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Artykuły w czasopismach na temat "THRESHOLD SENSITIVE"
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Sala, Gianluca, Camilla Lanfranconi, Paolo Frattini, Giulia Rusconi i Giovanni B. Crosta. "Cost-sensitive rainfall thresholds for shallow landslides". Landslides 18, nr 9 (17.06.2021): 2979–92. http://dx.doi.org/10.1007/s10346-021-01707-4.
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AbstractThe risk management of rainfall-induced landslides requires reliable rainfall thresholds to issue early warning alerts. The practical application of these thresholds often leads to misclassifications, either false negative or false positive, which induce costs for the society. Since missed-alarm (false negative) and false-alarm (false positive) cost may be significantly different, it is necessary to find an optimal threshold that accounts for and minimises such costs, tuning the false-alarm and missed-alarm rates. In this paper, we propose a new methodology to develop cost-sensitive rainfall thresholds, and we also analyse several factors that produce uncertainty, such as the accuracy of rainfall intensity values at landslide location, the time of occurrence, the minimum rainfall amount to define the non-triggering event, and the variability of cost scenarios. Starting from a detailed mapping of landslides that occurred during five large-scale rainfall events in the Italian Central Alps, we first developed rainfall threshold curves with a ROC-based approach by using both rain gauge and bias-adjusted weather radar data. Then, based on a reference cost scenario in which we quantified several cost items for both missed alarms and false alarms, we developed cost-sensitive rainfall threshold curves by using cost-curve approach (Drummond and Holte 2000). Finally, we studied the sensitivity of cost items. The study confirms how important is the information regarding rainfall intensity at the landslide site for the development of rainfall thresholds. Although the use of bias-corrected radar strongly improves these values, a large uncertainty related to the exact time of landslide occurrence still remains, negatively affecting the analysis. Accounting for the different missed-alarm and false-alarm misclassification costs is important because different combinations of these costs make an increase or decrease of the rainfall thresholds convenient. In our reference cost scenario, the most convenient threshold is lower than ROC-based thresholds because it seeks to minimise the number of missed alarms, whereas the missed-alarm costs are almost seven times greater than false-alarm costs. However, for different cost scenarios, threshold may vary significantly, as much as half an order of magnitude.
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Roy, Nihar Ranjan, i Pravin Chandra. "Threshold sensitive clustering in SEP". Sustainable Computing: Informatics and Systems 25 (marzec 2020): 100367. http://dx.doi.org/10.1016/j.suscom.2019.100367.
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Mu, Yi, i C. M. Savage. "Phase-sensitive above-threshold laser amplifiers". Physical Review A 49, nr 5 (1.05.1994): 4093–100. http://dx.doi.org/10.1103/physreva.49.4093.
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Ferreira, Guilherme A., Romulo Bertuzzi, Adriano E. Lima-Silva, Carlos Malfatti, Fernando R. De-Oliveira i Raul Osiecki. "Identification of training status differences using perceived exertion threshold". Applied Physiology, Nutrition, and Metabolism 41, nr 4 (kwiecień 2016): 456–59. http://dx.doi.org/10.1139/apnm-2015-0478.
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We investigated if the rate of perceived exertion (RPE) threshold is as sensitive as the lactate threshold to detect training differences. Lactate and RPE thresholds were identified in well-trained cyclists and physically active males. Power output was higher in well-trained cyclists than in physically active individuals for both thresholds (p < 0.05). Our results suggest that RPE threshold is successful in discriminating differences between well-trained cyclists and physically active individuals.
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Pflug, Justin M., Yiwen Fang, Steven A. Margulis i Ben Livneh. "Interactions between thresholds and spatial discretizations of snow: insights from estimates of wolverine denning habitat in the Colorado Rocky Mountains". Hydrology and Earth System Sciences 27, nr 14 (24.07.2023): 2747–62. http://dx.doi.org/10.5194/hess-27-2747-2023.
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Abstract. Thresholds can be used to interpret environmental data in a way that is easily communicated and useful for decision-making purposes. However, thresholds are often developed for specific data products and time periods, changing findings when the same threshold is applied to datasets or periods with different characteristics. Here, we test the impact of different spatial discretizations of snow on annual estimates of wolverine denning opportunities in the Colorado Rocky Mountains, defined using a snow water equivalent (SWE) threshold (0.20 m) and threshold date (15 May) from previous habitat assessments. Annual potential wolverine denning area (PWDA) was thresholded from a 36-year (1985–2020) snow reanalysis model with three different spatial discretizations: (1) 480 m grid cells (D480), (2) 90 m grid cells (D90), and (3) 480 m grid cells with implicit representations of subgrid snow spatial heterogeneity (S480). Relative to the D480 and S480 discretizations, D90 resolved shallower snow deposits on slopes between 3050 and 3350 m elevation, decreasing PWDA by 10 %, on average. In years with warmer and/or drier winters, S480 discretizations with subgrid representations of snow heterogeneity increased PWDA, even within grid cells where mean 15 May SWE was less than the SWE threshold. These simulations increased PWDA by upwards of 30 % in low-snow years, as compared to the D480 and D90 simulations without subgrid snow heterogeneity. Despite PWDA sensitivity to different snow spatial discretizations, PWDA was controlled more by annual variations in winter precipitation and temperature. However, small changes to the SWE threshold (±0.07 m) and threshold date (±2 weeks) also affected PWDA by as much as 82 %. Across these threshold ranges, PWDA was approximately 18 % more sensitive to the SWE threshold than the threshold date. However, the sensitivity to the threshold date was larger in years with late spring snowfall, when PWDA depended on whether modeled SWE was thresholded before, during, or after spring snow accumulation. Our results demonstrate that snow thresholds are useful but may not always provide a complete picture of the annual variability in snow-adapted wildlife denning opportunities. Studies thresholding spatiotemporal datasets could be improved by including (1) information about the fidelity of thresholds across multiple spatial discretizations and (2) uncertainties related to ranges of realistic thresholds.
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Kalogianni, E. "Physiological properties of wind-sensitive and tactile trichoid sensilla on the ovipositor and their role during oviposition in the locust". Journal of Experimental Biology 198, nr 6 (1.06.1995): 1359–69. http://dx.doi.org/10.1242/jeb.198.6.1359.
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The physiological properties of the ovipositor hair sensilla of the desert locust and their responses to wind and to direct mechanical displacement are described. The hairs on the external surfaces of the ventral and dorsal ovipositor valves respond to wind stimulation, whereas the hairs on the inner surfaces of the dorsal valves are not wind-sensitive. All ovipositor hairs, however, respond to tactile displacement. Imposed tactile stimulation reveals two physiologically distinct types of ovipositor tactile hairs: the hairs on the inner surface of the dorsal valves are high-threshold hairs (threshold angular deflection of 26­67 ° at 1 Hz) that respond phasically, whereas the hairs on the lateral and ventral areas of the ventral valves and the lateral areas of the dorsal valves are low-threshold hairs (threshold angular deflection of 6­20 ° at 1 Hz) that respond phasotonically. There is no apparent difference in the length of the two physiologically distinct types of hairs. Both high- and low-threshold hairs are directionally sensitive, with maximal responses to proximal deflection, towards the abdomen, and are also velocity-sensitive. High-threshold hairs have velocity thresholds of 40­50 ° s-1 for some hairs and 110­140 ° s-1 for others for a deflection angle of 35 °, whereas low-threshold hairs have lower velocity thresholds of less than 5 ° s-1 for the same deflection. High-threshold hairs adapt rapidly to repetitive stimulation after as few as four cycles of stimulation at 0.5 Hz. Low-threshold hairs continue to respond after 40 cycles of stimulation at 0.5 Hz and show little adaptation to repetitive stimulation at frequencies ranging from 0.1 to 5 Hz. Low-threshold hairs respond with bursts of spikes at frequencies that reflect both the velocity and the duration of the stimulus. Furthermore, low-threshold hairs show little adaptation after 30 min of stimulation that simulates oviposition digging. It is suggested (a) that low- and high-threshold ovipositor hairs detect phasic wind and/or tactile stimuli in non-ovipositing locusts and (b) that low-threshold hairs can also signal rhythmic tactile inputs during oviposition digging.
