• Journal of the Korea Society of Computer and Information
• /
• v.11 no.5 s.43
• /
• pp.127-137
• /
• 2006

We propose two phase filtering scheme to develop an efficient mechanism for XML databases to control query-based access. An access control environment for XML documents and some techniques to deal with fine-grained authorization priorities and conflict resolution issues are proposed. Despite this, relatively little work has been done to enforce access controls particularly for XML databases in the case of query-based access. The basic idea utilized is that a user query interaction with only necessary access control rules is modified to an alternative form through a query optimization technique, which is guaranteed to have no access violations using tree-aware metadata of XML schemas. The scheme can be applied to any XML database management system and has several advantages such as small execution time overhead, fine-grained controls, and safe and correct query modification. The experimental results clearly demonstrate the efficiency of the approach.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2013.10a
• /
• pp.150-153
• /
• 2013

By the development of IT, most business has been processed on the IT solution-based servers has increased Therefore, the importance of security of the server is highlighted. And the need for password management server efficient and safe is raised. There is a need to change at least 8 characters to mix the numbers and letters and password change passwords on a regular basis, you need a password for each system account is set in a different way, but the continuation of the system there is a tendency to password problems occur problems caused by the limits of the introduction of human resources and introduction basis occurs. The password management feature, though it is expensive is partially providing integrated access control solutions at home and abroad, there is a drawback that stresses the traffic on the server. Future, we conducted a study of password management solutions for the server of the server is determined IT transformation trend of non-IT field to accelerate, is continuously increasing it accordingly.

• Journal of the Korea Society of Computer and Information
• /
• v.13 no.1
• /
• pp.203-212
• /
• 2008

Currently the problem that cannot attempt convenience anger to inner user and people has been stated in a National Police Agency(NPA) informatization system administered Executed an inquiry regarding users inner the our country NPA after analyzing Hint point a foreign NPA IT informatization organization decreasing by and analyzed improvement Point to measures regarding this problem at these papers, and derived from an efficient strategic plan for NPA informatization integration. As set up informatization vision of NPA and a goal, To utilize so that design a model integrated inforrnatization for advanced a business assistance system of the NPA where these results are objective for the people enhancement, and keep connection with other organization in its mind, and can accomplish a quality elevation of NPA information business. and expect as present improvement plan for efficiency of NPA information business.

• Journal of Environmental Policy
• /
• v.8 no.3
• /
• pp.139-162
• /
• 2009

This paper confirms previous results indicating that the expenditure elasticity of demand for polluting goods plays an important role in achieving efficiency gains from tax reforms. Moreover, this paper finds that the results of the tax reforms depend not only on the size of the expenditure elasticity for the polluting goods but also on the relative size of the expenditure elasticities between polluting goods and clean goods. It also shows that in order to enhance the overall tax efficiency by the environmental tax reform, the expenditure elasticity of demand for clean goods should be larger than that of polluting goods. The result implies the following policy suggestion: When the tax authority considers green tax reforms, the expenditure elasticities should not be neglected to achieve gains in the overall efficiency of the tax system.

• Journal of the Korea Society of Computer and Information
• /
• v.17 no.6
• /
• pp.191-199
• /
• 2012

By the way, in light of the knowledge, even public institutions are paying much attention to the management of IT assets for achieving organizational goals. Recently, some public institutions adopt balanced scorecard for enhancing efficiency in operations and management of total administrations. To be interested, some key performance indicators(KPI) of the balanced scorecard reflect the three aspects of IT assets and their possible outcomes. The main focus of this study is to investigate whether there is positive effects of IT asset management through balanced scorecard at public institutions. Specifically, we selected and classified KPIs into different categories depending on three aspects of IT assets, internal process change, and organizational outcomes. To address relationships of KPIs among the categories, we specified each category and developed as a variable respectively. A middle-sized city provided us with 138 KPIs for the development of scales.

• Journal of Korea Port Economic Association
• /
• v.28 no.3
• /
• pp.1-25
• /
• 2012

In order to solve the current problems and inefficiencies within the Port Authorities (PA) in Korea, this study introduces the concept of the integration of PA and analyses the awareness of intention of integration. This study is based on analysing the surveys conducted by the members of PA. This research shows that there were different perceptions on the autonomy, business strategy intension, information sharing efficiency, competition, environment and technique change, capital finance, easy finance risk, curtailment of expenditure, personnel management efficiency in PA. Results of the study indicate that YGPA has more clear understanding on the awareness of integration of PA than other PAs. The results of this research will serve as a basic literature for further studies on the integration of PA in Korea. Moreover, the problems that have been identified and analysed in this study will contribute to establishing the strategy for further development of PA in Korea.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.33 no.5B
• /
• pp.243-252
• /
• 2008

