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Jurnal Matematika Sains dan Teknologi
Published by Universitas Terbuka
ISSN : 14111934     EISSN : 24429147     DOI : -
Core Subject : Education, Agriculture,
Agriculture, Biological Sciences & Forestry Mathematics Other
Merupakan media informasi dan komunikasi para praktisi, peneliti, dan akademisi yang berkecimpung dan menaruh minat serta perhatian pada pengembangan Matematika, ilmu pengetahuan dan teknologi. Diterbitkan oleh Lembaga Penelitian dan Pengabdian kepada Masyarakat, Universitas Terbuka.
Arjuna Subject : -
Articles 403 Documents
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STUDI STRUKTUR EPIDERMIS DAUN Dasymaschalon blumei Finet & Ganep. (Annonaceae) DI JAWA DAN SUMATERA Nurmawati, Subekti; Sulistiana, Susi
Jurnal Matematika Sains dan Teknologi Vol 8 No 1 (2007)
Publisher : LPPM Universitas Terbuka

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Abstract

Dasymaschalon blumei Finet & Gagnep. Is one of the species from the genus Dasymaschalon (Hook. F & Thomson) Dalla Torre & Harms which can be recognized from its peculiar moniliform fruits. It widespread in Java and Sumatera. An anatomical of leaves from herbarium specimens of D. blumei collected from Java and Sumatera has been carried out by using light microscope in Herbarium Bogoriense. The objectives of this study is to observe the leaves anatomy of D. blumei and to support the classification of  the species concept of D. blumei.  The specimens are divided into three categories based on the elevation, those were: specimens collected from < 50 m; 250 – 500 m,; and > 500 m of sea level. The result showed that from the epidermal section, the type of the stomata from the three categories were similar, and also the number and the index of the stomata. Variations however exists because of the environment factors. 
MODEL OPTIMASI PEMETAAN MATA KULIAH BERPRASYARAT UNTUK RENCANA STUDI MAHASISWA (STUDI KASUS PROGRAM STUDI MATEMATIKA FMIPA UT) Asmara Iriani Tarigan; Sitta Alief Farihati
Jurnal Matematika Sains dan Teknologi Vol. 14 No. 2 (2013)
Publisher : LPPM Universitas Terbuka

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33830/jmst.v14i2.375.2013

Abstract

Universitas Terbuka (UT) sebagai perguruan tinggi yang menerapkan sistem belajar jarak jauh menyusun kurikulum program pendidikannya berbeda dengan perguruan tinggi yang mempunyai sistem belajar tatap muka. Mahasiswa UT diberikan kebebasan dalam memilih dan menentukan mata kuliah untuk diregistrasikan pada satu semester. Dalam kurikulum program studi di UT terlihat bahwa terdapat mata kuliah yang mempunyai hubungan keterkaitan materi antarmata kuliah. Hubungan tersebut digambarkan sebagai hubungan prasyarat antarmata kuliah. Untuk membuat rencana studi, mahasiswa perlu mengetahui hubungan keterkaitan materi antarmata kuliah tersebut sehingga dapat menentukan mata kuliah yang akan diregistrasi pada suatu semester. Artikel ini mengidentifikasi keterkaitan materi antarmata kuliah untuk dipetakan dalam rencana studi. Untuk memetakan mata kuliah berprasyarat tersebut perlu dilakukan optimasi pemetaan mata kuliah. Tujuan pengembangan model optimasi ini adalah untuk memaksimalkan hubungan keterkaitan materi dengan memetakan mata kuliah berprasyarat secara berurutan. Hal ini juga berarti meminimalkan jarak antarsemester urutan mata kuliah berprasyarat. Model optimasi yang dikembangkan berupa Integer Linear Programming. Model tersebut kemudian diimplementasikan pada kurikulum Program Studi Matematika FMIPA UT. Hasil simulasinya berupa rencana studi bagi mahasiswa Program Studi tersebut. Dari analisis hasil simulasi diperoleh rencana studi dengan jumlah maksimal 21 dan 23 SKS per semester merupakan pilihan terbaik bagi mahasiswa. Universitas Terbuka (UT) as an open and distance learning institution has curriculum that different from face to face universities. UTs students can take any course since UT offers all courses in any semester. Some courses are prerequisite for some other courses. Students need to be careful in taking the courses because some courses also have same schedule in examination. Besides, they also need to consider the courses that have prerequisite. This article identifies the relationship between some courses that need to be considered by the students when they register the courses. A map of courses was developed by using Integer Linear Programming. This map was intended to maximize the information of interrelationship between courses in rows. The distance between prerequisite courses was minimized for some semesters. This model was implemented on Mathematics study program at Faculty of Mathematics and Science in UT. The result of simulation was a study planning for Mathematics students in taking courses in every semester. The optimal number of credits semester that need to be registered was 21 or 23 credits.
FORMULASI PELAPIS TIPIS AKTIF DAPAT DIMAKAN DARI MALTODEKSTRIN DAN EKSTRAK ANGKAK DAN PEMANFAATANNYA SEBAGAI PELAPIS DAN PENGAWET BAKSO Ridawati, Ridawati; Alsuhendra, Alsuhendra
Jurnal Matematika Sains dan Teknologi Vol 17 No 2 (2016)
Publisher : LPPM Universitas Terbuka

