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Jin Yong Jeon
Department of Architectural Engineering, Hanyang University, Seoul 04763, Korea

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Journal article
Published: 17 August 2021 in Sustainability
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Response scales in auditory perception assessment are critical for capturing the true responses of listeners. Despite its impact on data, response scales have received the least attention in auditory perception assessment. In this study, the usability of visual analogue scales for auditory perception assessment was investigated. Five response scales (a unipolar visual analogue scale–negated to regular, a unipolar visual analogue scale—regular to negated, a bipolar visual analogue scale–positive to negative, a bipolar visual analogue scale—negative to positive, and a unipolar 11-point scale (ISO/TS 15666:2021)) for auditory perception assessment are presented. Music and traffic noise were presented to 60 university students at two different levels, i.e., 45 and 65 dBA, respectively. A web-based experimental design was implemented, and tablet pads were provided to the respondents to record their responses. The unipolar 11-point scale required the longest response time, followed by the two unipolar visual analogue scales and two bipolar visual analogue scales with statistical significance. All response scales used in this study achieved statistical reliability and sensitivity for the auditory perception assessment. Among the five response scales, the bipolar visual analogue scale (negative to positive) ranked first in reliability over repeated measures, exhibited sensitivity in differentiating sound sources, and was preferred by the respondents under the conditions of the present study. None of the respondents preferred the unipolar 11-point scale. The visual analogue scale was favoured over the traditional unipolar 11-point scale by young educated adults in a mobile-based testing environment. Moreover, the bipolar visual analogue scale demonstrated the highest reliability and sensitivity, and it was preferred the most by the respondents. The semantic labelling direction from negated to regular, or from negative to positive, is preferred over its opposite counterpart. Further research is necessary to investigate the use of response scales for the general public including children and the elderly, as well as that of semantic adjectives and their counterparts for auditory perception assessment.

ACS Style

Wonyoung Yang; Jin Yong Jeon. Usability of Visual Analogue Scales in Assessing Human Perception of Sound with University Students Using a Web-Based Tablet Interface. Sustainability 2021, 13, 9207 .

AMA Style

Wonyoung Yang, Jin Yong Jeon. Usability of Visual Analogue Scales in Assessing Human Perception of Sound with University Students Using a Web-Based Tablet Interface. Sustainability. 2021; 13 (16):9207.

Chicago/Turabian Style

Wonyoung Yang; Jin Yong Jeon. 2021. "Usability of Visual Analogue Scales in Assessing Human Perception of Sound with University Students Using a Web-Based Tablet Interface." Sustainability 13, no. 16: 9207.

Journal article
Published: 13 August 2021 in Sustainable Cities and Society
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This study investigates the compatibility of soundscape evaluation results based on the data-collection protocols proposed in ISO 12913-2, Method A (questionnaire), Method B (questionnaire and open-answer), and Method C (narrative interview), as well as guidelines for evaluating urban soundscapes. We assessed the soundscapes of 10 multi-functional sites in an urban environment through the responses of 50 participants to questions on sound source identification, perceived affective quality, and overall quality. Using virtual reality technology, we reproduced a laboratory environment similar to the actual assessment sites. The responses to sound source identification were similar for each protocol. Regarding perceived affective quality, the “pleasantness-eventfulness model” derived from Method A was also found in the text-mining results of Methods B and C; additional emotional responses were discovered. Regarding overall quality, the preference for each assessment site was similar for each protocol. Method C revealed the influence of non-acoustic factors on soundscape perception. The quantitative data protocol was appropriate for a large group and for deriving a generalized model, whereas the qualitative data protocol was effective for small groups or an in-depth analysis of certain sites. The findings of this study are useful for assessing urban soundscapes and informing urban planning.

ACS Style

Hyun In Jo; Jin Yong Jeon. Compatibility of quantitative and qualitative data-collection protocols for urban soundscape evaluation. Sustainable Cities and Society 2021, 74, 103259 .

AMA Style

Hyun In Jo, Jin Yong Jeon. Compatibility of quantitative and qualitative data-collection protocols for urban soundscape evaluation. Sustainable Cities and Society. 2021; 74 ():103259.

Chicago/Turabian Style

Hyun In Jo; Jin Yong Jeon. 2021. "Compatibility of quantitative and qualitative data-collection protocols for urban soundscape evaluation." Sustainable Cities and Society 74, no. : 103259.

Journal article
Published: 06 August 2021 in Sensors
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(1) Background: Non-invasive uroflowmetry is used in clinical practice for diagnosing lower urinary tract symptoms (LUTS) and the health status of a patient. To establish a smart system for measuring the flowrate during urination without any temporospatial constraints for patients with a urinary disorder, the acoustic signatures from the uroflow of patients being treated for LUTS at a tertiary hospital were utilized. (2) Methods: Uroflowmetry data were collected for construction and verification of a long short-term memory (LSTM) deep-learning algorithm. The initial sample size comprised 34 patients; 27 patients were included in the final analysis. Uroflow sounds generated from flow impacts on a structure were analyzed by loudness and roughness parameters. (3) Results: A similar signal pattern to the clinical urological measurements was observed and applied for health diagnosis. (4) Conclusions: Consistent flowrate values were obtained by applying the uroflow sound samples from the randomly selected patients to the constructed model for validation. The flowrate predicted using the acoustic signature accurately demonstrated actual physical characteristics. This could be used for developing a new smart flowmetry device applicable in everyday life with minimal constraints from settings and enable remote diagnosis of urinary system diseases by objective continuous measurements of bladder emptying function.

