• The Journal of the Korea Contents Association
• /
• v.8 no.4
• /
• pp.273-284
• /
• 2008

Movements are a critical ability to young children's whole development, including physical, social/emotional, and cognitive development. This paper proposes the method to estimate movements suitable for young children's body conditions. The proposed method extracts a silhouette in each frame of videos that are obtained by deploying two video cameras by compensating illuminations, removing background and conducting morphology operations. And we extract silhouette feature values: an area, the ratio of length to width, the lowest foot position, and 7 Hu moments. Also, the area and movements of sub-area are used as local features. For motion estimation, we used probability propagation of the features extracted from the front and side frames. The proposed estimation algorithm is demonstrated for seven movements, walking, jumping, hopping, bending, stretching, balancing, and turning.

• Journal of the Institute of Electronics Engineers of Korea SC
• /
• v.41 no.4
• /
• pp.45-54
• /
• 2004

In this paper, a view point tracking system has been realized for outdoor augmented reality including broad area monitoring. Since the surroundings of the moving view point are changing, it is necessary to track the position and observation moment of the view point system for consistency between real and virtual images. For this reason, the GPS(Global Positioning System) is applied to the realized system for tracking the information on position and direction of the moving system. In addition, an optical position tracking system that is able to track view point in a limited area is used, because the local tracking system has to trace the image variation, seen to the observer in a moving vehicle, at a particular position and time. It was found that the realized outdoor augmented reality system, which combined the virtual information tracked in real time with the real image, can be very practical in various application area.

• Journal of the Computational Structural Engineering Institute of Korea
• /
• v.30 no.1
• /
• pp.23-30
• /
• 2017

Since shape, size and distribution of particles in particulate composites have spreaded characteristics, properties of particulate composites have variation and also system behavior using particulate composites have variation. However, it is difficult to consider spreaded characteristic of particles so that a system behavior is analysed using homogeneous techniques or using microstructure in local areas. In this study, for considering random variation of particles, RMDFs(random morphology description functions) are used to generate random microstructure and relationship between the number of gaussian functions and spreaded characteristic of particles was analysed using the geometrical moment of area. Also, multi-scale analysis was carried out for cantilever beam with full-random microstructure to study behavior of particulate composites structure. As a result, it is defined that spreaded characteristic of particles and the variation of deflections of cantilever beam are decreased as the number of Gaussian functions(N) is increased and converges at N=200.

• Journal of the Korean Magnetics Society
• /
• v.25 no.2
• /
• pp.31-38
• /
• 2015

Recently, a first-principles study led to a prediction that quaternary Heusler compounds, CoFeCrZ (Z = Ga, Ge) are excellent half-metallic ferromagnets. In this study, we investigate the electronic and the magnetic properties at the (001) surfaces of CoFeCrGa and CoFeCrGe by means of the full-potential linearized augmented plane wave (FLAPW) method within generalized gradient approximation. We considered two types of surface termination: CoFe-terminated and CrZ-terminated surfaces, Z being either Ga or Ge. From the calculated total magnetic moments and the local density of states, we found that half-metallicity is not preserved for all the surfaces. But the calculated atomic density of states showed that CrGa-terminated surface of the CoFeCrGa is almost half-metallic. The magnetic moment of the Co, Fe, or Cr atoms at the surface or subsurface layers in each system had very different values.

• The Journal of Art Theory & Practice
• /
• no.7
• /
• pp.89-123
• /
• 2009

The Philippines was colonized by Spain for about centuries, from 1521 to 1898, and ruled by America for around four decades, from 1899 to 1946. After recovering from the Second World War, the government started to harness human labor as export itself. In the present time the overseas Filipinos keep the economy afloat with their steady transfer of money to relatives and dependents. Through the art works, the issue which Filipinos were exploited and exported by its government has been reflected as the various allegories. As Filipinos traditionally follow and keep Catholic belief, themes of Christ's sacrifice has allegorically been represented as salvation, struggle, suppression, and emancipation of people. Through the allegory, we can interpret both the intrinsic and superficial texts. Also we can identity certain modes of the visuality of allegory in selected works from Philippine art history that in their complex mediations materialize the people and dignity of their predicament and their prevailing. Philippine art can be divided as three different features: passion, vagrancy, and mass formation. The passion stage was depicted as deep structure of Christian thought and devotional feeling, harsh capitalist system. In the pictures of vagrancy, under the regime of Ferdinand Marcos, the themes of drift, deprivation, and homelessness are reckoned through the images of pictures. The stories represented with allegory have been played an important role to bring local issues up as national ones. Those stages take us to the processes of mass formation or the depiction of the people as a moment in the totality of force. The allegorical sign refers to another sign that precedes it, but with which it will never able to coincide reach back to a previous stage and in this constant attempt at return incorporates a structural distance from its origin. The true people's art is one that radically generates transformative technologies and techniques so that it irrevocably breaks the plane of "art". In the painting, the truth is represented by functioning as foundation of a rhetoric of the image. And at this axis, the passional, the vagrant, and the mass formation tend to come together because they render the form of contingency that must be suffered and hopefully surpassed, a Filipino subjectivity that must be stitched in time.

