scholarly journals Improved Accuracy of a Single-Slit Digital Sun Sensor Design for CubeSat Application Using Sub-Pixel Interpolation

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1472
Author(s):  
Fuat Kaan Diriker ◽  
Alexander Frias ◽  
Ki Hwan Keum ◽  
Regina S. K. Lee
Keyword(s):  
Sun Sensor ◽  
Simple Geometry ◽  
Lower Accuracy ◽  
Mask Design ◽  
Slit Size ◽  
Micro Systems ◽  
And Control ◽  
Improved Accuracy ◽  
Pixel Interpolation ◽  
Better Than

In recent years, we have seen significant improvements in the digital sun sensor (DSS) design enabled by advanced micro-systems fabrication and optical sensing technologies. In this paper, we propose a simple single-slit DSS concept with improved accuracy using sub-pixel interpolation. In considering the DSS design, we focused on several characteristics of the sun sensor, including field-of-view, sensor accuracy, complexity, and computational requirements. First, the optimal mask design was determined based on the simple geometry of the slit size, mask height and pixel width. Then, a two-step pixel read-out algorithm was implemented for sub-pixel level interpolation to determine the illumination ratio using 1-, 2-, 4- and 8-bit readouts. Lastly, the improved DSS was integrated with typical CubeSat, commercial-grade attitude sensors suite and a simple TRIAD method to determine the attitude of a CubeSat in LEO. Compared to standard 1-bit read-out mode (0.32 deg RMSE), 8-bit DSS achieves better than 0.01 deg RMSE. In a CubeSat scenario, improvements in attitude knowledge and control accuracy are marginal when using TRIAD, due to the significantly lower accuracy in other CubeSat-scale sensors (magnetometer, for example).

scholarly journals New Cancer Stochastic Models Involving Both Hereditary and Nonhereditary Cancer Cases: A New Approach

2013 ◽  
Vol 2013 ◽  
pp. 1-19
Author(s):  
Wai-Yuan Tan ◽  
Hong Zhou
Keyword(s):  
Cancer Incidence ◽  
Stochastic Models ◽  
Biological Information ◽  
Cancer Genes ◽  
New Approach ◽  
Human Cancers ◽  
Seer Data ◽  
Sampling Procedures ◽  
And Control ◽  
Better Than

To incorporate biologically observed epidemics into multistage models of carcinogenesis, in this paper we have developed new stochastic models for human cancers. We have further incorporated genetic segregation of cancer genes into these models to derive generalized mixture models for cancer incidence. Based on these models we have developed a generalized Bayesian approach to estimate the parameters and to predict cancer incidence via Gibbs sampling procedures. We have applied these models to fit and analyze the SEER data of human eye cancers from NCI/NIH. Our results indicate that the models not only provide a logical avenue to incorporate biological information but also fit the data much better than other models. These models would not only provide more insights into human cancers but also would provide useful guidance for its prevention and control and for prediction of future cancer cases.

scholarly journals THE EFFECTIVENESS OF REALISTIC MATHEMATICS EDUCATION TO IMPROVE STUDENTS’ MULTI-REPRESENTATION ABILITY

2019 ◽  
Vol 8 (1) ◽  
pp. 21 ◽  
Author(s):  
Muhtarom Muhtarom ◽  
Nizaruddin Nizaruddin ◽  
Farida Nursyahidah ◽  
Nurina Happy
Keyword(s):  
Mathematics Education ◽  
Experimental Design ◽  
Learning Process ◽  
Realistic Mathematics Education ◽  
Student Responses ◽  
Realistic Mathematics ◽  
Quasi Experimental ◽  
And Control ◽  
Essay Test ◽  
Better Than

This research aimed to evaluate the effectiveness of Realistic Mathematics Education (RME) to improve students' multi-representation ability. A quasi-experimental design was used in this research. Sixty-four samples from the seventh-grade students of Junior School were randomly selected and divided into two classes: experimental class was treated using RME and control class was treated using conventional learning, with each class consisting of thirty-two students. The essay test was used to measure the multi-representation ability of students and the questionnaire was used to measure students' responses in RME learning. The data from the essay test were analyzed by N-Gain test and t-test in which normality and homogenity test were conducted previously, while the students' learning completeness and student responses were presented descriptive quantitative. The result of the research concluded that the multi-representation ability of students who get RME learning is better than the multi-representation ability in students who get conventional learning. 87.25% of students who get RME learning with the developed device have completed the KKM, and many students are very enthusiastic and interested in RME based learning, thus increasing their learning spirit in a learning process.