ACS Style

Jie Jin; Youngbeen Chung; Wanseung Kim; Yonggi Heo; Jinyong Jeon; Jeongkyu Hoh; Junhong Park; Jungki Jo. Classification of Bladder Emptying Patterns by LSTM Neural Network Trained Using Acoustic Signatures. Sensors 2021, 21, 5328 .

AMA Style

Jie Jin, Youngbeen Chung, Wanseung Kim, Yonggi Heo, Jinyong Jeon, Jeongkyu Hoh, Junhong Park, Jungki Jo. Classification of Bladder Emptying Patterns by LSTM Neural Network Trained Using Acoustic Signatures. Sensors. 2021; 21 (16):5328.

Chicago/Turabian Style

Jie Jin; Youngbeen Chung; Wanseung Kim; Yonggi Heo; Jinyong Jeon; Jeongkyu Hoh; Junhong Park; Jungki Jo. 2021. "Classification of Bladder Emptying Patterns by LSTM Neural Network Trained Using Acoustic Signatures." Sensors 21, no. 16: 5328.

Journal article
Published: 18 July 2021 in Building and Environment
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This study developed guidelines for the design of park environments for urban residents by conducting an overall environmental assessment from the perspective of audio-visual interaction. We collected information about audio-visual stimuli at 18 locations in three urban parks and created an assessment environment within a laboratory using virtual reality. A subjective assessment questionnaire was administered to 30 participants regarding audio-visual elements, perceived affective quality, and overall environmental assessment. Further, soundscape and landscape indices were defined using the audio-visual perception ratio between natural-related elements and traffic/human-related elements. Based on the subjective assessment responses, an environmental perception model using a structural equation model was developed. The results demonstrated that pleasantness should be prioritized over eventfulness. Water-related elements are efficient for increasing pleasantness, while providing greenery-related elements efficiently controls eventfulness. We found that audio-visual satisfaction improves when there is a higher share of water- and greenery-related elements than traffic-related elements. However, regarding the visual perception ratio of the human presence to natural elements, water features were found to be effective as a design factor for visual satisfaction and greenery for sound satisfaction. Considering the importance of human-related elements, we confirmed that designs are needed that will induce an influx of people into parks at an appropriate level to enhance their overall environmental satisfaction. This study's findings are expected to serve as design guidelines and supporting data to create pleasant urban park environments.

ACS Style

Hyun In Jo; Jin Yong Jeon. Overall environmental assessment in urban parks: Modelling audio-visual interaction with a structural equation model based on soundscape and landscape indices. Building and Environment 2021, 204, 108166 .

AMA Style

Hyun In Jo, Jin Yong Jeon. Overall environmental assessment in urban parks: Modelling audio-visual interaction with a structural equation model based on soundscape and landscape indices. Building and Environment. 2021; 204 ():108166.

Chicago/Turabian Style

Hyun In Jo; Jin Yong Jeon. 2021. "Overall environmental assessment in urban parks: Modelling audio-visual interaction with a structural equation model based on soundscape and landscape indices." Building and Environment 204, no. : 108166.

Journal article
Published: 08 July 2021 in Landscape and Urban Planning
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This study investigated the potential restorative (PR) effects of urban soundscapes. To establish a new set of PR criteria for urban environments, this study recreated 10 urban sites in virtual reality, instead of using the typical method of questionnaires. A list of restoration-related semantic terms was derived from narrative interviews of 50 subjects who freely expressed their perceptions of the space. PR criteria were determined based on the derived list and two groups were found: the PR group and potential non-restorative group. The objective characteristics of urban soundscapes—acoustic and visual characteristics and characteristics of moving objects—were analyzed. Participants provided their subjective responses regarding sound source identification, perceived affective quality, and overall quality. The Temperament and Character Inventory-Revised-Short Version and Satisfaction with Life Scale were utilized to analyze participants’ individual characteristics. Based on it, a model was developed to predict whether PR criteria could be satisfied, which was 82.6% accurate (85.9% specificity, 71.8% sensitivity). It was determined that the overall level of preference regarding an urban soundscape is a significant factor in satisfying PR criteria. In particular, the design and planning of urban spaces should aim to reduce a space’s loudness and increase the revisitation rate to promote the restoration of the urban residents’ mental health. Furthermore, for individuals, a trait based on acquired experience has a greater impact on the PR effects of urban soundscapes than innate temperament. This study’s findings can serve as supporting data to design sustainable and health-promoting urban soundscapes.

