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A Speaker Recognition Based on Strange Attractor with Vector Average (벡터 평균값을 갖는 스트레인지 어트랙터 기반 화자인식)

  • Kim, Tae-Sik
    • Speech Sciences
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    • v.8 no.3
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    • pp.133-142
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    • 2001
  • In the area of speech processing, raw signals used to be presented in 2D format and different kinds of algorithms use the format to solve their problems. However, such kinds of presentation methods have limitations to extract characteristics from the signal, even though the algorithms are quiet good. The basic reason is that not much information can be detected from the 2D signal. Strange attractor in the field of chaos theory provides the 3D presentation method. In the area of the recognition problem, signal construction method is very important because good features can be detected from a good shape of attractors. This paper discusses a new presentation method that can be used to construct strange attractor in a different way. Normal strange attractor uses time-delay idea while the new method uses time-delay and vector average. This method provides us good information to be applied to speaker recognition problem.

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Characteristics of Surface Micromachined Pyroelectric Infrared Ray Focal Plane Array

  • Ryu, Sang-Ouk;Cho, Seong-Mok;Choi, Kyu-Jeong;Yoon, Sung-Min;Lee, Nam-Yeal;Yu, Byoung-Gon
    • JSTS:Journal of Semiconductor Technology and Science
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    • v.5 no.1
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    • pp.45-51
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    • 2005
  • We have developed surface micromachined Infrared ray (IR) focal plane array (FPA), in which single $SiO_{2}$ layer works as an IR absorbing plate and $Pb(Zr_{0.3}Ti_{0.7})O_{2}$ thin film served as a thermally sensitive material. There are some advantages of applying $SiO_{2}$ layer as an IR absorbing layer. First of all, the $SiO_{2}$ has good IR absorbance within $8{\sim}12{\mu}m$ spectrum range. Measured value showed about 60% absorbance of incident IR spectrum in the range. $SiO_{2}$ layer has another important merit when applied to the top of Pt/PZT/Pt stack because it works also as a supporting membrane. Consequently, the IR absorbing layer forms one body with membrane structure, which simplifies the whole MEMS process and gives robustness Ito the structure.

Parametric Study of AC Current Lead for the Termination of HTS Power Cable

  • Kim, D.L;Kim, S.H.;S. Cho;H.S. Yang;Kim, D.H.;H.S. Ryoo;K.C. Seong
    • Progress in Superconductivity and Cryogenics
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    • v.5 no.1
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    • pp.107-110
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    • 2003
  • High Temperature Superconductor (HTS) transmission cable can carry more than 2 to 5 times higher electricity and also obtain substantially lower transmission losses than conventional cables. Liquid nitrogen is to be used to cool the HTS power cable and its cost is much cheaper than the liquid helium used for the cooling of metal superconducting wire. In Korea the HTS power cable development project has been ongoing since July, 2001 with the basic specifications of 22.9kV, 50MVA and told dielectric type as the first 3-year stage. The cryogenic system of the HTS cable is composed of HTS cable cryostat termination and refrigeration system. Termination of HTS cable is a connecting part between copper electrical cable at room temperature and HTS cable at liquid nitrogen temperature. In order to design the termination cryostat, it is required that the conduction heat leak and Joule heating on the current lead be reduced, the cryostat be insulated electrically and good vacuum insulation be maintained during long time operation. Heat loads calculations on the copper current lead have been performed by analytical and numerical method and the feasibility study fer the other candidate materials has also been executed.

Comparison of Matrices for Optimal Analysis of Synthetic Polymers Using MALDI-TOF Mass Spectrometry

  • Yoo, Hee-Jin;Kim, Duck-Hyun;Choi, Yoon-Ji;Choi, Jung Hoon;Park, Moonhee;Shin, DongJin;Oh, YoonSeok;Kim, YangSun;Cho, Kun
    • Mass Spectrometry Letters
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    • v.11 no.4
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    • pp.77-81
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    • 2020
  • Characterization of the various chemical aspects of composite polymers is important for quality control of manufactured polymers. In this study, we compared three suitable matrices (α cyano-4-hydroxycinnamic acid [CHCA], 2,5 dihydroxy benzoic acid [2,5-DHB], and dithranol), to characterize various synthetic polymers by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. Although the spectra obtained with the CHCA and 2,5-DHB matrices were generally good, in certain samples ghost peaks disappeared only when dithranol was used as the matrix. Furthermore, we examined the use of sodium trifluoroacetate (NaTFA) as an additive to reduce interference by metals and copolymers in the spectra. In conclusion, appropriate selection of a matrix, according to the characteristics of the polymer, and the use of additives to improve sensitivity are important considerations for polymer analysis and development.

