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Performance Evaluation of an Internet Protocol Security (IPSec) Based Multiprotocol Label Switching (MPLS) Virtual Private Network

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Journal of Computer and Communications 2020年第9期8卷 100-108页

作者： conrad K. Simatimbe Smart Charles Lubobya Department of Electrical and Electronic Engineering School of Engineering The University of Zambia Lusaka Zambia

This paper evaluates the performance of Internet Protocol Security (IPSec) based Multiprotocol Label Switching (MPLS) virtual private network (VPN) in a small to medium sized organization. The demand for security in data networks has been increasing owing to the high cyber attacks and potential risks associated with networks spread over distant geographical locations. The MPLS networks ride on the public network backbone that is porous and highly susceptible to attacks and so the need for reliable security mechanisms to be part of the deployment plan. The evaluation criteria concentrated on Voice over Internet Protocol (VoIP) and Video conferencing with keen interest in jitter, end to end delivery and general data flow. This study used both structured questionnaire and observation methods. The structured questionnaire was administered to a group of 70 VPN users in a company. This provided the study with precise responses. The observation method was used in data simulations using OPNET Version 14.5 Simulation software. The results show that the IPSec features increase the size of data packets by approximately 9.98% translating into approximately 90.02% effectiveness. The tests showed that the performance metrics are all well within the recommended standards. The IPSec Based MPLS Virtual private network is more stable and secure than one without IPSec.

关键词： Multiprotocol Label Switching Internet Protocol Security Virtual Private Network Video Conferencing Voice over Internet Protocol Jitter End to End Delay

Assessment of Trends in the Development of the It Market

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Open Journal of Applied Sciences 2023年第7期13卷 1111-1118页

作者： conrad Onesime Oboulhas Tsahat Ngoulou A. Ndzeli Ecole Nationale Supérieure Polytechnique Université Marien Ngouabi Brazzaville Republic of the Congo

The demand for information technology in a new way forced us to reconsider our views on the state of the information and communication technology market. The analysis of the trend in the development of the information space is necessary for the formation of a scenario for the formation of a stable information and communication industry in the hotel state. The article proposes the structure of the IT market, defines the role of its main parts and concludes about their impact on the further development of the IT industry. A brief overview of the components of the modern IT market is presented. The greatest influence is provided by cloud solutions, the Internet of Things market and digital products in the field of artificial intelligence. Observation of changes in the IT market allows us to predict further events related to digitalization. In conclusion, possible ways of developing the IT market are given.

关键词： Information Technologies IT Market Trend Digitalization Software Products

Oncoselectivity in Oncolytic Viruses against Colorectal Cancer

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Journal of Cancer Therapy 2014年第13期5卷 1153-1174页

作者： Steven J. conrad Karim Essani Laboratory of Virology Department of Biological Sciences Western Michigan University Kalamazoo USA

In humans colorectal cancer (CRC) is a significant cause of morbidity and mortality. New treatment options are urgently needed to supplement existing therapies. Replication-competent oncolytic viruses (RCOVs) for the treatment of cancerous tumors?in vivo?is a relatively new therapeutic modality with great but largely unrealized potential against CRC. In the context of oncolytic virus safety, oncoselectivity is an important criterion. It is at the conceptual intersection of viral replication strategy and tumor cell biology that RCOVs acquire their oncoselectivity, and thus their safety. Every aspect of tumor molecular biology which distinguishes it from normal, non-neoplastic cells is a potential target for exploitation. In the first section of this review we will provide an explanation of some of the successful and widely used strategies for improving oncoselectivity in wild-type viruses to make them more suitable as RCOVs. In the second section we will describe some of the characteristics of CRC biology which can be exploited to provide oncoselectivity against CRC. Throughout the review examples of successfully-engineered RCOVs which embody the approach or strategy under discussion are noted. By showing what has been done, we hope to highlight what is possible and what remains to be done to generate oncoselective RCOVs for use against CRC in humans.

关键词： Colorectal Cancer Replication-Competent Oncolytic Virus Oncoselectivity Virotherapy

Should medium-sized contractors still implement home-made information technologies on construction sites?

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Frontiers of Engineering Management 2020年第1期7卷 142-158页

作者： conrad BOTON Eric ST-PIERRE Gabriel LEFEBVRE Department of Construction Engineering cole de Technologie SupérieureMontrealCanada

Despite the increasing dissemination of the Building Information Modeling(BIM)approach,many firms are still far from BIM and are only starting to adopt information *** conducted an ethnographic action research with an industrial partner that implements information technologies on its construction sites,with a strong preference for home-made *** show that the development of such applications faces difficulties and that multiple iterations and versions are necessary before achieving the expected goals because the required competencies are lacking among internal development ***,initial needs evolve considerably throughout the application’s development and evaluation ***,notwithstanding the difficulties encountered during the different application development phases,the industrial partner believes the decision to be worthwhile because of the desire to have internal control over the project data and the need to consider certain specificities related to business processes.