• Journal of Korean Society of Steel Construction
• /
• v.9 no.4 s.33
• /
• pp.557-578
• /
• 1997

The objective of the study in this paper was to develop a beam-column element to model members with purely flexural yielding, as well as members with yielding under combined flexure and axial force during severe earthquake ground motins. The developed element can be considered as an one-component series hinge type model. It has the capability to model plastic axial deformation and changes in axial stiffness, and employs hardening rules to handle monotonic, cyclic or arbitrary loading. In general, when compared to experimental results and fiber model predictions, the element showed significantly better performance than the bilinear hinger model and could properly model the beam-column behavior of bare steel members in moment resisting frames. The developed element can more accurately predict local deformation demands and overall responses of structural systems under earthquake loadings than the bilinear hinge element.

• Journal of Korean Society of Steel Construction
• /
• v.21 no.3
• /
• pp.257-266
• /
• 2009

The results of the analysis of the structural behavior of diagrid nodes that were subjected to cyclic loads such as wind and earthquakes was not fully understood due to difficulties in considering the welding type. In this study, diagrid nodes were tested to determine their behavior when they are subjected to seismic or wind loads. Five specimens were designed and fabricated. The corresponding test parameters were the welding type for each point and the length of the overlap of the side stiffener and the brace web. Tensile force was applied to one diagrid brace member, and compression force was applied to the other diagrid brace member. Cyclic loading was applied until the failure. The test showed that failures are due to axial stress from axial force and the additional bending moment of the two combined axial forces that have different directions. Tensile failure was observed from the tensile force, and local buckling was observed from the compressive force at the flange of the brace member. In addition, the welding type and the length overlap affected the initial stiffness, the yielding stress, and the energy absorption of the diagrid node.

• Journal of Korean Society of Steel Construction
• /
• v.12 no.4 s.47
• /
• pp.351-362
• /
• 2000

This paper is to study on the behavior of CFT column to H-beam end plate connections with penetrated high-strength bolts under cyclic load. The main parameters are as follows: 1) the thickness of end plate: 16mm, 22mm and 25mm, 2) the thickness of column : 9mm and 12mm. Comparison and analysis on the test results are performed in accordance with parameters. This study investigates energy absorption capacity of beam-column connections and analyzes the shear strength of joint panel. The shear strength of joint panel is estimated by superimposing the strength of the steel which is based on the von Mises yield criterion and that of the concrete which is used the Strut model to consider the effect of filled concrete.

• Journal of Korean Society of Steel Construction
• /
• v.10 no.2 s.35
• /
• pp.211-219
• /
• 1998

The objective of this study is to investigate the structural behavior of Concrete-Filled Tubular Column H-Beam End-Plate Connections with Penetrated HT-Bolts under monotonic load. Simple bending tests are carried out with 5 kinds of specimens including beam specimen. The parameters of these tests are the thickness (T=22, 26. 30mm) of End-plates and the diameter (M=20, 22mm) of bolts. From the tests, the increasing values of yielding strength and initial stiffness of each specimen were gained as the thickness of End-plates and diameter of bolts are increasing. And the application of Bjorhovde et al and Eurocode 3 classification method by non-dimensional moment-rotation curves to the connections showed that all of them are included in rigid region as far as initial stiffness is concerned and all of them are also rigid as far as ultimate strength.

• Journal of Korean Society of Steel Construction
• /
• v.21 no.6
• /
• pp.619-626
• /
• 2009

The use of thin-walled flexural members has proven to be a practical way to achieve the lowest cost in the construction of prefabricated long-span, low-rise building frames in steel. On the other hand, most of these structures are subjected to corrosion due to environmental exposure, which can reduce their carrying capacity. Corrosion damage is a serious problem for these structures as it causes thickness loss. That is, the class of a section (plastic, compact, non-compact, or slender) may change from one to another due to the loss of thickness of the compression flange and web due to corrosion. In this study, the effects of corrosion on thin-walled members in long-span steel frames were evaluated with regard to the moment-rotation curve, initial stiffness, maximum load capacity, stiffness in the post-maximum capacity, and energy absorption.