• 한국융합학회논문지
• /
• 제12권9호
• /
• pp.39-47
• /
• 2021

본 연구에서는 계절적인 요인과 급변하는 상품의 트렌드를 사전예측하기 위해 로지스틱 회귀 알고리즘을 이용한 상품기획 예측 모형을 제안하고자 수행되었다. 먼저 웹크롤링을 이용하여 포털 사이트 및 온라인 마켓의 소비자의 비정형 데이터를 수집하고 정형 데이터 변환을 위한 전처리 작업을 통해 상품에 대한 의미 있는 정보를 분석하였다. 최종 수집된 11,200개의 데이터셋은 Logistic Regression을 이용하여 상품에 대한 소비자의 만족도, 빈도분석, 상품에 대한 장점과 단점을 분석할 수 있었다. 분석 결과 소비자의 만족도는 92%이었으며, 빈도분석을 통해 상품에 대한 불량이슈를 확인할 수 있었다. 또한, 개발된 상품 기획 예측 프로그램에 대한 사용 만족도, 시스템 효율성, 시스템 효과성 항목에 대한 분석결과에서도 만족도가 높게 나타났다. 특히, 불량이슈는 상품에 대한 현 문제를 신속히 인지하고 개선 전략을 수립하는데 필요한 정보를 제공한다는 점에서 매우 의미 있는 자료가 된다.

• 대한약학회:학술대회논문집
• /
• 대한약학회 2002년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.2
• /
• pp.366.1-366.1
• /
• 2002

Emerging medical technologies for effective and lasting repair of articular cartilage include delivery of cells or cell-seeded scaffolds to a defective site to initiate de novo tissue regeneration. In this respect. the availability of an appropriate biomaterial scaffold is crucial to allow chondrocyte growth and cartilaginous matrix deposition in a three-dimensional geometry. Hyaluronic acid (HA) molecules are anchored to the chondrocyte membrane via receptors, such as CD44. (omitted)

• International Journal of Fuzzy Logic and Intelligent Systems
• /
• 제11권3호
• /
• pp.211-216
• /
• 2011

The detection of defective parts in a factory is usually performed by the human eye. Therefore, heavy manpower is in demand for minor enterprises. An image processing system is desired to solve this drawback. However, due to the variety of the products characteristics, an general algorithm is needed that can adapt to these characteristics. Therefore, in this paper, the key pad parts' characteristics which need to be dealt with are analyzed in order to embody the image processing algorithm that is suggested. The experimental results show the probability of detecting a defective part is 95% with a detection time of 0.203 seconds, on the average.

• International Journal of Precision Engineering and Manufacturing
• /
• 제8권3호
• /
• pp.45-49
• /
• 2007

A gearing system emits inconsistent noises from the impact of gear teeth when defects are present, but it is not easy for a noise inspector on a production line to distinguish defective products objectively. Since customers constantly complain about various noises from geared motors, it is desirable to devise an analytical technique to classify motors. However, it is difficult to separate inconsistent noises due to defective gears from the overall noise produced by a geared motor using a general signal processing method such as a FFT because low frequency impulse signals have a tendency not to appear in the frequency domain. In this paper, we propose a method that can be used to obtain more objective estimates and measurements of inconsistent noises from a gearing system. The proposed method makes use of the cepstrum domain with an applied autocorrelation and comb lifter, followed by a domain inversion.

• 대한안전경영과학회지
• /
• 제18권2호
• /
• pp.119-125
• /
• 2016

The ratio which we usually use in producing products is nonconforming proportion or percent defective. As our modern society develops, we cannot but meet another proportion in legal, managerial, and medical areas where our human beings might commit various kinds of errors though they do not want them. In this paper we will generally call the ratio 'proportion.' When the size of such proportion as percent defective is observed by persons, it is not true proportion but apparent proportion because it has been observed with human or situational errors. Past studies have not systematically covered the analysis of relations between such proportions and type 1 and 2 error, but this paper analyses and derives such various relations, and it suggests the guideline as sixteen properties for utilization and sensitive analysis of the relations. Current paper's consideration of apparent proportion in addition to true proportion as our familiar concept will open and widen existing academic and application areas where people have mainly built societal, scientific and engineering rules and methods based only on true proportion.

• 대한안전경영과학회지
• /
• 제10권1호
• /
• pp.23-31
• /
• 2008

Recently, there is a rise of accident by some defective products, especially it reported that a serious fact is a defect of design causing some problem since execute a product liability(PL), people who use products have been able to bo remunerated for a damage to those defects, so responsibilities of companies are rising more and more. Therefore, companies that are obligated to manufacture a safety product, and should make preparation for PL. For solving the problem, even though manufacturers tried to make a safety product ay mixed ways, it is seldom that its safety is considered from planning a design. This thesis has suggested a way aimed at improving a safety of products through considering a stage of a plan, by searching and analyzing the design-process in to each steps.

• 대한안전경영과학회지
• /
• 제7권3호
• /
• pp.109-120
• /
• 2005

A company is liable for its products and has the responsibility to make good on any loss or damage incurred by the user of its product. The purpose of the Product Liability Act(PLA) is to protect consumers against damage caused by defective products, and contribute to the safety of the citizen's life and the sound development of the national economy by regulating the liability of manufacturers, etc. for damages caused by the defectiveness of their products. In this study, the cognition levels of consumers and producers for PLA were surveyed. The cognition levels of four factors of acknowledgement, comprehension, necessity and impact for PLA were assessed. The results were as follows : i) Acknowledgement and comprehension levels of consumer were assessed low but they assessed necessity and impact of PLA high; ii) Producers assessed necessity and impact of PLA higher than their acknowledgement and comprehension levels; iii) Overall cognition levels of producers were higher than those of consumers.

• 산업경영시스템학회지
• /
• 제32권4호
• /
• pp.192-202
• /
• 2009

Disassembly of products at their end-of-life (EOL) is a prerequisite for recycling or remanufacturing, since most products should be disassembled before being recycled or remanufactured as secondary parts or materials. In disassembly sequence planning of EOL products, considered are the uncertainty issues, i.e., defective parts or joints in an incoming product, disassembly damage, and imprecise net profits and costs. The paper deals with the problem of determining the disassembly level and corresponding sequence, with the objective of maximizing the overall profit under uncertainties in disassembly cost and/or revenue. The solution is represented as the longest path on a directed acyclic graph where parameter (arc length) uncertainties are modeled in the form of intervals. And, a heuristic algorithm is developed to find a path with the minimum worst case regret, since the problem is NP-hard. Computational experiments are carried out to show the performance of the proposed algorithm compared with the mixed integer programming model and Conde's heuristic algorithm.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2012년도 춘계학술대회 논문집
• /
• pp.459-460
• /
• 2012

• 한국안전학회지
• /
• 제14권4호
• /
• pp.182-191
• /
• 1999

Product liability(PL) and product safety(PS) is one of the most costly and confusing problems facing manufacturing today. Accordingly, this paper presents an integral process for product safety and product liability resulting from a defective product and proposes countermeasures of PL and PS for the four types of risk based on severity and frequency. Finally, we have presented a framework and practical procedure to provide the manufacturer with useful way of analyzing the risk potential of consumer products.