• 제목/요약/키워드: power matching

검색결과 755건 처리시간 0.029초

파워마스크를 이용한 영상 핑거프린트 정합 성능 개선 (Improving Image Fingerprint Matching Accuracy Based on a Power Mask)

  • 서진수
    • 한국멀티미디어학회논문지
    • /
    • 제23권1호
    • /
    • pp.8-14
    • /
    • 2020
  • For a reliable fingerprinting system, improving fingerprint matching accuracy is crucial. In this paper, we try to improve a binary image fingerprint matching performance by utilizing auxiliary information, power mask, which is obtained while constructing fingerprint DB. The power mask is an expected robustness of each fingerprint bit. A caveat of the power mask is the increased storage cost of the fingerprint DB. This paper mitigates the problem by reducing the size of the power mask utilizing spatial correlation of an image. Experiments on a publicly-available image dataset confirmed that the power mask is effective in improving fingerprint matching accuracy.

파워 가중치를 이용한 오디오 핑거프린트 정합 (Audio fingerprint matching based on a power weight)

  • 서진수;김정현;김혜미
    • 한국음향학회지
    • /
    • 제38권6호
    • /
    • pp.716-723
    • /
    • 2019
  • 음악 검색을 서비스하기 위해서는 핑거프린트 정합 정확도가 중요하다. 본 논문에서는 파워 가중치를 이용하여 오디오 핑거프린트 정합 성능을 제고하고자 한다. 파워 가중치는 핑거프린트 비트 추출 과정에서 유실되는 정보를 이용하여 구한 핑거프린트 비트의 예측 강인도이다. 기존 파워 마스크 방법은 저장 공간을 줄이기 위해서 이진화를 통해서 강인한 비트와 연약한 비트로 나눈다. 본 논문에서는 정합 성능을 향상시키기 위해서 실수 값 형태의 파워 가중치를 사용하는 방법을 제안한다. 또한 시간축 방향으로 연관성이 강한 파워 가중치의 특성을 이용하여 압축하여 저장공간을 줄일 수 있도록 한다. 공개된 음악 데이터셋에서 실험을 수행하여, 제안된 파워 웨이트가 오디오 핑거프린트 정합성능을 제고함을 확인하였다.

3dB coupled line을 이용한 안정한 RF전력증폭기 설계방법 (Design method of stable RF power amplifiers using 3dB coupled line)

  • 김선욱;강원태;강충구;장익수
    • 전자공학회논문지D
    • /
    • 제34D권10호
    • /
    • pp.24-31
    • /
    • 1997
  • A new design method of stable RF power amplifier using 3dB coupled line is proposed in this thiesis. The proposed method of broadband matching consist of resistive matching circuits at low frequency and lossless matching circuits at microwave band. This design method increase the stability of an amplifier and is suitable for interstage matching. When high power amplifier is designed using this method for PCS base transceiver station, the measured resutls show thst the gain of 18.5dB, and 9W (39.5dBm) output power. We use motorola's MRF6401 for medium power and MRF 6402 for large power and cascaded them.

  • PDF

다양한 매칭 회로들을 활용한 저잡음 증폭기 설계 연구 (Design of Low Noise Amplifier Utilizing Input and Inter Stage Matching Circuits)

  • Jo, Sung-Hun
    • 한국정보통신학회논문지
    • /
    • 제25권6호
    • /
    • pp.853-856
    • /
    • 2021
  • In this paper, a low noise amplifier having high gain and low noise by using input and inter stage matching circuits has been designed. A current-reused two-stage common-source topology is adopted, which can obtain high gain and low power consumption. Deterioration of noise characteristics according to the source inductive degeneration matching is compensated by adopting additional matching circuits. Moreover trade-offs among noise, gain, linearity, impedance matching, and power dissipation have been considered. In this design, 0.18-mm CMOS process is employed for the simulation. The simulated results show that the designed low noise amplifier can provide high power gain and low noise characteristics.

Understanding of RF Impedance Matching System Using VI-Probe

  • Lee, Ji Ha;Park, Hyun Keun;Lee, Jungsoo;Hong, Snag Jeen
    • 반도체디스플레이기술학회지
    • /
    • 제19권3호
    • /
    • pp.43-48
    • /
    • 2020
  • The demand for stable plasma has been on the rise because of the increased delivery power amount in the chamber for improving productivity, and fast and accurate plasma impedance matching become a crucial performance measure for radio frequency (RF) power system in semiconductor manufacturing equipment. In this paper, the overall impedance matching was understood, and voltage and current values were extracted with voltage - current (VI) probe to measure plasma impedance in real-time. Actual matching data were analyzed to derive calibration coefficient for V and I measurements to understand the characteristics of VI probe, and we demonstrated the tendency of RF impedance matching according to changes in load impedance. This preliminary empirical research can contribute to fast RF matching as well as advanced equipment control for the next level of detailed investigation on embedded system based-RF matching controller.

