• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2019.05a
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• pp.5-6
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• 2019

조선 분야에서 디지털 트윈 구현을 위해 개방형 시뮬레이션 플랫폼을 개발 중이며, 시뮬레이션 모델 간의 인터페이스 표준 개발을 위해 기능 목업 인터페이스(FMI)를 사용하고 있다. 본 연구에서는 개방형 시뮬레이션 플랫폼과 기능 목업 인터페이스를 분석하여 에이전트 기반의 시뮬레이션 모델 연동 기술 개발 방안을 제안한다. 첫째로, 기능 목업 인터페스 표준 방식에 따라 에이전트 모델의 인터페이스 표준을 정의하고, 둘째로 에이전트 목업을 통해 기능 목업 인터페이스를 테스트 하며, 셋째로 전자해도 기반의 시뮬레이션 파라미터 조작 환경과 적용모듈을 개발하여 에이전트 모델 연동체계를 구축할 수 있다.

• Proceedings of the Korea Water Resources Association Conference
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• 2020.06a
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• pp.237-237
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• 2020

수도계량기(이하 "수량계")는 액체용 적산부피계로 물 사용량을 적산 계량하기 위한 기계기구 또는 장치이며 수량계 검정기준에 의해 검사기준 합격제품을 사용하서 수도요금을 징수합니다. 사실상 국내계량에 관한 법률에 의거하여 전이유량비가 6.3배수(2014년) > 4.0배수(2016년) > 1.6배수(2017년)로 점점 향상되며 2017년 기준으로 국제법정계량기구(OIML)의 성능과 같은 1.6배수까지 향상되어 국내의 수량계 기술기준이 많은 부분 향상되었습니다. 그러나 국제법정계량기구(OIML)는 현재 1.6배수의 80배수까지 검사기준에 합격에 반하여 현제 국내의 검사기준은 1.6배수의 100배수까지만 합격기준을 가지고 있습니다. 이러한 기준은 점차 발전해가고 있는 후발국가에 속하는 자국의 검사기준이 너무 갑작스럽게 국제법정계량기구(OIML)의 기준보다 높은 검사기준을 시행하며 많은 문제가 발생한 것 같습니다. 위와 같은 문제를 해결하기 위하여 여러 복합적인 부품으로 이루어진 수량계의 유량 및 유속에 영향력이 있다고 보여지는 특정 부품 혹은 부위의 개선 및 개발로 해결할 수 있지 않을까 하는 의구심에 연구를 시작되었습니다. 유량 및 유속에 영향을 끼치는 유입부의 스트레이너, 내부 임펠러의 변경으로 성능검사에서 영향을 끼치는지를 유체역학 및 유동해석 등을 통하여 테스트 후 각각 단계 및 상황별 목업금형을 제작하여 현재 국내검사기준으로 진행되는 성능테스트인 기차테스트를 진행하였습니다. 먼저 수량계의 특성상 수량계 내부의 유량을 유체역학 및 유동해석으로 정확히 뽑아내는 것이 불가능하여 유입부 유출부의 유량의 흐름을 기준으로 유체역학 및 유동해석을 진행하였습니다. 테스트 후 그 결과 값으로 유입부의 스트레이너의 삽입 각도를 0°, 90°, 135°, 180°, 270°로 각각 제작하여 테스트를 진행하였으며, 내부 임펠러는 straight, SR, SL, SL R70, SL R60, R75, SR R65 형상으로 각각 제작하여 테스트를 진행하였습니다. 전반적으로 기존의 수량계보다 높은 성능을 보여주었으며, 특정 스트레이너의 삽입각도 및 임펠러의 형상에서는 기존보다 훨씬 유수율이 절감되는 결과값이 나왔습니다. 그로 인해 검사기준에 쉽게 부합할 수 있으며 물 사용량을 보다 정확히 계측하여 정확한 수도요금을 부과하여 국세 낭비로 인한 경제적 손실을 감소할 수 있을 것 같습니다.

