• Journal of the Korean Recycled Construction Resources Institute
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• v.11 no.3
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• pp.226-233
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• 2023

In this study, two phases were conducted to investigate the direct injection of gaseous CO₂ into cement mortar. The aim was to advance carbon capture, utilization, and storage (CCUS) technology by harnessing industrial waste CO₂ from the domestic ready-mixed concrete industry. In the first phase, the factors influencing the physical properties of cement mortar when using gaseous CO₂ were identified. This included a review of materials to achieve physical properties comparable to a reference formulation. As a result of this phase, it was confirmed that traditional approaches, such as adjusting the water-to-cement ratio, had limitations in achieving the desired physical properties. Consequently, the second phase focused on the optimization of CO₂-injected mortar. This involved studying the CO₂ application and mixing method for cement mortar. Changes in properties were observed when gaseous CO₂ was injected into the mortar. The optimal injection quantity and time to enhance the compressive strength of mortar were determinded. As a result, this study indicated that an extra mixing time exceeding 120 seconds was necessary, compared to conventional mortar. The optimal CO₂ injection rate was identified as 0.1 to 0.2 % by weight of cement, taking both flowability and compressive strength performance into account. Increasing the CO₂ injection time did not further enhance strength. For this approach to be employed as a CCUS technology, additional studies are required, including a microstructural analysis evaluating the amount of immobilized CO₂.

• Journal of Convergence for Information Technology
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• v.11 no.9
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• pp.94-108
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• 2021

This study is to identify the internal and external factors of a company that can affect the rate of change in the inventory turnover ratio. In addition, by appropriately managing or responding to these factors, changes in the inventory turnover ratio do not occur abruptly, so that the company's business and financial performance can be improved. To confirm this, factors such as gross profit margin, cash flow volatility, advertising expenses, inflation, exchange rate rise, and leading economic index were selected, and these factors were predicted to affect the change rate of inventory turnover. Data of 85,878 companies were obtained from domestic securities listings, KOSDAQ listings, and externally audited companies, and multiple regression analysis was performed using the data. Gross profit margin and cash flow volatility have a significant positive (+) effect, advertising expenses have a negative (-) significant effect, and inflation and exchange rate rises have a negative (-) significant effect. As an influence, the leading economic index was tested to have a significant positive (+) effect. Through this, it is suggested that manufacturing companies can improve their business performance and achieve operational efficiency by well understanding and appropriately managing factors that can affect the change rate of inventory turnover.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.2
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• pp.370-379
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• 2018

The Korean government announced plans for the International Science Business Belt as a spatial area for promoting the linkage between scientific knowledge and commercialization in 2009. R&D and entrepreneurial activities are essential for the success of the International Science Business Belt. In particular, prioritizing the types of businesses is critical at the cluster establishment stage in that this largely affects the features and development of clusters comprising the International Science Business Belt. This research aims to predict the entry and growth of firms that specialize in four industrial clusters, including Big Science Cluster, Frontier Cluster, ICT Cluster, and Bio-Healthcare Cluster. For this purpose, we employ the Swann & Prevezer's industrial clustering model to identify sectors that affect the establishment and growth of industrial clusters in the International Science Business Belt, focusing on ICT, Bio-Healthcare and Frontier clusters. Data was collected from the 2014 Korean Innovation Survey (KIS) and University Alimi for the ICT cluster, 2014 National Bio Industry Survey and University Alimi for the Bio-Healthcare Cluster, and the 2015 National Nano Convergent Industry Survey and Annual Report of Nano Technology for the Frontier cluster. Empirical results show that the ICT service sector, bio process/equipment sector, and Nano electronic sector promote clustering in other sectors. Based on the analysis results, we discuss several policy implications and strategies that can attract relevant firms for the development of industrial clusters.

• The Journal of the Korea institute of electronic communication sciences
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• v.10 no.1
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• pp.55-64
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• 2015

Wind turbine market is showed height growth rate of about 30% for year, and is increasingly growing. Total rate of domestic wind turbine installation is showing share of 0.2% of the global market that is 380MW. However, wind turbine installed in domestic are foreign product more than 90%. Similarly, Datalogger of pretest system for ocean wind turbine plant installation has been leaked huge cost to abroad by mostly abroad company product. In this paper, we proposed pretest weather resource measurement system for efficiency and investment cost cutting of wind turbine construction work. Preset weather resource measurement system is ocean weather resource measurement datalogger based on wireless communication(wifi) that have consist of hardware and software(wind rose) that is able to monitoring as datalogger of wireless bridge and battery state, wind direction, wind speed, temperature, humidity, radiation around weather tower and is able to analysis of measured data.

