• 시스템엔지니어링학술지
• /
• 제10권1호
• /
• pp.33-41
• /
• 2014

New design concept of Reactor Coolant System (RCS) including a reactor assembly for the SMR is introduced in this work. An exploration of new type of reactor that is advanced from proposed SMRs is performed by using systems engineering approach. In this point of view project structured on three main phases; needs analysis (NA), concept exploration (CE), and concept definition (CD). Main objectives as an output of the CE stage are a small size, low cost, shortening the schedule, and enhancing safety. The SMRs usually have a small size requirement. In order to meet the size requirement and to achieve a productivity, in other words, easiness to manufacture, this paper suggests an integrated PWR design concept through researching predecessors. Although the integrated PWR concept provides many advantages, it has disadvantages that composite of maintenance and a low availability problem. Therefore, this paper comes up with a run-to-fail design concept based on modular design to address the maintenance problem and to maximize the availability of SMRs as well as to be compatible with the overall-SMRs including Barge Mounted(BM)type.

• 대한안전경영과학회:학술대회논문집
• /
• 대한안전경영과학회 2009년도 춘계학술대회
• /
• pp.295-304
• /
• 2009

오늘날 중소기업의 자동화 및 정보화 설비구축을 보면 과거보다는 높은 발전을 이루고 있다. 그러나 이러한 독립된 설비, 장비, 시스템의 기능을 살려 관리와 경영의 효율을 높이기 위해서는 인력과 비용이 많이 소요되어 운영계획을 포기하거나, 규모를 축소하여 생산성향상에 저해되는 상황이 발생하기도 한다. 따라서 본 연구에서는 최근에 반도체 기술의 발전으로 임베디드 마이크로프로세서의 개발로 보다 용이하고, 빠르게 시스템을 설계하거나 변경을 할 수 있도록 하드웨어와 소프트웨어의 인터페이스를 구현하였다. 특히, 중소형 제조기업에서 실시간으로 생산정보를 통해 경영에서 필요로 하는 정보를 생성하는 프로세스를 제시하였다.

• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 1991년도 한국자동제어학술회의논문집(국내학술편); KOEX, Seoul; 22-24 Oct. 1991
• /
• pp.917-921
• /
• 1991

Hydraulic fitting impulse tester is equipment which produce impulse pressure waveform that specified foreign standard of SAE, JIS etc. Test conditions of SAE J1453 about waveform standard indicates frequency of 35-70 cycle/min, pressure of 560 bar, oil temperature of 93 .+-.3.deg. C etc. and required cycle is a million over. In additions, Test condition operated continuously equipment. This development item adopted new pattern method such as intensifier and rotary distributor is different from already established fitting impulse tester applied servo valve and high pressure direct directional control valve. Therefore, this development item which compares already established item is good reliability, low cost of manufacture and save of electric energy. especially, Domestic small and medium enterprise uses this tester because of economical cause. We develope appropriateness tester which conforms to demand of user.

• 한국IT서비스학회:학술대회논문집
• /
• 한국IT서비스학회 2003년도 춘계학술대회
• /
• pp.411-419
• /
• 2003

ERP 도입 및 운영과정에 전사적 자원 즉 인적자원과 물적자원이 투입되고 활용되었다. 기업경영에 있어서 제 자원의 관리가 중요하고, 특히 인적자원이 성과에 중요한 영향을 미치고 있다. 그 동안 ERP 도입요인과 도입성과에 대한 기존의 연구는 중소기업을 포함한 전체 기업을 대상으로 한 연구가 대부분이었으며, 그러한 연구의 대부분은 먼저 ERP을 도입한 대기업 위주의 연구였다고 볼 수 있다. 중소제조기업의 ERP 도입요인으로서 열악한 전사적 자원의 수준이 ERP 도입성과 즉 생산효율성에 영향을 미친다는 전제하에 이들 간의 인과관계를 위한 연구모형을 제시하였다.

