• Journal of Korea Spatial Information System Society
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• v.4 no.1 s.7
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• pp.39-46
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• 2002

In distributed spatial database systems, users nay issue a query that joins two relations stored at different sites. The sheer volume and complexity of spatial data bring out expensive CPU and I/O costs during the spatial join processing. This paper shows a new spatial join method which joins two spatial relation in a parallel way. Firstly, the initial join operation is divided into two distinct ones by partitioning one of two participating relations based on the region. This two join operations are assigned to each sites and executed simultaneously. Finally, each intermediate result sets from the two join operations are merged to an ultimate result set. This method reduces the number of spatial objects participating in the spatial operations. It also reduces the scope and the number of scanning spatial indices. And it does not materialize the temporary results by implementing the join algebra operators using the iterator. The performance test shows that this join method can lead to efficient use in terms of buffer and disk by narrowing down the joining region and decreasing the number of spatial objects.

• Applied Biological Chemistry
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• v.13 no.1
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• pp.59-64
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• 1970

Human Bence Jones Protein could be purified by DEAF-Sephadex A-50 column $(2{\times}37cm)$ with 0.02M phosphate Buffer (pH 8.0) and gradient increasing with NaCl concentration as in Fig. 2-4. Sample As (K-type Bence Jones Protein) had two component, F-I was major component and its dried weight was 350mg. of starting material of 500mg. Other Sample Im and Ik (${\lambda}$-type Bence Jones Protein) was purified by DEAE-Sephadex A-50 with 0.02M phosphate Buffer(pH 8.0)too. F-I (major component) of Im and F-I of Ik were 242mg and 146mg. its dried weight respectively. K-type of Bence Jones Protein's(As, Ko, Ta.) N-terminal amino acid residue was determined by method of DNP,. K-type of Bence Jones Protein's amino acid residue were either glutamic acid or aspartic acid. Sample Ta was confirmed as glutamic acid its N-Terminal. As and Ko were aspartic acid. Each yellowish spot (DNP-amino acids) were extracted with 4ml. of pH 8.05% $NaHCO_3$ solution and calculated its recovery by O.D. $(360m{\mu}$ using the ${\varepsilon}=18.1{\times}10^3DNP$ $Asp\;{\varepsilon}=17.41{\times}10^(3)\;DNP\;Glu$ considering 50% lose during; the acid (6N-HCI) hydrolysis. Recovery of ko and As were 54.3% and 65% of its starting materials (DNP-Protein). Sample Ta's recovery was 85% of its DNP-protein. ${\lambda}$-type of Bence Jones Protein was rot investigated its N-terminal amino acid residue by DNP-method, probably it was blocked its N-terminal residue with glutamic acid.

• 한국초전도학회:학술대회논문집
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• v.9
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• pp.147-151
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• 1999

YBCO step-edge Josephson junction were fabricated on sapphire substrates. The steps were formed on R-plane sapphire substrates by using Ar ion milling with PR masks. The step angle was controlled in the wide range from 25$^{\circ}$ to 50$^{\circ}$ by adjusting both the Ar ion incident angle and the photoresist mask rotation angle relative to the incident Ar ion beam. CeO$_2$ buffer layer and in-situ YBa$_2Cu_3O_{7-{\delta}}$ (YBCO) thin films was deposited on the stepped R-plane sapphire substrates by pulsed laser deposition method. The YBCO film thickness was varied to obtain the ratio of film thickness to step height in the range from 0.5 to 1. The step edge junction exhibited RSJ-like behaviors with I$_cR_n$ product of 100 ${\sim}$ 300 ${\mu}$V, critical current density of 10$^3$ ${\sim}$ 10$^5$ A/ cm$^2$ at 77 K.

• 한국신재생에너지학회:학술대회논문집
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• 2006.06a
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• pp.222-224
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• 2006

A non-vacuum process for $Cu(In,Ga)Se_2$ (CIGS) thin film solar cells from nanoparticle precursors was described in this work CIGS nanoparticle precursors was prepared by a low temperature colloidal route by reacting the starting materials $(CuI,\;InI_3,\;GaI_3\;and\;Na_2Se)$ in organic solvents, by which fine CIGS nanoparticles of about 20nm in diameter were obtained. The nanoparticle precursors were mixed with organic binder material for the rheology of the mixture to be adjusted for the doctor blade method. After depositing the mixture of CIGS with binder on Mo/glass substrate, the samples were preheated on the hot plate in air to evaporate remaining solvents ud to burn the organic binder material. Subsequently, the resultant (porous) CIGS/Mo/glass simple was selenized in a two-zone Rapid Thermal Process (RTP) furnace in order to get a solar ceil applicable dense CIGS absorber layer. Complete solar cell structure was obtained by depositing. The other layers including CdS buffer layer, ZnO window layer and Al electrodes by conventional methods. The resultant solar cell showed a conversion efficiency of 0.5%.

