Yeung Kai-hau, Alan. / Thesis (Ph.D.)--Chinese University of Hong Kong, 1995. / Includes bibliographical references. / ACKNOWLEDGMENTS --- p.iv / ABSTRACT --- p.v / Chapter CHAPTER 1 --- Introduction --- p.1 / Chapter 1.1 --- The Information Age --- p.2 / Chapter 1.2 --- The Importance of Input/Output --- p.3 / Chapter 1.3 --- Redundant Arrays of Inexpensive Disks --- p.5 / Chapter 1.4 --- Outline of the Thesis --- p.7 / References --- p.8 / Chapter CHAPTER 2 --- Selective Broadcast Data Distribution Systems --- p.10 / Chapter 2.1 --- Introduction --- p.11 / Chapter 2.2 --- The Distributed Architecture --- p.12 / Chapter 2.3 --- Mean Block Acquisition Delay for Uniform Request Distribution --- p.16 / Chapter 2.4 --- Mean Block Acquisition Delay for General Request Distributions --- p.21 / Chapter 2.5 --- Optimal Choice of Block Sizes --- p.24 / Chapter 2.6 --- Chapter Summary --- p.25 / References --- p.26 / Chapter CHAPTER 3 --- Dynamic Multiple Parity Disk Arrays --- p.28 / Chapter 3.1 --- Introduction --- p.29 / Chapter 3.2 --- DMP Disk Array --- p.31 / Chapter 3.3 --- Average Delay --- p.37 / Chapter 3.4 --- Maximum Throughput --- p.47 / Chapter 3.5 --- Simulation with Precise Disk Model --- p.53 / Chapter 3.6 --- Chapter Summary --- p.58 / References --- p.59 / Appendix --- p.61 / Chapter CHAPTER 4 --- Dynamic Parity Logging Disk Arrays --- p.69 / Chapter 4.1 --- Introduction --- p.70 / Chapter 4.2 --- DPL Disk Array Architecture --- p.73 / Chapter 4.3 --- DPL Disk Array Operation --- p.79 / Chapter 4.4 --- Performance of DPL Disk Array --- p.83 / Chapter 4.5 --- Chapter Summary --- p.91 / References --- p.92 / Appendix --- p.94 / Chapter CHAPTER 5 --- Performance Analysis of Mirrored Disk Array --- p.101 / Chapter 5.1 --- Introduction --- p.102 / Chapter 5.2 --- Queueing Model --- p.103 / Chapter 5.3 --- Delay Analysis --- p.104 / Chapter 5.4 --- Numerical Examples and Simulation Results --- p.108 / References --- p.109 / Chapter CHAPTER 6 --- State Reduction in the Exact Analysis of Fork/Join Queues --- p.110 / Chapter 6.1 --- Introduction --- p.111 / Chapter 6.2 --- State Reduction For Closed Fork/Join Queueing Systems --- p.113 / Chapter 6.3 --- Extension To Open Fork/Join Queueing Systems --- p.118 / Chapter 6.4 --- Chapter Summary --- p.122 / References --- p.123 / Chapter CHAPTER 7 --- Conclusion and Future Research --- p.124 / Chapter 7.1 --- Summary --- p.125 / Chapter 7.2 --- Future Researches --- p.126

CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior / Apesar dos avanÃos da ciÃncia, o medo e ansiedade, por razÃes odontolÃgicas, ainda acometem uma grande quantidade de pessoas, comprometendo a procura por tratamento e resultando, ocasionalmente, em baixos nÃveis de saÃde oral. A aparÃncia fÃsica dos instrumentos parece ser um dos principais causadores de medo e ansiedade no meio odontolÃgico, e a seringa anestÃsica à o instrumental que mais desencadeia estes sentimentos. Assim, diminuir a ansiedade e o medo do tratamento odontolÃgico deveria ser uma das prioridades do cirurgiÃo-dentista. Para tanto, a presente dissertaÃÃo teve por objetivo comparar as reaÃÃes apresentadas por crianÃas que foram anestesiadas com um dispositivo em formato lÃdico e com uma seringa tradicional, com a finalidade de analisar se uma mudanÃa no desenho externo da seringa anestÃsica seria capaz de influenciar os nÃveis de ansiedade, medo e dor dos pacientes. Sessenta e quatro crianÃas, com idade ente 4-10 anos, foram distribuÃdas aleatoriamente em dois grupos, de acordo com o dispositivo a ser utilizado na primeira sessÃo anestÃsica. G1 (Convencional) e G2 (Design modificado). Os participantes submeteram-se a duas sessÃes anestÃsicas, e cada paciente foi anestesiado com ambos dispositivos. Um Ãnico pesquisador, odontopediatra, realizou os procedimentos anestÃsicos que foram filmados e