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All Journal Jurnal Perikanan Kelautan Berkala Perikanan Terubuk Indonesian Journal of Forestry Research Omni-Akuatika Martabe : Jurnal Pengabdian Kepada Masyarakat PAPALELE : Jurnal Penelitian Sosial Ekonomi Perikanan dan Kelautan International Journal of Research in Community Services International Journal of Quantitative Research and Modeling
Subiyanto Subiyanto
Departemen Ilmu Kelautan, Fakultas Perikanan Dan Ilmu Kelautan, Universitas Padjadjaran
Agriculture, Biological Sciences & Forestry Arts Humanities Biochemistry, Genetics & Molecular Biology Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Engineering Environmental Science Physics Social Sciences Other

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Early Information on Active Cases in Zero Rejection Efforts for COVID-19 Patients in West Java Province 2021 Using the Feedforwards Multilayer Perceptron Neural Network Yuyun Hidayat; Subiyanto Subiyanto; Titi Purwandari; Dhika Surya Pangestu; Sukono Sukono
International Journal of Research in Community Services Vol 2, No 1 (2021)
Publisher : Research Collaboration Community (RCC)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46336/ijrcs.v2i1.140

Abstract

West Java noted, as of August 14, 2021, 653,741 people were confirmed positive for COVID-19. On the same date, the number of active COVID-19 cases in West Java was 65,000. There is a significant increase in active cases of COVID-19 in 2021 in West Java. In the period 5 June – 17 July 2021, there was an increase in the number of active cases by 95,532. In that period, active cases increased by 484%, and the Bed Occupancy Ratio (BOR) in West Java had jumped in June 2021 with the highest number of 91.6%, this figure far exceeded the WHO recommendation of 60% before finally continuing to decline and finally in August was at 30.69%. This has an impact on the incidence of patient rejection at the COVID-19 referral hospital. Active cases talk about COVID-19 patients who need medical treatment and new cases talk about the rate of spread of COVID-19 in West Java, so these two things are very strategic to study. In this study, active cases and new case were predicted using Multilayer Perceptron (MLP). The data used in this study were sourced from the COVID-19 Task Force. The data is the number of positive cases, recovered and died of COVID-19 sufferers in 34 provinces in Indonesia in the period 2 March 2020 - 14 August 2021. The results of the study found, from the results of the evaluation using data testing the number of active cases in the last 19 weeks, namely April 10 – August 14, 2021, MLP is accurate in predicting the number of active cases for the first coming week 17 times, and the next two weeks for the second week 12 times with an absolute percentage error (APE) < 20%. As for weekly new cases, MLP has been accurate 10 times for the next one week and 9 times for the next two weeks. It is hoped that the results of this study can be useful for the government as a reference in conditioning the hospital bed capacity to deal with active cases of COVID-19 in West Java in the next two weeks so that no COVID-19 patients are rejected by the hospital because the hospital is full.
Optimizing Stock Portfolio with Markowitz Method as a Reference for Investment Community Decisions Viona Prisyella Balqis; Subiyanto Subiyanto; Sudradjat Supian
International Journal of Research in Community Services Vol 2, No 2 (2021)
Publisher : Research Collaboration Community (RCC)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46336/ijrcs.v2i2.213

Abstract

An investor who wants to invest by avoiding risk makes investors tend to choose investments with the same expected return and the smallest or lowest possible risk. Therefore, investors expect to be able to maximize profits and minimize risk at the same time in investing. In a stock portfolio, it can be done by investing the funds owned by investors into several stocks so that it can reduce the risk of losses that will occur simultaneously. In choosing the right company to invest in with consideration of expected return and risk, a multi-objective optimization with multivariate objects can be used so that it can meet the expectations of investors. The portfolio concept introduced by Markowitz is a portfolio optimization intended for standard investors because it only refers to one explanation of portfolio returns. The Markowitz method can produce an optimal stock portfolio by considering the expected return and risk simultaneously so that the maximum profit can be obtained without eliminating the existing risk.
Utilizing MIKE 21 Software to Create Simple Hydrodynamic Simulations Subiyanto Subiyanto; Sudradjat Supian
International Journal of Research in Community Services Vol 2, No 1 (2021)
Publisher : Research Collaboration Community (RCC)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46336/ijrcs.v2i1.156

