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INDONESIA
SAINS DAN MATEMATIKA
Published by Universitas Diponegoro
ISSN : -     EISSN : -     DOI : -
Core Subject : Education,
Mathematics
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Articles 169 Documents
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Studi Uniformitas Dosis Radiasi CT Scan pada Fantom Kepala yang Terletak pada Sandaran Kepala Retnoningsih, Dwi Siwi; Anam, Choirul; Setiabudi, Wahyu
JURNAL SAINS DAN MATEMATIKA Volume 20 Issue 2 Year 2012
Publisher : JURNAL SAINS DAN MATEMATIKA

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Abstract

The research on the impact of tube current and  tube voltage  on uniformity of the point dose in the head phantom was placed on the table, had been conducted. The research was carried out on the CT Scan machine, Siemens Somatom Emotion 6. The detector used was CT dose profiler and Piranha Electrometer 556. The phantom was head phantom with PMAA material with diameter 16 cm and length 15 cm. The measurement of point dose carried out by using axial mode. The measurement conducted in five points inside the head phantom. In this research, the tube current and tube voltage were varied. The results show that the point dose on the head phantom was placed on the table is non-uniform. At the bottom of the phantom, the dose is lower to below 50% than at the top of the phantom.   Keywords: CT Scan, Dose uniformity, Point Dose, CTDI
PERUBAHAN STRUKTUR DAN KEPADATAN TRIKOMATA NON GLANDULER SERTA LUAS DAUN KAKAO (Theobroma cacao L.) PADA PERLAKUAN STRES KEKURANGAN AIR Prihastanti, Erma; T, Soekisman; Soepandi, Didie; Qayim, Ibnul
JURNAL SAINS DAN MATEMATIKA Volume 17 Issue 1 Year 2009
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Abstract

ABSTRACT--Cacao  is the one  important  crop in Indonesia. Water  stress  is perhaps  the major factor  limiting  crop growth. Plant responses to water stress  include morphological of biochemical changes. This reserch was aimed studying  strtructure and density of non glanduler  trichomes, and leaf area on cacao leaves on drought experiment.  The drought studies used throughfall displacment experiment  (TDE). The result show that cacao leaves have non glanduler trichomes type stellat. Non Glanduler trichomes were distributed throughtout the vein of leaves with distribution in abaxial parts of the leaves. TDE give non significant effect to trichomes density and Ieaf area. The highest trichomes  happened  on March 2008  6.9861/cm2. Leaf area on shade Ieaves  (273,56 cm2) more higher than sun leaves  (235,50 cm2). Keyword : Trichomes  non  glanduler, cacao leaves, leaf area
Students Major Determination Decision Support Systems using Profile Matching Method with SMS Gateway Implementation Sopianti, Lilis; Bahtiar, Nurdin
JURNAL SAINS DAN MATEMATIKA Volume 23 Issue 1 Year 2015
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Abstract

In the implementation of curriculum 2013 at high school level, the majoring for students was started from the level of class 10. The available major options are Math and Natural Sciences (MIA), Social Sciences (IIS), and Linguistics and Cultures (IBB). The process of determining the major was conducted by the counseling teacher through a careful selection based on several criteria including grades, graduation test scores, record of accomplishment, student's selected major, and psychological test results. During the process of determining the major, the school often has to deal with several constraints associated with the standard acceptance rules from each major department. To deal with these constraints and minimize the occurrence of human errors, it needs a Decision Support System to carry out the process. In this study, the system is made to apply the Profile Matching method. Profile Matching method calculated the competence of each individual based on given criteria. The implementation of Profile Matching method is optimized by placing core and secondary factor dynamically on each majoring department in order to obtain an ideal results from the majoring selection process. In order to provide added value to the system, an SMS Gateway feature has been installed to help broadcasting the majoring selection results to the participating students.
Learning Vector Quantization Pada Pengenalan Pola Tandatangan Prabowo, Anindito; Sarwoko, Eko Adi; Riyanto, Djalal Er
JURNAL SAINS DAN MATEMATIKA Volume 14 issue 4 Year 2006
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Abstract

