• Proceedings of the Korea Multimedia Society Conference
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• 2002.11b
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• pp.275-278
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• 2002

우리는 정보를 찾기 위해서 신문, 도서관보다는 인터넷을 먼저 검색한다. 이와 같은 사회환경에서 불건전 정보 증가는 이전 사회에서 인식하지 못했던 문제를 야기하고 있다. 그 대상이 청소년뿐만 아니라 아동까지 확대되고 있어, 문제는 더욱 더 커질 수 있다. 이러한 문제점을 극복하기 위해 본 논문에서는 연령별 또는 등급별 웹브라우저를 통하여 접근할 수 있는 범위를 제한하여 전문 검색 에이전트를 통하여 검색과 카테고리 분류를 하여 DB구축을 제안하고, 네트워크의 데이터링크 계층에 속하는 NIC(Network Interface Card)의 드라이버 수준에서 건전 사이트만을 접근이 가능하도록 폐쇄형 브라우저 시스템의 설계 및 구현방법에 대해서 논의한다.

• Journal of Internet Computing and Services
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• v.18 no.4
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• pp.69-78
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• 2017

We expect that the accredited certificate-based open banking, which is actively deployed in recent times, will solve the Galapagosization problem of the existing accredited certificate-based closed banking by supporting standard communication protocol and web compatibility. However, it is questionable how much the open banking will answer the security and usability problems of the existing closed banking. This paper is focused on analyzing the differences between the existing closed banking and the open banking, and then evaluates how much the security and usability problems of the existing closed banking are resolved by the open banking. The study firstly analyzes the security vulnerabilities raised in the process of providing closed banking services for the past 15 years or more, the countermeasures applied to enhance security, and the convenience impact of countermeasures. And then, the security and convenience of the open banking is inferred by analyzing the implementation difference between the closed banking and the open banking. The paper also briefly discusses how to improve the open banking to resolve the remaining problems of the open banking.

• Survey Research
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• v.18 no.4
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• pp.127-147
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• 2017

Despite the importance of questionnaires, little survey methodology research on questionnaire design has been conducted in Korea. The purpose of this study was to explore whether two questionnaire forms (close-ended vs. open-ended questions) about 'the most important problem in Korea' elicited similar responses. During the 2016 Korean General Social Survey (KGSS), a random half of respondents were asked the open-ended question form and the remaining half were asked the close-ended question form. While the economy is the most mentioned response (35% vs. 33.2%) to both close-ended and open-ended question forms, there is similarity in the order of highly mentioned responses if we consider that 'politics' is not provided as one of response categories in the close-ended question form. The order of second to fourth response category is crime (24.4%), education (15.4%), and poverty (6.3%) to the closed-ended question form, and politics (10.8%), crime (9.5%), and education (7.6%) to the open-ended question form. Also, the characteristics of respondents who responded with the economy as being the most important are slightly different between the two halves in terms of age, household income, and satisfaction with economic condition. Our findings suggest that we need to be careful when we adopt questions developed in other countries and to consider using survey experiments in pre-testing questionnaire items.

• Journal of the Korean School Mathematics Society
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• v.10 no.2
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• pp.221-235
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• 2007

Open problems can provide experiences for students to yield originative and various products in their level, because it is open with respect to its departure situation, goal situation, or solving method. Teachers need to pose and utilize open problems in forms of solution-finding or proving problems. For this we first have to specify which resource and method to use by concrete examples. In this article, we exemplify a method and procedure of posing an open problem by the two cases in which we pose open problems by reorganizing given closed problems. And we analyze students' responses for the two posed open problems. On the basis of these, we reflect implications for mathematical education of open problems.

• Proceedings of the Korean Statistical Society Conference
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• 2003.10a
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• pp.117-122
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• 2003

개방형 모집단에 대한 Mark-Recapture방법은 일반적으로 Jolly-Seber방법이 사용된다. 이 방법은 각 표본에서 모든 동물들에 대한 포획될 확률은 동일하다는 가정을 갖는다. 개방형 모집단에 대한 Mark-Recapture방법을 소개하고 폐쇄형 모집단에서 갖는 문제를 해결하기 위한 개방형 모집단의 로버스트 설계를 이용하려다. Pollock과 Kendall의 Jolly-Seber 모수로부터 유도된 모집단의 성장율 추정에 대하여 SAS와 POPAN의 결과를 비교하였다.

