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        검색결과 1,241

        541.
        2013.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
        This study aims to examine the relationships between the learners' task preferences (input vs. output, deductive vs. inductive, individual vs. group work) and task performances (noticing, successful uptake, and achievement in grammar instructions). The findings showed that task performances were influenced by L2 learners’ instructional preferences. The input or inductive preferences were negatively correlated with the performance in input-oriented instruction, while they performed well when the task type matched their preference, for example, output preference with output instruction. In addition, the low levels preferred the input or deductive styles while the high levels preferred the output-based instruction. Therefore, we should take into account L2 learners’ learning preferences or styles when deciding the types of instructions in grammar teaching.
        5,800원
        542.
        2013.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
        본 논문은 알브레히트 뒤러의 작품 제작 과정 및 결과물에 나타난 동물의 이미지를 통해 작가의 자연과 예술에 대한 사상의 단면을 살 펴보고자 한다. 뒤러가 남긴 수많은 작업들 –목판화, 동판화, 회화, 드 로잉 등 –에 나타나는 여러 가지 동물들은 작업의 시기와 종류에 따 라 다양한 역할을 보여준다. 작가의 변화하는 예술관을 나타내기도 하며 때로는 새로운 경험의 기록이 되기도 한다. 자연에 대한 철저한 관찰과 모사에서 출발하는 뒤러의 회화나 판화 는 그 제작 과정에서 수많은 드로잉을 남겼다. 특히 동물의 부분적 혹은 전체적인 모사는 단순한 스케치나 습작 이상의 의미를 지니며, 주로 기독교적, 신화적 주제를 담고 있는 뒤러의 판화와 회화 속에서 새로운 상징적 의미를 부여받는다. 이러한 동물의 이미지들은 작가의 상상력으로 재조합되거나 화면의 곳곳에 배치되어 작품의 의미를 더 욱 풍부하게 만든다. 한편, 특정 동물의 등장은 특히 관객을 향하는 시선 처리를 통해 화면 속의 내러티브와 관객을 연결하고 정서적 공 감을 유발하는 매개의 역할을 하기도 한다. 뒤러의 자연과 동물에 대한 접근 방식은 레오나르도 다빈치로 대표 되는 이탈리아 르네상스의 태도와는 차이점을 보인다. 이탈리아 르네 상스에 직간접적인 영향을 받았던 뒤러는 다빈치와 마찬가지로 자연 의 비례에 대해 천착하며 관찰에서 비롯된 상상력을 강조했지만, 그 의 자연에 대한 근본적인 관심사와 회화적 표현 방식은 달랐다. 다빈치가 동물들의 해부학적 구조, 움직임의 관찰을 통해 자연의 보이지 않는 원리와 패턴을 탐구하고자 했다면, 뒤러는 자연에 존재하는 개 체들의 표면적 특성의 이해와 세부적인 묘사에 주력했다. 뒤러의 “동물들 무리 속에 계신 동정녀(The Virgin among a Multitude of Animals)”와 “아담과 이브 (Adam and Eve),” 즉, 천상 과 인간의 타락을 각기 상징하는 두 작품 속에서 동물들을 통해 표현 된 자연에 대한 깊이 있는 관찰과 심볼리즘의 결합은 르네상스적 자 연주의와 고딕적 상상력을 조화시킨 뒤러 작품 세계의 핵심을 보여준 다고 할 수 있다.
        8,900원
        543.
        2013.10 구독 인증기관 무료, 개인회원 유료
        Projects and managing them have always been considered a subject worth studying. The formalized form of project management is not as old as many other branches of industrial engineering, however, the progress that has been observed through innumerable reviews and research findings is extraordinary and outstanding. The matter of interest for this paper is to initiate discussion regarding simplifying the tools and methods for managing projects and begin an era of simplification by discouraging practices that make project management a harder job to perform and a tougher task to handle. Besides summarizing the definitions of “project” that have been found from reviewing the relevant text, it deliberates on revising the duties and responsibilities of project manager and proposes performance expectancy triangle. It sheds light on several factors that have been found critical to the success and failure of projects. Also, it proposes a function indicating that customer needs and demands or desires greatly affect and instigate project complexity.
