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Park, Sooman,Lee, Gayoung 한국전력공사 2020 KEPCO Journal on electric power and energy Vol.6 No.4
In order to identify the characteristics of fine particle emissions from thermal power plants, this study conducted measurement of the primary emission concentration of TPM, PM<sub>10</sub> and PM<sub>2.5</sub> according to Korea standard test method (ES 01301.1) and ISO 23210 method (KS I ISO 23210). Particulate matters were sampled in total 74 units of power plants such as 59 units of coal-fired power plants, 7 units of heavy oil power plants, 2 units of biomass power plant, and 6 units of liquid natural gas power plants. The average concentration of TPM, PM<sub>10</sub>, PM<sub>2.5</sub> by fuel are 3.33 mg/m<sup>3</sup>, 3.01 mg/m<sup>3</sup>, 2.70 mg/m<sup>3</sup> in coal-fired plant, 3.02 mg/m<sup>3</sup>, 2.99 mg/m<sup>3</sup>, 2.93 mg/m<sup>3</sup> in heavy oil plant, 0.114 mg/m<sup>3</sup>, 0.046 mg/m<sup>3</sup>, 0.036 mg/m<sup>3</sup> in LNG plant, respectively. These results of TPM, PM<sub>10</sub> and PM<sub>2.5</sub> were satisfied with the standards of fine dust emission allowance in all units of power plants, respectively. Also, this study evaluated the characteristics of fine particle emissions by conditions of power plants including generation sources, boiler types and operation years and calculated emission factors and then evaluated fine particle emissions by sources of electricity generation.
3-자유도 풍동실험을 통한 영각 변화에 따른 착빙 송전선로 갤러핑 발생 특성 분석
박수만(Sooman Park),송오섭(Ohseop Song) 한국소음진동공학회 2018 한국소음진동공학회 논문집 Vol.28 No.1
Transmission conductor galloping is well known as wind-induced vibration which is characterized by mainly vertical conductor oscillation, and it is usually caused by moderately strong, steady winds with asymmetric cross-sections by accreted ice and snow. It was reported that 20 galloping events per year on average have been occurred in domestic transmission lines and it would be taken consideration into one of major causes for unexpected accidents in the winter. In this test, free vibration tests for ice accreted transmission conductors with shapes of two triangles and an ellipse using wind tunnel test facility to identify and confirm attack angle ranges potentially dangerous to galloping, and 3-dof test device is used in order to do the improved simulation commensurate to the characteristics of transmission line galloping with a low frequency and a high amplitude. Galloping occurrence of ice accreted models can be identified well through the trajectory of elliptical dynamic oscillation with large vertical amplitude.
송전선로 Stockbridge Damper 진동특성 분석
박수만(Sooman Park),송오섭(Ohseop Song) 한국소음진동공학회 2018 한국소음진동공학회 논문집 Vol.28 No.4
Aeolian vibration, the cyclic conductor motions of overhead transmission lines, is wind-induced due to the shedding of vortices, and causes damages that negatively affect the service life of the overhead transmission lines. Generally, Aeolian vibration occurs in the range of 3 ㎐ ~ 150 ㎐ when the wind of 1 ㎧ ~ 7 ㎧ meets the transmission lines. Since Stockbridge dampers are used to suppress Aeolian vibrations on overhead transmission lines, it is necessary to control the vibration performance of the Stockbridge damper that absorbs energy caused by the vibration. This paper performs dynamic characteristics and harmonic response analysis of the Stockbridge damper by mass variations of metal weights and length variations of messenger cable, and presents the influence of parameters reducing the vibration analyzed for each case.
Patterned silver nanowires using the gravure printing process for flexible applications
Park, Jong Deck,Lim, Sooman,Kim, Haekyoung Elsevier 2015 THIN SOLID FILMS - Vol.586 No.-
<P><B>Abstract</B></P> <P>Gravure printing is a promising electronics printing technology for fabricating flexible-large area devices at high speeds. Ag nanowire (Ag NW)-based transparent conductive electrodes are excellent candidates for replacing indium thin oxide in flexible electronics and optical devices, which require the preparation of patterned structures. Here, the gravure printing processing parameters for applying Ag NW ink were investigated to produce large-area patterned transparent and uniform Ag NW lines on polyethylene terephthalate substrates. The ink transfer properties changed with the printing speed and pressure, as discussed, and these parameters modulated the electrical properties of the printed Ag NWs annealed at various temperatures. The importance of the rheological behavior of the ink, the printing speed, and the pressure was confirmed to understand the mechanism underlying Ag NW ink transfer. The printed line resistance for a 450μm of line width dried at 90°C was 32Ωmm<SUP>−1</SUP> with a 95% of transmittance and a 100μm gap between the printed lines. The line width and spacing of the printed patterned Ag NWs may be controlled using the parameters examined here to optimize the application-specific device performance.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Patterned Ag NW conductive lines were fabricated with the gravure printing method. </LI> <LI> The parameters for printing were investigated. </LI> <LI> The printed line width was 450μm and 100μm gap between the printed lines. </LI> <LI> The resistance was 32Ωmm<SUP>−1</SUP> and transmittance was 95%. </LI> <LI> The parameters examined here used to optimize the application-specific device performance. </LI> </UL> </P>
전력산업 RD&D 실증사례 분석을 통한 기술혁신 프레임워크 설정에 관한 연구
박수만,Park, Sooman 한국전력공사 2017 KEPCO Journal on electric power and energy Vol.3 No.1
This study aimed at proposing a RD&D good practice policy guidelines for energy technology innovation in electric power industry, we identified the success factors on energy RD&D through representative case analysis such as energy RD&D demonstration project and strategy plan, technology road map, etc. Based on a successful case study, we have identified the key elements needed to suggest when setting a RD&D technology innovation policy framework for technological competitiveness in the power industry sector. We have presented guidelines for energy technology innovation direction from the full cycle perspective of RD&D. The energy RD&D innovation system that we have established is meaningful in that the implications are derived and reflected through the case analysis of developed countries. The results of this study are as follows; Enhancement of R&D investment performance, commercialization of research achievements, promotion of export industrialization of electric power industry, establishment of RD&D governance system of power energy, etc.
박수만,Park, Sooman 한국전력공사 2016 KEPCO Journal on electric power and energy Vol.2 No.2
In recent years, the U.S, Japan, Europe and other developed countries are strategically developing technologies in order to prepare for paradigm shift affecting the electric power industry in a preemptive way. In particular, a chance for new business models and innovation in the electric power industry would rapidly increase with convergence of various technologies including Information and communication technologies. This study gathered up the theories and methodologies, and sorted out emerging technologies for the electric power industry with those theories. In order to find the emerging technologies, first, we identified the possible key issues of the electric power industry in the future using four mining techniques such as STEEP. Second, we drew agenda related with each key issue. Third, we organized candidates of the emerging technologies for solving the agenda and set the priority after evaluating the possibility of technical innovation and business. Finally, we selected the top fourteen of emerging technologies and assessed their feasibility. This study has a methodological significance because the emerging technologies were developed with a market-oriented approach rather than technical-push one that has been primarily used in another studies. The results of this study are able to be used in establishment of technology policy and R&D planning in the electric power industry.