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원자로 입출구 노즐 이종금속 용접부 Weld Inlay 레이저 클래딩 공정 개발
조홍석,정광운,모민환,조기현,최동철,이장욱,조상범,Cho, Hong Seok,Jung, Kwang Woon,Mo, Min Hwan,Cho, Ki Hyun,Choi, Dong Chul,Lee, Jang Wook,Cho, Sang Beum 한국압력기기공학회 2015 한국압력기기공학회 논문집 Vol.11 No.1
This study was investigated to develop process technology of laser cladding with austenite stainless steel for Weld Inlay repair of dissimilar metal weld in reactor vessel in/outlet nozzles. Weld Inlay experiments were performed by laser cladding repair system consisting of common manipulator, laser apparatus and welding process scheduler, etc. Single pass welding experiments were conducted in order to obtain the optimum welding process parameters for filler wires of ER309L and Alloy 52M before multi-layer laser cladding. Based on the above obtained results, multi-layer laser cladding experiments were carried out, and welding qualities for weld specimens were estimated by PT, OM, SEM and EDS analysis. Consequently, it was revealed that multi-layer laser cladding on austenite stainless steel using filler wires of ER309L and Alloy 52M could be possible to meet ASME Code standard without any weld defect.
조홍범 ( Hong Bum Cho ),정순오 ( Soon Oh Jeung ),최용근 ( Yong Gun Choi ) 한국환경생물학회 2004 환경생물 : 환경생물학회지 Vol.22 No.1
동굴 내 정점별 세균 군집 구조를 분석하기 위하여 PCR amplified 16S rDNA denaturing gradient gel electrophoresis (DGGE)를 적용하였다. DGGE는 동일한 분자량을 갖는 dsDNA band라고 할지라도, 각각의 염기서열 차이에 따라 전기영동 상에서 고유한 band 양상을 나타낼 수 있다. eubacteria의 16S rDNA V3 region을 증폭하기 위해 GC341F와 PRUN518r을 primer로 사용하여 지하수내에 미생물 군집의 다양성과 유사성을 분석하였다. DGGE band양상을 통해 동굴내의 세균 군집 구조는 외부 환경에 비해 상대적으로 종다양성이 낮으며 동굴내에서 특이적으로 서식하는 종이 있음을 확인하였다. 또한 유기 영양물질의 공급이 제한되어 있는 동굴에서 구아노가 주요 유기 영양물질의 공급원으로서 큰 영향을 미치고 있는 것으로 파악되었다. DGGE상의 일부 band의 염기서열분석 결과 Pseudomonas sp. NZ060과 Pseudomonas pseudoalcaligenes, uncultured Variouorax sp,. soil bacterium NS7로 동정되었다. The bacterial community of water stream, soil and guano in Gossi cave was examined by using PCR amplified the 16S rDNA-denaturing gradient gel electrophoresis (DGGE). In this study, the genetic diversity and the similarity of bacterial community between open area and non-open area for cave tour were investigated, and the seasonable variation pattern was compared each other. DGGE is attractive technique, as it separate same length dsDNA according to sequence variation typical 16S rDNA genes. The diversity and similarity of bacterial community in cave was analyzed by GC341f and PRUN518r primer sets for amplification of V3 region of eubacteria 16S rDNA. The specific DGGE band profile of the cave water gives the possibility that the specific bacterial cell can be adapting to the specific cave environment and living in the cave. The DGGE band profiles of all samples with guano were compared and analyzed by image analyzer, in which mutual band profile was compared to be and the band intensity of guano was the highest. From these result, it is thought that the guano was main nutrient source and influenced on the community structure of the cave environment where is nutritionally limited. Pseudomonas sp. NZ060, Pseudomonas pseudoalcaligenes, uncultured Variovorax sp. and soli bacterium NS7 were identified to be on some sample from analysing DNA sequence of some DGGE band.
조홍범(Cho Hongbum),윤상천(Yoon Sangchun),지남용(Jee NamYong) 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.4
There are only a few tests to ensure concrete quality before placing in domestic construction site; One is the slump test for workability, the others are the air content test and the chloride content test for durability. The concrete compressive strength which is the one of important factors to influence on concrete quality was tested after 28 days when placed. Methods for early estimation of concrete strength have been introduced for concrete quality control, but such methods are expensive, and required experienced skill and time. Therefore, these have difficulties in situ application for concrete quality control. The subject of this study is the result of 1442 compressive strength tests on 59 different kinds of mix design with specified compressive strength of 180∼270kgf/㎠, water-cement ratio of 0.39∼0.62, Gmax 25㎜, and slump of 12∼15㎝. This study aimed at reviewing application of prediction equation of compressive strength as a means of strength control of ready-mixed concrete, making an regression equation which enables to estimate compressive strength at 28 days by multiple linear regression analysis on the basis of mix proportion of ready-mixed concrete and compressive strength testresults of construction site.
조홍범 ( Hong Beom Cho ),조우석 ( Woo Sug Cho ),박준구 ( Jun Ku Park ),송낙현 ( Nak Hyun Song ) 大韓遠隔探査學會 2008 大韓遠隔探査學會誌 Vol.24 No.2
건물의 3차원 모델링은 3차원 공간정보를 구축하는데 있어서 매우 중요한 요소이다. 기존의 3차원 건물 모델링은 대부분 항공사진측량기술을 이용하여 수동으로 진행되어 많은 시간과 비용이 소요된다. 이러한 한계를 극복하기 위한 방안으로 최근에는 항공라이다(LiDAR) 데이터를 이용한 건물모델링 방법에 대한 많은 연구가 활발히 진행되고 있다. 항공라이다 데이터를 이용한 대부분의 3차원 건물모델링 연구는 보간과정을 통하여 격자구조로 변환하거나 수치지도 또는 항공영상 등의 이종 데이터간의 융합을 통하여 건물을 모델링하는 방안 등을 제시하였다. 본 논문에서는 점 데이터의 격자구조로의 변환 및 이종 데이터간의 융합 등의 방법을 배제하고 항공라이다 데이터만을 이용한 건물의 자동 모델링 방법을 제안하였다. 건물로 분류된 항공라이다 데이터를 옥트리 분할을 기반으로 3차원 공간상에서 재귀적으로 분할하여 패치(patch)를 구성하고, 동일한 속성을 갖는 패치들을 병합하여 건물의 구성요소를 추출한다. 추출되어진 건물의 구성요소를 대표하는 모델을 생성하여 전체적인 건물의 3차원 모델을 구성한다. 항공라이다 데이터를 이용하여 제안된 방법으로 실험한 결과, 다양한 형태의 건물 모델을 자동으로 구성할 수 있었다. The 3D building modeling is one of crucial components in constructing 3D geospatial information. The existing methods for 3D building modeling depend mainly on manual photogrammetric processes, which indeed take great amount of time and efforts. In recent years, many researches on 3D building modeling using aerial LiDAR data have been actively performed to aim at overcoming the limitations of existing 3D building modeling methods. Either techniques with interpolated grid data or data fusion with digital map and images have been investigated in most of existing researches on 3D building modeling with aerial LiDAR data. The paper proposed a method of 3D building modeling with LiDAR data only. Firstly, octree-based segmentation is applied recursively to LiDAR data classified as buildings in 3D space until there are no more LiDAR points to be segmented. Once octree-based segmentation is completed, each segmented patch is thereafter merged together based on its geometric spatial characteristics. Secondly, building model components are created with merged patches. Finally, a 3D building model is generated and composed with building model components. The experimental results with real LiDAR data showed that the proposed method was capable of modeling various types of 3D buildings.