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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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PENERAPAN REGRESI LOGISTIK BINER UNTUK MENGUKUR RESIKO ANEMIA DENGAN STATUS GIZI IBU HAMIL Suhardi, Deddy A; Fadila, Ila
Jurnal Matematika Sains dan Teknologi Vol 17 No 1 (2016)
Publisher : LPPM Universitas Terbuka

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Abstract

The prevalence of anaemia is an important health indicator for pregnant women. This paper demonstrates the use of logistic regression modelling techniques for an ordinal binary in terms of both response and predictor variables. By using 120 cross-sectional data to measure the attitude of pregnant women observed at three Community Healthcare Center (CHC) in the Serang District - Banten Province on September 2012, we investigated a factor predicting anaemia and tested whether changes in nutritional status were associated with changes in anaemia status. The anaemia status threshold using haemoglobin concentration (g/dl) was measured by the Cyanmethemoglobin method, and the nutritional status was categorized by measuring Upper Arm Circumference (cm). This paper discusses the roles of nutritional status determining the risks of anaemia and compares the results obtained using the contingency analytical methods. The paper also demonstrates how the logistic regression modelling approach dealing with the odds ratio statistic can better explain the risks of anaemia determined by nutritional status found in the CHC studied. We found that anaemia status is affected by nutritional status (coef. 1,07; p. 0,066), and the results of contingency analysis reveals that anaemia satus is associated with nutritional status (chi-sq. 3,60; p. 0,058). According to odds ratio statistic of the logistic regression (OR 2,92), the risks of anaemia on pregnant women with cronic energy deficiency would be 2,92times higher than they are on normal nutritions.   Prevalensi anemia pada kehamilan merupakan salah satu indikator penting kesehatan ibu hamil. Paper ini membahas teknik regresi logistik untuk mengukur resiko anemia ibu hamil berdasarkan status gizinya. Rancangan model hanya terdiri dari satu variabel respon dan satu prediktor skala biner. Hasil analisis regresi logistik dibandingkan dengan analisis chi-kuadrat tabel kontingensi. Estimasi parameter regresi menggunakan data cross-sectional 120 ibu hamil yang diamati langsung dari tiga Puskesmas di Kabupaten Serang, Banten, pada September 2012. Status anemia dikategorikan dari pengukuran kadar hemoglobin (g/dl) menggunakan metode cyanmethemoglobin, sedangkan status gizi dari pengukuran pita lingkar lengan atas (cm). Analisis regresi logistik menunjukkan satus anemia dipengaruhi status gizi (koefisien regresi status gizi 1,07; odds ratio 2,92; p. 0,066). Analisis chi-kuadrat menunjukkan status anemia berhubungan dengan status gizi (chi-kuadrat 3,60; p. 0,058). Statistik odds ratiopada kasus ini mendeskripsikan sejauh mana peran status gizi menentukan resiko anemia ibu hamil. Resiko anemia 2,92 kali lebih tinggi bagi ibu hamil dengan kondisi gizi kurang energi kronik daripada ibu hamil dengan gizi baik.
PENGGUNAAN KRITERIA rcP PADA PEMILIHAN PEUBAH BEBAS TERBAIK JIKA TERDAPAT MULTIKOLINEARITAS Sugiarti, Harmi
Jurnal Matematika Sains dan Teknologi Vol 8 No 1 (2007)
Publisher : LPPM Universitas Terbuka

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Abstract

Some procedures can be used for selecting independent variables, one of them is the procedure of all possible regression with robust Cp (RCp) criterion. This statistic is not sensitive with multicollinearity in model and outlier residuals. The aim of this article is to investigate the use of RCp criterion in selecting independent variables. The result of the simulation experimental data shows that the RCp criterion fits enough to select independent variables. 
PERILAKU KONSUMSI DAN STATUS GIZI ANAK SEKOLAH DASAR DI KOTA SERANG Marhamah, Marhamah; Abzeni, Abzeni; Juwita, Juwita
Jurnal Matematika Sains dan Teknologi Vol 15 No 2 (2014)
Publisher : LPPM Universitas Terbuka

