• 프린팅코리아
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• v.12 no.8
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• pp.58-59
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• 2013

인쇄사가 재정건전성을 유지하기 위해선 각 공정 모두 기준 이익을 확보해야 한다. 특히 프리프레스 공정은 프레스 공정에 비해 중요도가 간과돼 이익률이 떨어지는 경우가 많은데, 이에 대한 정확한 대응이 요구된다. 프리프레스 공정의 이익률을 높이기 위해서는 부가가치 높은 작업을 확대하고, 작업의 오류를 미연에 방지하며, 정확한 기준을 수립하는 것 등이 필요하다.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.898-899
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• 2011

2010년 미국 GM에서 개발한 쉐보레 볼트는 그 이전에 개발된 일본 도요타의 프리우스에 이어 선풍적 관심을 모으고 있다. 한국에서 개발 시험 출시한 Blue-one 전기자동차는 제주 실증 단지에서 그 성능이 시험되고 있다. 전력연구원에서 는 "그리드 연계형 전기차 충전인프라 개발" 과제를 통해, 충전 전력 요금을 현행 계시별 공급원가 수준에 기초하되, 전기차 고유의 충전부하 특성을 고려하여 경부하 시간대에 사용을 유도하는 방향으로 전기차 충전 전용 요금을 설계하였다. 이 전기차 충전인프라 전용요금을 사용하여, 전기차의 충전인프라 운영을 시뮬레이션 하였다. 본 논문에서는 전기차 충전인프라 개발 목적, 충전인프라 개발 방법, 충전인프라 개발 결과를 기술하였으며, 향후 연구방향 및 충전인프라 구축 방향에 대해 고찰해 보았다.

• Journal of the Korean Recycled Construction Resources Institute
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• v.9 no.2
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• pp.208-215
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• 2021

In this study, a customiz ed bridge system was developed for North Korea application. For the application of North Korea, the customized bridge system design, fabrication, and construction performance evaluation were performed using ultra-high performance concrete a compressive strength 120MPa or more and a direct tensile strength 7MPa or more. The comparison of the North Korean truck luggage load(30, 40, 55) and the Korean standard KL-510 load showed that cross-section increased as the load increased. Furthermore, a bridge with a span length of 30m was fabricated with ultra-high performance concrete for the construction performance evaluation. The evaluation of the load condition analysis was performed by a flexural test. The results showed that a bridge with a span length of 30m secured about 167% of sectional performance under initial cracking load conditions and about 134% of load bearing capacity under ultimate load conditions. As a result of economic analysis, the customized bridge system using ultra-high-performance concrete was less than about 11% of the upper construction cost compared to the steel composite girder bridge. Therefore, these results suggest that the price competitiveness can be secured when applying the ultra-high-performance concrete long-span bridge developed through this study.

• Journal of the Korean Solar Energy Society
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• v.38 no.6
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• pp.37-49
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• 2018

In this paper a new kind of unit-prefabricated building is shown. The unit-prefabricated buildings are made up living unit, energy unit, water unit. The design trend implemented the energy insulation, solar PV panels, energy storage system which are maintained for zero energy buildings. We made a prototype for zero energy flexible residential unit. The first step, we was evaluated the physical performance, insulation, airtightness. The second step, we was evaluated energy performance building to design heating and cooling system to combined PV system. As a results, the insulation performance wall was $0.18W/(m^2{\cdot}K)$. The results of air-tightness was 12.13 ACH@50 (1/h). The building energy demand ratings and solar energy generation has the possible to be ballanced.

