• Proceedings of the Korea Information Processing Society Conference
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• 2011.04a
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• pp.901-904
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• 2011

SaaS 환경에서는 다수의 사용자가 동일한 어플리케이션을 이용하게 되므로 사용자에 따라 특정 자원 혹은 기능에 대한 접근을 제어하는 보안 기능의 중요성이 더욱 부각되고 있다. 이러한 기능을 갖춘 SaaS 플랫폼의 중요성과 그 가치는 매우 크다 할 수 있으나 국내에서는 이에 대한 많은 연구가 보이지 않고 있다. 본 논문에서는 계층적 그룹 구조, 접속 시간 IP 주소 MAC ID 등에 따른 역할 부여 등 풍부한 기능을 제공하는 SaaS 플랫폼을 위한 사용자 권한 관리 시스템을 설계한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2007.05a
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• pp.1121-1124
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• 2007

정보시스템에서 자원에 대한 접근 통제는 핵심 보안기술의 하나다. 최근에는 역할을 중심으로 접근을 제어하는 RBAC모델이 웹 어플리케이션에 널리 활용되고 있으나, 대규모 기업이나 분산 환경 조직에서는 다수의 사용자, 역할과 상호관계로 인해 관리에 상당한 노력이 요구되고 있다. 본 논문에서는 조직의 구조를 반영한 역할 관리 모델(OS-RBAC)을 기반으로 사용자와 역할과의 할당 관계에 그룹Groups)이라는 개념을 추가한 전자영사시스템의 접근제어 모델을 구현함으로서 역할관리의 효율성을 제고하였다.

• The KIPS Transactions:PartA
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• v.13A no.1 s.98
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• pp.27-34
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• 2006

Designers should know CAD tool/license information such as available number of licenses or tools, types, and configuration methods to use CAD tools properly in their group. Usually, this information is provided by managers who administrate CAD tool and license servers in the specific design group. In the previous CAD tool/licenses sharing methods, designers have to get CAD tool/license information manually and setup the environments with their own hands. n a new designer comes into the design working group, the designer wastes unnecessary design time, because of these processes. As a result, designer's poductivity and utilization of CAD tools will decrease Besides, managers also waste their time and effort, since they should provide CAD tool/license information manually to each designer. In this paper, we present an automated scheme to share CAD tool/license information based on directory service. The proposed methods automate the communication processes between managers and designers that minimze unnecessary time to share CAD information. In addition, as this system maintains the consistency of CAD information automatically that remove the repeated work of managers and designers, it improves the enciency of sharing. Besides, it automates the license configuration steps using prof(y Last, we offer Executable Proxy which is proper for thin CAD application. We believe this scheme will reduce designers and managers' time and effort as well as maximize the utilization of CAD tools.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.21 no.5
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• pp.974-983
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• 2017

In this paper, we have discussed the search function that can be embedded and used on Android-based applications. We used BM25 to suppress insignificant and too frequent words such as postpositions, Pivoted Length Normalization technique used to resolve the search priority problem related to each item's length, and Rocchio's method to pull items inferred to be related to the query closer to the query vector on Vector Space Model to support implicit feedback function. The index operation is divided into two methods; simple index to support offline operation and complex index for online operation. The implementation uses query inference function to guess user's future input by collating given present input with indexed data and with it the function is able to handle and correct user's error. Thus the implementation could be easily adopted into smartphone applications to improve their search functions.

• Journal of Internet Computing and Services
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• v.8 no.2
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• pp.33-41
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• 2007

With the development of the multicast technology, the realtime strategy among the group applications using the multicast routing is getting more important. An essential factor of these real-time application is to optimize the Delay- and delay Variation-Bounded Multicast Tree(DVBMT) problem. This problem is to satisfy the minimum delay variation and the end-to-end delay within an upper bound. The DVBMT problem is known as NP-complete problem. The representative algorithms for the problem are DVMA, DDVCA, and so on. In this paper, we show that the proposed algorithm outperforms any other algorithm. The efficiency of our algorithm is verified through the prerformance evaluation and the enhancement is up to about 9% to 29% in terms of the multicast delay variation. The time complexity of our algorithm is $O(mn^2)$M.

