Dissertations / Theses on the topic 'Open Hol'

碩士
世新大學
資訊管理學研究所(含碩專班)
99
In recent years VANET (Vehicular Ad Hoc Networks) has developed significantly. VANET uses the wireless technology to combine the On Board Unit (OBU) and Road Side Unit (RSU) to create a new type of network system. The main purpose of this system is to receive and send relevant information. This system can improve traffic efficiency, safety and comfort. Drivers can receive traffic information via internet. VANET has fast mobile speed and small range of network coverage. Users are often fail inauthentication because of they are out of network coverage. In this thesis is based upon Open ID and focus on user experience as the first priority. It will provide fast verification service, reduce complex verification processes and use Diffie-Hellman double verification system will be implemented to the VANET system. The research will be discussed in two phases; first phase is Open ID verification before the trip. Second phase is on road validation phase. Before the trip, vehicles will verify with Certificate Authority (CA) to join as an Open ID member. User can login by CA. In this thesis we will focus on Open ID authentication and the communications between two vehicles. Before the trip, CA will be in charge of negotiating secret parameters between the communicating vehicles, then of the secret values will be embedded in the Open ID. When a trip begins, vehicles will directly use Open ID to verify credentials between both sides. The Open ID will be updated its certificate and be verified the time stamp. The old credentials will be abolished. In this thesis we can achieve a fast and secure authentication between two vehicles.

碩士
國立臺灣科技大學
材料科學與工程系
104
The tensile and bearing strength of notched composites is an important factor for composite structural design. However, no literature is available on the notch sensitivity and pin loaded effects of self-reinforced polymer composites. In this study, self-reinforced recycled poly (ethylene terephthalate) (srrPET) composites were produced by film stacking from fabrics composed of double covered uncommingled yarns (DCUYs). Composites specimens were subjected to uniaxial tensile, flexural and Izod impact tests and the related results compared with earlier ones achieved on srPET composites reinforced with non-recycled technical PET fibers. Further on, the effects of open circular holes on the tensile strength of srrPETs with various width-to-hole diameter (W/D) ratios of the specimens, the effects of pin-loaded tensile behavior of srrPET composites with various W/D ratios and edge distance-to-hole diameter (E/D) ratios of the specimens, the endurance limit of tension–tension fatigue of pin loaded composites and damage development in srrPETs assessed by located acoustic emission were studied. Damage development in srrPET composites indicates that srrPET composites have higher resistance of the composite to crack propagation. These results proved that srrPET composites is tough, ductile notch-insensitive materials and have superior load carrying capability. The experimental results indicate that the bilinear (yielding followed by post-yield hardening) stress-strain curves were recorded in the open hole tensile (OHT) measurements. The srrPET composites had extremely high yield strength retention (up to 142%) and high breaking strength retention (up to 81%) due to the superior ductile nature of the srrPET composites, which induces plastic yielding near the hole thereby reducing the stress concentration effect. The superior load carrying capability is found in srrPET composites and highly dependent on the W/D ratios. The bearing failure mode occurs in W/D>4, the composites has high yield bearing strength (99.4 MPa) and extremely high ultimate bearing strength (199.3 MPa) due to strong interfacial bonding between the fiber and matrix contributes higher bearing strength. The strong interfacial bonding in srrPET composites has higher fatigue cycles and shows good endurance ability.

碩士
國立臺北科技大學
車輛工程系所
95
Recently, audio performance becomes an important issue of the 3C products such as mobile phone and notebook. Micro-speakers are widely used in these products. The audio performance depends on the enclosure and open holes design. The aim of this research is to study the effect of the enclosure (front and rear) and also the size and pattern of open holes. Experiments are measured with the CLIO audio test system in a semi-anechoic room. The front-rear enclosure and open hole can be modeled as electric components in an analogous circuit of the EMA (Electro-Mechano-Acoustical) system. It can effectively simulate the audio performance in the product design stage.

