Letteratura scientifica selezionata sul tema "Nodus"

Sipuncula, a marine biota which is commonly called a peanut worm, is a marine biota that is a little "controversial". Some literature also refers to these animals as "unsegmented marine worms" or unsegmented marine worms. Siasia (Sipunculus nodus) usually lives in coastal areas, especially around seagrass beds, mangrove forests, and coral reefs. These biotas tend to inhabit the bottom of the waters, especially in the substrate, so they are categorized as infauna benthic organisms. Siasia (S. nodus) can inhabit soft and hard substrate areas. Based on its ecological function, seagrass forms associations with various kinds of marine life as food providers, shelters, and places to live, causing high diversity of marine life. The basic substrate in the form of flat stones and gravel is a good living environment for macrozoobenthos because it is rich in organic compounds so it has a big population density and diversity.The bottom of the waters in the form of sand and fine sediment is not a good living environment for benthic animals. Factors affecting density and diversity are environmental conditions, habitat, and diet. The same factors also affect the nutritional content of Siasia (S. nodus). So, it is feared that when the population density of Siasia (S. nodus) becomes high in the water there will be competition for food which will have a direct impact on the nutritional content of Siasia (S. nodus). The population density of each water is different, so it is necessary to research the population density of Siasia (S. nodus) based on differences in the substrate of the seagrass area in the waters of Saparua Island, Maluku Province, Central Maluku Regency. The highest population density value of Siasia (Sipunculus nodus) in Saparua Island waters is found in Siri-sori State and the lowest is in Paperu Country.

Flow-directed pulmonary artery catheters provide important information regarding intravascular volume status, cardiac function and vascular resistance. We describe an unusual complication of pulmonary artery catheterization in which a knot formed at the distal end was torn away from the catheter body and migrated from its original position in the right subclavian vein to a distal branch of the right pulmonary artery. Careful attention to insertion and withdrawal techniques could prevent this potentially serious complication.

Orientador: Luiz Carlos Zeferino
Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Ciencias Medicas
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Resumo: Objetivos: Avaliar a detecção do linfonodo sentinela em pacientes com câncer do colo do útero utilizando a combinação de azul patente com tecnécio99m e complicações associadas ao uso do azul patente. Sujeitos e métodos: Este foi um estudo de uma série de casos, para o qual foram selecionadas 56 mulheres com diagnóstico de câncer do colo do útero estádios Ia2,Ib1,Ib2 e IIa da FIGO, que se submeteram ao procedimento de identificação do linfonodo sentinela. O período de realização do estudo foi de maio de 2006 a dezembro de 2007. O estudo é apresentado em dois artigos: o primeiro consiste na detecção do linfonodo sentinela no câncer do colo do útero pela combinação do azul patente com tecnécio 99m e avalia a concordância entre a linfocintigrafia pré-operatória e o mapeamento linfático intra-operatório com o gama probe; o segundo consiste na avaliação das alterações da oximetria de pulso das pacientes submetidas à cirurgia após a injeção do azul patente. Resultados: No primeiro artigo identificou-se pelo menos um linfonodo sentinela em 83,13% das pacientes e a localização mais freqüente destes linfonodos foi na cadeia ilíaca externa. A sensibilidade, especificidade, valor preditivo positivo e valor preditivo negativo foram, respectivamente, 80%, 100%, 100% e 97,67% no histopatológico de congelação. Além disso, observou-se que linfocintigrafia pré operatória detecta um número consideravelmente menor de linfonodos sentinelas quando comparado ao mapeamento linfático intra-operatório com o gama probe. No segundo estudo observou-se que somente uma paciente apresentou reação anafilática. Treze pacientes apresentaram queda de oximetria de pulso (menor que 96% de saturação) após a injeção do azul patente no colo do útero, que durou em média cinco minutos e sem repercussões clínicas; essa queda se associou de forma limítrofe com tumores maiores e localizados ao redor do orifício externo do canal cervical. Conclusões: Concluiu-se que a combinação do azul patente com o tecnécio99m demonstrou excelentes resultados na detecção do linfonodo sentinela; a linfocintigrafia pré-operatória não oferece qualquer vantagem em relação ao mapeamento linfático intra-operatório com azul patente e tecnécio99m. Não houve repercussões clínicas devido à queda da oximetria de pulso e essas alterações se correlacionaram, embora com significância limítrofe, com tumores maiores e localizados ao redor do orifício cervical externo.
