• The Journal of the Korea institute of electronic communication sciences
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• v.18 no.1
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• pp.149-156
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• 2023

This research tried to develop an ESS electricity trading system linked with blockchain for energy participation consumers. For the purpose of publishing renewable energy ESS power amount and demand information, we will build a smart contract system on the blockchain DB, utilize the blockchain DB data of energy prosumers and consumers, and expand the power trading market flexibly. to provide realistic solutions. Therefore, the main contents of the development of the ESS power trading system linked to the blockchain are cloud-based web construction for ESS management, coin issuance and exchange registration for activating the blockchain, and to reflect the blockchain technology, building a blockchain database for collecting and supplying ESS-based production demand data, selecting a blockchain-based platform and building a foundation, and creating a smart contract, etc.

• Convergence Security Journal
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• v.22 no.1
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• pp.71-79
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• 2022

The smart grid system has emerged to maximize energy efficiency through real-time information exchange between power providers and consumers by combining information technology and power supply systems. The authentication schemes using blockchain in a smart grid system have been proposed, which utilize an edge server's architecture to collect and store electric power-related information and process data between a central cloud server and smart grid-IoT devices. Although authentication schemes are being proposed to enhance security in the smart grid environment, many vulnerabilities are still reported. This paper presents a new mutual authentication scheme to guarantee users' privacy and anonymity in a smart grid based on edge computing using blockchain. In the proposed scheme, we use the smart contract for the key management's efficiency, such as updating and discarding key materials. Finally, we prove that the proposed scheme not only securely establishes a session key between the smart grid-IoT device of the user and the edge server but also guarantees anonymity.

• Proceedings of the KIEE Conference
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• 2004.07c
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• pp.2111-2113
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• 2004

대형 조물은 안전관리 시스템의 법제화로 스트레인 게이지, 가속도 센서 등을 이용하여 상시 관리를 의무화 하고 있다. 상시 계측을 위해 유선 센서의 경우 데이터 전송의 신뢰성은 있지만 선로 결선의 문제점 때문에 무선 센서의 적용이 요구된다. 하지만 무선 센서의 경우, 전원공급의 문제를 갖고 있어 장차이 어려운 실정이다. 본 연구에서는 압전체를 이용하여 무선 센서의 전원 공을 위한 에너지 변환 시스템을 제안하였다. 이 시스템은 구조물 내부의 진동을 전기 에너지로 변환, Capacitor에 저장 후, 데이터 전송을 위해 일시에 방출하는 구조이다. 20m의 무선 데이터 통신을 위해 2.43mJ(5V*49mA*10ms)의 전력량이 필요한데, 모의 교량 모델에 시스템을 적용한 결과 2분 30초 동안의 진동 에너지가 2.8mJ의 전기 에너지로 저장되었다. 이 실험 결과를 토대로 무선 센서를 이용한 상시 모니터링이 가능함을 예상할 수 있다.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2000.04a
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• pp.477-480
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• 2000

오늘날 많은 제조업체 또는 물류업체는 물류의 효과적 수행을 위해 물류센터를 운영하고 있으며, 물류센터의 효과적 이용을 통한 물류문제 해결은 기업운영에 있어서 주요 해결과제 가운데 하나로 자리잡게 되었다. 이러한 물류센터를 운영하고 관리함에 있어서 물류센터의 전략적 의사결정과 투자계획의 수립을 위해 물류센터의 수행도 측정을 통한 정량적인 평가가 절대적으로 필요하게 되었다. 그러나 현재 기업물류활동을 평가하기 위한 여러가지 물류활동 측정지표들이 제시되고 있으나 물류센터들의 수행도 측정을 위해 체계적으로 정의화되고, 표준적으로 사용되는 유력한 정량적 평가방법이 아직 제시되어 있지 않다. 본 연구에서는 물류센터의 특성을 Cost(비용), Operation(설비운영). Quality(성과), Speed(속도), Flexibility(유연성), Safety(안전성)등 모두 여섯 가지로 구분하여 각각의 특성을 통해 물류센터를 정량적으로 평가한다. 이중 Safety(안전성)를 기본으로 삼고 나머지 주요인자들의 정량적 평가치 들을 통해 물류센터의 종합적인 수행도 평가 모델을 제시하였다. 물류센터의 운영평가는 궁극적인 공급체인관리망(SCM: Supply Chain Management)의 완성과 기업의 업무효율에 이바지하는 것이다.

• Journal of the Korean Society of Clothing and Textiles
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• v.30 no.12 s.159
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• pp.1697-1707
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• 2006

Relentless advances in information technology are constantly transforming market dynamics of the retail industry. RFID is an emerging innovative technology that can reduce labor costs, improve inventory control and increase sales by effective business processes. Apparel retailers need to recognize the benefits of RFID and identify critical success factors. By focusing on apparel retailers, this study attempts (1) to identify the reality of RFID associated with benefits; and (2) to prospect the implementation of RFID in apparel retailing. We conducted a focus group interview with selected six panels who were experts of retail industry in the United States to obtain data regarding RFID attributes. Content analysis was used to generate related excerpts and classify 31 attributes of RFID benefits from the meaningful 173 responses. For experience of RFID, retailers were familiar with RFID technology and expressed the belief that RFID basically would support an existing retail system for speed to markets. However, retailers addressed the level of experience with RFID technology that they were still in the early adoption stage among few innovative companies. The content analysis identified five dimensions of RFID benefits for apparel retailing: Visibility and Velocity, Revenue Enhancement, Customer Service, Security, and Employee Productivity. This result lends support to the belief that RFID has a significant potential to streamline supply chain management, store operation and customer service for apparel retailing. This study provides intellectual and managerial implications far practitioners and researchers by postulating the effective use of RFID in the apparel retail industry.

