• TTA REPORT
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• v.3 no.1 s.7
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• pp.14-19
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• 1991

본 기사는 일본 ITU협회가 발행하는 $\ulcorner$ITU 연구$\lrcorner$ 90년 8월호를 당 협회가 번역한 것으로 전기통신에 있어 발생하는 표준화와 지적 재산권간의 미묘한 이해$\cdot$갈등을 사례별로 다루었다. 표준화, 지적 재산권의 상관관계를 재고하며 표준화사업에 조금이나마 도움이 되도록 두 번에 나누어 연재한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.3
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• pp.14-21
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• 2017

The extreme floods recently are have been attributed global warming, The development of a canal tunnel to prevent floods by making a bypass or undercurrent to flood discharge in a major flooding area is required because urban flooding in heavy rainfall occurs frequently, increasing the impermeability according to lack of capacity in sewage to urbanization by the existing urban basin. In this study, a numerical simulation was performed to support design standards for a multi-purpose waterway tunnel combined road tunnel of canal tunnel. The numerical simulation showed that the size of the friction loss occurring in the tunnel section of the same channel occurred more than the theoretically calculated frictional loss derived from the numerical simulations. This is probably due to the additional frictional loss caused by the change in the flow structure due to the geometry of the pipe when the shape of the channel is non-circular. The increase in friction loss was more pronounced in the laminar flow than in the turbulent flow. Depending on the shape of the conduit, the friction loss should be adjusted for accurate flow calculations. This result can provide the basin information about the design of flood by a pass conduit.

• TTA Journal
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• s.46
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• pp.116-129
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• 1996

지난 2월 8일 클린턴 대통령은 ''1996년 전기통신법''에 서명하였다. 따라서 이제 미국에서는 통신, 정보, 미디어산업간의 진입장벽이 허물어져 무한 경쟁의 시대로 접어들게 되었다. 이미 미국내의 주요 사업자들은 경쟁력 강화를 위한 경영효율화와 M&A 등의 조치를 광범위하게 취하고 있다. 세계 정보산업의 리더인 미국 산업계의 이러한 변신은 곧 세계의 정보통신산업에도 광범위한 영향을 미치게 될 것이다. 그리고 사실상의 표준(de facto standard)에 강한 미국 기업들이 보다 자유로운 여건 하에서 해외시장 진출을 추진하는 과정중 표준을 둘러싼 마찰을 일으킬 가능성이 매우 크다고 할 수 있다.

• Journal of the Society of Disaster Information
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• v.16 no.4
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• pp.712-722
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• 2020

Purpose: The damage from earthquakes with a magnitude of 5.0 or greater Korea has increased in South Korea. When a earthquake occurs, internal facilities and electric equipment besides urban structures will be damaged. Thus, in this paper, an earthquake-induced seismic isolation device with double slip fiction surfaces which can reduce the damage of electric power equipment such as distribution panel and then the seismic performance was evaluated. Method: To evaluate the seismic performance shaking table test was performed, a seismic performance comparison was performed according to the presence or absence of a seismic isolation device. The attenuation effect of the seismic isolation device are analyzed by comparing response acceleration and displacement for different frequencies and acceleration levels. Result: As a result of the test, the acceleration amplification was up to 42% less than when the seismic isolation device was installed in comparison to the other case without the seismic device. This is believed that the amplification energy has reduced because the displacement between the double slip friction surfaces of the seismic device play a role in dissipating the seismic energy. Conclusion: The seismic device with double slip friction surfaces has a greater earthquake attenuation effect in strong earthquakes than in weak ones, so the greater the frequency, the better the earthquake attenuation effect. Therefore, it is judged that earthquake energy can be decreased by applying to electric equipment such as distribution panels.

• Journal of Convergence for Information Technology
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• v.9 no.7
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• pp.94-99
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• 2019

Friction stir welding was first reported by TWI(The Welding Institute) in 1991, and this welding method has been rapidly used in various industrial areas such railway, automobile, aerospace and shipbuilding industry. Here, we study core characteristics of friction stir welding (FSW) applied to Al 6005-T6 extruded sheets, which is the typical alloy used for railway car bodies. With the fixed welding speed of 500 mm/min, the rotating tool speed was varied from 600 to 1800 RPM. The results of hardness measurement revealed that the hardness of nugget area is ~70% with respect to the parent material, and for the selected range of rotation speed, no clear dependence was observed and the hardness values close to the parent materials were achieved for the area located 5 mm away from the welding interface. The tension test shows that yield strength and tensile strength were slightly decreased with increasing RPM, with no observed difference for the elongation.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.33 no.4
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• pp.1611-1617
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• 2013

Information about trafficability or the condition of road with regard to its being traveled over by vehicles is one of the most critical factors for roadway operation in winter. Specifically, when traveling on snowy or icy surfaces, the traction force varies per vehicle type including tire types, geometric characteristics of roads, and conditions of road surfaces. In general, front-wheel drive or four-wheel drive vehicles have better traction performance on snowy or icy surface than rear-wheel drive vehicles, and the latter type vehicle causes more serious traffic congestion when there is unexpected snowfall. Thus, traffic information regarding trafficability with respect to vehicle types, geometric characteristics of roadway sections, and roadway surface conditions can provide a foundation to make a decision whether to use the associated roadway sections for roadway operators as well as users. Based on the preceding premise, the objective of this study is to present a methodology for developing a trafficability index with respect to vehicle types, geometric characteristics of roadway sections, and roadway surface conditions.

