• Journal of the Korean Professional Engineers Association
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• v.34 no.1
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• pp.27-34
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• 2001

On 16Dec. 1999, It was 100 years since the opening the first railroad section of 33.2km on Sep. 1899, Korea High Speed Railroad had a successful trial run of 200km/h on test track section. And the test speed 300km/h was achieved an 28 June 2000 during continuous commissioning. In the 21st century, the High Speed Railroad will be opened commercially in Korea and will contribute to technical development. Now, it is necessary to re-evaluate the role of railroad in modern society and to activate the railroad system. Ultimately, the competitive power of nation will be strengthened with energy saving, reduction of pollution and transportation cost. It conclusion the railroad system have to be expaned about 50% of total transportation to make preparations for reopening of Eurasia silk route through KyungEu railroad connection.

• Proceedings of the KSR Conference
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• 2008.06a
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• pp.1172-1181
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• 2008

The industrialized country is progressing the front picture of the High Speed ENU and research for the space design. especially, A Streamline nose design for a technology and competitive power confirmed report is important. This research set up the designing process for a streamline nose model development through scientific assessment. We reflected the needs of the user and presented also a human engineering the space design. This research presented the key point to establish an identity confirmed of a Korea High Speed ENU.

• 유체기계공업학회:학술대회논문집
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• 2003.12a
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• pp.323-323
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• 2003

Many recent development activities suggest the possibility of a high-speed turbo(centrifugal) compressor or blower for the industrial application of compressed air supplying system when used with the most advanced high-speed motor, inverter technology, and advanced bearing for high rotational speed. The problems to be overcome are of reliability, the application of mass production methods, cost effective manufacture and competitive running costs. This presentation is not focused on a specific technology advances but on an overall review of our recent experiences while we have developed the high pressure turbo blower for the commercial purpose.

• Proceedings of the KSR Conference
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• 2009.05b
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• pp.535-544
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• 2009

Korea holds the High-speed EMU technique and produced to the forth in the world. Also, Preparing an advance opportunity to the world market. especially, We must develop the Original form individually to have competitive power about industrialized country of a high-speed train. This research proposed a design development process which consider interior design to enhance a line of flow and efficiency from implementation of shape about the Streamline nose.

• Proceedings of the KSR Conference
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• 2004.06a
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• pp.375-379
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• 2004

The purpose of this study is to analyze the evolution of mobility after the commercial opening of french TGV through an examination on the precedent studies. The result of this study is as follows: Firstly, the TGV is competitive against the airplanes and automobiles within the 2 or 3 hours' service area, especially in the business trip markets. But in the recreational trips over this service area, 3 or 4 hours, the TGV remains as an important mode of transportation. Secondly, in a range within approximately 200 km, 1 hour by TGV, the french high speed train is not competitive against the automobiles by the lack of flexibility and commodity which are normally providing by the automobiles. This study shows the importance of permanent monitoring system on the KTX travellers' behavior to strengthen the market share of KTX.

• Korean Journal of Applied Biomechanics
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• v.23 no.2
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• pp.91-97
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• 2013

The purpose of this study was to compare the effect of a new warm-up condition, overloaded arm weights (721 g each arm, [OA]), on the bat speed during warm-up and immediately after warm-up with traditional warm-up conditions such as no-extra mass warm-up (control condition, [CO]) and overloaded bat warm-up (885 g donut on a bat, [OB]) conditions. Twenty male subjects who had competitive baseball experience participated in this study. Electromagnetic motion capture system was used to capture body segment motions. Results indicated that the OB showed significantly slower bat speed than the CO and OA did during warm-up (p<.05) and the bat speeds of OA and OB were similar. There was no main effect of different types of warm-up condition on the bat speed at post-warm-up swings. However, the first trial immediately after the OA and OB showed significant slower than the later trials (p<.05). Conclusively, the overloaded arm weights and overloaded bat did not show statistical superiority than the standard warm-up conditions in the deck circle and recovery time more than 3 minutes after loaded warm-up is recommended.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.24 no.3
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• pp.348-354
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• 2015

Using a magnetic gear, the speed and torque of the driving axis can be decreased and increased, respectively, similar to a mechanical speed reducer. In particular, because the driving side can be isolated mechanically from the load side, the magnetic gear was developed for application with environmental constraints. Of the existing topologies used for the magnet gear, the filtering method of a specified magnetic component is the most competitive. In this paper, a novel unified harmonic modulator is applied to filter the specified component. The torque conversion method using this modulator is described in detail, and the key factors of the modulator are derived from the influence on the resulting torque. The experimental setup was constructed and its torque transmission efficiency measured for varying loads. The transient characteristic from an excessive load is compared with the theoretical simulation.

• Proceedings of the KSR Conference
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• 1998.11a
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• pp.152-160
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• 1998

Korea Railway aims to be the most important public transportation for nationwide basic industries in 21st century. It is urgently necessary for us to construct economical railway network and to strengthen(strengthen) its competitive power in advance. In this paper the economical construction of railway network in Germany will be introduced. They lay emphasis on train speed and higher efficiency of railroad track.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.30 no.2
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• pp.23-28
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• 2007

"Getting to market first" is extremely critical in this competitive business environment. The speed at which products are developed and released to market is tightly linked to profitability and market share. Many companies that have been very skeptical of Rapid Tooling (RT) technologies developed so far are working on Hybrid Tooling (HT) that can really meet the market standards. This paper describes the experimentation how HT process has been being successfully established and effectively applied with typical case study. Through the experimentation, Ceramic-filled HT was found to be aptly suited for the low grade mold, both in terms of the lead time, dimensional accuracy, and tooling cost.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2009.05a
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• pp.145-147
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• 2009

The benefits of hydroforming technology are known as weight and cost savings through part consolidation and reduced post-forming processes such as welding and piercing. Hydroforming technology has some weaknesses in terms of process cycle times. But, as the hydraulic system and process designs are continuously developed, the cycle time is also reduced to acceptable and competitive levels. Hot air bulging is one of recently developed hydroforming techniques. Hot air bulging in order to further extend the forming degrees of Al lightweight material is investigated. A heated tube is placed in a heated die and sealed at the ends by sealing cylinders. The tube is subsequently expanded against the die cavity wall by internal pressure provided by air medium. The result of this study shows that axial feeding speed and air pressure have an effect on formability of Al air bulging at elevated temperature.