• Title, Summary, Keyword: 스파이크 모델

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Spike Response Model and Coding of Neurons (뉴런의 스파이크 응답 모델과 코딩)

  • Lee, Ho-Suk
    • Proceedings of the Korean Information Science Society Conference
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    • pp.5-8
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    • 2007
  • This paper discusses the spike response model of neurons. First, this paper discusses the coding of spikes, the function of spikes, and the construction of the spikes of neurons by the superposition of simple kernel functions. This paper discusses the method of kernel superposition is general than the response of the IF (Integrate-and-Fire) neuron model, too. Next, this paper discusses the coincidence detection and the input weight computation of spiking neurons and the activity of neuron populations in some detail.

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Phoneme Recognition using Temporal and Spectral Features based on Spikegram (스파이크그램 기반의 주파수 및 시간 특성을 이용한 음소 인식)

  • Han, Seokhyeon;Kim, Jaewon;An, Soonho;Shin, Seonghyeon;Park, Hochong
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • pp.156-157
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    • 2019
  • 본 논문에서는 스파이크그램 기반의 주파수 및 시간 특성을 이용한 음속 인식 방법을 제안한다. 기존의 MFCC 특성은 프레임 단위의 평균 특성이기 때문에 시간 해상도가 낮고, 짧은 음소의 특성을 반영하기에는 어렴움이 있다. 반면, 스파이크그램은 청각 모델을 기반으로 샘플 단위로 계산하기 때문에높은 시간 해상도를 가진다. 고 해상도의 스파이크그램을 분석하면 음소 인식에 특화된 특성 벡터를 추출할 수 있다. 추출된 특성으로 심층 신경망을 학습시켜 음소 인식기를 구현하였고, TMIT 테이터 세트로 성능을 평가하였다. 성능 평가를 통하여 스파이크그램 기반의 새로운 시간-주파수 특성을 사용하여 MFCC 특성과 유사한 성능의 음소인식이 가능한 것을 확인하였다.

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Speech Feature Extraction based on Spikegram for Phoneme Recognition (음소 인식을 위한 스파이크그램 기반의 음성 특성 추출 기술)

  • Han, Seokhyeon;Kim, Jaewon;An, Soonho;Shin, Seonghyeon;Park, Hochong
    • Journal of Broadcast Engineering
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    • v.24 no.5
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    • pp.735-742
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    • 2019
  • In this paper, we propose a method of extracting speech features for phoneme recognition based on spikegram. The Fourier-transform-based features are widely used in phoneme recognition, but they are not extracted in a biologically plausible way and cannot have high temporal resolution due to the frame-based operation. For better phoneme recognition, therefore, it is desirable to have a new method of extracting speech features, which analyzes speech signal in high temporal resolution following the model of human auditory system. In this paper, we analyze speech signal based on a spikegram that models feature extraction and transmission in auditory system, and then propose a method of feature extraction from the spikegram for phoneme recognition. We evaluate the performance of proposed features by using a DNN-based phoneme recognizer and confirm that the proposed features provide better performance than the Fourier-transform-based features for short-length phonemes. From this result, we can verify the feasibility of new speech features extracted based on auditory model for phoneme recognition.

A study on the receive buffer control schemes for bobile multimedia services (이동 멀티미디어 서비스를 위한 수신버퍼 제어에 관한 연구)

  • 이태훈;김용득
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.23 no.4
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    • pp.940-949
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    • 1998
  • The paper proposes an effective mechanism hiring the adaptive buffer control schemes on the mobile seceiver's side that can resolve the problems of delay spikes caused by the handover process onthe cell boundaries when they transmit real-time moving images through the high speed wireless channels. to confirm the effectiveness of the proposed schemes, we have modeled the characteristics of the random errors on the wireless channels, the burst errors and that of the transmission delay by the handover. We also compared the rate of the delay-adaptation of the receive buffers caused by the delay and delay spikes. the comparison was done by testing the suggested schemes against the existing schemes by applying tehm to the packet delay model. We also could identify the noticable reduction of the casesof buffer delay and overflow compared with the conventional schemes, by applying the suggested algorithm to the video image compressed by H.263.

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The Conservation Value of Coral Communities in Moonseom Ecosystem Protected Area (문섬 등 주변해역 생태계보호구역 내 산호군락지의 보전가치)

  • Park, So-Yeon;Lee, Chang-Su;Kim, Min-Seop;Jo, In-Young;Yoo, Seung-Hoon
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.24 no.1
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    • pp.101-111
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    • 2018
  • The Korean government has been trying to conserve a marine ecosystem that has been shifting due to climate change. As part of this effort, the government designated seventy-seven marine species that have been disappearing and deserve to be protected as endangered managing them specially. To generate basic data to guide policy for these endangered species, their value must be measured. OOf the species declared endangered, coral is particularly threatened by climate change, and its management is important. Accordingly, understanding the potential value of reefs, can be an effective way of proving the benefits of continuous management to decision makers and the general public alike. To this end, we have applied the contingent valuation method (CVM), an economic technique of for valuing a environmental and non-market goods such as a coral reef. A national face-to-face survey of 1,000 randomly selected households was conducted in order to determine the public's willingness to pay (WTP) for conserving coral reefs. A one-and-one-half-bound (OOHB) model was adopted to interpret WTP responses, and a spike model was employed to deal with zero WTP responses. The results show that the conservation value of a coral reef can be estimated at 3,016 won per household per year, statistically significant at the 1 % level. Expanding values to the national population gives an annual value of 58.9 billion won. We can conclude that the public is willing to pay a significant amount to conserve coral reefs.

Transient Heat Transfer and Structural Analyses for the Turbopump Turbine of a Liquid Rocket Engine (액체 로켓 터보 펌프 터빈의 천이 열전달 및 구조 해석)

  • Yoo, Jae-Han;Choi, Ji-Hoon;Lee, In;Han, Jae-Hung;Jeon, Seong-Min;Kim, Jin-Han
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.32 no.3
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    • pp.58-65
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    • 2004
  • Thermal and structural finite element analyses were performed for the turbopump turbine bladed disk model with shroud of a liquid rocket engine. The only 1/80 part model was analyzed which consists of 3D eight node isoparametric solid elements. The applied loading history consists of a startup condition with a thermal spike and a steady state. Heat transfer coefficient on the blade was predicted using the commercial Navier-Stokes solver, Fluent. Transient thermal responses during startup and steady states were calculated using a 3D finite element code developed. Maximum stress and shroud tip displacement under the influence of centrifugal and thermal loading were also determined.

Design Study of a Simulation Duct for Gas Turbine Engine Operations (가스터빈엔진을 모의하기 위한 시뮬레이션덕트 설계 연구)

  • Im, Ju Hyun;Kim, Sun Je;Kim, Myung Ho;Kim, You Il;Kim, Yeong Ryeon
    • Journal of the Korean Society of Propulsion Engineers
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    • v.23 no.1
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    • pp.124-131
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    • 2019
  • A design study of gas turbine engine simulation duct was conducted to investigate the operating characteristics and control gain tunning of the Altitude Engine Test Facility(AETF). The simulation duct design involved testing variable spike nozzle and ISO standard choking nozzle to verify the measurements such as mass flow rate and thrust. The simulation duct air flow area was designed to satisfy Ma 0.4 at the aerodynamic interface plane(AIP) at engine design condition. The test conditions for verifying the AETF controls and measurement devices were deduced from 1D analysis and CFD calculation results. The spike-cone driving part was designed to withstand the applied aero-load, and satisfy the axial traversing speed of 10 mm/s at whole operation envelops.