http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Changwan Son,Byungchae Kim,Jaehyuk Shin,Dagli, N. IEEE 2011 Journal of lightwave technology Vol.29 No.19
<P>Metal slab waveguide reflectors integrated with very compact high index contrast waveguides are described, designed and simulated. Reflection and transmission characteristics of such reflectors are studied using 2-D and 3-D finite different time domain (FDTD) simulations. It is shown that the reflection and transmission coefficients can be controlled by adjusting the gap and length of metals of the reflector. Reflection coefficients much higher than cleaved facets and even higher than metal coated facets are possible. Reflection coefficients of almost 97% are achievable using only 1 μm long reflectors. The sensitivity of obtained reflection as a function of alignment errors indicates that more than 90% reflectivity is possible with 0.1 μm alignment tolerance. It is also shown that very compact Fabry-Perot resonators with FSR of 67.1 nm are possible using such reflectors. These resonators are directly coupled to input and output waveguides and have 5 μ m active length and less than 7 μm overall length including mirrors.</P>
경량화 가능한 C/Pad 코어용 고강성/고충격 PP 복합재 개발
손창완(Changwan Son),김현돈(Hyundon Kim),전용(Yong Chun),오민근(Mingeun Oh),서하규(Hakyu Seo),이명렬(Myungryeol Lee) 한국자동차공학회 2013 한국자동차공학회 학술대회 및 전시회 Vol.2013 No.11
To increasing fuel efficiency, every car maker research and develop parts more lightlyt. For weight reduction of part, we need not only thinner wall design, but also development of high modulus plastic material. This study is about design and material optimization, to apply low density polypropylene filled long glass fiber and rubber for IP structure. We developed 2.8kg IP structure with 20wt% long glass fiber filled high impact and modulus polypropylene and thin wall designed of 1.8~2.5mm.
손창완(Changwan Son),김현돈(Hyundon Kim),김범호(Beomho Kim),박준현(Junhyun Park) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Passenger Airbag is one of the important part in instrument panel that is satisfied airbag deployment requirement. Recently, the most of automotive interior parts selects invisible airbag system. So, they use various scoring methods. Especially, laser scoring method is making a continuous hole using laser beam. This method is influenced sensitively by transmittance and absorption of materials. In this study, to find a correlation between component of polymer and laser scoring influence factor. Especially, general purpose used polypropylene filled talc, thermoplastic polyolefin that how to influenced by content of component for laser scoring.
Son, Hyojoo,Kim, Changmin,Kim, Changwan American Society of Civil Engineers 2015 Journal of computing in civil engineering Vol.29 No.4
<P> There has been a growing demand for the three-dimensional (3D) reconstruction of as-built pipelines. The as-built 3D pipeline reconstruction process consists of the measurement of an industrial plant, identification of pipelines, and generation of 3D models of the pipelines. Although measurement is now efficiently performed using laser-scanning technology, and in spite of significant progress in 3D pipeline model generation, the identification of pipelines from large and complex sets of laser-scanned data continues to pose a challenge. The aim of this study is to propose a method to automatically extract 3D points corresponding to as-built pipelines that occupy large areas of industrial plants from laser-scanned data. The proposed extraction method consists of the following steps: preprocessing, segmentation of the 3D point cloud, feature extraction based on curvature computation, and pipeline classification. An experiment was performed at an operating industrial plant to validate the proposed method. The experimental result revealed that the proposed method can indeed contribute to the automation of as-built 3D pipeline reconstruction. </P>
Son, Hyojoo,Kim, Changwan Elsevier Science B.V., Amsterdam. 2017 ADVANCED ENGINEERING INFORMATICS Vol.34 No.-
<P><B>Abstract</B></P> <P>The aim of this study is to propose a method for generating as-built BIMs from laser-scan data obtained during the construction phase, particularly during ongoing structural works. The proposed method consists of three steps: region-of-interest detection to distinguish the 3D points that are part of the structural elements to be modeled, scene segmentation to partition the 3D points into meaningful parts comprising different types of elements (e.g., floors, columns, walls, girders, beams, and slabs) using local concave and convex properties between structural elements, and volumetric representation. The proposed method was tested in field experiments by acquiring and processing laser-scan data from construction sites. The performance of the proposed method was evaluated by quantitatively measuring how accurately each of the structural elements was recognized as its functional semantics. Overall, 139 elements of the 141 structural elements (99%) in the two construction sites combined were recognized and modeled according to their actual functional semantics. As the experimental results imply, the proposed method can be used for as-built BIMs without any prior information from as-planned models.</P> <P><B>Highlights</B></P> <P> <UL> <LI> This study proposed a method for semantic as-built modeling of structural elements. </LI> <LI> The method uses local concave and convex properties between structural elements. </LI> <LI> Performance was evaluated using laser-scan data acquired from the construction sites. </LI> <LI> 3D point cloud was segmented into parts belonging to their own functional semantics. </LI> <LI> The method has ability to generate volumetric-semantic models of as-built structures. </LI> </UL> </P>