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김정래(Jeongrae Kim),김태준(Taejoon Kim),신충화(Chunghwa Shin),이제홍(Jehong Lee),이희용(Heeyoung Lee) 한국자동차공학회 2016 한국자동차공학회 학술대회 및 전시회 Vol.2016 No.11
In this study, clutch adaptation algorithm for auto transmission with non-driving condition was proposed. As part of the first study, a survey was evaluated the pressure control of the clutch adaptation control with driving condition. Based on the current pressure adaptation system, new clutch control system was constructed and a MATLAB/Simulink simulator was developed. With this study, TCU(proposed control algorithm) can work more effectively the clutch adaptation of all pressure system with non-driving condition.
Analysis of Korean Facial Measurements for Sizing System of Face Wearable Products
Baekhee Lee,Nahyeon Lee,Younggeun Choi,Eunjin Jeon,Kwangae Park,Boyoung Park,Wonsup Lee,Hee-Eun Kim,Jeongrae Lee,Junghee Won,Hyoseon Kim,Younghyun Kim,Heecheon You 대한인간공학회 2015 대한인간공학회 학술대회논문집 Vol.2015 No.10
Objective: The present study is to analyze Korean facial dimensions and select facial key dimension candidates for establishing a sizing system of face wearable products such as dust mask and oxygen mask. Background: An anthropometric sizing system accommodating different facial characteristics of the target population can contribute to improving usability of the face wearable product. Method: Facial key dimension candidates were selected by correlation analysis among 19 facial dimensions. Korean facial sizes measured by KATS (2004, 2010) and Lee et al. (2013) were compared to Chinese facial sizes measured by Du et al. (2008) to each facial key dimension candidate. Results: Face length, bitragion breadth, bitragion-subnasale arc, and bitragion-pronasale arc were selected as facial key dimension candidates. The face length of Korean was 6.6 mm longer compared to that for Chinese; the bitragion-subnasale arc 17.4 mm shorter. Conclusion: The present study proposed four facial key dimensions for Korean face wearable product sizing systems. Found that Korean have longer face length and lower cheekbones compared to Chinese. Application: The facial key dimension and corresponding analysis result can be applied to design for sizing system of Korean facial wearable products.
Eunsung Lee,Sebum Chun,Young Jae Lee,Teasam Kang,Gyu-In Jee,Jeongrae Kim 대한전기학회 2007 International Journal of Control, Automation, and Vol.5 No.4
This paper describes a multipath estimation method for Global Positioning System (GPS) dual frequency carrier phase measurements. Multipath is a major error source in high precision GPS applications, i.e., carrier phase measurements for precise positioning and attitude determinations. In order to estimate and remove multi path at carrier phase measurements, an array GPS antenna system has been used. The known geometry between the antennas is used to estimate multi path parameters. Dual frequency carrier phase measurements increase the redundancy of measurements, so it can reduce the number of antennas. The unscented Kalman filter (UKF) is recently applied to many areas to overcome some of the limitations of the extended Kalman filter (EKF) such as weakness to severe nonlinearity. This paper uses the UKF for estimating multi path parameters. A series of simulations were performed with GPS antenna arrays located on a straight line with one reflector. The geometry information of the antenna array reduces the number of estimated multipath parameters from four to three. Both the EKF and the UKF are used as estimation algorithms and the results of the EKF and the UKF are compared. When the initial parameters are far from true parameters, the UKF shows better performance than the EKF.
Protecting Signal Integrity Against Atomic Clock Anomalies on Board GNSS Satellites
Seung-Woo Lee,Jeongrae Kim,Young Jae Lee IEEE 2011 IEEE transactions on instrumentation and measureme Vol.60 No.7
<P>This paper introduces a method of detecting atomic clock anomalies for Global Navigation Satellites System (GNSS) satellites in real-time mode and presents some results obtained by monitoring actual GNSS satellite clocks. The method employs a Kalman filter formulation which facilitates the real-time processing of GNSS carrier-phase measurements. Judgment regarding clock anomalies is made using the prediction interval approach and actual distribution of predicted phase and frequency error is replaced by overbounding Gaussian distribution. Results show that the method could be a suitable method to detect GNSS clock events.</P>
이한석,도근영,조정래 한국해양대학교 해양과학기술연구소 2000 硏究論文集 Vol.9 No.2
This study aims to set up the design guidelines of cabling spaces for telecommunication systems in cyber apartment housing. The cabling spaces in cyber apartment housing are composed of entrance facilities, main distribution room, equipment room, horizontal pathways, backbone pathways, electric power shaft room, distribution device, telecommunication outlet. In this paper the guidelines for designing each space have been suggested. These guidelines will be elaborated and tested through our further study on the performance of cyber apartment housing.
Performance evaluation of real-time carrier-phase GPS time transfer
Lee, Seung Woo,Kim, Jeongrae IOP Pub 2009 Measurement Science and Technology Vol.20 No.6
<P>A real-time GPS time transfer system was developed to measure the phase difference between clocks at the sub-nanosecond level. The relative performance of the system was assessed with other contemporary time transfer methods and several issues regarding real-time GPS time transfer were addressed, including the use of a sequential data processor and establishment of a real-time data link. By use of the Kalman estimator, a two-state clock model is incorporated into system dynamics and the classical client–server model is utilized to establish GPS data links via TCP/IP communication. To reduce part of the time transfer errors related to satellite position and clock biases, IGS ultra-rapid products are used. Validation of the real-time GPS time transfer system was performed in two ways, through the use of a common-clock signal and through direct measurement of the phase difference with a time interval counter. Finally, a 5 month long time transfer session was conducted among four national timing laboratories and the results were compared against those obtained with TWSTFT and <I>Circular T</I> issued by the Bureau International des Poids et Mesures.</P>
Ionospheric Storm and Spatial Gradient Analysis for GBAS
Jeongrae Kim,Tae Hyoung Yang,Young Jae Lee,Hyang Sig Jun,Gi Wook Nam 한국항해항만학회 2006 한국항해항만학회 학술대회논문집 Vol.1 No.-
High ionospheric spatial gradient during ionospheric storm is most concern for the landing approach with GNSS (Global Navigation Satellite System) augmentation systems. In case of the GBAS (Ground-Based Augmentation System), the ionospheric storm causes sudden increase of the ionospheric delay difference between a ground facility and a user (aircraft), and the aircraft position error increases significantly. Since the ionosphere behavior and the storm effect depend on geographic location, understanding the ionospheric storm behavior at specific regional area is crucial for the GNSS augmentation system development and implementation. Korea Aerospace Research Institute and collaborating universities have been developing an integrity monitoring test bed for GBAS research and for future regional augmentation system development. By using the dense GPS (Global Positioning System) networks in Korea, a regional ionosphere map is constructed for finding detailed aspect of the ionosphere variation. Preliminary analysis on the ionospheric gradient variation during a recent storm period is performed and the results are discussed.