• 대한예방한의학회지
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• 제6권1호
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• pp.129-139
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• 2002

This research purpose was to get urine and hair metal correlation by Spearman methods in subjects with long term intake of herbal medicine. And that result can help research for metal absorption mechanism in body. Subjects have been intake 1-124 months(7.55 months mean) in decoction and 1-60 months (1.27 months means) for some disease treatment in sampling point. 1) Metal concentrations in urine and hair of study subjects showed higher than WHO reference limits, especially 0.32-6.17% in urine and 11.69-26.95% in hair. 2) Metal concentration in urine correlated 0.37(p〈0.001) Cu to Cd, 0.37(p〈0.001) Pb to Cu, 0.29(p〈0.001) Pb to Cu, 0.29(p〈0.001) Pb to Cd, and 0.36(p〈0.001) Pb to Cu, -0.13(p〈0.05) Hg to Cu in hair. Also between urine and hair correlated 0.21(p〈0.001) Cd to Cd. 0.17(p〈0.01) Pb to Pb, -0.06 Cu to Hg, -0.01 Hg to Cu. These results showed that occur physical and chemical reaction among many metals in body, respectively. However, further study related this subjects will be need.

• 한국환경복원기술학회지
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• 제18권1호
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• pp.135-151
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• 2015

DMZ is considered as an ecologically sensitive landscape and one of the highest biodiversity regions in the Republic of Korea. There have been, albeit the significant value, increased interests in developing this region for a variety of purposes including tourism and commemorative events. As this region has been already facing a range of problems derived from previous development, natural disaster and invasive species, the necessity for active management of ecological health within this region has been increased, which weighs the importance of executing ecological restoration. The objective of this study was to develop evaluation indices as an effective management means of properly evaluating ecological restoration and sustainably maintaining the restored conditions on a long-term scale. Through literature review existing evaluation indices related to restoration were collected, and then the most suitable indices were selected based upon two interviews and one questionnaire survey targeting experts in the relevant field to ecological restoration. They were categorized by two major division and their subclasses (Ecological base - vegetation structure & composition, habitat characteristics, soil environment; landscape ecology - connectivity, landscape patch, boundary & surrounding) and 40 indices. These indices were considered helpful to comprehensively evaluate ecological restoration on degraded environments within ecologically sensitive areas, and sustainably manage target areas by employing a long-term monitoring approach. As this result played a meaningful role in providing the fundamentals of evaluating ecological restoration, it should develop a suitable evaluation system through further research.

• Journal of Periodontal and Implant Science
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• 제44권3호
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• pp.102-108
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• 2014

Purpose: Rehabilitation of the incomplete dentition by means of osseointegrated dental implants represents a highly predictable and widespread therapy; however, little is known about potential risk factors that may impair long-term implant success. Methods: From 2004 to 2012, a total of 13,147 implants were placed in 4,316 patients at the Academy for Oral Implantology in Vienna. The survival rates after 8 years of follow-up were computed using the Kaplan-Meier method, and the impact of patient- and implant-related risk factors was assessed. Results: Overall implant survival was 97% and was not associated with implant length (P=0.930), implant diameter (P=0.704), jaw location (P=0.545), implant position (P=0.450), local bone quality (P=0.398), previous bone augmentation surgery (P=0.617), or patient-related factors including osteoporosis (P=0.661), age (P=0.575), or diabetes mellitus (P=0.928). However, smoking increased the risk of implant failure by 3 folds (P<0.001) and a positive history of periodontal disease doubled the failure risk (P=0.001). Conclusions: Summing up the long-term results of well over 10,000 implants at the Academy for Oral Implantology in Vienna it can be concluded that there is only a limited number of patients that do not qualify for implant therapy and may thus not benefit from improved quality of life associated with fixed implant-retained prostheses.

