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박상근,Park, Sangkun 한국교통대학교 융복합기술연구소 2020 융ㆍ복합기술연구소 논문집 Vol.10 No.1
We describe a efficient surface reconstruction method that reconstructs a 3D manifold polygonal mesh approximately passing through a set of 3D oriented points. Our algorithm includes 3D convex hull, octree data structure, signed distance function (SDF), and marching cubes. The 3D convex hull provides us with a fast computation of SDF, octree structure allows us to compute a minimal distance for SDF, and marching cubes lead to iso-surface generation with SDF. Our approach gives us flexibility in the choice of the resolution of the reconstructed surface, and it also enables to use on low-level PCs with minimal peak memory usage. Experimenting with publicly available scan data shows that we can reconstruct a polygonal mesh from point cloud of sizes varying from 10,000 ~ 1,000,000 in about 1~60 seconds.
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박상근,이상진,강훈 사단법인 인문사회과학기술융합학회 2019 예술인문사회융합멀티미디어논문지 Vol.9 No.7
Asan-si Onyang 1-dong Rose Village was the center of abuse culture such as adult sex trafficking, juvenile drinking and smoking. At present, unstructured culture has been reduced due to intensive patrols. However, due to business interruption, signboards and outer walls have been left in the form of prostitution shops in the past, and old buildings are hanging down. It is also a culturally and socially isolated area. In order to improve these aging regions, the first thing we need is a relationship sharing through local communication. Therefore, it is necessary to apply the concept of Metaphor and Metonymy, which is one of the methods of relationship sharing. Metonymy Metaphor 'and' Metonymic Metaphor ', which is an element of Metonymy. In other words, by using the accessibility of Metropolitan Metaphor and the accessibility of the rose town, it creates the educational space for adolescents, the space for entrepreneurship experience, and the cultural life space of local residents. We want to form relationship sharing through knowledge exchange and communication between youth and old people. It will be a strategic plan of regional revitalization to meet the requirements of each age group and to have unity and familiarity of architecture and people together. 아산시 온양 1동 장미마을은 과거 성인들의 성매매, 청소년들의 음주, 흡연 등의 불건전 문화의 중심지였다. 현재에 들어 집중 순찰로 불건전 문화는 줄었지만 영업중지로 인하여 간판과 외벽들이 과거 성매매 업소의 형태 그대로 방치되고 노후화된 건물들이 늘어져 있는 상황으로 문화적, 사회적으로 소외된 지역이기도 하다. 이러한 노후화된 지역을 개선하기 위해서 우선적으로 필요한 것은 지역적인 소통을 통한 관계맺기라 하겠다. 따라서 관계맺기를 위해서 주변의 시설물과 지역적인 특성에 대하여 살펴보고 관계맺기의 한 방법인 은유와 환유의 개념을 적용시키고자 한다. 환유의 형태이면서 은유의 요소가 들어가 있는 ‘환유적 은유’라는 건축언어를 적용시켜 침체된 지역을 대상으로 관계맺기를 통한 지역 재활성화를 시도한다. 즉 장미마을 대상지의 접근성과 환유적 은유를 활용하여 청소년의 교육공간과 창업 체험공간, 지역 주민들의 문화생활 공간을 생성시키고 청소년과 노년층의 지식 교류와 소통을 통한 관계맺기를 형성시키고자 한다. 이렇듯 각 연령층들의 필요 요건들을 충족시키며 건축과 사람의 낯설게 하기와 친숙함을 아울러 가질 수 있도록 하는 것이 지역 재활성화를 위한 하나의 전략적 방안이 될 것으로 기대한다.
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Feedforward와 Defected Ground Structure를 이용한 주파수 체배기 설계
박상근,임종식,정용채,김철동,Park Sang-Keun,Lim Jong-Sik,Jeong Yong-Chae,Kim Chul-Dong 한국전자파학회 2006 한국전자파학회논문지 Vol.17 No.8
Feedforward와 defected ground structure(DGS)를 이용한 새로운 주파수 체배기를 제안하였다. 제한된 주파수 체배기는 feedforward 구조에 의해 기본 주파수$(f_0)$가 제거되고, 아령 또는 나선형 모양의 DGS 구조에 의해 2차, 3차 또는 4차의 원하지 않는 고조파 성분들을 제거할 수 있었다. 결국 feedforward와 DGS 구조에 의해서 체배하고자 하는 성분을 제외한 나머지 고조파들이 제거되었다. 기본 주파수를 1 GHz로 하여 주파수 체배기를 설계하고, 측정하였다. 입력 전력을 0dBm으로 하였을 때 2체배기, 3체배기와 4체배기의 출력 전력은 각각 -2.59 dBm, -5.36 dBm과 -4.57 dBm이었다. A novel design of frequency multiplier using a feedforward technique and a defected ground structure(DGS) is proposed. The feedforward loop in the proposed frequency multiplier suppresses the fundamental component $(f_0)$, the dumb-bell or spiral shaped DGS diminish unwanted harmonics such as second, third and fourth. Due to the combination of the feedforward structure and the DGS, only the multiplied frequency component$(2f_0,\;3f_0,\;4f_0)$ appears at the output port and the other unwanted components are suppressed excellently. The frequency multiplier is designed at 1 GHz $(f_0)$, by the proposed technique and measured. The measured output power of $2f_0,\;3f_0$ and $4f_0$ is -2.59 dBm, -5.36dBm and -4.57dBm, respectively, when the input power is 0dBm.
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박상근,이건우,Park, Sang-Geun,Lee, Geon-U 대한기계학회 1997 大韓機械學會論文集B Vol.21 No.8
The past several years have witnessed an ever-increasing acceptance and adoption of parallel processing, both for high performance scientific computing as well as for more general purpose applications. Furthermore with increasing needs to perform the complex flow calculations in an efficient manner, the use of the message passing model on distributed networks has emerged as an important alternative to the expensive supercomputers. This work attempts to provide a generic framework to enable the parallelization of all CFD-related works using the master-slave model. This framework consists of (1) input geometry, (2) domain decomposition, (3) grid generation, (4) flow computations, (5) flow visualization, and (6) output display as the sequential components, but performs computations for (2) to (5) in parallel on the workstation clustering. The flow computations are parallized by having multiple copies of the flow-code to solve a PDE on different spatial regions on different processors, while their flow data are exchanged across the region boundaries, and the solution is time-stepped. The Parallel Virtual Machine (PVM) is used for distributed communication in this work.
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수리 가능한 체계에 대한 Upside-Down 욕조 곡선 형태의 삼분할된 고장 강도 모형
박상근,김상부,박우재 한국신뢰성학회 2022 신뢰성응용연구 Vol.22 No.4
Purpose: This study proposes an upside-down bathtub-shaped three-segmented failure intensity model for repairable systems. The procedure for estimating the parameters for the proposed model is presented under certain assumptions regarding the change points of the model. Methods: The proposed model comprises three failure intensity functions - one for each of the three model segments. The model is therefore a P-H-P model, with the power law process model, the homogeneous Poisson process model, and the power law process model that follows the non-homogeneous Poisson process as the failure intensity functions. The change points and the parameters of each failure intensity function were determined using maximum likelihood estimation and least squares estimation. Results: The case study shows that compared with other extant models, the proposed P-H-P model is more suitable in terms of log-likelihood function value, Akaike information criterion corrected, and mean squared error. Conclusion: The proposed P-H-P model is expected to better explain the failure intensities of similar systems and to allow for more accurate reliability analysis.
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