bluuebunny/crossref_metadata_2025 huggingface dataset:
Penggunaan Metode Student Team Achievement Division untuk Meningkatkan Motivasi Belajar Siswa pada Konsep Menghitung Luas Segitiga Kelas IV SD
Authors: Rodinah Rodinah
Published: August 2020

The purpose of this study was (1) to analyze the impact of using the Student Team Achievement Division (STAD) method to increase student motivation about the concept of calculating the area of a triangle in class IV SD Negeri 1 Dermaji, Lumbir District, Banyumas Regency. (2) analyzing the impact of using the Student Team Achievement Division (STAD) method can improve student learning outcomes about the concept of calculating the area of a triangle in class IV SD Negeri 1 Dermaji Banyumas District Banyumas Regency. The CAR procedure consists of four steps of research, namely planning, implementation, observation and reflection in its implementation of two cycles. The results of this study can be concluded as follows: (1) the use of the STAD method in mathematics learning about calculating the area of a triangle can increase learning motivation of fourth grade students of SD Negeri 1 Dermaji Banyumas District Banyumas Regency with an increase from 10 students to 22 students or 50.00%. (2) With the use of visual aids can improve student learning outcomes in class IV SD Negeri 1 Dermajid with an average from the beginning of learning to the second cycle that is 49.79 to 75.63 increased 86.67 and mastery learning from 8 students to 18 students later rose to 23 students from 24 students overall. So in the conclusion of this study are (1) The use of the STAD method can increase student motivation in class IV SD Negeri 1 Dermaji Banyumas District Banyumas Regency; (2) The use of the STAD method is proven to be able to improve student learning outcomes in class IV SD Negeri 1 Dermaji, Banyumas District, Banyumas Regency.
Meningkatkan Hasil Belajar PKn tentang Lembaga Pemerintahan Desa
Authors: Riswanto Riswanto
Published: August 2020

One of the goals of national education is to educate the life of the nation, but efforts to realize the goals of education are not easy. In fact, there are many obstacles faced by both students and teachers. The level of mastery of learning material in SD Lumbir State Lumbir UPK is not in accordance with the criteria of success. Therefore teachers need to make improvements to learning through Classroom Action Research (CAR). Classroom Action Research begins with self-reflection, discussing with colleagues (collaborating), knowing the problems faced and finding alternative solutions that consist of planning, implementing, observing and reflecting in each cycle. In this study the teacher uses the field trip method which will be divided into three cycles, each cycle consisting of two meetings. The purpose of this study is to improve student learning outcomes.After conducting research through 3 cycles with Minimum Completion Criteria (KKM) 7.5, the results obtained increased each cycle from the initial study to only 3 children who completed learning or 18%, the first cycle of 6 children who completed learning or 37%, cycle II as many as 10 children completed study or 62% and cycle III 14 students completed study or 87% of the total grade IV students were 17 students. So, the use of field trip methods has succeeded in increasing student activity and learning outcomes. After carrying out this research teachers should be able to use appropriate methods and can improve student learning outcomes so that learning is successful and effective.
Upaya Peningkatan Hasil Belajar IPA Melalui Metode Demonstrasi
Authors: Lestarai Inti
Published: August 2020

The purpose of this Classroom Action Research is to improve student learning outcomes in grade 1 SD Negeri 2 Karanggayam Kidul Kec Purwojati, through the application of demonstration methods (experiments) so that natural science learning about material objects that can be changed in shape is achieved. The research design is carried out through two cycles, starting from planning, implementation, action, observation, reflection and proceed with planning the next cycle. The results of this class action improvement is the average value of student learning outcomes have increased from the initial condition of 60.1 can increase to 71.5 in cycle I. While in cycle II to be 75.6. In terms of completeness in the initial study 16 students completed, cycle I 26 students completed and cycle II 33 students completed from 34 students with completeness values of 70 and above. Based on the findings of the results of this study it can be concluded that the application of the demonstration method (experiment) in natural science learning about material objects which can be changed in shape can improve student learning outcomes in grade 1 SD Negeri 1 Karangtalun Kidul
Upaya Meningkatkan Hasil Belajar Struktur Tubuh Manusia melalui Model Snowball Throwing Bagi Siswa SD
Authors: Hartini Hartini
Published: August 2020

This research is motivated by the low learning outcomes of natural science subjects about the structure of the human body and its functions for fourth grade students of SD Negeri 2 Jatilawangsang odd semester 2014/2015 academic year. The purpose of this study is to improve student learning outcomes. The research was carried out through two cycles, namely through the first cycle and second cycle using the Snowball Throwing learning model. In the initial study the average value was 56.85, the first cycle being 72.85. Then in the second cycle increased optimally to 82.28. The percentage of completeness of the initial study was 25.71% then the first cycle became 77.15%. Then in the second cycle increased to 94.28%. The percentage of incomplete in the pre cycle 74.29% then the first cycle decreased to 22.85%. Then in the second cycle to 5.72%. Conclusion of the application of the Snowball Throwing model Improved Learning Outcomes of the Human Body Structure and Its Functions for Grade IV Students of SD Negeri 2 Sudagaran, Banyumas Regency 2014/2015 Academic Year.
Penggunaan Model Examples Non Examples untuk Meningkatkan Hasil Belajar pada Mata Pelajaran IPS Siswa SD
Authors: Karno Karno
Published: August 2020

