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        검색결과 882

        221.
        2019.06 KCI 등재 구독 인증기관·개인회원 무료
        이 연구는 토픽 모델링의 LDA(Latent Dirichlet Allocation) 기법을 적용해 언론에 보도된 테러리즘 관련 뉴스 기사의 주요 토픽(topic)을 분석하였다. 이를 위해 지난 2014년 6월부터 2019년 5월 중, 미디어에 보도된 뉴스 중에서 테러리즘을 소재로 다룬 36,436건을 대상으로 토픽 을 추출하고, 주요 흐름을 시기별(모술탈환 이전, 모술탈환 과정, 모술탈 환 이후)로 구분하여 분석하였다. 이 연구에서 모술탈환 작전을 주요 분 석 시점으로 정한 것은 국제 테러리즘의 확산과 파급력이라는 측면에서 중요한 키워드가 ISIS(이슬람국가)이고, ISIS 세력의 확장, 축소, 다변화 등과 관련된 주요 사건이 모술탈환 작전이라고 여겼기 때문이다. 연구 방법적으로는 테러리즘과 관련한 방대한 양의 기사 내용을 정량 적으로 분석할 수 있고, 내용적으로는 주요 토픽을 파악함으로써 테러리 즘 기사의 이슈와 정책 이슈와의 관련성을 논의할 수 있는 토픽 모델링 분석을 실시하였다. 이상의 결과는 테러리즘에 대한 주제를 단어 중심으 로 범주화함으로써 관련 연구의 분석 기준을 마련할 수 있으며, 정책적 으로는 관련 이슈에 대한 언론 보도 토픽의 경향성을 파악함으로써 국제 테러리즘 발생에 대한 이해를 기반으로 정책 수립의 방향성을 제시할 수 있을 것이다. 이 연구는 선행연구에서 주요하게 다루지 않았던 테러리즘의 양상과 관련된 뉴스 기사의 주제적 특징을 객관적으로 도출함으로써, 시기별로 중심 주제가 어떻게 변화되고 있는지를 분석하였으며, 이를 통해 우리 사회에서 바라보고 있는 테러리즘 실태와 동향을 살펴보고자 하였다. 이 를 토대로 테러리즘 관련 언론보도의 주요 토픽과 테러리즘 관련 언론보 도 기사에서 모술작전 전후 시기별로 주요 토픽은 어떠한 변화 추이를 보이고 있는지에 대한 함의점을 도출할 수 있었다.
        223.
        2019.04 KCI 등재 구독 인증기관 무료, 개인회원 유료
        This study used a packed column reactor and a horizontal flow mesh reactor to examine the removal of copper ions from aqueous solutions using pine bark, a natural adsorbent prepared from Korean red pine (Pinus densiflora). Both equilibrium and nonequilibrium adsorption experiments were conducted on copper ion concentrations of 10mg/L, and the removals of copper ions at equilibrium were close to 95%. Adsorption of copper ions could be well described by both the Langmuir and Freundlich adsorption isotherms. The bark was treated with nitric acid to enhance efficiency of copper removal, and sorption capacity was improved by about 48% at equilibrium; mechanisms such as ion exchange and chelation may have been involved in the sorption process. A pseudo second-order kinetic model described the kinetic behavior of the copper ion adsorption onto the bark. Regeneration with nitric acid resulted in extended use of spent bark in the packed column. The horizontal flow mesh reactor allowed approximately 80% removal efficiency, demonstrating its operational flexibility and the potential for its practical use as a bark filter reactor.
        4,000원
        224.
        2019.03 KCI 등재 구독 인증기관 무료, 개인회원 유료
        This study purposed to see the effectiveness of a media literacy activity in a Japanese conversation class. For this class, teaching/learning contents and methods were developed utilizing the concept of media literacy. Specifically, a CF production activity was created and its effectiveness was compared with other conventional activities such as free talking and debating. The results showed that the CF production activity resulted in high scores and most students found the activity fun, cooperative, and creative. However, when compared with other course contents, it didn’t show much improvement in the students’ Japanese language proficiency. The results suggest that there is a need to do more research on the concept of media literacy and related methodologies in Japanese language education in order to decrease the gap between ‘having fun and developing creativity’ and ‘improving Japanese language skills’.
        5,500원
        225.