        4,000원
        546.
        2013.10 구독 인증기관·개인회원 무료
        The differences in adult lifetime among various silkworm strains has been suggested that the adult lifetime may be genetically controlled. In this experiment, using J037 and Daizo strains we investigated genetic factors related to the adult lifetime of silkworm. We constructed the full-length cDNA library from the adult male of the J037 strain. A total of 2,688 clones were randomly selected, and we performed a differential display hybridization with cDNA probes generated from J037 and Daizo adult males. In conclusion, 193 clones were identified as differential expressed genes, and 154 unique genes were generated after the assembly of 193 clones. Of the 154 unique genes, the most abundant genes were cytochrome oxidase subunit-1 gene(9 times) and unknown(clone ID; 1-50) gene(5 times). The functional groups of these unique genes with matches in the AmiGo database were constructed according to their putative molecular functions. Among thirteen functional categories, the largest group was unclassified protein(24%). In addition, We analyzed the nucleotide and deduced amino acid sequences of the most highly occurred gene(1-50, EF434397), which consisted of 240 amino acids. However, it is confirmed yet that these genes really have an affected on the silkworms longevity.
        547.
        2013.10 구독 인증기관·개인회원 무료
        7 new sericinjams are in breeding by the hybridization of silkworm genetic resource, that is, ND strain and the parent silkworm, and the feature of new sericinjam was classified by a cocoon color. According to cocoon color, sericinjam showed two kind of color including the light green and yellow. D601, D704 and D707 with the light green silk were a difference to density of color. Also D703, D705, D751 and D752 with the yellow silk showed a difference to density of color. As investigating the pupation rate which means the healthiness of the silkworm, D601 was highest with 93%, and D703 was lowest with 65.6%. The ratio of the sericin silk showed some difference every breed, and D601 among them was highest with 91%. There is close correlation between sericin cocoon quantity and the dried silkgrand weight. The weight of the dried silkgrand for sericinjams which were compared with baeokjam was low about 2.5 ~ 7.9 times. Among sericinjams, D601 was lowest, and D707 was highest. The pure sericin content of sericinjams was an above 96%, and sericin content of per one cocoon was low 1.4 ~ 2.5 times than baeokjam. Blood of silkworm which makes the light green silk exhibited anti bacterial activity against Gram-negative bacteria.
        548.
        2013.10 구독 인증기관·개인회원 무료
        Bumblebee, Bombus terrestris is widely used to pollinate various crops, especially tomato, in greenhouses. Mason bee, Osmia cornifrons, which is using as apple pollinator. Here we investigated characteristics on pollinating activity of B. terrestris and O. conifrons at different weather conditions in apple orchard. The foraging activity of O. conifrons was more sensitive than that of B. terrestris at weather conditions including temperature, illumination intensity and wind velocity. The pollinating activity of O. conifrons was very low than that of B. terrestris at a low temperature, cloudy, rainy and windy weather. Therefore, Our results indicated that B. terrestris was suitable for apple pollinator than O. conifrons, especially in low temperature and bad weather.
        549.
        2013.10 구독 인증기관·개인회원 무료
        Bumblebee, Bombus terrestris is widely used to pollinate various crops, especially tomato, in greenhouses. Mason bee, Osmia cornifrons, which is using as apple pollinator. Here we investigated characteristics on pollinating activity of B. terrestris and O. conifrons at different weather conditions in apple orchard. The foraging activity of O. conifrons was more sensitive than that of B. terrestris at weather conditions including temperature, illumination intensity and wind velocity. The pollinating activity of O. conifrons was very low than that of B. terrestris at a low temperature, cloudy, rainy and windy weather. Therefore, Our results indicated that B. terrestris was suitable for apple pollinator than O. conifrons, especially in low temperature and bad weather.
        550.
