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All Journal LOGIK@ Kubik JURNAL ISTEK InPrime: Indonesian Journal Of Pure And Applied Mathematics KUBIK: Jurnal Publikasi Ilmiah Matematika International Journal of Global Operations Research International Journal of Quantitative Research and Modeling International Journal of Mathematics, Statistics, and Computing International Journal of Humanities, Law, and Politics International Journal of Health, Medicine, and Sports International Journal of Linguistics, Communication, and Broadcasting
Rini Cahyandari
UIN Sunan Gunung Djati Bandung
Humanities Computer Science & IT Decision Sciences, Operations Research & Management Dentistry Economics, Econometrics & Finance Education Engineering Environmental Science Health Professions Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Mathematics Medicine & Pharmacology Nursing Physics Public Health Social Sciences

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Peramalan Menggunakan Metode MS-AR, MS-Regression dan MS-VAR pada Model Perubahan Struktur Martina, Annisa; Jajuli, Marsa Aufa; Cahyandari, Rini
KUBIK Vol 9, No 1 (2024): KUBIK: Jurnal Publikasi Ilmiah Matematika
Publisher : Jurusan Matematika, Fakultas Sains dan Teknologi, UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15575/kubik.v9i1.31371

Abstract

Aktivitas ekspor dan impor memiliki peranan penting pada perdagangan internasional yang dapat meningkatkan pembangunan ekonomi di dalam negeri. Ekspor di Indonesia terdiri dari dua sektor yaitu migas dan non migas. Adanya perubahan regime dalam data migas menyebabkan volume ekspor cenderung fluktuatif dan memiliki perubahan struktur. Model perubahan struktur dapat diselesaikan dengan menggunakan metode Markov Switching (MS) yang terdiri dari MS Autoregressive, MS Regression dan MS Vector Autoregressive. Pada penelitian ini menggunakan data bulanan volume ekspor migas Indonesia selama 5 tahun (2018 sd 2022). Hasil penelitian menunjukkan bahwa terjadi perubahan struktur pada waktu ke-12 (Desember 2018) dengan 2 regime. Setelah dilakukan pemodelan dan uji diagnostik, didapatkan model terbaik untuk volume ekspor migas Indonesia adalah MS(2) menggunakan metode MS Regression dengan nilai MAPE 12.49% dan nilai peluang perpindahan regime 94%, yang menyatakan bahwa ekspor migas yang dilakukan oleh negara Indonesia memberikan dampak yang cukup baik untuk perekonomian Indonesia, terutama dalam hal perdagangan internasional.
Penerapan Hukum Mortalita Gompertz untuk Perhitungan Dana Tabarru’ dengan Metode Cost of Insurance Hidayat, Fauziah Noor; Cahyandari, Rini; Awalluddin, Asep Solih
KUBIK Vol 4, No 1 (2019): KUBIK : Jurnal Publikasi Ilmiah Matematika
Publisher : Jurusan Matematika, Fakultas Sains dan Teknologi, UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15575/kubik.v4i1.5676

Abstract

Berdasarkan cara pengelolaan dananya, asuransi syari’ah dibedakan menjadi dua, asuransi dengan unsur tabungan dan asuransi tanpa unsur tabungan. Didalam asuransi tanpa unsur tabungan, dana yang diberikan oleh peserta asuransi akan dimasukkan ke dalam satu rekening saja, yaitu rekening tabarru’. Sehingga adanya ketidakjelasan dalam presentase dana tabarru’. Cost of Insurance merupakan metode yang digunakan dalam perhitungan dana tabarru’ yang terdiri dari beberapa komponen yaitu: tabel mortalita yang digunakan, asumsi hasil investasi (i) dan asumsi biaya pengelolaan ( ). Didalam penelitian ini dilakukan perhitungan tabel mortalita dengan Hukum Gompertz yang memperhitungan risiko karena faktor usia, didalam perhitungannya dibutuhkan data acak usia yang berdistribusi Gompertz. Tabel mortalita dengan Hukum Gompertz ini yang akan digunakan untuk perhitungan dana tabarru’. Penulis menggunakan ilustrasi dengan usia peserta 41 tahun, tingkat investasi sebesar 5%, dan biaya pengelolaan sebesar 30%. Didapatkan dana tabarru’ dengan menggunakan metode Cost of Insurance sebesar Rp. 156.762/bulan.
The Development of Atomic Structures by Dalton, Thomson Rutherford and Bohr, and their Mathematical Equations Suhaimi, Nurnisaa binti Abdullah; Cahyandari, Rini; Salih, Yasir
International Journal of Quantitative Research and Modeling Vol 5, No 3 (2024)
Publisher : Research Collaboration Community (RCC)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46336/ijqrm.v5i3.759

