• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2014.11a
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• pp.23-25
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• 2014

에너지 하베스팅 기술은 외부의 지속적인 에너지 공급 없이 통신 시스템의 수명을 오랫동안 유지할 수 있는 수단의 하나로 각광받고 있다. 최근에는 수신한 신호에서 에너지를 얻는 전력 분배의 기법이 제안되었다. 본 논문에서는 인지 무선 통신 시스템에서 이차 사용자가 에너지 하베스팅을 사용하는 중계기를 사용할 때 중계기들 중 하나를 선택하는 기법의 불능 확률을 분석한다. 중계기는 전력 분배의 기법을 사용하여 에너지를 저장하며 선택된 중계기는 수신한 신호를 복호 후 전송한다. 컴퓨터 시뮬레이션을 통해 간섭 제약 조건과 이차 사용자의 중계기 수가 달라질 때의 불능 확률을 살펴본다.

• Electronics and Telecommunications Trends
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• v.38 no.5
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• pp.90-99
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• 2023

Recently, with the trend of information technology convergence and electrification, batteries are being widely used in fields such as industry, transportation, and specific applications. By 2030, the secondary battery market is expected to grow explosively by more than eight times compared with 2020 to $351.7 billion owing to the expanding adoption of electric vehicles. Depending on the electrochemical reactions in the electrode, a primary battery can only discharge through an irreversible reaction, while a secondary battery can be repeatedly charged and discharged using reversible reactions. According to the type of charge carrier ions, secondary batteries may be classified into those made of lithium, sodium, potassium, magnesium, and aluminum ions. We analyze the current status and technological issues of lithium-ion batteries, lithium-sulfur batteries, and solid-state batteries, which are representative examples of lithium secondary batteries. In addition, research trends in lithium secondary batteries are discussed.

• Electronics and Telecommunications Trends
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• v.38 no.6
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• pp.128-136
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• 2023

Lithium accounts for only 0.0017% of the earth crust, and it is produced in geographically limited regions such as South America, the United States, and China. Since the first half of 2017, the price of lithium has been continuously increasing, and with the rapid adoption of electric vehicles, lithium resources are expected to be depleted in the near future. In addition, economic blocs worldwide face intensifying scenarios such as competition for technological supremacy and protectionism of domestic industries. Consequently, Korea is deepening its dependence on China for core materials and is vulnerable to the influence of the United States Inflation Reduction Act. We analyze post-lithium secondary battery technologies that rely on more earth-abundant elements to replace lithium, whose production is limited to specific regions. Specifically, we focus on the technological status and issues of sodium-ion, zinc-air, and redox-flow batteries. In addition, research trends in post-lithium secondary batteries are examined. Post-lithium secondary batteries seem promising for large-capacity energy storage systems while reducing the costs of raw materials compared with existing lithium-based technologies.

• Polymer Science and Technology
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• v.23 no.3
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• pp.307-312
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• 2012

• Proceedings of the Korean Magnestics Society Conference
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• 2011.06a
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• pp.194-195
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• 2011

• 한국전기화학회:학술대회논문집
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• 2004.04a
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• pp.58-58
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• 2004

• Proceedings of the Korean Ceranic Society Conference
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• 2003.04a
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• pp.86.1-86
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• 2003

• Proceedings of the Optical Society of Korea Conference
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• 2009.10a
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• pp.26-27
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• 2009

• Proceedings of the Korea Contents Association Conference
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• 2013.05a
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• pp.349-350
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• 2013

오늘날 영화 특수효과는 영화 제작에 있어서 매우 중요한 요소중의 하나가 되었다. 본 논문은 영화 <이차노출>의 중요한 특수효과의 상세한 분석을 통하여 영화 특수효과 및 영화 인물의 감정 표현 관계에 대해서 상세히 논술하고자 한다.

• Proceedings of the Korean Vacuum Society Conference
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• 2002.02a
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• pp.59-59
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• 2002