        2013.10 구독 인증기관·개인회원 무료
        Currently, flies are used to pollinate Welsh onion for seed production. However, the use of flies for pollination has caused problems in Welsh onion seed production due to sanitation issues, smell, and the difficulty of feeding the flies. Therefore, we investigated the effects of pollination with bumblebees (Bombus terrestris), flies (e.g., houseflies, flesh flies, blue bottle flies), mason bees (Osmia cornifrons), honeybees (Apis mellifera) and blowflies (Lucilia illustris) in a small net screen house (2.2m×1.7m×2.5m) for onion seed production. Although the number of flies was about three times than that of other insect pollinators, fies and bumblebees showed equivalent pollination ratios, but the remaining three insect species showed lower values. For the percentage of seed set per umbel, the number of seeds per flower and umbel, bumblebees and flies showed similar results. These results showed that pollination by bumblebees can be used as an alternative approach in breeding Welsh onion. An analysis of the most appropriate colony of bumblebees for use as pollinators for breeding Welsh onion in a small net screen house showed that colony of fifty to eighty bees was the most efficient level. The visiting time on the flower and spending time from a flower to another flower of B. terrestris worker on small net screen house was 2.2 seconds and 1.8 seconds, respectively.
        551.
        2013.10 구독 인증기관·개인회원 무료
        Virus infections of the honeybee(Apis mellifera) have been increasingly investigated during the last decade. In general, honeybee viruses are widespread and most of them persist as inapparent infections. We screened honeybee colonies for the presence of several bee viruses, including deformed wing virus(DWV), black queen virus(BQCV), Kashmir bee virus(KBV), Israeli acute paralysis virus (IAPV), sacbrood virus(SBV), acute bee paralysis virus(ABPV), using uniplex RT-PCR. Frequently simultaneous infections with different viruses are diagnosed in seemingly healthy bee colonies. Therefore we developed a multiplex RT-PCR assay for the simultaneous detection of multiple bee viruses.
        552.
        2013.10 구독 인증기관·개인회원 무료
        Sacbrood virus (SBV) is one of the most destructive honey bee virus. The virus causes failure to pupate and kills honey bee larvae. The infacted larvae`s color is change to brown. At the end, honey bee colony is destructed. Recently Korean Scabrood virus(KSBV) caused a great loss of Korean honey bee(Apis cerena) colonies for short period. Therefore, We need a highly rapid diagnosis method for rapid detection of KSBV. In this study, We need amicro-scale chip-based real-time PCR system (GeneChecker®). This system was developed for rapid, specific PCR based diagnosis. This system has uncommonly fast heating and cooling system. So We was able to detecting of KSBV in Apis cerena in short time. This system needs small reaction volume(total 10ul). This volume include SsoFast™ Evagreen Supermix and serially diluted cDNA templates showed a high sensitivity of 101copies.That machine can setting each PCR stage time. A specific detection primer set (KSBV-123-F/R) was used to amplify a unique 123bp DNA fragment. This PCR assays using serially diluted cDNA templates showed a high sensitivity of 101 copies. When applied to KSBV-positve samples, the result showed high specifity. The minimum diagnosis time was 9m 47s (30cycle). The amplied positive samples appear red fluorescent color. This novel detection method could be used a PCR-based diagnositic tool (GeneChecker®). The results showed high sensitivity and specifity in short time. And this diagnosis method is expected to be applied to rapidly detect various pathogens.
        553.
        2013.10 구독 인증기관·개인회원 무료
        Sacbrood virus (SBV) is one of the most serious honeybee viruses. The virus causes failure to pupate and death in both larvae and adult bees. Recently, Korean Sacbrood virus (KSBV) caused a great loss in Korean honeybee (Apis cerana) colonies. Although KSBV shows high homology with SBV strains, it has unique motifs and causes different symptoms. Therefore, a simple, sensitive and specific method for detecting KSBV is needed urgently. In this study a reverse transcription loop-mediated isothermal amplification (RT-LAMP) and a novel micro PCR-based detection method, termed ultra-rapid real-time PCR (URRT-PCR) were applied for rapid detection for korean sacbrood virus (KSBV) from honeybees (Apis cerana) infected with SBV in Korea. The LAMP could be detect the virus in RT-LAMP reactions containing 102copies of pBX-KSBV within 30 min, which was 10 times more sensitive than a RT-PCR assay. The URRT-PCR showed high sensitivities which were able to detect 10 copies in the standard assays. In the application of URRT-PCR detection to an KSBV-infected honeybee, the shortest detection time was 10 min 12 sec, including reverse transcription. In addition, these methods could be distinguished between KSBV and other closely-related SBV strains, These rapid methods were rapid molecular-based diagnostic tools and useful tool for the rapid and sensitive diagnosis of KSBV infection of honeybees.
