Dissertations / Theses on the topic 'Single-station'
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Uwamahoro, Jean Claude. "Single station TEC modelling during storm conditions." Thesis, Rhodes University, 2016. http://hdl.handle.net/10962/d1020325.
Full textPimentel, Benjamin A. "Passive Geolocation in a 4G WIMAX Single Base Station Scenario." Thesis, Monterey, California. Naval Postgraduate School, 2003. http://hdl.handle.net/10945/53779.
Full textThe proliferation of Fourth Generation (4G) mobile wireless networks has led to an increased demand for position-based services. In many densely populated environments, there is an abundance of base stations by which a mobile station may be passively geographically located (geolocated) using various techniques that require multiple base stations. Areas in which base station density is sparse may not possess the requisite number of base stations to perform such techniques and, therefore, require different methods by which to geolocate mobile stations. In this thesis, we present a passive geolocation scheme that only requires observation of the initial ranging information exchange between a mobile station and a single base station in order to determine a position estimate for the mobile station. The scheme is specifically applied to the Institute of Electrical and Electronics Engineers (IEEE) 802.16 Worldwide Interoperability for Microwave Access (WiMAX) 4G standard. The method is validated through computer simulation and field experimentation in an Alcatel-Lucent IEEE 802.16e-2005 deployed network. The mean geolocation error resulting from simulation and experimentation was 85 meters, which is a degradation of 58 meters compared to a three-base station scenario.
Captain, United States Marine Corps
Hennig, Matthias, Henri Kirmse, and Klaus Janschek. "Global Localization of an Indoor Mobile Robot with a single Base Station." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-83687.
Full textSellers, Charles E. "Single Station Assessment of Atmospheric Boundary Layer Properties in the Eastern Mediterranean Sea." Thesis, Monterey, California. Naval Postgraduate School, 1985. http://hdl.handle.net/10945/41330.
Full textThe marine environment strongly affects the use of naval weapons and sensor systems. The ducting of electromagnetic energy is one of the most important influences in modern systems. The ability to describe the atmosphere is the first step in producing a realistic forecast. This study shows that in the eastern Mediterranean Sea the observed soundings appear to have a systematic error in the lower sections of the mixed layer. This, coupled with the synoptic scale changes in the atmosphere, causes single station forecasting scheme to fail. The thesis emphasizes two points: 1) the need for an accurate description of the atmosphere is paramount to any forecast. 2) the users of any single station forecast must use their knowledge of the models and compare the model results to the other information on hand to determine whether or not the prediction is reliable.
Hickey, Kenneth J. "Ocean surface current estimation using a long-range, single-station, high-frequency ground wave radar." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0008/MQ42394.pdf.
Full textFeldmeier, Joel W. "Sources of wind variability at a single station in complex terrain during tropical cyclone passage." Thesis, Monterey, California: Naval Postgraduate School, 2013. http://hdl.handle.net/10945/38926.
Full textAlthough Sasebo, Japans, harbor is usually a typhoon haven from tropical cyclone winds, due to terrain-blocking effects, in rare cases damaging winds occur that may be attributed to terrain channeling. Prediction techniques are developed and tested to improve forecast capability of maximum sustained winds and wind gusts that are the basis for tropical cyclone conditions of readiness. Verification observations from a site that was available during 19901998 were found to provide a false sense of security due to its urban location and 13 m anemometer height. Representing the Sasebo terrain effects with a large database of reanalysis winds had limited success unless the top 1000 wind speeds from each cardinal wind direction were used. A parametric wind model that utilized the JTWC wind radii to represent the wind profile shape resulted in better local wind prediction at Sasebo and a small, flat island, but demonstrated the requirement for a wind-reduction factor to represent frictional effects. This parametric wind model, which is multiplied by directionally-dependent acceleration factors to represent Sasebo terrain effects, was most successful for an independent sample of tropical cyclones passing within 200 nautical miles of Sasebo from 20112012 and for selected forecast case studies.