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Zhang, Yuan, Xiao-Ning Wang, Hai-Yu Ding, Yang Dai, Sen Ding i Xin Gao. "Threshold Responses in the Taxonomic and Functional Structure of Fish Assemblages to Land Use and Water Quality: A Case Study from the Taizi River". Water 11, nr 4 (30.03.2019): 661. http://dx.doi.org/10.3390/w11040661.
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Biological functional traits help to understand specific stressors that are ignored intaxonomic data analysis. A combination of biological functional traits and taxonomic data ishelpful in determining specific stressors which are of significance for fish conservation and riverbasin management. In the current study, the Taizi River was used as a case study to understand therelationships between the taxonomic and functional structure of fish and land use and waterquality, in addition to determining the thresholds of these stressors. The results showed thattaxonomic structure was significantly affected by the proportion of urban land and specificconductivity levels, while functional metrics were influenced by the proportions of farmland andforest. Threshold indicator taxa analysis found that Phoxinus lagowskii, Barbatula barbatula nuda,Odontobutis obscura, and Cobitis granoei had negative threshold responses along the gradients ofurban developments and specific conductivity. There was a significant change in fish taxonomiccomposition when the proportion of urban land exceeded a threshold of 2.6–3.1%, or specificconductivity exceeded a threshold of 369.5–484.5 μS/cm. Three functional features—habitatpreference, tolerance to disturbances, and spawning traits—showed threshold responses to theproportion of farmland and forest. The abundance of sensitive species should be monitored as partof watershed management, as sensitive species exhibit an earlier and stronger response to stressorsthan other functional metrics. Sensitive species had a positive threshold response to the proportionof forest at 80.1%. These species exhibited a negative threshold response to the proportion offarmland at 13.3%. The results of the current study suggest that the taxonomic and functionalstructure of fish assemblages are affected by land use and water quality. These parameters shouldbe integrated into routine monitoring for fish conservation and river basin management in the TaiziRiver. In addition, corresponding measures for improving river habitat and water quality shouldbe implemented according to the thresholds of these parameters.
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Mair, I. W. S., i E. Laukli. "Air Conduction Thresholds after Myringoplasty and Stapes Surgery: A Conventional and High Frequency Audiometric Comparison". Annals of Otology, Rhinology & Laryngology 95, nr 4 (lipiec 1986): 327–30. http://dx.doi.org/10.1177/000348948609500402.
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A comparison has been made of air conduction thresholds after myringoplasty and stapes surgery for otosclerosis in both the conventional (0.25 to 8 kHz) and high frequency (8 to 20 kHz) ranges. Significant threshold losses occurred in the high frequencies following both procedures. Threshold improvement was significantly greater at the lower frequencies following stapes surgery, while high frequency threshold deterioration was significantly less in the myringoplasty group. High frequency audiometry may prove to be a sensitive monitor of middle ear surgical techniques.
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LOOP, MICHAEL S., i DAVID K. CROSSMAN. "High color-vision sensitivity in macaque and humans". Visual Neuroscience 17, nr 1 (styczeń 2000): 119–25. http://dx.doi.org/10.1017/s0952523800171123.
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Psychophysical (behavioral) detection thresholds and color-discrimination thresholds were determined in a macaque using a two-alternative forced-choice procedure. On a white background, detection thresholds were determined for a white increment and three spectral increments: 618, 516, and 456 nm. Intermixed with detection threshold determinations, color-discrimination thresholds were determined by presenting the white increment, and one of the spectral increments, at 1.0 log units above their respective detection thresholds and dimming both until discrimination performance fell to threshold. The monkey could discriminate the color of the increments at detection threshold because the average color-discrimination threshold was 0.98 ± 0.14 log attenuation. Because the monkey was much more sensitive to the spectral increments than the white increment, we performed an unconventional experiment. We determined the monkey's detection threshold for the white increment alone, and with broadband color filters in the white light path without adjusting the light's intensity. Insertion of several color filters in the light path lowered detection thresholds of both the macaque and six human trichromats. We believe that this improvement in detection thresholds produced by simply inserting color filters in a white light path is a threshold manifestation of the Helmholtz-Kohlrausch effect and suggests that one of color vision's important evolutionary advantages may be improved detection sensitivity.
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Polena, Helena, Marlène Chavagnac-Bonneville, Laurent Misery i Michèle Sayag. "Burden of Sensitive Skin (BoSS) Questionnaire and Current Perception Threshold: Use as Diagnostic Tools for Sensitive Skin Syndrome". Acta Dermato-Venereologica 101, nr 11 (30.11.2021): adv00606. http://dx.doi.org/10.2340/actadv.v101.365.
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The assessment of sensitive skin syndrome, characterized by subjective unpleasant sensations, remains a challenge, since there is no international consensus on the best diagnostic tools. This study evaluated the combination of the Burden of Sensitive Skin (BoSS) questionnaire and the current perception threshold as diagnostic tools for sensitive skin syndrome, and the relationship between BoSS and the subjects’ smoking status, phototype and skin type. A total of 100 women completed the BoSS questionnaire, and current perception threshold was measured on the face. The BoSS score was significantly higher in the self-reported sensitive skin group compared with the non-sensitive skin group (25.61 vs 14.05; p < 0.001), and in non-smokers vs smokers (23.00 vs 18.37; p < 0.05). In addition, the current perception threshold values were similar between the sensitive and non-sensitive groups. These results suggest that BoSS is a better diagnostic tool for sensitive skin syndrome than the current perception threshold, and that smokers less frequently have sensitive skin than do non-smokers.
Rozprawy doktorskie na temat "THRESHOLD SENSITIVE"
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Klassen, Mark E., i University of Lethbridge Faculty of Arts and Science. "Risk-sensitive foraging in rufous hummingbirds (Selasphorus Rufus) : a test of the twin-threshold model". Thesis, Lethbridge, Alta. : University of Lethbridge, Faculty of Arts and Science, 2005, 2005. http://hdl.handle.net/10133/264.
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I tested the twin-threshold model, a risk-sensitive foraging model incorporating both a starvation threshold and a higher reproductive threshold. The model predicts risk-adverse foraging when an animal's energy state is close to the starvation threshold and risk-prone foraging when the animal's energy state is close to the reproductive threshold. Wild rufous hummingbirds (Selasphorus rufus) were presented with a choice of three artificial flower types that had either no, moderate or high variability around a common mean. I manipulated energy state by changing either the mean nectar volume or altering the cost of foraging (long versus short corollas). When the energy state of hummingbirds was close to the reproductive threshold they preferred the variable options. When the energy state of hummingbirds was close to the starvation threshold they preferred the nil option. Hummingbirds responded in a manner consistent with the twin-threshold model.x, 90 leaves ; 29 cm.
