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電壓形 PWM Inverter에 依한 誘導電動機의 精密 速度制御
金玟會,鄭瓊採,金東熙,李達海,黃敦夏 嶺南大學校 工業技術硏究所 1992 연구보고 Vol.20 No.1
For precision control of Induction Motor with Voltage Source PWM Inverter, the current component should be converted into the voltage one. We are in difficulties for precision control with simple current feedback control because of the oscillation in system and torque ripple on high speed rotation and transient switching resulted from the disturbance which is generated by the mutual interference between d-axis and q-axis during conversion. This paper propose linearized Decoupling Control Theory in Field-Oriented Control and presents controllable system with Microcomputer software in the whole control system. In addition, by experiment it is proved that the system is controlled well in both steady and transient states. The proposed system is expected to be applied in industrial AC Servo System.
김동희,정경채,김민희,황돈하,이달해 嶺南大學校 工業技術硏究所 1994 工業技術硏究所論文集 Vol.22 No.1
Recently, the vector controlled induction motors are widely used in the industrial AC servo system requiring high accuracy and fast response. However, in the conventional vector control, by using of speed sensors for speed information of the motor, the system design has been restricted. This paper proposes te vector control system based on speed estimation controls motor speed by estimating angular speed of secondary flux linkages from voltage equations of induction motor without speed and voltage sensor. To stabilize the control system for estimation, the ??-axis flux keeps to zero by the compensation control method with state feedback. In addition, the whole control system is designed to be controlled by software in microcomputer. Computer simulations domonstrates that the control characteristics of the proposed vector control system based on speed estimation are satisfactory in both dynamic performance and accuracy.
Choe Wonho,Chae Jeong-Don,Yang John Jeongseok,Hwang Sang-Hyun,Choi Sung-Eun,Oh Heung-Bum 대한진단검사의학회 2021 Annals of Laboratory Medicine Vol.41 No.3
Background: Recent studies have successfully implemented next-generation sequencing (NGS) in HLA typing. We performed HLA NGS in a Korean population to estimate HLA-A, -B, -C, and -DRB1 allele and haplotype frequencies up to an 8-digit resolution, which might be useful for an extended application of HLA results. Methods: A total of 128 samples collected from healthy unrelated Korean adults, previously subjected to Sanger sequencing for 6-digit HLA analysis, were used. NGS was performed for HLA-A, -B, -C, and -DRB1 using the AllType NGS kit (One Lambda, West Hills, CA, USA), Ion Torrent S5 platform (Thermo Fisher Scientific, Waltham, MA, USA), and Type Steam Visual NGS analysis software (One Lambda). Results: Eight HLA alleles showed frequencies of ≥10% in the Korean population, namely, A*24:02:01:01 (19.5%), A*33:03:01 (15.6%), A*02:01:01:01 (14.5%), A*11:01:01:01 (13.3%), B*15:01:01:01 (10.2%), C*01:02:01 (19.9%), C*03:04:01:02 (11.3%), and DRB1*09:01:02 (10.2%). Nine previous 6-digit HLA alleles were further identified as two or more 8-digit HLA alleles. Of these, eight alleles (A*24:02:01, B*35:01:01, B*40:01:02, B*55:02:01, B*58:01:01, C*03:02:02, C*07:02:01, and DRB1*07:01:01) were identified as two 8-digit HLA alleles, and one allele (B*51:01:01) was identified as three 8-digit HLA alleles. The most frequent four-loci haplotype was HLA-A*33:03:01-B*44:03:01:01-C*14: 03-DRB1*13:02:01. Conclusions: We identified 8-digit HLA-A, -B, -C, and -DRB1 allele and haplotype frequencies in a healthy Korean population using NGS. These new data can be used as a representative Korean data for further disease-related HLA type analysis.