• 대한안전경영과학회:학술대회논문집
• /
• 대한안전경영과학회 2004년도 추계학술대회
• /
• pp.47-51
• /
• 2004

Facility layout for enterprise's competitive power strengthening and construction of offensive manufacture line and direction presentation for design of production management system that is new by operation improvement according to S company. In enterprise in JIT(Just in Time) system of leading persons affecting in productions among a lot of habitat factor analyze. It is that through equipment Layout among those factors enterprise my problem improve and serves enterprise's absolute ability cultivation. Even if it is JIT production main point that affect to apply the modular production to productive system among at equipment Layout, lot size, bottleneck session etc. worker's multi-function anger, change of demand factor and productive capacity add. 'S' Through enterprise's example, I wish to establish Korean medium and small enterprises' manufacturing industry style equipment Layout model by taken place effect interpretation.

• Journal of Biosystems Engineering
• /
• 제36권6호
• /
• pp.416-421
• /
• 2011

This study was initiated to prevent rear-end collision which causes the most frequent human damage by agricultural tractors. Therefore, this study was aimed to evaluate the luminous performance of a stop lamp for an agricultural tractor which could reduce rear-end collision. The performance test of luminous intensity distribution was conducted for a total of 12 tractor models classified by size (above 44 kW for large, 30~43 kW for medium, and below 29 kW for small) and production area (domestic, foreign manufacture) in accordance with Regulation No.7 of UNECE Vehicle Regulations-1958 Agreement considering ${\pm}$20 standard deviation. Three out of 5 large, 3 out of 4 medium, and all small tractors were resulted as inadequate for the test criterion. This study found that the luminous performance results were better as the size of agricultural tractors became bigger. One out of 4 foreign and 2 out of 8 domestic manufacturers were suitable for the test criterion, and overall no difference from the luminosity test results was observed between domestic and foreign manufacturers. In addition, the measuring points, HV, 5L, 5R, 5U and 5D with the minimal luminosity revealed flaws (80% of the proportion of faulty products). Therefore, it is urgent to improve the quality for measuring points (HV, 5U, 5L, 5R, 5D) of stop lamps to apply Regulation No. 7.

• 대한안전경영과학회지
• /
• 제16권4호
• /
• pp.451-459
• /
• 2014

To solve the serious problem of insufficient manpower in medium and small scaled companies, our country allows introduction of foreign manpower for 5 business types such as manufacture industry, service industry, etc. and there are 226,825 people who entered by employment license system(E-9) in Sep. 2013. However, according to the results of investigation "actual status and difficulties of foreign manpower's employment of medium and small scaled manufacturing companies" of KFTA in 2013, 36.4% of respondents responded that current scale of introducing foreign manpower is insufficient to solve difficulties of insufficient manpower in industrial world and 37.7% of them responded that the quarter of new employment is insufficient. So, they hope that current quarter system of foreign manpower can be abolished. Meanwhile, introduction scale of foreign manpower was decided by 53,000 people so as to solve enterprise difficulties in manpower and vitalize economics this year, but illegal aliens are 39,623, more than 17.5%, in Sep. 2013 after employment expiration. Therefore, it becomes serious social problem. Government displays various support businesses so that foreign workers after employment expiration can return to their homeland legally. This thesis intends to find measures to maintain royalty for our country and support their smooth resettlement through the analysis on homecoming support business of foreign workers.

