Individual versus interactive task-based performance through voice-based computer-mediated communication

Interaction is a necessary condition for second language (L2) learning (Long, 1980, 1996). Research in computer-mediated communication has shown that interaction opportunities make learners pay attention to form in a variety of ways that promote L2 learning. This research has mostly investigated text-based rather than voice-based interaction. The present study applied "form-focusing information gap tasks" (Pica, Kang, & Sauro, 2006) to a voice-based computer-mediated environment and investigated whether individual or interactive task performance conditions affect language development differently. This is a relevant research question for distance language learning programs, which are primarily asynchronous and largely rely on individual performance and text-based communication. The results of the study showed significant pre-to-post learning gains under both performance conditions (individual and interactive). Between-groups comparisons further showed that participants in the interactive condition outperformed participants in the individual condition on two of the three target structures investigated.La interacción es una condición necesaria para el aprendizaje de un segundo idioma (L2) (Long, 1980, 1996). La investigación en comunicación mediada por ordenador ha demostrado que las oportunidades de interacción hacen que los estudiantes presten atención a la forma en una variedad de formas que promueven el aprendizaje de L2. Esta investigación ha investigado principalmente la interacción basada en texto en lugar de la basada en voz. El presente estudio aplicó "tareas enfocadas en la brecha de información" (Pica, Kang y Sauro, 2006) a un entorno de ordenador basado en voz e investigó si las condiciones de rendimiento de tareas individuales o interactivas afectan el desarrollo del lenguaje de manera diferente. Esta es una pregunta de investigación relevante para los programas de aprendizaje de idiomas a distancia, que son principalmente asincrónicos y se basan principalmente en el rendimiento individual y la comunicación basada en texto. Los resultados del estudio mostraron ganancias significativas de aprendizaje pre y post en ambas condiciones de rendimiento (individual e interactivo). Las comparaciones entre los grupos mostraron además que los participantes en la condición interactiva superaron a los participantes en la condición individual en dos de las tres estructuras diana investigadas.La interacció és una condició necessària per a l'aprenentatge d'un segon idioma (L2) (Long, 1980, 1996). La investigació en comunicació mediada per ordinador ha demostrat que les oportunitats d'interacció fan que els estudiants prestin atenció a la forma en una varietat de formes que promouen l'aprenentatge de L2. Aquesta investigació ha investigat principalment la interacció basada en text en lloc de la basada en veu. El present estudi va aplicar "tasques enfocades en la bretxa d'informació" (Pica, Kang i Sauro, 2006) a un entorn d'ordinador basat en veu i va investigar si les condicions de rendiment de tasques individuals o interactives afecten el desenvolupament del llenguatge de manera diferent. Aquesta és una pregunta d'investigació rellevant per als programes d'aprenentatge d'idiomes a distància, que són principalment asincrònics i es basen principalment en el rendiment individual i la comunicació basada en text. Els resultats de l'estudi van mostrar guanys significatius d'aprenentatge pre i post en ambdues condicions de rendiment (individual i interactiu). Les comparacions entre els grups van mostrar a més que els participants en la condició interactiva van superar als participants en la condició individual en dues de les tres estructures diana investigades

A Multi-APD readout for EL detectors

Detectors with an electroluminesence readout show an excellence performance in respect of energy resolution making them interesting for various applications as X-ray detection, double beta and dark matter experiments, Compton and gamma cameras, etc. In the following the study of a readout based on avalanche photo diodes to detect directly the VUV photons is presented. Results of measurements with 5 APDs in xenon at pressures between 1 and 1.65 bar are shown indicating that such a readout can provide excellent energy and a moderate position resolution.Comment: Talk given at the 5th Symposium on Large TPCs for Low Energy Rare Events. Submitted to JPCS (Journal of Physics: Conference Series) for publication. 8 pages, 17 figure

