High stability multiplexed fibre interferometer and its application on absolute displacement measurement and on-line surface metrology

We propose a self-reference multiplexed fibre interferometer (MFI) by using a tunable laser and fibre Bragg grating (FBG). The optical measurement system multiplexes two Michelson fibre interferometers with shared optical path in the main part of optical system. One fibre optic interferometer is used as a reference interferometer to monitor and control the high accuracy of the measurement system under environmental perturbations. The other is used as a measurement interferometer to obtain information from the target. An active phase tracking homodyne (APTH) technique is applied for signal processing to achieve high resolution. MFI can be utilised for high precision absolute displacement measurement with different combination of wavelengths from the tuneable laser. By means of Wavelength-Division-Multiplexing (WDM) technique, MFI is also capable of realising on-line surface measurement, in which traditional stylus scanning is replaced by spatial light-wave scanning so as to greatly improve the measurement speed and robustness. © 2004 Optical Society of America.

Development of a Refactoring Learning Environment

This paper describes a Refactoring Learning Environment, which is intended to analyze and assess programming code, based on refactoring rules. The Refactoring Learning Environment architecture includes an intelligent assistant – Refactoring Agent, which is responsible for analysis and assessment of the code, written by students in real time by using a set of refactoring methods. According to the situation and based on the refactoring method, which should be applied, the agent could react in different ways. Its goal is to show the student, as much as possible, the weak places of his programming code and the possible ways to makes it better.

Study of the Self-Assessment as а Component of the Model of Self-Regulated Learning for Engineering Students

Report published in the Proceedings of the National Conference on "Education and Research in the Information Society", Plovdiv, May, 2015

Netnográfia avagy on-line karosszék-etnográfia a marketingkutatásban (Netnography or Online armchair etnography in the marketing research)

A netnográfia olyan kvalitatív kutatási módszer, amely adaptálja az etnográfiai kutatási technikákat az on-line közösségek kultúrájának vizsgálatához (Kozinets, 2002). Információforrásként nyilvánosan elérhető on-line kommunikációs csatornákat használ, hogy azonosítsa és megértse az on-line fogyasztói csoportok gondolkodásmódját és döntési mechanizmusait, egyszersmind egyszerűen és hatékonyan használható eszköz. A netnográfia bizonyos szempontból az úgynevezett karosszék-antropológiára vezethető vissza. A szerzők cikkükben bemutatják a módszer eredetét és használatát. / _____ / Netnography is a qualitative research methodology that adopts ethnographic research techniques to study the culture of online communities (Kozinets, 2002). Netnography uses publicly available online forums to identify and understand way of thinking and decisions of online consumer groups. It is a simple and effective method. Netnography originates in so called „armchair anthropology”. In this paper we present the roots and usage of the method.

Az on-line világban hagyott virtuális lábnyomokban rejlő információk és azok veszélyei (In on-line world leaven virtual footprints information and those dangers)

A mindennapi, szinte folyamatos jelenlét a hálózaton számos melléktermékkel jár. Minden bejelentkezés, üzenet, vásárlás, akció adatok tömegét hagyja az interneten. A cikkben arra kívánnak a szerzők rámutatni, hogy ezeket az adatokat valaki vagy valakik összegyűjthetik, és esetleg olyasmire is használhatják, amihez nem járulnánk hozzá, ha ezt megkérdeznék. A szerzők nem foglalkoznak a rosszindulatú, esetleg bűntények elkövetésének céljára történő illegális adatgyűjtéssel, illetve -hasznosítással, azt kívánták bemutatni, hogy teljesen legális, ún. „white hat” eszközökkel is tartalmas felhasználói profilt lehet összeállítani. Szót ejtenek arról is, hogyan lehet megnehezíteni azok dolgát, akik rólunk szeretnének információt gyűjteni. ____ Everyday, almost continuous presence on the web results number of by-products. Each login, message, shopping, action leaves mass of data on the internet. In this article, the authors wish to point out that these data may be collected by somebody or somebodies. They wanted to introduce you that a meaningful user profile can be compiled by completely legal, so-called „White hat”tools. It also notes about how you can make more difficult their job, who would like to collect information from us.

Termékek és szolgáltatások vásárlása on-line. Vajon mások az elvárások?