Abstract

Thomson's atom is a solid ball or billiard ball with a positive charge that contains several negatively charged particles or electrons. These electrons will be spread on the ball like raisins on bread. The main difference between Thomson's and Rutherford's atomic models is that Thomson's model does not contain information about the atomic nucleus, while Rutherford's model does. The theory of atomic structure helps scientists understand why elements behave in certain ways in chemical reactions. For example, electron configuration determines how elements bond and form compounds. In this paper, a literature review was conducted on the development of Thomson's atomic structure model. The study method was carried out to identify elements based on their atomic number, determine their reactivity based on the number of valence electrons, and understand how atoms unite to form molecules through chemical bonds. The results of the study, by studying atomic theory, can find out about the chemical and physical properties, as well as the uses of particles or substances that exist around the universe.
Table Installments Finance Sharia of Motor Vehicle Using Proportional, Annuity, and Effective Rate Method Cahyandari, Rini; Hasanah, Faridatul
International Journal of Mathematics, Statistics, and Computing Vol. 1 No. 4 (2023): International Journal of Mathematics, Statistics, and Computing
Publisher : Communication In Research And Publications

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46336/ijmsc.v1i4.40

Abstract

One of the products offered by sharia banks is financing. In this financing, Islamic banks usually take profits in the form of margin or it can also be done by profit sharing. The base profit rate model was introduced to determine margins in Islamic bank financing. The margin generated using the base profit rate model is only in the form of a percentage. Therefore, follow-up was carried out by forming a sharia financing installment table to make it easier to see profits in nominal form. The methods used in making this installment table are the proportional method, annuity method and effective rate method. From research conducted in the case of sharia motor vehicle financing with a term of 1 year, a margin of 66.61785% was obtained and the profit based on the calculation results of the proportional method, annuity method and effective rate method was respectively IDR. 9,992,677.20,- , Rp. 5,945,097.50,-, and Rp. 5,412,700.31. So it can be concluded that the effective rate method takes the smallest profits, then followed by the annuity method and finally the proportional method which takes profits that tend to be larger.
Multiobjective Optimization of Stock Portofolio Cahyandari, Rini; Kamelia, Susan; Rusyn, Volodymyr
International Journal of Mathematics, Statistics, and Computing Vol. 2 No. 1 (2024): International Journal of Mathematics, Statistics, and Computing
Publisher : Communication In Research And Publications

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46336/ijmsc.v2i1.65

Abstract

Diversification is a method used to reduce risks by allocating several financial, industrial, and other instruments. Investors might need to use this method to allocate their companies’ funding as efficient as they should be. Mean variance portfolio is a diversification theory designated for investors who are aware of potential risks. On the other hand, multi-objective portfolio optimization is another theory that suits for investors who are more unaware, or choose to neglect potential business risks. Multi-objective optimization can boost source of income and minimize the risks while utilizing k weighting coefficient as risk aversion index. This research aims to form an optimal portfolio from each perspective of selected investors using multi-objective optimization, as well as to analyze the benefits and risks that the investors will have. Samples used in this research are sharia stocks actively involved in Jakarta Islamic Index (JII) and non-sharia stocks which are actively involved in LQ-45 from January 2013 to January 2018.
The Influence of Accountability, Transparency and Community Participation on the Effectiveness of Cibungur Tasikmalaya Village Fund Management Cahyandari, Rini; Ibrahim, Riza Andrian; Yuningsih, Siti Hadiaty
International Journal of Humanities, Law, and Politics Vol. 2 No. 2 (2024): International Journal of Humanities, Law, and Politics
Publisher : Communication in Research and Publications (CRP)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46336/ijhlp.v2i2.81

