• Korean Journal of Agricultural Science
• /
• v.39 no.2
• /
• pp.279-289
• /
• 2012

This study was conducted to survey and diagnose operation status of the agricultural machinery rental service, analyse and compare operational efficiency among 82 city and county ATDEC (agricultural technology development and extension center) using the DEA (Data Envelopment Analysis) method, and recommend future direction, for improvement of the business. Input variables were invested budget and labor, and output variable was rental return. Percentages of return to investment on the rental service were calculated as 68.3% and 63.9% when analyzed with CCR (Charnes, Cooper and Rhodes) and BCC (Banker, Charnes and Cooper) models, respectively, indicating inefficiency of the service operation. Increase of rental charge would increase efficiency by 63.9~68.3% depending on models, and decrease of financial and labor investment would improve the efficiency by about 11.3%. Technical efficiency would be more important than scale efficiency, therefore adjustment of over-invested budget and labor needed to be made together with increase of rental charge to improve the operation. Among the ATDECs providing the rental service, 6 (7.3%), 43 (52.4%), and 33 (40.2%) were in state of CRS (constant return to scale), IRS (increasing return to scale), and DRS (decreasing return to scale), respectively. These indicated public aspects of the rental system, over-investment, lack of output component for input component, meaning that scale income would be increased by qualitative expand of rental charge. Efficiency analysis of the rental system by region showed that efficient ATDECs to be benchmarked by others were in the order of DMU-70, DMU-54, DMU-29, DMU-5, DMU-22, DMU-2, and DMU-61. More comprehensive and extensive survey and analyses would be necessary in the future.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2014.10a
• /
• pp.363-365
• /
• 2014

Internet baking, e-commerce, business processing, etc on smartphone handing could be possible in present days. Ambiguity between cyber and real life has made vulnerability on infrastructure, Gov't Service and National security by cyber terrorism. Especially, Lots of Infrastructure and Gov't Service based on Information Technology were exposed by Cyber terror. Legal system should be improved to keep from these threats. This paper proposed needs of cyber legal system by analyzing proposed cyber related code on Korean National Assembly, issue on Cyber Control Tower, National Cyber Security Industry and Human resource.

• Journal of Korea Port Economic Association
• /
• v.32 no.2
• /
• pp.123-135
• /
• 2016

This study uses Data Envelopment Analysis(DEA) to investigate the management efficiency of Korean shipping companies based on business administration costs such as corporate entertainment, advertisement, and labor costs. We analyze shipping enterprises listed on the Korean stock market of the period of 2010-2014. Corporate entertainment, advertisement and labor costs are used as input variables and sales and net income are used as output variables. We use technical efficiency, pure technical efficiency, scale efficiency and returns to scale to propose a plan to improve the efficiency of inefficiency decision-making units (DMUs). The results of the efficiency analysis show that six of the DMUs in the technical efficiency of CCR model and eight of the DMUs in the pure technical efficiency of BCC model are in efficient state. In terms of return to scale, six of the DMUs(24% of all DMUs) show increasing returns to scale, while 13 DMUs(52% of all DMUs) showdecreasing returns to scale. Because multiple efficient state for DMUs exist in the technical efficiency analysis, we conduct a super efficiency analysis. The results show that the efficient state of the twomost efficient DMUs are 1.314 and 1.243, respectively. This implies that these DMUs could maintain their current levels of the efficiency if they increase the amount spent on advertisements, corporate entertainment and labor costs by 31.4% and 24.3%. respectively. We conclude this study by providing the efficiency states of each DMU and target for improving the inefficiencies in each case.

• Journal of Korea Society of Industrial Information Systems
• /
• v.27 no.4
• /
• pp.105-114
• /
• 2022

As the national income level is improving, housing urbanization and economic speed are progressing rapidly, household waste and food waste are rapidly increasing. The "Waste Management Act" (founded in 1991) introduced the volume-based household waste system in 1995, and even after implementation, the odor of food waste and the prompt disposal process continue to be a social problem.For this reason, the food waste recycling business is attracting attention. In this paper, regarding the role of resource recycling such as feed, compost, and other resources of food waste, this thesis aims to reduce the inefficiency of the recycling process. Data Envelopment Analysis (DEA) of the relationship between inputs and outputs of 33 facilities nationwide, excluding facility data (insufficient) among 394, (238 public, and 156 private ones), as of the end of 2020, which is running a domestic resource recycling project This study was conducted to investigate the important role in the relative management performance of food waste recycling facilities.It was hypothesized that the influence of business history, facility capacity, capital, and machinery of a company running a food waste recycling business on sales was tested.