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Anak usia sekolah dasar merupakan aset negara dalam bentuk sumber daya manusia yang sangat penting dalam mendukung keberhasilan pembangunan bangsa. Anak usia sekolah dasar memerlukan perhatian khusus dalam hal kecukupan gizi sesuai kebutuhannya. Anak dengan gizi kurang yang kronis memiliki IQ lebih rendah dibandingkan anak yang tidak mengalami masalah gizi. Masalah gizi anak usia sekolah saat ini tidak hanya pada masalah gizi kurang, namun berkembang dengan meningkatnya prevalensi gizi lebih berupa overweight dan obesitas. Kebiasaan jajan makanan dan minuman yang berenergi tinggi namun kekurangan zat gizi lainnya menjadi salah satu faktor yang perlu mendapat perhatian, karena kelebihan energi memicu anak mengalami kelebihan berat badan dan berpotensi menderita obesitas. Penelitian ini dilakukan untuk menganalisis hubungan perilaku konsumsi terhadap status gizi anak sekolah dasar di Kota Serang. Data dikumpulkan menggunakan kuesioner, mencakup data kebiasaan konsumsi pangan utama dan makanan serta minuman jajanan, pengukuran antropometri dan status gizi anak SD. Hasil penelitian menunjukkan bahwa kebiasaan sarapan sebelum berangkat ke sekolah berkorelasi positif sangat nyata terhadap status gizi siswa, dengan r =0,263**. Hasil penelitian ini merekomendasikan agar siswa sekolah dasar membiasakan diri sarapan setiap pagi serta harus memperhatikan jumlah dan jenis makanan dan minuman jajanan untuk menghindari risiko kelebihan berat badan karena mengonsumsi makanan yang kandungan gizinya tidak berimbang.
ANALISIS SERAPAN KARBONDIOKSIDA BERDASARKAN TUTUPAN LAHAN DI KOTA PALANGKA RAYA Fidayanti, Neny
Jurnal Matematika Sains dan Teknologi Vol 17 No 2 (2016)
Publisher : LPPM Universitas Terbuka

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This research was made not only to find out scope of green area and total of carbon dioxide’s emission in Palangka Raya which can be absorbed by vegetation but also to find out suitability of land use of green area of Palangka Raya with necessity of green open space in Palangka Raya. The research was a description about environment condition in Palangka Raya which related to total of carbon dioxide’s emission and scope of vegetated land. The result of the research based on analysis of land cover and carbon dioxide absorption showed that scope of vegetated land in Palangka Raya was 219.498.7 hectares and it was still able to absorb all carbon dioxide’s emission amount to 387.366,248 tons which came from energy consumption and respiration of Palangka Raya’s inhabitants. Based on the extent of its region, urban area of Palangka Raya needed green open space (RTH) with wide to 14.096,1 hectares, based on the number of inhabitants was needed 581,84 hectares RTH which consisted of city park, city forest, median, river border and cemetery, based on equality of water use was needed 323,75 hectares RTH and based on carbon dioxide’s emission was needed 3.331,38 ha RTH. Based on suitability plan of land use of green area in urban area of Palangka Raya, there was lack of green open space. Sub district Pahandut lack of RTH based on extent of its district (-3.513,23 hectares), number of inhabitants (-244,85 hectares), need of water (-142,45 hectares) and carbon dioxide’s emission (-2.368,88 hectares) while sub district Jekan Raya lack of RTH based on extent of its district (-9.071,96 hectares) and carbon dioxide’s emission (-5.660,93 hectares). Penelitian ini bertujuan untuk mengetahui luas kawasan hijau dan jumlah emisi karbondioksida  yang mampu diserap oleh vegetasi serta untuk mengetahui kesesuaian tata ruang kawasan hijau Kota Palangka Raya dengan kebutuhan ruang terbuka hijau Kota Palangka Raya. Penelitian berupa deskripsi tentang keadaan lingkungan di Kota Palangka Raya yang berkaitan dengan jumlah emisi karbondioksida dan luas lahan bervegetasi. Hasil penelitian menunjukkan bahwa berdasarkan analisis tutupan lahan dan serapan karbondioksida, diketahui luas lahan bervegetasi di Kota Palangka Raya adalah 219.498,7 ha dan masih mampu menyerap seluruh emisi karbondioksida sejumlah 387.366,248 ton yang berasal dari konsumsi energi dan respirasi penduduk Kota Palangka Raya. Berdasarkan luas wilayah, kawasan perkotaan Kota Palangka Raya memerlukan RTH seluas 14.096,1 ha, berdasarkan jumlah penduduk diperlukan 581,84 ha RTH yang berupa taman kota, hutan kota, jalur hijau jalan, sempadan sungai dan pemakaman, berdasarkan kesetaraan penggunaan air diperlukan 323,75 ha RTH dan berdasarkan emisi karbondioksida diperlukan 3.331,38 ha RTH. Berdasarkan kesesuaian rencana tata ruang hijau kawasan perkotaan Kota Palangka Raya, diperoleh adanya kekurangan RTH. Kecamatan Pahandut kekurangan RTH berdasarkan luas wilayah (-3.513,23 ha), jumlah penduduk (-244,85 ha), kebutuhan air (-142,45 ha) dan emisi karbondioksida (-2.368,88 ha), sedangkan Kecamatan Jekan Raya kekurangan RTH berdasarkan luas wilayah (-8.936,96 ha) dan emisi karbondioksida (-2.849,04 ha).
CALENDAR VARIATION MODEL FOR FORECASTING TIME SERIES DATA WITH ISLAMIC CALENDAR EFFECT Suhartono, Suhartono
Jurnal Matematika Sains dan Teknologi Vol 7 No 2 (2006)
Publisher : LPPM Universitas Terbuka

