• Journal of the Korea Institute of Information Security & Cryptology
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• v.16 no.2
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• pp.71-80
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• 2006

To guarantee secure communication in wireless sensor networks, secret keys should be securely established between sensor nodes. Recently, a simple key distribution scheme has been proposed for pair-wise key establishment in sensor networks by Anderson, Chan, and Perrig. They defined a practical attack model for non-critical commodity sensor networks. Unfortunately, the scheme is vulnerable under their attack model. In this paper, we describe the vulnerability in their scheme and propose a modified one. Our scheme is secure under their attack model and the security of our scheme is proved. Furthermore, our scheme does not require additional communication overhead nor additional infrastructure to load potential keys into sensor nodes.

• Environmental and Resource Economics Review
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• v.25 no.4
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• pp.495-516
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• 2016

This study empirically examines how asymmetric price adjustment of the retail gas price happens differently for various oil products, such as high-grade gasoline, regular gasoline, and diesel, by employing asymmetric error correction model within weekly data set from 2010~2015. Our estimation results show that the price adjustment, across the all oil types, predicated on shifting crude oil and wholesale oil prices is asymmetric. In addition, the duration of asymmetry was shorter in high-grade gasoline case than in other oil types. This took place by rapid price adjustment of high-grade gasoline price when faced with both cost increases and decreases, in comparison with regular gasoline and diesel cases. There results were attributed by characteristics of the consumer group and a high retail-wholesale margin of high-grade gasoline.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.43 no.1
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• pp.91-98
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• 2023

Since risks occurring in construction projects can have a significant impact on schedules and costs, there have been many studies on this topic. However, risk analysis is often limited to only certain construction situations,and experience-dependent decision-making is therefore mainly performed. Data-based analyses have only been partially applied to safety and contract documents. Therefore, in this study, cluster analysis and a Word2Vec algorithm were applied to formal documents that contain important elements for contractors or clients. An initial classification of document content into six types was performed through cluster analysis, and 157 occurrence types were subdivided through application of the Word2Vec algorithm. The derived terms were re-classified into five categories and reviewed as to whether the terms could develop into potential construction risk factors. Identifying potential construction risk factors will be helpful as basic data for process management in the construction industry.

• Proceedings of the Korea Contents Association Conference
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• 2017.05a
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• pp.399-400
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• 2017

4차 산업혁명은 정보통신기술(ICT)의 발전으로 인한 다양한 산업분야의 혁명적 변화를 말한다. 이러한 변화는 한 기술자체의 발전뿐만 아니라 기술 간 융합과 연결을 통해 더 가속화될 수 있다. 학술적 영역에서도 ICT의 발전과 함께 디지털화에 소요되는 비용이 줄어들어 디지털화를 기반으로 한 학술논문의 공개, 공유의 움직임이 시작되었다. 학술논문의 공개와 공유는 기술 간 융합과 연결이 원동력이 되는 4차 산업혁명 시기에 더 중요하고 필요한 일이 되었다. 따라서 한 편의 학술논문이 가지는 고유의 가치와 수집된 논문이 집합체로서 활용을 통해 실현될 수 있는 잠재적 가치에 대해 알아보고자한다. 학술논문의 가치에 대한 평가를 통해 4차 산업혁명 시대를 더 잘 준비하기 위한 일환으로 학술논문의 가치 제고 방안에 대한 논의와 실행이 필요하다.

• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 2006.05a
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• pp.294-299
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• 2006

한국에서는 석유화학 산업의 역사가 30년 이상이 되어 잠재적인 사고의 위험 가능성이 높아지고 있다. 지금까지의 석유화학 산업에서의 전통적인 위험성 평가와 시스템의 제어는 기계적인 결함에만 중점을 두었기 때문에 인간의 행동을 제어하는 것은 간과하여 왔다. 비록 자동화 기술가 제어기술의 발전이 필요함에도 불구하고 인간의 의사 결정 요소는 석유화학 산업에서 사고를 예방하는데 필수적이다. 대부분의 심각한 사고는 부적절한 인간의 행동과 안정장치의 기계적인 결함이 동시에 존재할 경우에 발생한다. A-HRA(Advanced Reliability Analyzer) 소프트 웨어는 석유화학 플랜트 내에서의 인적오류 확률을 분석하고 사고 데이터를 축적하기 위하여 개발되었다. A-HRA 프로그램을 이용하여 1960년대 이후부터 최근 까지 한국의 석유화학 산업에서 발생하여온 인적오류 사고 데이터를 입력하고 사고마다의 근본원인과 수행영향인자를 분석하였다. 이 본문에서는 Root cause Aanlysis을 통한 결과와 PIF(Performance Influencing Factor) 평가 결과를 보여준다. 이 분석 결과는 석유화학 산업의 안전을 극대화 시키면서도 인적오류 제어를 통하여 안전비용을 최저화 시킬 수 있는 대책을 제시할 것이다.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• autumn
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• pp.359-364
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• 2003

