• Title/Summary/Keyword: DB Listener

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Design of the Specific IP Access Deny for the Database (데이터베이스에서 지정된 IP 주소 접근 금지를 위한 기능 설계)

  • Jang, Seung-Ju;Kim, Sung-Jin
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.39C no.8
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    • pp.716-721
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    • 2014
  • This paper proposes how to prevent of vulnerability from IP address attack of Oracle DB by C program environments. An attacker may try to login DB by connectng remote IP address. Recently an attacker use foreign IP address and try to connect to DB using known DB account. Therefore, DB data is frequently disclosed. I propose a new idea that develops specific IP address blocking module in C program in the Oracle DB. By this module, we can use the Oracle DB safely.

Improvement of front-back sound localization characteristics in headphone-based 3D sound generation (헤드폰 기반의 입체음향 생성에서 앞/뒤 음상정위 특성 개선)

  • 김경훈;김시호;배건성;최송인;박만호
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.29 no.8C
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    • pp.1142-1148
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    • 2004
  • A binaural filtering method using HRTF DB is generally used to make the headphone-based 3D sound. But it can make some confusion between front and back directions or between up and down directions due to the non-individual HRTF depending on each listener. To reduce the confusion of sound image localization, we propose a new method to boost the spectral cue by modifying HRTF spectra with spectrum difference between front and back directions. Informal listening tests show that the proposed method improves the front-back sound localization characteristics much better than the conventional methods

Improvement of virtual speaker localization characteristics using grouped HRTF (머리전달함수의 그룹화를 이용한 가상 스피커의 정위감 개선)

  • Seo, Bo-Kug;Cha, Hyung-Tai
    • Journal of the Korean Institute of Intelligent Systems
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    • v.16 no.6
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    • pp.671-676
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    • 2006
  • A convolution with HRTF DB and the original sound is generally used to make the method of sound image localization for virtual speaker realization. But it can decline localization by the confusion between up and down or front and back directions due to the non-individual HRTF depending on each listener. In this paper, we study a virtual speaker using a new HRTF, which is grouping the HRTF around the virtual speaker to improve localization between up and down or front and back directions. To effective HRTF grouping, we decide the location and number of HRTF using informal listening test. A performance test result of virtual speaker using the grouped HRTF shows that the proposed method improves the front-back and up-down sound localization characteristics much better than the conventional methods.

Improvement of sound localization for real 3D Sound (현실적인 3D 입체음향 구현을 위한 HRTF의 앞/뒤 음상정위 특성 개선)

  • Koo, Kyo-Sik;Han, Sang-Il;Seo, Bo-Kug;Cha, Hyung-Tai
    • Proceedings of the IEEK Conference
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    • 2007.07a
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    • pp.415-416
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    • 2007
  • HRTF DB, including the information of the sounds which is arrived to our ears, is generally used to make a 3D sound. But it can decline some three-dimensional effects by the confusion between front and back directions due to the non-individual HRTF depending on each listener. In this paper, we propose a new method to use psychoacoustic theory that reduces the confusion of sound image localization. And we make use of an excitation energy by the sense of hearing. This method is brought HRTF spectrum characteristics into relief to draw out the energy ratio about the bark band and control low frequency band. Informal listening tests show that the proposed method improves the front-back sound localization characteristics much better than the conventional methods.

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Improvement of front/back Sound Localization Characteristics using Psychoacoustics of Head Related Transfer Function (머리전달함수의 심리음향적 특성을 이용한 전/후 음상정위 특성 개선)

  • Koo, Kyo-Sik;Cha, Hyung-Tai
    • Journal of Broadcast Engineering
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    • v.11 no.4 s.33
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    • pp.448-457
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    • 2006
  • HRTF DB, including the information of the sounds which is arrived to our ears, is generally used to make a 3D sound. But it can decline some three-dimensional effects by the confusion between front and back directions due to the non-individual HRTF depending on each listener. In this paper, we propose a new method to use psychoacoustic theory that reduces the confusion of sound image localization. And we make use of an excitation energy by the sense of hearing. This method is brought HRTF spectrum characteristics into relief to draw out the energy ratio about the bark band. Informal listening tests show that the proposed method improves the front-back sound localization characteristics much better than the conventional methods.