• 융합보안논문지
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• 제13권4호
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• pp.109-115
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• 2013

인터넷망을 이용한 정보 전달의 대표적인 수단인 이메일 서비스 등을 통한 보안위협이 급증하고 있다. 이러한 보안위협의 공격 경로는 첨부된 문서파일에 악성코드를 삽입하고, 해당 응용프로그램의 취약점을 이용하여 사용자의 시스템을 감염시키게 된다. 따라서 본 연구에서는 파일 전송과정에서 위장악성코드의 감염을 차단하기 위해, 논리적 망 분리인 FTS(File Transfer System)를 이용한 무결성 검증 및 행위기반 탐지 시스템을 제안하고, 기존의 보안기법과의 비교 및 검증하고자 한다.

• 정보와 통신
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• 제13권3호
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• pp.61-70
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• 1996

본 논문에서는 ATM Forum에서 제안하고 있는 LAN 에뮬레이션 서비스 구조를 소개하였다. LAN 에뮬레이션은 기존의 방대한 LAN 응용 소프트웨어들을 ATM 망에서 그대로 사용하기 위하여 ATM 망에서 기존의 비연결형 LAN 서비스를 에뮬레이트하는 MAC 계층 서비스를 제공한다. LAN 에뮬레이션에 의하여 ATM 망상에는 논리적인 오버레이 망인 에뮬레이트된 망이 형성되는데, LAN 에뮬레이션 서비스는 에뮬레이트된 LAN의 각 종단 시스템에 설치되는 LAN 에뮬레이션 클라이언트(LEC)들의 집합과 세 가지의 논리적 서비스 요소들로 구성된다. 이 세 가지의 논리적 서비스 요소들은 LAN 에뮬레이션 구성 서버(LE 서버), Broadcast and Unknown 서버(BUS)라고 불리우며, LF, 클라이언트는 이 세 가지 서버가 제공하는 서비스를 이용하여 기존 LAN과 ATM망과의 상호 연동 및 ATM 망에서의 LAN 응용간 투명한 통신을 지원한다.

• 한국IT서비스학회지
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• 제14권3호
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• pp.33-48
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• 2015

Recently, many users frequently share their opinions on diverse issues using various social media. Therefore, many governments have attempted to establish or improve national policies according to the public opinions captured from the various social media. In this paper, we indicate several limitations of traditional approaches for analyzing public opinions about science and technology and provide an alternative methodology to overcome the limitations. First of all, we distinguish science and technology analysis phase and social issue analysis phase to reflect the fact that public opinion can be formed only when a certain science and technology is applied to a specific social issue. Next, we apply a start list and a stop list successively to acquire clarified and interesting results. Finally, to identify most appropriate documents fitting to a given subject, we develop a new concept of logical filter that consists of not only mere keywords but also a logical relationship among keywords. This study then analyzes the possibilities for the practical use of the proposed methodology thorough its application to discovering core issues and public opinions from 1,700,886 documents comprising SNS, blog, news, and discussion.

• 융합신호처리학회논문지
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• 제3권1호
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• pp.21-26
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• 2002

비디오 스트림들은 사용된 압축 알고리듬의 구조와 화면의 복잡도 등에 따라 다양한 형태의 트래픽이 발생함으로, 송신측과 수신측 사이의 자원할당을 어렵게 할 뿐만 아니라, 현재의 인터넷과 같은 패킷 통신망에서는 연속적인 재생을 어렵게 한다. 따라서, 본 논문에서는 멀티스트림을 이용한 비디오 스트림의 평활화 방법을 제안한다. 제안한 방법은 스트림의 형태에 따라 LDU(logical data unit)를 정의한 후 일정한 크기로 다수의 스트림으로 생성하여 전송함으로써, 평활화와 선반입 과정에서 발생하는 버퍼링 시간을 줄일 수 있을 뿐만 아니라 네트워크의 지터에도 강하면, 클라이언트의 대역폭을 최대한 활용할 수 있는 효율적인 전송 특성을 얻을 수 있다.

• 논리연구
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• 제5권1호
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• pp.147-157
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• 2001

In this study I try to show some numerical analogy between Leibniz's binary system anc I-ching's symbolic system of duo rerum principia, imagines quator, octo figurae am 64 hexagrams. But, there is really a formal logical accordance in their symbolic foundations, on which are based especially the Wittgenstein's 16 truth-tables in his Tractatus-logico-philosophicus(5.101) am 16 hexagrams, as long as we interpret with the binary values 0 am 1, i.e. the Bi-Polarity, the logical tradition from J. Boole, G. Frege through B. Russell and AN. Whitehead to R. Wittgenstein. So, I argue that the historical and theoretical root of that tradition goes back to the debate between Bouvet and Leibniz about the mathematical structure of I-ching' symbols and the Leibnizian binary arithmetic. In the letter on 4. 11. 1701 from Peking to Leibniz, Bouvet wrote that the I-Ching's symbolism has an analogous structure with Leibniz's binary arithmetic. Corresponding to his suggestion, but without exact knowledge, in the letter of 2. January 1967 to the duke August in Braunschweig-Lueneburg-Wolfenbuettel had Leibniz shown already an original idea for the creation of the world with imago Dei which comes from binary progression, dark and light on water.

