• Journal of the Korean Society for Railway
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• v.18 no.6
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• pp.522-532
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• 2015

In the present study, a tunnel type soundproof wall with partial opening is proposed to reduce the environmental noise caused by railway vehicles traveling on bridges, which affects residents of high-rise apartment buildings; the study also attempts to minimize load due to wind and the weight of the wall. Applying the principles of computational fluid dynamics and structural mechanics, and the ray tracing method, a reduction in noise as well as of the overall weight of the soundproof walls is estimated. Analysis results show that the proposed soundproof wall with a partial opening weighs less, while reducing the wind loading by up to 30%. To prevent direct propagation of sound through openings in the wall, an acoustic louver, which is a type of silencer, could be considered for the opening. In order to achieve a similar noise effect with existing insulation material, the fluid flow and the insulation effect of the acoustic louver are analyzed. As the considered opening is in the range of 30~40% of the total length of the soundproof wall, the noise effect and wind load are reduced by 10dB and 25% respectively. Consequently, opening some part of tunnel type soundproof walls and installing louvers on the wall openings can have the effects of weight-reduction and reduced wind load. If a partial opening is applied with proper sound material application, a gain of an additional 5~10dB of noise reduction can be achieved.

• Journal of the Earthquake Engineering Society of Korea
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• v.1 no.1
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• pp.41-49
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• 1997

This paper presents the result of an international cooperative research on the post-correlation analysis of forced vibration tests and the prediction of earthquake responses of a large-scale seismic test structure. The dynamic analysis is carried out using the axisymmetric finite element method incorporating in finite elements for the for field soil region. Through the post-correlation analysis, the properties of the soil layers are revised so that the best correlation in the responses may be obtained compared with the measured force vibration test data. Utilizing the revised soil properties as the initial linear values, the seismic responses are predicted for an earthquake using the equivalent linearlization technique. It has been found that the predicted responses by the equivalent nonlinear procedure are in excellent agreement with the observed responses, while those using the linear properties are fairly off from the measured results.

• Journal of Korean Philosophical Society
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• v.130
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• pp.219-246
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• 2014

Do the particular good and the common good stand in relation of opposition or superiority each other? With regard to this question, some argue that the relevant Thomas texts reveal the superiority of the common good over the particular good, while others argue for the superiority of the particular good. The argument of this articles is, however, that closer examination of texts shows that Thomas Aquinas seeks to the unity of the common good and the particular good instead of seeing the conflict between them. It is true that Thomist moral and political theory emphasizes the value of the individual, but it should be noted that for Thomas the individual as individual does not exist, but shares specific formal determination with other members of the same species and, therefore, is the individualized, concrete universal. Good, meanwhile, means perfection which each being pursues and a thing is called good in the absolute sense when it actualizes its potentialities as a whole. An individual person is said to pursue only partial good, if it only seeks its perfection as an individual. The nature of individual person should be fully realized only in and through the community pursuing the common good. But the aim of living together which is rooted in the nature of human being as a rational being is for its members to live virtuously. The political community is said to try to bring its individual members to perfection, since the virtues are what renders human beings and their acts good. In this sense the particular good of the individual person is achieved through the pursuit of the common good and the common good is realized through the pursuit of the particular good so that they coincide each other. But this unity remains imperfect, when it would not be rightly ordered to its due end which is non other than the highest good, that is God. Accordingly the goodness of the human being in an absolute sense lies in the unity of the particular good and the common good rightly oriented towards the highest good, which is also called common good which every being pursues.

• Journal of the Korean Geotechnical Society
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• v.18 no.2
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• pp.87-96
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• 2002

The strain holding test(SHT) or the sell-boring pressuremeter test(SBPT) has been effectively utilized to determine the horizontal coefficient of consolidation$(c_h)$ of clayey soils. However, a commonly used procedure proposed by Clarke et al.(1979) can lead to an erroneous estimation of $(c_h)$ because of its simplified assumptions. This paper deals with numerical analyses based on realistic test conditions of the generally accepted testing procedure, and .using the most commonly used type of pressuremeter. The effects of pressuremeter geometry, partial drainage during cavity expansion, and the cavity strain level for the holding test are investigated with the radial distributions of the initial excess pore pressure and their dissipation rate. Based on the results of the numerical analyses, the curve of the time factor for the 50% degree of consolidation($T_{50}$) needed to estimate $(c_h)$ is proposed. Comparisons are made between $(c_h)$ values estimated from the SHT or the SBPT and those obtained from other in situ and laboratory tests performed at two sites in Korea. These results suggest the improved capability of the $T_{50}$ curve proposed herein.

• Journal of Korea Game Society
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• v.11 no.4
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• pp.73-91
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• 2011

This paper investigates the possibilities of protecting game developers under the work-for-hire provision of copyright law. Fundamentally, the work-for-hire clause provides the authorship status to companies, not to game developers. Some argue that the clause is especially appropriate in software industries including game industries because they are new and different from typical types of copyright industries. However, game industries are different from software industries as well as typical types of copyright industries in that they have both cultural (artistic) as well as industrial characteristics. Game developers not being provided with the authorship status may be one of the reasons for the disputes related to turnover and knowledge leakage. This paper mainly suggests three kinds of solutions: first, protecting the moral right even in the work-for-hire provision; second, protecting game developers as coauthorship; and third, providing monetary compensation as it is in employee invention.

