• 문화기술의 융합
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• 제10권1호
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• pp.227-233
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• 2024

한국은 '22년 역대 최대의 방산수출 실적을 달성하였다. 방산수출은 한국의 무기를 외국에 수출하는 것으로 방위산업 진흥을 위한 가장 효과적인 방법이다. 또한, 우수한 무기체계를 지속적으로 공급하려면 견실한 방위산업이 구축되어 있어야 하기 때문에 방산수출은 국가차원의 중요한 사안으로 정부는 대통령실을 콘트롤타워로 적극적인 지원정책을 펼치고 있다. 특히 한국의 방산수출 빅4 진입이라는 화두가 제기되고 있는데, 본 논문은 기존에 제시된 방산수출 진흥 방안과는 달리 혁신적인 방안으로서 세계 수준의 무기체계를 보유할 수 있는 첨단기술 확보와 구매국의 요구에 맞춤형으로 수출할 수 있는 공동연구개발이라는 전략적인 방안을 제시하고 구체적으로 실행할 수 있는 절차를 제시하였다. 즉 첨단기술 확보를 위해 군은 기존의 방식을 탈피하여 과감한 첨단기술 선정과 충분한 예산 지원을 하고 개발기관에게 자율성을 부여해야 하며 이 기술이 첨단무기에 적기에 적용되도록 신속개발시스템도 도입해야 한다. 수출 공동연구개발은 구매국의 첨단기술 보유 의지를 고려하여 초민감 핵심기술을 제외한 유연한 기술이전을 추진하고 전략적 파트너십을 형성하는 방향으로 나아가도록 하는 것이다. 이를 통해 한국의 방산수출 변화의 시점에서 획기적이고 새로운 전략을 통하여 한국의 방산수출이 세계 빅4에 진입하는데 도움이 되도록 하였다.

• 기술혁신학회지
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• 제3권2호
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• pp.94-110
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• 2000

This article prospects the patterns of technological innovation in the steel industry and suggests the directions of technological innovation in Korean steel industry. Technological innovation patterns can be analysed through technological trends, innovation-inducing mechanism, and innovators' relationships. In the technological trends, direct coupling of manufacturing processes, lasting growth of mini-mill, and the importance of technological integration are prospected. In the innovation-inducing mechanism, while production system will be specialized, the development of new steel materials and environment-friendly technological innovation will be accelerated. In the innovators' relationships, steel industry faces more complex competition and new forms of inter-firm cooperation including M&A, joint venture, and joint R&D. In order to cope with such changes in the technological innovation patterns, Korean steel industry need to establish core competence based on technological innovation through a great leap in R&D investment, the production of high value-added products, the development of new generation steel technologies, strategic joint R&D, comprehensive technological cooperation, and government's active support.

• 한국군사과학기술학회지
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• 제22권5호
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• pp.581-589
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• 2019

Guided missiles assembled with the bolted joint are subjected to various shock loading conditions while flying in the air and operating on the ground or platform. Especially, It is important to analyze the effect of the shock load on the structure because it affects the structure for a short duration time while its acceleration magnitude is quite large. In this study, mechanical shock tests on the structure with the bolted joint have been carried out to measure the acceleration changes of the structure against external shock loads by electrical exciter. Variation of dynamic characteristics of a structure with fastening methods and fastening forces has been investigated through Shock Response Spectrum analysis.

• 대한인간공학회지
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• 제30권2호
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• pp.357-363
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• 2011

Objective: The aim of this study is to set the design direction of the lift chair's tilting seat for development. Background: Great attention has been shown to the development of senior friendly product, because of increasing elderly population rapidly in Korea. Therefore, we need to study on sit-to-stand(STS) motion of elderly systematically for developing lift chair that is one of senior friendly products. Method: In this study, we analyzed joint moment(knee, hip) and muscle activity (Erector spinae, Rectus femoris, Vastus lateralis) on STS motion of elderly(female, 60~70: 7) and young people(female, 20~30: 7) using 3 dimension motion capture camera, force plate, wireless EMG. Results: The results of muscle activity showed a similar trend but the results of joint moment were a lot of differences between the young and the elderly. Conclusion: The results of knee joint moment suggest the angle(10~30deg)-adjustable seat that can be better than to find the optimal seat's angle. Application: The method and results of this study are expected to develop senior friendly product and verification as well as be available to various application.

• Nuclear Engineering and Technology
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• 제54권1호
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• pp.357-373
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• 2022

The high-temperature gas-cooled reactor pebble-bed module project is the first commercial Generation-IV NPP(Nuclear Power Plant) in China. A new joint is used for the vertical support of RPV(Reactor Pressure Vessel). The steel corbel is integrally embedded into the reactor-cabin wall through eight asymmetrically arranged pre-stressed high-strength bolts, achieving the different path transmission of shear force and moment. The vertical monotonic loading test of two specimens is conducted. The results show that the failure mode of the joint is bolt fracture. There is no prominent yield stage in the whole loading process. The stress of bolts is linearly distributed along the height of corbel at initial loading. As the load increases, the height of neutral axis of bolts gradually decreases. The upper and lower edges of the wall opening contact the corbel plate to restrict the rotation of the corbel. During the loading, the pre-stress of some bolts decreases. The increase of the pre-stress strength ratio of bolts has no noticeable effect on the structure stiffness, but it reduces the ultimate bearing capacity of the joint. A simplified calculation model for the elastic stage of the joint is established, and the estimation results are in good agreement with the experimental results.