ACS Style

Jin Yong Jeon; Hyun In Jo; Kounseok Lee. Potential restorative effects of urban soundscapes: Personality traits, temperament, and perceptions of VR urban environments. Landscape and Urban Planning 2021, 214, 104188 .

AMA Style

Jin Yong Jeon, Hyun In Jo, Kounseok Lee. Potential restorative effects of urban soundscapes: Personality traits, temperament, and perceptions of VR urban environments. Landscape and Urban Planning. 2021; 214 ():104188.

Chicago/Turabian Style

Jin Yong Jeon; Hyun In Jo; Kounseok Lee. 2021. "Potential restorative effects of urban soundscapes: Personality traits, temperament, and perceptions of VR urban environments." Landscape and Urban Planning 214, no. : 104188.

Journal article
Published: 01 October 2020 in Sustainability
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In this study, a gypsum board wall was developed using resilient channels to improve sound insulation performance, constructability, and economic efficiency; the effect of the application of the developed wall on skyscrapers and long-term housing, one of the main forms of modern buildings, was also comprehensively evaluated. Resilient channels were inserted and fixed to ensure the constructability was suitable for high-rise buildings. In addition, the sound insulation performance, durability of the wall, CO2 emissions, and life-cycle cost (LCC), which are key elements for economic efficiency, constructability, and sustainability, were analyzed. The developed lightweight gypsum board drywall with resilient channels was compared with a concrete wall as well as a double stud gypsum board wall, which has been most widely used among existing drywalls. The sound insulation performance and durability were evaluated in a laboratory, and the other items were evaluated after constructing the walls in a hotel building with an area of 2956 m2. The evaluation results show that the developed wall exhibited a 3 dB higher sound insulation performance than the concrete wall, even though it was thinner by 50 mm, and the wall secured the grade of “severe duty” (SD) based on the BS 5234-2 standard in durability evaluation, indicating that it can sufficiently replace concrete walls. Moreover, when the developed wall was installed in an actual building and compared with a concrete wall, a 14.7% reduction in construction cost, 59% reduction in CO2 emissions, and 30.4% reduction in the LCC of the drywall, considering even the remodeling and dismantling stages of the building, were observed. Therefore, it was proven that the newly developed resilient channel drywall with improved constructability has significant value in terms of sound insulation performance, economic efficiency, safety, and eco-friendliness.

ACS Style

Kyung Kim; Jin Jeon. Evaluation of Construction Cost, Time, and Sustainable Attributes of Drywalls Supported by Resilient Channels. Sustainability 2020, 12, 8102 .

AMA Style

Kyung Kim, Jin Jeon. Evaluation of Construction Cost, Time, and Sustainable Attributes of Drywalls Supported by Resilient Channels. Sustainability. 2020; 12 (19):8102.

Chicago/Turabian Style

Kyung Kim; Jin Jeon. 2020. "Evaluation of Construction Cost, Time, and Sustainable Attributes of Drywalls Supported by Resilient Channels." Sustainability 12, no. 19: 8102.

Journal article
Published: 25 September 2020 in Building and Environment
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This study focuses on how urban functions influence the soundscape in streets by exploring associations among human behaviors, soundscape, acoustic indicators. On-site soundscape assessments were conducted in eight urban streets located in Seoul employing a soundwalk method. The eight streets were classified into two place functions: central business district (CBD) and commercial areas. Through the soundwalks, acoustic recordings and perceptual responses to soundscapes in the streets were collected. As a human behavioral indicator, crowd density was calculated in the streets. The results showed that place function plays a critical role in soundscape evaluation in urban streets. Pleasantness decreased with increasing Eventfulness on streets in CBD. In contrast, Pleasantness had a positive correlation with Eventfulness on commercial streets. This difference in the correlation could be attributed to the difference in the compositions of sound sources between central business and commercial areas. Traffic noise was the most dominant sound source in CBD, which increased Eventfulness and decreased Pleasantness of the soundscape in the streets. Meanwhile, sounds from human activities contributed to an increase in both Pleasantness and Eventfulness in commercial streets. Predictive models of soundscape reflecting the contexts of CBD and commercial streets were developed using acoustic parameters and crowd density. In the context of CBD, acoustic parameters describing spectro-temporal characteristics of traffic noise were important indicators, whereas crowd density was found to be a critical indicator to predict soundscape in the commercial streets. These findings could help in better understanding the relationships between the soundscape and place functions in urban streets.

ACS Style

Joo Young Hong; Jin Yong Jeon. Comparing associations among sound sources, human behaviors, and soundscapes on central business and commercial streets in Seoul, Korea. Building and Environment 2020, 186, 107327 .

AMA Style

Joo Young Hong, Jin Yong Jeon. Comparing associations among sound sources, human behaviors, and soundscapes on central business and commercial streets in Seoul, Korea. Building and Environment. 2020; 186 ():107327.

Chicago/Turabian Style

Joo Young Hong; Jin Yong Jeon. 2020. "Comparing associations among sound sources, human behaviors, and soundscapes on central business and commercial streets in Seoul, Korea." Building and Environment 186, no. : 107327.

