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비대상성 간경변이 호전된 간세포암종에서 경동맥화학색전술과 고주파열치료술로 병합치료한 증례
유형민 ( Hyung Min Yu ),최원혁 ( Won Hyeok Choe ),권소영 ( So Young Kwon ),김정한 ( Jeong Han Kim ) 대한간암학회 2014 대한간암학회지 Vol.14 No.2
Case Reports : A Case of Hepatocellular Carcinoma with Improved Decompansated Liver Cirrhosis with Combination Treatment of Transarterial Chemoembolization and Radiofrequency Ablation
유형민(Hyung Min Yu),조용근(Yong Geun Cho),권지운(Jiwoon Kwon),한승오(Seung Oh Han) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4
로봇암의 회전 토크를 높이기 위해 사용되는 감속기는 모터, 모션 제어기와 함께 산업용 협동 로봇의 3 대 핵심 부품으로써 로봇의 성능을 결정하는 하나의 중요한 요소이다. 따라서 감속기의 신뢰성은 로봇의 수명을 결정하는 핵심 요소이며 전세계적으로 유명한 선진사 제품의 감속기는 30,000 시간 이상의 내구성을 보증한다. 본 연구에서는 선진사의 감속기 내구 수명을 분석하여 향후 국산 제품의 내구 수명을 결정하는 각 파라미터의 기준을 제시하기 위해 가속계수를 적용한 벤치 테스트를 통해 감속기 표면에서 발생하는 온도와 시험 종료 후 초기 감속비 유지 여부를 분석하였다. 가속계수는 Weibull분포에 기반한 평균 무고장 시간을 산출하고, 하모닉 드라이브의 허용 토크를 고려하여 산출되었으며 시험 결과 감속비의 오차는 5% 미만, 표면 온도는 안정구간에서 60℃를 유지하였다. Harmonic reducer used to enhance the torque of robot arm is one of the core part applied to collaborative industrial robot, and therefore the reliability of this part is crucial to determine the robot performance. In this study, reduction ratio and surface temperature was suggested as parameters to define the functional failure in reliability perspective. The harmonic reducer produced by leading company was studied experimentally by accelerated life testing technique for analyzing the suggested parameters. Acceleration factor was obtained by mean time between failure (MTBF) based on Weibull distribution with consideration of allowable torque for harmonic drive. It was noted that the discrepancy of the reduction ratio is less than 5% and the temperature is maintained at 60℃ in the steady state. Consequently, this result can be used in new reducer development as reliability criteria.
소라페닙 투여 간세포암종 환자에서 항바이러스제 치료의 생존이득
김정한 ( Jeong Han Kim ),유형민 ( Hyung Min Yu ),황용 ( Yong Hwang ),고순영 ( Soon Young Ko ),최원혁 ( Won Hyeok Choe ),권소영 ( So Young Kwon ) 대한간암학회 2016 대한간암학회지 Vol.16 No.1
Background/Aims: Nucleos(t)ide analogues (NAs) help reduce the recurrence rate after the curative treatment of hepatitis B related hepatocellular carcinoma (HCC). Sorafenib has been shown to improve survival of advanced HCC patients. Whether antiviral therapy with NAs could help such patients is unknown. Our aim is to investigate the usefulness of antiviral therapy for advanced-stage HCC treated with sorafenib. Methods: We performed a retrospective cohort study in advanced-stage HCC patients treated with sorafenib between June 2007 and December 2013. Patients in group A (the nonantiviral therapy group) were treated with sorafenib alone. Those in group B (the antiviral therapy group) were treated with sorafenib and NAs. Progression-free survival (PS) and overall survival (OS) were compared between these two groups. Results: Finally, 23 patients in group A and 40 patients in group B were enrolled in the study. The mean number of days of treatment with sorafenib was 79 (34-231) days and 96 (33-449) days for group A and B, respectively (P=0.286). The mean PS of group A and B was 97 (14-449) days and 51 (0-461) days, respectively (P=0.068). The OS was 154 (44-741) days in group A and 138 (30-1,025) days in group B (P=0.665). PS and OS showed no significant difference between the two groups. Conclusions: This study shows that there was no significant survival gain of using antiviral therapy in patients with advanced-stage HCC treated with sorafenib. In consideration of costeffectiveness, antiviral therapy may be not mandatory. (J Liver Cancer 2016;16:23-30)
