• 한국가구학회지
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• 제21권1호
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• pp.26-39
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• 2010

This is a leading study to replace the structural analysis methodology on the specific traditional joint by a numerical analysis. Tests were carried out to test the compressive methodologies with the numerical results. The Japanese larch was used as a sample. The Orthotropic property of wood was specifically considered for the finite element numerical analysis. Linear numerical analysis and non-linear numerical analysis for the BEAM element and the two SOLID elements of ANSYS were used to analyze the compressive performance. In addition, more finely divided elements were used to raise the accuracy of the numerical result. Finally, the statistically significant differences were tested between that of the analytical and numerical results. It could be concluded that the SOLID 64 element shows the most optimum result when the non-linear analysis with the more finely divided element was used. However, finely dividing of the element is a considerable time consuming process, and it is quite difficult to raise the accuracy of the non-linear numerical analysis. Therefore, if considering the vertical displacement to be of the only interest, the BEAM element is more efficient than the SOLID element because the BEAM element is reflected as a simple line, which is less time consuming and difficult in dividing the elements. But, the BEAM element cannot accurately model the knot as a strength defect factor which is an important property in the orthotropic property of wood. Therefore, the SOLID element should be used to model the strength defect factor, knot, as it can be efficiently applied on the structural size flexure member which could be more strongly effected by the knot. In addition, it is useful at times when the failure types of members are to be more closely investigated, as the SOLID element is able to examine the local stress distribution of the member. The conclusion drawn by this study is of the good concordance between analytical results and numerical results of compressive wood members, but how orthotropic properties should only be considered. The numerical analysis on the specific Korean traditional joints will be based on the current study results.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2015년도 추계학술대회
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• pp.910-912
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• 2015

본 논문에서는 중장비나 댐의 수문 등의 적용된 유압 실린더의 변위(stroke)를 검출하여 유압 실린더의 정밀제어 또는 자동화를 위한 정전용량 센서(Capacitive Sensor) 및 변위 검출 시스템을 설계하였다. 기존 실린더의 변위 검출 방식인 코일을 이용한 자기장 센서, LVDT 센서 등은 높은 정확도에 비해 충격 및 진동 완화 또는 센서 보호 하우징(Housing) 등 부수적인 설비에 따른 높은 비용, 큰 부피와 같은 문제가 있다. 따라서 이러한 개선하기 위해 유압 실린더 내의 직접 적용되어 실린더의 변위 검출이 가능한 정전용량 센서를 설계하였으며, 설계한 정전용량 센서를 통하여 실린더의 변위에 따른 커패시턴스 값을 검출하여 실린더 위치 측정이 가능한 시스템을 설계 및 검증 하였다.

• 대한안전경영과학회지
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• 제20권1호
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• pp.11-21
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• 2018

Safety accidents, which are called industrial accidents in construction work, are often caused by unstable physical and personal conditions combined during preparation and execution of work. It is difficult to manage all the construction works, but especially in the field of apartment construction work, complex and many kinds of works are being carried out at the same time. In the current construction, safety regulations such as safety management guidelines are generally well maintained, but the execution of manpower resources that can fulfill them is limited, and it is difficult to reduce the accident rate and loss cost. Therefore, in this study, it is a reality that most of the types of construction work are under contruction by subcontracting contract, so they are limit by methods of manual maintenance and safety education. Currently, the subcontractor is also allowed to perform safety management through the composition of the safety management review body, but it is operated formally. So alternatives to this were studied. As a result, safety accidents occur in the subcontractor's worker due to vertical integration, which is characteristic of the construction industry, together to the contractor, the safety management system is based on a safety construction system in which a worker who has a certain qualification condition such as career experience of the work type, work understanding of the work type, and management experience of the work type among the subcontractor, when we manage based on mutual personality which is the personality of interpersonal relationship that can communicate with each other by work type, process and grouping, it is concluded that effective and practical safety management can be achieved to reduce the accident rate and loss cost.

