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Academic literature on the topic 'Ndnsim'

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Published: 4 June 2021

Last updated: 1 February 2022

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Journal articles on the topic "Ndnsim"

Mastorakis, Spyridon, Alexander Afanasyev, and Lixia Zhang. "On the Evolution of ndnSIM." ACM SIGCOMM Computer Communication Review 47, no. 3 (September 6, 2017): 19–33. http://dx.doi.org/10.1145/3138808.3138812.

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Tortelli, M., G. Piro, L. A. Grieco, and G. Boggia. "On simulating Bloom filters in the ndnSIM open source simulator." Simulation Modelling Practice and Theory 52 (March 2015): 149–63. http://dx.doi.org/10.1016/j.simpat.2015.01.006.

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Eka Pratama, I. Putu Agus, and Mohammad Ernico Suryo Wicaksono. "SIMULASI NDN MENGGUNAKAN NDNSIM PADA JARINGAN INTRANET KAMPUS TEKNOLOGI INFORMASI FAKULTAS TEKNIK UNIVERSITAS UDAYANA." Jurnal RESISTOR (Rekayasa Sistem Komputer) 2, no. 2 (October 28, 2019): 136–40. http://dx.doi.org/10.31598/jurnalresistor.v2i2.330.

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NDN (Named Data Networking) is one of today's internet technologies with identifier of the packet is given in the form of a content name, not a source or destination address. Such properties make NDN have a new forwarding mechanism and different from host to host (IP-based) network architecture. Utilization of this new technology is usually incomplete or there is a need for simulations for initial testing and testing. This paper will discuss about NDN simulation. The simulation will be done using ndnSIM, an open source simulator and testing was performed at Information Technology Campus, Faculty of Engineering, Udayana University’s intranet.

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Amadeo, Marica, Claudia Campolo, Giuseppe Ruggeri, Gianmarco Lia, and Antonella Molinaro. "Caching Transient Contents in Vehicular Named Data Networking: A Performance Analysis." Sensors 20, no. 7 (April 2, 2020): 1985. http://dx.doi.org/10.3390/s20071985.

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Named Data Networking (NDN) is a promising communication paradigm for the challenging vehicular ad hoc environment. In particular, the built-in pervasive caching capability was shown to be essential for effective data delivery in presence of short-lived and intermittent connectivity. Existing studies have however not considered the fact that multiple vehicular contents can be transient, i.e., they expire after a certain time period since they were generated, the so-called FreshnessPeriod in NDN. In this paper, we study the effects of caching transient contents in Vehicular NDN and present a simple yet effective freshness-driven caching decision strategy that vehicles can implement autonomously. Performance evaluation in ndnSIM shows that the FreshnessPeriod is a crucial parameter that deeply influences the cache hit ratio and, consequently, the data dissemination performance.

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Gao, Shuai, Hongke Zhang, and Beichuan Zhang. "Energy Efficient Interest Forwarding in NDN-Based Wireless Sensor Networks." Mobile Information Systems 2016 (2016): 1–15. http://dx.doi.org/10.1155/2016/3127029.

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Recently there has been a new emerging trend in integrating Named Data Networking (NDN) and wireless sensor networks (WSNs) together to implement real data-centric Internet of Things (IoT). However, the main solutions in current literature lack energy efficient design to meet the severely limited energy resources in WSNs. In this paper, we propose a dual mode Interest forwarding scheme (called DMIF in short) for NDN-based WSNs. The DMIF consists of two combined forwarding modes, in which several energy efficient mechanisms including flexible mode shift, flooding scope control, broadcast storm avoidance, packet suppression, and energy weight factors are designed to save and balance the energy consumption. We extend the ndnSIM to support wireless multihop communication to validate the proposed scheme. Simulation experiments show that the DMIF outperforms the baseline schemes in terms of total energy consumption, energy equilibrium rate, and network lifetime.

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Bazmi, Parisa, and Manijeh Keshtgary. "A NEURAL NETWORK BASED TRAFFIC-AWARE FORWARDING STRATEGY IN NAMED DATA NETWORKING." IIUM Engineering Journal 17, no. 2 (November 30, 2016): 59–69. http://dx.doi.org/10.31436/iiumej.v17i2.617.

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Named Data Networking (NDN) is a new Internet architecture which has been proposed to eliminate TCP/IP Internet architecture restrictions. This architecture is abstracting away the notion of host and working based on naming datagrams. However, one of the major challenges of NDN is supporting QoS-aware forwarding strategy so as to forward Interest packets intelligently over multiple paths based on the current network condition. In this paper, Neural Network (NN) Based Traffic-aware Forwarding strategy (NNTF) is introduced in order to determine an optimal path for Interest forwarding. NN is embedded in NDN routers to select next hop dynamically based on the path overload probability achieved from the NN. This solution is characterized by load balancing and QoS-awareness via monitoring the available path and forwarding data on the traffic-aware shortest path. The performance of NNTF is evaluated using ndnSIM which shows the efficiency of this scheme in terms of network QoS improvementof17.5% and 72% reduction in network delay and packet drop respectively.

