• Proceedings of the Korean Society of Computer Information Conference
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• 2023.07a
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• pp.91-92
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• 2023

근로자의 수를 최소화한 자동화 공장의 경우 전체 공장의 상태를 실시간으로 정확하게 확인하기 어려운 문제가 있다. 또한, 장비나 센서의 배치가 복잡하고 명칭만으로 이해하기 어려워 현장에 있지 않은 사람들은 해당 데이터의 의미나 문제 발생 여부를 판단하기 어렵다. 이 논문은 시·공간적 한계를 극복하고 공장의 상태를 한눈에 파악할 수 있는 실시간 공장 상태 정보 시각화 도구를 구현하여 상시적인 모니터링과 함께 이상 상태 발생 시 빠른 대처가 가능하도록 하였다. 이 도구는 반응형 웹 기반으로 개발하여 모바일 환경에서도 동일하게 작동하기 때문에 범용성 있는 스마트 팩토리 구축 시스템의 일부로 활용할 수 있다.

• Proceedings of the Korea Information Processing Society Conference
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• 2024.05a
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• pp.392-394
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• 2024

OT와 IT가 접목된 스마트공장은 외부망과의 접점이 증가함에 따라 많은 공격자들의 타깃이 되고 있다. 특히, 스마트공장의 가장 많은 공격 경로인 IIoT 기기는 제조 설비에 대한 제어권을 가짐에 따라 작업자의 안전과 생산성에 직접적인 영향을 미쳐 보안 위협 발생 시에 위험도가 높다. 따라서, 스마트공장에서 IIoT를 안전하게 운용하기 위한 보안 표준 마련이 필요하다. 본 논문에서는 주요 국제표준화 기구 및 단체인 IEC, IIC, ITU-T의 표준 문서를 분석함으로써 IIoT 관점에서 스마트공장 보안을 위해 수행되고 있는 국제 표준화 동향을 분석한다.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 1996.10a
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• pp.5-8
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• 1996

혼류 생산은 동시에 여러 모델의 제품들이 조립, 생산되는 환경에서 적용되는 생산방법이다. 본 연구에서 대상으로 하고 있는 공장도 혼류 생산 방법을 이용하여 다양한 모델의 냉장고들을 생산하고 있다. 대상 공장에서는 기준 생산 계획을 수립하는 시스템이 구축되어 있기 때문에, 수립된 기준 생산 계획에 따라 공장 상황에 맞는 세부 생산 계획을 수립하고, 생산이 수립된 계획에 따라 진행되는지를 모니터링하는 시스템이 요구되었다. 적용 대상이 되는 공장의 구조는 세 개의 조립 주 라인이 있고, 주 라인들에 부품을 공급하는 두 개의 하부 라인들이 있다. 또한, 각 주 라인에는 해당 주 라인에 부품을 공급하기 위한 세 개의 단위 작업장이 속해 있다. 하부 라인과 단위 작업장은 부품들을 batch 형태로 생산하고, 주 라인에서 생산되는 제품의 종류에 따라 부품들을 주 라인에 공급한다. 본 연구에서 개발한 시스템은 기준 생산 계획 시스템에서 보내오는 생산 주문에 대해 제품을 조립할 주 라인과 생산의 시작시점을 결정하고, 결정된 계획에 따라 주 라인에서 생산을 시작하기 전에 부품들이 적절히 공급될수 있도록 하부 라인과 단위 작업장에서의 batch 생산 계획을 수립한다. 또, 계획된대로 주문을 진행시키기 위해 생산을 통제하고, 생산 중에 이상 상황이 발생하였을 때는 재계획을 수립한다. 본 연구에서 개발한 시스템은 대상 공장에 적용되어 효과적으로 역할을 수행하고 있다.

• Journal of Korea Technology Innovation Society
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• v.14 no.4
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• pp.983-999
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• 2011

This research focused on the strategy consulting of the 'Vertical Farm' for the blue ocean of Gyeonggi agricultural industry. The study was performed based on both theoretical study and related qualitative study approaches. particularly, 'scenario planning' as a foresight method was used for the strategy formulation of the Vertical Farm. The major determinants for the success of the formation of the Vertical Farm can be summarized as follows; the enhancement of research capability and the Relational Capability of the research institutions. In terms of the needs of times, this study regarding the strategy for the formation of the Vertical Farm is anticipated to be a good reference for the R&D organizations and technology cluster participants in coming years.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.16 no.10
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• pp.992-1000
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• 1991

At present, using different method, in the view of point of that factory to the rising of the productivity, they try to rise productivity by factory automation. First, it is the automation of each unit process. In out country, in the case of a few developed factory. they are realized by line automation. The majority factories are established by automation device of unit process. But, as the established devices, it must be connect between unit processes or mutual assistance and offical automation in order to raise up productivity highly. In this paper, process inspection control system is installed by each unit process automation and connect main computer with them. So, we try to rise high productivity using stochastic process and supervision function.

