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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korea Society For Power System Engineering
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Journal DOI :
The Korea Society for Power System Engineering
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Volume & Issues
Volume 19, Issue 6 - Dec 2015
Volume 19, Issue 5 - Oct 2015
Volume 19, Issue 4 - Aug 2015
Volume 19, Issue 3 - Jun 2015
Volume 19, Issue 2 - Apr 2015
Volume 19, Issue 1 - Feb 2015
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Structural Analysis of a Cavitary Region Created by Femtosecond Laser Process
Fujii, Takaaki ; Goya, Kenji ; Watanabe, Kazuhiro ;
Journal of the Korea Society For Power System Engineering, volume 19, issue 3, 2015, Pages 5~10
DOI : 10.9726/kspse.2015.19.3.005
Femtosecond laser machining has been applied for creating a sensor function in silica glass optical fibers. Femtosecond laser pulses make it possible to fabricate micro structures in processed regions of a very thin glass fiber line because femtosecond laser pulses can extremely minimize thermal effects. With the laser machining to optical fiber using a single shot of 210-fs laser at a wavelength of 800 nm, it was observed that a processed region surrounded a thin layer which seemed to be a hollow cavity monitored by scanning electron microscopy (SEM). This study aims at a theoretical investigation for the processed region by using a numerical analysis in order to embed sensing function to optical fibers. Numerical methods based finite element method (FEM) has been used for an optical waveguide modeling. This report suggests two types modeling and describes a comparative study on optical losses obtained by the experiment and the numerical analysis.
Multi-point detection of hydrogen using the hetero-core structured optical fiber hydrogen tip sensors and Pseudorandom Noise code correlation reflectometry
Hosoki, Ai ; Nishiyama, Michiko ; Igawa, Hirotaka ; Seki, Atsushi ; Watanabe, Kazuhiro ;
Journal of the Korea Society For Power System Engineering, volume 19, issue 3, 2015, Pages 11~15
DOI : 10.9726/kspse.2015.19.3.011
In this paper, the multi-point hydrogen detection system based on the combination of the hetero-core optical fiber SPR hydrogen tip sensor and interrogator by pseudorandom noise (PN) code correlation reflectometry has been developed. In a light intensity-based experiment with an LED operating at 850 nm, it has been presented that a transmitted loss change of 0.32dB was induced with a response time of 25 s for 4%
in the case of the 25-nm Au, 60-nm
, and 5-nm Pd multi-layers film. The proposed sensor characteristic shows excellent reproducibility in terms of loss level and time response for the in- and out-
action. In addition, in the experiment for multi-point hydrogen detection, all sensors show the real-time response for 4% hydrogen adding with reproducible working. As a result, the real-time multi-point hydrogen detection could be realized by means of the combination of interrogating system and hetero-core optical fiber SPR hydrogen tip sensors.
Reduction of Nitrous Oxide Emission by EGR Method on Diesel Engine
Yoo, Dong-Hoon ;
Journal of the Korea Society For Power System Engineering, volume 19, issue 3, 2015, Pages 16~21
DOI : 10.9726/kspse.2015.19.3.016
) concentration in the atmosphere has been constantly increased by the human activities with industrial growth after the industrial revolution. One of factors to increase
concentration in the atmosphere is the
emission caused by the combustion of marine fuel. Especially, a sulfur component included in marine fuel oils is known as increasing the
formation in diesel combustion. Form this point of view,
emission from a ship is not negligible. On the other hand, Exhaust gas recirculation(EGR) that have thermal, chemical and dilution effect is effective method for reducing the NOx emission. In this study, an author investigated
reduction by using EGR on a direct injection diesel engine. The test engine was a 4-stroke diesel engine with maximum output of 12 kW at 2600rpm, and operating condition of the engine was a fixed load of 75%. The experimental oil was a blend-fuel that were adjusted with sulfur ratio of 3.5%, and EGR ratio of 0%, 10%, 20% and 30%. In conclusion, diesel fuel that contained 3.5% sulfur component increased
emission in exhaust gas, and increment of EGR ratio reduced NO emission. Moreover,
emission was decreased as over 50% at EGR ratio of 10% and reduced 100% at EGR ratio of 30% compared with
emission of 0% EGR ratio.