The central thesis of this study is that Newbigin‟s thought and writing can contribute to understanding the church as an integral part of Indian society, in terms of both her identity and role. Newbigin‟s writing, subsequent to his return to the West after more than three decades in India, often sought to address what he saw as the Western church‟s loss of confidence in its role and position in a post-enlightenment, post-Christendom society. This study tries to work with this material, as well as what was written during his time in India. The second chapter and the third chapter give consideration to the two central elements in Newbigin‟s understanding of the church‟s mission and identity: the eschatological renewal of the whole earth that will occur at the return of Christ and the connection of this end to Christ‟s death on the cross. As the third chapter will consider, while he locates the focus of the church‟s mission in relation to the end, the death of Christ indicates the way in which this mission will be carried out. The remainder of the third chapter will consider the implication of this for the church‟s mission in relation to the presence of poverty and marginalisation in Indian society and its movement towards a consumer economy. The fourth chapter will consider the place of the church in relation to India‟s long and rich culture, suggesting ways in which the church is to become an incultured community. The fifth chapter will address the issue of the relationship of the church to the followers of other faiths. Through interaction with some Indian theologians it will be shown how Newbigin gave attention to the church as both open to the movement of the Spirit beyond the boundaries of the church, while also emphasizing the church as central to our knowing Christ. The sixth chapter will draw out the ways in which Newbigin was consciously engaging with the post colonial context of the church, particularly in his interpretation of the relationship between the Spirit and the church.
Christian Spirituality, Church History & Missiology
D. Th. (Missiology)

Conventionally the size of the back clearance played a great importance on reducing the axial clearance by utilizing the concept that the decreased axial clearance results in lower axial force acting on the impeller. However, from the previous works on the effect of the back clearance on the hydrodynamic forces upon the semi-open impeller showed the opposite trend: increasing the back clearance results in the reduced axial loading. In this work, the CFD simulation of an entire pump and detailed analysis on the back clearance flow are performed. By utilizing the commercially available software, meshing and CFD simulations are performed. LDA data, unsteady pressure data, and pressure distributions on the housing are used to validate the CFD model. The flow field prediction of the back clearance flow is then compared with other researcher’s works of the gap flow analysis between the rotating and stationary disks. The flow field inside the impeller passage, which is very sensitive to the back clearance size, is also studied. The empirical equation for the leakage loss through the balance holes is produced using the CFD predictions.

Fiber-reinforced composite (FRC) materials are ideal for the aerospace and automotive industries which require high-strength structures with exceptional specific properties. The unfortunate reality is composite materials are susceptible to complex failure modes and difficult-to-predict damage growth as a result of their heterogeneity and anisotropy. Thus, robust structural health monitoring (SHM) for in-operation tracking of damage formation and accumulation is important for these materials. Self-sensing materials are a strong candidate to replace traditional composite SHM because they do not suffer from the disadvantages of point-based sensing. The piezoresistive effect in nanofiller-modified materials is a common approach to material self-sensing. Research to date in piezoresistivity has predominantly focused on the direct current (DC) response of such materials. This is an important limitation because alternating current (AC) has important advantages – it inherently possesses more information (AC data can relate both impedance magnitude and phase to damage), AC effects can be leveraged for improved damage sensitivity, and AC interrogation can reduce power requirements. Therefore, to develop knowledge that will facilitate the transition to AC, this work explores the effect of high-cycle
fatigue loading on the AC response of carbon nanofiber (CNF)-modified glass fiber/epoxy laminates. In this study, impedance magnitude and phase angle are measured along the length and through the thickness of composite specimens with an open-hole stress concentration
subjected to tension fatigue-loading up to 10 MHz. The collected impedance data is fit to an equivalent circuit model as a function of cycle. These results show that high-cycle fatigue loading does indeed have an appreciable effect on the equivalent circuit behavior of the material. However, clear and definitive trends were not observed thereby suggesting that further research is needed into the basic mechanisms of AC transport in nanocomposites if frequency-dependent transport is to be used to track fatigue loading.