• Journal of the Korean Geotechnical Society
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• v.38 no.12
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• pp.29-43
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• 2022

Various underground facilities are being constructed to improve the urban environment. Therefore, it is more necessary than ever to reasonably evaluate the seismic response of underground utility tunnels, playing a significant part in urban infrastructure. In this study, the major features and differences of two types of existing pseudo-static analysis methods are reviewed. Each method uses a simplified 2D frame model to represent the seismic behavior of underground structures. Applying each method to a one-barrel rectangular utility tunnel in Korea, the suitability in predicting seismic responses, especially the racking deformation of the tunnel, is examined. In addition, several precautions and suggestions are provided in this study against the inattentive application of the methods to seismic evaluation of underground structures.

• The Journal of the Petrological Society of Korea
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• v.13 no.3
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• pp.161-177
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• 2004

The Cretaceous pink granites of the finan area, southwestern Ogcheon belt, are adjacently developed in the eastern part (Keg) and western part (Kwg) as stocks, respectively. Keg of rounded shape occur as mainly medium-coarse grained rocks, whereas Kwg of ellipsoidal shape occurs as medium-coarse grained ones with partly porphyritic and fine-grained textures. Miarolitic cavities of them are often seen and can be observed more frequently in Kwg than Keg. Rose and counter fracture diagrams of the two granites show that Keg and Kwg have more potentiality of non-dimension and dimension to non-dimension stones, respectively. Physical properties such as porosity and absorption ratio have 0.25% and 0.65％, and 0.43% and 1.11%, respectively, which could suggest that emissions of gas phase at later magma stages are abundant in Kwg than those of Keg. From the major and trace elements petrochemisoy, they belong to acidic, peraluminous and calc-alkaline rocks, showing that Kwg are later product than Keg of the same granitic parent magma. REE concentrations normalized to chondrite value have trends of gradual and parallel enriched LREE and depleted HREE. Eu negative anomalies of Kwg are far more severe than those of Keg, which suggest that plagioclase fractionation in Kwg was much stronger than that of Keg. In the magnetic susceptibility vs. petrochemical and modal parameters, they all belong to magnetite-series and I-types, and can be classified as weakly-moderately ferromagnetic rocks. And the above relations could suggest that their susceptibility values are more mainly depended on ferromagnetic opaques than ferromagnetic and paramagnetic assemblages (Bt ＋ Ch ＋ Ser ＋ Op).

• 한국지구과학회:학술대회논문집
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• 2005.09a
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• pp.213-219
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• 2005

본 연구에서는 교사의 전문성 영역의 한 부분인 학생 평가 전문성을 교사 스스로 진단해 보고 진단 결과에 대해 적절한 처방을 제공받을 수 있는 교사의 학생 평가 전문성 자기진단 프로그램을 개발하고자 하였다. 이를 위해 선행 연구와 문헌 조사를 통해 교사의 학생 평가 전문성을 구성하는 요인을 규명하고 이를 범주화하여 학생 평가 전문성 진단 도구를 구안하였다. 교사의 학생평가 전문성 구성 요인은 1990년에 미국의 AFT(American Federation of Teacher), NEA(National Education Association), NCME(National Council on Measurement in Education)가 공동으로 발표한 ‘학생 평가를 위한 교사의 평가전문성 기준(Standards for teacher competence in Educational Assessment of Student)’ 7가지를 연구자가 진단 도구 개발에 적합하도록 ${\circled1}$평가 방법의 선정, ${\circled2}$평가 도구의 개발, ${\circled3}$평가 실시?채점 및 성적 부여, ${\circled4}$평가 결과의 해석?분석?활용?의사소통의 4개 영역으로 재구성하였다. 진단도구를 개발하는데 있어서는 전문성 구성 요인별로 설문 형식의 질문에 답하고 이를 종합하여 점수를 매기는 방식보다는 구체적인 상황과 사례를 제시하고 이에 대해 평가를 해보게 하는 방식을 이용하여 평가 능력을 실질적으로 진단할 수 있게 하는데 초점을 맞추었다. 개발된 프로그램은 교사가 외부로부터 평가 받는데 소극적인 점을 감안하여 교사 스스로 자기를 진단할 수 있는 도구를 제공하고자 했으며, 진단 도구를 통해 밝혀진 결과에 대해 처방이나 안내를 함께 제공하여 교사가 자신의 평가 전문성을 제고하는데 보다 적극적으로 나설 수 있도록 도울 수 있는 프로그램으로 개발하려 하였다. 또한 이 프로그램을 교사가 활용하는 과정에 대한 조사 연구를 통해 궁극적으로는 교사의 학생 평가 전문성 신장을 위해 필요한 외부 지원이 무엇인지 추출하고 이러한 지원 체계와 교사가 능동적으로 이어질 수 있는 방안을 모색해 보고자 한다.

• Proceedings of the Korea Electromagnetic Engineering Society Conference
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• 2003.11a
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• pp.288-293
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• 2003

In this paper, Filter could use to IMT2000 repeater using resonator of Comb-line form that has waveguide structure and designed. Coupled resonators designed using slot in wall between resonators to compact. 5-stage resonators have equal structure and input and output part was optimized to get into minimum impedance. Band pass filter characteristic satisfied design condition as result that used Chebyshev function that have 0.2 dB ripple and analyze using simulation tool.

• Journal of the Korean Society of Propulsion Engineers
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• v.18 no.4
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• pp.50-60
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• 2014

Many countries are paying efforts to the research and development of water-breathing ramjet propulsion for submersible vehicle with the super-cavitation which makes traveling at high speed in underwater possible. In this study, a conceptual design of an underwater vehicle with water-breathing ramjet was carried out. Mission profiles and operating conditions are determined by examining the operation environment. Drag is estimated based on the theories of super-cavitation and fluid mechanics. The sizing and performance analysis of the components were performed using thrust required, thrust and specific impulse of designed engine were verified.