• Proceedings of the Korean Magnestics Society Conference
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• 2007.05a
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• pp.187.1-187.1
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• 2007

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2008.05a
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• pp.555-555
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• 2008

• Transactions of the Korean Society of Automotive Engineers
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• v.10 no.4
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• pp.158-165
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• 2002

This Paper deals with the headlamp lens surface temperature distribution of p/c headlamp using the three categories of H4 halogen bulbs. Glass is gradually replaced by P/C for the lens material off vehicle headlamp due to the weight reduction and stream lined body of a vehicle. With this trend, the newly established standards for a headlamp with a P/C lens in Europe requires that the heat generated by a bulb should not distort the lens surface. Also the requirements fur the bulb of a headlamp are being enforced in U.S.A & Europe. However, such requirements are not established yet in Korea. By using three kinds (60/55w, 100/90w, 130/90w) of H4 halogen bulbs in this experiment, the surface temperature distribution and Max. temperature on the lens were measured. The results of this study implies the necessity of requirement fur the bulb off headlamp.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2008.10a
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• pp.241-244
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• 2008

Automotive companies have conducted a study for light weigh body and crash safety. But It is difficult to adapt a mass production because of formability with high strength steel in the conventional stamping process. Recently, Automotive maker in the Europe, USA, Japan has applied a hot stamping with boron steel in the body structure. Hot stamping technology spread fast in various body parts of automobile. Bumper beam has been applied in the foreign automotive company so much nowadays. In this study, We will optimize crash performance of bumper beam using hot stamping through comparison with conventional bumper beam.

• Structural Engineering and Mechanics
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• v.53 no.4
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• pp.725-744
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• 2015

In this paper, a new damage indicator based on mode shape data is introduced to identify damage in beam structures. In order to construct the indicator proposed, the mode shape, mode shape slope and mode shape curvature of a beam before and after damage are utilized. Mode shape data of the beam are first obtained here using a finite element modeling and then the slope and curvature of mode shape are evaluated via the central finite difference method. In order to assess the robustness of the proposed indicator, two test examples including a simply supported beam and a two-span beam are considered. Numerical results demonstrate that using the proposed indicator, the location of single and multiple damage cases having different characteristics can be accurately determined. Moreover, the indicator shows a better performance when compared with a well-known indicator found in the literature.

• Korean Journal of Optics and Photonics
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• v.7 no.3
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• pp.200-206
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• 1996

When a Gaussian beam is incident to a planar dielectric interface at an angle other than Brewster angle or the critical angle of total reflection, we derive the six nonspecular effects of rotation, lateral shift, focal shift, Rayleigh length change, magnitude and phase changes in the complex amplitude of the reflected beam simultaneously by taking account of the boundary condition. In the derivation we assume a Gaussian beam of fundamental mode to emerge from the interface and then match at the interface the constant, linear, and quadratic variations of the amplitude and phase of the reflected beam with those of the incident beam multiplied by the reflection coefficient. Our calculation shows that the six nonspecular effects can result from a linear variation of the natural logarithm of the reflection coefficient at the interface.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2005.06a
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• pp.1531-1534
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• 2005

Nano pattern is being utilized to produce micro optical components, sensors, and information storage devices. In this study, a study on nano pattern fabrication using raster-scan type Focused Ion Beam (FIB) milling is introduced. Because the intensity of ion beam has Gaussian distribution, the overlapping of the Gaussian beam results in a 3D pattern, and the shape of the pattern can be adjusted by variation of FIB milling parameters, such as overlap, ion dose, and dwell time. The Gaussian shape of single beam intensity has been investigated by experiment, and 3D nano patterns with pitch of 200nm generated by FIB is demonstrated.

• Architectural research
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• v.16 no.2
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• pp.57-65
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• 2014

A study on the static analysis of Timoshenko beams is presented. A beam element is developed by using isogeometric approach based on Timoshenko beam theory which allows the transverse shear deformation. The identification of transverse shear locking is conducted by three refinement schemes such as h-, p- and k-refinement and compared to other reference solutions. From numerical examples, the present beam element does not produce any shear locking in very thin beam situations even with full Gauss integration rule. Finally, the benchmark tests described in this study is provided as future reference solutions for Timoshenko beam problems based on isogeometric approach.

• Journal of Korean Society of Steel Construction
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• v.15 no.4 s.65
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• pp.467-474
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• 2003

Composite action can be achieved by providing shear connectors between the steel top flange and concrete topping. Composite sections are stiffer than the sum of the individual stiffness of slab and beam. They can therefore carry heavier loads or similar loads with appreciably smaller deflection. They are also less prone to transient vibration. In this study, T-type Steel Composite beam (TSC-beam) was developed and tested. The test results of TSC beam were compared with the theoretical results based on composite actions.

• Computers and Concrete
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• v.8 no.1
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• pp.59-70
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• 2011

A theoretical model known as the modified rotating-angle softened-truss model (MRA-STM), which is a modification of Rotating-Angle Softened-Truss Model and Modified Compression Field Theory, is presented for the analysis of reinforced concrete membranes in shear. As an application, shear strength and behaviour of reinforced concrete exterior beam-column joints are analysed using the MRA-STM combining with the deep beam analogy. The joints are considered as RC panels and subjected to vertical and horizontal shear stresses from adjacent columns and beams. The strut and truss actions in a beam-column joint are represented by the effective transverse compression stresses and a softened concrete truss in the proposed model. The theoretical predictions of shear strength of reinforced concrete exterior beam-column joints from the proposed model show good agreement with the experimental results.