• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.12 no.5
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• pp.740-746
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• 2001

Radio interferences have been a frequent problem on the TRS service, which has been in operation in the southern coastal area of Korea since 1994. By Korea-Japan joint analysis, the main reasons of the radio interferences are due to the radio ducting signal from the seaside of Japan. As the mobile services become spreading in China as well as Japan, interference problems between Korea and China will occur more frequently in various frequency bands. Therefore, in this paper we propose a method for measurement and analysis of the radio interference signal, and summarize the measurement results of interference from China, which was performed to solve the interference problem between Korea and China.

• Journal of Korean Institute of Fire Investigation
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• v.11 no.1
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• pp.155-166
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• 2007

This study is to deduce problems and grope for its solution by investigating the general operation status about the present fire investigation in Korea. As for the problems, this study is to point out that they are application of diversion by the function of law for fire investigation, execution of individualized fire investigation by each institution, total lack of information sharing system for fire investigation, and weakness of cause investigation for arson. The reform measures are as follows: the unity of law for fire investigation, joint investigation by the related institutions, early introduction of civil fire investigation expert system, extension of special research institutes for fire investigation, introduction of system for sharing information of fire investigation, and operation of fire investigation team for cause investigation for arson.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.7
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• pp.3197-3206
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• 2011

The objective of this study is to provide the guide for producing data for effective analysis of weapons systems and munitions. Therefore, the prototype from the study of creating the effectiveness data of surface to surface Artillery system under different battle environments was developed in this paper. For this purpose, mathmatical method which is in use of calculating Lethal Area and EFC(Expected Fractional Casualty) is analyzed and applied to the prototype for generating effectiveness data of surface to surface Artillery system. To validate the suggested prototype, we did the following actions: we select the source data corresponding to JMEM(Joint Munition Effectiveness Manuals) data and apply our prototype to the source data, and then match the results to check validity.

• Review of KIISC
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• v.33 no.4
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• pp.117-124
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• 2023

최근 인공지능, 디지털 트윈, 메타버스 기반의 신규 ICT 서비스가 도입되면서 이러한 서비스에서 발생할 수 있는 프라이버시 위험의 적절한 처리는 매우 중요하게 대두되었다. 이의 대표적인 기술적 대책이 프라이버시 강화 기술의 적용이다. 이와 관련하여 개인정보보호 국제표준은 국가나 조직의 관행과 기술을 국제 표준으로 개발하여 상호 연동이 가능한 서비스를 제공하는 역할을 하며, 이로 인해 제품이나 서비스의 경쟁력을 강화하는데 활용될 수 있다. 개인정보보호 국제 표준화를 주도적으로 추진하고 있는 대표적인 국제 표준화 그룹으로는 국제표준화위원회/전기위원회 합동위원회 1/서브위원회 27/작업그룹 5 (ISO/IEC JTC 1/SC 27/WG 5)가 있으며, 독일 쾨테대학의 Kai Rannenberg 교수가 이 그룹의 의장을 맡고 있다. 2022년 ISO/IEC JTC 1/SC 27/WG 5 전자회의 이후 우리나라 주도의 국제표준은 2건 채택되었다. 차기 회의는 2023년 10월 서울에서 원격 참여가 허용된 대면회의로 개최될 예정이다. 본 고에서는 이 그룹에서 2022년 7월 이전 채택된 개인정보보호 관련 국제표준과 현재 개발 중인 주요 국제표준 동향을 살펴보고자 한다. 또한 지난 4월 SC27 WG5 회의에서 논의된 개인정보보호 관련 주요 표준화 이슈와 대응 방안을 제시한다.

• Korean Security Journal
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• no.49
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• pp.67-93
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• 2016

This study aims to analyze protocol & security systems of international conferences such as 2010 Seoul G20 Summit, 2012 Seoul Nuclear Security Summit and to propose Improvement strategies. The results derived from this study are as follows. First, it is necessary to support the establishment of international conference laws. We should select a major agency for 'International Conference Industry Promotion Act', coordinate of the system of international conference laws, resolve potential conflicts, maintain consistent on support organization of international conferences. Second, it is necessary to coordination among different ministries that control security relevant laws. We should solve clashes possibility between a few laws on security system which is closely related to protocol & security of international conference. Third, it is necessary to produce a joint protocol handbook of government for establishing protocol & security system of international conferences. We should try to confirm protocol & security system of international conferences through publishing a joint protocol handbook of government from their own protocol handbook of the executive, the legislature, etc. Forth, it is necessary to build and strengthen expertise of PCOs(professional convention organizers). We should find and assist several PCOs for achieving government policy that develop industrial foundation on international convention and train human resources on international convention expected next generation of promising industries.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.11 no.4
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• pp.157-164
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• 2011

It is very difficult problem to factorize composite number. Integer factorization algorithms, for the most part, find ($a,b$) that is congruence of squares ($a^2{\equiv}b^2$(mode $n$)) with using factoring(factor base, B) and get the result, $p=GCD(a-b,n)$, $q=GCD(a+b,n)$ with taking the greatest common divisor of Euclid based on the formula $a^2-b^2=(a-b)(a+b)$. The efficiency of these algorithms hangs on finding ($a,b$). Fermat's algorithm that is base of congruence of squares finds $a^2-b^2=n$. This paper proposes the method to find $a^2-b^2=kn$, ($k=1,2,{\cdots}$). It is supposed $b_1$=0 or 5 to be surely, and b is a double number. First, the proposed method decides $k$ by getting kn that satisfies $b_1=0$ and $b_1=5$ about $n_2n_1$. Second, it decides $a_2a_1$ that satisfies $a^2-b^2=kn$. Third, it figures out ($a,b$) from $a^2-b^2=kn$ about $a_2a_1$ as deciding $\sqrt{kn}$ < $a$ < $\sqrt{(k+1)n}$ that is in $kn$ < $a^2$ < $(k+1)n$. The proposed algorithm is much more effective in comparison with the conventional Fermat algorithm.