Basic Study of Behavior Characteristics of Emulsified Fuel with Fuel Design
Yeom, Jeong-Kuk ;
Journal of the Korea Society For Power System Engineering, volume 19, issue 3, 2015, Pages 22~28
DOI : 10.9726/kspse.2015.19.3.022
A compression ignition type of diesel engine makes fuel efficiency better and
in the exhaust gas lower. Also it is suitable to apply alternative fuels(blended fuel) to the engine. The objective of this study is the emissions reduction of diesel engine with EF(Emulsified fuel). The emulsified fuel consists of diesel and peroxide(
) and Soot reduction without worsening of NOx emissions can be achieved by using thermal decomposition of the peroxide, i.e. the chemical effect of the OH radical in actual engine. For manufacturing emulsified fuel, a surfactant which is comprised of span 80 and tween 80 mixed as 9:1, was mixed with a fixed with 3% of the total volume in the emulsion fuel. In addition, considering the mixing ratio of the surfactant, the mixing ratio of
in the emulsified fuel was set as EF0, EF2, EF12, EF22, EF32, and EF42, respectively. Consequently, this study aims to obtain the optimization of fuel design(mixing) for the emulsified fuel applying to the diesel engine.
An Experimental Study on Combustion Characteristics of Biodiesel Fuel in Marine Diesel Engine
Cho, Sang-Gon ;
Journal of the Korea Society For Power System Engineering, volume 19, issue 3, 2015, Pages 29~35
DOI : 10.9726/kspse.2015.19.3.029
Environmental pollution is produced by consumption of fossil fuel, therefore alternative fuels is interested for development of new energy resources and reduction of exhaust emissions for air pollution prevention. Biofuels are produced from new vegetable oil and animal fat, may be used as fuel without change of engine structure in diesel engine. In this paper, the test results on specific fuel consumption, combustion characteristics of neat diesel oil and biodiesel blends(10 vol.% biodiesel and 20 vol.% biodiesel) were presented using four stroke, direct injection diesel engine, especially this biodiesel was produced from biodiesel fuel at our laboratory by ourselves. This study showed that specific fuel consumption is increased slightly, on the other hand cylinder pressure, rate of pressure rise, rate of heat release and soot were decreased slightly in the case of biodiesel blends than neat diesel oil.
Study on the Algorithm Characteristic of True North-Finding Utilizing 1-axis Gyro Sensor Equipment
Choi, Ju-Ho ; Kwon, Young ; Lee, Dae-Chul ; Chung, Han-Shik ; Jeong, Hyo-Min ;
Journal of the Korea Society For Power System Engineering, volume 19, issue 3, 2015, Pages 36~41
DOI : 10.9726/kspse.2015.19.3.036
The true north-finding equipment utilizing gyro sensor is used for INS(Inertial Navigation System) and has an increasing preference for gyro compass system due to compact size, lightening, low power and price. The purpose of this experiment is to research gyro compass system providing high performance in the field of manned or unmanned gyro compass system which proposes the accuracy of 1% utilizing experimented equipment at true north of the earth. Unlike the conventional system, the proposed gyro sensor system indicates to be applied in the various and specific equipment using multiple technique and method.
Design of a Servo Controller for Antilock Brake Systems Based on the Automotive Tire Model
Hwang, I-Cheol ;
Journal of the Korea Society For Power System Engineering, volume 19, issue 3, 2015, Pages 42~47
DOI : 10.9726/kspse.2015.19.3.042
This paper studies on the design of a servo controller for an antilock brake system(ABS) based on the car tire model. First, a nonlinear differential equation of the car tire is constructed and its linearization model is obtained by Taylor's series. Second, a servo controller based on the mathematical model is analytically designed to obtain the maximum brake force, where the tire velocity and the slip ratio of car tire are respectively controlled to the given command values. Third, it is theoretically shown that the proposed control algorithm has good usefulness in ABS.