碩士
國立臺灣海洋大學
河海工程學系
106
In this paper, the wave elevation transformation of the outer cylinder and the horizontal force change of the inner cylinder are discussed when the regular waves pass through the concentric cylinder of the outer water transmission, In addition to the hydraulic model experiment, the comparison is also carried out through numerical simulation of the force change of a single impervious cylinder.In the hydraulic model experiment, different conditions of outer cylinder are used to discuss the horizontal force change of the inner cylinder under different conditions. There are two kinds of outer diameter of outer cylinder and three kinds of porosity. The results of this study show that the horizontal force change of the inner cylinder decreases with the decreases of porosity, but not much. In addition, when the porosity is 40% and kr=0.41, the force on inner cylinder is larger than the monopile impermeable cylinder..The wave elevation transformation trend of the outer cylinder is approximately the same, and it is not changed by the change of the outer diameter and porosity, and the wave elevation transformation ratio is gradually stable with the increase of the period.

The purpose of this report is to explore the ways in which Asian American men participate in hip hop culture, and what this participation says about their politics and representation in United States media and popular culture. This is done through an analysis of Freestyle Friday All Star, MC Jin, a Chinese American emcee from Queens, New York, as well as DJ Soko, a Korean American DJ from Detroit, Michigan. I argue that their participation is a desire for political power and creative visibility rendered on their own terms.
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Personality, or behavioural differences among individuals, which are stable both in time and across contexts, is a highly popular topic. Currently there has been an increase of interest in the relationship between personality and repeatability, which is a methodical approach developed to measure the stability of interindividual differences in time. The aim of this thesis is to evaluate the personality of rats according to behavioural patterns exhibited under widely used testing procedures in new environment (open field test, hole board test) and to compare, how behavioural traits in these tests mutually correlate and change over time. Each test trial was repeated eight times with different intervals (24 hours, 6 days, 4 weeks). The results suggest that most of the recorded behavioural variability can be explained with three principal axes. The first one is associated with loco-exploratory activity of the subject. The elements of behaviour associated with this axis are the most repeatable. The second axis is mostly associated with time the animal spent in the central part of the arena and the third axis represents the interest in holes in hole board test. These two axes are less repeatable. A significant effect of the identity of the animal was found in all behavioural traits, associated with these...

The effect of the distance between impact point and hole position and the angle of the hole with the vertical axis was studied. In order to understand this effect, flexural tests were also performed to evaluate the bending strength of CFRP. In terms of distance of the hole, a maximum reduction of 29.7% on the bending load for a distance of 0 mm was found. This reduction was 22.3% on the impact load. In terms of angle of the hole, a maximum load reduction of 15.6% on the bending strength was found and for the impact load this value was found to be 7% for 20º. The fatigue resistance was also studied. An average reduction of 68.5% on the fatigue resistance of GFRP was obtained for an impact energy of 12 J, in the presence of a hole.
O efeito da distância entre o ponto de impacto e posição de um furo e o ângulo do mesmo com o eixo vertical foi estudado. Para avaliar este efeito, foram também realizados ensaios de flexão. Em termos de distância do furo, uma redução máxima da resistência à flexão de 29,7% foi verificada para uma distância do furo de 0 mm. Esta redução foi de 22,3% no carregamento de impacto. Em termos de ângulo do furo, a redução máxima do carregamento foi de 15,6% para a flexão e em relação ao impacto este valor foi de 7%, para um ângulo de 20º. A resistência à fadiga foi também estudada. Foi verificada uma redução média de 68,5% na resistência à fadiga em compósitos de fibra de vidro para uma energia de impacto de 12 J, na presença de um furo.

