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        검색결과 336

        241.
        1983.06 KCI 등재 구독 인증기관 무료, 개인회원 유료
        본(本) 시험(試驗)은 혼파초지(混播草地)에 있어서 Italian ryegrass(Lolium multiflorum)의 파종비율(播種比率)과 예취빈도(刈取瀕度)가 첫번째 수확년도(收穫年度)의 목초(牧草) 총(總) 건물생산량(乾物生産量) 식생(植生) 구성비율(構成比率)에 미치는 영향(影響)을 구명(究明)하기 위(爲)하여 수행(遂行)되었다. Italian ryegrass의 파종량(播種量)을 10a 당(當) 0.3kg 및 1.0kg으로 하여 주구(主區)로 하
        4,200원
        243.
        2020.10 KCI 등재 SCOPUS 서비스 종료(열람 제한)
        This study examines how the health of the banks in ASEAN-3 countries namely Indonesia, Malaysia and Thailand respond to the change in exchange rates and foreign interest rates in four large economies. The transmissions of the two external factors through domestic factors in each ASEAN-3 countries eventually affects Non-Performing Loan (NPL) of commercial banks. This study uses the monthly time series data and the renowned Structural Vector Autoregressive (VAR) model comprising five variables, namely exchange rate, foreign interest rate, domestic interest rate, money supply, and non-performing loan (NPL). The results indicate that there are different effects between ASEAN-3 countries, which can be classified as short-run effect and long-run effect. In the long run effect, external factors have a dominant role in determining NPL in ASEAN-3 countries. Yuan has the biggest effect on Malaysia’s NPL, while Indonesia is more affected by European interest rates rather than the fluctuation of the US currency and China’s interest rates. Among ASEAN-3 countries, Malaysia is the one that is the most vulnerable to external factors. While Thailand’s NPL is affected dominantly by domestic factors. This study shows that the Fed Funds Rate (US official interest rate) is not always the dominant factor affecting the health of domestic banks in ASEAN-3.
        244.
        2019.05 KCI 등재 SCOPUS 서비스 종료(열람 제한)
        The paper aims to test long-term and short-term causality from four exchange rates, the Korean won/$US, the Korean won/Euro, the Korean won/Japanese yen, and the Korean won/Chinese yuan, to the Korea Composite Stock Price Index in the presence of several macroeconomic variables using monthly data from January 1986 to June 2018. The results of Johansen cointegration tests show that there exists at least one cointegrating equation, which indicates that long-run causality from an exchange rate to the Korean stock market will exist. The results of vector error correction estimates show that: for long-term causality, the coefficient of the error correction term is significant with a negative sign, that is, long-term causality from exchange rates to the Korean stock market is observed. For short-term causality, the coefficient of the Japanese yen exchange rate is significant with a positive sign, that is, short-term causality from the Japanese yen exchange rate to the Korean stock market is observed. The coefficient of the financial crises i.e. 1997-1999 Asian financial crisis and 2007- 2008 global financial crisis on the endogenous variables in the model and the Korean economy is significant. The result indicates that the financial crises have considerably affected the Korean economy, especially a negative effect on money supply.
        245.
        2018.11 KCI 등재 SCOPUS 서비스 종료(열람 제한)
        The study is aimed at investigating the main factors that affect the interest rate yields, in the long-term. In addition, the study surveys the theories and literature relating to the determinants of interest rate. The importance of which is essential not only for governments, but also for banks and corporate financial risk management decisions, including risk exposures in banks and capital markets. Interest rate influences corporate profit as well as growth. For this purpose, the study examines the impact of budget deficit, risk-free rate, capital inflows, money supply and business cycles on real interest rate in Jordan. These factors are based upon well-established theories and straightforward practical view as interest rate determinants. Using data for (1990-2015), the study employed Johansen’s co-integrating test, which takes into consideration the long-term unsynchronized relationships. The data is tested for normality, symmetric correlations, covariance diagonal and unit root. The results show that the government budget deficit, short-term risk-free interest rate, capital inflows, money supply and business cycle are long-term determinants of the real interest rate in Jordan. The coefficients of government budget deficit, short-term risk-free rate, money supply and business cycle all are inversely affecting the real interest rate, while capital inflows has a positive impact on the real interest rate.