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Abstract

This research aims was to obtain the active edible coating of with the addition of red rice extract as meatballs coating. This research was conducted in four steps: extraction of antimicrobial compounds from red rice, preparation the red rice edible coating, formulation meatballs and application the red rice edible coating, and analysis of physical properties and organoleptic. The quality of meatballs was strongly influenced by the quality of materials that has been used and the process of production. The addition of red rice extract as much as 0,125%, 0,25% and 0,5% compared with the control and analysis by the sensory test. Statistically, the addition of red rice extract on making meatballs did not effect the level of panelists from the aspect of shape, flavor, color and aroma of the meatballs (α = of 0,05%). The use of red rice extracts in the production of edible film for coating the meatballs affect the texture of the meatballs that has been stored for 0, 6, 12 and 18 hours. Most of the panelists mentioned meatballs controls have somewhat glutinous, dry, elastic and compact. After 18 hours of storage meatball has a glutinous, wet, slimy, less elastic and less compact, especially meatballs controls (38,5%). Penelitian ini bertujuan untuk mengembangkan pelapis tipis aktif dapat di makan (active edible coating) dari maltodekstrin dengan penambahan ekstrak angkak sebagai pelapis bakso. Penelitian ini dilakukan dalam 4 tahap, yaitu ekstraksi senyawa antimikroba dari angkak, pembuatan larutan active edible coating dengan penambahan ekstrak angkak, pembuatan bakso dan pelapisannya dengan larutan active edible coating, dan analisis sifat fisik, organoleptik produk bakso yang telah dilapis dengan active edible coating. Dari penelitian ini diperoleh informasi tentang teknologi proses pembuatan active edible coating dari maltodekstrin dengan penambahan senyawa antimikroba dari angkak, aktivitas antimikroba dari larutan active edible coating yang dikembangkan, serta produk bakso yang diberi active edible coating. Kualitas dari bakso daging sapi sangat dipengaruhi oleh kualitas bahan baku dan bahan tambahan yang digunakan serta proses pembentukan adonan. Penambahan ekstrak angkak sebanyak 0,125%, 0,25% dan 0,5% dibandingkan dengan control tetap disukai oleh panelis. Secara +statistik, penambahan ekstrak angkak pada pembuatan bakso tidak berpengaruh terhadap tingkat kesukaan panelis dari aspek bentuk, rasa, warna, dan aroma dari bakso (α=0,05%). Penggunaan ekstrak angkak dalam pembuatan edible film untuk pelapis bakso berpengaruh terhadap tekstur dari bakso selama penyimpanan 0, 6, 12 dan 18 jam. Sebagian besar panelis menyebutkan bakso kontrol memiliki tekstur agak lengket-lengket, kering, kenyal dan kompak. Setelah penyimpanan 18 jam bakso memiliki tekstur lengket, basah, berlendir, kurang kenyal dan kurang kompak, terutama bakso kontrol (38,5%).
ANALISIS VEGETASI PADA TEGAKAN YANG TERINVASI AKASIA (Acacia nilotica) DI TAMAN NASIONAL BALURAN, JAWA TIMUR Djufri, Djufri
Jurnal Matematika Sains dan Teknologi Vol 7 No 2 (2006)
Publisher : LPPM Universitas Terbuka

