• Korean Journal of Computational Design and Engineering
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• v.3 no.1
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• pp.40-47
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• 1998

Recently, the various driving simulator have been used widely to analyze the handling performance of vehicle and to verify the motion control algorithm of vehicle. In this study, a virtual driving simulator based on the 20-DOF vehicle model is realized to estimate the handling performance and stability of a 4WS (Four-wheel-steering) and/or 4n(Four-wheel-driving) vehicle. Especially the DC motor controlled 4WS actuator is modelled in order to reflect the effect of the responsiveness of actuator on the handling performance and stability. And the realized simulator can be applied to develope a real time simulation system for designing and testing the real vehicles.

• The Transactions of the Korean Institute of Electrical Engineers C
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• v.52 no.9
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• pp.371-377
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• 2003

We perform the physical analysis such that Si/W composition ratios and phosphorus distribution change in the W/S $i_{x}$ thin films according to phosphorus concentration of polysilicon and W $F_{6}$ flow rate for the formation of WS $i_{x}$ polycide used as a gate electrode. We report that these physical characteristics have effects on the contact resistance between word line and bit line in DRAM devices. RBS measurements show that for the samples having phosphorus concentrations of 4.75 and 6.0${\times}$10$^{2-}$ atoms/㎤ in polysilicon, by applying W $F_{6}$ flow rates decreases from 4.5 to 3.5 sccm, Si/W composition ratio has increases to 2.05∼2.24 and 2.01∼2.19, respectively. SIMS analysis give that phosphorus concentration of polysilicon for both samples have decreases after annealing, but phosphorus concentration of WS $i_{x}$ thin film has increases by applying W $F_{6}$ flow rates decreases from 4.5 to 3.5 sccm. The contact resistance between word line and bit line in the sample with phosphorus concentration of 6.0 ${\times}$ 10$^{20}$ atoms/㎤ in polysilicon is lower than the sample with 4.75 ${\times}$ 10$^{20}$ atoms/㎤ After applying W $F_{6}$ flow rates decreases from 4.5 to 3.5 sccm, the contact resistance has been improved dramatically from 10.1 to 2.3 $\mu$ $\Omega$-$\textrm{cm}^2$.

• 한국경영정보학회:학술대회논문집
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• 2007.11a
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• pp.389-394
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• 2007

웹 서비스가 현재 산업에서 주요한 분산 컴퓨팅 기술로 대두되면서, 그에 따른 연구가 활발히 이루어지고 있다. 특히, 비즈니스 프로세스 관점에서 BPEL4WS (Business Process Execution Language for Web Services)와 같은 오케스트레이션의 연구가 많이 이루어지고 있다. 또한, 웹 서비스의 주요 구성 요소중에 하나인 코리오크래피에 대한 부분은 W3C (World Wide Web Consortium)에서 현재 후보 권고안 수준인 WS-CDL (Web Services Choreography Description Language) 관련 연구가 이루어지고 있다. 이런 가운데 DERI (Digital Enterprise Research Institute)에서 WSMX (Web Services Execution Environment) 기반의 시맨틱 웹 서비스 분야의 코리오 그래피 연구를 시작하였고, 코리오그래피 불일치 (Mismatch)를 개념적으로 해결하는 방안인 프로세스 미디에이션 (Process Mediation)의 연구가 있었다. 이러한 연구들을 바탕으로 서로 다른 WS-CDL 상에서 특정 참여자가 코리오그래피 미디에이션을 하기위해서 개발된 XML 언어 WS-CML (Web Services Choreography Mediation Language)을 본 논문에서 제안한다.

• IE interfaces
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• v.13 no.4
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• pp.668-679
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• 2000

Recently, due to the primary emphasis of environmental problem, the proper selection of the prevention technology systems necessary for Dioxin treatment has been one of the critical issues in the industrial sector. This paper shows how an Analytic Hierarchy Process(AHP) model can be used for assessing the performance of selected prevention technology systems: SDA/BF-SCR, SNCR-SDA/BF, SDA/BF, EP-WS-SCR, ED-WS, and EP-SCR-WS essential for Dioxin treatments. The final results show that SNCR-SDA/BF is the most attractive prevention technology system to use in an incinerator system, followed by SDA/BF-SCR, SDA/BF and EP-WS-SCR. This is consistent with the information that we found with respect to the elements that were taken into consideration. Sensitivity analysis is also provided here.

• International Journal of Oral Biology
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• v.46 no.1
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• pp.45-50
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• 2021

This study evaluated the antimicrobial activity of Endoseal TCS, an mineral trioxide aggregate-based root canal sealer, mixed with water-soluble mangostin derivatives (WsMD) of Garcinia mangostana L. (mangosteen) ethanol extract against Enterococcus faecalis and Staphylococcus aureus. The antibacterial activity of Endoseal TCS mixed with WsMD against three strains of E. faecalis and three strains of S. aureus was performed using agar diffusion test. The data showed that Endoseal TCS mixed with 0.115% WsMD had a zone of inhibition of 0.7 ± 0.2-2.4 ± 0.1 mm. The results suggest that Endoseal TCS mixed with WsMD of Garcinia mangostana L. ethanol extract is useful as a root canal sealer with antibacterial activity against E. faecalis and S. aureus.