폐전이를 보인 단일결절형 거대 간세포암종 환자에서 순차적인 경동맥화학색전술과 Sorafenib으로 완전관해를 보인 1예
김기현 ( Gi-hyun Kim ),유형민 ( Hyung-min Yu ),임채준 ( Chae-june Lim ),조성범 ( Sung-bum Cho ) 대한간암학회 2016 대한간암학회지 Vol.16 No.1
Current guidelines recommend sorafenib as the first-line molecular target agent for advanced hepatocellular carcinoma (HCC) with extrahepatic metastasis and unresectable HCC. Sorafenib was reported to show survival benefit for patients with advanced HCC. However, complete response is extremely rare in patients treated with sorafenib. Here, we report a 52-year-old man with advanced HCC and pulmonary metastasis who showed complete response by sequential transarterial chemoembolization and continuous sorafenib. Complete response was sustained for 53-month until now. (J Liver Cancer 2016;16:47-51)
뇌전이를 동반한 간세포암종 환자에서 수술 절제 후 장기 생존을 보인 1예
이정호 ( Jeong-ho Lee ),유형민 ( Hyung-min Yu ),조성범 ( Sung-bum Cho ) 대한간암학회 2016 대한간암학회지 Vol.16 No.1
Brain metastasis is a rare condition of extraheptaic metastases in hepatocellular carcinoma (HCC). Patients with hepatocellular carcinoma and brain metastasis have rapidly worsened neurologic signs and symptoms, therefore it is regarded to oncologic emergency. Current recommended treatments for brain metastasis are surgical resection or gamma-knife surgery with/without whole brain radiation therapy (RT). However, patients with brain metastasis have a very poor prognosis after adequate treatment. Here, we report a 62-year-old man with HCC and brain metastasis who had long term survival after surgical resection and whole brain RT. (J Liver Cancer 2016;16:38-41)
김선웅 ( Sun Woong Kim ),유형민 ( Hyung Min Yu ),이윤정 ( Yoon Jeong Lee ),김희진 ( Hee Jin Kim ),허미나 ( Mina Hur ),이홍기 ( Hong Ghi Lee ) 대한내과학회 2014 대한내과학회지 Vol.87 No.5
Polycythemia vera (PV) is a myeloproliferative neoplasm characterized by erythrocytosis. Clinical symptoms can range in severity from headache and tinnitus to thrombohemorrhagic complications. Neurologic symptoms are common at the onset of polycythemia; however, chorea due to PV is a rare complication. We present the case of a 77-year-old female who was referred to our hospital because of choreic movement of the limbs, head and face. She was diagnosed with JAK2V617F mutation-positive PV. Her chorea was completely resolved by phlebotomy combined with hydroxyurea and aspirin. (Korean J Med 2014;87:619-624)
박수연 ( Su Youn Park ),유형민 ( Hyung Min Yu ),김지완 ( Ji Wan Kim ),안상희 ( Sang Hee An ),김욱연 ( Wook Youn Kim ),허미나 ( Mina Hur ),이홍기 ( Hong Gi Lee ) 대한내과학회 2014 대한내과학회지 Vol.86 No.6
