• Journal of Ocean Engineering and Technology
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• v.25 no.6
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• pp.9-16
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• 2011

The feasibility of wave energy extraction from a heaving truncated cylinder and the corresponding response of the linear electric generator (LEG) composed of spring, magnet, and coil has been investigated in the frame of three-dimensional linear potential theory. The heaving motion of a circular cylinder is calculated by means of the matched eigenfunction expansion method. Further, the analytical results are validated by numerical results using the ANSYS AQWA commercial code. By the action of a heaving circular cylinder, the magnet suspended by a spring can slide vertically inside the heaving cylinder. The mechanical power is extracted from the magnet motion relative to the coil/stator which is attached to the cylinder. The coupled ODE of a heaving cylinder and LEG system in waves is derived to obtain the magnet motion relative to a cylinder. To maximize the relative motion of the magnet, both the buoy draft and the LEG system parameters (spring stiffness, damping) should be selected properly for generating the double resonance considering the peak frequency of the target spectrum.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2003.05a
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• pp.394-397
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• 2003

In this paper, we describe the implementation of high performance buffer manager that is used in an advanced input-queued switch fabric. The designed buffer manager provides wire-speed cell/packet routing with low cost and tolerates the transmission pipeline latency of request and grant data. The buffer manager is implemented in a FPGA chip and supports the speed of OC-48c, 2.5Gbps per port.

• Journal of Korean Society for Quality Management
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• v.28 no.4
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• pp.75-98
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• 2000

The purpose of this study is to empirically examine the customers' perceived service quality and response in the field of hotel industry. The subjects of survey for this empirical analyses are limited to the customers of deluxe hotels in Korea; data are collected from the 16 deluxe hotels amongst 27 of its kind in the Seoul, Pusan, Cheju and Kyongju area. SAS package is used for Simple Regression, Multiple Regression and the results are as follows: First, the perceived service quality shows significantly positive effect upon the customers' satisfaction; Second, the customers' perceived service quality shows significantly positive with respect to the customers' response; Third, the customers' satisfaction shows significantly positive regarding the customers' response, and the customers' satisfaction have greater influence upon the customers' response than the customers' perceived service quality; On the basis of the above empirical analyses, I propose the management implication as follows: First, the hotel management staffs should have a close relation with their customers through the customers' positive, and eventually be concemed about improving service quality and customers' satisfaction to maximize the enterprise's performance; Second, the hotel management staffs, to induce and build up the positive customers' response, should have interest in serving high-quality products and service and enforcing the proper price policy.

• The Journal of Engineering Geology
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• v.7 no.1
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• pp.81-90
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• 1997

The Korean historical 1iteratures describe that great eaathquakes with destructive damages occurred mainly in Kyongju-Ulsan areas during the period of 1 to 8 century and 16 to 17 century. It seems that the Ulsan fault system shows a little curved ttend with N-S strike in the southern part and diverges into three directions from the mid-northern lart of the fault. The dominant trends of the lineaments are NNE-SSW, NE-SW and NS directions. Trench excavation in the mid-northern part of the Ulsan fault shows thrust facies cutting slope deposit containing a compacted laminar structure whose origin may due to severe cryogenic activities of the last cold period(ahout 25OOO B.P.). Detailed observation of the facies gives some evidences related to two earthquake episodes of thrust components along the Ulsan fault system. Fault outcrop and trench study suggest that Ulsan fault seems to he one of the active fault which has reworked several times even in the late Quaternary.

• The Journal of the Korean Society for Microbiology
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• v.22 no.1
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• pp.61-70
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• 1987

Authors have isolated phages of V. parahaemolyticus from shellfish and investigated some of their characteristics. The results obtained were as follows: Twenty-three phage strains(9.2%) out of 250 specimens were isolated. Plaques of phages were small, clear or turbid and $0.5{\sim}1.5mm$ in diameter. The electron micrographs of K3 phages showed two morphology; one was a hexagonal head about 105nm with a tail about 12nm, the other was a hexagonnal head about 60nm with a tail about 25nm. The host ranges of pahges were limited to V. parahaemolyticus strains and there appeared to be no relationship between the K serotypes of V. parahaemolyticus strains and the host ranges of the phage isolates. The adsorption rate of phages were more than 80% for $10{\sim}15$ minutes, the inactivation rate at $60^{\circ}C$ was more than 99% for $40{\sim}45$ minutes. The pH stability range was between 6.0 and 8.0. The inactivation rate of phages by UV irradiation was more than 99% for $45{\sim}75$ seconds.

• Journal of Korean Library and Information Science Society
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• v.30 no.3
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• pp.323-344
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• 1999

First, having noticed that the paper on which the Mugujongkyong from the Sokgat'ap was Broussonetia Kazinoki Siebold, produced under the Tochim process, it is confirmed that the paper used for printing the Mugujongkyong form the Sokgat'ap was Broussonetia Kazinoki Siebold produced in Shilla, by introducing the common fact that the papers on which : written in 755 A.D.) and in Soochung-sokt'ap Hwaomasa were written were the same paper fabricated by the Tochim process. Therefore it is proved that the printing place of the Mugujongkyong from the Sokgat'ap was also Kyongju region in Shilla. Furthermore it is proved that the year of storing Broussonetia kazinoki Siebold n which tarani of the Mugujongkyong was written was circa 705 A.D., provin12g that Broussonetia Kazinoki Siebold was in production in Shilla in 8th Century. Also by confirming the fact that very thin -- mere 0.019mm thick -- Broussonetia Kazinoki Siebold was in production in Shilla in 8th Century, it is proved that Shilla has ability to produce Broussonetia Kazinoki Siebold for Woodblock printing purpose. Second, concerning the Muju Characters written in the ugujongkyong from the Sokgat'ap, mixed use of the Muju Characters was noticeable in written in 755 A.D. from the Sooch'ungsokt'ap at the Hwaomsa written in the same era and the Tripitaka Koreana in Japan was printed in 690's A.D. because of appearance of the Muju Characters in the Saddhamapun-darika is erroneous.

