• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.14 no.6
• /
• pp.1323-1330
• /
• 2010

The amount of acoustic data gathered from the acoustic data gathering system is increased dramatically as the acoustic data gathering system become various and highly effective. It is needed to transmit this acoustic data to analysis environment for precise analysis. In this gathering/analysis system, it is also needed the stable transmitting as well as highly perfect security. But the existing system using the conveying method needs a lot of time. In case of using networks, the low speed networking vulnerable in the stable transmitting and the information security is impossible to materialize. In this paper, I would like to propose a transmitting and management system sending a massive gathering acoustic data in the unsecurity and low speed networking environment. The implemented system is to transmit the acoustic data safely in low speed networking environment and secure the acoustic data from various threats.

• Proceedings of the Acoustical Society of Korea Conference
• /
• spring
• /
• pp.339-342
• /
• 2002

본 논문에서는 디지털 컨텐츠를 보호하기 위한 다양한 암호화 알고리즘이나 워터마크 알고리즘이 하나의 사용자 단말에서 작동할 수 있도록 시스템을 구성하였으며, 컨텐츠의 재생 처리 과정 중에 다수의 제어 포인트를 두어 다중적인 컨텐츠 보호를 가능하게 하였다. 또한 라이센스 개념을 사용하여 다양한 컨텐츠 사용 규칙을 적용할 수 있도록 하였으며 컨텐츠와 라이센스를 독립적으로 관리하므로 사용자들 사이의 컨텐츠 전송을 가능하게 하였다.

• The Journal of the Acoustical Society of Korea
• /
• v.39 no.4
• /
• pp.342-350
• /
• 2020

Acoustic and vibration research activities for the structural development of Korean space launch vehicles are introduced in this paper. Various dynamic loads exerted on a launch vehicle during its operation are summarized. The acoustical design method of payload fairings which protect satellites from harsh launch environment was reviewed. Several acoustic research activities were performed to enhance the analytical prediction ability during the development period of the Naro and the Nuri launcher. Specifically, the following research activities are reviewed: a test and vibro-acoustic analysis of composite cylinders whose layup properties are varied, a research on low-frequency acoustic load reduction by an acoustic resonator array and an acoustic test on the cylinder part of the Naro payload fairing. A vibro-acoustic analysis result for the Nuri launcher was introduced and predicted acoustic and vibration levels and measured ones are shown to be in a good agreement.

• Journal of the Korea Institute of Information Security & Cryptology
• /
• v.32 no.5
• /
• pp.881-890
• /
• 2022

As individual and group users actively use drones, the risks (Intrusion, Information leakage, and Sircraft crashes and so on) in no-fly zones are also increasing. Therefore, it is necessary to build a system that can detect drones intruding into the no-fly zone. General acoustic drone detection researches do not derive location-independent performance by directly learning drone sound including environmental noise in a deep learning model to overcome environmental noise. In this paper, we propose a drone detection system that collects sounds including environmental noise, and detects drones by removing noise from target sound. After removing environmental noise from the collected sound, the proposed system predicts the drone sound using Mel spectrogram and CNN deep learning. As a result, It is confirmed that the drone detection performance, which was weak due to unstudied environmental noises, can be improved by more than 7%.

• Proceedings of the Korea Society for Industrial Systems Conference
• /
• 2003.05a
• /
• pp.75-80
• /
• 2003

본 연구에서는 DES 알고리즘과 EDE 알고리즘을 이용한 데이터 암호화와 전자서명 기술을 접목한 인터넷 폰 보안시스템을 구현하였다. 비밀키 알고리즘의 키 분배 문제를 해결하기 위하여 Diffie-Hellman 알고리즘을 이용한 새로운 키 분배 방법을 제안하였다. 그리고 암호화에 따른 전송지연 시간을 감소시키기 위해 DES 알고리즘의 S-Box와 P-Box를 하나의 테이블로 조합하여 운영하였다. 제안된 인터넷 폰 보안 시스템은 자바로 구현하였으며, 실험결과 DES 알고리즘을 이용할 경우 1.46초, EDE 알고리즘을 이용할 경우 3.25초의 전송지연 시간을 보였다. 제안된 시스템에서 사용된 기술들은 향후 음향제작물의 저작권 보호와 인터넷을 이용하는 데이터의 보호에 적용할 수 있을 것으로 생각된다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2009.10a
• /
• pp.164-167
• /
• 2009

