• Title/Summary/Keyword: HPF

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The Clinical Study on Chronic Prostatitis and Sexual Dysfunction (만성전립선염과 성기능장애에 대한 임상적 고찰)

  • Cho Chung Sik
    • Journal of Physiology & Pathology in Korean Medicine
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    • v.16 no.6
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    • pp.1164-1169
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    • 2002
  • The purpose of this study was to examine the correlation of chronic prostatitis with sexual dysfunction and WBC counts on expressed prostatic secretion(EPS) with symptoms of sexual dysfunction. From 2001. 9. 1 to 2002. 3. 31, chronic prostatitis patients(30 examples) treated for more than 4 weeks were compared with normal group(30 examples) about hypoactive sexual desire disorder, erectile dysfunction, orgasmic disorder and hematospermia. We investigated sexual dysfunction according to the degree of prostatitis, improvement rate of prostatitis and sexual dysfunction. Chronic prostatitis patients compared with normal group were increased significantly in decreased libido(73.3%), erectile dysfunction(51.1%), orgasmic disorder(48.7%) and hematospermia(16.7%). In WBC very many/HPF group compared with others. though sexual dysfunction was highly revealed, but there was no statistic significance. In improvement rate of prostatitis, total improvement rate was 76.7%, WBC 10-30/HPF group 77.8%, WBC many/HPF group 72.8% and WBC very many/HPF group 80%. But the medical cure effect was the highest in WBC 10-30/HPF group. In the improvement rate of sexual dysfunction, total improvement rate was 68.5%, hematospermia 100%, decreased libido 90.9%, erectile dysfunction 67.4% and orgasmic disorder 60.3%. As a result of considering the relation with improvement rate of prostatitis and sexual dysfunction, there was a statistical significance at the erectile dysfunction. orgasmic disorder. The results showed the chronic prostatitis had effects on sexual dysfunction but there was no correlation between the degree of chronic prostatitis with sexual dysfunction. It also showed that the treatment of prostatitis had effects on improvements of erectile dysfunction and orgasmic disorder.

Comparative Analysis of LPF and HPF for Roads Edge Detection from High Resolution Satellite Imagery (고해상도위성영상에서 도로 경계 검출을 위한 고주파와 저주파 필터링 비교분석에 관한 연구)

  • Choi, Hyun;Kang, In-Joon
    • Journal of Korean Society for Geospatial Information Science
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    • v.14 no.3 s.37
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    • pp.3-11
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    • 2006
  • The need for edge detection about topography data from the high resolution satellite imagery is happening with increasing frequency according to many people utilize the its imagery as various fields recently. Many experts is recognizing of other GIS will make use of the road detection from the high resolution satellite imagery, including ITS (Intelligent Transportation Systems) and urban planning. This paper is comparative analysis of LPF (Low Pass Filtering) and HPF (High Pass Filtering) for roads edge detection from high resolution satellite imagery. As a result, LPF and HPF can be highlight selective pixels at edge area about input data. In case or applying to other techniques such as LPF for the same purpose, they aye more effective for wide road width which often cause the slight distortion of boundary or overall change of brightness values on the whole Image. Whereas, HPF has ability to enhance selectively detailed components in a target image.

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Noise Reduction Method in consideration of bandwidth of Low Pass Filter (저역통과 필터의 대역폭을 고려한 잡음 제거 방법)

  • Yang, Jeong-Ju;Jang, Won-Woo;Kwak, Boo-Dong;Kang, Bong-Soon
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2010.05a
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    • pp.157-159
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    • 2010
  • Most digital cameras apply a Charge Coupled Device(CCD) Sensor or a Complementary Metal Oxide Semiconductor(COMS) Sensor. And the images captured these sensors include unwanted noises. In this paper, we proposed a method of the Noise Reduction(NR) about noise reduction or recovery in the image. The proposed NR method is related to Bandwidth of the Low Pass Filter(LPF). For improvement of NR, we were changing the filter coefficient of the LPF. The results of simulations with various filter coefficients, [1 2 1] in the LPF and [-1 2 -1] in the High Pass Filter(HPF) have ideal frequency bandwidth and high performance. We proposed a filter coefficient [1 2 1] and [-1 2 -1] in the LPF and the HPF respectively.

