• Title/Summary/Keyword: Resonance Type

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Implementation of the Classification using Neural Network in Diagnosis of Liver Cirrhosis (간 경변 진단시 신경망을 이용한 분류기 구현)

  • Park, Byung-Rae
    • Journal of Intelligence and Information Systems
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    • v.11 no.1
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    • pp.17-33
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    • 2005
  • This paper presents the proposed a classifier of liver cirrhotic step using MR(magnetic resonance) imaging and hierarchical neural network. The data sets for classification of each stage, which were normal, 1type, 2type and 3type, were analysis in the number of data was 231. We extracted liver region and nodule region from T1-weight MR liver image. Then objective interpretation classifier of liver cirrhotic steps. Liver cirrhosis classifier implemented using hierarchical neural network which gray-level analysis and texture feature descriptors to distinguish normal liver and 3 types of liver cirrhosis. Then proposed Neural network classifier learned through error back-propagation algorithm. A classifying result shows that recognition rate of normal is $100\%$, 1type is $82.8\%$, 2type is $87.1\%$, 3type is $84.2\%$. The recognition ratio very high, when compared between the result of obtained quantified data to that of doctors decision data and neural network classifier value. If enough data is offered and other parameter is considered this paper according to we expected that neural network as well as human experts and could be useful as clinical decision support tool for liver cirrhosis patients.

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Generating Characteristics of EYE-type Piezoelectric-generator Using Tension (장력을 이용한 EYE-type 압전 발전기의 출력 특성)

  • Ha, Yong Woo;Jeong, Sung Su;Kim, Na Lee;Kim, Myong Ho;Kang, Shin Chul;Park, Tae Gone
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.26 no.8
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    • pp.635-639
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    • 2013
  • Generating output characteristics of a EYE-type piezoelectric generator depending on ceramic size and materials of the elastic body were studied. EYE-type piezoelectric-generating device consist of the ceramic was attached between the both elastic body. piezoelectric-generating is that if the tension occurred at both ends of an elastic body, the piezoelectric effect occurs at ceramics through the form change of the elastic body. The structure of this EYE-type generator use various area. than a existing type generator, because the ceramic position of the directly force at does not apply. Resonance and output characteristics of the generator were analyzed by using FEM program. Generators were fabricated on the basis of analyzed results and attached on a frequency controllable vibrator to measure output characteristics. Also, the experimental results were compared with the simulated results. As a result, output characteristics of the generator increased depending on the increase in ceramic thickness. In case of increase in ceramic width, resonance frequency of the generator also decreased.

The Development of Buck Type Electronic Ballast for 250W MHL and Dimming System (250W MHL용 Buck Type 전자식 안정기 및 Dimming 시스템 개발)

  • 박종연;박영길;정동열;김한수
    • The Transactions of the Korean Institute of Power Electronics
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    • v.7 no.1
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    • pp.30-40
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    • 2002
  • This paper studies the electronic ballast development for 250w MH lamps. We have improved the input power factor using a PFC IC. To provide the rating voltage required In the lamps, we have used the buck type dc-dc converter By this method, the stress of switching devices in inverter can be reduced. The inverter is the Full-Bridge type. To eliminate the acoustic resonance phenomena of MH lamps, we have added the high frequency sinewave voltage to the low frequency square-wave voltage to the lamp. We hove developed the igniter circuit using the L, C devices. We could control dimming of the lamp by varying the output voltage of the buck converter. The time of illuminating lamps and luminous intensity could be adjusted by season and time band. The buck converter output voltage can be controlled and the no load and over current situation were Protected by the development of the microprocessor Program.

Classification of Fall in Sick Times of Liver Cirrhosis using Magnetic Resonance Image (자기공명영상을 이용한 간경변 단계별 분류에 관한 연구)

  • Park, Byung-Rae;Jeon, Gye-Rok
    • Journal of radiological science and technology
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    • v.26 no.1
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    • pp.71-82
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    • 2003
  • In this paper, I proposed a classifier of liver cirrhotic step using T1-weighted MRI(magnetic resonance imaging) and hierarchical neural network. The data sets for classification of each stage, which were normal, 1type, 2type and 3type, were obtained in Pusan National University Hospital from June 2001 to december 2001. And the number of data was 46. We extracted liver region and nodule region from T1-weighted MR liver image. Then objective interpretation classifier of liver cirrhotic steps in T1-weighted MR liver images. Liver cirrhosis classifier implemented using hierarchical neural network which gray-level analysis and texture feature descriptors to distinguish normal liver and 3 types of liver cirrhosis. Then proposed Neural network classifier teamed through error back-propagation algorithm. A classifying result shows that recognition rate of normal is 100%, 1type is 82.3%, 2type is 86.7%, 3type is 83.7%. The recognition ratio very high, when compared between the result of obtained quantified data to that of doctors decision data and neural network classifier value. If enough data is offered and other parameter is considered, this paper according to we expected that neural network as well as human experts and could be useful as clinical decision support tool for liver cirrhosis patients.