Abstract: Objectives: To evaluate sentinel lymph node detection in cervical cancer patients using a combination of patent blue dye and technetium99m and assess complications associated with the use of patent blue dye. Subjects and methods: This study investigated a case series that selected 56 women diagnosed with FIGO stage Ia2, Ib1, Ib2 and IIa cervical cancer who underwent a procedure for sentinel lymph node identification. The study was conducted from May 2006 to December 2007 and was described in two articles. The first article was about a study of sentinel lymph node detection in cervical cancer using a combination of patent blue dye and technetium99m. It assessed the agreement between preoperative lymphoscintigraphy and intraoperative lymphatic mapping with a gamma probe. The second article focused on the evaluation of changes in pulse oximetry readings in patients undergoing surgery after patent blue injection. Results: In the first article, at least one sentinel lymph node was identified in 83.13% of the patients and the most frequent site for finding sentinel lymph nodes was the external iliac chain. The sensitivity, specificity, positive predictive value and negative predictive value were 80%, 100%, 100% and 97.67% respectively on histopathology examination of frozen biopsy. In addition, it was observed that preoperative lymphoscintigraphy detected a substantially lower number of sentinel lymph nodes when compared to intraoperative lymphatic mapping with a gamma probe. In the second study, only one patient presented with an anaphylactic reaction. Thirteen patients showed a decrease in pulse oximetry readings (less than 96% saturation) after patent blue injection into the cervix, which lasted an average of five minutes and had no clinical repercussions. There was a borderline association between this decline in oxygen saturation values and tumors that were larger and located around the external cervical os. Conclusions: It was concluded that a combination of patent blue dye and technetium99m demonstrated excellent results in the detection of sentinel lymph nodes. Preoperative lymphoscintigraphy offers no advantage in relation to intraoperative lymphatic mapping with patent blue dye and technetium99m. There were no clinical repercussions due to lower oxygen saturation values. These changes correlated with tumors that were larger and located around the external cervical os, although the significance of this correlation was borderline.
Doutorado
Ciencias Biomedicas
Doutor em Tocoginecologia

Uvod: Hirurško lečenje nodozne bolesti štitaste žlezde predstavlja jednu od najčešće izvođenih operacija u endokrinoj hirurgiji. Pored klasičnih hirurških metoda, poslednjih godina su se pojavile različite tehnike minimalno invazivne tireoidektomije kao rezultat sveukupnog trenda razvoja minimalno invazivnih hirurških tehnika. Kliničke indikacije i prednosti izvođenja minimalno invazivne video-asistirane tiroidektomije (MIVAT) u odnosu na klasičnu hiruršku tehniku u lečenju nodozne bolesti štitaste žlezde su i dalje nedovoljno definisane i u fokusu su savremenih istraživanja. Cilj istraživanja je procena učestalosti komplikacija (intraoperativno i postoperativno krvarenje, pareza i paraliza laringealnog živca, hipoparatireoidizam) tokom i nakon minimalno invazivne tireoidektomije u nodoznim benignim oboljenjima štitaste žlezde uz poređenje sa klasičnom tireoidektomijom, da se ispita intenzitet postoperativnog bola, merenjem pomoću vizuelno analogne skale tokom sedam postoperativnih dana, nakon minimalno invazivne tireoidektomije u nodoznim benignim oboljenjima štitaste žlezde uz poređenje sa klasičnom tireoidektomijom, kao i da se ispita dužina bolničkog boravka nakon minimalno invazivne tireoidektomije u nodoznim benignim oboljenjima štitaste žlezde uz poređenje sa klasičnom tireoidektomijom. Metodologija: Ispitivanje je sprovedeno kao prospektivna, kontrolisana randomizirana studija, u trajanju od novembra 2014. do aprila 2016. godine i obuhvatila je analizu 100 pacijenata operisanih na Klinici za grudnu hirurgiju Instituta za plućne bolesti Vojvodine zbog nodozne bolesti štitaste žlezde. Svi ispitanici su podeljeni u dve osnovne grupe u odnosu na operativnu tehniku: klasična metoda (KM) i minimalno invazivna videoasistirana metoda (MIVAM). Faze u toku ispitivanja su obuhvatile: analizu podataka o preoperativnim morfo-funkcionalnim dijagnostičkim testovima za nodoznu bolest štitaste žlezde (karakteristike ultrazvučnog nalaza nodozne promene i vrednosti volumena izmenjenog režnja štitaste žlezde), nalaz citološkog pregleda punktata tiroidnog nodusa dobijenog tankom iglom, laboratorijski pokazatelji poremećaja