• Journal of the Korean Society for Railway
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• v.8 no.3
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• pp.203-209
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• 2005

Y-form steel sleeper are currently enjoying a renaissance in Germany. Their use on ballast track proves hat-especially under extreme conditions and loads-they reliably help ensure high stability and a long service life of the track. In addition to conventional partly mechanised tracklaying methods, a new Method has been developed that for the first time enables Y-form sleepers to be laid on an assembly-line basis at a fast rate and with high quality.

• 유체기계공업학회:학술대회논문집
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• 2004.12a
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• pp.488-491
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• 2004

Numerical analysis of the three dimensional turbulent flow field in a complex valve shape is carried out to confirm the flow field whether the designed valve shape is good or not. The simulation of the incompressible flow in a constant flowrate control valve is performed by using the commercial code, FLUENT/UNS 6.0. The results of flow field show the designed valve has some problems, therefore these will be good data for new valve design.

• Proceedings of the KSR Conference
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• 2002.10a
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• pp.642-647
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• 2002

Y-form steel sleeper are currently enjoying a renaissance in Germany. Their use on ballast track proves that-especially under extreme conditions and loads-they reliably help ensure high stability and a long service life of the track. In addition to conventional partly mechanised tracklaying methods, a new Method has been developed that for the first time enables Y-form sleepers to be laid on an assembly-line basis at a fast rate and with high quality.

• Journal of Korean Society of Steel Construction
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• v.21 no.5
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• pp.545-552
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• 2009

An experimental study was performed on the yLRC composite column. Its external surface was manufactured with y-shape steel sheets and L-shape steel angles, and concrete was poured inside in the field. This composite column has improved the section capacity due to the composite action of steel and concrete, and provides good efficiency in reducing the terms of construction works because of its abridged formworks. The stub column specimens (three small and three large specimens) were tested through concentrical axial loading, and the effect of the width-to-thickness ratio of the steel angle on the column axial strength was examined. The axial strength and behavior of the composite columns were analyzed, and a formula for predicting the axial load capacity was proposed.

• Applied Chemistry for Engineering
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• v.3 no.2
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• pp.240-246
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• 1992

The electronic structure of oxygen atom of cation-exchanged zeolite was investigated by utilizing X-ray photoelectron spectroscopy(XPS). The obtained $O_{1S}$ spectra of $Na^+-$, $Fe^{2+}-$ and $Fe^{3+}-$ exchanged zeolite X and Y were deconvoluted to demonstrate electronic binding energy of framework oxygens. There were 2-3 bands in each spectrum. The characteristics of separated band have been studied in terms of binding energy and relative area of $O_{1S}$ electron with respect to the exchanged cation. Those bands were assigned to the bridged oxygen in framework (band 1), cation bonded oxygen in cationic site (band 2) and oxygen in water coordinated to the cation (band 3) each other. The band 1 occupying the majority area of $O_{1S}$ spectrum was shifted to higher region on binding energy according to the decrease of Al content in zeolite.

• Journal of Yeungnam Medical Science
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• v.6 no.2
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• pp.127-132
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• 1989

The upshoot and downshoot in Duane's retraction syndrome is believed to be related to a leash effect from the lateral rectus muscle. When the eye is rotated into the adducted position, the lateral rectus muscle slips over the globe, producing the up-and downshoot on adduction. The splitting of the ends of the lateral rectus into a Y configuration prevents the rotation of the globe up or down by stabilizing the muscle's position on the eye. Three patients with Duane's retraction syndrome demonstrated abnormal vertical movement on adduction and underwent a Y-splitting on the lateral rectus. In all patients, marked decrease in the up-and downshoot is noted after surgery.

• The Transactions of the Korean Institute of Power Electronics
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• v.20 no.3
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• pp.223-231
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• 2015

LEDs have been widely used in lighting displays, automobiles, and airplanes owing to their excellent light output characteristics and long lifespan. Though LEDs are manufactured under the same process, variations in impurity concentrations cause electrical deviation among LEDs. The resulting electrical deviation can not only reduce the life time of the LED but also cause non-uniform luminance of LEDs connected in parallel. LED driving circuit is required to solve these problems. In this paper, we propose a LED driving system using Y-type current balancing transformer to maximize the efficiency of the system by removing output stage Schottky diodes. Experimental results are presented to verify the performance of proposed LED driving system that is applied to 80 W LED modules.

• 한국가시화정보학회:학술대회논문집
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• 2004.11a
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• pp.80-83
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• 2004

This experiment has been carried out to measure the process of droplet formation between water phase fluid$(PVA\;3\%)$ and organic phase fluid(oil), Internal and External flow fields measured by a Dynamic Micro-PIV method Water-in-oil(W/O) droplets successfully generated at a cross junction and Y junction. Internal and external flow fields were measured when the droplet grew up, stretched and separated.

• Proceedings of the KAIS Fall Conference
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• 2000.10a
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• pp.36-38
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• 2000

NaY형 Zeoilte는 현재 그들의 촉매적 특성과 흡착성 그리고 이온 교환성들을 이용하여 산업에 중요하게 사용되어지고 있다 본 실험은 고온 스팀을 이용한 방법과 산처리에 의한 방법으로 탈알루미나의 효과를 확인하는 실험을 하였다 먼저 SiO₂/Al₂O₃ 몰비가 4-6인 합성 NaY zeolite를 분위기 소성로에 넣고 증기발생 장치를 이용하여 500℃에서 고온 스팀을 분위기 소성로에서 일정하게 주입하였다. 에에 따른 결과는 탈알루미나 처리 후의 XRF와 BET의 결과로 탈알루미나 처리에 따라서 SiO₂/Al₂O₃의 몰비가 20.6에서 21까지 증가한 것을 알 수 있으며 또한 BET의 결과에서 탈알루미나 처리에 의해서 비표면적이 증가한 것을 확인할 수 있으며 특히 meso pore area의 증가는 탈알루미나에 의해서 zeolite의 골격구조가 일부 파괴되었음을 알 수 있다.

• Journal of the Korean Society of Clothing and Textiles
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• v.26 no.7
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• pp.1026-1035
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• 2002

The purposes of this study were to classify the front view of trunk of adult males into several kinds of shape and to provide the characteristics and silhouette of each group which has same shape. As the sample, subjects were l290 males of 20 to 54 year-old. The procedure and results were follows; l. The principal component analysis was used to obtain the shape factor of the front of the trunk 8 factors in the front which explained 86.8% of total variance were extracted. 2. As the result of the cluster analysis of factor scores, the font of body was classified in 4 types. 4 types were named X, A, Y and H type in the front considering the characteristics of each type.