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Lim, Lee Booi. "Network delay control through adaptive queue management". Thesis, Loughborough University, 2011. https://dspace.lboro.ac.uk/2134/8887.
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Timeliness in delivering packets for delay-sensitive applications is an important QoS (Quality of Service) measure in many systems, notably those that need to provide real-time performance. In such systems, if delay-sensitive traffic is delivered to the destination beyond the deadline, then the packets will be rendered useless and dropped after received at the destination. Bandwidth that is already scarce and shared between network nodes is wasted in relaying these expired packets. This thesis proposes that a deterministic per-hop delay can be achieved by using a dynamic queue threshold concept to bound delay of each node. A deterministic per-hop delay is a key component in guaranteeing a deterministic end-to-end delay. The research aims to develop a generic approach that can constrain network delay of delay-sensitive traffic in a dynamic network. Two adaptive queue management schemes, namely, DTH (Dynamic THreshold) and ADTH (Adaptive DTH) are proposed to realize the claim. Both DTH and ADTH use the dynamic threshold concept to constrain queuing delay so that bounded average queuing delay can be achieved for the former and bounded maximum nodal delay can be achieved for the latter. DTH is an analytical approach, which uses queuing theory with superposition of N MMBP-2 (Markov Modulated Bernoulli Process) arrival processes to obtain a mapping relationship between average queuing delay and an appropriate queuing threshold, for queue management. While ADTH is an measurement-based algorithmic approach that can respond to the time-varying link quality and network dynamics in wireless ad hoc networks to constrain network delay. It manages a queue based on system performance measurements and feedback of error measured against a target delay requirement. Numerical analysis and Matlab simulation have been carried out for DTH for the purposes of validation and performance analysis. While ADTH has been evaluated in NS-2 simulation and implemented in a multi-hop wireless ad hoc network testbed for performance analysis. Results show that DTH and ADTH can constrain network delay based on the specified delay requirements, with higher packet loss as a trade-off.
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MELO, Carlos Eduardo Castor de. "Similaridade de algoritmos em cenários sensíveis a custo". Universidade Federal de Pernambuco, 2015. https://repositorio.ufpe.br/handle/123456789/17808.
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Dissertação Mestrado- Carlos Eduardo Castor de Melo.pdf: 2325318 bytes, checksum: 1a456db1f76d03f35cc83b12a6026b6b (MD5)Made available in DSpace on 2016-09-06T17:26:12Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Dissertação Mestrado- Carlos Eduardo Castor de Melo.pdf: 2325318 bytes, checksum: 1a456db1f76d03f35cc83b12a6026b6b (MD5) Previous issue date: 2015-08-27
FACEPE
análise da similaridade entre algoritmos de aprendizagem de máquina é um importante aspecto na área de Meta-Aprendizado, onde informações obtidas a partir de processos de aprendizagem conhecidos podem ser utilizadas para guiar a seleção de algoritmos para tratar novos problemas apresentados. Essa similaridade é geralmente calculada através de métricas globais de desempenho, que omitem informações importantes para o melhor entendimento do comportamento dos algoritmos. Também existem abordagens onde é verificado o desempenho individualmente em cada instância do problema. Ambas as abordagens não consideram os custos associados a cada classe do problema, negligenciando informações que podem ser muito importantes em vários contextos de aprendizado. Nesse trabalho são apresentadas métricas para a avaliação do desempenho de algoritmos em cenários sensíveis a custo. Cada cenário é descrito a partir de um método para escolha de limiar para a construção de um classificador a partir de um modelo aprendido. Baseado nos valores de desempenho em cada instância, é proposta uma forma de avaliar a similaridade entre os algoritmos tanto em nível de problema como em nível global. Os experimentos realizados para ilustrar as métricas apresentadas neste trabalho foram realizados em um estudo de Meta-Aprendizado utilizando 19 algoritmos para a classificação das instâncias de 152 problemas. As medidas de similaridades foram utilizadas para a criação de agrupamentos hierárquicos. Os agrupamentos criados mostram como o comportamento entre os algoritmos diversifica de acordo com o cenário de custo a ser tratado.
The analysis of the similarity between machine learning algorithms is an important aspect of Meta-Learning, where knowledge gathered from known learning processes can be used to guide the selection of algorithms to tackle new learning problems presented. This similarity is usually calculated through global performance metrics that omit important information about the algorithm behavior. There are also approaches where the performance is verified individually on each instance of a problem. Both these approaches do not consider the costs associated with each problem class, hence they neglect information that can be very important in different learning contexts. In this study, metrics are presented to evaluate the performance of algorithms in cost sensitive scenarios. Each scenario is described by a threshold choice method, used to build a crisp classifier from a learned model. Based on the performance values for each problem instance, it is proposed a method to measure the similarity between the algorithms in a local level (for each problem) and in a global level (across all problems observed). The experiments used to illustrate the metrics presented in this paper were performed in a Meta-Learning study using 19 algorithms for the classification of the instances of 152 learning problems. The similarity measures were used to create hierarchical clusters. The clusters created show how the behavior of the algorithms diversifies according to the cost scenario to be treated.
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Lopes, Karina Narciso. "Avaliação dos limiares sensitivo e doloroso em mulheres com dismenorreia primária moderada ou grave". Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/17/17145/tde-26082016-112528/.
