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다층용접배관 용접부에서 균열닫힘현상을 고려한 피로균열성장특성 평가
김철한,조선영,배동호,Kim, Cheol-Han,Jo, Seon-Yeong,Bae, Dong-Ho 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.5
To obtain representative fatigue crack growth characteristic curve in residual stress field, fatigue crack growth test was carried out at various stress ratio and fatigue crack growth characteristic curve was represented using crack closure concept. Obtained results are as follows;K(sub)op/K(sub)max was independent of K(sub)max when R was lower than 0.5 and crack closure phenomenon was not observed when R is higher than 0.5. therefore neglecting crack closure behaviour, actual fatigue crack growth rate can be underestimated. Thus, considering crack closure phenomenon, fatigue crack growth characteristics curve of A 106 Gr B Steel weldment can be effectively estimated.
김철한,김현성,Kim, Chul-Han,Kim, Hyun-Sung 대한성형외과학회 2010 Archives of Plastic Surgery Vol.37 No.6
Purpose: Ganglion cysts of peripheral nerve are uncommon. Ganglion cysts located within the nerve and extraneural ganglia that cause symptomatic nerve compression have been reported. We report an unusual case of epineural ganglion cyst confined to the epineurium of the sural nerve at the foot. Methods: A 45-year-old woman was referred because of a mass on the foot. She had six months' history of pain and numbness in the right small toe. During the examination of the lesion, multinodular cystic mass was identified arising from the epineurium of the sural nerve. The nerve fascicles were compressed by the cyst, but the cyst wall clearly did not invade the fascicle. With the aid of surgical microscope, the epineural cyst was completely excised along with epineural tissue to which it was attached, and the sural nerve was decompressed. There was no relationship between the cyst and either the joint capsule or tendon sheath. Since the cyst was on the periphery of the nerve it was possible to remove the cyst intact without damaging the underlying fascicles. Results: The postoperative course was uneventful. Pathologic examination showed a ganglion cyst with a degenerated collagen fibers and contained a yellowish, jelly-like mucinous substance. No neural elements were identified within the cystic wall. Her sensory impairment improved progressively. At the 15 months follow-up, she was asymptomatic with no neurological deficits. Conclusion: Rarely, ganglion cysts can involve peripheral nerves, leading to varing degrees of neurological deficits. Intraneural intrafascicular ganglion may be difficult to separate from the neural elements without nerve injury. Epineural ganglion, subcategorized as intraneural extrafascicular ganglion, can be removed without damage to the underlying nerve.
펠티어 소자를 사용한 Low Drift Flux Meter의 기초연구
김철한,허진,신광호,사공건,Kim, Chul-Han,Heo, Jin,Shin, kwang-Ho,Sa-Gong, Geon 한국전기전자재료학회 2001 전기전자재료학회논문지 Vol.14 No.11
Fluxmeter is a measuring instrument the magnetic flux intensity by means of an integration of the voltage induced to a search coil to unit time. It also is required to a precise integrator since the voltage induced to a search coil has a differential value of the flux ${\Phi}$ to unit time. In this study, a bias current which is a main problem of the integrator in a drift troublesome depending on the temperature of a FET is investigated. We have confirmed that the temperature dependence of both the bias current of a integrator using the FET and the reversal saturated current of the minor carrier in a P-N junction of a semiconductor were the same. The property of a commercial integrator goes rapidly down with increasing temperature. The bias current of a FET is increased twice as much with 10$^{\circ}C$ increment. As a result, the low drift integrator could be developed by setting the lower temperature up with a pottier device.
Prednisolon 사용 후 발생한 대상포진상 카포시 육종의 치험례
김철한 ( Chul Hann Kim ),김대현 ( Dae Hyun Kim ),전진석 ( Jin Seok Jeon ),강상규 ( Sang Gue Kang ),김동욱 ( Dong Wook Kim ),조문균 ( Moon Kyun Cho ) 대한피부과학회 2009 대한피부과학회지 Vol.47 No.5
Kaposi`s sarcoma is a rare lympho-angioproliferative neoplasm with four types of variants: classic, iatrogenic immunosuppressive drug-associated, AIDS-related and Africa-endemic Kaposi`s sarcoma. Most immunosuppressive drug-associated Kaposi`s sarcomas usually occur after a kidney transplant or after receiving immunosuppressive therapy. A 64-year-old female patient showed numerous purpuric nodules and smaller erythematous plaques on the right lower leg for three months. Previously, the patient was treated with an immunosuppressive drug for rapidly progressive glomerulonephritis for a five-week period. A skin biopsy was performed under the clinical diagnosis of Kaposi`s sarcoma. We performed immunohistochemical staining and polymerase chain reaction to detect human herpes virus 8 (HHV-8). We report a case of iatrogenic immunosuppressive drug-associated zosteriform Kaposi`s sarcoma that rapidly occurred five weeks after prednisolon therapy in a rapidly progressive glomerulonephritis patient. (Korean J Dermatol 2009;47(5):583~587)
김철한 ( Chul Hann Kim ),김정은 ( Jung Eun Kim ),김성근 ( Sung Keun Kim ),조문균 ( Moon Kyun Cho ) 대한피부과학회 2010 大韓皮膚科學會誌 Vol.48 No.8
Amelanotic melanomas comprise only 2% of malignant melanomas and are commonly a difficult clinical diagnosis, due to the lack of melanin pigment typically found in melanomas. Even rarer is the amelanotic malignant melanoma, which may clinically mimic a variety of other less serious cutaneous lesions such as erythema or pruritus, and therefore misdirecting the clinician toward improper treatments and frequently delaying necessary diagnostic biopsy. We report a rare case of amelanotic melanoma occurring in the left retromandibular area with a poor prognosis. A 73-year-old woman presented with a 3-year history of a erythematous lesion in the left retromandibular area. The lesion was surgically removed and biopsy was performed. The biopsy specimen showed atypical, pleomorphic tumor cells with little melanin pigment. On immunohistochemical study, the tumor cells were positive for S-100 protein, HMB-45 and Melan-A. These findings were consistent with amelanotic malignant melanoma. On positron emission tomography/computed tomography (PET/CT), hypermetabolic lesions were found in both the axillary lymph nodes. She was treated with chemotherapy. But four months later, the patient died. Amelanotic melanoma is extremely rare and is more aggressive than pigmented lesions in the similarly stage. The absence of pigmentation in the tumor may result in diagnostic confusion. The clinician should be familiar with the presentation of amelanotic malignant melanoma to facilitate prompt diagnosis. Early diagnosis is crucial since survival is related to tumor thickness and tissue invasion. (Korean J Dermatol 2010;48(8):714~717)
출산유형이 산모의 골반변위에 미치는 영향에 관한 방사선학적 연구
김철한(Cheol-han Kim),김희준(Hui-jun Kim),신병철(Byung-cheul Shin),김정연(Jeong-Yeon Kim) 척추신경추나의학회 2004 대한추나의학회지 Vol.5 No.1
Objective : Women can be affected physically and psychologically by pregnancy and delivery. Because the relaxation of pelvic ligaments has a chance to cause pelvic deviation, we investigated the radiological peivic deviation according to delivery types and experiences. Method : 71 patients were evaluated by X-ray findings. Every patients divided into two group according to delivery types and experiences. After measured innominate measurment, off centering measurement, sacral ala measurement and ilium shadow measurement, X-ray findings in each group were analyzed statistically. Results and Conclusions : It was concluded that the ilium was more deviated into outer side in normal delivery group than caesarean operation group, and more deviated into inner or outer side in multipara group than primipara group.