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Selection-based Low-cost Check Node Operation for Extended Min-Sum Algorithm
( Kyeongbin Park ),( Ki-seok Chung ) 한국인터넷정보학회 2021 KSII Transactions on Internet and Information Syst Vol.15 No.2
Although non-binary low-density parity-check (NB-LDPC) codes have better error-correction capability than that of binary LDPC codes, their decoding complexity is significantly higher. Therefore, it is crucial to reduce the decoding complexity of NB-LDPC while maintaining their error-correction capability to adopt them for various applications. The extended min-sum (EMS) algorithm is widely used for decoding NB-LDPC codes, and it reduces the complexity of check node (CN) operations via message truncation. Herein, we propose a low-cost CN processing method to reduce the complexity of CN operations, which take most of the decoding time. Unlike existing studies on low complexity CN operations, the proposed method employs quick selection algorithm, thereby reducing the hardware complexity and CN operation time. The experimental results show that the proposed selection-based CN operation is more than three times faster and achieves better error-correction performance than the conventional EMS algorithm.
EN 16019에 따른 유럽 표준형 연결기 헤드의 강도시험 연구
민경빈(Kyeongbin Min),박진규(Jinkyu Park),강지성(Jisung Kang),김경훈(Kyunghoon Kim),장홍석(Hongseok Jang),김기남(Kinam Kim) 한국철도학회 2017 한국철도학회 학술발표대회논문집 Vol.2017 No.05
철도부품을 개발하는데 있어서 기술기준 및 규격의 준수는 필수적인 요소가 되어가고 있다. 또한, 제품의 우수성을 입증하기 위해 인증 획득이 중요해짐에 따라 국제적인 규격을 준수하는 것은 물론 그 이상의 성능과 안전성이 입증되어야 한다. 유럽의 TSI 기술기준 및 EN 16019에서는 유럽 표준형 연결기 헤드(TYPE-10)에 대하여 스트레인게이지를 특정 위치에 부착하여 강도시험을 진행하도록 규정하고 있으며, 필수적으로 만족해야하는 강도를 지정하고 있다. 이처럼 연결기 헤드에 대하여 국내의 형식승인 뿐 아니라 유럽의 TSI 인증과 같은 국제인증을 획득하기 위해서는 기준, 규격의 강도시험을 진행하여 제품의 성능 및 안전성이 확인되어야 한다. 본 연구에서는 연결기 헤드의 국제적 강도 요구사항의 준수성을 확인하기 위하여 강도분석된 내용을 토대로 강도시험 절차를 수립하고 시험, 검증을 진행하였다. Compliance with technical standards and specifications is essential to the development of railway components. In addition, as certification becomes important to demonstrate excellence of product. And it must be demonstrated its performance and safety as well as compliance of international standards. At European TSI technical standard and EN 16019 stipulate that the strain gauge should be attached to a specific position on the Europe type coupler head(TYPE-10) and the strength test should be carried out. Thus, in order to obtain international certifications such as TSI certification as well as domestic type approval for the coupler head, the performance and safety of the product should be confirmed by conducting the strength test according to the specifications and standards. In this study, the strength test was carried out for confirm compliance with the international strength requirements of the coupler head.
Choi Kyeongbin,Jeong Gyujin,Hyun Soong Keun,Nam Bumhee,Ko Tae Kyung,Lee Chongmu 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.77 No.6
This study reports the effects of NiO nanoparticle (NP) size on the sensing performance of NiO NP-decorated SnO2 nanorods (NRs). NiO NP-decorated SnO2 NRs were synthesized using a two-step process: 1) thermal evaporation of tin powders in an oxidizing atmosphere based on the vapor-liquid-solid growth mechanism and 2) solvothermal decoration of SnO2 NRs with NiO NPs. X-ray diffraction and transmission electron microscopy analyses revealed that both the SnO2 NRs and the NiO NPs were polycrystalline. Scanning electron microscopy images showed that the diameters of the NRs ranged from 100 to 200 nm and that those of the small and the large NiO NPs ranged from 20 to 30 nm and from 80 to 180 nm, respectively. The small NiO NP-decorated SnO2 NRs showed stronger response to NO2 than did the large NiO NP-decorated SnO2 NRs over the concentration range of 0.5 - 100 ppm. Decoration of SnO2 NRs with small NiO NPs resulted in enhanced sensing performance whereas decoration of SnO2 NRs with large NiO NPs deteriorated the sensing performance. The superior NO2 gas sensing performance of the small NiO NP-decorated SnO2 NR sensor as compared to that of the large NiO NP-decorated SnO2 NR sensor was attributed to a higher ratio of n-SnO2 to p-NiO and a higher number of p-n heterojunctions for the same volume of NiO in the former than in the latter. In addition, the small NiO NP-decorated SnO2 NR sensors showed selectivity toward NO2 against other competing gases such as SO2, CO2, CO, H2, C7H8 and C6H6.
