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Korean Competition Statute Its Limits and Measures for Improvements
( Sung Eyup Park ) 서울대학교 아시아태평양법연구소 2005 Journal of Korean Law Vol.4 No.2
Over recent years, there have been numerous debates among various members from the Korean legal community in discussing whether the Monopoly Regulation and Fair Trade Act(“MRFTA”) currently effective in Korea, as it pertains to regulating the unfair trade practices of business enterprises (the “Competition Statute”), contains sufficient mechanisms to provide adequate remedies to injured parties in Competition Statute violation cases. Despite all efforts exerted by the Fair Trade Commission(“FTC”) in enforcing the Competition Statute, there seems to be an obvious limit as to what it can do, which appears to be caused by the following three main factors: (i) a general perception that governmental regulatory efforts should be contained; (ii) a general perception that corrective orders are overly intrusive; and (iii) cultural indifference in resorting to legal remedies. There are measures that may be taken to overcome such barriers which limit both the regulatory body and injured parties, which include such measures as introducing treble damage compensation, lowering the barrier of commencing a legal action, allowing injunctive orders, and introducing a Parens Patriae action or Consent Decree system. Over recent years, there have been numerous debates among various individuals from the Korean legal community in relation to the Monopoly Regulation and Fair Trade Act (“MRFTA”). Among the various issues that come up in such debates, one pertains to the effectiveness of a part of the MRFTA which is related to regulating the unfair trade practices of business enterprises (the “Competition Statute” or “Statute”). In particular, discussions arise in terms of whether the current Statute contains sufficient mechanisms to provide adequate remedies to injured parties in Competition Statute violation cases. In that regard, this article will review some of the issues that arise in such discussions. In doing so, this article has been divided into three main sections. The first section will illustrate the types of remedies the Statute currently affords to injured parties. Thereafter, the second section will provide a brief discussion on certain factors that limit the FTC’s efforts in providing appropriate remedies to injured parties. The last section will provide a discussion on potential measures that may be taken to improve the remedial measures in future cases.
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Ece Ayli,Eyup Kocak 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.9
A numerical study is undertaken to investigate the effect of twisted tape inserts on heat transfer. Twisted tapes with various aspect ratios and single, double, and triple inserts are placed inside a tube for Reynolds numbers ranging from 8000 to 12000. Numerical results show that the tube with a twisted tape and different numbers of tape is more effective than the smooth tube in terms of thermo-hydraulic performance. The highest heat transfer is achieved with the triple insert, with the highest turning number and an increment of 15 %. Then, an artificial neural network (ANN) model with a three-layer feedforward neural network is adopted to obtain the Nusselt number on the basis of four inputs for a heated tube with a twisted insert. Several configurations of the neural network are examined to optimize the number of neurons and to identify the most appropriate training algorithm. Finally, the best model is determined with one hidden layer and thirteen neurons in the layer. Bayesian regulation is chosen as the training algorithm. With the optimized algorithm, excellent precision for measuring the output is provided, with R2 = 0.97043. In addition, the optimized ANN architecture is applied to similar studies in the literature to predict the heat transfer performance of twisted tapes. The developed ANN architecture can predict the heat transfer enhancement performance of similar problems with R2 values higher than 0.93.
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Hakan Calis,Eyup Caki 대한전기학회 2014 Journal of Electrical Engineering & Technology Vol.9 No.6
Induction motors are widely used due to their rugged, robust and easy to care features. Since they are heavily used in industry, testing of three phase induction motors have play a vital role. In order to determine motor equivalent circuit parameters, efficiency of motor, squirrel caged laboratory sized an induction motor test setup is prepared. It is suitable for the induction motor with the frame size of 100 and 112. A virtual Instrumentation typed engineering workbench (called as LabVIEW) software packet, is utilized as a graphical user interface program. Motor input power is measured by measuring the input voltage, current and power factor with the help of hall effect typed voltage and current transformers. Also, the output power is measured by measuring the speed and torque with the help of an encoder and torque sensor. All outputs of the voltage and current transformer, encoder and temperature, torque sensors are given to the Data Acquisition Card (DAQ) which acquires the data for processing and then the equivalent circuit parameters, efficiency, performance and loading characteristics are found out, using LabVIEW based user interface. It is suggested to use this test rig for the quality control of produced motors in industry, and an educational experiment setup in the school laboratories.
