검색결과

검색조건
좁혀보기
검색필터
결과 내 재검색

간행물

    분야

      발행연도

      -

        검색결과 22

        1.
        2023.05 구독 인증기관·개인회원 무료
        Radioactive waste generated during nuclear power plant decommissioning is classified as radioactive waste before the concentration is identified, but more than 90% of the amount generated is at a level that can be by clearance. However, due to a problem in the analysis procedure, the analysis is not carried out at the place of on-site but is transported to an external institution to identify concentration, which implies a problem of human error because 100% manual. As a way to solve this problem, research is underway to develop a mobile radioactive waste nuclide analysis facility. The mobile radionuclide analysis facility consists of a preparation room, a sample storage room, a measurement room, a pretreatment room, and a waste storage room, and is connected to an external ventilation facility. In addition, since the automation module is built-in from the sample pre-threatening step to the separation step, safety can be improved and rapid analysis can be performed by being located in the decommissioning site. As an initial study for the introduction of a mobile nuclide analysis facility, Visiplan, a preliminary external exposure evaluation code, was used to derive the analysis workload by a single process and evaluate the exposure dose of workers. Based on this, as a follow-up study, the amount of analysis work according to the continuous process and the exposure dose of workers were evaluated. As a result of the evaluation, the Regulatory dose limit was satisfied, and in future studies, internal and external exposure doses were evaluated in consideration of the route of movement, and it is intended to be used as basic data in the field introduction process.
        5.
        2016.10 KCI 등재 구독 인증기관 무료, 개인회원 유료
        단감 해충의 효과적인 방제를 위하여, 현재까지 주로 화학 살충제가 사용되어 왔으나, 최근 화학 살충제의 과다 사용은 해충 저항성과 농약 잔류 문제라는 심각한 문제를 야기하고 있다. 본 연구에서는 친환경 유기농자재 (Eco-Friendly Organic Pesticides; EFOP)의 주요 단감 해충 인 감꼭지나방과 톱다리개미허리노린재에 대한 살충 활성을 검토하였다. 현재 유통되고 있는 친환경 유기농자재 11 종을 실험실 조건에서 대상 해충에 분무 처리하였다. 대조 약제는 화학 살충제인 buprofezin+dinotefuran (20+15) 수화제를 사용하였다. 감꼭지나방에 대한 유기농자재의 살충 효과를 평가하는 과정에서, 감꼭지나방 유충의 개체수 부족 문제로 인하여 배추좀나방 유충을 1차 실험충으로 사용하였으며, 세 종류의 친 환경 유기농자재를 사전 선발하였다. 선발된 친환경 유기농자재는 목초액 (EFOP-1), 회화나무, 양명아주, 멀구슬나무의 혼합추출물 (EFOP-2), Bacillus thuringiensis subsp. aizawai NT0423 (EFOP-11)이었으며, 선발된 유기농자재의 감꼭지나방 유충에 대한 살충력 실험 결과, EFOP-2 의 처리구에서 생충율이 27.7% (5 일차), 13.3% (7 일차), 6.7% (10 일차)로 가장 높은 살충 효과를 보였다. 톱다리개미허리노린재에 대한 살충 효과 평가에서는 회화나무, 양명아주, 멀구슬나무의 혼합추출물 (EFOP-2, EFOP-9)과 고삼, 데리스의 혼합추출물 (EFOP-10)이 높은 살충 효 과를 보였다. 특히 EFOP-2의 처리구에서 생충율이 20.0% (5 일차), 16.7% (10 일차)로 가장 높은 살충 효과를 보였다. 결론적으로, 친환경 유기 농자재인 EFOP-
        4,000원
        6.