This research was based on the low learning outcomes of Social Studies students in grade IV SD Negeri 2 Adisaran odd semester 2014/2015 academic year. The research was carried out in stages, namely through cycle I and cycle II using the examples non examples model. From this research, it can be seen the results of social studies learning about the components of the map and how to read the maps obtained in pre-cycle learning, with the lowest value of 40, the highest value of 90, the average value of the class 59.52 with mastery learning 19.05%. Learning outcomes in the first cycle obtained the lowest value of 50, the highest value of 100 and an average grade of 76.66 with a mastery of learning 66.66%. The learning outcomes in the second cycle are the lowest value of 70, the highest value of 100, the average grade of 89.52 with 100% completeness of learning. The conclusion by using the examples non examples model can improve social studies learning outcomes in class IV students especially about the map components and how to read maps. Researchers hope that if there are teachers who use this learning model in order to minimize existing weaknesses.
Disparitas Pendapatan dan Pengembangan Ekonomi Lokal di Kota Surabaya
Authors: Mauliddah Nurullaili
Published: August 2020

ABSTRACT

The purpose of this study is to explain and find out whether local economic development in the city of Surabaya has been going well and have an impact on decreasing disparity between sub-districts in Surabaya. The research method used is quantitative descriptive with SWOT analysis and Williamson Index (IW). The instrument used in obtaining primary data was a questionnaire distributed to MSMEs under the guidance of the Surabaya City Government by sampling using Proportional Stratified Random Sampling. The results of the study illustrate the potential for the local economy to have been developed and facilitated by the government in the form of training, access to capital, facilitation of business legality, etc. However, the disparity between sub-districts is still relatively high with the calculation of the average Williamson Index of 0.5 in the period 2014-2018. Therefore, government intervention is still very much needed in developing the local economic potential of Surabaya City

ABSTRAK

Tujuan dari penelitian ini untuk menjelaskan dan mengetahui apakah pengembangan ekonomi lokal di Kota Surabaya telah berjalan dengan baik dan memberikan dampak terhadap penurunan disparitas antar wilayah kecamatan di Kota Surabaya. metode penelitian yang digunakan adalah deskriptif kuantitatif dengan alat analisis SWOT dan perhitungan Indeks Williamson (IW). Instrumen yang digunakan dalam menggali data primer adalah kuesioner yang disebar kepada pelaku UMKM binaan Pemerintah Kota Surabaya dengan pengambilan sampel menggunakan tehnik Proportional Stratified Random Sampling. Hasil penelitian menunjukkan potensi ekonomi lokal telah dikembangkan dan difaslitasi oleh pemerintah baik dalam bentuk pelatihan, akses modal, fasilitasi legalitas usaha dsb. Namun demikian, disparitas antar wilayah kecamatan masih tergolong tinggi dengan hasil perhitungan Indeks Williamson rata-rata dalam kurun waktu tahun 2014-2018 sebesar 0,5. Oleh karena itu, intervensi pemerintah masih sangat dibutuhkan dalam pengembangan potensi ekonomi lokal Kota Surabaya.
Pengaruh Reward (Penghargaan) Terhadap Kinerja Dengan Komitmen Organisasi Sebagai Variabel Moderasi PT. Dinamika Indonusa Prima Medan
Authors: Martin Martin
Published: August 2020

ABSTRACT

The purpose of this study was to determine the effect of reward on performance with organizational commitment as a moderating variable at PT. The dynamics of Indonusa Prima Medan. The population in kar research is the employees of PT. The dynamics of Indonusa Prima Medan, amounting to 72 respondents while the determination technique with saturated samples. So that the sample in this study amounted to 72 respondents. The path analysis results show that reward (reward) has a positive effect on employee performance through organizational commitment. While partially shows that the reward (award) has a positive and significant effect on performance and organizational commitment variables also have a positive and significant effect on performance. PT. The dynamics of Indonusa Prima Medan have contributed to a strong level. Then the coefficient of determination (R2) 0.708 (70.8%). So it can be said that 70.8% of the dependent variable variations namely rewards and organizational commitment to the model can explain the employee performance variables at PT. The dynamics of Indonusa Perkasa Medan while the remaining 29.2% is influenced by other variables outside the model.

ABSTRAK

Tujuan dalam penelitian ini untuk mengetahui pengaruh reward (penghargaan)terhadap kinerja dengan komitmen organisasi sebagai variabel moderasi pada PT. Dinamika Indonusa Prima Medan. Populasi dalam penelitian kar yaitu karyawan PT. Dinamika Indonusa Prima Medanyang berjumlah 72 responden sedangkan teknik penentuan dengan sampel jenuh. Sehingga sampel dalam peneltian ini berjumlah 72 responden. Hasil analisis jalur menunjukkan bahwa reward (pengahargaan) berpengaruh positif terhadap kinerja karyawan melalui komitmen organisasi. Sedangkan secara parsial menunjukkan bahwa reward (penghargaan) berpengaruh positif dan signifikan terhadap kinerjaserta variabel komitmen organisasi juga berpengaruh positif dan signifikan terhadap kinerjaHasil koefisien determinasi dengan nilai regresi korelasi sebesar 0,846 artinya secara bersama-sama reward (penghargaan) dan persepsi konsumen terhadap kinerja pada PT. Dinamika Indonusa Prima Medan memiliki kontribusi pada taraf yang kuat.  Kemudian koefisien determinasi (R2) 0,708 (70,8%). Sehingga dapat dikatakan bahwa 70,8% variasi variabel terikat yaitu Reward dan komitmen organisasi pada model dapat menjelaskan variabel kinerja karyawan pada PT. Dinamika Indonusa Perkasa Medan sedangkan sisanya sebesar 29,2% dipengaruhi oleh variabel lain di luar model.
Pengaruh Kompensasi dan Disiplin Kerja Terhadap Kinerja Dosen Melalui Kepuasan Kerja
Authors: Nirmalasari Nirmalasari , Amelia Ratih
Published: August 2020

