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조홍기,조금남,윤백,김영생,김정훈,Cho, Hong-Ki,Cho, Geum-Nam,Yoon, Baek,Kim, Young-Saeng,Kim, Jung-Hoon 대한설비공학회 2004 설비공학 논문집 Vol.16 No.9
The present study investigated two-phase flow distribution, phase separation and pressure drop in multi-microchannel tubes under adiabatic condition. The test section consisted of inlet and outlet headers with the inner diameter of 19.4㎜ and 15 parallel microchannel tubes. Each microchannel tube brazed to the inlet and outlet headers and had 8 rectangular ports with the hydraulic diameter of 1.32㎜. The key experimental parameters were orientation of header (horizontal and vertical), flow direction of refrigerant into the inlet header (in-line, parallel and cross flow) and inlet quality (0.1, 0.2 and 0.3). It was found that the orientation of the header had relatively large effect on the flow distribution and phase separation, while the inlet quality didn't affect much on them. The horizontal header showed the better flow distribution and phase separation characteristics than the vertical one. The parallel flow condition with the horizontal header showed the best performance for the flow distribution and phase separation characteristics under the test conditions. Two-phase pressure drops through the microchannel tubes with the horizontal header were higher than those of the microchennel tubes with the vertical header due to gravitational effect.
Voriconazole로 성공적으로 치료한 Scedosporium apiospermum에 의한 피부감염증
조홍기 ( Hong Ki Cho ),이한을 ( Han Eul Lee ),최영진 ( Young Jin Choi ),이상훈 ( Sang Hoon Lee ),황규왕 ( Kyu Uang Whang ),이종석 ( Jong Suk Lee ),이성열 ( Sung Yul Lee ) 대한피부과학회 2013 대한피부과학회지 Vol.51 No.2
Scedosporium apiospermum, an asexual state of Pseudallescheria boydii, is a widely distributed mould that can be found in the soil, manure, stagnant water and decaying vegetation. It has become an emerging pathogen among immunosuppressed patients but it can also cause infections in immunocompetent patients by penetrating trauma. This fungus is a classical cause of mycetoma and the localized skin infections caused by this mould are much rarer than mycetoma. We report a case of cutaneous S. apiospermum infection in a 79-year-old woman. She had erythematous plaque with crust and violaceous supprative nodules on the right forearm. The culture from pus showed typical white to gray colored cottony colonies of S. apiospermum. Treatment was started with voriconazole effectively. Skin lesions completely cured with no reccurence. Thus, voriconazole shows to be an effective treatment for Scedosporium infection. (Korean J Dermatol 2013;51(2):135∼139)
조홍기 ( Hong Ki Cho ),최동칠 ( Dong Chil Choi ),장치진 ( Chi Jin Chang ),송춘호 ( Chun Ho Song ),장동헌 ( Dong Heon Jang ) 전북대학교 농업과학기술연구소 2013 농업생명과학연구 Vol.44 No.2
This study is purposed to build base data of mulberry cultivators by analyzing cultivation type and mulberry cultivar, distribution system, production cost and income. According to the result, the average age and work experience of cultivators were 58.3 and 7.3. They preferred Gwasang2 and Cheongilppong for mulberry cultivars. Furthermore, distribution of mulberry was primarily depending on a direct transaction, internet sales and nonghyup. Environment-friendly cultivators were asking the highest receipt price. They also had larger production quantity with a higher sales price. However, most cultivators invested their labor force in harvesting process. In the future, it would be required to accomplish cultivation techniques training, stable sales system, reasonable harvest time and operation expenses saving.
