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All Journal BAREKENG: Jurnal Ilmu Matematika dan Terapan Jambura Journal of Mathematics Jurnal Abdi Insani Euler : Jurnal Ilmiah Matematika, Sains dan Teknologi Fraction: Jurnal Teori dan Terapan Matematika Jurnal Riset Fisika Indonesia Dharma Pengabdian Perguruan Tinggi (DEPATI) Society
Desy Yuliana Dalimunthe, Desy Yuliana
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Agriculture, Biological Sciences & Forestry Arts Humanities Astronomy Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Engineering Environmental Science Health Professions Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences Transportation Other

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PREDICTION OF TIN EXPORTS, POPULATION, POVERTY, AND LABOR FORCE IN THE PROVINCE OF BANGKA BELITUNG ISLANDS Kustiawan, Elyas; Dalimunthe, Desy Yuliana; Vebtasvili, Vebtasvili; Oktarianty, Haslen; Silaban, Yabes Sentosa; Luthfiyah, Fadillah; Rahmania, Dita
BAREKENG: Jurnal Ilmu Matematika dan Terapan Vol 18 No 4 (2024): BAREKENG: Journal of Mathematics and Its Application
Publisher : PATTIMURA UNIVERSITY

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/barekengvol18iss4pp2589-2596

Abstract

The COVID-19 virus has also caused shocks to the Bangka Belitung Islands Province in various sectors, especially the economy. To overcome this problem, of course the government has prepared responsive policies, both fiscal and monetary policies to prevent post-COVID-19 risks, especially in the economic recession. To prevent a post-COVID-19 economic recession, a prediction or time series forecast is needed on four variables that influence the economic recession, namely the number of tin exports, population, poverty and labor force in the Bangka Belitung Islands Province so that economic growth is maintained. This research aims to predict the four research variables by comparing the Moving Average and Exponential Smoothing methods. This research also uses Root Mean Square Error (RMSE), Mean Absolute Error (MAE), and Mean Absolute Percentage Error (MAPE) as indicators of model accuracy. Based on the results of the accuracy indicators of this model, it was found that the Exponential Smoothing method was better than the Moving Average method. The predicted results for the value of tin exports in 2024 are -3.3645811 with The RMSE value is 42293770, MAE is 29558091, and MAPE is 84.46131. The negative value in the tin export prediction means that the decline in the value of tin exports in 2024 will not have a significant effect because it is still within a reasonable figure. The total labor force in 2024 will be 11057.23 with RMSE value is 16536.48, MAE value is 14194.02, and MAPE is 112.8078. Then for population the predicted result is 21241.92 with RMSE is 19537.82, MAE is 11548.41, and MAPE is 37.51894. Then for the predicted results the number of poverty is 70.22749 with RMSE, MAE, and MAPE respectively of 3992.146, 3205.528, and 139.1129. The alpha value used is 0.0183.
VOLATILITY ANALYSIS AND INFLATION PREDICTION IN PANGKALPINANG USING ARCH GARCH MODEL Dalimunthe, Desy Yuliana; Kustiawan, Elyas; -, Khadijah; Halim, Niken; Suhendra, Helen
BAREKENG: Jurnal Ilmu Matematika dan Terapan Vol 19 No 1 (2025): BAREKENG: Journal of Mathematics and Its Application
Publisher : PATTIMURA UNIVERSITY