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Comparison and Study of Active and Hybrid Power Filters for Compensation of Grid Harmonics

  • Gutierrez, Bryan;Kwak, Sang-Shin
    • Journal of Power Electronics
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    • v.16 no.4
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    • pp.1541-1550
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    • 2016
  • This paper presents a theoretical analysis and comparisons of active power filter (APF) and hybrid power filter (HPF) systems, given terminal constraints of harmonic compensations in nonlinear loads. Despite numerous publications for the two types of filters, the features and differences between them have not been clearly explained. This paper presents a detailed analysis of the operations of a HPF inverter along with those of passive power filters (PPFs). It also includes their effects on the power factor at the grid. In addition, a theoretical analysis and a systematic comparison between the APF and HPF systems are addressed based on system parameters such as the source voltage, output power, reactive component size, and power factor at the grid terminals. The converter kVA ratings and dc-link voltage requirements for both topologies are considered in the presented comparisons

New Design Approach for Grid-Current-Based Active Damping of LCL Filter Resonance in Grid-Connected Converters

  • Gaafar, Mahmoud A.;Dousoky, Gamal M.;Ahmed, Emad M.;Shoyama, Masahito;Orabi, Mohamed
    • Journal of Power Electronics
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    • v.18 no.4
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    • pp.1165-1177
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    • 2018
  • This paper investigates the active damping of grid-connected LCL filter resonance using high-pass filter (HPF) of the grid current. An expression for such HPF is derived in terms of the filter components. This expression facilitates a general study of the actively damped filter behavior in the discrete time domain. Limits for the HPF parameters are derived to avoid the excitation of unstable open loop poles since such excitation can reduce both the damping performance and the system robustness. Based on this study, straightforward co-design steps for the active damping loop along with the fundamental current regulator are proposed. A numerical example along with simulation and experimental results are presented to verify the theoretical analyses.

Electronical Properties On Coupling Capacitor of PLC (전력선 통신의 결합 캐피시터의 전기적 특성)

  • Kim, Byoung-Ho;Lee, Hun-Yong;Kim, Jee-Gyun;Kim, Yu-Kyong;Choi, Yong-Ho;Park, Gwi-Nam
    • Proceedings of the KIEE Conference
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    • 2002.07c
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    • pp.1530-1532
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    • 2002
  • 전력선 통신 시스템을 간략히 살펴보면 송전단과 수전단으로 나누어 볼 수 있다. 송전단은 전력을 송전하기 위한 설비와 신호를 싣고 분리하는 결합회로로 구성되며 수전단은 수전설비와 결합회로로 분리된다. 결합회로는 $BaTiO_3$를 주성분으로 하는 고유전율 및 대용량의 캐패시터로 구성되었다. 이 캐패시터를 변압기 외부에 사용하므로, 직사광선에 의한 온도 변화가 생길 것이며 이 변화에 따라 캐패시턴스 값의 변화가 생길 것이므로 HPF로 사용할 때 캐패시턴스 값의 변화로 주파수에 영향을 줄 것이다. 주위온도에 따른 캐패시턴스의 변화가 HPF의 동작에 어떠한 영향을 미치는지 고찰하고자한다. 이에 본 연구에서는 수전단의 10KV이하 배전 선로에 사용되는 Coupling Capacitor의 외부온도를 변화시켜 전기적 특성의 변화를 고찰함으로서, HPF로서의 사용될수 있는지 확인하고자 한다.

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Structures and Characteristics of the WDF Using VGIC for VLSI Implementation (전압변환 GIC에 의한 WDF의 VLSI 실현에 적합한 구조 및 특성)

  • 박종연;손태호
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.17 no.10
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    • pp.1081-1091
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    • 1992
  • A new method for designing of WDF(Wave Digital Filter) is proposed, which is based on the digital dependent port adaptor transformed by the VGIC(Voltage Conversion Generalized Impedance Converter). To design the WD-LPF, WD-BPF, WD-HPF, or WD-BRF with CGIC(Current Conversion GIC). we have to use the different structure respectively. But the proposed method to design any types of WDF requires only one universal WDF structure, and this structure is attractive for its VLSI implementation for its simplicity.