Koksal, Murat Miran. "Positioning Based On Tracking Of Signal Parameters In A Single Base Station Wimax Network Using Fingerprinting." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612248/index.pdf.
Full textBahrampouri, Mahdi. "Ground Motion Prediction Equations for Non-Spectral Parameters using the KiK-net Database." Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/87704.
Full textLindfeldt, Olov. "Quality on single-track railway lines with passenger traffic : Anlytical model for evaluation of crossing stations and partial double-tracks." Licentiate thesis, KTH, School of Architecture and the Built Environment (ABE), 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4560.
Full textRailway transportation is showing a substantial increase. Investments in new infrastructure, new fast and comfortable vehicles, and high frequency of service are important factors behind the increase.
Infrastructure configuration and timetable construction play important roles in the competitiveness of railway transportation. This is especially true on single-track lines where the travel times and other timetable related parameters are severely restricted by crossings (train meetings). The crossings also make the lines’ operation more sensitive to disturbances.
Since the major part of the Swedish railway network is single-track it is of great interest to examine the relationships between operation properties, such as travel times and reliability, and infrastructure configuration on single-track lines. The crossings are the core feature of single-track operation and this thesis focuses on the crossing time, i.e. the time loss that occurs in crossing situations.
A simplified analytical model, SAMFOST, has been developed to calculate the crossing time as a function of infrastructure configuration, vehicle properties, timetable and delays for two crossing trains. The effect of possible surrounding trains is not taken into account and all kinds of congestion effects are thus excluded from evaluation. SAMFOST has been successfully validated against the simulation tool RailSys, which shows that this type of simplified model is accurate in non-congested situations.
A great advantage of disregarding congested situations is that analysis is independent of timetable assumptions. The model also explicitly shows the effect of punctuality, which is of particular importance on single-track lines where the interdependencies between trains are strengthened by the crossings.
For the same reason, the timetable is severely constrained. Nonetheless, there is often a need for changes of the timetable (crossing pattern). The thesis proposes three simple measures of timetable flexibility, all based on assigned crossing time requirements. Together, these measures can be used to evaluate how infrastructure configuration, vehicle properties, punctuality etc affect possibilities to alter the timetable.
As an example of its application, SAMFOST has been used to evaluate the effect of shorter inter-station distance, partial double-track and combined crossing and passenger stop. These measures affect the operational properties quite differently.
More crossing stations result in a minor decrease in travel time (lower mean crossing time) but significantly higher reliability (lower crossing time variance). These effects are independent of punctuality, which is a valuable property.
A partial double-track results in shorter travel times and in some cases also higher reliability. Both effects are strongly dependent on punctuality and high punctuality is needed to achieve high effects.
A combined crossing and passenger stop results in a situation similar to that of a partial double-track. In this case it is important to point out that the assignment of time supplements in the timetable should be directly correlated to punctuality in order to achieve good operation.
Liu, Wenjiao. "Positioning performance of single-frequency GNSS receiver using Australian regional ionospheric corrections." Thesis, Queensland University of Technology, 2016. https://eprints.qut.edu.au/102335/1/Wenjiao_Liu_Thesis.pdf.
Full textKoehler, Jana [Verfasser]. "Studying large-scale structures and polarization of the Northern sky facilitating single-station data of the Low Frequency Array (LOFAR) / Jana Koehler." Bonn : Universitäts- und Landesbibliothek Bonn, 2016. http://d-nb.info/1113688378/34.
Full textAllenby, Patrick. "Enkelstations-RTK eller Nätverks-RTK : I Naturvårdsuppdrag." Thesis, Karlstads universitet, Institutionen för geografi, medier och kommunikation, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-33997.
Full textAndersson, Hanna-Mia, and Elinor Persson. "Kvalitetsutvärdering av höjdbestämning med GNSS-teknik : Variansanalys av enkelstations-RTK och nätverks-RTK." Thesis, Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-84689.
