• 한국산업융합학회 논문집
• /
• 제12권2호
• /
• pp.85-90
• /
• 2009

The Toyota production system (TPS) developed by Toyota corporation is a management principle and production model to improve values added through elimination of waste. Since the oil shock in 1970s, the TPS has drawn the worldwide attentions as a main factor of competitiveness of Japanese manufacturing system and has been studied and implemented in many countries regardless of size and types of industry. For the correspondence to various customer's requirement, it is required to establish on time delivery procedure and to shorten lead time. Therefore it intended to establish TPS which is adopted to 7 losses reduction and JIT(Just in Time). In this paper, the automatic production line for color TV manufacturing by TPS was developed and proved to push up two times of productivity, to reduce the 25 workers at a time, and to widen the flexibility of manufacturing from 14" to 25" TV.

• 한국정밀공학회지
• /
• 제13권3호
• /
• pp.26-30
• /
• 1996

The successful development of the automobile industry in Korea is the firstfruit of the epochmaking automobile policy in 1973: Top-Down mass production of Korean model cars. In Top-Down system, indigenous model, which is the most important and difficult part of the automobile industry, is devised first, followed by the mass production of the major parts, such as bodies, engines, etc. This system is in contrast to the prevailing Bottom-up system in the third-world, which assembles automobiles by gradually adding up simple domestic parts. The Government, faced with a vicious circle of depen- dence on assembly of foreign cars, high prices, small demand and low production, decided it was time to move to the mass production of the indigenous models. It was hoped that the efficiencies of low cost Korean models would be epochally improved by overcoming the sway of foreign models and by strengthening the production capabilities of the main parts. In contrast to these develop- ment planning, assembled vehicles numbered only 26,300 units in 1973. In the year of 1995, the total number of automobile production have already passed 2,534,000. As steady growth in worldwide demand is forecast, Korea will able to play a major role as an important automobile maker of the next century.

• 유통과학연구
• /
• 제20권9호
• /
• pp.39-46
• /
• 2022

Purpose: At the industrial sites of aviation enterprises there is a significant optimization of the main production processes through the use of advanced digital technologies. The most promising are the latest technologies of industrial Internet of Things, active use of big data and practical application of artificial intelligence in production. Research design, data and methodology:The process of creating a competitive product in the high-tech aviation sector is actively linked to the investment appeal of aircraft and helicopter construction products, which is built on the basis of reducing production and time costs through the creation of an effective digital system. Results: The aviation cluster of Rostec State Corporation is currently being transformed in a significant way. The leading enterprises of the Russian aviation industry are actively mastering cooperation schemes using integrated digital management principles and the widespread introduction of digital products from leading Russian vendors. Conclusions: Following the transition to electronic aircraft design technologies and modern materials in the production of aircraft, UAC continues to improve all production processes through robotization and optimization of technological processes, due to the introduction of aircraft assembly technology in accordance with digital models.

• Nuclear Engineering and Technology
• /
• 제55권5호
• /
• pp.1871-1877
• /
• 2023

The main goal of the coordinated project development of therapeutic radiopharmaceuticals of Y-90 and Re-188 is to exploit advancements in radionuclide production technology. Here, direct and indirect production methods with medium reactor and cyclotron are compared to evaluate derived neutron flux and production yield. First, nano-sized ¹⁸⁶W and ⁸⁹Y specimens are suspended in water in a quartz vial by FLUKA simulation. Then, the solution is irradiated for 4 days under 9E+14 n/cm2/s neutron flux of reactor. Also, a neutron activator including three layers-lead moderator, graphite reflector, and polyethylene absorbent- is simulated and tungsten target is irradiated by 60 MeV protons of cyclotron to generate induced neutrons for ¹⁸⁸W and ⁹⁰Sr production via neutron capture. As the neutron energy reduced, the flux gradually increased towards epithermal range to satisfy (n/2n,γ) reactions. The obtained specific activities at saturation were higher than the reported experimental values because the accumulated epithermal flux and nano-sized specimens influence the outcomes. The beta emitters, which are widely utilized in brachytherapy, appeal an alternative route to locally achieve a rational yield. Therefore, the proposed method via neutron activator may ascertain these broad requirements.

