• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2011.11a
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• pp.46-48
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• 2011

선원들은 '배'라는 한정된 생활공간에서 공동생활을 하면서 선원만의 특수한 생활형태를 형성하고 있다. 즉 선원근로자들은 선상작업을 통하여 통일적이고 협동적인 과업수행을 요구 받으며, 바다라는 고립적 환경에서 장기간 단조로운 집단생활로 인하여 상당한 스트레스에 노출되어 있을 것으로 예상된다. 또한 선내의 환경은 운항에 따른 높은 수준의 소음과 선체의 동요, 한랭과 폭염, 습도 등에 노출되어 있으며, 장시간 격리된 채 바다에서 생활함으로써 가족, 친구 등과의 교류의 기회가 제약됨으로써 이러한 요인들 또한 스트레스로 작용할 가능성이 높은 직업군이다. 본 연구에서는 선상환경에서 선원들의 스트레스 요인과 그 대처방안을 모색하고자 그 기초조사로써 예부선 선원근로자의 직무스트레스와 직무만족도 조사를 실시하였다.

• KIEAE Journal
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• v.4 no.3
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• pp.37-44
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• 2004

In this study, foreign and domestic noise criteria on walls, floors, and water supply facilities were reviewed and the results are as follows : regulation can be divided two things, one is on thickness the other is sound insulation performance. Green Building regulation based on the law and this have sound classification systems. Since these regulations are not established in Korea. The noise regulation on water supply-drain facilities and domestic guideline on interior noise level is needed. Foreign regulations are stricter than those of ours. And those has sound classification system for the better acoustic condition of inhabitants'.

• Magazine of the Korea Concrete Institute
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• v.10 no.1
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• pp.171-178
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• 1998

본 연구는 폴리우레탄 콘크리트 패널의 바닥재로서의 이용 가능성을 검토하기 위하여 수행되었다. 따라서 각종 요구되는 성능에 부합되는 배합을 달리한 폴리우레탄 콘크리트를 제작하여 각종 물성 실험을 실시하였다. 또한 폴리우레탄 콘크리트 패널을 제작하여 직접 현장에서의 시공한 수 바닥충격음 실험을 실시, 그 효과를 평가하였다. 실험결과, 폴리우레탄 콘크리트의 성능과 코스트의 밸런스가 적절하게 확보된 최적배합비를 도출할 수 있었으며, 특히 기존 바닥구조에 비해 공동주택의 층간소음을 어느 정도 줄일 수 있고 동시에 시공공정의 단축과 단열효과로 보다 더 우수한 바닥난방구조를 제안할 수 있다.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2006.04a
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• pp.805-812
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• 2006

An optimization formulation is proposed to minimize sound pressures in a two-dimensional cavity by controlling the attachment area of unconstrained damping materials. For the analysis of structural-acoustic systems, a hybrid approach that uses finite elements for structures and boundary elements for cavity is adopted. Four-parameter fractional derivative model is used to accurately represent dynamic characteristics oJ the viscoelastic materials with frequency and temperature. Optimal layouts of the unconstrained damping layer on structural wall of cavity are identified according to temperatures and the amount of damping material by using a numerical search algorithm.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2019.05a
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• pp.107-108
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• 2019

The interlayer noise of the apartment house is a typical problem that reduces the quality of the residential environment. Therefore, many researchers have developed soundproofing materials that blocks noise between floors. However, most development technologies do not have the noise cut-off effect felt by residents, and may also have a defect in long-term deflection. In this respect, this study developed high-performance interlayer soundproofing material that can overcome existing problems. The developed technology has the noise reduction effect experienced by the residents and it has high durability without long-term deflection. Therefore, high-performance interlayer soundproofing material is expected to contribute to reducing disputes over noise between floors of apartment residents.

• 전기의세계
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• v.39 no.9
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• pp.46-53
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• 1990

대용량 고속기의 경우는 기계적인 강성, 냉각, 열적해석, BALANCING(진동), 소음, 축의 위험속도 처리등의 이론적 해석과 이것의 응용 및 이론을 근거로한 체계화된 제조기술의 KNOW HOW에 따라 성공여부가 결정된다고 할 수 있겠다. 금번 패사의 대용량 고속기의 제작으로 국내적으로는 지금까지 수입에만 의존해온던 화력, 열병합 발전소, 제철, 제강, 시멘트 등의 대용량 부하가 요구되는 산업장의 대용량 및 고속전동기의 국산화가 가능하게 되었으며 국외적으로는 일본 및 구미지역으로도 수출할 수 있는 길을 열었다고 보아진다. 그러나 국내 각 산업장의 대용량, 고속기의 국산화에 있어서는 사용자의 국산화로의 전향적인 자세와 MAKER의 기술력이 부합될 때에만 가능하다고 할 수 있으며 이것이 향후 국내 중전기 업계의 기술 발전의 향방을 가름한다고 할 수 있겠다. 또 고장력 규소강판, 축재, ENDRING소재, ROTOR BAR, BEARING등 중요자재의 국내 구입시 많은 어려움을 겪었으며 납기, 가격에 관계없이 국내 제작 자체가 불가능한 품목도 있었다. 앞으로 중전기기 업계는 이러한 어려움을 공감하고 소재 및 부품(완제품) MAKER의 공동 개발 및 육성으로 대처해 나가야 할 것이다.

