This study investigates the long-term and short-term dynamic relationships among the variables of stock returns and institutional investors' buy-sell difference in Taiwan's stock market for the sample periods from Jan., 2000 through May, 2009. Some econometrical methodologies are used in this study, such as unit test, vector autoregressive model, cointegration test, vector error correction model, impulse response function. The major empirical results are shown as follows: 1. Cointegration test For the sample periods, one long-term equilibrium relationship is found from the Johansen's cointegration test, significantly with 5% confidence level between stock year returns and the buy-sell difference for the foreign investment institutions, the domestic investment institutions, and the dealers. The long-term equilibrium relationship is Ry=1.65*QFII+4.28*FUND+35.22*DLR-1142.6. 2. VECM estimation (1)With the vector error correction model (VECM) being applied to the sample periods, the findings indicate that the changes of stock returns are not influenced among the short-term dynamic relationships by the changes of institutional investors' buy-sell difference, but only affected by one-period-lag of itself. (2) Among the short-term dynamic relationships, the changes of foreign investment institutions' buy-sell difference are affected by one-period-lag of institutional investors that positively affected by one-period-lag of the dealers, and inversely affected by one-period-lag of itself and one-period-lag of the domestic investment institutions. However, it is positively affected by one-period-lag of long-term equilibrium, which indicates foreign investment institutions follow positive feedback trading strategies. (3)The changes of the domestic investment institutions' buy-sell difference are only affected by one-period-lag of itself among the short-term dynamic relationships. (4)The changes of the dealers' buy-sell difference are positively affected among the short-term dynamic relationships by one-period-lag of the foreign investment institutions. As for the long-term relationships, it is affected by one-period-lag of long-term equilibrium, which also indicates the dealers follow positive feedback trading strategies. (5)The foreign investment institutions and the dealers have the mutual feedback relationship.

<p>In hands-free telephony and in teleconference systems, the main aim is to provide agood free voice quality when two or more people communicate from different places.The problem often arises during the conversation is the creation of acoustic echo. Thisproblem will cause the bad quality of voice signal and thus talkers could not hearclearly the content of the conversation, even thought lost the important information.This acoustic echo is actually the noise which is created by the reflection of soundwaves by the wall of the room and the other things exist in the room. The mainobjective for engineers is the cancellation of this acoustic echo and provides an echofree environment for speakers during conversation. For this purpose, scientists designdifferent adaptive filter algorithms. Our thesis is also to study and simulate theacoustics echo cancellation by using different adaptive algorithms.</p>

In recent years, bridge foundations have been in the spotlight throughout the nation. Bridges built over running water are susceptible to erosion or scour around their foundations. The reduction in load capacity to piers and abutments pose a safety risk to highway motorists. It has become necessary for engineers to examine and monitor these "scour critical" bridges. The difficulty arises with subsurface foundations of which very little is known about their construction. Hence, the methods applied to analyzing "Unknown Foundations" have become a necessary topic of research. This thesis explores a method to determine foundation lengths. Similar to Sonic Echo / Impulse Response, this procedure measures reflected shock waves sent through concrete pilings. The technique is non-destructive in nature and is performed near the surface of the foundation. The test is performed on the side of the exposed piling. Current methods are limited by the fact that the tops of most pilings are inaccessible due to pilecaps or beams. Often times, pilings are embedded in stiff soils, which have a dampening effect on the stress waves. This thesis employs a method of analysis that will overcome such limitations and provide engineers with another tool to determine subsurface foundation lengths.

Personnel who work on the flight deck of an aircraft carrier are exposed to extreme levels of jet engine noise often in excess of 140 decibels (dB). The current circumaural hearing protective devices (CAHPD) employed by flight deck crewmen are inadequate for the level of protection required for these extreme levels of noise. Fiber-reinforced thermoset polymer composite (FRPC) materials such as aramid fibers used in body armor, have high theoretical values of acoustic impedance due to a fundamentally high modulus of elasticity and may offer a superior level of hearing protection over original equipment (OE) thermoplastic CAHPDs. The objective of this project was to measure and evaluate the attenuation of CAHPD’s constructed from FRPC materials. FRPC CAHPD ear cups were paired with OE thermoplastic CAHPD ear cups of equal shape and thickness, and the protected and unprotected A-weighted sound pressure level (SPL) was measured in continuous and impulse noise environments >80 dBA using a JOLENE manikin. These data were evaluated for paired differences between the protected and unprotected mean SPL, and OE protected and FRPC protected mean SPL and indicates that OE thermoplastic CAHPDs provide greater sound attenuation of continuous noise >80 dBA and aramid FRPC CAHPDs provide greater sound attenuation of impulse noise >80 dBA.

