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중소벤처기업의 비재무적 요인과 재무건전성 간의 관계: 기업경쟁력의 매개효과와 산업환경의 조절효과
유원종,이철규 한국중소기업학회 2018 中小企業硏究 Vol.40 No.2
중소벤처기업은 신규고용을 창출하고 효율, 혁신 및 경쟁을 제공함으로써 경제에 중요한 역할을 하지만 경영의 어려움과 재무적인 위험에 노출되어 있으며 실패의 가능성이 높다. 국가경제에서 차지하는 중요성과 높은 실패의 가능성을 감안할 때 중소벤처기업의 재무건전성에 영향을 미치는 요인에 관한 연구가 필요하다. 중소벤처기업의 재무건전성 평가에는 재무적 요인 못지않게 비재무적 요인의 역할이 중요하지만 비재무적 요인에 관한 연구는 활발하게 이루어지지 않았다. 본 연구는 경영자역량, 기업경쟁력, 산업환경이 중소벤처기업의 재무건전성에 미치는 영향에 관하여 조사하였다. 연구결과 전문성은 재무건전성에 영향을 미치지 않았으며 자금조달과 조직관리는 재무건전성에 정(+)의 영향을 미치는 것으로 나타났다. 시장성은 재무건전성에 영향을 미치지 않았으며 기술력과 마케팅은 재무건전성에 부분적으로 정(+)의 영향을 미치는 것으로 나타났다. 전문성은 기업경쟁력을 매개로 하여 재무건전성에 부(-)의 영향을 미치고 자금조달은 기업경쟁력을 매개로 하여 재무건전성에 정(+)의 영향을 미치는 것으로 나타났으며 조직관리와 재무건전성 간에는 기업경쟁력의 매개효과가 나타나지 않았다. 경영자역량과 재무건전성 간의 관계에서 산업환경의 조절효과는 부분적으로 나타났다. Small-and Medium-sized Enterprises(SMEs) are major contributors to the economy of most countries, but SMEs face managerial difficulties and financial unstability. So, it is important to identify factors that affect SMEs’ financial soundness. This study investigated relations between non-financial factors and financial soundness. The results of this study show expertise was not related to financial soundness but, financing and organization management were positively associated with financial soundness. Expertise, financing and organization management were positively associated with corporate competitiveness. Marketability was not related to financial soundness but technology and marketing was positively associated with financial soundness partially. Expertise was negatively associated with financial soundness and financing was positively associated with financial soundness mediated through corporate competitiveness, but there was no mediating effect between organization management and financial soundness. Industrial environment had moderating effect on financial soundness partially.
디지털 X-선 영상 시스템 기반 촬영조건 변화에 따른 노이즈 특성 및 2개의 필터 조합을 이용한 개선 효과 연구
유원종,강성현,이용구,이영진 대한전자공학회 2018 전자공학회논문지 Vol.55 No.1
The purpose of this study was to evaluate image performances with various kVp and mAs and to analysis improvement effect using noise filtering in digital X-ray imaging system. First of all, we evaluated noise properties using acquired X-ray images as function of kVp and mAs. Then, Wiener filter, median filter and Gaussian filter were used in acquired images and coefficient of variation (COV) was calculated. Also, we designed new filters using 2 filter combination and evaluated COV after application of these filters. According to the results, the COV results decreased when we increased kVp and mAs and Wiener filter was superior in 1 filter situation. In addition, we confirmed lowest COV result by using Wiener-Median filter in 2 filter combination situation. In conclusion, we analyzed various noise filters in digital X-ray imaging system and our results demonstrated that 2 filter combination is better than 1 filter situation. 본 연구의 목적은 디지털 X-선 영상 시스템 기반 관전압 및 관전류 변화에 따른 노이즈의 특성 및 필터링을 통한 개선 효과를 분석하는 것이다. 먼저 관전압과 관전류 변화에 따른 X-선 영상을 획득하여 노이즈 특성을 분석하였다. 이어서, 각각의 촬영 영상을 Wiener 필터, Median 필터 및 Gaussian 필터를 적용하여 coefficient of variation (COV)를 평가하였다. 또한 위의 언급한 3종류의 필터들을 2종류씩 조합한 필터도 새롭게 모델링하여 적용한 후 COV를 비교 평가하였다. 결과적으로 관전압과 관전류가 증가함에 따라 COV값이 감소되는 것을 확인할 수 있었고, 1개의 필터를 사용하였을 경우 Wiener 필터가 가장 우수한 결과값을 도출하였다. 또한, 2종류를 조합한 필터 중에서는 Wiener-Median 필터가 낮은 COV값을 얻을 수 있었다. 결론적으로, 디지털 X-선 영상 시스템에서의 다양한 필터의 특성에 관하여 분석할 수 있었고, 2종류의 필터를 조합하는 경우 노이즈 감소 효율이 향상됨을 증명하였다.
