• Title/Summary/Keyword: disposal behavior

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Review on Methods of Hydro-Mechanical Coupled Modeling for Long-term Evolution of the Natural Barriers

  • Chae-Soon Choi;Yong-Ki Lee;Sehyeok Park;Kyung-Woo Park
    • Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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    • v.20 no.4
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    • pp.429-453
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    • 2022
  • Numerical modeling and scenario composition are needed to characterize the geological environment of the disposal site and analyze the long-term evolution of natural barriers. In this study, processes and features of the hydro-mechanical behavior of natural barriers were categorized and represented using the interrelation matrix proposed by SKB and Posiva. A hydro-mechanical coupled model was evaluated for analyzing stress field changes and fracture zone re-activation. The processes corresponding to long-term evolution and the hydro-mechanical mechanisms that may accompany critical processes were identified. Consequently, practical numerical methods could be considered for these geological engineering issues. A case study using a numerical method for the stability analysis of an underground disposal system was performed. Critical stress distribution regime problems were analyzed numerically by considering the strata's movement. Another case focused on the equivalent continuum domain composition under the upscaling process in fractured rocks. Numerical methods and case studies were reviewed, confirming that an appropriate and optimized modeling technique is essential for studying the stress state and geological history of the Korean Peninsula. Considering the environments of potential disposal sites in Korea, selecting the optimal application method that effectively simulates fractured rocks should be prioritized.

Electrochemical and surface investigations of copper corrosion in dilute oxychloride solution

  • Gha-Young Kim ;Junhyuk Jang;Jeong-Hyun Woo;Seok Yoon;Jin-Seop Kim
    • Nuclear Engineering and Technology
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    • v.55 no.8
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    • pp.2742-2746
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    • 2023
  • The corrosion behavior of copper immersed in dilute oxychloride solution (100 mM) was studied through surface investigation and in-situ monitoring of open-circuit potential. The copper corrosion was initiated with copper dissolution into a form of CuCl-2, resulting in mass decrease within the first 40 h of immersion. This was followed by a hydrolysis reaction initiated by the CuCl-2 at the copper surface, after which oxide products were formed and deposited on the surface, resulting in a mass increase. The formation of nucleation sites for copper oxide and its lateral extension during the corrosion process were examined using focused ion beam (FIB)-scanning electron microscopy (SEM). The presence of metastable compounds such as atacamite (CuCl2·3Cu(OH)2) on the corroded copper surface was revealed by X-ray photoelectron spectra (XPS) and transmission electron microscopy (TEM)-energy dispersive spectrometry (EDS) analysis.

Environmental Perception of Consumers and Clothing Consumption Behavior (소비자의 환경의식과 의생활 행동과의 관련성)

  • 박화순
    • Journal of the Korean Home Economics Association
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    • v.36 no.10
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    • pp.79-88
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    • 1998
  • The purpose of this study is to identify environmental perception of clothing consumption behavior taking socioo-economic variables into account. An instrument, based on previous research was administered to 213 housewives in Taegu area. In analyzing the data, factor analysis, t-test, ANOVA, regression analysis were used. The finding of this indicated that the environmental perception of clothing consumption were significant in purchasing, managing, and disposal of clothing. Among socio-economics variables, income and educational level were found to be significant in explaining the variance of enviromental perception behavior of clothing consumption. The important results of this study are discussed and implications are provided.

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Numerical Analysis of Coupled Thermo-Hydro-Mechanical (THM) Behavior at Korean Reference Disposal System (KRS) Using TOUGH2-MP/FLAC3D Simulator (TOUGH2-MP/FLAC3D를 이용한 한국형 기준 처분시스템에서의 열-수리-역학적 복합거동 특성 평가)

