• Review of KIISC
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• v.29 no.2
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• pp.29-35
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• 2019

CPS(Cyber Physical System)에 대한 사이버 공격이 다양해지고 고도화됨에 따라 시그니쳐에 기반한 악성행위 탐지는 한계가 있어 기계학습 기반의 정상행위 학습을 통한 비정상행위 탐지 기법이 많이 연구되고 있다. 그러나 CPS 보안 연구는 보안상의 이유로 CPS 데이터가 주로 외부에 공개되지 않으며 또한 실제 비정상행위를 가동 중인 CPS에 실험하는 것이 불가능하여 개발 기법의 검증이 어려운 문제가 있다. 이를 해결하기 위해 2015년 SUTD(Singapore University of Technology and Design)의 iTrust 연구소에서 SWaT(Secure Water Treatment) 테스트베드를 구성하고 36가지의 공격을 수행한 데이터셋을 공개하였다. 이후 국 내외에서 SWaT 테스트베드 데이터를 사용하여 다양한 보안 기법을 검증한 연구결과가 발표되고 있으며 CPS 보안에 기여하고 있다. 따라서 본 논문에서는 SWaT 테스트베드 데이터 및 SWaT 테스트베드 데이터에 기반한 비정상행위 탐지 연구를 분석한 내용을 설명하고, 이를 통해 CPS 비정상행위 탐지 설계의 주요 요소를 분석하여 제시하고자 한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.2
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• pp.822-826
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• 2012

This study practically analyzed the relationships of safety awareness and safety practice of the day-care teacher according to the presence of CCTV and in particular, made a practical analysis about whether safety awareness have mediation effects in the relationship between presence of CCTV and safety practice. As a result of T-test analysis, safety awareness and safety practice of the day-care teacher according to the presence of CCTV is different that has been verified. As a result of regression analysis, safety awareness were positively related to safety practice. That is to say, even the mediation effects that the presence of CCTV through safety awareness related to safety practice were verified. As a result, it was concluded that safety awareness factors didn't play mediator roles between presence of CCTV and safety practice.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.9
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• pp.215-224
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• 2018

The purpose of the this study was to verify a model for the structural relationships of the behavioral attitude, subjective norm and perceived behavioral control of 119 emergency medical technicians to their safety attitude and safety behavior. A survey was conducted on 373 male and female 119 emergency medical technicians who were working as fire-fighting officers in Seoul, Inheon, Gangwon Province, Daegu, South Chungcheong Province, North Gyeongsang Province and Busan. The collected data were statistically analyzed by SPSS 20.0 and AMOS 16.0. The findings of the study were as follows: First, the behavioral attitude of the 119 emergency medical technicians was found to have affected and safety behavior(t=.32, p<.001). Second, the subjective norm of the 119 emergency medical technicians was found to have exerted an influence on their safety attitude and safety behavior(t=.27, p<.001). Third the perceived behavioral control of the 119 emergency medical technicians was found to have influenced their safety attitude and safety behavior(t=.28, p<.001). Fourth, the safety attitude of the 119 emergency medical technicians was found to have had an impact on their safety behavior(t=.39, p<.001).

• Journal of Gifted/Talented Education
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• v.11 no.2
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• pp.1-21
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• 2001

The purpose of this study was to investigate the effects of project activities on the development of problem solving skills and creativity of elementary school children. To achieve this purpose, 83 second grade children were sampled in Seoul-City, and they were assigned to experimental group and control group. Two project activities of social studies subject were treated to the experimental group for 4 weeks. And, the ‘Problem Solving Skills Test’ and ‘Creativity Test’were administered to both group children for the pretest and posttest. The collected data were analyzed by t-test to test the research hypothesis. The major findings of this study were as follows: Firstly, there were statistically significant differences between experimental group and control group on the posttest scores of problem solving skills. It showed that the posttest scores of comprehension skills[t(81)＝3.09, p＜.01], practical skills[t(81)＝2.40, p＜.05], and the total score of problem solving skills[t(81)＝4.24, p＜.01] were significantly higher than that of control group. Secondly, there were statistically significant differences between experimental group and control group on the posttest scores of creativity. It showed that the posttest scores of fluency[t(81)＝4.33, p＜.01], originality[t(81)＝2.85, p＜.01], and the total score of creativity[t(81)＝6.43, p＜.01] were significantly higher than that of control group.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2013.05a
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• pp.1423-1424
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• 2013

• The Journal of the Korea Contents Association
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• v.20 no.8
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• pp.359-367
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• 2020

WSNs as the main technology of IoT often deliver information or authenticate based on location. Thus, verifying location information is essential. This paper aims to present the comprehensive analysis and classification of location verification techniques in WSN. For this, classification criteria are suggested based on the result of feature analysis of existing techniques. In addition, the existing techniques are classified according to the suggested criteria, and each characteristic and development direction are described. The result of this paper is expected to be a useful reference material when designing a new technique.

• Advanced Industrial SCIence
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• v.2 no.3
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• pp.8-14
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• 2023

The majority of IoT devices already employ AIoT, however there are still numerous issues that need to be resolved before AI applications can be deployed. In order to more effectively distribute IoT edge resources, this paper propose a machine learning-based approach to managing IoT edge resources. The suggested method constantly improves the allocation of IoT resources by identifying IoT edge resource trends using machine learning. IoT resources that have been optimized make use of machine learning convolution to reliably sustain IoT edge resources that are always changing. By storing each machine learning-based IoT edge resource as a hash value alongside the resource of the previous pattern, the suggested approach effectively verifies the resource as an attack pattern in a distributed AIoT context. Experimental results evaluate energy efficiency in three different test scenarios to verify the integrity of IoT Edge resources to see if they work well in complex environments with heterogeneous computational hardware.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.24 no.6
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• pp.1037-1044
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• 2014

A (t,n) threshold secret sharing scheme is the scheme which allows a trusted party to distribute the shares among n participants in such a way that any t of them can recover the original secret, but any group knowing only t-1 or fewer shares can not. Recently, Eslami et al. and Tadayon et al. proposed threshold multi-secret sharing schemes, respectively. They proposed that their schemes don't require secure channels. But, without secure channels in their schemes, everyone can get the shares and find the secrets. The proposed scheme does not use secure channels and only t participants can solve the equations of the system from the delivered share shadows and find the secrets.

• Journal of Navigation and Port Research
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• v.45 no.4
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• pp.181-185
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• 2021

This study deals with the development of a phrase buoy control system that can receive and analyze phrase information using an IoT-based communication network to determine whether a phrase is normal or missing, to manage the current state of the phrase, check the status of the phrase in case of abnormal conditions in the phrase, and conduct management of the phrase. The fishing gear management system and integrated control structure design using an IoT-based communication network were developed, and a system test and verification were carried out to verify the effectiveness of the system.

• Proceedings of the KIPE Conference
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• 2014.07a
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• pp.61-62
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• 2014

본 논문은 DC 80kV급 전류형 HVDC Valve의 Type Test를 위하여 개발된 대전류원과 고전압 공진회로로 구성된 합성시험 설비를 소개하고 DC 80kV급 HVDC Vavle의 Type Test를 통하여 Valve의 성능을 검증한다.