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Abstract

The research was done in Baluran National Park, Banyuwangi East Java in April until June 2004. The objectives of this research are:  to determine species composition, importance value of species, diversity index and evenness index, similarity index, and distribution pattern of species. This research used quadratic method. The determination of the species distribution was calculated using Poisson distribution formula and classification of community using similarity index formula and cluster analysis. The results of this research indicated that, there were 63 species of plants including 18 families. The importance value was between 0,97-42,58, the diversity index was between 1,1504-2,7556 and evenness index was between 1,1067-1,7854. The result of classification community indicated that savanna Baluran National Park can be devided into three groups (a). Open savanna no A. nilotica stand, (b).savanna with density of A. nilotica stand 1500-3000 individuals/ha, and (c).savanna with dense A. nilotica stand > 3000 individuals/ha.      
MENGATASI MASALAH MULTIKOLINEARITAS DAN OUTLIER DENGAN PENDEKATAN ROBPCA (STUDI KASUS ANALISIS REGRESI ANGKA KEMATIAN BAYI DI JAWA TIMUR) Sunaryo, Sony; Setiawan, Setiawan; Siagian, Tiodora Hadumaon
Jurnal Matematika Sains dan Teknologi Vol 12 No 1 (2011)
Publisher : LPPM Universitas Terbuka

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Abstract

Multicollinearity and outliers existence in data can be detected by various techniques. Principal Component Analysis (PCA) is one of the statistical techniques that can be used to handle data reduction and multicollinearity problem. However, PCA is very sensitive to outliers as it based on the mean and the covariance matrix. Hubert et al. (2005) developed ROBPCA, a robust PCA to the outliers existence. The ROBPCA combines PP technique and Minimum Covariant Determinant (MCD) method for solving outliers problem. In the present study, ROBPCA is applied to the study case of the regression analysis of infant mortality rate in East Java Province in 2009. The result shows that ROBPCA is more robust compare to PCA when data contains outlier. ROBPCA can explain 85.6 percent of variation by 2 principal components, whereas, PCA needs 3 principal components to explain 86.6 percent of variation. Moreover, ROBPCA produces higher coefficient determination which means the regression model using ROBPCA is better in explaining response variable. The study findings also revealed that the average of duration of exclusive breastfeeding has the largest contribution in lowering infant mortality rate followed by percentage of delivery assisted by medical provider and percentage of households that have access to safe drinking water.  
APLIKASI JARINGAN SYARAF TIRUAN UNTUK MENGENALI TULISAN TANGAN HURUF A, B, C, DAN D PADA JAWABAN SOAL PILIHAN GANDA (Studi Eksplorasi Pengembangan Pengolahan Lembar Jawaban Ujian Soal Pilihan Ganda Di Universitas Terbuka) Dwi Astuti Aprijani; Unggul Utan Sufandi
Jurnal Matematika Sains dan Teknologi Vol. 12 No. 1 (2011)
Publisher : LPPM Universitas Terbuka

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Abstract

Artificial Neural Network (ANN) can be applied to recognice pattern, particularly at the stage of data classification. This study used a multilayer perceptron backpropagation ANN, an unsupervised learning algorithm, to recognize the pattern of uppercase handwriting on the answer sheet of multiple-choice exams. The application of this network involves mapping a set of input against a reference set of outputs. In this research, ANN was trained using 8000 handwritten uppercase characters (A, B, C, and D) consisting of 6000 training data characters (1500 characters for each letter) and 2000 testing data characters (500 characters for each letter). The result showed that for the most optimal performance, the architecture and network parameters were 10 neurons in hidden layer, learning rate of 0.1 and 3000 iteration times. The accuracies of the result using the optimal network architecture and parameters were 90.28% for training data and 87.35% for testing data.
Penentuan Ukuran Sumur Resapan Berdasarkan Luasan Rumah, Curah Hujan, dan Infiltrasi (Studi Kasus di Komplek Perumahan Reni Jaya, Pamulang, Tangerang, Banten) Susanto, Agus; Suhardianto, Anang
Jurnal Matematika Sains dan Teknologi Vol 6 No 1 (2005)
Publisher : LPPM Universitas Terbuka

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Abstract

All developers should consider continuity of water supply for the house dweller, as much rain water falling on the house yard will be lost as run-off water instead of filling the shallow ground water. Hence, there should be absorption wells to absorb the water falling from house roof. By so doing, it can increase ground water supply.  However, there should be an exact dimension of the absorption well, as the amount of the falling water from house roof depends on the roof width. The dimension of the well for each house can be measured based on roof width, rain fall, and soil capability to absorb water or infiltration capability. For unrennovated house, well diameter are 80 to  120 cm and its total depth are 60 to 160 cm. While for rennovated house, well diameter are 90 to 140 cm and total depth are 120 to 190 cm
METODE ANALISIS KOMPONEN INDEPENDEN DAN PENGGUNAANNYA PADA DEKOMPOSISI SINYAL ELEKTROENSEFALOGRAFI Pattirajawane, Ignatius Danny; Suwangto, Erfen G
Jurnal Matematika Sains dan Teknologi Vol 19 No 2 (2018)
Publisher : LPPM Universitas Terbuka

