• Journal of Industrial Technology
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• v.23 no.A
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• pp.47-53
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• 2003

차세대 웹 문서의 새로운 표준으로 자리 잡아 가고 있는 XML은 전자 상거래나 병원 관리 등과 같이 다양한 응용 분야에 적용되고 있다. 이러한 응용 분야는 XML 문서의 각 구성 요소 수준의 세밀한 액세스 제어를 요구한다. 따라서, 현재 XML 문서의 미세 접근 제어 기법에 대한 연구가 활발히 이루어지고 있다. 현재 제안된 XML 문서를 위한 미세 접근 제어 기법은 대부분 묵시적 권한 기법을 사용하여 상위 구성요소에 한번의 권한 부여로 하위노드에 권한을 부여하는 효과를 가지는 장점을 가지나, 각 구성 요소간의 권한을 체크하는 시간 오버헤드를 가지는 단점이 있다. 본 논문에서는 권한을 체크하는 시간을 감소시키기 위하여 XML 문서의 미세 접근 제어를 위한 명시적 권한 기법을 제안하고, 이를 이용하여 노드의 권한에 대한 모든 정보를 저장하고 있는 접근 권한 트리 모델을 제시하였다. 본 논문에서 제안한 접근 권한 트리 모델을 사용하면, 권한 정보를 저장하는 공간 오버헤드가 있지만, 권한 체크 시간을 감소시켜 사용자에게 보다 빠른 뷰를 제공할 수 있다.

• Journal of Korea Society of Industrial Information Systems
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• v.18 no.4
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• pp.81-87
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• 2013

Due to the development of IT technologies and the Internet penetration, the importance of Web accessibility has greatly increased and accordingly been studied a lot. This study noticed that the current evaluation algorithm for "Table Elements," which are used for data and layout tables, has many problems. Based on the Web Accessibility Guidelines, this study presents an improved evaluation algorithm for "Table Elements" and verifies its validity.

• Computational Structural Engineering
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• v.4 no.2
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• pp.9-12
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• 1991

공학문제에 있어서, 해석적으로 접근할 수 없었던 많은 경우의 문제들이 유한요소법(Finite Element Methods)의 정형화된 모형화 및 해석과정을 통하여 쉽게 접근되어질 수 있었다. 최근 보다 효율적인 요소개발과 컴퓨터 기술의 발달로 유한요소법은 더욱 효과적인 해석 수단이 되어가고 있다. 그러나 지반공학 문제와 같은 무한영역 문제를 유한요소법으로 해석할 경우, 매우 큰 영역을 모형화하기 위하여 많은 수의 요소가 요구되며 이에 따른 자유도(Degree of Freedom) 수의 증가로 많은 계산시간을 요구하게 된다. 본 고는 무한영역 문제를 효과적으로 모형화하기 위하여 연구, 개발되어진 무한요소(Infinite Element)에 대하여 소개하려 한다. 무한요소의 기본개념과 강성행렬의 형성방법을 보인 후, 기초공학 문제를 예로 하여 이의 적용방법을 간략하게 설명하였다.

• Convergence Security Journal
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• v.19 no.2
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• pp.129-136
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• 2019

The main tasks of commander and staffs in ground operations are a continuation performing the process of making decisions in various situations. Since the current decision-making process is largely dependent on qualitative methods, it is difficult to integrate with the decision-making tools associated with the 4th Industrial Revolution. The purpose of this study is to suggest the process of deriving the relative importance of the evaluation factors using the AHP with focusing on assessing the avenues of approach in IPB related to the ground operation plan. The most important aspect of IPB is the evaluation of the avenues of approach. Evaluation factors include target accessibility, observation and seasons, concealment and cover-up, ease of maneuverability, and ease of transition to adjacent access roads. The existing methods are the comparison method with evaluation factors and the analysis with the advantages and disadvantages. However, it has been criticized that they regard evaluation factors as equal importance. The results show that target accessibility has the highest score related with priority when considering the criteria.