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Jia, Fan, and Xiaolin Zheng. "A Request-Based Handover Strategy Using NDN for 5G." Wireless Communications and Mobile Computing 2018 (August 8, 2018): 1–9. http://dx.doi.org/10.1155/2018/4513070.

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With the developing of 5G, it is widely accepted that 5G will use a system architecture that supports the ultradense networks (UDN) deployments. In this architecture, a user will be covered by a large amount of small cell base stations (SBS) in 5G. However, selecting an SBS for handover is a great challenge. To address the challenge, the emerging content-oriented Named Data Networking (NDN) has attractive advantages, such as providing name-based routing. In this paper, a request-based handover strategy (RBHS) is presented to improve the user experience in performance and obtain the optimal allocation of resources, and a caching mechanism based on the users’ requests is introduced for it. The proposed caching mechanism and access network selection mechanism were validated utilizing ndnSIM. Simulation results demonstrate that our proposed strategy achieves around 30% higher cache hit rate and 20% more traffic reduction, compared with the access network selection based on SINR.

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Hannan, Abdul, Sobia Arshad, Muhammad Azam, Jonathan Loo, Syed Ahmed, Muhammad Majeed, and Sayed Shah. "Disaster Management System Aided by Named Data Network of Things: Architecture, Design, and Analysis." Sensors 18, no. 8 (July 26, 2018): 2431. http://dx.doi.org/10.3390/s18082431.

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Disasters are the uncertain calamities which within no time can change the situation quite drastically. They not only affect the system’s infrastructure but can also put an adverse effect on human life. A large chunk of the IP-based Internet of Things (IoT) schemes tackle disasters such as fire, earthquake, and flood. Moreover, recently proposed Named Data Networking (NDN) architecture exhibited promising results for IoT as compare to IP-based approaches. Therefore to tackle disaster management system (DMS), it is needed to explore it through NDN architecture and this is the main motivation behind this work. In this research, a NDN based IoT-DMS (fire disaster) architecture is proposed, named as NDN-DISCA. In NDN-DISCA, NDN producer pushes emergency content towards nearby consumers. To provide push support, Beacon Alert Message (BAM) is created using fixed sequence number. NDN-DISCA is simulated in ndnSIM considering the disaster scenario of IoT-based smart campus (SC). From results, it is found that NDN-DISCA exhibits minimal delay and improved throughput when compared to the legacy NDN and existing PUSH schemes.

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Kuai, Meng, and Xiaoyan Hong. "Location-Based Deferred Broadcast for Ad-Hoc Named Data Networking." Future Internet 11, no. 6 (June 24, 2019): 139. http://dx.doi.org/10.3390/fi11060139.

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The emerging connected and autonomous vehicles (CAVs) challenge ad hoc wireless multi-hop communications by mobility, large-scale, new data acquisition and computing patterns. The Named Data Networking (NDN) is suitable for such vehicle ad hoc networks due to its information centric networking approach. However, flooding interest packets in ad-hoc NDN can lead to broadcast storm issue. Existing solutions will either increase the number of redundant interest packets or need a global knowledge about data producers. In this paper, a Location-Based Deferred Broadcast (LBDB) scheme is introduced to improve the efficiency and performance of interest broadcast in ad-hoc NDN. The scheme takes advantage of location information to set up timers when rebroadcasting an interest. The LBDB is implemented in V-NDN network architecture using ndnSIM simulator. Comparisons with several existing protocols are conducted in simulation. The results show that LBDB improves the overhead, the average number of hops and delay while maintaining an average satisfaction ratio when compared with several other broadcast schemes. The improvement can help offer timely data acquisition for quick responses in emergent CAV application situations.

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Hu, Qing, Chengming Li, Touhidul Hasan, Chengjun Li, and Qingshan Jiang. "A collaborative caching strategy in contentcentric networking." MATEC Web of Conferences 189 (2018): 03018. http://dx.doi.org/10.1051/matecconf/201818903018.

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Content-centric Networking (CCN) is one of the most promising network architectures for the future Internet. In-network caching is an attractive feature of CCN, however, the existing research does not consider the off-path nodes, or gives a large communication overhead for cooperation, which makes the caching utilization lower, and hard to achieve comprehensive performance optimization. To reduce the data redundancy and improve the caching utilization, we propose a Regional Hashing Collaborative Caching Strategy (RHCCS). According to calculate the importance of nodes in the network topology, we divide the network into the core area and edge area. In core area, we select the relevant nodes for cooperation, store the block in the off-path nodes with the hashing algorithm, and add a new table in original data structures for routing in the collaborative areas. As for edge area, we deploy the on-path reversion scheme. By simulating in ndnSIM and comparing with the basic caching strategy in CCN, experimental results indicate that the RHCCS can effectively reduce data redundancy, routing hops, requesting delay, and significantly increase the hit rate.