        2016.07 구독 인증기관 무료, 개인회원 유료
        Cross-buying refers to the customer action of buying additional products and/or services from the same provider (Valentin 2004). With the belief that cross-buying enables firms to increase profit from existing customers, firms have steadily placed greater emphasis on cross-selling strategies for profitability. To date, numerous studies show that cross-buying behavior of customers has a positive effect on firm profitability. Business reality, however, offers a different perspective; namely, that high levels of cross-buying may not always be linked to firm profitability. For example, Best Buy (an electronics retailer in the United States) has identified approximately 20% of its customers as unprofitable in spite of them purchasing multiple items (McWilliams 2004). Shah, Kumar, Qu, and Chen (2012) found that customers who persistently exhibit certain types of behavior (e.g., excessive service requests, high levels of returning products, lower levels of revenue growth, promotion maximizers) are unprofitable even though they purchased more than one product category.The aforementioned research implies that cross-buying can exert a negative impact on profitability, thereby calling for further examination of cross-buying behavior. It is conceivable that a repeated purchase propensity (contrasted with a cross-buying propensity) concentrated on a single brand is more profitable. Therefore, our primary objective in this paper is to identify a more beneficial type of customer among those who tend to patronize a limited number of brands versus those who tend to patronize a variety of brands, using a one-dimensional model (brand dispersion index). In addition, the second goal of this research is to investigate the boundary conditions where cross-buying will not lead to an increase in sales (unprofitable cross-buying conditions). As two moderating factors that weaken a customer’s crossbuying propensity and a firm’s sales (frequency and transaction size of firms), we consider (1) promotion dependency and (2) spending limiter condition. We use transaction data that include partners in various industries such as gasoline stations, convenience stores, banks, restaurants, and online shopping malls, covering forty-seven categories. Because multiple partners in many categories are available, this allows us to study whether a customer’s cross-buying level in the current period (t) affects the customer’s purchase frequency and transaction size in the subsequent period (t+1). The observation period for the data set extends over three years. Findings from this study indicate that a high level of cross-buying at period t has a positive impact on increasing customer frequencies and transaction sizes in the subsequent (t+1) period. This means that cross-buying has the potential to increase the firm’s profitability. Customers who show a high level of cross-buying propensity tend to exhibit higher levels of loyalty than customers who concentrated on limited brands. Firms should find ways to induce customers with low cross-buying propensity to increase crossbuying. Regarding moderating effects, promotion dependency and spending growth (decline vs. stagnation), spending growth has a considerable moderating effect on the relationship between cross-buying propensity and a customer’s transaction size. Specifically, the effect of cross-buying on transaction size weakens when spending is shrinking. This result makes an important contribution to cross-buying research. If customers showing a high level of cross-buying do not increase their spending level, they may be merely switching to other brands in the program under a fixed budget. So while the rate of crossbuying seems to increase, profit might not increase. The findings from this study imply that it is crucial to target and motivate customers who tend to use various brands and contribute to sales to do more cross-buying instead of suggesting cross-buying to random customers. The promotion dependency, however, turns out to not have significant moderating effects on the relationship between the customer’s propensity to cross-buying and the customer’s purchase frequency and transaction size. For marketing purposes, it is important to consider which customers are more profitable among those who tend to do cross-buying among multi-brands versus those who tend to purchase repeatedly in a limited number of brands. This research provides a solution with a one-dimensional index, the brand dispersion index. Whether cross-buying is shown to be a positive or negative impact on sales, the results are meaningful in implementing customer relationship management. Regardless of the direction in the level of crossbuying, both directions provide a solution to allocate marketing resources. For instance, if the propensity for cross-buying increases sales, the firm should implement marketing strategies to encourage people to use a variety of brands by adding new brands. If repeat purchases increase sales, the company should concentrate on certain brands that customers use most frequently. In addition, by finding the conditions that do not increase sales (e.g., spending limiter condition), it makes marketing practitioners think that cross-buying does not always bring positive results. Overall, the findings from this study are that it is crucial to motivate and target customers who tend to use various brands and contribute to sales to do crossbuying activity, instead of promoting cross-buying to random customers. Conceptual Framework Figure 1 provides an overview of our framework for the relationship between brand dispersion and visiting frequency and transaction size of customers. Specifically, we hypothesize how customer frequencies and transaction sizes in time t+1 will be influenced by customer brand dispersion levels (the extent that customer transactions occur across a broad range of brands) in time t. In addition, we examine the moderating influence of two customer specific variables: (1) degree of promotion dependency and (2) spending limits.