• Informatization Policy
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• v.18 no.4
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• pp.42-58
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• 2011

This paper starts from one question: what are the key factors of the web accessibility policy, which is significant for realizing equity in the web and enhancing human dignity in the information society. To find significant factors for complying with web accessibility, this paper analyzes panel data of 16 Korean local governments (for five years: 2004-2009) according to the research design which is based on the demand and supply balance model and consists of four variables : 'legal and institutional environment (including legal infrastructure)', 'financial foundation (fiscal self-reliance ratio)', 'policy inputs (amount of imformatization budget, employee of information experts)'and 'policy demand (internet usage rate, the number of disabled people and elderly people)'. From the results of this study, this paper can explain the mechanism and impact factors on the web accessibility policy of Korean local governments. Some factors are critical to improve web accessibility: (1) the importance of policy demand, (2) the importance of policy inputs, (3) the importance of legal and institutional environment. Finally, this paper concludes with some suggestions to enhance the web accessibility capacity for Korean local governments: (1) improve awareness on web accessibility, (2) develop a standard and invest R&D on web accessibility, (3) foster experts in web accessibility.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.27 no.10C
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• pp.1015-1026
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• 2002

As per increasing research interest in the field of collaborative computing in recent year, the importance of security issues on that area is also incrementally growing. Generally, the persistency of collaborative system is facilitated with conventional authentication and cryptography schemes. It is however, hard to meet the access control requirements of distributed collaborative computing environments by means of merely apply the existing access control mechanisms. The distributed collaborative system must consider the network openness, and various type of subjects and objects while, the existing access control schemes consider only some of the access control elements such as identity, rule, and role. However, this may cause the state of security level alteration phenomenon. In order to handle proper access control in collaborative system, various types of access control elements such as identity, role, group, degree of security, degree of integrity, and permission should be taken into account. Futhermore, if we simply define all the necessary access control elements to implement access control algorithm, then collaborative system consequently should consider too many available objects which in consequence, may lead drastic degradation of system performance. In order to improve the state problems, we propose a novel access control framework that is suitable for the distributed collaborative computing environments. The proposed scheme defines several different types of object elements for the accessed objects and subjects, and use them to implement access control which allows us to guarantee more solid access control. Futhermore, the objects are distinguished by three categories based on the characteristics of the object elements, and the proposed algorithm is implemented by the classified objects which lead to improve the systems' performance. Also, the proposed method can support scalability compared to the conventional one. Our simulation study shows that the performance results are almost similar to the two cases; one for the collaborative system has the proposed access control scheme, and the other for it has not.

• Journal of the Korean association of regional geographers
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• v.21 no.1
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• pp.192-205
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• 2015

This study proposes a device for the organizational frameworks and essential (content) elements of world realms in world regional geography subject. Here, the term 'organizational framework' means the method of realms division, reasonable number and naming of realms, and approaches to reams inclusively. And the term 'essential elements' designate the core elements as big ideas that every student must study through world reams. To approach these thesis, the author suggests that there is a growing trend of a combined regional concept to apply for reams division, that it is necessary to rationalize the number of realms and to prepare rather a synthetic approach to realms than a single one. And then, the author presents five essential elements as big ideas of world reams that composed of four by thematic approach and one by global-issue approach. But, this study emphasizes that in organizing the essential elements for a realm it is a better strategy to bring elements selectively with a realm because certain element fulfils function specially to certain realm.

• Journal of the Korean Society for information Management
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• v.25 no.2
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• pp.25-48
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• 2008

The purpose of this study is to suggest retrieval interfaces for Korean paintings which support users to retrieve specific digitalized images of them through various access points and to widely browse based on unique features Korean paintings. The study, first, develops a set of descriptive elements suitable for Korean Paintings. Twenty-six core elements and one hundred seventy-two attributes are selected as descriptive items for Korean paintings based on the opinion of 8 experts. Then, to gam realistic evidence of what descriptive elements of image serve users as access points, it is investigated which elements are used as retrieval access points among 26 core elements by 300 peered users who are consisted with two groups such as common users and domain specialists. The study, in final, designs two(general and advanced) types of search interfaces and display interfaces based on the most popular top 15 descriptive elements. This access-enhanced platform which enables user-oriented searches will satisfy users in image retrieving.