  • Lee, Changsoo;Cho, Won-Jin;Lee, Jaewon;Kim, Geon Young
    • Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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    • v.17 no.2
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    • pp.183-202
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    • 2019
  • For design and performance assessment of a high-level radioactive waste (HLW) disposal system, it is necessary to understand the characteristics of coupled thermo-hydro-mechanical (THM) behavior. However, in previous studies for the Korean Reference HLW Disposal System (KRS), thermal analysis was performed to determine the spacing of disposal tunnels and interval of disposition holes without consideration of the coupled THM behavior. Therefore, in this study, TOUGH2-MP/FLAC3D is used to conduct THM modeling for performance assessment of the Korean Reference HLW Disposal System (KRS). The peak temperature remains below the temperature limit of $100^{\circ}C$ for the whole period. A rapid rise of temperature caused by decay heat occurs in the early years, and then temperature begins to decrease as decay heat from the waste decreases. The peak temperature at the bentonite buffer is around $96.2^{\circ}C$ after about 3 years, and peak temperature at the rockmass is $68.2^{\circ}C$ after about 17 years. Saturation of the bentonite block near the canister decreases in the early stage, because water evaporation occurs owing to temperature increase. Then, saturation of the bentonite buffer and backfill increases because of water intake from the rockmass, and bentonite buffer and backfill are fully saturated after about 266 years. The stress is calculated to investigate the effect of thermal stress and swelling pressure on the mechanical behavior of the rockmass. The calculated stress is compared to a spalling criterion and the Mohr-Coulumb criterion for investigation of potential failure. The stress at the rockmass remains below the spalling strength and Mohr-Coulumb criterion for the whole period. The methodology of using the TOUGH2-MP/FLAC3D simulator can be applied to predict the long-term behavior of the KRS under various conditions; these methods will be useful for the design and performance assessment of alternative concepts such as multi-layer and multi-canister concepts for geological spent fuel repositories.

Typology of Korean Eco-sumers: Based on Clothing Disposal Behaviors (관우한국생태학적일개예설(关于韩国生态学的一个预设): 기우복장탑배적행위(基于服装搭配的行为))

