Feature selection to enhance android malware detection using modified term frequency-inverse document frequency (MTF-IDF)

This research synthesizes an evaluation of feature selection algorithm by utilizing Term Frequency-Inverse Document Frequency (TF-IDF) as the main algorithm in Android malware detection. The TF-IDF algorithm is used to filter Android features filtered before detection process. However, IDF is unaware to the training class labels and gives incorrect weight value to some features. Therefore, the proposed approach that is Modified Term Frequency – Inverse Document Frequency (MTF-IDF) algorithm give more focus on both sample and features to give correct weight value to some features. The proposed algorithm considered features based on its level of importance where weight given based on number of features involved in the sample. The related best features in the sample are selected using weight and priority ranking process using K-means. This ensures that only important malware features are selected in the Android application sample. These experiments are conducted on a sample collected from DREBIN. Comparison between existing TF-IDF algorithm and MTF-IDF algorithm have been made under various conditions such as tested on different number of sample size, different number of features used and integration of different types of features. The results showed that feature selection using MTF-IDF can improve Android malware detection analysis. It was proven that MTF-IDF is an effective Android malware detection algorithm regardless of different kinds of features or sample sizes used. MTF-IDF algorithm also proved that it can give appropriate scaling for all features in analyzing Android malware detection

Pemahaman Warga Matematika terhadap Konteks Visi, Misi, Tujuan Program Studi Pendidikan Matematika

The purpose of this study is to explain the level of student understanding of the context of the vision, mission, and objectives of the Mathematics Education Study Program (PMA Study Program). This study uses a quantitative descriptive approach. The questionnaire used is an open and closed questionnaire, meaning the questionnaire contains questions with four (4) answer choices and is accompanied by an explanation of the choice of the answer. The research sample was set at 20%, namely as many as 61 students from each semester. The results of the study show; (1) almost all students are 60 people (98.36%) who understand the context of the vision of superior words, 13 people including very understanding (21.31%) and able to interpret professional words, and 60 people are very understanding (98.36% ) and able to interpret the words Rahmatan Lil Alamin, (2) Students almost entirely understand the mission of the first PMA Study Program (98.36%), and so on with the same percentage for the second, third, and fourth missions, (3) Level Mathematicians' understanding of the context of the Study Program's objectives is to understand only the first goal with the number of students 55 students (90.16%), while the second, third, fourth, fifth and sixth goals are in the very understand category of 9 people (14.75%). So, in general, it can be said that PMA Study Program students almost all understand the context of the new PMA vision, mission, and objectives of the Study Progra

Mapping seagrass from satellite remote sensing data

This paper reviews some early results on a method adopted in mapping seagrass using Landsat-5 Thematic Mapper data. Seagrass information was extracted from satellite remotely sensed data using depth invariant index (DII) where the sea bottom features were expressed as index (i.e. each bottom type was represented by one index). DII was determined from radiance values recorded in band 1, 2 and 3 which taking into account the effect of water attenuation. Sea truth samples collected during the satellites overpass were used in calibrating DII and an independent accuracy assessment of information extracted

Simulation of shoreline change using AIRSAR and POLSAR C-band data

This paper presents a new approach for modeling shoreline change due to wave energy effects from remotely sensed data. The airborne AIRSAR and POLSAR data were employed to extract wave spectra information and integrate them with historical remotely sensed data such as aerial photography data to model the rate of change of the shoreline. A partial differential equation (PDE) of the wave conversion model was applied to investigate the wave refraction patterns. The volume of sediment transport at several locations was estimated based on the wave refraction patterns. The shoreline change model developed was designed to cover a 14-km stretch of shoreline of Kuala Terengganu in Peninsular Malaysia. The model utilized data from aerial photographs, AIRSAR, POLSAR, ERS-2, and in situ wave data. The results show that the shoreline rate of change modeled from the quasi-linear wave spectra algorithm has a significant relationship with one estimated from historical vector layers of aerial photography, AIRSAR, and POLSAR data. With the quasi-linear algorithm, an error of ±0.18 m/year in shoreline rate of change determination was obtained with Cvv band

