Performance Evaluation of Multicast Overlay Routing Protocols

2012 ◽  
Vol 17 (1-2) ◽  
pp. 19-31
Author(s):  
Krzysztof Stachowiak ◽  
Tytus Pawlak ◽  
Maciej Piechowiak
Keyword(s):  
Group Communication ◽  
Evaluation Criteria ◽  
Point Of View ◽  
Multicast Communication ◽  
Application Layer ◽  
Communication Structure ◽  
Resources Management ◽  
Overlay Routing ◽  
Single Link ◽  
Overlay Approach

Abstract For almost three decades the multicast communication has been a subject of a dynamic research. It came to the world of the packet switching networks rather late and still has not become a fist class citizen of the Internet, yet the demand for such services is growing and thus the relevant technologies evolve persistently providing increasing quality and availability of the means of the group communication. The overlay approach to the multicast is an application layer realization which came to life due to certain deficiencies at the lower layers. In general the gain from using multicast for group communication instead of duplicated unicast links is that we avoid sending the same data many times through a single link. Such gain may be achieved wit the use of the router level mulitcast solution. The overlay solutions tend to approach his level of efficiency with a different degree of success. Therefore one of the main characteristics that is interesting when evaluating a particular overlay protocol is how well does it achieve the aforementioned gain. There are several metrics that allow for objective comparison of protocols in this regard. However this is not the only point of view to provide a valuable evaluation of the multicast overlay solutions. One of the important aspects of the modern group communication such as the IPTV or teleconferencing is the dynamic nature of the users’ participation. A particular group may be joined and left by multiple users at a very frequent rate which is critical to the resources management as well as to maintaining the integrity of the abstract communication structure, e.g. a tree spanning all the participants. In such case two major classes of the evaluation criteria emerge: the statical and the dynamical ones. They’re both very important and interdependent, however the means to measure them may differ significantly. In this article a wide variety of the multicast overlay protocols have been analysed and two of them have been chosen to be compared. The stress of the evaluation has been put on the dynamic aspects of the multicast overlay protocols operation.

Reliability Issues of the Multicast-Based Mediacommunication

2009 ◽  
pp. 1215-1223
Author(s):  
Gábor Hosszú
Keyword(s):  
Multicast Routing ◽  
Group Communication ◽  
Multimedia Applications ◽  
Point Of View ◽  
Multicast Tree ◽  
Ip Multicast ◽  
Special Role ◽  
Application Layer ◽  
Emerging Media ◽  
Multicast Routing Protocol

The multimedia applications generally support one-tomany group communication. Multicasting decreases the communication costs for applications, which send the same data to multiple receivers. Table 1 summarizes the types of the communication among the hosts. Currently, there is an increasing need for scalable and efficient group communication. Theoretically, multicasting is optimal for such purposes. Therefore, this technology is an emerging media dissemination technology, instead of the traditional unicast communication. It has two important types: the networklevel, namely IP-multicast, and the Application-Layer, host-multicast. In the former one, the data packets are delivered by the IP protocol, from one host to many hosts that are member of a multicast group. The routers run an IP-multicast routing protocol in order to construct a multicast tree. Along this tree, the data is forwarded to each host. Special IP addresses (224.0.0.0 - 239.255.255.255 address range) are used, which do not belong to hosts, but rather define multicast channels. In the case of Application-Layer Multicast (ALM), the hosts use unicast IP delivery, and the routers do not play any special role. Reliability is one of the most important features of all multimedia applications, independently from the multicast technology in use. This requirement is especially critical in the case of multicast, where the large volume of data is to be transferred, and correction or resending of lost data is even more difficult in time. In the multicast technology, the maintenance of the group membership information is also an important question from the point of view of the robustness of the so-called multicast delivery tree. The root of the tree is the sender, the leaves are the receivers, and the intermediate nodes are the routers in case of the IP-multicast. In the following sections, the reliability properties of different multicast technologies are overviewed.