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A dismenorreia primária ou menstruação dolorosa na ausência de patologia pélvica é uma condição comum e muitas vezes debilitante considerada uma das queixas mais frequentes no dia-a-dia da clínica ginecológica, afetando entre 45 e 95% das mulheres que menstruam. Não há consenso na literatura sobre os limiares experimentais dessas mulheres. Na dor pélvica crônica, a diminuição dos limiares sensitivo e doloroso estão associados aos quadros de sensibilização central e hiperalgesia, necessitando de tratamento focado nesse quadro sindrômico. Se os limiares dolorosos das mulheres com dismenorreia seguirem um padrão compatível como o encontrado em mulheres com dor pélvica crônica, poderemos melhorar o tratamento dessas pacientes, abordando também as alterações neuroplásticas e do humor. Objetivo primário: Avaliar os limiares experimentais de voluntárias portadoras de dismenorreia primária moderada ou grave. Métodos e Procedimentos: Na entrevista, as participantes foram submetidas a uma avaliação psicométrica com as escalas EVA (escala visual analógica de dor), Questionário de McGill (analisa várias dimensões da dor), Escala de Ansiedade e Depressão para Hospital Geral (HAD), avaliação sócio-demográfica, antropométrica e ainda um questionário relacionado ao ciclo menstrual em geral, abordando ainda questões relacionadas a história familiar, absenteísmo no trabalho ou escola, uso e eficiência medicamentosa, prática e frequência de atividade física, entre outras. Em seguida, foram analisados os limiares sensitivo e doloroso através do aparelho de eletroestimulação nervosa transcutânea TENS e o limiar doloroso por meio de pressão transcutânea, algômetro. Resultados: Participaram do estudo 48 voluntárias divididas em dois grupos: Grupo Estudo, composto por 24 mulheres (com dismenorreia primária moderada ou grave) e o Grupo Controle composto por 24 mulheres (sem dismenorreia ou com dismenorreia primária leve). A mediana do limiar doloroso obtido através da estimulação nervosa transcutânea foi de 10,11mA no grupo de estudo e 11,92mA no grupo controle e na algometria de 1,86kg/cm² e 2,28kg/cm² respectivamente. Entre as mulheres com dismenorreia primária moderada ou grave 70 % relataram que a mãe ou irmã já sofreram ou sofrem de cólicas menstruais, 70 % não praticam nenhum tipo de atividade física, 58,3%possui algum grau de ansiedade pelo HAD e 12,5% de depressão pelo HAD, 87,5% fazem uso de medicação para dor durante o período menstrual e 33,3% faltaram de suas atividades nos últimos três meses devido a dismenorreia.Primary dysmenorrhea or painful menstruation in the absence of pelvic pathology is a common condition and often debilitating considered one of the most frequent complaints in day-to-day gynecologic practice, affecting between 45 and 95% of menstruating women. There is no consensus in the literature on the experimental thresholds of these women In chronic pelvic pain, decreased sensory and pain thresholds are associated with the frames of central sensitization and hyperalgesia, requiring treatment focused on this syndromic. If the painful threshold of women with dysmenorrhea follow a pattern consistent as found in women with chronic pelvic pain, we can improve the treatment of these patients also addressing the neuroplastic and mood changes. Specific Objective: Evaluate voluntary experimental thresholds with moderate or severe primary dysmenorrhea. Methods and Procedures: In the interview, participants were subjected to psychometric assessment to the VAS scales (visual analog pain scale), McGill Questionnaire (analyzes various dimensions of pain), Anxiety Scale and Depression for General Hospital (HAD), socio-demographic, antropometric assessment and also a questionnaire related to the menstrual cycle in general, adressing issues related to family history, absenteeism at work or school, use and drug efficiency, practice and frequency of physical activity, among others. Then the sensitive and painful thresholds were analyzed through transcutaneous electrical nerve stimulation TENS device and the pain threshold through transcutaneous pressure algometer. Results: The study included 48 volunteers divided into two groups: Study Group, composed of 24 women (with moderate or severe primary dysmenorrhea), the control group composed of 24 women (no or mild dysmenorrhea primary dysmenorrhea). The median pain threshold obtained by transcutaneous nerve stimulation was 10,11mA corresponding to the study group and the control group 11,92mA and algometry of 1,86kg / cm² and 2,28kg / cm² respectively. Among women with moderate or severe primary dysmenorrhea 70 % reported that the mother or sister have suffered or are suffering from menstrual cramps, 70 % do not practice any physical activity, 58.3 % have some degree of anxiety by the HAD and 12.5 % of depression by the HAD, 87.5 % make use of medication for pain during the menstrual period and 33.3 % missed their activities in the last three months because of dysmenorrheal.
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Ishak, Wan Syafira. "Sensitised audiological measures of auditory dysfunction in tinnitus patients with normal hearing thresholds". Thesis, University of Bristol, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.556726.
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Substantial evidences show that tinnitus is associated with hearing loss. However, approximately 10% of tinnitus patients attending an ENT/Audiology clinic for their problems have hearing within normal audiometric thresholds. The general consensus on the roles of hearing loss in triggering tinnitus seems not applicable in this minority group. The absence of any grossly abnormal audiometric findings to explain their tinnitus leaves the clinician with a diagnostic dilemma and presents difficulties in dealing with the patients. The aim of this study was therefore to scrutinize auditory functioning in a sample of tinnitus subjects with normal hearing thresholds and non-tinnitus normally hearing control participants. Five tests were applied: Audioscan, Transient Evoked Otoacoustic Emission (TEOAE), Distortion Product Otoacoustic Emission (DPOAE), Threshold Equalising Noise (TEN) test and Contralateral Suppression of TEOAE (CSTEOAE). Optimal parameters for these tests have been defined and subsequently used to detect subtle auditory deficit in tinnitus patients with normal hearing thresholds. Twenty-seven tinnitus patients with hearing thresholds within normal limit participated in this study. A total of 27 non-tinnitus volunteers with similar thresholds were recruited as controls. Significant more Audioscan notches were found in tinnitus patients than in controls, particularly at 3001 to 8000 Hz region. Moreover, abnormal TEOAE was significantly more in tinnitus patients than in controls. No significant difference was observed in DPOAE, TEN and CSTEOAE test. Only one patient was found with abnormal TEN test and no TEOAE suppression, which led to the discovery of a large vestibular schwannoma. VI In summary, these results confirm the possible existence of subtle auditory deficit in tinnitus patients with normal hearing thresholds. However, combination of cochlear and retrocochlear abnormality may also possible. The presence of tinnitus without concomitant hearing loss in this group suggests that it may be an early sign of diseases that are only diagnosed after the onset of hearing loss.
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Alazemi, Abdulrahman. "Investigation of Factors in Triplet-Triplet Annihilation Upconversion". University of Cincinnati / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1521189118425574.
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Siviero, Mariana. "Avaliação sensitiva orofacial, gustativa, olfativa e salivar em doentes com neuralgias trigeminais". Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/5/5138/tde-19122011-120643/.
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Neuralgia pós-herpética trigeminal (NPH), neuralgia idiopática do trigêmeo (NIT) e síndrome da ardência bucal (SAB) são doenças neuropáticas da face, caracterizadas por dor na ausência de sinais que evidenciem a causas. Este estudo teve por objetivos determinar as características sensitivas, olfativas, gustativas e salivares em doentes com NPH, NIT e SAB comparados a controles. Foram avaliados 20 doentes de cada grupo, diagnosticados de acordo com critérios da International Association for the Study of Pain (IASP), e 60 indivíduos saudáveis, através de um protocolo sistematizado que incluiu os seguintes testes quantitativos sensitivos: limiares térmicos (frio e calor), limiares mecânicos tácteis, limiares dolorosos de superfície, limiares gustativos (doce, azedo, salgado e amargo), limiares olfativos e fluxo salivar. Os testes foram realizados no território de inervação trigeminal. Os dados foram analisados através dos testes estatísticos ANOVA 1 fator, Tukey, Kruskal-Wallis e Dunn, e o nível de significância foi de 5%. Os limiares térmicos de frio foram diferentes (maiores) somente no ramo mandibular dos doentes com NPH (p=0,001) e os limiares térmicos de calor foram diferentes (maiores) em todos os ramos trigeminais nos doentes com NPH e SAB (p=0,001); a sensibilidade mecânica táctil estava alterada no ramo mandibular de doentes com NPH (p=0,001) e em todos os ramos trigeminais dos doentes com SAB (p= 0,001; p=0,004 e p=0,001); os limiares gustativos salgado e doce, além do limiar olfativo, foram maiores em todos os doentes quando comparados aos controles (p=0,004; p=0,001 e p=0,0389); o sabor ácido obteve os menores limiares e não foram encontradas diferenças para a identificação do sabor amargo ou na avaliação salivar quantitativa (p=0,1694 e p=0,001). Este estudo apresentou evidências de anormalidades sensitivas nos doentes com dor neuropática trigeminal, tanto somestésicas como gustativas e olfativas. A sensibilidade somatosensitiva apresentou-se mais alterada nos doentes com NPH e SAB quando comparados a NIT e aos controles. Mecanismos periféricos e centrais relacionados à percepção e modulação sensitiva podem estar envolvidos na fisiopatologia dos achados aqui observadosTrigeminal postherpetic neuralgia (PHN), idiopathic trigeminal neuralgia (ITN) and burning mouth syndrome (BMS) are painful neuropathies with no clear signs about their causes. The objectives of this study were to determine somatosensory, olfactory, gustative and salivary characteristics of patients with PHN, ITN and BMS compared to controls. Twenty patients from each group, diagnosed according to the criteria from the International Association for the Study of Pain (IASP), and 60 healthy controls were evaluated with a systematized quantitative approach which included thermal (cold and warm), mechanical (tactile), pain, gustative (sweet, sour, salty and bitter) and olfactory thresholds, and quantitative salivary flow evaluation. Data were analyzed with ANOVA 1 factor, Tukey, Kruskal-Wallis and Dunn tests with a level of significance of 5%. Thermal thresholds for cold were different (higher) only in the mandibular branch of patients with PHN (p=0.001) and warm thresholds were higher in all trigeminal branches of PHN and BMS (p=0,001); tactile mechanical sensitivity was altered at the mandibular branch of PHN (p=0,001) and in all trigeminal branches of BMS (p= 0,001; p=0,004 e p=0,001). The salty, sweet and olfactory thresholds were higher in all studied groups (p=0,004; p=0,001 e p=0,0389); the sour threshold was lower and there were no differences in bitter taste or salivary flow (p=0,1694 e p=0,001). This study showed evidences of somatosensory, gustative and olfactory abnormalities in patients with neuropathic orofacial pain. Somatosensory findings were discrete in ITN and more common in PHN and BMS. Peripheral and central mechanisms of perception and modulation could be involved in the physiopathology of these findings
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Carvalho, Viviane Fernandes de. "Avaliação da sensibilidade cutânea em pés de pacientes diabéticos através do Pressure Specified Sensory Device TM". Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/5/5158/tde-29052008-112413/.