Review article
Published: 27 July 2020 in Building and Environment
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Noise pollution in urban acoustic environment has become considerably serious as cities become overcrowded and ground traffic increases. In particular, high-rise buildings with a hard reflective façade built from glass, stone, and metal are the main causes of increased ambient noise levels. An appropriate architectural design of a building envelope can significantly reduce the noise level acoustically and improve soundscape perceivably. The purpose of this study is to conduct a systematic review of building design elements for better urban acoustic environment based on previous acoustical studies, and to derive building envelope design strategies from the building envelope design elements. The included articles have been grouped into two main categories according to research approach: noise abatement and soundscape. A meta-analysis of noise abatement demonstrated that geometric and material building envelope design elements can reduce outdoor noise levels. Soundscape design elements were extracted from studies conducted during the recent decades. Two traditional acoustic strategies, namely, fragmented and textured surface and increased sound absorbing materials, and two methodological strategies in the upper layers, namely, multisensory design and integrated design strategies, were derived from the building envelope design elements. Vegetation on building envelopes has been found to have good performance in both noise abatement and soundscape performance. Architects and urban planners should consider acoustic aspects, whereas acousticians should consider architectural factors applicable to real buildings. A good urban acoustic environment can be achieved through collaborative efforts among architects, acousticians, urban planners, and others.

ACS Style

Wonyoung Yang; Jin Yong Jeon. Design strategies and elements of building envelope for urban acoustic environment. Building and Environment 2020, 182, 107121 .

AMA Style

Wonyoung Yang, Jin Yong Jeon. Design strategies and elements of building envelope for urban acoustic environment. Building and Environment. 2020; 182 ():107121.

Chicago/Turabian Style

Wonyoung Yang; Jin Yong Jeon. 2020. "Design strategies and elements of building envelope for urban acoustic environment." Building and Environment 182, no. : 107121.

Journal article
Published: 07 July 2020 in Landscape and Urban Planning
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With an emphasis on the role of parks in urban environments, studies on soundscape, which assess sound quality, have focused on human perception. In particular, various studies have been conducted on the relationship between human behavioral characteristics and their sound environment. However, there is still insufficient research on human behavioral characteristics in the context of urban parks. The purpose of this study was to investigate the effect of human behavioral characteristics on perceptions of soundscapes in urban parks. Participants were asked to subjectively evaluate the soundscapes of three parks in Paris, France, using three cognitive stages: indicators (perceived audio and visual elements), emotions (semantic expression), and cognition (overall quality of the park’s soundscape). The human behavioral characteristics that the participants witnessed were categorized into whether there was social interaction, whether people remained in the park or were passing through, and what kind of activities took place. To secure high ecological validity, audio-visual information was provided to the participants using virtual reality equipment. The results demonstrated that sounds made by other people decreased the perceived tranquility or peacefulness while the experience of the park as being dynamic and lively increased. We also found that the primary determinant of park preferences was not the type of human activities but the presence or absence of people.

ACS Style

Hyun In Jo; Jin Yong Jeon. The influence of human behavioral characteristics on soundscape perception in urban parks: Subjective and observational approaches. Landscape and Urban Planning 2020, 203, 103890 .

AMA Style

Hyun In Jo, Jin Yong Jeon. The influence of human behavioral characteristics on soundscape perception in urban parks: Subjective and observational approaches. Landscape and Urban Planning. 2020; 203 ():103890.

Chicago/Turabian Style

Hyun In Jo; Jin Yong Jeon. 2020. "The influence of human behavioral characteristics on soundscape perception in urban parks: Subjective and observational approaches." Landscape and Urban Planning 203, no. : 103890.

Journal article
Published: 20 May 2020 in Building and Environment
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Sound environment is a critical factor to be considered in the development of sustainable and healthy urban communities and cities. We investigated the effect of the appropriateness of the sound environment on urban soundscape perception through individuals' subjective evaluation in a laboratory condition. Our aim was to propose design guidelines to enhance urban soundscape quality. Virtual reality technology was used to simulate a realistic soundscape: visual information was generated via a head-mounted display, and spatial audio information was provided via headphone-based first-order ambisonic head-tracking technology. The appropriateness and perceived degree of sound sources, perceived visual elements, and soundscape quality (such as satisfaction, desire to stay, and comfort) were evaluated with 30 participants in two experimental setups: a visual environment and an audio-visual environment. The results revealed that the appropriateness of the sound sources interacted with individuals' perception of visual elements, and “traffic” sounds and “birdsongs” were critical factors that influenced participants’ initial perception of urban soundscape quality. Further, “human” sounds originating from human activity were related to the “comfort” aspects of soundscape quality. The findings and soundscape design guidelines will be useful for the planning and development of urban soundscapes.

ACS Style

Hyun In Jo; Jin Yong Jeon. Effect of the appropriateness of sound environment on urban soundscape assessment. Building and Environment 2020, 179, 106975 .

