6,937 research outputs found
Solomon Benjamin collection 1834, 1864
No full textCollection contains 2 items: an 1864 letter by Calvin --- depicting New Orleans under Union control and describing Solomon Benjamin, brother of Judah P. Benjamin; and an 1834 letter by John M. Clapp of Beaufort, SC, concerning an S. BenjaminGift, in part, of Elsie O. and Philip D. Sang Foundatio
Summative Assessment Practices of Solomon Islands Year Nine Science Teachers
No full textThe aim of this exploratory study was to investigate the perceptions, experiences, and practices of six Solomon Islands secondary science teachers, based on the types of assessment they use in their science classrooms to serve a summative purpose. The study was divided into two parts. The first part involved a baseline study which explored the teachers’ existing summative assessment practices with the intent to understand how their views and knowledge of the summative assessments influenced their practices, and to identify their professional learning needs in creating assessment tools. The second part of the study involved a small-scale professional development intervention, which aimed to enhance the science teachers’ skills and confidence in summative assessment as well as to identify the factors that influenced teachers’ development and transfer of new assessment skills to their classroom practices in the Solomon Islands context.
The study adopted a qualitative-interpretive research approach and used methods of teacher interviews, participant observation and documentary analysis to generate data related to the teachers’ existing summative assessment practices, and the new or revised processes that they adopted as a result of the professional development intervention. Various analytical procedures including thematic analysis procedures and frameworks that researchers have used previously to study teachers’ classroom practices were employed to analyse the collected data.
The findings of the baseline study indicated that the science teachers employed summative assessments to compare students’ ability through grading and reported their students’ achievements to parents and students. The unit test is the dominant form of assessment used by teachers to assess year nine students’ learning, performance and achievements in science. Examinations are administered to students at the end of each school term. An analysis of the test and examination questions indicated that teachers focused on assessing mainly low cognitive skills. Teachers’ views indicated that neither they nor the school leaders have used student achievement results in the past or present time as a basis to review and evaluate their teaching practices or plan ways they might improve student achievement and school performance.
The science teachers generally expressed varying levels of satisfaction in their conduct of assessment activities but also perceived the need for professional support in certain areas of assessment such as construction of a test using a test blueprint, grading, analysis and interpretation of student assessment results. The study also identified a range of factors that influenced the six science teachers’ classroom-based summative assessment practices. Factors that tend to have impacted positively on their summative assessment practices include; their initial teacher education experiences, knowledge and beliefs about teaching, learning and assessment, and colleagues in the school. However, the teachers also reported certain contextual factors that impacted negatively on their assessment practices. These included institutional and extracurricular responsibilities, heavy teaching loads, large class size, lack of clear assessment policy guidelines, lack of exemplary assessment resources, and national examination pressures.
Findings of the impact of professional development intervention indicated that the teachers made small to moderate changes in their summative assessment practice. Their involvement in the group activities during the professional development workshop made them become more reflective on their assessment practices and also indicated that the professional development activities enhanced their knowledge about alternative assessment strategies, and increased their confidence in carrying out summative assessments in class. However, the existing contextual factors that were identified during the baseline study continued to impede their transfer of new assessment ideas and procedures into their classroom practices
Operation range estimation of Reed-Solomon coded SC-FDE system in 60-GHz WPANs
No full textOperation range estimation of Reed-Solomon coded SC-FDE system in 60-GHz WPAN
Erasure Insertion in Reed-Solomon Coded SFH M-ary FSK with Partial-Band Interference and Rayleigh Fading for Non-Coherent Cooperative Communications
No full textThe rationale of our design is that although much of the literature of cooperative systems assumes perfect coherent detection, the assumption of having any channel estimates at the relays imposes an unreasonable burden on the relay station. Hence, non-coherently detected Reed-Solomon (ReS) coded Slow Frequency Hopping (SFH) assisted Mary Frequency Shift Keying (FSK) is proposed for cooperative wireless networks, subjected to both partial-band interference and Rayleigh fading. Erasure insertion (EI) assisted ReS decoding based on the joint maximum output-ratio threshold test (MO-RTT) is investigated in order to evaluate the attainable system performance. Compared to the conventional error-correction-only decoder, the EI scheme may achieve a gain of approximately 3 dB at the Eb/N0 of 10?4, when employing the ReS(31, 20) code combined with 32-FSK modulation. Additionally, we evaluated the system’s performance, when either equal gain combining (EGC) or selection combining (SC) techniques are employed at the destination’s receiver. The results demonstrated that in the presence of one and two assisting relays, the EGC scheme achieves gains of 1.5 dB and 1.0 dB at the Eb/N0 of 10?6, respectively, compared to the SC arrangement
A Reed-Solomon Coded DS-CDMA System Using Noncoherent M-ary Orthogonal Modulation over Multipath Fading Channels