consistiram de anestesias terminais infiltrativas, na regiÃo posterior da maxila. Devido ao carÃter multidimensional do medo, ansiedade e dor, uma combinaÃÃo de testes foi utilizada para avaliÃ-los, como: O teste de medo da crianÃa (Child Fear Survey Schedule â Dental Subscale - CFSS-DS), escala de ansiedade facial (Facial Anxiety Scale- FAS), frequÃncia cardÃaca, escala som, olhos e movimento (Sound, Eyes and Motor-SEM), escala visual analÃga â Visual Analogue Scale (VAS) e escala Frankl. As escalas foram aplicadas em momentos predeterminados, como: sala de espera (SE), cadeira odontolÃgica (CO), inÃcio da anestesia (IA) e final da anestesia (FA). ApÃs a segunda sessÃo anestÃsica, as crianÃas escolheram o dispositivo que mais as agradou. Os resultados mostraram que 78% da amostra foi classificada como pouco ansiosa (CFSS-DS). Nenhuma diferenÃa estatisticamente significante pÃde ser observada nas diferentes escalas, ao comparar o dispositivo tradicional com o modificado. A seringa com mudanÃa no design foi a preferida por 57,8% das crianÃas. As crianÃas ansiosas relataram mais dor que as nÃo ansiosas (p=0,001) e o estado emocional variou nas diferentes situaÃÃes: SE, CO, IA e FA. (p<0,05). Assim, concluiu-se que a aparÃncia da seringa à importante, mas nÃo à fundamental no controle da ansiedade, medo e dor de crianÃas submetidas à anestesia odontolÃgica. / Despite advances in Odontology, fear and anxiety regarding dentistry still affect a large number of people who, because of their fears, fail to seek treatment; this can result in low levels of oral health. The physical appearance of the instruments used by dentists seems to be a major cause of such fear and anxiety with regard to dentistry. The anesthetic syringe is the instrument that causes the strongest feelings of fear. So, the prevention of dental anxiety and patients fear should be one of the dentistâs highest priorities, this study aims to compare the reactions shown when children were anesthetized with a modified device and when they were anesthetized with a traditional syringe, and examine the results to see if a change in the external design of the anesthetic syringe can influence the levels of anxiety, fear and pain of patients. Sixty-four children aged 4-10 years were randomly assigned into two groups according to the device to be used in the first session of anesthesia. G1 (Traditional Syringe) and G2 (Modified syringe). Participants underwent two sessions and each patient was anesthetized with both devices. A single researcher performed anesthetic procedures, which were videotaped and the procedure consisted of infiltrative anesthesia in the posterior area of the maxilla. Due to the multidimensional nature of fear, anxiety and pain, a combination of tests was used to access them: Child Fear Survey Schedule - Dental Subscale - CFSS-DS, Facial Anxiety Scale-FAS, heart rate, the SEM scale Sound, Eyes and Motor, the Visual Analogue Scale (VAS) and the Frankl scale. These tests were applied in predefined situations as the waiting room (WR), the dental chair (DC), during the onset of anesthesia (OA) and end of anesthesia (EA). After the second session of anesthesia, children chose the device that they preferred. The results showed that most 78% children were classified as having a low level of anxiety (CFSS-DS). No significant difference was observed when comparing the traditional and modified devices. The syringe with a change in design was preferred by (57.8%) of the children. The anxious children reported more pain than non-anxious (p = 0.001) and their emotional state varied in different situations: WR, DC, OA and EA. (P <0.05). Thus, it was concluded that the appearance of the syringe is important, but not essential in order to control the anxiety, fear and pain which children suffer when undergoing dental anesthesia.