štitaste žlezde u cilju definisanja funkcionog stanja, odnosno postojanja autoimunog oboljenja štitaste žlezde; analizu perioperativnih karakteristika hirurških metoda [dužina incizije (cm), operativno vreme (min), težina odstranjenog patoanatomskog supstrata (gr), intraoperativni gubitak krvi (ml)], analiza ranih postoperativnih komplikacija (krvarenje i hematom, povreda donjeg rekurentnog laringealnog živca (nalaz direktne laringoskopije na kraju operacije), hipokalcemija, kolaps traheje, edem larinksa, serom, infekcija, dehiscencija], analiza nehirurških komplikacija, dužina hospitalizacije u danima, intenzitet i dužina trajanja postoperativnih bolova [(upotreba vizuelno analogne skale (VAS) bola 1, 2 i 7 postoperativnog dana)], kasne postoperativne komplikacije (6 meseci nakon operacije), stepen zadovoljstva esteskim rezultatom (anketa sprovedena na kontrolnom pregledu 6 meseci nakon operacije-kozmetski skor). Rezultati: U periodu izvođenja studije od novembra 2014. do aprila 2016. godine, nakon primene kriterijuma za uključivanje/isključivanje iz studije od 175 preostalo je 102 ispitanika, zbog patohistološkog nalaza maligniteta ex tempore biopsije kod jednog pacijenta, a kao i zbog intraoperativno uočenih izraženih adhezivnih promena kod jednog pacijenta urađena je konverzija, odnosno promena operativne tehnike minimalno invazivne u klasičnu metodu. U statističku obradu je uključeno ukupno 100 ispitanika podeljenih u dve grupe: grupu I bolesnika - KM (n = 50) i grupu II bolesnika - MIVAM (n = 50). U ispitivanje je ukupno uključeno 78 žena i 22 muškarca. U odnosu na polnu strukturu u ispitivanim grupama nije uočena postojanje statistički značajne zastupljenosti u zastupljenosti muškog (p = 0,18), odnosno ženskog pola (p = 0,59). Takođe, uočeno je da među grupama ispitanika ne postoji statistički značajna razlika po godinama života (p = 0,16). Nije bilo statistički značajne razlike između ispitivanih grupa u odnosu na vrstu oboljenja štitaste žlezde i funkcioni status, kao ni u odnosu na ultrazvučne karakteristike solitarnog (dominantnog) nodusa kod ispitanika (veličine nodusa, ehogenost nodusa, ivica nodusa, kalcifikacija, vaskularizacije), u odnosu na citološku dijagnozu aspirata uboda tankom iglom (benigni, neodgovarajući, sumnjivi), te u odnosu na volemn izmenjenog režnja. Analizom perioperativnih pokazatelja hirurških metoda u grupi MIVAM je utvrđena statički značajno manja dužina incije u odnosu na KM grupu (2,0 ± 0,5 cm vs. 7 ± 1,9 cm, p = 0,00), dok se težina patoanatomskog supstata (18,3 ± 6,4 vs. 19,6 ± 5,2 gr, p = 0,21), operativno vreme za izvođenje lobektomije (54 ± 14 vs. 61 ± 16 min, p = 0,25), odnosno operativno vreme za izvođenje tireoidektomije (72 ± 27 vs. 85 ± 24 min, p = 0,36) nisu statitički značajno razlikovali između ispitivanih grupa. U grupi MIVAM, rane postoperativne komplikacije (krvarenje, povreda donjeg rekurentnog laringealnog živca I hipokalcemija) su se javile kod 8% (4/50), a u KM grupi kod je 10% (5/50), što nije bilo statistički značajno (p = 0,72). U odnosu na kasne postoperativne komplikacije, samo je kod jednog pacijenta iz MIVAM grupe registrovano postojanje keloida, dok se (trajni hipoparatiroidizam, recidivantni hipertiroidizam, reakcija na strano telo) nije zabeleženo. Nije uočena statistički značajna razlika (p > 0,005 za sve) u zastupljenosti vrste nalaza patohistološkog pregleda odstranjenog supstrata (koloidna struma, folikularni adenoma, cista, papilarni karcinom i Hashimoto tiroiditis). Pacijenti iz MIVAM grupe statistički značajno imaju manji prosečan intenzitet bola po VAS skali u vremenskim intervalima nakon operacije 6h, 24h i 48 h (p < 0,05, za sve). Ukupni kozmetski skor je bio statistički značajno viši u MIVAM grupi u odnosu na KM grupu (18,9 ± 1,4 vs. 15,8 ± 1,3, p = 0,00). Zaključci:Učestalost ranih postoperativnih komplikacija (intraoperativno i postoperativno krvarenje, pareza i paraliza laringealnog živca, hipokalcemija) je bez signifikantne razlike, praktično podjedanaka kod pacijenata operisanih minimalno invazivnom metodom u komparaciji sa klasičnom metodom. Prosečna dužina trajanja minimalno invazivne tireoidektomije i klasične tireoidektomije je bez signifikatne razlike, što može govoriti o odgovarajućem nivou hirurške tehnike koji omogućava prednosti minimalne invazivnosti kao hirurškog principa. Dužina hospitalizacije nakon minimalno invazivne tireoidektomije je značajno kraća u odnosu na klasičnu tireoidektomiju, što značajno doprinosi sveukupnom oporavku pacijenta, a na taj način i troškovi lečenja se umanjuju.Primena minimalno invazivne tireoidektomije u odnosu na klasičnu tireoidektomiju, dovodi do smanjenja subjektivnog