ABSTRAK---Pengenalan pola tandatangan dimaksudkan agar komputer dapat mengenali tandatangan dengan cara mengkonversi gambar, baik yang dicetak ataupun ditulis tangan ke dalam kode. Metode yang dipilih dalam pengenalan pola tandatangan ini adalah metode pembelajaran Kohonen Neural Network(Kohonen) dan Learning Vector Quantization(LVQ). Metode Kohonen mengambil bobot awal secara acak, kemudian bobot tersebut di-update hingga dapat mengklasifikasikan diri sejumlah kelas yang diinginkan. Pada metode LVQ bobot awal di-update dengan menggunakan pola yang sudah ada. Dalam penelitian ini, diberikan hasil pengamatan dan perbandingan tentang tingkat keakuratan dan waktu yang dibutuhkan dalam proses pembelajaran terhadap pola tandatangan pada metode Kohonen dan LVQ menggunakan bahasa pemrograman Microsoft Visual Basic 6.0 Enterprise Edition.Kata kunci: metode Kohonen, neural network, metode Learning Vector Quantization
Respon Pertumbuhan dan Produksi Senyawa Antioksidan pada Kalus Hibiscus sabdariffa L. dari Eksplan yang Berbeda secara in vitro Noviati, Agustin; Nurchayati, Yulita; Setiari, Nintya
JURNAL SAINS DAN MATEMATIKA Volume 22 Issue 1 Year 2014
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Abstract

Ascorbic acid and carotenoid are secondary metabolites found in roselle, which show antioxidant activity. These compounds can be obtained from callus induced  by several kinds of explants. The aims of this experiment is to study callus growth from explants which can encourage high level of antioxidant compounds. The callus was obtained from difference organ, i.e. section of leaf, petiole and flower sepal. Sterilized explants were planted in MS (Murashige&Skoog) combined with 2 mg/L Naphtalene Acetic Acid (NAA) dan 5 mg/L Benzyl Adenin (BA).  This experiment has been conducted by completly randomized design with 5 replicates. Besides fresh weight callus, callus respons from each explants were analyzed descrptively.  Ascorbic acid and carotenoid content were analyzed qualitatively and quantitatively by titration and spectrophotometric respectively.  The results showed that all kinds of explant dedifferentiated into callus which antioxidant content. Callus from leaf section had the higgest fresh weight with high level ascorbic acid. Whereas the higgest carotenoid level was obtained from callus-derived flower sepals. It conclused that  in vitro callus was useful for producing plant biochemical compounds. Keywords : Callus induction, antioxidant agents, explants, ascorbic acid, cartenoid
Metode Optimasi Portofolio Saham Syariah Menggunakan Nonlinear Programming Pada Pasar Modal Syariah di Indonesia Mussafi, Noor Saif Muhammad
JURNAL SAINS DAN MATEMATIKA Volume 22 Issue 2 Year 2014
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Abstract

Penelitian ini berusaha untuk mengetahui dan menganalisis pengembangan metode optimasi saham syariah menggunakan kaidah Nonlinier Programming dalam rangka memberikan alternatif portofolio optimal yang dapat dijadikan sebagai referensi dalam meningkatkan kualitas pasar modal syariah di Indonesia.  Data dalam penelitian ini adalah informasi harga saham syariah pada Jakarta Islamic Index (JII) periode Januari 2011-Januari 2013 yang dianalisis menggunakan teori-teori matematika keuangan dan dikembangkan menggunakan quadratic programming. Hasil penelitian ini adalah rumusan langkah sistematis dalam memaksimalkan tingkat keuntungan dan meminimalkan tingkat risiko investasi saham syariah serta penentuan  proporsi dana yang dapat diinvestasikan pada emiten terbaik yang terpilih.   Kata kunci: saham syariah,  quadratic proramming,  tingkat risiko dan tingkat keuntungan.  This study sought to determine and analyze the development of Islamic stock optimization method using Nonlinear Programming principles in order to provide alternative optimal portfolio can be used as a reference in improving the quality of Islamic capital market in Indonesia. The data in this study is the Islamic stock price incorporated in the Jakarta Islamic Index (JII) in the period Januari 2011-Januari 2013 are analyzed using mathematical theories in finance and quadratic programming. The results of this study is the formulation of a systematic step in maximizing return and minimizing investment risk of Syariah stocks and determining the proportion of funds that can be invested in the best companies choosen.   Keywords : syariah stock, quadratic programming , risk and return
Comparative Study of Characteristicsof Sediment and Water Qualityin Aquaculture Farming Systems Area with Coastal Area Adjacent to Industrial Activities Putro, Sapto Purnomo; Febria, Ibni Jeudi; Muhammad, Fuad
JURNAL SAINS DAN MATEMATIKA Volume 22 Issue 3 Year 2014
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Abstract

