• Title/Summary/Keyword: AGC

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Introduction of Integral Controller and Its Tuning for the improvements of AGC performance (자동발전제어(AGC) 제어 성능 개선을 위한 비례적분제어기의 도입 및 튜닝)

  • Ko, Dong-Wook;Kim, Jung-Woo;Chun, Yeong-Han
    • Proceedings of the KIEE Conference
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    • 2006.07a
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    • pp.288-289
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    • 2006
  • Conventional AGC controller implemented by considering ACE and bias factors always contains error terms due to inaccuracy of bias factors. To improve this steady state AGC performance, PI controller can be introduced to the ACE processing and plant controller part. Even though more rigorous inspections are required, a simple application shows that it can be very useful for the improvements of AGC performances.

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Feasibility and Safety of Totally Laparoscopic Radical Gastrectomy for Advanced Gastric Cancer: Comparison with Early Gastric Cancer

  • Lee, Seungyeob;Lee, Hayemin;Lee, Junhyun
    • Journal of Gastric Cancer
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    • v.18 no.2
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    • pp.152-160
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    • 2018
  • Purpose: Totally laparoscopic gastrectomy (TLG) for advanced gastric cancer (AGC) is a technically and oncologically challenging procedure for surgeons. This study aimed to compare the oncologic feasibility and technical safety of TLG for AGC versus early gastric cancer (EGC). Materials and Methods: Between 2011 and 2016, 535 patients (EGC, 375; AGC, 160) underwent curative TLG for gastric cancer. Clinicopathologic characteristics and surgical outcomes of both patient groups were analyzed and compared. Results: Patients with AGC required a longer operation time and experienced more intraoperative blood loss than those with EGC did. However, patients from both the AGC and EGC groups demonstrated similar short-term surgical outcomes such as postoperative morbidity (14.4% vs. 13.3%, P=0.626), mortality (0% vs. 0.5%, P=0.879), time-to-first oral intake (2.7 days for both groups, P=0.830), and postoperative hospital stay (10.2 days vs. 10.1 days, P=0.886). D2 lymph node dissection could be achieved in the AGC group (95%), with an adequate number of lymph nodes being dissected ($36.0{\pm}14.9$). In the AGC group, the 3-year overall and disease-free survival rates were 80.5% and 73.7%, respectively. Conclusions: TLG is as safe and effective for AGC as it is for EGC.

High-grade Cervical Histopathology in Women with Atypical Glandular Cell Cytology

  • Watcharanon, Waranya;Luanratanakorn, Sanguanchoke;Kleebkaow, Pilaiwan;Chumworathayi, Bandit;Temtanakitpaisan, Amornrat;Kietpeerakool, Chumnan
    • Asian Pacific Journal of Cancer Prevention
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    • v.17 no.1
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    • pp.135-138
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    • 2016
  • This study was undertaken to evaluate the prevalence of underlying significant lesions among women referred for colposcopy after atypical glandular cell (AGC) smears and the associated risks. The present study reviewed data from women with AGC smears undergoing colposcopy at the Colposcopy Clinic, Faculty of Medicine, Khon Kaen University, Thailand between January 2001 to December 2014. Significant lesions included cervical intraepithelial neoplasia grade 2-3, adenocarcinoma in situ, endometrial hyperplasia, and cancer. During the study period, 170 women with AGC cytology were reviewed. The mean age was 45.7 years. Thirty-eight women (22.4%) were postmenopausal. Eighteen smears (10.6%) were further subclassified as AGC-favor neoplasia (AGC-FN). In total, significant lesions were noted in 27 women (15.9%; 95%CI, 7.8%-18.3%). Thirteen women (7.6%, 95%CI, 4.1%-12.7%) were found to have cervical cancer or endometrial cancer. Two variables were independently associated with an increased risk of significant histopathology results: level of educational attainment (secondary level or lower versus bachelor degree or higher) and types of AGC (AGC versus AGC-FN). Women who had low level of education and those with AGC-FN were at the higher risk of significant lesions (OR, 3.16; 95%CI 1.10-9.11 and OR, 4.62; 95%CI, 1.54-13.85, respectively). In conclusion, the rate of significant lesions among women referred for colposcopy after AGC smears is considerably high. Low education and smear subtypes appear independently associated with a higher risk of significant lesions.