scholarly journals IMPLEMENTATION OF MODEL-ELICITING ACTIVITIES TO IMPROVE THE ABILITY OF MATHEMATICAL PROBLEM SOLVING

2018 ◽  
Vol 1 (3) ◽  
pp. 312 ◽  
Author(s):  
Rubaitun Rubaitun
Keyword(s):  
Problem Solving ◽  
Mathematical Problem ◽  
Mathematical Problem Solving ◽  
Homogeneity Test ◽  
Problem Solving Skills ◽  
Normality Test ◽  
Model Eliciting Activities ◽  
Class Viii ◽  
And Control ◽  
Better Than

This study aims to determine whether the improvement of students' mathematical problem solving skills that get the learning of Model-Eliciting Activities is better than students who get regular learning. Method in this research is experiment and research design pretest and postest in experiment and control class. The population in this study were all students of MTs Kota Cimahi. School samples were taken at random, and obtained by MTs Negeri Kota Cimahi. Then the sample is selected two class VIII at random class. The experimental class uses Model-Eliciting Activities, while the control class uses ordinary learning. The hypothesis in this research is the improvement of student solving abilities of MTs students in Cimahi whose learning using Model-Eliciting Activities is better than using ordinary learning. Research data obtained through the instrument of posttest mathematical problem solving ability. The posttest data is processed by normality test, homogeneity test, and two average difference test using SPSS (Statistical Product and Service Solution) software version 16.0 for Windows. The results showed that the improvement of problem solving ability of MTs students in Cimahi whose learning using Model-Eliciting Activities was better than those using ordinary learning.

scholarly journals Enhancement the stability of power system using optimal location of FACTS devices

2020 ◽  
Vol 18 (2) ◽  
pp. 648
Author(s):  
Ali Najim Abdullah ◽  
Ahmed Majeed Ghadhban ◽  
Hayder Salim Hameed ◽  
Husham Idan Hussein
Keyword(s):  
Power Network ◽  
Performance Factors ◽  
Facts Devices ◽  
Clearing Time ◽  
Thyristor Controlled Series Capacitor ◽  
Overall Performance ◽  
Set Up ◽  
The Stability ◽  
And Control ◽  
Better Than

<p><span>This paper proposes a steady-state of the Static Var Compensator (SVC) &amp; Thyristor Controlled Series Capacitor (TCSC) set up for enhancing the damping overall performance and growing the integral clearing time (CCT) of a power network. The indispensable clearing time is carried out through increasing the time fault interval until the gadget loses stability. Increasing the CCT can be contribute to reliability of the safety gadget, decrease the protection machine ranking and cost. In order to attain most enhancement of machine stability via optimizing location, sizing and control modes of SVC and TCSC. Models and methodology for putting and designing shunt FACT’s units SVC (injected reactive strength Q) and series FACT’s devices TCSC (chose capacitive region) are examined in a 6-bus system. Performance factors are described to show validation of SVC and TCSC on extraordinary conditions. It is proven that the SVC is better than TCSC. </span></p>

scholarly journals PENGGUNAAN STRATEGI PEMBELAJARAN AKTIF EVERYONE IS A TEACHER HERE (ETH) TERHADAP KEMAMPUAN PEMAHAMAN KONSEP MATEMATIKA SISWA KELAS VII

2018 ◽  
Vol 4 (1) ◽  
pp. 95-100
Author(s):  
Sri Yunita Ningsih ◽  
Gustimalasari Gustimalasari
Keyword(s):  
Active Learning ◽  
Learning Strategy ◽  
Control Group ◽  
Control Group Design ◽  
Concept Understanding ◽  
Group Design ◽  
Quasi Experimental ◽  
Active Learning Strategy ◽  
And Control ◽  
Better Than