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The aim of this paper is to develop a statistical model for explaining and forecasting the time series that contains Islamic Calendar effect. In time series literature, calendar variation is defined as a periodic and recurrent pattern with variation length period that usually caused by cultures and religions of people in a certain area. In Indonesia, the effect of the Eids holiday in many daily activities, such as transportation, inflation and consumption, is one example of calendar variations. This holiday happens on different month after three years or shift to previous month after at the same month on three years. This paper evaluates the disadvantage of seasonal classical time series model, such as Winter’s, Decomposition and ARIMA models, and develops a Calendar Variation model for forecasting time series that contain Islamic Calendar Effect. In this research, a real data about monthly sales of sardines are used as a case study. The results show that classical time series models, such as Winter’s, Decomposition and ARIMA models, cannot describe the calendar variation effect and yield invalid and unreliable forecast, particularly at the time (month) when the calendar variation happens. On the contrary, Calendar Variation model is a model that can explain precisely the impact of the calendar variation effect and gives valid and reliable forecasts.  
PENDUGAAN POTENSI SUMBERDAYA PERIKANAN LAUT DAN TINGKAT KERAGAAN EKONOMI PENANGKAPAN IKAN (KASUS DI TPI SENDANG BIRU KABUPATEN MALANG) Hulaifi, Hulaifi
Jurnal Matematika Sains dan Teknologi Vol 12 No 2 (2011)
Publisher : LPPM Universitas Terbuka

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The Increased fishing intensity will provide positive and negative impacts. Positive impact is an increase in production that can provide benefits, while the negative impact is eventually decline in production catches. The purpose of this research is potential of Estimating Maximum Sustainable Yield (MSY) in Malang Regency could still be maintained. MSY at the level of Maximum Economic Yield (MEY). Optimization of fishing effort and analysis economic eligibility fishing effort. The method of research using the survey method, Analysis of the data used is static Bio-economic model, and Gorden-Schaefer model. While the research results obtained MEY value of 5,789,952. kg/year and the actual conditions, a production of 5,221,781 kg/year and MSY of 5,829,206 kg/year, the rate of 90% utilization optimization, and optimal fishing levels have exceeded MSY. The advantage of fishermen in biology and economics as much as 5,789,952 kg/year. Conclusion The results showed that the water condition in Malang Regency was not economically efficient, because already there is excess fishing effort. Optimization needs to be done by limiting fishing effort, intensified fishing activities in deeper waters.
KONSISTENSI KOEFISIEN DETERMINASI SEBAGAI UKURAN KESESUAIAN MODEL PADA REGRESI ROBUST THE CONSISTENCY OF COEFFICIENT OF DETERMINATION TO FITTING MODEL THROUGH ROBUST REGRESSION Harmi Sugiarti; Andi Megawarni
Jurnal Matematika Sains dan Teknologi Vol. 13 No. 2 (2012)
Publisher : LPPM Universitas Terbuka

