• 서비스연구
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• 제13권1호
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• pp.159-175
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• 2023

대량 생산은 오랫동안 다양한 제품 생산방법으로서 기업의 전략을 수립하는 데 있어 가장 중요한 생산 패러다임이었다. 하지만 기업의 경쟁 환경과 소비자의 요구가 다양화함에 따라 이제는 대량 생산이 가장 중요한 패러다임이 될 수 없다. 특히 소비자들의 요구사항은 더욱 다양해지며, 빠르게 변화하여 기업들은 소비자들의요구에 대응하기 힘들어 지고 있다. 대량 맞춤(Mass Customization)은 이런 흐름을 반영하여 가장 주목 받는 패러다임으로서 대량 맞춤은 고객의 요구에 맞춘 다양한 제품을 저렴한 비용으로 생산해 내는 것이 목적이다. 본 연구에서는 프로덕트 아키텍처 시스템(Product Architecture System)의 이론과 개념을 활용하여 대량 맞춤형 서비스를 실현하는 방법을 구체화하였고 이를 캠핑카의 내부 퍼니처 모델 중심으로 사례 연구하였다. 특히 기존에 기업에서 생산성을 중심으로 제품 플랫폼(Product Platform)과 모듈(Module)을 개발하던 것과는 달리, 소비자의 요구사항을 최우선으로 반영하여 제품 플랫폼(Product Platform)과 모듈(Module)을 개발하고 구성하는 방법을 제시하였고, 그 효용성에 대해 고찰하였다. 연구 결과로는 프로덕트 아키텍처 시스템의 내부 요인을 통해 디자인하고 외부 요인으로 결과물의 효과성을 검증하여 교체성, 재활용성, 라인업, 충전성 등에서 효과적임을 확인할 수 있었다. 추후 프로덕트 아키텍처 시스템을 활용한 디자인 프로세스를 통해 추가적인 실증연구로 이어지길 기대한다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 1996년도 춘계학술대회논문집; 부산수산대학교, 10 May 1996
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• pp.169-176
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• 1996

In order to suppress the structural vibration more effectively, Multiple Tuned Mass Damper(MTMD) which is composed of a number of Tuned Mass Damper(TMD) can be used. Especially, the passive MTMD has several advantages over active TMD like easy installment and maintenance, cost and performance for power failure situation(severe damage of power lines from earthquake), etc.. For this purpose the mass and damping ratio of MTMD and the distributed frequency range which shows the range of MTMD's distribution are used as main design parameters. When the passive MTMD is constituted with multiple cantilevers, the facility in its real production and its need for only a smaller space can be named as its several advantages. In this study, the satisfactory results were obtained from the composition of MTMD utilizing dynamic characters of cantilevers, and the verification was done by the comparison of the analysis from MTMD with the computer simulation.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1995년도 추계학술대회 논문집
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• pp.638-641
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• 1995

The model-technology has been conduced to a large quantity of automobile and electric products. However, many problems in mold-technology have been solved through trial and error of experts. So it has given rise to overdesign of mold and generated other problems in production line. In this paper we choosed the lower-mold of a cool chamber in refrigerator as the model of the study and mass reduced overdesigned mold. In mass reduction process, several cases in plane processing error were selected for the sample case through FEM analysis & simplicated theory analysis and each case was evaluated for mass reduction.

• 한국음향학회지
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• 제19권5호
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• pp.71-78
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• 2000

Quickness and precision are the two most important requirements for an industrial scale used in production lines. In this paper, a new approach, "Mass-estimation algorithm by vibration-response measurement of dynamic balance", is presented to improve some of drawbacks in conventional scales. The system, consisted of velocity and displacement sensors, spring scale, analog-digital converter and microcomputer, is based on full utilization of dynamic mass measurement of velocity and displacement via microcomputer-assisted real time monitoring. The resulting system, when combined with appropriate mass estimation algorithm software, has shown its effectiveness in terms of two desirable characteristics required.

