Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of electromagnetic engineering and science
Journal Basic Information
Journal DOI :
The Korean Institute of Electromagnetic Engineering and Science
Editor in Chief :
Volume & Issues
Volume 15, Issue 4 - Oct 2015
Volume 15, Issue 3 - Jul 2015
Volume 15, Issue 2 - Apr 2015
Volume 15, Issue 1 - Jan 2015
Selecting the target year
Effects of 60-Hz Magnetic Fields on DNA Damage Responses in HT22 Mouse Hippocampal Cell Lines
Mun, Gil-Im ; Lee, Seungwoo ; Kim, Nam ; Lee, Yun-Sil ;
Journal of electromagnetic engineering and science, volume 15, issue 3, 2015, Pages 123~128
DOI : 10.5515/JKIEES.2015.15.3.123
Previously, we investigated extremely low-frequency magnetic fields (ELF-MFs) on diverse DNA damage responses, such as phosphorylated H2AX (
), comet tail moments, and aneuploidy production in several non-tumorigenic epithelial or fibroblast cell lines. However, the effect of ELF-MF on DNA damage responses in neuronal cells may not be well evaluated. Here, we investigated the effects of ELF-MF on the DNA damage responses in HT22 non-tumorigenic mouse neuronal cells. Exposure to a 60-Hz, 2 mT ELF-MF did not produce any increased
expression, comet tail moments, or aneuploidy formation. However, 2 mT ELF-MF transiently increased the cell number. From the results, ELF-MF could affect the DNA damage responses differently, depending on the cell lines.
Dosimetry for Resonance-Based Wireless Power Transfer Charging of Electric Vehicles
Park, Sang-Wook ;
Journal of electromagnetic engineering and science, volume 15, issue 3, 2015, Pages 129~133
DOI : 10.5515/JKIEES.2015.15.3.129
This paper presents the dosimetry of a resonance-based wireless power transfer (RBWPT) system for electric vehicles applications. The compact RBWPT system is designed to transfer power at 150-mm distance. The electric and magnetic fields generated by the RBWPT system and the specific absorption rate in the human body model, which stands around the system, are calculated. These analyses are conducted in two cases: the alignment and the misalignment between the transmitter and the receiver. The matching loops are adjusted to maximize the power transfer efficiency of the RBWPT system for the misalignment condition. When the two cases were compared for the best power transfer efficiency, the specific absorption rates (SAR) in the misalignment case were larger than those in the alignment case. The dosimetric results are discussed in relation to the international safety guidelines.
Effects of 60-Hz Time-Varying Electric Fields on DNA Damage and Cell Viability Support Negligible Genotoxicity of the Electric Fields
Yoon, Yeo Jun ; Li, Gen ; Kim, Gyoo Cheon ; Lee, Hae June ; Song, Kiwon ;
Journal of electromagnetic engineering and science, volume 15, issue 3, 2015, Pages 134~141
DOI : 10.5515/JKIEES.2015.15.3.134
The effect of a 60 Hz time-varying electric field was studied using a facing-electrode device (FED) and a coplanar-electrode device (CED) for further investigation of the genotoxicity of 60 Hz time-varying magnetic field (MF) from preceding research. Neither a single 30-minute exposure to the CED or to the FED had any obvious biological effects such as DNA double strand break (DSB) and apoptosis in cancerous SCC25, and HeLa cells, normal primary fibroblast IMR90 cells, while exposures of 60 Hz time-varying MF led to DNA damage with induced electric fields much smaller than those used in this experiment. Nor did repetitive exposures of three days or a continuous exposure of up to 144 hours with the CED induce any DNA damage or apoptosis in either HeLa or IMR90 cells. These results imply that the solitary electric field produced by time-varying MF is not a major cause of DSBs or apoptosis in cancer or normal cells.