osećaja postoperativnog bola, u toku hospitalizacije (6 i 24 h), kao i sedam dana nakon intervencije. Kozmetski skor, kao pokazatelj zadovoljstva pacijenta sa izgledom ožiljka je statistički značano viši kod pacijenata koji su operisani minimalno invazivnom hirurškom tehnikom u odnosu na pacijente koji su operisani klasičnom metodom, što je u odnosu na predominantnu zastupljenost ženskog pola u ispitivanim grupama od posebnog značaja pri odabiru terapijskog tretmana. Prema rezultatima studije, nameće se opravdanost i potreba uvođenja minimalno invazivne tiroidektomije u standardnu kliničku praksu kao metode hirurškog lečenja nodozne bolesti štitaste žlezde kod pacijenata sa urednim funkcionim statusom štitaste žlezde, kod kojih je veličina solitarnog/dominantnog nodusa do 35 mm.
INTRODUCTION: Surgical treatment of nodular thyroid disease is one of the most commonly performed procedures in endocrine surgery. In addition to traditional surgical methods, different techniques of minimally invasive thyreoid surgery have been developed. Clinical indications for the surgical treatment of nodular thyroid disease with minimally invasive video-assisted surgical technique are still insufficiently defined. The aim of the study was to estimate the incidence of complications (intraoperative and postoperative bleeding, paresis and paralysis of the laryngeal nerve, hypoparathyroidism) during and after minimally invasive thyroidectomy in benign nodular thyroid disease with a comparison with conventional thyroidectomy, to examine the intensity of postoperative pain, measured by a visual analog scale for seven postoperative days after surgery, as well as to examine the length of hospitalisation after minimally invasive thyroidectomy with a comparison with conventional thyroidectomy. METHODOLOGY: The study was conducted as a prospective, randomized controlled studies, from November 2014 to April 2016 and included the analysis of 100 patients operated at the Clinic for Thoracic Surgery, Institute for Pulmonary Diseases due to nodular thyroid disease. All subjects were divided into two basic groups according to the surgical technique: classical method (KM) and minimally invasive video-assisted method (MIVAM). Stages during the study included: analysis of data on preoperative morpho-functional diagnostic tests for thyroid disease (characteristic ultrasound findings, nodule caracteristics, volume of exchanged thyroid gland lobe), cytologic examination of aspirates of thyroid nodules obtained by fine needle, laboratory indicators of thyroid disorders gland in order to define the functional status and the presence of autoimmune thyroid disease; analysis of perioperative characteristics of surgical methods [incision length (cm), operative time (min), weight of removed pathoanatomic substrate (gr), intraoperative blood loss (ml)], the analysis of early postoperative complications (bleeding and hematoma, injury to lower recurrent laryngeal nerve (finding direct laryngoscopy at the end of the operation), hypocalcemia, the collapse of the trachea, laryngeal edema, seroma, infection, dehiscence] analysis nonsurgical complications, length of hospitalisation in hours, the intensity and duration of postoperative pain [(use of the visual analog scale (VAS) pain 1, 2 and 7 postoperative days)], late postoperative complications (6 months after surgery), the level of aesthetic satisfaction score (on control examination 6 months after surgery-cosmetic score). RESULTS: In the period of the study from November 2014 to April 2016, from 175 patients with nodular thyreoid disease 102 was observed after application of the inclusion/exclusion criteria. Since in the further analysis two patients was exluded (due to histological findings of malignancy ex tempore biopsy in one patient, and because of a perceived intraoperatively expressed adhesive changes in one patient underwent conversion) in statistical analysis patients were devided into two groups: group I patients - KM (n = 50) and group II patients - MIVAM (n = 50). The study included a total of 78 women and 22 men, it was observed that between the groups there was no statistically significant difference according to age (p = 0,16). There were no statistically significant differences between the groups in terms of the type of thyroid gland function and functional status, as well as in relation to the ultrasonographic characteristics of solitary (dominant) nodule in the subjects (the size of nodules, echogenicity nodes, the edge nodes, calcification, vascularization), the cytological diagnosis of fine needle aspiration puncture (benign, inappropriate, suspicious) and with respect to the lobe