An Integrated Tourism Model based on Local Identity for Ecological, Historical, and Cultural Tourism

2018 ◽  
Vol 3 (7) ◽  
Author(s):  
Natapon Anusorntharangkul ◽  
Yanin Rugwongwan
Keyword(s):  
Environmental Design ◽  
Cultural Tourism ◽  
Marketing Strategies ◽  
Point Of View ◽  
Local Identity ◽  
Design Elements ◽  
Resources Management ◽  
The North ◽  
North Eastern

The objective of this paper is to study local identity and explore the potential for regional resources management and valuation of the historic environment a case study of the north-eastern provinces of Thailand, for guiding the tourism environmental design elements. The point of view has the goal creative integrate tourism model and product development from local identity embedded localism. This concept advocates the philosophy that tourism businesses must develop products and marketing strategies that not only address the needs of consumers but also safeguard the local identity. 

scholarly journals Status of the quality of education and accountability unit in the educational process from the point of view of the principals of Kasbah Al Mafraq schools: واقع الاستفادة من وحدة جودة التعليم والمساءلة في العملية التربوية من وجهة نظر مديري مدارس قصبة المفرق بالأردن

2020 ◽  
Vol 4 (7) ◽  
Author(s):  
Muneera Abdalkareem Alshdefat
Keyword(s):  
Evaluation Criteria ◽  
Educational Leaders ◽  
Educational Process ◽  
Point Of View ◽  
Quality Of Education ◽  
Development Methodology ◽  
Low Degree ◽  
Study Results ◽  
The Status

This Present study aimed at finding out the Status of the quality of education and accountability unit in the educational process from the point of view of the principals of Kasbah Al Mafraq schools To achieve the goal of the study, a descriptive development methodology was developed, which was developed in three areas (evaluation criteria, cooperation and coordination, feedback and incentives) (21) items, and verified their validity and stability, and then distributed to the sample of the study consisting of (167) managers and directors in schools Kasbah Mafraq. The study results showed that the degree of appreciation and the reality of Status of the quality of education and accountability unit in the educational process from the point of view of the principals of Kasbah Al Mafraq schools was at low degree The average of the tool as a whole was (2.00) with a standard deviation of (.55) and at the level of domains, All of them were rated low, with feedback and incentives having the highest average (2.09) followed by evaluation criteria (2.00) and cooperation and coordination (1.90), and the results showed that there were no statistically significant differences in The study sample of the Status of the quality of education and accountability unit in the educational process from the point of view of the principals of Kasbah Al Mafraq schools, according to gender, at the macro level of the instrument and on all dimensions. The study recommended in light of those results the necessity for that efforts should be join efforts to support and deepen the concept of quality of education and accountability, cooperation and coordination between the quality unit of education and accountability and educational leaders, and try to provide incentives and thanks to those who deserve it, to achieve the concept of guidance and support.

scholarly journals Covid-19 and Human Resource Management: a study on Moldavia, Romania

2021 ◽  
Author(s):  
Liam James
Keyword(s):  
Resource Management ◽  
Human Resources ◽  
Human Resource Management ◽  
Human Resource ◽  
Human Resources Management ◽  
Point Of View ◽  
Mental Wellbeing ◽  
Analysis Approach ◽  
Resources Management ◽  
Medical Tests

Dramatic changes due to the current COVID-19 coronavirus have unparalleled effects on businesses acrossthe globe and have deeply affected human resources management. HRM has taken the lead in handlingemployees to deal with pressures and continue to work remotely to continue its activities in a vaguecurrent and unforeseen future. However, the HRM had to contend with the pandemic lock-down dismissaland staff reduction. The paper is focused on the analysis approach used by qualitative experts. It addressesthe problems faced by HRM in Romania, identifies the human resources ramifications of the situation andidentifies solutions. It addresses the problems HRM has been facing in Romania, ascertains the effects thecrisis has on human resources, points out the strategies companies implemented, and make s suggestionsfor addressing the crisis from the point of view of HRM. Based on the results, this study recommend thefollowing: giving more consideration for worker mental wellbeing, performing medical tests during theselection process, and encouraging the sick employees to remain at home and developing crisismanagement plans.

scholarly journals Railway Transition Curves: A Review of the State-of-the-Art and Future Research