PENGARUH ANIMASI BERGERAK TERHADAP PEMAHAMAN KONSEP MATEMATIKA SISWA KELAS XII DI SMAN 1 LANGSA

Pemahaman konsep merupakan suatu kemampuan yang sangat penting dalam pembelajaran matematika. Dengan kemampuan pemahaman konsep siswa akan mampu memanfaatkan atau mengaplikasikan apa yang telah dipahaminya serta mengungkapkannya kembali dengan makna yang sama dalam kegiatan belajar. Tujuan dalam penelitian ini adalah untuk mengetahui apakah animasi bergerak dengan berbantuan software Cabri 3D berpengaruh terhadap pemahaman konsep matematika siswa pada materi dimensi tiga. Penelitian ini dilaksanakan di SMAN 1 Langsa tahun ajaran 2019/2020. Penelitian ini termasuk dalam jenis penelitian kuantitatif dengan desain One Group Pretest-Posttest Design. Populasi dalam penelitian ini adalah seluruh siswa  kelas XII SMA Negeri 1 Langsa sebanyak 317 orang yang terdiri dari 10 kelas, sedangkan sampelnya adalah siswa kelas XII MIA-8 dengan jumlah siswa 32 orang. Hasil penelitian menunjukkan bahwa thitung = 22,88 dan ttabel = 1,696 maka thitung  >  ttabel yaitu 22,88 > 1,696 sehingga diperoleh H0 ditolak dan Ha diterima. Dengan demikian dapat disimpulkan bahwa terdapat pengaruh animasi bergerak terhadap pemahaman konsep matematika siswa kelas XII di SMA Negeri 1 Langsa

Analisis Kesalahan Siswa SMP Dalam Menyelesaikan Soal Pada Materi Bangun Ruang Sisi Datar

Abstract: The low ability of students to solve problems about surface area and volume of flat side spaces is still a concern and needs improvement. Conducting analysis of student errors is one of the improvement efforts. This study aims to describe the types of errors made by junior high school students in solving surface area problems and the volume of flat side space. This type of research is a qualitative description. Data collection was carried out by means of written tests and interviews. Written tests are used to look at students 'mistakes, while interviews are used to find out more about students' understanding of the questions given. The results of this study indicate that the errors made by students in completing the problem of surface area and volume of flat side space are: 1) conceptual errors, 2) operating errors and 3) procedural errors. The percentage of conceptual errors, which is 41.11%. The percentage of operating errors was 6.11%, and the percentage of procedural errors was 21.67%. Given the large percentage of conceptual errors made by students, it is expected to be able to change the teacher's strategy in teaching the material surface area and volume of flat side spaces to better enhance students' conceptual understanding. Abstrak: Rendahnya kemampuan siswa untuk memecahkan masalah tentang luas permukaan dan volume ruang sisi datar masih menjadi perhatian dan perlu perbaikan. Melakukan analisis kesalahan siswa adalah salah satu upaya peningkatan. Penelitian ini bertujuan untuk mendeskripsikan jenis kesalahan yang dibuat oleh siswa sekolah menengah pertama dalam memecahkan masalah luas permukaan dan volume ruang sisi datar. Jenis penelitian ini adalah deskripsi kualitatif. Pengumpulan data dilakukan dengan tes tertulis dan wawancara. Tes tertulis digunakan untuk melihat kesalahan siswa, sedangkan wawancara digunakan untuk mencari tahu lebih banyak tentang pemahaman siswa tentang pertanyaan yang diberikan. Hasil penelitian ini menunjukkan bahwa kesalahan yang dilakukan oleh siswa dalam menyelesaikan masalah luas permukaan dan volume ruang sisi datar adalah: 1) kesalahan konseptual, 2) kesalahan teknikal dan 3) kesalahan prosedural. Persentase kesalahan konseptual, yaitu 41,11%. Persentase kesalahan teknikal adalah 6,11%, dan persentase kesalahan prosedural adalah 21,67%. Mengingat persentase besar kesalahan konseptual yang dibuat oleh siswa, diharapkan dapat mengubah strategi guru dalam mengajar area permukaan material dan volume ruang sisi datar untuk lebih meningkatkan pemahaman konseptual siswa

Integration of Remote Sensing-GIS Techniques for Mapping and Monitoring Seagrass and Ocean Colour off Malaysian Coasts

This paper describes seagrass and ocean colour mapping off Peninsular Malaysia. The seagrass were extracted from visible bands of Landsat TM using the depth invariant index of the scabottom type. The ocean colour which much referred to plankton concentration is derived by regressing samples from known site collected at time of satellite overpass. Out these information were then input into GIS database which were also being established to assist the Marine Fisheries Management and Development Centre in managing and monitoring coastal areas This paper also addresses the experience gained in building spatial database for coastal areas various dala collected from various mapping environments were carried out

