scholarly journals Error-Free Interpolation of Parametric Surfaces

1992 ◽  
Vol 114 (3) ◽  
pp. 271-276 ◽  
Author(s):  
J. G. Gan ◽  
T. C. Woo

A Digital Differential analyzer (DDA) is a cost effective implementation for interpolating parametric curves and surfaces. However, the problems of register overflow and integer round-off have prevented it from being adopted by industry. Contrary to intuition, an increase in register capacity is shown to have no bearing on the register overflow problem. It is shown that there is a minimum number of interpolation steps Kl below which register overflow occurs. Correspondingly, it is also shown that there exists a maximum number of interpolation steps Ku above which the accumulation of integer round-off errors exceeds the acceptable limit. But, when Kl>Ku, conflict arises. A solution is given to resolve the possible conflict and to yield an error-free interpolation of curves and surfaces.

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Bentahar Attaouia ◽  
Kandouci Malika ◽  
Ghouali Samir

AbstractThis work is focused to carry out the investigation of wavelength division multiplexing (WDM) approach on free space optical (FSO) transmission systems using Erbium Ytterbium Doped Waveguide Amplifier (EYDWA) integrated as post-or pre-amplifier for extending the reach to 30 Km for the cost-effective implementation of FSO system considering weather conditions. Furthermore, the performance of proposed FSO-wavelength division multiplexing (WDM) system is also evaluated on the effect of varying the FSO range and results are reported in terms of Q factor, BER, and eye diagrams. It has been found that, under clear rain the post-amplification was performed and was able to reach transmission distance over 27 Km, whereas, the FSO distance has been limited at 19.5 Km by using pre-amplification.


2021 ◽  
Vol 13 (5) ◽  
pp. 2703
Author(s):  
Rodrigo A. Estévez ◽  
Stefan Gelcich

The United Nations calls on the international community to implement an ecosystem approach to fisheries (EAF) that considers the complex interrelationships between fisheries and marine and coastal ecosystems, including social and economic dimensions. However, countries experience significant national challenges for the application of the EAF. In this article, we used public officials’ knowledge to understand advances, gaps, and priorities for the implementation of the EAF in Chile. For this, we relied on the valuable information held by fisheries managers and government officials to support decision-making. In Chile, the EAF was established as a mandatory requirement for fisheries management in 2013. Key positive aspects include the promotion of fishers’ participation in inter-sectorial Management Committees to administrate fisheries and the regulation of bycatch and trawling on seamounts. Likewise, Scientific Committees formal roles in management allow the participation of scientists by setting catch limits for each fishery. However, important gaps were also identified. Officials highlighted serious difficulties to integrate social dimensions in fisheries management, and low effective coordination among the institutions to implement the EAF. We concluded that establishing clear protocols to systematize and generate formal instances to build upon government officials’ knowledge seems a clear and cost effective way to advance in the effective implementation of the EAF.


2003 ◽  
Vol 14 (10) ◽  
pp. 1006-1020 ◽  
Author(s):  
M. Jimenez ◽  
J.M. Llaberia ◽  
A. Fernandez

2014 ◽  
Author(s):  
J. Peter Ault ◽  
Pete Lockwood ◽  
Robert Cloutier ◽  
David Kinee

Polysiloxane coatings are the most recent high performance coatings developed to take advantage of the heat and oxidation resistant properties of silicone-based materials. Commercially available polysiloxane coatings predominately consist of organic-inorganic siloxane materials (though some pure siloxane materials are available). Recently, the US Navy has approved polysiloxane coatings as “High Durability” in their specification for exterior weather resistant coatings (MIL-PRF-24635 Type V and VI). Navy approval comes after over 20 years of industry development of polysiloxane coatings for high performance industrial and marine applications, yet issues remain with their cost-effective implementation in the Navy fleet. This paper will review experiences of the offshore and marine industry with polysiloxane coatings and provide an update on the Navy adoption of the technology.


Author(s):  
P. Sandeep ◽  
B. Sai Chakradhar ◽  
Md. Sharuque

Author(s):  
Коровіна О. В.

The advantages and principles of using the concept of Lean-production in industrial enterprises and the place of Lean-management in the overall management system are discussed in the article. Well-known principles of economical production are universal, but each organization is unique, therefore, its principles corresponding to the sphere of activity of a particular enterprise will be formed. The uniqueness of the principles is formed on the basis of creating a map of flows of values. Application of the principles and tools of Lean management at the enterprise will improve the overall management system without breaking the structure of the management model. The advantage of introducing cost effective production will be to obtain a client-centered result. For the effective implementation of the Lean concept, enterprises need to identify, educate their leaders, train them, form a team, motivate staff, and show a personal example of the benefits of using Lean tools.


A Mobile Ad-hoc Network (MANET) is a wireless network created without any static infrastructure and works in a decentralized fashion. The nodes are independent and communicated with each other by self-organizing among those nodes to provide the global network functionality. It draws more attention in recent years because of enormous applications and its cost-effective implementation. The communication among these nodes entirely depends on the routing path and battery power. Many researches have concentrated only on finding the shortest path and throughput in this area. The energy-efficient routing has a lot of scope and important factor to be considered for routing in MANET’s. In this article, the current energy-efficient routing protocols will be extensively reviewed and results tabulated. Finally, the paper proposes open areas in which the performance of the network may be improved by considering energy-efficient networks, achieving stability in the network and finding better routes.


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