• Proceedings of the Korean Information Science Society Conference
• /
• 2011.06a
• /
• pp.458-461
• /
• 2011

본 논문에서는 요주의 인물 식별 시스템의 서브시스템으로 SRC 기반의 실시간 정면 얼굴 탐지 시스템을 제안한다. 제안된 시스템은 개선된 피부색 탐지기를 통해 실시간으로 입력되는 영상의 이미지로부터 얼굴 탐지 범위를 축소하고, 단계형 분류기를 통해 얼굴 여부를 빠른 속도로 탐지함으로써 실시간 탐지가 가능케 하였다. 또한 최근 얼굴 인식 분야에서 성공적인 업적을 보여주고 있는 신호 처리 분야의 SRC를 이용하여 정면 얼굴, 비정면 얼굴, 그리고 비얼굴을 분류하여 정면 얼굴만을 출력함으로써 정면 얼굴 탐지율을 높힌다. 공인된 벤치마킹 데이터인 FEI Face Database을 사용하여 제안된 SRC 기반의 정면 얼굴 탐지 시스템의 성능을 실험적으로 평가한다.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
• /
• v.15 no.4
• /
• pp.360-367
• /
• 2004

In this paper, we have implemented the digital signal processing system for intruder detection using speckle pattern variation in multi-me optical fiber with hypersensitive and high fidelity. The performance of the implemented system was evaluated by experiments. In order to improve the system performances we applied the adaptive digital filter. In experimental results we could see 96 % intruder detection and 90 % man/car discrimination probability.

• Proceedings of the Korean Institute of Intelligent Systems Conference
• /
• 2002.12a
• /
• pp.309-312
• /
• 2002

본 논문에서는 오디오 워터 마킹 기법을 제안한다. 이 방법은 5차 웨이브릿 변환을 이용한sync 탐지 기법을 제안한다. 이 원리를 Zuicker의 인간청각모델의 한계 밴드이론을 이용한다. 그리고 워터마킹 검출에는 정점 탐지 기법에서 많이 이용하는 에너지와 제로통과 비율을 이용하여 워터마크를 검출한다 실험을 통하여 본 알고리즘이 mp3압축에 강인할 뿐 아니라 디지털에서 아날로그신호로 바꾸고 다시 디지털 신호로 바꾸는 아날로그 공격에 시간영역이나 DCT영역에서 워터마킹을 행하는 것보다 본 알고리즘이 강인함을 보인다 본 오디오 알고리즘은 음악에 연동하는 전기기기를 구성할 때 유용한 알고리즘이 될 수 있다. 즉 음악에 워터마크를 삽입하여 이 워터마크를 전기기기 동작제어 비트열로 이용할 수 있을 것이다.

• Journal of the Korean Society of Fisheries and Ocean Technology
• /
• v.31 no.3
• /
• pp.247-255
• /
• 1995

This paper describes a personal computer(PC) based color fish finder to improve some problem of the commercial one. The commercial fish finder has no function of the echo data logging and replaying. The authors developed two types of the PC based color fish finder. One is a master type composed of a PC, a digital input-output board, and analog to digital converting (A/D) board and an ultrasonic transceiver unit, the other is a slave type composed of a PC and an A/D board. To test the performances of the master type experiments were carried out in air and in a water tank. It is found that the designed master type fish finder displays very well an eight-colored echogram by one dot resolution to the left side of the PC monitor. Also, the depth of echo signal was corresponds very well to the range from the transducer to a target. The sampling interval of echo signal is about 0.1m and the time of A/D conversion is 30 $\mu$sec. On the other hand, to test the performances of the slave type a raw data of echo signals from a data logger was supplied directly or via RF transceivers to the slave type one. From this experiment, it is confirmed the slave type is useful to replay the echo signal from the data logger or a telesounder.