2020 ◽  
Vol 5 (5) ◽  
pp. 43 ◽  
Author(s):  
Tanita Fossli Brustad ◽  
Rune Dalmo
Keyword(s):  
Vehicle Dynamics ◽  
State Of The Art ◽  
Evaluation Criteria ◽  
Research Topic ◽  
Point Of View ◽  
Future Research ◽  
Geometric Continuity ◽  
Railway Industry ◽  
Literature Reviews ◽  
Transition Curves

Transition curves are a useful tool for lateral alignment of railway segments. Their design is important to ensure safe and comfortable travel for passengers and cargo. Well designed transition curves can lead to reduced wear of tracks and vehicles, which is beneficial from a maintenance point of view. Extensive studies have been performed through decades to find transition curves that can replace existing railway segments for the purpose of enhancing certain properties. Those studies seek to form curves that satisfy desired evaluation criteria, which are often connected to geometric continuity between the curve segments, and vehicle dynamics, to secure a smooth ride. This research topic is still ongoing and active at present. Recent results and findings are in line with the developments on the topic of vehicle dynamics and within the railway industry. For this reason it is appropriate to collect and discuss the latest work, since there are no up-to-date detailed literature reviews available. This paper explores the present state-of-the-art of railway transition curves, and identifies some of the research challenges and future research opportunities in the field.

scholarly journals Designing a model to determine the preferred Islamic contract for a bank facilities applicant

2018 ◽  
Vol 7 (2.2) ◽  
pp. 21
Author(s):  
Marzieh Jahani ◽  
Parastoo Mohammadi
Keyword(s):  
Evaluation Criteria ◽  
Industrial Sector ◽  
Point Of View ◽  
Second Phase ◽  
Optimization Approach ◽  
Compromise Solution ◽  
Decision Matrix ◽  
Analytic Hierarchy ◽  
The Cost ◽  
Hierarchy Process

This paper aims to present a model to determine the preferred Islamic contract for the bank facilities applicant in the industrial sector. For this purpose we use a consolidated method which includes the compromise solution multi-criteria optimization in the first phase, and the calculation of the cost of financing for the applicant of facilities in the second phase. Afterwards, by using the output of the both-phase, the preferred Islamic contract based on the combinational criterion has been determined for the applicant of the facilities. According to the fact that in the financing of the projects, in addition to the criteria related to the cost of financing, the qualitative criteria are also important, so both the qualitative and quantitative criteria have been considered in this research. In this study, we used four widely applied Islamic contracts (Jo’aalah Instalment sales, Hire purchase, Participation). The assessment criteria of the Islamic contracts have been extracted in the form of a questionnaire based on the previous studies and the expert’s point of view. In the first phase, the Analytic Hierarchy Process (AHP) has been used in order to determine the weights of the evaluation criteria of the Islamic contracts; and, in order to select an appropriate contract for the applicant, the compromise solution multi-criteria optimization approach (VIKOR), which is based on the decision matrix, was used. In the second phase, the cost of financing from the bank was estimated for the applicant of the facilities in the four contracts. Finally, the obtained results of the qualitative questionnaire and the cost of financing from the bank have been combined; thus, the preferred contract for the applicant of facilities has been determined based on a combinational criterion.

scholarly journals Evaluation of translation in Russian and Arabic languages

2018 ◽  
Vol 225 (1) ◽  
pp. 147-1168
Author(s):  
Lecturer Abbas Abdulameer Shahdha
Keyword(s):  
Research Evaluation ◽  
Evaluation Criteria ◽  
Point Of View ◽  
Translation Process ◽  
Important Place ◽  
Degree Of Equivalence

  The selected research (Evaluation of translation in Russian and Arabic) is the preparation of the evaluation criteria for translation, which occupies an important place in the description of the translation process, which will evaluate only the result of the process and uses this evaluation at the same time as proof of the translator's skill and success in the translation process.The translation process can be assessed in different ways, first , evaluate the degree of equivalence of translation with the original.  Second, the purpose of the evaluation may be the degree of difficulty of the issues resolved by the translator during the achievement of parity and the steps taken by the translator in resolving these issues, which indicates the translator's skill and knowledge of the language and the language transferred to it. Third, translation pros can be evaluated from the point of view of achieving the goal for which the translation text was created.

scholarly journals Nazwiska nieurzędowe mniejszości litewskiej w Polsce – dziedzictwo językowo-kulturowe pogranicza polsko-litewskiego

