Diophantine Journal of Mathematics and Its Applications最新文献

Kajian Matematis Mengenai Strategi Pengembangbiakan Sapi Potong Lokal Guna Meningkatkan Kualitas Daging Sapi 关于当地肉牛饲养策略的数学研究，以提高牛肉的质量

Diophantine Journal of Mathematics and Its Applications Pub Date : 2023-06-30 DOI: 10.33369/diophantine.v2i01.27771

Zaki Maulana Hidayat, Andzar Tsaqif Laksana, Anita Triska

{"title":"Kajian Matematis Mengenai Strategi Pengembangbiakan Sapi Potong Lokal Guna Meningkatkan Kualitas Daging Sapi","authors":"Zaki Maulana Hidayat, Andzar Tsaqif Laksana, Anita Triska","doi":"10.33369/diophantine.v2i01.27771","DOIUrl":"https://doi.org/10.33369/diophantine.v2i01.27771","url":null,"abstract":"Beef is one of the most demanded food products in Indonesia compared to other meat commodities. The high demand of this commodity causes a shortage of its supply so that the government has to import it from other countries. As the consequences, people in Indonesia prefer to consume imported beef rather than local beef, especially those in the food industry, since imported beef has better quality. Thus, government may establish a program that is able to increase the local beef quality thereby increasing its competitiveness, for instant by cross-breeding of local and imported cattle. This paper is to discuss a cross-breeding simulation to predict the distribution of offspring produced in the next few generations through mathematical approach. Simulations are conducted by following the X-Linked Inheritance concept and algebra. Simulations are carried out by three different scenarios which consider gender of the imported cattle. The simulations show that all scenarios are able to produce local cattle offspring with imported quality. However, the offspring from the cross-breeding still preserve cattle with original local genetic with a different ratio between the first and the second scenario.","PeriodicalId":330009,"journal":{"name":"Diophantine Journal of Mathematics and Its Applications","volume":"104 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120872461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analisis Manajemen Pengelolaan Pohon Gmelina arborea Roxb. pada Hutan Rakyat di Tasikmalaya dan Banjar, Jawa Barat 分析树Gmelina arborea Roxb的管理管理。在西爪哇省塔斯克马来亚和班贾尔的民间森林

Diophantine Journal of Mathematics and Its Applications Pub Date : 2023-06-30 DOI: 10.33369/diophantine.v2i01.27772

Siti Aizal Yasni Ellena, Lidia H. Y. A. Rudamaga, Anita Triska

{"title":"Analisis Manajemen Pengelolaan Pohon Gmelina arborea Roxb. pada Hutan Rakyat di Tasikmalaya dan Banjar, Jawa Barat","authors":"Siti Aizal Yasni Ellena, Lidia H. Y. A. Rudamaga, Anita Triska","doi":"10.33369/diophantine.v2i01.27772","DOIUrl":"https://doi.org/10.33369/diophantine.v2i01.27772","url":null,"abstract":"\u0000 \u0000 \u0000 \u0000Forests are natural resources which if it is managed properly can provide the economic benefits to the surrounding. Woods from trees in the forest are one of the economic benefits that can be gained from the forest. However, trees must be logged under a precise calculation and controlled continuously so that they are not extinct. Logging time in a forest is generally determined by the needs of farmers, which may not necessarily provide maximum benefits. Therefore, harvesting management is needed to obtain optimal benefits while still maintaining the forest sustainability. This paper discusses a basic model of the tree harvesting using Linear Algebra which is applied to one of economically valuable trees, i.e., Gmelina arborea Roxb. on the community forest in Tasikmalaya and Banjar, West Java. Initially, the tree population is divided into 16 class intervals based on their diameter. Analysis of the harvesting model implies that the optimal results will be obtained by logging all of trees in one class with the highest selling value. By applying this scenario, all of the Gmelina arborea Roxb. on the community forest in Tasikmalaya and Banjar, West Java must be logged at the 9th class which will provide a maximum profit of IDR 12,491,843.889 for every 1,000 trees harvested. \u0000 \u0000 \u0000 \u0000","PeriodicalId":330009,"journal":{"name":"Diophantine Journal of Mathematics and Its Applications","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125356119","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

IMPLEMENTASI ALGORITMA GREEDY PADA PEWARNAAN WILAYAH PETA KECAMATAN GELUMBANG MUARA ENIM

Diophantine Journal of Mathematics and Its Applications Pub Date : 2023-06-30 DOI: 10.33369/diophantine.v2i01.28347

Khuzaimah Al Jufri, Riza Agustiani

引用次数: 0

Klasifikasi Kualitas Air Minum menggunakan Penerapan Algoritma Machine Learning dengan Pendekatan Supervised Learning 利用应用算法学习机器的方法对饮用水的质量进行分类