Effects of Microstructure of Ni Anode on Nanotemplate Based Low Temperature Solid Oxide Fuel Cells
유원종,Sangbong Ryu,Waqas Hassan Tanveer,Gu Young Cho,Suk Won Cha 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.21 No.11
For nano-porous anodized aluminum oxide (AAO) template based low temperature solid oxide fuel cells (LT-SOFCs), anode structure has crucial effects on electrochemical characteristics because of triple phase boundary densities and electrical connectivity of metal catalysts on porous AAO substrates. In this study, we investigated effects of fabrication processes of Ni anode for AAO template based LT-SOFCs. Ni anodes were prepared at various deposition pressure, i.e. low pressure, high pressure and low pressure–high pressure, on nano-porous AAO substrates by physical vapor deposition. Surface morphology and cross-sectional structure of various Ni anodes were systematically evaluated. Electrochemical characterizations of LTSOFCs with various anode structures were successfully conducted at 500 °C. The Ni anode prepared at low pressure showed high electrical conductivity and low catalytic activity. However, Ni anode which was fabricated at high pressure exhibited poor electrical conductivity and good catalytic activity. Bilayer Ni anode which was deposited in sequence at low pressure and high pressure presented both good electrical conductivity and good catalytic activity. The LT-SOFC with the bilayer Ni anode cell achieved the best performance, 201 mW/cm 2 at 500 °C. Electrochemical impedance spectroscopy analysis was conducted to reveal detailed behaviors of AAO based LT-SOFCs. Therefore, we successfully optimized the anode structure for high performance AAO template based LT-SOFCs.
Performance Enhancement of Thin Film LSCF Cathodes by Gold Current Collecting Layer
유원종,차석원,이예근,이윤호,조구영,박태현,Waqas Hassan Tanveer,김우성 한국정밀공학회 2016 International Journal of Precision Engineering and Vol.3 No.2
Performance improvement of a thin film lanthanum strontium cobalt iron oxide (La0.6Sr0.4Co0.8Fe0.2O1-δ, LSCF) cathode deposited by pulsed laser deposition (PLD) was achieved by utilizing a sputtered gold (Au) film as a current collecting layer. To improve low inplane electric conductivity of the porous LSCF film due to its columnar structure, fabrication of the well-connected and porous current collector is applied by sputtering. The effects of the Au current collecting layer for solid oxide fuel cells (SOFCs) with the LSCF cathode are electrochemically characterized. The cell without the current collecting layer shows 14 Ω·cm2 of ohmic resistance, while the cell with the current collecting layer exhibits 5.5 Ω·cm2 of ohmic resistance at 550 oC. In addition, the cell with the Au layer shows almost four times higher peak power density than the cell without the Au layer. Therefore, the results suggest that the puttered Au current collecting layer enables fabrication of porous LSCF cathode with enhanced electric conductivity and improves the performance of the fuel cell.