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A neuropatia diabética causa diminuição ou perda da sensibilidade protetora do pé, tornando-o mais vulnerável ao trauma mecânico e térmico. A profilaxia das complicações neuropáticas tem início pela identificação da perda de sensibilidade e, portanto, do comprometimento neurológico. O Pressure Specified Sensory Device(TM) (PSSD) é um equipamento desenvolvido para quantificar o limiar de pressão, aplicada sobre a pele, necessária para que o paciente perceba o estímulo provocado por: um ponto estático, um ponto em movimento, dois pontos estáticos e dois pontos em movimento. Denominamos grupo estudo, aos trinta e quatro pacientes diabéticos do tipo 2, sem história prévia de feridas e/ou amputações nos pés que foram submetidos à avaliação de sensibilidade cutânea utilizando-se o PSSD(TM). Foram realizados testes nos territórios cutâneos dos nervos fibular profundo, plantar medial e ramo calcâneo do nervo tibial posterior. Estímulos foram provocados segundo as modalidades: um ponto estático (1 PE), um ponto em movimento (1 PD), dois pontos estáticos (2 PE) e dois pontos em movimento (2 PD), para as duas últimas modalidades. Previamente às modalidades 2PE e 2PD determinou-se o limiar de discriminação entre dois pontos estáticos (D2PE) e em movimento (D2PD). Foram realizados apenas no grupo estudo, testes com o monofilamento de Semmes-Weisntein nº 5,07 (MSW) e com o diapasão de 128 Hz. Vinte e oito pacientes não-diabéticos, submetidos aos mesmos testes, formaram o grupo controle. Para os limiares de sensibilidade, encontramos valores superiores no grupo estudo (p < 0,05). Ao compararmos os limiares de sensibilidade alcançados pelos pacientes diabéticos sensíveis e não sensíveis ao estímulo promovido pelo MSW nº 5,07 verificamos que o p-valor variou entre 0,018 < p < 0,113 para 1 PE e 0,002 < p < 0,083 para 2 PE, conforme o território cutâneo estudado. Na comparação dos limiares de sensibilidade da modalidade 1 PD entre diabéticos sensíveis e insensíveis à vibração do diapasão de 128 Hz, as diferenças não foram estatisticamente significantes (p = 0,183). Os resultados obtidos nos permitiram sugerir que o dispositivo PSSD(TM) seja utilizado como forma de acompanhamento do comprometimento da fibra nervosa.Neuropathy is a severe progressive loss of protective sensation on the feet, making the patient more vulnerable to mechanical trauma and consequently more suitable to the development of chronic wounds, major distortion of the foot bone architecture and eventually to limb amputation. Prophylaxis should be enforced to avoid foot ulceration and for that, evaluation of the degree of loss of sensation on the skin is essential. The PSSD (Pressure Specified Sensory Device(TM)) was developed in order to quantify the threshold of pressure applied to the skin that could be recognized as positive by the patient. Pressure of one or two points is tested both statically and with movement, thus assessing the function of fast and slow response nerve fibers. Threshold of two-point discrimination was also measured in mm. Thirty four (n = 34) diabetic patients, type II, with no previous history of wounds on the lower extremity were studied using the tests, one point static (1PE), one point moving (1PD) and two points static (2 PE), and moving (2 PD) on the cutaneous territory of the fibular nerve and posterior tibial nerve (two territories - medial plantar and calcaneous nerves). The control group (28 non diabetic patients) was assessed by the same exams and the results were compared. In the diabetic group the cutaneous territories were also evaluated using the conventional Semmes-Weinstein filament nº 5,07 e vibrometer of the 128 Hz. Altered values were observed for the static and dynamic tests over the three studied nerve territories. The differences were statically significant (p < 0,05). Comparing the threshold of sensibility between sensitive and non sensitive diabetic patients to MSW nº 5,07 test, we observed that p-value range was 0,018 0,113 when 1PE test was applied, and 0,002 0,083 when 2PE test was applied, according to the cutaneous territories evaluated. Numeric quantification of the threshold of pressure allows us to determine the status of the fiber/receptor structures as well as the functional deficit of nerve fibers. Our findings suggest that PSSD(TM) is an adjuvant tool to evaluate the degree of loss of sensation on the skin.
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KAUSHIK, AMIT KUMAR. "THRESHOLD SENSITIVE ADVANCED DEEC ROUTING PROTOCOL FOR WIRELESS SENSOR NETWORKS (WSNS)". Thesis, 2014. http://dspace.dtu.ac.in:8080/jspui/handle/repository/15595.
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Wireless Sensor Network (WSN) is a kind of self-configuring network composed of a set of
wireless sensor nodes (also called motes). The lifetime of WSN is limited because the sensor
node works on battery life and it is hard to recharge the battery at regular basis because of the
deployment of wireless sensor network in remote and hostile places. In order to prolong the
network lifetime, a network routing protocol with high energy efficiency is necessary besides
designing low-power sensor nodes. In Wireless sensor networks, several routing protocols have
been developed to improve the various parameters such as stability period, throughput etc.
Several Homogenous and heterogeneous Routing protocols were discovered in the domain of
Wireless sensor networks. The homogenous network has all nodes of same energy and
heterogeneous has nodes of different energies. But studies have shown that heterogeneous
protocols are better to prolong the lifetime of the network. A clustering based homogenous
protocol Low energy adaptive Clustering hierarchical (LEACH) gave a basic clustering approach
to make efficient protocol for routing. After this many heterogeneous protocols were explored
which successfully improved the throughput, lifetime etc of wireless sensor network. In this
research the heterogeneous protocol, Distributed Energy efficient Clustering(DEEC),its
enhanced Version EhancedDEEC(EDEEC) and their further improvements have been explored
and have made them more efficient further by
advanced distributed energy efficient clustering (DEEC) routing protocol for wireless sensor
new node superadvanced node in addition to normal,
advanced and super nodes as in EDEEC is taken to increase the stability period and longevity of
the network. As energy cost is more in term of transmission of data than processing data in the
nodes, so to optimize the transmission, reactive routing protocol TEEN is applied in this
research. This saves a lot of energy and makes transmission better in terms of throughput,
longevity of the network etc. This research has been simulated in matlab and successfully
outperformed the LEACH, DEEC and EDEEC in terms of alive nodes, dead nodes and
throughput.
