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RISS 인기검색어
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- 저자 : 이정환(Jeong-Hwan Lee) (검색결과 462 건)
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Al 7050 단조품 표면의 입도성장층 방지에 관한 연구
이정환,이상용,이영선,Lee, Jeong-Hwan,Lee, Sang-Yong,Lee, Yeong-Seon 한국기계연구원 1996 硏究論文集 Vol.26 No.-
Age hardenable aluminium alloys show high specific strength, good thermal and electrical conductivity as well as lightness, and are typical aircraft materials. High fatigue strength and good resistancy against stress corrosion cracking are also important for aircraft aluminium alloys. Al alloy 7050 has been developed to meet the above mentioned requirements and the use of this alloy as forged aircraft part becomes more important. However, forged 7050 parts showed undersiable structures such as severe local grain coarsening in surface area and unproper metal flow that is degrading mechanical properties. In this paper, microstructural aspects of die forging in the Al alloy 7050 are investigated. Also suggested are the optimal forging conditions for microstructural control of Al alloy 7050.
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A Case of Metastatic Eccrine Porocarcinoma with a Review of the Literatures
이정환,임주한,김루시아,김철수,이현규,나소연,김성현,정지중,이명동,예재호,이문희,Lee, Jung-Hwan,Lim, Joo-Han,Kim, Lucia,Kim, Chu-Soo,Yi, Hyeon-Gyu,Nah, So-Yun,Kim, Seong-Hyun,Jeong, Ji-Joong,Lee, Myung-Dong,Ye, Jea-Ho,Lee, Moon-Hee The Korean Society for Head and Neck Oncology 2011 대한두경부 종양학회지 Vol.27 No.2
에크린 한공암종은 흔하지 않으며, 전이성 에크린 한공암종은 매우 드문 암이다. 에크린 한공암종은 표피내 한관에서 기원하는 피부 부속기 악성 종양으로, 대부분 에크린 한공암종은 항암치료와 방사선치료에 효과가 없으며, 따라서 유일한 치료방법은 전이되기 전에 국소 및 광범위 절제술을 시행하여야 한다. 본 환자는 두피에 발생한 에크린 한공암종이 점점 진행하여 피부, 림프절, 폐 등으로 전이하였고, 다수의 광범위 절제술에 이어 항암치료와 방사선치료를 받았지만, 결국 폐전이가 악화되어 사망하였다. 본 저자들은 항암치료와 방사선치료에 불응한 에크린 한공암종 1예를 치료에 대한 문헌고찰과 더불어 보고하는 바이다.
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탈모증 유발요인과 한의학적 치료 효과에 대한 후향적 연구 - 후천적 열성 탈모를 중심으로 -
이정환,장진영,윤영준,조아라,신현진,정상욱,정연호,강여름,Lee, Jung-Hwan,Jang, Jin-Young,Yoon, YoungJoon,Cho, Ah-Ra,Shin, Hyun-Jin,Jung, Sang-Uk,Jeong, Yeon-Ho,Kang, Yeo-Reum 대한한방안이비인후피부과학회 2013 한방안이비인후피부과학회지 Vol.26 No.2
Objectives : The purpose of this study is to report the causes and the effects of korean medicine treatment on alopecia. Methods : 1050 patients with alopecia, who had visited oriental medical clinics from July 2011 to October 2012, were analyzed by self-assessments. And 153 patients of them were treated with korean medicine treatment for 3 months. Treatment results were evaluated by patients' self-assessments and global & enlarged photographic reviews. Results : 1. The gender ratio of male to female was 2:1 and most patients belonged to the 20~30 year old group. 2. Family history of baldness in alopecia patients was a total of 57.3%, paternal 44.4% and maternal 21.2%. 3. Subjective symptoms of fever in parietal region was a total of 97.4% in alopecia patients. 4. After 1 month treatment, the fever in the parietal region was decreased by 37.3% of patients. And their subjective hair loss was also significantly decreased. 5. After 3 months of treatment, the global photographic review was improved by 56.2% of the patients and the enlarged photographic review was significantly improved by 5.2% in patients' total hair count. Conclusions : A significant number of alopecia patients were young and less relative in genetic alopecia causes was less relevant than the past. Recent causes of alopecia were more concerned with the fever in parietal region. According to that reason, cooling effect korean medicine treatment was expected to be effective for febrile alopecia, and actually had significant effects on this study. For future studies, it's long term treatment and follow up studies are needed.
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재발하였거나 수술적 제거가 불가능한 뇌수막종에 대한 Hydroxyurea 치료 - Preliminary Report -
이정환,김오룡,김성호,배장호,최병연,조수호,Lee, Jeong-Hwan,Kim, Oh-Lyong,Kim, Seong-Ho,Bae, Jang-Ho,Choi, Byung-Yon,Cho, Soo-Ho 대한신경외과학회 2001 Journal of Korean neurosurgical society Vol.30 No.1
Objectives : The present study was performed to analyze results of hydroxyurea treatment for unresectable and recurrent meningiomas as adjuvant chemotherapeutic agent. Material and Methods : Among 87 cases of meningioma patients who treated surgically between Jauary 1988 and December 1997 in our department, unresectable and recurrent cases were 4 cases. Histologically, 3 cases were meningothelial type, 1 case was angiomatous type. Tumor orgin was cerebellopontine angle(CPA) in 3 cases, cavernous sinus in 1 case. Three of 4 cases received radiation treatment. All patients received a daily dosage of 20mg/kg/day of hydroxyurea. Hematological monitorning was performed monthly and tumor measurement was assessed by MR imaging before treatment and every 6 months. Mean follow-up period was 34 months. Rerults : All cases showed no enlargement of tumor mass without any shrinkage. Trigeminal neuralgia in 1 case was improved and external herniation of brain on craniectomy site in 1 case was shrunken. None of the patients had any serious side effects. White blood cell count fell below $3000/{\mu}l$ in 1 case, but recovered 2 weeks later with cessation of medication. Conclusion : Hydroxyurea stopped cell growth by triggering the apoptotic cascade. Our preliminary data indicate that hydroxyurea provides adjuvant medical treatment in patients of unresectable and recurrent meningiomas
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