Abstract

This paper aim to create simple hydrodynamic simulation by using MIKE 21. The module used in MIKE 21 is LITPACK. LITPACK is one of the modules in MIKE 21 to solve hydraulic and sedimentation problems in coastal areas. Especially in this paper, the LITTLITE engine in LITPACK will be used. LITLINE determines the coastline position using a timeseries of wave climatic data. The model is based on a one-line theory, in which the cross-shore profile is expected to remain unaltered during erosion/accretion, with minor adjustments. Coastal morphology is thus only defined by coastline location (cross-shore direction) and coastal profile at a given long-shore position. The simulation used in this paper is the influence of groins on shoreline dynamics. The results of the simulation show that some areas will experience abrasion and some will experience accretion. 
SOSIALISASI PADA MASYARAKAT KABUPATEN PANGANDARAN MENGENAI BAHAYA MEMBUANG SAMPAH DI SUNGAI Sudradjat Supian; Hazman Hiwari; Subiyanto Subiyanto
Martabe : Jurnal Pengabdian Kepada Masyarakat Vol 3, No 1 (2020): Martabe : Jurnal Pengabdian Kepada Masyarakat
Publisher : Universitas Muhammadiyah Tapanuli Selatan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (636.253 KB) | DOI: 10.31604/jpm.v3i1.27-31

Abstract

Garbage is one of the problems that often occur in the community, especially in the disposal and handling of its existence. The Integrative KKNM-PPMD activity is a form of community service which based on Tridharma state of universities, can be used as a small deterrent to introduce and encourage clean action to the community to maintain the cleanliness of the environment. The purpose of this study is to educate the public about the dangers of dumping activities in the river. The activities carried out in 2 methods—first, socialization in the form of delivering information about the dangers of littering. Second, clean action activities participated in all communities around the Cikidang river. Implementation of this activity, it is expected the community can care about the cleanliness of the environment, including the river area.
SOSIALISASI MENGANAI DAMPAK BANGUNAN PANTAI TERHADAP ABRASI DI PESISIR BARAT PANTAI PANGANDARAN Yuyun Hidayat; Hazman Hiwari; Subiyanto Subiyanto
Martabe : Jurnal Pengabdian Kepada Masyarakat Vol 3, No 1 (2020): Martabe : Jurnal Pengabdian Kepada Masyarakat
Publisher : Universitas Muhammadiyah Tapanuli Selatan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (548.03 KB) | DOI: 10.31604/jpm.v3i1.17-20

Abstract

The coastal area is one area that has complex dynamics. One phenomenon that is known to have an impact on coastal activities is the erosion of the coastal area called Abrasion.  Integrated KKNM-PPM  is a community service activity of Padjadjaran University, which is carried out annually in several regions. The program can be used as a distribution of knowledge as well as community service at Padjadjaran University students, in this case, providing education about this abrasion phenomenon. The location for the integrated KKNM is RT 01 RW 04 Bojongsalawe Hamlet, Karangjaladri Village, Parigi District, Pangandaran Regency. We have known that the coastal areas in the Karangjaladri Coast area are areas that occur annually with abrasion phenomena, ranging from 0.01 to 1.2 ha erosion in a year. The Information of this paper, it is expected that the region can wisely use the process.
FAKTOR-FAKTOR YANG MEMPENGARUHI PRODUKTIVITAS TERHADAP PENDAPATAN PEMBUDIDAYA IKAN NILA (STUDI KASUS: KOTA TASIKMALAYA) Fikri Nashrullah; Atikah Nurhayati; Subiyanto Subiyanto; Asep Agus Handaka Suryana
PAPALELE: Jurnal Penelitian Sosial Ekonomi Perikanan dan Kelautan Vol 5 No 2 (2021): PAPALELE: Jurnal Penelitian Sosial Ekonomi Perikanan dan Kelautan
Publisher : Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/papalele.2021.5.2.107