        3,000원
        7.
        2016.04 구독 인증기관·개인회원 무료
        This study was performed to investigate the content of carotenoid (α-carotene, β-carotene, β-cryptoxanthin, capxanthin, lutein, lycopene, zeaxanthin) and physicochemical characteristics (size, color, dietary fiber, total tannin content) of unripen and ripen persimmons (Diospyros kaki) by seven cultivars. The length of the unripen and ripen persimmons ranged from 40.87-64.75 and 48.80-80.29 cm, the width were from 44.03 to 66.73 and 57.65 to 91.53 cm, respectively. Ripen persimmons were showed in the highest Hunter’s L, a and b values. Total tannin content were resulted of unripen- and ripen persimmons ranged from 7.58 to 19.80 and 2.36 to 5.85 mg/g. Total carotenoid content were from 1.09 to 6.45 and 7.46 to 29.46 μg/g, respectively. From the above results, unripen- and ripen persimmon fruit could be useful for the health functional food.
        8.
        2015.10 구독 인증기관·개인회원 무료
        Bean bug, Riptortus pedestris is an agriculturally serious pest in north eastern Asian countries, damaging to several legumes and fruit trees. Chemical pesticides have been largely used to control the pest but it encounters insecticide-resistance and environmental toxicity issues. Alternatively different mode of action and environmentally sound pest management system can be found in entomopathogenic fungal insecticides. Herein we developed a platform to optimize the fungal production to express their maximum virulence against bean bug, by focusing on solid culture system for thermotolerance, formulation to select effective surfactants to carry the fungal conidia on the cuticles, and relationship between environmental abiotic factors and fungal mortality. First to produce highly thermotolerance fungal conidia, Beauveria bassiana and Metarhizium anisopliae isolates were cultured on several granular cereal substrates, which could be subjected to formulation process. Among the tested media, four media (millet, non-glutinous italian foxtail millet, glutinous italian foxtail millet, brown rice) were superior to the other grains in the spore production and thermotolerance. Next to efficiently deliver the fungal conidia on the cuticles of bean bug, total of six surfactant (CO-2.5, CO-12, LE-7, PE-61, TED-3 and Siloxane) was used to experiment. CO-12 was superior to the other surfactant in mortality of 100 ppm consistence. This work suggests that solid culture system and formulation and application should be seriously considered to reach an optimal level of mortality by inducing their maximum virulence.
        9.
        2015.10 구독 인증기관·개인회원 무료
        Entomopathogenic fungi are facultative microorganisms, dwelling in soil or infecting host insects, and some of the genera have been used as biological control agents worldwide. Collection of fungal isolates should be a platform for the development of highly effective resources, thus in this work we constructed a fungal library using a mealworm pathogenecity-based fungal collection method and further characterized some isolates with high virulence. A phylogenetic three was generated, and of the isolates 17 isolates’ biological features were characterized, such as morphology, spectrum of virulence, cultural characteristics, thermo-stability of fungi, production of biologically active materials, such as enzymes. This work reports an attractive entomopathogenic fungal library including the information of effective isolates in pest management.
        10.
