• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2008.04a
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• pp.727-734
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• 2008

This research presents a laboratory study about difference of subjective response between with and without pictures. A main source is impulsive sound caused by leisure shooting. The sources are sampled from outdoor noise and their levels range from 40 to 75 dB at the interval of 5dB. The noise unit is based on A-weighted sound exposure level (ASEL; $L_{AE}$). To make equal ASEL of outdoor noise, finite impulse response (FIR) filter is applied to the originally sampled source to include the effect of distance attenuation. The evaluation method of the jury test adopted a Semantic Difference(SD) Method. The intersection point which two lines crossed was used as reference point. The intersecting point of mean response rating between with and without pictures was approximately 44ASEL and that of %HA was about 60ASEL. In the result of the test, the negative effect of pictures was given at a lower levels than intersection point while the positive effect was given at a higher levels than that.

• The Journal of the Acoustical Society of Korea
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• v.19 no.8
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• pp.22-25
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• 2000

In this paper, we examine the characteristic of samulnori by the sound analysis techniques. Four instruments of samulnori are constituted with the dual principle of the negative and positive (the male and female) which mean the harmony of each instruments high and low sounds. These sounds are covered the audible whole sounds. Since the fundamental frequencies of jing and janggu sounds are similar to the fundamental frequencies of male and female speech respectively, we feel the affection when we hear the sounds of jing and janggu. Additionally, since human feels the sound not only by ears, but also by the vibration to the skin, the put jing and janggu have the remarkable characteristic of the vibration.

• The Journal of the Acoustical Society of Korea
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• v.32 no.1
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• pp.1-13
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• 2013

Salinity does not generally affect sound speed because it shows very small variations in the ocean. However, low salinity water appears in the Western Sea of Jeju Island every summer so that sound speed and sound propagation can change near sea surface. We calculated Sound Speed Profile (SSP) using vertical profiles of temperature and salinity, which were averaged over years of normal salinity and low salinity (<28 psu) from 30 years (1980~2009) at 3 sites of Korea Oceanographic Data Center (KODC). As a result, sound speed variation by low salinity alone was -5.36 m/s at sea surface and -1.35 m/s at 10m depth for low salinity environments. Gradient of SSP was positive down to 5 m depth due to decrease of sound speed near surface, leading formation of haline channel. Simulation of acoustic propagation using a ray model (Bellhop) confirmed the haline channel. Haline channel has formed 4 times while hydrostatic channel controlled by only pressure has formed 9 times for 30 years. The haline channel showed larger critical angles of rays than hydrostatic channel. Haline channel was also formed at some sites among 20 measurement sites in low salinity water mass which appeared on August $1^{st}$ 2010.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 2001.05a
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• pp.219-224
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• 2001

본 연구에서는 개인의 성격이 소리자극에 의하여 유도되는 감성에 미치는 영향을 조사하기 위하여 대학생 450명(남자: 210명)을 대상으로 행동활성화체계(BAS)와 행동억제체계(BIS) 민감성의 고저에 따라 두 집단을 추출하여 안정상태에서 전전두엽(PFC)의 비대칭적 활성화를 측정한 뒤, 긍정감성과 부정감성을 각각 유발하는 소리들을 제시하여 느끼는 감성에 대한 심리반응 변화를 평가하고 이에 따른 전전두엽의 비대칭적 활성화의 변화를 관찰하였다. 긍정감성과 부정감성을 유도하는 소리는 명상음악과 소음을 각각 사용하였으며 안정상태와 음향청취상태에서의 전전두엽 영역 활성화를 관찰하기 위하여 F7와 F8 부위에서 EEG의 알파밴드(8-13 Hz) 활성도를 분석하였다.

• Journal of Information Technology Applications and Management
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• v.23 no.3
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• pp.87-97
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• 2016

This paper proposes a fast sound source localization method using a TDOA sign-based algorithm. We present an L-shaped microphone set-up which creates four major regions in the range of $0^{\circ}{\sim}360^{\circ}$ by the intersection of the positive and negative regions of the individual microphone pairs. Then, we make an initial source region prediction based on the signs of two TDOA estimates before computing the azimuth value. Also, we apply a threshold and angle comparison to tackle the existing front-back confusion problem. Our experimental results show that the proposed method is comparable in accuracy to previous three microphone array methods; however, it takes a shorter computation time because we compute only two TDOA values.