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Acoustic Properties of Ultrasonic Transducer Using Piezocomposites (압전복합재료를 이용한 초음파 트랜스듀서의 음향 특성)

  • Lee, Sang-Wook;Ryu, Jeong-Tag;Nam, Hyo-Duk;Kim, Yeon-Bo
    • The Journal of the Acoustical Society of Korea
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    • v.26 no.2
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    • pp.80-86
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    • 2007
  • We have investigated on the development of 2-2 type piezocomposites that have better piezoelectric activity and lower acoustic impedance than those of conventional piezoceramics. In this study, we have investigated the piezoelectric and acoustic properties of 2-2 type piezocomposites sensor which was fabricated using dice-and-fill technique for the different volume fraction of PZT. The specific acoustic impedance of 2-2 type piezocomposites decreased linearly when PZT volume fraction was decreased. The resonance characteristics measured by an impedance analyzer(HP4194A) were similar to the analysis of finite element method (FEM). The resonance characteristics and the electromechanical coupling factor were the best when the volume fraction PZT was 0.6. It also showed the highest result from the standpoint of sensitivity, bandwidth and ring-down property and so on at the same condition. The specific characteristics show that the 2-2 type piezocomposites turned out to be superior to the ultrasonic sensor composed by single phase PZT.

A Study on Acceleration of High-Speed Railway Bridges According to Type of Track (고속철도교량의 도상 종류에 따른 가속도 비교)

  • Yoon, Hye-Jin;Chin, Won-Jong;Choi, Eun-Suk;Kang, Jae-Yoon;Kwark, Jong-Won;Kim, Byung-Suk
    • Proceedings of the KSR Conference
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    • 2011.10a
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    • pp.849-852
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    • 2011
  • Dynamic response of high-speed railway bridges is important due to the possibility of resonance from continuous and repeated action of high-speed train running. Acceleration of bridge deck is important parameter in the evaluation of dynamic stability of bridges. This study investigated acceleration characteristics according to type of tracks.

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Novel Oscillator Incorporating a Compact Microstrip Ring Type Resonant Cell with High Efficiency and Superior Harmonic Characteristics

  • Hwang Cheol-Gyu;Myung Noh-Hoon
    • Journal of electromagnetic engineering and science
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    • v.5 no.2
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    • pp.92-96
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    • 2005
  • This paper presents a novel microwave oscillator incorporating a simple microstrip ring type resonant cell as its terminating resonance component. Reduced chip size, higher dc-ac power efficiency, superior harmonic characteristics can be achieved from the introduction of a compact microstrip ring resonator cell. The oscillator provides a second harmonic suppression of 26.51 dB and the output power of 2.046 dBm at 2.11 GHz.

QUANTUM GRAPH OF SIERPINSKI GASKET TYPE IN ELECTRIC FIELD

  • Blinova, Irina V.;Popov, Igor Y.
    • Communications of the Korean Mathematical Society
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    • v.31 no.2
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    • pp.263-275
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    • 2016
  • Quantum graph of Sierpinski gasket type with attached leads in an electric eld is considered. We study the dependence of the transmission coecient via the wave number of the quantum particle. It has strongly resonance character. The in uence of the amplitude and the orientation of the electric eld on the coecient is investigated.

The sound absorption properties of the recycled PET nonwovens

  • Lee Yun-Ung;Kim Dong-Uk;Baek Mun-Su;Ju Chang-Hwan
    • Proceedings of the Korean Fiber Society Conference
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    • 1998.04a
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    • pp.244-248
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    • 1998
  • The sound absorption materials are generally classified by three types, such as porous, resonator, panel. All of these types are based on theory of energy transform from sound energy to thermal energy. At first, the sound energy transform from the porous type uses to friction and viscose resistance. Secondly, resonator type uses to resonance frequency, absorption coefficient reach the highest.(omitted)

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