        2015.10 구독 인증기관·개인회원 무료
        The present issue of insect resistance and environmental toxicity of pesticides is triggering deep discussion about the pest management tactics, in which pest monitoring and control activity are mainly involved. Novel control agents, hopefully overcoming the present issues and problems, should be researched and commercially applied to the farm fields. With the monitoring-based research, additionally we have to focus on the control-based, particularly control agent-based research and application. Entomo- pathogenic fungi can used as one of the possible novel control agents once considerations are given to the control of soil- or water-dwelling pests. In our research group, the entomopathogenic fungal library has been constructed using the mealworm-based isolation system, which showed a variety of opportunities of their use in pest control. Important key production technologies including granular formulation have been developed to increase their industrialization. Some entomopathogenic fungal isolates showed high biological performance in the control of rice weevils, western flower thrips and Japanese bettles in field stands. To elucidate the fungal mode of action, a fungal transformation system using AtMT and gene identification tools were established. Recently a more deep study about the relationship between insect and entomopathogenic fungi is be investigated using RNA seq. We suggest that to make the entomopathogenic fungal products be applied to agricultural farm field, R&D of down-stream process should be seriously considered as the key step.
        11.
        2015.10 구독 인증기관·개인회원 무료
        ocust, Locusta migratoria (Orthoptera: Acrididae) is one of the outbreaking pests worldwide and such big occurrence was recorded in 2014, Korea, however little consideration was given to the management strategy of the pest. Herein we established a indoor locust-rearing system and constructed a locust-pathogenic fungal library to further facilitate the resources to be used as possible biological control agents. A locust colony was provided from the National Institute of Agricultural Science and Technology and reared in corn or barley plants at artificially manipulated rooms. The critical developmental stages, such as oviposition, hatching and mating were successfully proceeded. Entomopathogenic fungal granules were treated to the locust (2 g/rearing box), and in 5~7 days mycosis was observed in the membranous cuticles of head, abdomen and legs. In particular JEF-003 (Metarhizium anisopliae), JEF-186 (M. lepidiotae) and JEF-187 (Clonostachys rogersoniana) showed high virulence against the locust. A population of locust was exposed to the entomopathogenic fungal conidia-incorporated soil to investigate the possibility of the fungal isolation from natural soil, which resulted in the pathogenesis in 7~10 days in laboratory conditions. More than 80% of control efficacy was observed in the greenhouse trial of fungal granular application. This work suggests that locust rearing system was successfully established and entomopathogenic fungi can be used to control the migratory locust.
        12.
        2015.10 구독 인증기관·개인회원 무료
        Bean bug, Riptortus pedestris is an agriculturally serious pest in East Asian countries, reducing the value of crop quality and loss of income in agribusiness. Chemical pesticides have contributed to the management of the pest, but nowadays insect resistance limits the use of chemical pesticides, thus alternatively new pesticides with different mode of actions such as entomopathogenic fungi are considered. Beauveria bassiana and Metarhizium anisopliae JEF isolates were collected, identified and assayed against bean bugs in laboratory conditions. Some isolates showed >80% virulence by spray and contact-exposure methods. Supernatant showed different level of enzyme activity including chitinase, Pr1 protease and lipase. The Agrobacterium tumefaciens-mediated transformation generated random transformants and some mutants had reduced virulence. TAIL-PCR of the random transformants revealed virulence-related genes. This work can be a strong platform for the functional genetics of bean bug-pathogenic B. bassiana.
        13.
        2015.04 구독 인증기관·개인회원 무료
        Entomopathogenic Beauveria bassiana and Metarhizium anisopliae are well-known biological control agents worldwide and have high potential in industrialization. However their thermo-susceptibility limits long-term storage under high temperature conditions and high insecticidal activity after application to target pests. Herein we isolated highly virulent isolates, B. bassiana JEF006 and JEF007 and M. anisopliae JEF003 and JEF004, and produced in three grains, such as sorghum, millet and Italian millet as substrates for solid cultures, followed by thermotolerance assays to compare the potential of the three substrates for thermotolerance. The JEF isolates were exposed to dry and wet heat at 50°C and overall conidia were more stable under dry heat condition rather than wet heat. Of the three grains, Italian millet was superior to the other grains in the production of thermotolerant conidia. Additionally Italian millet did not severely aggregated, which enabled air to penetrate into the substrate well compared to the sorghum and millet. JEF isolates were more thermotolerant when they were kept in oil conditions as carriers of an oil-based formulation. This work suggests that Italian millet can be used as an effective substrate to produce more thermotolerant conidia, thus maintaining viability for long times under unfavorable environment and biological activity against target pests.
