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An Experimental Study on Mode ll Fracture Toughness Determination of Rock (암석의 전단 파괴인성 측정에 관한 실험적 연구)

  • 윤정석;전석원
    • Tunnel and Underground Space
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    • v.13 no.1
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    • pp.64-75
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    • 2003
  • This study presents a newly suggested test method of Mode II fracture toughness measurement called "Punch Through Shear Test" which was originally proposed by Backers and Stephansson in 2001. The purpose of this study is to check the validity of the suggested testing method by performing Mode II fracture toughness tests for Daejeon Granite. In addition, the optimal specimen geometry for the testing and the relation between Mode II fracture toughness and confining pressure were also investigated. Fractured surface was observed to be very smooth with lots of rock debris which came off fracture surface which obviously implies that the surface was sheared off. This confirms that Mode II fracturing actually occurred. In addition, numerical analyses including continuum analysis, particle flow code analysis and crack propagation simulations were performed. Results of these numerical analyses indicated that the cracks occurred in the specimen were predominantly in Mode II and these cracks led to failure of the test specimen. From this investigation, it can be concluded that the newly suggested "Punch Through Shear Test" method provides a reliable means of determining the Mode II fracture toughness. fracture toughness.

Evaluation of Current Preparing Status for Experimental Practice by Faculty of Clinical Pharmacy in Korea (임상약학 담당교수에 의한 한국 약학전문대학원의 실무실습준비 현황 평가)

  • Lee, Ok Sang;Lim, Sung Cil
    • YAKHAK HOEJI
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    • v.57 no.3
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    • pp.219-225
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    • 2013
  • The Korean pharmacy education has introduced new curriculum since 2011. In the new curriculum, pharmacy students have been provided strenthen experimental education and clinical pharmacy has been more important than previous curriculum. Thus, faculties in the college of pharmacy should prepare the circumstances correlated with the changed curriculum. To accomplish successful setting, all faculty and practice experts must work together and need financial assisstant from the college. However, there are many different obstacles among 35 colleges of pharmacy in Korea. In order to narrow a gap among students and find the way to overcome it together, we studied the problem of preparation process in Korean colleges of Pharmacy. We studied the process of practical education in college of pharmacy by means of self-reporting questionnaire from November 29th 2012 to December 31th 2012. The questionaire comprised of syllabus related to clinical pharmacy, the number of professor in charge of clinical pharmacy or pharmacotherapeutics, the plan of securing faculties in the field of clinical pharmacy, the budget, site, instrument for preparing experimental education, the lesson time number of experimental education, MOU, education and treatment of preceptor in the practice site and committee of experimental education in the college. Total 21 of 35 colleges participated in this survey. They showed different composition of syllabus, budget, the circumstances of experimental education, the education and treatment of preceptor. Most colleges are unclear the site and preceptor of experimental education and they did not contract the MOU with the sites. 9 of 21 also did not have the committee of experimental education in the colleges. From 2013, some colleges of pharmacy start actual experimental education. Inadequete preparation and different quality of education can make student incomplete pharmacists, so it will be negative effect on public health. To overcome challenge and obtain desirable goal, funding/administrative assistant from the college and networking within 35 colleges of pharmacy are needed.

Excess Pore Water Pressure Response in Soft Clay under Embankment (성토하부 연약지반에서의 과잉간극수압 거동)

  • Kim, Yun-Tae;Kim, Nak-Kyung
    • Journal of the Korean Geotechnical Society
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    • v.18 no.3
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    • pp.105-112
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    • 2002
  • Increases in excess pore water pressure without change of surcharge load were reported in clay underneath embankment at Berthierville and Olga sites after the end of construction. These abnormal phenomena could not be explained by classical consolidation theory. This paper presents a nonlinear viscoplastic model to interpret an increase in pore water pressure on natural clay, The proposed model can consider the combined processes of pore water pressure dissipation according to Darcy's law and pore water pressure generation due to viscoplastic strain, as well as time-dependent viscoplastic behaviour and strain rate dependency of preconsolidation pressure. The calculated results using numerical analysis are compared with measured ones under embankments built on soft clay at Berthierville and Olga in Quebec, Canada. It may be possible to explain the phenomenon of excess pore water pressure increase after the end of construction using the proposed nonlinear viscoplastic model.

