• 대한산업공학회지
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• 제24권2호
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• pp.185-197
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• 1998

Engineering design involves the specification of many variables that define a product, how it is made, and how it behaves. Before some variables can be determined, other variables must first be known or assumed. This fact implies a precedence order of the variables, and of the tasks of determining these variable consequently. Moreover, design of complex systems may involve a large number of design activities. In this paper, the activity-activity incidence matrix is considered as a representation of design activity analysis which mainly focuses on the precedence constraint. In order to analyze the activity-activity incidence matrix, a heuristic algorithm is proposed, which transforms an activity-activity, parameter-formula, and parameter-parameter incidence matrix into a lower triangular form. The analysis of the structured matrices can not only significantly reduce the overall project complexity by reorganizing few critical tasks in practice, but also aims at obtaining shorter times considering the solution structure by exploring concurrency.

• 산업경영시스템학회지
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• 제37권4호
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• pp.72-81
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• 2014

Even though two-hands lifting/lowering activity of manual materials handling tasks are prevalent at the industrial site, many manual materials handling tasks which require the worker to perform one-hand lifting/lowering are also very common at the industrial site, forestry, farming, and daily life. The objective of this study was to compare one-hand lowering activity to lifting activity in terms of biomechanical stress for the range of lowering heights from knuckle height to 10cm above floor level with two workload 7.5kg and 15.0kg. Eight male subjects with LMM were asked to perform lifting/lowering tasks using both a one-handed (left-hand and right-hand) as well as a two-handed technique. Spinal loading was estimated through an EMG-assisted free-dynamic biomechanical model. The biomechanical stress of one-hand lowering activity was shown to be 43% lower than that of one-hand lifting activity. It was claimed that the biomechanical stress for one-hand lifting/lowering activity is almost twice (194%) of the one for two-hands lifting/lowering activity. It was also found that biomechanical stress by one-hand lowering/lifting activity with the half workload of two-hands lowering/lifting activity was greater than that of the two-hands lowering/lifting activity. Therefore, it might be a risk to consider the RWL of one-hand lowering/lifting activity to simply be a half of the RWL of two-hands lowering/lifting activity recommended by NIOSH.

• 산업경영시스템학회지
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• 제9권13호
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• pp.63-74
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• 1986

Rarely can it be anticipated that such a quality system as "Small group activity" of Japanese companies can be infused and placed as it is into Korean companies without any modification or troubles, as above two nations have developed and furnished their own social and cultural backgrounds. Therefore this study is made by inducing comparative '||'&'||' analytical methods to draw out and suggest the desirable direction which should be pursued by "Small group activity" of Korean companies.n companies.

• 산업경영시스템학회지
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• 제17권30호
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• pp.67-71
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• 1994

Quality Control Circle activity is widely introcuced by manufacturing industries. Q.C.C. is studied not only in relation with five points of view such as corporate culture, labor union, organizational management model in Korea, the Theory W and educational revolution etc. but also in social, cultural background, and national trait's view points. The main goal of this study is to investigate sucessful role and active application in Quality Control Circle activity.

• Journal of Ginseng Research
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• 제39권2호
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• pp.178-182
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• 2015

Background: Fermentation technology is widely used to alter the effective components of ginseng. This study was carried out to analyze the characteristics and antioxidant activity of ginseng seeds fermented by Bacillus, Lactobacillus, and Pediococcus strains. Methods: For ginseng seed fermentation, 1% of each strainwas inoculated on sterilized ginseng seeds and then incubated at $30^{\circ}C$ for 24 h in an incubator. Results: The total sugar content, acidic polysaccharides, and phenolic compounds, including p-coumaric acid, were higher in extracts of fermented ginseng seeds compared to a nonfermented control, and highest in extracts fermented with B. subtilis KFRI 1127. Fermentation led to higher antioxidant activity. The 2,2'-azine-bis-(3-ethylbenzothiazoline-6-sulfonic acid (ABTS) radical scavenging activity was higher in ginseng seeds fermented by Bacillus subtilis than by Lactobacillus and Pediococcus, but Superoxide dismutase (SOD) enzyme activity was higher in ginseng seeds fermented by Lactobacillus and Pediococcus. Conclusion: Antioxidant activities measured by ABTS and SOD were higher in fermented ginseng seeds compared to nonfermented ginseng seeds. These results may contribute to improving the antioxidant activity and quality of ginseng subjected to fermentation treatments.