• Electronics and Telecommunications Trends
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• v.31 no.2
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• pp.95-106
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• 2016

사물인터넷(Internet of Things: IoT)이란 모든 사물이 인터넷에 연결되어 상호 간에 직접 통신하는, 향후 정보통신의 미래 인프라 및 서비스이다. 이것이 필요한 이유는 초연결 사회에 기반을 둔 삶의 질 향상과 생산성 향상에 있으며, 최종적으로는 국가 자체의 인프라, 더 나아가서는 인류를 위한 중추 신경계를 이루기 때문에 무엇보다 중요하다. IoT는 셀룰러 이동통신 기반의 IoT와 비셀룰러기반의 IoT로 대분되어 오다가 두 분야의 융합이 이루어지고 있다. 그러나 IoT는 현재 거품 최고조기에 있으며, 아직까지 주목할 만한 큰 수익모델이 없는 상태이다. 그 이유는 사물인터넷 서비스 활성화에 가장 걸림돌이 되어온 보안문제, 배터리수명, 통신거리, IoT 디바이스를 포함한 솔루션 가격 그리고 월정료 문제가 여전히 존재하기 때문이다. 최근 이들 문제 해결을 목적으로, 대량의 IoT 디바이스를 필요로 하는 새로운 사물인터넷 커넥티비티에 대한 재정의, 표준화 및 솔루션 개발이 핫이슈이다. 본고에서는 셀룰라 및 비셀룰라 IoT기반의 Low Power Wide Area(LPWA), 즉 저전력 광역 IoT에 대한 시장, 기술 및 솔루션 비교 그리고 표준화 동향을 다룬다. 또한, 비셀룰라기반 즉 비면허대역과 프리밴드 활용을 통한 기술적 및 정책적 대응전략을 살펴본다.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.36 no.4
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• pp.251-257
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• 2023

This study entailed an investigation of a tensile stress measurement method for prestressed concrete (PSC) tendons by utilizing external magnetization. The target of this study are PS structures that have been constructed and in use. An optimal external magnetization based elasto-magnetic (EM) sensor was designed using finite element analysis considering various factors, such as coil arrangement and size, that could influence the PS tendons inside the PSC girder. The residual tensile stress resulting from the external magnetization of the girder was then determined. Further, theoretical verification was performed using the numerical and material data used in the finite element analysis for sensor design. The calculated values of strength of magnetization at the target location were matched with the finite element analysis results. Thus, the designed sensor and the feasibility of magnetizing the tendons inside the PSC I-girder using an EM sensor were validated.

• 한국IT서비스학회:학술대회논문집
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• 2005.05a
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• pp.199-204
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• 2005

유비쿼터스라는 단어는 이제 더 이상 생소한 단어가 아니게 되었다. 국가차원에서 주도적으로 유비쿼터스라는 분야를 개척하고 있으며, 이제 더 이상 SI업체들도 유비쿼터스를 배제하고는 성장하기 힘든 상황에 이르게 되었다. RFID만을 보더라도 대형 SI업체는 물론 중${\cdot}$소형 업체들도 경쟁적으로 뛰어들고 있다. 이러한 현상은 국내뿐만이 아니라 외국의 경우도 마찬가지로 IBM, HP, MS등 글로벌 업체들까지 뛰어들고 있는 상황이다. 일반적인 시민들이 가장 관심이 많은 것은 집이다. 내가 사는 곳에 관심이 많을수 뿐이 없는 것이 현실이며 현재 이러한 주거 공간에도 유비쿼터스가 파고 들고 있으며 유비쿼터스가 접목된 주거 공간이 이미 집을 장만하고자 하는 시민들의 선호 대상이 되고 있다. 현재 최첨단 인프라가 구축된 아파트들에 더 많은 프리미엄과 사람들이 몰리는 것을 증거로 들 수 있다. 여기서 유비쿼터스와 주거지역의 만남은 현재 계속 진행중인 상황이다. 그러나 아직은 제한적이고 소극적인 방향으로 진행되고 있다. 따라서 본고에서는 주거지역에 유비쿼터스를 도입하는 유비쿼터스 홈네트워크를 그려보고 유비쿼터스 홈네트워크 구현을 위한 SI기술들을 분석하고자 한다.