• Hwankyungkyoyuk
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• v.20 no.3
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• pp.102-112
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• 2007

The purpose of this study is to examine the environmental worldviews of middle school students. An instrument to survey environmental worldviews consists two components; 'Human and Environment', and 'Human Behaviors and Environmental Problems' The two components are three environmental worldviews as follows: 'Technocentrism', 'Ecocentrism', 'and Environmentally Sound and Sustainable Development(ESSD)'Subjects were 551 middle school students in metropolitan area and rural district(male: 285, female: 266). Most of middle school students had the environmental worldview of the ESSD. More female students had a tendency ESSD worldview than males. More male students had the positive Technocentrism than females. More middle school students in metropolitan area had ecocentrism than those in rural district. Understandings of students' environmental worldviews will be helpful to work out teaching and learning strategies in environmental education.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2003.11a
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• pp.778-783
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• 2003

The problem considered in this paper is about the collocation of sensor and actuator for the active control of sound and vibration. It is well-known that a point collocated sensor-actuator pair offers an unconditional stability with very high performance when it is used with a direct velocity feedback (DVFB) control, because the pair has strictly positive real (SPR) property. In order to utilize this SPR characteristics, a matched piezoelectric sensor and actuator pair is considered, but this pair suffers from the in-plane motion coupling problem with the out-of$.$plane motion due to the piezo sensor and actuator interaction. This coupling phnomenon limits the stability and performance of the matched pair with DVFB control. As a new alternative, a point sensor and piezoelectric actuator pair is also considered, which provides SPR property in all frequency range except at the first resonance in very low frequency. This non-SPR resonance could be minimized by applying a phase lag compensator.

• Proceedings of the Acoustical Society of Korea Conference
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• 1994.06a
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• pp.686-691
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• 1994

For evaluating the response fluctuation of the actual environmental acoustic system excited by arbitrary random inputs, it is important to predict a whole probability distribution form closely connected with evaluation indexes Lx, Leq and so on. In this paper, a new type evaluation method is proposed by introducing three functional models matched to the prediction of the response probability distribution from a problem-oriented viewpoint. Because of the positive variable of the sound intensity, the response probability density function can be reasonably expressed theoretically by a statistical Laguerre expansion series form. The relationship between input and output is described by the regression relationship between the distribution parameters(containing expansion coefficients of this expression) and the stochastic input. These regression functions are expressed in terms of the orthogonal series expansion and their parameters are determined based on the least-squares error criterion and the measure of statistical independency.

• International Journal of Advanced Culture Technology
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• v.8 no.4
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• pp.77-81
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• 2020

Recently we have lots of Youtube contents and their influence. But Just a few Studies have announced Youtube content's effect. The purpose of this paper is to see if ASMR content, which is popular through Youtube recently, helps teenagers stabilize their minds and improve their learning abilities. To that end, a survey of teenagers found that ASMR content is very familiar to teenagers, and that 66.7 percent of teenagers use ASMR content for sleep and learning. About the change before and after watching, half of the respondents said they felt a positive difference in learning and psychological stability. As a result, ASMR is a significant content for teenagers with a specific purpose. Therefore, policies such as 'after-school' in terms of school education are proposed as alternatives rather than unilateral measures such as banning ASMR content to teenagers.

• Journal of the Korean Society of Earth Science Education
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• v.7 no.3
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• pp.327-337
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• 2014

In this research, a subject substitute STEAM program was developed in context of a trend of STEAM education and a new science contents in a 2009 revised curriculum, which can replace the 2009 revised curriculum contents of 'Sound' unit in the third and the fourth grade. The developed program was taught to the 4th graders in a field. After applying the program, how students acknowledge the subject substitute STEAM program was analyzed through questionnaire. The research results were as follows. First, the subject substitute STEAM program of 3 sub programs was developed with centered around 'sound' unit for 4th graders. Second, students made a positive estimation of the STEAM program because of various activities and learning subject related to daily life. Third, they considered difficult term, necessary craft skills in creative design, understanding scientific principle and a lot of necessary time as difficulties of the STEAM program. And they also recognized that making stuff activity and learning aid material like activity sheet, picture and video helped to understand a lesson. Lastly, students had a positive thinking or negative thinking about STEAM program before they learn. But after learning the STEAM program, all of them showed their positive attitude to the STEAM program.