Full textA quality survey was performed on the position accuracy of two GNSS-methods (single station-RTK and network-RTK) for height determination, and a one-way analysis of variance (ANOVA) was used for statistical investigation of differences in the spread of height deviations. The GNSS-methods were applied on a reference point, which was determined prior with leveling, and measured with 20 minutes observation time and 30 minutes time separation, resulting in 5 series containing 400 observations each from respective method. The ANOVA test was performed by grouping the height deviations with respect to the measurement series, as well as the mean deviations with respect to the methods. Height determination with the ERTK method showed a total positional uncertainty of 22 mm (13-28 mm between the series) and a measurement uncertainty of 32 mm (2σ). Results obtained with NRTK showed a total positional uncertainty of 14 mm (9-14 between the series) and a total measurement uncertainty of 24 mm (2σ). The statistical tests showed that the differences between the measurement series for individual methods were significant (p = 0,000) but that the mean deviations between the methods were not (p = 0,115). NRTK obtained a lower positional uncertainty than ERTK measurements in this study, and the ANOVA test showed that there was no significant difference in the distribution of the mean deviations between the measurement methods. This study is important with regard to quality evaluation of different GNSS-methods and can be used as a basis for deciding on the applied measurement method.
Coufalová, Martina. "Hasičská zbrojnice." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-226409.
Full textMelle, Christophe, David Chaimbault, Fabien Peleau, and Alain Karas. "A Tri-Band L, S, C Prime Focus Feed: Concept, Design and Performance." International Foundation for Telemetering, 2013. http://hdl.handle.net/10150/579680.
Full textThe flight test mission services need higher data rates due to increased system complexity and the need for more accurate, higher rate, and better data acquisition. The existing L or S band frequency spectrum allocation was a limiting factor to meet this increased data rate requirement. The World Radio-communication Conference (WRC 2007) attributed new additional frequency spectrum allocations in the C band for Aeronautical Mobile Telemetry (AMT). The international flight test community has taken this opportunity to immediately take advantage of the new C-band range 5091-5250MHz. This paper presents the multi-band feed product designed by the RF & Antenna Laboratory of ZODIAC DATA SYSTEMS company. This feed is foreseen to be used in prime focus configuration on any diameter parabola dish providing telemetry and tracking channels in three L, S, and C bands. Here, are described the concept and the technology achieved taking into consideration the performance and industrial constraints. Moreover, this contribution focuses on the electromagnetic simulations of radiating elements, the feed network and RF system integration. This paper is structured as follows: firstly, the objectives and the motivation for developing a prime focus feed which works in L, S, C bands are presented. In particular, the market constraints and approach to find the best solution satisfying the feed RF requirements, and mechanical constraints, such as weight, size and cost, are discussed. The second section describes the 5 step development cycle: principle and technology, design of the telemetry channels and tracking function, cohabitation of the different radiating elements, and problems of the channels isolations. The third section discusses the performance achieved using electromagnetic simulations. The fourth section talks about the integration of RF system feed. The paper concludes by discussing future work using the same concept that is applied to other telecommunication or telemetry frequency bands.
Sit, Stefany. "New methods in geophysics and science education to analyze slow fault slip and promote active e-learning." Miami University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=miami1375708329.
Full textLindfeldt, Olov. "Railway operation analysis : Evaluation of quality, infrastructure and timetable on single and double-track lines with analytical models and simulation." Doctoral thesis, KTH, Trafik och Logistik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-12727.
Full textQC20100622
Framtida infrastruktur och kvalitet i tågföring
Raif, Lukáš. "Studie rekonstrukce železniční stanice Prostějov hl.n." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2014. http://www.nusl.cz/ntk/nusl-226633.
Full textKřemen, Tomáš. "Rekonstrukce železniční stanice Milevsko." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2015. http://www.nusl.cz/ntk/nusl-227594.
Full textYang, Jin. "Modeling of HVDC IGBT in Pspice : Serving an ultimate goal for converter station EMC studies." Thesis, KTH, Elektroteknisk teori och konstruktion, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-176859.