Endonuclease G is Upregulated and Required in Testicular Germ Cell Apoptosis after Exposure to 60 Hz at 200 μT
Park, Sungman ; Kim, Min-Woo ; Kim, Ji-Hoon ; Lee, Yena ; Kim, Min Soo ; Lee, Yong-Jun ; Kim, Young-Jin ; Kim, Hee-Sung ; Kim, Yoon-Won ;
Journal of electromagnetic engineering and science, volume 15, issue 3, 2015, Pages 142~150
DOI : 10.5515/JKIEES.2015.15.3.142
Several reports supported that continuous exposure to 60 Hz magnetic field (MF) induces testicular germ cell apoptosis in vivo. We recently evaluated duration- and dose-dependent effects of continuous exposure to a 60 Hz MF on the testes in mice. BALB/c male mice were exposed to a 60 Hz MF at
for 24 hours a day for 2, 4, 6, or 8 weeks, and at 2, 20 or
for 24 hours a day for 8 weeks. To induce the apoptosis of testicular germ cell in mice, the minimum dose is
at continuous exposure to a 60 Hz MF for 8 weeks, and the minimum duration is 6 weeks at continuous exposure of
. Continuous exposure to a 60 Hz MF might affect duration- and dose-dependent biological processes including apoptotic cell death and spermatogenesis in the male reproductive system of mice. The safety guideline of the International Commission on Non-Ionizing Radiation Protection (ICNIRP) indicates that the permissible maximum magnetic flux density for general public exposure is
at 60 Hz EMF (ICNIRP Guidelines, 2010). In the present study, we aimed to examine the expression of pro- and anti-apoptotic genes regulated by the continuous exposure to 60 Hz at
in Sprague-Dawley rats for 20 weeks. The continuous exposure to 60 Hz at
does not affect the body and testicular weight in rats. However, exposure to 60 Hz MF significantly affects testicular germ cell apoptosis and sperm count. Further, the apoptosis-related gene was scrutinized after exposure to 60 Hz at
for 20 weeks. We found that the message level of endonuclease G (EndoG) was greatly increased following the exposure to 60 Hz at
compared with sham control. These data suggested that 60 Hz magnetic field induced testicular germ cell apoptosis through mitochondrial protein Endo G.
The Effect of Sub-chronic Whole-Body Exposure to a 1,950 MHz Electromagnetic Field on the Hippocampus in the Mouse Brain
Son, Yeonghoon ; Jeong, Ye Ji ; Kwon, Jong Hwa ; Choi, Hyung-Do ; Pack, Jeong-Ki ; Kim, Nam ; Lee, Yun-Sil ; Lee, Hae-June ;
Journal of electromagnetic engineering and science, volume 15, issue 3, 2015, Pages 151~157
DOI : 10.5515/JKIEES.2015.15.3.151
The increasing use of mobile phones has raised public concern about the possible biological effects of radiofrequency electromagnetic field (RF-EMF) exposure on the human brain. To investigate the potential effect of RF-EMF exposure on the brain, we examined the behaviors and hippocampal morphology of C57BL/6 mice after sub-chronic exposure to RF-EMFs with a relatively high SAR level (5.0 W/kg). We applied a 2-hour daily exposure of WCDMA 1,950 MHz using a reverberation chamber that was designed for whole-body exposure for 60 days. In the behavioral tests, RF-EMF did not alter the physical activity or long-term memory of mice. Moreover, no alteration was found in the neuronal and glial cells in the hippocampus by RF-EMFs. In this study, we showed that sub-chronic whole body RF exposure did not produce memory impairment and hippocampal morphological alteration in C57BL/6 mice.
A Prototype System for Early-Stage Breast Cancer Detection
Yi, Guk-Jin ; Kang, Woo-Geun ; Kim, Hyuk-Je ; Jeon, Soon-Ik ; Pack, Jeong-Ki ;
Journal of electromagnetic engineering and science, volume 15, issue 3, 2015, Pages 158~166
DOI : 10.5515/JKIEES.2015.15.3.158
The early detection of breast cancer is very important. The final goal of this study is to develop an inexpensive portable device for simply detecting the existence of breast cancer using microwaves. In this study, we proposed a detection algorithm and the system configuration of such a device. The feasibility of the proposed method was investigated by numerical simulation and actual measurement. A prototype sensing module was fabricated, and the measurement results for tumor phantoms were presented. The measurement results showed that the prototype sensing module worked well, and the simulation results revealed that the detection rate of the device could be about 60% for a 4 mm tumor and almost 100% for a 6 mm tumor. The proposed device can be used for the self-diagnosis of breast cancer. Further study is required to reduce the size of the sensing module.
Children's Mobile Phone Use and Dosimetry
Lee, Ae-Kyoung ; Kwon, Jong-Hwa ;
Journal of electromagnetic engineering and science, volume 15, issue 3, 2015, Pages 167~172
DOI : 10.5515/JKIEES.2015.15.3.167
Research results on possible effects caused by radiofrequency fields in children are limited because most of the studies published so far have focused on adults, rather than children. Mobile phone use is now widespread, even among younger children. If a biological risk due to mobile phone exposure is found, it might be greater in children because their bodies might be more sensitive to radiofrequency energy. The issue of a possible difference in sensitivity between adults and children begins with whether any difference exists physically in terms of electromagnetic absorption. This paper presents a review of recent publications on dosimetric comparisons between children and adults with respect to radiation from mobile phones. The issue of the health effects of mobile phone use is beyond the scope of the present review. Most of the dosimetry research on possible differences in power absorption between children and adults has been based on numerical modeling and analysis. The understanding of the results so far is presented and needed studies are described.
