• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.2
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• pp.653-659
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• 2014

Computer simulation has been performed to optimize cold forging process of automotive LPI fuel filter housing. A mold and the test product have been manufactured considering the strain and load distribution during the cold forging process. Also, fuel flow simulation has been performed to analyze flow characteristics of existing model and new model. Simulation result shows that two models have equivalent pressure drop. Compared with the mass of existing product, raw material reduction of 16 g and 30.5 g has been achieved from the upper and lower housing, respectively. Total mass reduction of the new housing was 46.5 g. Leak test and internal pressure test have been performed to verify the safety standard and test results were satisfactory.

• Journal of the Korean Society of Propulsion Engineers
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• v.18 no.2
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• pp.35-41
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• 2014

A rotordynamic analysis is performed for a turbopump of 7 ton class liquid rocket engine considering bearing housing structural flexibility. Stiffness and damping characteristics of ball bearings and pump noncontact seals are reflected in a rotordynamic model. A dynamic model of bearing housing with lumped mass and stiffness is also applied to the rotordynamic analysis. Rotor critical speed and onset speed of instability are predicted from synchronous rotor mass unbalance response and complex eigenvalue analyses. The bearing housing structural flexibility effect on rotordynamic characteristics is investigated for both of bearing loaded and unloaded conditions respectively. From the numerical analysis, it is found that the effect of the housing structural flexibility significantly reduces the rotor critical speed and onset speed of instability.

• Information Systems Review
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• v.14 no.2
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• pp.47-63
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• 2012

The concept of data warehousing was born in the 1970-80s at the same time when Wal-Mart's growing database gave birth to its need to view records in a more effective way. As the world's largest retail warehouse, Wal-Mart represents the world's largest data warehouse. A large portion of the discussionaround Wal-Mart's database management heretofore has only been process-centric, however, not its data per se. The study largely involves technical concepts around database and takes a deep look at Wal-Mart's chronicle of pre-implementation (preparation), implementation, and post-implementation (evaluation) of the data warehousing project. The highlight underlies how Wal-Mart acted against solving endless problems and was able to gear their data management to business contribution. By revisiting their data warehousing project case from a current point of view, we expect their lessons to be still available and applicable. With the renewed interest in (big) data and business intelligence, Wal-Mart's high respect for data and technology holds a lot more meaning than a couple of decades ago.

• Journal of Internet Computing and Services
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• v.25 no.2
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• pp.113-122
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• 2024

Recently, cutting-edge ICT technologies such as artificial intelligence, blockchain, edge computing, and the Internet of Things have been applied in various fields to create new services and a new digital era. Along with these technological developments, various policies are being implemented in Korea to transform the country from a "Smart City" to a "Platform City". We can create new services and values by linking with the Smart City Integrated Platform and Smart Housing Platform. This paper defines a linkage scenario between a Smart Housing Platform and the Smart 119 Emergency Dispatch Support Service, one of the Smart City Safety Nets. We propose a data transmission protocol and a metadata schema for data exchange between the Smart Housing Platform and the Smart City Integrated Platform to provide the Smart 119 Emergency Dispatch Support Service.

• Proceedings of the KIEE Conference
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• 2005.07a
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• pp.612-614
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• 2005

국내 배전계통에 90년대 중반이후 초기에 도입된 외국산 및 국산 폴리머애자를 현장에서 발취하여 특성을 평가하였다. 외관 관찰, 하우징의 발수성 및 경도, 전기적 특성, 하우징 재질의 변화특성 둥을 시험 평가하였다. 평가 결과 하우징은 발수성이 상실되었으며 표면에 열화가 진행되었다. 그러나 애자의 성능은 양호한 것으로 나타났다.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.768-769
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• 2015

본 논문에서는 3상, 1250MVA, 345kV급 전력용 변압기의 하우징 영역에 대한 온도상승 연구를 유한요소법과 시험을 통하여 수행하였다. 하우징 영역에 대한 전자계 요한요소 해석을 통해 와전류 손실을 수행하였고, 이를 열원으로 하여 변압기 내 외부 냉각조건을 고려하여 온도상승 분포와 최고온도 상승 값을 해석하였다. 이를 제작된 변압기를 대상으로 온도센서 및 열화상 카메라를 이용한 측정 데이터와 비교하여 검증하였다.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2011.10a
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• pp.649-649
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• 2011

미러 하우징에서 발생하는 윈드노이즈는 다양한 종류의 발생원인을 가지고 있다. 'A'-필라 와동과의 간섭으로 발생하는 것에서부터 하우징 자체의 형상 파라미터와 관련한 소음, 작은 부품간의 매칭상태에 따라 불리한 조건에서 발생하는 소음 등이 있다. 본 연구는 제조과정이나 조립과정에서 발생하는 소음이 아닌 순수 형상 변화에 따라 유동장과 소음장에 어떤 변화를 야기하는지에 대한 것으로 한정 지었으며 대표적인 디자인 파라미터 별 유동장과 소음장에 미치는 영향의 대소를 조사하였다. 조사 방법은 상용 CFD 툴인 PowerFLOW 해석을 통해 유동장 및 소음장에 대한 상세한 분석을 수행했으며 미러 디자인 측면에서 참고할 가이드를 제시하고자 했다.

• 보일러설비
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• s.182
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• pp.106-113
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• 2009

• 보일러설비
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• s.98
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• pp.95-106
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• 2002

• 석재인
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• no.2
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• pp.9-9
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• 2003