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Abstract

Independent component analysis (ICA) is a multivariate statistical method that is used to find factors or independent component from the data. ICA is a further development of factor analysis (FA). The different of ICA to FA is that in FA the distribution of the data is assumed to be normal (gaussian) while it is non-gaussian in ICA. In this paper we will elucidate ICA shortly from the formulation of the problem, the linear modeling of the problem, the solution of the problem through maximum likelihood method and information theory approach, to the formulation of computational algorithm through neural network optimalization of weight matrix. Since one of the common application of ICA is in analysis of biomedical signal, in this paper we will give an illustration of decomposition of electroencephalographic signals in to independent components. This action could help researchers or cliniciansto differentiate brain activities from artifact such as mucles of heart activities. The data samples are taken from open source EEG dataset and would be analyze with EEGLAB which is an open source extension module to Matlab. Analisis komponen independen (AKI) merupakan metode statistik multivariat yang digunakan untuk menemukan faktor atau komponen independen dari suatu data. AKI merupakan pengembangan lebih lanjut dari analisis faktor (AF). Perbedaannya AKI dengan AF ialah komponen diasumsikan berdistribusi normal (gaussian) pada AF, sedangkan pada AKI komponen diasumsikan berdistribusi non-gaussian. Pada makalah ini akan dipaparkan secara singkat AKI mulai dari perumusan masalah yang memunculkan metode AKI serta permodelan linear yang dihasilkan, pemecahan masalah linear tersebut melalui metode maximum likelihood (ML) dan pendekatan teori informasi, hingga formulasi algoritma komputasi melalui pendekatan optimalisasi matriks beban pada model jaringan syaraf. Karena salah satu penerapan AKI adalah pada analisis sinyal biomedis, dalam makalah ini akan disajikan ilustrasi dekomposisi sinyal elektroensefalografi (EEG) ke dalam komponen independen. Tindakan ini dapat membantu peneliti atau tenaga medis dalam membedakan mana sinyal dari otak dan mana yang merupakan artefak seperti sinyal dari aktivitas otot atau jantung. Data yang digunakan berupa data set EEG sumber terbuka dari daring yang kemudian dianalisis dengan menggunakan perangkat lunak EEGLAB yang merupakan modul tambahan atas perangkat lunak Matlab.
PENGEMBANGAN SEA FARMING BUDIDAYA KERAMBA JARING APUNG (KJA) KERAPU (EPHINEPHELUS SP.) DI INDONESIA Anton Gunarto
Jurnal Matematika Sains dan Teknologi Vol. 4 No. 1 (2003)
Publisher : LPPM Universitas Terbuka

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Seafarming is an activity of culturing marine organisms, which encompasses broodstock selection, spawning, hatchery, juvenile culture, and mature stages. At the last stage, the fish, once resist to diseases and weather fluctuation, is released to water bodies for restocking purposes. Through restocking, fisherman's cathces are expected to increase in a sustainable manner. One of the technology that can be used for seafarming is grouper cage culture. This technology is quite productive and intensive, with net cages construction are anchored to float at coastal waters. Cage culture of grouper has a good prospective in Indonesia as the fish is highly valued in international market. Furthermore, Indonesia has very high potential coastal waters for grouper cage culture expansion
STRATEGI BUDIDAYA IKAN KOKI BASTER (Carasius Auratus) RAMAH LINGKUNGAN DALAM UPAYAMENINGKATAN PRODUKSI Mariam, Susanti; Supriyono, Eddy; Warlina, Lina
Jurnal Matematika Sains dan Teknologi Vol 19 No 2 (2018)
Publisher : LPPM Universitas Terbuka