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Dissertations / Theses on the topic "Ndnsim"

Aguiari, Davide. "Named Data Networking in IoT based sensor devices." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/13297/.

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In a world running on a “smart” vision, the Internet of Things (IoT) progress is going faster than ever. The term “things” is not just about computer, people and smartphone, but also sensors, refrigerators, vehicles, clothing, food and so on. Internet of Things is the possibility to provide an IP address for every item, so it will have an interface on the Internet network. The household devices will not just being commanded and monitored remotely then, but they will have an active main character role, establishing a communication network between them. The thesis will begin describing a general overview, the state of art, of the IoT world and of sensors networks, checking its potential and any restrictions, if present. Then, every engineering aspect of the realized project, will been described in detail. This thesis will also prove that nowadays we have the right items and components for the realization of reliable low-cost sensors. The ultimate purpose is to verify the introduction of new network protocols like NDN (Named Data Networking) to evaluate their performances and efficiency. Finally I will propose the simulations output obtained by NS3 (Network Simulator): a scenario simulation using NDNSim and ChronoSync application will be present.

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Sadek, Ahmed. "Forwarding Strategies in Information Centric Networking." Thesis, KTH, Skolan för elektro- och systemteknik (EES), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-194247.

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The Internet of the 21th century is a different version from the original Internet. The Internet is becoming more and more a huge distribution network for large quantities of data (Photos, Music, and Video) with different types of connections and needs. TCP/IP the work horse for the Internet was intended as a vehicle to transport best effort Connection oriented data where the main focus is about transporting data from point A to point B regardless of the type of data or the nature of path. Information Centric Networking (ICN) is a new paradigm shift in a networking where the focus in networking is shifted from the host address to the content name. The current TCP/IP model for transporting data depends on establishing an end to end connection between client and server. However, in ICN, the client requests the data by name and the request is handled by the network without the need to go each time to a fixed server address as each node in the network can serve data. ICN works on a hop by hop basis where each node have visibility over the content requested enabling it to take more sophisticated decisions in comparison to TCP/IP where the forwarding node take decisions based on the source and destination IP addresses. ICN have different implementations projects with different visions and one of those projects is Named Data Networking (NDN) and that’s what we use for our work. NDN/ICN architecture consists of different layers and one of those layers is the Forwarding Strategy (FS) layer which is responsible for deciding how to forward the coming request/response. In this thesis we implement and simulate three Forwarding Strategies (Best Face Selection, Round Robin, and Weighted Round Robin) and investigate how they can adapt to changes in link bandwidth with variable traffic rate. We performed a number of simulations using the ndnSIMv2.1 simulator. We concluded that Weighted Round Robin offers high throughput and reliability in comparison to the other two strategies. Also, the three strategies offer better reliability than using a single static face and offer lower cost than using the broadcast strategy. We also concluded that there is a need for a dynamic congestion control algorithm that takes into consideration the dynamic nature of ICN.
2000-talets Internet är en annan version av det ursprungliga Internet. Internet blir mer och mer ett stort distributionsnät för stora mängder data (foton, musik och video) med olika typer av anslutningar och behov. TCP / IP är arbetshäst för Internet var tänkt som ett fordon för att transportera best effort Anslutning orienterade uppgifter där huvudfokus handlar om att transportera data från punkt A till punkt B, oavsett vilken typ av data eller vilken typ av väg. Information Centric Nätverk (ICN) är ett nytt paradigmskifte inom nätverk där fokus i nätverket flyttas från värdadressen till innehållets namn. Den aktuella TCP / IP-modellen för transport av data beror på att etablera en anslutning mellan klient och server (s.k. end-to-end). I ICN begär klienten data med namn och begäran hanteras av nätverket utan att behöva gå till en fix serveradress eftersom varje nod i nätverket kan besvara en begäran med data. ICN arbetar på en ”hop by hop” basis där varje nod har överblick över det begärda innehållet, vilket gör det möjligt att ta mer avancerade beslut i jämförelse med TCP / IP, där den vidarebefordrande nodens beslut fattas baserat på källans och destinationens IP-adresser. Det finns olika implementeringar av ICN med olika visioner och en av dessa implementeringar heter Named Data Networking (NDN) och det är vad vi använder för vårt arbete. NDNs / ICNs arkitektur består av olika lager och ett av dessa lager är Forwarding Strategies (FS) där vi definierar de åtgärder vi vidtar på varje begäran / svar. I detta projekt implementeras och simuleras tre Forwarding strategier (Best Face Selection, Round Robin, och Weighted Round Robin) och undersöks hur de kan anpassa sig till förändringar i länkbandbredd med konstant och variabel trafikhastigheten. Vi utfört ett antal simuleringar med hjälp av ndnSIMv2.1 simulatorn. Vi drog slutsatsen att Weighted Round Robin erbjuder hög genomströmning och tillförlitlighet i jämförelse med de två andra strategierna. De tre strategierna erbjuder även högre tillförlitlighet än att använda ett enda statiskt interface och erbjuder lägre kostnad än att använda broadcast strategin. Vi konstaterade också att det finns ett behov av en dynamisk ”congestion control”-algoritm som tar hänsyn till ICNs dynamiska karaktär.