Disturbance of water environment due to organic enrichment caused by farming activities may result in the reduction of water quality and sediments. This study was conducted to determine the condition of the water and sediments in the area of aquaculture in ponds system compared to the adjacent coastal area of industrial activities. Water qualities observed were the temperature, DO, salinity, conductivity, turbidity and pH. Sediment characteristics measured were sediment grain size and organic matter content contained in the sediments. From the research, the temperature values obtained ranged 28.7-32.9°C, DO 3.63 to 6.4 mg/l, pH 4.31 to 6.27, salinity 4.6 to 33 ‰, conductivity 8.5- 50.2 ms/cm, turbidity 73-535 NTU. The substrate grain analysis showed at the fish farm area in pond systems was dominated by silt 71.70% and clay 16.71%. In the coastal area adjacent to the industrial activities, 93.38% substrate was dominated by sand. Analysis of organic matter content in the pond systems exhibited the highest ranged between 0.72% -1.16% for nitrogen and 3.20%-10.35% for carbon. The differences in the composition of the substrate and the organic material can be caused by hydrographic conditions, especially strong/weak water currents, the accumulation of litter originating from the decomposition of leaves of mangrove, enrichment of nutrients during the decomposition of litter and aquaculture activities and industries.
EKSISTENSI DAN KETUNGGALAN LAPANGAN HINGGA Suryoto, Suryoto
JURNAL SAINS DAN MATEMATIKA Volume 17 Issue 3 Year 2009
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Abstract

ABSTRAK--Lapangan merupakan salah satu bentuk gelanggang yang mempunyai sifat-sifat yang cukup menarik untuk dikaji, khususnya lapangan yang banyaknya unsur berhingga atau yang lebih dikenal dengan lapangan hingga. Yang menarik dari lapangan hingga adalah banyaknya unsur yang terkandung di dalamnya, yang ditentukan sepenuhnya oleh suatu bilangan prima yang merupakan Karakteristik lapangan tersebut. Pada makalah ini akan dikaji eksistensi dan ketunggalan lapangan hingga dengan order atau banyaknya unsur yang terkandung di dalamnya merupakan perpangkatan suatu bilangan prima yang merupakan karakreristiknya, melalui dua buah pendekatan, yaitu pendekatan melalui ruang vektor dan pendekatan dengan suku banyak.Kata kunci : Karakteristik, order, suku banyak monik tak-tereduksi, ruang vektor
Pengembangan Teknik Pengambilan Sampel Makrobenthos: Seleksi Alat dan Preparasi Putro, S.P
JURNAL SAINS DAN MATEMATIKA Volume 19 Issue 3 Year 2011
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Abstract

Makrobenthic animals are invertebrates that relatively small (at least 500 µ ) and have short life spans, and play an important role as secondary producers in the structure of the food chain in the water ecosystem. They inhabit substrates/sediment at the bottom of the water column, either at the surface (epifauna) or in the sediment (infauna). Therefore, it needs proper method of collecting these animals. The procedures that need to be considered when collecting samples of macrofauna marine animals are sampling techniques, the type and size of the sampling tool , mesh size , and methods of preservation and fixation . In carrying out a study to determine the level of environmental disturbance aquatic ecosystems , in addition to disturbed areas , we need to use the control or reference areas for comparison . This area is ideally a region relatively undisturbed by human activity or environmental disturbance is assumed not to occur. Areas that are ecologically potentially disturbed areas can be cultivated fish / shrimp ponds in coastal systems , aquaculture floating net cage systems in a river or lake, disposal area (outlet) of industrial waste , etc. . While the reference area/control can be in the coastal mangrove areas , water areas without any human activities, and upstream river that are at least 1 km away from the disturbed area.
Sistem Temu Kembali Informasi pada Dokumen Teks Menggunakan Metode Term Frequency Inverse Document Frequency (TF-IDF) Harjanto, Dhony Syafe’i; Endah, Sukmawati Nur; Bahtiar, Nurdin
JURNAL SAINS DAN MATEMATIKA Volume 20 Issue 3 Year 2012
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Abstract

Banyaknya informasi yang disimpan dalam dokumen teks mengakibatkan pengguna sistem informasi mengalami kesulitan untuk mendapatkan informasi yang diinginkan, maka diperlukan sebuah mesin pencarian yang dapat menentukan dan menemukan dokumen yang relavan sesuai dengan query pengguna. Penelitian ini menggunakan metode Term Frequency Inverse Document Frequency (TF-IDF) yang didasarkan pada kemunculan term pada tiap dokumen dan pengurangan dominasi term yang sering muncul di berbagai dokumen. Hasil Penelitian ini adalah program simulasi  Sistem Temu Kembali Informasi pada dokumen teks menggunakan Metode Term Frequency Inverse Document Frequency (TF-IDF) yang menghasilkan perhitungan pembobotan Term Frequency Inverse Document Frequency (TF-IDF) dan mendapatkan dokumen relevan yang teranking sesuai tingkat pembobotannya berdasarkan query masukan oleh pengguna.   Keywords: Mesin Pencarian, Query, Term Frequency, TF-IDF

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