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RF performance Analysis for Galileo Receiver Design
Sanghyun Chang,Ilkyoo Lee,Dongpil Chang,Youngwoo Lee,Seunghyeup Oh 대한전자공학회 2010 ICEIC:International Conference on Electronics, Inf Vol.1 No.1
This paper presents the effects of RF performance parameters on the Galileo receiver design via simulation after reviewing the requirements of the Galileo receiver structure. At first, we considered the general requirements, structure and characteristics of the Galileo system. Then we designed the Galileo receiver focused on performance requirement of 16 ㏈ C/N which is equal to 15 % Error Vector Magnitude (EVM) by using Advanced Design System (ADS) simulation program. In order to verify the function of Automatic Gain Control (AGC)), we measured the IF output power level by changing the input power level at the front - end of the receiver. We analyzed the performance degradation due to phase noise variations of Local Oscillator (LO) in the Galileo receiver through EVM when the minimum sensitivity level of -127 ㏈m is applied at the receiver. We also analyzed the performance degradation according to variable Analog-to-Digital Converter (ADC) bits within the Dynamic range, -92 ~ -139 ㏈m, which has been defined by gain range (-2.5 ~ +42.5 ㏈) in the AGC operation. The results clearly show that the performance of the Galileo receiver can be improved by increasing ADC bits and reducing Phase Noise of LO.
Zhang, Li,Chen, Xiaoyun,Cheng, Yanqi,Chen, Qilong,Tan, Hongsheng,Son, Dongwook,Chang, Dongpill,Bian, Zhaoxiang,Fang, Hong,Xu, Hongxi The Korean Society of Ginseng 2019 Journal of Ginseng Research Vol.43 No.4
Background: Korean Red Ginseng (KRG) is widely used for strengthening the immune system and fighting fatigue, especially in people with deficiency syndrome. However, there is concern that the long-term application or a high dose of KRG can cause "fireness" (上火 in Chinese) because of its "dryness" (燥性 in Chinese). The aim of this study was to assess the safety and efficacy of a 4-week treatment with KRG in participants with deficiency syndrome. Methods: This was a 4-week, randomized, double-blind, placebo-controlled clinical trial. A total of 180 Chinese participants were randomly allocated to three groups: placebo control group, participants were given a placebo, 3.6 g/d; KRG 1.8 g and 3.6 g groups. The primary outcomes were the changes in fireness and safety evaluation (adverse events, laboratory tests, and electrocardiogram). The secondary outcomes were the efficacy of KRG on fatigue, which include the following: traditional Chinese medicine (TCM) symptom scale and fatigue self-assessment scale. Results: Of the 180 patients, 174 completed the full study. After 4 weeks of KRG treatment, the Fire-heat symptoms score including Excess fire-heat score and Deficient fire-heat score showed no significant change as compared with placebo treatment, and no clinically significant changes in any safety parameter were observed. Based on the TCM syndrome score and fatigue self-assessment score, TCM symptoms and fatigue were greatly improved after treatment with KRG, which showed a dose- and time-dependent effect. The total effective rate was also significantly increased in the KRG groups. Conclusion: Our study revealed that KRG has a potent antifatigue effect without significant adverse effects in people with deficiency syndrome. Although a larger sample size and longer treatment may be required for a more definite conclusion, this clinical trial is the first to disprove the common conception of "fireness" related to KRG.