• Journal of Korean Society of Forest Science
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• v.74 no.1
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• pp.29-36
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• 1986

A method isolating Populus euramericana cv. I-214 mesophyll protoplasts was developed to facilitate application of genetic engineering techniques to this species. The suitable medium for shoot multiplication in vitro was MS basal medium with $0.1mg/{\ell}$ BAP. The effects of several factors influencing protoplast isolation could be evaluated quickly by using leaf in vitro and known volumes of maceration and washing media. The best yields of mesophyll protoplasts were obtained using leaves in vitro in 2.0% Cellulase R-10, 0.8% Macerozyme R-10, 1.2% Hemicellulase, 2.0% Driselase, 0.05% Pectolyase Y-23, and O.6M Mannitol in addition to DTT and MES buffer adjusted to pH 5.6. Over $2.4{\times}10^6$ protoplasts per gram of leaf were produced using these conditions. For protoplast purification, the most favorable sucrose concentration of floating solution was 0.6M after washing them with CPW solution. This method of screening factors affecting protoplast isolation could be applicable to other species.

• Progress in Superconductivity
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• v.5 no.2
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• pp.94-97
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• 2004

Step-edge Josephson junctions (SEJ) have been fabricated on sapphire substrates with in situ deposited films of CeO$_2$ buffer layer and YBa$_2$Cu$_3$O$_{7}$ films on the low angle steps. Direct coupled SQUID magnetometers with the SEJ were formed on 1 cm X 1 cm R-plane sapphire substrates. Typical 5-${\mu}{\textrm}{m}$-wide Josephson junctions have R$_{N}$ of 3 Ω and I$_{c}$ of 50 $mutextrm{A}$ at 77 K. The direct coupled SQUID magnetometers were designed to have pickup coils of 50-${\mu}{\textrm}{m}$-wide 16 parallel loops on the 1 cm X 1 cm substrates with outer dimension of 8.8 mm X 8.8 mm. The SEJ SQUID magnetometers exhibit relatively low 1/f noise even with dc bias control, and could be stably controlled by flux-locked loops in the magnetically disturbed environment. Field noise of the do SQUID was measured to be 200∼300 fT/Hz$^{1}$2/in the white noise region and about 2 pT/Hz$^{1}$2/ at 1 Hz when measured with dc bias method.hod.d.

• 한국초전도학회:학술대회논문집
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• v.10
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• pp.155-159
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• 2000

YBCO step-edge dc SQUID magnetometers on sapphire substrates have been fabricated. CeO2 buffer layer and YBCO films were deposited in situ on the low angle (${\sim}$35$^{\circ}$) steps formed on the sapphire substrates. Typical 5-${\mu}$m-wide junction has R$_n$ of 5 ${\omega}$ and I$_c$ of 50 ${\mu}$A with large I$_c$R$_n$ product of 250 ${\mu}$V at 77K. According to applied bias current, depth of voltage modulation was changed and maximum voltage was measured 16 ${\mu}$V. Field noise of do SQUID was measured 100${\sim}$300 fT/${\surd}^{Hz}$ in the 1 $^{kHz}$, and about 1.5 pT/${\surd}^{Hz}$ in the 1/f region. For ac bias reversal method, field noise was decreased in the 1/f region. The QRS peak of magnetocardiogram was measured 50 pT in the magnetically shielded room.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.41 no.4
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• pp.41-49
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• 2004

In this paper, a design and measurement method for FPGA embedded gigabit-transceiver is presented. Altera's Stratix GX device which is general purpose transceiver called GXB was used for implementing PCI Express transceiver. PCI Express is the generation high performance serial I/O bus used to interconnect peripheral devices. After GXB was set follow by PCI Express specifications, the design has been verified by timing simulation and implemented as hardware. We tested it as follow. First GXB internal digital and analog block test second GXB transmitter signal integrity test called Eye mask test, third GXB high-speed serial I/O buffer and on-chip termination test and the last GXB protocol test. This paper shows all the design and measurement procedure about FPGA embedded gigabit-transceiver.

• Journal of Sensor Science and Technology
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• v.7 no.4
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• pp.271-278
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• 1998

A ISFET-based glucose sensor has inherent problems such as low sensitivity, drift effect and long response time. For that reason, a amperometric actuation technique was introduce to make a highly sensitivity of the ISFET glucose sensor with a Pt actuator, which electrolyzes $H_2O_2$, one of the by a by-products of the oxidation reaction of glucose. Moreover, a potential-step measurement method detecting response by only the electrolysis of $H_2O_2$ was developed for eliminating a drift problem. The operation characteristics of ISFET-based glucose sensor was improved by using the amperometric actuation and a measurement techniques. The fabricated ISFET glucose sensor is shown good operation such as characteristics(30mM PBS, about 26mV/decade) and linearity. A portable glucose meter with a highly resolution by using the fabricated ISFET-based glucose sensor with Pt actuation was developed and its characteristics investigated.

• Journal of The Korean Association of Information Education
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• v.4 no.2
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• pp.140-146
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• 2001

Scheduling strategy in the Education-on-Demand system should be designed to service the isochronous requests from several learners with single disk retrieval to improve the performance of the system. In this paper, the scheduling strategy which reduces the disk I/O and buffer consumption by utilizing the resources of the learner's system has been proposed. All the requests from the learner are not serviced from the server but forwarded to the learner's system which preserves the requested information. Therefore, the server can increase the throughput and reduces the initial latency time of the user. The proposed strategy has been compared to the conventional method by simulations and proved to be more efficient.