Psychological preferences of trash bins arrangement: 3 trash bins case = Psychological preferences of trash bins arrangement: 3 trash bins case
저자
( Fumitake Takahashi ) ; ( Qiuhui Jiang ) ; ( Shinya Suzuki )
발행기관
학술지명
권호사항
발행연도
2017
작성언어
-자료형태
학술저널
수록면
457-457(1쪽)
제공처
Trash bin or trash containers are daily used to collect wastes in both public and private spaces. Although trash bins are well known and always used tools in our daily lives, little scientific concerns have been paid to trash bins. For example, appropriate management of trash bins is usually based on experiences, not scientific researches. In public spaces, there are usually several trash bins to encourage waste segregation of recyclable and non-recyclable wastes by waste disposers. When three trash bins are set in certain site, they might be used for combustible wastes, incombustible wastes, and recyclable ones like PET bottles, cans,and papers, respectively. In this study, the authors focuses on the arrangement of three trash bins. If the position of trash bins, right, center, and left side in this case, can give some psychological impacts on waste disposers,it might encourage or discourage waste segregation by waste disposers. In this sense, it might be one of important subjects in appropriate management of trash bins. Therefore,the authors investigated psychological preferences of three trash bins arrangement.
Trash bins for combustible wastes (burnable waste; BU), non-combustible wastes (NC), and recyclable wastes are tested. Recyclable wastes are PET bottles (PE) or cans (CA) in each survey. Psychological preferences of trash bin arrangement were scaled by web questionnair using pairwise comparison method with Thurstone's law of comparative judgement. When one pair of three trash bins arrangments like BU-PE-NC and PE-NC-BU was presented to questionees, they selected one that they felt easier and/or more appropriate to segregate wastes. All pairs of trash bin arrangements, 12 pairs in this case, were tested. Each web questionnair was conducted for 2 days and repeated 3 times from Jan. to Mar. in 2017. In eash survey, selection data was collected from 210 persons. Therefore, total 630 data was collected in this study. Gender of respondents were balanced equally. The age of respondents were from 20’s to 60’s and also balanced equally with 10-year interval. Selection ratio of each three trash bins arrangement were converted correspondignly to Z score based on Thurstone’s law of comparative judgement. Higher Z score means higher preference.
Z scores of totally 12 arrangements of three trash bins are shown in Figure 1 (BU-NC-PE) and Figure 2 (BU-NC-CA), respectively. Standard deviations of Z scores were calculated based on analytical results of 3 times web questionnairs and shown as error bar in each Figure. Regardless of recyclable waste type (PE or CA), people clearly prefered trash bin for combustible waste (BU) at left side. The right side is secondary prefered and center position was not prefered (second and third worst). Trash bin for non-combustible wastes (NC) was prefered to be set directly next to BU trash bin. It means that NC trash bin at center position was prefered better than left and right sides. When BU and NC trash bins were set seperately, in particular NC at left side and BU at right sides, the preference of this trash bin arrangement was the worst regardless of PE and CA at the center. This clearly suggests that people prefer sequential arrangement of BU and NC trash bins. Before these surveys, the authors expected that there was no significant difference in preferences of trash bin arrangement or BU trash bin at right side was relatively prefered than center or left side because most people were righthanded. BU transh bin at right side seemed to be easier to dispose of combustible wastes by right hand. However, survey results show that BU trash bin at left side is more prefered than that at right side. The left-to-right direction like text reading might explain such preferece difference. If people prefer to firsty dispose of combustible wastes, next noncombustible wastes, and finally recyclable wastes (PE or CA), the most prefered arrangements (BU-NC-PE and BU-NC- CA) enable the same order of waste disposal along with text reading direction. Further research is necessary to investigate psychological preferences of trash bins arrangement, in particular four or five trash bins arrangement case.
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