No full textThe performance of Reed–Solomon (RS) coded direct-sequence code division multiple-access (DS-CDMA) systems using noncoherent M-ary orthogonal modulation is investigated over multipath Rayleigh fading channels. Diversity reception techniques with equal gain combining (EGC) or selection combining (SC) are invoked and the related performance is evaluated for both uncoded and coded DS-CDMA systems. "Errors-and-erasures" decoding is considered, where the erasures are based on Viterbi’s so-called ratio threshold test (RTT). The probability density functions (PDF) of the ratio associated with the RTT conditioned on both the correct detection and erroneous detection of the M-ary signals are derived. These PDFs are then used for computing the codeword decoding error probability of the RS coded DS-CDMA system using "errors-and-erasures" decoding. Furthermore, the performance of the "errors-and-erasures" decoding technique employing the RTT is compared to that of "error-correction-only" decoding refraining from using side-information over multipath Rayleigh fading channels. As expected, the numerical results show that when using "errors-and-erasures" decoding, RS codes of a given code rate can achieve a higher coding gain than without erasure information. Index Terms—Direct sequence code division multiple-access, error-correction-only decoding, errors-and-erasures decoding, noncoherent -ary orthogonal signaling, ratio threshold test, Reed–Solomon codes
SC author and illustrator Kate Salley Palmer signing book
No full textPhotograph of SC author and illustrator Kate Salley Palmer signing boo
Book signing by SC author and illustrator Kate Salley Palmer
No full textPhotograph of Book signing by SC author and illustrator Kate Salley Palme
Nonequilibrium electromechanical interactions in cartilage : swelling and electrokinetics
No full textThesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1983.MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERINGIncludes bibliographical references.by Solomon Rivlin Eisenberg.Sc.D
Aspectos da ecologia da paisagem da Ilha do Campeche (Florianópolis-SC): uma contribuição ao manejo insular
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia AmbientalA Ilha do Campeche (Florianópolis-SC) é a maior das ilhas que circundam a Ilha de Santa Catarina, cerca de 1,5 quilômetros desta e possuindo cerca de 531.200 m2. Constitui-se de uma paisagem insular, a qual destaca-se devido da ampla gama de recursos que apresenta, tais como: os recursos naturais (distintas formações vegetais, elementos da avifauna, fauna marinha, entre outros), os recursos histórico-arqueológicos (inscrições rupestres,depósitos de sambaqui, ruínas de antigas construções, entre outros), os recursos paisagísticos, além de usos tradicionais relacionados com a pesca. Diantes desta características, a atividade de turismo vem crescendo consideravelmente na última década, gerando impacto e degradação ambiental, decorrentes do mau uso dos recursos. Neste contexto, o presente trabalho apresenta um estudo de Ecologia da Paisagem, o qual visa contribuir com informações pertinentes a ações de manejo ambiental insular. Tal estudo foi realizado com o uso do Sistem de Informações Geográficas, sendo constituído de quatro etapas: Levantamento e Caracterização dos componenetes da Estrutura da Paisagem; Análise dos Elementos da Estrutura da Paisagem, Aanálise da Paisagem para o Manejo Insular e , Zoneamento Ambiental. A estrutura da Ilha do Campeche é composta por embasamento cristalino e depósito Quaternários, os quais constituem feições de outeiro, interflúvio, terraço estrutural, terraço marinho-eólico, plaino costeiro e praia arenosa. Estes, por sua vez, possuem uma cobertura vegetal distinta, tal como: Floresta Ombrófila Densa, Restinga, Formação Pioneira de Costão Rochoso e Formação Antrópica. A matriz da Paisagem é Floresta Ombrófila Densa, a qual dispõe-se numa mancha alongada no interior da ilha, além desta ainda ocorrem manchas de outros tipos dispostas de maneiras distintas (alongadas, convolutas, entre outros). Tal configuração espacial indica locais com convergência de manchas e recursos naturais, locais com expansão da mancha anatrópica e locais relativamente preservados e isolados da influência antrópica. De acordo com o levamtamento dos regimes de distúrbios naturais, bem como a análise dos usos antrópicos e seus respectivos impactos ambientais, foram identificadas áreas com distintos graus de vulnerabilidade da paisagem, as quais embasaram a elaboração de um zoneamento ambiental. Tal zoneamento propõe seis zonas de manejo, baseadas na análise ecológica da paisagem. Desta forma, o trabalho sugere a priorização de determinadas áreas antrópicas para ações de manejo, além de também indicar as áreas Destinadas à conservação e presevação ambiental
Non-Coherent Cooperative Communications Dispensing with Channel Estimation Relying on Erasure Insertion Aided Reed-Solomon Coded SFH M-ary FSK Subjected to Partial-Band Interference and Rayleigh Fading
No full textThe rationale of our design is that although much of the literature of cooperative systems assumes perfect coherent detection, the assumption of having any channel estimates at the relays imposes an unreasonable burden on the relay station. Hence, non-coherently detected Reed-Solomon (ReS) coded Slow Frequency Hopping (SFH) assisted M -ary Frequency Shift Keying (FSK) is proposed for cooperative wireless networks, subjected to both partial-band interference and Rayleigh fading. Erasure insertion (EI) assisted ReS decoding based on the joint maximum output-ratio threshold test (MO-RTT) is investigated in order to evaluate the attainable system performance. Compared to the conventional error-correction-only decoder, the EI scheme may achieve an Eb/N0 gain of approximately 3dB at the Codeword Error Probability, Pw , of 10-4 , when employing the ReS (31, 20) code combined with 32-FSK modulation. Additionally, we evaluated the system’s performance, when either equal gain combining (EGC) or selection combining (SC) techniques are employed at the destination’s receiver. The results demonstrated that in the presence of one and two assisting relays, the EGC scheme achieves gains of 1.5 dB and 1.0 dB at the Pw of 10-6 , respectively, compared to the SC arrangement. Furthermore, we demonstrated that for the same coding rate and packet size, the ReS (31, 20) code using EI decoding is capable of outperforming convolutional coding, when 32-FSK modulation is considered, whilst LDPC coding had an edge over the above two schemes
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