        246.
        2018.10 KCI 등재 서비스 종료(열람 제한)
        Riverbank Filtration (RBF) is a kind of indirect artificial recharge method and is useful in obtaining higher-quality source water than surface water when procuring municipal water. This study evaluated optimal riverbank filtered water and the productivity of the radial collector wells on Ttansum Island in the area downstream of the Nakdong River, where Gimhae City is constructing a municipal water plant for the purpose of acquiring high-quality water. The RBF wells are planned to provide water to the citizens of Gimhae City through municipal water works. Groundwater flow modeling was performed with the following four scenarios: (a) 9 radial collector wells, (b) 10 radial collector wells, (c) 10 radial collector wells and two additional vertical wells, and (d) 12 radial collector wells. This study can be useful in determineing the optimum production rate of bank filtrated water not only in this study area but also in other places in Korea.
        247.
        2018.10 서비스 종료(열람 제한)
        Concrete has recently been modified to have various performance and properties. However, the conventional method for predicting the compressive strength of concrete has been suggested by considering only a few influential factors. so, In this study, nine influential factors (W/B ratio, Water, Cement, Aggregate(Coarse, Fine), Fly ash, Blast furnace slag, Curing temperature, and humidity) of papers opened for 10 years were collected at 4 conferences in order to know the various correlations among data and the tendency of data. The selected mixture and compressive strength data were used for learning the Deep Learning Algorithm to derive a prediction model. The purpose of this study is to suggest a method of constructing a prediction model that predicts the compression strength with high accuracy based on Deep Learning Algorithms.
        248.
        2018.05 KCI 등재 SCOPUS 서비스 종료(열람 제한)
        The study examines the magnitude of economic spillover and the impact of foreign direct investment (FDI) inflows on the efficiency of the bank industry in China. This study employs unit root tests, cointegration tests and cointegrating regression analysis, including fully modified ordinary least squares (FMOLS), canonical cointegrating regression (CCR) and dynamic OLS (DOLS) to test the proposed hypotheses. The sample is restricted to the period of time in which monthly data is available and comparable among variables for the period from January 2002 to October 2013 (142 observations). All of the time series data was collected and retrieved from the People’s Bank of China, China Monthly Statistics from the National Bureau of Statistics of China, and International Financial Statistics database from International Monetary Fund. The results of the Johansen cointegration test suggest that there is a long-run equilibrium relationship between FDI inflows, foreign exchange rate and banks performance in China. The results of cointegrating regression analysis using FMOLS, CCR and DOLS suggest that M2 supply and FDI inflows are significant at the 0.01 level. The results confirm that FDI inflows in the banking sector are positively related to the increase of banks productivity and performance and short-term loans in China. However, the results suggest that Chinese Yuan currency exchange rate to U.S. dollar is not significant in the banking and financial industry of China.
        249.
        2018.01 KCI 등재 서비스 종료(열람 제한)
        In this study, we analyzed all of the waste streams associated with household waste to provide a basis for incorporating the individual characteristics of municipalities in setting targets for waste-to-resource circulation. Toward this end, we examined how household waste is treated based on the disposal method (mixed waste disposed of in standard volumerate garbage bags, separation recyclable waste, and food waste) and the amount of residuals generated at their respective treatment facilities. The actual recycling rate or actual waste-to-energy conversion rate was calculated as the ratio of the actual amount of waste that is recycled or converted to energy against the amount of waste intake at waste treatment facilities. The conversion factor of actual recycling rates at 17 municipalities showed an average of 63.9% for public material recovery facilities (MRFs) with those for individual municipalities ranging from 50.4% to 93.2%, and an average of 93.8% for private and public food waste treatment facilities with slightly higher rates found for public facilities (70.4 ~ 100%) than private facilities (63.3 ~ 100%). The actual waste-to-energy conversion factor was 59.3% on average for combustible waste-to-energy facilities (17.2 ~ 72.3%) and 92.0% on average for biological waste-to-energy facilities (77.1 ~ 99.5%). To achieve the national target for the actual recycling rate, additional strategies for recycling or converting the residuals generated at recycling or combustible waste-to-energy facilities into resources are needed. The actual recycling and waste-to-energy conversion rates provided in this study based on a full examination of household waste streams hold valuable insights for incorporating the individual situations of municipalities in setting their targets for wasteto- resource circulation indicators and creating new strategies for improving the actual recycling rate.