• Review of KIISC
• /
• v.21 no.6
• /
• pp.24-41
• /
• 2011

7.7 DDoS공격과 3.4DDoS공격, NH금융전산망마비사건, 네이트 해킹 사건 등은 해킹이 개인적 문제를 지나서, 사회와 국가적인 이슈로 부상되고 있다. 중국은 대학에서 해킹 기법을 가르치고, 인민해방군에 국가일꾼이란 소명의식을 주고 있다. 북한은 지도자의 지시로 노동당과 북한군에서 사이버부대를 직접 교육 운영하고 있다. 미국은 외국으로부터 사이버 공격을 당할 경우 이를 '전쟁 행위'로 간주해 미사일 등으로 대응한다는 방침을 세웠다. 이와 같이 해킹은 국가사이버보안 정책에서 다루어져야 할 필요성이 있다. 본 연구에서는 해커의 변천, 해킹기술과 방법, 해킹 툴, 그리고 해킹 사례를 살펴본다. 또한 해킹 동향 분석에서 해킹기술 동향 분석, 해커(사람) 동향 분석, 해킹 지역(국가) 동향 분석을 통하여 해킹 인력의 조직화, 해킹 기술의 집적화, 해킹 조직의 집중화 연구를 한다. 그리고 국가사이버보안정책에서 해킹에 대한 '국자사이버보안법 시행령' 제정, 국가사이버보안 자문회의, 국가사이버보안 협력회의, 해킹 프로세스 전략, 해킹 전략 추진 방법론, 사이버협력국, 해킹 작전국, 인력 양성국, 해킹 기술국에 관한 저자의 개인 의견을 제안한다.

• Proceedings of the Korean Society of Computer Information Conference
• /
• 2011.06a
• /
• pp.165-169
• /
• 2011

저탄소 녹색성장 정책의 일환으로 추진되는 Smart Grid 사업은, 전력인프라와 IT인프라가 융합 되면서 지능화된 전기 에너지의 효율성 향상을 목적으로 전기망 내 송배전을 실시간으로 관리할 수 있게 운영하는 지능형 전기망이다. 하지만 기존의 인터넷망과 IT 통신 인프라와 융합되면서 Smart Grid 인프라에서도 IT보안 취약점 문제가 존재한다. 본 논문에서는 Smart Grid 인프라를 요소별로 분석한다. 그리고 Smart Grid 인프라의 보안성 분석을 통하여 보안의 취약점을 가져 올 수 있는 Smart Grid에 대한 보안 이슈를 분석한다. 그리고 Smart Grid 보안성 기준에 따른 보안기술정책을 연구하고, 보안 표준과 보안 방안을 제시한다. 본 연구를 통하여 안전한 Smart Grid 보안기술정책을 위한 법 제정에 기초자료가 될 것이다.

• Journal of Digital Convergence
• /
• v.18 no.1
• /
• pp.35-44
• /
• 2020

The purpose of this paper is to investigate various factors affecting the efficiency of China IC industry, reflecting the resource utilization and overall development level of China IC industry. In this paper, three input indicators (R&D Expenditure, Cash paid to and for employees, Total fixed assets) and two output indicators (Net profit, Sales revenue) were selected for 17 listed companies in the IC industry with operating profit of less than 1 billion yuan in 2018 and applied the technology efficiency theory and DEA analysis method to analyze the relative efficiency of the output base. The study found that one of the 17 companies analyzed was efficient, two were inefficient on an inadequate scale, and the rest were inefficient due to insufficient production technology, scale and management level. This study argues that enterprises should reduce resource input appropriately and strengthen scientific and technological innovation management to maximize resource utilization efficiency. Therefore, this study has important practical significance for improving the efficiency of IC enterprises. The Malmquist method will be used to study the total factor productivity of small and Medium-sized companies in IC industry.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2022.05a
• /
• pp.427-427
• /
• 2022