Full textEn IGBT-/diodmodell med mer exakta egenskaper an en enkel switch kravs foratt hantera EMC-problem fran omvandlarventilen. Syftet med denna magisteruppsatsar att utveckla en IGBT- och diodmodell for att uppna bade noggrantovergaende beteende och snabb simuleringstid under enkelpulsomkopplingstestkretsfor 4,5 kV och 2,0 kA-StakPak IGBT-modulen. En grindenhetsom liknar ABB-grindenheten implementeras for att fa god overensstammelsemellan simulering och matning. For demonstration och veriering, tillampasIGBT-/diodmodellen i en forenklad armsimulering av en fullskalig ABB Generation4 HVDC-VSC-omvandlarstation och med kapacitet for en halvcell bestaendeav 8 seriekopplade IGBT och deras anti-parallellkopplade dioder. Resultatenfran armsimuleringen analyseras vidare for EMC-studier av omvandlarstationen.Konvergensfragan ar det viktigaste problemet i hela processen for modellimplementeringoch -tillampning. For att garantera konvergensen i simulering ignorerasvissa egenskaper sasom svansspanningen vid slutet av avstangning. Mentotalt sett, valideras och antas modellen framgangsrikt.
Škarvada, Pavel. "Stanice technické kontroly." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-225798.
Full textDispan, Jérôme. "Biodégradabilité de la matière organique dans le continuum aquatique réseau d'assainissement - station d'épuration - milieu naturel récepteur." Phd thesis, Marne-la-vallée, ENPC, 2003. https://pastel.archives-ouvertes.fr/pastel-00000954.
Full textCaturla, Jean-Pascal. "AIRBUS Generic Flight Test Installation." International Foundation for Telemetering, 2011. http://hdl.handle.net/10150/595663.
Full textThis paper describes new concepts of test mean and processes to perform flight test for all Airbus aircraft family. The FTI (Flight Test Installation) designed for A320, A340, A380 and A350 programs include acquisition system, recorder, data processing, visualisation, Flight Test Engineer Station and optional functionalities (video acquisition, DGPS, telemetry ...) In the past, these test means were specific for each test aircraft. Due to the large number of Aircraft development in parallel Airbus has designed and standardized new tests means for development and production aircraft. The first goal is to generate significant benefits regarding time and costs savings by simplifying installation and reusing all the test installations components. This paper shows the opportunities and challenges of these new concepts.
DS̓ilva, Anthony. "Comparison of single-station and multiple station methods for site response estimation." 1996. http://catalog.hathitrust.org/api/volumes/oclc/36366577.html.
Full textTypescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 61-65).
Chen, I.-Chun, and 陳依君. "Stochastic Production Flow Control: Single Station Case." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/74001691873456645447.
Full text國立臺灣大學
電機工程學研究所
88
Production flow control has significant impacts on the delivery performance such as output volume, cycle time and on time delivery. A modern factory is often operated under distributed control architecture. Output delivery specifications for a factory can be translated into performance requirements of individual production entities such as machine groups within the factory. When shop floor performance requirements are closely mapped to delivery specifications, individual controller may then operate locally to meet their local performance requirements while effectively achieving the overall delivery specifications. This thesis focuses on two control operations to meet the local performance requirements of individual machine group: monitoring and machine allocation. First, we adopt statistical process control (SPC) based schemes as the monitoring mechanism for production flow to assess if the progress of production is normal or abnormal with respect to achieving performance requirements. To investigate whether SPC concepts can be applied to production flow control (PFC), we study the simplest but representative M/M/1 queueing system and investigate the detection of the shift in mean arrival and service rate by monitoring the sequence of transformed conditioned cycle times (TCCTs). Monitoring statistics, TCCTs, are derived according to the following innovative ideas. The cycle time changes among individual jobs are independent because of the Markovian property of M/M/1 queue. We therefore monitor the conditioned cycle time (CCT) of each job given the cycle time of its proceeding job. Although the CCTs of individual jobs are independent, they do not have either identical or normal distribution. A transformation is taken to transform CCTs into transformed CCTs (TCCTs) which are of independent and identically normal distributions. Two SPC-based control schemes, Shewhart and EWMA, are applied to monitoring such statistics for shift detection. Performance evaluation by simulation demonstrates that the rate shifts in a M/M/1 system are hardly detected by the Shewhart control scheme. Although they can be detected by EWMA control scheme under a good choice