• Proceedings of the KIPE Conference
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• 2013.07a
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• pp.47-48
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• 2013

In order to evaluate the response of the grid-connected systems, Phase lock technology is widely used in power electronic devices to obtain the phase angle, amplitude, and frequency of the grid voltage because phase locked loop (PLL) algorithms are very important for grid synchronization and monitoring in the grid connected power electronic devices. This paper presents a performance evaluation in tracking grid angular frequency through single phase synchronization techniques which are an enhanced PLL (EPLL), second-order generalized integrator-PLL (SOGI-PLL), and second-order generalized integrator-frequency locked loop (SOGI-FLL). These techniques are properly analyzed through several steps to get the best technique which can track the frequency accurately and smoothly.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.71-72
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• 2015

본 논문에서는 전자기유도현상을 이용한 에너지 하베스터의 AC 출력 전압을 DC 전압으로 바꾸는 고효율 정류회로를 제안한다. 하베스터에서 다이오드의 문턱전압보다 낮은 전압이 생산될 수도 있을 뿐더러, 더 높은 전압이 생산된다 해도 결국 다이오드 정류를 거치면 엄청난 손실이 생기기 때문에 기존의 다이오드를 이용한 정류회로는 작은 AC 전압을 생산해내는 전자기유도현상을 이용한 에너지 하베스터와는 맞지 않다. 따라서 제안하는 정류회로는 별도의 전원을 필요로 하지 않는 스위치 회로를 갖추어 MOSFET과 LC공진을 이용하여 부스팅 후 정류를 그 목적으로 한 고효율 정류회로이다. 본 논문에서는 MOSFET과 LC공진회로의 특성을 이용한 고효율 정류회로를 설계, 동작원리를 설명하고, PSIM 시뮬레이션을 통하여 그 유용성을 검증한다.

• Fashion & Textile Research Journal
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• v.17 no.1
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• pp.64-73
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• 2015

This paper examines the characteristics of Hungarian women's costumes under the Reign of the Habsburg Empire in the $19^{th}$ Century. Since the beginning of the $19^{th}$ century, the Habsburg Empire inflicted strong oppression on Hungary. Under the influence of the European upper class, exaggerated and sumptuous costumes were fashionable in the Hungarian Aristocracy. They preferred blouses decorated with colorful embroidery, pleated sleeves, gorgeous beads and lace, long pleated skirts with velvet borders, corsets decorated with delicate embroidery, coats adorned with lace, and capes. However, Hungarian nationalists protested against the Habsburg Empire's oppression; consequently, Hungarian national costumes expressed a sense of resistance and solidarity. The results of the study are as follows. The Hungarian women's costumes were different from women's costumes of the Habsburg Empire in regards to headdress, bodice, apron, pattern and shoes. The Hungarian women's headdress consists of the parta and veil. The bodice is richly adorned with colorful embroidery and differs from skirts in color and material. The Hungarian women's apron is distinct from the Habsburg Empire as a unique Hungarian item. Finally, Hungarian costumes are characterized by the Oriental pattern and short boots with metal heels.