Abstract in English, Sesotho and Zulu
The occurrence of Open Distance and e-Learning revolutionized Higher Education Institutions for students to access instruction at anytime and anywhere. Students benefitted instruction of anytime and anywhere in one of the Technology Education courses in ODeL from the e-tutors. As a result of the support from the e-tutors, the curriculum was designed to place a strong emphasis on the design process as the core around which the teaching of the curriculum should revolve. However, it is still not clear how effective is the content knowledge which relates to the design process from the e-tutors. In acknowledgment from such a gap, this study aimed to determine the relationship between the e-tutors’ technological, pedagogical, content knowledge of teaching design process within Technology Education specialization. In order to achieve this purpose, two theories, namely Transactional distance and Connectivism were coined together with the Technological Pedagogical Content Knowledge (TPACK) framework to underpin the study. The philosophical worldview is pragmatism having employed mixed method. Participants in this study were 145 students who registered a year programme for two modules in the Bachelor of Education (B.Ed.) programme at a Higher Education institution were surveyed to collect the quantitative data. Data from the face-to-face semi-structured interviews were collected with five e-tutors from the research sites. Online observations data were collected from the e-tutor sites of the institution’s learning management system (LMS). The results suggest that e tutors still lack the technology knowledge in order to deliver the content aimed for the design process in an ODeL environment. Also, it was evidenced that the e-tutors have not acquired pedagogical strategies for driving the pedagogy for the design process in an ideal context of ODeL. It should also be borne in mind that findings for the content knowledge indicated that the e-tutors still lack the knowledge for exploiting content knowledge of the design process to suit an ODeL environment. These findings highlight a need for technology to support e tutors’ pedagogical strategies towards a meaningful understanding of the design process and its implications across ODeL contexts.
Ketsahalo ea Open Distance le e-Learning e ntlafalitse litsi tsa thuto e phahameng bakeng sa baithuti ho fihlella taeo nako efe kapa efe le kae kapa kae. Baithuti ba ile ba rua molemo taelong ea nako efe kapa efe le kae kapa kae ho e 'ngoe ea lithuto tsa Technology Technology ho ODeL ho tsoa ho li-tutors. Ka lebaka la ts'ehetso e tsoang ho li-tutors, kharikhulamo e ne e etselitsoe ho hatisa ka matla ts'ebetso ea moralo e le khubu eo thuto ea kharikhulamo e lokelang ho potoloha ho eona. Leha ho le joalo, ha ho sa hlaka hore na tsebo ea litaba e sebetsa hantle hakae e amanang le tšebetso ea moralo ho tsoa ho li-tutors. Ho ananela lekhalo le joalo, phuputso ena e ne e ikemiselitse ho tseba kamano lipakeng tsa theknoloji ea "e-tutors", thuto ea thuto, tsebo ea litaba ea ts'ebetso ea moralo oa ho ruta ka har'a tsebo ea thuto ea Technology. Bakeng sa ho fihlela sepheo sena, ho ile ha qaptjoa likhopolo tse peli, e leng Transactional distance le Connectivism hammoho le sebopeho sa Technological Pedagogical Content Knowledge (TPACK) ho tšehetsa thuto. Pono ea lefatše ea filosofi ke pragmatism e sebelisang mokhoa o tsoakaneng. Barupeluoa thutong ena e ne e le baithuti ba 145 ba