892 research outputs found
ANALISIS FAKTOR-FAKTOR YANG MEMPENGARUHI SISWA DALAM PEMILIHAN PROGRAM KEAHLIAN DI SMK PGRI TANJUNG RAJA
The objective of the research was to find out factors contributing students in choosing the vocational programs at SMK PGRI Tanjung Raja. The method of the research used was quantitative descriptive. The data was collected by using documentation, questionnaire, and skill test. The sample of the research was 45 students. The result of the research indicated that factors contributing students in choosing vocational programs at SMK PGRI Tanjung Raja came from internal and external factors. The internal factors included skills with sufficient criteria of assessment or contributed to the average percentage at 80.33%. It also included the skills with high criteria of assessment or contributed to the average percentage at 85.5%. The external factors included the result of entry score with sufficient criteria of assessment or contributed to the average percentage at 74.42%. Parents were also the external factors with high criteria of assessment or contributed to the average percentage at 87.47%. In other words, both internal and external factors had high criteria of assessment contributing students in choosing vocational programs in SMK PGRI Tanjung Raja which had average percentage at 81.93%
PENGENALAN AKSARA BATAK TOBA MENGGUNAKAN METODE MODIFIED DIRECTION FEATURE DAN LEARNING VECTOR QUANTIZATION
M. IKHSAN HARLIN PRATAMA, (2021): PENGENALAN AKSARA BATAK TOBA MENGGUNAKAN METODE MODIFIED DIRECTION FEATURE DAN LEARNING VECTOR QUANTIZATION
Indonesia memiliki berbagai ragam kebudayaan berdasarkan UNESCO, bahwa budaya memiliki
peran penting dalam sebagian besar Tujuan Pembangunan Berkelanjutan (SDGs) yang berfokus
pada sektor pendidikan dan ilmu pengetahuan yang berkualitas khususnya di daerah batak dengan
mengenal sebuah Aksara (Tulisan) Batak Toba. Kurangnya pemahaman dalam mengenali huruf
dasar Ina Ni Surat aksara batak kerap menjadi kekeliruan dalam mengenali dan membaca tulisan,
maka dibangun sebuah aplikasi untuk mengidentifikasi tulisan Ina Ni Surat aksara batak toba.
Pada penelitian ini, proses ekstraksi ciri yang digunakan adalah metode Modified Direction
Feature (MDF) dan proses klasifikasi yang digunakan metode Learning Vector Quantization
(LVQ). Pengujian dilakukan berdasarkan data merata yaitu, pengujian matriks citra dengan ukuran
120x120 piksel, dan pengujian nilai/learning rate 0.1, 0.01, 0.03, 0.05, 0.07, 0.09, 0.001, 0.003,
0.005, 0.007 dan 0.009. Dari hasil pengujian yang dilakukan adalah aplikasi mampu mengenali
citra tulisan ina ni surat batak toba dengan akurasi terbaik sebesar 87% menggunakan pembagian
data 70:30 dengan learning rate 0.1, 0.07, dan 0.09.
Kata Kunci: Aksara Batak Toba, Ekstraksi Ciri, Learning Vector Quantization (LVQ), Modified
Direction Feature (MDF), Thinnin
Working with simple machines
A set of examples is provided that illustrate the use of work as applied to
simple machines. The ramp, pulley, lever and hydraulic press are common
experiences in the life of a student and their theoretical analysis therefore
makes the abstract concept of work more real. The mechanical advantage of each
of these systems is also discussed so that students can evaluate their
usefulness as machines.Comment: 9 pages, 4 figure
Designing visual management in manufacturing from a user perspective
Many organisations use daily meetings, whiteboards and an information system for employee intra-communication. While Operation Management research is often management centred, Human Centred Design, instead, takes a user’s perspective. This research aims to reflect upon and describe a method, applied in practice in a double case study within manufacturing, on how to (re-)design meetings and visual management boards, and what type of information and key performance indicators are most relevant for the personnel. The paper proposes a lean Kata-improvement inspired design method, which takes the personnel’s perspective on design of daily visual management
Understanding the interactions of cellulose fibres and deep eutectic solvent of choline chloride and urea
This is the author accepted manuscript. The final version is available from Springer Verlag via the DOI in this record.A deep eutectic solvent composed of choline chloride (ChCl) and urea has been recently introduced as a promising cellulose compatible medium that enables e.g. fibre spinning. This paper clarifies the influence of such a solvent system on the structure and chemical composition of the cellulosic pulp fibres. Special emphasis was placed on the probable alterations of the chemical composition due to the dissolution of the fibre components and/or due to the chemical derivatisation taking place during the DES treatment. Possible changes in fibre morphology were studied with atomic force microscopy and scanning electron microscopy. Chemical compositions of pulp fibres were determined from the carbohydrate content, and by analysing the elemental content. Detailed structural characterisation of the fibres was carried out using spectroscopic methods; namely X-Ray Photoelectron Spectroscopy, solid state Nuclear Magnetic Resonance and Raman Spectroscopy. No changes with respect to fibre morphology were revealed and negligible changes in the carbohydrate composition were noted. The most significant change was related to the nitrogen content of the pulp after the DES treatment. Comprehensive examination using spectroscopic methods revealed that the nitrogen originated from strongly bound ChCl residuals that could not be removed with a mild ethanol washing procedure. According to Raman spectroscopic data and methylene blue adsorption tests, the cationic groups of ChCl seems to be attached to the anionic groups of pulp by electrostatic forces. These findings will facilitate the efficient utilisation of DES as a cellulose compatible medium without significantly affecting the native fibre structure.The authors acknowledge the Finnish Funding Agency for Innovation (TEKES) for funding the work via Design Driven Value Chains in the World of Cellulose 2.0 project. The Academy of Finland (Project ID 300367) is acknowledged for enabling the research mobility of T.T. to the University of Exeter, UK. Unto Tapper (VTT) is thanked for the SEM imaging, Atte Mikkelson, Ritva Heinonen and Marita Ikonen (VTT) for the chemical analysis and Robertus Nugroho (Aalto University) for the AFM imaging