Training aids can play an important role in the training of athletes, but only if they assist in the learning of correct technique. The design of a training aid differs considerably from the design of other products because it is crucial that the mechanisms used in learning a skill must be taken into consideration. Research has shown that this can be achieved by: encouraging specific motor skills, providing feedback, providing support in a safe environment, permitting repetition, permitting progressive learning, or by providing some combination of these. For this to be possible an in-depth understanding of the biomechanical requirements of the sporting activity is essential. A study was carried out to determine the fundamental requirements of a training aid, and to then design and build two working prototype gymnastics training aids. Elite training sessions were observed and High Performance coaches were interviewed to establish the skills that required a training aid and the customer requirements for such a device. On the basis of this information two contrasting gymnastics skills were chosen. The first was a handstand on the rings, a complex motor control skill requiring the gymnast to balance on two moving pendulums, requested by 100% of the coaches interviewed. The second skill was a backward handspring, often the first backward dynamic skill most gymnasts will learn, requested by 89% of the coaches interviewed. The training aids were required to simplify the learning of the skill, whilst still utilising correct technique. The backward handspring aid was also required to effectively support the gymnast but not obstruct a good performance. A biomechanical analysis of each skill was carried out in order to inform the design of suitable training aids. The aids were designed and manufactured in accordance with British Standards, and were then biomechanically assessed to ensure that they correctly aided the learning of the skills. In order to assess the aids: displacement, force and muscle activation data were collected and were used to compare the gymnastics skills with and without the aids. The data showed that the training aids replicated the correct biomechanical requirements of the actual skills: the handstand aid was shown to utilise the same control mechanism as was observed on the rings, and the backward handspring aid permitted a unobstructed good performance and assisted in the learning of the skills with correct technique. Both aids were also demonstrated to out-perform any of the existing training aids.

Equipment of many different types is operated by multiple control levers located in close proximity to each other. Selecting the wrong control, or moving the correct control in the wrong direction, has the potential to cause serious injury (e.g. Burgess-Limerick & Steiner, 2006). The objectives of this research were to use a virtual reality simulation of a generic equipment control task to examine: (1) the consequences of shape coding on selection error rate and reaction time; (2) the effect of mirror versus place control layout on shape coding and reaction time when the side to which the controls levers were placed changed; and (3) the consequences of different directional control-response relationships in the horizontal and vertical plane on direction errors and reaction time. Three experiments were completed by a total of 168 participants. Participants were presented with two identical virtual octagonal rods that could elevate/lower, slew left/right, extend/retract and change colour red/blue. One of the images was computer controlled and the other was controlled by four control levers, mounted on a stand, which could be altered in orientation and effects. The task for the participants involved replicating the movement of the computer controlled image by manipulating the four levers positioned on their right or left side. Each participant completed ten blocks of 16 trials, with each trial requiring sequential movements of each of the four control levers. Twenty-four participants completed Experiment One, using horizontal controls and a control-response relationship in which moving each of the horizontal control upwards caused the stimulus to elevate, slew right; extend; or change its colour to red, referred to as control-response relationship 1 (CRR1). Each participant was randomly assigned to start with shape or non-shape coded controls, changing to the reversed coding condition after five blocks. Fewer selection errors occurred in shape coded conditions in the first five blocks, although the difference was not statistically significant. Reaction times decreased as a function of block, and were higher in shape coded trials. There were very few elevation directional errors. Slew and extension directional errors were less likely when there was a spatial correspondence between the movement of the control and the response. Horizontal controls, and the same set of control-response relationships was used in Experiment Two. Each of the 48 participants was randomly assigned to start the experiment with the controls located on their left or right side, whether to complete