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In statistics, the coefficient of determination can be used to assess the suitability of a model with the data. If there are outliers in the data, the coefficient of determination obtained by the OLS method is not consistent. The purpose of this study was to compare the coefficient of determination of regression lines obtained by the OLS, the M and the LMS methods as a measure of the suitability model. The result showed that when the data contains no-outlier, the LMS method is as consistent as the OLS and the M methods concerning the coefficient of determinations. When the data contain outliers, the LMS method is more consistent than the OLS and the M methods. This result was based on real data with 9.1% outliers. Dalam statistik, koefisien determinasi dapat digunakan untuk menilai kesesuaian model dengan data. Jika ada outlier pada data, koefisien determinasi yang diperoleh dengan metode OLS tidak konsisten. Tujuan dari penelitian ini adalah untuk membandingkan koefisien determinasi dari garis regresi yang diperoleh melalui metode OLS, M dan metode LMS sebagai ukuran model kesesuaian. Hasil penelitian menunjukkan bahwa ketika data tidak mengandung-outlier, metode LMS adalah konsisten, serupa dengan metode OLS dan metode M terkait dengan koefisien determinasi. Ketika data mengandung outlier, metode LMS lebih konsisten daripada metode OLS dan metode M. Hasil ini berdasarkan ujicoba pada data nyata dengan outlier 9,1%.
PENGARUH PENGEMASAN DAN PELABELAN PADA PENERIMAAN MI KERING BERBAHAN BAKU TEPUNG KOMPOSIT UBIJALAR DAN KELADI Anggraeni Elisabeth, Dian Adi
Jurnal Matematika Sains dan Teknologi Vol 18 No 2 (2017)
Publisher : LPPM Universitas Terbuka

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Introduction of sweet potato and taro composite flours-based dried noodle productionwas conducted in Pelaga, Badung, Bali since 2013. Initial analysis found that dried noodle made from 70% wheat flour and 30% composite flours (80% taro flour and 20% sweet potato flour) was preferedbyrespondents. Minimum selling price for a pack of 200 grams was IDR 8,124.81, with R/C ratio was 1.30. The product packaged with special design and set with the brand name of ‘Labi Mie’ then was introduced to consumers in order to determine their acceptanceto the product. The study involved 32 respondents. Data was collected from semi-open questionnaires then analysed with a simply descriptive qualitative. Consumers stated that the information of expired date and net weight (75.00%) as well as nutrition fact (34.38%) were unclear. Then 68.75% consumers had no intention to buy the product with the reason of high price (50.00%) and unattractive(27.27%). The price of IDR 8,500 was considered too expensive by consumers. It should be less or equal to IDR 8,000.00 (87.50%). Only 6.25% consumers answered that reasonable price could be higher than minimum selling price. It should be admitted that these study results were still far from the expectation. However, it is a valuable input for farmers in developing their product in market. Introduksi produksi mi kering berbahan baku tepung komposit ubijalar dan keladi dilaksanakan di Pelaga, Badung, Bali sejak 2013. Hasil penelitian pendahuluan menunjukkan bahwa mi kering yang dibuat dari 70% tepung terigu dan 30% tepung komposit dengan perbandingan 80% tepung keladi dan 20% tepung ubijalar disukai oleh panelis. Harga jual minimum untuk mi kering kemasan 200 gram adalah Rp 8.124,81 dengan R/C rasio 1,30. Produk mi dikemas dengan desain khusus dan diberi label nama “Labi Mie” kemudian diperkenalkan kepada konsumen untuk mengetahui tingkat penerimaan mereka terhadap produk. Studi melibatkan 32 orang responden. Data dikumpulkan melalui kuesioner semi-terbuka, kemudian dianalisis secara deskriptif kualitatif sederhana. Konsumen menyatakan bahwa informasi tanggal kadaluwarsa danberat bersih produk tidak jelas (75+,00%), demikian juga daftar kandungan gizi (34,38+%). Sebanyak 68,75+ % konsumen menyatakan tidak berminat membeli produk karena alasan harga mahal (50,00%) dan produk tidak menarik (27,27 +%). Harga jual sebesar Rp 8.500 per kemasan 200 gram dinilai konsumen terlalu mahal. Harga jual seharusnya kurang atau sama dengan Rp 8.000 (87,50+%). Hanya 6,25+% konsumen yang menjawab bahwa harga yang pantas untuk produk adalah lebih tinggi dari harga jual minimum. Harus diakui bahwa hasil studi masih jauh dari perkiraan; namun hal tersebut dapat menjadi masukan bagi petani dalam mengembangkan produknya di pasaran.
TINGKAT PARTISIPASI PEREMPUAN PENGOLAH IKAN DALAM KELOMPOK USAHA BERSAMA DI CISOLOK, SUKABUMI Yuliana, Ernik; Farida, Idha; Kusumawati, Enny
Jurnal Matematika Sains dan Teknologi Vol 9 No 1 (2008)
Publisher : LPPM Universitas Terbuka