ngolisitseng lenaneo la selemo bakeng sa li-module tse peli lenaneong la Bachelor of Education (B.Ed.) setsing sa Thuto e Phahameng ba ile ba hlahlojoa ho bokella lintlha tse ngata. Lintlha tse tsoang lipuisanong tsa sebopeho sa sefahleho li ile tsa bokelloa le barupeli ba bahlano ba tsoang libakeng tsa lipatlisiso. Lintlha tsa tlhaiso-leseling ka inthanete li ile tsa bokelloa ho tsoa litsing tsa e-tutor tsa sistimi ea taolo ea ho ithuta ea setheo (LMS). Liphetho li fana ka maikutlo a hore barupeli ba ntse ba haelloa ke tsebo ea mahlale a morao-rao molemong oa ho fana ka litaba tse reretsoeng ts'ebetso ea boqapi tikolohong ea ODeL. Hape, ho ile ha pakoa hore li-e-tutors ha li e-so fumane maano a thuto ea ho khanna lithuto tsa thuto bakeng sa moetso oa moralo ka mokhoa o loketseng oa ODeL. Hape ho lokela ho hopoloa hore liphuputso tsa tsebo ea litaba li bontšitse hore li-e-tutors li ntse li haelloa ke tsebo ea ho sebelisa tsebo ea litaba tsa moralo oa moralo ho latela tikoloho ea ODeL. Liphuputso tsena li totobatsa tlhoko ea mahlale a morao-rao ho ts'ehetsa maano a thuto a barupeli ho fihlela kutloisiso e hlakileng ea ts'ebetso ea moralo le litlamorao tsa ona maemong a ODeL.
Ukutholakala kwe-Open Distance ne-e-Learning kuguqula izikhungo zemfundo ephakeme zabafundi ukuthi bathole imfundo nganoma yisiphi isikhathi noma kuphi. Abafundi bahlomule ngokufundiswa nganoma isiphi isikhathi noma kuphi kwesinye sezifundo zeTechnology Education ku-ODeL kubafundisi be-e. Njengomphumela wokwesekwa okwenziwa abafundisi be-e-tutors, ikharikhulamu yakhelwe ukugcizelela kakhulu inqubo yokwakhiwa njengongqikimba okumele kufundiswe ngayo ikharikhulamu. Kodwa-ke, akukacaci ukuthi lusebenza kangakanani ulwazi lokuqukethwe oluphathelene nenqubo yokwakha evela kubafundisi be-e. Ngokwazisa ngaleligebe elinje, lolu cwaningo luhlose ukucacisa ubudlelwano phakathi kwezobuchwepheshe be-e-tutors, ubuchwepheshe bokufundisa, ulwazi lokuqukethwe lwenqubo yokwakhiwa kokufundisa ngaphakathi kobuchwepheshe be-Technology Education. Ukufeza le njongo, imibono emibili, okungukuthi iTransactional distance neConnectivism yahlanganiswa kanye nohlaka lweTechnological Pedagogical Content Knowledge (TPACK) ukusekela ucwaningo. Umbono wezwe wefilosofi yi-pragmatism esebenzisa indlela exubile. Ababambe iqhaza kulolu cwaningo bekungabafundi abayi-145 ababhalise uhlelo lonyaka lwamamojula amabili kuhlelo lweBachelor of Education (B.Ed.) esikhungweni seMfundo ePhakeme bahlolisiswa ukuqoqa imininingwane yobungako. Imininingwane evela ezingxoxweni ezihlelekile ezenziwe ubuso nobuso zaqoqwa nama-e-tutors amahlanu avela kumasayithi ocwaningo. Idatha yokubuka eku-inthanethi yaqoqwa kusuka kumasayithi e-e-tutor ohlelo lokuphatha lokufunda (LMS). Imiphumela iphakamisa ukuthi abafundisi be-e basenalo ulwazi lobuchwepheshe ukuze bakwazi ukuletha okuqukethwe okuhloselwe inqubo yokwakhiwa endaweni ye-ODeL. Futhi, kufakazelwe ukuthi abafundisi be-e abakawatholi amasu okufundisa okushayela inqubo yokuqamba ngendlela efanelekile ye-ODeL. Kumele futhi kukhunjulwe ukuthi okutholakele kolwazi lokuqukethwe kukhombisile ukuthi ama-e-tutors asenalo ulwazi lokusebenzisa ulwazi lokuqukethwe kwenqubo yokwakhiwa ukuze ivumelane nemvelo ye-ODeL. Lokhu okutholakele kugqamisa isidingo sobuchwepheshe ukuxhasa amasu e-tutors 'pedagogical maqondana nokuqonda okunenjongo kwenqubo yokwakhiwa nemithelela yayo kuzo zonke izingqikithi ze-ODeL.
Curriculum and Instructional Studies
Ph. D. (Science and Technology Education)