Az on-line vásárlás a kiskereskedelem napjaink egyik legdinamikusabban fejlődő területe. Az elmúlt években számos tanulmány foglalkozott az elektronikus kiskereskedelem marketingszempontú vizsgálatával, azonban ez idáig kevesen foglalkoztak a termékeket és szolgáltatásokat vásárlók elkülönült vizsgálatával. A szerzők célja, hogy egy kvantitatív kutatás alapján a minőségészleléssel és elégedettséggel összefüggésben megvizsgálják az újravásárlási, illetve a továbbajánlási szándék alakulását konkrét e-kiskereskedelmi vásárlások – termékek vagy szolgáltatások vásárlása – esetében. Eredményeik alapján megállapítható, hogy a szolgáltatást on-line vásárlók esetében az elégedettség hatása a továbbajánlási és újravásárlási szándékra alacsonyabb szintet mutat, mint a terméket vásárlók esetében. A minőségészleléshez kapcsolódó dimenziók között is megfigyelhető egy releváns eltérés: a terméket vásárlók esetében az ügyfélszolgálat relevanciájában a minőségészlelés során, kvázi, azokban az esetekben, amikor a vásárlás után hátra van még a tényleges kiszállítás vagy kézhezvétel. A rendelkezésükre álló minta nagysága miatt elemzésük során a varianciaalapú modellezést (PLS-SEM) használták.

Emotions and Their Effect on Adult Learning: A Constructivist Perspective

Adult educators are only beginning to understand the interaction between learning and emotion (Dirkx, 2006; O’Regan, 2003). Understanding these concepts and their interaction through the constructivist perspective presents a unique opportunity to appreciate the learner’s perspective and the construction of knowledge through experience.

Patterns and effects of notetaking by learning -disabled and nondisabled adolescents: A comparative study

This study analyzes the qualitative and quantitative patterns of notetaking by learning disabled (LD) and nondisabled (ND) adolescents and the effectiveness of notetaking and review as measured by the subjects' ability to recall information presented during a lecture. The study also examines relationships between certain learner characteristics and notetaking. The following notetaking variables were investigated: note completeness, number of critical ideas recorded, levels of processing information, organizational strategies, fluency of notes, and legibility of notes. The learner characteristics examined pertained to measures on achievement, short-term memory, listening comprehension, and verbal ability.^ Students from the 11th and 12th grades were randomly selected from four senior high schools in Dade County, Florida. Seventy learning disabled and 79 nondisabled subjects were shown a video tape lecture and required to take notes. The lecture conditions controlled for presentation rate, prior knowledge, information density, and difficulty level. After 8 weeks, their notes were returned to the subjects for a review period, and a posttest was administered.^ Results of this study suggest significant differences (p $\le$.01) in the patterns of notetaking between LD and ND groups not due to differences in the learner characteristics listed above. In addition, certain notetaking variables such as process levels, number of critical ideas, and note completeness were found to be significantly correlated to learning outcome. Further, deficiencies in the spontaneous use of organizational strategies and abbreviations adversely affected the notetaking effectiveness of learning disabled students.^ Both LD and ND subjects recalled more information recorded in their notes than not recorded. This difference was significant only for the ND group. By contrast, LD subjects compensated for their poor notetaking skills and recalled significantly more information not recorded on their notes than did ND subjects. The major implications of these findings suggest that LD and ND subjects exhibit very different entry behaviors when asked to perform a notetaking task; hence, teaching approaches to notetaking must differ as well. ^

Outdoor experiential team -building and the college adjustment and persistence of freshmen in learning communities

Student retention is a primary goal in all higher education institutions. Students who are more adjusted to college life are more likely to persist. The purpose of this research was to determine the effects of an outdoor experiential team-building program on the college adjustment of first-semester freshmen in learning communities at a diverse, urban university. The participants in this quasi-experimental study were first-semester freshmen enrolled in learning communities. A total of 123 students participated, with 61 students in the experimental group and 62 students in the comparison group. There were no significant differences between the two groups in relation to age, gender, or ethnicity. The students in the experimental group participated in the team-building program, which consisted of three events spaced three and four weeks apart. At the end of the semester, students in both the experimental and comparison groups completed the Student Adaptation to College Questionnaire (SACQ), a 67-item self-report survey. ^ Independent samples t-test of the SACQ scores (for attachment to the institution, social adjustment, and overall adaptation to college) between groups was done, and the analyses revealed no statistically significant differences. Chi-square analyses revealed no significant difference in the enrollment pattern between the two groups over a four-year period. Repeated measures ANOVAs revealed that from the first semester of enrollment to the second semester there was a significant drop in GPA for students from the comparison group and no such drop in GPA for students from the experimental group who had participated in at least two of the team building activities. A repeated measures ANOVA was conducted for the first year by semester and ethnicity. No ethnic differences were found, and no interaction was found by ethnicity and semester. ^ Should colleges and universities continue to utilize outdoor experiential team-building programs as a creative way to influence students' connection to the institution they should further investigate its value on students' adjustment to college. Future studies should also consider other variables influenced by team-building programs that affect students' college adjustment, such as collaborative learning. Faculty should be included in the planning process to increase their participation. ^