        2019.02 KCI 등재 구독 인증기관 무료, 개인회원 유료
        이 연구는 빠르게 진화하고 있는 OTT 서비스가 기존의 방송산업에 미친 영향과 영상콘텐츠의 생산과 유통, 소비에 미친 영향을 분석하였다. 이를 위해 초기 OTT 서비스의 개념이 어떻게 확장되었는지를 서비스 유형화와 함께 재개념화하였고, 서비스 제공사업자의 특성에 따라 어떠한 대응을 하고 있는지 분석하였다. 구체적으로는 OTT 서비스가 플랫폼과 디바이스의 다변화, 콘텐츠의 생산과 유통, 소비와 같은 전 영역에서 어떠한 변화를 초래하고 있는지를 살펴보고 이러한 변화에 영향을 미치는 요인이 무엇인지를 분석하였다. 그리고 OTT 사업의 현황을 정리하면서 가장 활발하게 OTT 서비스를 하고 있는 ‘넷플릭스’의 국내 진출 이후의 변화와 동향에 대하여 살펴보고 분석하였다. 이러 한 분석결과를 중심으로 OTT 서비스를 둘러싼 다양한 행위자들의 전략과 대응 등을 살펴보고 넷플릭스의 국내 진출 이후의 변화와 동향에 대하여 정리하였다.
        4,900원
        227.
        2018.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
        Although the efforts to establish fish embryonic stem cells (ESCs) have been made for a long time, derivation of authentic ESCs that possess pluripotency is still difficult suggesting a need for the stepwise optimization of the methods to establish fish ESCs. Primary culture of the blastomeres from the embryos at blastula stage is a critical step for establishing continuous ESC lines. Here, we evaluated the effects of temperatures and basal media on primary culture of blastula embryo-derived blastomeres in marine medaka (Oryzias dancena). The blastomeres were isolated from the blastula embryos and cultured in various conditions designed by the combination of 4 temperatures including 28°C, 31°C, 34°C, and 37°C and 2 basal media including Dulbecco’s modified eagle’s medium (DMEM) and Leibovitz’s L-15 medium (L15). With the exception of a case cultured in L15 at 31°C, the rate of primary cell adherence reached 100% when the blastomeres were cultured over 31°C. The period for primary adherence was significantly shorter in the groups cultured in 34°C and 37°C than in the ones in 28°C and 31°C. The proportion of subculture was significantly high in the group cultured in DMEM at 31°C compared to the other groups. Collectively, we demonstrated that the culture in DMEM at 31°C was effective to primary culture of the blastomeres derived from blastula embryos.
        4,000원
        228.
        2018.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
        Transition-metal-embedded carbon nanotubes (CNTs) have been accepted as a novel type of sensing material due to the combined advantage of the transition metal, which possesses good catalytic behavior for gas interaction, and CNTs, with large effective surface areas that present good adsorption ability towards gas molecules. In this work, we simulate the adsorption of O2 and O3 onto Rh-doped CNT in an effort to understand the adsorbing behavior of such a surface. Results indicate that the proposed material presents good adsorbing ability and capacities for these two gases, especially O3 molecules, as a result of the relatively large conductivity changes. The frontier molecular orbital theory reveals that the conductivity of Rh-CNT would undergo a decrease after the adsorption of two such oxidizing gases due to the lower electron activity and density of this media. Our calculations are meaningful as they can supply experimentalists with potential sensing material prospects with which to exploit chemical sensors.
        4,000원
        229.
        2018.11 KCI 등재 구독 인증기관 무료, 개인회원 유료
        In this study, a numerical approach based on mid-point integrated finite elements and a viscous boundary is proposed for time-domain wave-propagation analyses in infinite poroelastic media. The proposed approach is accurate, efficient, and easy to implement in time-domain analyses. In the approach, an infinite domain is truncated at some distance. The truncated domain is represented by mid-point integrated finite elements with real element-lengths and a viscous boundary is attached to the end of the domain. Given that the dynamic behaviors of the proposed model can be expressed in terms of mass, damping, and stiffness matrices only, it can be implemented easily in the displacement-based finite-element formulation. No convolutional operations are required for time-domain calculations because the coefficient matrices are constant. The proposed numerical approach is applied to typical wave-propagation and soil-structure interaction problems. The model is verified to produce accurate and stable results. It is demonstrated that the numerical approach can be applied successfully to nonlinear soil-structure interaction problems.
        4,300원
        231.
