• Proceedings of the KIEE Conference
• /
• 2000.07a
• /
• pp.271-273
• /
• 2000

A magnetic field generator for small animal study was designed and constructed. For calculation of magnetic fields inside the cage, a three-dimensional calculation program was made. Using this, optimum electric current ratio and position of each coil were determined. Meanwhile, inductance of the generator was calculated for design of power supply. The field measurement results of the manufactured generator showed that the difference between maximum and minimum magnetic field at the living floor was less than 2%.

• The Transactions of the Korean Institute of Electrical Engineers C
• /
• v.51 no.2
• /
• pp.80-84
• /
• 2002

This paper presents some of the results of current research on 400kN Suspension Insulator Design. In this paper, authors carried out 2-dimensional field calculation in order to analyse dielectric characteristics of the insulator unit and 3-dimensional field calculation in order to analyse dielectric characteristics of the insulator strings. And the results of puncture tests of insulators were compared with the required field intensity of the insulator As results, it was found that electric field on the insulator unit is severest between two triple junctions, dielectric characteristics of insulator strings are much influenced by the surrounding configuration and the manufactured insulators have good results of puncture tests.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
• /
• v.22 no.10
• /
• pp.1016-1019
• /
• 2011

In this paper, we predict a maximum electric field strength of WCDMA base station using a pilot channel in a code domain. In order to verify the feasibility of our method, we compare our predicted value on a self-designed test base station with a general electric field strength measurement value at a full-traffic load condition and with a calculated value by a ray-tracing technique. Predicted results show above 90 % agreement with the general measurement and calculation values. We also show that our prediction method can be applied to electric field measurement on a real operating base station. Therefore, it is concluded that our prediction method be an effective method to measure a maximum electric field strength in a base station inspection test.

• Journal of the Korean Vacuum Society
• /
• v.17 no.5
• /
• pp.419-425
• /
• 2008

In previous study, it was reported that the anomalous skin effect should be considered in the low pressure condition(<10 mTorr). However there is the problem that the filament type antenna model of which size is 0 makes the non-physical phenomena that the electric field at the antenna point is infinite. Therefore, in this work, using the surface current model the electric field in antenna region is calculated and compared with the case of filament type antenna model in various conditions.

• Transactions of the Korean Society of Mechanical Engineers A
• /
• v.22 no.4
• /
• pp.715-722
• /
• 1998

A large electric system of a vacuum circuit breaker(VCB) has been studied for the electro-thermal analysis by finite element methods. Since the heat generation in VCB causes not only energy loss but deterioration of the VCB system with oxidization of parts, the overheating of the system must be prevented. For the analysis, a finite element formulation is derived for both electric analysis and thermal analysis that are coupled together. Two sets of formulations are uncoupled after finite dimensional approximation. First, the electric potential is obtained for the entire field and scaled to the given electric current. The electric field obtained is then used to calculate the heat generation in the VCB system including contacts and connections for the calculation of the temperature distribution in the entire domain. The finite element analysis is carried out to study the effect of shapes and locations of contacts and connections. From the results, the existing VCB has been modified to enhance its capacity with reduction of heat generation and temperature elevation.

• Journal of Magnetics
• /
• v.20 no.4
• /
• pp.450-459
• /
• 2015

In this paper, the safety distances and maximum permissible power (MPP) of resonant wireless power transfer systems are defined and derived with regard to human exposure to electromagnetic field (EMF). The definition is based on the calculated induced current density and electric field in the standard human model located between the transmitting and receiving coil. In order to avoid the adverse health effects such as stimulation of nerve tissues, the induced current and electric field must not exceed the basic restriction values specified in EMF safety guidelines. The different combinations of diameters of the coils and the distance between the two coils are investigated and their effects are analyzed. Two versions of EMF safety guidelines (ICNIRP 1998 and ICNIRP 2010) are used as bases for safety distance calculation and the difference between the two guidelines are discussed.

• Proceedings of the KIEE Conference
• /
• 1990.07a
• /
• pp.289-292
• /
• 1990

This study is to develope a spacer having almost uniform field distribution along the profile by controlling the high electric field in tensification at earthed part, especially triple junction in the spacer-electrode-gas boundary interface. Based on the extensive field calculation using CSM, a model spacer has been manufactured and tested. The test results show that the breakdown strength of the spacer is almost same as that of SF6 gas itself without spacer.

• Journal of Electrical Engineering and Technology
• /
• v.7 no.3
• /
• pp.406-410
• /
• 2012

This paper looks into the field inside the wide rectangular box structure that is excited by the High Power Electromagnetic(HPEM) source as a potential threat to electric grid and communication networks causing malfunction or destruction. The rectangular box is assumed power/ground planes and its internal field is calculated by the cavity model with the lightning strike excitation as an HPEM pulse. The accuracy of the calculation method employed here is validated through a $156mm{\times}106mm{\times}508{\mu}m$ parallel metallic plate case which is manufactured and tested, and is applied to the size of a building. With the help of the cavity model that takes into account loading, the level of the electric field is shown to decrease when a metal pillar is loaded between the power and ground planes.

• Proceedings of the KIEE Conference
• /
• 2007.07a
• /
• pp.1510-1511
• /
• 2007

In this study quantifying techniques of ELF magnetic fields arising from currunt carrying indoor-conductor are proposed. These techniques can be applied to line-conductor with finite length and any configuration. Since each component of magnetic field in rectangular axes system is seperated, the resultant magnetic field can be caculated for multi-conductor system through these techniques.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.35 no.7A
• /
• pp.725-730
• /
• 2010

Preparing the conversion to the digital broadcasting system, we are deciding broadcasting network plan and interference protection area, using the measured receiving electric field level from the digital broadcasting station. However, the essential researches are needed about a receiving electric field level, because a digital TV (DTV) broadcasting receiver has been improved and an actual receiving environment should be considered. In this paper, the measured data were classified with domestic terrain of line of sight (LOS) and those of non-LOS, and effective receiving electric field level was proposed based on the LOS data. It is known that receiving electric field-level of 48 ㏈uV/m or more should be required for receiving rate of 90% and 50 ㏈uV/m for that of 95%, on the basis of the information of domestic terrain LOS.