ABSTRACT

The purpose of this study is to determine the effect of compensation on job satisfaction, to determine the effect of work discipline on job satisfaction, to determine the effect of compensation and work discipline on job satisfaction, to determine the effect of compensation and work discipline on lecturer performance through job satisfaction. This type of research is causal (cause and effect. The population and sample in this study were permanent lecturers of LP3M Superior Polytechnic as many as 52 people. Furthermore, the sampling technique used quota sampling. Then the data collection technique used questionnaires with a Likert scale. The results showed that partially and simultaneously compensation and work discipline had a positive and significant effect on job satisfaction of lecturers. Furthermore, for the indirect effect shows that the compensation and work discipline variables have a positive and significant effect on the performance of lecturers through job satisfaction. The implication in this study shows that the compensation given is expected based on the performance of lecturers in the three-tridarma of higher education. Furthermore, work discipline shows that reward programs for outstanding lecturers are able to increase job satisfaction and have an impact on lecturer performance

 ABSTRAK

Tujuan dalam penelitian ini yaitu untuk mengetahui pengaruh kompenasi terhadap kepuasan kerja, untuk mengetahui pengaruh disiplin kerja terhadap kepuasan kerja,  untuk mengetahui pengaruh kompensasi dan disiplin kerja terhadap kepuasan kerja, untuk mengetahui pengaruh kompensasi dan disiplin kerja terhadap kinerja dosen melalui kepuasan kerja. Jenis penelitian ini yaitu kausal (sebab-akibat. Populasi dan sampel dalam penelitian ini merupakan dosen tetap Politeknik Unggul LP3M sebanyak 52 orang. Selanjutnya teknik penarik sampel menggunakan kuota sampling. Kemudian teknik pengumpulan data menggunkan kusioner dengan skala likert. Hasil penelitian menununjukkan bahwa secara parsial dan simultan kompensasi dan disiplin kerja berpengaruh positif dan signifikan terhadap kepuasan kerja dosen. Selanjutnya untuk pengaruh tidak langsung menununjukkan bahwa variabel kompensasi dan disiplin kerja berpengaruh positif dan signifikan terhadap kinerja dosen melalui kepuasan kerja. Implikasi dalam penelitian ini menunjukkan bahwa kompenasi yang diberikan diharapkan berdasarkan kinerja dosen dalan tridarma perguruan tinggi. Selanjutnya disiplin kerja menunjukkan bahwa program reward kepda dosen yang berprestasi mampu meningkatkan kepuasan kerja serta berdampak pada kinerja dosen.
Kontribusi Dimensi Gaya Kepemimpinan Islami Pada Kinerja Guru
Authors: Syam Edi Bahtiar , Pascawati Poppy Nahdia Syahrani , Sjahruddin Herman
Published: August 2020

ABSTRACT

The practice of Islamic leadership in education becomes very important to be analyzed in creating quality education through the performance produced by teachers. This research was conducted at the State Aliyah Madrasah in Makassar City using 81 teachers as population as well as samples. The results of the multiple regression analysis provide evidence that the Islamic leadership that has been shown by the madrasa head is in very good condition, that the overall dimensions used, namely the Islamic Leadership which are honest, trustworthy, smart, fair, wise and open have been able to make a real contribution in improving teacher performance. Among the overall dimensions of Islamic leadership analyzed in this study, there is one dimension that tends to have been done well by the madrasa head, namely the sincere dimension proved unable to provide a real contribution in efforts to improve teacher performance.

ABSTRAK

Praktik kepemimpinan Islami dalam dunia pendidikan menjadi sangat penting untuk dianalisis dalam menciptakan pendidikan yang berkualitas melalui kinerja yang dihasilkan guru. Penelitian ini dilakukan pada Madrasah Aliyah Negeri di Kota Makassar dengan menggunakan 81 guru sebagai populasi sekaligus sebagai sampel. Hasil analisis regresi berganda memberikan bukti bahwa kepemimpinan islami yang telah diperlihatkan kepala madrasah sudah berada dalam kondisi yang sangat baik, bahwa keseluruhan dimensi yang digunakan, yaitu Kepemimpinan Islami dimensi jujur, amanah, cerdas, adil, bijaksana dan bersikap terbuka telah mampu memberikan kontribusi yang nyata dalam meningkatkan kinerja guru. Diantara keseluruhan dimensi kepeminan islami yang dianalisis dalam penelitian ini terdapat satu dimensi yang cenderung telah dilakukan dengan baik oleh kepala madrasah, yaitu  dimensi ikhlas terbukti tidak mampu memberikan kontribusi yang nyata dalam upaya peningkatan kinerja guru.
Pengaruh Pengelolaan Keuangan Daerah dan Sistem Akuntansi Keuangan Daerah Terhadap Kinerja Pemerintahan Daerah (Studi kasus pada BPKAD di Kota Padang)
Authors: Sartika Dewi , Monita Deby Clara , Ilyas Andre
Published: August 2020

ABSTRACT

This study aims to determine the Effect of Regional Financial Management and Regional Financial Accounting Systems on Regional Government Performance. The researcher examined several variables that allegedly influenced the performance of regional government namely financial management and financial accounting systems.  This research uses causal research, with qualitative and quantitative methods. The unit of analysis in this study is the Regional Financial and Asset Management Agency (BPKAD) of the City of Padang. The population in this study were 83 employees using the survey method. While for the technique of data collection is done by using questionnaires, interviews, documents and literature. To facilitate problem solving, this study was conducted using multiple linear regression models with the help of IBM SPSS Statistics 21. The results of this study are that regional financial management does not have a significant effect on the performance of regional government with a significant level of 0.169, while the regional financial accounting system has a significant influence on the performance of local governments with a significant level of 0.000. Regional financial management and regional financial accounting systems have a significant influence on local government performance of 25.6% while the remainder is explained by other factors.