• Journal of the Korean School Mathematics Society
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• v.10 no.3
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• pp.303-322
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• 2007

This study is to investigate student's processes of problem solving using open-ended Geometric problems to understand student's thinking and behavior. One 8th grader participated in performing her learning in 5 lessons for June in 2006. The result of the study was documented according to Polya's four problem solving stages as follows: First, the student tended to neglect the stage of "understanding" a problem in the beginning. However, the student was observed to make it simplify and relate to what she had teamed previously Second, "devising a plan" was not simply done. She attempted to solve the open-ended problems with more various ways and became to have the metacognitive knowledge, leading her to think back and correct her errors of solving a problem. Third, in process of "carrying out" the plan she controled her solving a problem to become a better solver based on failure of solving a problem. Fourth, she recognized the necessity of "looking back" stage through the open ended problems which led her to apply and generalize mathematical problems to the real life. In conclusion, it was found that the student enjoyed her solving with enthusiasm, building mathematical belief systems with challenging spirit and developing mathematical power.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2009.11a
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• pp.345-348
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• 2009

오늘날 폐쇄형 IPTV 서비스 환경에서는 일방적인 콘텐츠 제공자로부터 생성 및 생성된 콘텐츠를 소비자가 일방적으로 소비하는 형태이다. 그러나 기존 디지털 콘텐츠의 유통 및 소비과정에서 콘텐츠를 보호하기 위한 각 제공 업체의 솔루션이 독자적인 방식으로 개발되어 이들 간의 호환성 문제가 발생한다. 본 논문은 IP 네트워크를 통해 소비자가 개인 방송 콘텐츠 사업자와 같이 멀티미디어 콘텐츠를 생성, 편집하고 고유한 방식으로 스타일대로 콘텐츠를 메타데이타와 함께 패키지 콘텐츠로 재가공하여 소비할 수 있을 뿐 아니라 재가공된 패키지 콘텐츠를 공유 또는 재판매 할 수 있게 하는 개방형 IPTV 서비스 환경에서의 패키지 콘텐츠의 실시간 스트리밍 및 주문형 서비스의 차별적 제공 방안을 제안한다.

• Journal of Navigation and Port Research
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• v.27 no.4
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• pp.383-388
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• 2003

.Ports are usually designed as a dead en port. With an increasing tendency of ship size, the problems such as maneuvering difficulty, turning basin, tugboat fee, etc. are getting to be pointed out. For solving such problem, the conversion of the idea fro dead end port to one-way through port is encourage. To examine the advantage of one-way through port, a quantitative and systematic analyzing procedure is needed. For this, this paper evaluated the preference on the three way of departture using the fuzzy measure and integral model.

• Information and Communications Magazine
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• v.32 no.7
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• pp.72-81
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• 2015

개방형 구조를 갖는 인터넷 기술의 불안전 특성으로 인하여 기업망은 별도의 폐쇄망 구조를 취할 수밖에 없었다. 그러나 디지털 기술 및 ICT 기술의 급격한 발전에 따라 기업의 경영환경 자체가 시공간을 초월하여 다양한 경영주체들과 불특정 다수의 고객들 간의 다이내믹한 네트워킹 환경을 요구하게 되었다. 이러한 이유로, 기업들은 인터넷의 불안정성이 해소되지 않는 상태에서 인터넷 상에서의 폐쇄성을 보장해야 하는 새로운 인프라의 도입이라는 당면문제를 자연스럽게 안게 된다. 폐쇄성을 부여하는 기술로 VPN(Virtual Private Network) 기술이 보편적으로 사용되어 왔으나 안전성을 보장하는 데는 한계가 있다. 본고에서는 폐쇄망의 속성을 인터넷 상에서도 그대로 유지하면서 사용하는 네트워크를 외부로부터 안전하게 보호할 수 있는 새로운 TIPN(Trust IP Networking) 기술 개념을 설명하고 이를 이용하여 엔터프라이즈 모바일 클라우드의 고신뢰화 방안을 제시한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.36 no.7C
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• pp.451-458
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• 2011

Maximally flat (MAXFLAT) FIR filter design provides the advantage of giving a closed-form solution, but there still remains a problem of exactly and efficiently choosing the order of flatness for the accurate design of filters. This paper provides, through the modeling and analysis of a frequency-domain error function in the closed-form solution, how to determine the order of flatness. A proposed method, based on the frequency-domain error function, is accomplished by computing a minimum distance between its peak frequency and specified cutoff frequency. It is also shown that the proposed scheme is computationally efficient and accurate than the empirical formula given by Herrmann.