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/barekengvol19iss1pp237-244

Abstract

One of the concerns of both developed and developing countries, as well as in a region, is the amount of inflation that occurs. Inflation is a serious problem. Inflation is a macroeconomic variable that affects people's welfare and is defined as a complex phenomenon resulting from general and continuous price increases. This research aims to analyze the volatility and projected value of the inflation rate, especially in Pangkalpinang City, using the Autoregressive Conditional Heteroskedasticity (ARCH) and Generalized Autoregressive Conditional Heteroskedasticity (GARCH) models. This research uses time series data on inflation rate of Pangkalpinang, Bangka Belitung Island Province from January 2014 to May 2024. This data was obtained through publications from the Central Statistics Agency of Bangka Beliltung Islands Province. The ARCH model is used to handle heteroscedasticity in data, while the GARCH model is a development of the ARCH model and serves as a generalization of the volatility model. This research shows that the predicted inflation rate in Pangkalpinang City from June 2024 to November 2024 tends to decrease with a MAPE prediction accuracy level of 200.04%. The high MAPE value is caused by actual data moving toward 0.
Implementasi Artificial Neural Network (ANN) dalam Memprediksi Nilai Tukar Rupiah terhadap Dolar Amerika Sakti, Adam Indra; Saputra, Lianda; Suhendra, Helen; Halim, Nikken; Alviari, Irfaliani; Ilham, Muhammad Rozan Nur; Putri, Marwah Hotimah Nada; Dalimunthe, Desy Yuliana
Euler : Jurnal Ilmiah Matematika, Sains dan Teknologi Volume 12 Issue 2 December 2024
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/euler.v12i2.26654

Abstract

The exchange rate of one country's currency against other countries takes an important role in the development and economic activities for a nation. This condition of the Indonesian currency exchange rate, namely the rupiah, is now continuously increasing, meaning that the exchange rate is weakening and experiencing depreciation. Apart from that, the rupiah exchange rate also experiences fluctuations, so forecasting is needed to find solutions to problems that will arise if the currency exchange rate increases. This research purpose is to find the best of network archictecture and to predict the selling rate of the rupiah (Rp) per 1USD for one year. The forecasting method used in this research is using an Artificial Neural Network (ANN) with Backpropagation algorithm. This method is suitable for use in time series analysis because the algorithm is able to adjust the data and has a relatively small error. The data used is the rupiah exchange rate against the USD in the form of time series data, which from March 1, 2019 to February 28, 2024. The data scenario of 90% training and 10% testing at the training stage obtained the best architecture 4-20-1 with MSE is 0.0010385. The data scenario is 80% training and 20% testing where in the training the best architecture is 4-25-1 with an MSE of 0.00089412. The data scenario is 70% training 30% testing where in the training the best architecture is 4-25-1 with an MSE of 0.00099221. Thus, the prediction prices used are predictions for the 80% training data scenario and 20% testing data, because the accuracy results (MSE) are better than the other two scenarios.
Kesiapan Infrastruktur Pendukung pada Destinasi Wisata dalam Mewujudkan Sustainable Tourism Development: The Readiness of Supporting Infrastructure for Tourism Destination in Achieving Sustainable Tourism Development Dalimunthe, Desy Yuliana; Valeriani, Devi; Hartini, Fitra; Wardhani, Rulyanti Susi
Society Vol 8 No 1 (2020): Society
Publisher : Laboratorium Rekayasa Sosial, Jurusan Sosiologi, FISIP Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/society.v8i1.149

Abstract

For tourism destinations, infrastructure is included as natural resources and man-made resources are natural resources and man-made resources that are needed by tourists when traveling to a tourist destination. This research focuses on the readiness of social, economic, and environmental infrastructures available in tourism destinations. This research aims to analyze the readiness of supporting infrastructure in tourism destinations to achieve Sustainable Tourism Development in Bangka Island for today and the future. This research used an analysis model of IPA (Importance Performance Analysis) to measure the level of one's importance for the performance of other parties. A person's interest was measured by comparing the level of expectation with the performance that carried out using a Likert scale. This research also discussed the extent of tourists' perceptions of the interests or expectations regarding the readiness of supporting infrastructure in the destinations to achieve Sustainable Tourism Development on Bangka Island. a total sample of 240 respondents spread across two selected tourist destinations for each Regency on Bangka Island. This research provides results that the types of infrastructure in Bangka Regency and South Bangka Regency are the concentrate here, such as the economic and social infrastructures, whereas in Central Bangka Regency, the infrastructure that becomes the concentrate here including economic, social, and environmental infrastructures, especially from waste management.
POTENSI PENGEMBANGAN FASHION STREETWEAR MELALUI MOTIF DAUN SIMPUR PADA CRAB DI PROVINSI KEPULAUAN BANGKA BELITUNG Janah, Nurul; Lusia, Rohil Agatha; Robakiah, Robakiah; Andini, Dwi; Pratiwi, Desti Aulia; Dalimunthe, Desy Yuliana
Jurnal Abdi Insani Vol 11 No 2 (2024): Jurnal Abdi Insani
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/abdiinsani.v11i2.1409

