18,619 research outputs found
Teacher professional learning for technology integration in mathematics classrooms through online learning communities : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Information Technology at Massey University, Albany, New Zealand
The new school curricula in Indonesia emphasise the integration of technology
into instructional practices. The infusion of technology in mathematics education
requires teachers to align their teaching practices with ongoing technological
innovations. Integrating technology into mathematics classrooms requires teachers
to have a good knowledge of mathematics content, technology and pedagogy.
Teachers also need to consider their school environments. Existing teacher
professional development programmes are seen to be failing to meet teacher needs
regarding content delivery that sometimes does not match the existing school
conditions.
The premise underlying this research is that the use of an online learning
community (OLC) may present a possible solution to the current challenges.
Thus, the intention of this study was to investigate the potential of OLCs to help
develop teachers’ learning to fulfil their professional needs in integrating
technology with the teaching of mathematics.
An ethnographic approach was used to investigate the phenomenon of teacher
learning within an OLC and the implementation of the new knowledge acquired in
their mathematics teaching practices. Empirical data from five case studies were
used to examine how participation in the OLC affected teaching practices for five
teachers. The results revealed that teacher participation in an OLC offered
opportunities and challenges. Teachers de-privatized their practices as they
actively engaged in social learning interactions to share knowledge and help each
other with the appropriate use of technology in teaching mathematics. Teachers
also faced some challenges, which impeded them. These challenges included
differences in school policies, such as restrictions on using social media and
limited technical infrastructure, which hindered teachers from fully leveraging the
OLC. Teachers with less experience in teaching with technology and with low
levels of technology skills tended to be passive in the OLC. Cultural contexts
revealed that lack of experience and caution about expressing opinions made
teachers feel ewuh pakewuh, a shyness in openly expressing their thoughts.
Despite these barriers, the study provided evidence that teachers improvised and
dealt with situations as they rose.
The findings of this study provided evidence that participation in the OLC had
significant impacts on teachers’ professional learning. Teachers altered their mode
of using technology either as a partner or as an extension of self as they gained
more confidence in their own learning. The teachers gradually transformed their
participation from peripheral to full participation in promoting the use of
technology for teaching mathematics. The research provides new insights into
ways teachers can be helped to develop their professional learning in the use of
technology for teaching mathematics through participation in OLCs. Particularly
for Indonesia, the findings of this research provide an OLC-based model that
could be implemented in other contexts that share similar technology landscapes
and sociocultural heritages
New extremal binary self-dual codes of length 68 via short kharaghani array over f_2 + uf_2
In this work, new construction methods for self-dual codes are given. The
methods use the short Kharaghani array and a variation of it. These are
applicable to any commutative Frobenius ring. We apply the constructions over
the ring F_2 + uF_2 and self-dual Type I [64, 32, 12]_2-codes with various
weight enumerators obtained as Gray images. By the use of an extension theorem
for self-dual codes we were able to construct 27 new extremal binary self-dual
codes of length 68. The existence of the extremal binary self-dual codes with
these weight enumerators was previously unknown.Comment: 10 pages, 5 table
Kesan penggunaan peta konsep ke atas pencapaian mata pelajaran rekabentuk sistem dalam kalangan pelajar program ijazah sarjana muda teknologi maklumat dan multimedia
Peta konsep adalah satu kaedah persembahan yang menerangkan sesuatu konsep dalam bentuk grafik. Penggunaannya dalam proses pengajaran dan pembelajaran mampu untuk meningkatkan pencapaian pelajar dan mengurangkan pemasalahan di dalam pembelajaran. Kajian ini telah dijalankan untuk mengkaji keberkesanan peta konsep dalam proses pengajaran dan pembelajaran Rekabentuk Sistem bagi pelajar tahun dua semester satu Program Ijazah Saijana Muda Teknologi Maklumat Dan Multimedia. Kajian Kuasi-Eksperimental Bentuk Siri Masa Gangguan Sementara yang dijalankan menggunakan ujian pra dan pos ke atas sampel seramai 25 orang pelajar bagi kumpulan eksperimen dan 25 orang pelajar bagi kumpulan kawalan melalui kawalan secara memadan. Kumpulan eksperimen telah diajar dengan bantuan peta konsep manakala kumpulan kawalan diajar secara konvensional. Instrumen kajian yang digunakan ialah borang soal selidik dan set soalan kuiz. Data dianalisis dengan menggunakan SPSS 16.0 bagi data deskriptif iaitu frekuensi, skor min dan sisihan piawai serta data inferensi melalui Ujian ANOVA sehala. Hasil kajian mendapati bahawa tidak terdapat perbezaan yang signifikan secara statistik Ujian Pra diantara kedua-dua kumpulan (p>0.05) dengan skor min kumpulan eksperimen dan kumpulan kawalan adalah 3.280, manakala terdapat perbezaan yang signifikan secara statistik Ujian Pos diantara kedua-dua kumpulan (p<0.05) dengan skor min tertinggi kumpulan eksperimen adalah 5.760 berbanding kumpulan kawalan iaitu 4.280. Hasil dari kajian ini menunjukkan bahawa penggunaan peta konsep telah meningkatkan keberkesanan pembelajaran Analisis Dan Rekabentuk Sistem. Pelajar juga dapat menerima penggunaan peta konsep dalam proses pengajaran dan pembelajaran