• Journal of Ginseng Research
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• v.23 no.3 s.55
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• pp.176-181
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• 1999

The purpose of this study was to investigate the antioxidant activities of water soluble browning reaction products (WS-BRPs) isolated from korea red ginseng. Antioxidant activities of WS-BRPs were examined with the various systems. All three WS-BRPs (L, S-1 and S-2) were found to have an ability to donate hydrogen to DPPH. Especially, L was more effective than S-1, S-2. and, L as well as S-1 and S-2 was the strongest than BHT, BHA $(5{\times}10^{-4}M),\;{\alpha}-tocopherol\;(1.0{\times}10^{-4})$ and ascorbic acid $(5.7{\times}10^{-3}M)$ previously known as antioxidants. These WS-BRPs (L, S-1 and S-2) also showed a synergistic effect against antioxidative activities of these antioxidants. Moreover S-2 had the strongest activity of these three WS-BRPs to scavenge free radicals such as hydrogen peroxide $(H_2O_2)$.

• Macromolecular Research
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• v.10 no.2
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• pp.103-107
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• 2002

High purity water soluble chitosans (WsCs) were employed as a flocculant to remove heavy metal ions from wastewater of industrial plating wastewater treatment complex. Their weight average molecular weights and polydispersities were 272,000~620,000 g/mol and 1.4~1.9 range, respectively and were readily soluble in water in the pH range of 3~11. Heavy metal ions such as chromium, iron and copper were removed well by WsCs. When WsCs was blended with either sodium N, N-diethyldithiocarbamate trihydrate (SDDC$_{T}$) or sodium salicylate (SSc), the removal efficiency was further increased primarily due to the excess amount of hydrophilic sulfonic and carboxylic groups. Especially, in the case of WsCs-SSc the remaining chromium and copper concentrations were 0.1 mg/L and 9.5 mg/L, which are 1/15 and 1/3 compared with that of pure WsCs, respectively. The former is within the acceptable limit, but the latter is not. Therefore, the effective copper flocculant remains to be studied.d.

• Journal of Platform Technology
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• v.6 no.4
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• pp.26-33
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• 2018

In this paper, we propose an image retrieval algorithm for real-time processing and design it as hardware. The proposed method is based on the classification of BoWs(Bag of Words) algorithm and proposes an image search algorithm using bit stream. K-fold cross validation is used for the verification of the algorithm. Data is classified into seven classes, each class has seven images and a total of 49 images are tested. The test has two kinds of accuracy measurement and speed measurement. The accuracy of the image classification was 86.2% for the BoWs algorithm and 83.7% the proposed hardware-accelerated software implementation algorithm, and the BoWs algorithm was 2.5% higher. The image retrieval processing speed of BoWs is 7.89s and our algorithm is 1.55s. Our algorithm is 5.09 times faster than BoWs algorithm. The algorithm is largely divided into software and hardware parts. In the software structure, C-language is used. The Scale Invariant Feature Transform algorithm is used to extract feature points that are invariant to size and rotation from the image. Bit streams are generated from the extracted feature point. In the hardware architecture, the proposed image retrieval algorithm is written in Verilog HDL and designed and verified by FPGA and Design Compiler. The generated bit streams are stored, the clustering step is performed, and a searcher image databases or an input image databases are generated and matched. Using the proposed algorithm, we can improve convenience and satisfaction of the user in terms of speed if we search using database matching method which represents each object.

• Transactions of the Korean Society of Automotive Engineers
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• v.8 no.4
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• pp.130-140
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• 2000

In this paper the reference model following control(RMFC) scheme through the optimal control theory is investigated for the independent rear wheel steering(IRWS) vehicle. RMFC vehicle follows the dynamic performance of a virtual vehicle as a reference model deisgned in the controller. Linear vehicle model of two degres-of-freedom is used to derive control scheme which is applied to full vehicle for evaluating handling performances. And 4WS vehicle through RMFC is compared to the conventional 2WS vehicle and 4WS vehicle in the J-turn test. The RMFC logic is also extended to IRWS vehicle, IRWS with RMFC shows not only the excellent handling performance but salso some advantages in terms of the directional stability and responsiveness from the simulation results.

• Proceedings of the Korea Information Processing Society Conference
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• 2005.05a
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• pp.949-952
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• 2005

웹 서비스는 SOAP, WSDL, UDDI와 같은 표준을 기반으로 인터넷상의 분산된 여러 서비스들을 통합하는 가장 효과적인 방법으로 알려져 있다. 이러한 통합을 위하여 웹 서비스 표준 프로세스 통합모델 언어인 BPEL4WS가 제시되었다. 이와 같은 분산된 서비스 통합 시에 서비스 신뢰성 확보를 위해서는 각각의 웹서비스들의 품질 관리가 필요하다. 이에 본 논문에서는 각 웹 서비스들의 품질을 관리 할 수 있고, 품질을 분석하고, 분석 후에는 저 품질의 서비스는 원활한 서비스 제공을 위해 대체 하는 시스템을 제안한다. 또한 본 시스템에서 사용되는 품질 보증 정책과 저 품질 웹 서비스 교체 방법 및 전체 시스템의 프레임워크를 제안한다.