• Journal of Korea Port Economic Association
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• v.33 no.4
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• pp.1-16
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• 2017

The total container throughput of ASEAN is expected to increase continuously with economic development. However, ASEAN port infrastructure is insufficient to handle the increasing trade volume. According to the World Economic Forum, ASEAN ports except Singapore and Malaysia are ranked in low. Participation in ASEAN port development projects can lead an increase in trade efficiency with S. Korea by improving the port infrastructure of ASEAN countries. In addition, the S. Korean port-related industry can be energized through entering ASEAN port development projects. This study, which measures the efficiency of ASEAN ports, can be used as a basic guideline for the development and the planning of the ports. This study used Data Envelopment Analysis(DEA) and Shannon's Entropy model together to measure ASEAN ports' efficiency. After measuring each DEA (CCR, I-BCC, O-BCC, SBM) weight, the efficiency of ASEAN ports is measured as reflecting each DEA weight. As a result, the ports of Singapore and Malaysia, the major ports in the world, have the highest efficiency. Further, Vietnamese ports need to raise efficiency along with increasing container throughput. Leam Chabang (Thailand), Ho Chi Minh City (Vietnam), and Tanjung Priok (Indonesia) exhibit a negative correlation between container throughput and efficiency; therefore, the ports need to improve so as to maintain competitiveness. Lastly, Cambodia, Myanmar, and Brunei, which do not have active economic development, need to improve their ports for economic development.

• Journal of KIISE:Information Networking
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• v.36 no.5
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• pp.405-412
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• 2009

Mobile ad hoc networks (MANETs) allow mobile nodes to communicate among themselves via wireless multiple hops without the help of the wired infrastructure. In the MANET, it is required not only a route setup mechanism that makes nodes not within each other's transmission range communicate but also mechanism in order for a node to auto-configure a unique address. In this paper, we propose an address auto-configuration mechanism when MANET is connected to the Internet via several Internet Gateways and all gateways advertise the same network prefix. By using the proposed mechanism, once a node configures an Internet topologically correct and globally unique IP address, then the node can utilize the configured address even though the node moves within the MANET. Through the simulations, we analyze the performance of our proposed mechanism and, from the simulation results, we show that out proposed mechanism outperforms the existing mechanism.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
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• v.18 no.5
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• pp.1-16
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• 2023

Due to imbalances in supply and demand within the labor market, start-ups have emerged as crucial players in the generation of high-quality employment opportunities, particularly in stagnant job markets. In response to this trend, governments are allocating substantial financial and human resources to initiatives that support start-up development. This has led to an increasing rate of engagement in start-up ventures across diverse age groups, not limited to younger individuals. Start-ups are enterprises focused on the commercialization of innovative ideas with the aim of achieving profitability in the marketplace. Research concerning the successful market integration of new products and the attainment of sustainable growth is pivotal. Such research is instrumental not only for the success of start-ups but also for realizing the broader social functions and contributions that these enterprises can offer. Previous research has often examined new product market-entry strategies, often referred to as new product marketing, particularly for large companies and SMEs. However, there is a gap in studies focusing on prototype marketing strategies specific to start-ups. Thus, this study aims to examine the impact of Pre-announcing marketing strategies on the market attention garnered by start-ups with low recognition and limited infrastructure, and how such attention contributes to their sustainable growth. Specifically, the study aims to uncover the causal relationship between information attributes like relevance, vividness, and novelty in building customer relationships, and their impact on purchase intentions influenced by performance expectations and hedonic motivations. In terms of Pre-announcing information attributes, relevance, vividness, and novelty positively influence performance expectations and hedonic motivations as outlined in the extended Unified Theory of Acceptance and Use of Technology (UTAUT2). These factors, in turn, positively impact the purchase intention for pre-announced new products from start-ups. These findings are expected to provide both theory and practical insights into the factors influencing market entry through the use of Pre-announcing marketing strategies for start-up new products.