This work is motivated by the Variable Specific Impulse Magnetoplasma Rocket (VASIMR) experiment. This device uses a helicon antenna to generate a plasma inside a dielectric tube, which is radially confined and directed towards the rocket nozzle by an axial magnetic field. An ion cyclotron heating antenna further heats the ions, and a magnetic nozzle accelerates the plasma along the confining magnetic field as it leaves the rocket, ultimately allowing it to detach from the magnetic field and produce thrust. The experimental research presented here provides insight into the physical mechanisms of power flow in a helicon system by providing an overall system power balance in the form of heat flux measurements, and exploring changes in the heat fluxes in different parts of the system in response to varying operational parameters. An infrared (IR) camera measures the total heat flux into the dielectric tube surface, and axially scanned bolometer and UV photodiode probes measure the radial power loss from particles and radiation. Results from IR camera measurements on three different helicon systems are presented: the VASIMR VX-50 experiment, the VASIMR VX-CR experiment, and the University of Texas at Austin (UT) helicon experiment. These results demonstrate the development of the IR camera diagnostic for use on helicon systems of varying scale and geometry, and show reasonable agreement as to the fraction of input power lost to the dielectric tube walls. On the UT experiment, the results presented account for essentially all of the input power, providing a full system power balance. The data from all three experiments indicate that radial transport of ions to the interior wall is the dominant mechanism of power loss, with UV radiation contributing a small percentage. Additional experiments on the UT helicon explore energy and particle transport to the wall due to capacitive coupling of ions near the antenna. These experiments show clear damage to the dielectric tube surface directly under the antenna, due to physical plasma etching of the surface by bombarding ions that are accelerated into the wall by local electric fields from the antenna. / text

Appar är idag en stor marknad eftersom de flesta äger en smartphone och därför är potentiella appkonsumenter. Trots att endast en tredjedel av alla svenskar betalar för mobilspel spenderas hundratals miljoner kronor på köp av appar varje år. Spel är den mest populära appkategorin i svenska App Store och Google Play vilket gör att utvecklare som inte skapar spel har svårt att synas. En etablerad modell i marknadsföringsområdet är köpprocessen, som beskriver hela processen genom ett köp från behovsupptäckande till utvärdering av inköpt produkt. Förståelse för vad som påverkar konsumenter i de olika stegen är viktig för att kunna utforma sin marknadsföring effektivt.Eftersom mobilspel ofta är gratis kan köpprocessen vid nedladdning av spelappar skilja sig från den traditionella, då exempelvis impulsköp kan uppstå i betydande omfattning. Då appmarknaden fortfarande är ung är forskningen inom den begränsad. Syftet med denna studie är att undersöka hur köpprocessen ser ut vid nedladdning av spelappar. För ökad förståelse studeras även områden som påverkar de olika faserna i köpprocessen.Då det inte finns tidigare forskning i det undersökta området genomfördes en kvalitativ studie för att kunna identifiera beteendemönster. Tolv personer i åldrarna 16-25 som spelar spel på smartphones deltog på semi-strukturerade intervjuer och berättade hur de går tillväga när de skall ladda ner ett nytt mobilspel. En litteraturstudie av områden relaterade till köpprocessen ligger till grund för utformningen av intervjuguiden.Resultaten visar att behov av att ladda ner ett nytt mobilspel uppstår genom tristess eller rekommendationer. Information om spelet hämtas från spelets butikssida, där bland annat bilder och videor är betydande. När man är intresserad av ett kostnadsfritt spel laddar man i regel ner utan att tänka på några konsekvenser eftersom man kan avinstallera spelet ifall man inte gillade det. Uppfattningen av utvecklaren påverkas inte beroende på om man är nöjd med det nedladdade spelet eller inte, då man sällan tittar på utvecklaren när man letar efter ett nytt spel. En positiv uppfattning om spelet kan leda till att man rekommenderar spelet till vänner. Är man missnöjd kan man avråda folk man känner, men man brukar inte tala illa om ett spel utan att ha blivit tillfrågad.Studien visar att köpprocessen för nedladdning av gratisspel har fyra steg istället för fem medan processen för betalspel är oförändrad. När det gäller gratisspel har jämförelsefasen tagits bort då det inte sker någon jämförelse innan nedladdning. Informationssökningsfasen har översatts till uppfattning då det är mer beskrivande av fasens innebörd. Faktorer som påverkar de olika stegen i köpprocessen så som attityd, minne och känsloläge sammanfattas i en tabell. / Apps are today a big market since most people own a smartphone and thus are potential app consumers. Even though just a third of all Swedes pay for mobile games, hundreds of millions Swedish Crowns are spent buying apps each year. Games is the most popular app category in the Swedish App Store and Google Play, causing developers who are not making games struggle to be seen. An established model in marketing is the buying decision process, describing the entire process from need identification to evaluation of bought product. The understanding of areas affecting the different stages is important in order to successfully design effective marketing strategies.Since mobile games tend to be free, the buying decision process while downloading gaming apps may differ from the traditional process, since e.g. impulse buying behavior may happen in greater extent. Because the app market is still young, the research is limited. The purpose of this study is to look into the structure of the buying decision process for downloading gaming apps. To extend the understandings, areas affecting the different stages of the buying decision process are examined.Because there is no prior research addressing the studied area, a qualitative approach was performed in order to identify behavior patterns. 12 persons in the ages of 16-25 who play games on their smartphones participated on semi structured interviews, explaining their process for downloading a new mobile game. A literature study of areas related to the buying decision process is the basis for the design of the interview guide.The results show that the need for a new mobile game arises in due to boredom or recommendations. Information about the game is collected from the game’s page at the app store, images and videos being of great importance. When interested in a free game one usually download without regards of any consequences, because you can easily uninstall the game if you did not like it. The opinion of the developer is not affected whether you like the game or not due to the fact one rarely observe the developer while searching for a new game. A positive judgment of the game may lead to the player recommending the game to friends. When dissatisfied one may advise against the game to people you know, but it is rare to speak ill of a game without being asked about it.The study shows that the buying decision process for downloading free mobile games consists of four stages instead of five, while the process for priced games remains the same. Regarding free games, the evaluation of alternatives is removed due to the process being nonexistent prior to a download. The information search stage is replaced with perception, since it better fits to describe the meaning of the stage. Areas affecting the different stages of the buying decision process such as attitude, memory and affect are summarized in a table. The study is in Swedish.

