• Proceedings of the Acoustical Society of Korea Conference
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• autumn
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• pp.523-526
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• 2004

미숙련 작업자들에 의하여 생산되는 라우드스피커의 특성들을 분석하여 제작된 제품들의 품질 신뢰도를 분석하였다. 동일한 부품을 사용한 경우임에도 조립 제작과정에서 누적된 미확인 제작오차에 의하여 발생하는 스피커의 전기 임피던스와 음향응답특성등의 산포도를 분석하였다. 또한, 전기 임피던스 곡선들로부터 T-S 매개변수 규명법으로 규명한 스피커 매개변수들의 산포도도 분석하였다. 부품들의 질량에 대한 실측치와 매개변수법으로 규명한 결과를 비교하여 조립제작과정에서 이 값들의 변화 되는 정도도 분석하였다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2022.01a
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• pp.289-290
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• 2022

본 논문에서는 약을 제 시간에 복용할 수 있도록 도와주는 스마트 약통 서비스를 개발한 결과를 보인다. 라즈베리파이, 자석감지센서, LED, AI스피커와 외부서버를 결합한 구조로 개발하였으며, 사용자는 약을 복용하였는지에 따라 AI스피커를 통해서 약 복용 여부를 물어볼 수 있고 LED를 통해서 아침, 점심, 저녁의 시간에 따라 복용해야 하는 약을 표시해 줄 수 있도록 하였다.

• Fire Science and Engineering
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• v.33 no.1
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• pp.130-137
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• 2019

In this study, the acoustic characteristics of 13 types of emergency broadcasting speakers were tested under the test set-up of UL 2043 and compared. When the sound pressure level of 1 W speakers was compared with speakers with a 15 W output, the SPL of the 15 W speakers was approximately 20 dB higher in some frequency bands. Loudness analysis showed that people can recognize emergency sound from a 15 W speaker twice as loud as the emergency sound from 1 W speakers. The analysis results on the articulation index (room) had an opposite tendency with loudness results, meaning that small speakers can generate clearer sound. Therefore, it is necessary to improve emergency broadcasting speakers to generate louder and clearer sound. Moreover, a performance evaluation standard is needed based on the reasonable and quantitative measurements and evaluations of the acoustic characteristics of the emergency-broadcasting speakers so that a sufficient and clear sound can be generated in various spaces. In addition, it is necessary to establish standards for the clarity of emergency broadcasting in various spaces.

• Information Systems Review
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• v.22 no.2
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• pp.77-99
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• 2020

Smart speaker is a device that provides an interactive voice-based service that can search and use various information and contents such as music, calendar, weather, and merchandise using artificial intelligence. Since AI technology provides more sophisticated and optimized services to users by accumulating data, early smart speaker manufacturers tried to build a platform through aggressive marketing. However, the frequency of using smart speakers is less than once a month, accounting for more than one third of the total, and user satisfaction is only 49%. Accordingly, the necessity of strengthening the user experience of smart speakers has emerged in order to acquire a large number of users and to enable continuous use. Therefore, this study analyzes the user experience of the smart speaker and proposes a method for enhancing the user experience of the smart speaker. Based on the analysis results in two stages, we propose ways to enhance the user experience of smart speakers by model. The existing research on the user experience of the smart speaker was mainly conducted by survey and interview-based research, whereas this study collected the actual review data written by the user. Also, this study interpreted the analysis result based on the smart speaker user experience dimension. There is an academic significance in interpreting the text mining results by developing the smart speaker user experience dimension. Based on the results of this study, we can suggest strategies for enhancing the user experience to smart speaker manufacturers.

• Journal of Korean Association for Spatial Structures
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• v.11 no.1
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• pp.67-75
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• 2011

The present work investigate the effect of sound reinforcement systems on the acoustics of a large dome stadium using a computer simulation. The acoustics of a dome stadium was predicted analyzed by varying room absorption, as well as the configuration of speakers including their directivity, installed height, and numbers. It was found that both D50 and RASTI were improved by increasing room absorption. Larger EDTs were observed according to the increase of room absorption at mid and high frequencies. On the other hand, RT did not show any significant correlation with the changes in room absorption, which might be the effect of a forced linear fitting for non -linear energy decay process. With respect to the speaker configuration, the speech intelligibility of a sound reforcement system installed at higher placed more relied upon their directivity rather than room absorption, Also, lower placing of speakers was found to be effective in decreasing RTs regardless of room absorption.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.12
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• pp.6993-6997
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• 2014