• Journal of Chest Surgery
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• v.29 no.12
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• pp.1392-1397
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• 1996

Over the past two years the free jejunal transfer have been used in 7 consecutive patients to restore alimentary tract continuity artier the resection of esophagus. Six patients had squamous cell carcinomas and one had esophageal stricture . The patients underwent partial esophagectomy with modified radicAl neck dissection or mediastinal Iymph node dissection. The microvascular anastomosis was performed to the neck vessels in 4 patients and to the in ercostal vessels in 3 patients. Postoperative complications were graft necrosis in one patient, and a temporary anastomotic leakage with spontaneous closure in one patient. Reconstruction of the esophagus was successful in 6 of 7 patients. We emphasize that esophagectomy followed by transplantation of a free jejunal transfer is suitable for esophageal carcinoma or intractable esophageal stricture, and involvement of the midesophagus is not a contraindication to the use of the free Jejunal transfer.

• Korean Journal of Environmental Agriculture
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• v.16 no.2
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• pp.161-165
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• 1997

This experiment were carried out to clarify the effects of several factory wastes on the emergence and seedling growth of five crop species, rice, Chinese cabbage, melon, and tomato. Wastes of three factories treated by several concentrations on the soil in which crop were seeded. In rice seedling experiments, the rice seedlings were treated with factory wastes hydroponically. Factory wastes used in the experiment were obtained from leather, phenol resin, and dye factory. The growth of rice seedlings was inhibited by each factory wastes, but the dry weight of rice seedling was increased by the low concentration below 1/16 dilution of leather factory waste. During 15 days, dry matter accumulation of rice seedlings treated with undiluted factory wastes decreased to 46.0, 51.4, -5.4% of control by treating wastes of phenol resin, leather, and dye factory respectively. The injury of crops by leather factory waste was severe in tomato but slight in barley. Waste of phenol resin factory affects highly both on Chinese cabbage and on melon. When dye factory waste was treated on each crop, all plants died in the treatments of waste solution which diluted to 1/8 of original waste. Tomato and melon were most sensitive crop species to the waste of dye factory. Although the responses of crops to each factory waste were various, the degree of injuries were more higher in vegetables than cereal crops.

• Journal of Science and Technology Studies
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• v.18 no.2
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• pp.269-306
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• 2018

Through this study, it is aimed to derive the policy direction considering the characteristics of the present Smart Factory, the industrial condition of Pohang area, and the promotion field. Secondly, the questionnaire data of the regional enterprises will prepare for the improvement of the industrial structure and the implications for efficiency, and preparation for regional preparation and industrial changes in preparation for the next generation of production revolution. The construction of Smart Factory in Pohang can be divided into two major directions. First, it is analyzed that smart factory pilot projects are highly needed, focusing on competitive medical precision manufacturing field among the SMEs in the region, primary metal and nonmetal manufacturing industries, and other machinery fields. In addition, local SMEs are willing to introduce smart factories for reasons of quality improvement and cost reduction, and it is confirmed that they will actively promote employee training and expertise if they can upgrade continuously.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.31 no.5
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• pp.1001-1010
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• 2021

Smart factories are complex systems which combine latest information technology (IT) with operation technology (OT). A smart factory aims to provide manufacturing capacity improvement, customized production, and resource reduction with these complex technologies. Although the smart factory is able to increase the efficiency through the technologies, the security level of the whole factory is low due to the vulnerability transfer from IT. In addition, the response and restoration of the business continuity plan are insufficient in case of damage due to the absence of factory security experts. The cope with the such problems, we propose an information security practice content for analyzing the damage by generating ransomware attacks in a digital twin-based smart factory similar to the real world. In our information security content, we introduce our conversion technique of physical devices into virtual machines or simulation models to build a practical environment for the digital twin. This content generates two types of the ransomware attacks according to a defined scenario in the digital twin. When the two generated attacks are successfully completed, at least 8 and 5 of the 23 virtual elements are take damage, respectively. Thus, our proposed content directly identifies the damage caused by the generation of two types of ransomware in the virtual world' smart factory.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.9
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• pp.182-187
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• 2019

With the transition to the era of the Fourth Industrial Revolution, movements of overall change, including technology, society and culture, are becoming increasingly diverse. Among these, even the manufacturing industry, which can be regarded as Korea's leading core industry, is also seeing great changes centered on smart factories. Expert analyses and corporate opinions suggest that smart factories are needed to be competitive in the manufacturing sector. In this study, the impact of small and medium manufacturers' awareness regarding smart factories was analyzed through a survey. The results showed that the need for smart plant construction and the degree of awareness regarding this was very high. In a survey of the planned or implemented level, more companies were expected to deploy, implement, and reduce instruments than those that did not have a plan to build smart factories. The main difficulties involved in deployment were funding problems and the results of the preliminary review phase were derived in order to successfully build a smart factory. Therefore, financial support was most needed to build smart factories, and a need to upgrade the support amount, match it with suppliers for a preliminary review and expand consulting was found.