Examining the LLAMA aptitude tests

This study assesses the reliability1 of the LLAMA aptitude tests (Meara, 2005). The LLAMA tests were designed as shorter, free, language-neutral tests loosely based on the MLAT tests (Carroll & Sapon, 1959). They contain four sub-components: vocabulary acquisition, sound recognition, sound-symbol correspondence and grammatical inferencing. Granena (2013) and Rogers et al. (2016) provided initial results regarding factors which might influence LLAMA test scores. This paper develops this previous work by examining some of issues raised with a larger cohort and focuses on the following research questions. 1. Are the LLAMA tests language neutral?2. What is the effect of bilingualism on LLAMA test scores?3. What is the effect of age on LLAMA test scores?4. How much variance can background factors account for in the LLAMA test results? Data were collected from 240 participants aged 10–75 for RQ1–3. We found no significant differences in terms of language background (RQ1) but instructed second language learners significantly outperformed monolinguals (RQ2). For RQ3 we found that the younger groups were outperformed by all the other groups. For RQ4, we investigated how much variance in LLAMA test results six individual background factors could explain. We combined data from Rogers et al. (2016) and this study giving 404 participants in total. Using a multiple regression analysis, we found that prior L2 instruction predicted more of the variance (6%) than any other factor. We suggest that when using the LLAMA tests, researchers should consider controlling for language learning experience. This study scrutinises the components of the LLAMA tests with a large set of data. We conclude that the results are robust across a range of individual differences but suggest that different norms may be needed for younger age groups and those who have received prior L2 instruction

Video-based interaction, negotiation for comprehensibility, and second language speech learning: a longitudinal study

The current study examined the impact of video-based conversational interaction on the longitudinal development (one academic semester) of second language (L2) production by college-level Japanese English-as-a-foreign-language learners. Students in the experimental group engaged in weekly, dyadic conversation exchanges with native speakers in the US via telecommunication tools, wherein the native speaking interlocutors were trained to provide interactional feedback in the form of recasts when the non-native speakers’ utterances hindered successful understanding (i.e., negotiation for comprehensibility). The students in the comparison group received regular foreign language instruction without any interaction with native speakers. The video-coded data showed that the experimental students incidentally worked on improving all linguistic domains of language, thanks to their native speaking interlocutors’ interactional feedback (recasts, negotiation) during the treatment. The pre-/post-test data led to significant gains in their comprehensibility, fluency and lexicogrammar, but not in the accentedness and pronunciation dimensions of their spontaneous production abilitie

A novel potent Fas agonist for selective depletion of tumor cells in hematopoietic transplants

There remains a clear need for effective tumor cell purging in autologous stem cell transplantation (ASCT) where residual malignant cells within the autograft contribute to disease relapse. Here we propose the use of a novel Fas agonist with potent pro-apoptotic activity, termed MegaFasL, as an effective ex-vivo purging agent. MegaFasL selectively kills hematological cancer cells from lymphomas and leukemias and prevents tumor development at concentrations that do not reduce the functional capacity of human hematopoietic stem/progenitor cells both in in vitro and in in vivo transplantation models. These findings highlight the potential use of MegaFasL as an ex-vivo purging agent in ASCT

Experience effects on the development of late second language learners’ oral proficiency

The aim of this study is to evaluate the effects of language experience—operationalized as length of residence—on late second language learners. Data collected from 65 participants consists of three groups of Japanese learners of English (n = 13 Short-, Mid-, Long-LOR Groups, respectively) and two groups of baseline speakers (n = 13 for inexperienced Japanese speakers and native English speakers, respectively). The global quality of their spontaneous speech production was initially judged by 10 native speaking raters of English based on accentedness (linguistic nativelikeness) and comprehensibility (ease of understanding), and then submitted to segmental, prosodic, temporal, lexical, and grammatical analyses. According to the results, LOR was generally predictive of improved L2 comprehensibility as a result of the continuous development of good prosody, optimal speech rate, and proper lexicogrammar usage, while a great amount of L2 experience was required to enhance accentedness, which entailed refined segmental accuracy, vocabulary richness, and grammatical complexity. These results, in turn, suggest L2 learners continue to improve L2 oral proficiency over an extensive period of L2 immersion (e.g., 6 years of LOR), and they do so by paying selective attention to certain linguistic domains closely linked to comprehensibility—but not necessarily relevant to accentedness—for the purpose of successful L2 communication