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Peraccini, Simone. "Named Data Networking for Computing in the Mobile Edge." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/17059/.

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Oggi connettersi a Internet è una pratica di uso comune, destinata a crescere notevolmente con l'avvento dell'Internet of Things. Nonostante il grande successo, Internet presenta diversi limiti architetturali che lo rendono un veicolo povero in confronto alla grande mole di contenuti trasmessi. La seconda importante limitazione riguarda la sicurezza che è applicata solamente a livello di host ma non di contenuto. Per promuovere la prototipizzazione di nuovi paradigmi architetturali, nel 2010 la National Science Fondation crea il programma Future Internet Architecture. Tra i progetti nati, il più emergente è Named Data Networking(NDN). Il suo intento è quello di distogliere l'attenzione da "dove" trovare una risorsa per concentrarsi su "cosa" applicazioni e utenti cerchino. Per questo NDN pensa che l'identificazione non debba più riguardare gli host ma i contenuti. Quest'ultimi sono distinti da un nome univoco, godono di immutabilità e racchiudono la strategia di sicurezza. L'obiettivo di questo progetto è quello di dare un piccolo contributo a Named Data Networking, ideando e sviluppando un protocollo di computazione cooperativa, che operi per mezzo del protocollo NDN. L'intento del protocollo è quello di permettere a generici dispositivi wifi di assegnare l'esecuzione di alcuni dei loro task ad un nodo nelle vicinanze. Inoltre, la tesi accenna come il protocollo si inserisca nel tema dell'Edge computing, che assieme al Fog computing pone le basi per l'evoluzione dell'architettura Cloud. Il lavoro ha portato alla realizzazione di un prototipo del protocollo che è possibile installare sui nodi del simulatore di reti ndnSIM. Esso soddisfa i comportamenti base richiesti ed offre buone prestazioni negli scenari statici. L'elaborato si conclude con alcuni test che ne confermano il corretto funzionamento ma allo stesso tempo denotano alcuni aspetti da migliorare negli sviluppi futuri.

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Margotta, Fabrizio. "DoS and DDoS attacks in Named Data Networking." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21855/.

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La nascita di Internet ha portato benefici senza precedenti in termini sociali ed economici. Le tecnologie e i protocolli inizialmente adottati andavano a risolvere i problemi causati dall’inaffidabilità della preesistente linea telefonica e nel corso dei vari decenni hanno garantito il funzionamento delle comunicazioni globali. Tuttavia ci si pone delle domande sulla necessità di un nuovo cambio di paradigma che risponda alle nuove esigenze riscontrate nell’evoluzione di Internet stesso e dei servizi offerti. Named Data Networking, come progetto della famiglia delle Future Internet Architectures, propone una visione di Internet rinnovata in cui l’entità fondamentale scambiata è il Nome. L’attenzione viene posta sul cosa i nodi richiedono alla rete e non sul dove reperiscono le informazioni. Come nuova architettura, NDN propone approcci innovativi sui fronti dell’inoltro e dell’instradamento dei pacchetti nella rete e garantisce l’implementazione di diversi aspetti di sicurezza by design. Ciò non è però sufficiente a proteggere da tutte le minacce della rete, tra cui gli attacchi DDoS che costituiscono ancora oggi un rischio importante per i fornitori di servizi in Internet. Sono quindi necessari ulteriori sforzi per partorire un’architettura che risponda a requisiti di efficienza e sicurezza.

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Beirne, Eamonn Daniel. "Magnetic properties of the intermetallic compounds PrNiSn and NdNiSn." Thesis, University College London (University of London), 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.401264.

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Vizcaychipi, Cristiane Carneiro. "Tradução e validação transcultural do questionário da NDNQI® RN Survey with Job Satisfaction Scales-R." Universidade do Vale do Rio dos Sinos, 2016. http://www.repositorio.jesuita.org.br/handle/UNISINOS/6313.

