• Advanced Industrial SCIence
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• v.2 no.2
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• pp.9-15
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• 2023

Since silicone rubber heaters are flexible, they can be directly attached or installed in objects to be heated even in flat, curved or three-dimensional shapes. Since the current heating method heats the entire object to be heated and raises it to a required temperature, ignoring areas or positions where heat is not required, partial intensive heating cannot be performed. When using multi-heating zones, rather than heating the entire object to be heated, only the parts that need heat are intensively heated according to the process, so it is possible to heat quickly by local location by applying different amounts of heat with a small amount of electric capacity to each place that needs heat, and heat energy can reduce. In this study, the temperature and heating time of the partially concentrated region in the multi-heating region structure are measured so that a uniform temperature or temperature difference occurs in the region requiring thermal fusion. In order to determine the optimal power density range and reduce capacitance, the safety of a silicon rubber heater manufactured with a multi-heating zone structure is investigated. If the silicon rubber heater is manufactured in a multi-heating method, the multi-intensive heating technology can be ideally applied to all heating processes.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.1662-1663
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• 2011

본 논문에서 하지 정맥 지료를 위한 마이크로파 시스템에서 사용될 가열 안테나의 전계 분포를 균일하게 형성시키기 위해 철사 도파관 안테나를 설계 및 제작하였다. 일반적인 도파관 안테나에 경우 안테나 중심 부분에 전계가 가장 세게 분포되어 온도가 다른 곳에 비해 차이가 많이 나므로 인체 피부가 회상을 입힐 위험이 있다. 제안된 철사 도파관 안테나는 끝단에 가느다란 철을 이용하여 전기장을 철사 부분에 집중시켜 안테나 중앙 부분에 집중된 전기장을 분산되도록 설계하였다. 따라서 전기장을 소스로 하는 온도도 균일하게 분포하게 된다. 제안된 철사 도파관 안테나 내부의 전계 분포는 Ansoft 사의 HFSS, 온도 분포는 CST 사의 MWS(Microwave Studio)를 이용하여 시뮬레이션을 하였고, 일반적인 안테나 경우보다 더 균일한 전계와 온도 분포 특성을 보임을 확인하였다. 제작된 철사 안테나는 사용주파수 15GHz에서 -10dB 이하의 반사 손실을 보였다. 또한 안테나 타당성을 검증하기 위해 개구면 앞에 돼지 껍데기를 두고 일정시간 가열하여 일반 안테나와 제안된 철사 도파관 안테나 온도 분포를 비교하였다. 열화상 카메라를 이용한 실험결과 일반 안테나에 경우 중앙과 가장 자리부분 사이에 약 $29^{\circ}C$, 제안된 철사 도파관 안테나에 경우에는 약 $12.5^{\circ}C$의 차이를 보였다. 이를 통해 제안된 철사 도파관 안테나가 전계 분포 균일성 향상에 기여함을 확인하였다.

• Radiation Oncology Journal
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• v.9 no.2
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• pp.171-176
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• 1991

To evaluate the temperature distribution according to the size of the electorde and the thickness of the phantom using 8MHz radiofrequency capacitive heating device, various sized electrodes and phantoms were used in combination. The radii of the electrodes are 10, 15, 20, 25, and 30 cm and the thickness of cylindrical phantoms with diameter 30 cm were 10, 15, 20, 25, 30, and 35 cm. When the thickness of the phantom was 25 cm or 30 cm, homogenous heating was achieved by using the electrode which diameter was equal to or greater than the thickness of the phantom. When the thickness of the phantom was 20 cm or less. homogenous heating was not achieved by using the electrode which diameter was equal to the thickness of the phantom, but achieved by the larger diameter of the electorode. When the sizes of paired electrodes were not equal, the smaller electrode side was preferentially heated.

• Journal of Internet of Things and Convergence
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• v.7 no.3
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• pp.63-68
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• 2021

Domestic electric heater manufacturers are focusing on technology development to improve the efficiency of existing products. The electric heater for ship fuel is large in size and has high difficulty in miniaturization/high efficiency, so there are not many companies that try to develop technology yet. The existing electric heater has a structure of low heating efficiency because the contact time with the heat exchange tube of the heating medium is very short because the flow path of the ship engine fuel is monotonous. Since it is manufactured in a tubular shape, the volume is very large regardless of the heating efficiency. As a result, the tubular electric heater device applied by overseas advanced companies has difficulty in maintaining and repairing because it is necessary to decompose all tubular heaters when a specific part of the inside is damaged and if the heat exchange tube is damaged, all the heat exchange tubes must be decomposed. In this study, a basic study on plate type electric heaters capable of heating 10 tons of ship engine fuel per hour and setting a maximum temperature of up to 150℃ was conducted through a 250kW capacity plate type electric heater.

