검색결과

검색조건
좁혀보기
검색필터
결과 내 재검색

간행물

    분야

      발행연도

      -

        검색결과 127

        21.
        2022.05 구독 인증기관·개인회원 무료
        Recently, concern regarding disposal of cellulosic material is growing as cellulose is known to produce complexing agent, isosaccharinic acid (ISA), upon degradation. ISA could enhance mobility of some radionuclides, thus increasing the amount of radionuclide released into the environment. Evaluation on the possible impact of the cellulose degradation would be an important aspect in safety evaluation. In this paper, the maximum safe disposal amount cellulose is evaluated considering the disposal environment of silos of 1st phase disposal facility. The key factor governing the impact of cellulose degradation is pH of disposal environment, as cellulose is known to degrade partially at pH above 12.5, and completely at pH above 13. Thus, disposal environment should be analyzed as to determine the extent of degradation. As silos are constructed with large amount of cement, porewater within concrete walls would be of very high pH. However, for high pH porewater to be released into the pores of crushed rock, which is filling up the silos, lower pH groundwater (commonly pH 7) should flow into the silos through the concrete walls. This causes dilution of the high pH concrete porewater, resulting in a lower pH as the silos are filled, reaching to expected pH of 11.8–12.3, which is below cellulose degradation condition. Thus, cellulose degradation is not expected, but to quantitatively evaluate safe disposal amount of cellulose, partial degradation is assumed. Upon literature review, the most conservative ISA concentration, enhancing radionuclide mobility, is determined to be 1.0×10−4 M and to reach this concentration, cellulose mass equivalent to 6wt% of cement of the repository, is required to be degraded. However, this ratio is derived based on complete degradation of cellulose into ISA, so for partial degradation, degradation ratio and yield ratio of ISA should be considered. Commonly, cellulosic material (e.g. cotton, paper, etc.) has degree of polymerization (DP) between 1,000–2,000, and with this DP, degradation ratio is estimated to be about 10%. Furthermore, yield ratio of ISA is known to be 80%. Considering all these aspects, about 1.79×107 kg of cellulose could be disposed, which if converted into number of drums, considering cellulose content of dry active waste, more than 100,000 drums (200 L) could be disposed with negligible impact on safety. Based on the result, negligible impact of cellulose degradation is expected for safety of 1st phase disposal facility. In future, this study could be used as fundamental data for revising waste acceptance criteria.
        24.
        2021.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
        Benthic harpacticoids were collected from the East Sea of Korea. Specimen were identified as members of the genus Robertgurneya Apostolov & Marinov, 1988 based on the following characteristics: the fourth segment of antennule with aesthetasc, antenna with three-segmented exopod, shape of mandible, and P1-P4 armature formula. Robertgurneya donghaensis sp. nov. is morphologically most closely related to R. simulans (Norman & Scott T., 1905) and R. similis similis (Scott A., 1896). However, R. donghaensis is characterized by the rostrum with a pointed tip, caudal rami about as board as the length of its inner edge, the first segment of the P1 endopod much longer than entire exopod, and the P5 exopod with five setae in male. The genus Robertgurneya is reported from Korean waters for the first time.
        4,600원
        36.
        2018.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
        The purpose of this study was to assess cross-generational effects of bisphenol A exposure in benthic copepods, Tigriopus west. Nauplii (<24 hours old) were exposed to graded concentrations of bisphenol A, and toxicity end-points such as survival, development, sex ratio, and fecundity were measured. F1 generations were grown under innoxious conditions, and similarly assessed. Significant differences were observed in development of nauplii and copepodites, between exposed and non-exposed copepods; however, there were no differences in survival of nauplii or copepodites, sex ratio, or brooding rate in parental generation. In contrast, in the F1 generation, there were significant differences between the control group and exposed group in survival and development of nauplii. Length, width, and biomass of parental and F1 generations were reduced in the exposed group compared to the control group. In addition, some deformities, such as swelling of the prosome, abnormally shaped egg sac, and dwarfism were observed after exposure to bisphenol A. So, our study demonstrates that a cross-generation toxicity test and monitoring of morphological deformities in harpacticoid copepods, can be useful for development of potential bioindicators for environmental monitoring, and assessment of chemical impact.
        4,000원
        37.
        2018.07 구독 인증기관 무료, 개인회원 유료
        Introduction Existing studies have revealed various value systems’ relationship to consumer behavior. The factors that have been shown to explain consumer behavior include basic values (e.g., Rindfleisch, Burroughs, & Wong, 2009), consumer worldview (e.g., Saatcioglu & Ozanne, 2013), the dominant ideology of society (e.g., Juhl, Fenger, & Thøgersen, 2017), and political ideology (e.g., Jung, Garbarino, Briley, & Wynhausen, 2017). In this study, we attempted to identify a new, overarching construct that captures individuals’ socioeconomic worldview and then to investigate its impact on consumer behavior. In doing so, we developed a neoliberalism scale and investigated how it relates to consumption-related factors. This neoliberalism construct encompasses individuals’ perspectives on various dimensions, including profit centrism, government intervention, welfare, and self-development. Theoretical development Neoliberalism, as used in this construct, is defined as one’s tendency to support economic liberalizations (e.g., free trade, open markets, financial