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An Ostrowski Type Inequality for Weighted Mappings with Bounded Second Derivatives
Roumeliotis, J.,Cerone, P.,Dragomir, S.S. 한국산업정보응용수학회 1999 한국산업정보응용수학회 Vol.3 No.2
A weighted integral inequality of Ostrowiski type for mappings whose second derivatives are bounded is proved. The inequality is extended to account for applications in numerical integration.
Dynamic Simulation and Aircraft Level Assessment of CMC Implementation on GTF Engine
Da Mo,Ioannis Roumeliotis,Yixiong Liu,Christos Mourouzidis,Sajal Kissoon 한국항공우주학회 2023 International Journal of Aeronautical and Space Sc Vol.24 No.3
This paper dynamically simulated the geared turbofan engine with CMC turbine components, including impacts of fuel schedule, shaft inertia, volume packing, BOV schedule. Deliberated comparisons were performed between CMC engine and Inconel engine on aircraft level performance and transient behaviour. Heat load examination is included in flight mission analysis, which lays the basis on the gearbox efficiency map related to torque and rotational speed. Results indicate that IPC surge margin of the CMC case slightly fall 0.15% but maintain steady. The mitigated T4 overshooting phenomenon has offered a 30 K drop and thus extended turbine life. More importantly, Fan shaft inertia dominantly affects engine operability, whereas the blow-off air fraction severely impacts the low power setting operation. Further investigation of heat load reveals that power loss at take-off segment accounts for 1.1% of IP shaft input power, which is 3.98% higher than Inconel case. The thermal management system needs to be redesigned to absorb extra heat. On assessment of aircraft level performance, CMC engine provides superior profits in maximizing airline revenue. The predicted annual fuel cost saving is about 0.08 million dollars coming from block fuel reduction. NOx, noise and CO2 demonstrate obvious decline, approaching 5.9%, 1.0% and 4.9%, respectively.
Dragomir, S . S .,Roumeliotis, J .,Cerone, P . 호남수학회 1999 호남수학학술지 Vol.21 No.1
An inequality of Ostrowski type far twice differentiable mappings whose derivatives belong to L₁(a, b) and applications in Numerical Integration and for special means (logarithmic mean, identric mean, p-logarithmic mean etc...) are given.
Buse Constantin,Cerone Pietro,Dragomir Sever Silvestru,Roumeliotis John Korean Mathematical Society 2006 대한수학회지 Vol.43 No.5
A refinement of $Gr\ddot{u}ss$ type inequality for the Bochner integral of vector-valued functions in real or complex Hilbert spaces is given. Related results are obtained. Application for finite Fourier transforms of vector-valued functions and some particular inequalities are provided.
CERONE, P.,DRAGOMIR, S.S.,ROUMELIOTIS, J. The Honam Mathematical Society 1999 호남수학학술지 Vol.21 No.1
An inequality of Ostrowski type for twice differentiable mappings whose derivatives belong to $L_{1}(a,\;b)$ and applications in Numerical Integration and for special means (logarithmic mean, identric mean, p-logarithmic mean etc...) are given.
S. S. Dragomir,G. Hanna,J. Roumeliotis 대한수학회 2005 대한수학회보 Vol.42 No.4
A reverse of the Cauchy-Bunyakovsky-Schwarz integral inequality for complex-valued functions and applications for the finite Fourier transform are given
DRAGOMIR S. S.,HANNA G.,ROUMELIOTIS J. Korean Mathematical Society 2005 대한수학회보 Vol.42 No.4
A reverse of the Cauchy-Bunyakovsky-Schwarz integral inequality for complex-valued functions and applications for the finite Fourier transform are given.
THE USE OF LOCATION-BASED MOBILE DATA FOR EFFECTIVE DIGITAL MARKETING CAMPAIGNS
Konstantinos Fouskas,Theodoros Oikonomidis,Anna-Maria Zaroulia,Maro Vlachopoulou,Manos Roumeliotis 글로벌지식마케팅경영학회 2023 Global Marketing Conference Vol.2023 No.07
In today's fast-evolving technological environment, the growth of mobile devices has provided businesses with additional knowledge on how to effectively communicate with their targeted audience. As big data generated by mobile users has become a valuable source for improving communication, users’ location data has provided an additional parameter to take into account while trying to enhance the effectiveness of digital marketing campaigns. This paper presents a comparative study of the location-based marketing field and tools. It provides an overview of different exploitation methods of location-based mobile services and data for effective digital marketing campaigns and guidelines for future research.