• Title/Summary/Keyword: Screening

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A Study on the Multistage Screening Procedure when Inspection Errors are Present (검사 오류를 고려한 다단계 선별절차에 관한 연구)

  • Kwon, Hyuck-Moo;Kim, Young-Jin
    • Journal of Korean Society for Quality Management
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    • v.33 no.4
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    • pp.88-95
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    • 2005
  • Multistage screening is a common practice when a component has a critical effect on the function of the assembly. A defect in a component might incur malfunction of an electronic device, resulting in a great amount of loss. Multistage screening, including duplicated screening inspections, may provide a good solution for this problem when inspection errors are present. In the company studied here, the manufacturing process of the multiple layer chip capacitor includes two-stage screening. In the first stage, screening inspection is performed repeatedly until no defects are found in the lot. In the second stage, sampling inspection is performed by a group of experts prior to shipment. In this article, we review the procedure used in the field and suggest a revised model of the multiple screening procedure and solution method for this situation. The usefulness of the proposed model is discussed through a practical example.

A Case-Based New Financial Product Screening System

  • Lee, Hoon-Young
    • Journal of the Korean Operations Research and Management Science Society
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    • v.19 no.3
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    • pp.151-167
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    • 1994
  • Initial screening is one of the most important and difficult processes in new product development. Many new product screening models have been developed in management and marketing. However practical applications of these models have been limited in part due to their complexity and inflexibility, and in part due to their excessive data requirements. Thus simple judgment models have been popular in practice. However, these models suffer from inaccuracy and inconsistency originating form human cognitive limitations. In light of the problem swith traditional screening methods, we propose a new approach for screening based on managers' past experience and intuitive judgments-screening by analogy, and develop a computerized case-based system for screening new financial service concepts. Using the system, managers can predict the potential performance of a new product concept based on the performance of past products that are similar to it in terms of product characteristics, firm's resources, and market conditions. Based on this prediction, managers make a screening decision.

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Economic Component Screening Procedures for Multi-Component Products Supplied with Warranty (조립제품을 구성하는 부품에 대한 전수검사 방식의 경제적 설계)

  • Chang, Young-Soon;Bai, Do-Sun
    • Journal of Korean Institute of Industrial Engineers
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    • v.27 no.4
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    • pp.366-373
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    • 2001
  • Economic component screening procedures for multi-component assembly products supplied with warranty are proposed. It is assumed that the screening variable is continuous and the performance variable is dichotomous. Logistic and normal models are considered; the proportion of conforming items is a logistic function of the screening variable in the logistic model and the screening variable given the performance variable is normally distributed in the normal model. Cost models are constructed which involve three cost components; screening inspection cost for each component, cost due to disposing a rejected component, and warranty cost for an assembly product. Methods of finding the optimal screening procedures are presented and numerical examples are given.

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Design of Rectifying Screening Procedures (선별형 스크리닝 절차의 설계)

  • Hong Seong-Hun;Choi Ik-Jun
    • Proceedings of the Korean Operations and Management Science Society Conference
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    • 2006.05a
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    • pp.70-77
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    • 2006
  • When the nature of measuring a performance variable is destructive or very expensive, it is attractive to use a surrogate variable which is highly correlated with the performance variable and less expensive to measure. In this paper, we propose rectifying screening procedures using the performance and surrogate variables. Two screening procedures are considered; a statistically-based screening procedure to reduce the current proportion of nonconforming items to a specified lower value after screening, and a economically-based screening procedure where the screening limit is determined so that the expected cost is minimized. It is assumed that the surrogate variable given the performance variable is normally distributed with known mean and standard deviation. For two screening procedures, methods of finding the optimal solutions are presented and numerical examples are also given.

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Screening of New Antibiotics Inhibiting Bacterial Methionyl-tRNA Synthetase (세균의 Methionyl-tRNA Synthetase를 저해하는 새로운 항생물질의 스크리닝)

  • 곽진환;조영준;송난규
    • YAKHAK HOEJI
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    • v.45 no.3
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    • pp.245-250
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    • 2001
  • Aminoacyl tRNA synthetases of bacteria are known as potential targets for new anti-microbial agents. To isolate new inhibitors of bacterial methionyl-tRNA synthetases from natural sources, a new target-oriented screening system using whole cells which are over-expressing a target enzyme was developed. Approximately 8,000 culture broths of microorganisms from soils were tested by this screening system. Among them, ten culture broths was found to contain inhibitory activity against methionyl -tRNA synthetases of Escherichia coli. For the validation of the screening system, this new method was compared with in vitro enzymatic method. Seven out of 10 culture broths showed inhibitory activity against methionyl-tRNA synthetases of E. coli. This result showed that the new screening system was comparable to the enzyme assay. Thus we believe that our screening system as a new method can be applied for the screening of new antibiotics inhibiting bacterial methionyl-tRNA synthetases from natural products.

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Importance of Early Diagnosis and Screening, Lessons from Gastric Cancer and Colorectal Cancer

  • Seun Ja Park
    • Journal of Digestive Cancer Research
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    • v.2 no.1
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    • pp.5-7
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    • 2014
  • Screening and early diagnosis of cancer is important. Screening lead to detect disease earlier, and earlier treatment of disease cause to yield a better outcome than treatment at the onset of symptoms. Some studies suggest that gastric cancer screening may be associated with a reduced risk of mortality from gastric cancer, although there are no definitive data from large controlled trials. Regular colorectal cancer screening or testing is one of the most powerful weapons for preventing colorectal cancer, because some polyps, or growths can be found and removed before they have the chance to turn into cancer. Screening can also result in finding colorectal cancer early, when it is highly curable. In conclusion, to increase utilization of screening is important to decrease gastric and colorectal cancer morbidity and mortality.

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The Determinants of the Use of Opportunistic Screening Programs in Korea (민간검진 서비스의 이용현황과 결정요인)

  • Kang, Sung-Wook;You, Chang-Hoon;Kwon, Young-Dae
    • Journal of Preventive Medicine and Public Health
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    • v.42 no.3
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    • pp.177-182
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    • 2009
  • Objectives : Both organized and opportunistic screening programs have been widely used in Korea. This paper examined the determinants of the use of opportunistic screening programs in Korea. Methods : The subjects were a national stratified random sample of 10,254 people aged 45 or older from the first wave of the Korean Longitudinal Study of Ageing in 2006. A logit model was used to examine the determinants of the use of opportunistic screening programs in terms of the demographic and socioeconomic characteristics, the type of health insurance and the health status. Results : Thirteen point seven percent of the individuals received opportunistic screening programs within 2 years from the time the survey was conducted in 2006. The individuals who graduated from college or who had even more education were 3.0 times more likely to use opportunistic screening programs compared with the individuals who were illiterate. The individuals who resided in urban areas and who had religious beliefs were more likely to receive opportunistic screening programs compared with their counterparts. Those who were in the first quartile for the total household assets were 2.6 times more likely to use opportunistic screening programs than those who were in the fourth quartile for the total household assets. Privately insured people were 1.6 times more likely to use opportunistic screening programs than those who were not insured. Finally, the individuals who self-assessed their health status as worst were 2.1 times more likely to use opportunistic screening programs compared individuals who self-assessed their health status as best. Conclusions : This study suggests that opportunistic screening programs can be an indicator for whether or not an individual is among the advantaged group in terms of their socioeconomic characteristics and type of health insurance.