• Korean Business Review
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• v.7
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• pp.57-77
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• 1994

우리에게 미국시장은 매우 중요하다. 따라서 최근에 미국시장에서 일어나고 있는 한국과의 통상마찰은 우리가 적극적이고 슬기롭게 대처해 나가야 할 부분이다. 이러한 문제에 대한 대안으로 통상로비 전략의 구축은 중요한 통상마찰의 해소 방안이 될 수 있다. 지금까지 논의한 통상로비에 관한 이론과 외국의 대미(對美)로비 실태파악과 우리의 로비전략을 살펴보았다. 여기에서는 앞에서 언급한 한국의 대(對)미 통상로비전략을 간단하게 요약하여 정리해 봄으로써 연구 결론을 내리고자한다. 즉, 통상로비전략을 네 가지 차원으로 나누어 설명하면 다음과 같다. 첫째 기본전략으로써 미국에 관한 철저연구와 우리주장의 논리적 타당성을 얻기 위해서 문화홍보에 역점을 두어야 하고 대중 동원형(Grass Roots)로비를 효율적으로 전개할 필요성이 있다. 둘째, 정부의 대응전략으로 미국내 한국에 대한 여론조사를 실시하여 한국의 이미지와 그러한 인식이 생성된 배경의 파악이 중요하다. 한국 내에서의 대미(對美)로비를 중시하여 한국에 파견된 미국대사관 직원, 해외방송, 신문, 특파원에 대한 한국 홍보강화와 해외 홍보기금조성을 통하여 정부차원에서 해외홍보를 적극 권장하고, 정부부처간이나 기업 간에 연락 및 협력을 강화한다든지 민간기업의 로비를 간접지원 하는데 노력해야 할 것이다. 셋째, 업계단체의 대응전략으로 미국통상에 관련된 최신정보를 신속히 수집하여 이를 파악하고 관련된 정보를 전달하는데 힘써야 한다. 그리고 통상마찰의 문제가 발생하기 전에 로비전략을 수립해 놓음으로써 시기적전하고 적당한 대처를 해 나갈 수 있다는 것이다. 업계의 전체의견을 미국의 정부, 의회, 동종 관련단체 등에 효과적으로 전달하기 위한 채널개발의 중요성과 해외경제 홍보센타(가칭)의 설치로 대규모 수출기업과 업계단체간의 해외홍보의 효율성을 올릴 수 있다. 넷째, 민간기업의 대응전략으로는 현지국과의 공존공영을 추구하여 현지국의 경제에 기여하겠다는 기업 시민의식과 현지국 사회활동에 적극 참여하여 한국의 대외 이미지 개선을 위한 적극적인 PR활동과 기업의 최고경영자 차원의 로비활동 추진으로 대미(對美)로비체제를 적극적이며 능동적으로 수행할 수 있도록 하여야 한다.

• The KIPS Transactions:PartB
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• v.12B no.2 s.98
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• pp.157-166
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• 2005

In 3D virtual environment the description of character' s movement that has utilized the conventional key-frame technique is gradually being developed toward the application of motion control method to generate more realistic and natural motion. Even the motion control method, however, has the limitation for expression of character's motion adapted to the ground properties of virtual world. That is, the walking motions of character are not only, for the most part, so uniform simple and repeated often as to feel to be tedious, but also the unnatural motion in which the tips of the toes soak through a plane or float in the air discording with the conditions of terrain lowers the semblance of reality. This paper proposes an adaptive motion control method for human figure locomotion in virtual environments or games, in which the walking motion is dynamiccally adapted to the ground's sliding properties. We compute an optimal parameters for one cycle of walking motion adapted to the ground properties by combining the coefficient of friction and centripetal force, and therefrom we induce a set of nonskid speed corresponding to various sliding properties of the ground.

• Life and Agrochemicals
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• v.26 no.5 s.208
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• pp.32-36
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• 2005

• Journal of Korean Electronics
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• v.11 no.7
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• pp.57-62
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• 1991

편집자 주: 본고는 대미통상마찰 완화 및 민간차원의 통상활동을 위해 본회 구자학 회장을 단장으로 '91년 5월 20일부터 6월 30일까지 대미통상 활동을 벌인 내용임을 밝힌다.