• 산업경영시스템학회지
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• 제22권49호
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• pp.11-21
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• 1999

The purpose of this study is to present the method to select optimal size for the industrial products which are closely related to human's body size. For this purpose, human factors such as body characteristics, body features, and preference in product selection which needs to be considered in setting standards were analyzed. This analysis is to select optimal size to minimize losses caused by the difference of size between demand by the customers and supply from the manufacturers. Using loss function, repetitive calculation process algorithm by using bisearch method was applied in selecting the sizes of demand and supply which minimize the total expected losses. For cumulative normal distribution probability, IMSL routine DNORDF was used. In case study, comparison has been made between the result which was calculated using presented algorithm and the results calculated by the process currently used by KS and ISO by measuring aged women's body size in human factors side and sorting them through the factor analysis and cluster analysis for feature factor extraction. Thus, they can be used as a basis for establishing industrial product standards.

• 대한인간공학회지
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• 제31권2호
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• pp.389-396
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• 2012

Objective: The aim of this study is to design an auto showering system regarding bed type for old people or bedridden patients. Background: The rapid growth concerning the aging population leads to an increase in elderly bedridden patients living in senior care centers and hospitals where care givers have difficulty bathing older people with limited mobility. Method: In this study, a showering equipment for experiment was based on anthropometric and researching existing products. The nozzle position was optimized by showering tests and simulations using showering equipment. Results: The problems regarding the existing products were analyzed and the nozzle position was optimized through showering tests. The number, position, and spraying angle of the nozzle were optimized through showering simulations. The automatic showering system concerning bed type was designed by considering their results. Conclusion: When designing an automatic showering system, the most important design element involves determining the position of nozzle and angle of water injection and the number of nozzles. The system was developed by applying the results through user centered-research. Application: The user centered-research for developing products was applied directly in order to develop automatic baths, showering products etc. Furthermore, it was also available to be applied towards senior friendly products.

• 경영과정보연구
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• 제38권2호
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• pp.165-182
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• 2019

이 연구는 미래에 시장에 도입될 4차산업혁명 신제품의 소비자 수용 과정을 조사하였다. 4차산업혁명 신제품들은 기존 신제품에 비해 기술적으로 많은 진보를 보이는 신제품으로 본 연구에서는 과거에 활용되었던 기술수용모델을 수정하여 4차산업혁명 신제품의 사회적 영향, 기대되는 체험, 지각된 위험 등과 같은 변수들이 반영되여 수정한 모델이 제안되고 검증되었다. 4차산업혁명의 대표적인 6가지 신제품을 선정하여 각 40여명의 응답자들에게 조사하였고 SPSS 및 AMOS 등의 프로그램을 이용해 가설을 검증하였다. 그리고 결과 및 시사점은 다음과 같다. 첫째, 4차산업혁명 신제품의 혁신성은 기대된 체험 및 지각된 유용성과 같은 긍정적인 평가 요소에 영향을 미쳤으며 지각된 위험과 같은 부정적인 요소에도 정의영향을 미치는 것으로 나타났다. 그리고 4차 산업혁명 신제품의 기대된 체험은 지각된 유용성 및 사회적 영향에 큰 영향을 미쳤지만 지각된 위험을 낮추는 데는 통계적으로 유의한 영향을 미치지 않는 것으로 나타났다. TAM 모델의 결과와 마찬가지로, 4차산업 혁명 신제품의 지각된 유용성은 구매의도에 강한 영향을 미치는 것으로 나타났다. 마지막으로, 4차산업혁명의 신제품의 대한 지각된 위험은 구매의도에 통계적으로 유의한 영향을 미치지 않았으며, 4차산업혁명의 사회적 영향은 구매의도에 유의한 영향을 미쳤다. 일반적으로 응답자들은 4차산업혁명의 사회적 영향을 잘 알고 있으며 긍정적으로 평가하고 있는 것으로 판단된다. 본 연구는 컨버전스 제품의 대표격인 스마트폰을 대상으로 해당 스마트폰에서 광고의 양, 하드웨어 다양성, 소프트웨어의 다양성 등이 스마트폰에 대한 유용성 지각과 복잡성 지각에 동시에 영향을 줄 수 있고 복잡성은 기능적 피로에 영향을 미칠 수 있다는 것을 검증하려고 하였다.