• 폴리머
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• 제32권5호
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• pp.440-445
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• 2008

정수압 상태의 선형저밀도 폴리에틸렌 튜빙의 파손 메커니즘과 파손 모폴로지를 연구하였다. 비디오현미경과 주사전자현미경을 이용한 관찰 결과, 선형저밀도 폴리에틸렌 튜빙의 파손모드는 내면에서 외면으로 진전되는 크랙을 수반하는 취성파괴임을 확인하였다. 또한 산화유발시간과 적외선분광분석을 통하여, 파손된 선형저밀도 플리에틸렌 튜빙의 단면상에 열화에 의한 발열 피크와 카르보닐 피크의 증가를 관찰하였다. 열 가속에 의한 음력과 수명특성 사이의 관계를 고려한 선형저밀도 폴리에틸렌 튜빙의 가속수명시험법 및 시험장치를 개발하였다. 선형저밀도 폴리에틸렌 튜빙의 장기 정수압 상태의 수명을 예측하기 위해 아레니우스 모델과 와이블 분포를 적용한 통계학적 기법을 도입하였다. 그 결과, 사용온도 $25^{\circ}C$에서의 선형저밀도 폴리에틸렌 튜빙의 장기수명을 평가/분석하였다.

• 기록학연구
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• 제21호
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• pp.355-383
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• 2009

기록관리 공동체의 사명은 한국사회의 어제와 오늘을 담은 기록을 수집하고, 안전하게 관리하여 다음 세대로 전승하는 데 있다. 지난 10년간 우리 기록관리 공동체는 이 사명을 책임 있게 완수하기 위해 다각적인 활동을 벌였고 어느 정도 그 성과를 이루었다. 그러나 지난 한 해 동안 벌어진 일련의 사건은 앞으로 이루어야 할 과업에 비해 지금까지 이룬 성과라고 하는 것이 너무나 빈약하다는 것을 절감할 수밖에 없게 했다. 이 논문의 목적은 전자기록관리와 관련하여 그 동안 이룬 성과와 앞으로의 과제를 점검하는 데 있다. 우선 전자기록이 '기록'으로서 갖는 속성과 '전자' 형태를 취함으로서 갖게 되는 속성을 검토하는 데에서 시작하여, 전자기록의 장기 보존 대책의 전반적 현황을 살펴 볼 것이다. 그리고 앞으로 남은 과제를 전자기록관리원칙에 기반 한 정책, 통합적 전자기록관리 체제, 장기보존 기능 개발과 구현, 그리고 지식확산과 협력의 네 가지 측면에서 제안하고자 한다.

• 대한금속재료학회지
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• 제46권3호
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• pp.118-124
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• 2008

Abstract: A minimum commitment method(MCM) was applied to predict the long-term creep rupture life for type 316LN stainless steel(SS). Lots of the creep-rupture data for the type 316LN SS were collected through world-wide literature surveys and the experimental data of KAERI. Using these data, the long-term creep rupture life above ${10}^5$ hour was predicted by means of the MCM. In order to obtain the most appropriate value for the constant A being used in the MCM equation, trial and error method was used for the wide ranges from -0.12 to 0.12, and the best value was determined by using the coefficient of determination, $R^2$ which is a statistical parameter. A suitable value for the A in type 316LN stainless steel was found to be at -0.02 ~ -0.05 ranges. It is considered that the MCM will be superior in creep-life prediction to commonly-used timetemperature parametric method, because the P(T) and G($\sigma$) functions are determined from the regression method based on experimental data.

• 한국비블리아학회지
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• 제20권1호
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• pp.119-135
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• 2009

이 연구의 목적은 현재 우리나라 도서관 상황에 가장 적합하다고 보이는 미래지향적 국립중앙도서관 분관의 중 장기 건립 방안을 제시하는 것이다. 이 연구에서는 지금까지 다양한 측면에서 논의된 국립중앙도서관 분관 건립(안)에 대한 대안으로서 "양극-다기화" 체제를 제안하였다. 이는 우선 하나의 직할 분관 건립에 주력하여 국가도서관 체제의 양축을 구성하고, 장기적으로 필요시 복수의 분야별 국립도서관을 건립할 수 있음을 의미한다. 이 연구에서는 이를 시발점으로 한 국가도서관 발전체제 구축 방향을 다음과 같이 제안하였다. 첫째, 직할 분관, 분야별 국립도서관, 지역대표도서관의 협력 체제 확립과 국가 차원의 전국적 도서관서비스의 연계 협력 모형 구축 및 중 장기 정책의 일관성과 지속성을 유지하고, 둘째, 실질적인 예산 확보 및 제반 정책적 지원 방안 강구하며, 셋째, 국내 도서관들 간 지역별 도서관 협력체계의 국가적 차원 연계 및 각급 도서관의 역할 정립을 지원하고, 넷째, 국가의 지속가능한 도서관 발전정책의 방향을 모색하였다.