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Traditional fish processing industries in Cisolok Sukabumi is operated mainly by women organized in Kelompok Usaha Bersama (KUB). This study is aimed to explain the influence of women characteristics on their participatory level in KUB activities exploratory research design with survey method were used to collect data. Sample populations of this study were all fisherwomen who process fish product in KUB. Forty samples were chosen with random sampling and datacollected were analysed by using structural equation model (SEM). The results show that participation level of fisherwomen in KUB is still low. Fisherwomen characteristics have no significant influence to participation level in KUB activities. Structural model obtained is not fit between hypothetic model and sample data. Therefore the model can not be applied in the field. But at the other hand, KUB have to intensify means to give the skill extension for fisherwomen so that participatory rate will increase.
SINTESIS BAHAN UBAHAN GRADUAL ALUMINUM TITANAT/KORUNDUM DARI ALUMINA TRANSISI DENGAN PENAMBAHAN MgO Achmad Sulhan Fauzi; Suminar Pratapa; Mohammad Herman Eko Santoso
Jurnal Matematika Sains dan Teknologi Vol. 13 No. 2 (2012)
Publisher : LPPM Universitas Terbuka

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33830/jmst.v13i2.508.2012

Abstract

This article describes the results of research on the use of transition alumina for improving the performance of ceramics. Synthesis has been made of gradual changes materials (Functionally Graded Materials, FGM) aluminum titanate (AT) / corundum based on transition alumina powders with the addition of MgO as a stabilizer of AT as much as 2 wt.%. Samples without the addition of MgO was also made for comparison. Transition alumina with and without the addition of MgO were calcined at a temperature of 1100C for 1 hour to become ?-alumina. The powder mixture was compacted at a pressure of 49.3 MPa and then prasintered at a temperature of 1100C for 1 hour, then repeatedly infiltrated with infiltrator TiCl3 solution (20%) which prepared by dissolving the Ti metal powders into HCl. Furthermore, the material sintered at temperatures of 1500C with a holding time for 3 hours. Physical character of materials showed an increase in density and decrease in porosity of the material due to the addition of MgO. Phase identification results obtained from the content of AT and corundum phases which gradual in depth, indicating that FGM has been formed. These results were supported by analysis of x-ray diffraction pattern showing the formation of a solid solution Al2 (1-x) + MgxTi1 xO5 which marked by the shifting of the peak of AT phase in FGM samples with the addition of MgO. Tulisan ini menjelaskan hasil penelitian tentang penggunaan alumina transisi untuk meningkatkan performa keramik. Telah dilakukan sintesis bahan ubahan gradual (Functionally Graded Material, FGM) aluminum titanat (AT)/korundum berbahan dasar serbuk alumina transisi dengan penambahan MgO sebagai penstabil AT sebanyak 2 wt.%. Sampel tanpa tambahan MgO juga dibuat sebagai pembanding. Alumina transisi dengan dan tanpa penambahan MgO dikalsinasi pada temperatur 1100C selama 1 jam sehingga menjadi ?-alumina. Serbuk campuran dikompaksi pada tekanan 49,3 MPa lalu diprasinter pada temperatur 1100C selama 1 jam, kemudian diinfiltrasi secara berulang dengan infiltran larutan TiCl3 (20%) yang dibuat dengan cara melarutkan serbuk logam Ti ke dalam HCl. Selanjutnya bahan disinter pada temperatur 1500C dengan holding time selama 3 jam. Karakterisasi fisik bahan memperlihatkan adanya kenaikan densitas dan penurunan porositas bahan akibat penambahan MgO. Dari hasil identifikasi fasa didapatkan kandungan fasa AT dan korundum yang gradual terhadap kedalaman, menunjukkan bahwa FGM telah terbentuk. Hasil ini didukung dengan analisis pada pola difraksi sinar-x yang memperlihatkan terbentuknya larutan padat Al2(1-x)MgxTi1+xO5 yang ditandai terjadinya pergeseran puncak fasa AT pada sampel FGM dengan penambahan MgO.

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