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Effects of high pass filter settings on P300 waveform (고역통과필터 값이 P300의 파형에 미치는 영향)

  • Eom, Jin-Sup;Eum, Young-Ji;Sohn, Jin-Hun;Park, Kwang-Bai
    • Science of Emotion and Sensibility
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    • v.13 no.1
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    • pp.179-186
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    • 2010
  • The present study is a partial extension of the Duncan-Johnson and Donchin (1979) and Soskins, Rosenfeld, and Niendam (2001) studies that found some effects of high pass filter (HPF) setting on P300 waveform. EEGs were recorded while the subjects performed a visual three-stimulus oddball task, and the Fz and Pz EEG signals were passed through 0.01 Hz, 0.3 Hz, and 1.0 Hz HPFs. P300 amplitudes at Fz and Pz were reduced at 1.0 Hz HPF compared to 0.01 Hz and 0.3 Hz HPFs. The negative peaks post P300 at Fz and Pz were not observed at 0.01 Hz HPF, but observed at 0.3 Hz and 1.0 Hz HPFs. The combination of 0.3 Hz HPF and peak-to-peak P300 measures was more useful than that of 0.01 Hz, 0.3 Hz, or 1.0 Hz HPF and baseline-to-peak P300 measures to discriminate between non-target and standard stimuli. The peak-to-peak P300 measures were more useful than the baseline-topeak P300 measures at 1.0 Hz HPF setting.

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Comparison of Atmospheric Environmental Factors between Farms with Difference in Paprika Productivity (파프리카 생산성 차이 농가 간 지상부 환경요인 비교)

  • Kim, Ga Yeong;Woo, Seung Mi;Kim, Ho Cheol
    • The Journal of the Convergence on Culture Technology
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    • v.7 no.4
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    • pp.785-789
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    • 2021
  • Paprika productivity is different even in the same quality greenhouse and in the same region. These differences are known to due to differences in various environmental factors. This study was conducted to investigate the difference in the level of various environmental factors between high-productivity (HPF) and low-productivity (LPF) greenhouses. The largest difference between the two greenhouses in the daily or weekly average values of major environmental factors was the CO2 concentration, but the LPF was higher than the HPF, so it was not determined as a factor for the difference in productivity. Correlation analysis among 14 environmental factors showed a high correlation among irradiation or related factors in moisture. The regression coefficients of the linear regression model between vapor pressure deficit and relative humidity were -0.0202kpa in HPF and -0.0262kpa in LPF. In particular, in February and March, the vapor pressure deficit in LPF was 1.5kpa or more, and the cumulative vapor pressure deficit compared to the cumulative irradiation at the early period of cultivation increased rapidly. The reason for the low productivity in LPF is thought to be that the plant was affected by moisture stress due to high vapor pressure deficit and transpiration under low irradiation conditions in the early period of cultivation and in winter.

Research About Filter Association and Clinical Effect Noise Reduction of Digital Medical Imaging System (디지털 의료영상에서 Noise감소를 위한 필터조합과 임상적 효과에 관한 연구)

  • Min, Jung-Whan;Kim, Jung-Min;Jeong, Hea-Won;Ok, Chi-Il
    • Journal of radiological science and technology
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    • v.30 no.4
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    • pp.329-334
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    • 2007
  • This paper is for investigation of the noise reduction effect all 20 filters by combining Low Pass Filter(LPF) 5 kinds, High Pass Filter(HPF) 4 kinds, Median Filter(MF) 11 kinds. Noise is added to reduce noise and minimize the quality degradation in medical imaging system. We also compared Peak Signal to Noise Ratio(PSNR), Mean Square Error(MSE) for all the combinations of different filters. As a result, noise decrease appeared in the LPF3*3#1 + HPF3*3#1 + Vertical3*1 of highest filter. We confirmed noise reduction effect by applying the proposed filter combination in many fields of medical imaging applications.

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