KEEFEKTIFAN METODE PEMBELAJARAN IMPROVE TERHADAP KEMAMPUAN PEMECAHAN MASALAH MATEMATIKA SISWA DI SMK NEGERI 5 KOTA LANGSA (Studi Penelitian Eksperimen pada Siswa Kelas X SMKN 5 Kota Langsa)

Metode pembelajaran Improve merupakan metode pembelajaran yang memberikan konsep baru melalui pertanyaan-pertanyaan yang membangun pengetahuan siswa. Tujuan penelitian ini adalah untuk mengetahui apakah metode pembelajaran Improve efektif terhadap kemampuan pemecahan masalah matematika siswa di SMK Negeri 5 Kota Langsa. Jenis penelitian ini adalah penelitian kuantitatif dengan menggunakan penelitian eksperimen. Desain penelitian pada penelitian ini menggunakan desain Randomized Control Group Pretest-Posttest yaitu pembagian dua kelompok penelitian yaitu kelompok penelitian eksperimen dengan menggunakan metode pembelajaran Improve dan kelompok penelitian kontrol dengan menggunakan metode pembelajaran konvensional. Populasi dalam penelitian ini adalah seluruh siswa kelas X SMK Negeri 5 Langsa tahun ajaran 2017/2018 yang berjumlah 80 siswa, sedangkan sampel pada penelitian ini ialah kelas X TKJ-1 yang berjumlah 20 siswa sebagai kelas eksperimen dan kelas X TKJ-2  yang berjumlah 19  siswa sebagai kelas kontrol. Teknik pengumpulan data pada penelitian ini adalah tes. Sebelum memberikan tes kepada siswa, instrumen tes terlebih dahulu diujikan pada siswa yang telah mempelajari materi SPLDV sebelumnya yaitu dengan menghitung validitas, reliabilitas, tingkat kesukaran dan daya pembeda butir soal. Teknik analisis data pada penelitian ini menggunakan rumus uji t. Hasil penelitian disimpulkan bahwa metode pembelajaran Improve efektif terhadap kemampuan pemecahan masalah matematika siswa di SMKN Langsa. Hal ini dapat dilihat dari nilai thitung yang lebih besar dari nilai ttabel, yaitu,  2,026. Sehingga metode pembelajaran Improve efektif terhadap kemampuan pemecahan masalah matematika siswa di SMK Negeri 5 Langsa

Effects of biofuels properties on aircraft engine performance

Purpose-The purpose of this paper is to examine the effects of heat capacity and density of biofuels on aircraft engine performance indicated by thrust and fuel consumption. Design/methodology/approach-The influence of heat capacity and density was examined by simulating biofuels in a two-spool high-bypass turbofan engine running at cruise condition using a Cranfield in-house engine performance computer tool (PYTHIA). The effect of heat capacity and density on engine performance was evaluated through a comparison between kerosene and biofuels. Two types of biofuels were considered: Jatropha Bio-synthetic Paraffinic Kerosene (JSPK) and Camelina Bio-synthetic Paraffinic Kerosene (CSPK). Findings-Results show an increase in engine thrust and a reduction in fuel consumption as the percentage of biofuel in the kerosene/biofuel mixture increases. Besides a low heating value, an effect of heat capacity on increasing engine thrust and an effect of density on reducing engine fuel consumption are observed. Practical implications-The utilisation of biofuel in aircraft engines may result in reducing over-dependency on crude oil. Originality/value-This paper observes secondary factors (heat capacity and density) that may influence aircraft engine performance which should be taken into consideration when selecting new fuel for new engine designs

Kompetensi Kerja Pegawai Polis Konstabel Dari Cawangan Tugas Am, Shah Alam, Selangor

Tujuan utama kajian ini ialah untuk mengenal pasti keperluan kompetensi kerja pegawai polis konstabel Cawangan Tugas Am . Kajian ini juga akan menentukan tahap guna masa, kepentingan,kerumitan dan kekerapan kompetensi tersebut . Sistem Survei Prestasi Kerja ( WPSS ) telah digunakan untuk mengenal pasti kompetensi kerja .Tiga teknik yang digunakan untuk mengumpul data WPSS ialah melalui pemerhatian,analisis kandungan kerja dan temuduga . Seramai 53 responden telah dipilih daripada pegawai polis konstabel yang bertugas di Cawangan Tugas Am di Ibu Pejabat Daerah Polis,Shah Alam,Selangor