  • Sung, Hee-Won;Kincade, Doris H.
    • Journal of Global Scholars of Marketing Science
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    • v.20 no.1
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    • pp.59-69
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    • 2010
  • Green or an environmental consciousness has been a major issue for businesses and government offices, as well as consumers, worldwide. In response to this movement, the Korean government announced, in the early 2000s, the era of "Green Growth" as a way to encourage green-related business activities. The Korean fashion industry, in various levels of involvement, presents diverse eco-friendly products as a part of the green movement. These apparel products include organic products and recycled clothing. For these companies to be successful, they need information about who are the consumers who consider green issues (e.g., environmental sustainability) as part of their personal values when making a decision for product purchase, use, and disposal. These consumers can be considered as eco-sumers. Previous studies have examined consumers' purchase intention for or with eco-friendly products. In addition, studies have examined influential factors used to identify the eco-sumers or green consumers. However, limited attention was paid to eco-sumers' disposal or recycling behavior of clothes in comparison with their green product purchases. Clothing disposal behaviors are ways that consumer can get rid of unused clothing and in clue temporarily lending the item or permanently eliminating the item by "handing down" (e.g., giving it to a younger sibling), donating, exchanging, selling, or simply throwing it away. Accordingly, examining purchasing behaviors of eco-friendly fashion items in conjunction with clothing disposal behaviors should improve understanding of a consumer's clothing consumption behavior from the environmental perspective. The purpose of this exploratory study is to provide descriptive information about Korean eco-sumers who have ecologically-favorable lifestyles and behaviors when buying and disposing of clothes. The objectives of this study are to (a) categorize Koreans on the basis of clothing disposal behaviors; (b) investigate the differences in demographics, lifestyles, and clothing consumption values among segments; and (c) compare the purchase intention of eco-friendly fashion items and influential factors among segments. A self-administered questionnaire was developed based on previous studies. The questionnaire included 10 items of clothing disposal behavior, 22 items of LOHAS (Lifestyles of Health and Sustainability) characteristics, and 19 items of consumption values, measured by five-point Likert-type scales. In addition, the purchase intention of two eco-friendly fashion items and 11 attributes of each item were measured by seven-point Likert type scales. Two polyester fleece pullovers, made from fabric created from recycled bottles with the PET identification code, were selected from one Korean brand and one US imported brand among outdoor sportswear brands. A brief description of each product with a color picture was provided in the survey. Demographic variables (i.e., gender, age, marital status, education level, income, occupation) were also included. The data were collected through a professional web survey agency during May 2009. A total of 600 final usable questionnaires were analyzed. The age of respondents ranged from 20 to 49 years old with a mean age of 34 years. Fifty percent of the respondents were males and about 58% were married, and 62% reported having earned university degrees. Principal components factor analysis with varimax rotation was used to identify the underlying dimensions of the clothing disposal behavior scale, and three factors were generated (i.e., reselling behavior, donating behavior, non-recycling behavior). To categorize the respondents on the basis of clothing disposal behaviors, k-mean cluster analysis was used, and three segments were obtained. These consumer segments were labeled as 'Resale Group', 'Donation Group', and 'Non-Recycling Group.' The classification results indicated approximately 98 percent of the original cases were correctly classified. With respect to demographic characteristics among the three segments, significant differences were found in gender, marital status, occupation, and age. LOHAS characteristics were reduced into the following five factors: self-satisfaction, family orientation, health concern, environmental concern, and voluntary service. Significant differences were found in the LOHAS factors among the three clusters. Resale Group and Donation Group showed a similar predisposition to LOHAS issues while the Non-Recycling Group presented the lowest mean scores on the LOHAS factors compared to the other segments. The Resale and Donation Groups described themselves as enjoying or being satisfied with their lives and spending spare-time with family. In addition, these two groups cared about health and organic foods, and tried to conserve energy and resources. Principal components factor analysis generated clothing consumption values into the following three factors: personal values, social value, and practical value. The ANOVA test with the factors showed differences primarily between the Resale Group and the other two groups. The Resale Group was more concerned about personal value and social value than the other segments. In contrast, the Non-Recycling Group presented the higher level of social value than did Donation Group. In a comparison of the intention to purchase eco-friendly products, the Resale Group showed the highest mean score on intent to purchase Product A. On the other hand, the Donation Group presented the highest intention to purchase for Product B among segments. In addition, the mean scores indicated that the Korean product (Product B) was more preferable for purchase than the U.S. product (Product A). Stepwise regression analysis was used to identify the influence of product attributes on the purchase intention of eco product. With respect to Product A, design, price and contribution to environmental preservation were significant to predict purchase intention for the Resale Group, while price and compatibility with my image factors were significant for the Donation Group. For the Non-Recycling Group, design, price compatibility with the factors of my image, participation to eco campaign, and contribution to environmental preservation were significant. Price appropriateness was significant for each of the three clusters. With respect to Product B, design, price and compatibility with my image factors were important, but different attributes were associated significantly with purchase intention for each of the three groups. The influence of LOHAS characteristics and clothing consumption values on intention to purchase Products A and B were also examined. The LOHAS factor of health concern and the personal value factor were significant in the relationships with the purchase intention; however, the explanatory powers were low in the three segments. Findings showed that each group as classified by clothing disposal behaviors showed differences in the attributes of a product, personal values, and the LOHAS characteristics that influenced their purchase intention of eco-friendly products. Findings would enable organizations to understand eco-friendly behavior and to design appropriate strategic decisions to appeal eco-sumers.

Consumer consciousness toward well-being and well-being oriented consumer behaviors according to the dietary life -Focused on purchasing, using, and disposal behavior of married women- (웰빙식생활에 대한 소비자인식과 웰빙지향 소비자행동 -기혼여성 소비자의 구매, 사용, 처분행동을 중심으로)

  • Jeon, Hyang-Ran;Jae, Mie-Kyung
    • Korean Journal of Human Ecology
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    • v.16 no.5
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    • pp.957-967
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    • 2007
  • The purposes of this study were to find the sub-factors of consumer consciousness toward well-being and to identify the variables influencing their well-being oriented consumer behaviors in the area of dietary life of married women. 579 married women were surveyed by internet portal site azoomma.com. The collected data were treated with the SPSS Windows 12.0 program and analyzed in terms of frequency, percentage, mean, standard deviation, oneway ANOVA, factor analysis, and multiple regression analysis. The findings were summarized as follow: 1. Consumer consciousness toward well-being has four sub-factors; pro-environmental attitude, personal and family health, means of business, and consciousness regarding others. 2. In the multiple regression analysis, concerns of information, price level, consciousness of personal and family health, health status, educational level explained the purchasing behavior about 25.7%. On the other hand, health status, pro-environmental attitude, consciousness of personal and family health, consciousness regarding others, and concerns of information explanined the using behaviors about 17.0%. Pro-environmental attitude, health status, consciousness of personal and family health, consciousness regarding others, and status of employment were effective variables, and explained the disposal behavior about 19.5%.