• Proceedings of the KSPS conference
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• 2003.05a
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• pp.27-31
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• 2003

음성정보기술 산업을 효과적으로 지원하기 위해서는 상품 및 기술의 개발을 위한 표준화된 음성 코퍼스의 구축 및 보급이 필수적이라고 할 수 있다. 본 논문에서는 음성정보기술산업지원센터(SiTEC)의 1∼2차년도 (2001. 5. 1 ∼ 2003. 4. 30)의 사업기간 중에 구축된 음성 코퍼스의 현황 및 향후 계획을 소개한다. 전통산업분야에 대한 음성정보기술 적용확산을 위한 자동차 소음 및 대규모 다채널 자동차 음성 코퍼스, 수출지원을 위한 다양한 외국어 음성 코퍼스, 방음실 환경에서의 인식 및 운율 합성 연구용 코퍼스, Dictation용 음성 코퍼스, 아동용 음성 코퍼스 등의 구축 내용이 소개된다.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2022.04a
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• pp.63-64
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• 2022

Inter-floor noise in an apartment building is a serious problem that causes conflicts between tenants. Accordingly, there are various attempts to solve this problem, but it is not easy to find a clear solution. Therefore, in this study, a soundproofing material between floors was developed that can improve the sagging that occurs after construction. And as a result of testing the developed interlayer soundproofing material, both light weight and weight were grade 1. And it was analyzed that maintenance performance could be improved with integrated structural characteristics.

• Korean Journal of Construction Engineering and Management
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• v.23 no.6
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• pp.30-42
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• 2022

OSC is a type of supply chain and value chain that spans the entire process of construction production (planning, design, construction, maintenance, etc.). It is a method of producing the final object by manufacturing it in a factory, transporting it to the site, installing and construction. This research as is the construction cost was compared for each case A, which applied the PC method, and case B, which applied the RC method. In the case of applying the PC method (excluding the PC design cost), compared to the case where only the RC method was applied, the frame construction cost per unit quantity (m³) increased by about 70% (50% based on the total RC construction type). Of the total frame construction cost of PC method application, PC accounted for 90.2%, 'PC manufacturing cost' 54.8%, 'PC assembly cost' 28.5%, and 'transportation cost' accounted for 6.89%. Also a decision-making framework that can consider both costs and benefits was established. In the case of benefits, the construction period, defect repair, disaster occurrence, energy efficiency, noise/dust/waste, and greenhouse gas emission indicators reflecting OSC technical advantages were presented. It can contribute to providing a basis for helping decision-making on the introduction of PC apartment houses using OSC.

• Journal of the Korea institute for structural maintenance and inspection
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• v.28 no.1
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• pp.32-38
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• 2024

In the case of apartment building, it is difficult to conduct non-destructive testing due to the actual presence of people and the dust and noise generated during the core test, so inspections are performed each time in the common area and underground parking lot, and the tests are conducted on the finishing material rather than on the concrete surface due to low-cost orders. As the process progresses, poor inspection is inevitable. In addition, the proposed formulas for strength estimation have large fluctuations depending on the differences in test conditions and environments, and even if they show the same measured value, the deviation between each proposed formula is large, making it difficult to accurately estimate strength, making it difficult to use. Accordingly, we would like to select finishing materials mainly used in apartment complexes and compare and evaluate the compressive strength of concrete according to the type of finishing material by using non-destructive testing methods directly on the finishing materials without removing the finishing materials. The reliability evaluation results of the estimated compressive strength of concrete using the ultrasonic velocity method according to the type of finishing material are as follows. The error rate between the estimated compressive strength and compressive strength derived through the ultrasonic velocity method shows a wide range of variation, ranging from 21.83% to 58.89%. The effect of the presence or absence of finishing materials on the estimated compressive strength was found to be insignificant. Accordingly, it is necessary to select more types of finishing materials and study ultrasonic velocity methods according to the presence or absence of finishing materials, and to study estimation techniques that can increase reliability.