2019 ◽  
Vol 43 ◽  
pp. 59-80
Author(s):  
Justyna B. Walkowiak ◽  
Jowita Niewulis-Grablunas
Keyword(s):  
Cultural Heritage ◽  
Group Communication ◽  
Point Of View ◽  
The Internet ◽  
Language Of Instruction ◽  
Internet Forum ◽  
National Minorities ◽  
Over 40 Years

Unofficial surnames used by the Lithuanian minority in Poland: The linguistic and cultural heritage of the Polish-Lithuanian borderlandUnofficial surnames are rare because surnames today are generally official in character. However, in the case of Polish citizens who are Lithuanians, they are a phenomenon that has long been present, although visible mostly – and until the entry into force of the Act on National Minorities (2005) predominantly – in intra-group communication. Considering that until recently it was not possible to register the Lithuanian forms of surnames and use them officially, this anthroponymic cultural heritage has long been transmitted between generations only informally.On the basis of the analysis of approximately 330 pairs of surnames extracted from telephone directories covering the area of compact residence of the Lithuanian minority (two of them in Polish, and one – in Lithuanian), the article discusses from the socioonomastic point of view (cf. Ainiala, 2016) the phenomenon of parallel functioning among the members of the Lithuanian minority in Poland of two surname forms: an official Polish one and an unofficial Lithuanian one. The latter differs from the former graphically and morphonologically, and in almost 30 per cent of cases their match is not unambiguous (i.e. one Polish form corresponds to more than one Lithuanian form, and, conversely, one Lithuanian form – to two or even more forms in Polish). It should be emphasised that the presence of formal exponents of Lithuanianness (Lithuanian diacritics, inflectional endings, feminine suffixes) does not necessarily imply the Lithuanian etymology of the surname. The situation is additionally complicated by the fact that in everyday intra-group communication members of the Lithuanian minority in our country use not literary Lithuanian, in which they write their surnames in minority documents (such as Lithuanian minority periodicals Aušra, Suvalkietis, Šaltinis, Terra Jatwezenorum, or bilingual yearly school reports in the schools with Lithuanian as the language of instruction), but the dialect of the Dzuks, in which their surnames are pronounced.The picture is complemented by interviews conducted in early 2018 with about 40 members of this minority, and by contributions on the Internet forum of Lithuanians in Poland regarding their attitude to the official (re-)Lithuanisation of surnames. The former revealed the opinions of older respondents (over 40 years of age), and the latter – the views of younger people. Nazwiska nieurzędowe mniejszości litewskiej w Polsce – dziedzictwo językowo-kulturowe pogranicza polsko-litewskiegoNazwiska nieurzędowe spotyka się rzadko; nazwiska zwykle mają bowiem obecnie charakter oficjalny. W przypadku obywateli polskich narodowości litewskiej są one jednak zjawiskiem występującym od dawna, choć ujawniającym się głównie – a do czasu wejścia w życie „Ustawy o Mniejszościach Narodowych” (2005) przede wszystkim – w komunikacji wewnątrzgrupowej. Wobec braku (do niedawna) możliwości zalegalizowania formy litewskiej, to antroponimiczne dziedzictwo kulturowe jest zwykle przekazywane międzypokoleniowo jedynie nieformalnie.Na podstawie analizy ok. 330 par nazwisk, wyekscerpowanych z obejmujących obszar zwartego zamieszkania mniejszości litewskiej książek telefonicznych (dwóch polskich i jednej litewskojęzycznej), artykuł omawia pod kątem socjoonomastycznym (por. Ainiala, 2016) zjawisko równoległego funkcjonowania wśród członków mniejszości litewskiej w Polsce nazwisk w dwu postaciach: oficjalnej polskiej i nieoficjalnej litewskiej. Te ostatnie różnią się od oficjalnych graficznie oraz morfonologicznie, a w przypadku blisko 30% wzajemne przyporządkowanie obu grup nie jest jednoznaczne (tzn. jednej formie polskiej odpowiada więcej niż jedna litewska, bądź odwrotnie, jednej litewskiej dwie lub nawet więcej polskich). Należy podkreślić, że obecność formalnych wykładników litewskości (litewskie diakrytyki, końcówki fleksyjne, sufiksy żeńskie) nie musi implikować litewskiej etymologii nazwiska. Sytuację dodatkowo komplikuje fakt, że zamieszkujący północno-wschodni kraniec Polski członkowie mniejszości litewskiej w naszym kraju na co dzień posługują się nie literackim językiem litewskim, którym zapisują swe nazwiska w dokumentach mniejszościowych (takimi jak czasopisma mniejszości litewskiej „Aušra”, „Suvalkietis”, „Šaltinis”, „Terra Jatwezenorum”, czy dwujęzyczne świadectwa szkolne w szkołach z litewskim językiem nauczania), a gwarą dzukowską, i z reguły taką też ich nazwiska mają postać mówioną.Obrazu dopełniają przeprowadzone na początku 2018 roku wywiady z około 40 przedstawicielami tej mniejszości oraz wypowiedzi na forum Litwinów w Polsce, dotyczące ich stosunku do oficjalnej (re)lituanizacji nazwisk. Wywiady umożliwiły poznanie zdania respondentów starszych (powyżej 40. roku życia), zaś posty w Internecie – opinii osób młodszych.