• 정보화정책
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• 제29권3호
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• pp.26-47
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• 2022

'산업융합 신제품의 적합성 인증제도' (적합성 인증제도)는 개별 법령상에 융합 신제품에 적합한 인증 기준이 아직 준비되지 않았을 때, 별도의 입법 없이도 산업융합 촉진법에서 정한 바에 따라 동일 효력의 인증을 부여할 수 있는 법적 인증제도이다. 적합성 인증제도는 다른 인증제도들과 달리 규제 시차로 인한 융합 신제품의 인증애로를 해소하는 특성이 있다. 그럼에도 적합성 인증제도를 규제 개선의 관점에서 세부적으로 분석한 연구는 드물었다. 본 연구는 규제 문제가 발생 후 해소되기까지의 과정에 적합성 인증의 단계들을 순차적으로 매칭하여, 융합 신제품의 규제 시차가 적합성 인증의 절차를 통해 어떻게 감소되는지를 설명하였다. 나아가, 규제 시차 관리에 대한 관점을 정량적 측면과 정성적 측면으로 나누고, 규제 시차 감소를 위한 적합성 인증제도의 정량적·정성적 체계를 인증 절차의 각 단계별로 분석하였다. 이를 통해 본 연구는 적합성 인증제도가 융합 신제품의 규제 시차 문제를 해소할 수 있는 이유는 인증 절차별 법적 기한과 같은, 제도의 구조적 설계사항(정량적 측면) 뿐만 아니라, 개별 절차의 품질 확보를 위한 정성적 체계들을 갖추고 있기 때문임을 강조하였다.

• Journal of Microbiology and Biotechnology
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• 제16권6호
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• pp.849-854
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• 2006

The effects of Haematococcus pluvialis extracellular products on microbial growth and bacteriocin production were investigated to improve bacteriocin synthesis during the growth cycle of Lactobacilli. Lactobacillus pentosus KJ-108, L. plantarum KJ-10311, and L. sakei KJ-2008 were cultured in MRS and enriched medium (ERM) with or without supplement of the extracellular products obtained from a late exponential phase culture of Haematococcus pluvialis in modified Bold's basal medium (MBBM). In both MRS and ERM, the extracellular products strongly enhanced the growth as well as the bacteriocin production of all the lactic acid bacteria tested. The enhancing effect was observed in ERM with pH adjusted at 5 and 6. In addition, some difference in growth effects with the extracellular products of H. pluvialis was observed between pH 5 and 6 in ERM, but no effect was observed in the minimal medium. The final biomass and the final concentration of bacteriocin activity were associated with the cell growth that was promoted by the extracellular products of H. pluvialis, and the enhanced cell growth of the three lactic acid bacterial strains induced the increase of the specific bacteriocin production. Therefore, bacteriocin production and activity were influenced by the addition of the extracellular products of H. pluvialis in the culture medium.

• International Journal of Industrial Entomology and Biomaterials
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• 제48권3호
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• pp.147-155
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• 2024

This study aimed to validate the nutritional superiority and safety of fermented coffee byproducts (CB) and fermented oyster mushroom cultivation by-products (OMCB) as alternative food sources for Protaetia brevitarsis larvae. Thus, we conducted a comparative analysis of the nutrient composition of the food sources and developmental characteristics of the larvae. P. brevitarsis larvae have traditionally utilized various by-products as food sources and are able to efficiently utilize these. The analysis of the nutrient composition of the food sources indicated that, in comparison to control group fermented oak sawdust (FOS), the content of crude protein was 2.2 folds higher in larvae fed with OMCB and 3.2 folds higher in larvae fed with fermented 50% CB + 50% OMCB (CB + OMCB). Moreover, the cellulose content, utilized as a nutritional source for the larvae, was 1.3 folds higher in the CB + OMCB group than in the control group. Significantly, the weight of larvae fed with OMCB and CB + OMCB increased 1.7-4.2 folds compared to those fed with FOS. Additionally, the survival rate of larvae before the formation of pupal cells was over 90% in all groups. Therefore, it was concluded that CB and OMCB contain various nutrients without harmful composition and have a larval growth-promoting effect. Consequently, they are considered appropriate dietary materials for P. brevitarsis larvae. This study enhances our understanding of by-product usages by P. brevitarsis larvae and confirms their potential as sustainable food resources.