liberalization, deregulation, globalism, privatization, and private-sector enhancement) and the government’s powerful ruling and legal enforcement to reinforce them even at the expense of significant demographic processes. However, neoliberal individuals otherwise tend to consider the government and political system to be much less efficient and much more oppressive than the competitive market and private sector are. Additionally, they strive to manage everyday life strategically, as if they were innovative entrepreneurs. These individuals believe that one’s success largely depends on his or her own merits and efforts, and thus that inequality or unequal compensation is inevitable in order to achieve efficiency, economic growth, and moral justice (e.g., Peck & Tickell, 2007; Steger & Roy, 2010). Methods We distributed our survey to 374 adults (187 female) who are recruited through a market research firm’s online panel in Korea. Participants’ education levels were as follows: those who have only graduated from high school or have yet to graduate from high school = 20.9%, those who are current college students or have graduated from college = 66%, post-college graduates = 13.1%. Based on the literature on neoliberalism, we generated 54 items to measure neoliberalism tendencies. We initially created 12 dimensions, each of which included between four and six items. The dimensions included belief in economic growth, opposition to government intervention, belief in the inefficiency of the government, opposition to labor unions, opposition to policies that favor the majority, hostility toward social welfare, belief in the need to protect private property, support for globalization, interest in time management, elitism, interest in self-development, and interest in wealth management. We adapted our measures from existing scales, except for perceived social mobility and perceived social inequality, which were measures that we created. We measured long-term orientation (Bearden, Money, & Nevins, 2006), the perceived importance of achievement (Burroughs & Rindfleish, 2002), community values (Burroughs & Rindfleisch, 2002), political cynicism (Kaid, 2002), political liberalism (Mehrabian, 1996), life values (Schwartz, 1992), materialism (Richins, 2004), consumer values (Sánchez-Fernández, Angeles Iniesta-Bonillo, & Holbrook, 2009) and impulsive buying behavior (Rook & Fisher, 1995). Results Using the data from 374 respondents, we conducted an exploratory-factor analysis to examine the factor structure of our neoliberalism scale. The exploratory-factor analysis used a principle-component method with direct oblimin rotation, and the criterion of eigenvalue greater than 1.00 generated an 11-factor solution. This factor solution accounted for 59.83% of the total variance. This study employed the following three criteria to retain factors and items: (a) items with factor loading greater than .4, (b) factors with at least three items, and (c) items that do not cross load on the other factors. The results yielded 32 items that comprise seven factors: interest in economic development, hostility toward welfare, interest in wealth management, distrust in government ability, opposition to labor unions, support for the protection of private property, and interest in self-development. We ran an another exploratory-factor analysis using the same methods and items as before, which confirmed that those items loaded well for the seven factors, explaining 59.37% of the total variance. Each factor—hostility toward welfare, interest in self-development, distrust in government ability, interest in economic development, opposition to labor unions, interest in wealth management, and support for the protection of private property—was found to account for 24.08%, 14.11%, 5.12%, 5.01%, 4.27%, 3.40%, and 3.30% of the total variance, respectively. Additionally, the reliability (Cronbach’s alpha) of each factor was as follows: hostility toward welfare = .87, interest in self-development = .83, distrust in government ability= .62, interest in economic development = .68, opposition to labor unions = .76, interest in wealth management = .75, and support for the protection of private property = .67. Finally, we created the neoliberalism index by averaging these seven factors. There was a significant difference in how survey participants responded to the five factors of the neoliberalism construct used in this study—namely, interest in economic development, interest in self-development, opposition to labor unions, hostility toward welfare, and support for the protection of private property. In general, support for those five factors tended to increase with the age of the individual, such that participants over 50 years old appeared to place the most emphasis on the importance of economic development, self-development, and the need to protect private property, while showing more unfavorable attitudes toward labor unions and government welfare policies compared to younger age groups. Overall, neoliberalism index, which is the average of all seven factors, also demonstrated similar patterns. People seem to agree more with neoliberal values as they age. We examined the correlation between the neoliberalism index and related measures such as perceived social inequality, perceived social mobility, and long-term orientation. Our data revealed a significant and positive correlation between neoliberalism and perceived social mobility (r (372) = .35, p < .01), and neoliberalism and perceived social inequality (r (372) = .23, p < .01). Neoliberal individuals are likely to perceive the society to which they belong as relatively equal and to believe that they can achieve a satisfactory social status as long as they strive to do so. This tendency is well explained by the significant correlation between neoliberalism and long-term orientation (r (372) = .47, p < .01), that of neoliberalism and the perceived importance of achievement (r (372) = .39, p < .01). Neoliberal individuals’ positive attitudes toward their future status appear to encourage them to work diligently for their future achievements and to improve their status. In contrast, a significant correlation with