• Nonlinear Functional Analysis and Applications
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• v.26 no.4
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• pp.781-792
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• 2021

In this paper, we study well-posed problems and variational inequalities in locally convex Hausdorff topological vector spaces. The necessary and sufficient conditions are obtained for the existence of solutions of variational inequality problems and quasi variational inequalities even when the underlying set K is not convex. In certain cases, solutions obtained are not unique. Moreover, counter examples are also presented for the authenticity of the main results.

• Proceedings of the Korean Society of Crop Science Conference
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• 2021.10a
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• pp.181-181
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• 2021

• Nonlinear Functional Analysis and Applications
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• v.29 no.2
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• pp.517-526
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• 2024

In this paper, some iterative methods are used to discuss the behavior of general mixed-harmonic variational inequalities. We employ the auxiliary principle technique and g-strongly harmonic monotonicity of the operator to obtain results on the existence of solutions to a generalized class of mixed harmonic variational inequality.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2008.04a
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• pp.203-208
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• 2008

Recently, high-rise building structures connected by a sky-bridge are frequently constructed. To predict accurate dynamic responses of structures connected a sky-bridge, time history analysis is required. Repetitive analyses are required in the design process. If the entire structure model is employed in the repetitive time history analysis, it would take a lot of computational time and engineers' efforts. Therefore, an equivalent model for high-rise building structures connected by a sky-bridge was proposed in this study. The proposed model consists of cantilever having original structure's stiffnesses and masses. Based on the analytical results, it has been shown that the equivalent model can reduce the analysis time and provide similar seismic responses to the original model.

• Tribology and Lubricants
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• v.12 no.3
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• pp.85-91
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• 1996

An analysis for turbulent hybrid beatings with fluid inertia and swirl injection effect was derived for studying static characteristics of swirl-controlled hybrid journal. The swirl-controlled hybrid journal beating is considered to have more freedom in stability control in high speed rotating machinery. Current analysis is compared with experimental results with 3-recess hydrostatic journal bearing. The analysis revealed that the fluid momentum exchange at orifice discharge could produce pressure rise inside the recess region which can control the shear flow induced by journal rotation. The analysis also shows that the swirl-controlled hybrid journal beating has a capability of controlling load carrying capacity and stability by manipulating supply pressure and injection angle.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2011.05a
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• pp.181-184
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• 2011

The earlier studies which are related to conflict management for urban regeneration project were based on limited case-studies on a specific phase. In addition, those studies did not considered a multidisciplinary approach for critical factor of conflict occurrence. In this reason, to establish a practical management or a policy is limited. In this paper, 'Good communication and information sharing' and 'Cooperativeness of stakeholders on project' are defined by critical factors for minimization of conflict between stakeholders. Furthermore we analysis the influence of those factors to minimization of conflict using path-analysis. This paper contributes to increase the efficiency of conflict management through understanding influence of each factors.

• Korea Trade Review
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• v.46 no.2
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• pp.1-18
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• 2021

Amid the growing importance and urgency of smartening in the Korean maritime logistics industry, this study conducted a survey on the status of Korea's maritime trade technology. Korea is on par with developed countries internationally, but in order to lead the digitalization of the future era, additional developments should be explored by reviewing current conditions. In particular, it is necessary to draw policy implications for smart shipping in Korea, which is a three-sided sea. This study derived technical implications by comparing the number of patent applications and the applicant for domestic and foreign patents related to the major technologies of the Fourth Industrial Revolution. In addition, it was intended to investigate and present the status of Korea's maritime trade technology through the analysis of smart shipping-related emotions and the analysis of positive and negative scores of companies related to sentiment analysis.

• New & Renewable Energy
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• v.7 no.3
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• pp.29-35
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• 2011

This paper describes an internal flow characteristics of a fuel pressurized blower, used for 1kW domestic fuel cell system. To analyze the flow field inside the diaphragm cavity, compressible unsteady numerical simulation is introduced. SST model with scalable wall function is employed to estimate the eddy viscosity. Moving mesh system is applied to the numerical analysis for describing the volume change of a diaphragm cavity in time. Throughout numerical simulation with the modeling of the inlet and outlet valves in a diaphragm cavity, unsteady nature of an internal flow is successfully analyzed. Force variations on the lower plate of a diaphragm cavity are evaluated in time. It is found that the driving force at the suction stage of a diaphragm cavity is more necessary than that at the discharging stage.

• Journal of Navigation and Port Research
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• v.34 no.7
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• pp.559-566
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• 2010

The container port industry has been variously studied by many researchers, because the contemporary container transportation and container port industries play a pivotal role in globalization of the world economy. For container terminals, the productivity, affected by many factors, is an important target in measuring container terminal performance. Under this background, finding the critical factors affecting the productivity is necessary. Regression analysis can be used to identify which independent variables are related to the dependent variable, and explore the relationships of them. The aim of paper is to evaluate the factors affecting the productivity of Chinese major terminals by using a regression statistical analysis modeling approach, which is to establish the variable preprocessing model (VPM) and regression analysis model (RAM), by means of collecting the major Chinese container terminals data in the year of 2008.