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1st International Symposium on Space Science 2019, ISSS 2019

作者： Pangestu, A.D. Dermawan, B. Master Program in Astronomy Faculty of Mathematics and Natural Sciences Institut Teknologi Bandung Indonesia National Institute of Aeronautics and Space Indonesia

Centaurs are small bodies whose semi-major axes are located between Jupiter and Neptune. They have chaotic orbits and may be in orbital resonances with giant planets. An orbital resonance occurs when a simple commensurability presents between some fundamental frequencies of orbital elements. One of the resonance states is 1:1 (mean motion) resonance or co-orbital with the respected planet. This resonance can also occur in high inclination Centaurs. This study describes the results of long term orbital integration of a retrograde Centaur 2006 RJ2 (inclination of 165°) for 200,000 years. Resonance state of 2006 RJ2 was examined using the FAIR (Fast Identification of Mean Motion Resonance) method for 243 orbital clones with automation by developing Python codes. We report that 2006 RJ2 may be in retrograde 1:1 resonance with Saturn for about 160,000 years in the future. However, the clones exhibit chaotic orbits and show many temporally unstable resonances. Since the quality of its orbital elements is not quite precise, 2006 RJ2 shows a low possibility in the state of long retrograde 1:1 resonance with Saturn. © 2020 Published under licence by IOP Publishing Ltd.

关键词： Resonance

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Does gender affect the mathematics creativity of junior high school students? 2

Does gender affect the mathematics creativity of junior high...

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2nd Ahmad Dahlan International Conference on mathematics and mathematics Education, ADINTERCOMME 2019

作者： Permatasari, S.D.A. Budiyono Pratiwi, H. Master Program of Mathematics Education Universitas Sebelas Maret Jl. Ir. Sutami No. 36 A Surakarta Indonesia

mathematics learning in the 21st century is a learning that emphasizes the importance of development in 4 aspects (4C), one of them is creativity. Mathematical creativity is students' skill to solve a problem with several strategies to reach different answers in certain tasks which are useful in developing mathematical reasoning. Relating to this context, nowadays, the issues of gender in education have been concern, that education must treat male and female students as equal. This research used one-way ANOVA to analyze the differences between the mathematical creativity between male and female students in junior high school. The research method used was quantitative descriptive. The sample of this research was 56 students of SMP Batik Surakarta who were taken by random sampling method. The results found that male and female students did not have differences in the ability of mathematical creativity. The insignificant difference can only be seen from their average scores. Female students are superior to male in the indicators of fluency, flexibility, and elaboration, but not in the indicator of originality. © Published under licence by IOP Publishing Ltd.

关键词： Students

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On Log-q-Gaussian Distribution

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Calcutta Statistical Association Bulletin 2018年第2期70卷 105-121页

作者： Koike, Ken-Ichi Shimegi, Yuya Department of Mathematics Faculty of Pure and Applied Sciences University of Tsukuba Ibaraki Tsukuba Japan Master’s Program in Education University of Tsukuba Ibaraki Tsukuba Japan

We propose the log-q-Gaussian distribution which is obtained as the distribution of a random variable whose logarithm is q-Gaussian. Various types of properties of the new distribution are given such as the moments, the cumulative distribution function, the extreme value distribution, the likelihood estimation, and so on. Some examples for real data are also given. AMS Classification: 60Exx 62Exx. © 2018 Calcutta Statistical Association, Kolkata.

关键词： extreme value distribution log-normal distribution Log-q-Gaussian distribution q-Gaussian distribution

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Automatic detection of ischemic stroke based on scaling exponent electroencephalogram using extreme learning machine 5

Automatic detection of ischemic stroke based on scaling expo...

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5th International Conference on Science and Engineering in mathematics, Chemistry and Physics 2017, ScieTech 2017

作者： Adhi, H.A. Wijaya, S.K. Prawito Badri, C. Rezal, M. Biomedical Engineering Master Program Universitas Indonesia Jakarta Indonesia Faculty of Mathematics and Natural Sciences Universitas Indonesia West Java Indonesia