Abstract

This study aims to identify various factors that affect the productivity of tilapia aquaculture in Tasikmalaya City. The location of this study was eight sub-districts of Tasikmalaya City. This research was conducted from February 2021 to November 2021. This is a quantitative and confirmatory descriptive study. The required quantitative data are primary and secondary data. The primary data were collected through two types of collection techniques, namely observation and interviews, followed by filling out questionnaires by the respondent. Meanwhile, the secondary data in this study was obtained by downloading data from the websites of the relevant agencies and the district statistical center, as well as from previous studies. In addition to several characteristics of cultivators and cultivation businesses, several conditions and obstacles experienced by cultivators are used as complementary research data. The respondents of this study are tilapia cultivators in Tasikmalaya City. The choosing of respondents was conducted by accidental sampling method. The results showed that the factors that significantly affected the productivity of tilapia aquaculture in Tasikmalaya City consisted of land size, feed price, quantity of feed, and price of fingerlings.
The Study of Value-At-Risk Calculation and Back-testing Using the ARMA-GARCH Model Based on Stock Returns: An Overview Rizki Apriva Hidayana; Subiyanto Subiyanto; Sudradjat Supian
International Journal of Research in Community Services Vol 3, No 4 (2022)
Publisher : Research Collaboration Community (RCC)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46336/ijrcs.v3i4.368

Abstract

Stocks are investment instruments that provide returns but tend to be risky. The most important component of investing is volatility, where volatility is identical to the standard conditional deviation of stock price return. The important thing in investing in addition to return is a risk. Value-at-Risk (VaR) is a statistical method of estimating maximum losses. To evaluate the quality of VaR estimates, models should always be back-tested with appropriate methods. Back-testing is a statistical procedure in which actual gains and losses are systematically compared to appropriate VaR estimates. To evaluate the quality of VaR estimates, models should always be back-tested with appropriate methods. Back-testing is a statistical procedure in which actual gains and losses are systematically compared to appropriate VaR estimates. The goal of the study was to estimate the Autoregressive Moving Average-Generalized Conditional Heteroscedastic (ARMA-GARCH) model to determine Value-at-Risk and back-testing. ARMA is a combination of AR and MA models, while GARCH is a time series model with symmetrical properties. The method in this study is systematic browsing of libraries. Systematic library tracing is an attempt to identify, evaluate, and interpret all research relevant to a particular phenomenon.  
A NATIONAL POLICY ON INDONESIA’S INTEGRATED WATER RESOURCE CONSERVATION MANAGEMENT Chay Asdak; Yulizar Yulizar; Subiyanto Subiyanto
Indonesian Journal of Forestry Research Vol 10, No 2 (2023): Indonesian Journal of Forestry Research
Publisher : Secretariat of Agency for Standardization of Environment and Forestry Instruments

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59465/ijfr.2023.10.2.151-162

Abstract

Changes in the global precipitation would affect Indonesia to improve the water resources management system. As most watersheds are in the critical stage nowadays, it is extremely important to develop a new plan and policy on water conservation which integrate the most important parameters reasonably. This has a purpose to ensure that water resources are available for all activities purposes within the area, especially for the future time period. Integrated Water Resources Conservation Management (IWCM) is one of the promising approaches that mainly developed through the participation of all stakeholders. This participation brings the equal responsibility to protect and manage the water resources in a sustainable way, which might differ from one to another area in Indonesia. Therefore, it is important to bring up local practices on water conservation management. The approach strategies that provided in this paper could improve the water national policy in Indonesia. Furthermore, it also could minimize the gap of the current regulation between local and national levels.
Co-Authors Abdurrahman Al Farrizi Agus Ismangil Ahmad Fawaid Ridwan Andre Wijaya Ankiq Taofiqurohman Asep Saepulrohman Athaya Zahrani Irmansyah Atikah Nurhayati Chay Asdak Devi Munandar Dhika Surya Pangestu Eddy Afrianto Evi Liviawaty Fikri Nashrullah Handaka, Asep Agus Hazman Hiwari Junianto Junianto Muhamad Satrio Legowo Nira Nirwana Rizki Apriva Hidayana Rusky Intan Pratama Sapinatun Namira Sudradjat Sudradjat Sudradjat Supian Sudradjat Supian Sudradjat Supian Sudradjat Supian Sudradjat Supian Sudradjat Supian Sudradjat Supian Sukono . Titi Purwandari Viona Prisyella Balqis Wahyu Gendam Prakoso Wahyuniar Pamungkas Yudi Nurul Ihsan Yulizar Yulizar Yuniarti MS Yuningsih, Siti Hadiaty Yuyun Hidayat