다양한 피부 종양에서의 β-defensin 1 발현에 관한 연구
조홍기 ( Hong Ki Cho ),황규왕 ( Kyu Uang Whang ),박영립 ( Young Lip Park ),이종석 ( Jong Suk Lee ) 대한피부과학회 2013 대한피부과학회지 Vol.51 No.8
Background: Among antimicrobial peptides produced by keratinocytes, β-defensins and LL-37 are the major human antimicrobial peptides. Because β-defensins have recently received great attention for its roles associated with host defense and cancer development, we hypothesized that β-defensin 1 has an influence on the differentiation and malignant changes of various skin tumors originating from keratinocytes and malignant melanomas. Objective: This study was conducted to measure the expression of β-defensin 1 in different skin tumors. Methods: The expression of β-defensin 1 was examined by immunohistochemical staining of 57 specimens of skin tumors including 12 cases of seborrheic keratosis, 4 cases of keratoacanthoma, 12 cases of actinic keratosis, 10 cases of basal cell carcinoma, 16 cases of squamous cell carcinoma and 3 cases of malignant melanoma. Results: Immunohistochemical analysis of skin tumor tissue samples revealed significantly higher expression of β- defensin 1 in benign skin tumors (seborrheic keratoses, keratoacanthomas) and premalignant lesions (actinic keratoses) than in malignant tumors (squamous cell carcinomas, basal cell carcinomas, and malignant melanomas). Among malignant tumors, basal cell carcinomas and malignant melanomas showed lower expression of β-defensin 1 than squamous cell carcinomas, in which their expression was shown to be decreased with increased dysplasia of the tumor cells. Conclusion: These findings showed that β-defensin 1 has a negative association with malignancies of skin tumors. The role of β-defensin 1 is suggested in the protection of malignant changes including loss of differentiation and dysplasia in skin tumors. (Korean J Dermatol 2013;51(8):586∼592)
이한을 ( Han Eul Lee ),조홍기 ( Hong Ki Cho ),이성열 ( Sung Yul Lee ),이종석 ( Jong Suk Lee ),박영립 ( Young Lip Park ),황규왕 ( Kyu Uang Whang ) 대한피부과학회 2012 대한피부과학회지 Vol.50 No.12
Washboard nail is a dystrophy that presents as a series of ridges that extends across the nail. It is often accompanied by a central depression that extends from the cuticle to the free edge. Washboard nail is often a result of frequently repeated trauma, but sometimes predisposing factors cannot be found. When habitual tic is the cause of the lesions, restraining the habit is the most important treatment. Here, we report a case of a 6-year-old male with washboard nails on both thumbnails and was treated with topical 0.1% tacrolimus ointment. Significant improvement was observed after 4 months of application. This case suggests that topical tacrolimus can be considered as a primary therapy in the treatment of washboard nails in the absence of trauma. (Korean J Dermatol 2012;50(12):1054∼1056)
베냉 여행 후 입국한 외국인에서 발생한 종기성 피부 구더기증
고범준 ( Bum Joon Ko ),조홍기 ( Hong Ki Cho ),이인용 ( In Yong Lee ),용태순 ( Tai Soon Yong ),황규왕 ( Kyu Uang Whang ) 대한피부과학회 2013 대한피부과학회지 Vol.51 No.5
Myiasis is the infestation of any part of the body by Diptera larvae. It is the fourth most common travel-associated skin disease and cutaneous myiasis is the most frequently encountered clinical form. Furuncular lesions may result when the skin is affected. Cutaneous myiasis caused by Cordylobia anthropophaga has been endemic in the sub-Saharan African region for more than 135 years. There have been some reported cases from non-endemic regions, and yet C. anthropophaga infestations are rarely acquired outside of Africa. We report here a rare case of furuncular cutaneous myaisis by C. anthropophaga in a German patient who came to Korea after a three-week trip to Benin.
물류정보시스템 연계를 위한 EPC 기반 PML 메시징 서비스에 관한 연구
정광철(Kwang-Chul Jung),박정선(Jeong-Sun Park),조홍기(Hong-Ki Cho) 한국전자거래학회 2005 한국전자거래학회지 Vol.10 No.3
여러 기업들은 자사의 물류정보시스템을 구축하여 운영 중에 있지만 거래업체간 물류정보시스템 연계를 위한 표준화된 문서 형식이 제공되지 않고 있다. 따라서 업체간 효율적인 관리와 유지를 위해 표준화된 물류정보 연계가 필요하다. 본 연구에서는 공급업체와 협력업체 간의 정보연계를 위하여 차세대 물류 시스템의 중요부분을 담당할 RFID를 활용하여 관련 정보를 e-Mail로 전송함으로 표준화된 물류정보연계의 프로토타입을 제시하였다. 본 연구는 RFID의 발전과 함께 물류정보시스템 연계의 근간이 될 수 있을 것이다. Though many corporations are operating their logistics information systems, standard document forms for the connection of logistics information systems between transaction companies are not provided. Therefore, the standardized logistics information connection is needed for the efficient management. In this study, we provide a prototype for logistics information systems connection by using e-mail which contains RFID and product information. This study could be a basis for logistics information system connection with the advance of RFID.