• Proceedings of the Korea Association of Crystal Growth Conference
• /
• 1997.10a
• /
• pp.181-186
• /
• 1997

석탄회의 재활용율을 높이고자 비가소성 원료인 석탄회를 첨가한 슬립 및 고형화 소지의 유동학적 고찰을 하였고, 이들을 이용하여 주입성형 후 소성한 시편의 물성들을 측정하였다. 석탄회가 50wt.%이상 대체된 슬립의 경우 해교 기구는 점토내 입자의 정전기적 반발력 보다는 석탄회에 포함된 cenosphere 입자표면의 물유리 흡착에 의한 steric stabilization에 의한 것으로 판단되었다. 응집된 슬립은 전형적인 thixotrophy 현상을 나타내는 반면 분산후 재응집된 슬립은 점도가 계속 증가하는 겔화현상을 나타내어 망목구조를 갖는 성형체를 제조할 수 있었다. 석탄회 대체율 50wt.%의 소성체에서 가장 우수한 물성치를 얻을 수 있었으며, 대체율 70wt.%까지의 주입성형이 가능하였다.

• Journal of the Ergonomics Society of Korea
• /
• v.10 no.2
• /
• pp.51-55
• /
• 1991

Since slipping has been identified as a major hazard, it is important to understand the mechanism of a slip. Many researches, based on biomechanical studies, had been attempted to do that. Thowever, the correlation between the mechanism of a slip and psychophysical behaviors of people had rarely been verified. For example, the existence of small slips in a forward direction, which do not normally perceived by human subjects, has been established by several experimenters. However, the term "microslips are not perceived by the walkers[4]." has not been examined precisely by any experiments. The objective of this study is, using a Signal Detection Theory (SDT), to define a microslip and slip more quqntitatively with the biomechanical measurement of slip distance. The results showed that, the slip distance around the 3 centimeters, there was a obvious change in the accident detectability of the subject. The conclusion is that it is possible to identify the boundary of a microslip and slip around the 3 centermeters of slip distance.

• Proceedings of the KIEE Conference
• /
• 2009.07a
• /
• pp.1165_1166
• /
• 2009

In recent years, energy prices have soared, which of course have increased costs for railway operators. Simultaneously, the energy market has considerably changed that in most developed countries, it is deregulated, giving railway operators an opportunity to define new ways of using energy. Efficient operation of the railway system is considered as an essential way to energy saving while an efficient management of power level helps to lower the reference subscribed power, giving access to better energy rates. It is studied on the relation between time and force for the energy efficient driving of train in railway when the train is braking according to several slips.

• Journal of the Korean Society for Precision Engineering
• /
• v.20 no.5
• /
• pp.171-179
• /
• 2003

An Amplitude Proportional Friction Damper (APFD) is considered in order to improve the characteristics of Coulomb friction damper. The frictional force is proportional to the amplitude in APFD system and the system is non-linear as is Coulomb damper system. A free vibration analysis on the 1-DOF system has made to demonstrate the characteristics of the APFD system. The results show that APFD system has similar damping characteristics to the viscous damper. Also, the solution for the response of a base-excited system with APFD is developed through the application of a Fourier series to represent the frictional force of APFD. It is assumed that no stick-slips occur during any portion of the steady-state oscillation.

• Journal of the Korean Professional Engineers Association
• /
• v.19 no.3
• /
• pp.23-30
• /
• 1986

This study summarizes the results of tests on 18 two-slab push out specimens. The main purpose of tile survey was to evaluate the capacity and behavior of stud shear connectors embedded in high strength normal concrete (F$\sub$c/=260～390kg/$\textrm{cm}^2$). The normal concrete was made with crushed stones and natural sand near the Han River. Two different diameters (ø19mm, ø16 mm) of stud shear connectors were used for push out specimens. The following conclusions were drawn from this study. 1) The shear strength of stud connectors embedded in high strength concrete (F$\sub$c/=260～390kg/$\textrm{cm}^2$) was influenced by tensile stress of the stud shear connectors. The following empirical function described the test results: q$\sub$u/=0.5A$\sub$s/√F$\sub$c/E$\sub$c/$\leq$0.7A$\sub$u/F$\sub$u/ 2) The maximum load in this study was reached at slips varying from 2.5～6mm.