Abstract

Fashion is a product that is created to represent individual needs. Teenage fashion is growing rapidly following the times, thus the phenomenon of fashion styles emerges, one of which is the streetwear style trend which was also a trend in the 90s. One of the streetwear fashion that is widely used is cardigan. The existence of Cardigan Rajut Bangka Belitug (CRAB) has its own market share, especially in terms of youth fashion. CRAB comes with a motif that raises elements of local wisdom of the Bangka Belitung Islands Province, namely the simpur leaf.  The purpose of this activity is to produce entrepreneurial products in the form of CRAB with simpur motifs as part of the local wisdom of the Bangka Belitung Islands Province in encouraging a new economy for students. The CRAB production process uses a product feasibility test questionnaire and economic analysis. Based on the questionnaire, the results showed that there were 111 respondents. According to respondents, the CRAB product business has the opportunity to be produced and can be accepted quite well by potential consumers by 97.3%. In addition, the CRAB product business is quite promising with the results of economic analysis obtained profits that reach> 5.5 million within 3 months. So that this business is feasible to develop based on the feasibility test and economic analysis used
PEMBERDAYAAN KELOMPOK CINTA LITERASI DAN MAHASISWA CINTA STATISTIK DALAM MENDUKUNG PROGRAM DIGITALISASI DI DESA REBO, KABUPATEN BANGKA Dalimunthe, Desy Yuliana; Rozani, Muhammad; Kustiawan, Elyas; Febiola, Aulia
Jurnal Abdi Insani Vol 11 No 3 (2024): Jurnal Abdi Insani
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/abdiinsani.v11i3.1705

Abstract

The village is a strategic position to support the success of community development programs. Currently, the concept of rural development is no longer limited to the agricultural sector and basic infrastructure but leads to the development of Information and Communication Technology. Rebo Village in general still has several things that have not been managed optimally, especially related to data literacy, such as having a low interest in reading and a lack of good understanding of the importance of improving literacy culture in the community. This service activity aims to explore the sources of potential (assets) owned by the community so that the community is able to solve the problems they face independently. The service scheme through socialization activities to partners aims to provide education about the importance of literacy to all village officials and all residents. This service activity focuses on the formation of a Literacy Love Group (KECIL) at the village level by involving statistical agents and statistical love students. This group can increase the added value of Rebo village towards an independent and creative village. This can be done by managing information and empowering the community. Based on the results of the analysis of the partner satisfaction questionnaire, 65.22% of participants answered that they agreed that the theme of the socialization activities presented was in accordance with the needs of partners and the rest, namely 34.78%, answered very agree. Based on the instrument of clarity and ease of understanding of the material presented by the resource persons, 73.91% answered yes and 26.09% answered strongly agree. In addition, this activity was also felt by partners to be very useful, as evidenced by 69.57% answering yes and 30.43% answering very agreeing. Meanwhile, several participants in the socialization activity gave positive and supportive suggestions for the progress and development of future activities. Based on the entire series of activities that have been carried out, it can be concluded that this service activity can provide its own benefits for partners, as evidenced by the results of the analysis of partner satisfaction questionnaire data in Rebo Village.
SOSIALISASI PEMBERDAYAAN MASYARAKAT BERBASIS DIGITAL DALAM MENGGALI POTENSI DESA MENUJU DESA MANDIRI, UNGGUL DAN PRODUKTIF DI KELURAHAN JELITIK, SUNGAILIAT, BANGKA Dalimunthe, Desy Yuliana; Kustiawan, Elyas; Ulum, Miftahul; Simarmata, Andreas Cornel
Jurnal Abdi Insani Vol 11 No 3 (2024): Jurnal Abdi Insani
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/abdiinsani.v11i3.1752