• Fire Science and Engineering
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• v.32 no.6
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• pp.84-90
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• 2018

Chemical accidents occur in various forms, such as explosions, leaks, spills, and fires. In particular, chemical accidents caused by fires seriously affect the surrounding air environment due to soot, causing anxiety to the residents. Therefore, it is important to identify the causative substances quickly and examine the influence of air quality in the surrounding area. In this paper, proton transfer reaction-time of flight mass spectrometry(PTR-ToFMS) was used to identify the causative material in a fire and monitor the air quality in real time. This analyzer is capable of real-time analysis with a rapid response time without sample collection and pretreatment. In addition, it is suitable for quantitative and qualitative analysis of most volatile organic compounds with high hydrogen affinity, to identify the cause of fire and examine the influence of ambient air. In April 2018, when a local fire occurred, methanol, acetone, and methyl ethyl ketone were the main causative agents in PTR-ToFMS.

• Journal of the Korean School Mathematics Society
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• v.26 no.2
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• pp.111-135
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• 2023

This study conducted a student-centered inquiry lesson on the similarity of figures using AlgeoMath, with student learning aspects analyzed from a communication perspective. This approach aimed to inform pedagogical implications related to teaching geometric similarity. Through utilizing AlgeoMath, students were able to visually confirm that their chosen figures were similar, experiencing key mathematical concepts such as the ratio of similarity to the area of similar figures, and congruency and similarity conditions of triangles. In the lessons applying this concept, we categorized the features of similarity learning displayed by students, as seen in the communication aspects of their exploratory activities, into 'Understanding similarity ratios', 'Grasping conditions of similarity in triangles', and 'Comparing concepts of congruency and similarity'. Through exploratory activities based on AlgeoMath, students discussed the meaning and mathematical relationships of key concepts related to similarity, such as the ratio of similarity to the area of figures, and the meaning and conditions of congruence and similarity in triangles. By improving misconceptions about the similarity of figures, they were able to develop deeper mathematical understanding. This study revealed that in teaching and learning the geometric similarity using AlgeoMath, obtaining meaningful pedagogical outcome was not solely due to the features of the AlgeoMath environment, but also largely depended on the teacher's guidance and intervention that stimulated students' thinking.

• Journal of The Korean Association of Information Education
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• v.5 no.1
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• pp.33-45
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• 2001

In order to adapt ourselves to the Informationalization Society of twenty-first century, it is required to have ability to find quickly the necessary information and solve the problem of our own. In the field of school, it should be educated to develop learner's ability that can cope with the Informationalization Society. When a learner can study in such direction, he or she will be able to plan the learning of his own as the subject of education, and develop his ability to solve the problem by collecting and examining various information. It is self-leading learning that can make education like this possible. Through computer, especially Web site, self-directed learning can develop can develop the individuality and creativity of learners. They can collect and utilize autonomously information and knowledge. To do such an education, the program that can work out self-directed learning is needed. Therefore the program I want to develop is to reconstruct the 'figure' part of mathematics in elementary school into five steps by utilizing Web site. In the first step is to learn the concept of various shape. This step enable learners to know what figure is and how it can be utilized in our real life. The second step of dot, line and angle makes it possible that learners can consolidate the foundation of the study about figure and recognize the relation between angle and figure. In the third step of plane figure, we can study how to calculate the relation of plane figures and the area of figure with various shapes by cutting and adding them. The fourth step is about congruence and symmetry. Learners can learn to know the figure in congruence, reduction and enlargement and how it is used in our real life. In the fifth step of solid figure, we can learn the relation among the plane figure, solid figure, the body of revolution, corn and pyramid etc. controling the speed of learning on the basis of his ability. In the process of the program, it is also possible to develop learner's ability of self-leading learning by solving the problem by himself. Because this program is progressed on the Web site, it is possible to learn anytime and anywhere. In addition to it, a learner can learn beyond the grade as well as do the perfect learning by controling the pace of learning on the basis of his ability. In the process of the program, it is also possible to develop learner's ability of self-leading learning by solving the problem by himself.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.37 no.8
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• pp.961-966
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• 2013

A coupled governing equation of thermoelectric materials can be converted into an uncoupled form to predict the effective Seebeck coefficient of thermoelectric composites, where modified Eshelby model is adopted. The predicted results by the present approach for serial- and parallel-connected composites and composite with spherical inclusions are compared with theoretical and experimental results from literatures to be justified. It is shown that the predictions by the theoretical approaches coincide exactly and show in good agreement with the experiments.