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The Effects of Technology Gap between FDI firms and Domestic Firms on the Technology Spillovers
Chao Wu,Keunyeob Oh 충남대학교 경영경제연구소 2019 경영경제연구 Vol.41 No.2
FDI 기업의 기술파급효과에 대한 기존 연구는 일관되지 않은 결과를 보여주는데, 이는 기업의 기술 흡수 능력 차이 때문일 것으로 생각된다. 따라서 본 논문은 국내 제조업의 기업데이터를 활용하여 FDI 기술 파급효과가 기업들의 생산성에 미치는 영향이 흡수능력에 달려 있는지 연구하였다. 분석을 위해 국내 기업과 FDI 업체 간 기술격차를 흡수능력의 대리변수로 활용하였으며 다음의 결과를 얻었다. 먼저, 기술격차와 파급효과 사이의 선형 관계를 가정하고 분석하였을 경우, 흡수 능력이 약할수록 기술파급효과는 작은 것으로 나타났다. 그러나, 2차 함수 모형을 이용하여 분석한 결과, 기술 파급과 흡수능력의 상호작용 항이 총요소생산성(TFP)과 역 U-형태 관계를 갖는다는 것을 발견하였다. 따라서, 파급효과가 최대화 되기 위한 최적수준 격차라는 것이 존재할 수 있는 것으로 보인다. 이러한 결과는 FDI기업과 국내기업들의 기술격차가 너무 크거나 너무 작으면 기술 파급효과는 그리 크지 않을 것을 의미한다. The studies on the technology spillover of FDI firms show inconsistent results, which may be because of the different technology absorption capacity of enterprises. This paper used firm-level data of manufacturing industry in Korea from 2005-2014, which were derived from the Korea Information Service Financial Analysis System (KIS-FAS) database. In order to study whether the impact of FDI technology spillover on productivity depends on the absorptive capacity. Technology gap between domestic firms and FDI firms is used as a proxy variable for absorptive capacity. When we assume the linear relationship between the gap and spillovers, it appears that the weaker the absorptive capacity, the smaller the impact of FDI on technology spillovers. However, the results of the quadratic model analysis show that the interaction term of absorptive with technology spillovers have an inverted U-shape relationship to the TFP. This result seems that there could exist a certain extent appropriate level of gap. If the gap is too large or too low, technology spillover would not be quite large.
A Study on Improve Share Image of Visual Cryptography
Chao-Ming Wu,Wen-Jan Chen,Yu-Yen Shen 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
The visual cryptography is a method of encrypt secret image in to two or several share images and use the mankind's visual scheme to decipher. The sizes of the two share images produced by our method will be different. So, the transmission bandwidth and storage space needed are less than the traditional visual cryptography system. In addition the security of the data is increased.
A Novel Robust-imperceptible Watermarking Scheme
Chao-Ming Wu,Chen-Gom Wu 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
An easy spatial-domain watermark embedding scheme was proposed. The robustness is enhanced by embedding a watermark signal with large energy. The PSNR of watermarked image is low due to the high intensity of watermark signal. Using proper sort/inverse sort operations on the embedded image, a new high PSNR watermarked image can be produced and the imperceptibility requirement can be satisfied.
Research on Incentive Mechanism of Employees in Internet Enterprises
Wu Chao,Li Xinlai 한중경제문화학회 2023 한중경제문화연구 Vol.24 No.-
The Internet, as one of the most rapidly developing industries in China in recent years, has made great contributions to China’s economic development. Internet enterprises are both an important pillar of China’s current economic development, but also a great source of scientific and technological development and innovation. For Internet companies, the core of enterprise development people-oriented, talent is the foundation of enterprise development, enterprise development cannot be separated from the team, team building cannot be separated from the talent, in the final analysis, talent is the core of enterprise development. Therefore, enterprises want to develop, we must retain talent, enterprises want to retain talent, we must incentivize the enterprise staff. Incentives are vital in human resources management, and every enterprise should design a mechanism that suits its specific circumstances. The mechanism should motivate staff to make better contributions to the enterprise, thus promoting its growth and development. This paper reviews relevant domestic and foreign literature, as well as the results of a questionnaire survey of Internet enterprise employees, to study the employee incentive mechanism in Internet enterprises. The paper puts forward measures to existing problems to facilitate the better development of Internet enterprises.
Monitoring Analysis and Numerical Simulation of the Land Subsidence in Linear Engineering Areas
Chao Jia,Xiao Yang,Jing Wu,Pengpeng Ding,Chao Bian 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.7
Non-uniform land subsidence can cause subgrade deformation and threaten the safety of linear projects such as high-speed railways. The Lunan high-speed railway is taken as the research background. Combined with the hydrogeological and engineering geological conditions, the regional land subsidence is analyzed by the combined method of the differential interferometric synthetic aperture radar (D-InSAR) and small baseline subset interferometric synthetic aperture radar (SBAS-InSAR), which is verified by using precise leveling and GPS monitoring data. The accurate land subsidence analysis of large-scale linear engineering is realized. The distribution situation and change laws of land subsidence in linear engineering areas are revealed. Then, a three-dimensional coupled numerical model of land subsidence along a large-scale linear project is established by using the finite difference method. The spatial distribution characteristics of land subsidence in the linear engineering area are quantitatively analyzed and predicted. The main factors affecting land subsidence and the degree of land subsidence are discussed while keeping the pumping rate constant. The results show that: 1) The combined method of D-InSAR and SBAS-InSAR has high accuracy in the land subsidence monitoring of linear engineering. 2) There are five non-uniform settlement funnels along the Lunan high-speed railway. The groundwater over-extraction and coal mining are the main reasons for the land subsidence. 3) Realizing water source conversion and reduce groundwater exploitation are the main factors in linear engineering areas as soon as possible.
High-Performance Supercapacitor based on the NaOH Activated D-Glucose Derived Carbon
Chao Wu,Jiang Xu,Jianning Ding,Ningyi Yuan,Pengtao Yan,Ruijun Zhang,Huihan Liu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.7
In this work, a mechanism of catalytic graphitization of D-glucose derived carbon during NaOH activation process is disclosed. The catalytic graphitization is caused by sodium atom, which is produced in the reaction between NaOH and carbon. Due to the combined action of activation and catalytic graphitization resulting from the NaOH, the activated D-glucose derived carbon behaves as a hierarchical micro- and meso-porous structure and has high electrical conductivity. Electrochemical investigations demonstrate that the activated sample exhibits an outstanding rate capability (70% of capacity retention even at a scan rate of 2 V s-1) and high specific capacitance (106 F g-1) in 6 M KOH aqueous electrolyte, which makes it a promising electrode material for high-power supercapacitors.