• The Korean Journal of Emergency Medical Services
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• v.12 no.2
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• pp.71-84
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• 2008

The usual reasons for elderly safety accidents include lack of care for disaster, physical disability, and an error of judgment and so on. But it is true that accidents will occur continuously with the afore-mentioned causes. Against the elderly safety accidents, safety is the main prerequisite for leading the successful and easy life in the elderly. Therefore, this study is purposed to provide the way of thinking about elderly safety issues by suggesting the methods and contents of education program. This study is specifically focused on developing audio-visual materials involved in all the safety accidents and researching the effect of safety education ability through materials with a view to identify the substantial problems. Education program should make a continuous and long term study so that the curricula of the safety accidents prevention education can be done systematically.

• The Journal of Information Systems
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• v.16 no.1
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• pp.47-64
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• 2007

The telecommunication service industry plays a major role in the realization of the perfect information society in the 21st century and, has a great influence in society and culture. Using the Calculable General Equilibrium Model, we analyze the telecommunication service's economic effects on other industries as well as on the national economy. In 2001, the 8 percent increase in the telecom sales caused the 5 billion dollar increase in the GDP, which seems to continue to bring about no less than 5 billion dollar GDP increase each year until 2030. The telecom sales increase has been evaluated to have disproportionately positive effect on transmission device and audio equipment industries. In summary, the telecom sales have a positive net enぉ on the GDP and on most of the industries with a few exceptions.

• Proceedings of the KOSOMBE Conference
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• v.1997 no.05
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• pp.418-421
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• 1997

We examined the effect of the auditory stimulus on postural control. The auditory stimulus control system composed of 8 speakers ,the audio amplifier, the PPI interface and the sound controller. We measured the sway of head position and COP. Our result showed that the auditory stimulus was effective on postural control. It also indicated that the auditory stimulus system might be applied to clinical use as a new postural control training system.

• The Transactions of the Korean Institute of Electrical Engineers D
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• v.51 no.7
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• pp.302-307
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• 2002

Digital watermarking is the technique, which embeds an invisible signal including signal including owner identification and copy control information into multimedia data such as audio, video, and images for copyright protection. A new MPEG watermark embedding algorithm using complex block effect based on the Human Visual System(HVS) is introduced in this paper. In this algorithm, $8{\times}8$ dark blocks are selected, and the watermark is embedded in the DC component of the discrete cosine transform(DCT) by using quantization and modulus calculation. This algorithm uses a blind watermark retrieval technique, which detects the embedded watermark without using the original image. The experimental results show that the proposed watermark technique is robust against MPEG coding, bitrate changes, and various GOP(Group of Picture) changes.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2003.11a
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• pp.183-188
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• 2003

This study is to make the fundamentals of sound quality evaluation in regard of acoustical characteristics of passenger compartment. The deviation of frequency response function level within audible frequency is evaluated at receiving point in the research of room acoustics. In this study, frequency response function is the one between speaker and driver's ear positions. The positions of driver and audio speakers are optimized by analysis of acoustic mode of acoustic cavity. The main reflection planes are determined by analysis sound ray path diffused at optimized speaker positions. Finally, designer selects acoustical material by analysis of absorption effect of acoustical materials on the main reflection planes in order to avoid to distortion and fluctuation of frequency response function..

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2006.05a
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• pp.970-973
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• 2006

The effects of the additional visual and auditory stimuli on the loudness evaluation of road traffic noise was investigated by the method of magnitude estimation. As a result, it was shown that additional visual stimulus of noise barrier can influence on the loudness perception of road traffic noise. Also, additional auditory stimuli such as green music or sound of flowing water can influence on the loudness perception of road traffic noise. approximately $5{\sim}10%$ lower than the absence of stimuli. But this effect was disappeared in the range of over 65dB(A).

