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차창준,전체옥,Ki-seong Joh,Won Yong Kim,김승범,김명겸,Jung-Hoon Yoon 국립생물자원관 2023 Journal of species research Vol.12 No.-
During screening for indigenous prokaryotic species in Republic of Korea in 2021, a total of 21 bacterial strains assigned to the phylum Bacteroidota were isolated from a variety of environmental habitats including pine cone, seaweed, soil, sea sediment, brackish water and moss. Based on the 16S rRNA gene sequence similarity value of more than 98.7% and formation of a robust phylogenetic clade with the type strain of the closest bacterial species, it was found that the 21 strains belong to independent and recognized bacterial species. There has been no official report that the identified 21 species have been isolated in Republic of Korea up to date. Therefore, 16 species in six genera of two families in the order Flavobacteriales, two species in two genera of two families in the order Cytophagales, one species in one genus of one family in the order Chitinophagales and two species in one genus of one family in the order Sphingobacteriales are proposed as unrecorded species of the phylum Bacteroidota isolated in Republic of Korea. Their Gram reaction, colony and cell morphology, basic phenotypic characteristics, isolation source, taxonomic status, strain ID and other information are described in the species descriptions.
분할 코어를 적용한 EPS용 SPMSM의 공차에 따른 코깅 토크 분석
차창준(Chang-Jun Cha),박진철(Jin-Cheol Park),박민로(Min-Ro Park),임명섭(Myung-Seop Lim),이충성(Choong-Sung Lee) 한국자동차공학회 2019 한국자동차공학회 학술대회 및 전시회 Vol.2019 No.11
The Electric Power Steering(EPS) system is directly related to safety. So, the whole system is mechanically connected. Due to mechanical characteristics of the steering system, vibrations generated by the EPS motor are transmitted to the driver. Cogging torque is generated by the interaction between the permanent magnet and the slot structure. Cogging torque is one of the torque ripple components. This paper investigates the cogging torque according to manufacturing tolerance of SPMSM with Segmented-Core for EPS. First, manufacturing tolerances for each part of the motor will be introduced. Then, the harmonics of the cogging torque due to each manufacturing tolerance of the motor part are analyzed. Finally, by comparing the simulation result with test value, the validity of this study is demonstrated.
EPS용 SPMSM의 회전자 형상에 따른 효율 및 열 특성 개선 설계
차창준(Chang-Jun Cha),박진철(Jin-Cheol Park),박민로(Min-Ro Park),박현진(Hyeon-Jin Park),홍정표(Jung-Pyo Hong) 한국자동차공학회 2019 한국자동차공학회 부문종합 학술대회 Vol.2019 No.5
Electrical Power Steering(EPS) system that assist driver’s vehicle steering is one of the core parts of the vehicle. In addition, the EPS motors require very low vibration and high performance for vehicle stability. In this paper, the electrical parameters of EPS motor is converted into the function of the rotor shape. Using this function, the efficiency and thermal characteristics of the EPS motor are analyzed according to the rotor shape. Then, the design point with high efficiency and improved thermal characteristics is determined as the sizing effect. Then, the improved model is designed. Finally the validity of the improvement model is confirmed by comparing the efficiency and thermal characteristics of the improved model with the existing model.
분할코어를 적용한 EPS용 SPMSM의 극, 슬롯 수에 따른 조립공차에 의한 코깅토크 분석
차창준(Chang-Jun Cha),박진철(Jin-Cheol Park),김동민(Dong-Min Kim),박민로(Min-Ro Park),임명섭(Myung-Seop Lim) 한국자동차공학회 2020 한국자동차공학회 부문종합 학술대회 Vol.2020 No.7
As interest in the environment increase, the automobile parts market is increasingly trying to change from the mechanical system to the electrical system. In order to replace the mechanical system with the electrical system, many studies have been conducted to improve the performance of the electrical system because the electrical system must perform better than the mechanical system. However, there are few studies on tolerances that occur during actual production compared to studies on improving electrical performance. Due to the tolerances that occur during production, products with lower performance than actually expected can be produced. This paper intends to confirm the change in motor cogging torque due to the stator inner diameter tolerance applied to the segmented core, which is frequently applied to motors.
수학적 모델과 폭발사고 모델링을 통한 산화에틸렌 공정의 설비 배치 최적화에 관한 연구
차상훈,이창준 한국안전학회 2020 한국안전학회지 Vol.35 No.1
In most plant layout optimization researches, MILP(Mixed Integer Linear Programming) problems, in which the objective function includes the costs of pipelines connecting process equipment and cost associated with safety issues, have been employed. Based on these MILP problems, various optimization solvers have been applied to investigate the optimal solutions. To consider safety issues on the objective function of MILP problems together, the accurate information about the impact and the frequency of potential accidents in a plant should be required to evaluate the safety issues. However, it is really impossible to obtain accurate information about potential accidents and this limitation may reduce the reliability of a plant layout problem. Moreover, in real industries such as plant engineering companies, the plant layout is previously fixed and the considerations of various safety instruments and systems have been performed to guarantee the plant safety. To reflect these situations, the two step optimization problems have been designed in this study. The first MILP model aims to minimize the costs of pipelines and the land size as complying sufficient spaces for the maintenance and safety. After the plant layout is determined by the first MILP model, the optimal locations of blast walls have been investigated to maximize the mitigation impacts of blast walls. The particle swarm optimization technique, which is one of the representative sampling approaches, is employed throughout the consideration of the characteristics of MILP models in this study. The ethylene oxide plant is tested to verify the efficacy of the proposed model.
대한민국 농지 토양에서 분리된 트리클로산 내성 Pseudomonas sp. Tri1의 완전한 유전체 서열
김용석,차창준 한국미생물학회 2021 미생물학회지 Vol. No.
Triclosan-resistant Pseudomonas sp. strain Tri1 was isolatedfrom a farmland soil in Anseong, South Korea. The genome ofstrain Tri1 was assembled to a single contig that consists of6,707,950 bp with a G + C content of 60.51%. The completegenome sequence contained 5,433 protein-coding genes, 17rRNA genes and 66 tRNA genes. Strain Tri1 contained fabVgene which is known to confer triclosan resistance. 트리클로산에 내성을 갖는 Pseudomonas sp. Tri1 균주가대한민국 안성의 농지 토양에서 분리되었다. Tri1 균주의 유전체는 크기가 6,707,950 bp이고 G + C 함량이 60.51%인 단일contig로 조립되었다. Tri1 균주의 완전한 유전체 서열은 5,433개의 단백질 코딩 유전자, 17개의 rRNA 유전자 및 66개의tRNA 유전자를 포함하였다. Tri1 균주는 트리클로산 내성을주는 것으로 알려진 fabV 유전자를 가지고 있었다.