        2018.11 구독 인증기관·개인회원 무료
        The objective of this study was to identify the proteins actively involved in the protection and repair of damaged cells, secreted by canine adipose derived mesenchymal stem cells (AT-MSCs) into the conditioned media. For this purpose, conditioned media (CM) was recovered from passage three stage canine AT-MSCs and skin fibroblasts cultured in serum free media after 24, 48 and 72 h. The extraction of exosomes was performed from 10-20 ml of CM using total exosome isolation kit. The isolated exosomes were then subjected to western analysis for the identification of annexin-I, annexin-II, histone H3 and dysferlin proteins. Results demonstrated the expression of proteins in the conditioned media isolated from canine AT-MSCs reflecting their potential in reducing the extent of damage at cellular levels. In conclusion, the conditioned media derived from canine AT-MSCs can be helpful in restoring the normal structure of cells both in vivo and in vitro conditions.
        232.
        2018.10 KCI 등재 구독 인증기관 무료, 개인회원 유료
        The study aims to investigate the effects of media and self-image congruity of ideal body image on the dieting and exercising behaviors of Korean and U.S. female college students. This study focuses on the concept of self-image congruity in order to examine how respondents perceive actual and desired self-images compared to an ideal female body image selected by respondents. A self-administered survey was conducted, resulting in 331 total responses (194 from Korean students and 137 from U.S. students). The data were analyzed through descriptive analysis, t-test, exploratory factor analysis, and regression analysis using SPSS 23.0. The findings revealed significant differences between Korean and U.S. female college students. U.S. students were more exposed to body image ideals in the media than Korean students; however, Korean female students valued the information regarding ideal body image conveyed by the media more than U.S. respondents. Among Korean female students, exposure to media messages regarding ideal body image and media importance had significant effects on desired self-image congruity, while these factors were not significant among U.S. students. However, there was a negative effect of media exposure on actual self-image congruity among U.S. respondents only. Additionally, the study uncovered that Korean students manage their body image through dieting behaviors while U.S. respondents manage body image through exercise behaviors (weight training as well as cardiovascular exercise). The study provides further support for self-image congruity, which extends its applications to the body image field.
        4,900원
        233.
        2018.10 KCI 등재 구독 인증기관 무료, 개인회원 유료
        This study analyzed and discussed the competition relation between various media platforms, particularly fashion magazine, the Internet portal, and social networking (SNS) that provide fashion contents. The following results were obtained through this study. First, the Internet portal ranks the highest in all factors, followed by SNS, and fashion magazine as the lowest. Second, the Internet portal was competing with fashion magazine and SNS because there is an overlap between the two platforms. By contrast, SNS has a relatively low degree of overlap with fashion magazines, and they are complementary to each other. Third, the Internet portal has a strong advantage over fashion magazine and SNS in all factors. On the basis of the results of this study, we can summarize remarkable points in strategy formulation as follows. First, the Internet portal, which is popularized by “usage accessibility,” is expected to continue to dominate the competition over other media platforms while providing greater gratification to users of fashion contents. Second, the competitiveness of fashion magazines, which has been shrinking dramatically, lies in the diversity and quality of fashion contents. Innovating ways to develop creative fashion content and improve the quality through more in-depth analysis of the reader is essential. Third, SNS is slightly behind the Internet portal as a whole; however, it is one of the emerging platforms in the fashion content market because of its competitive advantage in terms of gratification opportunities.
        5,700원
        237.
        2018.10 KCI 등재 구독 인증기관 무료, 개인회원 유료
        The physical and chemical properties of corrugated cardboard-based media were evaluated to assess their suitability as substrates for plants. Samples were collected periodically from the same study area over 5 months to determine any seasonal variabilities. In addition to the corrugated cardboard-based media, the rural soil of the study area was used as the control. The corrugated cardboard-based media showed adequate levels of moisture content and bulk density and correspondingly high porosity values when compared with the rural soil. All corrugated cardboard-based media showed adequate levels of electrical conductivity, organic matter, and correspondingly high cation exchange capacity values when compared with the rural soil in all seasons. The C/N ratio of the corrugated cardboard-based media was similar to the optimal values of 15-20. However, the pH values of the corrugated cardboard-based media were lower than the optimum value(pH 4) for plant growth and rural soil. The moisture content value which cycle bobs up and down according to sampling date, and this means that the moisture content is affected by seasonal changes in the components entering the study area. The corrugated cardboard-based media appear to be acceptable for growing plants(Lotus corniculatus var. japonicus). Finally, the use of this media permits better vegetation establishment than the use of rural soil. Our results prove that corrugated cardboard-based media can exhibit higher plant cover over a long period(September-November) as opposed to rural soil. Our study demonstrates the effectiveness of corrugated cardboard-based media for plant growth, and we recommend that future studies should focus on potential materials relevant to revegetation and management.