Two-stage Adaptive Digital AGC Method for SDR Radio (SDR 통신장비를 위한 2단계 적응형 Digital AGC 기법)

  • Park, Jong-Hun;Kim, Young-Je;Cho, Jung-Il;Cho, Hyung-Weon;Lee, Young-Po;Yoon, Seok-Ho
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.37 no.6C
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    • pp.462-468
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    • 2012
  • In this paper, an adaptive digital automatic gain control(AGC) algorithm with two stages is proposed. AGC technique is crucial for mobile communication equipment because path loss in wireless channel and gain fluctuation in receiver front-end continuously change the received signal strength. Furthermore, adaptive criteria should be applied to the design of AGC algorithm in order to support many waveforms with one SDR communication device. With these reasons, a two-stage structure is proposed to satisfy both flexibility and adaptiveness. Compared with conventional method, it also requires shorter convergence time. Numerical results show that the gain value of variable gain amplifier(VGA) is converged within proper time and proposed scheme controls the input level of analog to digital converter(ADC) to be stable during long range of time.

A Study on the Hydraulic Automatic Gauge Control System of Adaptive Mass Flow Method (Adaptive mass flow method 유압압하식 자동 두께제어 장치에 관한 연구)

  • 윤순현;김문경
    • Journal of Advanced Marine Engineering and Technology
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    • v.20 no.4
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    • pp.101-107
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    • 1996
  • This test was performed on the hydraulic automatic gauge control(AGC) system of adaptive mass flow method. Fundamental purpose of this study are performance evaluation of this AGC system under the actual rolling condition. It was concluded that the response of AGC system depends on the dynamic characteristics of a reel motor or roll position. The test results are as follows : 1) The control method of reel motor current is better than than of the roll position as AGC system. 2) The more steel strip thickness of delivery side is thick, the larger the gauge deviation is large, and the more it is thin, the larger the gauge deviation rate is large. 3) Because the gauge deviation is large at acceleration and deceleration speed than steady speed, so AGC system is better to adopt over 50m/min. By applying this AGC system, not only the accurary in strip thickness were improved but also productivity was improved dramatically.

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A Joint Scheme of AGC and Gain/Phase Mismatch Compensation for QPSK DCR

  • Song, Yun-Jeong;Lee, Ho-Jin;Ra, Sung-Woong;Kim, Young-Wan
    • ETRI Journal
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    • v.26 no.5
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    • pp.501-504
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    • 2004
  • This paper presents a simple gain/phase blind compensation algorithm with an automatic gain control (AGC) function for the adoption of the AGC function and compensation for gain/phase imbalances in quadrature phase shift keying (QPSK) direct conversion receivers (DCRs). The AGC function is interactively operated with the compensation algorithm for gain/phase imbalances. By detecting the gain sum and difference values between the I-channel and Q-channel, the combined AGC and gain imbalance compensation algorithm provides a simpler DCR architecture.

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Performance Analysis of AGC Applebaum Array for Multiple Narrowband Interference (다중의 협대역 간섭 신호에 대한 AGC Applebaum어레이의 성능 분석)

  • 윤동현;이규만;한동석
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.25 no.6B
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    • pp.1092-1099
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    • 2000
  • An adaptive array system can effectively remove all received interferences by using adaptive algorithms even though the received signal condition is not known. The conventional adaptive array systems, however, cannot remove all interferences adaptively and converge very slowly when the eigenvalue spread of the input covariance matrix is large. In the paper, a new adaptive array system called an automatic gain controller (AGC) Applebaum array and its control algorithm are proposed to overcome the performance degradation of conventional Applebaum array in multiple interference conditions. The performance analysis of the proposed AGC Applebaum array is described under the condition of multiple narrowband interferences. Simulation results show the array output signal-to-noise ratio (SNR) of the AGC Applebaum array increases by 30dB compared to that of the conventional Applebaum array in the simulation condition. The gain of the AGC Applebaum array in the incident direction of a weaker interference is also shown to be lower than that of the conventional Applebaum array.

