• Journal of the Korea Academia-Industrial cooperation Society
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• v.7 no.4
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• pp.709-714
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• 2006

The propose of this study was to investigate the feasibility of using waste lime core to remove phosphorus from wastewater in continuous flow reaction. The phosphorus was found to be removed from municipal wastewater by hydroxyapatite crystallization and precipation. Waste lime core size 1, 2 showed phosphorus removal rate of about 90% during early 11 hrs of run time. In addition, breakpoint time was decreased by increased inflow rate regardless of waste lime core size.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.7 no.4
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• pp.684-689
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• 2006

Rainfall is the most basic input data to analyze the hydrologic system. When we measure the rainfall data, the rainfall data can be missing due to various reasons. Therefore, various interpolation methods are available for compensating the missing data. However, the interpolation methods were used without considering their applicability and accuracy. This study compares the interpolation methods such as the arithmetic mean method, normal ratio method, modified normal ratio method, inverse distance method, linear programming, Kriging method to estimate the existing rainfall correction method.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.3 no.4
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• pp.227-232
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• 2002

Electronic Travel Aids (ETA) developed for the blind such as sonicguide, mowat sensor and bionic C-5 laser cane have many problems like technical deficiency and high cost. Moreover, these systems have need for more training to perceive obstacle around. Therefore, In this study, we studied the blind's obstacle perception characteristics by human auditory sense, and development of ultrasonic ETA which have more simple usage, low cost and immediate usableness than present ETAs.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.3 no.4
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• pp.257-262
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• 2002

A design method of a power controller for controlling the temperature adopted in RTP (rapid thermal processing) which uses the phase control method is presented. The power controller is fabricated by using the design method presented in this paper and is tested. As the results, the range of average voltage from the variable output is 0∼198.06 V and the control resolution is 48.356 mV (12 bit) at the range of the input signal (0∼10 V).

• Journal of the Korea Academia-Industrial cooperation Society
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• v.3 no.4
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• pp.285-289
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• 2002

This study is object to flow analysis of ice cone die. The finite element model was developed to compute the flow, velocity and pressure for ice cone die. For flow analysis using result from FEM Code. This flow analysis results, many variables such as internal pressure, boundary condition, constraint condition and velocity condition are considered.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.3 no.4
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• pp.290-294
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• 2002

This study is object to semiconductor cavity block production technology using CAD/CAM. Semiconductor packaging is require to the high intensity, high temperature and good metals. That raw metals name is ASP23 and high price. This results are propose to one direction of semiconductor cavity block production technology.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.3 no.4
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• pp.303-307
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• 2002

A new product development procedure that uses a rapid prototyping and 3D CAD has been suggested. By applying this procedure to the development of an aroma diffuser, considerable amount of development time and cost were reduced. Moreover, by using 3D CAD from the early design stage, the number of trial and error can be reduced.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.1 no.2
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• pp.15-20
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• 2000

In this paper, hydraulic damper was studied to solve vibration problems of bridge, structures and several mechanic parts rising magnetic fluid. The damper was modeled using Magneto Rheological fluid and MR damper was manufactured on the basis of design drawing. To investigate the efficacy of magneto rheological phenomenon. experiments were performed on the several design parameters using Universal Testing Machine(UTM). Damping efficacy were examined by frequencies. displacement and electric currents through experiments.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.1 no.2
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• pp.63-68
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• 2000

A passively mode-locked ring type fiber laser had been installed in order to get the short pulses The single and the double mode-locking were appeared, and the shortest pulse length of 65 fs was obtained with a 110 m long dispersion shifted fiber(DSF) in a local cavity of 139.8 m. Also high order harmonic modelocking of 17th and Q-switched high order harmonic modelocking were obtained.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.3 no.4
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• pp.251-256
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• 2002

The average diffusion time of a polyacrylamide solution was determined by measuring the terminal velocities of the falling balls. The diffusion time increased as the polyacrylamide concentration increased. The PIV (Particle Image Velocimetry) system was employed to visualize the flow phenomena around balls. For a time interval of 30 seconds in the 2000 wppm, velocity vectors were larger than in case of 0 seconds, 40 seconds and 50 seconds in the falling ball. However, in the Newtonian fluid, flow vsualization around balls were performed at both upstream and downstream of the falling ball.