ABSTRAK

Penelitian ini bertujuan untuk mengetahui Pengaruh Pengelolaan Keuangan Daerah dan Sistem Akuntansi Keuangan Daerah Terhadap Kinerja Pemerintahan Daerah.Peneliti menguji beberapa variabel yang diduga mempengaruhi kinerja pemerintahan daerah yaitu pengelolaan keuangan dan sistem akuntansi keuangan. Penelitian ini menggunakan jenis penelitian kausual, dengan metode kualitatif dan kuantitatif. Unit analisis dalam penelitian ini adalah Badan Pengelolaan Keuangan dan Aset Daerah (BPKAD) Kota Padang. Populasi pada penelitian ini sebanyak 83 pegawai dengan menggunakan metodesurvey. Sedangkan untuk teknik pengumpulan data dilakukan dengan menggunakan kuesioner, wawancara, dokumen dan kepustakaan. Untuk memudahkan pemecahan masalah, penelitian ini dilakukan menggunakan model regresi linier berganda dengan bantuan IBM SPSS Statistics 21. Hasil penelitian ini adalah pengelolaan keuangan daerah tidak mempunyai pengaruh signifikan terhadap kinerja pemerintahan daerah dengan taraf signifikan 0.169, sedangkan sistem akuntansi keuangan daerah mempunyai pengaruh signifikan terhadap kinerja pemerintah daerah dengan taraf signifikan 0.000. Pengelolaan keuangan daerah dan sistem akuntansi keuangan daerah mempunyai pengaruh signifikan terhadap kinerja pemertintah daerah sebesar 25.6% sedangkan sisanya dijelaskan oleh faktor-faktor yang lain.
Analisis Faktor-Faktor yang Mempengaruhi Auditor dalam Memberikan Opini Audit atas Laporan Keuangan Pemerintah Daerah (LKPD) Provinsi Sumatera Barat
Authors: Murniati Murniati , Natalia Widi
Published: August 2020

ABSTRAC

This research was conducted to determine the effect of independence, audit expertise, the scope of the audit, audit audit, and interim examination of the consideration of giving audit opinion. In this study, researchers examined the consideration of providing audit opinion at the Office of the Republic of Indonesia Supreme Audit Agency (BPK) of West Sumatra Province by using independent variables, namely independence, audit expertise, audit scope, audit judgment, and interim examination. The population in this study are all auditors who work at the Representative Office of the Supreme Audit Board (BPK) of Republic of Indonesia in West Sumatra Province. The primary data collection method used was a questionnaire method distributed to respondents, the sampling technique was purposive sampling with a sample size of 22 respondents. The results of testing the hypothesis in this study indicate that the variables of independence, audit expertise, audit judgment and interim examination have a positive and significant effect on giving audit opinion, while audit scope variable has no effect but has a negative direction. Simultaneously the variables of independence, audit expertise, audit judgment and interim examination have a positive and significant effect on giving audit opinion.

 ABSTRAK

Penelitian ini dilakukan untuk mengetahui pengaruh independensi, keahlian audit, lingkup audit, audit judgemet, dan pemeriksaan interim terhadap pertimbangan pemberian opini audit. Dalam penelitian ini, peneliti mengkaji pertimbangan pemberian opini audit pada Kantor Badan Pemeriksa Keuangan (BPK) RI Perwakilan Provinsi Sumatera Barat dengan menggunakan variabel independen, yaitu independensi, keahlian audit, lingkup audit, audit judgement, dan pemeriksaan interim. Populasi dalam penelitian ini adalah seluruh auditor yang bekerja pada Kantor Perwakilan Badan Pemeriksa Keuangan (BPK) RI Perwakilan Provinsi Sumatera Barat. Metode pengambilan data primer yang digunakan adalah metode kuesioner yang dibagikan kepada responden, teknik pengambilan sampel yaitu dengan purposive sampling dengan jumlah sampel sebanyak 22 responden. Teknik analisis data yang digunakan dalam penelitian ini adalah teknik analisis regresi linier berganda. Hasil dari pengujian hipotesis dalam penelitian ini menunjukkan bahwa variabel independensi, keahlian audit, audit judgement dan pemeriksaan interim berpengaruh positif dan signifikan terhadap pemberian opini audit, sedangkan variabel lingkup audit tidak berpengaruh namun beraarah negatif. Secara simultan variabel independensi, keahlian audit, audit judgement dan pemeriksaan interim berpengaruh positif dan signifikan terhadap pemberian opini audit.
Pengaruh Celebrity Endorser Terhadap Keputusan Pembelian (Studi Pada Produk Erigo Melalui Instagram)
Authors: Ningsih Tessa Surya , Putri Siska Lusia
Published: August 2020

ABSTRACT

The research is in the form of quantitative research using primary data obtained from the distribution of questionnaires. The study population included Instagram users who joined the @erigoapparel Instagram. Data obtained from collection throught onlilne distribution questionnaires to customers who have purchased Erigo products through Instagram and know Arief Muhammad as Erigo’s brand endroser. The population data in this study were 100 respondents. The sampling technique used in purposive sampling. Methods analysis of the data used is multiple linear regression. The result showed that partially the trustworthiness, variabel had no significant effect on purchasing decisions, expertise did not have a significant effect on purchasing decisions, attractive had a significant effect on purchasing decision, respect did not significant influence purchasing decisions and similairty had a significant effect on purchasing decisions. Product Erigo the value of Adjust R square. Product Erigo indicators by 0.539.