Aircraft Allocation System in Air Transportation Network by Mixed-Integer Programming
Wai Nwe Tun,KyeongBin Lee(이경빈),Sangho Kim(김상호),JaeWoo Lee(이재우),SeungHyeog Nah(나승혁) 한국항공우주학회 2015 한국항공우주학회 학술발표회 논문집 Vol.2015 No.11
In this paper, we present how different types of aircrafts are allocated effectively in an air transportation network, giving a guarantee that cargo demands are satisfied and optimizing to minimize transportation cost. The transportation network is mainly based on thirteen Korean airports, resulting to an undirected network with eighteen routes. Basically, nine aircraft models with different aspects are randomly selected and these aircrafts are allocated on each route using mixed-integer linear programming (MIP) genetic algorithm and mixed-integer linear programming method (MILP) supported by Matlab. Evaluations of these two methods are briefly illustrated by providing sensitivity analysis. Validation of the two solvers is performed using a simple mathematical problem.
복합시설 접근성을 이용한 대도시권 스프롤 측정: 광주광역시권을 사례로
양재석 ( Jeasurk Yang ),송하진 ( Hajin Song ),강경빈 ( Kyeongbin Kang ),권민지 ( Minji Gwon ),신휴석 ( Hyu-seok Shin ) 한국도시지리학회 2018 한국도시지리학회지 Vol.21 No.1
접근성을 이용해 도시 스프롤을 측정하는 방법은 주택과 시설 간의 상호작용 측정을 바탕으로 한다. 접근성 가운데 ‘복합시설 접근성’은 다양한 시설들을 사용하여 상호작용을 직접적으로 측정한다는 점에서 주목할 만하다. 하지만 현재까지의 복합시설 접근성 연구는 근린권 내지 도시권 스프롤 현상에 집중되어 있다는 한계가 있다. 도시스프롤 측정을 대도시권으로 확장하지 않을 경우, 대도시권의 스프롤 영향력과 인접 도시권의 스프롤 영향력을 파악하지 못한다는 한계를 낳는다. 이와 같은 한계를 극복하기 위하여 본 연구는 복합시설 접근성을 이용하여 대도시권 스케일 도시 스프롤을 측정하기 위한 방법론을 개발한다. 본 목적을 달성하기 위해 연구자는 기존 방법을 세 가지 측면에서 개선한다. (1) ‘연구 자료’ 측면에서는 자료를 스케일 별로 세분화하였고, (2) ‘계산 방법’ 측면에서는 기존의 K-근접 시설 접근성 방법을 대도시권 스케일로 확장하였다. (3) ‘연구 지역’ 측면에서는 인접 도시권의 영향력을 측정하기 위해 일부가 아닌 전체 대도시권 지역을 연구 지역으로 설정하였다. 본 연구가 제시하는 방법은 스프롤 측정을 대도시권 스케일까지로 확장하고, 스프롤 관리와 정책 입안을 보다 포괄적으로 가능케 한다는 점에서 함의가 있다. Measuring urban sprawl with accessibility approaches is based on measuring interactions between housing and facilities in cities. Among them, multi-facility accessibility is noteworthy in that it measures the interactions directly using various kinds of facilities. However, there is a limit that existing methods of multifacility accessibility, up to now, have been applied only on local and urban scale. Without being applied on metropolitan scale, the methods could not measure influence of metropolitan area and that of adjacent urban area. Based on the limit, this study develops a method for measuring sprawl on metropolitan scale using multi-facility accessibility. To achieve the goal, the authors improve the existing methods in three ways. (1) This study subdivide research data on scales, and (2) expand the existing K-nearest facility accessibility to metropolitan scale. (3) The authors set the whole metropolitan region as research area to measure the influence of adjacent urban area. This study has implications in that it extends the measures to metropolitan scale, which would make sprawl management more comprehensive.
Sukhoon Park,Namjung Kim,Hyunjoon Shin,Kyeongbin Lim,Yong-San Yoon 한국과학기술원 인간친화 복지 로봇 시스템 연구센터 2007 International Journal of Assistive Robotics and Me Vol.8 No.3
Total Hip Arthroplasty is a surgical process that replaces a damaged or fractured hip joint with an artificial femoral stem and acetabular cup. It is one of the most successful operations in orthopedic surgery. However, postsurgical results depend largely on the surgeon’s skill. For a more accurate shaping of the femur as well as alignment of the inserted stem, many surgical robots for THA have been developed and commercialized. The most popular robot system for THA is ROBODOC. An earlier surgery robot showed improved results in terms of the error in the angle and in the fit of implant. However, additional surgical procedures are still required with these systems, as it uses a CT image for registration to obtain the transform between the bone coordinate and the robot coordinates. In the HWRS research group, a compact robot system known as ARTHROBOT was designed. It does not use a CT image for registration. This system uses a block-gagebased <BR>registration; therefore, CT or additional procedures are not needed. This robot is fixed to the femur with bone clamp, and the incision larger than in manual surgery. To reduce the incision size, a robot system that is fixed into the femoral cavity was designed. The performance was acceptable; however, the time required for surgery with this system is exceedingly long. In this study, a control method is suggested to reduce the time that is needed for shaping the femur. Following this, the proposed method is verified with plastic bones and bovine bones.