volume. The analysis of indicators of perioperative surgical methods in the group MIVAM was significantly smaller length compared to KM group (2,0 ± 0,5 cm vs. 7 ± 1,9 cm, p = 0,00), until the weight of pathoanatomic supstrate (18,3 6 ± 4 vs. 19 ± 6 5 2 g, p = 0,21), the operating time for performing a lobectomy (54 ± 14 vs. 61 ± 16 min, p = 0,25) or operative time to perform the surgery (72 ± 27 vs. 85 ± 24 min, p = 0,36) were not significantly different between the groups. The group MIVAM, early postoperative complications (bleeding, injury to the lower recurrent laryngeal nerve and hypocalcemia) occurred in 8% (4/50), and KM group in 10% (5/50), which was not statistically significant (p = 0,72). Compared to late postoperative complications, only one patient from group MIVAM registered the existence of keloids, while (permanent hypoparathyroidism, recurrent hyperthyroidism, a reaction to a foreign body) was not recorded. There was no statistically significant difference (p > 0,005 for all) in the presence of histological types of findings review the removed substrate (colloid goiter, follicular adenoma, cysts, papillary carcinoma and Hashimoto's thyroiditis). Patients in MIVAM groups have significantly lower average pain intensity by VAS scale at intervals after surgery 6h, 24h and 48 h (p < 0,05, for all). Total cosmetic score was significantly higher in MIVAM group compared to the KM group (18,9 ± 1,4 vs. 15,8 ± 1,3, p = 0,00). CONCLUSIONS: The incidence of early postoperative complications (intraoperative and postoperative bleeding, paresis and paralysis of the laryngeal nerve, hypocalcemia) were without significant differences between patients operated with minimally invasive method in comparison to the classical method. The average duration of minimally invasive thyroidectomy and classical thyroidectomy were without statistical significance difference, suggesting the appropriate level of surgical technique that enables the advantages of minimal invasiveness as surgical principles. Length of hospitalization after minimally invasive thyroidectomy was significantly shorter compared to conventional thyroidectomy, which significantly contributes to the overall recovery of the patient, lowering the cost of treatment. Minimally invasive thyroidectomy compared to conventional thyroidectomy, decreases the subjective feeling of postoperative pain, during hospitalization (6 and 24 h), as well as seven days after the intervention. In one-fifth of patients who underwent minimally invasive surgery method in the postoperative course of the subjective sensation of pain was not recorded. Cosmetic score as an indicator of patient satisfaction with the appearance of the scar was statistically higher in patients who underwent surgery less invasive surgical technique compared to patients who were operated by the classical method. According to the study, minimally invasive thyroidectomy has been demonstrated to be safe and superior to conventional open techniques for surgical treatment of nodular thyroid disease in patients with normal thyroid function with solitary/dominant nodule size < 35 mm.

Within each web service there is a bottleneck which limits the maximum throughput. In this thesis the bottleneck of the media web service is in the task of transcoding. We explore the option of creating new transcoding nodes on-demand to deal with the computationally expensive task of video transcoding. The thesis presents a prototype for controlling the expansion of a transcoding service into the cloud. Using cloud infrastructure-as-a-service allows for creation of new nodes, without any modication to the software and via a prototype RESTful API using a simple syntax. The prototype also includes a systems integration framework (Chef) to configure new nodes to run any specified service. Due to licensing issues, we could not install the transcoding software itself while performing system testing. A substitute configuration of software of similar complexity was installed instead, and a large suite of tests shows that a single new node can be fully configured and a host notified about the node's existence within approximately 7 minutes. Updates/configurations can then be pushed out to all existing nodes, or a subset of nodes thereof. The destruction of nodes takes less than a minute and implicitly disassociate the nodes with all related resources, allowing for resource management. The thesis also explores the theoretical possibility of using MapReduce as a distributed model for a video transcoding service. Concepts in cloud computing, virtualization, video compression and transcoding are discussed as a part of an in-depth-study.

