• Journal of Electrical Engineering and Technology
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• v.9 no.2
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• pp.771-776
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• 2014

In this paper, an agile programmable chirp spread spectrum generator for wideband frequency-jamming applications from 20 MHz to 3 GHz is proposed. A frequency-mixing architecture using two voltage-controlled oscillators is used to achieve a wideband operating frequency range, and the direct digital synthesizer (DDS)-based chirping method with a two-point modulation technique is employed to provide a programmable and consistent chirp bandwidth. The proposed signal generator provides the various programmable FM signals from 20 MHz to 3 GHz with a modulation bandwidth from 0 to 400 MHz. The prototype successfully demonstrates arbitrary sequential jamming operation with a fast band-to-band hopping time of < 10 ${\mu}sec$.

• Proceedings of the KSRS Conference
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• 2003.11a
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• pp.721-723
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• 2003

Aggregation is an operation that returns a result value through a computational process on the data which satisfy a certain condition. Recently many applications use aggregation to analyze spatiotemporal data. Although spatiotemporal data change its states over time, previous aggregation works have only dealt with spatial or temporal aspect of object. In this paper we propose spatiotemporal aggregate functions that operate on spatiotemporal data. The proposed algorithms are evaluated through some implementation results. The experiment results show that the proposed aggregate functions are applicable to spatiotemporal data efficiently.

• Proceedings of the Korean Information Science Society Conference
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• 2001.10a
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• pp.79-81
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• 2001

2차원 공간데이터를 시간차원으로 확장한 데이터모델은 최상위의 TGeometry 컴포넌트를 갖는다. TGeometry 컴포넌트는 시공간에 관한 연산뿐만 아니라 다양한 연산들을 제공한다. 2차원 시공간 데이터모델에 대한 시공간 연산자를 설계하기 위하며, 공간에 대한 방법으로서 차원으로 확장된 9IM 방법을 이용하였는데, 이것은 공간 객체를 내부, 경계, 그리고 외부로 구분하고, 이것들간의 관계를 차원으로 나타내는 방법이고, 또한 시간에 대한 방법으로서, OpenGIS에서 제안한 8개의 연산들을 시간에 적용했으며, 이들 두 가지 방법을 통합하여 시공간 객체에 대한 위상관계 tContains, tWithin, tOverlaps, tlntersects, tTouches, tEquals, tDisjoint, tCrosses 연산을 설계하였으며, 실제 예를 통해 적용하였다.

• Food Engineering Progress
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• v.13 no.4
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• pp.314-319
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• 2009

Metallothioneins (MTs) are low molecular weight, cysteine-rich, and heavy metal binding proteins, which could be induced with heavy metals such as Cd, Hg, Zn and Cu in liver, kidney, and in cultured cells. By using ion exchange chromatography on DE-52, MT was purified from the serum of carp induced with cadmium in order to produce antibody against MT. Polyclonal antibody produced against purified carp MT reacted well with MT in the serum of carp induced with cadmium, whereas control serum did not. This may indicate that the polyclonal antibody against the carp MT could be used for the preparation of biosensors to detect MT in fishes like carp.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2007.11a
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• pp.425-426
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• 2007

• Journal of the Chungcheong Mathematical Society
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• v.23 no.1
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• pp.127-136
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• 2010

For the maximum partial sum of linear process generated by a doubly infinite sequence of identically distributed $\rho$-mixing random variables with mean zeros, a complete convergence is obtained under suitable conditions.

• Communications for Statistical Applications and Methods
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• v.19 no.1
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• pp.85-95
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• 2012

In this paper we define extended negative quadrant dependence which is weaker negative quadrant dependence and show conditions for having extended negative quadrant dependence property. We also derive generalized Farlie-Gumbel-Morgenstern uniform distributions that possess the extended quadrant dependence property.

• 한국약용작물학회:학술대회논문집
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• 2011.04a
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• pp.316-317
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• 2011

• 한국도로학회:학술대회논문집
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• 2009.11a
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• pp.139-143
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• 2009

• Proceedings of the Korean Information Science Society Conference
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• 2010.06a
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• pp.258-259
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• 2010