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Abstract

Koki baster fish (Carasius auratus) or goldfish, besides as ornamental fish are also used as fish feed and fishing bait which demand tends to increase from year to year. However, from 2012 to 2015, the production of koki baster fish has decreased. This study aims to analyze the application of the management of koki baster fish in Cisaat Subdistrict, Sukabumi Regency, so that a management strategy can be formulated in developing environmentally friendly koki baster in Sukabumi Regency. Data collection was conducted through interviews, observations, questionnaires and documentation. The questionnaires were distributed to 100 respondents who were conducting hatchery for koki baster that scattered in 13 villages in Cisaat Subdistrict. As comparative data, the hatchery of koki baster fish was conducted in the research pond. The variables used are the aquaculture stage (x) consisting of lime dosage, organic fertilizer, anorganic fertilizer, water height, female parent, parent feed, comparison of male and female parent, parent age, larvae feed and duration to number of larvae (y). The variables were analyzed by validity, reliability, multiple regression analysis and principal component analysis using SPSS and Minitab application. Based on the results of multiple regression analysis obtained the relationship between variables in the seeding stage with the number of larvae. Correlation test showed that the variable use of fertilizers had a positive correlation of 69,5% to the number of larvae. Conversely, the variable water height has a negative value on the number of larvae, which is -3.5%. The principal component analysis showed that the variable use of organic fertilizer, anorganic fertilizer and larvae feed was in the first component area. It means that the variable has a large correlation to the number of larvae. The conclusion of there search is the community does not yet have standard in managing fish hatching of koki baster fish, they only rely on experience and habits so that the obtained production is still low. Strategies to increase the production of koki baster fish are need to be standardized on how to farm koki baster fish, standarized koki baster fish and community coaching on the need to carry out the stages of koki baster fish breeding in accordance with the good and environmentally friendly method of fish hatchery. Ikan koki baster (Carasius auratus) selain sebagai ikan hias juga digunakan sebagai pakan ikan dan umpan pancing yang permintaannnya cenderung meningkat dari tahun ke tahun. Namun demikian dari tahun 2012 hingga 2015, produksi ikan baster mengalami penurunan. Penelitian ini bertujuan menganalisa penerapan manajemen usaha budidaya ikan koki baster di Kecamatan Cisaat Kabupaten Sukabumi sehingga dapat dirumuskan strategi pengelolaan dalam pengembangan budidaya ikan koki baster di Kabupaten Sukabumi yang ramah lingkungan. Pengumpulan data dilakukan melalui wawancara, pengamatan, kuesioner dan dokumentasi. Instrumen yang digunakan adalah kuesioner yang dibagikan kepada 100 orang responden yang melakukan kegiatan pembenihan ikan koki baster di 13 desa yang tersebar di Kecamatan Cisaat. Sebagai data pembanding dilakukan kegiatan pembenihan ikan koki baster di kolam penelitian. Variabel yang digunakan dalam analisis keterkaitan produksi adalah tahapan budidaya (x) yang terdiri atas dosis kapur, pupuk organik, pupuk anorganik, tinggi air, induk betina, pakan induk, perbandingan induk jantan dan betina, umur induk, pakan larva, dan lama pemeliharaan terhadap jumlah larva (y). Variabel-variabel tersebut dianalisis dengan regresi berganda dan analisa komponen utama menggunakan aplikasi SPSS dan Minitab yang sebelumnya dilakukan uji validitas dan reliabilitas.  Berdasarkan hasil analisa regresi berganda diperoleh keterkaitan antara varibael-variabel dalam tahapan pembenihan dengan jumlah larva. Uji korelasi menunjukan variabel penggunaan pupuk berkorelasi positif sebesar 69,5% terhadap jumlah larva.  Sebaliknya variabel tinggi air memiliki nilai korelasi negatif terhadap jumlah larva yaitu sebesar -3,5%.  Analisa komponen utama menunjukan bahwa variabel penggunaan pupuk organik, pupuk anorganik dan pakan larva  berada pada wilayah first component artinya variabel tersebut memiliki korelasi yang besar terhadap jumlah larva. Kesimpulan dari penelitian ini adalah masyarakat belum memiliki standar dalam melaksanakan pengelolaan pembenihan ikan koki baster, hanya mengandalkan pengalaman dan kebiasaan saja sehingga produksi yang diperoleh masih rendah. Strategi untuk meningkatkan produksi ikan koki baster di masyarakat, perlu adanya standar tentang cara budidaya ikan koki baster, standardisasi ikan koki baster dan pembinaan kepada masyarakat tentang perlunya melaksanakan tahapan-tahapan budidaya ikan koki baster sesuai dengan cara pembenihan ikan yang baik dan ramah lingkungan.

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