• Journal of Advanced Navigation Technology
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• v.24 no.6
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• pp.458-464
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• 2020

Drones are being spreaded for the purposes such as construction, logistics, scientific research, recording, toy and so on. However, anti-drone related technologies which make the opposite drones neutralized are also widely being researched and developed because some drones are being used for crime or terror. The range of anti-drone related technologies can be divided into detection, identification and neutralization. The drone neutralization methods are divided into Soft-kill one which blocks the detected drones using jamming and Hard-kill one which destroys the detected ones physically. In this paper, Google and Naver domestic news articles related to anti-drone were gathered. Analyzing the domestic news articles, 8 of related technologies using RF, GNSS, Radar and so on were found. Regarding as this, the general features and usage status of those technologies were described and those on anti-drone for each company and agency were gathered and analyzed.

• Journal of the Korea Institute of Building Construction
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• v.22 no.5
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• pp.473-483
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• 2022

BIM(Building Information Modeling) is a technology that can manage information throughout the entire life cycle of the construction industry and serves as a platform for improving productivity and integrating the entire construction industry. Currently, BIM is actively applied in developed countries, and its use at various overseas construction sites is increasing This is unclear. due to air shortening and budget savings. However, there is still a lack of institutional basis and technical limitations in the domestic construction sector, which have led to the lack of utilization of BIM. Various activation measures and institutional frameworks will need to be established for the early establishment of these productive BIMs in Korea. Therefore, as part of the research for the domestic settlement and revitalization of BIM, this study derived a number of key factors necessary for the development of the construction industry through brainstorming and expert surveys using AHP techniques and analyzed the relative importance of each factor. In addition, prior surveys by a group of experts resulted in 1, 3 items in level, 2, 9 items in level, and 3, 27 items in level, and priorities analysis was performed through pairwise comparisons. As a result of the AHP analysis, it was found that the relative importance weight of policy aspects was highest in level 1, and the policy factors in level 2 and the cost-based and incentive system introduction factors were considered most important in level 3. These findings show that the importance of the policy guidance or institutions underlying the activation of BIM rather than research and development or corporate innovation is relatively high, and that the preparation of policy plans by public institutions should be the first priority. Therefore, it is considered that the development of a policy system or guideline must be prioritized before it can be advanced to the next activation stage. The use of BIM technologies will not only contribute to improving the productivity of the construction industry, but also to the overall development of the industry and the growth of the construction industry. It is expected that the results of this study can provide as useful information when establishing policies for activating BIM in central government, relevant local governments, and related public institutions.

• JOURNAL OF ELECTRICAL WORLD
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• s.259
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• pp.70-77
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• 1998

미쓰비시전기는 제3세대 16비트 D램을 비롯한 0.4$\mu$m이하의 디자인룰을 갖는 ULSI를 대상으로, 직경 200mm웨이퍼 프로세스기술을 포함한 제조기술을 개발하여, 일본 국내, 대만, 독일에 양산공장을 전개하였다. 생산성이 우수한 디바이스/프로세스기술을 기반으로 저비용의 청정실 건설, 급수 등을 포함한 동력설비, 공장 자동화(FA), 컴퓨터제어식 제조공정(CIM), 북이단지구에있는 미쓰비시전기의 반도ㅔ개발거점과 각 공장간을 맺는 정보네트워크, 나아가 제조장치에 대한 철저한 저발진화와 결함관리를 위해 동사의 기술을 결집하여 생산성이 매우 높은 반도체양산공장을 글로벌하게 전개하였다. 우선 태본공장 최첨단 반도체라인(KD동)을 아주 짧은 기간에 가동시키는 소위 ''수직기동''을 실현하였다. 다음에 태본공장 KD동을 ''마더(Mother)공장''으로 하여 그대로 기술이전하는 ''Copy Exactly''라는 방법으로 이들 기술을 세계적으로 전개한 결과 대만에 있는 합병회사인 PS(Powerchip Semiconductor corporation)와 독일에 있는 생산회사 MSE(Mitsubishi Semiconducter Europe, GmbH)에서도 최첨단 반도체공장의 수직기동에 성공하였다. 이 공장은 0.25$\mu$m이후의 제품에도 대응가능하며 태본공장 KD동은 64M비트 D램으로 제품을 전환해가고 있다. 그렇게 하여 이들 공장과 개발거점을 네트워크호하여 다국적 기업에 걸맞는 세계적인 ULSI의 양산체제를 구축하였다.