Abstract

Jelitik Village is one of the Villages located in Sungailiat District, Bangka Regency, Bangka Belitung Islands Province which has considerable tourism potential. This tourism potential can be used to improve the local economy of the community. The development of this tourism potential is also in line with the direction of the Bangka Regency government in the establishment of a Special Economic Zone (KEK) which includes Jelitik Village. This potential should be presented digitally so that it can be accessed by all citizens. This service activity aims to explore the type of potential of the village/sub-district so as to encourage the independence of the community in the village through digital-based community empowerment. Socialization techniques to the community are an option in realizing this service activity by involving all village officials and PKK management in Jelitik Village. In addition, identification and analysis of partner needs are also needed before the implementation of this service activity. The results obtained based on the results of the analysis were that participants tended to give very agreeable and agreed answers about the benefits of the activity, the suitability of the theme, the clarity of the material and the adequacy of the infrastructure used during this service activity and there was one participant who answered disagreeing about the clarity of the material. In addition, from the results of the questionnaire analysis, it can be seen that the highest percentage is at 89%, namely respondents who answered yes to question 1. With the implementation of this socialization, the people of Jelitik are beginning to realize the importance of using digital technology in managing tourism potential. Based on the results of the analysis, with the implementation of this socialization, the people of Jelitik are beginning to realize the importance of using digital technology in managing tourism potential.
Pengaruh Konsentrasi NaOH pada Proses Deasetilasi Kitin terhadap Derajat Deasetilasi Kitosan Aldila, Herman; Nuryadin, Atin; Dalimunthe, Desy Yuliana
Jurnal Riset Fisika Indonesia Vol 1 No 2 (2021): Juni 2021
Publisher : Jurusan Fisika, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jrfi.v1i2.2017

Abstract

Chitosan have been successfully produced from the dried shrimp home industry waste (Bangka, Indonesia). Extraction of chitosan was carried out in four steps: deproteinization, demineralization, decolorization and deacetylation of chitin. The effect of NaOH concentration on deacetylation process was studied. The results shown that the increase of NaOH concentration from 20% to 60%, the chitosan DD increased. The diffusion rate of OH- causes increment of OH- attack to the amino group thus realizing the effective deacetylation of chitin. The highest chitosan DD was up to 69.49% is achieved under the optimized conditions of this process and the occurrence of deacetylation structurally demonstrated by the Fourier transform infrared (FTIR) characterization.
Co-Authors -, Khadijah Afriyanti, Zeby Melani Afrizal, Aidil Adrianda Agustin, Tria Alviari, Irfaliani Amelia, Ririn Andini, Dwi Atin Nuryadin Audieni, Febita Baiq Desy Aniska Prayanti Devi Valeriani Dewi, Amelia Endraswari, Putri Mentari Fahria, Izma Fazarin, Fatia Maura Febiola, Aulia Fitri Ramadhani Fitriyanti, Depita Halim, Niken Halim, Nikken Hartini, Fitra Herman Aldila Humairah, Reni Ilham, Muhammad Rozan Nur Ineu Sulistiana, Ineu JANAH, NURUL Jaya, Yoel Setiawan Julia Julia Kartika, Hanum Khaffi, Muhammad Akbar Kustiawan, Elyas Lavania, Delvi Lusia, Rohil Agatha Luthfiyah, Fadillah Luthfiyaturrohmah, Khilma Marcelina, Elen Maryam, Ilam Miftahul Ulum Monika, Ines Nasrun, Aja Octaviani, Julia Oktarianty, Haslen Pramita, Agnes Pramudita, Lara Pratiwi, Desti Aulia Pririzki, Sisilia Jesika Putra, Muhammad Dafi Pratama Putri, Marwah Hotimah Nada Rahma Nurhamidah, Rahma Rahmania, Dita Ridho Akbar Robakiah, Robakiah Rozani, Muhammad Rulyanti Susi Wardhani Sakti, Adam Indra Saputra, Darman Saputra, Lianda Sihamat, Jhodi Adi Silaban, Yabes Sentosa Simarmata, Andreas Cornel Sony, Muhamad Nur Bintang Sri Wahyuni Suhendra, Helen Susanti, Lia Syakila, Puput Tarius, Deli Tarius Tipani, Reza Vebtasvili Vebtasvili Wati, Pitra