Ethnicity and Urban Ethnic Places in American Cities: Fading Away or Resilient\ulcorner (북미도시의 민족성과 민족집단장소 이론의 지리학적 함의: 동화론 비판을 중심으로)

  • Youngmin Lee
    • Journal of the Korean Geographical Society
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    • v.36 no.5
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    • pp.527-538
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    • 2001
  • Viewed from the framework of world system, international migration is connected sometimes to unequal power relations by prejudice and discrimination in destination areas, or to equal power relations by intentional effort for harmonious multiculturalism. According to the existing ethnic relation theory, assimiationism, it is natural that ethnicity is fading away as the foreign immigrants of different ethnic background have long limed in a destination area, and thus the relative urban ethnic places are weakened and finally dissapeared. Through the various examples particularly on the United States, however, ethnicity would not be easily fading-away but be sustained for long time. Also, the characteristics of ethnicity or ethnic place are sometimes reivented or reconstructed as the various situation of multiculturalism is affected by postmodernism. Whether it is the thing made by ethnic segregation or by ethnic congregation, ethnicity and ethnic place are evidently a kind of affluent resources of culture and economy in the destination areas.

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Rural Telematics and the Possibilities for Regional Development: The Case of Information Model Village in Weonju, Korea (농촌지역의 정보화와 지역발전: 원주 정보화시범마을 사례)

  • sungjae Choo
    • Journal of the Korean Geographical Society
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    • v.36 no.5
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    • pp.516-526
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    • 2001
  • This study aims to reveal the capacity of impacts that the diffusion of networked computer in rural areas, or so-called rural telematics, has on regional development schemes. It is accomplished mainly by a case study of a small rural village near the city of Weonju, Korea, which has been recently designated as an information model village by the provincial government and given supports for information infrastructure. The case study shows that although the residents'computer use is confined to a very elementary level in every respect of using internet, e-mails, and visiting village portal site, there is high potential that extended use of networked computer would bring positive changes in life-styles and community formulation, and hence new possibilities of regional development. These positive moves will be possible by increasing economic, social and cultural benefits that the residents receive from using computer facilities. One of the important prerequisites is to transform external motivation to internal one and to lead the residents to a more active use of computers.

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The Labor Force Transformation in Korea: 1960~1980 (한국에 있어서 각 산업부문간 노동력의 변천과정)

  • Kim, Hangon
    • Korea journal of population studies
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    • v.9 no.2
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    • pp.107-128
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    • 1986
  • 본 연구의 목적은 노동력의 사회적 특성적인 면에 있어서 각기 다른 산업에 종사하는 노동력의 "누가" "어떻게" 변화해 가는가에 중점을 두면서 한국의 산업 각 부분간의 변천과정을 조사하는 데 있다. 이 연구에는 1960, 1970, 1980년에 실시된 한국 센서스 자료가 주로 사용되었다. 본 연구의 결과에 따르면 1960년과 1980년 사이의 한국의 산업 구조적인 면에 있어서의 급속한 변화를 보여주고 있다. 그러한 변화들은 주로 경제발전 정책과 더불어 농촌지역에서 도시지역으로의 인구이동에 기인된다고 하겠다. 예를 들면 1960년에 65%의 노동력이 1차 산업에 종사한 반면에 1980년에는 38.5%로 감소했고 이와는 대조적으로 1960년에 오직 8.7%의 노동력이 2차산업에 종사하던 것이 1980년에는 27.6%로 증가하였다. 3차 산업 역시 1960년에 23.8%에서 1980년에 33.9%로 10%의 증가를 보였다. 경제.발전이 이루어지는 과정에서 실업자들이나 잠재 실업자들이 경제활동에 참여할 수 있었기 때문에 경제구조 자체가 예전에 비해 더 안정이 되고 생활수준도 향상이 되었다고 하겠다. 이러한 결과는 부분적으로는 계속된 5개년 경제개발 계획에 기인된다고 할 수 있다. 경제발전 과정에서의 대도시로의 인구집중, 특히나 2차 산업과 3차 산업이 집중되어 있는 서울로의 인구집중은 주택, 교통, 범죄등 많은 문제를 낳고 있다. 동시에 도시지역에의 과잉 노동력의 존재와 농촌지역에는 특히나 농번기에 노동력 부족현상을 야기시키고 있다. 시간의 흐름에 따라 여성노동력의 비율, 전문직과 사무직 종사자, 그리고 서비스분야 종사자들의 비율이 증가하였는 데 비해 대부분의 다른 국가에서 처럼 한국에 있어서도 자영인의 비율은 경제발전 과정에서 감소하였다. 경제발전과 더불어 보다 전문화되고 조직화된 시장중심의 생산체제가 가구와 지역사회 중심의 생산기능을 흡수하므로서 많은 노동력이 임금 노동자가 되었다. 특히나 단순노동을 통한 많은 젊은 여성들을 고용하는 제조산업 분야에서 여성들이 낮은 임금과 과로 그리고 나쁜 작업환경으로 인하여 그들의 건강을 해치고 직업병을 유발할 가능성이 많다고 하겠다. 지난 20년에 걸친 급속한 정부 주도형의 경제발전은 노동력의 제 산업 간의 급속한 변천과 더불어 긍정적인 측면과 부정적인 측면을 모두 낳았다고 할 수 있겠다.측면을 모두 낳았다고 할 수 있겠다.

