• ETRI Journal
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• v.39 no.3
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• pp.345-352
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• 2017

Traffic management is a highly beneficial mechanism for satisfying quality-of-service requirements and overcoming the resource scarcity problems in networks. This paper introduces an optimal connection admission control mechanism to decrease the packet loss ratio and end-to-end delay in cognitive radio sensor networks (CRSNs). This mechanism admits data flows based on the value of information sent by the sensor nodes, the network state, and the estimated required resources of the data flows. The number of required channels of each data flow is estimated using a proposed formula that is inspired by a graph coloring approach. The proposed admission control mechanism is formulated as a semi-Markov decision process and a linear programming problem is derived to obtain the optimal admission control policy for obtaining the maximum reward. Simulation results demonstrate that the proposed mechanism outperforms a recently proposed admission control mechanism in CRSNs.

• Journal of Advanced Marine Engineering and Technology
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• v.33 no.4
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• pp.517-523
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• 2009

Magnesium alloys have many advantages such as a low density, high strength/weight ratio and well recycle. And joining process is absolutely necessary to expand the field of application of magnesium alloy. The main problems of conventional process such as arc welding for magnesium alloy are the inflammability, a tendency toward crack formation and the appearance of porosity during solidification. Laser welding technology is a promising means for overcoming these difficulties. This study is related to the laser weldability of AZ31 magnesium alloy, an all-purpose wrought alloy with good strength and ductility. The effect of welding conditions on the weldability of butt joints was examined. Also, the mechanical properties of butt welded joints were investigated by tensile test and hardness test.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.18 no.36
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• pp.323-331
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• 1995

The role of equipment maintenance in manufacturing becomes important. As a method of overcoming this problems, diagnostic expert system has been introduced. If such a system is, however, based on the troubleshooter's knowledge, many difficult cases are occured in the real process of diagnosis using that kind of system. This paper suggests to use the designer's knowledge for diagnosing the malfunctions of production equipments. To do that, a method of knowledge represen-tation is also proposed, which is based on the concept of boundary factors. In addition, the disorder propagation in considered. As a results, one can simplify the process of reasoning and inspection.

• Health Policy and Management
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• v.2 no.2
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• pp.90-111
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• 1992

Community involvement is to be the keystone of primary health care, Unfortunately, efforts to promote it failed in many countries. Author inquired into the reasons why such efforts fail, and the alternative strategies for effectively promoting it in Korean situation today. In doing so, the concept of community involvement is clarified as an amalgamation of two different concepts; one is that of the community development, and the other is that of approaches for overcoming the alienation of the people from the health care process. Stategies of community involvement in Korea so far followed the line of the community development, e.g. village health worker. It loses, however, the feasibility as Korea has experinced so cial and economic developpment. The strategies of the second line of thought is now more feasible; empowering the people by providing more information and enhancing comitment to health, improving acceptabilty of community involvemt on the part of the health professionals and the bureaucrats, and building the mechanism of community involvement into the health policy-making process.

• Journal of Forest and Environmental Science
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• v.26 no.2
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• pp.137-148
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• 2010

The high costs for ethanol production with lignocellulosic biomass as a second generation energy materials currently deter commercialization of lignocellulosic biomass, especially wood biomass which is considered as the most recalcitrant material for enzymatic hydrolysis mainly due to the high lignified structure and the nature of the lignin component. Therefore, overcoming recalcitrance of lignocellulosic biomass for converting carbohydrates into sugar that can subsequently be converted into biobased fuels and biobased products is the primary technical and economic challenge for bioconversion process. This study was mainly reviewed on the research trend of the enhancement of enzymatic hydrolysis for lignocellulosic biomass after pretreatment in bioethanol production process.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2021.10a
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• pp.464-466
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• 2021

Currently, most companies have security solutions such as firewalls or WAF (Web Application Firewall) for web services, cloud systems, and data centers. Recently, as the need for remote access increases, the task of overcoming the security vulnerabilities of remote access control is becoming more important. In this paper, the concept of the network security model from the perspective of zero trust and the strategy and security system using it will be reviewed.