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Submitted by JOSIANE SANTOS DE OLIVEIRA (josianeso) on 2017-05-30T12:55:43Z No. of bitstreams: 1 Cristiane Carneiro Vizcaychipi_.pdf: 1784932 bytes, checksum: 612d97e57384664002ca4213f0b98181 (MD5)
Made available in DSpace on 2017-05-30T12:55:43Z (GMT). No. of bitstreams: 1 Cristiane Carneiro Vizcaychipi_.pdf: 1784932 bytes, checksum: 612d97e57384664002ca4213f0b98181 (MD5) Previous issue date: 2016-09-30
Hospital Moinhos de Vento
Este artigo teve como objetivo realizar a tradução e adaptação transcultural de um questionário do National Database of Nursing Quality Indicators® (NDNQI®), o RN Survey with Job Satisfaction Scales-R, que avalia a satisfação dos enfermeiros a fim de apontar intervenções necessárias para desenvolver e manter os talentos da enfermagem. Os hospitais que possuem a designação Magnet® apresentam uma relação favorável com o cliente (no que se refere à relação enfermeiro-paciente), reconhecendo que o profissional enfermeiro é o ponto chave para se alcançar um cuidado de excelência. Tornando importante a autonomia dos enfermeiros e o controle sobre o seu ambiente de trabalho, através do conhecimento técnico e uma boa relação com a equipe médica, contribuindo assim, para um ambiente favorável à prática profissional no qual resulta em profissionais mais satisfeitos e um cuidado com maior qualidade e segurança. (CLARKE; SLOANE; AIKEN, 2002). Método: O questionário é composto por 27 itens, nas quais as escalas de Classificação de Satisfação no Trabalho da Base de dados nacional de indicadores de qualidade de enfermagem (NDNQI), base de dados americana, incluem as seguintes subescalas: Tarefa, Interações Enfermeiro-Enfermeiro, Interações Enfermeiro-Médico, Tomada de Decisões, Autonomia, Status Profissional, Salário, Gerenciamento de Enfermeiros, Administração de Enfermagem, Oportunidade de Desenvolvimento Profissional e Acesso ao Desenvolvimento Profissional. Para o procedimento metodológico de adaptação foram seguidas as etapas de: tradução; retrotradução; avaliação das equivalências semântica, idiomática e cultural por um grupo de juízes que sugeriram alterações na maioria dos itens a fim de assegurar essas equivalências e pré-teste com 30 sujeitos. Participaram do estudo 135 enfermeiros. Resultado: A consistência interna do questionário foi calculada pelos coeficientes de Alfa de Cronbach e o ajuste de um modelo de Equações estruturais, juntamente com a validação discriminante e a validação convergente da escala que foram avaliadas e tiveram seus resultados obtidos através do software IBM SPSS v.23 e IBM AMOS v.23. Os valores de Alpha de Cronbach foram de 0,860, sendo considerado satisfatório e o Teste de Esfericidade de Bartlett foi significativo (p-valor <0,001). Conclusão: Foram seguidas as etapas recomendadas na literatura e, todas essas etapas foram concluídas com sucesso. Suas sucessivas avaliações propiciaram que a equivalência entre a versão traduzida para a língua portuguesa do Brasil e a versão original, fosse assegurada. Como existe uma escassez de instrumentos que avaliem a satisfação do enfermeiro em seu ambiente de trabalho, no Brasil, a adaptação do “ RN Survey with Job Satisfaction Scale-R” e a validação das subescalas, para a cultura brasileira, contribui para determinar a presença de características do ambiente de trabalho do enfermeiro o qual interferem no exercício da sua prática profissional.
This paper aims to translate and cross-culturally adapt a National Database of Nursing Quality Indicators® (NDNQI®) questionnaire, RN Survey with Job Satisfaction Scales-R, which assess nurses satisfaction to develop and maintain nursing talents. Magnet® Hospitals have a favorable relationship with the client (regarding the nurse-patient relationship), recognizing that the nurse professional is the key point to reach an excellence care. Making nurses autonomous and controlling their work environment through technical knowledge and a good relationship with the medical team, thus contributing to an environment conducive to professional practice in which it results in satisfied professionals as well as a higher quality and safety standards. (CLARKE; SLOANE; AIKEN, 2002). Method: instrument consists of 27 items in which the satisfaction rating scales in the national database working nursing quality indicators (NDNQI) American database, include the following subscales: Task, nurse-nurse interactions, Nurse-Physician Interactions, socket Decisions, Autonomy, professional status, salary, Nursing Management, Nursing Management, Professional Development Opportunity and Access to Professional Development. For the methodological procedure of adaptation were followed the steps of translation; back translation; evaluation of semantic, idiomatic and cultural by a group of judges who suggested changes in most of the items to ensure these equivalences and pre-test with 30 subjects. The study included 135 nurses. Results: The internal consistency of the questionnaire was calculated by Cronbach's alpha coefficients and setting a model of structural equations, together with the discriminant validity and convergent validity of the scale were evaluated and had their results through IBM SPSS v .23 and IBM AMOS v.23. The Cronbach's alpha values were 0.860, and is considered satisfactory and the sphericity of Barttlet test was significant (p <0.001). Conclusion: the recommended steps were followed in the literature and all of these steps have been successfully completed. His successive evaluations have provided that equivalence between the translated version into Portuguese of Brazil and the original version was assured. As there is a lack of tools to assess nurses' satisfaction in their work environment in Brazil, the adaptation of "RN Survey with Job Satisfaction Scale-R" and the validation of the subscales for the Brazilian culture, contributes to determine the presence of nursing work environment characteristics, which interfere with the exercise of their professional practice.

