• Proceedings of the Korean Fiber Society Conference
• /
• 2003.04a
• /
• pp.150-153
• /
• 2003

Microwaves belong to the portion of the electromagnetic spectrum with frequencies between 300MHz and 300GHz.$\^$1)/ In microwave processing, the energy is delivered directly to materials through molecular interaction with the electromagnetic field. This result in rapid heating throughout the material thickness with the reduced thermal gradients. If microwave is applied to fibrous materials, it can be reduced processing time. (omitted)

• Journal of Electrical Engineering and Technology
• /
• v.10 no.1
• /
• pp.308-313
• /
• 2015

This paper describes a technique for complete identification of a two-dimensional scattering object and multiple objects immersed in air using microwaves where the scatterers are assumed to be a homogenous dielectric medium. The employed technique consists of initially retrieving the shape and position of the scattering object using a linear sampling method and then determining the electric permittivity and conductivity of the scatterer using adjoint sensitivity analysis. Incident waves are assumed to be TM (Transverse Magnetic) plane waves. This inversion algorithm results in high computational speed and efficiency, and it can be generalized for any scatterer structure. Also, this method is robust with respect to noise. The numerical results clearly show that this hybrid approach provides accurate reconstructions of various objects.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2009.06a
• /
• pp.149-150
• /
• 2009

In this paper we study on the semiconductor characteristic by calculating the variation of reflection function in microstrip lines, which has open-ended termination containing an optically induced plasma region. The variation of impedances resulting from the presence of plasma has evaluated with time and frequency domain. The responses have been also evaluated theoretically for changing the phase of the variation in the reflection.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.12 no.3
• /
• pp.1039-1044
• /
• 2011

Magnetron is applied in microwave ovens for generating microwaves. It is composed of r-fin, yoke, A/F seals, gasket base, filter box. The temperature is occurred highly, when magnetron operate in its systems. Therefore the thermal characteristics must be considered in the design of magnetron. Because of its geometric complex, it is difficult to analysis the thermal characteristics. In this paper, temperature analysis is performed for all components. The commercial software ANSYS is used to consider both conduction and convection. The analysis is carried out by adding each component. An experiment on the thermal characteristics is performed to verify the reliability for simulation.

• Proceedings of the KIEE Conference
• /
• 2001.07c
• /
• pp.1835-1837
• /
• 2001

The interference of electromagnetic waves in factory is increasing according with development of industrial society and many use of electrical machinery. Electromagnetic wave is defined as the electrical and magnetic field formed by electrical and electronic equipment used in daily lives, which indiscriminatingly affects the human health and operation of machinery. The electromagnetic spectrum ranges from the shorter wavelengths(including gamma and x-rays) to the longer wavelengths(including microwaves and broadcast radio waves). Radiation that is not absorbed or scattered in the atmosphere can reach and affect on the operation of machine. In this study, electromagnetic wave that is interfered to the machine and human is detected in factory, and decrease method of electromagnetic wave interference is studied.

• Korean Journal of Optics and Photonics
• /
• v.15 no.3
• /
• pp.274-277
• /
• 2004

An integrated photonic radio frequency (RF) phase shifter has been proposed and fabricated using a nested dual Mach-Zehnder modulator configuration in a new electro-optic polymer. The fabricated device shows a continuous voltage control of the RF signal phase. A near-linear phase shift exceeding 108$^{\circ}$was obtained for a 16-GHz microwave signal by tuning the do control voltage over a 7.8- $V_{pp}$ range.e.

• Textile Coloration and Finishing
• /
• v.10 no.4
• /
• pp.7-14
• /
• 1998

Microwaves are high frequency radiation capable of generating very rapid, uniform and efficient heating of textile material. Microwave heated dyeing of polyester fabric was tried with different solvent systems, irradiation time and dye concentration. Microwave fixation methods were used with 100% water,30% urea, EG and DMF, respectively, pad-baths in which the padded fabrics were exposed over a heated or boiling water bath to maintain sufficient moisture content during irradiation. In order to ascertain the relation between the dyeing property of polyester fabric and the microwave irradiation condition caused by microwave heating, the K/S values and fastness properties of dyed fabrics such as light, washing and sublimation fastness were measured.

• Proceedings of the KIEE Conference
• /
• 2008.07a
• /
• pp.1432-1433
• /
• 2008

Disruption and upset of computer system from intentional unintentional electromagnetic wave is not tenable, if the equipment is used in a security or safety critical application. This paper examines susceptibility of computer network to the HPM. The susceptibility level for PC-systems has been assessed using anechoic chamber. The some failure mode were observed in PC-system. Based on the results, susceptibility of computer network can be applied to database to elucidate the effects of microwaves on electronic equipment.

• Journal of Radiation Protection and Research
• /
• v.36 no.1
• /
• pp.1-7
• /
• 2011

A simple mathematical model of simultaneous combined action of environmental agents has been proposed to describe the synergistic interaction of microwave and high ambient temperature treatment on animal heating. The model suggests that the synergism is caused by the additional effective damage arising from an interaction of sublesions induced by each agent. These sublesions are considered to be ineffective if each agent is taken individually. The additional damage results in a higher body temperature increment when compared with that expected for an independent action of each agent. The model was adjusted to describe the synergistic interaction, to determine its greatest value and the condition under which it can be achieved. The prediction of the model was shown to be consistent with experimental data on rabbit heating. The model appears to be appropriate and the conclusions are valid.

• Vacuum Magazine
• /
• v.2 no.4
• /
• pp.16-26
• /
• 2015

Carbon nanomaterials including nanocrystalline diamond and graphene films are expected to play a core role in $21^{st}$ century industries due to their amazing physicochemical properties. To achieve their practical utilization and industrialization, the development of their mass production technologies is strongly required. Recently, a surface wave excited plasma (SWP) which is produced using microwaves has been attracting special attentions as a candidate for the mass production technology of carbon nanomaterials. SWP can allow a low-temperature large-area plasma chemical vapor deposition (CVD) system. Here, this article introduces the promising SWP-CVD technology. Plasma characteristics in a SWP will be introduced in detail to help understanding how to use and control a SWP as a plasma source for CVD applications.