        14.
        2015.04 구독 인증기관·개인회원 무료
        Bean bug, Riptortus pedestris is an agriculturally serious pest in East Asian countries, reducing the value of crop quality and loss of income in agribusiness. Chemical pesticides have contributed to the management of the pest, but nowadays insect resistance limits the use of chemical pesticides, thus alternatively new pesticides with different mode of actions such as entomopathogenic fungi are considered. Beauveria bassiana and Metarhizium anisopliae JEF isolates were collected, identified and assayed against bean bugs in laboratory conditions. Some isolates showed >80% virulence by spray and contact-exposure methods. The isolates produced high levels of pathogenesis-related enzymes, such as chitinase, Pr1 protease and lipase. The Agrobacterium tumefaciens-mediated transformation generated random transformants and some mutants had reduced virulence against bean bugs, which provided some materials to figure out pathogenicity-related genes in the fungi. Now characterization of flanking region of the integrated fragment is underway and this work may reveal some important genes in the pathogenesis. This work can be a strong platform for the functional genetics of bean bug-pathogenic B. bassiana.
        15.
        2012.06 구독 인증기관·개인회원 무료
        SERPINB3 (also known Squamous cell carcinoma antigen 1, SCCA1) is involved in apoptosis, immune response, cell migration and invasiveness of cells. It has been investigated in various types of squamous cell carcinoma. Therefore we investigated the functional role of SERPINB3 gene in human epithelial ovarian cancer (EOC) using laying hens, the most relevant animal model. In 136 laying hens, EOC was found in 10 (7.4%). We compared the expression and localization of SERPINB3 using RT-PCR, quantitative RT-PCR, in situ hybridization and immunohistochemistry, and SERPINB3 activation was detected in chicken and human ovarian cancer cell lines using immunofluorescence microscopy. Thereafter, we examined the prognostic value of SERPINB3 expression in patients with EOC by multivariate linear logistic regression and Cox’ proportional hazard analyses. In present study, SERPINB3 mRNA was induced in cancerous ovaries (p< 0.01), and it was only expressed in the glandular epithelium(GE) of cancerous ovaries of laying hens. SERPINB3 protein was localized predominantly to the nucleus of glandular epithelium in cancerous ovaries of laying hens, and it was abundant in the nucleus of both chicken and human ovarian cancer cell lines. In 109 human patients with EOC, 15 (13.8%), 66 (60.6%) and 28 (25.7%) of those patients showed weak, moderate and strong expression of SERPINB3 protein, respectively. Strong expression of SERPINB3 protein was a prognostic factor for platinum resistance (adjusted OR, 5.94; 95% Confidence Limits, 1.21-29.15). Therefore SERPINB3 may play an important role in ovarian carcinogenesis and be a novel biomarker for predicting platinum resistance and a poor prognosis for survival in patients with EOC. This research was funded by the World Class University (WCU) program (R31-10056), Basic Science Research Program (2010- 0013078) through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science, and Technology and by the Next-Generation BioGreen 21 Program (No.PJ008142), Rural Development Administration, Republic of Korea.
        16.
        2017.05 서비스 종료(열람 제한)
        Background : This study was carried out to provide basic data for the cultivation of the rare Glehnia littoralis in Korean Midwest. Methods and Results : In Korean Midwest, Glehnia littoralis was distributed at an average dis tance of 36.1m from the shoreline. The average altitude of the emergence area was 4.2m and the average slope was 4.3%. All the Glehnia littoralis grew on the sand of the coastal sand d unes. The average pH of habitat was 8.4, the organic matter content was 0.4%, and the avail able phosphate content was 9.1 ㎎/㎏. The potassium, calcium, magnesium and sodium of exc hangeable cation were 0.09, 9.31, 0.43 and 0.23 cmol+/㎏, respectively. Conclusions : Glehnia littoralis are native to the coastal sand dunes, but when cultivated, it is necessary to extend the range of soil selection.