Li Zhang,Xiaoyun Chen,Yanqi Cheng,Qilong Chen,Hongsheng Tan,Dongwook Son,Dongpill Chang,Zhaoxiang Bian,Hong Fang,Hongxi Xu 고려인삼학회 2019 Journal of Ginseng Research Vol.43 No.4
Background: Korean Red Ginseng (KRG) is widely used for strengthening the immune system andfighting fatigue, especially in people with deficiency syndrome. However, there is concern that the longtermapplication or a high dose of KRG can cause “fireness” (上火in Chinese) because of its “dryness” (燥性in Chinese). The aim of this study was to assess the safety and efficacy of a 4-week treatment with KRGin participants with deficiency syndrome. Methods: This was a 4-week, randomized, double-blind, placebo-controlled clinical trial. A total of 180Chinese participants were randomly allocated to three groups: placebo control group, participants weregiven a placebo, 3.6 g/d; KRG 1.8 g and 3.6 g groups. The primary outcomes were the changes in firenessand safety evaluation (adverse events, laboratory tests, and electrocardiogram). The secondary outcomeswere the efficacy of KRG on fatigue, which include the following: traditional Chinese medicine (TCM)symptom scale and fatigue self-assessment scale. Results: Of the 180 patients, 174 completed the full study. After 4 weeks of KRG treatment, the Fire-heatsymptoms score including Excess fire-heat score and Deficient fire-heat score showed no significantchange as compared with placebo treatment, and no clinically significant changes in any safetyparameter were observed. Based on the TCM syndrome score and fatigue self-assessment score, TCMsymptoms and fatigue were greatly improved after treatment with KRG, which showed a dose- and timedependenteffect. The total effective rate was also significantly increased in the KRG groups. Conclusion: Our study revealed that KRG has a potent antifatigue effect without significant adverse effectsin people with deficiency syndrome. Although a larger sample size and longer treatment may berequired for a more definite conclusion, this clinical trial is the first to disprove the common conceptionof “fireness” related to KRG.
Ku-Band Power Amplifier MMIC Chipset with On-Chip Active Gate Bias Circuit
노윤섭,Dongpil Chang,In-Bok Yom 한국전자통신연구원 2009 ETRI Journal Vol.31 No.3
We propose a Ku-band driver and high-power amplifier monolithic microwave integrated circuits (MMICs) employing a compensating gate bias circuit using a commercial 0.5 μm GaAs pHEMT technology. The integrated gate bias circuit provides compensation for the threshold voltage and temperature variations as well as independence of the supply voltage variations. A fabricated two-stage Ku-band driver amplifier MMIC exhibits a typical output power of 30.5 dBm and poweradded efficiency (PAE) of 37% over a 13.5 GHz to 15.0 GHz frequency band, while a fabricated three-stage Kuband high-power amplifier MMIC exhibits a maximum saturated output power of 39.25 dBm (8.4 W) and PAE of 22.7% at 14.5 GHz.
Lee, Dongpil,Yi, Kyongsu,Chang, Sehyun,Lee, Byungrim,Jang, Bongchoon Elsevier 2018 Mechatronics Vol.49 No.-
<P><B>Abstract</B></P> <P>This paper describes robust steering assist torque control of electric-power-assisted-steering (EPAS) systems for a target steering wheel torque tracking. The steering assist torque control algorithm has been developed to overcome the major disadvantage of the conventional method of time-consuming tuning to achieve the desired steering feel. A reference steering wheel torque map was designed by post-processing data obtained from target performance vehicle tests with a highly-rated steering feel for both sinusoidal and transition steering inputs. Adaptive sliding-mode control was adopted to ensure robustness against uncertainty in the steering system, and the equivalent moment of inertia damping coefficient and effective compliance were adapted to improve tracking performance. Effective compliance played a role in compensating the error between the nominal rack force and the actual rack force. The performance of the proposed controller was evaluated by conducting computer simulations and a hardware-in-the-loop simulation (HILS) under various steering conditions. Optimal steering wheel torque tracking performances were successfully achieved by the proposed EPAS control algorithm.</P>
목표 조타토크 맵 기반 랙반력 피드백 MDPS 제어로직 개발
장세현(Sehyun Chang),이병림(Byung Rim Lee),박영대(Young Dae Park),조현석(Hyun Seok Jo),김민준(Minjun Kim),장봉춘(Bongchoon Jang),이동필(Dongpil Lee) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5
This paper proposes new rack force feedback control logic of a motor driven power steering (MDPS). The proposed control logic consists of a 3 dimensional map of target steering torque and control logic for target torque following. The 3 dimensional map of steering torque is defined by using target steering torque vs. steering angle curves of weave and transition tests. This 3 D map of steering torque provides control logic with target steering torque according to steering angle and angular velocity inputs. Then adaptive sliding mode control (ASMC) determines steering assist torque in order to achieve the target steering torque. ASMC is designed by considering rack force, steering system friction, and uncertainty of a steering system to reach a sliding surface which is defined by combining target torque tracking error and its integral. Simulation study is used to investigate the performance of the proposed control first, and then Hardware-in-the-Loop Simulation(HILS) is utilized in order to evaluate its performance in a real steering system. It shows that the proposed control logic can achieve excellently the target steering torque with respect to on-center steering tests.