하천에서 유사량 자료는 하천의 이·치수 목적으로 활용할 수 있는 기본 자료중 하나로서 하상 변동 예측, 저수지 퇴사량 추정, 하도 계획과 설계, 유사조절 계획 수립 및 기타 구조물 등의 영향 평가 등 다양하게 활용할 수 있다. 본 연구에서는 신뢰성 높은 유사량 자료를 생산하기 위하여 국가유사량관측망 중 27개 지점에 대하여 유사량의 측정 및 특성분석을 수행하였다. 유사량 측정과정은 사전조사, 현장측정, 실험실분석, 모형적용(총유사량 산정) 단계로 구분할 수 있다. 사전조사 단계에서는 현장관련 정보를 수집하여 현장측정 계획 및 현장 안전대책을 수립하고, 현장측정 단계에서는 사전조사 단계에서 수립한 계획을 바탕으로 유사량을 측정하였다. 유사량 측정시 측선은 ISO 기준 이상의 5~7개로 측선을 나누어 측정하였고, 측정장비는 D-74, DH-48 부유사 채취기를 이용하여 왕복수심적분법으로 수행하였다. 실험실분석은 한국수자원조사기술원 유사량 실험실에서 채취시료에 대한 농도, 레이저회절법을 이용한 입도분석, 하상토분석(체분석), 비중실험을 수행하였다. 총유사량 산정을 위한 모형적용 단계에서는 수정-아인슈타인법(Modified Einstein Method)을 적용하였다. 또한, 유량-부유사량 농도 변화양상과 부유사량 특성 분석을 이용한 부유사량 측정결과를 평가하였고 각 지점의 부유사량특성을 잘 나타낼 수 있는 지수식(Q_ss = aQ^b)을 이용하여 유량-부유사량관계곡선식을 개발하였다.

• Review of KIISC
• /
• v.22 no.8
• /
• pp.31-35
• /
• 2012

안전결제 시스템(ISP)의 사고 건수는 2007년 5천만원부터 2010년 1억7천만원, 최근인 2012년 1억 8천만원으로 증가하고 있다. 안전결제 시스템은 국내 최초의 PKI기반 전자서명방식을 적용한 신용카드 인터넷 결제서비스 이다. 안전결제 시스템에 대한 해킹사고가 국민에게 직접적인 금전 피해를 야기 시켜서 사고에 대한 취약점 분석 및 대응 지침에 관한 연구가 필요하다. 본 논문에서는 안전결제 시스템에 대해 정의하고 원리를 파악하여 취약점을 기술하고 분석하여 취약점에 따른 대응 지침을 연구한다. 아울러 국가와 국민의 사이버 안전을 보호하고, 국민들에게 보다 안전하고 편리하게 온라인 결제를 할 수 있도록 하는 연구가 될 것이며 미흡한 온라인 보안 강화를 위한 전자상거래법 개정안이 채택되는데 도움이 될 것이다.

• The Journal of the Korea Contents Association
• /
• v.22 no.3
• /
• pp.369-379
• /
• 2022

With the deepening integration of technology and cultural industries, China's digital cultural industry has begun to rise. The digital culture industry has met new demands for cultural consumption and brought new experiences to consumers in the digital economy era. This paper uses the public data of 36 Chinese A-share listed companies in digital culture from 2018 to 2019 to construct a technical innovation efficiency evaluation index system for listed companies in China's digital cultural industry. Through the use of data envelopment analysis (DEA) method, the technical innovation efficiency of 36 listed companies in China's digital cultural industry was evaluated. The research results show that: (1) China's 36 listed companies have low technological innovation efficiency; (2) the allocation of R&D resources of listed companies is unreasonable; (3) there is a large difference in technological innovation efficiency among listed companies. Therefore, it is necessary to increase the efficiency of technology innovation of listed companies in China's digital culture industry by investing more R&D funds, distributing R&D resources, establishing effective dynamic incentive mechanism, promoting government-industrial-academic research.