• Proceedings of the Materials Research Society of Korea Conference
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• 1997.10a
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• pp.33-33
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• 1997

• Proceeding of KASS Symposium
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• 2006.05a
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• pp.121-125
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• 2006

• Journal of Korean Association for Spatial Structures
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• v.7 no.4
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• pp.21-29
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• 2007

• LP가스
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• s.93
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• pp.39-46
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• 2004

블루스카이와 화물연대가 공동으로 10월 11일 국가인권위원회에서 토론회를 갖고 정부의 에너지 상대가격 조정방안에 대한 보완대책 등에 대해 의견을 나눴다. 화물연대와 산업연구원 발표내용을 게재한다.

• Economic and Environmental Geology
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• v.37 no.4
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• pp.375-381
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• 2004

Pyrochlore was known as one of the most promising materials for the immobilization of radioactive actinide. This study includes the synthesis, phase relation and characteristics of pyrochlores (CaCeH$f_xTi_{2-x}O_7$=0.2, 0.6, 1.0, 1.4, 1.8, 2.0) in the system of Ca-Ce-Hf-Ti-O. The samples were prepared from high purity of starting materials under the pressure of 400kg/cm$^2$ at room temperature, and were sintered at 1200∼1$600^{\circ}C$ The synthesized samples were analyzed and identified with XRD. The optimal formation conditions of pyrochlores were at 1300∼150$0^{\circ}C$ under $O_2$ atmosphere with batch compositions. During synthesis, pyrochlore, perovskite and $A_{2}BO_{5}$ oxide were formed. The characteristics of this system is that parameter of pyrochlore was increased with the content of hafnium. This phenomenon was due to the difference of ionic size between hafnium and titanium in six coordinated site.

• The Journal of the Korea Contents Association
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• v.8 no.3
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• pp.75-85
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• 2008

Since the first interactive broadcasting of Skylife had been launched in S. Korean it has passed over 4 years. Subsequently the new digital broadcasting platforms, such as DMB, Mobile-TV, IPTV and so forth, are appearing between the keen rivalries. At the centre of diagram for new digital platforms there is positioned the interactivity. In order to cope with the limitation of contents on television, even Korean terrestrials have resolutely carried out interactive broadcasting as of 8th of June, 2006. Although the flamed competition of digital environment there are lacking in the public understanding and interests for interactive programmes on digital television. We can be analysed that it is difficult to acquire the viewer's satisfaction for guessability in spite of our governmental efforts. Here it presents the problematic results obtained by analysing both quantitative and qualitative data from the usability test for the current interactive programme in centre of the viewer.

• Journal of KIISE:Computing Practices and Letters
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• v.15 no.12
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• pp.938-942
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• 2009

In this paper, we propose a novel filtering method for processing continuous skyline queries on wireless sensor network environments. The existing filtering methods use the filter based on router paths. However, because these filters are applied not to a whole area but to a partial area, these methods send almost data of sensor nodes to transmit to the base station and have no sufficient effect in terms of energy efficiency. Therefore, we propose an efficient method to dramatically reduce the transmission data of sensors through applying a low-cost and effective filter to all sensor nodes. The proposed effective filter is generated by using characteristics such as the data locality and the clustering of sensors. An extensive performance study verifies the merits of our new method.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2010.06a
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• pp.328-328
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• 2010

압전 세라믹스는 엑츄에이터 및 센서 등의 다양한 응용분야로 인하여 많은 연구가 진행되어왔다. 최근 친환경 무연 압전계인 Bi층상구조 (BNT) 및 알칼리 니오븀산화물계 (KNN)에 대한 연구가 집중되고 있다. 한편, 소형화 및 고성능의 압전소자에 대한 요구 증가로 고가의 내부전극인 Ag, Ag-Pd합금으로 이루어진 적층압전소자에 대한 연구개발이 진행되어 왔다. 본 연구에서는 Ni이나 Cu를 내부전극으로 사용하는 적층압전소자의 개발가능성을 타진하고자 Ni의 산화를 억제할 수 있는 환원분위기 소결시에 압전소재의 상변화 및 내환원성 정도를 조사하였다. 압전소재인 BNT 및 KNN를 공기중에서 합성한 후, 환원분위기의 영향을 조사하고자 샘플을 디스크 형태로 성형하여 $1000{\sim}1200^{\circ}C$에서 2 시간 동안 공기, 중성 (N2) 와 환원 분위기 (3 % H2 - 97 %의 N2) 에서 소결한 후 미세구조와 전기적 특성을 SEM, EDS, XRD, impedance analyzer로 조사였다. 환원분위기에서 소결된 BNT 샘플은 페롭스카이트 상이 관찰되지 않았으며, SEM/EDS 분석결과 시편의 표면에 Bi의 석출이 관찰되었다. KNN의 경우에는 공기중에서 소결 시편뿐만 아니라 환원분위기에서 소결된 시편에서도 페롭스카이트 구조를 보였으며, EDS분석결과 K 및 Na의 휘발이 비교적 적었다.

• Applied Chemistry for Engineering
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• v.24 no.5
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• pp.507-512
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• 2013

Perovskite-type oxides were successfully prepared using microwave-assisted process, and by XRD, XPS, BET, and $H_2-TPR$. Their catalytic activities for the combustion of benzene were also examined. Most of catalysts studied showed the perovskite crystalline phase with the particle size of 21~35 nm. The $LaMnO_3$ catalyst showed the highest activity and the conversion reached almost 100% at $250^{\circ}C$. The catalysts prepared by microwave-assisted process showed higher activity compared to those prepared sol-gel method. In addition, the catalytic activity was increased with an increase of calcination temperature of $LaMnO_3$-type catalyst. The TPR results on the measurement of redox property showed a good correlation with the order of catalytic activity on the benzene combustion reaction.

• Journal of the Korea Society of Computer and Information
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• v.13 no.7
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• pp.139-148
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• 2008

The sensor network is applied from the field which is various. The sensor network nodes are exchanged with mobile environment and they construct they select cluster and cluster headers. In this paper, we propose the Dynamic Prediction Clustering Algorithm use to Skyline queries attributes in direction, angel and hop. This algorithm constructs cluster in base mobile sensor node after select cluster header. Propose algorithm is based made cluster header for mobile sensor node. It "Adv" reduced the waste of energy which mobile sensor node is unnecessary. Respects clustering where is efficient according to hop count of sensor node made dynamic cluster. To extend a network life time of 2.4 times to decrease average energy consuming of sensor node. Also maintains dynamic cluster to optimize the within hop count cluster, the average energy specific consumption of node decreased 14%.