 ABSTRAK

Penelitan ini berbentuk kuantitatif dengan menggunakan data primer yang diperoleh dari penyebaran kuisioner. Populasi penelitian ini meliputi pengguna instagram yang mengikuti akun instagram @erigoapparel dan konsumen yang pernah membeli produk Erigo. Data yang diperoleh dari pengumpulan melalui kuisioner online ke pelanggan yang telah membeli produk Erigo melalui Instagram dan mengenal Arief Muhammad sebagai endorser merek dari Erigo. Data populasi dari penelitian ini sebanyak 100 responden. Teknik pengambilan sampel yang digunakan adalah Purposive Sampling. Metode analisis data yang digunakan adalah regresi linier berganda. Hasil penelitian ini menunjukkan bahwa secara parsial variabel trustworthiness, tidak berpengaruh secara signifikan terhadap keputusan pembelian, expertise tidak berpengaruh signifikan terhadap keputusan pembelian, attractiveness berpengaruh signifikan terhadap keputusan pembelian, respect tidak berpengaruh signikan terhadap keputusan pembelian dan similiarity berpengaruh signifikan terhadap keputusan pembelian. Produk Erigo ini memiliki nilai Adjust R square sebesar 0.539.
Pengaruh Struktur Modal Terhadap Laba Pada PT. Telekomunikasi Indonesia (Persero) TBK
Authors: Wijaya Jaka , Pratiwi Aliah
Published: August 2020

ABSTRACT

 This study aims to determine the effect of capital structure on earnings at PT. Telekomunikasi Indonesia (Persero) Tbk. This research uses associative research methods. The population used in this study is the entire consolidated financial statements of PT. Telekomunikasi Indonesia Tbk for 13 years from 2006 with the sampling technique used is purposive sampling, the sample used is 6 years from 2013-2018. The data analysis technique used is simple linear regression with SPSS 16 for windows. From the research conducted, the results show that the capital structure has no effect and is not significant to profit. This can be seen from the results of the t test conducted tcount obtained 1.661  0.05, it can be concluded that the Capital Structure variable has no effect and is not significant on Profit.

ABSTRAK

Penelitian ini bertujuan  untuk mengetahui pengaruh struktur modal terhadap laba pada PT. Telekomunikasi Indonesia (Persero) Tbk. Penelitian ini menggunakan metode penelitian asosiatif. Populasi yang digunakan dalam penelitian ini yaitu seluruh laporan keuangan konsolidasi PT. Telekomunikasi Indonesia Tbk selama 13 tahun dari tahun 2006dengan Teknik sampling yang digunakanyaitu purposive sampling, sampel yang digunakan yaitu 6 tahun dari tahun 2013-2018. Teknik analisis data yang digunakan adalah regresi linier sederhana dengan program SPSS 16 for windows. Dari penelitian yang yang dilakukan diperoleh hasil yaitu Struktur Modal tidak berpengaruh dan tidak signifikan terhadap Laba.  Hal ini terlihat dari hasil uji t yang dilakukan diperoleh nilai thitung 1,661 < ttabel 2,776, dan nilai sig 0,172 > 0,05, maka dapat disimpulkan bahwa variabel Struktur Modal tidak berpengaruh dan tidak signifikan terhadap Laba.
Force Density Relation and Lightweight Modeling of Single Layer Tensegrity Structures
Authors: Yang Haoyu , Liu Ruiwei , Luo Ani , Liu Heping , Li Chuanyang
Published: August 2020

A mathematical model is established using the space coordinates of nodes and vector matrix of components to study the construction method and lightweight nature of single-layer tensegrity structures on the basis of their geometric parameters. Connection matrix and configuration of the single-layer tensegrity structures are built using MATLAB software. The force balance equations of nodes of a three-bar tensegrity structure are established by introducing the force-density method, and the force-density relationship amongst the components is analysed. Thus, the configuration principle of single-layer tensegrity structure is verified. The force-density relationship between the components in the single-layer tensegrity structure is obtained. The change rule of the force-density relationship in different single-layer tensegrity structures is also analysed. Notably, p-1 stable configurations are present in the p-bar tensegrity structure. The force-density relationships of these p-1 configurations are in symmetrical distribution, that is, the j-th and (p-j)th configurations have the same force-density relationship. The lightweight nature of the structure is studied using the force-density relationship between the components, and the optimal structural parameter relationship is obtained when the structure has the lightest mass.
Development and Application of Computational Tool Using Local Surface Inclination Methods for Preliminary Analysis of Hypersonic Vehicles
Authors: Rolim Tiago Cavalcanti , Cintra Sheila Cristina , Pellegrini Marcela Marques da Cruz
Published: August 2020