Schottky 다이오드를 이용한 Six-port용 L/Ku-band 광대역 Power detector 설계 제작 (Design and Implementation of L/Ku-band Broadband Power Detector using Schottky Diode)

  • 김영완
    • 한국정보통신학회:학술대회논문집
    • /
    • 한국해양정보통신학회 2006년도 춘계종합학술대회
    • /
    • pp.615-618
    • /
    • 2006
  • 본 논문에서는 직접 변환 방식인 six-port의 RF 출력 신호를 검파하고 요구 대역폭에서 입력 주파수 신호에 대한 진폭 및 위상차를 선형적으로 출력하는 광역 power detector를 설계 제작한다. Six-port 출력단에 접속되는 power detector는 높은 정합도를 갖고 반사파로 인한 Six-port 간 위상 불일치를 방지하고, 넓은 대역폭에서 낮은 VSWR을 유지하여야 하는 광역 특성을 갖는 power detector 설계가 필요하다. L-band의 강제 정합 회로와 Ku-band의 정합 회로 그리고 isolator와 정합 회로를 갖는 power detector 회로를 구성하여 요구하는 Six-port 형 power detector 성능을 평가한다.

  • PDF

선로 조류 유지 기법에 근거한 계통축약 및 다변수 제어기법 적용 연구 (A study on application of aggregation method based on power flow matching technique and multi-variable control method to the power system)

  • 이병하;오민혁;백정명
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 2006년도 추계학술대회 논문집 전력기술부문
    • /
    • pp.342-344
    • /
    • 2006
  • The modem enormous electric power system has made power system analysis much more complex and difficult. For effective analysis of the power system, model reduction and aggregation is required. In this paper, a new aggregation method is presented to aggregate the coherent generators in the large scale power system while matching the power flow. In order to demonstrate the effects of this aggregation method, it is applied to a small scale power system. A multi-variable control technique of $H_{\infty}$ control is also applied to enhance the dynamic stability of the aggregated power system.

  • PDF

질소 플라즈마의 임피이던스 특성 및 정합회로 설계 (Impedance Characteristics of N2 Plasma and Matching Circuit Design)

  • 황기웅;김원규
    • 대한전기학회논문지
    • /
    • 제35권12호
    • /
    • pp.560-566
    • /
    • 1986
  • In the design of an RF discharge system, the electrical equivalence of the gas discharge must be known. With this knowledge, one can design a suitable matching network for a maximum power transfer from the RF generator into the discharge. For this purpose, an experiment has been conducted in which the electrical impedance (conductance and capacitance) was determined as a function of power. In parallel with this, a detailed theoretical analysis has been done and the results are in accord with those of our experiment. Design equations are also given for a simple matching network, and a design example is presented to demonstrate its application. During the actual operation of an RF discharge system, however, it has been often observed that the reflected power tends to vary in small values due to the changes in the impedance of the system. This problem can be relieved by adding an automatic impedance matching circuit to the system and this paper presents such an automatic impedance matching network.

  • PDF

A Novel Impedance Matching Topology for Magnetically Coupled Wireless Power Transfer

  • Lee, Gunbok;Park, Wee Sang
    • International journal of advanced smart convergence
    • /
    • 제1권2호
    • /
    • pp.16-19
    • /
    • 2012
  • A modified 4-coil magnetic resonance wireless power transfer (MRWPT) system is proposed. Four coils based on 2-coil system with additional two matching coils were used in this topology. When Tx-Rx distance is changed, the input impedance is changed. However, it can be adjusted by coil parameters of matching coils to maintain impedance matching for maximum efficiency. The equivalent circuit of MRWPT system was analyzed for both transmission function and optimum coupling coefficient of the matching coils. By using four spiral resonant coils, these design considerations was experimentally verified. The measured data agreed well with the calculated data and the transmission function of the proposed system was more efficient than that of conventional 2-coil system.

A Novel Online Multi-section Weighed Fault Matching and Detecting Algorithm Based on Wide-area Information

  • Tong, Xiaoyang;Lian, Wenchao;Wang, Hongbin
    • Journal of Electrical Engineering and Technology
    • /
    • 제12권6호
    • /
    • pp.2118-2126
    • /
    • 2017
  • The large-scale power system blackouts have indicated that conventional protection relays that based on local signals cannot fit for modern power grids with complicated setting or heavily loaded-flow transfer. In order to accurately detect various faulted lines and improve the fault-tolerance of wide-area protection, a novel multi-section weighed fault matching and detecting algorithm is proposed. The real protection vector (RPV) and expected section protection vectors (ESPVs) for five fault sections are constructed respectively. The function of multi-section weighed fault matching is established to calculate the section fault matching degrees between RPV and five ESPVs. Then the fault degree of protected line based on five section fault degrees can be obtained. Two fault detecting criterions are given to support the higher accuracy rate of detecting fault. With the enumerating method, the simulation tests illustrate the correctness and fault-tolerance of proposed algorithm. It can reach the target of 100% accuracy rate under 5 bits error of wide-area protections. The influence factors of fault-tolerance are analyzed, which include the choosing of wide-area protections, as well as the topological structures of power grid and fault threshold.