• Journal of the KSME
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• v.34 no.8
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• pp.617-625
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• 1994

최근에 매립에 의한 도시 쓰레기 처리방법이 한계에 도달해감에 따라 이를 좀더 감량화하고 안 정적으로 처리할 수 있는 소각처리기술의 중요성이 더욱 부각되고 있다. 정부에서도 2001년까지 국내 생활쓰레기의 25%를 소각 처리하는 것을 목표로 투자 계획을 세워놓고 있으며 이를 달 성하기 위해서는 무엇보다도 소각기술 및 소각 플랜트 기술의 자립이 급선무이다. 현재 우리나 라의 소각로 기술은 초보적인 단계에 머물러 있으며, 그 동안 대부분의 소각로를 외국 기업으 로부터의 기술 도입을 통하여 건설하여 왔다. 이와 같은 방법은 기술적으로나 경제적으로 많은 불이익이 있으며 특히 소각로 설계 기술의 자립과 국산화라는 근본적인 목표 달성이 지연되는 문제가 있다. 이러한 기술상의 한계성을 극복하기 위해서는 무었보다도 선진 원본기술에 대한 심도있는 분석 연구와 정부 및 산.학.연간의 협조에 의한 연구 개발노력과 투자가 지속되어야 한다. 또한 소각로의 안전성과 신뢰성향상을 위한 꾸준한 기술개발이 이루어져야 하며 지역 주 민들에 대한 적극적인 홍보를 통하여 현재 문제가 되고 있는 소각로 기피현상을 조속히 타개해야 할 것이다.

• Journal of the KSME
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• v.23 no.2
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• pp.72-75
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• 1983

(1)국산화의 득실 이러한 과감한 정제기기의 국산화는 정유업계에서 볼 때 저렴한 가격과 보다 빠른 납기로 인한 건설공기단축은 초기투자비를 경감시키고 고가의 예비품확보의 불필요로 인한 운전경비를 경감케 하는 이점은 있으나, 기술 및 제작경험의 부족과 재질불량등으로 인한 국산기기의 잦은 고장과 짧은 기기수명은 오히려 기업이윤에 역효과를 초래하며 안전면에도 문제점이 있다. 국가적 견 지에서 정제기기의 국산화는 외화절감으로 인한 대외경쟁력 강화와 경기부양, 중화학 플렌트 기 술개발 등 선진공업국 대열로 향한 국가경제개발의 필수적 과제라 하겠다. (2) 정제기기 국산화에 대한 정부지원의 필요 우리나라 기계공업기술이 200년의 역사를 가진 선진공업국의 정제기기기술에 비하면 낙후된 것은 사실이므로 전문제조업체에서 꼭 필요한 분야는 기술을 도입할 수 있도록 정부가 정책적으로 유도하고 지원하여야 할 것이며 산업기계의 국산화에 문제가 되는 특수소재분야의 개발에도 정 부차원에서 계열전문업체를 육성하여야 할 것이다. 자금지원면에서 플랜트국산화 자금을 극대 화하고 외자차관보다 외화차관로 지향하여 국산기기제작을 권장해야 할 것이다. (3) 정유기기 국산화의 전망 제조업체는 성실히 기술개발에 전념하고 품질관리에 철저를 기하여 정성껏 제작한다면 외상에 못지않는 정제기기 생산이 가능할 것이며 국내정유 및 석유화학설비의 80%까지 국산화는 무난할 것으로 사료된다.

• 한국벤처창업학회:학술대회논문집
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• 2023.04a
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• pp.141-144
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• 2023

우리나라 자동차산업에서의 정비서비스업은 After Market을 대표하는 중요한 업종이며, 상용트럭 또한 국가 물류와 건설현장에서 가장 큰 비중을 차지하고 있는 중요한 부문임에는 틀림이 없다. 본 논문의 목적은 상용트럭 딜러기업의 정비서비스분야에서 물리적 환경과 내부마케팅이 직원만족과 조직성과에 미치는 영향에 대한 영향력을 알아보는 것이다. 본 연구에서는 국내 및 수입 상용트럭 직영 및 딜러 종합정비업체 25개 직원들을 대상으로 하여 설문조사하고 실증 분석하였다. 주요한 연구결과는 다음과 같다. 첫째, 자동차 정비사업소의 물리적 환경은 직원만족에 긍정적 영향을 미치는 것으로 나타났다. 둘째, 내부마케팅은 직원만족에 긍정적 영향을 미치는 것으로 나타났다. 셋째, 직원만족은 조직성과에 유의한 정의 영향을 미치는 것으로 나타났다.