• Journal of Global Scholars of Marketing Science
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• v.2
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• pp.39-57
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• 1998

IMF위기 이후 여러 가지로 어려움에 처해 있는 경제를 회복하기 위한 돌파구로서 외국기업과 자본의 유치의 중요성이 더해지고 있다. 특히 대규모 기업의 구조조정과 기업들의 투자마인드 위축으로 어려움을 겪고 있는 지방경제를 활성화하기 위한 수단으로서의 투자유치는 먼저, 외국자본의 직접투자를 통하여 단기간에 산업기반을 강화할 수 있고, 제조업의 해외이전에 따른 산업공동화를 방지할 수 있다. 또한 당면한 과제인 고실업을 해소하기 위해서도 필요하다. 정부는 '98, 9. 17. 외국인투자유치촉진법을 제정, 공포하고, 시행령을 마련하여, 국세와 지방세의 감면혜택은 물론 분양가와 조성원가와 차액보조금, 고용보조금, 직업훈련비등의 인센티브를 보완한다. 경상남도의 외국인투자유치전략으로는 경남의 입지적 경쟁우위를 확보할 수 있는 업종을 선정하여 중점유치활동을 전개하고 있다. 이를 위한 구체적 방안으로는 첫째, 투자유치과를 신설하고 전문직공무원을 채용하였고, 민간전문가를 기업으로부터 파견받아 기존 공무원이 담당하기 힘든 부분을 담담토록 하고 있고, 둘째, 진사지방산업단지를 외국인투자지역으로 지정하고 하였다. 셋째, 외국인투자기업에 대한 여러 가지 인센티브를 위하여 경상남도 기업 및 투자 유치조례(안)을 입안중이다. 넷째, 투자유치 타켓기업을 선정하여 집중유치활동을 전개하고 있으며, 다섯째, 경남도내에 이미 투자한 기업에 대한 사후관리를 철저히 하여 경영상의 애로사항 해결에 만전을 다 할 것이다. 지방자치제의 실시로 지방자치단체간의 경쟁이 가열되고 있으나 투자유치활동에 있어서 동서의 협력방안을 모색해 보았으며, 공동투자프로젝트 개발, 공동투자유치설명회 개최, 투자 유치기법의 상호 벤치마킹 등이 필요하다. 결론적으로 외국인 투자촉진법 등 법령의 정비와 외국인 투자유치의 중요성에 대한 인식이 확산되어 외국인 투자유치의 환경이 획기적으로 개선될 것으로 기대된다. 지방자치단체에서도 투자를 기다리던 관행에 탈피하여 입체적인 투자유치노력을 전개해야 할 것이다.

• Radiation Oncology Journal
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• v.8 no.1
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• pp.133-136
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• 1990

Intracavitary brachytherapy combined hypertermin for utero-conical cancer seems to be a promising method for salvage treatments in persistent tumors and inoperable or previously irradiated cervical recurrences. In order to heat the vaginal apex and uterus, powerfull conical antennas which are suitable for afterloading cervical applicator have been designed for use in conjuction with intracavitary radiation therapy. The antennas were constructed with conical conductive material to feed line and the effective lenght were designed proportional to microwave length, Power deposition profiles of 2450 MHz of conical antennas were studied in both phantom models and muscle tissue and compared to those of commonly used dipole antenna. Improvement of the heating pattern was found in both phantom and muscle tissue. The heating pattern produced by the conical antenna resembles an ellipsoid and then the temperature distribution in depth was extended to $2\~3\;cm$ from the effective antenna axis.

• Journal of the Korean Crystal Growth and Crystal Technology
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• v.29 no.6
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• pp.383-388
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• 2019

High purity SiC fine powder with metal impurity contents of less than 1 ppm was synthesized by improved carbothermal reduction process, and the synthesized powder was used for SiC single crystal growth in RF heating PVT device at temperature above 2,100℃. In-situ x-ray image analyzer was used to observe the sublimation of the powder and single crystal growth behavior during the growth process. SiC powder was used as a source of single crystal growth, exhausted from the outside of the graphite crucible at the growth temperature and left graphite residues. During the growth, the flow of raw materials was concentrated in the middle and influenced the growth behavior of SiC single crystals. This is due to the difference in temperature distribution inside the crucible due to the fine powder. After the single crystal growth was completed, the single crystal ingot was cut into a 1 mm thick single crystal substrate and finely polished using a diamond abrasive slurry. A dark yellow 4H-SiC was observed overall of single crystal substrate, and the polycrystals generated in the outer part may be caused by the incorporation of impurities such as the bubble layer mixed in the process of attaching the seed crystal to the seed holder.