• Journal of the Korea Concrete Institute
• /
• v.14 no.6
• /
• pp.961-972
• /
• 2002

Flat plate structures under lateral load are susceptible to the brittle shear failure of plate-column connection. To prevent such brittle failure, strength and ductility of the connection should be ensured. However, according to previous studies, current design methods do not accurately estimate the strength of plate-column connection. In the present study, parametric study using nonlinear finite element analysis was performed for interior connections. Based on the numerical results, a design method for the connection was developed. At the critical sections around the connection coexist flexural moment and shear developed by lateral and gravity loads, and maximum allowable eccentric shear stresses were proposed based on the interactions between the flexural moment and shear, The proposed method can precisely predict the strength of the connection, compared with the current design provisions. The predictability of the proposed method was verified by the comparisons with existing experiments and nonlinear numerical analyses.

• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• v.17 no.6
• /
• pp.41-49
• /
• 2017

Theoretical modelling and computational results for frequency coordination are presented over mobile base station and fixed wireless systems in urban or sub-urban area. Computational results with key parameters needed for interference analysis are performed and discussed in terms of system characteristics, propagation model, protection ratio, frequency dependent rejection, and discrimination angle with signal-interference plane. Based upon minimum coupling loss methodology, calculated interference powers of victim receiver for assumed system parameters are compared with maximum allowable interference power derived from protection ratio as functions of discrimination angle and distance including height-gain model in urban or sub-urban area. The proposed method is applicable for technical analysis on co-existence or interoperability for the various wireless systems, mandatory for frequency coordination or reallocation process.

• Journal of the Institute of Electronics Engineers of Korea TC
• /
• v.47 no.7
• /
• pp.8-17
• /
• 2010

Ubiquitous home refers not only to home but also to logical space, including a wide range of out-home personal devices such as mobile phones, PDAs, laptops, car navigators, and office PCs. There are certain connection barriers among the devices, such as the dynamic IP address, NAT. In a home network, various devices coexist in heterogeneous networks, such as IP, IEEE1394, PLC, Bluetooth, ZigBee, UWB, and IrDA, all of which lack interoperability due to their different physical transmission characteristics and protocols. In ubiquitous home where an unrestricted collaboration of the devices is essential to offer services that meet the users' requirements, free interoperability among the devices must be guaranteed. This paper proposes a networking model for interoperability of the heterogeneous devices in a ubiquitous home based on a virtual overlay network which hides the complicated physical network configurations and heterogeneity of the service protocols.

• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• v.18 no.2
• /
• pp.63-72
• /
• 2018

Theoretical modelling and computational results for frequency coordination are presented based upon minimum coupling loss regarding the same or different wireless systems. Essential parameters involved in frequency coordination are discussed in view of system characteristics, propagation model, availability and protection ratio, frequency dependent rejection or adjacent channel interference ratio, discrimination angle, and its computational results are also evaluated. To illustrate frequency coordination procedure, received interference power between fixed wireless system of victim and mobile base station of interferer are analyzed in urban or sub-urban area and also compared with maximum allowable interference power as functions of discrimination angle and distance for assumed system parameters. The proposed method will play a practical role in technical analysis on co-existence or interoperability for the various wireless systems needed for frequency coordination.

• 한국해양학회지
• /
• v.28 no.3
• /
• pp.186-191
• /
• 1993

Scrippsiella trochoidea is a dinoflagellate responsible for red tide in early spring in southern coastal water. Marine bacteria appear to exert critical roles on the development and decay of phytoplankton bloom in marine ecosystem. It is likely that marine bacteria, Pseudomonas spp., share some metabolic processes with S. trochoidea. To investigate interactions between S. trochoidea and Pseudomonas spp. directly, cysts of S. trochoidea isolated from the bottom mud in Masan Bay have been germinated and cultured. From the S. trochoidea cultured medium, we have isolated Pseudomonas spp., a dominant and cultured. From the S. trochoidea cultured medium, we have isolated Pseudomonas spp., a dominant species. Both of Pseudomonas spp. and S trochoidea have been simultaneously inoculated into the sterilized sea water and cultured to examine the change of fatty acids. The major fatty acids that showed increases in composition during the dispecific culture were $C_{18:0/},{\;}C_{20:5}{\;}and{\;}C_{22:5}$ in S. trochoidea, and in Pseudomonas spp. Especially, $C_{20:5}{\;}and{\;}C_{18:0}$ were increased in S. trochoidea but decreased in Pseudomonas spp. These results strongly suggest that two species share some processes in their fatty acid metabolism.