of parameters, the detection by the scheme is not fast enough when applied to a high-variety and low-volume manufacturing system. The effect of applying SPC-based schemes to PFC is therefore skeptical. We then study machine capacity allocation of a single machine system for meeting the local performance requirements. In the system, the machine is failure-prone and service rate adjustable. A service rate policy is proposed and analyzed, where different service rates imply the different machine capacity allocated to job processing. The policy assigns a slower service rate to the machine when the number of jobs waiting in the queue is no more than k and a faster mean rate otherwise. The relationship between performance metrics such as system size and the queue length and the control parameter are derived. And we also contribute to the derivation of inter-departure time distribution. As a result of the analysis, we derive the statistics of local performance requirements, including mean, variance, and squared coefficient of variation (SCV). The aspect of variability, i.e. second order statistics, as well as mean value is taken into consideration. Numerical experimentation shows that the service rate control policy has good effects of control in both mean and variance of queue length and system size. However, the variance of the inter-departure time is insensitive to service rate control policy. From these analysis and derivations, we not only understand the properties of the service rate control policy but also learn how to apply it to achieve the local performance requirements.
吳奇哲. "Composite Sector Beam Single-Conductor Leaky-Wave Antenna for Base-Station Application." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/83453606391070353371.
Full text國立交通大學
電信工程研究所
100
In this thesis, a single-conductor leaky-wave antenna(SCLWA) is proposed. By using spectral domain approach(SDA) analysis, we obtain the propagation constant of this antenna. We find that the phase constant β of this antenna is close to the wave number in the air k0. By the leakage angle equation of leaky-wave antenna, we find that this antenna radiate toward end-fire direction. We use this SCLWA to be the unit element and design sector beam antenna arrays which radiate toward end-fire direction. We also propose a sector antenna array beam composite method. Using this method, we easily estimate the radiation patterns of sector antenna array. By changing the radius and spacing angle and the length of antenna, we obtain the desire half power beamwidth(HPBW) radiation pattern and reduce the ripple effect. Then we design two sets of single-conductor leaky-wave sector antenna arrays, which have five-,and six-elements, respectively. Beamwidth are 70° and 90° respond to the above antenna arrays. Then we place four identical sector antenna array toward different direction. After adding an RF single pole four throw (SP4T) switch fabrication, the HPBW of the switchable sector antenna arrays are 280° and 360°. Because of the limitation of fabrication technology, the second set of sector antenna array is not achieved. The simulation and measurement result will be presented.
Gao, Jia-cian, and 高嘉謙. "Single-station Ground Motion Prediction Equation and Site-specific Seismic Hazard Analysis." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/63784306955669397359.
Full text國立中央大學
應用地質研究所
103
Due to frequent earthquakes in Taiwan, Probabilistic seismic hazard analysis (PSHA) is a common approach to evaluate potential earthquake motions at sites of critical facilities such a nuclear power plant and dams. It includes the estimation of the earthquake magnitude and distance of source, and earthquake intensity at a site. Ground motion prediction equation (GMPE) reflects the fact that the amplitude of the ground-motion increases with earthquake magnitude and decreases with propagation distance. Modern GMPEs are based on datasets of ground-motion parameters recorded at multiple stations and different earthquakes in various source regions. It causes excessive variability and leads to increase seismic hazard estimates. In the present study, only strong-motion data record at a site is selected to establish a GMPE. We processed strong-motion data from TSMIP in Taiwan which used these data to establish GMPEs. A total of 30602 records are selected and are used to accomplish the regression analysis of a regional GMPE in the first step. Then, 9 stations are selected to complele a single-station GMPE, respectively. The results reveal that the sigma of the regional GMPE is 0.626 in ln unit and the sigma of single-station GMPE is ranging 0.416 to 0.567. The single-station sigma is about 9% to 33% reduction from the regional one. When PSHA is performed by adopting the single-station sigma, the hazard is 11% to 48% smaller then that regional sigma is used. If source zones are further involved in GMPEs, the sigma of single-station GMPEs can reduced 16% to 36% relative to regional GMPE's. It is expected to further reduce the result of seismic hazard analysis.