• 무역상무연구
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• 제69권
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• pp.427-451
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• 2016

With WTO system starting since 1995, the international trade business has been getting more competitive and fairer especially with the agreement on subsidies and countervailing measures. The export credit insurance, as the only institution of supporting export business under WTO system, is getting more significant in major economies as an indirect means to support export business. In China, SINOSURE has been monopolizing its export credit insurance market for a long time. Since January 2013, however, the Chinese government permitted several commercial insurers to compete in the market and they include PICC, PING AN, CPIC, China Re. This study is to discuss how to improve the Chinese export credit insurance after analyzing performance of privatization of short-term credit insurance and real cases of success and failures. With the 'Go Global' and 'One Belt, One Road' policy of Chinese government, the role of export credit insurance is expected to be more significant. Thanks to the Korea-China FTA since December 2015, international trade between the two countries will be greater especially in finance and insurance area. Because Korean insurance industry is very much interested in getting into Chinese export credit insurance market, they need to study carefully the performance of privatization of Chinese short-term export credit insurance. For their policy decision makings the Korean authorities need to get lessons from the privatization of Chinese short-term export credit insurance business.

• Structural Engineering and Mechanics
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• 제11권6호
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• pp.637-650
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• 2001

A structural analysis of cracked R.C. members under instantaneous or sustained loads and imposed displacements is presented. In the first part of the paper the problem of deriving feasible moment-curvature diagrams for a long term analysis of R.C. sections is approached in an exact way by using the Reduced Relaxation Function Method in state I uncracked and the method suggested by CEB in state II cracked. In both states the analysis of the main parameters governing the problem has shown that it is possible to describe the concrete creep behaviour in an approximate way by using the algebraic formulation connected to the Effective Modulus Method. In this way the calculations become quite simple and can be applied in design practice without introducing significant errors. Referring to continuous beams, the structural analysis is then approached in a general way, applying the Force Method and the Principle of Virtual Works. Finally, considering single members, the structural analysis is performed by means of a graphical procedure based on the application of feasible moment-rotation diagrams which allow to easily solve various structural problems and to point out the most interesting aspects of the long term behaviour of cracked R.C. members with rigid or elastically deformable redundant restraints.

• Molecules and Cells
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• 제27권1호
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• pp.5-14
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• 2009

The availability of effective vaccines has had the most profound positive effect on improving the quality of public health by preventing infectious diseases. Despite many successful vaccines, there are still old and new emerging pathogens against which there is no vaccine available. A better understanding of how vaccines work for providing protection will help to improve current vaccines as well as to develop effective vaccines against pathogens for which we do not have a proper means to control. Recent studies have focused on innate immunity as the first line of host defense and its role in inducing adaptive immunity; such studies have been an intense area of research, which will reveal the immunological mechanisms how vaccines work for protection. Toll-like receptors (TLRs), a family of receptors for pathogen-associated molecular patterns on cells of the innate immune system, play a critical role in detecting and responding to microbial infections. Importantly, the innate immune system modulates the quantity and quality of long-term T and B cell memory and protective immune responses to pathogens. Limited studies suggest that vaccines which mimic natural infection and/or the structure of pathogens seem to be effective in inducing long-term protective immunity. A better understanding of the similarities and differences of the molecular and cellular events in host responses to vaccination and pathogen infection would enable the rationale for design of novel preventive measures against many challenging pathogens.