• Proceedings of the Korea Concrete Institute Conference
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• 2006.05b
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• pp.649-652
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• 2006

This paper describe the performance of seawater purification, to which living organisms can adapt, and the physical properties of porous concrete with continuous void. Although conventional concrete has been regarded as a destroyer of nature, seawater and air can pass freely through concrete when it is made porous by forming continuous void. This not only enables plants to vegetables, but also makes it possible for microscopic animals and plants, including bacteria, to attach to and inhabit uneven surface as well as internal voids when the concrete is provided in a natural seawater area or seawater side area. As a result, porous concrete using recycled aggregate improved the performance of seawater purification. In this study, The performance of seawater purification of porous concrete using recycled aggregate analyzed by T-P, T-N.

• Carbon letters
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• v.28
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• pp.1-8
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• 2018

Graphene is a single atomic layer of carbon atoms, and has exceptional electrical, mechanical, and optical characteristics. It has been broadly utilized in the fields of material science, physics, chemistry, device fabrication, information, and biology. In this review paper, we briefly investigate the ideas, structure, characteristics, and fabrication techniques for graphene applications in lithium ion batteries (LIBs). In LIBs, a constant three-dimensional (3D) conductive system can adequately enhance the transportation of electrons and ions of the electrode material. The use of 3D graphene and graphene-expansion electrode materials can significantly upgrade LIBs characteristics to give higher electric conductivity, greater capacity, and good stability. This review demonstrates several recent advances in graphene-containing LIB electrode materials, and addresses probable trends into the future.

• Journal of Electrochemical Science and Technology
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• v.11 no.3
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• pp.195-219
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• 2020

Today, rechargeable lithium-ion batteries are an essential portion of modern daily life. As a promising alternative to traditional energy storage systems, they possess various advantages. This review attempts to provide the reader with an indepth understanding of the working mechanisms, current technological progress, and scientific challenges for a wide variety of lithium-ion battery (LIB) electrode nanomaterials. Electrochemical thermodynamics and kinetics are the two main perspectives underlying our introduction, which aims to provide an informative foundation for the rational design of electrode materials. Moreover, both anode and cathode materials are clarified into several types, using some specific examples to demonstrate both their advantages and shortcomings, and some improvements are suggested as well. In addition, we summarize some recent research progress in the rational design and synthesis of nanostructured anode and cathode materials, together with their corresponding electrochemical performances. Based on all these discussions, potential directions for further development of LIBs are summarized and presented.

• Proceedings of the KIEE Conference
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• 2001.05a
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• pp.123-125
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• 2001

In general, the PSS/E program is used for analyzing KEPCO System in terms of stability and the EMTDC Program is needed to analyze the transient characteristics of power system. The FSS/E provides various control models such as exciter. governor and PSS models whereas there ale few control of models in EMTDC. In this paper. we developed an EMTDC model for IEEET3 exciter which has been applied in KEPCO system. The EMTDC model is developed by examining PSS/E control block and using User Define Model in addition to default.lib provided by EMTDC we verify the correctness of developed IEEET3 model with PSS/E and EMTDC simulation results for the same test system.

• Proceedings of the IEEK Conference
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• 1999.06a
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• pp.699-707
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• 1999

It cannot be argued that speech is the most natural interfacing tool between men and machines. In order to realize acceptable speech interfaces, highly advanced speech recognizers and synthesizers are inevitable. Text-to-Speech(TTS) technology has been attracting a lot of interest among speech engineers because of its own benefits. Namely, the possible application areas of talking computers, emergency alarming systems in speech, speech output devices fur speech-impaired, and so on. Hence, many researchers have made significant progresses in the speech synthesis techniques in the sense of their own languages and as a result, the quality of currently available speech synthesizers are believed to be acceptable to normal users. These are partly why the MPEG group had decided to include the TTS technology as one of its MPEG-4 functionalities. ETRI has made major contributions to the current MPEG-4 TTS among various MPEG-4 functionalities. They are; 1) use of original prosody for synthesized speech output, 2) trick mode functions fer general users without breaking synthesized speech prosody, 3) interoperability with Facial Animation(FA) tools, and 4) dubbing a moving/animated picture with lib-shape pattern information.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2002.11b
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• pp.54-54
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• 2002