• KIEAE Journal
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• 제11권2호
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• pp.75-82
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• 2011

In Korea, the ratio of population in urban areas used to be only 50.1% in 1970, but with the value risen to 90.8% in 2009, urbanization is going on rapidly. Urbanization, which occurs by the rampantly planted buildings, has become major source of raising building density, changing wind direction and reducing wind amount, and such reductions are affecting even inside the building. In each year, among the total energy consumption in Korea, residential portion takes up significant ratio, and specifically the ratio of apartment house is shown to be highest. In order to solve such problem, many studies are being conducted for the improvement of natural ventilation performance. The natural ventilation performance of apartment house are significantly determined by the characteristics of external and internal structure, but in macroscopic perspective, the performance is established fundamentally by the layout characteristics of the main building of the apartment house in preparation for wind conditions. So far researches on raising the thermal comfort through elevation of ventilation performance have been conducted actively, but many of them propose only theoretical concepts deduced through wind path analysis, and do not include any indicator to measure ventilation performance simply only with area data from layout planning stage. Therefore, in this study, gap ratio a wind field measuring indicator was developed, and after the ventilation characteristics by layout types and main building uniformity were identified, the scope of gap ratio efficient for ventilation and that of uniformity were clarified, followed by verification through simulation.

• 한국산학기술학회논문지
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• 제20권6호
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• pp.579-586
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• 2019

본 연구는 경상북도 홈페이지에서 공개하고 있는 한옥표준설계도 4개 타입 32개 종류의 평면도를 대상으로 하였다. 연구목표는 한옥표준설계도의 타입별 특성을 비교분석하여 한옥을 설계하고자 하는 이용자에게 알림으로써 이용자의 만족도를 높이고자 하였다. 연구결과는 다음과 같다. 1. 한옥표준설계도에 현대주택에서 사용하는 현관과 같은 건축구성요소를 포함시켜 현대인의 삶을 수용하려고 노력하였다. 2. 농촌의 다양한 대지조건에도 불구하고 한옥표준설계도에서도 거실과 현관을 남쪽으로 배치하는 것을 선호하였고, 추후 확장을 위한 여분의 공간도 있었다. 3.침실개수는 2개 또는 3개가 가장 많았고 이에 침실의 개수 추가 및 농촌의 다양한 기능을 담을 수 있는 다양한 공간 확보가 필요할 것으로 조사되었다. 4. 공간구문론과 감마맵을 이용한 공간깊이 분석에서 안방의 공간 깊이는 툇마루에서 진입하는 동선보다 현관에서 진입하는 동선이 공간의 깊이가 깊은 것으로 분석되었다. 이는 안방의 공간 깊이는 개인의 프라이버시와 관련되는 만큼 충분한 공간깊이로 확보될 수 있도록 계획하여야 할 것으로 판단된다.

• 대한건축학회논문집:계획계
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• 제34권11호
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• pp.75-84
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• 2018

This study analyzed users' acceptance and intention to use in addition to needs and preferences of smart home technologies, and identified the differences in technology preference and acceptance by different factors. The subjects were residents in the 40s and 60s residing in the Seoul or suburbs of Seoul, and questionnaires were conducted in the 40s while interviews with questionnaires were conducted in the 60s. A total of 105 questionnaires were used as data, and frequency, mean, crossover, independent sample t test, one-way ANOVA and multiple regression analysis were performaed using SPSS23. The results of this study are as follows. First, hypertension, hyperlipidemia and hypercholesterolemia were the most common diseases among respondents and if there was no discomfort, they would like to continue living in the homes of the current residence. Therefore, the direction of smart home development should support the daily living and health care so that residents can live a healthy life for a long time in their living space. Second, the technologies that residents most need were a control technology of residential environments and a monitoring technology of residents' health and physiological changes. The most preferred sensor types are motion sensors and speech recognition while video cameras have a very low preference. Third, technology anxiety was the most significant factor influencing intention to accept smart home technology. The greater the technology anxiety is, the weaker the acceptance of technology. Fourth, when applying smart residential technology in homes, various resident characteristics should be considered. Age and technology intimacy were the most influential variables, and accordingly there were differences in technology preference and acceptance. Therefore, a user-friendly smart home plan should be done in the consideration of the results.

• 전기학회논문지P
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• 제67권2호
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• pp.63-69
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• 2018

In this paper, the operation principle of a bi-directional switch type resonant AC link snubber circuit was described, together with the practical design procedure, which employs in the proposed power module bridge package type resonant AC link snubber. The novel prototype of power module bridge package type resonant AC link snubber-assisted voltage type sinewave soft switching PWM inverter using IGBT power module was demonstrated herein. It was verified that both the auxiliary power switches in this resonant AC link snubber circuit and the main power switches commutate under the condition of soft switching commutation principle. In addition, the power losses of the new soft switching inverter treated here were analyzed by implementing the experimental data of the IGBT and diode v-i characteristics in addition to switching power loss characteristics into our original computer simulation software developed by the authors. Then, the voltage type sinewave soft switching PWM inverter was high efficiency than that of hard switching PWM inverter, along with performance operation waveforms. In the future, the comparative feasibility study of power module bridge type resonant AC link snubber and its related soft switching inverter in addition to the other types resonant snubber assisted soft switching inverter should be done from a practical point of view.

