• Journal of Dental Rehabilitation and Applied Science
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• v.22 no.1
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• pp.11-21
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• 2006

The adjustable dental impression trays were made for being adjusted their width automatically along the width of patient's dental arch. The purpose of this study was to investigate the retentive force of adjustable dental impression trays made of different synthetic resin materials. Three pairs of adjustable trays were made of ABS(acrylonitrile butadiene styrene) synthetic resin, polyurethane synthetic resin and polycarbonate synthetic resin with a hole and without a rim on the border area of them. The experiment was done with the horse-shoe shaped metal plate to pull out the set impression body from the tray jig which was made for holding the tray on the lower part of Universal Testing Machine(UTM, Zwick Z020, Zwick Co., Germany). After the alginate impression in the tray was allowed to set four minutes, a tensile force was applied at right angles to the tray which had been previously seated on the jig. The force was applied to measure a maximum force by use of UTM at a constant strain rate 100mm per minute. The results obtained in this study were as follows : 1. The upper trays were showed higher retentive force than lower trays in three tray materials. 2. There was no significant difference in the retentive force of the tray materials(p>0.05).

• The Transactions of the Korean Institute of Power Electronics
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• v.12 no.1
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• pp.89-97
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• 2007

This paper describes a load simulator with power recovery capability, which is based on the voltage source converter-inverter set. The load simulator can save the electric energy that should be consumed to test the operation and performance of the power quality compensator and the power equipment. The load simulator consists of a converter-inverter set with a DSP controller for system control and PWM pulse generation. The converter operates as a universal load to model the linear load and the non-linear load, while the inverter feed the energy back to the power source with harmonic compensation. the performance of proposed load simulator was analyzed with scaled-model experiment, interconnected with the active power filter. The experimental results confirms that the proposed load simulator can be utilized to test the performance of active power filter.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.12 no.1
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• pp.60-70
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• 1987

Recently the tendency of the network system development rapidly progresses toward ISDN that intergrates all presetn-day communication networks and services into a single, universal network set up on the basis of the exisiting telephone network. For this reason many countries pay worldwide attention to the researches about ISDN, especially to the researches about the exchange and the ISDN user-network interface which is one of the most important parts of network system. This paper is the first part of the two-par papers describing the ISDN user-network interface. in this paper, after surveying the architecture of ISDN exchange recommended by CCITT, the general architecture of the ISDN exchage is proposed, Based on this architecture, the switching emulator is implemented, and the necessary conditions of the ISDN exchage(LAPO, CCP etc) are also studied.

• Lingua Humanitatis
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• v.7
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• pp.93-122
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• 2005

China, the nation which reigns the society consisted of several ethnic groups, has been interested in universal virtues since its early eras, due to the social demand for their integration. Confucianism, therefore, traditionally has been executing this function as a transcendant world, and at present the Marxism takes its role instead. After its reformation and opening, the market economy was allowed to set in China, which means that the traditional ideology of integration comes to face the crisis occurred by new trend of the individualism which is gradually spreading. The people who make the policies and the intellectual people in China who noticed these phenomena, are trying to make measures to cope with this contradiction. Despite of their trials, they are destined to find nothing but powerlessness in front of the powerful marketing strategy of the commercialism which adroitly adapted to their measures. In this situation, the transcendant world to reach, which these people are appealing again is the totalitarian ideology that persistently has been maintained through history of China. The movie, Hero, is the one of these attempts. This paper offers you the analysis of this cultural agony of contemporary China.

• Journal of Institute of Control, Robotics and Systems
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• v.17 no.7
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• pp.685-696
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• 2011

An efficient laparoscope manipulator robot was designed to automatically control the position of laparoscope via a passive joint on end-effector position. The end position of the manipulator is controlled to have corresponding velocity defined in the global coordinate space using laparoscopic visual information. Desired spatial position of laparoscope was derived from detected positions of surgical instrument tips, then the clinical viewing plane was moved by visual servoing task. The laparoscope manipulator is advantageous for automatically maintaining clinically important views in the laparoscopic image without any additional operator. A laparoscope is mounted to a holder which is linked to four degree of freedom manipulator via universal joint-type passive rings connection. No change in the design of laparoscope or manipulator is necessary for its application to surgery assistant robot system. Expanded working space and surgical efficiency were accomplished by implementing slant linking structure between laparoscope and manipulator. To ensure reliable positioning accuracy and controllability, the motion of laparoscope in an abdominal space through trocar was inspected using geometrical analysis. A designed laparoscope manipulating robot system can be easily set up and controlled in an operation room since it has a few subsidiary devices such as a laparoscope light source regulator, a control PC, and a power supply.

