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전자식 오이선별기(P/2모형)의 개발 타당성 분석 및 최대공급가격의 결정
권면철,양문희 단국대학교 신소재기술연구소 2000 신소재 Vol.9 No.-
오이선별작업은 오이품질의 상태에 따라 분류하는 작업을 희미하며 선별작업의 일차적 목적은 가격차별화에 따른 오이농가 소득의 극대화에 있다. 우리 나라의 경우 일반적으로 오이선별작업은 오이길이와 굴곡도를 작업자의 육안에만 의존하여 판정하는 작업으로 선별등급수가 증가하게 되면 선별시간은 기하급수적으로 증가하게 된다. 이러한 증가현상을 극복하기 위하여 전자식 오이선별기의 개발이 요구되나 그 개발투자 타당성에 대한 연구는 미미한 실정이다. 본고에서는 한 개의 원형컨베이어와 두 개의 오이 투입장치로 구성된 전자식 오이선별기(P/2모형)를 기준으로, 또한 수요자 입장에서의 비용/수익분석(Cost/Profit Analysis)을 통해 P/2모형의 개발투자 타당성 모형의 구축과 분석, 할인율과 운영비에 대한 투자타당서의 민감도 분석을 제시하였다. 또한 수요자 입장에서 구매하려는 P/2모형의 최대공급가격을 제시하였다. A sorting process for cucumber is the process of sorting cucumber into several boxes or bins by inspecting the quality of a cucumber, such as its length and shape. Since the current sorting methods in Korea depend entirely on the bare function of human eyes, the time to sort one cucumber increases exponentially as the number of classes increases. In order to overcome this phenomenon, an automatic sorting machine for cucumber needs to be developed. However, there has been few economic feasibility study on the research and development of this machine. In this paper, by using a conventional cost/profit analysis, we suggest an economic feasibility model on the development of the automatic sorting machine (P/2 model) with a circular bucket conveyor system and two input devices in addition to the analysis of sensitivity on the interest rate and the proportion of operating cost to the initial investment cost. Also, we suggest the possible maximum supply price of our P/2 model at which buyers would like to purchase.
Advanced Korean Industrial Safety and Health Policy with Risk Assessment
Kwon, Hyuck-Myun,Cho, Jae-Hyun,Moon, Il,Choi, Jae-Wook,Park, Doo-Yong,Lee, Young-Soon Occupational Safety and Health Research Institute 2010 Safety and health at work Vol.1 No.1
This article describes a systematic roadmap master plan for advanced industrial safety and health policy in Korea, with an emphasis on. Since Korean industries had first emergence of industrial safety and health policy in 1953, enormous efforts have been made on upgrading the relevant laws in order to reflect real situation of industrial work environment in accordance with rapid changes of Korean and global business over three decades. Nevertheless, current policy has major defects; too much techniques-based articles, diverged contents in less organization, combined enforcement and punishments and finally enforcing regulations full of commands and control. These deficiencies have make it difficult to accommodate changes of social, industrial and employment environment in customized fashion. The approach to the solution must be generic at the level of paradigm-shift rather than local modifications and enhancement. The basic idea is to establish a new system integrated with a risk assessment scheme, which encourages employers to apply to their work environment under comprehensive responsibility. The risk assessment scheme is designed to enable to inspect employers' compliances afterwards. A project comprises four yearly phases based on applying zones; initially designating and operating a specified risk zone, gradually expanding the special zones during a period of 3 years (2010-2012) and the final zone expanded to entire nation. In each phase, the intermediate version of the system is updated through a process of precise and unbiased validation in terms of its operability, feasibility and sustainability with building relevant infrastructures as needed.
Kwon, Hae-Myun,Kim, Yong-Seong Korean Chemical Society 2009 Bulletin of the Korean Chemical Society Vol.30 No.2
We have developed the yttrium oxide (YNP) or ytterbium oxide (YbNP) nanoparticle/polymer matrices for the size-dependent separation of DNA ranging from 100 bp to 9,000 bp. High separation efficiency (> $10^6$ plates/m) and the baseline resolution for various DNA standards (100 bp, 500 bp, and 1 kbp DNA ladder) were obtained in 10 min with these matrices. The effects of concentrations of both polyethylene oxide (PEO) and nanoparticles were investigated and the highest performance was obtained at 0.02% PEO with 0.02% YNP or YbNP. Similar sieving power for both YNP and YbNP matrices was observed probably due to the similar sizes of nanoparticles, resulting in the formation of comparable sieving networks for DNA separation. For the reduction of electrosmotic flow, either dynamic or permanent coating of the capillary inner wall was compared and it turned out that PEO was superior to polyvinylpyrrolidone (PVP) or polyacrylamide (PAA) for better separation efficiency.
Jae Myun Ryu,Im Kwon Seo,Tae Myoung Kim,Yun-Bae Kim,Sung Kwon Moon,Kyung-Hwan Jung,Keerang Park,Seung Bok Hong,Seock-Yeon Hwang 한국실험동물학회 2008 Laboratory Animal Research Vol.24 No.2
The chemopreventive effects of Magnolia ovobata water extract (MWE) and 70% ethanol extract (MEE) on the development of colonic aberrant crypt foci (ACF) induced by 1,2-dimethylhydrazine (DMH) were investigated. Six-week-old male F344 rats were divided to 7 experimental groups; 1) DMH alone, 2) DMH+0.3% MWE, 3) DMH+1% MWE, 4) DMH+3% MWE, 5) DMH+1% MEE, 6) 3% MWE alone and 7) normal control. Animals were subcutaneously injected with DMH (30 mg/kg) 4 times to induce colonic ACF during the initial 2 weeks, and fed with a basal containing various concentrations of test materials (MWE or MEE) for 8 weeks including the DMH-treatment period. The formation of ACF on colonic mucosa was observed after staining with methylene blue. There are no specific effects of MWE and MEE on body weight, feed and water consumptions, organ weights, histopathological observations, and hematological and blood chemistry analyses. Challenge with DMH alone induced mean number of 270.1 ACF/colon which was somewhat inhibited by MWE treatment, showing average numbers of 234.3-242.1 ACF/colon. In comparison, the ACF number was significantly suppressed to 216.5 by administration of 1% MEE. Therefore, these results suggest that Magnolia ovobata extracts, especially MEE, exert a chemopreventive effect on the DMH-induced colon cancer by inhibiting the early development of ACF.