On-Line Real-Time Service-Oriented Task Scheduling Using TUF

We present our approach to real-time service-oriented scheduling problems with the objective of maximizing the total system utility. Different from the traditional utility accrual scheduling problems that each task is associated with only a single time utility function (TUF), we associate two different TUFs—a profit TUF and a penalty TUF—with each task, to model the real-time services that not only need to reward the early completions but also need to penalize the abortions or deadline misses. The scheduling heuristics we proposed in this paper judiciously accept, schedule, and abort real-time services when necessary to maximize the accrued utility. Our extensive experimental results show that our proposed algorithms can significantly outperform the traditional scheduling algorithms such as the Earliest Deadline First (EDF), the traditional utility accrual (UA) scheduling algorithms, and an earlier scheduling approach based on a similar model.

Validation study of the Colorado Learning Attitudes about Science Survey at a Hispanic-serving institution

The Colorado Learning Attitudes about Science Survey (CLASS) has been widely acknowledged as a useful measure of student cognitive attitudes about science and learning. The initial University of Colorado validation study included only 20% non-Caucasian student populations. In this Brief Report we extend their validation to include a predominately under-represented minority population. We validated the CLASS instrument at Florida International University, a Hispanic-serving institution, by interviewing students in introductory physics classes using a semistructured protocol, examining students’ responses on the CLASS item statements, and comparing them to the items’ intended meaning. We find that in our predominately Hispanic population, 94% of the students’ interview responses indicate that the students interpret the CLASS items correctly, and thus the CLASS is a valid instrument. We also identify one potentially problematic item in the instrument which one third of the students interviewed consistently misinterpreted.

Antecedentes da intenção de uso de comentários de viagem on-line na escolha de um meio de hospedagem

The Internet is present in each step of a trip planning. The constant technological advances has made major changes in the tourism industry. This is noticeable by the growing number of people who share their travel experiences on the Internet. This study has aimed to analyze the factors that influence the use of the Online Travel Reviews (OTR) in choosing an accommodation. It was done an investigation into the comments available on the internet about information on touristic products and services, specifically about accommodations. The research proposed to understand the influencing factors of OTR, in the Brazilian context, through the Technology Acceptance Model, Motivational Theory, Similarity, and Trustworthiness. The methodology used was a descriptive-exploratory study, with a quantitative approach, and bibliographic research. The study used a Structural Equation Modeling technique called Partial Least Squares (PLS), to test and evaluate the proposed research model. Data collection was performed with 308 guests hosted in five hotels in Ponta Negra (Natal/RN), who have used the OTRs in choosing an accommodation. The research tested fifteen hypotheses, where nine were confirmed, and six were rejected. The results showed that guests have attitude and intention to use the OTRs to choose an accommodation.

Derivation of base-line geochemistry, petrography, and isotopic data for the host rocks to the Lucky Strike deposit and comparison with data from other alteration zones, Buchans Mining Camp, Newfoundland