scholarly journals The Criterias, indicators and levels of preparedness of primary school teachers for integrated learning

2019 ◽  
Vol 66 (3) ◽  
pp. 178-185
Author(s):  
Olena Murashchenko
Keyword(s):  
Primary School ◽  
Cognitive Activity ◽  
Evaluation Criteria ◽  
Point Of View ◽  
Diagnostic Methods ◽  
Professional Activity ◽  
Integrated Learning ◽  
School Teachers ◽  
Primary School Teachers ◽  
Scientific Results

The article presents and theoretically substantiates the criterias, indicators and levels of preparedness of primary school teachers for integrated learning as one of the leading innovative activities on the modernization of the educational system in Ukraine, analyzes different approaches to determining the components and criterias of teachers' readiness for various aspects of activity in the research of domestic and foreign scientists. Based on the analysis, the author states that there is no single approach to determining the criterias of teachers' readiness for professional activity and the tendency of most scholars to choose criterias from the point of view of motivational, personal, cognitive, activity, and reflective structural components. Due to this connection, it is proposed to distinguish axiological-motivational, personality-creative, cognitive-epistemological, operationalactivity and reflexive-evaluation criteria of the readiness of primary school teachers to integrate learning and to characterize their indicators, to identify and adapt their indicators, heuristic-search, and creative-productive levels of professional readiness. The obtained scientific results are organized into a single table "The Criterias, indicators and levels of readiness of primary school teachers for integrated learning", which visualizes the findings of the study and focuses on the certain logic of the proposed components. The author has been provided the prospect of further scientific researches in the creation of diagnostic methods for the effective evaluation of indicators of professional readiness and organization of pedagogical experiment for their implementation in the practice of postgraduate pedagogical education.

WATER RESOURCES MANAGEMENT UNDER CONDITION OF CLIMATE CLANGED AND ADAPTATION TO IT IN THE LEVEL OF WATER CONSUMERS ASSOCIATION IN CENTRAL ASIAN COUNTRIES

2018 ◽  
pp. 23-30
Author(s):  
S Khodzhaev
Keyword(s):  
Water Resources ◽  
Water Resources Management ◽  
Local Level ◽  
Integrated Water Resources Management ◽  
Point Of View ◽  
Non Profit ◽  
Resources Management ◽  
Water Users ◽  
Central Asian ◽  
Central Asian Countries

The studies noted that the transition of the water sector to a management system based on the principles of Integrated Water Resources Management (IWRM) is being implemented in all countries of Central Asia. From the point of view of water resources management in the Republics of Uzbekistan and Kazakhstan, progress in the field of IWRM has been noted and is to some extent open to reforms. In Uzbekistan, 1503 non-governmental non-profit associations of water users (WUAs) operate today to manage water relations between farms. In Kyrgyzstan, Tajikistan and Turkmenistan, the proccss of reform is sluggish, in these countries the introduction of the IWRM concept, the transition to the hydrographic management principle and the creation of the WUAs as an adequate tool for implementing IWRM at the local level are envisaged

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