• 대한조선학회 특별논문집
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• 대한조선학회 2011년도 특별논문집
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• pp.75-81
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• 2011

An indirect concept and method is proposed to predict the paint dry time at the inside wall of ship block. To implement this concept on computer program, optimal hot air supply-exhaust system of paint dry facility was designed by CFD simulation and experiment was performed to get the paint dry time curve according to various paint dry conditions. After combining the block inside environment from the simulation results and the paint dry time prediction curve from the curve-fitting of experimental result, the GUI program which can be executed in general PC OS has been finally developed.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2015년도 춘계 학술논문 발표대회
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• pp.183-184
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• 2015

Recent structural approach of the House of Commons has been an increase in demand for dry wall light due to a change in load bearing composite structure of a flat plate type structure under the name of long-life housing, attach the attachment to the wall as the needs of the residents of reserved space increases things that are on the rise. However, depending on the strength of collapse accidents is shown wall and recent wall deposits are required, a load resistance evaluation method of the deposit of the need is the situation. Therefore, in this study, for the evaluation of the evaluation of dry lightweight wall as widely used gypsum board and ALC lightweight wall of two types of laboratory the wall through the previous studies to be installed in direct co-housing to the target and field experiments I want to evaluate the different points.

• 설비공학논문집
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• 제15권12호
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• pp.1018-1027
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• 2003

This study treats the analysis of the performance and the design of plume abatement wet/dry cooling tower with dry type heat exchanger using a numerical method. A two-dimensional analysis is performed using the finite volume method for mechanical draft counterflow and crossflow tower. For a coupling problem between water and air system, a turbulent two phase flow is considered. Effectiveness-NTU method is used for modeling of the dry type heat exchanger. The parameter change simulations of the outer wall shape, the relative flowrate of air, and attachment of an air mixer are performed to examine the effect on plume abatement. It is found that if the relative air flowrate ratio and the adequate air mixer type are chosen well in addition to the ratio of water to air flowrate, the loss of the cooling capacity and the additional cost are reduced and the plume is abated.

• Geomechanics and Engineering
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• 제3권4호
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• pp.255-266
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• 2011

Knowledge of seismic earth pressure against rigid retaining wall is very important. Mononobe-Okabe method is commonly used, which considers pseudo-static approach. In this paper, the pseudo-dynamic method is used to compute the distribution of seismic earth pressure on a rigid cantilever retaining wall supporting dry cohesionless backfill. Planar rupture surface is considered in the analysis. Effect of various parameters like wall friction angle, soil friction angle, shear wave velocity, primary wave velocity, horizontal and vertical seismic accelerations on seismic earth pressure have been studied. Results are presented in terms of tabular and graphical non-dimensional form.

• Geomechanics and Engineering
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• 제16권3호
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• pp.321-329
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• 2018

Classic braced walls use struts and wales to minimize ground movements induced by deep excavation. However, the installation of struts and wales is a time-consuming process and confines the work space. To secure a work space around the retaining structure, an anchoring system works in conjunction with a braced wall. However, anchoring cannot perform well when the shear strength of soil is low. In such a case, innovative retaining systems are required in excavation. This study proposes an innovative earth-retaining wall that uses in situ soil confined in dual sheet piles as a structural component. A numerical study was conducted to evaluate the stability of the proposed structure in cohesionless dry soil and establish a design chart. The displacement and factor of safety of the structural member were monitored and evaluated. According to the results, an increase in the clearance distance increases the depth of safe excavation. For a conservative design to secure the stability of the earth-retaining structure in cohesionless dry soil, the clearance distance should exceed 2 m, and the embedded depth should exceed 40% of the wall height. The results suggest that the proposed method can be used for 14 m of excavation without any internal support structure. The design chart can be used for the preliminary design of an earth-retaining structure using in situ soil with dual steel sheet piles in cohesionless dry soil.