• Proceedings of the KIEE Conference
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• 2000.07d
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• pp.2389-2391
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• 2000

To design high quality products at low cost is one of very important tasks for engineers. Design optimization for performances can be one solution in this task. There is the robust design which has been proved effectively in many fields of engineering design. In this paper, the concept of robust design is introduced and combined to the fuzzy optimization method and the fuzzy logic system method with non-singleton. These methods are applied for data analysis to get optimum parameters and to reduce experiments. The optimum parameter set points are obtained by the proposed methods. These methods are applied to a filter circuit, a part of the audio circuit of mobile radio transceiver. The simulation results are compared each other. The new methods reduce and predict the effect of parameter variation sources

• Proceedings of the Acoustical Society of Korea Conference
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• spring
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• pp.403-406
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• 2002

휴대폰의 일반화와 이것의 음향변환기로 사용되는 초소형 스피커 (Micro-speaker) 수요의 증가에 따라 휴대폰의 다양한 기능 및 성능의 개발에 대한 초소형 스피커의 성능개선이 절실히 요구된다. 특히, 초소형 스피커에서 발생된 음의 명료도와 음의 방사효율에 관한 특성의 개선은 당면한 문제이다. 본 연구에서는 초소형 스피커 전면에 진동판 보호를 위해 부착되어 있는 전면 덮개(Front Cover)를 스피커의 명료도와 효율에 관련된 음향적 기구로서 고려하여 일반 휴대폰에 사용되고 있는 초소형 스피커들을 대상으로 전면덮개에 가공된 기공의 면적에 따른 음파의 투과손실을 측정하였다. 또한, 전면덮개와 초소형 스피커 진동판 사이에 존재하는 체적과 전면 덮개의 기공에 대한 음향 임피던스(Acoustic Impedance)를 이론적인 방법으로 구하여 이에 따른 투과손실(Transmission Loss) 및 공명특성을 예측하고 이를 스피커들에 대한 투과손실 측정 결과와 비교하였다. 본 연구의 결과는 초소형 스피커를 제조하는 기업들이 경험적인 방법을 벗어나, 이론적 근거를 바탕으로 제품설계를 수행하는데 기여할 것으로 사료된다.

• Proceedings of the Korea Information Processing Society Conference
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• 2014.04a
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• pp.985-987
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• 2014

우리는 우리가 방문하는 박물관에 대한 배경지식이 없으면 박물관에서 제공하는 오디오 가이드를 이용한다. 그러나 기존의 오디오 가이드는 크게 두 가지 문제점이 있다. 첫째, 기존의 오디오 가이드는 단순히 성우가 텍스트 컨텐츠를 읽은 것에 지나지 않기 때문에 지루하다. 지루하기 때문에 사용자들은 자연스레 오디오 가이드에 집중하지 못한다. 둘째, 기존의 오디오 가이드에는 포인트가 없다. 오디오 가이드에서 성우들의 목소리에 톤이나 어조가 일정하기 때문에 사람들은 오디오 가이드를 들을 때 중요한 부분에 대해 알지 못한다. 이러한 문제점들을 해결하기 위해서 우리는 기존의 오디오 가이드 컨텐츠의 키워드에 단어와 관계있는 음향효과를 추가해서 새로운 오디오 가이드를 만들었다. 새로운 오디오 가이드는 기존의 오디오 가이드의 문제점인 지루함과 중요 포인트가 없음을 해결해서 사용자의 흥미도와 집중력을 높여주었다. 우리의 실험이 성공적이었기 때문에 향후 우리의 이론은 좀 더 일반적인 컨텐츠들로 확장 될 수 있을 것이다.

• Proceedings of the Acoustical Society of Korea Conference
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• 1994.06a
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• pp.991-996
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• 1994

Surrounding noise often affects the performance of speech recognition system when it is used in office or home. Especially situation is more serious when colored and nonstational noise such as an sound from television or other audio equipment is introduced. The authors proposed a voice control system for television set using an adaptive noise canceler, and it works well even is sound of television set has comparable level of speech. In this paper, a new front-end of speech recognition is introduced for the voice control system. This font-end utilizes a simplified masking model to reduce the effect of residual noise. According to experimental results, 90% correct recognition is achieved even if the level of television sound is almost 15dB higher than one of speech.