Yeh, Ting-Yu, and 葉庭瑜. "Single-Station Ground-Motion Prediction Equation for North Eastern Taiwan Subduction Zone Earthquakes." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/96609222482088130696.
Full text國立中央大學
應用地質研究所
104
The sigma (standard deviation) of ground-motion prediction equation (GMPE) has great impact on probabilistic seismic hazard analysis (PSHA). Therefore, how to properly evaluate the sigma has been a crucial issue currently. There are abundant earthquake data in Taiwan, and it is one of the most earthquake-related research suitable sites. In this study, we update the ground-motion relationship for north eastern Taiwan subduction zone earthquakes by establishing new sets of interface and intraslab earthquakes GMPE. Moreover, single-station GMPEs are done for the purpose of reduction of the sigma due to elimination of the variability from site effect. In this study, ground-motion data of subduction zone for both interface and intraslab earthquakes are obtained from the Taiwan Strong-Motion Instrumentation Program (TSMIP). A total of 175 earthquakes and 14,660 records with moment magnitude greater than 4.0 are selected to establish PGA attenuation relationship. We chose the general usage of the functional forms by reviewing of previous studies. Each candidate term in the form was tested with Taiwan data set. The final form is generally similar to the form proposed by Lin and Lee (2008), besides a quadratic magnitude term, a VS30 term and a focal mechanism term were added. The coefficients of the equation are determined through non-linear regression analysis using maximum likelihood method (MLE) and mixed-effects model. Generally speaking, ground-motion from subduction zone earthquakes decay slower and may spread longer distances. The results show that intraslab earthquakes generally predict higher PGA than that of interface earthquakes. Both regional GMPE and 44 single-station GMPEs are done in this study. Comparing the sigma of regional GMPE and single-station GMPEs, the total sigmas of single-station GMPE are smaller than the regional sigma with a reduction rate from 1.5% to 37.0%, averaging 21.7%. In a comparison of the reduction rate between different regions, the evaluated from stations in Hualien have highest reduction rate, whereas that evaluated from stations in Ilan are the lowest. Such a difference might be due to different source and path effects.
KU, TSUNG-CHIEH, and 顧宗杰. "Queueing Model Analysis on a Single-Station Production SystemProducing Standard and Custom Products." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/39028756718457921600.
Full text中原大學
工業工程研究所
96
Due to the intense competition in the global market, if manufacturing system has great ability to produce efficiently and economically, it can provide services to the customers with shorter response time, and the products will have higher competitiveness in the global market. Therefore the appropriate management decisions for production are getting more and more important. In our study, we consider an single-station production system without the reservation mechanism that produces standard products for ordinary demands and custom products for specific demands. Custom products are made by alternating the existing standard ones from inventory with additional works and base-stock control policy is applied to control the production of the standard product. In this system, the production of the custom products for specific demands has higher priority than the production of the standard product. The fill rate of the ordinary demand and the on-time-delivery-rate of the specific demand are considered as the measures of the qualities of service. By assuming an Markovian system, qualities of service under base-stock policy are derived; furthermore, the optimal base-stock level can be obtained numerically under the requirements on the qualities of services.
Wang, Shao-Chung, and 王紹中. "Positioning the Location of a Single Base Station Using Angle of Arrival and Signal Strength." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/88976686535305088852.
Full textKuo, Ming-Yi, and 郭明儀. "profit analysis of the M/Ek/1 machine repair problem with a single non-reliable service station." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/38414021880323024554.