• 한국수산과학회지
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• 제32권4호
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• pp.466-469
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• 1999

전세계의 담수역에 널리 분포하는 Daphnia나 Moins와 같은 담수산 물벼룩은 잉어, 붕어, 금붕어와 같은 담수어의 종묘 생산과정에서 먹이 생물로서 널라 이용되고 있다. 그러나, 해산어의 종묘 생산 과정에서는 안정 배양, 대량 배양이 어렵다는 이유로 로티퍼나 알테미아 이외에 널리 이용되는 먹이 생물은 거의 없다. 이 연구에서는 해산 물벼룩보다는 비교적 배양이 용이한 기수산물벼룩 D. celebensis의 배양 용기의 크기가 안정배양에 미치는 영향을 검토하였다. 종 보존 배양 수준의 40ml 배양에서는 16일간의 배양 기간중 14일째에 최고 밀도가 3.416$\pm$0.396 ind./ml에 달하였다 1,500ml와 15,000ml의 준 대량 배양에서는 각각 배양 개시후 12일째와 21일 째에 14.2$\pm$2.122 ind./ml와 2.489$\pm$1.618 ind./ml의 최고 밀도가 관찰되었다. 그리고 실험 기간중 배양의 안정도를 평가하기 위하여 실시한 세가지 배양 수량간 상대적 개체군 증식 지수 (RPGI)의 비교 결과에서는 1,500ml의 배양 용기에서 가장 안정적인 증식양상을 보였다. 뿐만 아니라, 매일 수확 가능한 기수산 물벼룩 D. celebensis의 개체수를 계산한 결과에서도 (possible harvesting number/ind./ml/day) 1,500ml의 배양 용기에서 가장 높은 3.567$\pm$0.607ind./ml/day가 수확 가능하였다. 한때 필요성에 의하여 담수산 물벼룩을 해산어의 종묘생산 과정에서 먹이생물로 이용한 시기가 있었다. 그러나, 앞으로는 기수산 물벼룩을 해수에서 배양하여 해산 자치어의 먹이생물로 이용할 수 있을 것이다.

• 산업경영시스템학회지
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• 제43권2호
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• pp.137-145
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• 2020

Various elements of Fabrication (FAB), mass production of existing products, new product development and process improvement evaluation might increase the complexity of production process when products are produced at the same time. As a result, complex production operation makes it difficult to predict production capacity of facilities. In this environment, production forecasting is the basic information used for production plan, preventive maintenance, yield management, and new product development. In this paper, we tried to develop a multiple linear regression analysis model in order to improve the existing production capacity forecasting method, which is to estimate production capacity by using a simple trend analysis during short time periods. Specifically, we defined overall equipment effectiveness of facility as a performance measure to represent production capacity. Then, we considered the production capacities of interrelated facilities in the FAB production process during past several weeks as independent regression variables in order to reflect the impact of facility maintenance cycles and production sequences. By applying variable selection methods and selecting only some significant variables, we developed a multiple linear regression forecasting model. Through a numerical experiment, we showed the superiority of the proposed method by obtaining the mean residual error of 3.98%, and improving the previous one by 7.9%.

• Journal of Microbiology and Biotechnology
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• 제14권5호
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• pp.944-951
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• 2004

The influences of inoculum size, pH, and medium composition on mycelial growth and exopolysaccharides (EPS) production were investigated in shake flasks and in a bioreactor. The optimum inoculum size for both mycelial growth and EPS production was identified to be 10% (v/v) in shake flask cultures. The optimal initial pH for mycelial growth and EPS production in shake flask cultures were found to be 5.0 and 7.0, respectively. However, the optimal pH was 5.0 for both mycelial growth and EPS production in bioreactor cultures where the pH was regulated. The optimal mass ratio of the two major carbon sources, glucose to dextrin, was 1:4. The optimal mass ratio of the two major nitrogen sources, yeast extract to soy tone peptone, was 2:1. When 500 mg $1^{-1}$ of $MnSO_4-5H_2O$ was added to the bioreactor culture, both mycelial growth and EPS production were enhanced by approximately 10%. Under the optimized conditions, a mycelial biomass of 9.85 g $1^{-1}$ and an EPS concentration of 4.92 g $1^{-1}$ were obtained in 4 days.