Effects of 915 MHz Radiofrequency Identification Electromagnetic Field Exposure on Neuronal Precursor Cells in the Dentate Gyrus of Adult Rat Brains
Kim, Hye Sun ; Lee, Yu Hee ; Lee, Yun-Sil ; Choi, Hyung-Do ; Kwon, Jong Hwa ; Pack, Jeong-Ki ; Kim, Nam ; Ahn, Young Hwan ;
Journal of electromagnetic engineering and science, volume 15, issue 3, 2015, Pages 173~180
DOI : 10.5515/JKIEES.2015.15.3.173
To explore the effects of radiofrequency electromagnetic field on the fate of neuronal cells, we investigated whether exposure to 915 MHz radiofrequency identification (RFID) caused morphological changes in neuronal cells in rat hippocampal dentate gyrus (DG). A reverberation chamber was used as a whole-body RFID exposure system. Rats were assigned to two groups: sham- and RFID-exposed groups. Rats in the RFID-exposed group were exposed to RFID at 4 W/kg specific absorption rate (SAR) for 8 hours daily, 5 days per week, for 2 weeks. Morphological evaluation of DG was performed using immunohistochemistry with doublecortin (DCX) as a neuronal precursor cell marker and neuronal nuclei (NeuN) as a mature neuronal cell marker. No significant morphological changes in DCX+ or NeuN+ cells in the DG of RFID-exposed rats were observed. These results suggest that RFID exposure induces no significant change in DCX+ neuronal precursor or NeuN+ neuronal cells in DG of rats.
Automatic RF Input Power Level Control Methodology for SAR Measurement Validation
Kim, Ki-Hwea ; Choi, Dong-Geun ; Gimm, Yoon-Myoung ;
Journal of electromagnetic engineering and science, volume 15, issue 3, 2015, Pages 181~184
DOI : 10.5515/JKIEES.2015.15.3.181
Evaluation of radiating radiofrequency fields from hand-held and body-mounted wireless communication devices to human bodies are conducted by measuring the specific absorption rate (SAR). The uncertainty of system validation and probe calibration in SAR measurement depend on the variation of RF power used for the validation and calibration. RF input power for system validation or probe calibration is controlled manually during the test process of the existing systems in the laboratories. Consequently, a long time is required to reach the stable power needed for testing that will cause less uncertainty. The standard uncertainty due to this power drift is typically 2.89%, which can be obtained by applying IEC 62209 in a normal operating condition. The principle of the Automatic Input Power Level Control System (AIPLC), which controls the equipment by a program that maintains a stable input power level, is suggested in this paper. The power drift is reduced to less than
by AIPLC, which reduces the standard uncertainty of power drift to 0.67%.
Hybrid MIMO Antenna Using Interconnection Tie for Eight-Band Mobile Handsets
Lee, Wonhee ; Park, Mingil ; Son, Taeho ;
Journal of electromagnetic engineering and science, volume 15, issue 3, 2015, Pages 185~193
DOI : 10.5515/JKIEES.2015.15.3.185
In this paper, a hybrid multiple input multiple output (MIMO) antenna for eight-band mobile handsets is designed and implemented. For the MIMO antenna, two hybrid antennas are laid symmetrically and connected by an interconnection tie, thereby enabling complementary operation. The tie affects both the impedance and radiation characteristics of each antenna. Further, printed circuit board (PCB) embedded type is applied to the antenna design. To verify the results of this study, we designed eight bands-LTE class 12, 13, and 14, CDMA, GSM900, DCS1800, PCS, and WCDMA-and implemented them on a bare board the same size as the real board of a handset. The voltage standing wave ratio (VSWR) is within 3:1 over the entire design band. Antenna isolation is less than -15 dB at the lower band, and -12 dB at the WCDMA band. Envelope correlation coefficient (ECC) of 0.0002-0.05 is obtained for all bands. The average gain and efficiency are measured to range from -4.69 dBi to -2.88 dBi and 33.99% to 51.5% for antenna 1, and -4.74 dBi to -2.97 dBi and 33.45% to 50.49% for antenna 2, respectively.
Omnidirectional Resonator in X-Y Plane Using a Crisscross Structure for Wireless Power Transfer
Kim, Donggeon ; Seo, Chulhun ;
Journal of electromagnetic engineering and science, volume 15, issue 3, 2015, Pages 194~198
DOI : 10.5515/JKIEES.2015.15.3.194
Magnetic resonant coupling is more efficient than inductive coupling for transferring power wirelessly over a distance. However, a conventional resonant wireless power transfer (WPT) system requires a transmitter and receiver pair in exactly coaxial positions. We propose a resonator that can serve as an omnidirectional WPT system. A magnetic field will be generated by the current flowed through the transmitter. This magnetic field radiates omnidirectionally in the x-y plane because of the crisscross structure characteristic of the transmitter. The proposed resonator is demonstrated by using a single port. To check the received S21 and transfer efficiency, we moved the receiver around the transmitter at different distances (50-350 mm). As a result, the transmission efficiency is found to be 48%-54% at 200 mm.