• Journal of environmental and Sanitary engineering
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• v.16 no.3
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• pp.1-13
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• 2001

트리클로로에틸렌 (trichloroethylene, TCE)는 오랜 시간동안 자연환경에서 잔류할 뿐만 아니라 TCE보다 더욱 더 독성이 강한 중간 생성물들을 만들기 때문에 미국과 대부분의 전세계 국가들로부터 주요 1차 환경오염물질로 분류되었다. 그러한 독성물질들은 혐기성 상태에서는 다이클로로 에틸렌(dichloroethylene, DCE)과 바이닐 클로라이드 (vinyl chloride, VC)와 같은 독성물질들이 생성되고 호기성 상태에서는 TCE epoxide계통의 물질들이 생성된다. 또한 훈증제인 메틸 브로마이드 (methyl bromide)는 대기의 오존층을 파괴하는 것으로 알려져 있고, 2001년경에 미국환경보호청 (USEPA)에 의해 사용이 금지될 것이다. TCE는 혐기성 조건하에서 연속적으로 탈염소화되고, 이어서 호기성 조건하에서 완전 산화될 수 있다. 그리하여 연속적인 혐기성 및 호기성 조건하에서 궁극적으로 TCE의 완전분해를 이루게된다. 메틸브로마이드는 화학적으로 가수분해되어 메틸 알콜 (methyl alcohol)로 되거나 유기물에 강하게 결합 (bound)된다. 또한 그것은 생물학적으로 포름알데하이드 (formaldehyde)로 산화되거나 메틸알콜로 가수분해된다. 수많은 연구자들에 의해 행해진 연구들은 TCE와 MeBr은 메탄 혹은 암모니아 산화 세균에 의한 공동대사과정 (cometabolism)을 통해 분해가 증진될 수 있다는 것을 보여주었다. 두 부류의 세균들이 두 화합물들을 분해시킬 수 있는 monooxygenase를 생산한다는 것은 잘 알려져 있다. 이 연구 논문에서 TCE와 MeBr의 생분해와 관련된 가장 최근의 연구논문들로부터 나온 핵심 연구결과들이 요약 검토된다. TCE와 MeBr로 오염된 현장을 정화하기 위해 이러한 기초연구결과들을 토대로 더욱 더 많은 연구가 필요 할 것으로 사료된다.

• Spatial Information Research
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• v.6 no.1
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• pp.25-33
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• 1998

The study region encompasses about 5,900$km^2$ including the topographic maps of Kimhae, Pusan, Miryang, Yangsan, Panguhjin, Tonggok, Uhnyang, Ulsan, Youngchon, Kyongju, Pulguksa, and Kampo, all at a scale of 1:50,000. The paper discusses how to have prepared the four thematic maps, landslide and unstable slope distribution map, slope classification amp, soil classification map, and lineament density map. Using all the above maps and GIS, the relative slope-stability map for the study regiun was produced at a scale of 1:100,000 ; the map can be utilized for the regional land-use planning in the study region.

• Journal of the Korean Home Economics Association
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• v.29 no.3
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• pp.1-10
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• 1991

The purpose of the present study was to identify the effects of communicator, type of clothing and subject's age on informational influence in clothing conformity. The sample consisted of 205 subjects assigned to two groups (female college students in their early twenties and housewives in their late thirties living in kyongju). In this study the research design consisted of a 3(communicator)×2(subject's age)×2(type of clothing) factorial design. The stimuli consisted of 10 color photographs (6 one-piece dresses and 4 jeans in current fashion) In the first step, subjects were asked to arrange stimuli in the order of greatest fashionability. In the second step, subjects were exposed to experimental manipulation which consisted of slides of various clothing styles and an essay concerning a forecast on fashion trends. The communicator in the essay was described as a designer, a college student, or a housewife. In the third step, in addition to other questions subjects were asked to indicated their degree of agreement with the essay. The data were analyzed by ANOVA, X2 and t-test. The results were: 1. Informational influence on clothing conformity varied by communicator, type of clothing, and subject's age. Subjects were most conforming when the communicator was described as a designer and when the clothing style was a one-piece dress. 2. Informational influence results revealed that housewives were more conforming than the female college students in the jean style.

• Proceedings of the KIEE Conference
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• 1999.11b
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• pp.110-112
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• 1999

Recently the substation automation is actively researched at each country. Since the substation automation is an integrated system that consist of electrical, electronic and computer technologies, performance evaluation is very important to inspect the developed system's applicable possibility for real power system. Most studies are verified using computer simulation, because it is hard to apply them to real power systems. Therefore development of a substation simulator is necessary for the performance evaluation of many application systems such as operator aid system. This paper introduces a substation simulator. An intelligent fault diagnosis and restorative control expert system is also introduced UDP/IP is applied as a protocol for data transport between expert system and SC(station computer). As to the Graphic User Interface, C++ Language and Visual Basic is used in the Windows NT operating system together with four Pentium II systems.