The Buchans ore bodies of central Newfoundland represent some of the highest grade VMS deposits ever mined. These Kuroko-type deposits are also known for the well developed and preserved nature of the mechanically transported deposits. The deposits are hosted in Cambro-Ordovician, dominantly calc-alkaline, bimodal volcanic and epiclastic sequences of the Notre Dame Subzone, Newfoundland Appalachians. Stratigraphic relationships in this zone are complicated by extensively developed, brittledominated Silurian thrust faulting. Hydrothermal alteration of host rocks is a common feature of nearly all VMS deposits, and the recognition of these zones has been a key exploration tool. Alteration of host rocks has long been described to be spatially associated with the Buchans ore bodies, most notably with the larger in-situ deposits. This report represents a base-line study in which a complete documentation of the geochemical variance, in terms of both primary (igneous) and alteration effects, is presented from altered volcanic rocks in the vicinity of the Lucky Strike deposit (LSZ), the largest in-situ deposit in the Buchans camp. Packages of altered rocks also occur away from the immediate mining areas and constitute new targets for exploration. These zones, identified mostly by recent and previous drilling, represent untested targets and include the Powerhouse (PHZ), Woodmans Brook (WBZ) and Airport (APZ) alteration zones, as well as the Middle Branch alteration zone (MBZ), which represents a more distal alteration facies related to Buchans ore-formation. Data from each of these zones were compared to those from the LSZ in order to evaluate their relative propectivity. Derived litho geochemical data served two functions: (i) to define primary (igneous) trends and (ii) secondary alteration trends. Primary trends were established using immobile, or conservative, elements (i. e., HFSE, REE, Th, Ti0₂, Al₂0₃, P₂0₅). From these, altered volcanic rocks were interpreted in terms of composition (e.g., basalt - rhyodacite) and magmatic affinity (e.g., calc-alkaline vs. tholeiitic). The information suggests that bimodality is a common feature of all zones, with most rocks plotting as either basalt/andesite or dacite (or rhyodacite); andesitic senso stricto compositions are rare. Magmatic affinities are more varied and complex, but indicate that all units are arc volcanic sequences. Rocks from the LSZ/MBZ represent a transitional to calc-alkalic sequence, however, a slight shift in key geochemical discriminants occurs between the foot-wall to the hanging-wall. Specifically, mafic and felsic lavas of the foot-wall are of transitional (or mildly calc-alkaline) affinity whereas the hanging-wall rocks are relatively more strongly calc-alkaline as indicated by enriched LREE/HREE and higher ZrN, NbN and other ratios in the latter. The geochemical variations also serve as a means to separate the units (at least the felsic rocks) into hanging-wall and foot-wall sequences, therefore providing a valuable exploration tool. Volcanic rocks from the WBZ/PHZ (and probably the APZ) are more typical of tholeiitic to transitional suites, yielding flatter mantlenormalized REE patterns and lower ZrN ratios. Thus, the relationships between the immediate mining area (represented by LSZ/MBZ) and the Buchans East (PHZ/WBZ) and the APZ are uncertain. Host rocks for all zones consist of mafic to felsic volcanic rocks, though the proportion of pyroclastic and epiclastic rocks, is greatest at the LSZ. Phenocryst assemblages and textures are common in all zones, with minor exceptions, and are not useful for discrimination purposes. Felsic rocks from all zones are dominated by sericiteclay+/- silica alteration, whereas mafic rocks are dominated by chlorite- quartz- sericite alteration. Pyrite is ubiquitous in all moderately altered rocks and minor associated base metal sulphides occur locally. The exception is at Lucky Strike, where stockwork quartzveining contains abundant base-metal mineralization and barite. Rocks completely comprised of chlorite (chloritite) also occur in the LSZ foot-wall. In addition, K-feldspar alteration occurs in felsic volcanic rocks at the MBZ associated with Zn-Pb-Ba and, notably, without chlorite. This zone represents a peripheral, but proximal, zone of alteration induced by lower temperature hydrothermal fluids, presumably with little influence from seawater. Alteration geochemistry was interpreted from raw data as well as from mass balanced (recalculated) data derived from immobile element pairs. The data from the LSZ/MBZ indicate a range in the degree of alteration from only minor to severe modification of precursor compositions. Ba tends to show a strong positive correlation with K₂0, although most Ba occurs as barite. With respect to mass changes, Al₂0₃, Ti0₂ and P₂0₅ were shown to be immobile. Nearly all rocks display mass loss of Na₂O, CaO, and Sr reflecting feldspar destruction. These trends are usually mirrored by K₂0-Rb and MgO addition, indicating sericitic and chloritic alteration, respectively. More substantial gains ofK₂0 often occur in rocks with K-feldspar alteration, whereas a few samples also displayed excessive MgO enrichment and represent chloritites. Fe₂0₃ indicates both chlorite and sulphide formation. Si0₂ addition is almost always the case for the altered mafic rocks as silica often infills amygdules and replaces the finer tuffaceous material. The felsic rocks display more variability in Si0₂. Silicic, sericitic and chloritic alteration trends were observed from the other zones, but not K-feldspar, chloritite, or barite. Microprobe analysis of chlorites, sericites and carbonates indicate: (i) sericites from all zones are defined as muscovite and are not phengitic; (ii) at the LSZ, chlorites ranged from Fe-Mg chlorites (pycnochlorite) to Mg-rich chlorite (penninite), with the latter occurring in the stockwork zone and more proximal alteration facies; (iii) chlorites from the WBZ were typical of those from the more distal alteration facies of the LSZ, plotting as ripidolite to pycnochlorite; (iv) conversely, chlorite from the PHZ plot with Mg-Al-rich compositions (chlinochlore to penninite); and (v) carbonate species from each zone are also varied, with calcite occurring in each zone, in addition to dolomite and ankerite in the PHZ and WBZ, respectively. Lead isotope ratios for galena separates from the different various zones, when combined with data from older studies, tend to cluster into four distinctive fields. Overall, the data plot on a broad mixing line and indicate evolution in a relatively low-μ environment. Data from sulphide stringers in altered MBZ rocks, as well as from clastic sulphides (Sandfill prospect), plot in the Buchans ore field, as do the data for galena from altered rocks in the APZ. Samples from the Buchans East area are even more primitive than the Buchans ores, with lead from the PHZ plotting with the Connel Option prospect and data from the WBZ matching that of the Skidder prospect. A sample from a newly discovered debris flow-type sulphide occurrence (Middle Branch East) yields lead isotope ratios that are slightly more radiogenic than Buchans and plot with the Mary March alteration zone. Data within each cluster are interpreted to represent derivation from individual hydrothermal systems in which metals were derived from a common source.