Abstract. This research has been made to know skill of student’s concept by using active learning strategy everyone is teacher here (ETH). Beside that this study aims to measure student’s concept understanding with statistical test between Experimental Class (Active Learning Strategy Everyone Is Teacher Here) and control class (Conventional Learning ). The population was seventh grade of SMPN 3 Lirik consist 94 students in three classes. Sample was took randomly, experiment class ( VII.2 ) and control class ( VII.I ) This research was experiment, the form of this research was Quasi Experimental Design with randomized subject posttest only control group design. based on statistic data processing has been retrieved - t hitung -3,159 smaller than - t table was -2,000 and based on t test has been retrieved -thitung < -t table so Ho rejected and Ha received. So that the writer conclude that skill of math student’s concept understanding by using active learning Strategy Everyone Is Teacher Here (ETH) is better than conventional concept understanding.Keywords: Everyone Is A Teacher Here, Concept Understanding

scholarly journals THE IMPACT OF TRANSLANGUAGING APPROACH ON TEACHING ARABIC READING IN A MULTILINGUAL CLASSROOM

2018 ◽  
Vol 1 (1) ◽  
Author(s):  
Saidna Zulfiqar Bin-Tahir ◽  
Ummu Saidah ◽  
Nuril Mufidah ◽  
Riki Bugis
Keyword(s):  
Reading Comprehension ◽  
Sampling Technique ◽  
Simple Random Sampling ◽  
Control Group ◽  
Education Department ◽  
Written Test ◽  
Multilingual Classroom ◽  
And Control ◽  
The Impact ◽  
Better Than

 The study aimed at measuring the effect of translanguaging approach in teaching Arabic reading comprehension to the second semester students of Indonesian Education Department, Universitas Iqra Buru. 64 students involved as the participants through simple random sampling technique. 32 students participated in each of the experimental and control group. The researchers used reading test of written test to obtain information about the students’ achievemnt in reading on the use of translanguaging approach and it was distributed to the respondents after the last treatment given. To find out the mean score, standard deviation and the t-test value between the pretest and the posttest the researchers used the SPSS 17 program. The researchers found that the use of translanguaging approach in learning Arabic reading comprehension improves the students’ ability of Arabic reading comprehension is better than the conventional method.

scholarly journals The Influence of Teaching Vocabulary by Using Picture

2016 ◽  
Vol 1 (2) ◽  
pp. 159
Author(s):  
Hanik Nuzulimah
Keyword(s):  
Control Group ◽  
First Year ◽  
First Year Students ◽  
Significant Difference ◽  
Post Test ◽  
The Subject ◽  
And Control ◽  
Data Analysis Result ◽  
Experimental Group ◽  
Better Than

This paper attempts to explore whether there is significant difference of achievement in vocabulary between students taught by using pictures and those are not. The subject of this study is the first year students of SLTP Muhammadiyah Simo Susukan, Semarang where the sample contains 50 students that is divided into experimental group (with treatment) and control group (without treatment). The data is gathered from participants’ score obtained from pre test and post test. Using t test as technique of data analysis, result shows that students taught by using pictures perform better than those are not. It means that there is significant difference between the two groups. Keywords: Vocabulary Teaching; Picture

scholarly journals The Effect of Using Word Family Game on The Vocabulary Mastery of The Fifth Grade Students at SD Negeri 1 Astina in Academic Years of 2017/2018

2017 ◽  
Vol 1 (3) ◽  
pp. 122
Author(s):  
Ni Komang Amelia Kartadi
Keyword(s):  
Fifth Grade ◽  
Control Group ◽  
Control Group Design ◽  
Fifth Grade Students ◽  
Conventional Teaching ◽  
Post Test ◽  
The Mean ◽  
And Control ◽  
Experimental Group ◽  
Better Than