• 한국융합학회논문지
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• 제8권6호
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• pp.227-235
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• 2017

건축의 본질은 건축가의 설계행위에 대한 결과로서 획득되는 공간이지만, 정작 설계의 대상은 공간이 아니라 그것을 구축하기 위한 물리적 요소들이다. 근대건축의 거장들이 이 요소들로 구성이 가능한 공간의 유형들은 기술하였지만, 그 구성방법에 대해서는 언급하지 않았다는데 공간구축의 어려움이 존재한다. 이러한 관점에서 건축이 인간 행위를 담는 기술이며 공간을 구축하는 예술이라면, 그 실체가 모호한 공간을 구축하는 방법에 대한 구체적인 연구의 필요성이 인식된다. 그러므로 Neo Corbusian의 대표적인 건축가인 Henri Ciriani의 '4 Logements Studio'를 통하여 사선적인 공간의 확장성에 대한 연구를 진행하였다. 공간의 확장성을 구현하는 방법으로는 시리아니가 제시한 '일체화를 위한 네트워크'방법에 대하여 고찰하였으며, 가구는 건축공간읽기의 요소로 디자인되어야 하는 점과 등가성 채광 조망 공동체의 삶을 기준으로 4개의 주거배치에 대한 3개의 최적 대안을 도출하였다.

• 한국산학기술학회논문지
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• 제8권4호
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• pp.832-841
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• 2007

현대인의 다양한 삶, 다원화된 욕구, 개성적인 삶의 추구 등은 주택수요의 다원화로 나타나고 주택 수요자의 소득 및 생활수준의 향상, 소비 행태의 고급화와 새로운 주거공간에의 요구 등은 과거와 같은 표준적인 평면형으로부터 보다 개성적이고 다양한 주거공간에 대한 창출을 요구하고 있다. 본 연구는 이러한 다원화 개성화된 주택 수요자층에 대한 인식을 배경으로 여유있는 생활을 위하여 부가된 여분의 공간임과 동시에 다른 집과 차별화되고 자신만의 개성 창출이 가능한 공간으로서 수요자의 개별적 요구에 대응할 수 있는 여유실(여유공간)을 확보할 수 있는 계획 기법을 다양한 사례 조사를 통해 분석 정리하는 것을 목적으로 하였다. 연구 결과 여유실 확보 계획 기법으로는 1)거실-침실 부분 평면선택의 활용, 2)부부 전용공간 평면선택형의 활용, 3)전이공간의 삽입과 여분 공간의 활용, 4)주방과 인접한 주부 전용공간의 삽입, 5)발코니 공간의 적극적 활용 등으로 분석되었다. 본 연구는 이러한 계획 기법을 다양한 사례를 통해 제시해 주는 것에도 주력하고자 하였다.

• 대한조선학회논문집
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• 제43권4호
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• pp.512-520
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• 2006

The effects of flexibilities of supporting structures on shaft alignment are growing as ship sizes are Increasing mainly for container carrier and LNG carrier. But, most of classification societies not only do not suggest any quantitative guidelines about the flexibilities but also do not have shaft alignment design program considering the flexibility of supporting structures. A newly developed program, which is based on innovative shaft alignment technologies including nonlinear elastic multi-support bearing concept and hull deflection database approach, has S basic modules : 1)fully automated finite element generation module, 2) hull deflection database and it's mapping module on bearings, 3) squeezing and oil film pressure calculation module, 4) optimization module and 5) gap & sag calculation module. First module can generate finite element model including shafts, bearings, bearing seats, hull and engine housing without any misalignment of nodes. Hull deflection database module has built-in absolute deflection data for various ship types, sizes and loading conditions and imposes the transformed relative deflection data on shafting system. The squeezing of lining material and oil film pressures, which are relatively solved by Hertz contact theory and built-in hydrodynamic engine, can be calculated and visualized by pressure calculation module. One of the most representative capabilities is an optimization module based on both DOE and Hooke-Jeeves algorithm.