political cynicism (r (372) = .27, p < .01) indicates neoliberal individuals’ distrust in government. It can be also inferred that neoliberal individuals are politically conservative, given that neoliberalism is negatively correlated to political liberalism (r (372) = -.29, p < .01). Finally, this index is positively correlated to community values (r (372) = .32, p < .01). Furthermore, our neoliberalism index was correlated with Schwartz’s general life values (Schwartz, 1992), including efforts toward self-enhancement (r (372) = .41, p < .01), openness to change (r (372) = .28, p < .01), efforts toward self-transcendence (r (372) = .32, p < .01), and interest in conservation (r (372) = .45, p < .01). Highly neoliberal individuals may strive to develop themselves, seek interesting and stimulating experiences on their own, tend to be altruistic, and conform to what has been established. Given that politically conservative individuals have been considered to be less altruistic and less open to change, the current results, which contradict prior assumptions, seem to indicate that neoliberalism is very different from conservatism. Our data indicated that there is a significant correlation between neoliberalism and the five dimensions of consumer values—namely, efficiency (r (372) = .26, p < .01), quality (r (372) = .37, p < .01), social values (r = .30, p < .01), play (r = .27, p < .01), aesthetics (r = .32, p < .01), and materialism (r = .16, p < .01). Individuals with neoliberal views are likely to consider various factors prudently in choosing products and proper places to shop. What matters to them in their consumption would be satisfactory shopping experiences as a whole rather than just the quality of the products for which they shop. It is interesting to note that highly neoliberal individuals are likely to value possessions. Given the significant correlation between neoliberalism, social mobility, and inequality, neoliberal individuals may believe that they can be like others who achieve a better status than they have and perceive that having more possessions is an efficient tool for acquiring a higher social status. Impulsive buying behavior was not significantly correlated with neoliberalism. Self-development, one of the seven dimensions of this neoliberalism construct, is closely linked to an emphasis on efficient time management and self-control. Neoliberal individuals are likely to be more thorough and careful in their decision-making and consumption behavior. Thus, it is not surprising to observe an insignificant relationship with impulsive buying behavior. Discussion We attempted to determine if individuals’ worldview could explain consumption-related phenomenon such as the extent to which they value possessions. The data supported the prediction that neoliberalism is closely linked not only to basic human values (Schwartz, 1992), but also to consumption phenomena, including materialism (Richins, 2004) and consumer values (e.g., Sánchez-Fernández, Angeles Iniesta-Bonillo, & Holbrook, 2009). Although we were unable to make clear casual inferences from correlational findings, our results shed light on future research in the field of materialism and other consumerbehavior phenomenon using this neoliberalism construct. Experimental manipulation of neoliberal tendencies would generate more intriguing results.
        4,000원
        38.
        2018.06 KCI 등재 구독 인증기관 무료, 개인회원 유료
        This study was carried out to investigate the management characteristics and growth performance of L. edodes from the cooling stage to incubation. Bags of different heights and weights are available for bagging. When the medium size of 17x13 cm was used and the size of the inoculation hole was changed from 1/3 to 2/3, the browning period was shortened to 30 days. Mycelial growth was evaluated according to the cooling temperature after sterilization. It was observed to be the highest at 122 mm/15 days at 10 °C and 114 mm/15 days and 117 mm/15 days at 15 °C and 20 °C, respectively. The contamination rate of the sawdust media before inoculation was measured as 0, 4.5x10, 1.3x102, 4.0x103 cfu at 5 °C, 10 °C, 15 °C, and 24 °C respectively. The average of 1.6x108 colony forming units (cfu) of microorganisms was observed in the sawdust that had been piled for six months outdoors. In summer, the sawdust has to be used immediately after mixing. The sterilized medium had an average of 4x103 cfu of microorganisms at 24 °C and 1.3×102 cfu at 15 °C. After 15 days of inoculation in vitro, the growth conditions of the sawdust was the best at 132 mm, followed by grain and liquid. When inoculated with liquid spawn, the moisture content of the substrate should be adjusted between 50% and 55% in advance.
        3,000원
        39.
        2017.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
        Biological efficiency (BE), the ratio of fresh mushrooms harvested per dry substrate weight, expressed as the percentage of Lentinula edodes, also known as shiitake, was determined using the ‘Sanjo 701’ strain stored in the Department of Mushroom at the Korea National College of Agriculture and Fisheries. The mycelia were grown in glass columns with varying levels of moisture content and varying mixing periods of 0.5, 1, 2, and 3 hours. The substrate was sterilized using a steam pressure autoclave sterilizer at normal and high pressure to avoid contamination. The results showed that mycelial growth (126 mm/15 days) was optimized at 55% moisture content. The best mycelial growth of 117 mm/15 days was obtained with 2 hours of mixing time. Normal pressure sterilization yielded better results with mycelial growth of 96 mm/15 days at 100°C compared to 88 mm /15 days with sterilization at 121°C. Mycelial density was higher, i.e. 3(+++), with normal pressure sterilization compared to 2(++) with high pressure sterilization. Furthermore, sawdust mixed with 5% woodchips increased the substrate porosity and yielded higher mycelial growth. Thus, we demonstrated that the optimum harvest or potential increased yield of shiitake can be obtained by modulating moisture content, mixing time, and substrate porosity.
        3,000원
        1 2 3 4 5