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The Impact of Soccer Star's Human Brand on Attitude and Attachment to club (축구 스타의 휴먼 브랜드가 구단에 대한 태도 및 애착에 미치는 영향)

  • Shin, Jin-Ho
    • Journal of the Korean Applied Science and Technology
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    • v.38 no.2
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    • pp.579-586
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    • 2021
  • This study aimed to identify the influence of soccer star's human brand on attitude and attachment to the club, providing the importance and implications of brand management of star players in the club. Therefore, a non-face-to-face mobile survey was conducted from January 14 to March 5, 2021, and a total of 348 copies of data were used for the final analysis. Data processing used the SPSS (ver.21.0) program to conduct frequency analysis, internal consistency and exploratory factor analysis, correlation analysis, and multiple regression analysis. The main results of this study are as follows. First, the human brand of a soccer star has been shown to influence the attitude of the club in the order of ethicality, attractiveness, and differentiation. Second, the human brand of a soccer star has been shown to influence the attachment of the club in the order of ethicality, attractiveness, and differentiation.

Verification of The Effectiveness of Brand Identity of Youth Soccer Club in Korea (국내 유소년 축구클럽 브랜드 아이덴티티의 효과성 검증)

  • Jin-Ho Shin
    • Journal of the Korean Applied Science and Technology
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    • v.40 no.2
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    • pp.301-308
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    • 2023
  • This study sought to provide basic data for soccer clubs to establish efficient brand strategies by verifying the structural model and effectiveness between domestic youth soccer club brand identity, value, and loyalty. Therefore, parents of members of youth soccer clubs in Seoul, Gyeonggi-do, and Chungcheong-do were selected as samples, and 372 copies of data were used for the final analysis. Data processing used the SPSS (ver. 21.0) program to analyze frequency and verify reliability. In addition, the brushstrap BC method was applied to verify the effectiveness and significance of confirmatory factor analysis, correlation analysis, structural equation model analysis, and the effectiveness and significance using the AMOS (ver. 20.0). As a result of the study, first, it was found that the brand identity of youth soccer club in Korea had significant effect on value. Second, value had significant influence on loyalty. Third, brand identity had significant influence on loyalty. Lastly, value between brand identity and loyalty showed partial mediated effect.

The Effect of Perceived Overqualification on Loyalty through Benefits and Risks of Workers (지각된 과잉자격이 직장인의 혜택과 위험을 통해충성도에 미치는 영향)

  • Noh Hyeyoung;Lee Sin-Bok
    • The Journal of the Convergence on Culture Technology
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    • v.9 no.2
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    • pp.339-348
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    • 2023
  • Uncertainty in the employment market from the COVID-19 created incomplete employment. As a result, job seekers were required to have overqualifications than job requirements. In previous studies, overqualified workers by incomplete employment were not satisfied with their jobs. A representative result is the intention to change jobs. However, within COVID-19, the perceived overqualification of workers will appear differently. This is because in a rapidly increased employment competition environment due to COVID-19, it will appear as loyalty to maintain a stable job. As a result of this study, work experience was the greatest benefit and high risk for office workers. In addition, both the benefits and risks of overqualification affected loyalty. Unlike the negative impact as in previous studies, workers tried to remain stable at work in an unstable employment environment caused by COVID-19.

Study on virtual asset investment factors (가상자산 투자요인에 대한 연구)

  • Kim Sang-Mok;Yang Chang-Gyu;Lee Sin-Bok
    • The Journal of the Convergence on Culture Technology
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    • v.9 no.5
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    • pp.9-17
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    • 2023
  • Research on virtual assets has been mainly interested in policy preparation or legislation for the introduction of virtual assets, or virtual asset operation technology, but this study presents investment factors that most asset investors consider important when making investment decisions. By doing so, we came up with research results that are practically helpful to virtual asset investors. According to the research results, (1) virtual asset investors consider business models such as marketability and competitive advantage of virtual assets as the most important factors, and (2) are highly interested in factors that can be objectively judged when investing in virtual assets. The results of this study suggest that a virtual asset trading market environment that can provide objective investment information and discover various judgment factors that enable virtual asset investors to objectively judge virtual assets should be prepared, and that virtual asset businesses using core technologies will continue to grow. This suggests that a variety of policy support is needed to enable this.