In this paper, we propose the next-generation broadband wireless access network architecture, which is based on the wavelength division multiplexing-passive optical network(WDM-PON), and efficient mobility management scheme to support quality-of-service(QoS) of multimedia services in the next-generation wireless network. By adapting WDM-PON technology to wireless access network, the proposed scheme can realize broadband wireless access network. In addition, We utilize newly proposed local channels between optical network units(ONUs) or subnets in order to support the fast and efficient local data and handoff data transmission. We evaluate the performance of the proposed scheme in terms of handoff delay and packet loss thru computer simulation. Thru various computer simulation results, we verified the superior performance of the proposed scheme by comparing with the results of other schemes.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.12 no.2
• /
• pp.640-645
• /
• 2011

The purpose of this article is to investigate ways of making the cloze test more valid as an English proficiency test so that it can provide a better format for the cloze test especially to the non-native teachers in EFL environments. This investigation identifies ways of validity in terms of materials, deletion rates, item characteristics and scoring methods used in cloze tests. An increase in test validity can be accomplished by knowing how the four factors affect the cloze test results and how to manipulate them. Practical suggestions are provided for teachers to design a cloze test. Teachers can develop the reliability and validity of cloze tests by manipulating the four factors. In seeking a more valid and reliable cloze format, this research gives some suggestions based on a literature review. We can conclude that a cloze test can be valid only when teachers are aware of the factors which affect the test result and the ways to handle the factors to make the test appropriate for their test purposes.

• The KIPS Transactions:PartB
• /
• v.8B no.1
• /
• pp.105-113
• /
• 2001

최근 축약 분산 기억 장치(SDM)가 적응적 문제 해결 능력과 하드웨어화의 용이성으로 인해 현실성이 있는 신경망의 한 모델로 제안되었다. 그러나 다층 인식자의 개별 뉴런이 선형 또는 비선형 결정 함수로 해 공간을 이분하고 그들이 다양하게 결합함으로써 일반적인 문제 해결 능력을 갖는데 비해, 축약 분산 기억 장치의 뉴런은 해 공간에서 자신을 중심으로 한 일정 반경 영역을 안과 밖으로 이분하고 이들을 단순하게 합하므로써, 해 공간이 실수 공간과 같이 크기 관계를 갖는 경우 비효율적인 모델로 된다. 본 논문에서는 이러한 축약 분산 기억 장치의 특성과 그 원인을 규명하고, 문제의 해 공간이 단조 증가 또는 감소 결정 함수로 양분되는 경우, 기존의 축약 분산 기억 장치에 크기 비교 과정을 도입함으로써, 주어진 문제를 효율적으로 해결할 수 있는 수정된 축약 분산 기억 장치 모델을 제안한다. 아울러 제안된 모델을 ATM망에서의 호 수락 제어 과정에 적용한 예를 보인다.최근 축약 분산 기억 장치(SDM)가 적응적 문제 해결 능력과 하드웨어화의 용이성으로 인해 현실성이 있는 신경망의 한 모델로 제안되었다. 그러나 다층 인식자의 개별 뉴런이 선형 또는 비선형 결정 함수로 해 공간을 이분하고 그들이 다양하게 결합함으로써 일반적인 문제 해결 능력을 갖는데 비해, 축약 분산 기억 장치의 뉴런은 해 공간에서 자신을 중심으로 한 일정 반경 영역을 안과 밖으로 이분하고 이들을 단순하게 합하므로써, 해 공간이 실수 공간과 같이 크기 관계를 갖는 경우 비효율적인 모델로 된다. 본 논문에서는 이러한 축약 분산 기억 장치의 특성과 그 원인을 규명하고, 문제의 해 공간이 단조 증가 또는 감소 결정 함수로 양분되는 경우, 기존의 축약 분산 기억 장치에 크기 비교 과정을 도입함으로써, 주어진 문제를 효율적으로 해결할 수 있는 수정된 축약 분산 기억 장치 모델을 제안한다. 아울러 제안된 모델을 ATM망에서의 호 수락 제어 과정에 적용한 예를 보인다.

• Journal of Wetlands Research
• /
• v.12 no.2
• /
• pp.67-73
• /
• 2010

This study was performed to figure out what would be effective to maintain good water quality in the retention pond which was badly polluted before. In order to keep the good water quality of the retention pond it is necessary to prevent outer non-point source pollutants from flowing into the pond. In this study, we proposed to use porous slag as a blockage of the inflow into the pond from external non-point sources. We experimented with porous slag nets to see how the water is effected. With the results of the experiments, we found out there is a close correlation($r^2=0.9765$) between contact time and the removal rate of phosphorus, therefore we can conclude that contact time affects removal rate greatly. Synthetic wastewater, activated sludge effluent, and sewage were passed through a porous slag packed bed, both phosphorus and the suspended solid in water were removed highly. With the results of these tests, we proposed to set up a porous slag packed bed inside of the retention pond and revetment to prevent external non-point source pollutants flowing into the retention pond.