This work presents a computational tool for preliminary analysis of hypersonic vehicles, based on local surface inclination methods: the HipeX. This program was developed for reading standard triangulation language (STL) geometry files and calculating pressure coefficient and temperature distributions over vehicle’s surface using the Newtonian, modified Newtonian or tangent-wedge methods. Validations were made with a cylinder and a sphere, where only the Newtonian method was applied, and with experimental data from Apollo capsule at Mach 10, where the Newtonian and the modified Newtonian methods were applied. These validations presented the code capability to read geometries as well as to estimate aerodynamic force coefficients. A preliminary application was to predict the aerodynamic force coefficients of a generic hypersonic vehicle over constant dynamic pressure trajectories of 23,940, 60,000 and 95,760 N/m2 with zero angle of attack. With a fixed dynamic pressure of 60,000 N/m2, this vehicle was tested over several Mach numbers and with angle of attack variation from -10 to 10 deg. Zero angle of attack investigation showed minor changes on the force coefficients with altitude, while the variation of angle of attack produced more pronounced variations on these parameters. Maximum flow temperatures over vehicle’s surface were estimated ranging from 850 to 5,315 K.
Development of an Autonomous Redundant Attitude Determination System for Cubesats
Authors: Duarte Ricardo O. , Vale Samuel R. C. , Martins-Filho Luiz S. , Torres Fernando E.
Published: August 2020

This work deals with the problem of the design of an autonomous redundant system for the attitude determination of nanosatellites. The system consists of a circuit board equipped with three microcontrollers, a magnetic field sensor in three axes, and complementary commercial-of-the-shelf (COTS) components and connectors to provide data signal exchange the vehicle on-board computer. The main goal of this system, named SDATF (of the acronym in Portuguese Sistema de Determinação de Atitude com Tolerância a Falhas), is to provide autonomously the vehicle attitude from the information collected from the onboard computer (OBC) and the magnetometer. The adopted attitude determination algorithm is based on the well-known QUEST method, and the goal of this system is to get accurate attitude computations to low-orbit CubeSat satellites using COTS electronic components, and to provide highly reliable data and high availability levels using fault tolerance tools to avoid the harmful consequences of spatial radiation and its faults known as single event upsets (SEU). The article presents the general design of the fault-tolerant systems and experimental tests using bit flip injection methodology.
The Aircraft Choice Based on the Aircraft Take-Off Runway Length Requirement
Authors: Narcizo Rodolfo Romboli , Alves Cláudio Jorge , Caetano Mauro
Published: August 2020

The choice of fleet by a given airline must consider different elements associated with both the aircraft and the airports to be operated, making it necessary a method to assist the aircraft choice process. This study assesses the take-off runway distance requirement of different aircraft models and compares the requirement to the take-off runway distance available at a group of airports. Using the Herfindahl-Hirschman index (HHI), the methodology consider the analysis of take-off runway length available on 80 Brazilian airports and compared it to the take-off distance required for 108 combinations of aircraft model, engine model and flight range, considering the take-off performance of the aircraft models with maximum payload weight. In total, 536 routes of four Brazilian airlines has been adopted to simulate the most profitable operating scenario. The result presents the take-off performance of different aircraft models and allows a performance comparison between them. In addition, this research investigates which is the most common flight range in Brazil, and what influence it exerts in the aircraft take-off performance, and contributes to a better match between the aircraft used and the airport operated in fleet optimization.
Outcome of Interventional Cardiac Catheterization in Infants Weighing Less Than 2500 Grams: A Comparative Study
Authors: Afifi Ahmed R S A , El-Baz Mohammed A. , El-Ghaiaty Hesham A. , Fattouh Aya M. , Hamza Hala S.
Published: August 2020

ABSTRACT

Objectives: A retrospective study to evaluate the outcome of interventional cardiac catheterization in infants weighing <2500 grams.

Background: The mortality of small weight infants undergoing heart surgery remains high, so cardiac catheterization has been utilized to improve the outcome.

Methods: The study included infants who underwent interventional cardiac catheterization within the first 60 days of life in New Children Cairo University Hospital, Cairo, Egypt from January 2015 to January 2018. The study group included infants < 2500 grams while the comparative group included infants ≥ 2500 grams. Adverse events were classified according to the mechanism and seriousness.

Results: The study group (37 patients) had a mean weight of 2.35 ±0.13 Kg, while the comparative group (164 patients) had a mean weight of 3.54 ±0.71 Kg. The procedures included balloon atrial septostomy, pulmonary balloon valvuloplasty, ductus arteriosus stenting and radiofrequency perforation of pulmonary atresia. The study group showed less success rates as compared with the comparative group (83.8% versus 93.9%, p = 0.04), and higher incidence of overall adverse events (48.6% versus 20.1 %, p<0.001) as well as catheterization-related mortality (29.7% versus 4.9%, P<0.001). In the study group, pulmonary balloon valvuloplasty showed the highest incidence of major adverse events while ductus arteriosus stenting had the highest incidence of mortality.

Conclusions: Compared to normal weight infants, interventional cardiac catheterization in small weight infants is associated with lower success and higher morbidity and mortality rates. Pulmonary balloon valvuloplasty and ductus arteriosus stenting have the highest morbidity and mortality, respectively.
DETECTION AND CLASSIFICATION OF BRIDGE CROSSING EVENTS WITH GROUND-BASED INTERFEROMETRIC RADAR DATA AND MACHINE LEARNING APPROACHES
Authors: Arnold M. , Keller S.
Published: August 2020