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Arnold, Long Mary Caroleen. "Building Expert Consensus on Including Indicators of Moisture-Associated Skin Damagein The National Database of Nursing Quality Indicators (NDNQI)." Otterbein University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=otbn1461076119.

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Pell, David Andrew. "Statistical models for estimating the intake of nutrients and foods from complex survey data." Thesis, University of Cambridge, 2019. https://www.repository.cam.ac.uk/handle/1810/286334.

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Background: The consequences of poor nutrition are well known and of wide concern. Governments and public health agencies utilise food and diet surveillance data to make decisions that lead to improvements in nutrition. These surveys often utilise complex sample designs for efficient data collection. There are several challenges in the statistical analysis of dietary intake data collected using complex survey designs, which have not been fully addressed by current methods. Firstly, the shape of the distribution of intake can be highly skewed due to the presence of outlier observations and a large proportion of zero observations arising from the inability of the food diary to capture consumption within the period of observation. Secondly, dietary data is subject to variability arising from day-to-day individual variation in food consumption and measurement error, to be accounted for in the estimation procedure for correct inferences. Thirdly, the complex sample design needs to be incorporated into the estimation procedure to allow extrapolation of results into the target population. This thesis aims to develop novel statistical methods to address these challenges, applied to the analysis of iron intake data from the UK National Diet and Nutrition Survey Rolling Programme (NDNS RP) and UK national prescription data of iron deficiency medication. Methods: 1) To assess the nutritional status of particular population groups a two-part model with a generalised gamma (GG) distribution was developed for intakes that show high frequencies of zero observations. The two-part model accommodated the sources of data variation of dietary intake with a random intercept in each component, which could be correlated to allow a correlation between the probability of consuming and the amount consumed. 2) To identify population groups at risk of low nutrient intakes, a linear quantile mixed-effects model was developed to model quantiles of the distribution of intake as a function of explanatory variables. The proposed approach was illustrated by comparing the quantiles of iron intake with Lower Reference Nutrient Intakes (LRNI) recommendations using NDNS RP. This thesis extended the estimation procedures of both the two-part model with GG distribution and the linear quantile mixed-effects model to incorporate the complex sample design in three steps: the likelihood function was multiplied by the sample weightings; bootstrap methods for the estimation of the variance and finally, the variance estimation of the model parameters was stratified by the survey strata. 3) To evaluate the allocation of resources to alleviate nutritional deficiencies, a quantile linear mixed-effects model was used to analyse the distribution of expenditure on iron deficiency medication across health boards in the UK. Expenditure is likely to depend on the iron status of the region; therefore, for a fair comparison among health boards, iron status was estimated using the method developed in objective 2) and used in the specification of the median amount spent. Each health board is formed by a set of general practices (GPs), therefore, a random intercept was used to induce correlation between expenditure from two GPs from the same health board. Finally, the approaches in objectives 1) and 2) were compared with the traditional approach based on weighted linear regression modelling used in the NDNS RP reports. All analyses were implemented using SAS and R. Results: The two-part model with GG distribution fitted to amount of iron consumed from selected episodically food, showed that females tended to have greater odds of consuming iron from foods but consumed smaller amounts. As age groups increased, consumption tended to increase relative to the reference group though odds of consumption varied. Iron consumption also appeared to be dependent on National Statistics Socio-Economic Classification (NSSEC) group with lower social groups consuming less, in general. The quantiles of iron intake estimated using the linear quantile mixed-effects model showed that more than 25% of females aged 11-50y are below the LRNI, and that 11-18y girls are the group at highest of deficiency in the UK. Predictions of spending on iron medication in the UK based on the linear quantile mixed-effects model showed areas of higher iron intake resulted in lower spending on treating iron deficiency. In a geographical display of expenditure, Northern Ireland featured the lowest amount spent. Comparing the results from the methods proposed here showed that using the traditional approach based on weighted regression analysis could result in spurious associations. Discussion: This thesis developed novel approaches to the analysis of dietary complex survey data to address three important objectives of diet surveillance, namely the mean estimation of food intake by population groups, identification of groups at high risk of nutrient deficiency and allocation of resources to alleviate nutrient deficiencies. The methods provided models of good fit to dietary data, accounted for the sources of data variability and extended the estimation procedures to incorporate the complex sample survey design. The use of a GG distribution for modelling intake is an important improvement over existing methods, as it includes many distributions with different shapes and its domain takes non-negative values. The two-part model accommodated the sources of data variation of dietary intake with a random intercept in each component, which could be correlated to allow a correlation between the probability of consuming and the amount consumed. This also improves existing approaches that assume a zero correlation. The linear quantile mixed-effects model utilises the asymmetric Laplace distribution which can also accommodate many different distributional shapes, and likelihood-based estimation is robust to model misspecification. This method is an important improvement over existing methods used in nutritional research as it explicitly models the quantiles in terms of explanatory variables using a novel quantile regression model with random effects. The application of these models to UK national data confirmed the association of poorer diets and lower social class, identified the group of 11-50y females as a group at high risk of iron deficiency, and highlighted Northern Ireland as the region with the lowest expenditure on iron prescriptions.