• Animal Bioscience
• /
• 제37권2_spc호
• /
• pp.360-369
• /
• 2024

Ruminal methane production functions as the main sink for metabolic hydrogen generated through rumen fermentation and is recognized as a considerable source of greenhouse gas emissions. Methane production is a complex trait affected by dry matter intake, feed composition, rumen microbiota and their fermentation, lactation stage, host genetics, and environmental factors. Various mitigation approaches have been proposed. Because individual ruminants exhibit different methane conversion efficiencies, the microbial characteristics of low-methane-emitting animals can be essential for successful rumen manipulation and environment-friendly methane mitigation. Several bacterial species, including Sharpea, uncharacterized Succinivibrionaceae, and certain Prevotella phylotypes have been listed as key players in low-methane-emitting sheep and cows. The functional characteristics of the unclassified bacteria remain unclear, as they are yet to be cultured. Here, we review ruminal methane production and mitigation strategies, focusing on rumen fermentation and the functional role of rumen microbiota, and describe the phylogenetic and physiological characteristics of a novel Prevotella species recently isolated from low methane-emitting and high propionate-producing cows. This review may help to provide a better understanding of the ruminal digestion process and rumen function to identify holistic and environmentally friendly methane mitigation approaches for sustainable ruminant production.

• 만화애니메이션 연구
• /
• 통권33호
• /
• pp.173-202
• /
• 2013

본 연구 기획개발(development) 단계에 대한 이론적 검토를 통해 한국의 애니메이션 산업 구조에 가장 적합한 제작과정의 초기 단계를 정립시키고자 한다. 그 중요성에 비해 잘 알려지지 않은 기획개발 단계는 애니메이션 제작을 하기 전 어떤 작품을 만들 것인가를 구상하는 단계로서 가장 초기 단계이자 동시에 가장 기초적인 부분이다. 이 단계는 작품의 주제가 결정되고, 제작을 위해 필요한 기초 준비가 이루어지는 단계로서, 애니메이션 제작 과정 중 프리 프로덕션(pre-production) 단계 이전에 설정된다. 기획개발 단계의 역할을 살펴보면 크게 두 가지 유목으로 정리될 수 있다. 하나는 프로젝트 콘텐츠 부분으로서 스토리와 직접적으로 연관되는 것들이다. 구체화된 아이디어를 가지고 제작에 필요한 지원을 받기 위한 활동에 들어갈 준비를 해야 하기 때문에 매우 중요하다. 다른 하나는 프로젝트 제작지원 혹은 사업 부분으로서 재정, 인사, 일정에 관한 부분이다. 이와 같은 업무를 수행해낼 역할과 권한을 가진 자는 바로 제작자(producer) 혹은 총괄제작자(executive producer)이다. 이들의 참여는 기획개발 단계에서도 가능한 빨리 참여하는 것이 중요하다. 구매예정자가 원하는 스타일과 내용을 작가와의 협력을 통해서 만들어내야 하고, 그러한 내용이 과연 애니메이션으로 적합한지를 초기에 판단, 결정해야 하기 때문이다. 기획개발 단계에 대한 연구는 부족하기 때문에 이론화된 모델과 함께 실제사례를 중심으로 한 다양한 관점에서의 연구가 지속되어야 한다.

• 만화애니메이션 연구
• /
• 통권12호
• /
• pp.56-72
• /
• 2007

본 연구에서는 클러스터로 지정된 춘천의 애니메이션 산업의 특징을 분석하였다. 내적으로는 다른 지역의 클러스터와 차별화하기 위해 정책수행기관의 역할을 변화시키고 공동제작을 강화함과 동시에 실질적인 콘텐츠 제작단지의 건립을 시도함으로서 자체적인 문화콘텐츠 산업을 발전시키려 하고 있다. 한편, 외적으로는 공동제작을 주로 해외와 시도하면서 이러한 연결을 단순한 제작의 네트워크가 아닌 산업과 시장이 유기적으로 연결된 하나의 블록을 형성하려 하고 있다. 지방자치제 이후 자체적인 클러스터 운영이 국내의 다른 클러스터의 모습이나 성격과는 차별화되면서 국제적으로도 자체적인 네트워크를 이루어가고 있다는 점에서 의의가 있다.

