Gil-Soo Jang

Emotional Evaluation According to the Changes of Visual and Auditory Landscape Elements in Residential Areas

This study aims to clarify differences among the responses of users depending on variations in audio-visual landscape elements used to create amenities in residential areas. For the purpose, a laboratory experiment was performed to evaluate the emotions of subjects. As a result of subjective evaluation, it was found that the emotions of subjects were more significantly promoted in providing both sounds and images at the same time, than in providing images alone. In addition, as a result of comparing the variables of relativistic energy alpha waves have by measuring their brain waves, it was seen that alpha waves increased when providing harmonious sound sources with images, except for specific sound sources. Thus, it is considered that provision of sound sources capable of promoting human emotions can contribute greatly to improving the value of space for the sake of comfortable housing environment.

The Environmental Auditory and Visual Information Effects on the Traffic Noise Perception by Using Electroencephalogram

In this study, the influences of environmentally friendly visual and auditory information on traffic noise perception were surveyed by the using electroencephalogram. Green rural region image and CBD (central business district) image in urban city were used as visual informations. And traffic noise, signal and environmental music were used to detect the impact on electroencephalogram variance. It was revealed that green rural region image caused ratio increase about 10% and environmental music increased ratio approximately . The results of this study improved that environmentally friendly visual and auditory information had an effect on decreasing traffic noise loudness to some extents.

An study on the Effects of Visual and Aural Information on Environmental Sound Amenity Evaluation

This study aims to know the effect of road traffic noise perception when the visual and aural information is added in a laboratory experiment. ME (magnitude estimation) and SD (semantic differential method) evaluation on the effect of visual and aural effect were carried out by 43 university students. As the result, up to 10 % of psychological reduction effect was shown under the 65 dB(A). As the noise level, it was analyzed that the vision affected about 7 dB(A) and sound affected 5 dB(A). However, if these two are given simultaneously, mainly sound affects to reduce the annoyance of noise and the vision next. Compared with the urban central circumstances, this effect (2 dB(A) under 65 dB(A) noise) was shown smaller than field test.

Study to Propose the Suitable Reproducing Sound Level of SAFRS

SAFRS(spontaneous acoustic field reproduction system) is a system to sense changes of surroundings and produce sounds which can go well with environment elements sensed by the system in to the space. The sounds were judged by individual evaluation and, the classification of the preferred sounds according to the mood of the space was suggested in the former study. Effectiveness of SAFRS with field application was validated by prior studies which dealt with researching acoustic environment, evaluating images of sounds, and rating environment with existence and nonexistence of sound resources such as fountains and the system after applied in D university. In this study, for more effective field application of SAFRS, research for the acoustic environment around sound resources and subjective evaluation of the preference of the sounds from the resources were made and it was considered that the results of the experiments should be primary information to propose proper sound level to be offered by the system. The results of the study are as follows; 1) It was considered that the ambience of the center road was dependent upon produced sounds by the system and water sounds of the fountain and that of walk way was mostly dependent upon produced sounds. 2) The results of the subjective evaluation showed that the distance from sound resources was suggestive; the more distant from produced sounds the less full and clear the sounds, the less distant from the sounds of water the more delight and idyllic ambience, and the less distant from the forest the more idyllic ambient and diversity. 3) The results upwards were telling that an average value of six elements for the evaluation was even at the place set back 10.2m from center road and walk way. And harmony of all sounds of the place should be considered to propose suitable sound level of SAFRS.

Subjective Assessment of Simulated Heavy Floor Impact Sounds for Alternative Rating Method

This study aims to examine the existing single rating index in terms of level reduction limit of heavy-weight floor impact sound. To achieve this goal, sounds which have same loudness according to rating methods were suggested to subjects. And followings are results. 1) The rating method of measurement frequency level average is more suitable than that of other methods which are dependent on specific frequency for rating heavy-weight floor impact sound. 2) Level average for measurement frequency of is more correspondent to psycho-acoustic response than that of measurement frequency of which is for KS F 2863-2, existing rating method.

An Experimental Study on the Optimistic Recognition Level of Public Address System as a Soundscape Application Facility

P.A.(public address) system is considered as an useful active soundscape appliance which can gives a place identity and vitality by introducing conventional musics, environmental musics, bird singing sounds etc. In this study, the main aim is to know the optimistic distance from the speaker and sound pressure level range of introducing sound. So, the sound pressure level of P.A. system due to distances were measured and subjects` responses with level variations were checked. The main results are as follows. Level range from 64 dB to 71 dB is comfortable for subjects. And the optimal level of introducing sound is related with sound source characteristics. The results of this study could be used for street furniture location design and P.A. system output level.

An Experimental Study on the Recognition Region of Passive Soundscape Facilities Especially in Fountains

The interaction between people and sound and the way how people consciously perceive their environment are central approach to soundscape research. In this respect, this paper aims to clarify the relationship between water-sound level and recognition region in urban area. As a passive soundscape facility, fountain is a useful way to give place such as public square, park identity and vitality. In this study, to know the optimistic distance and sound level range from fountain, sound levels due to distance were measured and subject responses were checked by questionnaire. As a result, levels from 63 dB to 67 dB were recommended by subjects and moving forward to fountain less satisfactory than backward. Moving forward 5 m and backward 5 m(total range 10 m): there was a difference in satisfaction ratio by 2,5 out of 10. The results of this study could be used for street furniture location design and P.A. system output level.

Acoustic Amenity Factor of Urban Environmental Sound for the Ecological Soundscape

The assessment of an urban site depends on the way whether it responds to multiple needs such as functionality, aesthetic and complex comfort of acoustic, thermal, lighting and air quality etc. This study aims to investigate the assessment of various urban soundscapes in the sense of acoustic amenity by the questionnaires. As a result, acoustic amenity assessment was influenced by the non-acoustic factors such as environment assessment of visual, thermal, air quality etc. In the sense of sound quality, urban environmental sound was interpreted as 3 factors of strength, evolution of time, spacial localization. So these factors would be considered in the new assessment method for acoustic amenity. And it was shown that the subjects tend to perceive the noise level less than according to the urban landscapes under the similar noise exposure level.

The Selection of the Scenery and Sound as the Environmental Friendly Elements

In this research, the test how the evaluation of the spacial image influenced by the environmental friendly elements included in the visual information, and how the selection of the sound changed depending on the characteristics of spacial image were carried out by the 40 subjects. Vast tracts of green land and the waterfront were highly preferred and impressive than the other spaces. The green music, signal with water sound and bird chirping sound were highly scored. In the frequency characteristics of the factors, the first factor was artificial sound (high at the low frequency band), the second was natural sound(uniform at all frequency band) and the third was water sound (high at the middle and high frequency band over 500 Hz) . This shows that the proposal of the sound which has the frequency characteristics fit to the spacial image should be selected for the soundscape of the target space.