• 한국전통조경학회지
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• 제41권1호
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• pp.21-34
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• 2023

본 연구는 13개 마을 옛 담장의 국가등록문화재 지정 당시 사용된 재료와 축조법을 파악하고, 현장조사를 중심으로 정비에 따른 옛 담장의 구조별 변화 양상을 고찰하였다. 연구의 결과는 다음과 같다. 첫째, 옛 담장은 토석담 10개소와 돌담 5개소로 구성되었으며, 지정 당시 자연석 메쌓기로 막쌓은 돌담은 비슷한 형태를 유지하는 비율이 높았지만, 토석담은 사용한 돌과 줄눈 및 맞댄 면 축조법에 따라서 담장별로 다양하게 변형되었다. 둘째, 옛 담장의 정비로 인해서 변화된 구간을 추출하고 재료의 대체와 첨가, 축조법의 변형 양상을 파악하였다. 지붕부는 내구성과 가격의 효율이 높은 시멘트 기와나 석면 슬레이트로 대체되고, 우수 유입을 막고자 한식 기와에 와구토가 첨가되었다. 벽체부의 자연석은 시공 편의에 따른 발파석, 마름돌, 가공 석재로 대체되고, 보수에 시멘트 블록, 시멘트 벽돌이 사용되었으며, 시멘트 모르타르가 도포되었다. 토석담의 막쌓기가 빗쌓기로 변형되고 찰쌓기는 메쌓기로 바뀌어 경관적, 구조적 문제를 야기하였다. 또한 기초부에 시멘트 모르타르층이 시공되어 자연석 메쌓기로 유도했던 우수의 흐름을 막아버렸다. 셋째, 이러한 정비 양상은 주거공간에 배치된 옛 담장의 속성상 소유주가 일상적 훼손에 대한 비전문적 보수를 반복하고, 문화재 지정으로 인하여 정비를 담당한 수리업체가 지역 재료를 수급하기 어려우며, 옛 담장에 대한 차별성있는 수리시방서가 적용되지 않는 환경에서 기인한다고 판단된다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2009년도 추계학술대회 논문집
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• pp.692-693
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• 2009

• 한국지진공학회:학술대회논문집
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• 한국지진공학회 2002년도 추계 학술발표회 논문집
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• pp.75-82
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• 2002

The Mononobe-Okabe method is generally used to evaluate the dynamic earth force for the seismic design of retaining walls. However, the Mononobe-Okabe method does not consider the effects of the dynamic interactions between the backfill soil and the wall. In fact, a phase difference exists between the inertia force and the seismic earth pressure. In this study, shaking table tests were peformed on gravity walls retaining dry backfill sand to analyze the influence of several parameters (the unit weight of the wall, the input acceleration and base friction) on the development of the seismic earth pressure. The experiments revealed that the magnitude of the inertia force mobilized during seismic loading affected the seismic earth pressure. The difference in the phase angles between the inertia force and the seismic earth pressure was retained at 180 degrees before the wall failed but its magnitude changed significantly as the wall began to fail.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2006년도 춘계학술발표회 논문집(I)
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• pp.530-533
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• 2006

This thesis investigates the behavior of precast wall systems with a new vertical connection which are proportioned by the displacement based design. The proposed precast wall systems are supposed to provide additional spaces and seismic strengthening in remodeling existing residential buildings. For a fast remodeling constructions using PC walls require an efficient, economic fabrication method. A C-type vertical connections for PC wall systems is proposed for transfer of bending moment between walls in the vertical direction while a shear key in the center of wall is prepared to transfer shear forces by bearing. The proposed vertical connection allows us easy fabrication because of different direction of slots at the edges of wall. The dimension of C-type connection components are determined by engineering models and a series of test.

• 비파괴검사학회지
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• 제31권3호
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• pp.278-286
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• 2011

The on-line monitoring for the wall thinning in secondary system has been considered one of main issues for the safety of nuclear power plants. To establish the on-line monitoring technique for the pipe wall thinning, the development of the ultrasonic transducer working in high-temperature is very important. In this investigation, the magnetostrictive transducer is concerned for high temperature condition up to $300^{\circ}C$. The magnetostrictive transducer has many advantages such as high working temperature, durability, cost-effectiveness, and shear waves, most of all. A thin Fe-Co alloy patch whose Curie temperature is over $900^{\circ}C$ was employed as a ferromagnetic material for magnetostriction. Wave transduction experiments in various temperature were carried out and the effect of bias magnets was considered together with the dry coupling performance of the transducer. From experimental results, consequently, it was found that the magnetostrictive transducer works stable even in high temperature up to $300^{\circ}C$ and can be a promising method for the on-line monitoring of the wall thinning in nuclear power plants.