Hydrogenated In-doped ZnO Thin Films for the New Anode Material of Organic Light Emitting Devices: Synthesis and Application Test

  • Park, Young-Ran;Nam, Eun-Kyoung;Boo, Jin-Hyo;Jung, Dong-Geun;Suh, Su-Jeong;Kim, Young-Sung
    • Bulletin of the Korean Chemical Society
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    • v.28 no.12
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    • pp.2396-2400
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    • 2007
  • Transparent In-doped (1 at.%) zinc oxide (IZO) thin films are deposited by pulsed DC magnetron sputtering with H2 mixed Ar atmosphere on glass substrate without any heating process. Even at room temperature, highly c-axis oriented IZO thin films were grown in perpendicular to the substrate. The hydrogenated IZO (IZO:H) film isolated in H2 atmosphere for 30 min exhibited an average optical transmittance higher than 85% and low electrical resistivity of less than 2.7 × 10?3 Ω·cm. These values are comparable with those of commercially available ITO. Each of the IZO films was used as an anode contact to fabricate organic light-emitting diodes (OLEDs) and the device performances studied. At the current density of 1 × 103 A/m2, the OLEDs with IZO:H (H2) anode show excellent efficiency (11 V drive voltage) and a good brightness (8000 cd/m2) of the light emitted from the devices, which are as good as the control device built on a commercial ITO anode.

Theoretical Bases and Technical Application of Breathing Therapy in Stress Management (스트레스 관리 시 호흡치료의 이론적 근거와 기법 적용)

  • 이평숙
    • Journal of Korean Academy of Nursing
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    • v.29 no.6
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    • pp.1304-1313
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    • 1999
  • Breathing is essential for life and at the same time takes a role as a antidote for stress. In the Orient, it was recognized early that respiration, mind, and body have a relation that is inseparable and therefore proper breathing is so important. However, since the mechanism of therapeutic effect by breathing have not been verified, the treatment has been continued till recent years. From that which originated in the Orient, several techniques in the west have been developed to regulate breathing, and have been applying to the clinical situation and to studies, however scientific studies are still lacking. Recently, relaxed breathing has been used as an efficient strategy for breathing therapy as it has an effect on reducing physiological tension and arousal, and, therefore can be used as a basic technique to control or manage stress. In this study, in order to provide basic information and guidelines for clinical application, which will aid in the application of the theoretical basics of breathing therapy and its technique, a review of the literative was conducted. The findings are as follows: 1. Since proper breathing not only has, physically, the important function in supplying oxygen to the body but also gives a good emotional, or pleasant state of mind, it is the first step in controlling physical and mental health. 2. The basic types of breathing can be classified into two types; ‘diaphragmatic breathing(relaxed breathing)’ and ‘chest breathing(stress breathing)’. In yoga type breathing, there are four kinds of breathing, ‘upper breathing’, ‘mid breathing’, ‘down breathing’, and ‘complete breathing’. 3. The theoretical explanation of the positive thera peutic effect of breathing therapy techniques exemplifies good brain function, sufficient air flow through the nasal passages, diaphragmatic movement, light vagal stimulation, CO2 changes and cognitive diversion but in most studies, the hypothesis of CO2 is supported. 4. The technique of breathing is designated with many names according to the muscles and techniques used for breathing, and for control of stress, diaphragmatic breathing(relaxed breathing) is explained as a basic technique best used to manage of stress. 5. The relaxed-breathing includes slow diaphragmatic breathing, breath meditation, nasal breathing, yogic abdominal breathing, Benson's relaxed response, and quiet response.

