• 한국원자력학회:학술대회논문집
• /
• 한국원자력학회 1996년도 춘계학술발표회논문집(3)
• /
• pp.15-20
• /
• 1996

The nonlinear dynamic analyses were performed by newly developing an appropriate impact modelling for the evaluation of the CANFLEX fuel bundle structural integrity during the refuelling period. The initial load under the refuelling condition is considered as initial velocity at impact incident, and the impact of one bundle contacted another bundle for at short time is studied by performing several dynamic analysis method. The impact analysis shows to predict an appropriate velocity and acceleration profile according to load time history for two bundles impact.

• 한국도서관정보학회지
• /
• 제46권1호
• /
• pp.65-81
• /
• 2015

Altmetrics는 각종 연구성과물의 영향을 소셜미디어, 언론보도, 참고문헌관리도구 등으로부터 수집하여 다차원적으로 분석함으로써 기존 방식에서는 찾아낼 수 없었던 사회적 영향도를 측정하는 기법이다. 최근 학술커뮤니케이션 방식이 다양해지고, 오픈 엑세스 문화에 의해 다양한 분야의 논문을 저장하고 배포할 수 있는 OA 레포지토리가 활성화되면서 아티클 단위의 영향력을 다면적 복합적으로 측정할 수 있는 새로운 평가 체계에 대한 고민이 시작되고 있다. 본 연구는 Altmetrcis의 등장 배경, 응용 현황과 장단점에 대해 고찰하며, 실제 오픈소스 기반의 Altmetrcis 측정 도구인 ImpactStory를 활용하여 국제학술지에 출판된 한중일 디지털도서관 관련 논문의 영향력을 살펴보고 피인용도와 어떠한 상관성을 나타내는지 분석하였다. Altmetrcis 측정 결과, 분석된 연구는 참고문헌관리도구에 'saved'된 경우가 소셜 미디어에 의해 'discussed'되거나, 후속연구에 의해 'cited'된 빈도보다 더 높게 나타났으며, 'saved'와 'cited'와 간에는 양의 상관성(r = 0.718)이 존재하는 것으로 나타났다. 한편, 분석 대상 논문을 한중일로 구분하여 영향력 차이를 비교 분석한 결과, 한국은 일본과 중국에 비해 'saved' 빈도가 높은 것으로 나타났다.

• 대한조선학회논문집
• /
• 제52권5호
• /
• pp.418-424
• /
• 2015

This paper is about the bow structure design of the ship-typed and turret moored FPSO which is subjected to the bow-flare slamming load in harsh North Sea environments. Quad 204 FPSO project involves the redevelopment of the existing Schiehallion FPSO which is damaged by impact wave loads. Normally all offshore systems including FPSO are designed to withstand the 100 year storm I.e. the storm that happens once every hundred years at the location where the system is installed. Several incidents have revealed that impact loading is important issue for moored floating production systems. In this paper, the design impact loads are estimated considering the ship owner’s specification, measured data from model tests, requirements of the classification society rules and results of numerical simulation analyses. The impact pressure by numerical analysis is 1.8 times greater than required value by CSR adopted by IACS. Based on the selected design load, plastic design formulae allowing the local material yielding are applied for the initial scantling of the bow structure. To verify the structural integrity, FE analyses are carried out considering the local area subjected to the impact wave loads. Their results such as structural arrangement, design loads and scantlings are shown and discussed. It is found that plastic design formulae in adopting Initial design phase give sufficiently conservative results in terms of structural strength.

• The Korean Journal of Pain
• /
• 제34권2호
• /
• pp.139-155
• /
• 2021

The quality of subgroup analyses (SGAs) in chronic non-cancer pain trials is uncertain. The purpose of this study was to address this issue. We conducted a comprehensive search in MEDLINE and EMBASE from January 2012 to September 2018 to identify eligible trials. Two pairs of reviewers assessed the quality of the SGAs and the credibility of subgroup claims using the 10 criteria developed by Sun et al. in 2012. The associations between the quality of the SGAs and the studies' characteristics including risk of bias, funding sources, sample size, and the latest impact factor, were assessed using multivariable logistic regression. Our search retrieved 3,401 articles of which 66 were eligible. The total number of SGAs was 177 of which 52 (29.4%) made a subgroup claim. Of these, only 15 (8.5%) were evaluated as being of high quality. Among the 30 SGAs that claimed subgroup effects using an appropriate method of performing interaction tests, the credibility of only 5 were assessed as high. None of the subgroup claims met all the credibility criteria. No significant association was found between the quality of SGAs and the studies' characteristics. The quality of the SGAs performed in chronic pain trials was poor. To enhance the quality of SGAs, scholars should consider the developed criteria when designing and conducting trials, particularly those which need to be specified a priori.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2003년도 춘계학술대회 논문집
• /
• pp.1341-1344
• /
• 2003

Studies on impact damage of composite laminate shells were fewer compared with those on impact behaviors to analyze time-load, displacement-load and impact energy - energy absorption. Up to date the studies were not enough to demonstrate suitability of their results because they were dependent on theories and numerical analyses. In particular, it is a well-known fact that there was a correlation between initial peak load and damage resistance of composite material flat plates imposed with low-speed impact, but studies on composite material shells with curvature were also very few. Actually structures such as wings or moving bodies of airplanes, motor cases and pressure containers of rockets are circular. And as low-speed impact load is imposed for optimal design of take-off and landing, and containers of airplanes, it is very important to analyze evaluation of behaviors and damaged areas. Therefore, in this paper to evaluate the impact characteristics of the CFRP laminate shell according to size of curvature quantitatively, it was to identify energy absorption and impact damage instruments according to change of impact speed.