Abstract. In this paper, we investigate the potential of detecting and classifying vehicle crossings (events) on bridges with ground-based interferometric radar (GBR) data and machine learning (ML) approaches. The GBR data and image data recorded by a unmanned aerial vehicle, used as ground truth, have been measured during field campaigns at three bridges in Germany non-invasively. Since traffic load of the bridges has taken place during the measurement, we have been able to monitor the bridge dynamics in terms of a vertical displacement. We introduce a methodological approach with three steps including preprocessing of the GBR data, feature extraction and well-chosen ML models. The impact of the preprocessing approaches as well as of the selected features on the classification results is evaluated. In case of the distinction between event and no event, adaptive boosting with low-pass filtering achieves the best classification results. Regarding the distinction between different class types of vehicles, random forest performs best utilising low-pass filtered GBR data. Our results reveal the potential of the GBR data combined with the respective methodological approach to detect and to classify events under real-world conditions. In conclusion, the preliminary results of this paper provide a basis for further improvements such as advanced preprocessing of the GBR data to extracted additional features which then can be used as input for the ML models.
ROBUST REGISTRATION FOR OPTICAL AND SAR IMAGES BASED ON SPATIAL GEOMETRIC CONSTRAINT AND STRUCTURE FEATURES
Authors: Wang M. , Ye Y. , Sun M. , Tan X. , Li L.
Published: August 2020

Abstract. Automatic registration of optical and synthetic aperture radar (SAR) images is a challenging task due to significant geometric deformation and radiometric differences between two images. To address this issue, this paper proposes an automatic registration method for optical and SAR images based on spatial geometric constraint and structure features. Firstly, the Harris detector with a block strategy is used to extract evenly distributed feature points in the images. Subsequently, a local geometric correction is performed by using the Rational Function Model, which eliminates the rotation and scale differences between optical and SAR images. Secondly, orientated gradient information of images is used to construct a geometric structural feature descriptor. Then, the feature descriptor is transformed into the frequency domain, and the three-dimensional (3-D) phase correlation is used as the similarity metric to achieve correspondences by employing a template matching scheme. Finally, mismatches are eliminated based on spatial geometric constraint relationship between images, followed by a process of geometric correction to achieve the image registration. Experimental results with multiple high-resolution optical and SAR images show that the proposed method can achieve reliable registration accuracy, and outperforms the state of the art methods.
CALIBRATION OF THE SSOT MISSION USING A VICARIOUS APPROACH BASED ON OBSERVATIONS OVER THE ATACAMA DESERT AND THE GOBABEB RADCALNET STATION
Authors: Barrientos C. , Estay J. , Barra E. , Muñoz D.
Published: August 2020

Abstract. This work presents the results of the absolute radiometric calibration of the sensor on-board the “Sistema Satelital de Observación de la Tierra” (SSOT) using the vicarious approach based on in-situ measurements of surface reflectance and atmospheric retrievals. The SSOT mission, also known as FASat-Charlie, has been successfully operating for almost nine years ‒at the time of writing‒, exceeding its five-year nominal design life and providing multispectral and panchromatic imagery for different applications. The data acquired by SSOT has been used for emergency and disaster management and monitoring, cadastral mapping, urban planning, defense purposes, among other uses. In this paper, some results of the efforts conducting to the exploitation of the SSOT imagery for remote sensing quantitative applications are detailed. The results of the assessment of the radiometric calibration of the satellite sensor, performed in the Atacama Desert, Chile, using the data acquired and made available by the Gobabeb Station of Radiometric Calibration Network (RadCalNet), Namibia, are presented. Additionally, we describe the process for obtaining the absolute gains for the multispectral and panchromatic bands of the SSOT sensor by adapting the reflectance−based approach (Thome et al., 2001). The outputs achieved from the Atacama data collection have generated consistent results and average differences in the order of 3% with respect to the RadCalNet TOA reflectances. The presented results are an example of the benefits of having access to the RadCalNet data and how it increases the opportunity of conducting Cal/Val activities using endorsed calibration sites.
ATTITUDE RESTITUTION FOR MULTISPECTRAL EARTH OBSERVATION SATELLITE USING SPACE TRIANGULATION TECHNIQUE
Authors: Bernardini N. , Binet R. , Vidal B.
Published: August 2020

Abstract. Earth observation satellites are equipped with navigation components (star trackers, gyroscopes) which estimates the attitude of the satellite, corresponding to its orientation in the orbital reference frame. This equipment is essential for the localisation of the images which is done a posteriori and for the registration of the different images for a pushbroom sensor. This concerns both the registration of the spectral bands and the registration of multi-temporal series. However, the required accuracy is not always compatible with the performance of the attitude restitution. Moreover, some specific applications need more stringent geometric control even if requirements are met. With a multi-spectral pushbroom instrument, the same object on ground is seen as many times as number of spectral bands at different time instants: the attitude profile of the platform can be completely reconstructed from the results of the mapping of the different spectral bands. An attitude reconstruction method is proposed based on space triangulation inversion technique. The framework of this study is low-frequencies noise perturbations applied to Venμs satellite. Cubic splines are used for the attitude error profile, with 60 free parameters. Provided the physical model is representative, we show on two test cases that the convergence is very good. The band registration quality is used as a proxy to assess the performances. Residuals errors are less than 0.05 pixel for all tested band couples.
CALIBRATION AND VALIDATION OF CORONA KH-4B TO GENERATE HEIGHT MODELS AND ORTHOIMAGES
Authors: Jacobsen K.
Published: August 2020

