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고슬립을 이용한 6 륜구동/6 륜조향 차량 고장 안전 주행 제어
나재원(Jae Won Nah),김원균(Won Gun Kim),이경수(Kyongsu Yi),이종석(Jongseok Lee),이대옥(Daeok Lee) 대한기계학회 2013 大韓機械學會論文集A Vol.37 No.6
본 논문은 6 륜 독립구동/독립조향 차량의 독립 스티어-바이-와이어 장치의 고장 안전 주행 제어 방법을 제시하였다. 조향부 고장 휠의 횡방향 타이어 힘이 차량 선회 운동에 저항력으로 작용할 수 있으므로, 이를 줄이기 위하여 본 고장 안전 주행 제어 알고리즘은 조향부 고장 휠에 높은 슬립률이 발생 하도록 토크 입력을 가한다. 고슬립으로 인한 조향부 고장 휠의 종방향 타이어 힘 증가를 고려하기 위하여 종방향 타이어 힘을 추정하여 고장나지 않은 휠의 구동력 최적 분배에 구속 조건에 포함시킨다. 개루프 조향 및 폐루프 조향 시뮬레이션 결과 조향부 고장이 발생한 차량의 주행시 고장을 고려하지 않은 최적 구동력 분배 제어에 비하여 본 알고리즘 적용시 차량의 주행 성능이 보정됨을 확인하였다. This paper describes a fault-tolerant driving control strategy for an independent steer-by-wire system in sixwheel-drive/six-wheel-steering vehicles. An algorithm has been designed to realize vehicle maneuverability that is as close as possible to that of non-faulty vehicles by inducing high slip ratio of the wheel through a faulty steer-by-wire system in order to reduce the lateral tire force, which is resistant to the yaw motion. Considering the transition of the longitudinal tire force of a wheel with a faulty steer-by-wire component, the longitudinal tire forces are optimally distributed to the other wheels. Fault-tolerant driving performance has been investigated via computer simulations. Simulation studies show that the proposed algorithm can significantly improve the maneuverability of a vehicle with a faulty steer-by-wire system as compared to the optimal traction distribution method.
Feline Demographics and Disease Distribution in the Republic of Korea
Jongseok Lee,Son-il Pak,Kija Lee,Ho-jung Choi,Young-Won Lee,In-chul Park,최수영 한국임상수의학회 2022 한국임상수의학회지 Vol.39 No.5
The population of pet cats has increased significantly, from 0.3% in 2002 to 5.6% in 2017. Large-scale feline demographic and disease data from Korea are lacking. The aim of this study was to investigate the demographic data (breed, sex, and age) and disease distribution of cats who visited private veterinary practices in Korea. Data including breed, sex, age, and disease, were compiled from 32,728 electronic medical records from 30 selected private vet- erinary practices, between January 1, 2016, and December 31, 2017. Diseases were classified based on the International Classification of Diseases 11 by the World Health Organization, and then compared and cross-analyzed according to breed, sex, and age. Korean shorthair was the most common breed. There was a high distribution of young cats, with 77.6% of the cats under 4 years of age, and an average age of 2.5 years. Diagnoses related to preventative medicine were the most frequent and diagnoses common to young cats had higher incidence. This demographic data and information about disease distribution can be used as a basis for future research and may be helpful for determining priorities in the diagnosis of diseases and establishing strategies for health management in cats.