• Journal of the Korean Recycled Construction Resources Institute
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• v.9 no.4
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• pp.537-544
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• 2021

In order to describe the fill-up stages of a near-surface disposal facility vault, a mock-up test is performed, and its behavior during the fil l -up stages is investigated. On an in-site concrete foundation with a l ength of 6600mm, a width of 6600mm and a thickness of 400mm, a reinforced concrete disposal vaul t is manufactured with 4 precast (PC) corner wal l s and 8 PC side wal l s. 36 wasted drums are pl aced on the 1st fl oor in 6 by 6, and then the empty space is fil l ed with grout fil l er. These processes are repeated up to the 5th floor, and the verticality and the joint gaps are measured for each fill-up stage. The verticality is measured using a level at 6 positions on each side wall (3 positions on the left and right sides, respectivel y), i.e. a total of 24 positions on the 4 side wal l s. The joint gaps are measured at 9 positions on each side wal l (3 positions on the left, center and right sides, respectively), I.e. a total 36 positions on the 4 side walls. To measure the joint gaps, crack tips are installed on the left and right sides of every joint gap, and vernier calipers are used. The measured verticality obtained through the mock-up test was found to be ±0.1° based on the initial stage (ST0), and the result of the joint gap was up to 0.38mm. This appears to have a negligible effect on the structure.

• Journal of the Korea Institute of Building Construction
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• v.23 no.4
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• pp.465-476
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• 2023

This study introduces the development of a precast concrete double-wall, applicable to basement construction in apartment buildings. Unlike traditional precast concrete double walls, the developed double-wall doesn't require specialized manufacturing equipment such as a lathe. The constructability of these advanced technologies was validated through a full-scale mock-up test using the precast concrete double wall. The test specimens were constructed to represent a structural wall with a thickness of 250mm. It was observed that the quality of the in-situ concrete, filled between two single panels of 110mm thickness each, was excellent. The construction efficiency of the developed double-wall system for basement construction in an apartment building was also examined. Expert interviews about installation times of precast concrete elements were conducted to evaluate the speed of the basement floor's installation. The results showed that installation of precast concrete elements, including the proposed double walls, could be completed within 20 to 29 days for a basement in an apartment building. This indicates a three-fold increase in construction efficiency compared to traditional methods relying on in-situ casting.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• autumn
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• pp.491-494
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• 2003

Curtain wall (for the outside wall) must be designed and constructed to resist weather condition of nature like rain. wind and surrounding environment. So, Now days, Mock-up test of curtain wall's total capability is generally used for skycraft building. But, Mock-up test specification in korea is so weak that there are lots of disputation. Also, lacking of clearness in specification causes many trouble in adaptation. Therefore, I would like to consider the problem of Mock-up test specification by inspecting and comparing with other country's works. and I will mention the way of approvement in our specification.

• Journal of the Korean Recycled Construction Resources Institute
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• v.8 no.1
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• pp.72-78
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• 2020

The present study developed shotcrete for fiber-net integrated tunnel support system, which consists of fiber-net support materials including netlike fiber and shotcrete and integration technology between support materials. In addition, in order to evaluate the field applicability of the developed tunnel support system and compare with the performance of steel fiber reinforced shotcrete, mock -up test was conducted on the mock -up structure. The test results show that in the case of shotcrete containing coarse aggregate(S20A5RP10-C), the excessive rebound rate occurred as the secondary shotcrete was dropped during construction due to the degradation in bond performance with fiber-net. Also, in the case of steel fiber reinforced shotcrete, the amount of cast shotcrete fell short of target value due to the fiber ball and the degradation of pumpability. On the other hand, the amount of cast mortar shotcrete(S20A5RP10-M) and the installation position of fiber-net were almost close to the target values, and the lower rebound rate occurred compared to the steel fiber reinforced shotcrete.

• Journal of Korea Multimedia Society
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• v.13 no.11
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• pp.1715-1727
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• 2010

Although a hand haptic interaction which provides direct and natural sensation is the most natural way of interacting with VR environment, the hand haptic interaction has still limitations with respect to the complexity of articulated hand and related hardware capabilities. Particularly, virtual assembly simulation which refers to the verification process of digital mockup in product development lifecycle is one of the most challenging topics in virtual reality applications. However, hand haptic interaction is considered as a big obstacle, because difficulty initial grasping and non-dextrous manipulation remain as unsolved problems. In this paper, we propose that common hand haptic interactions involves two separate stages with different aspects. We present the hand haptic interaction method enables us to stably grasp a virtual object at initial grasping and delicately manipulate an object at task operating by one's intention. Therefore, proposed method provides the robustness using grasping quality and dextrous manipulation using physically simulation. We conducted experiments to evaluate the effectiveness of our proposed method under different display environments -monoscopic and stereoscopic. From 2-way ANOVA test, we show that the proposed method satisfies two aspects of hand haptic interaction. Finally, we demonstrated an actual application of various assembly simulation for relatively complex models.