The loss of potential opportunity profit which is consisting in the partial markups of the corporation would taking placed in related with the time-delay deeply, has customarily disregarded in contract adjustment under the principles of denial of cost accounting method, declined conjecture in the point of benefits and protection of the law in scope of compensation and the restricted conditions of constant contract. It is being resulted from that the policies of the general principles of accounting standards which is subjected to ask an objective data and evidence, and the denial system as a debt derived from imperfect legal theory applied by current law. Therefore, it is necessitated to find if any irrationality in the positive system is and further to draw an improved reasonable measures to adopt by review of constant system preparing tile reasonableness with the method of suitable quantification devices provided that any time-delay is induced by the party.

• The Journal of Information Technology
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• v.3 no.4
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• pp.13-21
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• 2000

The thesis is for the analysis of the current trend adapted for the method of the test information exchange in the environment of the internal circuit in case of PCB design, The design process is most powerful for improving test characteristics among the entire process of PCB. The PCB is more and more difficult to test as the processes proceed because the nodes become more and more complicated. The data exchange for improving PCB test performance should be easy in order to provide more reliable products in the shorter period. The design technology oriented for the test makes the PCB and its components tested reliably and quickly so that it can effectively improve the quality of the PCB and largely reduce the time and cost of the test development, In addition it can make the substantial standardization In improve the speed of the repeated test and treatment so that the Period of development can be shorter. Also, it helps to effectively detect the potential defects of the products, so that highly reliable PCB can be produced.

• Korean Journal of Environment and Ecology
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• v.33 no.4
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• pp.408-421
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• 2019

This study estimated and analyzed the incremental profits to compare the imported buff-tailed bumblebees, Bombus terrestris, and their pollination alternatives. A result of the analysis showed that the incremental profit, which is defined as the sales revenue minus the common production cost, was higher when using pollinator insects than when using the artificial pollination and that the incremental costs were lower when using domestic bumblebees or artificial pollination than when using imported bumblebees or honeybees. The incremental profits of each alternative were 46,801 million won for imported bumblebees, 47,170 million won for domestic bumblebees, 46,975 million won for honeybees, and 29,839 million won for artificial pollination. The incremental profit means the accounting profit that can be realized from each alternative. However, not all of the accounting profits can be attributed to pollen-mediated alternatives since they include potential costs such as imputed rent or normal profits. Considering the opportunity costs, which are the potential costs, it appears that the alternative of using imported bumblebees can lead to an economic loss. It means that fruit and vegetable farmers can expect additional economic profits if they choose other alternatives instead of using imported bumblebees.

• The KIPS Transactions:PartD
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• v.12D no.4 s.100
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• pp.657-662
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• 2005

The Non-Sampling Error can happen any time by means of the intended or unintended error by the interviewer or respondent, but it is very difficult to find the error in survey database because it can hardly be computed mathematically and systematically. Until now, we have found it accidentally through the simple relation between the items or through the inspection from the random field. Therefore we introduced an heuristic methodology that can detect the interviewer's error by statistical decision-making or data mining techniques with a case study. It will be helpful so as to improve the statistical duality and provide efficient field management for the supervisor.

• Journal of the Korean Institute of Intelligent Systems
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• v.18 no.1
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• pp.27-31
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• 2008

많은 바이오인포매틱스 관련 데이터베이스와 도구가 네트워크를 통해서 제공되고 있고, 이들을 효과적으로 활용하면 생물학적 분석을 적은 비용으로 우수한 결과를 얻을 수 있다. 이 논문에서는 주어진 질의에 대해서 잠재적으로 관련된 DNA 서열 정보를 획득하고, 분석자가 관심 있는 항목을 선택하면, 선택된 항목에 대한 모든 DNA 서열 정보를 확보하고, 이들에 대해서 아미노산 서열로 자동변환하여 ORF라는 정보를 활용하여 가장 가능성이 큰 것을 추천하는 도구를 소개한다. 해당 도구에는 웹 로봇 기법과 ORF 검색등을 위한 생물학적 지식을 활용한다.