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The Clinical Observation of Peripheral facial paralysis used Aqua-acupuncture treatment (자하차(紫河車) 약침(藥鍼)이 말초성안면신경마비(末梢性顔面神經麻痺)에 미치는 영향(影響)에 관(關)한 임상적(臨床的) 고찰(考察))

  • Lee, Jung-hyun;Kim, Yeoung-ho;Yook, Tae-han;Lee, Eun-yong;Kim, Ee-Hwa
    • Journal of Acupuncture Research
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    • v.19 no.1
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    • pp.11-23
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    • 2002
  • Objective : Lately oriental medicine treatment of peripheral facial paralysis is various. In various treatments, this study makes a report that effect of our clinic using aqua-acupuncture with hominis placenta for peripheral facial paralysis. Materials and Methods : This report have been observed among twenty-six patients with peripheral facial paralysis who admitted to oriental medicine hospital with Se-myung university during Jan. 1st, 2001 to Oct. fourth, 2001. These patients were divided into two groups; the first group added aqua-acupuncture with hominis placenta to basic oriental medicine treatment., while the second group was only treated with basic oriental medicine treatment. Results : The results of treatment with adding aqua-acupuncture with hominis placenta to basic oriental medicine treatment showed that 9 of 12(75%) patients achieved good or more recovery. While the second group was observed that 6 of 14(50%) patients achieved good or more recovery. Conclusion : The outcome of the observation, we concludes that the therapeutic rate of the group of adding aqua-acupuncture with hominis placenta was higher than that of basic oriental medicine treatment.

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GOOD 2.0 : a Geographical Data Manager using Spatial indices (GOOD 2.0 : 공간 인덱스를 사용한 지리 데이타 관리기)

  • Oh, Byoung-Woo;Han, Ki-Joon
    • Journal of Korean Society for Geospatial Information Science
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    • v.3 no.2 s.6
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    • pp.137-149
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    • 1995
  • A spatial index is necessary to support an efficient search in a geographical information system (GIS) that is important in these days. In this paper, we design and implement a geographical data manager, called GOOD (Geo-object Oriented Data Manager) 2.0, by extending GOOD 1.0 with a spatial index processing module. That is, R-tree and R*-tree are used as a spatial index in this paper to make an efficient search possible. In addition, this paper conducts a performance evaluation to measure the improvement in search efficiency and analyzes the results of the performance evaluation. When the performance evaluation is carried out, we consider various environment factors to allow an GIS administrator to use the results as a basic data in selecting an appropriate spatial index.

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Gyeonggi Provincial Free Uniform Support Project on the Usability through the Cooperation of 'Good School Uniform'

  • Park, Hye-Sook
    • International Journal of Advanced Culture Technology
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    • v.9 no.3
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    • pp.68-73
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    • 2021
  • The 'Good School Uniform' development project was conducted in consultation with Gyeonggi-do and the Gyeonggi Provincial Office of Education. The aim is to find various ways to supply school uniforms reflecting the latest trends at low prices using high-quality textile materials produced in Gyeonggi-do. From 2015, when the 'Good School Uniform' development project started, to the present, various events and fairs are making great progress. However, there are several problems in actually wearing each middle and high school student. In order to satisfy the characteristics of each school and the satisfaction of parents and students together, it is necessary to not only conduct practical research such as closer customer satisfaction surveys, industry-academia-research networks, expert interviews, and surveys, but also several supplements such as consultations between practitioners. There are many domestic studies on the development of school uniform design, but the research on the revitalization plan according to the free school uniform support is very insufficient. Moreover, it is not easy to find recent studies on the development of 'Good School Uniforms'. This study intends to study how to build a system so that the Gyeonggi-do 'Good School Uniform' development project can be used as a role model. In addition, it is expected that this study will be used as basic data for building a nationwide system such as public brand development and collaboration with small domestic companies.

A 3-stage Wideband Q-band Monolithic Amplifier for WLAN

  • Kang, Dong-Min;Lee, Jin-Hee;Yoon, Hyung-Sup;Shim, Jae-Yeob;Lee, Kyung-Ho
    • Proceedings of the IEEK Conference
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    • 2002.07b
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    • pp.1054-1057
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    • 2002
  • The design and fabrication of Q-band 3-stage monolithic microwave integrated circuit(MMIC) amplifier for WLAN are presented using 0.2$\square$ AIGaAs/lnGaAs/GaAs pseudomorphic high electron mobility transistor (PHEMT). In each stage of the MMIC, a negative feedback is used for both broadband and good stability. The measurement results are achieved as an input return loss under -4dB, an output return loss under -10dB, a gain of 14dB, and a PldB of 17dBm at Q-band(36~44GHz). These results closely match with design results. The chip size is 2.8${\times}$1.3mm$^2$. This MMIC amplifier will be used as the unit cell to develop millimeter-wave transmitters for use in wideband wireless LAN systems.

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