• 산업경영시스템학회지
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• 제41권2호
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• pp.159-166
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• 2018

The proliferation of information technologies made it possible to produce information products of different versions at much lower cost comparing to traditional physical products. Thus it is common for information product manufacturers to consider vertically differentiated product line for more profit through improved market coverage. Another salient characteristic of most information product is network externality. Existing researches dealing with vertical differentiation and network externality usually assumed oligopolistic market where vertically differentiated products are provided by competing companies, respectively. Moreover, they analyzed the essentially dynamic characteristic of network externality statically. In this study, different from the previous researches, the vertical differentiation strategy of a monopolistic company under network externality is dynamically analyzed. We used a two-period model to accommodate the dynamic feature of network externality. Based on the two-period model, the profit maximizing solutions are analyzed. The results showed that a monopolistic company has no incentive to differentiate products vertically when the network externality is absent. On the contrary, when the network externality exists, the monopolistic company can derive more profit by vertically differentiating the product line. It is also shown that, for more profit, the monopolistic company should keep the quality difference between the high quality product and the low quality product as greater as possible.

• 한국지반환경공학회 논문집
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• 제14권10호
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• pp.49-57
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• 2013

전남 여수, 광양지역을 중심으로 한 광양만권 지역의 공업기반 시설은 석유화학단지와 제철소 및 제철연관단지 등 대단위산업단지로 조성되어 있으며, 이중 여수산업단지에서만 발생되는 다양한 산업부산물의 발생량만도 160만 톤이나 이들의 재활용률은 52%에 불과하다. 한편 우리나라의 천연골재의 채취 가능량은 80억$m^3$이며, 연간 수요량 2.4억$m^3$을 고려하면 33년간만 채취가 가능하며, 골재채취로 인한 환경파괴 등으로 정부는 연간 골재 채취량을 제한하고 있다. 이와 같은 환경과 자원의 문제가 국가적인 차원의 중요한 문제로 대두되고 있는 가운데, 각종 산업부산물의 재자원화를 위한 다양한 연구가 요구되고 있는 실정이다. 이 논문에서는 광양만권 산업부산물의 적절한 대량 처리방안과 광양만권 연약지반 건설현장의 경제적인 골재확보 방안의 일환으로, 인산석고와 슬래그를 이용한 인공골재를 제작하고 연약지반 개량을 위한 배수재로의 활용방안을 검토하였다. 인공골재의 제작 시 소정의 강도를 가지며, 인산석고와 슬래그 등 산업부산물의 재활용을 극대화하기 위하여 소량의 시멘트를 첨가하였으며 비소성 방식으로 제작하였다. 제조된 인공골재를 배수재용 골재로 사용하기 위해 시방기준의 검토를 위한 입도시험, 정수위 투수시험과 대형직접전 단시험을 실시한 결과, 인공골재에는 #200체 통과량이 15% 이하이며, 투수계수 $1{\times}10^{-3}cm/sec$ 이상인 시방기준을 충분히 만족하는 것으로 나타났다. 또한 대형직접전단시험 결과 건조 시료는 천연 쇄석과 유사한 내부마찰각을 가지며, 24시간 수침조건에서도 해사보다 우수한 것으로 나타나 연약지반에서 장비주행을 위한 지지력 확보에도 매우 유용할 것으로 판단된다.

• 대한산업공학회지
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• 제11권2호
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• pp.11-18
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• 1985

Three types of warranty policies are considered. They are (1) free warranty policy for repairable products, (2) free warranty policy for nonrepairable products, and (3) rebate warranty policy. Under each warranty policy, a single sampling attribute plan with non-destructive testing is considered. A sampling plan is characterized by the sample size and the acceptance number. For each case, characteristics of an optimum sampling plan are discussed and determined, which minimize the warranty cost and the corresponding quality control cost within the assigned producer's risk and consumer's risk.

• 대한산업공학회지
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• 제40권3호
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• pp.299-304
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• 2014

Objective : The present study was intended to develop a design ideation and evaluation process for the development of ecology-, ergonomics-, and economy-friendly ($E^3$-friendly) products. Background : Due to increasing social and legal requirements on global sustainability, manufacturing companies have made more efforts ever than before for the development of eco-friendly products. However, most eco-friendly products are often criticized due to lacking ergonomic and/or economic considerations. Method : An $E^3$-friendly product development process consisting of (1) survey of eco-friendly products, (2) characterization of eco-friendly products, (3) design ideation for $E^3$-friendly product, and (4) design idea evaluation for $E^3$-friendliness was established and applied to the development of a novel product which supports drinking of daily recommended amount of water. Results : Fifty-five design characteristics were identified by a survey of forty eco-friendly products and incorporated into the proposed ideation and evaluation process. New ideas and design changes were developed effectively using the proposed development process for a novel $E^3$-friendly bottle for support of water drinking. Conclusion : The proposed process was found effective for the development of eco-friendly design ideas and improvements. Application : The proposed system would be of use to develop better design ideas having market competitiveness.