• Journal of The Korean Association of Information Education
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• v.14 no.1
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• pp.35-44
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• 2010

Robots have been recognized as effective tools to promote high level thinking such as creativeness and problem solving that are crucial in Intelligence & Information era. However, robot education in Korea is more concerned with assembling, traveling and programing, while robot education in foreign countries are incorporated with educational courses, being utilized in various ways. Essentially, robot is a multifunctioning device of planning, assembling, operation and problem solving. As it is able to provide practical educational experience, it will positively influence in motivation and accomplishment if being incorporated with educational courses. Therefore, this study compared domestic and foreign robot education cases, while establishing the framework of course incorporated robot education based on analysis of robot mechanism, the 7th curriculum and its activities. We developed robot utilizing educational program by each grade and subject. In addition, this program is reviewed by experts to verify its adequateness, reality and usefulness based on which it was revised and supplemented.

• The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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• v.7 no.4
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• pp.247-256
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• 2002

Distribution of surface and suspended sediments was studied to understand sedimentary processes of finegrained sediment near the cooling water intake of Pyongtaek power plant on the west coast of Korea. The grainsize of surface sediment during the winter was coarser in the opened northern area than sheltered southern area. During the summer, finer sediment was found in the east (landward) than west due under dominantly the influence of tidal current. The concentration of suspended sediments was higher in the winter than summer and in the mid- to deep waters than surface waters. Asymmetry of tidal current induced net landward transport of suspended sediments. Landward transport of suspended sediments was most significant at the beginning of flood time when water level is low. Net suspended sediment fluxes ranged from 3.4$\times$10$^{-3}$ kg.m$^{-2}$ .s$^{-1}$ to 5.7$\times$10$^{-3}$ kg.m$^{-2}$ .s$^{-1}$ This large landward transport of suspended sediments is attributable to combination of enhanced flow induced by intake of cooling water and artificial structures near the water intake.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.6
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• pp.742-752
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• 2017

The bridge type of steel concrete composite rahmen or pre-flex has been applied where a lower depth girder is required due to vertical clearance restrictions caused by the crossing of rivers and roads. On the other hand, because these types are not only complicated to manufacture and construct, but also expensive, void slab bridges may be an alternative. In this study, prefabricated PSC-I shape girder was used to make a void slab and all procedures for bridge development, such as analysis, design, fabrication, and real-scale test, were included in the scope of research. The results of this study will provide sufficient background data to be applied to the field and the structural safety has been verified through experiments.

• Journal of the Korea Society for Simulation
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• v.19 no.1
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• pp.1-11
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• 2010

K company produces semiconductor package products under the make-to-order policy to supply for domestic and foreign semiconductor manufacturing companies. Its production process is a machine-paced assembly line type, which consists of die sawing, assembly, and test. This paper suggests three plans to increase process throughput based on the process analysis of K company and evaluates them via a simulation model using a real data collected. The three plans are line balancing by adding machines to the bottleneck process, product group scheduling, and reallocation of the operators in non-bottleneck processes. The evaluation result shows the highest daily throughput increase of 17.3% with an effect of 2.8% reduction of due date violation when the three plans are applied together. Payback period for the mixed application of the three plans is obtained as 1.37 years.

• Journal of Korean Society of Steel Construction
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• v.30 no.2
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• pp.77-85
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• 2018

A through diaphragm is often used to ensure their stiffness for moment-resisting connections using rectangular steel-tube column and H-shaped beam. The through-diaphragm connections, however, have some difficulties for their applicabilities to the field due to the complexity of the fabrication and construction processes. This study thus proposes a new modular system of steel structures assembled only using bolts without welding, by bringing a connection module composed of rectangular steel-tube column, H-shaped beam and oneway bolt onto the site. An experimental study to evaluate the seismic performance of the proposed connection details based on the new modular system is then conducted. The length and type of the inner reinforcement plate are considered as the primary design parameters, and the strength, stiffness, ductility and energy dissipation capability of the new connections are experimentally analyzed by comparison to those of conventional through diaphragm connections.

• Journal of the Korea institute for structural maintenance and inspection
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• v.14 no.2
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• pp.121-127
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• 2010

An experimental study of composite beam with perforated fiber reinforced polymer(FRP) plank as a permanent formwork and the tensile reinforcement was performed. A combined formwork and reinforcement system can facilitate rapid construction of concrete members since no conventional formwork is needed, which requires time consuming assembly and dismantling. In order for a smooth FRP plank to act compositely with the concrete, the surface of the FRP needs to be treated to increase its bond properties. Aggregates were bonded to the FRP plank using a commercially available epoxy and perforated web of plank. No additional flexural or shear reinforcement was provided in the beams. For comparison, two control specimens were tested. One control had no perforated hole in the web of FRP plank and the other had internal steel reinforcing bars instead of the FRP plank. The beams were loaded by central patch load to their ultimate capacity. This study demonstrates that the perforated FRP plank has the potential to serve as a permanent formwork and reinforcing for concrete beam.

