• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.19 no.2
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• pp.244-249
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• 2008

In this paper, we designed and fabricated the EM wave absorber consists of Sendust and Mn-Zn ferrite for suppressing EM wave noise from PCB in ISM(Industrial, Scientific and Medical) band of 2.4 GHz. We fabricated several samples in different ratios of Sendust to Mn-Zn ferrite with CPE(Chlorinated Ploy-ethylene) as binder and confirmed that optimum composition ratio of absorbing materials was Sendust. Mn-Zn ferrite : CPE=70:5:20 wt.%. The absorbing abilities were simulated according to different thickness of EM wave absorber as the function of material constants calculated by measured data. Measured absorption ability was analyzed and compared with simulated result. The simulated result agree well with the measured ones. As a result, the developed EM wave absorber with thickness of 0.85 mm has absorption ability of 5.4 dB at 2.4 GHz and over 3 dB in frequency rage of 1.4$\sim$4.1 GHz.

• Journal of Acupuncture Research
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• v.33 no.2
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• pp.117-133
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• 2016

Objectives : Traditional Korean Emergency Medicine (EM) has been developing for thousands of years, however its value was not properly considered after 19th century modernization. The purpose of this study was to review the current status of EM in Korean Medicine and suggest methods for improvement. Methods : We performed systematic reviews of the definition, current medical system, and educational curriculum of EM in Western Medicine, traditional Korean and Chinese Medicine, and integrated Western and traditional Chinese medicine with the use of medical classics and text books. We also analyzed the trends in published research articles to discuss the current situation in the field of traditional Korean EM, and to provide methods for its establishment and development with traditional Korean medicine. Results : The definition of EM as a treatment of acute disease shares common understanding among traditional Korean, Chinese, and Western medicine. We presented descriptions of EM in many medical classics, however current law and EM service does not include these. As for the review of publications during the last 20 years, we found 21 articles in several fields that confirmed the need for more investigation. Conclusion : Traditional Korean EM has a long history and clinical experiences that can be found in medical classics, textbooks and research articles. There is an urgent need for more studies on traditional Korean EM as an emergency medical service system, and in terms of educational curriculum and related policies to improve Evidence-Based teaching.

• Korean Journal of Organic Agriculture
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• v.14 no.4
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• pp.433-443
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• 2006

With treatment of Kitosan, Wood vinegear and EM(effective microoganism) which farmers call it as substance in fertilizing, conditioning and disease control substances, authors in vestigated on microorganisms change in soil and ealy growth characteristics of tomato. The results were summarized as follows: Among foliar application of kitosan, wood vinegear and EM(effective microoganism) treatments diluted by chitosan 500 times solution level was effective considering growth of tomato as compared other dilutions and control plot. Change of microorganism number in the soil for cultivation of tomato was increased with microorganism treatment plot as compared with control plot. Specially chitosan 500 times solution level showes the most significant effect.

• Nuclear Engineering and Technology
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• v.40 no.3
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• pp.213-224
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• 2008

The pumping of coolant in a liquid metal fast reactor may be performed with an annular linear induction electro-magnetic (EM) pump. Linear induction pumps use a traveling magnetic field wave created by poly-phase currents, and the induced currents and their associated magnetic field generate a Lorentz force, whose effect can be the pumping of the liquid metal. The flow behaviors in the pump are very complex, including a time-varying Lorentz force and pressure pulsation, because an induction EM pump has time-varying magnetic fields and the induced convective currents that originate from the flow of the liquid metal. These phenomena lead to an instability problem in the pump arising from the changes of the generated Lorentz forces along the pump's geometry. Therefore, a magneto-hydro-dynamics (MHD) analysis is required for the design and operation of a linear induction EM pump. We have developed a time-harmonic 2-dimensional axisymmetry MHD analysis method based on the Maxwell equations. This paper describes the analysis and numerical method for obtaining solutions for some MHD parameters in an induction EM pump. Experimental test results obtained from an induction EM pump of CLIP-150 at the STC "Sintez," D.V. Efremov Institute of Electro-physical Apparatus in St. Petersburg were used to validate the method. In addition, we investigated some characteristics of a linear induction EM pump, such as the effect of the convective current and the double supply frequency (DSF) pressure pulsation. This simple model overestimated the convective eddy current generated from the sodium flow in the pump channel; however, it had a similar tendency for the measured data of the pump performance through a comparison with the experimental data. Considering its simplicity, it could be a base model for designing an EM pump and for evaluating the MHD flow in an EM pump.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.24 no.3
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• pp.43-50
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• 1979

