• Journal of the Korea Society of Computer and Information
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• v.11 no.1 s.39
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• pp.195-201
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• 2006

This thesis proposes hybrid routing protocol that mix proactive routing protocol and reactive routing protocol used in Ad hoc network. Proposed method is that establish special node offering network service of nods which construct Ad hoc network and do routing different from existing hybrid routing protocol, ZRP. Special node doing these parts is called C-node. Routing using C-node can accompany efficient routing by decreasing path institution time and flooding time than existing routing protocol.

• Water for future
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• v.16 no.1
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• pp.41-48
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• 1983

The competition for water for municipal, industrial and agricultura and agricultural uses is growing keener as the world fooe and energy crises are intensifying. It is therefore becoming important how systems engineering techniques can be used to plan effectively for the future development of water supply and waste water management systems in a regional area. The feasible direction method and the out-of-kilter algorithm enable us to find the least-cost mix of alternative allocation networks. The interaction between land use patterns and urban water resources, and the environmental impact of alternative policies are discussed.

• 레미콘
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• no.7 s.68
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• pp.9-16
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• 2001

Execution of exposed concrete has some problems such as segregation, surface honey comb and insufficient surface flossing due to unsuitable mix proportion and unfavorable construction in our field. Therefore, in this paper, field application of exposed concrete at training center building of Chongju university in Daecheon are carried out based on the mixing data obtained from laboratory test. Base concrete are made in accordance with mixing data. Segregation reducing type superplasticizer developed are applied in order to flow the vase concrete with out segregation of materials. According to test results, air content shows to be reduced after flowing. Compressive strength of flowing concrete is higher than that of base concrete about 7%. Surface glossing is reducing as the age goes on. It is improved about 10% compared to that of vase concrete.

• Proceedings of the IEEK Conference
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• 2006.06a
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• pp.781-782
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• 2006

This treatise proposed environment for Embedded system's development. Virtual platform can help to solve problem that hardware designer can experience at design process of hardware. Compose circuit of most suitable that is verified before mix parts by various kinds method and compose circuit by board level because can do simulation with software and software that is optimized to hardware and offer flexibility that can test. Therefore, can shorten expense that is cost in development and time. Embody development platform for 8051 systems for verification of development platform, and compose and verified system in various kinds structure.

• Proceedings of the Korea Concrete Institute Conference
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• 2005.05b
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• pp.53-56
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• 2005

High flowable concrete was first developed in 1988 to achieve durable concrete structures. High flowable concrete can improve workability sharply reason why the concrete has properties of resistance to segregation, filling ability, passing ability without compacting. Therefore, as we apply a high flowable concrete to a large dimensional tunnel which constructed in special environment, we can get workability, strength and durability required. Tunnel lining concrete with a large dimension has to use necessarily fly ash and slag for the properties of high flowability and watertight. We can expect improvement of workability and durability, mitigation of hydration, reducing shrinkage, enhancement of watertight by using cementitious materials. This paper proposes investigations for establishing a mix-design method and high flowability-strength testing methods have been carried out from the viewpoint of making a standard concrete tunnel lining with large dimension a standard.

• Proceedings of the Korea Concrete Institute Conference
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• 2005.05b
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• pp.125-128
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• 2005

Coal ash, which is generated as a byproduct at a coal thermal power plant, can be classified into fly ash and bottom ash. Most of fly ash is recycled as an admixture for concrete, while bottom ash is not recycled but dumped into an ash landfill disposal site. So, if a technology for recycling bottom ash efficiently, which is increasingly generated year by year, is not developed, environmental problems will take place as a matter course and further an enormous economical cost will be required for construction of additional ash landfill disposal sites. In this study an optimum mix proportion design and a quality control method for utilizing the reclamation coal ash as an aggregate for secondary concrete products such as an artificial reef was successfully developed.

• Proceedings of the Korea Concrete Institute Conference
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• 2005.05b
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• pp.129-132
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• 2005

Reclamation coal ash, which is generated as a byproduct at a coal thermal power plant is not recycled but dumped into an ash landfill disposal site. Furthermore, various byproducts and wastes have been proposed for use from the point of reduction in the environmental load. Authors have started research to develope manufacturing technology of concrete mixture design method with large amount of land reclamation coal ash. In this study an optimum mix proportion design for utilizing the reclamation coal ash and containing copper slags as an aggregate for secondary concrete products such as a wave dissipating blocks was successfully developed.

• Proceedings of the Korea Concrete Institute Conference
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• 2008.04a
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• pp.717-720
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• 2008

This paper, an evaluation of the mechanical property for the backfilling materials of the NATM Composite lining tunnel using the lightweight foamed mortar, relates to the performance of permeability, compressive strength and unit volume weight. Therefore, this study is aimed to prove the three main factor that refered to the above line for development of new tunnel method. As the result of this study, it would be confirmed that the D mix is better than other mixs a side of all tests and its relation that is for the tunnel backfilling materials.

• Computers and Concrete
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• v.7 no.1
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• pp.17-38
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• 2010

This research aimed to investigate the influence of high-volume mineral admixtures (MAs), i.e., fly ash and slag, on the hydration characteristics and microstructures of cement pastes. Degree of cement hydration was quantified by the loss-on-ignition technique and degree of pozzolanic reaction was determined by a selective dissolution method. The influence of MAs on the pore structure of paste was measured by mercury intrusion porosimetry. The results showed that the hydration properties of the blended pastes were a function of water to binder ratio, cement replacement level by MAs, and curing age. Pastes containing fly ash exhibited strongly reduced early strength, especially for mix with 45% fly ash. Moreover, at a similar cement replacement level, slag incorporated cement paste showed higher degrees of cement hydration and pozzolanic reaction than that of fly ash incorporated cement paste. Thus, the present study demonstrates that high substitution rates of slag for cement result in better effects on the short- and long-term hydration properties of cement pastes.

• Journal of the Korean Home Economics Association
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• v.17 no.2
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• pp.10-29
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• 1979

Nowadays various organizations, such as hospitals, workers, students and families are requesting a model sample of standardized Korean meal plan to meet their nutritional requirement with daily food intake. Practical application of nutritional requirement in Korean meal is not yet established. This mainly comes form the lack of the research works on experimental cookery for the right amount of recipes of Korean meal , and no effect was ever paid for this angle by many specialist. Therefore, it is urgent to research and construct the standardized meal plan for Korean people. Contents of the present research are as follows ; 1) Standardization of recipes and the amounts : Various kinds of daily foods were selected for the purpose of recipes. The standardization of the recipes and the right amount were continuously attempted. 2) Research on the construction of nutritional meal plan : The method of constructing harmonious meal plan based upon the requirement, were studied. And the meal plans were constructed according to the different units of ages. Special meal plans were also constructed for the pregnant women and lactating women. 3) Evaluation for the nutritional adequacy were followed after the setting the various recipes.