• Journal of Microbiology and Biotechnology
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• 제12권1호
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• pp.1-7
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• 2002

The effects of DO and pH on the mass production of pullulan with high molecular weight and the morphology of A. pullulans ATCC 42023 were evaluated. A. pullulans showed a maximum production of pullulan (11.98 g/l) when the initial pH of the culture broth was 6.5 in a shake-flask culture. In a batch culture, the mixture of a yeast-like and mycelial cell forms was found at a pH of 4.5, and the maximum production of pullulan (13.31 g/l) was obtained. However, a high proportion of high molecular weight pullulan (M.W.>2,000,000) was produced at a pH of 6.5, with a yeast-like morphology. The maximum pullulan production yield ($51\%$) was obtained at a pH noncontrol (initial pH 6.5) and DO control (above $50\%$) condition. Pullulan degrading enzyme was activated when the pH of the broth was lower than 5.0 and the portion of low molecular weight pullulan was increased. The formation of a black pigment was observed at an initial stationary phase, at 40 h of fermentation. Therefore, the fermentation should be carried out in a pH noncontrol (initial pH of 6.5) and DO control (above $50\%$) condition, and should be harvested before reaching the stationary phase (around 40 h) for the production of high molecular weight pullulan.

• 식물조직배양학회지
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• 제21권2호
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• pp.77-84
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• 1994

꽃기린 현탁배양에 의한 화청소의 생산에 미치는 탄소원 의 역할을 규명하고 이들 배양세포를 생물반응기를 이용하여 대량배양을 시도하였으며 생성된 색소의 분리 및 동정을 행하였다. 세포의 생장은 3% sucrose농도에서 양호하였으나 단위세포무게당 색소함량은 sucrose의 농도가 3%에서 9%로 증가함에 따라 증진되었다. sucros는 배양 1일 후부터 glucose와 fructose로 분해되지 시작하며, 고농도로 공급된 sucrose는 배지의 삼투압제로 작용하여 색소의 형성을 촉진하였다. 생물반응기 배양의 경우, 기포발생형 생물반응 기가 세포의 손상을 방지하 양호한 생육상을 나타내어 적합하였고 접종농도를 증가시킴으로서 총 색소의 함량은 감소하였으나 배양기간이 1/2로 단축되었으며 색소의 1일 생산성도 증가되는 효과를 나타내었다. 기포발생형 생물반응기를 이용한 색소생산량은 2.2 mg/L/day를 나타내었다. 한편, 배양세포로부터 생성된 주된 화청소는 cyanidin-3-glucoside로 추정되었다.

• 한국가금학회지
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• 제27권3호
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• pp.243-254
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• 2000

The effect of supplemental microbial phytase and non - phytate phosphorus(NPP) levels on layer productivity and nutrient digestibility were conducted in 640 21 weeks - old HyLine brown layer for 12 weeks. Supplemented phytase levels were 0, 300, 500 and 1,000 DPU/kg diet. NPP levels were adjusted with tricalcium phosphate(TCP), which were 0(0.11% NPP), 0.5(0.20), 1.0(0.29) and 1.5%(0.38). ME, CP and Ca levels were maintained at 2,800㎉/kg diet, 16% and 3.5%, respectively. Egg production was increased with phytase compared to without phytase(P〈0.05). Increasement of egg production was higher latter of experimental period. Egg production was not different to phytase levels. Egg production in TCP levels were increased in above 0.5% compared to 0% TCP. Difference of egg production by TCP was higher after 6 week. Especially, egg production to supplemental phytase was higher in 0% TCP. Egg weight was not different to phytase and TCP levels. Egg mass was increased with phytase compared to without phytase, but not difference significantly. There was similar to phytase levels. Egg mass in TCP group was increased in TCP supplementation(P〈0.05). Feed intake was not different in phytase levels, and greater with increasing TCP levels(P〈0.05). Feed conversion was improved with phytase(P〈0.05), and not difference in TCP levels. All of nutrients digestibility tended to improve with phytase, P(P〈0.05), especially. There were not different among phytase levels. The effect of adding phytase was higher in low phosphorus diets compared normal levels. Eggshell breaking strength and eggshell thickness also improved in added phytase(P〈0.05). Tibial ash and P content were slightly increased with phytase, and Ca content also was higher(P〈0.05) compared without phytase. We concluded that supplemental phytase in low phosphorus diet was showed to increase laying performance, feed efficiency, nutrients digestibility, egg quality, and bone development. Phytase supplementation was able to compensate for low NPP diet. We also thought optimum phytase level is 300 DPU, and can decrease NPP supplementation adding phytase in later diet.