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박중구(JungGoo Park),김기태(KiTae Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
The effect of the metal mold on densification behavior of stainless steel 316L powder was investigated<br/> under warm isostatic pressing with metal mold. We use lead as metal mold and obtain experimental data of<br/> metal mold property. To simulate densification of metal powder, the elastoplastic constitutive equation<br/> proposed by Shima and Oyane was implemented into a finite element program (ABAQUS) under warm die<br/> pressing and warm isostatic pressing with metal mold. Finite element results were compared with<br/> experimental data for densification and deformation of metal powder under warm isostatic pressing and warm<br/> die pressing.
3차원 지반모델링 기반의 지반함몰 위험 지반 레이어 개발 방법
강정구(Junggoo Kang),강재모(Jaemo Kang),박준환(Junhwan Parh),문두환(Duhwan Mun) 한국지반환경공학회 2021 한국지반환경공학회논문집 Vol.22 No.12
도심지에서 빈번하게 발생하는 지반함몰 사고는 지하시설물의 노후화, 지하개발 활동에 따른 지반의 교란과 지하수 변화 등 다양한 원인에 의해 발생하고 있다. 지반함몰 위험을 사전 예측하기 위해서는 지반함몰 사고에 영향을 미치는 인자들에 대한 지반 공학적 및 수리학적 검토가 필요하다. 따라서 본 연구에서는 현재 운영되고 있는 지반조사 데이터 및 지하수위 변동 정보를 이용하여 지반함몰이 발생한 연구대상 지역의 3차원 지반모델링 및 월별 지하수위에 대한 자료 분석을 수행하였으며, 이를 활용해 실제 지반함몰 발생 이력과 지반조건 및 지하수위 변화와의 관계성을 확인하였다. 또한, 기존 시추정보에서 통일 분류 체계(USCS)에 따라 제시된 흙의 공학적 특성을 지반함몰과 연관된 공학적 지표인 흙의 내부 침식 민감도로 재구성하여 지반함몰 위험도를 가시화하는데 활용하는 방법론을 제시하였다. 연구결과, 지반함몰 발생 지역의 지반은 내부 침식이 취약한 모래(SM, SC, SP, SW)가 40% 이상 구성되어 있음을 확인했으며, 지하수위 변화에 따른 지반함몰 발생빈도와의 관계성도 확인할 수 있었다. The deterioration of underground facilities, disturbance of the ground due to underground development activities, and changes in ground water can cause ground subsidence accidents in the urban areas. The investigation on the geotechnical and hydraulic factors affecting the ground subsidence accident is very significant to predict the ground subsidence risk in advance. In this study, an analysis DB was constructed through 3D ground modeling to utilize the currently operating geotechnical survey information DB and ground water behavior information for risk prediction. Additionally, using these results, the relationship between the actual ground subsidence occurrence history and ground conditions and ground water level changes was confirmed. Furthermore, the methodology used to visualize the risk of ground subsidence was presented by reconstructing the engineering characteristics of the soil presented according to the Unified Soil Classification System (USCS) in the existing geotechnical survey information into the internal erosion sensitivity of the soil, Based on the result, it was confirmed that the ground in the area where the ground subsidence occurred consists of more than 40% of sand (SM, SC, SP, SW) vulnerable to internal erosion. In addition, the effect of the occurrence frequency of ground subsidence due to the change in ground water level is also confirmed.
조정구(Junggoo Cho) 한국예술종합학교 미술원 조형연구소 2006 Visual Vol.3 No.-
While I took a survey of the old center of Seoul: Jong-ro and Chung-gye-chun for the last few years, I realized that there is a inhabitant subject that live in the city. It adapts to the built-environment and sometimes, transforms itself, and reconstructs the built-environment in which it resides. This subject can be defined as ‘a unit of management that has a specific function and possesses space in the urban built-environment’, I named it “gigan”. Here, I intended to explain how I got to define “gigan”, the context of its definition and nature, and also show a wide variety of ways of its existence through examples. In the latter part, focusing on the relationship between “gigan” and the built environment, I tried to show the relationship between “gigan” and the general buildings, and the vitality of the buildings could be created by possession of “gigan”. And finally, in the “World without boundaries”, I tried to evaluate “gigan” as a medium that makes a unique environment in the city beyond the boundaries of possession or architectural types and also tried to reveal the value of the built environment that it reconstructs.
Lee, Junggoo,Lee, Joonho,Tanaka, Toshihiro,Mori, Hirotaro IOP Pub 2009 Nanotechnology Vol.20 No.47
<P>Phase stabilities of nanometer-sized materials are quite different from those of the corresponding bulk materials. Among the phase stabilities, melting point suppression is one of the most fundamentally important issues. In this work, real-time, atomic-scale direct observation of melting point suppression in nanometer-sized Au particles, along with simple size reduction, was carried out by means of <I>in situ</I> high resolution electron microscopy. Namely, it was confirmed in real space on an atomic scale that a solid-to-liquid transition occurred when the size of a particle, placed on a graphite substrate maintained at 1100 K, decreased to 5 nm during diminution. Furthermore, a monolayer-thick hole was formed on the substrate at the position of the liquid Au particle, probably due to carbon dissolution into the liquid Au particle.</P>
Urea-SCR 시스템 적용을 위한 스월 인젝터의 분무특성
홍정구(Junggoo Hong),구건우(Kunwoo Ku),김성열(Sungryoul Kim),이충원(Choongwon Lee),강명권(Myungkweon Kang),김경남(Kyungnam Kim),김재경(Jaekyoung Kim) 한국자동차공학회 2011 한국자동차공학회 지부 학술대회 논문집 Vol.2011 No.4
In this study, a swirl hollow cone injector, which has a good atomization performance at the low injection pressure relatively, was designed to apply the Urea-SCR. In order to investigate the spray pattern and SMD of a swirl injector, the spray visualization was conducted by using the simple swirl injector, and the images of the axial of stance from the nozzle exit. The shape of the spray was converted from the hollow cone to solid cone along the distance from the injector exit. The spray angle is increased and the SMD is decreased with increasing injection pressure respectively.
Urea-SCR 시스템 적용을 위한 스월 인젝터의 분무특성
홍정구(Junggoo Hong),구건우(Kunwoo Ku),김성열(Sungyoul Kim),이충원(Choongwon Lee),강명권(Myungkweon Kang),김경남(Kyungnam Kim),김재경(Jaekyoung Kim) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.4
??In this study, a swirl hollow cone injector, which has a good atomization performance at the low injection pressure relatively, was designed to apply the Urea-SCR. In order to investigate the spray pattern and SMD of a swirl injector, the spray visualization was conducted by using the simple swirl injector, and the images of the spray cross-section were obtained from a sheet beam of Nd-Yag laser and CCD camera. The SMD of the swirl injector was measured with the axial of stance from the nozzle exit. The shape of the spray was converted from the hollow cone to solid cone along the distance from the injector exit. The spray angle is increased and the SMD is decreased with increasing injection pressure respectively.