Stroke is one of cerebrovascular diseases caused by the obstruction of blood flow to the brain. Stroke becomes the leading cause of death in Indonesia and the second in the world. Stroke also causes of the disability. Ischemic stroke accounts for most of all stroke cases. Obstruction of blood flow can cause tissue damage which results the electrical changes in the brain that can be observed through the electroencephalogram (EEG). In this study, we presented the results of automatic detection of ischemic stroke and normal subjects based on the scaling exponent EEG obtained through detrended fluctuation analysis (DFA) using extreme learning machine (ELM) as the classifier. The signal processing was performed with 18 channels of EEG in the range of 0-30 Hz. Scaling exponents of the subjects were used as the input for ELM to classify the ischemic stroke. The performance of detection was observed by the value of accuracy, sensitivity and specificity. The result showed, performance of the proposed method to classify the ischemic stroke was 84 % for accuracy, 82 % for sensitivity and 87 % for specificity with 120 hidden neurons and sine as the activation function of ELM. © Published under licence by IOP Publishing Ltd.

关键词： Electroencephalography

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Spectroscopic Observations of Ten Galactic Wolf-Rayet Stars at Bosscha Observatory:Determination of Stellar Parameters and Mass-loss Rates

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Research in Astronomy and Astrophysics 2024年第9期24卷 7-27页

作者： Hakim Luthfi Malasan Bakuh Danang Setyo Budi Department of Astronomy Faculty of Mathematics and Natural SciencesInstitut Teknologi BandungBandung 40132Indonesia Bosscha Observatory Institut Teknologi BandungLembang 40391Indonesia Master Program in Astronomy Faculty of Mathematics and Natural SciencesInstitut Teknologi BandungJl.Ganesha No.10Bandung 40132Indonesia

We present optical spectra of 10 Galactic Wolf-Rayet(WR)stars that consist of five WN and five WC *** optical observation was conducted using a low-resolution spectrograph NEO-R1000(λ/Δλ~1000)at GAO-ITB RTS(27.94 cm,F/10.0),Bosscha Observatory,*** implemented stellar atmosphere Postdam Wolf-Rayet(PoWR)grid modeling to derive stellar *** normalized optical spectrum can be used to find the best model from the available PoWR grid,then we could derive stellar temperature and transformation *** derive luminosity,stellar radius and color excess,we conducted a Spectral Energy Distribution(SED)analysis with additional data on the near-ultraviolet spectrum from the International Ultraviolet Explorer(IUE)database,and UBV and 2MASS JHK broadband filter *** analysis to derive asymptotic terminal wind velocity was conducted from the P-Cygni profile analysis of the high-resolution IUE ultraviolet *** previously derived parameters,we could determine the mass loss rate of the WR ***,we compared our results with previous work that used PoWR code and the differences are not more than 20%.We conclude that the PoWR spectral grid is sufficient to derive WR stellar parameters quickly and could provide more accurate initial parameter input to the PoWR program code.

关键词： stars:massive stars:mass-loss stars:Wolf-Rayet stars:atmospheres stars:winds outflows

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The gut-skin axis in psoriasis: Evidence-based insights from a meta-analysis on probiotics-synbiotics-mediated microbiota interventions

Medicine in Microecology

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Medicine in Microecology 2025年 25卷

作者： Amalia, Nurlinah Wicaksono, Danar Wiyarta, Elvan Rampengan, Derren David Christian Homenta Darmawan, Hari Aditya, Muhammad Reva Athallah, Ariq Fadhil Cahyono, Maulana Bagus Adi Alatas, Aiman Idrus Tallei, Trina Ekawati Tjandrawinata, Raymond Rubianto Bhunia, Arun K. Nurkolis, Fahrul Medical Study Program Faculty of Medicine Universitas Brawijaya East Java Malang Indonesia Master Program of Biomedical Science Faculty of Medicine Universitas Brawijaya East Java Malang Indonesia Medical Research Center of Indonesia East Java Surabaya Indonesia Alumnus Department of Dermatology and Venereology Faculty of Medicine Public Health and Nursing Universitas Gadjah Mada Yogyakarta Indonesia University of Indonesia Hospital Depok 16424 Indonesia Risetku Jakarta South Jakarta 12820 Indonesia Medical Study Program Faculty of Medicine Universitas Sam Ratulangi North Sulawesi Manado Indonesia Dermatovenerology Department Faculty of Medicine Universitas Tarumanagara Jakarta Indonesia Medical Study Program Faculty of Medicine Universitas Airlangga East Java Surabaya Indonesia Program of Clinical Microbiology Residency Faculty of Medicine University of Indonesia Jakarta Indonesia Department of Biology Faculty of Mathematics and Natural Sciences Sam Ratulangi University Manado 95115 Indonesia Center for Pharmaceutical and Nutraceutical Research and Policy Faculty of Biotechnology Atma Jaya Catholic University of Indonesia Jakarta 12930 Indonesia Molecular Food Microbiology Laboratory Department of Food Science Purdue University West Lafayette 47907 IN United States Purdue Institute of Inflammation Immunology and Infectious Diseases Purdue University West Lafayette 47907 IN United States Department of Comparative Pathobiology Purdue University West Lafayette 47907 IN United States Master of Basic Medical Science Faculty of Medicine Universitas Airlangga Surabaya Indonesia State Islamic University of Sunan Kalijaga (UIN Sunan Kalijaga) Yogyakarta 55281 Indonesia