• 토지주택연구
• /
• 제2권4호
• /
• pp.559-568
• /
• 2011

이 연구는 입지계층 분석을 활용하여 특정 산업단지에 유치 가능한 업종을 도출하는 과정을 제시하고자 한다. 입지계층분석은 경제활동별 입지분포 특성을 도시인구의 순위규모 분포산식을 원용하여 경제활동의 입지변화 추세를 파악하는 것이다. 입지계층분석의 결과를 바탕으로 입지계층의 유형을 구분하고 유형별로 유치가 적절한 지역을 소개한다. 분석의 공간단위는 기초지방자치단체(시 군)를 사용하고, 분석의 업종단위는 산업 중분류에 따른다. 분석에 활용된 업종별 입지분포는 1990년부터 최근까지로, 분석대상은 광업 제조업통계조사의 종사자수 통계자료이다. 입지계층분석의 결과를 바탕으로 지역특성에 적합한 산업단지 유치업종을 결정하는 방법을 소개한다. 성장형 추세를 보이는 업종은 전자부품 영상음향 통신장비제조업, 의료 정밀 광학기기 및 시계제조업, 자동차제조업이다. 이런 업종은 적절한 관련 기반시설만 주어진다면 대부분의 지역에서 유치가 가능한 업종이다. 쇠퇴형 입지계층 업종은 담배제조업, 비금속광물제품 제조업, 의복 악세서리 모피제조업, 목제 및 나무제품 제조업 등이다. 그러나 성장형이냐 쇠퇴형이냐는 지역의 특성에 따라 다르며 시간이 지나면서 그 경향이 달라진다. 분산형 입지계층의 업종은 식료품제조업, 화학제품제조업, 비금속광품제조업, 금속가공제조업, 전자부품 영상 통신장비제조업, 석유제품제조업이다. 이런 특성의 업종은 적절한 관련 기반시설의 제공 없이도 비숙련 노동력의 제공이 가능한 지역이라면 유치가 가능한 업종이다. 재집중형 입지계층으로 간주되는 업종은 섬유제품제조업, 의복제조업, 기타 운송장비 제조업이다. 전반적으로 이런 업종은 기존 집적지를 중심을 선호하는 특성을 보이며 주로 대도시 재집중형 경향을 보이고 있으므로 중소도시나 낙후지역에서는 정책적 유인책을 제시하더라도 비효율적이며 유치가능성이 낮은 업종이다. 이러한 입지계층의 특성을 반영하여 유치 업종을 선별하고 산업단지의 개발계획을 수립할 경우, 사업용지 공급정책의 효율성과 효과성을 높일 수 있다.

• 한국정밀공학회지
• /
• 제20권7호
• /
• pp.233-240
• /
• 2003

Recently, the world are preparing for new revolution, called as If (Information Technology), NT (Nano-Technology), and BT (Bio-Technology). NT can be applied to various fields such as semiconductor-micro technology. Ultra precision processing is required for NT in the field of mechanical engineering. Recently, together with radical advancement of electronic and photonics industry, necessity of ultra precision processing is on the increase for the manufacture of various kernel parts. Therefore, in this paper, stability of ultra precision cutting unit is investigated, this unit is the kernel unit in ultra precision processing machine. According to alteration of shape and material about hinge, stability investigation is performed. In this paper, hinge shapes of micro stage in UPCU(Ultra Precision Cutting Unit) are designed as two types, where, hinge shapes are composed of round and rectangularity. Elasticity and strength are analyzed about micro stage, according to hinge shapes, by FE analysis. Micro stage in ultra precision processing machine has to keep hinge shape under cutting condition with 3-component force (cutting component, axial component, radial component) and to reduce modification against cutting force. Then we investigated its elasticity and its strength against these conditions. Material of micro stage is generally used to duralumin with small thermal deformation. But, stability of micro stage is investigated, according to elasticity and strength due to various materials, by FE analysis. Where, Used materials are composed of aluminum of low strength and cooper of medium strength and spring steel of high strength. Through this stability investigation, trial and error is reduced in design and manufacture, at the same time, we are accumulated foundation data for unit control.

• 한국직업건강간호학회지
• /
• 제12권1호
• /
• pp.5-18
• /
• 2003

The purpose of this study was to survey working conditions of women workers. We conducted a field survey of 504 manufacturing company with many women working from May 13 to June 29, 2002. We focused on only 3 categories of metal, textile and electronics industry. The result were as follows : 1. Subjects were constituted metal 27.0%, textile 37.9% and electronics industry 35.1%. Size distribution was small scale(<50 workers) 38.1%, medium(50-299 workers) 50.2% and large(${\geq}300$ workers) company 11.7%. Women workers' proportion was 43.6% of total workers, 63.8% of total contractors. 2. A medical examination enforcement of contractors workers was very poor in comparison with that of employees(p<0.001). 3. A 53.8% of total companies have conducted shiftwork system and 2-crew 2-shift(12 hours shift system) ranked first, 56.1%(151 companies). 4. Only 61.3% of total companies conducted more than 90 days as legal standard of a maternity leave and only 2.6% of total companies had a day nursery. In conclusion, many strategies for women workers are needed by companies and government. For example, the raising of understanding about maternity protection, social support insurancing of woman worker and occupational health system improvement for contractors and small size companies.