of the giant and hyperkeratotic variant of porokeratosis. A 51-year-old man presented with a 30×20 cm sized extremely hyperkeratotic brownish verrucous plaque on his buttock. Histologic examination showed an increased number and size of the cornoid lamella, which displayed packed parakeratotic cells and the partial loss of the underlying granular layer. We diagnosed the patient with the giant and hyperkeratotic variant of porokeratosis on the basis of the clinical features and the characteristic histologic findings. Giant porokeratosis is a rare clinical condition among the several subtypes of porokeratosis, and the hyperkeratotic variant is an extremely rare clinical condition. (Korean J Dermatol 2009;47(1):101~103)
A Maximum Likelihood Estimator Based Tracking Algorithm for GNSS Signals
원종훈(Jong-Hoon Won),Thomas Pany,Bernd Eissfeller 한국항해항만학회 2006 한국항해항만학회 학술대회논문집 Vol.2 No.-
This paper presents a novel signal tracking algorithm for GNSS receivers using a MLE technique. In order to perform a robust signal tracking in severe signal environments, e.g., high dynamics for navigation vehicles or weak signals for indoor positioning, the MLE based signal tracking approach is adopted in the paper. With assuming white Gaussian additive noise, the cost function of MLE is expanded to the cost function of NLSE. Efficient and practical approach for Doppler frequency tracking by the MLE is derived based on the assumption of code-free signals, i.e., the cost function of the MLE for carrier Doppler tracking is used to derive a discriminator function to create error signals from incoming and reference signals. The use of the MLE method for carrier tracking makes it possible to generalize the MLE equation for arbitrary codes and modulation schemes. This is ideally suited for various GNSS signals with same structure of tracking module. This paper proposes two different types of MLE based tracking method, i.e., an iterative batch processing method and a non-iterative feed-forward processing method. The first method is derived without any limitation on time consumption, while the second method is proposed for a time limited case by using a 1st derivative of cost function, which is proportional to error signal from discriminators of conventional tracking methods. The second method can be implemented by a block diagram approach for tracking carrier phase, Doppler frequency and code phase with assuming no correlation of signal parameters. Finally, a state space form of FLL/PLL/DLL is adopted to the designed MLE based tracking algorithm for reducing noise on the estimated signal parameters.
가성가성 부갑상선 기능저하증 환자에서 발생한 올브라이트 유전성 골이영양증 2예
원종훈 ( Jong Hoon Won ),현동녘 ( Dong Nyeok Hyun ),박준수 ( Joon Soo Park ),정현 ( Hyun Chung ),정의달 ( Eui Dal Jung ) 대한피부과학회 2009 대한피부과학회지 Vol.47 No.7
A 36 year-old man and his 6 month-old daughter presented with multiple, slightly depressed, skin-colored, hard nodules and plaques on the abdomen, back, and both extremities. They also showed abnormal physical appearance, including short stature and neck, round face, and short digits, which suggested Albright`s hereditary osteodystrophy (AHO). Histopathologically, various sized bony spicules were present in the dermis. The laboratory results showed normal serum calcium, phosphorus and parathyroid hormone levels. On the basis of clinical, laboratory and histologic findings, we diagnosed these cases as Albright`s hereditary osteodystrophy with cutaneous ossification occurring in pseudopseudohypoparathyroidism. (Korean J Dermatol 2009;47(7):820~824)
쇼핑동기요인이 고객만족에 미치는 영향: 반려동물 온라인 쇼핑몰을 중심으로
원종훈(Jong-Hoon Won),이주헌(Joo-Heon Lee) 한국콘텐츠학회 2021 한국콘텐츠학회논문지 Vol.21 No.8
본 연구의 목적은 국내 최초로 반려동물 온라인 쇼핑몰 고객의 쇼핑동기요인들의 고객만족에 대한 영향을 국내 최초로 살펴보고 고객들이 양육하는 반려동물 수가 쇼핑동기요인들의 고객만족에 대한 영향력을 조절하는 효과에 대해 분석하는 것이다. 반려동물 쇼핑몰 고객들의 쇼핑동기요인은 요인분석결과 편의적, 경제적, 쾌락적, 제품특성적, 정보지식적 쇼핑동기의 5개 요인으로 구분되었다. 다중회귀분석을 통해 반려동물 온라인 쇼핑몰 고객의 편의적 쇼핑동기와 정보지식적 쇼핑동기는 고객만족에 유의한 정(+)의 영향을 미치는 것으로 나타났다. 위계적 회귀분석결과 지식정보적 쇼핑동기와 고객만족 간의 관계에서 반려동물 수의 조절효과가 있는 것으로 나타났다. The purpose of this study is, for the first time in Korea, to examine the effects of companion animal online shopping motivation factors on customer satisfaction. In addition, we analyzed the moderating effect of the number of companion animals raised. The factor analysis of survey data yields the following five dimensions: convenience, economic, hedonistic, product characteristics, and information-knowledge shopping motivation. Multiple regression analysis shows that both convenience shopping motivation and information-knowledge shopping motivation have significant positive (+) effects on customer satisfaction. As a result of hierarchical regression analysis, it was found that there is a moderating effect of the number of companion animals raised on the relationship between information-knowledge and customer satisfaction.