• Proceedings of the KIEE Conference
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• 2001.11c
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• pp.50-52
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• 2001

반도체 장비간 통신의 표준인 SECS(SEMI Equipment Communication Standard)는 반도체 제조 업체에서 많이 사용되고 있다. SECS-I의 단점을 보완하기 위해 제안된 HSMS (High-speed SECS Message Services)는, TCP/IP를 지원하고 SECS-I에 비해 통신 속도가 높다. 사용자는 HSMS를 이용하여 LAN을 통한 장비 제어 및 모니터링이 가능하게 되었다. 그러나, 네트워크의 확장에 대한 관심 고조로 기존의 제한된 영역의 네트워크 구성에 대한 변화가 필요하게 되었다. 또한 사용자가 항상 LAN의 범위 내에서 장비 모니터링 및 제어하기에는 위치적 제약이 많다. 그렇지만 HSMS는 Web을 통한 데이터 전송 요구를 수용하지 못하고 있다. 따라서 SECS-II message가 Web을 통해 전송될 수 있는 새로운 포맷이 필요하다. 본 논문에서는, 구조화된 데이터를 정의하기 유리한 마크업 언어인 XML을 이용하여, SECS-II message를 Web으로 전송할 수 있는 포맷을 정의하고 이를 구현한다.

• Journal of electromagnetic engineering and science
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• v.11 no.4
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• pp.257-261
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• 2011

A highly efficient 2.4 GHz rectenna is designed using a harmonic rejection bandpass filter. The rectenna is printed on Rogers Duroid 5880 substrate with ${\varepsilon}_r$=2.2 and a thickness of 1.6 mm. The rectenna consists of a microstrip antenna and high order harmonic rejection bandpass filter, microstrip lowpass filter, and Schottky barrier diode (HSMS2820). The use of a $2^{nd}$ and $3^{rd}$ harmonic rejection microstrip bandpass filter in the rectenna results in high conversion efficiency. The proposed rectenna achieves a RF to DC conversion efficiency of 72.17 % when the received RF power is 63.09 mW.

• IEIE Transactions on Smart Processing and Computing
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• v.3 no.4
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• pp.221-225
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• 2014

Low power RF devices, such as RFID and Zigbee, are important for ubiquitous sensing. These devices, however, are powered by portable energy sources, such as batteries, which limits their use. To mitigate this problem, this study developed RF energy harvesting with W-CDMA for a low power RF device. Diodes are required with a low turn on voltage because the diode threshold is larger than the received peak voltage of the rectifying antenna (rectenna). Therefore, a Schottky diode HSMS-286 was used. A prototype of RF energy harvesting device showed the maximum gain of 5.8dBi for the W-CDMA signal. The 16 patch antennas were manufactured with a 10 dielectric constant PTFT board. In low power RF devices, the transmitter requires a step-up voltage of 2.5~5V with up to 35 mA. To meet this requirement, the Texas Instruments TPS61220 was used as a low input voltage step-up converter. From the evaluated result, the achievable incident power of the rectenna at 926mV to operate Zigbee can be obtained within a distance of 12m.

• Journal of the Korean Chemical Society
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• v.14 no.1
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• pp.91-96
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• 1970

Formation of the complexes of manganese, zinc and cobaltous ions with citrate ions in aqueous, ethanol-water (20% by volume) and acetone-water (20% by volume) solutions was studied at room temperature by the equilibrium exchange technique. The pH of the solutions was controlled to 7.0-7.4, and the ionic strength of the solutions was kept at approximately 0.10. The results of the present study indicated that both $Mn^{++}\;and\;Zn^{++}$ formed one to one citrate-compexes, [M Cit]$^-$, in all the solvent systems examined, and that $Co^{++}$ formed one to one citrate-complex in aqueous solution but formed both one to one citrate-complex, [Co Cit]$^-$, and one to two citrate-complex, $[Co\;Cit_2]^{4-}$, in the mixed solvent systems mentioned above. It was also observed that the citrate-complexes of the transition metals examined were more stable in the mixed solvent systems than in water.

• Journal of the Korean Society of Marine Environment & Safety
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• v.17 no.3
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• pp.269-274
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• 2011

The purpose of hull stress monitoring system(HSMS) is to lead hull structure to be safer at lower cost. We proposed a hull stress monitoring system for leisure boats using fiber-optic bragg grating(FBG) strain sensor. Fiber optic sensors are well suited for structure monitoring system, due to their ability to withstand harsh environments, immunity to electromagnetic interference, and reduce cabling installation cost when employing wavelength multiplexing. This paper presents an overview of current research and design of hull stress monitoring system for leisure boats.