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조장호,이상곤,조원일,김영채,이성철,이주성,문세기 ( Jang Ho Jo,Sang Gon Lee,Won Il Cho,Young Chai Kim,Sung Chul Yi,Ju Seong Lee,Sei Ki Moon ) 한국공업화학회 1997 공업화학 Vol.8 No.6
알칼리형 연료전지용 라니니켈 수소극에서 카본블랙이 전극 성능 및 촉매층 구조에 미치는 영향을 전기화학적 방법과 질소 흡착법 등을 이용하여 조사되었다. 본 연구에서 라니니켈 수소극 촉매층의 최적 카본블랙 함량은 2wt% 였다. 카본블랙의 첨가는 한계전류밀도를 증가시켰으며, 이는 기액접촉면적의 증가에 기인한 것으로 사료된다. 또한 한계전류밀도에서의 속도결정단계는 수소가 기액접촉면에서 녹는 단계일 가능성이 높은 것으로 조사되었다. The effects of carbon black on the electrodes performance and on the structure of the catalyst layer in Raney nickel hydrogen electrodes for alkaline fuel cells were investigated by using electrochemical and nitrogen adsorption methods. The optimum content of carbon black in the catalyst layer of Raney nickel hydrogen electrode was 2wt%. The limiting current density was increased by the addition of carbon black due to the enlargement of gas-liquid interface area. The rate determining step at the limiting current density was supposed to be a step where hydrogen dissolves at gas-liquid interfaces.
증례 : 혈액종양 ; 성인에서 천미부 기형종의 선암으로 전환 1예
조장호 ( Jang Ho Cho ),김소희 ( So Hee Kim ),김용훈 ( Yong Hoon Kim ),박혜성 ( Heae Surng Park ),조은석 ( Eun Suk Cho ),임재윤 ( Jae Yun Lim ),조재용 ( Jae Yong Cho ) 대한내과학회 2013 대한내과학회지 Vol.85 No.1
천미부 기형종이 성인에서 발견된 경우 반드시 즉시 절제술이 시행되어야 하며 수술적 절제 가장자리가 충분히 확보 되어야 하고 악성화 전환의 위험성 때문에 종양이 분열되지 않게 주의하여야 한다. 현재 보고되어 있는 많지 않은 증례와 본 증례를 비교하였을 때, 기형종 안의 선암으로의 변환된 환자에서 반드시 다학제적인 접근이 요구되며 수술 단독 치료는 불충분하고 적극적인 보조 항암 치료 및 방사선 치료가 고려되어야 한다. Sacrococcygeal teratoma (SCT) is an unusual tumor in adults. The incidence of malignant transformation of this tumor increases when its excision is delayed beyond 1 month of age. We report an uncommon case of adenocarcinoma arising within the colonic mucosa of a mature teratoma of the sacrococcyx in a 44-year-old male. The patient received surgical resection for a sacrococcygeal mass in a local hospital and was diagnosed with adenocarcinoma arising from SCT. He was referred to our hospital for further treatment and received chemotherapy as adjuvant treatment. After 4.5 years, the coccygeal mass recurred on follow-up imaging workup, and surgical resection was performed. On pathologic work-up, residual disease at the resection margin was identified microscopically. Pathologic diagnosis was a primary adenocarcinoma arising from the colonic mucosa within a mature teratoma. The patient received adjuvant-chemotherapy and radiotherapy and has been followed up. (Korean J Med 2013;85:101-105)
Jang Ho Cho(조장호),Ghee-Young Kwon(권기영),Minyong Kang(강민용),Hyun Hwan Sung(성현환),Hwang Gyun Jeon(전황균),Byong Chang Jeong(정병창),Seong Il Seo(서성일),Seong Soo Jeon(전성수),Hyun Moo Lee(이현무),Han-Yong Choi(최한용),Su Ji 대한비뇨기종양학회 2020 대한비뇨기종양학회지 Vol.18 No.3
Purpose: There remains a lot of unmet need to increase understanding of node-positive (ypN+) muscle invasive bladder cancer (MIBC) after neoadjuvant chemotherapy and radical cystectomy to decide the appropriate therapeutics. Materials and Methods: In a retrospective study using the center cancer chemotherapy registry, we found 113 MIBC patients who were treated with neoadjuvant chemotherapy involving gemcitabine and cisplatin (GP) followed by radical cystectomy between 2010 and 2014. Disease-free survival (DFS) and overall survival (OS) were compared according to the pathologic node positivity (ypN- vs. ypN+). Among a total of 165 patients with MIBC who received neoadjuvant chemotherapy involving GP, 118 underwent radical cystectomy. In 46 patients with ypN+ disease, DFS and OS were evaluated according to administration of adjuvant GP. Results: After neoadjuvant chemotherapy and radical cystectomy, 41% of patients had ypN+ disease, which showed significantly shorter DFS (median, 7.4 months; 95% confidence interval [CI], 5.3–9.6 months) and OS (median, 20.0 months; 95% CI, 13.4–26.6 months) compared to those with ypN- disease. The patients with ypN+ disease had a high risk of recurrence or death, regardless of the administration of adjuvant chemotherapy or adjuvant regimen. Conclusions: Within the limitations of this retrospective study, MIBC patients with ypN+ disease despite neoadjuvant chemotherapy and radical cystectomy had a poor prognosis. Further studies involving novel, effective adjuvant treatment including immunotherapy agents are needed to reduce the high risk of recurrence or death in these patients.