        250.
        2017.10 KCI 등재 서비스 종료(열람 제한)
        Anaerobic mesophilic batch tests of energy crops (forage barley, rye, Italian ryegrass, and oats) were carried out to evaluate their ultimate biodegradability and two distinctive decay rates (k1 and k2) with their corresponding degradable substrate fractions (S1 and S2). Graphical statistical analysis and biochemical methane potential (BMP) tests showed that the ultimate biodegradability was 82 ~ 88% for forage barley, 70 ~ 77% for rye, 66 ~ 79% for Italian ryegrass, and 59 ~ 67% for oats. The readily biodegradable fraction (S1) of 73% of forage barley biodegradable volatile solid (BVS, S0) degraded within the initial 40 days at k1 of 0.055 day−1, whereas the slowly biodegradable fraction (S2) of BVS degraded over more than 80 days with long term batch reaction rates of 0.002 day−1. For oats, this readily biodegradable portion (S1) was 57%, which degraded with a k1 of 0.023 day−1 for the initial 60 days. The minimum hydraulic retention time (HRT) for the anaerobic digestion of forage barley, rye, and Italian ryegrass were estimated in the range 45 ~ 55 days and 65 days for oats.
        251.
        2017.09 KCI 등재 서비스 종료(열람 제한)
        This study was carried out to compare the survival and mutation rates and mutation spectrum by gamma-irradiation on rooted and unrooted cuttings of three spray type (‘Lovelydia’, ‘Yellowbabe’, and ‘Haetsal’) and two standard type (‘Vital’ and ‘Aqua’) cultivars in roses. Two groups, rooted and unrooted cuttings were gamma-irradiated at 70Gy for 24 hours. The irradiated rooted and unrooted cuttings were planted in a greenhouse, and survival, mutation rates and mutation spectrum were investigated 30 weeks after planting, respectively. As a result, survival and mutation rates ofgamma-ray irradiated plants were 16.4%~50.8% and 0~5.1% for unrooted cuttings, and 39.4%~55.1% and 0.7%~7.4% for rooted cuttings, respectively. In conclusion, both survival and mutation rates were a little higher on rooted cuttings than on unrooted cuttings. However, when only survived plants after gamma-ray irradiation were considered, mutation rates were 0~10% and 1.8%~14.1% for unrooted cuttings and rooted cuttings, respectively, showing no significant difference. In addition, diverse variations on color and number of petals or shape of flowers were detected both in plants from rooted and unrooted cuttings, which indicated that there was no significant difference in mutation spectrum between two groups.
        252.
        2017.05 서비스 종료(열람 제한)
        Background : This study was carried out to investigate the changes of the growth of ginseng in the house when the light intensity was increased. Three shading screens were used: shading materials 85%, 77%, and 55% net. Changes in the growth of ginseng and the quality of red ginseng were investigated in these shading materials. Methods and Results : The test site was a three house constructed in the Punggi Ginseng Research Institute, Gyeongsangbuk - do Agricultural Research and Extension Services. The entrance to the house is located east-west, and the structure is double steel frame. The inside of the house is covered with vinyl, and 85%, 75%, 55% shading net is installed for each shading treatment. From the end of June to the middle of August, a 55% shading net was double covered to reduce the high temperature damage. The test material was grafted on March 20, 2013. The management of the irrigation water was from 30 kPa to 10 kPa. The aM-21A data log of Wise Sensing Co., Ltd. was used to measure the cultivation environment in the house. Photosynthesis was measured using Lci Compact Photosyntheisi System, adc, UK. Surveys were carried out in accordance with the inspection standards of the Rural Development Administration. The data were analyzed statistically using SPSS. Conclusion : The summer temperature of shading method was more than 2℃ higher than other treatments in 55% shading treatment and more than 6℃ in autumn. The light intensity of 90 μmol/s/㎡ was lower than that of August, and the light intensity was higher than 400 μmol at the end of September. The 55% shading method showed twice as much light in summer and more than four times in autumn. The amount of photosynthesis increased due to the light intensity of 55% treatment, especially in the morning of May. In the light of shading method, 85% light shading method showed the best growth at 2 years, but 55% at 3 years and more, and 5 years at 5 years.
