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도시특성을 고려한 교통유발계수 산정에 관한 연구 : 대전시를 중심으로 In the City of Daejeon
김명수,전찬용,황현종 한밭대학교 2004 한밭대학교 논문집 Vol.21 No.-
The biggest problem in urban transport is congestion. The purpose of this study is to understand "Electronic Road Pricing System, which is one of the traffic demand control plan for relieving such a traffic congestion, and look for the plans to improve it. For this, traffic inducement coefficient was selected, which shows the regional characteristic of Daejeon through investigation on each facility. As one can see from the investigated inducement coefficient, the same type of facilities show different characteristics. Also, it is thought that per unit burden charge that has been maintained for over 20 years should be raised relevantly in consideration to inflation. Also, it is thought that several ways have to be sought for the facility owners' active participation in the traffic volume reduction program. Studies like this research would bring the following items as their effect; Relieve traffic congestion(partly) and reduce the passage time. Personal benefits following fuel cost etc. Socio-economic effect following logistics cost and environmental pollutants etc.
박종덕,심재명,김영달,전승구 大田産業大學校 1996 한밭대학교 논문집 Vol.13 No.0201
In this paper, I have studied basic theory about the operation of single phase four-quadrant converter using MOSFET and theoretical study and efficient operation domain about each mode which is the operation of DC power mode and AC power mode. Especially I have done computer simulation about harmonic problems in conversion AC power and analysed this problem through the experiment. MOSFET in the converter has been used to make switching speed so fast for the purpose of decreasing lower harmonics in PWM. On the other hand, I have studied power-regeneration by experiment to convert 60Hz AC.
코로나 플라즈마 처리에 의한 HDPE 표면의 개질에 관한 연구
최진숙,전종탁,정봉규,이근대,문명준,이종무 釜慶大學校 2001 釜慶大學校 論文集 Vol.6 No.-
We are able to generate the stable plasma in open air and nitrogen using a corona plasma treatment system(CPTS) with a high voltage. This was applied to treat the surface of rather non-polar HDPE(High Density Polyethylene) intended for the improvement of adhesion of over-coated layers such as coatings, printing inks. The surface tension of HDPE was significantly improved by the CPTS. The characteristics of surface layer were evaluated by means of contact angle measurement, ATR-FT/IR spectroscopy, and it was found that functional groups were introduced into the surface layer of the HDPE. The use of nitrogen was increased the surface tension of the HDPE from 33.8 mJ/m^2 to 66.56 mJ/m^2, and highly effective method of HDPE surface modification could be realized.
Normal Coordinate Analysis of the Argon Matrix Isolated SF_6 Molecule
Jeon, Jong-Sin,Lee, Jong-Myung 全北大學校 大學院 國語文學硏究會 1985 基礎科學 Vol.8 No.1
매트릭스에 고립된 SF_6분자의 진동수에 개스상태의 SF_6 단일분자에 비해 낮은 진동수로 이동한다. 그뿐아니라, 개스상태일때 축퇴되어있던 진동수들이 각각 몇개의 띠로 분리된다. 본 논문은 개스상태의 SF_6분자에 대한 진동수를 이론적으로 계산하였으며, 그에 따르는 진동방식도 분석하여 보았다. 매트릭스에 고립되었을때는 SF_6와 그것을 둘러싸고 있는 아르곤 원자들과의 상호작용을 고려하여 계산하였다. 개스상태일때는 하나를 제외하고 나머지가 축퇴되어 있는 여섯가지 형태의 기본 진동수를 얻었으며, 매특릭스내에서는 비축퇴된 진동수를 확인하였고, 그에 따르는 진동방식도 분석하여 보았으며 얻은 계산치와 실험치를 비교 검토하여 보았다. The vibrational frequencies of the matrix-isolated SF_6 are shifted to lower frequencies in camparison with those of the gas phase. Moreover, the vibrational frequencies of SF_6 monomer in argon matrix are shifted to lower frequencies and splitted into several bands, respectively. We have calculated the frequencies of SF_6 monomer in the gas phase and matrix-isolated one in consideration of the SF_6-argon interactions. And we have obtained six fundamental frequencies having degeneracy in the gas phase and the splitted ones of the degenerated modes in argon matrix. And then we have analysed the normal modes of SF_6 in both cases and campared with the works of others.