the experiment with shape or non-shape coded controls, and finally whether to transfer sides to a mirror or place arrangement after five blocks. An effect of coding on selection errors occurred only in the block immediately following a change of sides. However, the effect of coding on selection errors was only seen among participants transferring to a place arrangement, and there were no differences in the number of selection errors between transfer conditions for either coding conditions, nor were there any differences in reaction times between transfer conditions. Reaction times decreased as a function of block, and longer reaction times were measured in the shape coded trials. An advantage of a mirror arrangement when changing sides was suggested when controls were not shape coded, however no advantage was evident when the controls were shape coded. Ninety-six participants completed Experiment Three. Controls were horizontal or vertical, and data were collected for two directional control-response relationship conditions in each orientation: horizontal CRR1; horizontal CRR2 "up" = lower, slew left, retract and blue; vertical CRR1 "away from operator" = elevate, slew right, extend and red; and vertical CRR2 "away from operator" = lower, slew left, retract and blue. Each participant was randomly assigned to complete the experiment with the controls horizontal or vertical, using shape or non-shape coded controls, in the CRR1 or CRR2 condition. The effect of shape coding on reducing the rate of control selection errors in the first block was not significant, however reaction times for correct movements were consistently longer for shape coded conditions. Elevation directional errors in the horizontal CRR1 condition was minimised in all cases, regardless of whether the control movement and the response were spatially corresponding or not. Similar results were seen for the extension control in the horizontal and vertical CRR1 conditions. In other situations, directional errors were less likely when there was spatial correspondence between the movement of the control lever and the response. While only limited evidence was found to indicate that shape coding reduced the probability of selection errors being made in this situation, the observation that the time taken to make correct responses was consistently longer in the shape coded conditions could be interpreted from an information processing, stage model, perspective as indicating that the additional information available in the shape coding was being processed during the decision making stage. It may be that the effect on selection error rate would have been larger if more controls were involved. The results indicate that directional compatibility effects are not as straightforward as the current standards and guidelines suggest. In most, but not all, situations it is important to ensure that control-response relationships correspond spatially.

The main purpose of this study was to develop and assess an on-land training aid for learning balance in sprint kayaking. The literature has shown the importance of biomechanical analysis and how training aids can provide a beneficial part in the learning process of new skills. An on-water experimental analysis was conducted on experienced paddlers to establish the kinematic characteristics and the centre of rotation position of the kayak-paddler system. From this analysis it was found that the kayak rolling motion is dependent on the paddler's ability and the centre of rotation of the kayak paddler system relative to the seat of the kayak was found to be between 10 cm - 13 cm above the seat. Findings from this analysis were interpreted into technical requirements and integrated into the design of the training aid. Once built the training aid prototype was evaluated by a series of testing and modification to enhance its ability to replicate the on-water kayak. The evaluation data showed that the stationary sprint kayak on-water medial-lateral rolling motion is affected by weight variations and further evaluation demonstrated that the training aid has the ability to replicate the motion for different weights. An experimental assessment on a group of beginners was carried out and the results showed that the training aid was able to facilitate the learning of balance in sprint kayaking. The experimental subjects who used the balance training aid had the same total number of sessions as the control subjects who learned to balance in the actual sprint kayak (experimental, 9 + 1 sessions; control, 9 + 1 sessions). However, the experimental subjects only spent half of the total number of sessions learning on-water (4 + 1 sessions) and the other half on the training aid (5 + 1 sessions).

No description available.

This paper describes the building of a parallel converter for a high-speed serial bus. The high-speed serial port of the Macintosh personal computer is used to implement the bus, while an MC68000 Educational Computer Board is used to perform the serial-to-parallel conversion. The device's performance is evaluated, and possible methods for improving its performance are discussed.

