• Title, Summary, Keyword: Recyclable

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A Study on the Origination of Backcountry Litter in Moaksan Provincial Park (모악산도립공원의 산쓰레기 발생특성)

  • Rho, Jae-Hyun;Huh, Joon
    • Journal of the Korean Institute of Landscape Architecture
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    • v.35 no.5
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    • pp.64-72
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    • 2007
  • This study investigated the types, forms, and origination of litter found along one hiking course in Moaksan Provincial Park, 'Jungin-ri Course'(entrance-ridge-valley-peak). In addition, a survey was conducted to understand hikers' litter control awareness in order to determine possible backcountry litter control measures. The following are the results of this study: 1. For the litter Sequency investigation, 199 recyclable pieces of litter were found on the mid-slope(61.6%), 89 by the entrance(27.6%), 19 in the valley(5.9%) and 16 on the peak(4.9%). A total of 323 pieces of litter were found. Paper materials were the most common, followed by plastic containers such as PET bottles and yogurt containers. Of particular interest, 288 papers and cans were found on the mid-slope(46.9%). By the entrance, more plastics and bottles were found. 2. There were 614 pieces of flammable litter collected and only 19 pieces of non-flammable. Most of the flammable litter, including snack pacts, plastic bags, processed lumber, cigarette butts, tissues, cigarette boxes, and fabric was found on the mid-slope. 3. Very little food waste was found throughout the whole site proving that the policy prohibiting hikers from cooking and eating at the designated sites has been effective. However, food waste is difficult to find because it naturally decays with time. 4. $X^2$-test was used to find different types of litter and their verified origination frequency. It was found that recyclable litter, and food waste took about 1%. In addition, recyclable litter, especially bottles, was found relatively frequently by the entrance. Flammable litter was found most often at the peak. 5. The questionnaire results showed that 48.2% of the respondents "shorten their hiking journey and purchase food outside the entrance" and 29.6% said that they "bring a packed meal from home". Only 8.2% said that they "cook something when an appropriate location is found". At the Jungin-ri course, a few hikers brought their own food to eat or cook, but most hikers purchased something to eat onsite. 6. The results of the question about having experience littering while hiking showed that 19.3% litter and 79.2% do not. Those that responded "yes" gave various reasons for littering. 63.6% claimed, "there are no designated trash containers". 15.9% said they litter subconsciously. Finally, 3.2% insist that they litter "because food naturally decomposes". 7. As a result of the overall satisfaction according to the Likert scale and the analysis with an average of 14 variables, it was found that the average "toxic litter control convenience" was 2.41 with very low satisfaction. Thus, the results indicate the importance of providing appropriate back country litter control facilities.

Disassemblability Evaluation Method & Application using Axiomatic Approach (정보공리적 분해성 평가 방법과 적용)

  • Kim, Young-Kyu;Cho, Kyu-Kab;Cha, Sung-Woon;Jeong, Sang-Jin;Kweon, Sung-Woo
    • IE interfaces
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    • v.14 no.2
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    • pp.158-163
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    • 2001
  • The paper describes disassemblability evaluation method using axiomatic approach. In recent industry, it is necessary to develope high recyclable environmental product due to green consumer and environmental regulations. Disassembly stage is prior to recycling. Disaassembly time data is determined previously in order to calculate the disassembly segments and disassembly sequence. In this paper the evaluation method of disassembly segment/sequence and disassembly time database are suggested. A case study of monitor product was showed.

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Preparation and characterization of Poly (ethylene terephthalate) (PET) (가지 달린 poly (ethylene terephthalate) (PET)의 제조와 물성에 관한 연구)

  • Kim, Soochan;Park, Sungshin;Sooyun Jung;Kim, Jungsoo;Seungsoon Im
    • Proceedings of the Korean Fiber Society Conference
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    • pp.203-204
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    • 2003
  • Generally, polymeric foam has many advantages, such as light-weight, good impact absorptivity and adiabatic properties. Poly (ethylene terephthalate) PET has good recyclability and no toxicity. Hence, if we make foam of PET, it could be used for various applications such as heat insulating material, recyclable packing material, and food vessel. Thus these properties are attractive interests to manufacturers. (omitted)

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Finite-element modeling and analysis of time-dependent thermomechanical distortion of optical sheets in a LCD module

  • Lee, Jae-Won;Hwang, Hak-Mo;Chung, In-Jae
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.1436-1441
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    • 2006
  • Each type of optical sheets in a LCD module experiences a characteristic behavior for thermal loading and unloading. During thermal cycling, a polymeric behavior is reversible and recyclable, depending on a material stiffness critically affected by temperature and time. Some critical issues on temperature- and time-dependent themomechanical deformation of the polymeric sheet are addressed by finite-element thermal results, followed by structural simulation results in this study.

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Montmorillonite K-10 Clay as an Efficient Reusable Heterogeneous Catalyst for the Solvent-Free Microwave Mediated Synthesis of 5-Substituted 1H-Tetrazoles

  • Marvi, Omid;Alizadeh, Abdolhamid;Zarrabi, Saeid
    • Bulletin of the Korean Chemical Society
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    • v.32 no.11
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    • pp.4001-4004
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    • 2011
  • Various 5-substituted 1H-tetrazole derivatives were synthesized in a simple and environmentally benign method from the reaction of aryl and benzyl nitriles with sodium azide in solvent-free media using montmorillonite K-10 clay as solid recyclable heterogeneous acidic catalyst and microwave irradiation in good yields and short reaction times.

Osmylated Macroporous Cinchona Alkaloid Resins: Highly Efficient and Recyclable Catalysts for Asymmetric Dihydroxylation of Olefins

  • Park, Yil-Sung;Jo, Cheon-Hee;Choi, Han-Young;Kwon, Eun-Kyung;Song, Choong-Eui
    • Bulletin of the Korean Chemical Society
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    • v.25 no.11
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    • pp.1671-1675
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    • 2004
  • A simple method for simultaneous recovery and reuse of $OsO_4$ and alkaloid ligand in the asymmetric dihydroxylation of olefins has been developed by using macroporous alkaloid resins bearing residual vinyl groups.