Ju, Myung Jong,Kim, Jae Cheon,Choi, Hyun-Jung,Choi, In Taek,Kim, Sang Gyun,Lim, Kimin,Ko, Jaejung,Lee, Jae-Joon,Jeon, In-Yup,Baek, Jong-Beom,Kim, Hwan Kyu American Chemical Society 2013 ACS NANO Vol.7 No.6
<P>Highly efficient counter electrodes (CEs) for dye-sensitized solar cells (DSSCs) were developed using thin films of scalable and high-quality, nitrogen-doped graphene nanoplatelets (NGnP), which was synthesized by a simple two-step reaction sequence. The resultant NGnP was deposited on fluorine-doped SnO<SUB>2</SUB> (FTO)/glass substrates by using electrospray (e-spray) coating, and their electrocatalytic activities were systematically evaluated for Co(bpy)<SUB>3</SUB><SUP>3+/2+</SUP> redox couple in DSSCs with an organic sensitizer. The e-sprayed NGnP thin films exhibited outstanding performances as CEs for DSSCs. The optimized NGnP electrode showed better electrochemical stability under prolonged cycling potential, and its <I>R</I><SUB>ct</SUB> at the interface of the CE/electrolyte decreased down to 1.73 Ω cm<SUP>2</SUP>, a value much lower than that of the Pt electrode (3.15 Ω cm<SUP>2</SUP>). The DSSC with the optimized NGnP–CE had a higher fill factor (FF, 74.2%) and a cell efficiency (9.05%), whereas those of the DSSC using Pt–CE were only 70.6% and 8.43%, respectively. To the best of our knowledge, the extraordinarily better current–voltage characteristics of the DSSC–NGnP outperforming the DSSC–Pt for the Co(bpy)<SUB>3</SUB><SUP>3+/2+</SUP> redox couple (in paticular, FF and short circuit current, <I>J</I><SUB>sc</SUB>) is highlighted for the first time.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2013/ancac3.2013.7.issue-6/nn4009774/production/images/medium/nn-2013-009774_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn4009774'>ACS Electronic Supporting Info</A></P>
Ju, Myung Jong,Jeon, In-Yup,Lim, Kimin,Kim, Jae Cheon,Choi, Hyun-Jung,Choi, In Taek,Eom, Yu Kyung,Kwon, Young Jin,Ko, Jaejung,Lee, Jae-Joon,Baek, Jong-Beom,Kim, Hwan Kyu The Royal Society of Chemistry 2014 ENERGY AND ENVIRONMENTAL SCIENCE Vol.7 No.3
<P>Edge-carboxylated graphene nanoplatelets (ECGnPs) were synthesized by the simple, efficient and eco-friendly ball-milling of graphite in the presence of dry ice and used as oxygen-rich metal-free counter electrodes (CEs) in organic dye-sensitized solar cells (DSSCs), for the first time. The resultant ECGnPs are soluble in many polar solvents including 2-propanol due to the polar nature of numerous carboxylic acids at edges, allowing an electrostatic spray (e-spray) to be deposited on fluorine-doped SnO<SUB>2</SUB> (FTO)/glass substrates. The ECGnP-CE exhibited profound improvements in the electrochemical stability for the Co(bpy)<SUB>3</SUB><SUP>2+/3+</SUP> redox couple compared to the platinum (Pt)-CE. The charge transfer resistance (<I>R</I><SUB>CT</SUB>), related to the interface between an electrolyte and a CE, was significantly reduced to 0.87 Ω cm<SUP>2</SUP>, much lower than those of (Pt)-CE (2.19 Ω cm<SUP>2</SUP>), PEDOT:PSS-CE (2.63 Ω cm<SUP>2</SUP>) and reduced graphene oxide (rGO)-CE (1.21 Ω cm<SUP>2</SUP>). The DSSC based on the JK-303-sensitizer and ECGnP-CE displayed a higher photovoltaic performance (FF, <I>J</I><SUB>sc</SUB>, and <I>η</I>, 74.4%, 14.07 mA cm<SUP>−2</SUP> and 9.31%) than those with the Pt-CE (71.6%, 13.69 mA cm<SUP>−2</SUP> and 8.67%), PEDOT:PSS (68.7%, 13.68 mA cm<SUP>−2</SUP> and 8.25%) and rGO-CE (72.9%, 13.88 mA cm<SUP>−2</SUP> and 8.94%).</P> <P>Graphic Abstract</P><P>Edge-carboxylated graphene nanoplatelets (ECGnPs) prepared by the dry ball-milling of graphite showed lower charge-transfer resistance (<I>R</I><SUB>CT</SUB>) and better electrochemical stability for the JK-303-based solar cell with Co(bpy)<SUB>3</SUB><SUP>2+/3+</SUP> redox couple. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3ee43732a'> </P>