The nucleotide sequence of a Korea isolate of broad bean wilt favavirus from Rehmannia glutinosa Lib., designated BBWV-RE, was determined. Direct amino acid sequencing of the virus coat proteins suggests that a comparison of several favaviruses in terms of nucleotide sequence and amino acid sequences showed that BBWV-2 isolates display high sequence identity. The small coat protein genes of RNA-2 were also determined for three other Japanese isolates(E, L, and 1-2) and two ATCC isolates(PV132 and PV176) of BBWV. the CP sequence suggested distinct evolution lineages. Serotype 2 favaviruses are more prevalent in Asia, Australia and North America, Wheres serotype 1 is more prevalent in europe.(중략)

• Annual Conference on Human and Language Technology
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• 1996.10a
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• pp.51-58
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• 1996

한자(漢子)로 기술된 용어를 한글로 자동변환하여 색인어로 사용하는 경우에 한글의 음운체계나 해당 시스템의 색인정책에 맞지 않는 일이 생기게 된다. 이런 문제가 생기는 원인은 해당 한자에 대응하는 정확한 한글을 입력하지 않고 변환하였을 경우, 해당 한자의 음이 없거나 한자와의 음운체계가 달라 생기는 경우 및 별도의 색인정책이 있는 경우 등을 생각할 수 있다. 본고에서는 KS C 5601 표준코드(이하 표준코드라 한다)를 기준으로 한자(漢子)의 다음자(多音子)를 조사하였다. 다음자(多音子)가 포함되어 있는 사전용어와 다음자(多音子)파일을 이용하여 매핑파일을 구축함과 동시에 매핑파일을 보완함으로써 한자(漢子)로 기술된 용어의 바른 한글음을 자동생성하여 색인어로 사용할 수 있는 방안에 대하여 논한다.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.1430-1431
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• 2008

In this paper, a optical current transformer has been designed and favricated to improve temperature stability caused materials properties and insulation in measuring system, suing single crystal as faraday effect cells. We used 850[nm] Laser diode as the light source and PIN Photodiode as receiver. For the experiment, the temperature transformation device make by aluminum. The range of current was from 0[A]$\sim$1600[A] and the range of temperature was from -20[$^{\circ}C$] to 50[$^{\circ}C$]. In a same experimental condition magnitude increased input current increase follow by increasing proportion of input current. The result of this study shows that characteristics of OCT are good, and it can be reflected for practical optical sensors.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.1222-1223
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• 2008

Nanocomposites of a epoxy resin are synthesized and evaluated. the present study investigated the effect of nanoclay additives on the properties of diglycidyl ether or bisphenol A(DGEBA) epoxy resin. DGEBA was mixed with 3$\sim$7 wt% organically modified layered silicate, Cloisite 30B for three hours. The average grain size of the specimens decreased with adding Cloisite 30B. The dielectric constant showed between 3.2$\sim$3.5 and the dielectric loss showed between 3.2$\sim$5.7 % in all specimens. Dielectric strength showed a best valu of 20.8 kV/mm at added with Cloisite 30B 5 wt%.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.1234-1235
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• 2008

To add Nanofiller in the epoxy which is used with the solid insulation material of existing and is a research which observes the improvement of the structural quality to produce the Nanocomposite. Montmorillonite uses with Nanofiller, MMT of the content expense (wt%) which is various and mixed an epoxide and produced sample. According to content of the sample result MMT according to respectively content expense to measure SEM photographing which is the possibility of knowing the minute structure of section with sample where is produced and the tensile strength will be able to observe the change of quality. MMT silicate layer uniformly more in the result and within epoxy matrix, being dispersed, will be able to observe.