AMA Style

Hyun In Jo, Jin Yong Jeon. Effect of the appropriateness of sound environment on urban soundscape assessment. Building and Environment. 2020; 179 ():106975.

Chicago/Turabian Style

Hyun In Jo; Jin Yong Jeon. 2020. "Effect of the appropriateness of sound environment on urban soundscape assessment." Building and Environment 179, no. : 106975.

Journal article
Published: 15 May 2020 in Sustainability
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Illuminance levels have been standardized and regulated for many purposes. However, the effects of correlated colour temperature of lighting have received little attention in the field. This study investigated the effects of correlated colour temperature of lighting on the brightness sensation, lighting perception, and cognitive performance of 60 students under ambient light emitting diodes (LED) lighting conditions (CCT: 3000 K, 4000 K, and 5700 K; illuminance: 650 lx and 1050 lx) in an actual university classroom. An increase in correlated colour temperature (CCT) led to an increase in brightness sensation. However, increased CCT did not linearly increase lighting comfort. A CCT of 4000 K was considered as the optimum for lighting comfort in educational settings. But in comparison to comfort, higher levels of perceptual properties, satisfaction and acceptance were not affected by CCT from 3000 K to 5700 K. Scores on the working memory test were significantly affected by CCT and illuminance level in men only. The effects of gender appeared in glare sensation and the working memory test. Women were sensitive to glare sensation and had a lower mean score in the working memory test than men. Optimal CCT is more beneficial than increased illuminance in moderately ambient indoor lighting, as it provides better lighting comfort. Further research can look at the long-term effects of CCT on lighting perception depending on brain processing levels and more diverse and in-depth cognitive performance.

ACS Style

Wonyoung Yang; Jin Yong Jeon. Effects of Correlated Colour Temperature of LED Light on Visual Sensation, Perception, and Cognitive Performance in a Classroom Lighting Environment. Sustainability 2020, 12, 4051 .

AMA Style

Wonyoung Yang, Jin Yong Jeon. Effects of Correlated Colour Temperature of LED Light on Visual Sensation, Perception, and Cognitive Performance in a Classroom Lighting Environment. Sustainability. 2020; 12 (10):4051.

Chicago/Turabian Style

Wonyoung Yang; Jin Yong Jeon. 2020. "Effects of Correlated Colour Temperature of LED Light on Visual Sensation, Perception, and Cognitive Performance in a Classroom Lighting Environment." Sustainability 12, no. 10: 4051.

Journal article
Published: 13 February 2020 in Sustainability
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This report proposes the stage volume ratio (Vo/V) as an acoustic design factor for concert halls and presents an investigation of the dependence of the acoustic parameters of an auditorium on the stage volume through computer simulation. Firstly, the ratio of the stage volume to the total volume of a concert hall was defined as Vo/V through case studies of existing concert halls. It was verified using a simple model that the stage acoustic parameter STEarly and audience acoustic parameters G and C80 decreased, whereas, the reverberation time and early decay time increased with increasing Vo/V. Secondly, a computer simulation was performed for nine existing concert halls, while changing Vo/V from −20% to 30%. The room acoustic parameters exhibited the same patterns as suggested by the simple model. Vo/V significantly affected the bass ratio and bass index. A comparison of the effects of Vo/V and the sound absorption coefficient in nine concert halls revealed that Vo/V contributed approximately 15% to the reverberation and affected the bass characteristics more substantially. Thus, Vo/V is a critical design factor when determining the warmth of the audience acoustics. The study results could be used as a basis for acoustic design in the future.

ACS Style

Jin Yong Jeon; Rosa Seo; Hyun In Jo. Effect of Stage Volume Ratio on Audience Acoustics in Concert Halls. Sustainability 2020, 12, 1370 .

AMA Style

Jin Yong Jeon, Rosa Seo, Hyun In Jo. Effect of Stage Volume Ratio on Audience Acoustics in Concert Halls. Sustainability. 2020; 12 (4):1370.

Chicago/Turabian Style

Jin Yong Jeon; Rosa Seo; Hyun In Jo. 2020. "Effect of Stage Volume Ratio on Audience Acoustics in Concert Halls." Sustainability 12, no. 4: 1370.

Journal article
Published: 25 November 2019 in Sustainability
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Obtaining the reverberation time of a multipurpose building is most effective when accurate data is used to simulate the building. Therefore, this study proposes a method of measuring the sound absorption coefficient that is close to the sound absorption performance of the conditions in which building materials are actually used. In addition, a sufficient diffusivity evaluation method for sound absorption coefficient measurement in a reverberation chamber is proposed, to address the sound absorption performance difference caused by internal diffusion of the reverberation chamber. When the sound absorption performance was evaluated after installing the specimen under the condition of minimized edge effect, the result obtained should closely match the sound absorption performance of the specimen surface. The sound absorption performance of the specimen ( α β E ≈ 0 ) with minimized edge effect and the sound absorption performance on the specimen surface ( α ∞ ) were proposed as an evaluation indicator of agreement between the values. Experimental results show that diffusion inside the reverberation chamber is enhanced when α ∞ − α β E ≈ 0 < 0.02, for which sufficient diffusion can be assumed inside the reverberation chamber. In addition, to verify the validity of the proposed evaluation indicator, we investigated the relationship with the objective diffusion evaluation indicator for diffuse field configuration in the reverberation chamber, such as relative standard deviation of decay rate ( S r e l ) and Np values. The results of this study are expected to contribute to a more accurate estimation of the sufficient diffusion condition in the reverberation chamber, in evaluating the sound absorption performance of the material, and that inside the reverberation chamber.