• Proceedings of the Korea Water Resources Association Conference
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• 2015.05a
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• pp.249-249
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• 2015

ASR(Aquifer Storage Recharge) 또는 ASTR(Aquifer Storage Transfer Recharge)과 같은 직접적인 지하수 인공함양기법은 대수층을 활용하여 수자원을 공급하고 관리하기 위한 적극적인 방안으로 고려될 수 있다. 이 중 ASTR 기법은 대규모 충적층이 발달한 강변 또는 하구에서 저류지 수생식물의 정화작용과 층적층의 물리/화학/생물학적 여과 기능을 활용하여 양질의 상수원수를 확보할 수 있는 기법이며, 수질이 나쁜 하천수를 직접 취수하여 정수처리하는 것에 비해 정수비용이 상대적으로 적게 들어 투자대비 경제적인 상수원수 확보기술이라 할 수 있다. 본 연구에서는 하구에 염수 대수층이 위치해 있다고 가정하였으며, 이러한 염수 대수층 내에 담수 주입 변화에 따른 지하 담수체의 거동을 4가지 시나리오에 따라 모의 및 분석을 통해 조사하였다. 염수 대수층 내에서 8개의 주입정과 1개의 양수정이 설치되어 있다고 가정하였으며, 주입정은 동심원 상에 등간격으로 위치해 있으며, 양수정은 동심원 중에 위치해 있다고 가정하였다. 본 연구에서 구성된 시나리오로 첫 번째는 주입정 8개 모두에서 동시에 주입되며, 1개의 양수정을 통해 양수되는 것이며, 두 번째는 7개의 주입정에 주입 그리고 1개의 주입정 폐쇄, 세 번째는 6개 주입정에 주입 및 양수정과 서로 마주보는 2개 주입정 폐쇄, 그리고 마지막으로 6개 주입정에 주입 및 서로 이웃한 2개 주입정 폐쇄이다.

• Journal of Aquaculture
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• v.18 no.4
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• pp.231-235
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• 2005

A 6-week feeding trial was conducted to determine optimum feeding frequency for growth of juvenile flounder Paralichthys. olivaceus during the summer season. Triplicate groups of fish (initial mean weight 3.7 g) were fed a extruded pellet with 5 feeding frequencies (one meal every 2 days, one meal a day, two meals a day, three meals a day and four meals a day) at $24.0\pm0.50^{\circ}C$ (mean$\pm$SD). Survival of fish fed one meal every 2 days was significantly (P<0.05) lower than that of the other groups. Weight gain, specific growth rate and daily feed intake increased with increasing feeding frequency (P<0.05). However, no significant differences were observed in weight gain, specific growth rate and daily feed intake of fish fed among two, three and four meals a day. feed efficiency and protein efficiency ratio were not affected by feeding frequency. Whole body contents of moisture, crude protein, crude lipid and ash were not significantly affected by feeding frequency. These results indicate that optimum feeding frequency is two meals a day for the optimum growth of juvenile flounder grown from 3.7 to 19.0 g under the experimental conditions.

• Korea Trade Review
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• v.42 no.2
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• pp.319-344
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• 2017

The international standard certification evaluates the extend to which the supplier satisfies the international standard certification standards of the supplier of the product and the service, recognizes the quality assurance ability and reliability of the supplier, thereby resolving the international trade regulation that can occur to various fields and strengthening the network of the global partnership it is making an important contribution. Therefor, in this study, the survey was conducted on 153 companies of Korean import and export companies. The research method was empirically analyzed by the structural equation model. The results of the hypothesis test of this study are as follows. First, resource management factors among the international standard certification factors in the global trade supply chain integration had a positive effects on CRM satisfaction. Second, the measurement, analysis and improvement factors of international standard certification factors had a positive effects on CRM satisfaction. Third, CRM satisfaction has a positive effects on business performance. Through this study, it is concluded that the Korean import and export companies have an important role in improving the business performance of the global trade partners.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.21 no.4
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• pp.149-160
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• 2011

Smart Grid is the next-generation intelligent power grid that maximizes energy efficiency with the convergence of IT technologies and the existing power grid. It enables consumers to check power rates in real time for active power consumption. It also enables suppliers to measure their expected power generation load, which stabilizes the operation of the power system. However, there are high possibility that various kinds of security threats such as data exposure, data theft, and privacy invasion may occur in interactive communication with intelligent devices. Therefore, to establish a secure environment for responding to such security threat with the smart grid, the key management technique, which is the core of the development of a security mechanism, is required. Using a hash chain, this paper suggests a group key management mechanism that is efficiently applicable to the smart grid environment with its hierarchical structure, and analyzes the security and efficiency of the suggested group key management mechanism.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.66 no.1
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• pp.87-96
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• 2021

Information and Communication Technology (ICT) remote soil moisture control system including soil sensing, automatic water supply chain, and remote alarming system was established on reclaimed land and operated stably. The system was operated using river water around the reclaimed land without fertilizer. On applying this system to control soil moisture, the kenaf germination rate was improved up to two times. Kenaf biomass was 4,748 kg/10a and was higher than that of untreated soil moisture management. When the nutritious liquid fertilizer was used, kenaf yield reached 8,390 kg/10a, which was lower than 10,848 kg/10a of the non-reclaimed land treated with standard chemical fertilizers. As the soil moisture was managed stably through the ICT remote soil moisture control system, the quality of the kenaf crop was improved, resulting in a 7% increase in dry weight, and a 11.5% increase in plant hardness. The estimated kenaf yield was 5,039 kg/10a when 800 tonnes of water were supplied by the ICT remote soil moisture control system with the stream water around Saemangeum reclaimed land without chemical fertilizers and organic matter.