关键词： small-and medium-sized enterprises mobile computing mobile cloud computing information technology for construction construction site ethnographic action research

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BAW小型延迟线

压电与声光 1989年第2期11卷 40-42页

作者： Alan conrad 姚肃宗美.特勒达恩微波产品实验室

特勒达恩微波产品实验室研制的BAVW器件既小又轻巧,有效地取代了传统使用的大尺寸波导和同轴电缆延迟线。该BAW延迟线适用于0.2—18GHz的宽频带范围,其延迟为0.2—1.0μs。

关键词： BAW 延迟线 BAW延迟线

Mirror for Humanity.2版 2nd ed.

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间隙灌溉和控释肥施用对稻田土壤产甲烷微生物的影响

1999年

作者： conrad Phillip Kottak

来源：畅想之星图书光盘版（南... 评论

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土壤 2017年第6期49卷 1132-1139页

作者：纪洋于海洋 conrad Ralf 徐华南京信息工程大学应用气象学院南京210044 土壤与农业可持续发展国家重点实验室(中国科学院南京土壤研究所) 南京210008 Max Planck Institute for Terrestrial Microbiology Marburg 35043

间隙灌溉和控释肥施用影响稻田CH_4的产生和排放,然而其微生物机理尚不清楚。本研究通过采集稻季田间原位试验新鲜土样,采用核酸定量技术(qPCR)和末端限制性片段长度多态性(T-RFLP)技术,研究间隙灌溉和控释肥施用对稻田土壤产甲烷微生... 详细信息

间隙灌溉和控释肥施用影响稻田CH_4的产生和排放,然而其微生物机理尚不清楚。本研究通过采集稻季田间原位试验新鲜土样,采用核酸定量技术(qPCR)和末端限制性片段长度多态性(T-RFLP)技术,研究间隙灌溉和控释肥施用对稻田土壤产甲烷微生物群落丰度和结构的影响。结果表明,稻季CH_4排放量与古菌、产甲烷菌(mcr A基因)和甲烷氧化菌(pmo A基因)数量均呈极显著正相关关系(P<0.01),而与细菌数量无显著相关性。间隙灌溉显著影响产甲烷菌和甲烷氧化菌数量的季节变化,其中烤田抑制产甲烷菌生长,而对甲烷氧化菌数量没有显著影响。与尿素相比,施用控释肥增加了稻田土壤细菌、古菌和产甲烷菌数量,降低了甲烷氧化菌数量。土壤古菌群落的优势T-RFs片段为184bp和391bp,其中184bp片段的相对丰度随着间隙灌溉的进行由45%~55%降低到23%~30%;而391bp片段则相反,其相对丰度由12%~18%增加到23%~26%。典型相关性分析(CCA)表明间隙灌溉显著影响土壤古菌群落结构(P<0.001),而控释肥施用对土壤古菌群落结构没有明显影响。

关键词：间隙灌溉控释肥 CH4排放产甲烷微生物稻田

饱和黏土高压压缩特性的微观机制——研究现状与思路

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煤炭学报 2013年第2期38卷 233-238页

作者：况联飞周国庆 conrad Boley 邹亚洲商翔宇中国矿业大学深部岩土力学与地下工程国家重点实验室江苏徐州221008 慕尼黑联邦国防军大学土力学与基础工程研究所德国慕尼黑85577 中国矿业大学力学与建筑工程学院江苏徐州221008

通过归纳分析发现,适用于描述常压条件下黏土压缩特性的扩散双电层理论和不平行板模型均不能对高压条件饱和黏土的双线性压缩特性进行解释。将黏土的孔隙划分为团聚体间、颗粒间及颗粒板内三层面可很好地对饱和黏土的高压压缩过程进行... 详细信息

通过归纳分析发现,适用于描述常压条件下黏土压缩特性的扩散双电层理论和不平行板模型均不能对高压条件饱和黏土的双线性压缩特性进行解释。将黏土的孔隙划分为团聚体间、颗粒间及颗粒板内三层面可很好地对饱和黏土的高压压缩过程进行定性描述:高压条件下,除团聚体间及板间扩散双电层两部分的自由水分子的排出外,晶层间规则排列的结合水分子也将被逐层挤出。而该小间距条件下,基于扩散双电层机制的理论解释已不再适用,且由于水分子与晶层间的特殊结合,其他Non-DLVO作用力的出现亦必须重新加以考虑。基于此,提出了从理论上利用格子密度泛函理论描述黏土矿物界面外水分子的特殊结合形态,并嵌入该格子模型于分子动力模型中,从分子尺度研究高压条件下水-界面间的相互作用,从而最终建立基于分子层面黏土高压压缩本构关系的新思路。

关键词：黏土高压压缩水化斥力格子密度泛函理论分子动力模拟