Ce mémoire analyse certaines pratiques artistiques actuelles (cinéma, performance, photographie) empreintes d’interrogations identitaires et de dualités rejoignant celles de mon projet pictural nous, les autres. La composition inhabituelle du corps et de l’objet-vêtement, dans ce travail, permet de favoriser la controverse et de renouveler les perceptions du regardeur. Tout au long des trois chapitres, six œuvres cinématographiques, performatives et photographiques côtoieront ma série de peintures pour en dévoiler le parcours. De l’identité à la perception, le sujet-objet de mes toiles se joue d’abord de l’image trouble renvoyée au spectateur, tel que le fait l’acteur au cinéma. Entre opposition et annulation, surgit ensuite la fiction neutre et duelle qui émane du performatif, d’où émerge comique et poétique. Finalement, c’est entre hasard et propension que mes choix artistiques de mise en image équilibrent imprévus et réflexes, tout comme la photographie harmonise l’ensemble. Ce mélange matière et couleurs constituant nous, les autres est pour le regardeur une œuvre ouverte prête à déambuler.
This essay explores certain current artistic practices (cinema, performance, photography) marked by identity questions and dualities mirroring those of my pictorial project nous, les autres. Through an unusual composition of body and clothing objects, fictional entities fuel controversy and renew the viewer’s perceptions. In the three chapters, two cinematographic works, two performances and two photographs will stand alongside my series of paintings to reveal their journey. De l’identité à la perception, the subject-object of my paintings, toys with the blurred image shown to the spectator, much like an actor in a movie. Entre opposition et annulation evokes the neutral and dual fiction stemming from a performance giving rise to the poetic and the comical. Finally, entre hasard et propension provides a backdrop for my artistic choice of images to balance mishaps and reflexes, much like photography complementing an ensemble. Through this mixture of matter and colour, nous, les autres takes the form of open artwork.

Ce mémoire est l’aboutissement de mes efforts à nommer et rendre concret ce qui voyage entre les synapses de mon cerveau en ce qui a trait à l’art, à mes visions de l’art, à mes manières de faire de l’art. À la place de l’art comme moteur de changement personnel et social. À la recherche en art. Bref, à l’art comme expérience sensorielle, conceptuelle et esthétique. Personnelle et collective. Se rapprochant plus du style « écrit d’artiste » que d’un texte théorique, ce mémoire propose des réflexions en lien au commun dans ses deux significations. Soit celle qui réfère au banal et celle qui renvoie au collectif. Nous sommes plusieurs se veut une ode au précaire. À l’intuition, aux débuts, au processus. À l’ordinaire, au banal et au commun. À la communauté. Depuis toujours, je baigne dans ces eaux. Je tourne autour de ce pot : le quotidien. Les lectures entreprises associées à ce champ de recherche ont été des plus révélatrices. Ce texte aborde donc les thématiques du quotidien, de l’excellence ordinaire, et des problématiques en lien avec les termes vulgaire, ambigu et superficiel.

Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2007.
Includes bibliographical references (p. 87-91).
Can one build, and efficiently use, networks of arbitrary size and topology using a "standard" node whose resources, in terms of memory and reliability, do not need to scale up with the complexity and size of the network? This thesis addresses two important aspects of this question. The first is whether one can achieve efficient connectivity despite the presence of a constant probability of faults per node/link. Efficient connectivity means (informally) having every pair of regions connected by a constant fraction of the independent, entirely non-faulty paths that would be present if the entire network were fault free - even at distances where each path has only a vanishingly small probability of being fault-free. The answer is yes, as long as some very mild topological conditions on the high level structure of the network are met - informally, if the network is not too "thin" and if it does not contain too many large "holes". The results go against some established "empyrical wisdom" in the networking community. The second issue addressed by this thesis is whether one can route efficiently on a network of arbitrary size and topology using only a constant number c of bits/node (even if c is less than the logarithm of the network's size!). Routing efficiently means (informally) that message delivery should only stretch the delivery path by a constant factor. The answer again is yes, as long as the volume of the network grows only polynomially with its radius (otherwise, we run into established lower bounds). This effectively captures every network one may build in a universe (like our own) with finite dimensionality using links of a fixed, maximum length and nodes with a fixed, minimum volume. The results extend the current results for compact routing, allowing one to route efficiently on a much larger class of networks than had previously been known, with many fewer bits.
by Enoch Peserico.
Ph.D.

