• Proceedings of the KIEE Conference
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• 2008.04a
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• pp.69-70
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• 2008

통합 항법 시스템 구현시 각 센서 측정치의 동기를 맞추어 칼만 필터의 상태변호를 갱신을 해야 하지만, 상용 센서를 사용 할 경우 각 센서 측정치의 출력 동기를 맞추기 어려울 뿐만 아니라, 통합 항법 컴퓨터까지의 전송 과정에서 지연시간이 생기므로 특히 고기동 항체에서는 센서측정치 비동기로 인하여 항법 성능이 저하가 커진다. 본 논문에서는 GPS/INS/Magnetic compass 통합 항번 시스템의 동기 방법을 제안한다. 이 방법은 센서 하드웨어의 변경이 필요 없이 동기를 맞출 수 있어 상용 센서를 사용하여 항법 시스템을 개발할 때 유용하게 사용 할 수 있다. 이 방법의 성능을 검증하기 위해 고속 항체의 시나리오 구성하고 모의실험을 통해 유효성을 확인 할 수 있었다.

• Analytical Science and Technology
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• v.18 no.2
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• pp.168-172
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• 2005

A comparison study of XRF and $^{31}P$-NMR method for the analysis of phosphorous in lubricating oil has been described. Pure oil and water were used for the observation of matrices effect variation by different analytical methods. Quantitative analysis was carried out by XRF and $^{31}P$-NMR using real samples. Significant difference is observed from the slopes on the calibration curves by the XRF due to the matrices (water: 124.0, oil: 276.6). While the result obtained from XRF showed a large matrix effect, the slopes obtained from $^{31}P$-NMR results of two different matrices, however, are in good agreement ranged of ${\pm}9%$ (water: 4.9, oil: 5.3).

• Korean Journal of Veterinary Research
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• v.49 no.3
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• pp.253-256
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• 2009

The aim of the present study was to determine the acute and subacute potential of trichlorfon in guppies (Poecilia reticulatus). We first defined the 24 h median tolerance limit ($TLm_{24h}$) of the fish to trichlorfon. Guppies were then treated with $TLm_{24h}$ and 1/10 $TLm_{24h}$ trichlorfon concentrations to evaluate if any histological alterations occurred. The $TLm_{24h}$ value of trichlorfon was 11 ppm. This concentration resulted in acute toxicity to the gills and kidneys with edema, hyperplasia of the gill lamellae, and vacuolated degeneration and necrosis of renal tubular cells. In the case of subacute toxicity using a 10-fold dilution of the $TLm_{24h}$ value (1.1 ppm), no behavioral changes, external lesions or histopathological changes were observed. Therefore, safe concentration of trichlorfon might be 1.1 ppm in guppy for controlling parasitic infections.

• Molecules and Cells
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• v.20 no.1
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• pp.90-96
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• 2005

A cluster of genes for ribostamycin (Rbm) biosynthesis was isolated from Streptomyces ribosidificus ATCC 21294. Sequencing of 31.892 kb of the genomic DNA of S. ribosidificus revealed 26 open reading frames (ORFs) encoding putative Rbm biosynthetic genes as well as resistance and other genes. One of ten putative Rbm biosynthetic genes, rbmA, was expressed in S. lividans TK24, and shown to encode 2-deoxy-scyllo-inosose (DOI) synthase. Acetylation of various aminoglycoside-aminocyclitol (AmAcs) by RbmI confirmed it to be an aminoglycoside 3-N-acetyltransferase. Comparison of the genetic control of ribostamycin and butirosin biosynthesis pointed to a common biosynthetic route for these compounds, despite the considerable differences between them in genetic organization.

• Journal of the Korean Solar Energy Society
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• v.26 no.2
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• pp.19-25
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• 2006

Methane hydrate, non-polluting new energy resource, satisfies requirement and considered as a precious resource that can prevent the global warming. Fortunately, there are abundant resources of methane hydrate distribute in the earth widely. Therefore, developing the techniques that can utilize these gases effectively is highly desired. The work in this paper here is to develop a skill which can transport and store methane hydrate. As a first step, the equilibrium experiment was carried out by increasing temperatures in the cell at fixed pressures. The influence of gas consumption rates under variable degree of subcooling, stirring and water injection has been investigated formation to clarify kinetic characteristics of the hydrate. The results of present investigation showed that the enhancements of the hydrate formation in terms of the gas/water ratio are closely related to operational pressure, temperature, degrees of subcooling, and water injection.

• Proceedings of the Korean Magnestics Society Conference
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• 2007.05a
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• pp.137.2-137.2
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• 2007

• Proceedings of the KIEE Conference
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• 2004.07c
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• pp.2040-2042
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• 2004

This paper presents a miniature optical system for the fluorescence detection of the patterned protein chip. The patterned protein chip was fabricated using MEMS process. The fluorescence from the patterned protein chip was measured while varying the concentration of the BSA. The fluorescence light is separated spatially from the excitation beam using mini-size prism to increase SNR (Signal-to-Noise Ratio). The combination of prism and mirrors can convert the excitation light from the laser diode to uniform illumination on the specimen. We believe that the proposed system for fluorescence detection can be applied to rea1ization of point-of-care.

• Proceedings of the KIEE Conference
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• 2004.07c
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• pp.2137-2139
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• 2004

Cancer cell lysis at pulsed DC is realized using micromachined electrodes. In this research, quantitative analyses are performed on cell lysis results. The cell volume increasing at the pulses applied are analyzed in different medium conditions on osmotic pressure and conductivity, and the cell lysis procedures are studied in detail experimentally. Phosphate buffered saline (PBS) is used as the medium. To change the conductivity of PBS, NaCl concentration of PBS is adjusted, and inositol is used with PBS to control the effects of the osmotic pressure to cell lysis performance.

• Korean Journal of Materials Research
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• v.7 no.11
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• pp.981-985
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• 1997

열증착법에 의해서 온도 85$^{\circ}C$인 glass기판 위에 CdS 박막을 제작하였다. 두께가 200nm정도로 측정된 CdS박막은 공기 중에서 온도 25$0^{\circ}C$-55$0^{\circ}C$범위에서 각각 30분간 열처리 되었으며 이들 시료에 대하여 4-point probe, XRD, SEM, UV-Spectrophotometer 및 광발광 측정으로 전기적 광학적 특성을 조사하였다. 이들의 일련의 실험값은 열처리 온도 37$0^{\circ}C$ 근처에서 구조의 변화를 보여주었는데, 열처리 온도에 대한 비저항아니 XRD, SEM 의 측정은 cubic로부터 hexagonal구조로의 변환을 나타내었다. 특히 상온에서 측정한 광발광에서 green edge emission(GEE)피이크가 2.42eV를 나타내었는데 이 때의 발광 중심은 열처리할 때 생긴 S-vacancy에 보상된 산소로 이루어진 'CdO'의 악셉터준위에 기인하는 것으로 해석되며 그 이온화 에너지는 약 0.16eV이었다.

• Proceedings of the Korean Fiber Society Conference
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• 2003.04a
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• pp.301-302
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• 2003

Recently, synthetic polymers containing units of carbohydrate derivatives with pendatnt functional groups have been much studied. The polymers should be able to be used drug carriers and scaffold for tissue engineering, because of their nontoxicity, biocompatibility, and biodegradability.$\^$1-6/ During the last three decades, various polyfunctional polymers, e.g. polyhydroxypolyamides and polyesteramides, based on carbohydrates have been reported and synthesized by condensation polymerization between sugar derivative and diamines, although it could be done via complicated reaction routes going through protecting.$\^$1-6/ (omitted)