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송기훈 ( Ki Hun Song ),조용선 ( Yong Sun Cho ),황수란 ( Su Ran Hwang ),김한욱 ( Han Uk Kim ),윤석권 ( Seok Kweon Yun ),박진 ( Jin Park ) 대한피부과학회 2012 대한피부과학회지 Vol.50 No.1
Halo nevus is a pigmented nevus surrounded by a round or oval depigmentation. Of patients with halo nevus, 18 to 26% patients have vitiligo, either involving the nevus or at a distant site. While the exact etiology of halo formation and vitiligo is unknown, several theories suggest that common immunologic mechanisms are involved in the destruction of melanocytes of both phenomena. Unlike common melanocytic nevus, congenital nevus associated with both halo formation and concurrent extralesional vitiligo is very uncommon and only one case has been reported in the Korean dermatological literature. A 19-year-old female presented with surrounding depigmentation around a congenital hairy nevus on the left forearm. Simultaneously, vitiligo appeared on the lowerabdomen and surrounding regions of both areola. The halo depigmented lesion around congenital nevus and the periareolar vitiliginous lesion shared some histological and immunohistochemical features. These findings further support common immunological mechanisms of pigment destruction in both phenomena. (Korean J Dermatol 2012;50(1):43∼48)
송기훈 ( Ki Hun Song ),김주익 ( Joo Ik Kim ),남경화 ( Kyung Hwa Nam ),박진 ( Jin Park ),윤석권 ( Seok Kweon Yun ),김한욱 ( Han Uk Kim ) 대한피부과학회 2012 大韓皮膚科學會誌 Vol.50 No.10
Solid facial edema is a rare skin condition characterized by persistent, non-pitting, and non-tender edema on the forehead, glabellar region, mid-face, nasolabial folds, and cheeks. Exact etiology is still unknown; however, it is suggested that it can be secondary inflammatory response due to acne vulgaris. A 21-year-old male presented with erythematous swollen patches on the forehead and glabellar region. He had been intermittently treated for his acne vulgaris for 5 years at the local clinic. Focal soft tissue swelling with thickening of the skin and subcutaneous tissue was identified radiologically. Histopathologically, lymphatic vessels were dilated with chronic inflammatory cell infiltration and dermal edema. To the best of our knowledge, this is the first reported case of solid facial edema caused by acne vulgaris in Korea.
융기성 피부섬유육종의 치료를 위한 광범위절제술과 모즈 미세도식 수술의 비교 연구: 단일 기관의 경험
송기훈 ( Ki Hun Song ),박진 ( Jin Park ),윤석권 ( Seok Kweon Yun ),김한욱 ( Han Uk Kim ),노시균 ( Si Gyun Roh ),이내호 ( Nae Ho Lee ) 대한피부과학회 2013 대한피부과학회지 Vol.51 No.1
Background: Dermatofibrosarcoma protuberans is a mesenchymal tumor of the skin of intermediate-grade which is a rare condition. The slow growing and aggressive invasion on local tissues are characteristic features of dermatofibrosarcoma protuberans. The treatment for dermatofibrosarcoma protuberans is mainly a surgical excision such as a wide excision and Mohs micrographic surgery. Objective: The aim of this study was to compare the result of wide excision and Mohs micrographic surgery for the treatment of dermatofibrosarcoma protuberans at a single institution in Korea. Methods: A retrospective review was done for 24 patients diagnosed with dermatofibrosarcoma protuberans and treated surgically from 1999 to 2010 at Chonbuk National University Hospital. Patient demographics, tumor features, surgical features, and recurrence during the follow-up period were evaluated. Results: 13 patients were treated with wide excision, and 11 with Mohs micrographic surgery. There was no metastasis for all the cases. Mean operation time for the wide excision group was 83 minutes whereas 182 minutes for the Mohs micrographic surgery group, and it was a statistically significant difference. However, no significant difference was observed in post-operative defect size, advanced surgical repair and local recurrence in our study. Conclusion: We suggest that wide excision and Mohs micrographic surgery are both successful modalities for the surgical treatment of dermatofibrosarcoma protuberans. Hence, individualized patient and tumor characteristics should be concerned when determining the surgical options for dermatofibrosarcoma protuberans. (Korean J Dermatol 2013;51(1):13∼20)
이상민,송기훈,장윤석,최재붕,김영진,한상인,최송천,Lee Sang-Min,Song Ki-Hun,Chang Yoon-Suk,Choi Jae-Boong,Kim Young-Jin,Han Sang-In,Choi Song-Chun 대한기계학회 2005 大韓機械學會論文集A Vol.29 No.10
API 581 guideline provides a methodology for calculating the risks of equipments in refinery or petrochemical plant. However, especially in part of the consequence of failure, there is a major limitation of its application to the petrochemical plant directly since only a representative material is considered in calculating the risk while the equipment is composed of numerous materials. The objectives of this paper are to propose an enhanced risk-based inspection (RBI) technique to resolve shortcomings inclusive of the above issue and to assess the risks of typical petrochemical equipments. In this respect, a program incorporating material database was developed to fully incorporate the characteristics of different materials. The proposed RBI program consists of qualitative, semi-quantitative and quantitative risk evaluation modules in which toxic materials as well as representative materials were selected automatically for comparison to those in the current guideline. It has been applied to assess the risks of equipments in ethylene facilities of petrochemical plants. Thereby, more realistic evaluation results were obtained and applicability of the proposed RBI program was proven.
NCC플랜트 위험도기반검사에 따른 평가결과의 신뢰성 연구
이창헌(Chang-Hun Lee),최송천(Song-Chun Choi),이재훈(Jae-Hun Lee),송기훈(Ki-Hun Sonng),김정규(Jung-Kyu Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
The important requirements related to a risk management in the industrial sector are improvement in quality and effective of an inspection and costs reduction. In order to satisfy such requirements, there is RBI (Risk Based Inspection) as a high technology. The core purpose of this study is to acquire efficiency and costs reduction of the inspection by establishing a RBI Program. RBI is a method that basis the order of priority on risk about operation and efficiency of inspection program and is defined as combination of damage result and the corrosion rate. The TMSF (Technical Module SubFactor) value that based on the corrosion speed from a corrosion rate is the key factor to estimate the remaining life, and it is possible to estimate the quantized value and the flow rate value to estimate other quantized risk on the operating NCC plant as well as pipe or an apparatus that are difficult to acquire a corrosion rate by screen questioning the concerned specialists based on the substance information of the TMSF value. In the NCC plant, therefore, a study is needed on the effective risk by comparing the quantized corrosion rate value and screen questioning value using the RBI Program of a heat exchanger tube.