로봇 지원 원격 초음파 영상진단을 위한 마스터-슬레이브 시스템의 개발
서준호,조장호,권오원,Seo, Joonho,Cho, Jang Ho,Kwon, Ohwon 한국로봇학회 2017 로봇학회 논문지 Vol.12 No.4
In this paper, we introduce a robot-assisted medical diagnostic system that enables remote ultrasound (US) imaging to be applied to the conventional telemedicine, which has been possible only with interviewing or a visual exam. In particular, a master-slave robot system is developed that ultrasonic diagnosis specialist can control the position and orientation of US probe in the remote place. The slave robot is designed to be compact, lightweight, and hand-held so that it can easily transfer to the remote healthcare center. Moreover, 6-degree-of-freedom (DOF) probe motion is possible by the robot design based on Stewart platform. The master device is also based on a similar structure of the slave robot. To connect master and slave system in the wide area network (WAN) environment, a hardware CODEC was developed. In this paper, we introduce the detail of each component and the results of the recent experiments conducted in the remote sites by the developed robotic ultrasound imaging system.
이영호 ( Yeong-ho Lee ),윤현준 ( Hyeon-jun Yun ),손석환 ( Seok-hwan Son ),조장호 ( Jang-ho Cho ),정민철 ( Min-chul Chung ),곽원봉 ( Won-bong Kwak ),정성훈 ( Sung-hun Jung ),안호근 ( Ho-geun Ahn ) 한국환경기술학회 2016 한국환경기술학회지 Vol.17 No.1
합성고무 및 합성수지는 우수한 화학적, 물리적 성질로 인해 다양한 분야에서 널리 활용되고 있으며, 제조과정 중 산화방지제가 사용되고 있다. 대표적인 산화방지제는 페놀계의 styrenated phenols(SPs)이며, 산화방지제 외에 계면활성제의 소수성 그룹으로도 사용된다. 이러한 SPs의 합성에 균일계 산촉매를 사용하게 되면 장치의 부식, 염 부산물의 생성 및 생성물 분리와 같은 문제점을 가지게 된다. 따라서 본 연구에서는 고체산 촉매, SO<sub>4</sub><sup>2-</sup>/TiO<sub>2</sub>를 함침법으로 제조한 다음, SPs 혼합물을 합성하고, distyrenated phenol(DSP)의 함량이 높은 SPs 혼합물을 제조할 수 있는 반응조건을 검토하였다. SO<sub>4</sub><sup>2-</sup>/TiO<sub>2</sub> 촉매의 SO<sub>4</sub><sup>2-</sup>이온은 1M-H<sub>2</sub>SO<sub>4</sub> 수용액에 담체를 넣고 교반함으로써 담지한 다음, 110℃에서 12시간 건조, 600℃에서 2시간 소성하여 SO<sub>4</sub><sup>2-</sup>/TiO<sub>2</sub>촉매를 제조하였다. 촉매의 물성은 BET, SEM, XRD 및 FT-IR 분석을 통하여 조사하였고, 제조한 촉매의 활성은 통상적인 액상회분식반응기를 이용하였다. 반응물 및 생성물의 조성은 가스크로마토그래프를 이용하여 분석하였다. 담체인 TiO<sub>2</sub>를 황산 수용액으로 처리하면, 비표면적은 황산 담지량이 증가할수록 증가하는 경향을 보이며, 표면이 거칠어진 것을 볼 수 있었다. 결정구조는 황산 수용액으로 처리하여도 변화가 없음을 알았다. 그리고 FT-IR 스펙트럼에서 S=O 및 S-O결합에 해당하는 흡수피크가 1048 cm<sup>-1</sup>와 1135 cm<sup>-1</sup>에서 나타났기 때문에, 담체 TiO<sub>2</sub>에 SO<sub>4</sub><sup>2-</sup>이 첨착되어 있음을 알았다. DSP의 선택율은 반응물 대비 촉매량이 5wt%까지 증가 후 감소하였으며, 반응온도의 경우 100℃까지 증가 후 감소하였다. 또한, 반응시간과 황산 수용액의 처리농도가 증가할수록 DSP의 선택율은 감소하였다. 