ACS Style

Kyung Ho Kim; Jin Yong Jeon. Effect of Diffusion Conditions on Absorption Performance of Materials Evaluated in Reverberation Chamber. Sustainability 2019, 11, 6651 .

AMA Style

Kyung Ho Kim, Jin Yong Jeon. Effect of Diffusion Conditions on Absorption Performance of Materials Evaluated in Reverberation Chamber. Sustainability. 2019; 11 (23):6651.

Chicago/Turabian Style

Kyung Ho Kim; Jin Yong Jeon. 2019. "Effect of Diffusion Conditions on Absorption Performance of Materials Evaluated in Reverberation Chamber." Sustainability 11, no. 23: 6651.

Journal article
Published: 22 July 2019 in Sustainability
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Response scales are widely used to assess the personal experience of sensation and perception in built environments, and have a great impact on the quality of the responses. The purpose of this study was to investigate the effects of response scales on human sensation and perception in moderate indoor environments. Four different response scales were compared under three room temperatures (19.0 °C, 24.5 °C, and 30.0 °C) and five acoustic stimuli (ambient noise, 42 and 61 dBA × water sounds and traffic noise): a bipolar seven-point scale according to ISO 10551:1995, a unipolar 11-point scale according to ISO/TS 15666:2003, these two scales combined for each sensory comfort assessment, and a bipolar visual analogue scale. The degree of relative differentiation based on indoor physical factors made no significant difference across the four response scales. Therefore, the effects of physical factors on human response could be assessed by using any of the four scales tested in this study, with a statistical significance at P < 0.05 in moderate environments. The choice of response scale would depend not only on the type of physical stimulus but also on the question of sensation or perception. The reliability of each response scale was different according to the subjective attributes. The bipolar visual analogue scale was subjectively preferred by the respondents.

ACS Style

Wonyoung Yang; Hyeun Jun Moon; Jin Yong Jeon. Comparison of Response Scales as Measures of Indoor Environmental Perception in Combined Thermal and Acoustic Conditions. Sustainability 2019, 11, 3975 .

AMA Style

Wonyoung Yang, Hyeun Jun Moon, Jin Yong Jeon. Comparison of Response Scales as Measures of Indoor Environmental Perception in Combined Thermal and Acoustic Conditions. Sustainability. 2019; 11 (14):3975.

Chicago/Turabian Style

Wonyoung Yang; Hyeun Jun Moon; Jin Yong Jeon. 2019. "Comparison of Response Scales as Measures of Indoor Environmental Perception in Combined Thermal and Acoustic Conditions." Sustainability 11, no. 14: 3975.

Journal article
Published: 04 January 2019 in Applied Acoustics
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To provide a novel methodology of indoor-noise evaluation by using virtual reality (VR) technology, an auditory test was conducted on water-supply and drainage noises of apartment buildings in different environments, including VR, and the influence of the head mounted display (HMD) was investigated. First, through the analyses of sound pressure level, spectrogram, and sound quality (SQ) for the noise sources of water supply and drainage measured on site, the changes were checked according to time. Furthermore, by targeting the sounds of toilet on the floor immediately below, the allowable endurance limit and annoyance level were evaluated by changing LAeq in four environmental set-ups: headphone, speakers, headphone and HMD, and speakers and HMD. As a result, between the use or disuse of HMD, the allowable endurance limit and annoyance level showed 6% and 8% differences on average, respectively, showing that their sound-pressure levels for 50% annoyance level differed by 2.2 dBA, and they were evaluated as most sensitive in the speakers and HMD setup. In the semantic differential test result, the scale value was evaluated as high owing to the increase in visual information through HMD. In addition, the comparison of respective noise sensitivity groups confirmed that the influence of HMD was very large. Therefore, in this study, it was confirmed that to evaluate the environmental noises in residences under a test laboratory condition, the method of using speakers and HMD simultaneously was effective for implementing a setup similar to actual on-site evaluation.

ACS Style

Jin Yong Jeon; Hyun In Jo; Sung Min Kim; Hong Seok Yang. Subjective and objective evaluation of water-supply and drainage noises in apartment buildings by using a head-mounted display. Applied Acoustics 2019, 148, 289 -299.

AMA Style

Jin Yong Jeon, Hyun In Jo, Sung Min Kim, Hong Seok Yang. Subjective and objective evaluation of water-supply and drainage noises in apartment buildings by using a head-mounted display. Applied Acoustics. 2019; 148 ():289-299.