• 한국수학교육학회지시리즈A:수학교육
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• 제40권2호
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• pp.317-333
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• 2001

The equations of figures given by rectangular coordinates are used to look into the properties of them, which are very restricted in examining them in the school mathematics. Therefore, it is quite natural to consider the figures in terms of parameters without restriction to coordinates and also, it is possible for the students to analyze them. Thus, the visualization of figures is important for students in mathematics education. In particular, the teaching-learning methods using computers make loose the difficulties of geometry education, and from the viewpoint that various abstract figures can be visualized and that can be obtained by means of this visualization the learning of figures can be accomplished through the direct experience or control. This study is intended to present concretely the aim and its utility to visualize figures represented as parameters with Mathematics. In this paper, we introduce a new teaching-learning method of figures represented by parameters using Mathematica so that the learners establish themselves their knowledge obtained through their search, investigation, supposition and they accomplish the positive transition to advanced learning. So the leasers extend their ability of sensuous intuition to their ability of logical reasoning through their logical intuition. Consequently they can develop the ability of thinking mathematically, so many natural phenomena and physical ones.

• 한국수학교육학회지시리즈A:수학교육
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• 제54권1호
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• pp.83-98
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• 2015

By analysing the examination papers for geometry, we classified the errors occured in the proofs for geometric problems into 5 main types - logical invalidity, lack of inferential ability or knowledge, ambiguity on communication, incorrect description, and misunderstanding the question - and each types were classified into 2 or 5 subtypes. Based on the types of errors, answers of each problem was analysed in detail. The errors were classified, causes were described, and teaching plans to prevent the error were suggested case by case. To improve the students' ability to express the proof of geometric problems, followings are needed on school education. First, proof learning should be customized for each types of errors in school mathematics. Second, logical thinking process must be emphasized in the class of mathematics. Third, to prevent and correct the errors found in the proofs for geometric problems, further research on the types of such errors are needed.

• 한국멀티미디어학회논문지
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• 제5권4호
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• pp.351-360
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• 2002

하이퍼미디어 응용에 나타나는 다양한 형태의 멀티미디어 데이타와 이들 사이의 동기화 등을 지원하기 위해 하이퍼미디어 전자 문서의 기술 표준인 HyTime(Hypermedia/Time-based Structuring Language)이 사용되고 있다. 그런데 이러한 HyTime 문서를 효과적으로 관리하기 위해서는 HyTime문서의 논리적 구조 정보를 체계적으로 데이타베이스에 저장하여 여러 사용자가 공유할 수 있도록 관리할 필요가 있다. 본 논문에서는 하이퍼미디어 문서의 논리적인 구조를 정의하는 HyTime DTD(Document Type Definition)를 객체 지향 데이타베이스에서 체계적으로 관리하기 위해 메타 데이타베이스 스키마를 설계하고 이를 관리하는 방법을 기술한다.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2009년도 춘계학술대회
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• pp.281-286
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• 2009

The proposed technique uses cyclic frame structure, where three periods such as beacon period (BP), mesh contention access period (MCAP) and slotted period (SP) are in a data frame. This paper studies on a mechanism to allow communication nodes (6lowpan) in a PAN with different logical channel for global healthcare applications monitoring technology. The proposed super framework structure system has installed 6lowpan sensor nodes to communicate with each other. The basic idea is to time share logical channels to perform 6lowpan sensor node. The concept of 6lowpan sensor node and various biomedical sensors fixed on the patient BAN (Body Area Network) for monitoring health condition. In PAN (hospital area), has fixed gateways that received biomedical data from 6lowpan (patient). Each 6lowpan sensor node (patient) has IP-addresses that would be directly connected to the internet. With the help of IP-address service provider can recognize or analyze patient data from all over the globe by the internet service provider, with specific equipments i.e. cell phone, PDA, note book. The NS-2.33 result shows the performance of data transmission delay and data delivery ratio in the case of hop count in a PAN (Personal Area Networks).

• 수산경영론집
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• 제50권3호
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• pp.73-86
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• 2019

The purpose of this study is to provide logical and policy justification for the feasibility and sustainability of the project through analysis of economic ripple effects of the fishing village new deal 300 project. To do this, we applied the industry-related analysis, which is mainly used to analyze the economic ripple effects, to the fishing village new deal 300 project. The industry association analysis classifies the detailed project of the preliminary plan for the selection of the business into the software business such as the hardware business and the capacity enhancement in the construction field and analyzes the economic ripple effect through the inter-industry association. As a result, it is expected that the fishing village new deal 300 project will have a positive economic impact. When the total investment of 3 trillion won is invested in the project, it is estimated that the production inducement effect and the value added effect are 5,545.3 billion won and 2,102.7 billion won, respectively. In addition, 62,005 get job inducements, where 10,952 employment inducements were associated with job creation. The analysis of the above impacts seems to have secured the logical justification for the implementation of the fishing village new deal 300 project.