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Characteristics of Frequency Control by Governor and AGC (AGC와 Governor의 주파수 제어 특성)

  • Choi Seung Ho;Jung Yun Jae;Baeck Wong Ki;Chun Yeong Han
    • Proceedings of the KIEE Conference
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    • summer
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    • pp.60-63
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    • 2004
  • AGC is widely used to regulate the frequency of power systems. It is also used to control the frequency of Korean Power System. Control strategies depends on systems to which it is applied. Korean Power System consists of one control area and it has no tie-line. In this research, we have developed a simulation tool to confirm AGC dynamics. The developed tool has been verified by two-machine three-bus system. Moreover an AGC control strategy has been suggested to avoid contradiction with governor dynamics. Low pass filter with relatively long time constant showed good regulation performance. This simple strategy is expected to be applied to New EMS in KPX to get reasonable AGC regulation performance.

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A Digital Automatic Gain Control Circuit for CMOS CCD Camera Interfaces (CMOS CCD 카메라용 디지털 자동 이득 제어 회로)

  • 이진국;차유진;이승훈
    • Journal of the Korean Institute of Telematics and Electronics C
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    • v.36C no.5
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    • pp.48-55
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    • 1999
  • This paper describes automatic gain control circuit (AGC) design techniques for CMOS CCD camera interface systems. The required gain of the AGC in the proposed system is controlled directly by digital bits without conventional extra D/A converters and the signal settling behavior is almost independent of AGC gain variation at video speeds. A capacitor-segment combination technique to obtain large capacitance values considerably improves the effective bandwidth of the AGC based on switched-capacitor techniques. A proposed layout scheme for capacitor implementation shows AGC matching accuracy better than 0.1 %. The outputs from the AGC are transferred to a 10b A/D converter integrated on the same chip. The proposed AGC is implemented as a sub-block of a CCD camera interface system using a 0.5 um n-well CMOS process. The prototype shows the 32-dB AGC dynamic range in 1/8-dB steps with 173 mW at 3 V and 25 MHz.

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Gastroprotective Effect of the Three Glucuronopyranoside Flavonoids in Rats

  • Im, Wi Joon;Nam, Yoonjin;Park, Sun Young;Sohn, Uy Dong
    • The Korean Journal of Physiology and Pharmacology
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    • v.17 no.5
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    • pp.411-415
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    • 2013
  • In this study, we investigated the protective action of glucuronopyranoside flavonoids (QGC, AGC, LGC) on gastritis in rats. QGC, AGC and omeprazole decreased the gastric volume significantly, and each $ID_{50}$ was 0.75, 0.54 and 8.5 mg/kg, respectively, thus the order of potency was AGC, QGC and omeprazole. They also decreased acid output, and each $ID_{50}$ was 7.81, 0.58 and 6.71 mg/kg, respectively, thus the order of potency was AGC, omeprazole and QGC. They inhibited gastritis induced by indomethacin, and it recovered significantly by increasing the GSH levels in gastritis. The gastric MPO activity in the gastritis group increased more than in the normal group. QGC, LGC, or AGC administration reduced moderately the MPO activity in a dose-dependent manner. This study demonstrated that AGC, QGC, or LGC showed potent efficacy on the gastritis, by preventing oxidative stress. These results suggest that QGC, AGC, or LGC have gastroprotective effect in rats.