        253.
        2017.03 KCI 등재 SCOPUS 서비스 종료(열람 제한)
        This study investigates the causal relationship between stock prices and exchange rates for six Middle Eastern countries, namely, Egypt, Iran, Jordan, Kuwait, Oman, and Saudi Arabia before and during (after) the 2007 global financial crisis for the period between January 2004 and September 2015. The sample is divided into two sub-periods, that is, the period from January 1, 2004 to September 30, 2007 and the period from October 1, 2007 to September 30, 2015, to represent the pre-crisis period and the post-crisis period, respectively. Using Vector Autoregressive (VAR) model in a multivariate framework (including two control variables, inflation rates and oil prices) the results suggest that in the case of Jordan, Kuwait and Saudi Arabia, there exists bidirectional causalities after the crisis period but not the before. The opposite status is available for the case of Iran. In the case of Oman, there is bidirectional causality between the variables of interest in both periods. The results also reveal that the relationship between stock prices and exchange rates has become stronger after the 2007 global financial crisis. Overall, the results of this study indicate that fluctuations in foreign exchange markets can significantly affect stock markets in the Middle East.
        254.
        2017.01 KCI 등재 서비스 종료(열람 제한)
        In this study, poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV)/graphene oxide (GO) nanocomposite films containing various content of GO were prepared using solution casting method. The effect of GO content on Young’s modulus and dispersion of GO in PHBV matrix was investigated. Also, the thermomechanical properties, oxygen transmission rates and hydrolytic degradation of PHBV/GO nanocomposite films were studied. The addition of GO into PHBV improves the Young’s modulus and decreases thermal expansion coefficient. The improvement can be mainly attributed to good dispersion of GO and interfacial interactions between PHBV and GO. Furthermore, PHBV/GO nanocomposite films show good oxygen barrier properties. PHBV/GO nanocomposites show lower hydrolytic degradation rates with increasing content of GO.
        255.
        2016.12 KCI 등재 서비스 종료(열람 제한)
        Grape cultivar “Campbell Early” account for 70% of table grape in Korea and Leaf Spot Disease caused by Pseudocercospora vitis is one of a major disease in greenhouse and field grown area during late summer season in both of organic and conventional grape farm. Leaf spot disease can cause lowing of sugar content in fruit and vine growth and very difficult to control especially in organic field. Photosynthesis ability and chemical components are compared between leaf spot disease infected leaves with degree of necrotic area. With increase of disease necrotic area, CO2 differential value, water use efficiency and CO2 assimilation and respiration ratio are decreased proportionally and on the other hand, stomatal conductance value is not affected by disease necrotic area. Chlorophyll contents are also decreased by 50% in heavily infected leaves and imply decrease of chlorophyll contents is a major source of photosynthesis ability decline. With increase of disease necrotic area in leaves, total nitrogen and phosphate contents are decreased and on the other side, total carbon, potassium, calcium and magnesium contents are increased. From this research, we can infer that not only chemical control program is important in control of leaf spot disease but also fertilizing program is significant especially in organic agronomical control of fungal disease in grape cultivar “Campbell Early”.
        256.
        2016.10 서비스 종료(열람 제한)
        Background : Perilla frutescens L. is a bisexual, annual plant belonging to the Labiatae. Dormancy period of Perilla seed usually ranged from 85-200 days. The germination enhancing effects in a reduced seed vigor during the GA3 treatment has been reported. Objectives of the present study was to evaluate the effect of GA3 on germination rate and the expression of germination-related genes expression by using perilla seeds. Methods and Results : Three different cultivars (Saeyeopsil, Okdong) and accession (line 141) of perilla were used in the experiment and treated with GA3 at different concentration (50, 100, 300, 500 μM) for one day at dark condition. Germination test for perilla seed was carried out by using 100 perilla seeds treated with GA3 at 25℃. Rate of germination were evaluated after 10 days and the experiments were repeated three times in similar condition. Samples were collected from each cultivar and accessions for RNA extraction. After cDNA synthesis quantification, templates were subjected to RT-PCR using actin primers. EST blast performed for sequencing the RT-PCR products. Conclusion : Result showed that 100μM GA3 treated seeds of three perilla cultivars and accessions showed the highest germination rate. However, concentration of GA3 over 100 μM and lower than 100 μM resulted into reduced germination rate. Furthermore, expression of germination-related genes from 100 μM treated GA3 was higher compared to untreated sample by using 100 μM GA3 treated sample by using pC12, pJ14 primers.