        554.
        2013.10 구독 인증기관·개인회원 무료
        Sacbrood virus (SBV), a causative agent of larval death in honeybees, is one of the most devastating diseases in bee industry throughout the world. Lately the Korean Sacbrood virus (KSBV) induced great losses in Korean honeybee (Apis cerana) colonies. However, there is no culture system available for honeybee viruses, including SBV, therefore, the research on honeybee viruses is practically limited until present. In this study, we investigated the growth and replication of KSBV in cell cultures. The growth of KSBV was demonstrated by RT-PCR, quantitative real-time PCR, TEM and nucleotide sequence analysis. The results demonstrated that SBVshowed the replication signals in mammalian cell lines, including Vero cells without any signs of cytopathic effect (CPE). The results of RT-PCR, quantitative real-time PCR and in vivo infection with KSBV were also indicated the replication. Phylogenetic tree analysis shows our sequence included in distinct group with other SBV strains from China and Korea. It clearly showed the differenciation between field strain and attenuated strain through cell culture. The results of present study demonstrated for the first time that SBV like other animal viruses could be adapted and attenuated in cells through the sequential passages. The sequential adaptation through cell culture could result in discrepancy of pathogenicity of virus and morphological characterization. For this reason, the present results indicated that the cell adapted SBV could be a valuable tool to study the general properties of this emerging virus, including pathogenicity in the future.
        555.
        2013.10 구독 인증기관·개인회원 무료
        Caterpillars, the larvae of butters and moths(Lepidoptera), are enormously important in terrestrial food webs. They are not only the preferred grub for insects, birds, fishes, reptile and amphibian but also engineers of nutrient cycling processes and are the largest natural consumers of vegetation. Even though their major role in the ecosystem, details of biology are poorly known for most species. HECRI(Holoce Ecosystem Conservation Research Institution) has been carried out to identify larvae and to acquire useful biological information of primary endemic insect larvae through rearing from 1997 to 2013. Of these this study is the result about special caterpillars feeding on the foliage Oak Trees (Quercus spp.) which composed 60-70% of broad-leaved forest thereby important component for forest in the Korean Peninsula. Total 297 species belonging to 23 families were collected and identified 101 species belonging to 21 families. Among them Oak Trees-dependent monophagous caterpillars are 247 species belonging to 20 families and polyphagous caterpillars are 50 species belonging to 11 families. The dominant family is Noctuidae(83 species), second is Geometridae(67 species) and followed by Notodontidae(33 species).
        556.
        2013.10 구독 인증기관·개인회원 무료
        The Zena hawk moth(Langia zenzeroides) is one of the most dangerous insect pest feeding on Rosaceae fruits(Prunus persica Batsch, Prunus salicina Linnaeus) in Korea because of gregarious diet. The study was conducted to investigate biology and the temperature effect on adult emergence of overwintering L. zenzeroides pupae at five different constant temperatures (15, 20, 25, 27.5 and 30°C) with photoperiod 10:14(L:D) and relative humidity 60%. The lower developmental thresholds of L. zenzeroides were 9.7°C. Developmental period of overwintering pupae to adults decreased with increasing temperature from 15 to 30°C. Mortality of five different constant temperatures (15, 20, 25, 27.5 and 30°C) was 4, 8, 20, 8 and 48%. Especially mortality of constant temperature 30°C was higher than other conditions and survival rate of 15°C was the highest. Thermal constants of L. zeroenzides were 109.5DD. The relationship between the developmental rate and temperature was fitted by linear and one nonlinear developmental rate models (Lactin 1). The development variation of overwintering pupae was described by the two-parameter Weibull distribution model. We investigated development period in the study site by using 70 eggs. From egg to pupa period was 84.9±0.4.
        557.