Post-transplantation lymphoproliferative disorder (PTLD) is a serious complication that can develop after either solid organ or hematopoietic stem cell transplantation (HSCT). The incidence of Hodgkin`s lymphoma (HL) ranges from 0.5-1.0% of PTLD after HSCT without T-cell depletion. Here, we report a case of HL-PTLD that occurred after autologous peripheral blood stem cell transplantation for an angioimmunoblastic T-cell lymphoma (AITL). A 36-year-old patient developed fever and chills with multiple lymphadenopathies at day 673 after auto-HSCT for AITL. Three months after the transplant, the patient developed fever with elevated plasma Epstein-Barr virus (EBV)-PCR values. The excisional biopsy revealed HL at Ann Arbor stage IIIB. A total of 8 cycles of chemotherapy with ABVD please define were performed, and the patient has remained disease-free. To our knowledge, this is first case report of HL-PTLD after auto-PBSCT in Korea. (Korean J Med 2014;86:774-780)
스크류 로드 작업 균일도 향상을 위한 견인력 및 스프링백 영향도 분석
한승오(Seungoh Han),강대영(Dae Young Kang),유형민(Hyung Min Yu),김영빈(Young Bin Kim),김수인(Su In Kim),권지운(Jiwoon Kwon),조용근(Yong Geun Cho) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4
스크류 로드는 비트에서 굴착 된 흙을 지상으로 이송 배출하는 역할을 하는 천공기의 핵심 부품이다. 균일한 품질과 장시간의 신뢰성 확보가 가능한 내구성이 핵심요소이나 현재까지의 스크류 조립은 작업자의 노하우에 의지하여 제작되어 왔다. 이와 같이 용접되어 제작된 스크류의 잔류 응력은 스크류 내구성에 부정적인 결과를 초래해왔다. 이러한 문제를 해결하기 위해 다양한 스크류 제작에 필요한 인장력을 유한요소해석을 통해 규정하고, 이를 기반으로 각 스크류를 제작하기 위한 인장력을 선정할 수 있는 실험식과 자동설정 알고리즘을 제시하였다. 또한 이에 따른 잔류응력을 최소화할 수 있도록 스크류 로드에 발생하는 스프링백의 영향을 유한요소해석을 통해 분석하였다. 본 연구결과는 스크류 로드 내구성을 향상시키기 위해 제조 공정의 기초 자료로 활용할 예정이다. The screw rod is a key part of the drilling machine that serves to transport and discharge the soil excavated by the bit. Durability, which enables uniform quality and long-term reliability, is a key factor, but screw assembly so far has been built based on the know-how of the operator. The residual stress of these welded and manufactured screw rods has had negative consequences for screw durability. To solve this problem, we define the tensile force required for the production of various screws through finite element analysis, and based on this, we provide an empirical formula and automatic setup algorithms that can select the tensile force to produce each screw rod. In addition, the effects of spring back on the screw rods were analyzed through finite element analysis to minimize residual stress. The results of this study will be used as a basic data for the manufacturing process to improve screw rod durability.
김영빈(Young Bin Kim),강대영(Dae Young Kang),유형민(Hyung Min Yu),한승오(Seung Oh Han),김수인(Su In Kim),권지운(Ji Woon Kwon),조용근(Yong Geun Cho) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4
본 논문은 굴착기용 전자제어 컨트롤 밸브의 신뢰성 평가를 위한 장비개발 방안을 기술하였다. 현재 개발 중인 굴착기 전자제어 컨트롤 밸브 신뢰성 평가 장비는 100 톤 급 이하 굴착기에 장착되는 컨트롤 밸브에서 발생되는 고장을 파악하기 위해 내구수명 시험과 압력 손실, 내·외부 누유, 스풀 습동, EPPR Valve 응답성, Relief Valve 특성 및 미터링 특성의 성능시험 등이 가능하다. 본 신뢰성 평가 장비 개발 연구를 통해 국산 컨트롤 밸브의 신뢰성 확보를 위한 기초 자료로 활용할 예정이다. This paper describes an equipment development plan for the reliability evaluation of electronic control valves for excavators. Excavator electronic control valve reliability evaluation equipment currently under development is a durability test and pressure loss, internal/external oil leakage, spool sliding, EPPR valve responsiveness, and relief to identify failures occurring in control valves mounted on excavators below 100ton class. It is possible to perform performance tests of valve characteristics and metering characteristics. This reliability evaluation equipment development study will be used as basic data for securing the reliability of domestic control valves.