On the use of behavioral modeling within the RFIC design flow: Satellite receiver case study

In order to generate a first-time right design, system level modeling and simulation is a major step. Thus, performance evaluation of integrated wireless systems requires the development of RF behavioral models compatible with the microelectronic design tools. Firstly, this paper shows the need of such models within the RFIC Top–Down design flow. Then, behavioral modeling techniques are presented and several classical RF block models are described. Those models are used within an RFIC satellite receiver validation example and finally, several performance evaluation examples allow demonstrating the capabilities of behavioral modeling, compared to other very used modeling techniques as mathematical and baseband approaches.     

Effective adaptive transmit power allocation algorithm considering dynamic channel allocation in reuse partitioning-based OFDMA system

This paper introduces an transmit power allocation (TPA) algorithm considering dynamic channel allocation (DCA) for a reuse-partitioning- based Orthogonal frequency division multiple access (OFDMA)/FDD cellular system. The proposed reuse partitioning-based DCA algorithm guarantees quality of service (QoS) by considering fairness among mobile stations in an OFDMA/FDD system. However, to improve the SINR values for users around the cell edge and increase the overall system throughput compared with the conventional OFDMA/FDD system of frequency reuse factor (FRF) 1, an effective TPA algorithm is also combined with the proposed DCA to adjust the transmit power per user according to the average received SINR value. Simulation results show that the proposed DCA algorithm increases the sector throughput by about 25% when compared with the conventional case that do not apply the proposed DCA algorithm. When the proposed TPA is combined with the proposed DCA algorithm, a further increase in the sector throughput of about 6% is achieved than when using just the proposed DCA algorithm.     

Ultrasound-assisted lipase-catalyzed transesterification of soybean oil in organic solvent system

This work reports the transesterification of soybean oil with ethanol using two commercial immobilized lipases under the influence of ultrasound irradiation. The experiments were performed in an ultrasonic water bath, following a sequence of experimental designs to assess the effects of temperature, enzyme and water concentrations, oil to ethanol molar ratio and output irradiation power on the reaction yield. Results show that ultrasound-assisted lipase-catalyzed transesterification of soybean oil with ethanol might be a potential alternative route to conventional alkali-catalyzed method, as high reaction yields (∼90 wt.%) were obtained at mild irradiation power supply (∼100 W), and temperature (60 °C) in a relatively short reaction time, 4 h, using Lipozyme RM IM as catalyst. The repeated use of the catalyst under the optimum experimental condition resulted in a decay in both enzyme activity and product conversion after two cycles. The use of Novozym 435 led to lower conversions (about 57%) but the enzyme activity was stable after eight cycles of use, showing, however, a reduction in product conversion after the forth cycle.     

IP复用技术的研究

IP复用技术是目前SOC设计方法的关键。首先介绍了IP复用技术发展的历程以及IP采用的形式、分类，提出了IP复用的途径。比较了硬IP和软IP在SOC设计中的复用过程，并提出了一种基于移植的硬IP复用技术；最后，结合芯片开发实例，阐述了在视频增强处理芯片开发过程中所采用的IP开发和复用策略。     

CTUNING： A REUSE DISTANCE BASED CACHE PERFORMANCE TUNING TOOL

Cache performance tuning tools are conducive to develop program with good locality and fully use cache to decrease the influence caused by speed gap between processor and memory. This paper introduces the design and implementation of a cache performance tuning tool named CTuning, which employs a source level instrumentation method to gather program data access information, and uses a limited reuse distance model to analyze cache behavior. Experiments on 183.equake improve average performance more than 6% an...     

DSSA在电子战系统控制中的应用

基于构件和DSSA(Domain SpecificSoftwareArchitecture)的领域工程使软件产业化向前迈进了一大步。它实现了需求复用、设计复用和代码复用,作为一种现实有效的软件开发方法已受到各个领域的广泛重视。本文介绍了领域工程的基本概念,以及领域工程中应用系统的基本开发过程,同时探讨了电子战系统控制领域的领域特定软件架构(DSSA)及其基本构件。     

领域分析与软构件的提取

本文主要讨论了领域工程与应用系统工程之间的关系，并结合实例阐述了基于面向对象技术的领域分析方法及如何依据领域分析来抽象和提取可复用软构件的方法和步骤，从而达到提高软件的可复用性和开发效率的目的。     

Recent advances and challenges in recycling and reusing biomedical materials

Medical waste has increased in the past 3 years as a result of the coronavirus disease 2019 (COVID-19) pandemic. This condition is expected to exacerbate due to the growing healthcare markets and aging population, posing health threats to the public via environmental footprints. To alleviate these impacts, there is an urgent need for medical waste management. This article highlights the drawbacks of current disposal methods and the potential of medical waste reuse and recycling, emphasizing the processes, materials, and chemistry involved in each practice. Further discussion is provided on the chemical and mechanical recycling of plastics as the dominating material in biomedical applications, and possible strategies and challenges in recycling and reusing biomedical materials are explored in this review.     

国外城市港口景观保护性再利用探究

文章结合港口景观与港口城市发展之间的问题以及相关学科的研究成果, 对国外历史港口区景观的产生与发展、保护性再利用的措施与方法进行了梳理, 并对日本横滨21世纪未来港、伦敦码头区进行深入解析, 总结了它们在改造过程中的成败, 为我国历史港口景观改造提供理论依据和指导。     

Spatial reuse efficiency calculation for multihop wireless networks

A multihop network provides an increase in the spatial and frequency resource reuse as compared to a single-hop network. However, a precise quantification of the benefit obtained in terms of spatial reuse is still an open issue. In this paper, a mathematical analysis is carried out in order to derive the spatial reuse efficiency of a multihop wireless network. It is demonstrated through both approximate and exact analysis, that for an unbounded network, the reuse efficiency of the wireless system increases with the number of multiple hops, M  , and the spatial protection margin, Δ$\Delta$, defined around the receiver. Significantly, it has been found that even in case of an infinitely large spatial protection margin, the obtained reuse efficiency is a finite value and is limited by the number of multiple hops in the communicating link.