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Study on the Oxidation Treatment of Nanoparticles for the Critical Heat Flux
Woo-Joong Kim(김우중),Yong-Han Jeon(전용한),Nam-Jin Kim(김남진) 한국태양에너지학회 2017 한국태양에너지학회 논문집 Vol.37 No.6
Pool boiling, one of the key thermal-hydraulics phenomena, has been widely studied for improving heat transfer efficiencies and safety of nuclear power plants, refrigerating systems, solar-collector heat pipes, and other facilities and equipments. In the present study, the critical heat flux (CHF) and heat-transfer coefficients were tested under the pool-boiling state using graphene M-5 and M-15 nanofluids as well as oxidized graphene M-5 nanofluid. The results showed that the highest CHF increase for both graphene M-5 and M-15 was at the 0.01% volume fraction and, moreover, that the CHF-increase ratio for small-diameter graphene M-5 was higher than that for large-diameter graphene M-15. Also at the 0.01% volume fraction, the oxidized graphene M-5 nanofluid showed a 41.82%-higher CHF-increase ratio and a 26.7%-higher heat-transfer coefficient relative to the same nanofluid without oxidation treatment at the excess temperature where the CHF of distilled water occurs.
김우중 ( Woo Joong Kim ),이경렬 ( Kyung Real Lee ),이상은 ( Sang Eun Lee ),이희정 ( Hee Jung Lee ),윤문수 ( Moon Soo Yoon ) 대한피부과학회 2012 대한피부과학회지 Vol.50 No.9
Background: Impetigo is a common bacterial infection caused by Staphylococcus aureus, and group Ab-hemolytic Streptococcus or both. Recently, S. aureus has been reported as the most frequently isolated pathogen of impetigo and the incidence of methicillin-resistant S. aureus (MRSA) among patients with impetigo has increased. Objective: To investigate the predominant microorganism and the antibiotic susceptibility of the impetigo causative pathogen. Methods: Bacterial culture and antimicrobial susceptibility testing were performed in patients with impetigo from June 2006 to May 2012. Results: Of 164 patients, bacteria were cultured from 139 patients. Among them, S. aureus was isolated from 114 (82%) patients. The others were Acinetobacter baumannii, Enterobactercloacae, Enterococcus species, Enterococcus faecium, Enterococcus faecalis, Klebsiella oxytoca, and Candida albicans. The resistance rates of S. aureus against antibiotics were as follows: penicillin, 95.6%; erythromycin, 43.9%; fusidicacid, 38.1%; clindamycin, 24.5%; gentamycin, 21%; tetracycline, 12.3%; trimethoprim-sulfamethoxazole, 0.9%; ciprofloxacin, 0%; habekacin, 0%; linezolid, 0%; teicoplanin, 0%; and vancomycin, 0%. Thirty-four (29.8%) S. aureus isolates were MRSA, and the prevalence of MRSA increased during the 6-year period. Conclusion: The most predominant pathogen in impetigo was S. aureus, which was sensitive to ciprofloxacin, habekacin, linezolid, trimethoprim-sulfamethoxazole, teicoplanin, and vancomycin. An increase in the prevalence of MRSA was observed during the 6-year period, and the effective antibiotics for MRSA were trimethoprim-sulfamethoxazole, teicoplanin and vancomycin.
위에 발생한 Inflammatory Fibroid Polyp의 내시경적 절제
김우중(Woo Joong Kim),이명석(Myung Seok Lee) 대한소화기학회 1993 대한소화기학회지 Vol.25 No.1
Inflammatory fibroid polyp is a benign localized lesion of the gastrointestinal tract, characterized by distinctively arranged fibrous tissue and blood vessels, with an inflammatory infiltrates often dominated by eosinophils. Even with the widespread use of fiberoptic endoscopy, fibroid polyp is being recognized with extremely rare frequency. We herein report a case of inflmmatory fibroid polyp of the stomach, which was successfully removed by endoscopic polypectomy.
동맥류성 변형과 비정형성 변형을 보인 낭종 형태의 혼합형 피부섬유종
김우중 ( Woo Joong Kim ),최세림 ( Se Rim Choi ),이희정 ( Hee Jung Lee ),윤문수 ( Moon Soo Yoon ),김동현 ( Dong Hyun Kim ) 대한피부과학회 2010 대한피부과학회지 Vol.48 No.9
Dermatofibroma is a common benign fibrohistiocytic tumor that mainly presents as a brown papule or nodule. However, it can sometimes present with diverse clinical forms such as a cyst. Combined dermatofibroma is defined as a tumor that comprises two or more variants of dermatofibroma in a single lesion. We herein report on a case of combined dermatofibroma in a 40-year-old woman who presented with a cyst form on her lateral neck. The histological findings included the combined features of the aneurysmal and atypical variants of dermatofibroma such as cleft-like spaces with hemorrhage, some pleomorphic cells and multinucleated giant cells, as well as a feature of typical dermatofibroma. (Korean J Dermatol 2010;48(9):810~813)
김우중 ( Woo Joong Kim ),김진기 ( Jin Ki Kim ),이희정 ( Hee Jung Lee ),윤문수 ( Moon Soo Yoon ),김동현 ( Dong Hyun Kim ) 대한피부과학회 2012 대한피부과학회지 Vol.50 No.2
Turner`s syndrome (TS) is a genetic disorder caused by numeric and/or structural abnormalities of the X chromosome. It is characterized by a short stature, gonadal dysgenesis, and frequently by webbed neck, cubitus valgus, lymphedema, broad chest with wide spaced nipples, micrognathia, and brachimetacarpalia. Several cutaneous manifestations are associated with TS, including melanocytic nevi, hypertrophic scarring, and vitiligo. Rarely reported findings include hemangiomas, angiokeratomas, and halo nevi. We present a case of halo nevi and vitiligo in a 13-year-old girl with TS. To the best of our knowledge, halo nevi and vitiligo in TS has not been reported in the Korean literature. (Korean J Dermatol 2012;50(2):175~178)