• The Korean Society of Law and Medicine
• /
• v.16 no.1
• /
• pp.255-288
• /
• 2015

It is desirable to prevent medical accidents because they bring about irretrievable outcomes to patients, as they are directly related to each patient's life, and health. However, once medical accidents occur, it is appropriate to resolve them quickly without conflict before the feelings of directly involved people are intensely confronted with each other. Korea Consumer Agency carries out medical dispute mediation to address such disputes quickly, fairly, and efficiently, and so does Korea Medical Dispute Mediation and Arbitration Agency. Although there has been constant debate on a merge between the two agencies because of duplicated work and consequent inefficiency, it is desirable to maintain the two agencies to ensure consumers' options and to promote the mutual development of the agencies through competition. Therefore, there should be legal and systematical support for Korea Consumer Agency to have fair competition with Korea Medical Dispute Mediation and Arbitration Agency. This is not for Korea Consumer Agency, but ultimately for consumers.

• Korean Journal of Social Welfare
• /
• v.39
• /
• pp.74-102
• /
• 1999

The integrated global economic system have intensed Liberalization, dereguration, privatization. National states were subordinated in global economic system. To save social costs and to encourage the national competition power, the globalized market tends to reduce the domestic social expention. Truely anxious things are not the defectiveness of capitalism itself but neo-liberal measures of each national states. So neo-liberal globalization beat welfare states. Welfare and growth, accumulation and justice are inter-conflict elements, and these confliction is well explained in context of globalization. Stratigies of growth pursuing economic benefits subordinate social policy in economic policy. Globalization did not always reduce the power of national state, but each national states purposely reduce the power of state and state participations. Thus Globalization can be overcome and must be overcome, eventually, the history of social welfare in korea differ frome that of European states. Their's social welfare retrenchment have based on the excessly expeneded welfare provision, but the frame of social welfare in korea is not yet established in history. Fundamentally historic experiences between European and korean social welfare are different. So "the third way" in korea must be in carefull approaches and the social welfare policy in korea must purchase "anti-market policy" and the equal distribution.

• Journal of the Korea Computer Graphics Society
• /
• v.24 no.4
• /
• pp.11-20
• /
• 2018

Applications about systems integration of sensors and virtual environments have been developed increasingly. Accordingly, there is a need for the ability to represent, control, and manage physical sensors directly in a 3D virtual environment. In this research, a method of representing physical sensor devices in a 3D virtual environment has been defined using mixed and augmented reality, including virtual and real worlds, where sensors and virtual objects co-exist. The research is intended to control and manage various physical sensors through data sharing and interchange between heterogeneous computing environments. In order to achieve this, general sensor types have been classified, and a sensor based 3D scene graph for representing the functions of sensors has been defined. In addition, a sensor data model has been defined using the scene graph. Finally, a sensor 3D viewer has been implemented based on the scene graph and the data model so as to simulate the functions of sensors in indoor and outdoor 3D environments.

• The Journal of the Korea Contents Association
• /
• v.15 no.6
• /
• pp.62-72
• /
• 2015

The purpose of this study is to discuss new entrants' role in a business ecosystem and to analyze growth strategies of a new entrant in the movie industry. When participants of a business ecosystem complement one another with their own unique capabilities, they can coevolve and develop the business ecosystem. Especially, new entrants armed with competitive advantages are the key success factor for improving robustness of business ecosystem. Korean movie industry is dominated by a few large enterprises and thereby threatening fair trade. In an effort to encourage new entrants in the industry, this study analyzed success factors of a film distributor, Next Entertainment World(NEW). The success factors include unique criteria in selecting scenarios, quality management, rapid decision making process, and competent management team. Implications for the results and the future study are discussed.

• Journal of Korean Society of Steel Construction
• /
• v.20 no.6
• /
• pp.751-759
• /
• 2008

In this study, the effect of an unsteady flow field around a body of aerostatic/aerodynamic forces were investigated using rectangular cylinders (B/D = 2, 3, 4, 5). Proper orthogonal decomposition (POD) was introduced to the analysis of the fluctuating pressure field that was measured on the stationary/oscillatory B/D=4 rectangular cylinder, and the characteristics of the proper functions with flow patterns were identified. In addition, the physical decoupling and interactions in the different co-existing flow patterns were investigated through POD. The comparison with the identified proper function associated with a particular flow pattern revealed that the Karman vortex is almost not affected by the separation bubble, but that the Karman vortex considerably interferes in the development of the separation bubble around the trailing edge. It can be considered that the Karman vortex induces the increment of the curvature of the substantial separated flow.