Juvenile delinquency is a widely known problem and some adolescents are constantly engaging in delinquency. The present study examined two types of broader risky personality factors, termed “Inflated Ego” and “Low Impulse Control”, and how the two factors were related to delinquency and antisocial behaviors for adolescent boys and girls. The data was drawn from a large community sample of youths in 8th and 9th grade. The results showed that for both boys and girls, the two factors were similarly related to an antisocial lifestyle and delinquency. However, a low impulse control was the critical risk factor for persistence in delinquency. In conclusion, there is not only one single personality factor behind adolescents’ delinquency, but low impulse control seems to be the most essential predictor. / Ungdomskriminalitet är ett utbrett problem och vissa ungdomar är konstant inblandade i kriminella aktiviteter. Denna studie undersökte två typer av bredare personlighetsfaktorer förknippade med risker, benämnda ”Uppblåst Ego” och ”Låg Impulskontroll”, samt hur dessa var relaterade till kriminalitet och antisociala beteenden för pojkar och flickor. De data som använts kommer från ett stort sampel av ungdomar i åttonde och nionde klass i Örebro. Resultaten visade att de två faktorerna var relaterade på liknande sätt för både pojkar och flickor till en antisocial livsstil och brottslighet. Dock visade sig låg impulskontroll vara den övervägande riskfaktorn för en fortsatt kriminell bana. Sammanfattningsvis finns det inte bara en enda förklarande personlighetsfaktor bakom ungdomars brottslighet.

Mémoire numérisé par la Division de la gestion de documents et des archives de l'Université de Montréal