Chicago/Turabian Style

Jin Yong Jeon; Hyun In Jo; Sung Min Kim; Hong Seok Yang. 2019. "Subjective and objective evaluation of water-supply and drainage noises in apartment buildings by using a head-mounted display." Applied Acoustics 148, no. : 289-299.

Journal article
Published: 28 December 2018 in Building and Environment
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Psychoacoustic experiments were performed to investigate head-related transfer function (HRTF) and head-mounted display (HMD) effects, to develop a new virtual-reality (VR)-based noise assessment methodology and classification method for heavy-weight impact sounds in an apartment indoor environment. Sound pressure levels and frequency characteristics before and after HRTF application were examined to reproduce the “upstairs condition” (overhead movement), for a heavy-weight impact source recorded in an apartment living room. Floor impact noise was assessed using the HMD by modeling a typical living room. For four environments (NONE, HRTF, HMD, and HRTF + HMD), subjective responses (annoyance, allowance limit, semantic expression) were examined for 38–62-dB maximum sound pressure levels with an A-weighted frequency response and fast time constant. Directional information through the HRTF significantly increased annoyance and decreased the allowance limit, and HMD visual information partially (1.2 times) affected the allowance limit in a high inter-floor noise environment owing to increased visual involvement (56 dBA). The semantic expression assessment revealed comprehensive inter-floor noise responses of dissatisfaction, irregularity, and discontinuity, and confirmed greater annoyance due to walking vibration noise in a environment with directional information, because of increased perception of heavy-impact sound-induced discomfort. Regarding annoyance- and allowance-limit-based classification, the satisfaction standards for low-noise environments were assessed as 6–7 dB lower than those of previous studies when both HRTF and HMD were applied, confirming that test subjects respond to noise more sensitively in a virtual environment where audiovisual information is provided. Therefore, a new indoor noise assessment methodology for environmental factors is proposed herein.

ACS Style

Hyun In Jo; Jin Yong Jeon. Downstairs resident classification characteristics for upstairs walking vibration noise in an apartment building under virtual reality environment. Building and Environment 2018, 150, 21 -32.

AMA Style

Hyun In Jo, Jin Yong Jeon. Downstairs resident classification characteristics for upstairs walking vibration noise in an apartment building under virtual reality environment. Building and Environment. 2018; 150 ():21-32.

Chicago/Turabian Style

Hyun In Jo; Jin Yong Jeon. 2018. "Downstairs resident classification characteristics for upstairs walking vibration noise in an apartment building under virtual reality environment." Building and Environment 150, no. : 21-32.

Journal article
Published: 05 December 2018 in Sustainability
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The aim of this study was to explore the relationships among the particle number concentration (PNC), noise, and traffic conditions. Field measurements were conducted to measure the temporal variabilities of the noise levels and PNC over 24 h in a location adjacent to three main traffic roads in Seoul, Korea. The PNC was measured in the range of 0.3 to 10 µm. The noise data was measured by utilizing both the overall levels and spectral characteristics. Traffic data including volumes and speeds of vehicles on the roads were also collected. The results showed that the correlations among the three key parameters varied depending on changes in the noise frequency and particle size. The noise levels at 100–200 Hz were positively correlated with traffic volume and submicron particles. In contrast, they exhibited inverse correlations with the traffic speed and the number of larger particles (>2.5 µm). Compared to noise levels at 100–200 Hz, noise levels at 1–2 kHz exhibited reverse relationships between the traffic and PNC. Submicron particles (0.3–1.0 µm) tended to be more strongly associated with noise levels during the daytime, while those greater than 2.5 µm maintained relatively stable correlations with the noise throughout the day. The findings address the importance of temporal and spectral-specific monitoring of air and noise pollutants for a better understanding of the exposure of the community to air and noise pollution.

ACS Style

Jin Yong Jeon; Joo Young Hong; Sung Min Kim; Ki-Hyun Kim. Noise Indicators for Size Distributions of Airborne Particles and Traffic Activities in Urban Areas. Sustainability 2018, 10, 4599 .

AMA Style

Jin Yong Jeon, Joo Young Hong, Sung Min Kim, Ki-Hyun Kim. Noise Indicators for Size Distributions of Airborne Particles and Traffic Activities in Urban Areas. Sustainability. 2018; 10 (12):4599.

Chicago/Turabian Style

Jin Yong Jeon; Joo Young Hong; Sung Min Kim; Ki-Hyun Kim. 2018. "Noise Indicators for Size Distributions of Airborne Particles and Traffic Activities in Urban Areas." Sustainability 10, no. 12: 4599.

