• Journal of Institute of Control, Robotics and Systems
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• v.3 no.3
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• pp.265-271
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• 1997

A fuzzy logic controller (FLC) has been widely used for many applications in recent years. But the relationship between control performance and design parameters has not been handled explicity in the conventional theory of fuzzy logic control. In this paper, based on the similarity between an FLC and a variable structure control (VSC) theory, a performance evaluation of an FLC, which gives quantitative accounts on the relationship is presented. The validity of the analysis is verified through extensive computer simulations.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2013.11a
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• pp.48-49
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• 2013

This test investigates early strength and durability of concrete using early strength type materials(cement, Polycarboxylate acid). The goal of this test is to secure the strength of 5.0 MPa in 12 hours early age and strength of 14 MPa for 24 hours correspondingly. This type of admixtures, concrete curing temperature, amount of binder and other concrete properties were confirmed by experimental factors. Comparing outcomes from two cases on using early strength type materials and common materials resulted in reducing of costs and shortening of the construction period, that determined the economical benefits of using early strength materials in construction.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 1997.10a
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• pp.63-69
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• 1997

A series of internatinoal standards in connection with safety of ships, safety management and operation of company, and pollution prevention at sea has been provided in ISM. And that Cheapter IX has been adopted in SOLAS with ISM as its annex gives this code mandatory effect On the eve of the implementation of ISM by IMO. Administrations, classifications, other maritime industry organizations as well as all shipping companies assessmentand evalution have been made inthis paper to thedevelopment of marine safety culture through the discussion of the general recognition of safety culture by IMO and her Contracting States, thenecessity for establishing unity of benefit and safety in a shipping company, the development of scientific safety managment systems and new reflections of safety culture in internation shipping industries.

• Environmental and Resource Economics Review
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• v.1 no.1
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• pp.1-25
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• 1991

The domestic liquefied natural gas project has been carried out as a national energy scheme since the late 1980's in Korea. The natural-gas supply for civilian demand is limited to the Kyung-In area. In addition, seven major city gas corporations which now participate in the project occupy the monopolistic service area. In this study, objective cost evaluation criteria for gas distribution and an improved proposal in the evaluation method are suggested. They will go forward in solving the problems to promote demand and prevent excess profit or deficit according to the physical characteristics of the monopolistic service area.

• Journal of KIISE:Computing Practices and Letters
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• v.11 no.2
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• pp.192-207
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• 2005

As the evaluation for the information security has been an important issue, numerous security evaluation methods have been proposed. Those security evaluation methods can be categorized into three different aspects in large including product, process and control. In this paper we identify the possible problems that may occur when one-sided security evaluation is conducted that is on the aspect of product, process or control alone, present with the actual example of threat, and propose an approach to resolve each problem. Based on these approaches, we propose the security evaluation model, which incorporates these three aspects of product, process and control.

• Proceedings of the KAIS Fall Conference
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• 2003.06a
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• pp.256-259
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• 2003

Artificial heart is divided pulsation style and nonpulsation style greatly according to flowing of blood. nonpulsation pump is advantage of miniaturization avaliable because it is simple and non-volumic-pump than pulsation pump. Non pulsation pump is derided axial flow style and centrifugal style accordig to rotating style. An axial flow blood pump can be made smaller than a centrifugal blood pump because of its higher specific speed. A hemolysis is an important factor for the development of an axial flow blood pump. It is difficult to identify the areas where hemolysis nun. Evaluation of hemolysis both in in vitro and in vivo require a long time and are costly. Computational fluid dynamics(CFD) analysis enables the engineer to predict hemolysis on a computer. The aims of this study is Computational fluid dynamics in the whole axial flow pump and to verify the accuracy of prediction results of CFD analysis compare with in vitro experimental results.

• Proceedings of the KSR Conference
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• 2008.11b
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• pp.1766-1769
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• 2008

INnterior noise characteristic of Korean tilting train(Hanvit 200) under the field test conditions is analyzed in this paper. The test railroad track was selected from Seodaejon to Songjeongri in Honam line. $4^{th}$ and $5^{th}$ car are decided to measure interior noise level among a train of six cars. The test subject open field executed from test sections. The speed of test trains when from existing operation speed and speed up 20% of existing speed. On open field at the time of operation speed of Hanvit 200 trains from below 160km/h interior noise level at $68dBA{\sim}70dBA$.

• Proceedings of the Acoustical Society of Korea Conference
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• 1994.06a
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• pp.842-847
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• 1994

This paper presents the nearfield acoustic holography (NAH) imaging system for airborne sound constructed in our own laboratory. The effects of different kinds of noise and the filter function's form in wave number space for reconstructions are analysed emphatically. Using the system we have measured the vibrating mode and the radiated field of a simulative "Chime Stone" made by metal, and gotten interesting results. These results indicate that NAH can be used to research the mechanism of sound production and evalution of musical quality for Chime Stone as an effective means.

• Journal of Korean Port Research
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• v.11 no.2
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• pp.295-304
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• 1997

For evaluation of maritime power, the attributes of sea power are identified in this paper by system analysis method. A many fundmental factors of sea power are selected by survey of the extensive and thorough literatures on maritime power. And the factors are classified into 11 standard attributes by cluster method. The 11 standard attributes are as follows: geographical condition, character of territory, character of the people, maritime will of the government, shipping power, navel power, shipbuilding power, fishing power, ocean research and development, dependence on seaborne trade, number of ocean population. As the sub-attributes of the standard attributes, 37 composite factors and some basic factors are defined through careful survey and discussion with some experts. As the result of this study, the maritime power is systematically identified as maritime power system. And it is realized that the evalution of maritime power system is the hybrid MADM problem with both quantitative and qualitative factors.

• Journal of the Korean Institute of Telematics and Electronics
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• v.23 no.6
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• pp.902-907
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• 1986

A real-time microprogrammable digital signal processor is designed and implemented using the bit-slice logic, a parallel multiplier, 74 series TTLs and MOS memories. A microinstruction set for the processor is defined and an application program development system is constructed. For its performance evalution, a digital filter and FFT are implemented with this digital signal processor. It is proved that this processor is faster than commrcially available single chip digital signal processors such as \ulcornerD 7720, AMI 2811, enabling very high speed digital signal processing.