Diophantine Journal of Mathematics and Its Applications Pub Date : 2023-06-30 DOI: 10.33369/diophantine.v2i01.28260

Lidya Savitri, Rahmat Nursalim

引用次数: 0

PERFORMA TEKNIK REGULARISASI DALAM PENANGANAN MASALAH MULTIKOLINIERITAS 多科林主义问题处理中重组技术的作用

Diophantine Journal of Mathematics and Its Applications Pub Date : 2023-06-30 DOI: 10.33369/diophantine.v2i01.28480

Alin Febianti Fikri, Winalia Agwil, Dian Agustina

{"title":"PERFORMA TEKNIK REGULARISASI DALAM PENANGANAN MASALAH MULTIKOLINIERITAS","authors":"Alin Febianti Fikri, Winalia Agwil, Dian Agustina","doi":"10.33369/diophantine.v2i01.28480","DOIUrl":"https://doi.org/10.33369/diophantine.v2i01.28480","url":null,"abstract":"Multikolinieritas adalah kondisi terdapat hubungan linier antar variabel independen, dimana diantara variabel independen tersebut saling berkorelasi. Akibatnya akan sulit untuk melihat pengaruh variabel independen terhadap variabel dependen. Penanganan multikolinieritas salah satunya dapat dilakukan menggunakan teknik regularisasi yaitu bentuk regresi yang mengatur atau menyusutkan perkiraan koefisien menuju nol. Teknik regularisasi yang akan dibahas pada penelitian adalah regresi ridge, LASSO dan elastic net. Regresi ridge hanya dapat menyusutkan koefisien regresi menuju angka 0, tetapi tidak pernah tepat ke angka 0. Regresi elastic net dapat menyusutkan koefisien regresi tepat nol, melakukan seleksi variabel secara simultan dan dapat memilih kelompok peubah yang berkorelasi. Sedangkan, regresi LASSO hanya dapat menyusutkan koefisien dan menetapkan koefisien ke angka 0. Oleh karena itu, LASSO dapat menghasilkan model dengan variabel terbaik. Namun, LASSO memiliki beberapa kelemahan. Ketika jumlah variabel independent lebih kecil dibanding jumlah amatan, kinerja LASSO lebih didominasi oleh ridge. Ketika jumlah variabel independent lebih besar dibanding jumlah amatan, maka LASSO hanya memilih n variabel yang diikutkan dalam model. Sehingga, untuk mengatasi high dimensional data yang mengandung multikolinieritas dilakukan penelitian menggunakan teknik regularisasi regresi ridge, LASSO dan elastic net untuk dibandingkan kebaikan modelnya berdasarkan nilai MSE terkecil. Data yang digunakan merupakan data simulasi dan studi kasus dari website resmi BPS serta UCI machine learning repository. Disimpulkan bahwa dari 30 pengacakan, model ridge baik memodelkan dataset dengan p = 20, 40, dan 80 atau kondisi dataset dimana jumlah variabel independent lebih kecil dibanding jumlah amatan dan elastic net baik memodelkan dataset dengan p = 100, 160, dan320.","PeriodicalId":330009,"journal":{"name":"Diophantine Journal of Mathematics and Its Applications","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126992858","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analisis Persediaan Bahan Baku Multi Item Usaha Kerupuk Kulit Alhamdulillah Menggunakan Metode Economic Order Quantity 使用经济订单统计方法对多种产品的原料供应进行分析

Diophantine Journal of Mathematics and Its Applications Pub Date : 2023-06-30 DOI: 10.33369/diophantine.v2i01.28208

Vebby Afifah Cahyani Cahyani, Yusmet Rizal

引用次数: 0

Peramalan Jumlah Penumpang LRT Sumsel dengan Metode Exponential Smoothing

Diophantine Journal of Mathematics and Its Applications Pub Date : 2023-01-04 DOI: 10.33369/diophantine.v1i1.23994