This study aimed at investigating of the effect of using word family game committed by the fifth grade student in SD Negeri 1 Astina in mastering the English vocabulary. This study was True-Experimental with post-test only control group design. The population was 59 students of the fifth grade and the sample was selected by using cluster random sampling. The sample of this research study was 22 students in 5A as an Experimental Group while 22 students in 5B as a Control Group. The experimental group was taught by using Word Family Game and control group was taught without using Word Family Game. The data was analyzed descriptively and inferentially through SPSS 16.0 Program. Descriptively, the students in experimental group were achieved better than the students in control group. It was proven by the result of the mean score of the experimental group was 90.45, while the mean score of control group was 83.18. The result of the t-test also showed that the score of the (tobs) was 3.393 which the score of (tcv) was 1.682 which based on the degree of freedom was 42. It showed that the (tobs) > (tcv), where: 3.393 > 1.682. It could be concluded that the word family game had a significant effect on the students’ vocabulary mastery rather than using conventional teaching. 

scholarly journals THE EFFECTIVENESS OF USING PECHA KUCHA TECHNIQUE TO PROMOTE STUDENTS’ SPEAKING SKILL

2021 ◽  
Vol 4 (1) ◽  
pp. 37
Author(s):  
Eva Faliyanti ◽  
Devi May Ratih
Keyword(s):  
Average Score ◽  
Control Group ◽  
English Department ◽  
Oral Test ◽  
Post Test ◽  
Speaking Skill ◽  
And Control ◽  
Academic Year ◽  
Experimental Group ◽  
Better Than

The aimed of this research is to test the effectiveness of using Pecha Kucha Technique in students’ speaking performance at fourth semester of English Department in Muhammadiyah University of Metro. Pecha Kucha is a presentation form of 20 pictures for 20 seconds and it is also called 20x20 presentations.The entire presentation always lasts for exactly 6 minutes and 40 seconds. The research method used in this research is an experimental research. The subjects of this research are the students at fourth semester of English Department in Muhammadiyah University of Metro academic year 2020. There are 21 students of control group and 21 students of experimental group. The research instrument used to collect the data in this research is an oral test. From the two classes, the experimental and control group, the measurement shows that increasing line of the speaking ability of the experimental group is higher than the control group. The result of pre-test score shows that the average score of the experimental group and the control group are 52.38 and 56.19. From the score of both groups, the result shows that the control group is better than experimental group. Then, the result of the post test of the experimental group is higher than control group; the average scores are 70,71 for experimental group and 62.38 for control group. It can be concluded that there is significant influence of using Pecha Kucha Technique in students’ speaking skill.

scholarly journals Automated Measurement and Control of Germination Paper Water Content

Sensors ◽  
2019 ◽  
Vol 19 (10) ◽  
pp. 2232
Author(s):  
Lina Owino ◽  
Marvin Hilkens ◽  
Friederike Kögler ◽  
Dirk Söffker
Keyword(s):  
Water Content ◽  
Water Deficit ◽  
Plant Development ◽  
Growth Substrate ◽  
Irrigation Amount ◽  
Control Approach ◽  
Predictive Controller ◽  
And Control ◽  
Improved Accuracy ◽  
Measurement And Control

Germination paper (GP) is used as a growth substrate in plant development studies. Current studies bear two limitations: (1) The actual GP water content and variations in GP water content are neglected. (2) Existing irrigation methods either maintain the GP water content at fully sufficient or at a constant deficit. Variation of the intensity of water deficit over time for plants grown on GP is not directly achievable using these methods. In this contribution, a new measurement and control approach was presented. As a first step, a more precise measurement of water content was realized by employing the discharging process of capacitors to determine the electrical resistance of GP, which is related to the water content. A Kalman filter using an evapotranspiration model in combination with experimental data was used to refine the measurements, serving as the input for a model predictive controller (MPC). The MPC was used to improve the dynamics of the irrigation amount to more precisely achieve the required water content for regulated water uptake in plant studies. This is important in studies involving deficit irrigation. The novel method described was capable of increasing the accuracy of GP water content control. As a first step, the measurement system achieved an improved accuracy of 0.22 g/g. The application of a MPC for water content control based on the improved measurement results in an overall control accuracy was 0.09 g/g. This method offers a new approach, allowing the use of GP for studies with varying water content. This addressed the limitations of existing plant growth studies and allowed the prospection of dependencies between dynamic water deficit and plant development using GP as a growth substrate for research studies.

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