• 한국전산유체공학회:학술대회논문집
• /
• 2010.05a
• /
• pp.131-135
• /
• 2010

In the present study, the effects of the stagger angles on the aerodynamic performances in the vaned centrifugal compressor has been investigated by CFD methods. The diffuser vane angles were vane angles were varied in the range of ${\pm}10$ deg. from the intial-design points. The commercial Navier-Stokes solver, ANSYS-CFX were applied to solve the impeller-diffuser flowfields. Through the numerical results, the desirable setting angles were proposed to fit the best performance to the variation of the operating conditions.

• Journal of computational fluids engineering
• /
• v.15 no.3
• /
• pp.60-65
• /
• 2010

In the present study, the effects of the stagger angles on the aerodynamic performances in the vaned centrifugal compressor has been investigated by CFD methods. The diffuser vane angles were varied in the range of ${\pm}10$ deg. from the initial-design points. The commercial Navier-Stokes solver, ANSYS-CFX were applied to solve the impeller-diffuser flowfields. Through the numerical results, the desirable setting angles were proposed to fit the best performance to the variation of the operating conditions.

• Proceedings of the KSME Conference
• /
• 2000.11b
• /
• pp.391-396
• /
• 2000

The present experimental study is focused on the application of multi-point simultaneous measurement by PIV(Particle Image Velocimetry) to guide vane region within a diffuser pump. Various different kinds of clearance were selected as experimental conditions. Optimized cross correlation identification to obtain velocity vectors was implemented with direct calculation of correlation coefficients. Fine optical setup important in PIV performance is arranged for the accurate PIV measurement of high-speed complex flow. Various flow patterns are represented quantitatively at the stator passages.

• Monthly Korean Chicken
• /
• s.133
• /
• pp.124-128
• /
• 2006

최근 계사 내 바닥관리의 중요성과 더불어 자리깃의 관리가 중요시되고 있다. 소비자의 계육에 대한 까다로운 품질의 요구가 증가되고 있고, 2007년 개체 포장 실시에 따라 유통의 변화에 따라 닭고기의 품질이 더욱 중요시되고 있기 때문이다. 따라서 품질 좋은 닭고기 생산을 위해서는 사육 환경 개선이 필수적인데, 현재 우리나라 계사들의 노후화가 빠르게 진행되고 있다. 일부 농가들이 선도로 시설 재투자 및 닙플 급수기, 단열 및 환기 등 계사 환경개선을 획기적으로 리모델링하여 여러 농가에 희망을 주고 있으며 이런 붐을 타고 많은 농가가 개선을 서둘고 있는 상황이어서 다행한 일이라고 볼 수 있다. 하지만, 이제는 계열사가 주도하여 농가에 지속적인 투자를 독려하고 시설에 대한 개선을 해야 한다고 판단된다. 최근 닭고기 품질과 관련하여 각 계열사는 그 동안 사각지대였던 사육의 환경개선에서 그 해법을 찾고자 노력하고 있지만, 주변 환경과 농가들과의 수익 변수 때문에 항상 평행선을 달려 왔다. 그러나 이제는 성숙한 대화와 조심스런 개선책을 함께 공유해야 할 것이다.

• Transactions of the Korean Society of Mechanical Engineers B
• /
• v.25 no.10
• /
• pp.1293-1302
• /
• 2001

It is generally known that radial vane blowers with vaneless diffuser may generate mostly only a rotating stall but backward curved vane blowers may do both an impeller and a diffuser rotating stalls. In this study, it was found from the numerical and experimental results that the diffuser rotating stall does not appear in a radial vane because of the suppression for the diffuser stall appearance by occurring of impeller rotating stall in a large flow rate coefficient. The diffuser rotating stalls occurring when the width of diffuser is broaden fur a backward curved vane blower are classified definitely by the diffuser flow rate coefficient defined by adopting the varying diffuser width.

• Proceedings of the Korean Society of Computer Information Conference
• /
• 2023.01a
• /
• pp.213-215
• /
• 2023

본 논문은 "PBTI"라 명명한 웹사이트를 설계하고 구현한다. 요즘 유행하는 성격 유형 설문조사인 MBTI에서 영감을 받아 피부타입과 퍼스널 컬러를 검사할 수 있는 온라인 쇼핑몰 웹사이트를 제작하게 되었다. 체계적이고 다양한 질문을 통해 사용자들의 피부타입을 검사하고 해당 피부타입 결과에 따른 상품을 추천해주는 알고리즘이 탑재되어 사용자에 맞는 상품을 추천해준다. PBTI의 이러한 기능들은 다른 온라인 뷰티쇼핑몰과 극명한 차별점을 만들고, 쇼핑몰 매출을 크게 증대시킬 것으로 기대한다. 데이터베이스를 구축하기 위해 오라클을 이용하였고, 웹페이지를 구현하기 위해 스프링을 이용하였으며 팀원들과의 협업을 위해 깃허브를 사용하였다.

• Proceedings of the Korean Society of Environment and Ecology Conference
• /
• 2010.10a
• /
• pp.85-88
• /
• 2010

• Proceedings of the Korean Society of Environment and Ecology Conference
• /
• 2005.04a
• /
• pp.171-172
• /
• 2005

• Transactions of the Korean Society of Mechanical Engineers B
• /
• v.39 no.3
• /
• pp.207-214
• /
• 2015

The preliminary design of a radial inflow turbine using R134a as the working fluid at 5 kW of power for application to ocean thermal energy conversion (OTEC) is performed to obtain the trends for the efficiency and geometrical dimensions of the turbine. Using input conditions that included a turbine inlet temperature of $25^{\circ}C$, an outlet static pressure of 4.9 bar, and a mass flow rate of 1.16 kg/s, the results of a mean flow analysis show the major dimensions of the turbine, along with an angular velocity of 12,820 rpm. Based on these results, a three-dimensional turbine model is constructed for a computational fluid dynamics (CFD) analysis. The flow characteristics inside the turbine, including the volute and nozzle, are investigated using the CFD software ANSYS CFX. For a pertinent number of nozzle guide vanes, ranging from 10 to 15, the turbine efficiency was higher than 80%, with the highest efficiency shown by a nozzle with 15 guide vanes.

• Journal of the Korean earth science society
• /
• v.27 no.5
• /
• pp.579-584
• /
• 2006

A fossil feather found from the Late Pleistocene sediments of Jeju Island, Korea is described. The sediments deposited in a shallow marine environment yielded numerous footprints of diverse birds and mammals including hominids. A fossil feather well-preserved as a thin white film on the light gray mudstone is part of a vaned flight one. Although the specimen is relatively small in size (10.3 mm long and 9.0 mm wide), a rachis with two flat vanes and nearly parallel curved barbs with numerous proximal and distal barbules are well preserved. The specimen represents the first record of a fossil feather from Korea and is also the first record of feather from the Pleistocene deposits in the world.