A soldering station controller for two types heater
Oh, Kab-suk ;
Journal of the Korea Society For Power System Engineering, volume 19, issue 3, 2015, Pages 48~54
DOI : 10.9726/kspse.2015.19.3.048
This paper introduced a design method of soldering station that can control two types of soldering iron heater. At design time, to distinguish two types of soldering iron heater the voltage divider rule has been applied, and the distinguished resistor is inserted to handler of soldering iron to prevent misuse by users. And an algorithm to design a PID controllers is proposed. The proposed controllers parameter which can be easily realized, and are designed by using the input output data from systems, and have outstanding ability making the output response of nonlinear systems similar to the desired one. Temperature control experiments were performed to verify the ability of the suggested controller. As a result, suggested PID controller followed the desired ones, and one soldering station can control the various type of soldering irons in real time.
Zeroth-Order Shear Deformation Micro-Mechanical Model for Periodic Heterogeneous Beam-like Structures
Lee, Chang-Yong ;
Journal of the Korea Society For Power System Engineering, volume 19, issue 3, 2015, Pages 55~62
DOI : 10.9726/kspse.2015.19.3.055
This paper discusses a new model for investigating the micro-mechanical behavior of beam-like structures composed of various elastic moduli and complex geometries varying through the cross-sectional directions and also periodically-repeated along the axial directions. The original three-dimensional problem is first formulated in an unified and compact intrinsic form using the concept of decomposition of the rotation tensor. Taking advantage of two smallness of the cross-sectional dimension-to-length parameter and the micro-to-macro heterogeneity and performing homogenization along dimensional reduction simultaneously, the variational asymptotic method is used to rigorously construct an effective zeroth-order beam model, which is similar a generalized Timoshenko one (the first-order shear deformation model) capable of capturing the transverse shear deformations, but still carries out the zeroth-order approximation which can maximize simplicity and promote efficiency. Two examples available in literature are used to demonstrate the consistence and efficiency of this new model, especially for the structures, in which the effects of transverse shear deformations are significant.
Comparison of the Energy Load according to the Balcony Types and Blind Installation
Lee, Jun-Gi ; Lee, Gab-Taek ; Lee, Kyung-Hee ;
Journal of the Korea Society For Power System Engineering, volume 19, issue 3, 2015, Pages 63~68
DOI : 10.9726/kspse.2015.19.3.063
We reviewed annual energy consumption for lighting, cooling and heating in relation to different types of office buildings and locations of window shading devices. Modeling of non-extensible and extensible offices was conducted using the Design Builder program, and simulations were conducted with window shading devices installed in different location.
Solidification Analysis Characteristics of Back Flow Prevention Check Valve
Yoon, Jung-In ; Moon, Jung-Hyun ; Son, Chang-Hyo ; Lee, Jung-Jin ;
Journal of the Korea Society For Power System Engineering, volume 19, issue 3, 2015, Pages 69~74
DOI : 10.9726/kspse.2015.19.3.069
Check valves used in vessels include shock-release function on piping system, aside from basic back flow prevention. However, proper and enough protection of system is not obtainable due to use of high-pressure and bulk fluids, resulting from enlargement of vessels. In this study, casting analysis of check valves protecting systems in flow path from water hammering or back flow is conducted, using Z-CAST program. Also, molten metal filling, flow analysis, solidification analysis and shrinkage cavity analysis are conducted. The main results are as following. Regarding filling of each risering, molten metal showed stable supply condition without being isolated. It was identified that the final solidification exists on risering, but shrinkage cavity possibly might happens at the point of isolation solidification.
Redundancy resolution method of omni-directional mobile manipulator system
Kwon, Soon-Jae ; Jeong, Jae-Ung ;
Journal of the Korea Society For Power System Engineering, volume 19, issue 3, 2015, Pages 75~80
DOI : 10.9726/kspse.2015.19.3.075
Typically, robot system configured by articulated robot manipulator with 1 DOF transfer unit is being applied in automotive manufacturing automation process. Especially, 1 DOF transfer unit is necessary to extend workspace of robot manipulator. In this configuration, because transfer unit works only one direction, robot manipulator only works in one side in case of car body painting or sealing automation process. it is necessary three robot manipulator system at least. In this paper, in order to robot manipulator works effectively in car body sealing automation application, we are suggested omni-directional manipulator system and conducted studying on redundancy resolution method to solve manipulability-optimal problem.