• School Mathematics
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• v.1 no.1
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• pp.123-133
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• 1999

For an appropriate assessment in mathematics, students should play an active role in their learning by becoming aware of what they have learned in mathematics and by being able to assess their attainment of mathematical knowledge. The process of actively examining and monitoring students' own progress in learning and understanding of their mathematical knowledge, process, and attitude is called self-assessment, Researchers in mathematics education have found some important facts about the meta-cognitive process which is related to self-assessment : i. e. meta-cognition progress is composed of being aware of ones' own personal thinking of content knowledge and cognitive process(self-awareness) and engagement in self-evaluation. Tipical method for self-assessment in mathematics developed upon above finding about meta-cognitive progress is describing about students' knowledge and their problem solving strategies. In the beginning of the description in mathematics about themselves, students are required to answer which part they know and which part they don't know. Self-assessment of students' attitudes and dispositions can be just as important as assessment of their specific mathematical abilities. To make the self-assessment method a success, teachers should let students' have confidence and earn their cooperation by let them overcoming fear to be known the their ability to other students. In conclusion, self-assessment encourages students to assume an active role in development of mathematical power. For teachers, student self-assessment activities can provide a prism through which the development of students' mathematical power can be viewed.

• Korean Institute of Interior Design Journal
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• v.22 no.5
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• pp.199-206
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• 2013

Design is one of diverse human communication activities. Development of technologies has led to execution of more active design communication functions, stirring social and cultural changes. The concept of design communication has become stronger by overcoming the limitations of verbal communication and expanding the methods of communication. These social changes are highlighted In the design of modern space. Even though communication in interior design activities is so important, detailed studies on communication of each entity are still very insufficient. Design communication refers to tools and activities for overall communications in the design process. In design activities, relevant communication is indispensible. Therefore, studies on practical communication methods are essential for accurate communication of content that has to be shared in the results or in the process of obtaining the results, rather than only focusing on the future techniques and functions of design. In other words, improving the efficiency of interior design communication requires establishing a communication relationship structure of each entity, which calls for proper expression methods depending on each entity. Therefore, this study is aimed at exploring efficient expression methods in line with the relationship structure of each entity in the interior design process.

• Korean Institute of Interior Design Journal
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• v.15 no.1 s.54
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• pp.3-11
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• 2006

After the 60's, The discourse of the Art of Reception, semiotics, and epistemology have been made steady progress. Especially, the Art of Reception which emphasizes the role of reader in the process of understanding the text, had made the significant role of the Border Dismantling in the Architecture. Its concept can be difined as the free interpretation of each individuals on the art works, that abhors the one-directional systems between reader and writer. This study analyzes the meaning of 'Borderness dismantling' as a molting the center of the world of God, center of Ideology, center of ration in the pluralized and center-cracked world. and also means vague border, no limitation, and overcoming, which make people participate together to overcome the estrangement. The process of study inquire into the phenomenon of fragmentization, indeterminacy, continuitiness, hybridization, mutual penetration, Rhizome and complex allegorization(the process of humanization) Looking back of architectural history, in the origin of those phenomenon, there is the etching works of Piranesi. Many contemporary architects had been affected by his works, and re-interpret and make come true of his visions. This study analyze the meanings of his working process and consequences on contemporary architecture.

• Journal of the Institute of Electronics Engineers of Korea TE
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• v.39 no.3
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• pp.15-20
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• 2002

In this paper, the method of processing a blurred noisy signal has been researched. The conventional method of processing signal has faults, which are slow-convergence speed and long time-consuming process at the singular point and/or in the ill condition. There is the process, the Gauss-Seidel's method to remove these faults, but it takes too much time because it processes signal repeatedly. For overcoming the faults, this paper shows a signal process method which takes shorter than the Gauss-Seidel's by comparing the Gauss-Seidel's with proposed algorithm and accelerating convergence speed at the singular point and/or in the ill condition.