• 대한산업공학회지
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• 제41권6호
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• pp.579-587
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• 2015

Semiconductor manufacturing industry is a high density integration industry because it generates a vest number of data that takes about 300~400 processes that is supervised by numerous production parameters. It is asked of engineers to understand the correlation between different stages of the manufacturing process which is crucial in reducing production costs. With complex manufacturing processes, and defect processing time being the main cause. In the past, it was possible to grasp the corelation among manufacturing process stages through the engineer's domain knowledge. However, It is impossible to understand the corelation among manufacturing processes nowadays due to high density integration in current semiconductor manufacturing. in this paper we propose a canonical correlation analysis (CCA) using both wafer test voltage variables and fail bit counts variables. using the method we suggested, we can increase the semiconductor yield which is the result of the package test.

• 대한안전경영과학회지
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• 제5권4호
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• pp.97-106
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• 2003

At present, tendency of ERP(Enterprise Resource Planning) enterprises is that many ERP enterprises from abroad are rushing into capture of small and medium enterprises at home actively. SAP Korea and Korean Oracle have already showed their new product targeting domestic market of small or medium standing enterprise, and more, even MS(Micro Soft) also rushes into this market in earnest. The domestic business circle of ERP should prepare countermeasure by raising the perfection of product and having good command of minute marketing strategy to survive from aggressive strategy of SMB market. In addition, about the computerization of main affairs of business, ordering developing process was general that developing staffs analysed the affairs of each department that needed computerization and construct according to the operation process by using different tools, but condition is changing that businesses themselves are purchasing business application package from expert soft program enterprise and construct. Therefore, in this study, I try to grasp the problem of management, and define a new process that can help for more efficient management by making it an object producing and management module of enterprise 'K' that is one of domestic small and medium enterprise and that is operating ERP at present. As well, through the analysis of affair related producing, we are aiming to prepare for establishment of target, its range, and making the standard of result evaluation.

• Journal of Microbiology and Biotechnology
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• 제16권9호
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• pp.1331-1337
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• 2006

A mathematical model has been proposed for the batch culture of Agaricus blazei with mixed carbon sources of glucose and dextrin. In the proposed model, the metabolism of A. blazei was divided into three parts: cell growth, exopolysaccharides (EPS) production, and another EPS production pathway activated by dextrin hydrolysis. Each pathway was described mathematically and incorporated into the mechanistic model structure. Batch cultures were carried out with six different carbon source compositions. Although parameters were estimated by using the experimental data from the two extreme cases such as glucose only and dextrin only, the model represented well the profiles of glucose, cell mass, and EPS concentrations for all the six different carbon source mixtures, showing a good interpolation capability. Of note, the lag in EPS production could be quite precisely predicted by assuming that the glucose-to-cell mass ratio was the governing factor for EPS production.

• 한국펄프종이공학회:학술대회논문집
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• 한국펄프종이공학회 2011년도 춘계학술발표회 논문집
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• pp.81-91
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• 2011

Current fuel ethanol research and development deals with process engineering trends for improving biotechnological production of ethanol. Recently, a large amount of studies regarding the utilization of lignocellulosic biomass as a good feedstock for producing fuel ethanol is being carried out worldwide. The plant biomass is mainly composed of cellulose, hemicellulose and lignin. The main challenge in the conversion of biomass into ethanol is the complex, rigid and harsh structures which require efficient process and cost effective to break down. The isolation of microorganisms is one of the means for obtaining enzymes with properties suitable for industrial applications. For these reasons, crude cultures containing cellulosic biomass degrading microorganisms were isolated from rice field soil, cow farm soil and rotten rice straw from cow farm. Carboxymethyl cellulose (CMC), xylan and Avicel (microcrystalline cellulose) degradation zone of clearance on agar platefrom rice field soil resulted approximately at 25 mm, 24 mm and 22 mm respectively. As for cow farm soil, CMC, xylan and Avicel degradation clearancezone on agar plate resulted around at 24mm, 23mm and 21 mm respectively. Rotten rice straw from cow farm also resulted for CMC, xylan and Avicel degradation zone almost at 24 mm, 23 mm and 22 mm respectively. The objective of this study is to isolatebiomass degrading microbial strains having good efficiency in cellulose hydrolysis and observed the effects of different substrates (CMC, xylan and Avicel) on the production of cellulase enzymes (endo-glucanase, exo-glucanase, cellobiase, xylanase and avicelase) for producing low cost biofuel from cellulosic materials.

• 대한산업공학회지
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• 제32권2호
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• pp.104-110
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• 2006

When a new facility such as automobile assembly line is designed, computer simulation is often used to estimate its actual throughput level. If it falls short of the target throughput level, then the design must be modified to increase the throughput capacity. For complex facilities having parallel processes and network of material flows, the modification procedure is not trivial. Even if the capacity of a particular bottleneck process is increased, the target throughput may not be achieved because the bottleneck may move to another process. Furthermore, each process has a different set of options with different cost to increase the capacity. In this study, we present a systematic procedure of determining the cost-effective set of options which achieves the target throughput.