The number of users adopting cellular system technologies over the past years has been enormous. This rapid adoption is not comparable in any other technology. Additionally, this has meant that these users have (at least some of the time) the possibility of connectivity to others and to remote services (advanced data and voice services, such as video conferences, mobile TV, navigation, and location services). Increasingly there is no longer a clear boundary between the wide area cellular network and Internet services, as the wide area cellular network is evolving from circuit switched based technologies to an IP based system; hence these wide area cellular systems are simply becoming part of the Internet. This evolution has become a challenge for the telecommunication operators, who have been used to completely controlling their network services and billing. In an attempt to maintain this traditional role for telecommunication operators, telecommunication vendors have introduced the IP Multimedia Subsystem (IMS). A system designed to enable telecommunication operators to be able to bill the user for all of the different services accessed through the wide area cellular network. The goal of such a system is to prevent the telecommunication operators from becoming a "bit pipe" (i.e., simply providing "commodity priced" connectivity). Another relevant change that has direct impact upon this project is the role of mobile handsets as gateways between sensor networks and other networks (especially the wide area cellular networks or Internet). This has lead to integrated solutions, such as the smart house concept, mobile health monitoring, and others. This thesis project is a collaboration between Ericsson Research and SUUNTO, in which we have implemented a system for monitoring a user’s heart rate via IMS. The system (has a special focus on sports activities, but it could easily be adapted for health care) is based on internetworking sensor networks, specifically a heart rate belt that transmits data wirelessly, with the IMS network through a mobile phone or a PC. The implemented service runs on top of the SIP Presence service. This project examines two alternatives. The first is a mobile scenario, in which a person is jogging outdoors, in this setting the sensor node communicates via the person’s mobile phone, through the IMS network to a monitoring application. The second scenario is more fixed; such as a gym environment, where the sensor node communicates with a personal computer which in turn publishes the data via IMS. Once the data has been published to the Presence and group management sever, an application server subscribed to the athlete’s Presence service will be notified. The people interested in viewing this data will be able to see it through any web-browser. It will even be possible to archive, and download the data for later use by other applications. The system is not optimized yet for a truly real-time communication, as the Presence service does not offer this as other technologies (RTP, SRTP or XMPP) do. There is a big delay difference between the mobile and the fixed solution. We can say that the fixed solution is almost a real-time system for transmitting low frequency data as heart rate information. This project is a first approach to a final high performance system.
Antalet användare som har fått tillgång till mobiltelefon under de senaste åren har varit enorm. Detta snabbt antagande är inte jämförbar med någon annan teknik. Dessutom innebär också detta att dessa användare har (åtminstone ibland) möjligheten till anslutning till andra och till avlägsna tjänster (avancerad data-och taltjänster, t.ex. videokonferenser, mobil TV, navigation och lokaliseringstjänster). Idags läget finns det inte längre en tydlig gräns mellan cellulära nätet och Internettjänster. Efter cellulära nätets utveckling från kretskopplad teknik till ett IP-baserat system, så håller dom cellulära systemem på att bli en del av Internet. Denna utveckling har blivit en utmaning för telekommunikationsföretag, som har varit vana att helt kontrollera sina nättjänster och fakturering. I ett försök att bevara denna traditionella roll för telekommunikationsföretag, har telekom-leverantörer infört IP Multimedia Subsystem (IMS). Ett system som syftar på att kunna göra telekommunikationsföretagen kapabla till att debitera användaren för alla dem olika tjänsterna som han har tillgång till via deras cellulära nät. Målet med ett sådant system är att förhindra telekommunikationsföretagen från att bli en "bit pipe" (dvs bara ge prissatt konnektivitet). En annan betydelsefull förändring som har direkt inverkan på detta projekt är den roll som mobiltelefoner kan utföra som gateways mellan sensornätverk och cellulära nät eller Internet. Detta har påverkat flera integrerade lösningar, såsom smarta hus begrepp, mobil hälsoövervakning och andra. Denna examensarbetes projekt är ett samarbete mellan Ericsson Research och Suunto, där vi har implementerat ett system för övervakning av en användares hjärtslag genom IMS. Systemet (har en särskild inriktning på sport, men det kan lätt anpassas för hälso-och sjukvård) är baserad på Internetworking sensornätverk, särskilt en hjärtfrekvens bälte som överför data trådlöst till en mobiltelefon eller en dator, som sedan skickar ut datan via IMS-nätverket. Tjänsten genomförs ovan på SIP Presence service. Projektet undersöker två alternativ. Den första är en mobil scenario; exempelvis där en person joggar utomhus, vid ett sådant tillfälle kommunicerar sensorn noden genom personens mobiltelefon, via IMS-nätverk med en övervaknings application. Det andra scenariot är mer statiskt och ger inte samma rörlighet, denna lösning passar bättre in på gym activiteter eller liknande. I denna implementering kommunicerar sensorn noden med en persondator som i sin tur publicerar uppgifterna via IMS. När uppgifterna har publicerats hos Presence and group management (PGM) servern. En applikations server som är uppskriven på att få friidrottarens närvaro tjänst kommer att meddelas. De människor som intresserade av att se denna data kommer att kunna göra det via någon webbläsare. Det kommer även att vara möjligt att arkivera och hämta datan för senare en användning men andra tillämpningar. Systemet är inte optimerad ännu för en verkligt realtid, eftersom Presence service inte erbjuder detta ännu som andra tekniker (RTP, SRTP eller XMPP) gör. Det finns en stor fördröjning skillnad mellan den mobila och fasta lösningen. Vi kan säga att den fasta lösningen är nästan ett realtids-system för överföring av lågfrekventa uppgifter som hjärtslag information. Detta projekt är en första strategi för en slutlig högpresterande system.