        257.
        2016.09 KCI 등재 서비스 종료(열람 제한)
        Most of the commercial devices for vitrification are directly immersed into the warming solution (WS) for increasing of warming rate. However, the previous modified cut standard straw (MCS) which has reported is difficult to immerse into the WS. The aim of this study was to investigate whether the long cut straw (LCS) could be useful as a stable tool for vitrified-warmed human blastocysts. A total of 138 vitrified-warmed cycles were performed between November 2013 and November 2014 (exclusion criteria: women ≥38 years old, poor responder, surgical retrieval sperm, and severe male factor). The artificial shrinkage was conducted using 29-gauge needles. Ethylene glycol and dimethyl sulfoxide (7.5% and 15% (v/v)) were used as cryoprotectants. Freezing and warming were conducted using the LCS tool. The cap of LCS was removed using the forceps in the liquid nitrogen (LN2) and then directly immersed into the first WS for 1 min at 37℃ (1 M sucrose). Only re-expanded blastocysts were transferred after it was cultured in sequential media for 18-20 h. A total of 294 blastocysts were warmed, and all were recovered (100%). Two hundred eighty-five embryos were survived (96.9%). The vitrifiedwarmed blastocysts of all patients were transferred without any cancellation. We were able to achieve a reasonable implantation (24.2%), following by clinical pregnancy (36.2%), which then continued to ongoing pregnancy (36.2%), and live birth (31.2%). Using LCS is achieved the acceptable rates of survival, pregnancy and live birth. Therefore, the LCS could be considered as a stable and simple tool for human embryo vitrificaton.
        258.
        2016.02 KCI 등재 서비스 종료(열람 제한)
        This paper aims to analyze inequality of maize self-sufficiency rate among countries in 1970-2011. Utilizing sub-group consistency of Generalized Entropy and Atkinson inequality index, the estimated maize self-sufficiency rate inequality is further decomposed into two steps’ separate country groups. First, lower and upper income groups and then lower, lower middle, upper middle and high income groups are used based on the national classification of the world bank. It is inferred that 1980s’ policy intervention and 1990s’ Uruguay Round negotiations have different effect on the inequality among four different country groups.
        259.
        2015.12 KCI 등재 서비스 종료(열람 제한)
        This paper applied a new methodology to estimate the generation rate of waste refrigerator using Population Balance Model as well as assigning Weibull Distribution Function as probability distribution function (PDF) of lifespan. In order to determine the generation rate of waste refrigerator, it is necessary to estimate yearly sales quantity of new refrigerator and lifespan PDF of refrigerator. The average lifespan of refrigerator is determined to be 16.8 years as a result of averaging the lifespans of 4,682 waste refrigerators. We also developed a methodology to calibrate the PDF of lifespan of waste refrigerator. The generation rate of waste refrigerator in 2014 is estimated to be 1,822,633 decreasing sharply with time. The new methodology developed here can be applied to estimate the generation rates of other e-wastes.
        260.
        2015.10 서비스 종료(열람 제한)
        This research investigated the effects of matrix strength on the direct tensile behavior of high performance hybrid fiber reinforced cementitious composites (HPHFRCCs) at high strain rates. 3 different type matrixes were used (56 MPa, 81 MPa and 180 MPa). And macro fiber was long hooked fiber (H, =0.3 mm,=30 mm) and micro fiber was short smooth fiber (S, =0.2 mm,  =13 mm). The volume content of macro fibers was 1.0% and the volume content of micro fibers was 1.0%. The high matrix strength clearly increased the tensile strength and peak toughness of HPHFRCCs even at high strain rates (74 ~ 161 /sec).