• The Journal of the Korea Contents Association
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• v.21 no.11
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• pp.1-10
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• 2021

This study analyzes the use and meaning of consumer personality implication words in the review text of the Used Transaction Application . From of May 2021, the data were collected for the past six months by our Web crawler in Seoul and Gyeonggi Province, and a total of 1368 cases were collected first by random sampling, and finally 570 cases were preprocessed. The results are as follows. First, 48.2% of review texts were related to the personality of consumers even though it was a commercial platform of products. Second, the review text is mainly positive, which formed a text network structure based on the keyword 'gratitude'. Third, the review text, which implies consumer character, was divided into two groups: 'extrovert personality' and 'introvert personality' of consumers. And the individuality of the two groups worked together on the platform. In conclusion, we would like to suggest that consumer personality plays an important role in the platform transaction process, that consumer personality will play a role in the services of the platform in the future, and that consumer personality should be studied from various perspectives.

• Journal of the Institute of Electronics and Information Engineers
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• v.51 no.4
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• pp.160-172
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• 2014

Although Wyner-Ziv (WZ) video coding proves useful for applications employing encoders having restricted computing resources, the WZ decoder has a problem of excessive decoding complexity. It is mainly due to its iterative LDPC channel decoding process which repeatedly requests incremental parity data after iterative channel decoding of parity data received at each request. In order to solve the complexity problem, we divide bit planes into two groups and estimate the minimum required number of parity requests separately for the two groups of bit planes using bit plane correlation. The WZ decoder executes the iterative decoding process only after receiving parity data corresponding to the estimated minimum number of parity requests. The proposed method saves about 71% of the computing time in the LDPC decoding process.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.7
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• pp.4554-4561
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• 2014

In recent years, several paradigms have been identified to simplify the design of fault-tolerant distributed applications in a conventional static system. Leader Election is among the most noticeable, particularly because it is closely related to group communication, which provides a powerful basis for implementing active replications among other uses. On the other hand, despite its usefulness, to our knowledge, no study has focused on this problem in a mobile computing environment. The aim of this paper was to propose an algorithm for the leader election protocol in a fixed station based wireless networks environment. The election algorithm is much more efficient than other election algorithms in terms of the fault tolerance.

• Proceedings of the Korean Information Science Society Conference
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• 2011.06a
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• pp.108-111
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• 2011

최근 스마트폰을 이용하여 위치, 움직임, 주위 환경 정보 등과 같은 사용자의 상황을 인지하고, 인지한 컨텍스트를 기반으로 어플리케이션이 능동적으로 기능을 제공하기 위한 연구가 활발하다. 그러나 현재 켠텍스트 인지 모바일 어플케이션에서는 단일 사용자의 현재 컨텍스트에 국한되어 컨텍스트를 활용하고 있다. 본 논문에서는 제안하는 컨텍스트 Visualizer에서는 포괄적인 컨텍스트 정보의 활용을 위해 컨텍스트 정보를 개인, 그룹별로 분류하여 보여준다. 또한, 과거, 현재, 미래 컨텍스트 정보를 고려하여 화면에 보여줌으로써 컨텍스트의 활용 범위를 향상시킨다. 이를 위하여 온 논문에서는 모바일 컨텍스트 종류를 설명하고, 이를 보여주기 위한 컨텍스트 Visualizer의 설계를 제시한다. 또한 설계 모델을 기반으로 구현한 프로토타입을 보여주고, Visualizer의 활용을 제시함으로써 연구의 실효성을 보여준다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2015.05a
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• pp.170-171
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• 2015

At the present time it continues to be the smart device released has also been commercialization device accessories accordingly. Such accessories are getting great response to consumers in the form of an external device to a character commercialization design. However, these products are not useful in the functional aspects of using the external form of the device is concentrated only. This study documents the management app to give the game character acts on the application category grouping the ability to efficiently manage the smart device. Research method is to study the existing product released to find out how it works come from the smart device management side, The device app management features added to the game play will be produced based on them.