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Tigga, Anjali Priyanka. "Genetic Algorithm Based Threshold Sensitive Routing Protocol for Wireless Sensor Network". Thesis, 2015. http://ethesis.nitrkl.ac.in/7788/1/2015_Genetic_Tigga.pdf.
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Wireless sensor network (WSN) is an advancing technological field of wireless communication with a wide range of applications. It comprises of geographically wide-spread unattended micro-sensors. Such autonomous characteristics of nodes have led to design of various routing protocols which encounter performance augmentation with respect to energy efficiency and network lifetime. Design of routing protocols is highly contingent on the application which uses it. However, hierarchical cluster-based structure is ascertained to yield considerable potential. Rooted from it is the widely known cluster-based LEACH protocol. Considerable contribution is also done in protocols based upon genetic algorithms such as ERP and HCR. They tend to extend network lifetime but are liable to attainable modifications which can direct to better performances. The aim of this paper is to acquire effective fitness function to construct clusters efficiently which can operate with high stability and attain low energy dissipation over the rounds of transmission. Another moderation is the route configuration for aggregated data to be transmitted along the cluster heads only. Simulation and comparison with LEACH, TEEN and ERP shows that GA-TSRP is significantly stable for a number of transmission rounds. And thus, energy utilized is spread uniformly over an adequate duration of sensor network lifetime.
Książki na temat "THRESHOLD SENSITIVE"
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Whalen, Timothy. Probabilistic estimates of design load factors for wind-sensitive structures using the "peaks over threshold" approach. Gaithersburg, MD: U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 1996.
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National Institute of Standards and Technology (U.S.), red. Probabilistic estimates of design load factors for wind-sensitive structures using the "peaks over threshold" approach. Gaithersburg, MD: U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 1996.
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Whalen, Timothy. Probabilistic estimates of design load factors for wind-sensitive structures using the "peaks over threshold" approach. Gaithersburg, MD: U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 1996.
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Hanna, Jason. Paternalism and Moderate Deontology. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780190877132.003.0005.
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This chapter attempts to situate pro-paternalism within a moderate deontological moral theory. According to moderate deontologists such as Judith Jarvis Thomson, moral rights have thresholds beyond which they can be permissibly infringed. According to one plausible way of developing this view, a right has a threshold of zero when its infringement would benefit the right-bearer. If so, then beneficial paternalistic intervention may be permissible even if it infringes rights. After developing this argument, the chapter considers several possible anti-paternalist replies, including the suggestion that rights thresholds are sensitive to the value of autonomy. It is argued that each reply either has implausible implications or is unlikely to support common anti-paternalist judgments about cases.
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Brown, Jessica. Fallibilism: Evidence and Knowledge. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198801771.001.0001.
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This book examines the prospects for infallibilism about knowledge, according to which one can know that p only if one has evidence which guarantees or entails that p. In particular, it focuses on the possibility of a non-sceptical infallibilism which rejects any kind of shifty view of knowledge, whether contextualist, relativist, or subject-sensitive invariantist. The availability of a non-shifty non-sceptical infallibilism seems to depend on whether such a view can defend a generous enough conception of evidence to allow us to have the knowledge we ordinarily take ourselves to have. In particular, such an infallibilist needs to allow that our evidence extends well beyond how things seem to us in our experience and includes claims about the external world. Thus, the infallibilism which is the focus of this book is committed to a generous conception of evidence. More precisely, I argue that infallibilism is committed to the following claims about evidence and evidential support: if p is evidence, then p is true; and if one knows that p, then p is part of one’s evidence, and p is evidence for p. However, I argue that these claims about evidence and evidential support are problematic. Furthermore, I argue that fallibilism can overcome the most serious objections levelled at it, which concern closure, concessive knowledge attributions, practical reasoning, and the threshold problem. So, I conclude that epistemologists who aim to avoid both scepticism and a shifty view of knowledge should be fallibilists.
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Hood, Christopher, i Rozana Himaz. UK Fiscal Squeezes over a Century. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198779612.003.0002.
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This chapter draws on historical statistics reporting financial outcomes for spending, taxation, debt, and deficit for the UK over a century to (a) identify quantitatively and compare the main fiscal squeeze episodes (i.e. major revenue increases, spending cuts, or both) in terms of type (soft squeezes and hard squeezes, spending squeezes, and revenue squeezes), depth, and length; (b) compare these periods of austerity against measures of fiscal consolidation in terms of deficit reduction; and (c) identify economic and financial conditions before and after the various squeezes. It explores the extent to which the identification of squeeze episodes and their classification is sensitive to which thresholds are set and what data sources are used. The chapter identifies major changes over time that emerge from this analysis over the changing depth and types of squeeze.
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Wainger, Brian J. Drug Discovery and Neuropathic Pain. Oxford University Press, 2017. http://dx.doi.org/10.1093/med/9780199937837.003.0117.
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Pain is one of the most common causes of physician visits and disability. Pain has been classified into specific subtypes. We refer to baseline or nociceptive pain as pain that results from an ongoing, high-threshold stimulus acting on an unenhanced somatosensory system. Inflammatory pain refers to pain in the setting of tissue damage and specifically the release of inflammatory molecules that activate and sensitize the nociceptive machinery. Hyperalgesia, or increased pain in response to a noxious stimulus, results from nociceptor sensitization whereas neuropathic pain results from a lesion or disease of the somatosensory system. Pain can have spontaneous, stimulus-independent components as well as evoked components such as hyperalgesia or allodynia, pain that is elicited by a normally innocuous stimulus. This chapter describes the research strategy for discovering new drugs to relieve these different kinds of pain.
Części książek na temat "THRESHOLD SENSITIVE"
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Barut, Silvere. "Sensitive Coating Solutions to Lower BVID Threshold on Composite Structure". W Smart Intelligent Aircraft Structures (SARISTU), 745–51. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-22413-8_37.
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Dill, Kilian. "Sensitive Analyte Detection and Quantitation Using the Threshold Immunoassay System". W ACS Symposium Series, 89–102. Washington, DC: American Chemical Society, 1996. http://dx.doi.org/10.1021/bk-1996-0646.ch009.
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Krawczyk, Bartosz, i Michał Woźniak. "Cost-Sensitive Neural Network with ROC-Based Moving Threshold for Imbalanced Classification". W Intelligent Data Engineering and Automated Learning – IDEAL 2015, 45–52. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-24834-9_6.
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Shreekant, K., Parth Sharma, Sindhu Hak i Shuchismita Pani. "Threshold Sensitive Modified Leach Protocol for Energy Saving in Wireless Sensor Network". W Advances in Intelligent Systems and Computing, 1207–13. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-5903-2_126.
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Rani, Richa, Deepti Kakkar, Parveen Kakkar i Ashish Raman. "Distance Based Enhanced Threshold Sensitive Stable Election Routing Protocol for Heterogeneous Wireless Sensor Network". W Computational Intelligence in Sensor Networks, 101–22. Berlin, Heidelberg: Springer Berlin Heidelberg, 2018. http://dx.doi.org/10.1007/978-3-662-57277-1_5.