Riski Rahmatul Lailiyah, Riza Agustiani

{"title":"Peramalan Jumlah Penumpang LRT Sumsel dengan Metode Exponential Smoothing","authors":"Riski Rahmatul Lailiyah, Riza Agustiani","doi":"10.33369/diophantine.v1i1.23994","DOIUrl":"https://doi.org/10.33369/diophantine.v1i1.23994","url":null,"abstract":"Forecasting is critical in the pandemic sector as part of the effort to adapt the post-pandemic system, particularly in transportation. This research carried out on the South Sumatra Integrated Railroad (LRT) in the post-pandemic Covid-19 period. Forecasting is done in this study using the exponential smoothing method using alpha that is α=0.1, α=0.5, and α= 0.9. Comparison with the smallest error using the exponential smoothing method dropped the choice at alpha 0.1 with the smallest error calculation value. Forecasting using the exponential smoothing method with 0.1 alpha sample data on the number of LRT Sumsel passengers during the Covid-19 period in 2020 produces a forecast of 66,538 passengers with an error rate of Mean Absolute Deviation (MAD)=9,486, Mean Square Error (MSE)=1,150, and Mean Absolute Percentage Error (MAPE)=24.58%. Meanwhile, from the sampel data on the number of South Sumatra LRT passengers on post-pandemic Covid-19 period in 2022, it produced a forecast of 187,566 passengers with Mean Absolute Deviation (MAD) = 25,816, Mean Square Error (MSE) = 9,477, and Mean Absolute Percentage Error (MAPE) = 16.60%.","PeriodicalId":330009,"journal":{"name":"Diophantine Journal of Mathematics and Its Applications","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128016650","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Komparasi Penggunaan Matriks Kebalikan Leontief & Ghosian Untuk Peramalan Dalam Model Input Output

Diophantine Journal of Mathematics and Its Applications Pub Date : 2022-12-31 DOI: 10.33369/diophantine.v1i1.25703

Budi Kurniawan, Susiawati Kristiarini

{"title":"Komparasi Penggunaan Matriks Kebalikan Leontief & Ghosian Untuk Peramalan Dalam Model Input Output","authors":"Budi Kurniawan, Susiawati Kristiarini","doi":"10.33369/diophantine.v1i1.25703","DOIUrl":"https://doi.org/10.33369/diophantine.v1i1.25703","url":null,"abstract":"This study is an empirical study that compares the use of two types of inverse matrices in the input output model. The Input Output (IO) model is based on a system of mathematical equations that applies general equilibrium phenomena. The matrix operating system in the equation derived from the IO model allows the Output value (X) to be calculated as an effect of the final demand induction (F) with the formulation X=(I-A)-1F where A is the technical coefficient matrix. This equation model uses the Leontief Inverse Matrix to calculate the impact of output with final demand (F) as a stimulant. Calculation of the impact of the stimulus from the supply side such as added value and the value of intermediate inputs originating from imports (V) uses the Ghosian Inverse Matrix in the equation X=(I-AT)-1V where AT is the usage coefficient matrix. The data used in this study comes from the Bengkulu Province Input Output Tables in 2000 and 2016, each of which has been collected in a common set to see comparability between years of observation. Forecasting results with both types of approaches produce different levels of accuracy for each observation period.","PeriodicalId":330009,"journal":{"name":"Diophantine Journal of Mathematics and Its Applications","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124085364","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Penerapan Support Vector Machine Dalam Peramalan Nilai Tukar Petani Provinsi Bengkulu

Diophantine Journal of Mathematics and Its Applications Pub Date : 2022-12-31 DOI: 10.33369/diophantine.v1i1.25793

Yosep Oktavianus Sitohang

引用次数: 0

Kondisi Tenaga Kerja Di Provinsi Bengkulu Di Tengah Pandemi Covid-19 班古鲁省的劳动力状况发生了Covid-19大流行

Diophantine Journal of Mathematics and Its Applications Pub Date : 2022-12-31 DOI: 10.33369/diophantine.v1i1.25854

Nani Sumarni

{"title":"Kondisi Tenaga Kerja Di Provinsi Bengkulu Di Tengah Pandemi Covid-19","authors":"Nani Sumarni","doi":"10.33369/diophantine.v1i1.25854","DOIUrl":"https://doi.org/10.33369/diophantine.v1i1.25854","url":null,"abstract":"One of which its impact the Covid-19 is job availability. This study aims to analyze the unemployment rate in Bengkulu Province, especially during the Covid-19 pandemic. This research is quantitative with a descriptive statistical approach. The data source used is secondary data from the Central Bureau Statistics for 2017-2020. The results of this study state that the Covid-19 pandemic has an influence in a decrease in the number of businesses by 0,86 percent. Two sectors, which are trade and agriculture sectors, became the people's main choice to survive during the pandemic, compared to the industrial sector which has been most significantly affected by the pandemic. In line with that, the population working as family workers/unpaid workers increased to 3,71 percent. The results of the analysis of the data for the last four years show that in terms of education completed, the employment is still dominated by people with low education, that reached 78,27 percent. However, among the three graduates, high school graduates are the most not being absorbed in the world of work. Meanwhile, the number of unemployed people with diploma education has actually decreased.","PeriodicalId":330009,"journal":{"name":"Diophantine Journal of Mathematics and Its Applications","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123626835","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0