33 Result(s)
within
** Seok Woo
Engineering
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Article
A modified low-pass filter with progressively diminishing ripples
A modified low-pass filter functions are proposed. A modified inverse Chebyshev function possesses progressively diminishing ripples in the stopband whereas the modified Chebyshev function exhibits ripples dim...
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Article
Simultaneous 3D machining with real-time NURBS interpolation
Increasing demand on precision machining using computerized numerical control (CNC) machines have necessitated that the tool move not only with the smallest possible position error but also with smoothly varyi...
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Article
Analysis of compression ignition combustion in a schnurle-type gasoline engine comparison of performance between direct injection and port injection systems-
A two-stroke Schnurle-type gasoline engine was modified to enable compression-ignition in both the port fuel injection and the in-cylinder direct injection. Using the engine, examinations of compression-igniti...
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Article
Application of ORP and pH as controlling factors in sequencing batch reactor
The ratio of aeration/non-aeration is a key variable in the operation of a Sequencing Batch Reactor (SBR) for biological nutrient removal (BNR). To determine the ratio of aeration/non-aeration, the Oxidation R...
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Article
Shrinkage ratio of PDMS and its alignment method for the wafer level process
In the research area known as Lab-on-a-Chip, poly-dimethylsiloane (PDMS) is a popular material whose fabrication method is the replication of patterns by curing on a mold. Shrinkage of PDMS occurs when it is c...
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Chapter
Model-Based Recognition of 3D Objects using Intersecting Lines
Exploiting geometric features, such as points, straight or curved lines and corners, plays an important role in object recognition. In this paper, we present a model-based recognition of 3D objects using inter...
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Article
Micro grooving simulation and optimization in the roughing stage
The micro pattern machining on the surface of a wide mold is not easily simulated and optimized using conventional methods. This paper represents the micro pattern cutting simulation software. The software sim...
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Article
Burr analysis in microgrooving
Microburr formation affects badly on product's quality, especially the finishing surface. Besides, deburring techniques on microcutting are almost impossible or high cost. Understanding burr formation phenomen...
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Article
A stitching algorithm for measuring large areas using scanning electron microscopes
SEM is very useful measuring equipment in the micro and nano area. In general, it is not used to accurately measure the size information of a sample, but to measure its shape characteristics. In addition, it h...
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Article
A theoretical deformation prediction of micro channels in ultra-precision machining
In ultra-precision machining for micro channels, deformation occurs with high frequency. A high aspect ratio, high cutting speed, high feed rate, etc. all lead to deformation. Several studies on the deformatio...
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Article
Effect of ultrasonic vibration in grinding; horn design and experiment
Ultrasonic vibration can be applied for grinding of difficult to cut materials, such as titanium, ceramics, etc., because the ultrasonic vibration in longitudinal direction can cause reduction of cutting tempe...
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Chapter and Conference Paper
An Approach to Detecting Human Nipple Regions Using Color Map
In this paper, we suggest a new method to detect female nipple areas, representing harmfulness of input images, by employing a color nipple map and geometrical features. The proposed method first detects human...
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Article
Cold-temperature deformation of nano-sized tungsten and niobium as revealed by in-situ nano-mechanical experiments
We constructed and developed an in-situ cryogenic nanomechanical system to study small-scale mechanical behavior of materials at low temperatures. Uniaxial compression of two body-centered-cubic (bcc) metals, Nb ...
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Article
Centrifuge modeling of differential settlement and levee stability due to staged construction of enlarged embankment
Many old levees along major rivers in South Korea have been reinforced by enlargement construction. Conventionally, the design settlement is simply estimated without considering variations in the material prop...
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Article
Eco-friendly face milling of titanium alloy
Recently, a use of difficult to cut materials including titanium alloy has been substantially increasing in aerospace and automotive industries. Eco-friendly machining technology, which eliminates or minimizes...
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Article
Emission characteristics of high-voltage plasma diode cathode for metal surface modification
Electron beam cathodes have been used in various fields such as microscopy, X-ray tubes, welding, and surface modification. Generally, cathodes use metals with lower work function, higher thermal resistance, l...
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Article
The effect of cryogenic cooling and minimum quantity lubrication on end milling of titanium alloy Ti-6Al-4V
The cooling down of cutting temperature in machining is very important for the improvement of tool life, especially when dealing with work materials that have low thermal conductivity such as titanium alloy. I...
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Article
Detection of Harmful Content Using Multilevel Verification in Visual Sensor Data
Various types of harmful content such as adult images and video clips have been increasingly distributed through wired or wireless visual sensor-based networks. In this paper, we propose a new algorithm for ex...
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Article
Milling of titanium alloy with cryogenic cooling and minimum quantity lubrication (MQL)
Titanium alloy is being widely used in various applications in aerospace, energy and biomedical industries mainly due to its superior material properties such as high strength even at high temperatures, lightw...
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Article
Control of a hybrid active-passive vibration isolation system
Precision vibration control is a major issue in nanotechnology. In particular, nano-precision measurement systems such as Atomic force microscopes (AFM) and Scanning probe microscopes (SPM) are sensitive to gr...
