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Photocycloaddition Reaction of trans-Cinnamonitrile Derivatives with Tetramethylethylene
Chae, Myeong-Yun,Yoon, Suk-Kyoon,Shim, Sang-Chul Korean Chemical Society 1985 Bulletin of the Korean Chemical Society Vol.6 No.2
Stereospecific [2 + 2] cycloadducts are obtained as major products when trans-cinnamonitrile derivatives are irradiated with excess tetramethylethylene. The fluorescence quenching studies, weak exciplex fluorescence, and sensitization by benzophenone suggest that this stereospecific photochemical cycloaddition reaction involves singlet exciplex intermediate formed between cinnamonitrile derivatives and tetramethylethylene.
Chae, Myeong Seok,Cho, Seong Yun,Shin, Kyung Ho 항법시스템학회 2021 Journal of Positioning, Navigation, and Timing Vol.10 No.3
To estimate the location of the train, we consider an integrated navigation system that combines Inertial Navigation System (INS) and Global Navigation Satellite System (GNSS). This system provides accurate navigation results in open sky by combining only the advantages of both systems. However, since measurement update cannot be performed in GNSS signal blocked areas such as tunnels, mountain, and urban areas, pure INS is used. The error of navigation information increases in this area. In order to reduce this problem, the train's Non-Holonomic Constraints (NHC) information can be used. Therefore, we deal with the INS/GNSS/NHC integrated navigation system in this paper. However, in the process of installing the navigation system on the train, a Mounting Misalignment Error of the IMU (MMEI) inevitably occurs. In this case, if the NHC is used without correcting the error, the navigation error becomes even larger. To solve this problem, a method of easily estimating the MMEI without an external device is introduced. The navigation filter is designed using the Extended Kalman Filter (EKF) by considering the MMEI. It is assumed that there is no vertical misalignment error, so only the horizontal misalignment error is considered. The performance of the integrated navigation system according to the presence or absence of the MMEI and the estimation performance of the MMEI according to the method of using NHC information are analyzed based on simulation. As a result, it is confirmed that the MMEI is accurately estimated by using the NHC information together with the GNSS information, and the performance and reliability of the integrated navigation system are improved.
운전조건변화에 따른 트윈 로터리 압축기의 기계손실 분석
신명수(Myeong Su Shin),나상경(Sang Kyung Na),민병채(Byung Chae Min),최윤혁(Yun Hyuk Choi),최경민(Gyung Min Choi) 대한설비공학회 2017 대한설비공학회 학술발표대회논문집 Vol.2017 No.6
This paper is a study on the mechanical loss of the twin rotary compressor with evaporating temperature and condensing temperature. The simulation results were verified by the manufacturer data. Cooling capacity and compressor input power were consistent with the manufacturer data within 4.59 and 6.79 %, respectively. Total mechanical loss increase with an increase of evaporating pressure and condensing pressure. The loss between vane and vane slot and the loss between roller and eccentric have a large portion on total mechanical loss.
CKF 기반 상태 확장을 통해 IMU 의 장착 비정렬을 보상하는 차량용 복합항법시스템
채명석(Myeong Seok Chae),조성윤(Seong Yun Cho) 제어로봇시스템학회 2021 제어·로봇·시스템학회 논문지 Vol.27 No.12
The navigation information of autonomous vehicles is very important not only for determining the driving route but also for controlling the vehicle. Therefore, the navigation information must exhibit a high short-term/long-term stability and accuracy, and high output frequency. Accordingly, navigation systems are configured by integrating various sensors, and a representative inertial navigation system (INS)/global positioning system (GPS) integrated navigation system has been used. In tunnels and urban areas, however, the continuity of INS error correction is not guaranteed owing to the blocking and contamination of GPS signals, and the operation of a standalone INS increases navigation error. To address this problem, the construction of an INS/GPS/non-holonomic constraints (NHC) integrated navigation based on the NHC-based movement of the land vehicle has been utilized (that is, the information in which the lateral and vertical velocities of the vehicle are 0 was used). However, the misalignment of the sensing axis of IMU with the body coordinate system of the vehicle results in the collapse of the NHC condition, which increases the INS error. To address this problem, in this study, a navigation filter was designed to estimate/compensate not only the INS errors but also the mounting misalignment of the IMU by extending the state based on the cubature Kalman filter (CKF). In addition, the accuracy of navigation information according to whether NHC information was used or not and whether it is mixed with GPS measurements was verified based on Monte Carlo simulation.
Network analysis of drug-related problems in hospitalized patients with hematologic malignancies
Kim, Myeong Gyu,Jeong, Chae Reen,Kim, Hyun Jee,Kim, Jae Hyun,Song, Yun-Kyoung,Kim, Kyung Im,Ji, Eunhee,Yoon, Sung-Soo,Koh, Youngil,Cho, Yoon-Sook,Kim, In-Wha,Oh, Jung Mi Springer-Verlag 2018 SUPPORTIVE CARE IN CANCER Vol.26 No.8
파도를 고려한 2축 회전형 관성항법시스템의 안정화 기법
채명석(Myeong-Seok Chae),조성윤(Seong-Yun Cho),박찬국(Chan-Gook Park),조민수(Min-Su Jo),박찬주(Chan-Joo Park) 한국전자통신학회 2024 한국전자통신학회 논문지 Vol.19 No.2
Ⅰ. 서 론 Ⅱ. 2축 회전형 관성항법시스템 Ⅲ. 파도를 고려한 RINS의 안정화 기법 Ⅳ. 시뮬레이션 기반 성능 분석 Ⅴ. 결론 References 회전형 관성항법시스템은 IMU(: Inertial Measurement Unit)를 김블 위에 장착하고 김블을 규칙적으로 회전시켜 IMU의 오차를 상쇄시킴으로써 보다 정확한 항법 정보를 제공할 수 있다. 그러나 파도에 의해 자세 변화가 생기면 회전절차의 한 주기가 끝나는 시점에 자세 오차가 0으로 상쇄되지 않게 되어 큰 위치 오차를 유발한다. 본 논문에서는 이 문제를 고려하여 항체의 롤각 정보를 기반으로 외부 김블을 회전시켜 안정화를 시키는 방법을 제안한다. 시뮬레이션을 기반으로 파도에 의한 영향을 분석하고 외부 김블 안정화의 성능을 검증한다.