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All Journal SAINSMAT Jurnal Sains dan Teknologi JTAM (Jurnal Teori dan Aplikasi Matematika) Al-Khwarizmi: Jurnal Pendidikan Matematika dan Ilmu Pengetahuan Alam JEMMA | Journal of Economic, Management and Accounting To Maega: Jurnal Pengabdian Masyarakat Jurnal Varian Jurnal Sains Manajemen  Nitro Journal of Mathematics and Applied Statistics
Didiharyono, D.
IBK Nitro Makassar
Humanities Computer Science & IT Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Industrial & Manufacturing Engineering Mathematics Social Sciences Other

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Changes in Rainfall Intensity, Rising Air Temperature, Wind Speed, and Its Relationship with Land Use in Makassar City D., Didiharyono; Giarno, Giarno; Sapareng, Sukriming
JST (Jurnal Sains dan Teknologi) Vol. 11 No. 2 (2022)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (775.399 KB) | DOI: 10.23887/jstundiksha.v11i2.45604

Abstract

Makassar City is one of the big cities that is growing very rapidly in Indonesia which has a large coastal area. This city is very vulnerable to the impact of changes in climate variables such as rainfall, temperature and wind speed, especially when there are indications of massive land use changes. The aim of the research is to identify changes in the trend of high-intensity rainfall, changes in air temperature, wind speed, and their relationship to changes in land use in Makassar City which have an impact on climate change. Observation data at Maritime Meteorological Station of Paotere, Makassar for 30 years is used to detect changes in climate variables by using slope calculations on linear equations, line graphs, and boxplots. The results showed that the air temperature in Makassar has a lower increasing (0.06oC/year) than Indonesian region which is around 0.3 oC. The slope values at 07.00 WITA, 13.00 WITA, and 18.00 WITA representing temperatures in the morning, afternoon, and evening are 0.0387, 0.0476, and 0.0417. While the average slope of air temperature is 0.042. However, Rising of air temperature is followed by a decrease in the accumulation of annual rainfall to below 3000 mm/year. In addition, heavy rains that cause flooding, increasing the maximum wind speed also need to be observed because wind speed is one of the causes of hydrometeorological disasters that often occur.
Investment Risk Analysis On Bitcoin With Applied of VaR-APARCH Model Kasse, Irwan; Mariani, Andi; Utari, Serly; D., Didiharyono
JTAM (Jurnal Teori dan Aplikasi Matematika) Vol 5, No 1 (2021): April
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/jtam.v5i1.3220

Abstract

Investment can be defined as an activity to postpone consumption at the present time with the aim to obtain maximum profits in the future. However, the greater the benefits, the greater the risk. For that we need a way to predict how much the risk will be borne. Modelling data that experiences heteroscedasticity and asymmetricity can use the Asymmetric Power Autoregressive Conditional Heteroscedasticity (APARCH) model. This research discusses the time series data risk analysis using the Value at Risk-Asymmetric Power Autoregressive Conditional Heteroscedasticity (VaR-APARCH) model using the daily closing price data of Bitcoin USD period January 1 2019 to 31 December 2019. The best APARCH model was chosen based on the value of Akaike's Information Criterion (AIC). From the analysis results obtained the best model, namely ARIMA (6,1,1) and APARCH (1,1) with the risk of loss in the initial investment of IDR 100,000,000 in the next day IDR 26,617,000. The results of this study can be used as additional information and apply knowledge about the risk of investing in Bitcoin with the VaR-APARCH model.
Co-Authors Abri Hadi Achmad Fahruddin Rais Aditya Idris Ahmad Fadlan Amiruddin Akbar Fisu Andi Mariani Andi Mattingaragau Tenrigau Anthony Anggrawan Arno, Giarno B. Bakhtiar Bakhtiar Bakhtiar Bakhtiar, B. Besse Qurani Chaerul, Andi Molang Eka Purnama Ferdian, Arif Giarno Giarno Herawati, Baiq Candra Hisma Abduh Irfan Abbas Irfan Arifandy Irwan Kasse Lalu Ganda Rady Putra Liza Utami Marzaman Mannuhung, Suparman Marsal Marsus Suti Maulidina Maulidina Muh. Irwan Muh. Nasir Hamzah Muh. Zadly Syahdi Muhallim, Muhlis Muhammad Fikri Muhammad Syukri Nurhidayati, Maulida Nurhuda Nurhuda Nurtiti Sunusi Patahiruddin Patahiruddin Rosnaini Daga Siti Afiyah Siti Soraya Sumarni Susilawati Suparman Manuhung Ulfa Utami Mappe Utari, Serly Zulham A. Hafid