• Journal of Welding and Joining
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• v.25 no.6
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• pp.44-52
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• 2007

A welding process of a lifting lug for lifting heavy objects is one of the important welding processes directly related to the safety in shipbuilding. Welding a lifting lug is done in the manually and takes about forty minutes. Working environment for the lifting lug welding is very poor due to an radiant heat and a harmful fume. The purpose of this study is to develop methods of multi-pass welding using the lifting lug welding robot system. This study shows robot welding methods to achieve proper corner, straight and connection welding and an effectiveness of application.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2011.06a
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• pp.925-926
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• 2011

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.18 no.1
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• pp.91-96
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• 2018

In this paper, dual axes waveguide rotary joint, which operates at high power and has low loss characteristic, is designed and fabricated for a Ka-band millimeter-wave small radar. Its electrical performance is verified through the S-parameter at room temperature, high power and operation temperature test. Rotary joint functionally consists of the mode converter transforming rectangular waveguide into circular waveguide and the choke at the rotation part. At the configuration design, linking a fixed transmitter to an antenna rotating dual axes electrically for minimum loss and light weight body are considered. In Fc(center frequency)${\pm}500MHz$, the designed rotary joint has VSWR 1.5:1 below return loss, -2.0 dB above insertion loss. It is found that rotary joint characteristics is similar to design results.

• Journal of Technology Innovation
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• v.8 no.1
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• pp.49-71
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• 2000

This paper looks at "network" aspects of research and development (R'||'&'||'D) with a special focus on small and medium (S'||'&'||'M) automotive part makers in Korea. It throws light on recent changes in the technological capability building mechanism of Korean automotive firms. The Korean automotive firms have mostly built up technological capability from scratch. It is widely acknowledged that they have benefited from two cooperative relations: namely (1) the close cooperative relationship with their own assemblers and (2) technical assistance from auto parts makers abroad. Too much emphasis on these two links can, however, keep us from understanding new developments. This paper argues that auto parts firms have diversified their networks for technological development. It is based on the analysis of the data drawn from the survey on technological development activities of small and medium sized firms, which was carried out by the Korea Federation of Small and Medium Business. Many automotive firms have recently increased joint R'||'&'||'D links with university and/or research institution while their reliance on foreign sources have decreased.

• Journal of Welding and Joining
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• v.35 no.1
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• pp.68-73
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• 2017

During welding of Ni based superalloy, hot cracking was usually happen in the fusion zone of a weld. In this study, the laser weldability of Inconel 713C alloy for the turbocharger wastegate valve (WGV) was evaluated with various welding conditions, such as laser power, welding speed, shielding gas. Welding conditions were optimized by bead-on-plate (BOP) and butt joint welding. For the evaluation of laser weldability, bead shapes and weld microstructures were investigated and tensile test was conducted. The fracture surfaces were investigated for the understanding the cause of the fracture.

• Korean Management Science Review
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• v.28 no.2
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• pp.75-92
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• 2011

This study investigates how cognitive and affective conflict affect performance and social outcomes in the new product situation. We examine the corporate, project, and personal characteristics that determine the level of inter-functional conflict between marketing and R&D. From a survey of Korean high-tech companies, we found : (1) time pressure was positively related to cognitive and affective conflict, (2) joint reward systems, interdepartmental connectedness, and years of education were negatively associated to cognitive conflict, (3) while cognitive conflict was positively related to new product creativity and NPD performance, affective conflict was negatively associated to marketing-R&D integration and perceived effectiveness of the relationship, as well as new product creativity and NPD performance.

• Proceedings of the KWS Conference
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• 2010.05a
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• pp.52-52
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• 2010

선박건조에 있어서 대형 블록의 조립이 이루어지는 선행 탑재 및 탑재 단계에서 Tank Top과 Upper Deck의 V 개선 용접은 FCAW+SAW의 복합용접이 실시되고 있다. 그러나 가장 범용적 모재 두께인 18~20t의 경우 SAW 시공에만 약 5~6Pass가 소요됨으로써 다급한 진수 일정에 많은 지장을 초래하고 있다. 또한 능률 향상을 목적으로 용착량 증가효과를 얻기 위해 철분말이나 절선와이어를 개선면내에 충진하고 용접을 수행하나 획기적인 용접능률을 기대하기 어렵고 용접사 기량에 따라 용접 결함이 발생될 수 있다. 이에 따라 용접패스 수를 줄이고 결함 발생이 없는 용접기법 개발이 절실히 필요하였다. 이를 위해 매우 간단하고 효율적인 위빙장치를 제작하여 선탑/탑재 아래보기 용접이음에 1~2패스의 SAW 용접법을 개발하여 용접생산성은 물론 용접품질까지 획기적으로 향상시키는 기술 개발을 완료하였다.

• Journal of the Korean Society for Precision Engineering
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• v.34 no.2
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• pp.139-143
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• 2017

Finite element analysis was performed for a split-type CFRP bicycle frame, which was designed to apply a compression molding process with carbon fiber prepreg for a conventional bicycle. An epoxy adhesive material for joining the frames was selected by the extent of stress at joint interfaces. The split-type bicycle frame was then formed and its weak parts examined by the boundary conditions according to reliability tests. The results verified the reliability of the bicycle frame after modification of these weak parts. The finished product was manufactured by using this developed split-type bicycle frame.

• Proceedings of the KIEE Conference
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• 2006.10a
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• pp.171-173
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• 2006

지중 전력케이블의 접속함은 금속보호관(Casing or Protective Tube)의 전기적 검토를 통해서 적정 단면적을 산정하여 고장시 고장전류를 흘려주어야 한다. 현재 국내외 금속보호관은 그 재료로서 Copper를 사용하고 있으나 현장에서의 시공성 및 취급 용이성 때문에 알루미늄 보호관으로 재질 변경이 이루어지고 있다. 본 논문에서는 기존의 Copper보호관과 Alumlnium보호관에서의 비교검토를 통해서 Aluminium보호관의 유효성을 검토하고 구리에서 알루미늄으로 재질 변경이 이루어 졌을 때 열적 제약조건을 고려하여 적정단면적을 재 산정한다. 또한 산정된 단면적은 단락시험을 통해서 그 유효성을 입증하였다.

• Asian Journal of Business Environment
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• v.8 no.1
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• pp.7-15
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• 2018

Purpose -This paper is to study the process of the negative effects of Sino-foreign joint ventures, hoping to find out an effective path in which local enterprises can avoid the risks in the utilization of foreign capital, and ultimately achieve independent innovation. Research design, data, and methodology -The outflow of assets, the loss of local brands and the "technology hollowing-out" problem brought by joint ventures is becoming more and more serious. Based on conflict analysis graph model, this paper takes Yuhuan joint venture as an example to identify the conflict problem in Sino-foreign joint ventures. Results -The results of the stability analysis show that establishing joint venture cannot really realize the introduction of technology because the technology is fully controlled by the foreign part. So when introducing foreign capital, local enterprises should participate in R&D and master the initiative. Conclusions - Local enterprises should pay attention to patent containment and technology blockade of multinationals. Domestic enterprises should try to protect state-owned assets and local brands in Sino-foreign joint ventures. Independent innovation is the most effective strategy for the development of enterprises in China.