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TIPS-pentacene의 잉크젯 인쇄공정에서 액적의 수와 기판 온도에 따른 OTFTs의 전계이동도 변화
권동훈,박진석,송정근,Kwon, Dong-Hoon,Park, Jin Seok,Song, Chung-Kun 한국전기전자재료학회 2013 전기전자재료학회논문지 Vol.26 No.6
In this paper, we analyzed the effects of the number of TIPS-pentacene droplets and also the substrate temperature on the performance of OTFTs. As the number of the droplets increased, the mobility increased and reached the peak value and then reduced at the all temperatures. The peak mobility was $0.14{\pm}0.03cm^2/V{\cdot}sec$ at 3 droplets and $41^{\circ}C$, $0.19{\pm}0.02cm^2/V{\cdot}sec$ at 4 droplets and $46^{\circ}C$, and $0.35{\pm}0.10cm^2/V{\cdot}sec$ at 7 droplets and $51^{\circ}C$. The reason of existence of peak mobility can be found in matching the evaporation of solvent with the velocity of crystal formation. When two parameters were properly matched, the mobility produced the highest.
A Study on E-commerce Recommender Systems Based on LSI and Fuzzy Model
권영직,양춘우,권동훈 대구대학교 정보통신연구소 2009 情報通信硏究 Vol.6 No.1
This paper combines two analytical techniques to create a model that not only narrows product choices but also producesa prioritized product list of recommendations tailored to a specific customer. Specifically, the paper proposes to create a recommender system based on applications of Latent Semantic Indexing (LSI) and Fuzzy Synthetic Judgment (FSJ). The application ofthese two analytic models will serve a two-fold purpose. Latent Semantic Indexing will enable the model to account for incomplete rating information in the collaborative rating matrix so that the completed rating matrix can then be decomposed using the Singular Value Decomposition (SVD) method. Fuzzy Synthetic Judgment will then provide a prioritized list to the customer of recommended selections. In order to provide a clearer understanding of the proposed recommender process, the authors will demonstrate the requisite calculations through an application. In addition to clarifying the process, the example will serve to help validate the proposed model.
Floating Magnetic Membrane for Rapid Enrichment of Pathogenic Bacteria
김수현,Jeil Lee,구본한,권동훈,전상민,신용,주진명 한국바이오칩학회 2021 BioChip Journal Vol.15 No.1
Efficient separation and enrichment of pathogenic bacteria from complex matrices are crucial for the detection and downstream biomedical investigations. Herein, we report a floating magnetic membrane comprised of superparamagnetic nanoparticles and cationic polymer chains for rapid capture and enrichment of pathogenic bacteria under continuous flow. Magnetic nanoparticles combined with polymeric chains have shown affordable features to capture, release, and concentrate the pathogens by applying an external magnetic field. We have verified the modulated porous characteristics of the floating magnetic membrane depending on the molecular weight of cationic polymer chains and demonstrated rapid enrichment of pathogenic bacteria from aqueous fluid in the capillary glass tube (> 50-fold). Structural flexibility of the magnetic membrane allows the liquid and smaller species to pass through but efficiently induces binding of the bacteria on the antibodyfunctionalized magnetic nanoparticles of the floating virtual web. The magnetic membrane enables size-selective filtration and target-specific trapping through ionic exchange and immunomagnetic isolation. This study implies that spatiotemporal application of the magnetic membrane for rapid enrichment of biological targets in a large volume of continuous flow using microfluidic devices and biochips.
권영직(Young-Jik Kwon),장굉위(Hongwei Zhang),고국화(Guohua Gao),권동훈(Donghoon Kwon) 한국의사결정학회 2009 의사결정학연구 Vol.17 No.1
모든 사용자가 웹을 통하여 어려움 없이 인터넷에 접근 가능하도록 하기 위해서는, 웹사이트가 웹 접근성을 고려하여 개발되어야 한다. 이러기 위해서 본 논문에서는 웹 접근성 평가 분석도구인 A-Prompt와 KADO-WAH를 사용하여 W3C의 웹 접근성 지침(WCAG 2.0)과 한국형 웹 콘텐츠 접근성 지침(KWCAG 1.0)을 기반으로 5개의 웹 사이트를 대상으로 하여 웹 접근성을 평가한 후, 평가결과를 도출하였다. 본 논문의 연구 결과는 다음과 같다. 첫째, 두 개의 평가도구(KWDO-WAH, A-prompt)로 동일한 체크 항목을 평가한 결과 그 값이 다르게 나왔다. 둘째, 이들 두 개의 평가 도구에 있어서 통일된 평가 지침과 평가항목이 없다. 셋째, 이들 두 개의 평가 도구에 있어서 중복 체크항목은 없어야 하고, 웹 접근성 평가를 위한 필수 항목을 보완해야 한다. A web site should be developed by considering web accessibility for every user. It is due to the fact that every user should access the Internet through the web without any difficulties or challenges. For doing this, this paper derives evaluation results after evaluating web accessibility of five web sites based on WCAG 2.0 of W3c and KWCAG 1.0 by using A-Prompt and KADO-WAH which are called as a analysis tool of web accessibility evaluation. The following is our research results. First, as a result of evaluating same check lists with two evaluation tool (KWDO-WAH, A-Prompt), different value is came out. Second, there are no unified evaluation guide line and evaluation lists about these two evaluation tools. Third, duplicated check lists of these two evaluation tools should be eliminated, and it should come up with necessary lists for evaluating web accessibility.