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Incheon, South Korea

Kim S.-B.,Research and Development Team | Kim S.-B.,Yonsei University | You J.H.,Yonsei University | Kwon O.-Y.,Yonsei University | Yi C.-H.,Yonsei University
American Journal of Sports Medicine | Year: 2015

Background: While the biomechanical characteristics of the golf swing are well established, the lumbopelvic kinematic characteristics of professional golfers with limited hip internal rotation warrant further investigation. Purpose: The specific aim was to ascertain mechanical differences in lumbopelvic-hip movement of asymptomatic professional golfers with and without limited hip internal rotation during the golf swing. Study Design: Controlled laboratory study. Methods: Thirty professional male golfers (aged 25-35 years and 0 handicap matched) were classified into either the limited hip internal motion (LHIM) group (range of motion<20°) or the normal hip internal motion (NHIM) group (range of motion ≥30°). All participants underwent clinical tests (muscle strength, muscle length, and range of motion) and a biomechanical assessment using 8 infrared optic cameras in a motion analysis system. Independent t tests were performed to determine potential mean differences in muscle strength, length, and range of motion and lumbopelvic kinematics at P<.05. Results: Kinematic analysis revealed that the LHIM group showed significantly greater lumbar flexion (P<.001), right and left axial rotation (P<.025), and right-side lateral bending (P = .003) than the NHIM group. A greater pelvic posterior tilt was observed in the LHIM group when compared with the NHIM group (P = .021). Clinical tests showed reduced internal rotator muscle strength and shorter muscle length in the iliopsoas (P = .017) and hamstring (P<.001) among those in the LHIM group when compared with the NHIM group. Clinical Relevance: The study data suggest that constraints to hip joint internal rotation, along with muscle strength imbalances between the agonist and antagonist muscles and muscle tightness, are associated with substantially greater lumbopelvic movement during the golf swing. © 2014 The Author(s).

Mateo R.M.A.,Research and Development Team
Procedia Computer Science | Year: 2013

Recently, researchers have been exploring the idea of robots that rely on cloud-computing infrastructure to take advantage of processing power and access vast amounts of data. This approach allows a robot to delegate compute-intensive tasks like image recognition, graphical mapping systems and etc. However, the efficient information sharing of cloud-enabled robots is not addressed which is necessary in disseminating real time information. In this paper, a collaboration framework is presented which is designed for information sharing of cloud-enabled robots. Based on attributes, cloud-enabled robots form logical groups to perform information sharing through the Internet. To provide a faster way of disseminating messages, a scalable adaptive group communication (SAGC) is proposed. The logical groups are processed using fuzzy system to employ scalable grouping, and then, the logical links are adjusted by a node link weight function based on Brownian agent to direct the queries to robots with relevant information. The performance evaluation showed that the SAGC had the fastest response to queries compared to other group communication methods. © 2013 The Authors.

Battista W.,Center for Ocean Solutions | Kelly R.P.,Center for Ocean Solutions | Erickson A.,Center for Ocean Solutions | Fujita R.,Research and Development Team
Coastal Management | Year: 2016

A recent metaanalysis identified certain management attributes that are associated with successful management of threshold-based systems. However, high variance among case studies indicates that these attributes do not guarantee good conservation outcomes, suggesting that additional factors may be at play. To better understand these additional factors, we compiled a list of effective governance attributes from the literature, and developed guidance for systematically evaluating their presence, absence, and the extent to which each attribute is actually manifested in a given case study. We also examine the distribution of rights and responsibilities within a system, and the resulting impacts on stewardship incentives. Here we present the results of this analysis as applied to Kane'ohe Bay, Hawai'i. Our results confirm that absent or incomplete effective governance attributes can negatively impact conservation outcomes. In Kane'ohe Bay, a public-private partnership temporarily compensated for gaps and weaknesses in the governance system, thereby creating conditions conducive to successfully reducing populations of invasive algae. However, this partnership has since dissolved and current capacity to address this and other issues in this system is again lacking. Failure to fix governance weaknesses may compromise the continued health and functioning of the Kane'ohe Bay system. © 2016 Taylor & Francis

Jung J.,Pohang University of Science and Technology | Yoon S.C.,Research and Development Team | Jun H.-J.,Korea Atomic Energy Research Institute | Kim H.S.,Pohang University of Science and Technology
Journal of Materials Engineering and Performance | Year: 2013

Equal channel angular pressing (ECAP) is the most promising and interesting process for refining the grain size to an ultrafine grain or nanosize by imposing severe plastic deformation into the workpiece and repeating the process while maintaining the original cross-section of the workpiece. In this paper, we simulated the batch type ECAP and the continuous type equal channel multi-angular pressing (ECMAP), which can impose large deformation by repeating the shear deformation, using the finite element method and investigated the similarity and difference of the two processes. In particular, modified die design of the continuous type ECMAP was proposed for strain uniformity. © 2013 ASM International.

Kim S.-H.,Research and Development Team
Transactions of the Korean Institute of Electrical Engineers | Year: 2014

With the development of the electronics industry and widespread supply of many different electrical appliances, the factors of the electrical fires are also diversified. For this reason, the fuse, safety-critical component, needs accurate and stable operating characteristics for preventing various fire factor, and also needs various operating characteristics. Especially when the all electrical resistance are dropped by internal short of circuit, high current inrushes and makes the fire. In order to prevent this, very fast acting fuses should be applied. However, existing very fast acting characteristics fuse has less wire dimension of element Ag100% metal than that of fast acting fuse, and it is made of plating with low melting point metals, so it satisfy very fast acting but it can't satisfy durability and safety. For this reason, in this study, through the analyzing fusing characteristics of Ag-Cu alloy composition, the new alloy composition, which implement to very fast acting fuse without decrease of fuse elements dimension, is suggested. And this study classify the operating characteristics changes, a resistance change, and the rated current of the fuse in the overall composition change of Ag-Cu alloying, and it can be utilized for designing fuse.

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