• 대한기계학회논문집A
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• 제28권12호
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• pp.1871-1876
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• 2004

We demonstrate a novel fabrication technology for the microneedle array that can be used in the medical test field, which is transdermal drug delivery and blood analyte sampling. Previous researchers have used silicon-processed micromachining, a reactive ion etching, and molding techniques for the fabrication of microneedle array. However, these fabrication techniques have somewhat limitations apply to the microneedle array fabrication according to its application. Inclined LIGA process is suggested to overcome these problems. This process provides easier, sharper and longer out-of-plane microneedle array structure than conventional silicon-processed fabrication method did. Additionally, because of the advantage of the LIGA process based on mold fabrication for mass production, the polymer, PMMA(PolyMethylMethAcrylate), based microneedle array is useful as the mold base of nickel electroplating process; on the other hand, silicon-processed microneedle array is used in itself. In this research, we fabricate different types of out-of-plane microneedle array, which have different shape of tip, base and hole structure, using the inclined LIGA process. The fabricated microneedles have proper mechanical strength, height and sharpness to puncture human hand epidermis or dermis with less pain and without needle tip break during penetrating the skin.

• 소성∙가공
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• 제10권3호
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• pp.193-199
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• 2001

Forming more than two parts of sheet metal in a single stamping operation lowers production costs, reduces weight, and heightens dimensional accuracy. The tailored blank (TB) is a laser-welded or mash-seam-welded sheet metal with different thicknesses, different strengths, or different coatings. Recently, automotive manufacturers have been interested in tailored blanks because of their desire to improve the rigidity, weight reduction, crash durability, and cost savings. Therefore the application to auto-bodies has increased. However, as tailored blanks do not behave like un-welded blanks in press forming operations, stamping engineers no longer rely on conventional forming techniques. Field try-outs are very important manufacturing processes for an economic die-making. In the field try-outs, the rounded geometries of tool and the drawbead shape and size in die face are generally modified when the forming defects can not be removed by the adjustment of forming process parameters. In this study, the field try-outs of tailored door inner panel are introduced and evaluated. The behaviours of laser tailored blank associated with different thickness combinations in the forming process of door inner panel are described focusing on terms of experimental investigations on the formability.

• 한국의상디자인학회지
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• 제10권3호
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• pp.137-148
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• 2008

This article investigates the production process of knitwear focused on patterns and armhole forms in order to provide basic data for its value-added production. This study was based on empirical data obtained by questionnaires given to 51 respondents employed at knitwear companies. The data had been statistically analyzed with frequency analysis, one-way ANOVA, and Duncan test. The results of this study are the following: First, many knitwear companies used knitting machines, which had gauges as high as 14G. Second, most knitwears companies did not use patterns in the production process. Third, most knitwear companies produced knitwears in which armhole lines were different between the front part and back part of the body, while identical between the front and back parts of the sleeves. Fourth, people with experience in the knitwear industry had the tendency to recognize that armhole lines should be different between the front part of both the body and sleeves and their back part as well, and workers in charge of knitting recognized better than programmers and designers did. Considering the opinions of experienced workers that armhole lines differ between the front and back parts of both the body and sleeves would improve the appearance of knitwear, this study also suggests knitwear patterns of 10G and 16G by using ESMODE's basic knitwear pattern.

• 한국잠사곤충학회지
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• 제10권
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• pp.99-105
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• 1969

1968년도 우리나라 제사공장경영실태조사분석결과 다음과 같은 성적을 얻었다. 1. 공장당 1 일평균구견량은 약 10,800kg, 선견량은 105kg/인이였으며 건견량은 8683kg/일이며 42%가 저온건견되고 있다. 2. 자견기의 길이(m)별 자견능력은 50g/min이나 대인 자견능력은 시설규모가 큰 공장에서 적었다. 3. 대당 월간생사생산량은 6,000kg내외이고 대규모공장에서는 대당 월간생산량이 적은 경향이였다. 4. 규모별 생사 kg당 인건비는 소규모공장에서 제일 높았고 200~300대공장에서 제일 적었다. 5. 공장별로 분석한 6가지 요인중 다조조사인 경우 조사공정의 인건비가 제일 높았으므로 생사생산비의 절감은 자동화에 의한 조사인건비를 감소시켜야 할 것이다. 6. 제시된 6가지 요인이 차지하는 인건비는 약 46%가 상관하고 나머지 54%는 다른 요인이 생산비를 영향하고 있는 것으로 추정된다.

• 융합정보논문지
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• 제9권1호
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• pp.116-122
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• 2019

최근 중소기업은 세계적인 경쟁력을 갖추기 위해서 공정/품질/에너지 데이터 집계가 자동 또는 실시간으로 처리할 수 있는 산업 구조로 급격하게 변화하고 있다. 특히, 중소기업 생산 공정에서 생산되는 실시간 정보 분석은 중소기업의 유의미한 성과들을 분석, 예측, 처방 및 이행하는 새로운 공정 프로세스 형태로 진화해 가고 있다. 본 논문에서는 중소기업에서 생상되는 데이터를 고도화할 수 있도록 중소기업의 자동화 생산 정보 시스템을 빅데이터화 할 수 있는 플랫폼 구축 모델을 제안한다. 제안 모델은 스마트한 중소기업의 데이터 수집을 위해 중소기업에서 생산되는 제품의 기본 정보에 대한 다양한 데이터를 활용해 중소기업의 운영 효율화(컨설팅 및 교육 등) 및 전략적 의사결정을 지원할 수 있는 기능이 있다. 또한, 제안 모델은 종소기업의 정보 공유 및 시스템 연계가 원활하게 서로 다른 지역적 특성 및 분야를 가지는 중소기업들간에 긴밀한 협조가 가능한 것이 특징이다.