• Animal Bioscience
• /
• 제37권4호
• /
• pp.631-639
• /
• 2024

Objective: This study evaluates goat sperm motility in response to metabolic substrates and various inhibitors, aiming to assess the relative contribution of glycolysis and mitochondrial oxidation for sperm movement and adenosine triphosphate (ATP) production. Methods: In the present study, two main metabolic substrates; 0 to 0.5 mM glucose and 0 to 30 mM pyruvate were used to evaluate their contribution to sperm movements of goats. Using a 3-chloro-1,2-propanediol (3-MCPD), a specific inhibitor for glycolysis, and carbonyl cyanide 3-chlorophenylhydrazone as an inhibitor for oxidative phosphorylation, cellular mechanisms into ATP-generating pathways in relation to sperm movements and ATP production were observed. Data were analysed using one-way analysis of variance for multiple comparisons. Results: Sperm motility analysis showed that either glucose or pyruvate supported sperm movement during 0 to 30 min incubation. However, the supporting effects were abolished by the addition of a glycolysis inhibitor or mitochondrial uncoupler, concomitant with a significant decrease in ATP production. Although oxidative phosphorylation produces larger ATP concentrations than those from glycolysis, sperm progressivity in relation to these two metabolic pathways is comparable. Conclusion: Based on the present study, we suggest that goat sperm use glucose and pyruvate to generate cellular energy through glycolysis and mitochondrial respiration pathways to maintain sperm movement.

• 한국산학기술학회논문지
• /
• 제16권3호
• /
• pp.1715-1724
• /
• 2015

이 연구는 정부의 목재산업진흥 종합계획에 기초하여 장기적인 산림의 영급구조 변화와 국내재 공급 가능성에 대해 살펴보았다. 목재는 주벌과 수종갱신, 피해지 벌채, 솎아베기 등을 통하여서만 공급된다고 가정하였다. 영급별 면적의 동태적인 변화를 추정하기 위하여 코호트 관계식을 이용하였다. 2010년 전체 시업지의 7.7%에 불과하던 6영급 면적이 크게 증가하여 2100년에는 약 73% 정도를 차지할 것으로 분석되었다. 반면 다른 영급의 면적은 5.3~5.6%의 분포를 나타낼 것으로 전망된다. 목재공급에 있어서는 주벌에 의한 생산이 93~95%를 차지할 것으로 예상된다. 2영급과 3영급의 면적에 좌우되는 솎아베기 생산량은 면적의 감소와 함께 점진적으로 줄어들 것으로 예상된다. 국내재 예상 공급을 선행연구 결과로 제시된 국내재 예상 수요와 비교하여 자급률을 계산한 결과 2050년에 83% 정도 될 것으로 예상된다.

• 한국수소및신에너지학회논문집
• /
• 제29권4호
• /
• pp.307-316
• /
• 2018

In this study, the failure mode and effect analysis (FMEA) of hydrogen production process by using the Thermococcus onnurineus NA1 was conducted and advanced methodology to compensate the weakness of previous FMEA methodology was applied. To bring out more quantitative and precise FMEA result for bio-hydrogen production process, fuzzy logic and potential loss cost estimated from ASPEN Capital Cost Estimator (ACCE) was introduced. Consequently, risk for releasing the flammable gases via internal leakage of steam tube which to control the operating temperature of main reactor was caution status in FMEA result without applying the fuzzification and ACCE. Moreover, probability of the steam tube plugging caused by solid property like medium was still caution status. As to apply the fuzzy logic and potential loss cost estimated from ACCE, a couple of caution status was unexpectedly upgraded to high dangerous status since the potential loss cost of steam tube for main reactor and decrease in product gases are higher than expected.