• Smart Structures and Systems
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• v.16 no.6
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• pp.1003-1021
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• 2015

MR dampers have been proposed for the control of cable vibration of cable-stayed bridge in recent years due to their high performance and low energy consumption. However, the highly nonlinear feature of MR dampers makes them difficult to be designed with efficient semi-active control algorithms. Simulation study has previously been carried out on the cable-MR damper system using a semi-active control algorithm derived based on the universal design curve of dampers and a bilinear mechanical model of the MR damper. This paper aims to verify the effectiveness of the MR damper for mitigating cable vibration through a full-scale experimental test, using the same semi-active control strategy as in the simulation study. A long stay cable fabricated for a real bridge was set-up with the MR damper installed. The cable was excited under both free and forced vibrations. Different test scenarios were considered where the MR damper was tuned as passive damper with minimum or maximum input current, or the input current of the damper was changed according to the proposed semi-active control algorithm. The effectiveness of the MR damper for controlling the cable vibration was assessed through computing the damping ratio of the cable for free vibration and the root mean square value of acceleration of the cable for forced vibration.

• Korean Institute of Interior Design Journal
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• no.25
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• pp.49-60
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• 2000

This study mainly aims to address the housing requirements of senior citizens through meeting their basic needs for physical housing while valuing the particular human needs and demands of older people. As the number and frequency of their social ties decrease, senior citizens spend most of their time at home. As a result, they suffer a larger number of accidents in the home. Although carelessness is a cause, the main reason for seniors household accidents is that the general structure, fixtures and appliances of housing do not take into account the particular needs of older people. This study investigates the accident patterns of older people, addresses structural obstructions, and proposes guidelines for ergonomic interior design and household management which take into account universal design and the special needs of senior citizens. This study explores the following: 1) Accident causes and patterns in senior households, as the specific characteristics, requirements of older people. 2) An analysis of safety improvement plans and application. 3) Determining each rooms layout by functional requirement. 4) A final set of proposed interior design guidelines for senior housing.

• Korean Institute of Interior Design Journal
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• v.25 no.6
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• pp.23-31
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• 2016

The study aims to identify the existing problems and suggests the implication for the planning of emergency shelter in terms of users' habitability. The results of the study show that the concept of shelters for disaster victims need to set up and be distinctively defined as emergency phase and temporary residency phase. In emergency phase, the various types of buildings and facilities should be considered as temporary shelters for disaster victims such as transitional shelters including the public facilities. Based on the results of the critical review, this research proposed an analytic framework emphasizing habitability for disaster victims including vulnerable people such as the disabled, the aged, women and children. The framework is composed of four dimensions: safety, health, convenience and comfortability. The manual guidelines for emergency shelters should reflect the barrier-free design or universal design for various types of disaster victims considering habitability to provide the positive opportunity and future hope for restoration after disaster. This research can be a basis for the planning and application of temporary shelters for disaster victims.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 2006.06a
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• pp.457-462
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• 2006

In UMTS (Universal Mobile Telecommunication System), a protocol called UMTS AKA is used to authenticate MSs (Mobile Stations). When an MS is in a foreign network, the serving network contacts the AuC (Authentication Center) located at the home network of the MS to authenticate it. To reduce this cost, AuC sends n AVs(Authentication Vectors) to the serving network. Although the use of AVs allows the serving network to authenticate an MS without contacting the AuC each time, there are also shortcomings such as synchronization problem. Subsequently, a set of protocols adopting the same or similar method have been proposed. In this paper, we analyze and compare authentication protocols for UMTS with respect to the use of AVs and its alternatives. We conclude that using Kerberos-like ticket key overcomes some of the drawbacks of using AVs, whereas AVs provide much better security.

• THE INTERNATIONAL COMMERCE & LAW REVIEW
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• v.57
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• pp.3-34
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• 2013

In the international sales contract, long-term contracts often face hardship in fulfilling the original contract terms by relevant parties due to rapid change and uncertainty of political and economic circumstance. In this case, party who faces hardship of fulfillment terminates contract or demands adaptation to contract condition but if opponent doesn't accept this, it proceeds to commercial dispute needing legal interpretation. Generally it is wise to set forth governing law in contract between parties in the case of international contract, for legal stability. One of universal governing law which relevant parties select by agreement to solve economical hardship of fulfillment is PICC. PICC defines the hardship in detail for renegotiation on following hardship of fulfillment unexpected. In the case of failing renegotiation, Court(arbitral tribunal) conducts termination to contract or adaptation to contract condition through arbitration or mediation. In conclusion, when signing international long-term contract, it is desirous to handle dispute effectively by inserting provisions which can deal with economical hardship in contract or defining PICC as governing law in the case of hardship incurred. It is because it is realistic to handle dispute smoothly to the extent that both parties can be satisfied in the case of hardship incurred, though international contract should be fulfilled.