Psoriasis, a chronic immune-mediated skin condition, has been intricately linked to gut microbiota dysbiosis through the gut-skin axis. This meta-analysis synthesizes data from 15 randomized controlled trials encompassing 1,423 participants to evaluate the efficacy of gut microbiota interventions—probiotics and synbiotics—in psoriasis management. The findings reveal that probiotics significantly improved the Psoriasis Area and Severity Index (PASI) (Mean Difference [MD]: −4.05, 95 % CI: −6.73 to −1.38;p < 0.0001) and Dermatology Life Quality Index (DLQI) (MD: −5.74, 95 % CI: −11.45 to −0.03;p = 0.0001), outperforming synbiotics and systemic pharmacological therapies such as anti-TNF-α and anti-interleukin agents. Notably, probiotics demonstrated superior systemic anti-inflammatory (TNF-α and IL-17) and immunomodulatory responses, and enhanced gut barrier integrity. This study highlights probiotics as a promising adjunct or alternative therapy, paving the way for integrative treatment strategies that address psoriasis's multifaceted pathophysiology. Future research should focus on long-term efficacy and molecular mechanisms to optimize outcomes. These findings could redefine therapeutic paradigms, offering a cost-effective and accessible solution for millions of psoriasis patients worldwide. © 2025 The Authors

关键词： Gut microbiota Gut-skin axis Immune modulation Probiotics Psoriasis Synbiotics Systemic inflammation

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Improved LSTM hyperparameters alongside sentiment walk-forward validation for time series prediction

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Journal of Open Innovation: Technology, Market, and Complexity 2025年第1期11卷

作者： Wahyuddin, Eko Putra Caraka, Rezzy Eko Kurniawan, Robert Caesarendra, Wahyu Gio, Prana Ugiana Pardamean, Bens Department of Statistical Computing Politeknik Statistika STIS Jakarta 13330 Indonesia Statistics Indonesia (BPS) Jl. Dr Sutomo 6-8 Jakarta Indonesia School of Economics and Business Telkom University Bandung 40257 Indonesia Research Center for Data and Information Sciences Research Organization for Electronics and Informatics National Research and Innovation Agency (BRIN) Bandung 40135 Indonesia Faculty of Integrated Technologies Universiti Brunei Darussalam Gadong BE1410 Brunei Darussalam Department of Mathematics Universitas Sumatera Utara Medan 20155 Indonesia Bioinformatics and Data Science Research Centre Bina Nusantara University DKI Jakarta 11480 Indonesia Computer Science Department BINUS Graduate Program Master of Computer Science Program Bina Nusantara University DKI Jakarta 11480 Indonesia

This study aims to address the common issue of biased estimation errors in time series modeling by analyzing the error in locating ideal hyperparameters and defining appropriate validation methods. Specifically, it focuses on predicting the stock price of Bank Rakyat Indonesia using a combination of historical stock prices, technical indicators, exchange rates, and news sentiment data, while determining the optimal variables for deep learning models. Employing a deep learning-based Long-Short Term Memory (LSTM) model, the study optimizes hyperparameters alongside walk-forward validation for time series prediction. It explores different combinations of variables and adapts the sliding window approach to the context of the data. The results highlight the importance of optimizing hyperparameters and utilizing walk-forward validation for accurate time series prediction. The model incorporating historical stock prices and sentiment scores outperforms others, achieving an RMSE of 96.61 and MAE of 86.97. Incorporating sentiment scores reduces RMSE by 39.55 % compared to models using only historical stock prices, while adding technical indicators does not yield improvement. This study contributes to the field by addressing the issue of biased estimation errors in time series modeling, offering insights into the optimization of hyperparameters and validation methods for accurate predictions. It also underscores the significance of incorporating sentiment analysis alongside historical stock prices for improved forecasting accuracy. © 2024 The Authors