by Chan Yawen. / Thesis submitted in: September 12, 2005. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2005. / Includes bibliographical references (leaves 57-64). / Abstracts in English and Chinese. / Acknowledgement --- p.ii / Abstract --- p.iv / 摘要 --- p.vii / Table of Contents --- p.ix / List of Figures --- p.xii / List of Tables --- p.xiv / Chapter Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- Diseases of the Gastrointestinal (GI) Tract --- p.1 / Chapter 1.2 --- Wireless Capsule Endoscopy --- p.2 / Chapter 1.3 --- Goals of My Research Project --- p.9 / Chapter Part I - --- Experimental Study to Determine the Frequency of Wireless Transmission --- p.11 / Chapter Chapter 2 --- Background --- p.11 / Chapter 2.1 --- Analog and Digital Wireless Video Transmission --- p.11 / Chapter 2.2 --- "Industrial, Scientific and Medical (ISM) Bands" --- p.11 / Chapter 2.3 --- Adsorption of RP Energy by Biological Tissue --- p.13 / Chapter 2.4 --- Frequency used by Implanted/Ingested Devices --- p.13 / Chapter 2.5 --- Incentives of using Higher Frequencies --- p.14 / Chapter 2.6 --- Radiation Efficiency from an Implanted/Ingested Source --- p.15 / Chapter Chapter 3 --- Material and Method --- p.18 / Chapter 3.1 --- Human Body Trunk Experimental Model --- p.18 / Chapter 3.2 --- Radiating and Receiving Antennas --- p.19 / Chapter 3.3 --- Experimental Procedures --- p.21 / Chapter Chapter 4 --- Results and Discussions --- p.23 / Chapter Chapter 5 --- Conclusions --- p.30 / Chapter Part II - --- Prototype Design and Implementation --- p.31 / Chapter Chapter 6 --- Background --- p.31 / Chapter 6.1 --- Prototype Overview --- p.31 / Chapter 6.2 --- Digital and Analog Cameras --- p.32 / Chapter 6.3 --- Digital and Analog Transmitters --- p.34 / Chapter Chapter 7 --- Possible Solutions --- p.38 / Chapter 7.1 --- Analog Camera + Analog Video Transmission --- p.38 / Chapter 7.2 --- Digital Camera + Analog Video Transmission --- p.38 / Chapter 7.3 --- Digital Camera + Digital Video Transmission using WLAN Technology --- p.40 / Chapter 7.4 --- Digital Camera + Digital Video Transmission with Video Compression --- p.42 / Chapter Chapter 8 --- Implementation of the Analog Camera + Analog Transmission Solution --- p.44 / Chapter 8.1 --- Circuit Implementation --- p.44 / Chapter 8.2 --- System Verification --- p.49 / Chapter 8.3 --- Conclusions --- p.51 / Chapter Chapter 9 --- Conclusions and Future Work --- p.53 / Chapter 9.1 --- General Conclusions --- p.53 / Chapter 9.2 --- Future Work --- p.55 / List of Abbreviations --- p.65

Tsang, Chi Chiu. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2008. / Includes bibliographical references (leaves 66-69). / Abstracts in English and Chinese. / Abstract --- p.i / Acknowledgement --- p.iii / Statement of Originality --- p.v / Table of Contents --- p.vii / List of Figures --- p.x / Nomenclature --- p.xii / Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- Motivation --- p.1 / Chapter 1.2 --- Objectives --- p.3 / Chapter 1.3 --- Contributions --- p.3 / Chapter 1.4 --- Thesis Organization --- p.4 / Chapter 2 --- A Ubiquitous Digital Writing System --- p.5 / Chapter 2.1 --- Introduction --- p.5 / Chapter 2.2 --- MEMS Motion Sensing Technology --- p.6 / Chapter 2.2.1 --- Micro-Electro-Mechanical Systems (MEMS) --- p.6 / Chapter 2.2.2 --- Principle of a MEMS Accelerometer --- p.6 / Chapter 2.2.3 --- Principle of a MEMS Gyroscope --- p.7 / Chapter 2.3 --- Architecture of Ubiquitous Digital Writing System --- p.8 / Chapter 2.3.1 --- Micro Inertial Measurement Unit (μlMU) --- p.8 / Chapter 2.3.2 --- Data Transmission Module --- p.10 / Chapter 2.3.3 --- User Interface Software --- p.10 / Chapter 2.4 --- Summary --- p.12 / Chapter 3 --- Calibration of μ-Inertial Measurement Unit --- p.13 / Chapter 3.1 --- Introduction --- p.13 / Chapter 3.2 --- Sources of Error --- p.13 / Chapter 3.2.1 --- Deterministic Errors --- p.13 / Chapter 3.2.2 --- Stochastic Error --- p.14 / Chapter 3.3 --- Calibration of Accelerometers --- p.14 / Chapter 3.4 --- Coordinate Transformation with Gravity Compensation --- p.15 / Chapter 3.4.1 --- Coordinate Transformation --- p.16 / Chapter 3.4.2 --- Attitude Determination --- p.18 / Chapter 3.4.3 --- Gravity Compensation --- p.19 / Chapter 3.5 --- Summary --- p.20 / Chapter 4 --- Zero Velocity Compensation --- p.21 / Chapter 4.1 --- Introduction --- p.21 / Chapter 4.2 --- Algorithm Description --- p.21 / Chapter 4.2.1 --- Stroke Segmentation --- p.22 / Chapter 4.2.2 --- Zero Velocity Compensation (ZVC) --- p.22 / Chapter 4.3 --- Experimental Results and Discussion --- p.23 / Chapter 4.4 --- Summary --- p.24 / Chapter 5 --- Kalman Filtering --- p.28 / Chapter 5.1 --- Introduction --- p.28 / Chapter 5.2 --- Summary of Kalman filtering algorithm --- p.28 / Chapter 5.2.1 --- System Model --- p.28 / Chapter 5.2.2 --- Initialization --- p.29 / Chapter 5.2.3 --- Time Update --- p.32 / Chapter 5.2.4 --- Measurement Update --- p.33 / Chapter 5.2.5 --- Stroke Segmentation --- p.34 / Chapter 5.3 --- Summary --- p.34 / Chapter 6 --- Error Compensation from Position Feedback --- p.35 / Chapter 6.1 --- Introduction --- p.35 / Chapter 6.2 --- Global Positioning System (GPS) --- p.35 / Chapter 6.3 --- Zero z-axis Kalman Filtering --- p.36 / Chapter 6.3.1 --- Algorithm Implementation --- p.36 / Chapter 6.3.2 --- Experimental Results and Discussion --- p.40 / Chapter 6.4 --- Combined Electromagnetic Resonance (EMR) Position Detection Board and μlMU --- p.43 / Chapter 6.4.1 --- EMR Position Detection System --- p.43 / Chapter 6.4.2 --- A Combined Scheme --- p.44 / Chapter 6.4.3 --- Algorithm Implementation --- p.46 / Chapter 6.4.4 --- Synchronization --- p.50 / Chapter 6.4.5 --- Experimental Results and Discussion --- p.50 / Chapter 6.5 --- Summary --- p.54 / Chapter 7 --- Conclusion --- p.55 / Chapter 7.1 --- Future Work --- p.56 / Chapter 7.1.1 --- Improvement in the μlMU --- p.56 / Chapter 7.1.2 --- Combined Camera Optical Tracking and μlMU --- p.57 / Chapter 7.2 --- Concluding Remarks --- p.58 / Chapter A --- Derivation of Kalman Filtering Algorithm --- p.59 / Chapter A.1 --- Introduction --- p.59 / Chapter A.2 --- Derivation of a Priori State Estimation Equation --- p.60 / Chapter A.3 --- Derivation of a Posteriori State Estimation Equation --- p.60 / Chapter A.4 --- Derivation of a Priori Error Covariance Matrix --- p.61 / Chapter A.5 --- Derivation of the Optimal Kalman Gain --- p.62 / Chapter A.6 --- Derivation of a Posteriori Error Covariance Matrix --- p.63 / Chapter B --- Derivation of Process Noise Covariance Matrix --- p.64 / Bibliography --- p.66 / Publications --- p.69

O presente estudo foi realizado baseando-se na multidisciplinaridade do Design aplicado a Odontologia. Buscou-se desenvolver um protótipo de caráter inovador, por meio da reformulação morfológica do instrumental prendedor de rolo de algodão, amplamente utilizado e requisitado no atendimento clínico em Odontopediatria. No estudo deste instrumento a base metodológica utilizada foi o Metaprojeto, visando melhor compreensão e embasamento sobre produtos similares existentes, além de pesquisar e desenvolver novos conceitos. Inicialmente foi feita a observação da utilização de prendedores de rolo disponíveis nas clínicas de Odontopediatria da Faculdade de Odontologia de Bauru, durante o atendimento de pacientes com idade entre 5 a 12 anos, para conhecer os produtos similares e identificar os pontos positivos a serem incorporados e os pontos negativos a serem evitados no projeto do novo produto. Os profissionais que realizavam os atendimentos foram consultados e colaboraram com a seleção dos primeiros conceitos, além do estudo e análise das especificações de fabricantes disponíveis na internet. Para a elaboração do protótipo considerou-se os seguintes critérios: cirurgião dentista com as mãos livres durante o atendimento; morfologia adequada de modo a não atuar como obstáculo no acesso à estrutura dentária; superfície de apoio de contato apropriada para melhor apoio