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Supervised learning method for prediction of heat transfer characteristics of nanofluids
Ece Aylı,Eyup Kocak 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.5
This study focuses on the alication and investigation of the predictive ability of artificial intelligence in the numerical modelling of nanofluid flows. Numerical and experimental methods are powerful tools from an accuracy point of view, but they are also time- and costconsuming methods. Therefore, using soft-computing techniques can improve such CFD drawbacks by patterning the CFD data. After obtaining the aropriate ANN and ANFIS architecture using the CFD data, many new data can be created without requiring numerical and experimental methods. In the scope of this research, the FCM-ANFIS and ANN methods are used to predict the thermal behaviour of the turbulent flow in a heated pipe with several nanoparticles. A parametric CFD study is carried out for water-TiO 2 , water-CuO, and waterSiO 2 nanofluid through a pipe. The Reynolds number is varied between 7000 and 15000, and the nanofluid concentration is varied between 0.25 % and 4 %. The effects of using nanofluid on local values of Nusselt number and shear stress distribution were investigated. Numerical results indicate that with the increasing nanoparticle volume fraction of nanofluid, the average Nusselt number increases, but the required pumping power also increases. The obtained soft computing results demonstrate that the FCM clustering ANFIS has given better results both in training and testing when it is compared to the ANN architecture with an R 2 of 0.9983. Regarding this, the FCM-ANFIS is an excellent candidate for calculating the Nusselt number in heat transfer problems.
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Volkan Kovan,Gurkan Altan,Eyup Sabri Topal 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.5
Three-dimensional printing is the common name given to various techniques used to manufacture different objects. Fused deposition technique is a commonly used additive manufacturing technology in prototyping and production. Fused deposition modelling systems are limited in terms of shape and size of parts. Printing parts with less support material, for parts too large to print in a single operation or for parts with fine details, sectioning and adhesively bonding is the solution for manufacturing. According to adhesion theory, the strength of adhesively bonding between three-dimensional printed parts is affected by surface roughness. Effects of layer thickness and print orientation on adhesion strength of parts manufactured with three-dimensional printing were experimentally studied. As a result of the study, it was found that the edgewise orientation had the highest bonding strength in lower layer thicknesses, while flatwise orientation had the highest bonding strength in higher layer thicknesses.
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Calis, Hakan,Caki, Eyup The Korean Institute of Electrical Engineers 2014 Journal of Electrical Engineering & Technology Vol.9 No.6
Induction motors are widely used due to their rugged, robust and easy to care features. Since they are heavily used in industry, testing of three phase induction motors have play a vital role. In order to determine motor equivalent circuit parameters, efficiency of motor, squirrel caged laboratory sized an induction motor test setup is prepared. It is suitable for the induction motor with the frame size of 100 and 112. A virtual Instrumentation typed engineering workbench (called as LabVIEW) software packet, is utilized as a graphical user interface program. Motor input power is measured by measuring the input voltage, current and power factor with the help of hall effect typed voltage and current transformers. Also, the output power is measured by measuring the speed and torque with the help of an encoder and torque sensor. All outputs of the voltage and current transformer, encoder and temperature, torque sensors are given to the Data Acquisition Card (DAQ) which acquires the data for processing and then the equivalent circuit parameters, efficiency, performance and loading characteristics are found out, using LabVIEW based user interface. It is suggested to use this test rig for the quality control of produced motors in industry, and an educational experiment setup in the school laboratories.
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Channel current analysis of GaN HEMTs with source sense pin in DC/DC boost converters
Azizoglu, Buket Turan,Balikci, Abdul,Akpinar, Eyup,Durbaba, Enes The Korean Institute of Power Electronics 2021 JOURNAL OF POWER ELECTRONICS Vol.21 No.4
The breakdown strength and electron mobility of gallium nitride (GaN) are almost ten and three times higher than those of the silicon devices. Wide band-gap devices have a higher thermal conductivity, higher switching frequency capability, lower on-state resistance and lower power dissipation. Detailed analytical models in the electrical network and channel current variations of these devices during switching intervals are still under investigation. The energy loss and heat dissipation on a power converter can be precisely estimated if the operational modes and the corresponding mathematical models of the device are accurately obtained. Depending on the instantaneous values of the channel current and voltage drops on the components computed from the model, the power dissipation and thermal response can be examined. Prediction of the switching losses of a GaN high electron mobility transistor (HEMT) with a source sense pin can be performed using the instantaneous variation of channel current. In this paper, a detailed analytical model including the stray inductances and parasitic capacitors is derived to obtain the channel current of GaN HEMTs with a source sense pin. The turn-on and turn-off transient energy losses during the switching of a single GaN HEMT device can be computed from the analytical model proposed in this paper using the channel current and drain-source voltage. Results of the derived analytical model, SPICE simulations and experimental work on the DC/DC boost converter are compared.
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