• Journal of the Korean Society for Nondestructive Testing
• /
• v.23 no.3
• /
• pp.227-236
• /
• 2003

Leaks in underground pipelines can cause social, environmental and economical problems. One of relevant countermeasures against leaks is to find and repair of leak points of the pipes. Leak noise is a good source to identify the location of leak points of the pipelines. Although there have been several methods to detect the leak location with leak noise, such as listening rods, hydrophones or ground microphones, they have not been so efficient tools. In this paper, acoustic emission (AE) sensors and accelermeters are used to detect leak locations which could provide all easier and move efficient method. Filtering, signal processing and algorithm of raw input data from sensors for the detection of leak location are described. A 120m-long pipeline system for experiment is installed and the results with the system show that the algorithm with the AE sensors and accelerometers offers accurate pinpointing of leaks. Theoretical analysis of sound wave propagation speed of water in underground pipes, which is critically important in leak locating, is also described.

• The Journal of the Korea Contents Association
• /
• v.18 no.11
• /
• pp.484-492
• /
• 2018

This study examined the effects of field complexity and type of target objects on the performance in baggage screening task. A total of 62 participants(male: 45.2%, female: 54.8%) participated and their mean age was 22.88. The simulated baggage screening task was developed for this study and after the orientation and task exercises, main experiment session was conducted. Participants performed a total of 200 tasks and 40(20%) contained target object. The complexity was set at three levels: high, middle, and low levels and the number of background items contained 20, 14. and 8 respectively. The type of target was set as gun, knife, liquid, and righter. The dependent variables were hit ratio and reaction time. The results showed that the hit ratio decreased and reaction time increased significantly as field complexity increased, and they varied depending on the type of target. The hit ratio of the knife was the highest and liquid lowest and reaction time of the knife was the fastest and liquid slowest. In addition, the interaction effect was also significant. Knife was not affected by complexity, however, small item such as lighter was most affected by complexity.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2000.10a
• /
• pp.602-605
• /
• 2000

This paper describes the development and utilization of digital telesounder system. The digital telesounder system consists of two parts. The one is sea station part, which consist of power, single board computer, A/D converter, and RF modem. The two is land station part, which consist of RF modem, color display, memory system and printer. We obtained good results at the two times of sea experiments. The digital telesounder system is sufficiently good and clear to color display the information of fish school in setnet.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
• /
• v.28 no.5
• /
• pp.419-425
• /
• 2017

This paper presents CMOS UWB RFIC based radar system for high speed target detection. The system can achieve resolution of 15 cm and detection range of 15 m. For developed system, single chip CMOS UWB IC is implemented. To reduce the measuring and processing time, envelope detection and equivalent time sampling technique are used. Measurement results show that the bandwidth and center frequency of UWB pulse can be adjusted in the range of 0.5 GHz~1.0 GHz, 3.5 GHz~4.5 GHz, respectively. Signal processing time including scan time over 15 m distance is about $150{\mu}sec$.

• Journal of Advanced Marine Engineering and Technology
• /
• v.38 no.9
• /
• pp.1125-1130
• /
• 2014

In this paper, we propose a sound reception system against surrounding noise for ships based on digital signal processing technologies. In order to suppress unwanted surrounding noises, a digital band-pass filter is designed, which the pass-band of the filter is between 70Hz to 820Hz. Also, we develope a sound direction indicating algorithm with 4 microphones. After filtering the audio signals from 4 microphones, the developed sound direction indicating algorithm can indicate 8 directions. In addition, we implement prototype board for the sound reception using a digital signal processor chip and audio codecs, and verify the proposed algorithm.

• The Journal of the Acoustical Society of Korea
• /
• v.34 no.1
• /
• pp.75-81
• /
• 2015

In active sonar system, clutters degrade performance of target detection/tracking and overwhelm sonar operators in ASW (Antisubmarine Warfare). Conventional clutter reduction algorithms using consistency of local peaks are studied in multi-ping data and tracking filter research for active sonar was conducted. However these algorithms cannot classify target and clutters in single ping data. This paper suggests a single ping clutter reduction approach to reduce clutters in mid-frequency active sonar system using echo shape features. The algorithm performance test is conducted using real sea-trial data in heavy clutter density environment. It is confirmed that the number of clutters was reduced by about 80 % over the conventional algorithm while retaining the detection of target.