반응물 대비 촉매량 5wt%, 반응온도 100℃, 황산 수용액의 처리농도가 담체 대비 10wt%, 반응시간 1시간 일 때, 페놀과 스티렌의 전화율은 모두 거의 100%이였으며, 동일조건에서 MSP, DSP 그리고 TSP의 선택율은 각각 16.7%, 66.1% 그리고 17.1%이었다. It is widely used due to the physical property in not only industrial but also the daily life. In order to manufacture this synthetic rubber and resin it is general that the additive are used with various kind. The antioxidant is used among the additive as the additive for enhancing the oxidative stability of the raw material. Among the antioxidant, phenolic antioxidant, such as styrenated phenols (SPs). Homogeneous catalyst is used in the currents SPs synthesis. However, liquid-catalyst generates by-product salt and apparatus corrosion. Therefore, the styrenated phenols from phenol and styrene were synthesized over environmentally friendly SO<sub>4</sub><sup>2-</sup>/TiO<sub>2</sub> catalyst. The SO<sub>4</sub><sup>2-</sup>/TiO<sub>2</sub> catalyst was prepared by impregnating TiO2 powder into an aqueous 1M-H<sub>2</sub>SO<sub>4</sub> solution. After SO<sub>4</sub><sup>2-</sup>/TiO<sub>2</sub> catalyst was dried for 12 hours at 110℃ and calcined for 2 hours at 600℃. The catalysts were characterized by BET surface area, SEM images, X-ray diffraction patterns, and FT-IR spectra. The BET surface area was increased as increasing amounts of sulfuric acid impregnated. SEM images were seen in a rough surface. X-ray diffraction patterns did not change. FT-IR absorption peak for S-O and S=O bonds on the catalyst appeared at 1048 cm<sup>-1</sup> and 1135 cm<sup>-1</sup>, respectively. The contents of SO<sub>4</sub><sup>2-</sup> in the catalyst were varied in range of 0.5~20wt%. Catalytic activity was investigated by an alkylation of phenol with styrene in a batch liquid-phase reactor. DSP is decreased after the amount of catalyst increased to 5wt%. And the reaction temperature is decreased after increased to 100℃. DSP selectivity decreased. As the reaction time increases and the sulfuric acid loadings. Conversions of phenol and styrene showed almost 100% over the 10wt%-SO<sub>4</sub><sup>2-</sup>/ TiO<sub>2</sub> catalyst at reaction temperature of 100℃. At same reaction conditions, selectivity of MSP, DSP, and TSP were 16.7%, 66.1%, and 17.1%, respectively.
원격 중재시술용 마스터장치에 대한 의료진 요구분석 및 이를 반영한 메커니즘 설계
우현수(Hyun Soo Woo),조장호(Jang Ho Cho),이혁진(Hyuk Jin Lee) 제어로봇시스템학회 2016 제어·로봇·시스템학회 논문지 Vol.22 No.8
This paper presents an optimally designed master device mechanism for teleoperated interventional robotic system. The interventional procedures using the teleoperated robotic system and the physicians’ requirements are summarized. The master device should implement 5-DOF motion including 2-DOF translational motion for the entry position control, 2-DOF rotational motion for the orientation control, and 1- DOF translational motion for needle insertion. The handle assembly includes a 1-DOF translational mechanism for needle insertion and buttons for operation mode selection. The mechanisms for the 2-DOF translational motion and the 2-DOF rotational motion are designed using motors and brakes based on the various mechanisms to satisfy all the above requirements, respectively. Absolute position sensors are adopted to implement automatic initial positioning and orientation matching at the first step of needle insertion.