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Ma, Jinyu, Shubin Wang i Yanhong Ge. "Ant-Colony Based Double Cluster Heads Adaptive Periodic Threshold-Sensitive Energy Efficient Network Protocol in WSN". W Lecture Notes in Electrical Engineering, 309–17. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-3229-5_34.
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Lobo, Armindo, Pedro Oliveira, Paulo Sampaio i Paulo Novais. "Cost-Sensitive Learning and Threshold-Moving Approach to Improve Industrial Lots Release Process on Imbalanced Datasets". W Distributed Computing and Artificial Intelligence, 19th International Conference, 280–90. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-20859-1_28.
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Mauermann, M., S. J. Heise, J. L. Verhey i B. Kollmeier. "Is fine structure in hearing threshold an indicator of a highly sensitive cochlea? Investigations on amplitude modulation detection". W IFMBE Proceedings, 25–28. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-03891-4_7.
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Janani, B., i M. Lakshmi Priya. "Time-Sensitive Probabilities of an $${\varvec{M}}/{\varvec{M}}/1$$ Queueing Model with Semi-Vacation and Threshold Policy". W Advances in Intelligent Systems and Computing, 615–26. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-4389-4_56.
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Iannaccone, A., E. M. Vingolo, R. Forte, P. Tanzilli, B. Grammatico, C. De Bernardo, E. Rispoli, G. Del Porto i M. R. Pannarale. "Scotopic Threshold Responses and Rod Intensity-Response Functions as Sensitive Indicators of the Carrier Status In X-Linked Recessive Retinitis Pigmentosa". W Degenerative Diseases of the Retina, 371–76. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4615-1897-6_41.
Pełny tekst źródłaStreszczenia konferencji na temat "THRESHOLD SENSITIVE"
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Mori, Allan, Gustavo Vale, Elder Cirilo i Eduardo Figueiredo. "A Domain-Sensitive Threshold Derivation Method". W SBSI'19: XV Brazilian Symposium on Information Systems. New York, NY, USA: ACM, 2019. http://dx.doi.org/10.1145/3330204.3330252.
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Kashaf, A., N. Javaid, Z. A. Khan i I. A. Khan. "TSEP: Threshold-Sensitive Stable Election Protocol for WSNs". W 2012 10th International Conference on Frontiers of Information Technology (FIT 2012). IEEE, 2012. http://dx.doi.org/10.1109/fit.2012.37.
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Alharthi, Saad A., i Princy A. Johnson. "Threshold sensitive heterogeneous LEACH protocol for wireless sensor networks". W 2016 24th Telecommunications Forum (TELFOR). IEEE, 2016. http://dx.doi.org/10.1109/telfor.2016.7818743.
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Chodorek, Agnieszka, i Robert Ryszard Chodorek. "TFD-assisted Threshold–sensitive Stable Election Protocol for WSNs". W 2022 27th Asia Pacific Conference on Communications (APCC). IEEE, 2022. http://dx.doi.org/10.1109/apcc55198.2022.9943774.
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Maurya, Sonam, i Vinod Kumar Jain. "Threshold Sensitive Region-Based Hybrid Routing protocol for precision agriculture". W 2016 IEEE Wireless Communications and Networking Conference Workshops (WCNCW). IEEE, 2016. http://dx.doi.org/10.1109/wcncw.2016.7552694.
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Maurya, Sonam, i Vinod Kumar Jain. "Threshold sensitive region-based hybrid routing protocol for precision agriculture". W 2016 IEEE Wireless Communications and Networking Conference (WCNC). IEEE, 2016. http://dx.doi.org/10.1109/wcnc.2016.7564665.
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Rizwan, Muhammad, Muhammad S. Nisar i Hongbo Jiang. "TMEEP: Threshold-sensitive based Multihop Energy Efficient Protocol for HWSN". W 2016 6th International Conference on Machinery, Materials, Environment, Biotechnology and Computer. Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/mmebc-16.2016.318.
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Raza, W., I. Khan, F. Arshad, I. Naqvi, U. Qasim, Z. A. Khan i N. Javai. "THEEM: Threshold-Sensitive Energy Efficient Multi-hop Routing Protocol for WSNs". W 2014 Ninth International Conference on Broadband and Wireless Computing, Communication and Applications (BWCCA). IEEE, 2014. http://dx.doi.org/10.1109/bwcca.2014.40.
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Roseline, R. A., i P. Sumathi. "Local clustering and threshold sensitive routing algorithm for Wireless Sensor Networks". W 2012 International Conference on Devices, Circuits and Systems (ICDCS 2012). IEEE, 2012. http://dx.doi.org/10.1109/icdcsyst.2012.6188748.
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Hou, Ya-Rong, i Yong Wang. "A dynamic threshold-based packet scheduling scheme for Qos sensitive applications". W 2011 International Conference on Mechatronic Science, Electric Engineering and Computer (MEC). IEEE, 2011. http://dx.doi.org/10.1109/mec.2011.6025454.
Pełny tekst źródłaRaporty organizacyjne na temat "THRESHOLD SENSITIVE"
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Whalen, Timothy M. Probabilistic estimates of design load factors for wind-sensitive structures using the Peaks over threshold approach. Gaithersburg, MD: National Bureau of Standards, 1996. http://dx.doi.org/10.6028/nist.tn.1418.
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Firon, Nurit, Prem Chourey, Etan Pressman, Allen Hartwell i Kenneth J. Boote. Molecular Identification and Characterization of Heat-Stress-Responsive Microgametogenesis Genes in Tomato and Sorghum - A Feasibility Study. United States Department of Agriculture, październik 2007. http://dx.doi.org/10.32747/2007.7591741.bard.
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Exposure to higher than optimal temperatures - heat-stress (HS) - is becoming increasingly common to all crop plants worldwide. Heat stress coinciding with microgametogenesis, especially during the post-meiotic phase that is marked by starch biosynthesis, is often associated with starch-deficient pollen and male sterility and ultimately, greatly reduced crop yields. The molecular basis for the high sensitivity of developing pollen grains, on one hand, and factors involved in pollen heat-tolerance, on the other, is poorly understood. The long-term goal of this project is to provide a better understanding of the genes that control pollen quality under heat-stress conditions. The specific objectives of this project were: (1) Determination of the threshold heat stress temperature(s) that affects tomato and sorghum pollen quality whether: a) Chronic mild heat stress conditions (CMHS), or b) Acute heat stress (AHS). (2) Isolation of heat-responsive, microgametogenesis-specific sequences. During our one-year feasibility project, we have accomplished the proposed objectives as follows: Objectrive 1: We have determined the threshold HS conditions in tomato and sorghum. This was essential for achieving the 2nd objective, since our accumulated experience (both Israeli and US labs) indicate that when temperature is raised too high above "threshold HS levels" it may cause massive death of the developing pollen grains. Above-threshold conditions have additional major disadvantages including the "noise" caused by induced expression of genes involved in cell death and masking of the differences between heatsensitive and heat-tolerant pollen grains. Two different types of HS conditions were determined: a) Season-long CMHS conditions: 32/26°C day/night temperatures confirmed in tomato and 36/26°C day maximum/night minimum temperatures in sorghum. b) Short-term AHS: In tomato, 2 hour exposure to 42-45°C (at 7 to 3 days before anthesis) followed by transfer to 28/22±2oC day/night temperatures until flower opening and pollen maturation, caused 50% reduced germinating pollen in the heat-sensitive 3017 cv.. In sorghum, 36/26°C day/night temperatures 10 to 5 days prior to panicle emergence, occurring at 35 days after sowing (DAS) in cv. DeKalb28E, produced starch-deficient and sterile pollen. Objective 2: We have established protocols for the high throughput transcriptomic approach, cDNA-AFLP, for identifying and isolating genes exhibiting differential expression in developing microspores exposed to either ambient or HS conditions and created a databank of HS-responsivemicrogametogenesis-expressed genes. A subset of differentially displayed Transcript-Derived Fragments (TDFs) that were cloned and sequenced (35 & 23 TDFs in tomato and sorghum, respectively) show close sequence similarities with metabolic genes, genes involved in regulation of carbohydrate metabolism, genes implicated in thermotolerance (heat shock proteins), genes involved in long chain fatty acids elongation, genes involved in proteolysis, in oxidation-reduction, vesicle-mediated transport, cell division and transcription factors. T-DNA-tagged Arabidopsis mutants for part of these genes were obtained to be used for their functional analysis. These studies are planned for a continuation project. Following functional analyses of these genes under HS – a valuable resource of genes, engaged in the HS-response of developing pollen grains, that could be modulated for the improvement of pollen quality under HS in both dicots and monocots and/or used to look for natural variability of such genes for selecting heat-tolerant germplasm - is expected.