• 대한산업공학회지
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• 제40권5호
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• pp.492-500
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• 2014

Activity monitoring has been widely recognized as important and critical tools in system monitoring for detection of abnormal behavior. In this research, we propose a data-driven activity monitoring method to measure relative sales performance which is not sensitive to special event which frequently occur in marketing area. Moreover, the proposed method can automatically updates the monitoring threshold that accommodates a drastically changing business environment. The results from simulation and practical case study from sales of electronic devices demonstrate the usefulness and applicability of the proposed activity monitoring method.

• 산업경영시스템학회지
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• 제34권4호
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• pp.42-48
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• 2011

This paper proposes performance measurement method of quality small-group activity in business. This paper collects and analyzes quality circle activities data respect to tangible and intangible effect in national quality circles competitions festival. This paper proposes QPI (quality-circle performance index) based on Balanced Scorecard for quality small-group activity in quality improvement area. QPI is to measure the performance of quality improvement activities in the business firms. QPI is able to use widely in industries to provide a performance measure of quality small-group activity. In this paper, we propose the application method of QPl.

• Mycobiology
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• 제43권1호
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• pp.57-62
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• 2015

${\beta}$-Glucosidase, which hydrolyzes cellobiose into two glucoses, plays an important role in the process of saccharification of the lignocellulosic biomass. In this study, we optimized the activity of ${\beta}$-glucosidase of brown-rot fungus Fomitopsis pinicola KCTC 6208 using the response surface methodology (RSM) with various concentrations of glucose, yeast extract and ascorbic acid, which are the most significant nutrients for activity of ${\beta}$-glucosidase. The highest activity of ${\beta}$-glucosidase was achieved 3.02% of glucose, 4.35% of yeast extract, and 7.41% ascorbic acid where ascorbic acid was most effective. The maximum activity of ${\beta}$-glucosidase predicted by the RSM was 15.34 U/mg, which was similar to the experimental value 14.90 U/mg at the 16th day of incubation. This optimized activity of ${\beta}$-glucosidase was 23.6 times higher than the preliminary activity value, 0.63 U/mg, and was also much higher than previous values reported in other fungi strains. Therefore, a simplified medium supplemented with a cheap vitamin source, such as ascorbic acid, could be a cost effective mean of increasing ${\beta}$-glucosidase activity.

• 한국항행학회논문지
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• 제19권1호
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• pp.85-90
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• 2015

본 논문은 실버 세대에게 양질의 돌봄 서비스를 제공하기 위한 사물인터넷 기반의 텔레케어 시스템을 제안한다. 제안한 시스템은 활동량 감지기를 포함한 각종 센서와 사용자 휴대용 응급호출기, 게이트웨이 역할을 수행하는 응급전화기와 텔레케어 서비스 플랫폼인 서버로 구성된다. 특히 활동량 분석을 위해 활동량 인덱스라는 계량화 방안을 제시하고 이를 통해 수집된 일간/주간/월간 활동량 정보를 통해, 실버세대 마다 활동 패턴을 도출하고 변화 감지를 통해 이상 상황을 적절하게 대응할 수 있도록 구현하였다.

• 산업경영시스템학회지
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• 제29권3호
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• pp.15-24
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• 2006

As Gyoto Agreement, the Climate Change Agreement, has become effective, total weight restriction on waste has started in each country and environment issue becomes one of the most important global issues. Therefore, environmental logistics became important matter, and industries need to establish production system for environmental conscious products and services. In this paper, we compare and analyze environmental conscious logistics activity(ECLA) that affect Carbon Dioxide Discharge(CDD) and packaging waste caused by logistics activity in Korea and Japan. We also propose the optimal alternative to the problem by this comparison and analysis.