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[논문]용접부의 피로 파손모드 평가에 대한 구조응력기법의 적용에 관한 연구
강성원,김명현,김정환 釜山大學校生産技術硏究所 2006 生産技術硏究所論文集 Vol.65 No.-
반복 하중을 받게 되는 하중전달형의 필릿 용접이음에서는 용접 토우부 뿐만 아니라 용입 부족부 선단에서도 응력집중을 일으키고 피로균열이 발생/ 전파하는 경우가 있다. 특히/ 용접 루트부에서 발생한 균열은 육안관찰이 불가능하고 초음파 탐상등에 의한 비파괴 검사에 의해서도 검출이 곤란한 경우가 많다. 이것은 중대한 손상을 일으키기 까지 방치되는 경우가 많기 때문에 용접 루트부에서 발생하는 균열에 대한 연구는 현재 활발히 진행되고 있다. 본 연구에서는 최근 유한요소 해석시 요소의 크기에 둔감하다고 알려진 구조응력 기법을 이용하여 용입 부족부를 가지는 하중전달형 필릿 용접부의 피로 파손모드를 평가하였다. 용접부 다리길이의 변화에 따른 사례 연구를 통하여 용접 루트부의 파손을 피할 수 있는 용접부 시공기준에 관한 연구를 수행하였으며 이에 대한 구조응력 기법의 적용 가능성을 검토하였다.
현인환,민진호,이상목,이제인 대한상하수도학회 2003 상하수도학회지 Vol.17 No.6
This study is to evaluate the existing methods to determine the design capacity of the multi-branched water transmission systems. Three types of methods are generally used to determine the design capacity of water transmission systems. The first method is that total average day demand and peak factor of whole area is considered to estimate total maximum day demand, and then it is assigned to each pipe in the system. The second method is that total demand for each pipe in the system is calculated by adding up maximum day demand of each area. Because the calculation of design flow for each pipe is simple and convenient, this method is generally used for the design currently. The third method is that the each proper peak factor for each pipe in the system are estimated to predict maximum day demand of each pipe. In this study, two real water transmission systems were considered as study areas, and three methods were applied. The first method tends to underestimates the design capacities especially for branch pipes. On the other hand, the second method tends to overestimates the design capacities for most pipes. As a result, it is found that the third method generates most reasonable design capacities for each pipe. However, mass balance for the analysis of water transmission systems can not be satisfied automatically in the third method. Therefor, dummy nodal flows method are suggested to satisfy the Mass Balance Equations in this study.
현인환,이상목,김영환,전경호 대한상하수도학회 2002 상하수도학회지 Vol.16 No.5
In this study, the errors caused by improper application of equivalent pipe method on analysis of network were investigated. Especially, the errors related to selection of C-coefficients, pipe lengths, pipe diameters and flow rates were focused. To reduce errors caused by applying equivalent pipe method in network analysis, both C-coefficient of each parallel pipe and large flow rate variation in the parallel pipes between connected junctions should be considered. Results of this study are as follows. When the different C-coefficients of each parallel pipe was not considered, the application of equivalent pipe method caused 47.84% error in headloss and 24.75% error in pipe flow in model network. Also, When large flow rate variation existed in the parallel pipes between connected junctions, equivalent pipe method caused 51.61% error in headloss.
배수관망내 수압부족시 절점수요량의 변화에 대한 기초적 고찰
현인환,이상목,김영환,안용호 대한상하수도학회 2002 상하수도학회지 Vol.16 No.6
Pressure drop could happen in the water distribution systems due to pipe breaks or maintenance. The pressure drop causes the water service shutdown and nodal water demands should be reduced in some areas. The conventional analysis method of water distribution systems can not consider the change of nodal water demands caused by these pressure drops. This study is to investigate the variation of nodal water demands according to the nodal water pressure and its effect on the analysis of water distribution systems. For these purpose, one real water service district was selected as a study area. As a result, nodal water demand patterns according to the water pressure could be suggested. Also, we could confirm that the suggested new analysis method for the water distribution systems which considering water pressure drops could be more reliable than the conventional method.
의정부시의 도시경관 기초자료 도출을 위한 주민의식 조사
서주환,최현상,승지현,박대우 경희대학교 디자인연구원 2004 예술· 디자인학연구 Vol.7 No.1
As various values become respected with changing paradigm. Our modern cities are characterized by indetermination ever. Change of life style make people concerned more about city environment. Our contemporary society has gradually respected and sportlighted the importance of human being as principal, and conventional awareness about urban environment has been changing owing to higher interest in 'a life quality in the city' than ever, We have beer preferred an urban environment planning to make city more sustainable and agreeable scape. But nowaday, resident's demands actively reflect on city planning them ever to make satisfaction in city life. This study aims to investigate positive landscape factors and create urban image-map in order to find out instinctive data use on urban environment planning. It can be introduce sustainable and agreeable city scape in Uijung-Bu.
지능형 내시경용 초소형 형상기억합금 엑츄에이터의 제작 및 특성에 관한 연구
김민성,박두환,박현철,이준탁 동아대학교 정보기술연구소 2001 情報通信硏究所論文誌 Vol.9 No.1
A SMA actuator fabricated in this paper generates the large force and it's structure is very simple. The SMA actuator was fabricated by small size with diameter of 9mm and length of 27mm and also it's actuations toward all the directions can be acquired because of three springs which was fabricated with diameter of 2.4mm and 28 turns. We showed into applicability to smart catheter by analysing accurately the dynamic characteristics such as heading angle, force, displacement.
김성우,최우창,류지열,박성현,최혁환,이명교,권태하 경북대학교 센서기술연구소 1997 센서技術學術大會論文集 Vol.8 No.1
The DMA(Dimethylamine) gas sensors were fabricated with the ZnO-based thin films grown by a RF magnetron sputtering method. We investigated the sensitivity and response time according to temperature variation and DMA gas concentration. The ZnO-based thin film sensors sputtered in oxygen atmosphere showed higher sensitivity than those sputtered in argon atmosphere. The ZnO-based thin film sensors doped with Al_(2)O_(3), In_(2)O_(3) and V_(2)O_(5) and sputtered in oxygen atmosphere showed the maximum sensitivity of 218(working temperature, 250 ℃, DMA gas, 160 ppm) and speedy response time. The ZnO-based thin film sensors doped with Al_(2)O_(3), In_(2)O_(3), TiO_(2) and V_(2)O_(5), sputtered in oxygen atmosphere and aged at 330 ℃ showed the maximum sensitivity of 156(working temperature, 250 ℃, DMA gas, 160 ppm).