Journal article
Published: 09 November 2018 in Building and Environment
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In this study, a new noise evaluation method is proposed in which virtual reality (VR) technology in the form of a head-related transfer function (HRTF) and a head-mounted display (HMD) is applied to assess the noise experienced inside residential buildings. Firstly, the sound pressure level and frequency characteristics of road traffic noise recorded in a living room were identified before and after applying the HRTF. Secondly, the subjective response was evaluated in terms of loudness, annoyance, disturbance, and allowance for road traffic noise levels LAeq of 40–65 dB in four different test environments, namely, without the HRTF or HMD, with the HRTF, with the HMD, and with both the HRTF and HMD. The impacts of the directional information provided by the HRTF and the visual information provided by the HMD were 77% and 23%, respectively. Furthermore, based on an evaluation of the source- and environment-related spatial attributes, the recognition of road traffic noise was the highest with the HRTF, and the recognition of space was the highest with the HMD. When both the HRTF and HMD were applied, the influence of sound externalization in the VR environment increased along with the sense of immersion and realism. Moreover, the recognition of the noise direction and noise width played a significant role in the psycho-acoustic impact, including the annoyance level of the road traffic noise. The findings of this study provide new insights on the influence of external noise on indoor environments.

ACS Style

Jin Yong Jeon; Hyun In Jo. Three-dimensional virtual reality-based subjective evaluation of road traffic noise heard in urban high-rise residential buildings. Building and Environment 2018, 148, 468 -477.

AMA Style

Jin Yong Jeon, Hyun In Jo. Three-dimensional virtual reality-based subjective evaluation of road traffic noise heard in urban high-rise residential buildings. Building and Environment. 2018; 148 ():468-477.

Chicago/Turabian Style

Jin Yong Jeon; Hyun In Jo. 2018. "Three-dimensional virtual reality-based subjective evaluation of road traffic noise heard in urban high-rise residential buildings." Building and Environment 148, no. : 468-477.

Journal article
Published: 16 October 2018 in Building and Environment
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This study developed an 8-channel microphone array to track the location of a sound source in real time. In addition, a system that implements the GCC–PHAT function as the main algorithm was developed to measure the direction of arrival (DoA) in four spaces with different space volumes and reverberation times (RTs). The developed system exhibited usability in indoor environments with high background noises as it extracted DoA with errors lower than 3° when the signal-to-noise ratio (SNR) was higher than 5 dB for white noise. In addition, as is generally known, the accuracy of a localization system decreases as the space volume and RT increase. However, a higher DoA accuracy was observed in large spaces such as concert halls, in which the RT is high but early reflective surfaces are located far away, compared with that in spaces such as lecture rooms, in which the RT is relatively low and early reflections from nearby furniture and walls. Speech intelligibility was the highest when strong early reflections within 20 dB (compared with direct sound) were formed in the error range of ±3.2°. Furthermore, it was verified that the system was most effective when the frame length, which is a real-time sound source analysis parameter, was 5.8 ms to extract a small amount of operation and the amount of DoA information within the same time period through the evaluation results in the four spaces.

ACS Style

Jong Gak Seo; Jin Yong Jeon. Impact of early reflection on real-time estimation of direction of arrival in different building environments. Building and Environment 2018, 147, 434 -443.

AMA Style

Jong Gak Seo, Jin Yong Jeon. Impact of early reflection on real-time estimation of direction of arrival in different building environments. Building and Environment. 2018; 147 ():434-443.

Chicago/Turabian Style

Jong Gak Seo; Jin Yong Jeon. 2018. "Impact of early reflection on real-time estimation of direction of arrival in different building environments." Building and Environment 147, no. : 434-443.

Abstract
Published: 01 September 2018 in The Journal of the Acoustical Society of America
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This study assessed annoyance response to temporal variations of sound energy of heavy floor impact in apartment buildings by using a virtual reality environment. As for a real moving sound source, the noise of a child running diagonally on the floor was reproduced by applying HRTF to the sound source of a single impact ball. Annoyance was assessed in the acoustic environment where visual information was provided by using HMD and directional information was given by using HRTF. A comparison scale using the equal-appearing interval (EQI) was adopted to reflect the sense of daily life. As a result, when visual information was provided in the VR environment, the annoyance of subjects decreased. On the other hand, directional information was given, the subjects became more sensitive to annoyance. Consequently, annoyance was more affected by the direction of a heavy moving sound source than the visual information. The VR-based environment of this study turned out to be realistic in a pyschoacoustic experiment.

ACS Style

Hyun In Jo; Shahzad Ahmed; Hyun Wook Kim; Chun Ki Seo; Jin Yong Jeon. VR-based realistic assessment of annoyance for the noise of children running in apartment buildings. The Journal of the Acoustical Society of America 2018, 144, 1894 -1894.

AMA Style

Hyun In Jo, Shahzad Ahmed, Hyun Wook Kim, Chun Ki Seo, Jin Yong Jeon. VR-based realistic assessment of annoyance for the noise of children running in apartment buildings. The Journal of the Acoustical Society of America. 2018; 144 (3):1894-1894.

Chicago/Turabian Style

Hyun In Jo; Shahzad Ahmed; Hyun Wook Kim; Chun Ki Seo; Jin Yong Jeon. 2018. "VR-based realistic assessment of annoyance for the noise of children running in apartment buildings." The Journal of the Acoustical Society of America 144, no. 3: 1894-1894.