<i>C-elegans</i> model identifies genetic modifiers of alpha-synuclein inclusion formation during aging
Inclusions in the brain containing alpha-synuclein are the pathological hallmark of Parkinson's disease, but how these inclusions are formed and how this links to disease is poorly understood. We have developed a <i>C-elegans</i> model that makes it possible to monitor, in living animals, the formation of alpha-synuclein inclusions. In worms of old age, inclusions contain aggregated alpha-synuclein, resembling a critical pathological feature. We used genome-wide RNA interference to identify processes involved in inclusion formation, and identified 80 genes that, when knocked down, resulted in a premature increase in the number of inclusions. Quality control and vesicle-trafficking genes expressed in the ER/Golgi complex and vesicular compartments were overrepresented, indicating a specific role for these processes in alpha-synuclein inclusion formation. Suppressors include aging-associated genes, such as sir-2.1/SIRT1 and lagr-1/LASS2. Altogether, our data suggest a link between alpha-synuclein inclusion formation and cellular aging, likely through an endomembrane-related mechanism. The processes and genes identified here present a framework for further study of the disease mechanism and provide candidate susceptibility genes and drug targets for Parkinson's disease and other alpha-synuclein related disorders
Structure of Be probed via secondary beam reactions
The low-lying level structure of the unbound neutron-rich nucleus Be
has been investigated via breakup on a carbon target of secondary beams of
B at 35 MeV/nucleon. The coincident detection of the beam velocity
Be fragments and neutrons permitted the invariant mass of the
Be+ and Be++ systems to be reconstructed. In the case of
the breakup of B, a very narrow structure at threshold was observed in
the Be+ channel. Contrary to earlier stable beam fragmentation
studies which identified this as a strongly interacting -wave virtual state
in Be, analysis here of the Be++ events demonstrated that
this was an artifact resulting from the sequential-decay of the
Be(2) state. Single-proton removal from B was found to
populate a broad low-lying structure some 0.70 MeV above the neutron-decay
threshold in addition to a less prominent feature at around 2.4 MeV. Based on
the selectivity of the reaction and a comparison with (0-3)
shell-model calculations, the low-lying structure is concluded to most probably
arise from closely spaced J=1/2 and 5/2 resonances
(E=0.400.03 and 0.85 MeV), whilst the broad
higher-lying feature is a second 5/2 level (E=2.350.14 MeV). Taken
in conjunction with earlier studies, it would appear that the lowest 1/2
and 1/2 levels lie relatively close together below 1 MeV.Comment: 14 pages, 13 figures, 2 tables. Accepted for publication in Physical
Review
Biodegradable nanomats produced by electrospinning : expanding multifunctionality and potential for tissue engineering
With increasing interest in nanotechnology, development of nanofibers (n-fibers) by using the
technique of electrospinning is gaining new momentum. Among important potential applications of
n-fiber-based structures, scaffolds for tissue-engineering represent an advancing front. Nanoscaffolds
(n-scaffolds) are closer to natural extracellular matrix (ECM) and its nanoscale fibrous structure.
Although the technique of electrospinning is relatively old, various improvements have been
made in the last decades to explore the spinning of submicron fibers from biodegradable polymers
and to develop also multifunctional drug-releasing and bioactive scaffolds. Various factors can
affect the properties of resulting nanostructures that can be classified into three main categories,
namely: (1) Substrate related, (2) Apparatus related, and (3) Environment related factors. Developed
n-scaffolds were tested for their cytocompatibility using different cell models and were seeded
with cells for to develop tissue engineering constructs. Most importantly, studies have looked at the
potential of using n-scaffolds for the development of blood vessels. There is a large area ahead
for further applications and development of the field. For instance, multifunctional scaffolds that
can be used as controlled delivery system do have a potential and have yet to be investigated for
engineering of various tissues. So far, in vivo data on n-scaffolds are scarce, but in future reports
are expected to emerge. With the convergence of the fields of nanotechnology, drug release and
tissue engineering, new solutions could be found for the current limitations of tissue engineering
scaffolds, which may enhance their functionality upon in vivo implantation. In this paper electrospinning
process, factors affecting it, used polymers, developed n-scaffolds and their characterization
are reviewed with focus on application in tissue engineering
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