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Books on the topic "Ndnsim"

Isis, Montalvo, Dunton Nancy, and National Center for Nursing Quality (American Nurses Association), eds. NDNQI case studies in nursing quality improvement. Silver Spring, Md: American Nurses Association, 2011.

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Cruse, Thomas A. Non-deterministic, non-traditional methods (NDNTM): [final report]. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 2001.

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Naumann, Helmut. Malte-Studien: Ansa tze zu einem neuen Versta ndnis Rilkes. 3rd ed. Rheinfelden: Scha uble, 1985.

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Dunton, Nancy. Sustained improvement in nursing quality: Hospital performance on NDNQI indicators, 2007-2008. Edited by American Nurses Association. Silver Spring, Md: American Nurses Association, 2009.

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Schmitt, Maria C. Peter Weiss: "Die A sthetik des Widerstands" : Studien zu Kontext, Struktur und Kunstversta ndnis. 2nd ed. St. Ingbert: Ro hrig Verlag, 1990.

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Walter, Krämer. Lexikon der populären Irrtümer: 500 kapitale Missverständnisse, Vorurteile und Denkfehler von Abendrot bis Zeppelin. 3rd ed. Frankfurt am Main: Eichborn, 1996.

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Gardner, Sebastian. Irrationality and the philosophy of psychoanalysis. Cambridge: Cambridge University Press, 1993.

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Buss, David M. Evolutiona re Psychologie. 2nd ed. Mu nchen [u.a.]: Pearson-Studium, 2004.

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The end of the American century. Lanham, Md: Rowman & Littlefield Publishers, 2008.

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Book chapters on the topic "Ndnsim"

"Grundlagen zum Verst�ndnis der Krankheit." In Multiple Sklerose und Familie, 1–10. Basel: KARGER, 2002. http://dx.doi.org/10.1159/000066897.

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"Current dietary patterns in the UK." In Oxford Handbook of Nutrition and Dietetics, edited by Joan Webster-Gandy, Angela Madden, and Michelle Holdsworth, 29–32. Oxford University Press, 2011. http://dx.doi.org/10.1093/med/9780199585823.003.0003.

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Current dietary patterns 30 Information on current dietary patterns in the UK is taken from the National Diet and Nutrition Survey (NDNS). NDNS is a rolling programme commissioned by PHE and FSA, and surveys people aged 1.5 years and older living in private households. Combined intakes in 2009 and 2011–2012 for adults aged 19–64 years (conducted between February 2008 and June 2009) and the 2000/01 survey are reported as appropriate....

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"Empﬁ ndnis and Self-Inﬂ icted Pain in Performance Art." In Representations of Pain in Art and Visual Culture, 53–65. Routledge, 2013. http://dx.doi.org/10.4324/9780203095331-10.

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Lopez, Jameson D. "American Indian Access to Higher Education: Where are All the NDNs?" In Advances in Research on Teaching, 41–60. Emerald Publishing Limited, 2017. http://dx.doi.org/10.1108/s1479-368720150000029006.

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Conference papers on the topic "Ndnsim"

Kato, Toshihiko, Ngo Quang Minh, Ryo Yamamoto, and Satoshi Ohzahata. "How to Implement NDN MANET over ndnSIM Simulator." In 2018 IEEE 4th International Conference on Computer and Communications (ICCC). IEEE, 2018. http://dx.doi.org/10.1109/compcomm.2018.8780792.

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Ananthakrishnan, S., Mohit P. Tahiliani, Deepaknath Tandur, and Hariram Satheesh. "Group based Publisher-Subscriber Communication Primitives for ndnSIM." In 2020 IEEE International Conference on Advanced Networks and Telecommunications Systems (ANTS). IEEE, 2020. http://dx.doi.org/10.1109/ants50601.2020.9342837.

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Pandey, Suman, Yang-Sae Moon, and Mi-Jung Choi. "Feasibility study for simulating community based content caching on CCN network using ndnSIM simulator." In 2017 19th Asia-Pacific Network Operations and Management Symposium (APNOMS). IEEE, 2017. http://dx.doi.org/10.1109/apnoms.2017.8094127.

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Rotinsulu, Marion Renaldo, Bambang Susilo, Alfan Presekal, Edi Pramono, and Riri Fitri Sari. "Measuring Quality of Services (QoS) of several forwarding strategies on Named Data Networking(NDN) using ndnSIM." In 2017 IEEE International Conference on Cybernetics and Computational Intelligence (CyberneticsCom). IEEE, 2017. http://dx.doi.org/10.1109/cyberneticscom.2017.8311713.