The aim of this study was to experimentally investigate the sound quality characteristics, such as sound deflection, sound pressure level and frequency characteristics of a magnetic type speaker in an anechoic chamber to overcome the sound quality and voice-coil temperature problems. To accomplish this, the sound quality performance of the magnetic type speaker was tested according to the magnetic fluid amount and magnetic field intensity. The sound deflection, sound pressure level, and frequency characteristics were measured using the Smarrt program. As a result, at a magnetic fluid amount of 2.4 ml, the sound deflection and the sound pressure level of the magnetic type speaker were enhanced by comparing with those of the general type speaker. The frequency characteristics and the sound pressure level of the magnetic type speaker were enhanced greatly with increasing magnetic field intensity from 8.06 mT to 9.10 mT. In addition, the sound deflection of the magnetic type speaker was 0.01% lower than that of the general type speaker.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.23 no.6
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• pp.1157-1167
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• 2013

The development of electronic devices has recently led to many problems such as personal information rape and leakage of business information. Conventional loud-speakers have been generally used to output devices. It can be, however, operated as a micro-phone which was abused as a means for eavesdropping since the speaker and microphone have basically the equivalent structure. Most importantly, the general peoples are not aware of the approaching danger about using speaker as microphone. And, traditional eavesdropping detection equipment does not check the attack. In this paper, we demonstrate that there is a serious danger and vulnerability in using loud-speakers since they can be used as eavesdropping devices.

• Journal of Digital Convergence
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• v.18 no.7
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• pp.101-110
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• 2020

Devices that add emotion-specific services or various functions are appearing in AI speakers and related devices. To this end, this study performed topic modeling analysis on the topics of post-purchase texts written by AI speaker users, and compared them with the data collected via survey questionnaires. Furthermore, data on the emotional intelligence of AI speakers and relationship quality were collected from 600 users and analyzed using structural equation modeling. The findings of the study are as follows: First, the analysis results of topic modeling showed that most of the articles mainly mention the functional aspects of AI speakers. Second, emotional intelligence of AI speaker perceived by consumer affected relationship quality, and relationship quality had a positive effect on customer satisfaction. Therefore, this study expands the area of AI research by integrating the concept of emotional intelligence and relationship quality to provide new theoretical and practical implications.

• Broadcasting and Media Magazine
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• v.19 no.1
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• pp.10-21
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• 2014

3D 산업의 발달과 함께 음원을 통해 현장에서 느낄 수 있는 입체감을 재현하는 실감 음향 기술에 대한 관심 또한 증가하고 있다. 정확한 실감 음향을 구현하기 위해서 헤드폰과 스피커 시스템을 이용한 연구가 활발하게 진행되고 있다. 특히 스피커를 이용하는 실감 음향 연구는 초다채널 스피커를 이용하여 물리적 음장 재현을 목표로 하는 방법과 소채널 스피커를 이용하여 사용자의 특성을 적용한 인지적 음장 재현을 목표로 하는 방법으로 나뉜다. 헤드폰과 스피커를 이용한 기존 연구들이 사용하는 기술들에 대해서 알아보고, 기존 기술의 장점과 단점에 대해서 분석해본다. 이를 통해 사용자 맞춤형 실감 음향 기술의 구현을 위한 연구 방향과 새롭게 적용할 수 있는 기술들에 제시하고자 한다.

• Proceedings of the Acoustical Society of Korea Conference
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• spring
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• pp.197-200
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• 2000

본 논문에서는 공간에 위치한 음원으로부터 양 귀에 들리는 음향을 스피커를 이용하여 재현 하는 기술에 대한 문제점과 이를 효과적으로 구현할 수 있는 방법에 대해 소개한다. 좌우 대칭 위치의 스피커를 이용하여, 음상 정위를 실현할 때 직면한 문제점인 Cross-talk 제거와 스피커와 청취자 양 귀사이의 음향전달 모델 선정에 대한 문제점들을 본 논문에서 고찰한다. 이러한 고찰을 통하여 Transaural 필터의 모델 제시와 본 모델의 음향학적 특성을 소개한다. 인간 청각기관의 공간 감응 인자인 lID(Interaural Intensity Difference)와 ITD(Interaural Time Difference)의 개념을 이용한 Transaural 필터의 구현 방법을 제시한다. 제시한 구현방법과 영국 ISVR의 "Stereo Dipole"과의 비교와, 끝으로, 주파수에 따른 적합한 스피커간의 배치 문제에 관한 것도 언급한다.