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Computer Simulation에 의한 FMS의 生産日程 計劃 硏究
최효돈,남현우,문기주,하정진 동아대학교 공과대학 부설 한국자원개발연구소 1992 硏究報告 Vol.16 No.1
An FMS(Flexible Manufacturing System) consists of a group of computer numerically controlled machines linked by and automated material handling system, and which operates under computer control. FMS's are designed for production of small and medium-sized batchs comprising several different part types with the efficiency of automated mass production and the flexiblity of the job shop. In this research, job scheduling for minimizing APT(average processing time) was studied in FMS with 3 machining centers which are served by a cyclic-unidirectional conveyor while the conveyor speed is set to 1, 2, or 3, respectively. The results of this research could be useful to reduce APT in part manufacturing systems in practice.
鄭玩鎬,崔燉喜 한국교원대학교 과학교육연구소 1993 청람과학교육연구논총 Vol.3 No.1
Rapid development of modern biology increasingly new terminology with diversification. We must realize the fact that misuse, mistranslation, inconsistency and irrelativity of terminology brings about serious problem on education base. An analysis of the biology textbook for primary, secondary school indicates findings, as follows: 1. There are 178 kinds of biological terms (2.36%) (total 7,537 kinds) used same meaning but difference expression. 2. There are 103 kinds of biological terms (1.37%) used more than two kinds same textbooks simultaneously. 3. There are 26 kinds of biological terms (0.34%) used difference foreign expression but same meaning. 4. There are 327 kinds of biological terms (4.3%) used relationship between primary, middle, high school. 5. There are 47 kinds of biological terms (0.62%) used ununified rule even if editing official parts. For the purpose of clarify the problem and suggest solution of this study there has been performed to look into the standization of biological terms used in the biology textbooks of primary and secondary school.
다발성 골수종에서 저용량 thalidomide, cyclophosphamide, dexamethasone (TCD) 요법의 효과
류충헌,정재현,고정해,장제혁,박영진,최규남,박봉수,이상민,주영돈 인제대학교 2008 仁濟醫學 Vol.29 No.-
Background and Objectives : The immunomodulatory drug thalidomide can inhibit angiogenesis and induce apoptosis in experimental models. It can also induce marked and durable response in newly diagnosed myeloma patients. Thalidomide has been used at doses ranging from 200 to 800 mg with significant toxicity. No data are available on the impact of low-dose thalidomide, cyclophosphamide and dexamethasone as initial therapy for myeloma patients. Design and Methods : To address this issue, newly diagnosed myeloma patients were treated with 50 mg/day thalidomide continuously and cyclophosphamide 150 mg/m², days 1-4 and dexamethasone 20 mg/m², days 1-5 and day 15-19, every month. Between October 2005 and October 2006, 14 patients (median age 54.5 years) were treated with low-dose thalidomide, cyclophosphamide and dexamethasone. Results : After a minimum of two cycles of treatment, 5 patients (55.5%) showed a partial remission. After four cycles of treatment, 10 patients (83.3%) showed a partial remission (n=6) and complete remission (n=4). After a median follow-up of 15.4 months, 1 year overall survival rate was 82.0%. Thalidomide was well tolerated without serious toxic effects. Conclusions : The combination of low-dose thalidomide, cyclophosphamide and dexamethasone demonstrates favorable response rate and 1 year overall survival rate in newly diagnosed myeloma. Severe toxicities were not seen with this combination.
이기우,최충돈,조재욱,김충실 한국식품유통학회 2004 食品流通硏究 Vol.21 No.3
This study was carried out to give reference data for peach producers who will be to determine an intention whether or not to select by brix degree and to sell by small package(about 2 kilograms). We developed 2 kilograms?package box. and selled peach indicated in brix degree, then analyzed the effect and consumers'preference degree for the sale. It was confirmed that peach package standard with indicating brix degree by consumers' preference was 2kg as the result of this study. 65% of consumers were satisfied 2kg package box. 18% of them replied to like a little more large size. and 16% of them wanted a little more small size. We expect that there will be the effect of sale by indicating brix degree in the case of 'Vlibaekdo' in the brix degree higher than 13?x being produced in large quantities. We think that it will be desirable for packing house over a village unit not a farm to select and sale by brix degree becase of a farmer meeting more fixed cost than packing house.
카드뮴 첨가된 α형 산화철에 의한 일산화탄소의 촉매산화 반응연구
이성한,김용록,김돈,정원양,김규홍,최재시 연세대학교 자연과학연구소 1983 學術論文集 Vol.11 No.-
α형 산화철에 카드뮴을 4mol%, 8mol% 및 12mol%로 각각 첨가시켜 외성영역의 특성을 갖는 산화물들을 제조하였다. 이 산화물들을 촉매로한 일산화탄소의 산화반응 속도론적 연구를 통하여 본산화물의 결함구조, CO 산화반응에 대한 촉매성 및 불순물 첨가효과등을 조사하였다. 또한 450℃에서 O_2 및 CO를 여러압력으로 도입시켜 Cd-doped α-Fe_2O_3의 전기전도도를 측정하고 이를 반응속도론적 데이타와 결부시켜 본산화물상에서 CO 의 산화반응 메카니즘과 율속단계를 제안하였다. 반응온도범위 350~460℃에서 산출된 활성화에너지는 10.1~11.3kcal.mol^-1이었다. CO_2흡착에 의한 CO산화반응의 억제효과는 본실험의 반응온도 영역인 350~460℃에서는 나타나지 않았으며 CO 산화반응의 전반응속도 차수는 1.5차로서 일산화탄소에 대해서는 1차, 산소에 대해서는 0.5차임이 밝혀졌다. 반응속도론적 데이타와 전기전도도 데이타에 의해 본촉매의 활성은 카드뮴도프로 인해 생성된 산소공위(Vo"-2e^-)에 기인한 것이었다. 카드뮴의 첨가량이 증가할수록 반응속도는 증가하였으나 12mol% 이상의 카드뮴이 첨가된 산화철상에서는 반응속도가 크게 증가하지 않는 것으로 나타났다. CO와 O_2는 근본적으로 화학흡착하며 CO의 흡착자리는 격자산소(O^-2_(latt))와 기흡착원산소 (O^-_(ads)), 그리고 O_2의 흡착자리는 산소공위(Vo"-2e^-)로 밝혀졌다. The α-Ferric oxide containing 4, 8, and 12mol% with cadmium were prepared. The oxidation rates of carbon monoxide in the presence of these oxide systems were measured to investigate the defect structure, the catalytic activity for the oxidation of carbon monoxide, and the impurity effect. The conductivity was also measured at 450℃ under the various pressures of oxygen and carbon monoxide. From the agreement between the kinetic and conductivity data, the oxidation mechanism of carbon monoxide and the rate determining step on this oxide catalyst were suggested. In the temperature range from 350 to 460℃, the calculated activation energy for the CO oxidation over Cd-doped α-Fe_2O_3 systems were 10.1∼11.3kcal·mol^-1. The inhibition by an adsorbed CO_2 during the CO oxidation was not observed in the above temperature range. The overall reaction order for the CO oxidation is 1.5; the first order with respect to CO and the one-half order with respect to O_2. The catalytic activity of this oxide system is due to oxygen vacancies induced by Cd-doping. The oxidation rates increase with increasing the amount of dopant and above 12mol%, however, don't highly increased. CO and O_2 are essentially chemisorbed as ions and the adsorption sites for CO are the lattice oxygens (O^2-_(latt)) and prechemisorbed oxygens (O^-_(ads)), the adsorption site for O_2 is the oxygen vacancies (Vo¨-2e^-).