        17.
        2017.05 서비스 종료(열람 제한)
        Background : This study was carried out to provide basic data for in-situ conservation of the rare Glehnia littoralis in Korean Midwest. Methods and Results : In Korean Midwest, The average number of plants with Glehnia littora lis were 7 taxa in per plot, and Sinduri was the most abundant in 8 taxa among the surveyed areas. The total number of plants that appeared together were 16 taxa including Glehnia littor alis, the plants were Artemisia capillaris, Asparagus schoberioides, Calystegia soldanella, Care x kobomugi, Carex pumila, Elymus mollis, Glehnia littoralis, Imperata cylindrica var. koenigii, Ischaemum anthephoroides, Ixeris repens, Lathyrus japonica, Miscanthus sinensis, Oenothera bi ennis, Rosa rugosa, Vitex rotundifolia and Zoysia macrostachya. Among them, Carex kobomug i (46.3%), Elymus mollis (15.9%), and Imperata cylindrica var. koenigii (11.7%) were the pla nts with an average coverage of more than 10%. The plants that appeared in all 4 sites in th e survey area were Carex kobomugi and Carex pumila. Conclusions : Rare medicinal plant of Glehnia littoralis was required to be in-situ conservatio n with accompanying plants of coastal sand dunes.
        18.
        2016.10 서비스 종료(열람 제한)
        Background : This text was conducted to investigate the fruit type of Camellia japonica in ko rea. Methods and Results : In fruit of Camellia japonica, For fruit length of 24.1~33.0mm was 6 3.7%, and width of 30.1~39.0mm was 60.2%, and weight of 10.1~25.0g was 62.1%. Fruit was near in circle shape, because length/width ratio 0.71~1.00 indicate 79.6%. Seed number of per fruit by weight was also tends to be which is much as fruit is heavy. In correlation b etween each of fruit character, Fruit width showed a positive correlation with the fruit length, fruit weight, seed number. Also, for seed number, the correlation coefficient is the fruit weigh t (0.643**), fruit width (0.640**) was significantly more than the length (0.532**). Conclusions : Camellia japonica was very various size, shape of fruit and seed number of per fruit.
        19.
        2016.05 서비스 종료(열람 제한)
        Background : Curcuma longa L., in the family Zingiberaceae, is distributed in tropical and/or sub-tropical regions mainly in India and China. This species is commonly called turmeric, powder is used as medicinal herbs and/or flavor enhancer. It has been cultivated in southern region mainly Jindo. However, it might be possible to extend cultivation regions due to rise in average temperature. In order to select superior lines based on agronomic characteristics, we analyzed multivariate and estimated selection effects from C. longa germplasm. Methods and Results : The C. longa germplasm were cultivated in an experimental field located in Eumseong, NIHHS, RDA. The harvested roots were investigated in agronomic characteristics included in yield and then considered its relationship among the 9 germplasm by multivariate analysis method. Results from principal component analysis (PCoA) showed that it represented 70.00% and 80.44% accumulated explanation from four and five principal compounds (PC). PCoA was conducted from 9 agronomic characteristics and then correlation coefficient has been showed by analysis between each main component value and agronomic characteristics. Value of the first PC was 2.25, 24.96% explanation of total dispersion, plant height, number of rootlet and weight of rootlet were correlated with a somewhat higher level as 0.41, 0.43 and 0.52. Value of the fifth PC was 0.94, 10.43% explanation of total dispersion, the number of shoots was correlated with a higher level as 0.87. Selection effects with outstanding candidate lines including higher lines were estimated at 126.13% in yield. Conclusion : These data on multivariate based on agronomic characteristics will be give us invaluable breeding information by selection of superior lines.
        1 2