Abstract

This research investigates the influence of accountability, transparency, and community participation on the effectiveness of village fund management. This research was conducted in Cibungur, Parungponteng Subdistrict, Tasikmalaya Regency, the study adopts a quantitative approach, employing an associational research design with a sample of 100 households. Through multiple linear regression, the analysis reveals significant insights. The results indicate that accountability, transparency, and community participation individually and collectively impact the effectiveness of village fund management. Accountability exhibits a positive influence (t-value = 2.787, p-value = 0.001), as does transparency (t-value = 3.444, p-value = 0.001), while community participation also demonstrates a significant effect (t-value = -3.099, p-value = 0.003). The coefficient of determination (R²) indicates that 62.5% of the variance in village fund management effectiveness can be explained by these variables.The F-test reinforces the joint influence of transparency, accountability, and community participation, with a significant F-value of 53.392 and a p-value of 0.001. This study underscores the intricate dynamics between governance principles and community involvement for optimal village fund utilization, contributing to sustainable development and community welfare. Thus, this research not only fills knowledge gaps, but also provides a holistic view of efforts towards sustainable development and community welfare through optimizing village fund management.
Analysis of Students' Understanding and Motivation of Volleyball Extracurricular Activities at SMK Sariwangi Tasikmalaya Prabowo, Agung; Nurnisaa Binti Abdullah Suhaimi; Cahyandari, Rini
International Journal of Health, Medicine, and Sports Vol. 2 No. 2 (2024): International Journal of Health, Medicine, and Sports
Publisher : Corespub

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46336/ijhms.v2i2.99

Abstract

This research aims to evaluate the understanding and motivation of Tasikmalaya 1 Public High School students towards the extracurricular sport of volleyball. The research method used is quantitative descriptive using a Likert scale. The research results show that some students still have a limited understanding of volleyball, even though the majority like this extracurricular activity. Lack of motivation in playing volleyball is caused by limited facilities and limited practice time. Characteristics of volleyball extracurricular participants include a high level of sportsmanship, while the teenage phase marks a significant phase in the participant's development. This research highlights the importance of developing intrinsic motivation in students to increase participation in extracurricular activities and offers insight into how volleyball extracurriculars can be an effective tool in student character formation and self-development.
The Impact of Diabetic Foot Exercises and Warm Water Foot Soaking Intervention Cahyandari, Rini; Kalfin; Ibrahim, Riza Andrian
International Journal of Health, Medicine, and Sports Vol. 2 No. 2 (2024): International Journal of Health, Medicine, and Sports
Publisher : Corespub

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46336/ijhms.v2i2.102

Abstract

This study investigates the efficacy of diabetic foot exercises and warm water foot soaking in improving peripheral blood circulation in patients with diabetes mellitus. A paired samples test was conducted to assess the correlation between pre- and post-intervention data. The results revealed a significant correlation (p < 0.05), indicating the effectiveness of the interventions in enhancing peripheral blood circulation. Warm water foot soaking alleviated pain by stimulating endorphin production and dilating blood vessels, while diabetic foot exercises contributed to improved circulation and ulcer prevention. The combined approach holds promise for integrating into comprehensive diabetes care programs to enhance patients' quality of life and prevent complications. Abstract: This study investigates the efficacy of diabetic foot exercises and warm water foot soaking in improving peripheral blood circulation in patients with diabetes mellitus. A paired samples test was conducted to assess the correlation between pre- and post-intervention data. The results revealed a significant correlation (p < 0.05), indicating the effectiveness of the interventions in enhancing peripheral blood circulation. Warm water foot soaking alleviated pain by stimulating endorphin production and dilating blood vessels, while diabetic foot exercises contributed to improved circulation and ulcer prevention. The combined approach holds promise for integrating into comprehensive diabetes care programs to enhance patients' quality of life and prevent complications.
The Role of Physical Activities in Enhancing Physical Fitness Among the Community Saefullah, Rifki; Hidayana, Rizki Apriva; Cahyandari, Rini
International Journal of Health, Medicine, and Sports Vol. 2 No. 3 (2024): International Journal of Health, Medicine, and Sports
Publisher : Corespub