Marketingmérés – két eset az on-line marketing világából

A marketing mérhetőségével kapcsolatos igény nem új keletű jelenség, de elmondhatjuk: napjainkban mind erőteljesebb követelményként jelenik meg a gyakorló szakemberek előtt. Az on-line világ megjelenésével korábban többen a metrikák gyors fejlődését és a fogalmi kérdéskörben meglevő, számos homályos pont tisztázását várták. Bár az elmúlt években valóban sikerült tényszerű előrehaladást elkönyvelni, a várt áttörés - egyelőre - továbbra is csak várat magára. A szerző kutatásában - a kapcsolódó elméleti háttér áttekintését követően - két részterületet igyekszik megvilágítani, két rövid eset keretében. Egy B2B piacon mozgó vállalkozás keresőmarketing-költéseit elsősorban nyelvi-szemantikai elemzésnek vetette alá. Napjaink másik fontos és gyakran emlegetett területe a közösségi média. Itt egy nonprofit szervezet tevékenységét vizsgálta meg, a kutatási fókusz a törzsközönség attitűdje és a közzétett üzenetek hatékonysága közötti kapcsolat feltárása volt.

As práticas comunicacionais do pós-venda: o SAC na era das redes sociais on-line

Estudo sobre as práticas comunicacionais da área de pós-vendas nas redes sociais on-line, com relação ao atendimento das empresas e os canais por elas disponibilizados para interação com o consumidor. Dentre as etapas, realizou-se uma análise sobre os hábitos dos consumidores de realizar buscas nas redes socais on-line; com o intuito de chamar a atenção das empresas sobre problemas de pós-venda nestes canais (reclamações, dúvidas técnicas, sugestões etc.). O objetivo principal foi elaborar de forma cronológica e estruturada a práticas de comunicação no pós-venda por meio dos diversos canais do SAC; resgatando as fases evolutivas do SAC, a lei de proteção do consumidor, desde a era analógica (sem acesso à internet e espontânea), até a chegada das redes sociais on-line. Para tal estudo foram realizados: levantamento bibliográfico, exploratório e documental sobre a área de pós-venda, marketing de relacionamento e de resultados de pesquisas sobre os hábitos dos consumidores conectados à internet; apresentação de casos que exemplificam as práticas comunicacionais do mercado; entrevista aplicada com oito especialistas do mercado; e formulário eletrônico aplicado com gestores das centrais de atendimento. Com todas essas análises, foi possível traçar um diagnóstico sobre a realidade atual da área de atendimento ao cliente das empresas selecionadas, nas redes sociais on-line, além de reforçar sensivelmente a ideia do consumidor produtor de conteúdo (prosumer) e a mudança no fluxo comunicacional consumidor versus empresa.