The amount of acoustic data gathered from the acoustic data gathering system is increased dramatically as the acoustic data gathering system become various and highly effective. It is needed to transmit this acoustic data to analysis environment for precise analysis. In this gathering/analysis system, it is also needed the stable transmitting as well as highly perfect security. In this paper, I would like to propose a transmitting and management system sending a massive gathering acoustic data in the unsecurity and low speed networking environment. The implemented system is to transmit the acoustic data safely in low speed networking environment and secure the acoustic data from various threats.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2023.11a
• /
• pp.1025-1026
• /
• 2023

최근의 범죄 동향을 살펴보면 묻지마 범죄와 여성 혐오 범죄가 계속해서 늘어나는 추세이다. 낮과 밤을 구분하지 않고 일어나는 사건·사고들에 특히나 범죄에 노출되기 쉬운 여성들은 일상생활에서조차 안전을 보장받지 못하고 있다. 이를 위해 생겨난 여성안심 귀갓길이라고 지정된 보호구역은 보호라는 말이 무색하게 제대로 사용할 수 있는 방범 시스템이 제대로 마련되어 있지 않은 실정이다. 이와 같은 상황을 개선하기 위해 기존의 시각적 방범과는 달리 탐지 범위가 넓고 상대적으로 제한이 적은 음향으로 접근한 새로운 방범 시스템 개발을 통해 여성들의 안전을 보장할 수 있도록 제안한다.

• The Journal of the Acoustical Society of Korea
• /
• v.41 no.5
• /
• pp.481-491
• /
• 2022

The active sonar transmission system consists of a transmitter that outputs an electrical signal and an underwater acoustic transducer that converts the amplified electrical signal into an acoustic signal. In general, the transmitter output characteristics are dependent on load impedance, and an underwater acoustic transducer, which is a transmitter load, has a characteristic that the electrical impedance varies largely according to frequency when driven. In such a variable impedance condition, the output of the active sonar transmission system may become unstable. Hence, this paper proposes a design and control technique of a sonar transmitter for transmitting a stable transmission signal even under variable impedance conditions of an underwater acoustic transducer in an active sonar transmission system. The electrical impedance characteristics of the underwater acoustic transducer are experimentally analyzed, and the sonar transmitter is composed of a single-phase full-bridge inverter, an LC filter, and a matching circuit. In this paper, the design and output control method of the sonar transmitter is proposed to protect the transmitter and transducer. It can secure stable output voltage characteristics even if it transmits the Linear Frequency Modulation (LFM) signal. The validity is verified through the simulation and the experiment.

• Proceedings of the Korean Society of Fisheries Technology Conference
• /
• 2003.05a
• /
• pp.72-73
• /
• 2003

최근들어 인공어초의 경우 그것을 투입한 후 그 효과에 대한 문제가 많이 대두되고 있다. 인공어초는 연안어장에 인공적인 구조물을 설치하여 대상 수산물 보호, 육성하는 것을 목적으로 하는 어장 시설물이다. 인공어초를 투입한 후 그 효과를 조사하는 수단인 자망에 의한 어획실험, 장수조사, 표지방류 등이 있다. 하지만, 자망은 어초에 대한 어류의 직접적인 반응을 알기 어렵고 잠수조사는 시간의 제약성, 그리고 표지방류에 의한 방법은 재어획이 이루어져야 정보를 제공해줄 수 있다는 단점이 있다. (중략)

• The KIPS Transactions:PartC
• /
• v.9C no.2
• /
• pp.157-162
• /
• 2002

In this study, the secure Internet phone system using digital signature and data encryption with DES algorithm and EDE algorithm was implemented. And new key distribution algorithm was suggested utilizing the Diffie-bellman algorithm. For reducing processing time, a table combined with S-BOX and P-BOX of the DES was used. The proposed system was implemented with Java and the results showed the processing time using DES algorithm for encryption was 1.46 seconds and that of EDE algorithm was 3.25 seconds respectively. This system can be applied to Protect the copyright of sound products and data using internet.