• Journal of the Korean Chemical Society
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• v.51 no.4
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• pp.324-330
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• 2007

A new ion selective PVC membrane electrode is developed as a sensor for mercury(II) ions based on bis(benzoylacetone) propylenediimine (H2(BA)2PD) as an ionophore. The electrode shows good response characteristics and displays, a linear Emf vs. log[Hg2+] response over the concentration range of 1.0×10-6 to 1.0×10-1 M Hg(II) with a Nernstian slope of 29.8±0.75 mV per decade and with a detection limit of 2.2×10-7 M Hg(II) over the pH range of 2.5-11.5. Selectivity concentrations for Hg(II) relative to a number of potential interfering ions were also investigated. The sensor is highly selective for Hg(II) ions over a large number of cations with different charge. The sensor has been found to be chemically inert showing a fast response time of 60 s and was used over a period of 3 months with a good reproducibility (S = 0.27 mV). The electrode was successfully applied to determine mercury(II) in real samples with satisfactory results.

• Spatial Information Research
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• v.16 no.3
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• pp.317-330
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• 2008

In this paper, the acquisition of digital imagery and the orthoimage generation were performed to set up working process. And another purpose of this thesis is to evaluate the accuracy of orthoimage by overlapping digital topographic map and digital cadastral map on it. The digital topographic map and digital cadastral map were superimposed on the orthoimage to check the accuracy as another approach of evaluation. The RMSE is ${\pm}0.364m$ in X direction and ${\pm}0.413m$ in Y direction with digital topographical maps(1/5,000). And the RMSE is ${\pm}1.283m$ in X direction and ${\pm}1.085m$ in Y direction with digital cadastral map. It is necessary for the application of a newly developed digital aerial camera to make an exact synchronization between GPS/IMU data and image data, use a technology for setting a standard image resolution and the number of ground control points.

• Proceedings of the Korea Water Resources Association Conference
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• 2011.05a
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• pp.293-293
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• 2011

고성군의 상수도 보급률은 2008년 기준으로 61%이며, 인근지역인 통영시의 92%에 비하여 매우 낮은 실정이다. 고성군 용수공급 전망을 살펴보면 2014년 일 최대 $25,830m^3$/일의 수요가 예상되나 현재 광역상수도를 전량 수수하는 고성군의 배분량은 $20,500m^3$/일로 $5,330m^3$/일이 부족하여 용수 확보가 필요한 실정이라고 볼 수 있다. 이러한 배경을 바탕으로 본 연구에서는 고성군의 218개소 저수지중 주변의 오염요소가 적은 42개소 저수지 유역에 대해서 강우-유출모형을 모의 수행하였으며, 토양과 관련된 각종 자료와 이를 GIS기법을 이용하여 매개변수를 산정하여, 연속유출분석모형인(NWS-PC)를 통하여 42개 유역의 유입량을 모의 수행하였다. 이러한 산정된 매개변수를 통해 2006년~2009년 동안의 강우량을 토대로 유출모의를 수행하였으며, 2008년 강우량을 토대로 극한 가뭄시의 경우도 모의 수행하였다. 최악의 가뭄시 최저 강우량을 2008년으로 선정하였기에 고성군의 평균유입량은 2,866.8천$m^3$/년으로 나타났다. 1990년~2005년도 평균 농업용수 이용량은 5,879.4천$m^3$/년이며, 2006년~2007년의 평균 농업용수 이용량은 2,186.2천$m^3$/년으로 2005년 이전 농경지 면적이 50%이상 줄어듦에 따라 이용량도 줄었다. 고성군의 평균 식수량은 406.3천$m^3$/년으로 산정되었으며, 고성읍, 하이면, 마암면, 거류면에서 유입량과 농업용수 및 식수량 차이에서 부족한 현상이 나타났으나 고성군 전체 평균으로 봤을 때는 274.3천$m^3$/년의 양이 남는 것으로 나타났다. 본 연구를 통하여 고성군 지역은 대부분의 농촌지역에서 생활용수를 마을상수도나 지하수에 의존하며 생활한다. 고성군 관내 농업용 저수지 중 식수겸용 저수지로 활용함으로써 인근 마을의 생활용수를 공급하게 되면 안정적인 마을상수원확보와 이상기후에 대비한 물 부족 대책을 수립할 수 있으며, 상습가뭄지역의 물 부족 문제가 해결하는데 기초자료로 활용할 수 있다고 판단된다.

• Journal of the Korean Society for Marine Environment & Energy
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• v.15 no.4
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• pp.330-336
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• 2012

We surveyed and evaluated quantities and distribution characteristics of debris on the sea floor around active fishing grounds around the islands in the southwest coast of Korea in 2007 where the average depth is below 40m. Proper recovery gears mainly to haul the derelict fishing gears are selected considering the sea bed types of the areas. The collected debris amounts were used to estimate the total amount of the surveyed area. The number of hauls per trial times the amount of the debris was extended to whole sampling area and the weighting factor from the opinion was applied to reach the total amount of marine debris on the floor. The amount of the deposited marine debris around Wangdeung-do area is estimated as about 686 $kg/km^2$, and the cost of the collection and treatment for the deposited marine debris is estimated about 3.9 billion KRW after consideration of the proper size of the working ships, labor, transport and treatment cost.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2009.06a
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• pp.330-330
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• 2009

For the high-performance Quantum dots-Light Emitting Diodes in the near-infrared and visible spectrum, adequate electro- and hole-transporting layers are required. The operation lifetimes of typical materials used in OLEDs are very limited and degraded especially by the oxygen and humid atmosphere. In this work, NiO was selected as a possible hole-transporting layer replacing the TPD film used in QD-LEDs. About 40-nm-thick NiO films have been deposited by the rf-sputtering method on various technical substrates such as FTO/glass, ITO/glass, and ITO/PEN. For the balance of charge carriers and quenching consideration, the resistivity of the deposited NiO films was investigated controlling the oxygen in the sputtering gas. NiO films were fabricated at room temperature and about 6mTorr using pure Ar, 2.5%-, 5%-, and 10%-mixed $O_2$ in Ar respectively. We also investigated the rf-power dependence on NiO films in the range of 80 ~ 200 Watts. The resistivity of the samples was varied from highly conductive to resistive state. Also discussed are the surface roughness of NiO films to provide the smooth surface for the deposition of QDs.