The Environmental-Friendly Clothing Consumption Behavior of Middle and High School Students in Seoul (서울지역 중.고등학생의 환경친화적 의복 소비행동)

  • Kim, Ji-Ye;Shin, Hye-Won
    • Journal of Korean Home Economics Education Association
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    • v.24 no.1
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    • pp.37-48
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    • 2012
  • The goal of this research is to determine the variables which influence adolescents' environmental-friendly clothing consumption behaviors. A questionnaire was prepared to survey 768 students in 8 different middle and high schools throughout Seoul. The results of the studies are as follows; First, the experiences in environmental activities were higher than the average. Second, the level of environmental-friendly values was found to be higher than the average. Among the values, environmental-preservation scored the highest, whereas selfishness scored the lowest. Third, adolescents have the strongest desire to express their individuality by means of clothing, which includes comfortableness, price, fashion, and brand. Fourth, the environmental-friendly clothing consumption awareness was average. In this field's subcategory, disposal awareness was above the average. But when buying clothes, the awareness of environmental problems was lower than the common level. Fifth, adolescents were lower in environmental-friendly clothing consumption behavior than the common level. In the subcategory, using behavior and disposal behavior were on the average, but buying behavior was executed in an anti-eco-friendly manner. Sixth, adolescents' price pursuit and clothing disposal consciousness were important factors of environmental-friendly clothing consumption behavior.

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Evaluation of Water Suction for the Compacted Bentonite Buffer Considering Temperature Variation (온도 변화를 고려한 압축 벤토나이트 완충재의 수분흡입력 평가)

  • Yoon, Seok;Go, Gyu-Hyun;Lee, Jae-Owan;Kim, Geon-Young
    • Journal of the Korean Geotechnical Society
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    • v.35 no.11
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    • pp.7-14
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    • 2019
  • The compacted bentonite buffer is one of the major components of an engineered barrier system (EBS) for the disposal of high-level radioactive waste (HLW), and it is considered the best candidate for the buffer material. The buffer is located between disposal canisters and near-field rock mass, and it interrupts the release of radionuclide from disposal canisters and protect them from the penetration of groundwater. At initial disposal condition, degree of saturation of the compacted bentonite buffer decreases because of high thermal quantities released from the disposal canisters. However, the degree of saturation of the compacted bentonite buffer gradually increases caused by inflow of groundwater. The saturated and unsaturated behavior of the buffer is a very important input data since it can determine the safety performance of EBS. Therefore, this paper investigated water retention capacity (WRC) for the Korean compacted bentonite buffer. The WRC of the compacted bentonite buffer was derived by measuring volumetric water content and water suction when temperature variation was between 24℃~125℃ considering decrease of degree of saturation with respect to temperature increase. The WRC was also derived with the same volumetric water content under the room temperature condition, and it showed 1~15% larger water suction than high temperature condition.

A Prediction of Thermal Conductivity for Compacted Bentonite Buffer in the High-level Radioactive Waste Repository (고준위폐기물 처분시설의 압축 벤토나이트 완충재의 열전도도 추정)

  • Yoon, Seok;Lee, Min-Soo;Kim, Geon-Young;Lee, Seung-Rae;Kim, Min-Jun
    • Journal of the Korean Geotechnical Society
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    • v.33 no.7
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    • pp.55-64
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    • 2017
  • A geological repository has been considered one of the most adequate options for the disposal of high-level radioactive waste. A geological repository will be constructed in a host rock at a depth of 500~1,000 meters below the ground surface. The geological repository system consists of a disposal canister with packed spent fuel, buffer material, backfill material, and intact rock. The buffer is very important to assure the disposal safety of high-level radioactive waste. It can restrain the release of radionuclide and protect the canister from the inflow of groundwater. High temperature in a disposal canister is released into the surrounding buffer material, and thus the thermal transfer behavior of the buffer material is very important to analyze the entire disposal safety. Therefore, this paper presents a thermal conductivity prediction model for the Kyungju compacted bentonite buffer material which is the only bentonite produced in Korea. Thermal conductivity of Kyungju bentonite was measured using a hot wire method according to various water contents and dry densities. With 39 data obtained by the hot wire method, a regression model to predict the thermal conductivity of Kyungju bentonite was suggested.