关键词： LSTM Sentiment analysis Stock price prediction Time series modeling Validation methods

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Stakeholder Analysis in Utilizing of Environmental Services and Natural Attractions in Tuk Semuncar Utilization Zone of Gunung Merbabu National Park: A literature review 2

Stakeholder Analysis in Utilizing of Environmental Services ...

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2nd International Conference on Energy, Environmental and Information System, ICENIS 2017

作者： Setiawan, Muhammad Arif Muhammad, Fuad Master Program of Environmental Science School of Postgraduate Studies Diponegoro University Semarang Indonesia Faculty of Science and Mathematics Diponegoro University Semarang Indonesia

Many stakeholders in the utilizing of environmental services and natural attraction of Tuk Semuncar Utilization Zone needs to get the attention of the Gunung Merbabu National Park Officer. The existence of natural resources has an important role for the life of the community, making the complexity of the relationship between various parties who have interests in natural resource management. The existence of stakeholders and their interests should receive attention and be considered to be accommodated as an effort to prevent the occurrence of losses to the conservation area of Gunung Merbabu National Park. Every stakeholder's interest can have a positive and negative impact on other stakeholders. Stakeholder analysis can help in understanding the conflict on the utilizing of environmental services and natural attraction that is happening, as well as input strategy in involving stakeholders for the achievement of goals. © 2018 The Authors, published by EDP Sciences.

关键词： Natural resources management

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Information system for diagnosis in pregnant chronic energy deficiency using a rule based system algorithm 10

Information system for diagnosis in pregnant chronic energy ...

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10th International Seminar on New Paradigm and Innovation of Natural Sciences and itsApplication, ISNPINSA 2020

作者： Sustamy, R.P. Widyawati, M.N. Suryono, S. Master of Applied Science in Midwifery Program Poltekkes Kemenkes Semarang Indonesia Departement of Physics Faculty of Science and Mathematics University Diponegoro Semarang Indonesia

The condition of Chronic Energy Deficiency (CED) has become one of the causes of high maternal mortality. Improper handling of CED will have an impact on the health problems of both mother and baby. This is because when the diagnosis is still using conventional methods, so it takes a long time or is not time efficient, an alternative is needed to improve the quality of information system-based services in diagnosing mothers with CED. In this research, an information system design was carried out using the SDLC (System Development Life Cylce) method with the waterfall model which includes: needs analysis, design, implementation, and offer. Analysis of speed data using respondents 15 chronic energy deficiency pregnant and static test using Mann Whitney obtained p-value 0.000 p © Published under licence by IOP Publishing Ltd.

关键词： Information systems

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Application Mail Tracking Using RSA Algorithm As Security Data and HOT-Fit a Model for Evaluation System 2

Application Mail Tracking Using RSA Algorithm As Security Da...

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2nd International Conference on Energy, Environmental and Information System, ICENIS 2017

作者： Permadi, Ginanjar Setyo Adi, Kusworo Gernowo, Rahmad Master Program of Information System School of Postgraduate School Universitas Diponegoro Indonesia Physic Department Faculty of Science and Mathematics Universitas Diponegoro Indonesia

RSA algorithm give security in the process of the sending of messages or data by using 2 key, namely private key and public *** this research to ensure and assess directly systems are made have meet goals or desire using a comprehensive evaluation methods HOT-Fit *** purpose of this research is to build a information system sending mail by applying methods of security RSA algorithm and to evaluate in uses the method HOT-Fit to produce a system corresponding in the faculty physics. Security RSA algorithm located at the difficulty of factoring number of large coiled factors prima, the results of the prime factors has to be done to obtain private key. HOT-Fit has three aspects assessment, in the aspect of technology judging from the system status, the quality of system and quality of service. In the aspect of human judging from the use of systems and satisfaction users while in the aspect of organization judging from the structure and environment. The results of give a tracking system sending message based on the evaluation acquired. © 2018 The Authors, published by EDP Sciences.

关键词： Quality of service

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