• Proceedings of the Korean Society of Precision Engineering Conference
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• 2011.06a
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• pp.1443-1444
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• 2011

• Transactions of the Korean Society of Mechanical Engineers
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• v.5 no.2
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• pp.151-157
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• 1981

The concept of available evergy has been adopted in terms of effectiveness for and evaporator of vapor power cycle. This kind of practice is emphasezed in a case of heat and power cogeneration in order to find optimum condition for the energy utilzation of the exhaust gas. It has beed shown that the optimum condition can be given in terms of the saturation pressure or the saturation temperature of the working fluid. Similar method has been applide to show that the effectiveness is increased asymptotically with the number of evaporator stanges.

• Journal of The Korea Institute of Healthcare Architecture
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• v.11 no.2
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• pp.27-36
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• 2005

A ward is a place where the patients are living and staying for 80% of the all those days in the hospital. So the Ward's conditions are very important to them. We group a ward's conditions in two classes, one in the physical condition ; area, noise, temperature etc. and the others is the physical condition ; privacy, field. According to the analysis, the patients had beed under a mental stress and they did negative action, by the ward's environmental conditions. This study find influence of the ward's environmental conditions with violate each patients privacy using multi-bedroom's restroom. So we suggest that the ideal multi-bedroom's restroom, solve the they got the problems.

• Proceedings of the Korea Concrete Institute Conference
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• 1999.04a
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• pp.537-542
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• 1999

The design methodologies for carbon fiber sheet(CFS) strengthening of RC structures are not well established yet because the structural behavior of strengthened RC structures is more complex than that of unstrengthened ones. Even though the research for the methods using CFS has beed studied, the strengthening effects and structural behaviors of strengthened structures are not systematized yet. The purpose of this study is to carry out the experimental studies on three kinds of half scale RC slab bridges and to investigate the behavior of RC slab bridges from the experimental results. Typical flexural failure occurs in the non-strengthening slab like general RC slab bridges, and also the flexural failure occurs in the all area strengthened slab with sudden rip-off failure of strengthening material by punching shear. For the case of strip type strengthened slab, flexural failure occurs, with rip-off of second strip at the base of loading point. Strengthening effect on the slab using CFS is that the strength is increased upto 7~15 percent and the crack pattern is changed.

• International journal of advanced smart convergence
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• v.5 no.3
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• pp.8-15
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• 2016

In recent years, one of deep learning models called Deep Belief Network (DBN) which formed by stacking restricted Boltzman machine in a greedy fashion has beed widely used for classification and recognition. With an ability to extracting features of high-level abstraction and deal with higher dimensional data structure, this model has ouperformed outstanding result on image and speech recognition. In this research, we assess the applicability of deep learning in dna classification level. Since the training phase of DBN is costly expensive, specially if deals with DNA sequence with thousand of variables, we introduce a new encoding method, using decimal-binary vector to represent the sequence as input to the model, thereafter compare with one-hot-vector encoding in two datasets. We evaluated our proposed model with different contrastive algorithms which achieved significant improvement for the training speed with comparable classification result. This result has shown a potential of using decimal-binary vector on DBN for DNA sequence to solve other sequence problem in bioinformatics.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.25 no.2
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• pp.228-234
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• 2001

To obtain precise machined surface and high productivity in machining, high speed end milling has beed studied recently. Though high speed end milling is explicitly effective for precision surface generation geometrically, tool deflection, chatter vibration and frequency characteristics of end milling system deteriorate the theoretical surface. In this study, simulation algorithm and programming method are suggested to simulate machined surface using acceleration signal in high speed end milling. This simulation is conducted by considering vibrational effect of spindle system which was not considered by other investigators. Good agreements were obtained between simulated results and experimental results.

• 한국신재생에너지학회:학술대회논문집
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• 2009.11a
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• pp.143-146
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• 2009

The metal-supported SOFC has beed developed as a new concept of SOFC which has higher mechanical strength. However, the mass transfer rate in this type of SOFC may be decreased due to the contact layer and the support layer and that can cause the low performance. Therefore, numerical analysis of the heat and mass transfer characteristics in a metal-supported solid oxide fuel cell(SOFC) is studied in this paper. Governing equations and electrochemical equations are calculated simultaneously. And the numerical results are compared with the experimental results for the code validation. The current density, temperature, and pressure drop are suggested as numerical results.

• Journal of Welding and Joining
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• v.18 no.6
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• pp.55-61
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• 2000

Dynamic monitoring of weld pool formation and seam deviations using infrared vision is described in this paper. Isothermal contours representing heat dissipation characteristics during the process of arc welding were analysed and processed using imaging techniques. Maximum bead width and penetration were recorded and the geometric position in relation to the welding seam was measured at each sampling point. Deviations from the desired bead geometry and welding path were sensed and their thermographic representations were digitised and welding path were sensed and their thermographic representations were digitised and subsequently identified. Evidence suggested that infrared thermography can be utilized to compensate for inaccuracies encountered in real-time during robotic arc welding.

• Journal of Information Technology Services
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• v.10 no.1
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• pp.191-209
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• 2011

The purpose of this research is to develop a service R&D concept definition and finding service R&D demand in Korea. It is necessary to develop an effective service R&D model to improve the competitiveness of the service industry. A survey model for finding service R&D demands has been developed through extensive discussions with experts. A demand survey for 91 experts in service industry and academia has been conducted to find relative weights of each service R&D category. Several other aspects on service R&D has beed investigated to analyze the relative importance of service R&D subjects. And a benchmarking on previous service R&D research investment has been performed. Past and present service R&D topics are compared as a whole and by each individual domain. A service R&D framework and important funding areas has been suggested. The results of this research can be used for research fund allocation decisions for strengthening service industry competitiveness.

• Journal of the Korean Applied Science and Technology
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• v.32 no.2
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• pp.194-201
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• 2015

A lubricant used in the transport sector have been developed for the purpose of improving vehicle performance. To improve the engine oil for some terrible conditions, various studies have been conducted to improve vehicle performance. There are limitations in development of lubricant for the economic point, but various additives have beed developed in the technical point. Recently, government tried to prohibit reckless use of additives in base oil because of the environmental issues. The institutionalized quality standards of the additives has been estabilished. In this study, physicochemical properties and environmental effect of vehicle engine oils in domestic sector were investigated.