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46336/ijhms.v2i3.124

Abstract

This paper delves into the significance of engaging in sports and physical activities to improve the physical fitness of the community. The study explores the impact of physical activities on overall health and presents various strategies to promote and encourage participation in sports and exercise. The research methodology includes a comprehensive review of literature and case studies to highlight the benefits and challenges of implementing physical activities in enhancing the well-being of society. The findings emphasize the importance of early education, accessible facilities, and technological advancements in fostering a healthier and more active lifestyle. In conclusion, promoting physical activities emerges as a pivotal solution to counter the prevailing sedentary lifestyle and boost the physical fitness of the community.
The Effect of Stevia Leaves as a Sugar Substitute in Reducing the Risk of Kidney Failure: A Literature Study Andrian Ibrahim, Riza; Lianingsih, Nestia; Cahyandari, Rini
International Journal of Health, Medicine, and Sports Vol. 2 No. 3 (2024): International Journal of Health, Medicine, and Sports
Publisher : Corespub

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46336/ijhms.v2i3.127

Abstract

Excessive sugar consumption has been linked to an increased risk of kidney failure, prompting research into alternative sweeteners. This literature study investigates the potential of Stevia leaves (Stevia rebaudiana) as a sugar substitute in reducing the risk of kidney failure. A comprehensive review of studies published between 2013 and 2023 was conducted using databases such as PubMed, ScienceDirect, and Google Scholar. The analysis revealed that high sugar intake, particularly from sweetened beverages, is associated with a higher risk of chronic kidney disease (CKD). Stevia, a zero-calorie sweetener, demonstrated promising results in weight management and glycemic control, both crucial factors in kidney health. Several studies reported improvements in kidney function markers, including serum creatinine and microalbumin levels, in CKD patients supplemented with Stevia. Additionally, Stevia's antioxidant properties may protect kidney tissues from oxidative stress. While the findings suggest Stevia's potential as a beneficial sugar substitute for kidney health, limitations in current research, including short study durations and unclear mechanisms of action, highlight the need for more comprehensive, long-term studies. This review concludes that Stevia shows promise as a tool in the prevention and management of kidney diseases, but further research is needed to fully understand its role and optimize its use in dietary interventions for kidney health.
Co-Authors Abdul Halim, Nurfadhlina Agung Prabowo Agus Jamaludin Agus Tinus Setianto Andrian Ibrahim, Riza Annisa Ulfiyah Arief Fatchul Huda Arif F. Huda, Arif F. Asep Solih Asep Solih Awalluddin, Asep Solih Dara Selvi Mariani Delia Fatharani Durrah HASANAH, FARIDATUL Herlin Dewi Karlina, Herlin Dewi Hidayana, Rizki Apriva Hidayat, Fauziah Noor Ibrahim, Riza Andrian Jajuli, Marsa Aufa kalfin Kalfin Kamelia, Susan Lianingsih, Nestia Martina, Annisa Masitoh Majid, Masitoh Nurnisaa Binti Abdullah Suhaimi Puspa Liza Ghazali Rahmawati, Weni Rima Erviana Rusyn, Volodymyr Saefullah, Rifki Saepuloh, Aep Salih, Yasir Suhaimi, Nurnisaa binti Abdullah Sukono Sukono Tarkinih Tarkinih Vimelia, Willen Yuningsih, Siti Hadiaty