• Journal of Biosystems Engineering
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• v.35 no.5
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• pp.330-335
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• 2010

Soybean (Glycine max Merr.) and corn (Zea mays L.) transplanting has increased because soybean and corn crops cultivated by the direct seeding method were often damaged by wild birds. The purpose of this study is to develop a seeder to sow soybean (Glycine max Merr.) and corn (Zea mays L.) in a plug tray. In order to find out design factors for a metering device of the seeder, metering characteristics on metering hole size and roller speed were experimentally investigated. Soybean (cv. 'Daewon') and corn (cv. 'Mibaekchal') were used as a materials for testing the seeder in this experiment. The metering hole size of roller suitable for Daewonkong and Mibaekchal was determined. Daewonkong was suitable for hole diameter of 10 mm and hole depth of 5.5 mm, and Mibaekcal was suitable for hole diameter of 9 mm and hole depth of 5.5 mm. At a brush length of 4 mm, one grain seeding rates of Daewonkong and Mibaekchal was 99% and 93% respectively. By inducing Mibaekchal to the hole by swing, one grain seeding rate of that increased from 91.9% to 97.7%. When roller speed is 4 m per minut, seeding efficiency of prototype was 110 sheets per hour.

• Korean Journal of Materials Research
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• v.13 no.7
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• pp.429-435
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• 2003

In this study the new creep test using miniaturized specimen(10${\times}$10${\times}$0.5 ㎣) was performed to evaluate the creep characteristics for degraded materials of 2.25Cr-1Mo steel. For this creep test, the artificially aged materials for 330 hrs and 1820hrs at $630^{\circ}C$ were used. The test temperatures applied for the creep deformation of miniaturized specimens was X$630^{\circ}C$ and the applied loads were between 45 kg∼80 kg. After creep test, macro- and microscopic observation were conducted by the scanning electron microscope(SEM). The creep curves depended definitely on applied load and microstructure and showed the three stages of creep behavior like uniaxial tensile creep curves. The load exponents of virgin, 330 hrs and 1820 hrs materials based on creep rate showed 14.8, 9.5 and 8.3 at $550^{\circ}C$ respectively, The 1820 hrs material showed the lowest load exponent and this behavior was also observed in the case of load exponent based on creep rupture time. In contrast to virgin material which exhibited fined dimple fractography, a lot of carbides like net structure and voids were observed on the fractography of degraded materials.

• Journal of the Institute of Electronics and Information Engineers
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• v.50 no.1
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• pp.157-165
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• 2013

In this paper, efficient digit-serial VLSI architecture for 1D (9,7) lifting-based discrete wavelet transform (DWT) filter has been proposed. The proposed architecture computes the DWT in digit basis, so that the required hardware is reduced. Also, the multiplication is replaced with the shift and add operation to minimize the hardware requirement. Bit allocation for input, output, and the internal data has been determined by analyzing the PSNR. We have carefully designed the data feedback latency not to degrade the performance in the recursive folded scheduling. The proposed digit-serial architecture requires small amount of hardware but achieve 100% of hardware utilization, so we try to optimize the tradeoffs between the hardware cost and the performance. The proposed architecture has been designed and verified by VerilogHDL and synthesized by Synopsys Design Compiler with a DongbuHitek $0.18{\mu}m$ STD cell library. The maximum operating frequency is 330MHz with 3,770 gates in equivalent two input NAND gates.

• Journal of the Institute of Electronics Engineers of Korea SC
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• v.37 no.6
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• pp.25-34
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• 2000

This paper describes design of a 250-Mbps 10-channel optical receiver array for parallel optical interconnection with the general-purpose CMOS technology The optical receiver is one of the most important building blocks to determine performance of the parallel optical interconnection system. The chip in CMOS technology makes it possible to implement the cost-effective system also. Each data channel consists of analog front-end including the integrated photo-detector and amplifier chain, digital block with D-FF and off-chip driver. In addition, the chip includes PLL (Phase-Lock Loop) for synchronous data recovery. The chip was fabricated in a 0.65-${\mu}{\textrm}{m}$ 2-poly, 2-metal CMOS technology. Power dissipation of each channel is 330㎽ for $\pm$2.5V supply.

• Journal of Sericultural and Entomological Science
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• v.41 no.1
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• pp.48-53
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• 1999

The study was carried out to investigate the effects of hydrolysis conditions such as treatment times and concentrations on the solubility of insoluble sericin using the hydrochloric acid solution. When insoluble sericin was hydrolyzed by HCl solution, the solubility was increased with the higher treatment concentration. As the results of electrophoresis of sericin powder obtained by the HCl treatment, a distinguishable band was not confirmed. Average degree of polymerizations(A.D.P.) of sericin hydrolyzed by HCl solution were about 4.2~5.9 and average molecular weights(M.W.) were about 470~670. The longer hydrolysis time reduced the whiteness of sericin powder. As the results of amino acid analysis, the amino acid compositions of the sericin powder from HCl treatment were sililar to that of insoluble sericin, but Tyr. and Arg. were not detected in the powder obtained by HCl treatment. In DSC analysis, thermal deformation and pyrolysis peak located at near 220$^{\circ}C$ and 330$^{\circ}C$.