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Listener Auditory Perception Enhancement using Virtual Sound Source Design for 3D Auditory System
강철용,마리아판 비나야감,조주필,이선희 한국인터넷방송통신학회 2016 Journal of Advanced Smart Convergence Vol.5 No.4
When a virtual sound source for 3D auditory system is reproduced by a linear loudspeaker array, listeners can perceive not only the direction of the source, but also its distance. Control over perceived distance has often been implemented via the adjustment of various acoustic parameters, such as loudness, spectrum change, and the direct-to-reverberant energy ratio; however, there is a neglected yet powerful cue to the distance of a nearby virtual sound source that can be manipulated for sources that are positioned away from the listener's median plane. This paper address the problem of generating binaural signals for moving sources in closed or in open environments. The proposed perceptual enhancement algorithm composed of three main parts is developed: propagation, reverberation and the effect of the head, torso and pinna. For propagation the effect of attenuation due to distance and molecular air-absorption is considered. Related to the interaction of sounds with the environment, especially in closed environments is reverberation. The effects of the head, torso and pinna on signals that arrive at the listener are also objectives of the consideration. The set of HRTF that have been used to simulate the virtual sound source environment for 3D auditory system. Special attention has been given to the modelling and interpolation of HRTFs for the generation of new transfer functions and definition of trajectories, definition of closed environment, etc. also be considered for their inclusion in the program to achieve realistic binaural renderings. The evaluation is implemented in MATLAB.
회의실의 명료성(STI) 향상을 위한 오디오신호 처리 및 시스템 설계
강철용,이석주,조광연,이선희 한국인터넷방송통신학회 2017 한국인터넷방송통신학회 논문지 Vol.17 No.2
최근에 오디오 신호의 디지털 전송기술의 발전 및 디지털 전송기술을 이용한 오디오 네트워크 장비들의 출시 가 이루어지고 있다. 이에 따라 음향시스템의 설계 및 시공에 있어서도 오디오 네트워크 기술 및 장비의 적용이 적극 적으로 이루어지고 있다. 회의실이라는 공간은 다수의 참가자가 상호의견교환 및 의사전달을 하는 공간으로, 발언내용 이 참석자에게 잘 전달되어야 한다. 마이크 및 스피커 등의 전기음향 장치를 이용하는 것 만 아니라 오디오 네트워크 를 이용한 사례를 통해 회의실의 명료도 향상을 개선하고 실제 사례를 통해 오디오 네트워크를 이용한 음향시스템 설 계의 적용과 향후 발전방향을 전망한다. Recently, the development of digital transmission technology of audio signals and the introduction of audio network equipment using digital transmission technology have been made. As a result, audio network technology and equipment are actively applied to the design and construction of audio systems. The meeting room is a place where a large number of participants exchange opinions and communicate with each other. In addition to using an electric acoustic device such as a microphone and a speaker, it improves the intelligibility of the conference room through an example using an audio network.
실직자 재취직 직업훈련 과정의 질적 수준과 교육 만족도에 관한 연구
황경태,강철용 東國大學校 1999 東國論叢 Vol.38 No.-
The major objectives of the study are to analyze the relationship between the quality level of occupational training course for the umemployed and their educational satisfaction, to identify the problems of the courses, and to propose the solutions to the identified problems. In order to accomplish the research objectives, a research model was developed and then a survey was performed based on the model. The major findings of the study are as follows: First of all, as for the training environment, it was found that the trainees obtain employment information through newspapers and mass media, and that the major reason for taking courses is development of their talents. It was found that the kinds of occupation which they would like to enter fit well with the kinds of occupational training course, and that age is a major stumbling block in getting a job. According to the survey, trainees think that the possibility of getting a job and/or start up of an business are not promising at this point. With regard to the period of training, they think three months period is the most appropriate. Trainees feed that PC based education should go hand in hand with the ongoing training courses. As for the effect of the quality level of training on the satisfaction of training, it is found that the more interested trainees are in learning, the higher they evaluate the content of training, its technique, educational environment, and quality of instructors. According to the research, the preparation of training, the content and techniques of training, educational environment, the quality of instructors and educational evaluation are major factors which have an effect on satisfaction of the training for the unemployed.
폴리우레탄을 메트릭스로한 액막형 칼륨이온 선택성 전극의 제조 및 특성
유광식,이용탁,강철용,Kwang Sik Yoo,Yong Tack Lee,Chul Yong Kang 대한화학회 1991 대한화학회지 Vol.35 No.2
기존 칼륨이온 선택성 전극의 메트릭스로는 대체로 PVC가 사용되어졌으나, 본 연구에서는 폴리우레탄을 사용하였고, 용매 매개체로는 2-nitropheny-n-alkylate, 감응물질로는 potassium tetraphenyl borate 및 D-18-Crown-6 등을 써서 전극막을 제조하였다. 본 폴리우레탄 메트릭스의 칼륨이온 선택성전극의 수명은 75일로서 PVC 메트릭스의 칼륨이온 선택성 전극에 비하여 한층 더 길었다. 전극전위응답(slope factor)은 직선응답범위(K$^+$ 농도 : $1{\times}10^{-1}\;{\sim}\;1{\times}10^{-4}$ M)내에서 52 mV/decade이었고, 본 전극은 방해이온들 $(NH^{4+},\;Na^{+},\;Li^{+},\;Ca^{2+},\;Mg^{2+},\;Cu^{2+}$)이 존재하는 해수 중의 칼륨이온을 B(Ph)$_4^-$ 표준용액으로 전위차 적정시 종말점을 검출하는데 성공적으로 적용되었다. Previous matrices of potassium ion selective electrodes are generally based on PVC. In this study, however, the electrode membrane was prepared with polyurethane matrix containing potassium tetraphenyl borate as sensing materials and D-18-Crown-6 and 2-nitrophenyl-n-alkylethers as solvent mediator. The average life time of the K$^+$-selective electrode based on polyurethane was 75 days which is significantly longer than PVC based one. The slope factor in linear dynamic range ($1{\times}10^{-1}\;{\sim}\;1{\times}10^{-4}$ M) was 52 mV/decade. The electrode has been successfully applied to find end point in potentiometric titration of K$^+$ with tetraphenyl borate solution in the sea water, even in the presence of several interfering cations$(NH^{4+},\;Na^{+},\;Li^{+},\;Ca^{2+},\;Mg^{2+},\;Cu^{2+}$).