• Electronics and Telecommunications Trends
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• v.29 no.1
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• pp.1-10
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• 2014

3D 프린팅 기술의 발전과 함께 그 응용분야가 확대되면서 최근 관련 소프트웨어 기술도 활발히 연구되고 있다. 본고에서는 최근 컴퓨터 그래픽스 분야에서 발표된 3D 프린팅 관련 소프트웨어 기술을 소개한다. 먼저 프린팅을 위한 3D 모델의 안정성과 내구성을 검사하기 위한 기술을 소개한 뒤 3D 프린터의 프린팅 규모 제약을 극복하기 위한 3D 모델의 분할 및 조립 관련 기술을 설명하고, 이어서 프린팅 된 결과물에 동적인 움직임을 부여하기 위한 운동성 관련 기술을 소개한다. 3D 프린팅 관련 소프트웨어 기술은 최근 2-3년에 걸쳐 새로운 분야를 열면서 논문이 발표되기 시작하여 아직 초기 단계에 머물러 있지만, 향후 3D 프린팅의 응용 분야가 확대되면 많은 연구가 이어질 것으로 예상되어, 현재까지의 연구추이를 살펴 보고 향후 연구개발에 대처할 필요가 있을 것으로 보인다.

• Journal of the KSME
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• v.20 no.1
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• pp.31-39
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• 1980

Automation(자동화)은 1946년 Ford 자동차회사에서 출생한 이래 반도체공업의 기술정보를 배 경으로 한 Computer, NC, Digital 정보처리기술, 도형정보처리기술등의 개발로 급격히 발전하 였다. 1970년대에 접어들면서 공업계기의 발달로 계장 system의 Hardware가 성능이나 신뢰성이 실용화레벨에 올라서 Roqort, 인공화능, man-machine system까지도 나타나게 되었다. 생산 system의 자동화에 있어서도 생산공정의 소재관리, 기계가공, 조립, 검사, 포장등을 일관서있는 연속작업이 되도록하는 종래의 Machanical Automation이 있다. 이는 소품종 다량생산체제에서 고능율, 고도의 가공효율의 요구에 따라 제품의 품질관리 및 제조를 자동전용기에 의한 양산체 제라 하겠는데 이것이 선진국의 1950년대의 자동화의 형태라 할수 있다. 1960년대에 들어서 앞서 기술한 전기 전자 기술의 발달과 제품에 대한 사회의 요구와 그것에 부응하기 위하여서는 생산 Line의 자동화가 점차 지능화하는 경향을 보이고 있으며 이를 Mechatronical Automation이라 부르기도 하나 이 점이 종래의 자동화와 성격이 다르다고 하겠다. 여기서는 생산시스템의 자동 화에 대한 새로운 경향이 어떠한 것이며 또 앞으로의 전망등을 살펴보기로 한다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2013.07a
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• pp.389-390
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• 2013

본 논문에서는 블록 놀이의 질적 향상을 위한다. 일반 블록 완구의 해결하지 못한 문제점인 조립과 완성으로 즐거움이 끝나고 분리시의 지루함을 해결하기위한 블록 자동분리 시스템에 관한 것으로, 좀 더 구체적으로는 블록을 이용하여 물체를 완성시키는 것에서 더 나아가 자동분리 블록의 외부에 부착된 마커를 스마트 폰을 이용하여 인식하고, 인식된 마커에 해당하는 영상을 스마트 폰을 통해 보며 미션을 수행하여 흥미를 유발시키고, 미션 완료 후 블록을 자동 분리 시키기 위한 블록 자동분리 시스템에 관한 것이다. 특히, 블록에 분리장치를 구성함으로써 스마트 폰과의 통신에 의해 분리장치가 동작하여 블록을 자동으로 분리 가능하도록 하여 물체를 완성 후 분리 시에 느끼는 지루함을 최소화하고, 흥미를 극대화시킬 수 있도록 한다.

• Proceedings of the Korean Reliability Society Conference
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• 2011.06a
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• pp.281-288
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• 2011

Hydraulic hose assemblies deliver a fluid power in various oil pressure equipments such as construction machinery, automobile, aircraft, industrial machinery, machine tools, and machinery for ships, or they are used as pipes in oil pressure circuit. However, as the traditional measure for estimating life under the influence of various external factors incurs hardship in terms of time and expenses, it is essential to take accelerated life test by choosing the factor that suits the usage condition of the test object. The objective of the this study is to propose a acceleration model that takes both temperature and pressure without flexing condition into consideration. The life that is calculated by the equation for evaluating life and the test data show similar slopes as a result of comparing and analyzing the equation for evaluating life that is obtained in this research and the test data, which illustrates that they estimate life similarly, and the proposed equation is proved to be an accelerated life equation that presents the test results.