        2013.10 구독 인증기관·개인회원 무료
        Temperature is one of important factors to determine insect phenology. Based on the bioclimatic law, the relationship between climate change and ecosystem change was studied from 2008 to 2013 in HECRI by monitoring the spring emergence patterns of three Papilionidae species (Papilio xuthus, P. machaon, and Sericinus montela). The overwintering pupae were set on the wood plate and adult emergence were monitored and recorded in every morning. The first spring emergence of P. xuthus, P. machaon and S. montela in 2013 were Apr 19th, May 1st and Apr 22th, respectively. And peak time of three species were May 7th, May 11th and May 9th, respectively. Study on temperature-dependent development was conducted to investigate the temperature effect on adult emergence of overwintering S. montela pupae at four different constant temperatures (15, 20, 25 and 30°C) with photoperiod 10:14(L:D). The low temperature threshold of female, male and both sexes combined were 12.39, 12.16, and 12.37°C, respectively. Developmental period of overwintering pupae to adults decreased with increasing temperature from 15 to 30°C. Thermal constant of female, male and both sexes combined were 220.26, 192.31, and 200.18DD, respectively. The relationship between thermal constant and cumulative adult emergence was predicted by temperature-dependent development. Estimate through 7 times on the highest temperature was equal and results were distinctively divided into two pattern(2008~2010 and 2011~2013). The relationship between observed and estimated values was presented by linear regression (r2=0.97)
        558.
        2013.09 구독 인증기관 무료, 개인회원 유료
        In the livestock feed industry, antibiotics are used to prevent disease, promote growth rate, and improve feed efficiency. However, antibiotic supplementation to animal feed results in increased bacterial resistance to antibiotics as well as antibiotic residues in animal products, which can negatively affect human health. Therefore, alternative sources of antibiotics are need- ed. Probiotics as an alternative to antibiotics in animal feed have been shown to increase feed efficiency and growth rate by improving microbial balance. Further, Bacillus sp. produces a wide spectrum of antibacte- rial peptides. The present study was conducted to investigate the effects of dietary supplementation with CS-32 on safety, growth rate, and feed efficiency. Antibacterial substance (5697.9 molecular weights) produced by CS-32 was isolated and purified from culture broth. Moreover, the results of minimal inhibi- tory concentration (MIC) test confirmed the excellent antibacterial effect of CS-32. In vivo, 0.1% and 1% CS-32 were fed to broiler chickens for 28 days. Feed efficiency was slightly higher in groups of chickens supplemented with 0.1% and 1% CS-32 than those of the control group. CS-32 had no significant effect on necropsy findings, hematology, or serum biochemistry, and there was no mortality. These results suggest that CS-32 among various biologically active substances may be safe and effective as a feed additive to improve growth rate and feed efficiency.
        4,000원
        559.
        2013.09 구독 인증기관 무료, 개인회원 유료
        Rutin is one of the major flavonoids found in buckwheat (Fagopyrum esculentum Moench). While rutin is already known to exhibit anti-oxidative, anti-inflammatory, and anti-carcinogenic activities. However, the health beneficial function of rutin metabolites is not well understood. In DPPH radical scavenging assays, the present study found that 3,4-dihydroxyphenyl acetic acid had the highest total anti-oxidant activity, followed by 3,4-dihydroxyphenylacetic acid, rutin, homovanillic acid, and 3-hydroxyphenyl acetic acid. Further, 3,4-dihydroxyphenylacetic acid strongly reduced LPS-induced IL-6 production in RAW 264.7 cells, compared with other metabolites. Therefore, these results suggest that rutin metabolites have potential to be utilized as food ingredients with anti-oxidant and anti-inflammatory activities.
        4,000원
        560.
        2013.08 구독 인증기관 무료, 개인회원 유료
        This is a miracle in movies. It’s the best shaman ritual with tears and blood through the camera. It’s Muel O’s talent to make it embracing the ordinary life not with the formalism of intellects. ‘Jiseul’ is one of the best movies this year and full of the immortal spirit. This is the review on the outcome from the minimal condition. You can imagine the outcome from more fulflling conditions. It’s time that we should fully support him who is dreaming to fly high where nobody has paid attention
        4,000원