Factors Affecting Grammatical and Lexical Complexity of Long-Term L2 Speakers’ Oral Proficiency

There remains considerable disagreement about which factors drive second language (L2) ultimate attainment. Age of onset (AO) appears to be a robust factor, lending support to theories of maturational constraints on L2 acquisition. The present study is an investigation of factors that influence grammatical and lexical complexity at the stage of L2 ultimate attainment. Grammatical and lexical complexity were assessed in 102 spontaneous oral interviews. Interviewees' AOs ranged from 7 to 17 years old. Multifactorial analyses yielded consistently significant effects of gender and level of education for grammatical and lexical complexity. Additionally, native language use at work was a significant predictor for lexical complexity; conversely, AO did not emerge as a significant factor. We conclude that grammatical and lexical complexity at the stage of L2 ultimate attainment is the result of a complex interplay of variables that are general to language learning and performance rather than L2 specific

Mobile Asteroid Surface Scout (MASCOT) - Design, Development and Delivery of a Small Asteroid Lander Aboard Hayabusa2

MASCOT is a small asteroid lander launched on December 3rd, 2014, aboard the Japanese HAYABUSA2 asteroid sample-return mission towards the 980 m diameter C-type near-Earth asteroid (162173) 1999 JU3. MASCOT carries four full-scale asteroid science instruments and an uprighting and relocation device within a shoebox-sized 10 kg spacecraft; a complete lander comparable in mass and volume to a medium-sized science instrument on interplanetary missions. Asteroid surface science will be obtained by: MicrOmega, a hyperspectral near- to mid-infrared soil microscope provided by IAS; MASCAM, a wide-angle Si CMOS camera with multicolour LED illumination unit; MARA, a multichannel thermal infrared surface radiometer; the magnetometer, MASMAG, provided by the Technical University of Braunschweig. Further information on the conditions at or near the lander‘s surfaces is generated as a byproduct of attitude sensors and other system sensors. MASCOT uses a highly integrated, ultra-lightweight truss-frame structure made from a CFRP-foam sandwich. It has three internal mechanisms: a preload release mechanism, to release the structural preload applied for launch across the separation mechanism interface; a separation mechanism, to realize the ejection of MASCOT from the semi-recessed stowed position within HAYABUSA2; and the mobility mechanism, for uprighting and hopping. MASCOT uses semi-passive thermal control with Multi-Layer Insulation, two heatpipes and a radiator for heat rejection during operational phases, and heaters for thermal control of the battery and the main electronics during cruise. MASCOT is powered by a primary battery during its on-asteroid operational phase, but supplied by HAYABUSA2 during cruise for check-out and calibration operations as well as thermal control. All housekeeping and scientific data is transmitted to Earth via a relay link with the HAYABUSA2 main-spacecraft, also during cruise operations. The link uses redundant omnidirectional UHF-Band transceivers and patch antennae on the lander. The MASCOT On-Board Computer is a redundant system providing data storage, instrument interfacing, command and data handling, as well as autonomous surface operation functions. Knowledge of the lander’s attitude on the asteroid is key to the success of its uprighting and hopping function. The attitude is determined by a threefold set of sensors: optical distance sensors, photo electric cells and thermal sensors. A range of experimental sensors is also carried. MASCOT was build by the German Aerospace Center, DLR, with contributions from the French space agency, CNES. The system design, science instruments, and operational concept of MASCOT will be presented, with sidenotes on the development of the mission and its integration with HAYABUSA2