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Chen, Weixing. PR378-173601-Z01 Effect of Pressure Fluctuations on the Growth Rate of Near-Neutral pH SCC. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), lipiec 2021. http://dx.doi.org/10.55274/r0012112.
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This report summarizes the work completed in PRCI SCC-2-12A project: The Effect of Pressure Fluctuations on the Growth Rate of Near-Neutral pH SCC, which is Phase 3 of the work on the same subject of investigation. The following insights from the current phase of the PRCI SCC-2-12A project are thought to be the most important: - Near neutral pH crack initiation is pressure-fluctuation dependent. Severe pressure fluctuations accelerate the fracture and spallation of mill scale on the pipeline steel surfaces, making it harder to initiate SCC cracks from the bottom of pits that are developed at flawed mill scale sites. On the other hand, the presence of a primer layer before application of the protective coating preserves the mill scale on the pipe steel surface and promotes crack initiation. - The early-stage crack growth primarily features crack length extension on the pipe surface but limited crack growth in the depth direction. Three different mechanisms of crack length extension have been identified, including that determined by the geometry of coating disbondment, a chaotic process of crack coalescence, and the ability of existing cracks to induce further crack initiation and growth. This latter process is pressure-fluctuation sensitive. - A complete set of equations governing crack growth in Stage 2 has been established based on experimental specimens with surface cracks under mechanical loading conditions realistic to pressure fluctuations during the operation of oil and gas pipelines. - The contribution to crack growth by direct dissolution of the steel at the crack tip has been determined, which has been found to be crack depth-dependent and pressure-fluctuation-sensitive. Gas pipelines operated under high mean pressure show higher rates of dissolution. - The severity of crack growth and the accuracy of the predictive model can be significantly affected by crack tip morphology, either sharp or blunt, and this would yield different threshold values for Stage 2 crack growth and therefore different lengths of remaining life. - Full scale testing was performed and has validated the crack growth models contained herein. - The PipeOnline software has been revised to incorporate the new experimental results obtained from the current PRCI SCC 2-12A project. This PipeOnline software was previously developed from the two earlier phases of the PRCI project.
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Tanaka, Eri, Regina Schwerd, Wolfgang Hofbauer i Daniel Zirkelbach. Laboratory tests on decay of natural fibre insulation materials suggest a more differentiated evaluation and higher RH thresholds. Department of the Built Environment, 2023. http://dx.doi.org/10.54337/aau541651346.
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To reduce CO2 emissions and save grey energy, natural materials like wood and wooden materials are becoming more and more important. However, these products are particularly sensitive to moisture, as they can be attacked by mould or decay fungi. In contrast to mould growth, which typically is associated with visual impairment and health problems, the growth of decay fungi may result in structural defects which clearly must be excluded. Up to now it is mostly assumed that wooden materials are more sensitive to such attack than solid wood. Therefore, different wood fibre insulation materials were inoculated with decay fungi and exposed to different climates to determine the requirements for the decay process and to compare them with the requirements of decay by the same fungi of solid wood. The results prove that some natural fibre materials are equally or even more resistant to decay fungi than solid wood, while others are less. The resistant products can therefore be assessed like solid wood – for which already temperature dependent thresholds and in part also transient decay prediction models are available. Maybe even specific higher moisture levels can be acceptable. However, the results also suggest a differentiated view on natural fibre insulations, as they have a very different susceptibility to wood decay. Uniform and significantly lower limits than for solid wood are not justified.
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Davies, Will. Improving the engagement of UK armed forces overseas. Royal Institute of International Affairs, styczeń 2022. http://dx.doi.org/10.55317/9781784135010.
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The UK government’s Integrated Review of security, defence, development and foreign policy, published in March 2021 alongside a supporting defence command paper, set a new course for UK national security and highlighted opportunities for an innovative approach to international engagement activity. The Integrated Review focused principally on the state threats posed by China’s increasing power and by competitors – including Russia – armed with nuclear, conventional and hybrid capabilities. It also stressed the continuing risks to global security and resilience due to conflict and instability in weakened and failed states. These threats have the potential to increase poverty and inequality, violent extremism, climate degradation and the forced displacement of people, while presenting authoritarian competitors with opportunities to enhance their geopolitical influence. There are moral, security and economic motives to foster durable peace in conflict-prone and weakened regions through a peacebuilding approach that promotes good governance, addresses the root causes of conflict and prevents violence, while denying opportunities to state competitors. The recent withdrawal from Afghanistan serves to emphasize the complexities and potential pitfalls associated with intervention operations in complex, unstable regions. Success in the future will require the full, sustained and coordinated integration of national, allied and regional levers of power underpinned by a sophisticated understanding of the operating environment. The UK armed forces, with their considerable resources and global network, will contribute to this effort through ‘persistent engagement’. This is a new approach to overseas operations below the threshold of conflict, designed as a pre-emptive complement to warfighting. To achieve this, the UK Ministry of Defence (MOD) must develop a capability that can operate effectively in weak, unstable and complex regions prone to violent conflict and crises, not least in the regions on the eastern and southern flanks of the Euro-Atlantic area. The first step must be the development of a cohort of military personnel with enhanced, tailored levels of knowledge, skills and experience. Engagement roles must be filled by operators with specialist knowledge, skills and experience forged beyond the mainstream discipline of combat and warfighting. Only then will individuals develop a genuinely sophisticated understanding of complex, politically driven and sensitive operating environments and be able to infuse the design and delivery of international activities with practical wisdom and insight. Engagement personnel need to be equipped with: An inherent understanding of the human and political dimensions of conflict, the underlying drivers such as inequality and scarcity, and the exacerbating factors such as climate change and migration; - A grounding in social sciences and conflict modelling in order to understand complex human terrain; - Regional expertise enabled by language skills, cultural intelligence and human networks; - Familiarity with a diverse range of partners, allies and local actors and their approaches; - Expertise in building partner capacity and applying defence capabilities to deliver stability and peace; - A grasp of emerging artificial intelligence technology as a tool to understand human terrain; - Reach and insight developed through ‘knowledge networks’ of external experts in academia, think-tanks and NGOs. Successful change will be dependent on strong and overt advocacy by the MOD’s senior leadership and a revised set of personnel policies and procedures for this cohort’s selection, education, training, career management, incentivization, sustainability and support.