na língua; superfície ou sistema de preensão eficaz em relação aos pontos de apoio da anatomia do paciente, de maneira a não causar desconforto durante o uso; possibilidade de ajuste da pressão necessária para uma satisfatória fixação do rolo, causando o mínimo desconforto; facilidade e simplicidade de manuseio e posicionamento; condições de fabricação e produção em larga escala e de baixo custo. Como resultado este projeto apresenta uma nova e inovadora opção de um produto bastante utilizado na rotina de profissionais da odontologia, propõe um prendedor de rolo de algodão cuja morfologia é composta de dois componentes principais e os mecanismos idealizados para que não ocorra o acúmulo de resíduos e facilite a limpeza e autoclave. O funcionamento se dá de maneira simples bidirecional, com ajuste que permitem a fixação sem necessidade de acionamento do botão, sendo utilizado apenas para a remoção. Possui abertura linear, sistema de regulagem de fácil utilização com nível de ajuste de precisão milimétrica e morfologia desenhada de maneira a minimizar desconforto no paciente e permitir ao profissional manter as mãos livres durante o atendimento. O presente estudo destacou a importância da multidisciplinaridade na concepção de projetos funcionais e inovadores. Espera-se que os dados obtidos auxiliem na concepção de futuros estudos e projetos de produto. / The present study was performed based on the multidisciplinarity of Design applied to Dentistry. We sought to develop a prototype of an innovative character, through the morphological reformulation of the cotton roll fastener instrument, widely used and required in clinical care in Pediatric Dentistry. In the study of this instrument the methodological base used was the Metaproject, aiming at a better understanding and foundation on existing similar products, besides researching and developing new concepts. Initially, it was observed the use of roller fasteners available in the Pediatric Dentistry clinics of the Faculty of Dentistry of Bauru, during the care of patients aged 5 to 12 years, to know the similar products and to identify the positive points to be incorporated and the negative points to avoid in the design of the new product. The professionals who attended the services were also consulted and collaborated with the selection of the first concepts, besides the study and analysis of the specifications of manufacturers available in the internet. For the elaboration of the prototype the following criteria were considered: dental surgeon with hands free during the care; adequate morphology so as not to be an obstacle in access to dental structure; appropriate contact support surface for better support in the tongue; surface or gripping system in relation to the points of support of the patient\'s anatomy so as not to cause discomfort during use; possibility of adjusting the pressure required for a satisfactory setting of the roller, causing minimal discomfort; ease and simplicity of handling and positioning; large-scale, low-cost manufacturing and production conditions. As a result this project presents a new and innovative option of a product widely used in the routine of dentistry professionals, proposes a cotton roll fastener whose morphology is composed of two main components and the mechanisms designed so that there is no accumulation of waste and facilitate cleaning and autoclaving. The operation takes place in a simple bidirectional way, with adjustment that allows the fixation without need of button activation, being used only for the removal. It has a linear aperture, an easy-to-use adjustment system with millimetric precision adjustment level and morphology designed to minimize patient discomfort and allow the professional to keep their hands free during care. The present study highlighted the importance of multidisciplinarity in functional and innovative designing projects. It is hoped that the data obtained will aid in the design of future studies and product designs.