Thesis (MPhil)--University of Stellenbosch, 2005.
ENGLISH ABSTRACT: South Africa requires sustained economic growth in order to alleviate the poverty of its urban population. This study is based on the hypothesis that in order to sustain the existing "good" infrastructure and secure the "high-quality" human resource base of our country, it is necessary to be proactive with regard to the management of commercial/business nodes in order to ensure that they do not deteriorate or become stifled and/or excluded from delivering their full economic potential/contribution towards the urban economy. This study contains a synopsis of the research conducted by the author on behalf of the City of Cape Town - Economic Development and Tourism Directorate during 2003. The purpose was to develop a uniform model to ascertain and monitor the economic health of business areas within the Cape Town metropole. The research was presented to the City of Cape Town in the form of a protocol, which has subsequently been utilised to establish economic profiles for the Athlone Central Business District, Gatesville/Rylands business centre and Airport Industria. The focus and purpose of the protocol was to place tbe City Council in a position whereby the relative economic health of specific business/mixed-use areas within the Cape Metropolitan Area can be properly assessed, selected interventions made where necessary and results monitored. The point of departure that was adopted from the outset was that the assessment need not just relate to negative trends or indications of economic distress, but that there is substantial merit in assessing nodes that are seemingly "getting it right" or "booming".
AFRIKAANSE OPSOMMING: Suid-Afrika benodig volgehoue ekonomiese groei ten einde die armoede van sy stedelike bevolking te verlig. Hierdie navorsing is gebaseer op die hipotese dat ten einde die bestaande "goeie" infrastruktuur te handhaaf en ons land se menslike hulpbronbasis van hoë gehalte te verseker, dit nodig is om proaktief te wees ten opsigte van die bestuur van kommersiële/sakepunte ten einde te verseker dat hulle nie agteruitgaan of doodwurg en/of uitgesluit raak van die lewering van hulle volle ekonomiese potensiaal/bydrae tot die stedelike ekonomie nie. Hierdie tesis bevat 'n sinopsis van die navorsing wat die outeur gedurende 2003 namens die Stad Kaapstad - Direktoraat: Ekonomiese _Ontwikkeling en Toerisme - gedoen het. Die doel was die ontwikkeling van 'n eenvormige model om die ekonomiese welstand van sakegebiede binne die Kaapstadse metropool te bepaal en te monitor. Die navorsing is in die vorm van 'n protokol aan die Stad Kaapstad gelewer. Die protokol is daarna aangewend om ekonomiese profiele vir die Athlone Sentrale Sakegebied, Gatesville/Rylands sakesentrum en Airport Industria op te stel. Die fokus en doel van die protokol was om die Stadsraad in 'n posisie te plaas waardeur die relatiewe ekonomiese welstand van spesifieke sakegebiede of gebiede met verskillende ondernemings in die Kaapse Metropolitaanse Gebied behoorlik geassesseer kan word, geselekteerde intervensies waar nodig gemaak kan word en resultate gemonitor kan word. As uitgangspunt is van die begin aanvaar dat die behoefte aan assessering nie net met negatiewe tendense of aanduidings van ekonomiese nood verband hou nie, maar dat daar ook wesenlike meriete lê in die assessering van gebiede wat op die oog af "dinge regkry" of "floreer".