Abstract. At 48 years of age CORONA-KH-4B images are important for actual urban planning in Bangladesh, where no old maps or aerial images exist, indicating locations of former water courses that are no longer visible, but causing problems for the stability of building ground.CORONA KH-4B images are available for very low cost or even free of charge. A forward and a backward-looking panoramic camera with a nadir angle of approximately 15° enabled a stereoscopic coverage. Taken from a height of 154km, an image covers approximately 220km × 14km up to 17km with a height to base relation of 1:1.85. The ground sampling distance (GSD) varies with the incidence angle from 1.77m in the centre of the image up to 2.18m in Y-direction and 2.69m in the X-direction at the ends of the images. These nice conditions of the old images are affected by geometric problems of the panoramic images. A geometric bending can be improved by a correction based on the available sidelines, nevertheless deformations dominantly in the longitudinal direction only can be determined based on ground control points. A group of neighboured images have similar deformations, allowing the determination of a correction grid, describing the systematic image errors. This improved the geometry strongly, but could not eliminate all individual and local geometric problems. The high morphologic quality of the CORONA images, but limited absolute height accuracy has been improved by merging with the highly accurate TDM90 height model. For ortho images a fitting of neighboured images was required.
3D INDOOR MAPPING WITH THE MICROSOFT HOLOLENS: QUALITATIVE AND QUANTITATIVE EVALUATION BY MEANS OF GEOMETRIC FEATURES
Authors: Weinmann M. , Jäger M. A. , Wursthorn S. , Jutzi B. , Weinmann M. , Hübner P.
Published: August 2020

Abstract. 3D indoor mapping and scene understanding have seen tremendous progress in recent years due to the rapid development of sensor systems, reconstruction techniques and semantic segmentation approaches. However, the quality of the acquired data strongly influences the accuracy of both reconstruction and segmentation. In this paper, we direct our attention to the evaluation of the mapping capabilities of the Microsoft HoloLens in comparison to high-quality TLS systems with respect to 3D indoor mapping, feature extraction and semantic segmentation. We demonstrate how a set of rather interpretable low-level geometric features and the resulting semantic segmentation achieved with a Random Forest classifier applied on these features are affected by the quality of the acquired data. The achieved results indicate that, while allowing for a fast acquisition of room geometries, the HoloLens provides data with sufficient accuracy for a wide range of applications.
COMBINED PATCH-WISE MINIMAL-MAXIMAL PIXELS REGULARIZATION FOR DEBLURRING
Authors: Han J. , Zhang S. L. , Ye Z.
Published: August 2020

Abstract. Deblurring is a vital image pre-processing procedure to improve the quality of images. It is a classical ill-posed problem. A new blind deblurring method based on image sparsity prior is proposed here. The proposed image sparsity prior combines patch-wise minimal and maximal pixels of latent image, and improves gradually the image sparsity during deblurring. An algorithm that is different with half quadratics splitting algorithm is applied under the maximum a posterior (MAP) framework. Experiment results demonstrate that the proposed method can keep more subtle texture and sharpened edges, reduce the artefacts in visual, and the corresponding evaluated indexes perform favourably against it of the state-of-the-art methods on synthesized, natural and remote sensing images (RSI) quantitatively.
FUSION OF PHOTO WITH AIRBORNE LASER SCANNING
Authors: Cledat E. , Skaloud J.
Published: August 2020

Abstract. Photogrammetry and Laser-Scanning are usually considered as complementary. Integration of these two observation methods has the potential to blend their individual advantages. The resulting benefit is likely to be higher in drone airborne mapping, which payload capacity (and thus the quality of the embedded IMU) is limited. Thus, the trajectory computed by the IMU is subject to important time-dependent errors: even if the global attitude is less adequate, it is self-coherent locally. For this reason, we propose a close integration of Photogrammetry with Laser-Scanning based on the correction of time-dependent error of the trajectory with the help of the image observations acquired by the camera. Apart from the trajectory, this hybridization requires optical correspondences between image and Laser measurements. Such full set of input data is rigorously fused together in a Bundle-Adjustment in order to better determine the trajectory, and thus the resulting point-cloud. The presented theory was practically evaluated in an airborne case against a reference solution.
INVESTIGATION ON MULTI-SENSOR FUSION STRATEGIES FOR IMPROVED ORIENTATION DETERMINATION IN MOBILE PHONE IMAGING APPLICATIONS
Authors: Elias M. , Maas H.-G.
Published: August 2020

Abstract. Thanks to the rapid technological progress in the field of mobile devices, smartphones are increasingly becoming valuable for science. They can serve as photogrammetric measurement devices with built-in cameras, micro-electro-mechanical systems for orientation and position assessment, as well as powerful processing units allowing field-based data acquisition and processing. This paper outlines a comprehensive investigation focusing on the accuracy and stability of smartphone camera rotation parameters determined by built-in smartphone sensors. For that purpose, the rotation parameters were measured under a range of different conditions. Four test scenarios were defined considering indoor- and outdoor measurements using three different devices being in static and dynamic modes. Furthermore, the influence of magnetic perturbations was investigated. The rotation parameters were determined from the measurements applying different sensor fusion approaches. Reference values for accuracy assessment were provided by a superior precision inertial measurement unit that measured the rotation parameters simultaneously to the smartphone in each experiment. The analysis of the smartphone-based rotation parameters, separated in the Euler angles azimuth, pitch and roll, shows average accuracies below 2° for pitch and roll. In comparison, azimuth shows significantly lower accuracies of more than 30° especially when the smartphone is in motion and when it is exposed to magnetic perturbations. In this regard, advanced multi-sensor fusion approaches were examined that handle such interferences to considerably improve the accuracy of azimuth measurements. In conclusion, a summary of accuracies and stabilities to be expected from smartphone sensors is given referring to ambient conditions and investigated sensor fusion strategies.