• Genomics & Informatics
• /
• 제1권2호
• /
• pp.87-93
• /
• 2003

DNA microarray is currently the most prominent tool for investigating large-scale gene expression data. Different algorithms for measuring gene expression levels from scanned images of microarray experiments may significantly impact the following steps of functional genomic analyses. $Affymetrix^{(R)}$ recently introduced high-density microarrays and new statistical algorithms in Microarray Suit (MAS) version 5.0$^{(R)}$. Very high correlations (0.92 - 0.97) between the new algorithms and the old algorithms (MAS 4.0) across several species and conditions were reported. We found that the column-wise array correlations had a tendency to be much higher than the row-wise gene correlations, which may be much more meaningful in the following higher-order data analyses including clustering and pattern analyses. In this paper, not only the detailed comparison of the two sets of algorithms is illustrated, but the impact of the introducing new algorithms on the further clustering analysis of microarray data and of possible pitfalls in mixing the old and the new algorithms were also described.

• Structural Engineering and Mechanics
• /
• 제77권2호
• /
• pp.293-304
• /
• 2021

Structural failure due to seismic pounding between two adjacent buildings is one of the major concerns in the context of structural damage. Pounding between adjacent structures is a commonly observed phenomenon during major earthquakes. When modelling the structural response, stiffness of impact spring elements is considered to be one of the most important parameters when the impact force during collision of adjacent buildings is calculated. Determining valid and realistic stiffness values is essential in numerical simulations of pounding forces between adjacent buildings in order to achieve reasonable results. Several impact model stiffness values have been presented by various researchers to simulate pounding forces between adjacent structures. These values were mathematically calculated or estimated. In this study, a linear spring impact element model is used to simulate the pounding forces between two adjacent structures. An experimental model reported in literature was adopted to investigate the effect of different impact element stiffness k on the force intensity and number of impacts simulated by Finite Element (FE) analysis. Several numerical analyses have been conducted using SAP2000 and the collected results were used for further mathematical evaluations. The results of this study concluded the major factors that may actualise the stiffness value for impact element models. The number of impacts and the maximum impact force were found to be the core concept for finding the optimal range of stiffness values. For the experimental model investigated, the range of optimal stiffness values has also been presented and discussed.

• International Journal of Human Ecology
• /
• 제7권1호
• /
• pp.131-144
• /
• 2006

This study examined the impact of childhood physical abuse on the self-concept of older adolescents and assessed perceptions of parental relationships as a mediator for consequences of abuse. Sixty-college undergraduates (aged 18-23 yrs.) completed this study. (1) The Self-Description Questionnaires, a multidimensional measure of self-concept, (2) the parent scales of the inventory parent and Peer Attachment, a measure of perceived parental support, and (3) the Assessing Environments, a retrospective report of family environment and parenting practices. Analyses, controlling for SES and education, showed that a history of physical abuse was a strong predictive of adolescence current self-concept. Further analyses would lend support to a mediation model, suggesting that physical abuse had a negative impact on self-concept through its negative effect on parent-child relationships.

• 한국지반공학회:학술대회논문집
• /
• 한국지반공학회 2005년도 춘계 학술발표회 논문집
• /
• pp.41-48
• /
• 2005

A small scale impact apparatus, pressuremter and soil chamber were used to investigate horizontal behavior and bearing capacity of the steel guardrail post installed in compacted soil. A useful test and data reduction method for pressuremter was developed to evaluate soil parameters of surrounding soil and stability of the post. From the analyses of the PMT, horizontal bearing capacity of the post impacted by a boggie was 12.7% bigger than that of the post with static loading. The increased horizontal bearing capacity is due to generated inertia force that is dependent on the shape of failed soil wedge around the post. P-y curves were obtained from the pressuremeter test and were applied to a finite difference program which predicted a load-deflection and a bending moment contours along the post.

• 한국군사과학기술학회지
• /
• 제13권1호
• /
• pp.22-29
• /
• 2010

In this study, computational multi-body dynamics and structural vibration analyses including some impact condition have been conducted for the ground flight test system of the developed smart UAV model. Designed ground test system has four degree-of-freedom motions with limited motion control mechanism. Design safety margin designs for several structural components are tested and verified considering expected critical motions (pitching and rolling) of the test smart UAV model. Computational results for various analysis conditions are practically presented in detail. Futhermore, proper design modifications of the initially designed test equipment in order to guarantee or increase structural safety have been successfully conducted in the design stage.