Hintergrund: Systematische Darstellungen zur Diagnostik und Verhaltenstherapie von sexuellen Gewalttätern mit psychischen Störungen fehlen im deutschen Sprachraum fast völlig. In der vorliegenden Arbeit werden deshalb für diese kleine, aber besonders gefährliche Tätergruppe die auf der Basis des DSM IV hauptsächlich relevanten Diagnosen (Paraphilie und Störung der Impulskontrolle) und für diese Störungen geeignete Behandlungsmethoden vorgestellt. Methoden: Merkmale, die Paraphile und Impulskontrollgestörte im Hinblick auf Lerngeschichte, sexuelle Präferenz und tatauslösende Bedingungen differenzieren, werden dabei hervorgehoben. Weiterhin wird eine erste Validierungsstudie vorgestellt, in der untersucht wurde, inwieweit sich beide Störungsgruppen hinsichtlich Impulsivität, sozialer Angst, Konfliktvermeidung und dysfunktionaler Selbstaufmerksamkeit unterscheiden. Ergebnisse: Die Ergebnisse verdeutlichen, dass die vorgeschlagene Kategorisierung valide ist und dass sich Paraphile und Impulskontrollgestörte psychologisch bedeutsam voneinander differenzieren lassen. Schlussfolgerungen: Auf dieser Basis lassen sich Aussagen über störungsspezifisch relevante Behandlungselemente ableiten. Unterschiedliche Vorgehensweisen bei Paraphilen bzw. Impulskontrollgestörten werden für folgende Bereiche skizziert: Aufbau einer therapeutischen Beziehung, Änderung der sexuellen Präferenzen, Training sozialer Fertigkeiten und der Konfliktbewältigung, Modifikation dysfunktionaler Kognitionen und Rückfallprävention. / Background: Systematic work regarding the diagnostics and behavior therapy of violent sex offenders with mental disorders is mostly lacking in German publications. Therefore, this study presents the diagnoses which are mainly relevant for this small but particularly dangerous group of offenders on the basis of DSM IV (paraphilia and impulse control disorders) and describes specifically indicated interventions. Methods: Characteristic features are emphasized which differentiate paraphiliacs and offenders with an impulse control disorder with regard to learning history, sexual preferences, and the stimulus conditions which triggered the offense. Further, a validation study is presented which examined the differences between both disorders concerning impulsivity, social anxiety, avoidance of interpersonal conflicts, and dysfunctional self-consciousness. Results: Results showed that the proposed categorization is valid and that paraphiliacs and offenders with an impulse control disorder can be psychologically useful differentiated. Conclusions: In this framework, first conclusions can be drawn regarding the treatment elements which are considered to be relevant for disorder-specific therapy. Different procedures for the treatment of paraphiliacs and offenders with an impulse control disorder are described for the following areas: establishment of a therapeutic relationship, modification of sexual preferences, training of social and coping skills, conflict management, modification of cognitive distortions, and relapse prevention. / Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich.

Mitigation of the blast risk associated with terrorist attacks and accidental explosions threatening critical infrastructure has become a topic of great interest in the civil engineering community, both in Canada and abroad. One method of mitigating blast risk is to retrofit vulnerable structures to resist the impulsive effects of blast loading. A comprehensive re-search program has been undertaken to develop fibre reinforced polymer (FRP) retrofit methodologies for structural and non-structural elements, specifically reinforced concrete slabs and walls, subjected to blast loading. The results of this investigation are equally valid for flexure dominant reinforced concrete beams subject to blast effects. The objective of the research program was to generate a large volume of research data for the development of blast-resistant design guidelines for externally bonded FRP retrofit systems. A combined experimental and analytical investigation was performed to achieve the objectives of the program. The experimental program involved the construction and simulated blast testing of a total of thirteen reinforced concrete wall and slab specimens divided into five companion sets. These specimens were subjected to a total of sixty simulated explosions generated at the University of Ottawa Shock Tube Testing Facility. Companion sets were designed to study one- and two-way bending, as well as the performance of specimens with simply-supported and fully-fixed boundary conditions. The majority of the specimens were retrofitted with externally bonded carbon fibre reinforced polymer (CFRP) sheets to improve overall load-deformation characteristics. Specimens within each companion set were subjected to progressively increasing pressure-impulse combinations to study component behaviour from elastic response up to inelastic component failure. The blast performance of companion as-built and retrofitted specimens was quantified in terms of measured load-deformation characteristics, and observed member behaviour throughout all stages of response. The results show that externally bonded FRP retrofits are an effective retrofit technique to improve the blast resistance of reinforced concrete structures, provided that debonding of the composite from the concrete substrate is prevented. The test results also indicate that FRP retrofitted reinforced concrete structures may survive initial inbound displacements, only to failure by moment reversals during the negative displacement phase. The experimental test data was used to verify analytical techniques to model the behaviour of reinforced concrete walls and slabs subjected to blast loading. The force-deformation characteristics of one-way wall strips were established using inelastic sectional and member analyses. The force-deformation characteristics of two-way slab plates were established using commonly accepted design approximations. The response of all specimens was computed by explicit solution of the single degree of freedom dynamic equation of motion. An equivalent static force procedure was used to analyze the response of CFRP retrofitted specimens which remained elastic after testing. The predicted maximum displacements and time-to-maximum displacements were compared against experimental results. The analysis indicates that the modelling procedures accurately describe the response characteristics of both retrofitted and unretrofitted specimens observed during the experiment.