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      • 반복 용체화처리에 의해 조직제어된 Ti-6Al-4V 합금의 인장성질

        조형준,임영호,이준희 동아대학교 공과대학 부설 한국자원개발연구소 1994 硏究報告 Vol.18 No.2

        The purpose of the present study is to improve the tensile properties of the beta-quenched with little strain due to processing, only by heat treatment. Control of volume fraction, morphology and distribution of alpha is of great importance in achieving desired mechanical properties with a good combination of strength and elongation. Accordingly, a cyclic solution treatment has been proposed to obtain bimodal structures of equiaxed and acicular alphas. The microstructures of the specimens subjected to the Cyclic Ⅲ solution treatment consisted of nearly equiaxed and acicular alphas with the matrix of the tempered martensite. As a result, the tensile properties became almost equivalent to the specimens of the double solution treatment in the α+β region.

      • 랫드에서 인체 재조합 적혈구 조혈인자, rHuEPO의 13주 정맥투여 아만성독성에 관한 연구

        김형식,곽승준,천선아,박현선,한하수,임소영,안미영,김원배,김병문,안병옥,홍성렬,이병무 성균관대학교 약학연구소 1998 成均藥硏論文集 Vol.10 No.1

        A recombinant human erythropoietin (rHuEPO) was administered intravenously at dosage levels of 0, 100, 500, and 2500 IU/㎏/day for a period of 13 weeks. There were no observed clinical signs and deaths related to treatment in all groups tested. Decreases in body weight gain and food consumption were observed only in males of 2,500 IU/㎏ group after 2 weeks. In hematological parameters, erythrocyte content, hematocrit values and hemoglobin concentration were dose-dependently increased in rHuEPO treated groups. The ratio between kidney weight and whole body weight was significantly increased in females of 500 and 2,500 IU/㎏ groups. The spleen weight was also increased in both sexes of 500 and 2,500 IU/㎏ groups. However, the absolute weight change of other organs was not observed. In histopathological examinations, the renal tubular basophilia was observed only in males and females of 2,500 IU/㎏ groups. From these results, it is concluded that the no-observed adverse effect level(NOAEL) of rHuEPO is 100 IU/㎏ in rats in the present study.

      • Photoresist line pattern형성의 최적 조건에 관한 연구

        梁辰承,林亨俊 明知大學校 産業技術硏究所 2003 産業技術硏究所論文集 Vol.22 No.-

        Abstract - The study reported in this paper deals with the optimal operation conditions for the formation of photoresist line pattern for the sub-layers of bare silicon, silicon dioxide and aluminum. Light sources of i-line and h-line are used and expose time and develop time are varied for each sub-layer so that the optimal condition can be obtained for the slope and depth of photoresist line which has a width under 1 ㎛.

      • KCI등재

        응집제의 주입량 및 압력변화에 따른 여과특성

        이성호,임택준,조준형 강원대학교 삼림과학연구소 2001 Journal of Forest Science Vol.17 No.-

        제지공업은 다른 공업에 비해 용수 소비량이 많고 이에 따라 폐수의 배출량도 많은 용수 다소비 산업이다. 제지폐수의 처리는 물리적, 화학적, 처리로 1차 처리를 하고 생물학적 처리로 2차 처리를 한 후, 필요에 따라 고도처리를 행하여 재이용 하거나 방류하는 시스템으로 구성되어 있다. 물리적 처리 중 응집침전법에 의한 처리방법은 생물학적 처리의 전 단계로서 처리가 불량할 경우 생물학적 처리 시스템의 부하량이 높아져 처리율의 저하를 유발한다. 또한 가장 비용이 적게 드는 처리방법이므로 응집침전에서 많은 오염물을 제거하는 것이 비용 면에서도 유리하다고 할 수 있다. 제지공장의 폐수에는 Fiber, Filler, 그 밖의 유기용매가 포함되어 있으며, 폐수량이 많기 때문에 그 만큼의 설비자본과 운영비가 소요된다. 그러므로 폐수의 양을 줄이고 그 안에 함유된 여러 가지 물질들을 적은 비용으로 효율적으로 제거하는 방법이 필요하게 된다. 본 실험은 제지폐수를 보다 효율적으로 여과하는 방법을 찾고자 함에 있어 가압 여과시험을 채택하여 응집제의 종류 및 첨가량 그리고 압력의 변화를 주면서 여과의 특성 실험을 하였다. 폐수내의 섬유나 Filler 등은 미세하게 분산되어 콜로이드성 물질이 되는데 이것은 여과시에 여재 위에 쌓여 여과 조작을 방해한다. 여기에 응집제를 첨가하게 되면 분산된 콜로이드 입자를 응집제가 표면에 사슬처럼 붙어 안정화시킨다. 즉, 침전성과 여과성이 향상되고 SS가 떨어진다. 본실험에 사용된 응집제는 FeCl3, Alum, CaCl2, Polymer 이며, 네 가지 응집제를 0.01g, 0.03g, 0.05g 씩 첨가(폐수 100mL에 대해)하고 압력을 49, 98, 147, 196 kPa로 변화시키면서 실험을 하였다. 이와 같은 여러 변화의 실험을 통하여 각 단위 시간 별로 여과되는 여액량을 측정하여 여과 속도 및 탁도 등을 측정하였다. Compared to other industries, pulp and paper industry use a lot of water. As a result, a large amount of the waste water is discharged in the pulp and paper industry. This study was investigated to prevent the environmental pollution terribly faced with our society nowadays. In the waste water of pulp and paper there are so many things in the waste water, like fiber, filler, and other organic solvent etc. so we must remove them from our environment. This study was investigated to experiment on test of impressed filtration with the kind and quantity of coagulant and the variance of pressure. In this study, we used feds, alums, CaCl2, polymer as a coagulant and these pressure was 49, 98, 147, 196kpa. According to this study, we measured the speed of filtration and turbidity, measuring filtrated water. According to the values, we know the fact that as the consistency of coagulant and pressure were high, the filtration was good.Key words : Coagulant, wastewater, filtration, turbidity