        4,000원
        238.
        2018.10 구독 인증기관·개인회원 무료
        Destruxins (Dtxs) are insecticidal cyclic hexadepsipeptides produced by the entomopathogenic fungus Metarhizium anisopliae. Media composition for dtxs production was optimized with industrial grade media. Glycerol and casein peptone were selected as a carbon source and a nitrogen source, respectively. Dtxs production varied with C/N ratios. High yields of dtxs were observed at C/N ratios ranging 0.3 to 1.5, with concentrations mostly higher than 800 mg/L. Low yields were caused by high C/N ratio ranging from 3.0 to 8.0, resulting in less than 500 mg/L. The highest yield of Dtxs was obtained with 2% glycerol and 3% casein peptone, showing 192.2 mg/L of dtx A, 911.1 mg/L of dtx B, and 113.3 mg/L of dtx E, respectively. These results indicated that dtxs production is highly influenced by C/N ratio, especially the content of nitrogen source.
        239.
        2018.09 KCI 등재 구독 인증기관 무료, 개인회원 유료
        하늘매발톱꽃(Aguilegia flabellata var. pumila K.) 육묘시 적정 용토종류 및 시비 수준을 구명코자, 용토종류는 원예용 상토, 피트모스, 밭흙, 원예용상토 + 피트모스(1:1, v/v), 원예용상토 + 밭흙(1:1, v/v), 밭흙 + 피트모스(1:1, v/v), 밭흙 + 퇴비(1:1, v/v), 원예용상토 + 피트모스 + 밭흙(1:1:1, v/v/v) 혼합용토를 사용하였으며, 시비 시험은 기준시비량을 질소 – 인산 – 칼리 = 12 – 9 – 12kg/10a(초화류 표준시비량)을 기준으로 하여 기준시비량 대비 0%, 50%, 75%, 100%, 125% 및 150%를 처리하여 시험한 결과, 용토종류는 용토별 화학적 특성은 피트모스가 pH 및 양분함량이 가장 낮았고, 원예용 상토 및 퇴비가 혼합된 용토에서 EC를 비롯한 양분함량이 높은 경향이었다. 발아율은 피트모스 단용 처리에서 파종 30일 및 45일에 각각 48% 및 54%로 가장 낮았고, 밭흙 + 퇴비 혼합용토에서는 86%였고, 그 외 용토에서는 92~98%였다. 파종 후 120일과 150일의 묘생육은 원예용상토에서 가장 좋았다. 시비량별 생육은 무처리에 비하여 시비 처리구에서 생육이 좋았으며, 식재 100일 후 생육에서는 기준 시비량 75%, 100% 및 125%에서 양호한 경향을 보였다. 기준 시비량 150% 처리에서는 오히려 생육이 감소하는 경향이었다. 결과적으로 하늘매발톱꽃 육묘시 육묘용토에서는 원예상토를 이용하고 시비기준은 기준시비량 대비 75%로 관리하는 것이 전반적인 생육이 양호하였다.
        4,000원
        240.
        2018.09 KCI 등재 구독 인증기관 무료, 개인회원 유료
        In an era of increasingly high integration of information technology and social life, the media is undergoing intelligent transformation and upgrading to meet the various intelligent needs of users in the future. In the future, the media wants to further seek development. It is necessary to carry out a corresponding path transformation for the backbone of media talents and journalists, and to promote the progress and development of the entire journalism through the transformation of the path of talent training in colleges and universities. Firstly, this article briefly expounds the era and environmental background that digital media talents training must be transformed. Secondly, it discusses the necessity analysis of the transformation of digital media talents in colleges and universities. Again, try to explore the value of talent and its important role in the vision of intellectual media. Finally, from the "complex + differential" training mode, "theoretical + practical" training mode, "scientific research-oriented" training mode, "industry competition-oriented" training mode, "technical construction-oriented" training mode, "domestic + foreign comprehensive" training mode and other aspects put forward the countermeasures and suggestions for the transformation path of digital media talents training in Colleges and universities.
        4,000원