Full text國立中興大學
應用數學研究所
83
This thesis studies the profit analysis of the M/Ek/1 machine with a single non-reliable service station, in which the failuree negative exponential distribution, the service times the Erlangtion. The breakdown times of the service station are assumed to havetribution, and the repair times of the service station follow the Erlangtion. We develop the steady-state characteristics of the system such asmber of failed machines, the expected number of operating machines, theility, and the operative utilization in the system. A profit model istain the optimal number of operating machines N, say , in order total expected profit per machine per unit time.
Hong, Yunho. "Optimal control problems on stratified domains application to single-station multiclass queueing systems with finite buffers and overflow costs /." 2007. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-2165/index.html.
Full textWang, Chien, and 王健. "A Study of Ionosphere Single-Layer Model Appropriate Height by Using Continuously Operating Reference Station (CORS)-A Case Study of Taichung City." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/67889632026015073311.
Full text國立中興大學
土木工程學系所
105
Currently, ionospheric delays are the major cause of GPS positioning errors. To solve these errors, dual-frequency measurements may be used. However, dual-frequency instruments are expensive to fabricate. By contrast, a single-frequency receiver combined with an appropriate ionospheric model may achieve the same result; a suitable model can elevate positioning accuracy while lowering overall costs and the amount of materials required. Electron density inside the ionosphere changes over time and varies between different regions, altitudes, and solar power levels. In this study, observation data obtained using GPS at a continuously operating reference station in Taichung were used to build regional ionospheric models. In addition, a single-layer model was utilized to test the hypothetical thin spherical shell heights at different time periods to assess the ionospheric delay errors created and the effects of these errors on positioning accuracy. The objectives were to identify the optimal thin spherical shell height for each time period and to inform GPS single-frequency receiver users regarding what parameters to choose when engaging in ionosphere revisions, effectively enhancing positioning accuracy. First part of the study, three thin spherical shell heights (350, 400, and 450 km) were selected to construct the regional ionospheric models, which were subsequently compared with the IGS global ionospheric model. The experiment results showed that the regional ionospheric models fabricated using the three thin spherical shell heights displayed trends similar to those of the IGS global ionospheric model. Accordingly, this study hypothesized that an increase of thin spherical shell height by 50 km in the thin ionospheric model increases electron content by an average of approximately 3.2 TECU. Second part of the study, A single-frequency, single-point positioning test was performed for 16 time periods, use of regional ionospheric model with a thin spherical shell height of 400 km yielded the greatest positioning accuracy improvement, and that such an improvement was approximately 30% superior to that generated by the IGS global ionospheric model. Finally hypothesized that an increase of spherical shell height by 10 km to single-point positioning test the experiment results showed that the regional ionospheric models appropriate height of Taichung City was 390~420km.
(12547160), Jennifer Kay Hafner. "Earthquake backazimuth determination using a single three-component digital seismograph." Thesis, 1997. https://figshare.com/articles/thesis/Earthquake_backazimuth_determination_using_a_single_three-component_digital_seismograph/19769053.
Full textEarthquake backazimuth estimation using a single three -component digital seismograph has been investigated. A three-dimensional principal components method formed the basic computational technique. Other details of the backazimuth estimation procedure were varied to determine the optimum approach. The data set comprised aftershocks of the 1988 Tennant Creek earthquakes, recorded on a number of stations in, or close to, the source zone. Epicentral distances (3.5 to 25 km) were unusually small compared to the data sets of others who have used similar techniques.
Complex geology challenged the accuracy of results. The most likely causes of error were believed to be the interruption of source -receiver wave travel paths by fault planes, and complex site geology. This included outcrops of highly deformed rocks, and proximity to a large intrusive body of anomalous character. Errors of 180° were common, possibly due to the low velocity surface layers.
Single station estimates were compared to reference backazimuths from network locations, determined by "EQLOCL" (SRC, RMIT), a program based on the least -squares travel -time approach. Approximately 75% of backazimuth discrepancies, projected into the range -90 to +90°, were less than or equal to 20°. This outcome indicates that the investigated technique can be successfully used to estimate earthquake backazimuth in at least some complex geologic receiver settings, and at short epicentral distances.