An impulsive noise analyser using amplitude probability distribution (APD) for broadband-wired communication
Electromagnetic interference or noise which is of impulsive nature is known
to affect data communication performance. It is useful to correlate the characteristics
of the noise with the bit error probability (BEP). The amplitude probability
distribution (APD) has been proposed within CISPR for characterisation of the
impulsive noise. However, there is no analyser available to perform direct
measurement of the noise within the bandwidth of asymmetric digital subscriber line
(ADSL2+) communication. This research presents a novel development of APD
analyser for measurements of impulsive noise emission and its impact on ADSL2+
communication. A unique noise APD pattern is obtained from each measurement of
noise emission from different electrical and electronic appliances. It is vital to have
correct measurement set-up, signal power level, sampling rate, sample points and
filter characterisation in order to acquire accurate data representation of the noise
patterns. The APD graph is generated by the analyser using the APD algorithm
method which employs the envelope sampling technique from actual probability. The
noises are characterised using α-stable distribution which exhibits its own distinct
APD parameters. The APD curve can be related with the single modulation scheme
communication channel performance for estimation of bit error probability. The
analyser has been developed successfully with dynamic range of 70 dB higher than
the 60 dB CISPR 16 requirement, 0.02 dB amplitude resolution compared to 0.25 dB
CISPR 16 requirement and 0.59 dB amplitude accuracy compared with the CISPR 16
standard of +/- 2.7 dB. In addition, the limits for noise in copper cable have been
proposed for estimating the severity of the interference towards digital
communication performance in ADSL2+ system. An advantage of the analyser is its
ability to not only record the noise but the ability to regenerate back the noise which
can be used for further analysis. In conclusion, the analyser can provide a comprehensive platform for impulsive noise interference verification towards
ADSL2+ communication performance
Structural behaviour of circular concrete filled steel tube column fill with selfcompacting concrete incorporating coal bottom ash as fine aggregate replacement
Lack of compaction may affect the interaction between the steel tube and the
concrete, hence influence the behaviour of CFST column. Employing selfcompacting
concrete (SCC) in CFST column as an infill concrete remove the
necessity for compaction. However, higher volume of fine aggregate required in SCC
makes SCC less preferable. The objective of this research was to investigate the
behaviour of circular CFST column filled with SCC incorporating coal bottom ash
(CBA) as fine aggregate replacement. In this research work, sand was replaced with
CBA at 10%, 15%, 20%, 25%, and 30% of replacement levels. Tests for compressive
strength, split tensile strength, flexural strength, and water absorption were
performed on specimens at 7 and 28 days curing age. The testing results show that
15% of CBA was the optimum percentage suitable used in SCC. In studying the
behaviour of CFST columns, 18 CFST column specimens were tested to fail under
the axial compression loading. From the experimental results, it can be concluded
that the utilisation of SCC with CBA in the CFST column able to improve the
behaviour of CFST column. From compression testing results, the strength of CFST
column filled with SCC with CBA increased about 45-50%. The experimental results
were also compared with the design standard of Eurocode 4 (EC4). From the
comparison, the EC4 conservatively predicts the strength of the column specimens.
For instance, EC4 conservatively predicted the column strength in series I by about
21-31%. The finite element analysis (FEA) was conducted on the long column to
verify the experimental results and from the FEA result, the predicted value for
specimens with 140 mm diameter is 0.005% closer to the experimental results. These
discoveries are significant as they showed that the utilization of CBA in SCC as an
infill in CFST column able to provide the same strength as CFST with normal SCC.
Besides, the use of CBA as partially replacement to the sand will help in more
sustainable SCC production by lowering energy and raw material consumption
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