The effect of planting time and density of soybean on the yield component and yield when intercropped within barley rows or seeded after harvest was evaluated. Early maturing barley variety 'Olbori' was seeded at 2 levels of planting density 40 ${\times}$ 18 and 60 ${\times}$ 18 (row-hill space in em), and the soybean, variety "Dongbuktae", was seeded on June 1 as a inter-crop, June 15 and 30 as a afterharvest crop, all 2 levels of row space (40, 60 cm) and 3 levels of hill space (10, 15, 20 em). Soybean yield was increased in the following conditions: early seeding of soybeans within rows at 60 ${\times}$ 20 em density and soybean seeding after barley harvest at 40 ${\times}$ 20 em density./TEX> 20 em density.

• Journal of electromagnetic engineering and science
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• v.12 no.1
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• pp.20-25
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• 2012

In this paper, the EM wave absorber for ETC system was designed and fabricated. We fabricated several samples in different composition ratios of flaked sendust and CPE(Chlorinated Polyethylene). Absorption abilities were simulated in accordance with different thicknesses of the prepared absorbers and changed complex relative permittivity and permeability according to composition ratio. The optimized mixing ratio of flaked sendust and CPE was found as 60 : 40 wt.% by experiments and simulation. Then the EM wave absorber was fabricated and tested using the simulated data. As a result, the developed EM wave absorber has the thickness of 2.75 mm and absorption ability was 22.5 dB in the case of normal incidence at 5.8 GHz. Therefore, it was confirmed that the newly developed absorber can be used for ETC system.

• Progress in Superconductivity and Cryogenics
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• v.13 no.3
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• pp.1-4
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• 2011

This paper deals with the design and fabrication of prototype superconducting hybrid electromagnet(SH-EM) for EMS (Electromagnetic suspension)-based Maglev. The design requirements are based on the normal conducting EM used in the German high-speed Maglev. From the MMF-Levitation force curves simulated by FEM analysis, the required MMF by superconducting coil is suggested. As an experimental test setup to demonstrate the SH-EM, the experimental SH-EM with HTS coil cooled in $LN_2$ is fabricated. From the expected operating current of the HTS coil, the levitation performance of the SH-EM is estimated.

• Journal of the Korean housing association
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• v.20 no.3
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• pp.105-112
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• 2009

The purpose of this study is to investigate a top floor, indoor, thermal environment by comparison between the indoor air temperature and the rooftop surface temperature, and between the indoor air temperature and the outdoor air temperature using an experimental model. The model experiment was conducted with 4 cases,: no-rainfall, 1 em-height, 10 em-height and 20em-height of rainfall on the rooftop. According to the results of the height of stored rainfall, the average air temperature difference between the indoor and outdoor air with 1, 10 and 20 em-height of rainfall on the rooftop was $4.0^{\circ}C$, rooftop $1.2^{\circ}C$ and rooftop $1.0^{\circ}C$, respectively. The upper 10 em-height of rainfall on the rooftop acted to decrease the indoor air temperature on the top floor.

• Proceedings of the Korean Society of Marine Engineers Conference
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• 2005.06a
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• pp.423-428
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• 2005

We prepared paint-type and sheet-type EM wave absorbers with Mn-Zn Ferrite, Ni-Zn Ferrite, Ba Ferrite, Sr Ferrite, and Sendust against ghosts of a mater in ships. To prepare the absorbers, enamel paint and epoxy paint were used as binders. The prepared EM wave absorber's absorption properties were investigated. The prepared EM wave absorbers have 6 dB over in 2 GHz ${\sim}$ 4 GHz. We compared properties of wave absorption between paint-type and spray-type

• Journal of Yeungnam Medical Science
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• v.19 no.2
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• pp.92-98
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• 2002

Emergency medicine(EM) is the specialty of evaluating, stabilizing and initiating treatment for patients with life or limb-threatening illnesses or injuries. Techniques unique to the specialty of EM are the triage systems, quick stabilization methods, and emergency surgery procedures. The field of EM encompasses areas such as emergency department management, disaster planning and management, the management of emergency medical service(EMS) systems, research into such areas as brain and heart resuscitation, trauma and disaster management, survival medicine, and environmental emergencies(cold and heat injuries, poisioning, decompression sickness and barotrauma). Today, in addition to providing emergency care, the emergency specialists have moral and legal obligations to assess and report probable cases of child and spouse abuse, sexual assault, and alcohol and drug abuse. Future, the EM should provide surveillance, identification, intervention, and evaluation of injury and disease, therefore EM will remain as a key component of evolving community health care system.