      • 후복막강경 근치적 신적출술 : 개복 근치적 신적출술과의 비교

        김경영,임동훈,문형윤,노준,김철성 朝鮮大學校 附設 醫學硏究所 2009 The Medical Journal of Chosun University Vol.33 No.S

        Purpose: Although kidney is located in the retroperitoneal space laparoscopic radical nephrectomy is usually performed by the transperitoneal approach. At our institution the retroperitoneal approach is preferred. We evaluated the surgical outcomes, safety, oncologic outcomes, and compared with the results those of open radical nephrectomy in a contemporary cohort. Materials and Methods: Between January 2000 and December 2005 we performed retroperitoneal laparoscopic radical nephrectomy for renal cell carcinoma in 37 patients with clinical stage cT1 and cT2. Data from the these patients were retrospectively compaired with 30 contemporary cases treated with open radical nephrectomy. The clinical parameters including perioperative outcomes, complications, pathologic data, learning curve and recurrence were evaluated. Results: For the 37 retroperitoneal radical nephrectomies mean tumor size was 4.6cm (range 2.3 to 8.0), surgical time was 203.6min (range 110-410) and blood loss was 241.8cc. Mean specimen size was 10.4cm (8.7-14.4). Mean analgesic used day was 1.3 (0-4) and mean postoperative hospital stay was 4.2 days. minor complications occur in 16 cases and no major complications occurred. Surgical margins were negative for tumor in all patients. Variable parameters were comparable between patients undergoing laparoscopic and open radical nephrectomy. However, laparoscopy resulted in decreased blood loss, surgical times, analgesia use, time to oral intake, time to drain removal and postoperative hospital stay. No different complication rate is between two groups Conclusions: Retroperitoneal laparoscopic radical nephrectomy can be a safe and effective treatment in renal cell carcinoma. Although no long-term follow-up is available, our follow up to mean 31 months confirm the effectiveness of retroperitoneal laparoscopic radical nephrectomy in terms of surgical principles and oncological effectiveness.

      • Photolithography 공정을 이용한 resonator 제작에 관한 연구

        梁辰承,朴亨俊 明知大學校 産業技術硏究所 2003 産業技術硏究所論文集 Vol.22 No.-

        Abstract - A series of stress-free silicon nitride resonator for nano-electromechanical system device and wireless telecommunication applications are microfabricated. The fundamental resonance frequency of doubly clamped beam can be calculated from the mechanical properties and the geometry of the resonator. Fundamental frequencies of the resonator made in this study are ranged 1.0 to 420㎒

      • 다발성 대장암 간전이 환자의 간절제를 위한 새로운 시도

        주종우,김형철,임철완,신응진,조규석,유기원,송옥평,홍대식,박성진,조준희,이혜경,김희경,권계원,고은석 순천향의학연구소;Soonchunhyang Medical Research Institute 2004 Journal of Soonchunhyang Medical Science Vol.10 No.2

        Multiple bilobar liver matastases (MBLM) are the main cause of low resectability in the colon cancer liver metastases. The authors experienced one case of initially non-resectable colon cancer liver metastases. He was curatively and safely treated with a two-stage hepatectomy using the new method of future remnant liver volume growing. A 54-year-old man was referred to our department with the sigmoid colon cancer combined with MBLM, which were checked in two small metastatic lesions in the left lobe and five large sized lesions in the right lobe in the computed tomogram (CT). A laparoscopic assisted anterior resection was primarily performed. We performed the 1^(st) stage hepatectomy 3 weeks after the colon resection. Intra-operative Ultrasonogram (US) found 9 small superficial metastatic lesions in the left lobe. All that lesions were completely removed by non-anatomical wedge resection. An occlusion ballon catheter was placed in the right portal vein through a small branch of the inferior mesenteric vein at that time. The future remnant liver volume was sufficiently increased 3 weeks after the 1^(st) hepatectomy. A right hepatectomy was safely performed 22 days after the 1^(st) hepatectomy. The patient received a regional chemotherapy (interleukin2 based immuno-chemotherapy through hepatic artery) for 4 months, then received 9 cycles of systemic chemotherapy (biweekly Oxaliplation, leucovorin, plus 5-fluorouracil) without any recurrence evidence.

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