• Journal of Biomedical Engineering Research
• /
• v.14 no.4
• /
• pp.355-364
• /
• 1993

Clinical laboratory order communication system was developed to run fast and effective laboratory tests at the Chungbuk National University Hospital. The present system incorporated with the main Hospital Management Information System accepts :aboratory orders, classifies them based on the predefined logical system, and outputs various practical informations for the user. These assist sample taking, sample management, and work plan organization. A special care was taken to the sample management by introducing the bar code system. The system was written in the INFOS hierarchical database and COBOL, and is currently in the practical use for both in - and out-ward patients. The present system enabled fast and effective data communication as well as reducing the time and man power indispensable when the manual slips are used for order communication.

• Journal of the Korean Society of Industry Convergence
• /
• v.23 no.3
• /
• pp.427-431
• /
• 2020

In this Study, as the structure of IT module for smart phone display becomes thin to catch up with slim product trend, the reliability of display module is on the rise as a issue for product design. Especially, almost part of cellular phone should undergo thermal dissipation test. thus many manufacturers have considered design guide line using CAE and simulation for more effective usage of limited resources on the market. This test simulates the case when cellular phone slips through user's fingers while he is talking on the phone. This paper studies a thermal simulation of display module in smart phone. This design for reliability improvements are suggested on the basis of the results of FVM Analysis and display of IT module and smart phone design.

• Journal of Yeungnam Medical Science
• /
• v.6 no.2
• /
• pp.127-132
• /
• 1989

The upshoot and downshoot in Duane's retraction syndrome is believed to be related to a leash effect from the lateral rectus muscle. When the eye is rotated into the adducted position, the lateral rectus muscle slips over the globe, producing the up-and downshoot on adduction. The splitting of the ends of the lateral rectus into a Y configuration prevents the rotation of the globe up or down by stabilizing the muscle's position on the eye. Three patients with Duane's retraction syndrome demonstrated abnormal vertical movement on adduction and underwent a Y-splitting on the lateral rectus. In all patients, marked decrease in the up-and downshoot is noted after surgery.

• Proceedings of the Computational Structural Engineering Institute Conference
• /
• 1996.10a
• /
• pp.221-229
• /
• 1996

An analytical method based on the nonlinear layered finite element method is used to simulate the load-deflection behavior of strengthened beam. Beams considered in this study are the ones strengthened either with external steel plate or Carbon Fiber Reinforced Plastic (CFRP) sheets bonded to the overlay soffit or with reinforcing rebars in the overlay. The theoretically obtained load-deflections and strains of the strengthened beam are compared to the corresponding experimental values. Comparing the approximate measures on the cumulative slips, efficiencies of the repairing techniques are evaluated. Parametric studies are, then, peformed using the developed model to investigate the effects of design variables on the overal flexural behavior of the strengthened beam. Simply supported beams under monotonically increasing symmetrical loads are considered exclusively.

• Journal of the Korean Ceramic Society
• /
• v.14 no.2
• /
• pp.95-103
• /
• 1977

Characteristics of Ham Pyong clay and clay-organic complexes were investigated by means of geological exploration, chemical analysis, X-ray diffraction, differential thermal analysis, electron microscopy, thermal mechanical analysis, cation exchange capacity and viscosity measurement. The results are as follows; 1) This caly is a transported clay which has black and white colors, and the amounts of deposit are estimated about 1, 600, 000M/T. 2) The major mineral phases identified by X-ray diffraction are kaolinite, sericite and halloysite and the minor phases are quartz and feldspar, these mineral phases can be seperated very easily by the elutriation method. 3) It was supposed that the black colored clay involved a certain clay-organic complexs by the mechanism of intercalation as well as surface absorption. 4) The clay-organic complexes in clay seemed to improve dispersity, to increase the fluidity of clay-water slips, to decrease the firing shrinkage and to promote the thermo-chemical reaction at temperature range up to 50$0^{\circ}C$, but not to effect on the resulted firing color.