• 한국HCI학회:학술대회논문집
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• 2007.02a
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• pp.1069-1074
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• 2007

청각장애인이 PC환경에서 영화, 방송, 애니메이션 등의 동영상 콘텐츠를 이용할 때 장애의 정도에 따라 콘텐츠의 접근성에 있어서 시각적 수용 이외의 부분적 장애가 발생한다. 이러한 장애의 극복을 위해 수화 애니메이션이나 독화 교육과 같은 청각장애인의 정보 접근성 향상을 위한 콘텐츠와 기술이 개발된 사례가 있었으나 다소 한계점을 가지고 있다. 따라서 본 논문에서는 현대 뉴미디어 예술 작품의 예술적 표현 방법을 구성요소로서 추출하여, 기술과 감성의 조화가 어우러진 독창적인 콘텐츠를 생산할 수 있는 기술을 개발함으로써 PC환경에서 청각장애인의 동영상 콘텐츠에 대한 접근성 향상 방법을 추출하고, 실질적으로 청각적 효과의 시각적 변환 인터페이스 개발 및 이미지 캡션 생성 소프트웨어 개발을 통해 청각장애인의 동영상 콘텐츠 사용성을 극대화시킬 수 있는 방법론을 제시하고자 한다. 본 논문에서는 첫째, 청각장애인의 동영상 콘텐츠 접근성 분석, 둘째, 미디어아트 작품의 선별적 분석 및 유동요소 추출, 셋째, 인터페이스 및 콘텐츠 제작의 순서로 단계별 방법론을 제시하고 있다. 이 세번 째 단계에서 이미지 캡션 생성 소프트웨어가 개발되고, 비트맵 아이콘 형태의 이미지 캡션 콘텐츠가 생성된다. 개발한 이미지 캡션 생성 소프트웨어는 사용성에 입각한 일상의 언어적 요소와 예술 작품으로부터 추출한 청각 요소의 시각적요소로의 전환을 위한 인터페이스인 것이다. 이러한 기술의 개발은 기술적 측면으로는 청각장애인의 다양한 웹콘텐츠 접근 장애를 개선하는 독창적인 인터페이스 추출 환경을 확립하여 응용영역을 확대하고, 공학적으로 단언된 기술 영역을 콘텐츠 개발 기술이라는 새로운 영역으로 확장함으로써 간학제적 시도를 통한 기술영역을 유기적으로 확대하며, 문자와 오디오를 이미지와 시각적 효과로 전환하여 다각적인 미디어의 교차 활용 방안을 제시하여 콘텐츠를 형상화시키는 기술을 활성화 시키는 효과를 거둘 수 있다. 또한 청각장애인의 접근성 개선이라는 한정된 영역을 뛰어넘어 국가간 언어적인 장벽을 초월할 수 있는 다각적인 부가 동영상 콘텐츠에 대한 시도, 접근, 생산을 통해 글로벌 시대에 부응하는 새로운 방법론으로 발전 할 수 있다.

• Environmental and Resource Economics Review
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• v.23 no.3
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• pp.453-472
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• 2014

Analyzing the effects of carbon emissions trading, which is scheduled to be introduced in Korea in 2015, requires an accurate assessment of $CO_2$ abatement costs by both industries and firms. Firms faced with regulatory constraints are unlikely to minimize their production costs due to rising production costs caused by allocative inefficiency of inputs. The use of a distance function would results in underestimation of $CO_2$ abatement costs, because it fails to capture the allocative distortion costs. Recognizing the disadvantage of the previous approach, first, this paper tests for allocative efficiency of input for the Korean steel industry over the period 1990-2010, then derives the marginal $CO_2$ abatement costs by applying a cost function approach. The hypothesis of allocative efficiency in inputs is rejected and the steel industry pays an annual average cost of 92,000 won in removing an additional ton of $CO_2$ over the sample period.