오드 연결망 O<SUB>d</SUB>에서 에지 중복 없는 최적 스패닝 트리를 구성하는 알고리즘
김종석(Jongseok Kim),이형옥(Hyeongok Lee),김성원(Sung Won Kim) 한국정보과학회 2009 정보과학회논문지 : 시스템 및 이론 Vol.36 No.5
오드 연결망은 그래프이론 모델의 하나로 발표되었는데, [1]에서 고장허용 다중컴퓨터에 대한 하나의 모형으로 소개되었고, 여러 가지 유용한 성질들 - 간단한 라우팅 알고리즘, 최대고장허용도, 노드 중복 없는 경로 등 - 이 분석되었다. 본 논문에서는 오드 연결망 O<SUB>d</SUB> 에서 에지 중복 없는 스패닝 트리를 구성하는 알고리즘을 제안한다. 그리고 제안한 알고리즘에 의해 구성된 에지 중복 없는 스패닝 트리가 에지 중복 없는 최적 스패닝 트리임을 증명한다. Odd network was introduced as one model of graph theory. In [1], it was introduced as a class of fault-tolerant multiprocessor networks and analyzed so many useful properties such as simple routing algorithms, maximal fault tolerance, node axsjoint path, etc. In this paper, we sauw a construction algorithm of edge-axsjoint spanning trees in Odd network O<SUB>d</SUB>. Also, we prove that edge-disjoint spanning tree generated by our algorithm is optimal edge-disjoint spanning tree.
Improvement of Robotic Mechanism for Automated Biopsy
Youngjin Moon,Jongseok Won,Sanghoon Park,Jaesoon Choi 제어로봇시스템학회 2015 제어로봇시스템학회 국제학술대회 논문집 Vol.2015 No.10
This paper presents improved robotic mechanism for automated biopsy procedure. Needle insertion type intervention has the advantages of minimal invasiveness and fast recovery of the patient, but radiation exposure of the clinician and patient and dependency of insertion accuracy on the clinician’s skill are drawbacks. The robotic intervention system is a solution of the problems. As one component of the system, the robotic mechanism for biopsy has been developed. The previous robot mechanism sequentially performs all the processes of the biopsy except the anesthesia, but more practical problems such as robust operation, necessity of down-scaling, and safety issue should be considered. The biopsy robot model II-B is the revised version of the previous models. The modifications include adding a cartridge rotation checker and needle stoppers, renovating cartridge connection method, the spring loader, and spring block mover, and etc. Effectiveness of the improved functions is verified by experiment.
폴디드 하이퍼큐브와 HFH 네트워크 사이의 임베딩 알고리즘
김종석,이형옥,김성원,Kim, Jongseok,Lee, Hyeongok,Kim, Sung Won 한국정보처리학회 2013 정보처리학회논문지. 컴퓨터 및 통신시스템 Vol.2 No.4
본 논문에서는 폴디드 하이퍼큐브와 HFH 네트워크 사이의 임베딩을 분석한다. 폴디드 하이퍼큐브 $FQ_{2n}$는 HFH($C_n,C_n$)에 연장율 4, 확장율 $\frac{(C_n)^2}{2^{2n}}$에 임베딩 가능함을 보이고, HFH($C_d,C_d$)를 폴디드 하이퍼큐브 $FQ_{4d-2}$에 임베딩하는 비용은 O(d)임을 보인다. In this paper, we will analyze embedding between Folded Hypercube and HFH. We will show Folded Hypercube $FQ_{2n}$ can be embedded into HFH($C_n,C_n$) with dilation 4, expansion $\frac{(C_n)^2}{2^{2n}}$ and HFH($C_d,C_d$) can be embedded into $FQ_{4d-2}$ with dilation O(d).
Dongwook Son,Pyeongjae Lee,Jongseok Lee,Sanghyun Lee,Sang Yoon Choi,Jong-Won Lee,Sun Yeou Kim 한국식품과학회 2007 Food Science and Biotechnology Vol.16 No.4
This study examined the neuroprotective effect of scopoletin from Angelica dahurica against oxygen and glucose deprivation-induced neurotoxicity in a rat organotypic hippocampal slice culture. Scopoletin reduced the propidium iodide (PI) uptake, which is an indication of impaired cell membrane integrity. In addition, it inhibited the loss of NeuN, which represents the viability of neuronal cells. The results suggests that scopoletin from A. dahurica protects neuronal cells from the damage caused by oxygen and glucose deprivation.