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Araújo, Francisco R. C., Antonio M. de Sousa, and Leobino N. Sampaio. "Armazenamento Oportunista em Redes de Dados Nomeados Sem Fio como Suporte à Mobilidade de Produtores." In Simpósio Brasileiro de Redes de Computadores e Sistemas Distribuídos. Sociedade Brasileira de Computação - SBC, 2018. http://dx.doi.org/10.5753/sbrc.2018.2462.

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As Redes Centradas na Informação foram propostas na perspectiva de atender as novas demandas de tráfego da Internet, dentre suas várias abordagens as Redes de Dados Nomeados (NDN) são as mais investigadas e, embora suporte a mobilidade dos consumidores, a mobilidade dos produtores ainda representa um desafio, dado o custo de atualização das rotas nos nós e, ainda mais crítico, os períodos de ausência do produtor. Nesse contexto, este trabalho propõe minimizar os efeitos da mobilidade de produtores em NDN, através de uma estratégia de encaminhamento de interesses e uma política de substituição de cache para os nós da rede sem fio. A solução foi implementada no simulador ndnSIM, e os resultados mostram ganhos de até 35,32% na taxa de satisfação de interesses com redução de tempo de 56,23% comparada á NDN padrão.

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Pires, Stéfani Silva, Francisco Renato Cavalcante Araújo, Allan Edgard Silva Freitas, and Leobino Nascimento Sampaio. "Análise de Perfis de Usuários de Música e Seus Impactos no Desempenho de Políticas de Substituição de Cache." In XXXVII Simpósio Brasileiro de Redes de Computadores e Sistemas Distribuídos. Sociedade Brasileira de Computação - SBC, 2019. http://dx.doi.org/10.5753/sbrc.2019.7407.

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A exploração de padrões do comportamento humano é tema central e norteador no desenvolvimento de novas aplicações e soluções tecnológicas. No entanto, poucos trabalhos investigam como hábitos de usuários podem melhorar o desempenho de arquiteturas de Redes Centradas na Informação. Este trabalho apresenta uma análise de perfis comportamentais de usuários de música e como diferentes perfis influenciam o desempenho de políticas de substituição de cache. Os resultados de um estudo experimental utilizando o ndnSIM com traces reais de diversos usuários, mostram que os hábitos do usuário são fatores determinantes na escolha de uma política de substituição de cache otimizada. As investigações também revelam que a distribuição de popularidade das músicas segue uma aproximação da Lei de Benford, e é possível diferenciar o perfil dos usuários de acordo com o comportamento da curva de Benford das músicas acessadas.

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Figueiredo, Bruno, Fabiola Nakamura, Gardenya Felix, and Eduardo Nakamura. "Usando análises sociais na identificação de nós relevantes em um cenário multi-redes: Operação Licitante Fantasma, um estudo de caso." In Workshop de Computação Aplicada em Governo Eletrônico. Sociedade Brasileira da Computação, 2020. http://dx.doi.org/10.5753/wcge.2020.11262.

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Este artigo propõe o modelo NDNS (Nodes Detection using Network Science) que, usando redes complexas, busca encontrar os nós mais relevantes, em um cenário multi-redes, de forma mais eficiente do que medidas de centralidade estabelecidas. O artigo utiliza, como estudo de caso, uma investigação de corrupção em licitações públicas no Brasil – Operação de Licitante Fantasma. Considerando um período de quatro anos de investigações, o NDNS, quando comparado a quatro medidas de centralidade (betweenness, eigenvector, weighted degree, page rank e sua média geométrica normalizada), alcançou uma precisão de 93% e uma revocação de 94% na detecção de valores fraudulentos contra 38% e 51%, respectivamente, das segundas medidas mais bem posicionadas.

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Afanasyev, Alexander, Xiaoke Jiang, Yingdi Yu, Jiewen Tan, Yumin Xia, Allison Mankin, and Lixia Zhang. "NDNS: A DNS-Like Name Service for NDN." In 2017 26th International Conference on Computer Communication and Networks (ICCCN). IEEE, 2017. http://dx.doi.org/10.1109/icccn.2017.8038461.

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Melati, Seshariana Rahma, Leanna Vidya Yovita, and Ratna Mayasari. "Caching Performance of Named Data Networking with NDNS." In 2021 International Conference on Information Networking (ICOIN). IEEE, 2021. http://dx.doi.org/10.1109/icoin50884.2021.9333907.

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Chandra, Mahesh, V. Eswara Phanindra, S. Prabhu, and Krushna R. Mavani. "Influence of Cu-doping on Terahertz Conductivity and temperature driven phase transition in NdNi1-xCuxO3 Thin Films." In 2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz). IEEE, 2019. http://dx.doi.org/10.1109/irmmw-thz.2019.8874069.

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