• Journal of Welding and Joining
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• 제23권6호
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• pp.43-48
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• 2005

This work was carried out to obtain sound welds and to select a most suitable binary metal joint among three different dissimilar binary metal combinations such as Zr-4/Ta, Mo/Ta and Ti/Ta(seal tube/sensor sheath) joints fur the instrumented nuclear fuel irradiation test. To do this, Taguchi experimental method was employed to optimize the experimental data. In addition, metallography, micro-focus x-ray radiography and hardness test were conducted to examine the welds. From the weld bead appearance, penetration depth and bead width as well as weld defects standpoint, Zr-4/Ta joint is suggested for the circumferential joining between a seal tube and a sensor sheath. The optimized welding parameters based on Zr-4/Ta joint are suggested as well.

• 한국생산제조학회지
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• 제22권4호
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• pp.665-672
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• 2013

With the development of advanced processing technology, laser processing systems, which require high-quality precision processing, have attracted considerable attention. Although laser equipment is expensive, it enables quick processing and less deformation of materials. This technology is often applied to secondary batteries, which has thus farinvolved the use of argon tungsten inert gas (TIG) welding. However, the welding characteristics of argon TIG welding are not yet good, and a laser is used for welding to address this problem. In this study, lap-joint welding was conducted, and the desired welding characteristics were obtained when the laser power was 1800W and the laser beam travel speed was 1.8 m/min. Lap-joint welding was conducted on Ni-coated SS41. Two cases were compared. No pores were observed in the Ni-coated SS41 lap-joint welding part, and cracks appeared from the lap-joints. Moreover, the pole rod and tap were welded together in a T-joint form to improve the output of the secondary battery. T-joint laser welding showed better welding characteristics than TIG welding.

• 한국공작기계학회논문집
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• 제11권6호
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• pp.31-37
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• 2002

This paper presents a new motion control strategy for singularity avoidance in 6 DOF articulated robot manipulators, based on a speed limiting algorithm for joint positions and velocities. For a given task, the robot is controlled so that the joints move with acceptable velocities and positions within the reachable range of each joint by considering the velocity limit. This paper aims at the development of a new efficient method to control robot motion near and at singularities. The proposed method has focused on generating the optimal joint trajectory for a Cartesian end-effector path within the speed limit of each joint by using the speed limit avoidance as well as the acceleration/deceleration scheme. The proposed method was verified using MATLAB-based simulations.

• 한국경제지리학회지
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• 제15권4호
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• pp.550-569
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• 2012

본 연구에서는 중국 베이징시(북경시(北京市)) 중관촌(中關村) 클러스터를 사례로 첨단산업 연구개발 네트워크의 특성을 기업간, 산 학, 산 연, 산 관에 초점을 두고 고찰하였다. 분석결과는 다음과 같다. 중관촌(中關村) 클러스터 기업의 국제경쟁력을 제고시키기 위해서는 연구개발의 강화가 요구된다. 기업의 연구개발 네트워크 실태를 조사한 결과를 살펴보면, 조사 대상 기업들은 현재에도 어느 정도는 연구개발 네트워크가 활성화되고 있다. 특히 기업의 협력 대상별 연구개발 네트워크의 내용에 있어서 차이는 있으나, 기업들은 다양한 내용으로 연구개발 네트워크를 이용하고 있다. 그러나 연구개발 네트워크가 어느 정도 자리잡은 수준에 이르고 있지만 아직까지 기업들이 연구개발 네트워크를 구축하는데 많은 애로가 있는 것이 사실이다. 따라서 본문은 기업들이 연구개발 네트워크를 형성하는데 애로점을 해결하기 위해 개선방안을 제시하였다.

• 로봇학회논문지
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• 제9권4호
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• pp.264-271
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• 2014

In this study, we have developed the humanoid joint modules which provide a variety of service while living with people in the future home life. The most important requirement is ensuring the safety for humans of the robot system for collaboration with people and providing physical service in dynamic changing environment. Therefore we should construct the mechanism and control system that each joint of the robot should response sensitively and rapidly to fulfill that. In this study, we have analyzed the characteristic of the joint which based on the target constituting the humanoid motion, developed the optimal actuator system which can be controlled based on each joint characteristic, and developed the control system which can control an multi-joint system at a high speed. In particular, in the design of the joint, we have defined back-drivability at the safety perspective and developed an actuator unit to maximize. Therefore we establish a foundation element technology for future commercialization of intelligent service robots.