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Penerapan Metode ARIMA-ARCH/GARCH untuk Meramalkan Harga Saham Hanjaya Mandala Sampoerna Tbk Wulandari, Ratri; Sidik; Sari, Virgania; Laksita, One Triska
Journal of Applied Statistics and Data Mining Vol. 3 No. 1 (2022): Journal Applied Statistics and Data Mining
Publisher : Institut Teknologi Statistika dan Bisnis Muhammadiyah Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.63229/jasdm.v3i1.29

Abstract

Pergerakan harga saham di suatu negara dapat digunakan sebagai indikator untuk menilai kondisi perekonomian negara tersebut. PT Hanjaya Mandala Sampoerna Tbk. adalah salah satu perusahaan rokok terbesar di Indonesia dan termasuk dalam kategori saham blue chip. Saham Sampoerna menawarkan potensi capital gain yang signifikan bila dijadikan investasi jangka panjang. Harga saham umumnya mengikuti fenomena fluktuasi berkelompok atau volatility clustering. Fenomena ini terjadi ketika harga aset finansial mengalami perubahan drastis selama periode tertentu, sementara pada periode lainnya harga tetap stabil. Volatilitas sering ditandai dengan fase fluktuasi tinggi yang kemudian diikuti oleh periode fluktuasi rendah, dan kembali meningkat. Untuk data time series yang menunjukkan variasi fluktuatif, model yang digunakan adalah ARCH/GARCH. Penelitian ini menggunakan data harga saham PT Hanjaya Mandala Sampoerna Tbk. dari Januari 2017 hingga Desember 2020, dengan nilai tertinggi tercatat pada tahun 2018. Hasil analisis menunjukkan bahwa model terbaik adalah ARIMA (1,1,1) ARCH (1), yang memprediksi penutupan harga saham pada 4 Januari 2021 mengalami keuntungan sebesar 1504 dengan nilai error 11.
Penyesuaian Desain Ruang Terhadap Perubahan Aktivitas Pengguna Di Era New Normal Studi Kasus : Plaza Pragolo Sutyaningsih, Irnade Salva; Wulandari, Ratri
Jurnal Arsitektur ARCADE Vol 6 No 2 (2022): Jurnal Arsitektur ARCADE Juli 2022
Publisher : Prodi Arsitektur UNIVERSITAS KEBANGSAAN

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Abstract:The current COVID-19 pandemic has had a significant impact on the tourism and creative economy sectors as well as on the industrial and trade sectors for MSMEs (Micro, Small, and Medium Enterprises). The impact of the Covid-19 pandemic has also affected the Plaza Pragolo MSME Center. The space at Plaza Pragolo has not had a good response to the pandemic situation. The current condition of the space is not yet organized and does not meet the standards. The current pandemic situation has resulted in changes in human activities and habits. Based on field observations carried out at Plaza Pragolo, it was found that there was a need for adjustments to room facilities, circulation, and distance arrangements, as well as space design for the pandemic situation in the interior space. The purpose of this study was to determine the adjustment of the design of the space contained in the interior space in the public space of the Plaza Pragolo Pati MSME Center due to changes in space user activities in the new normal era of the Covid-19 pandemic. The method used in this research is the descriptive qualitative research method. Data was collected through interviews with plaza managers and direct observation of the location of the case study. The problems that occur and the data obtained will then be analyzed. The final result of the analysis can be concluded that in the interior space of Plaza Pragolo there has not been any room design adjustment that meets health protocol standards for changes in activity in the new normal era of the Covid-19 pandemic.Abstrak: Pandemi COVID-19 saat ini memberikan dampak  yang signifikan pada sektor pariwisata dan ekonomi kreatif serta berpengaruh terhadap sektor perindustrian dan perdagangan pada UMKM (Usaha Mikro Kecil dan Menengah). Dampak pandemi Covid-19 juga berimbas pada Pusat UMKM Plaza Pragolo. Ruang pada Plaza Pragolo belum memiliki respon yang baik terhadap situasi pandemi. Kondisi ruang saat ini belum terorganisir dan belum memenuhi standar. Situasi pandemi saat ini mengakibatkan adanya perubahan aktivitas dan kebiasaan manusia. Berdasarkan observasi lapangan yang dilakukan pada Plaza Pragolo ditemukan  perlunya penyesuaian pada fasilitas ruang, pengaturan sirkulasi dan jarak, serta desain ruang terhadap situasi pandemi pada ruang interiornya. Tujuan penelitian ini untuk mengetahui penyesuaian desain ruang yang terdapat dalam ruang interior pada ruang publik Pusat UMKM Plaza Pragolo Pati dikarenakan adanya perubahan aktivitas pengguna ruang di era new normalpandemi Covid-19. Metode yang digunakan pada penelitian adalah metode penelitian kualitatif deskriptif. Pengumpulan data dilakukan melalui wawancara dengan pengelola plaza dan observasi langsung ke lokasi studi kasus. Permasalahan yang terjadi dan data yang diperoleh kemudian akan dianalisis. Hasil akhir dari analisis tersebut dapat ditarik kesimpulan bahwa pada ruang interior Plaza Pragolo belum ditemukan penyesuaian desain ruang yang memenuhi standar protokol kesehatan terhadap adanya perubahan aktivitas di era new normal pandemi Covid-19. 
Elemen Smart Library pada Interior Perpustakaan Perguruan Tinggi Syahida, Arifah Nur; Wulandari, Ratri; Haristianti, Vika
Waca Cipta Ruang Vol. 7 No. 1 (2021): Waca Cipta Ruang : Jurnal Ilmiah Desain Interior
Publisher : Program Studi Desain Interior Unikom

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34010/wcr.v7i1.3999

Abstract

University’s Library is a supporting of academic activities for the achievement of learning objectives, organizing learning for each study program, collections of learning strategies and supporting material for learning evaluation. With the advancement of technology and information, people prefer to search for information through online media without having to look for books in the library. Therefore, it is necessary to increase library facilities through the Smart Library concept which have 4 concepts including smart service, smart place, smart governance, and smart people. By referring to these 4 concepts, it is hoped that the University Libraries in Indonesia, especially in the city of Bandung, can be superior and can improve education for the wider community.
FASILITAS BREAKOUT AREA SEBAGAI UPAYA TERCIPTANYA SOCIAL SUSTAINABILITY PADA KARYAWAN BANK BUMN Fajriani, Mediva Dyah; Ratri Wulandari
Jurnal Dimensi Seni Rupa dan Desain Vol. 19 No. 1 (2022): Jurnal Dimensi Seni Rupa dan Desain
Publisher : Fakultas Seni Rupa dan Desain, Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/dim.v19i1.12845

Abstract

Social sustainability is now often known as an important strategy in the running of a corporation in developing its human resources, including Bank BUMN. This banking company is currently still facing problems in the form of an overworked culture for its employees which causes stress and decreases work productivity. This study analyzes the needs and activities of Bank BUMN employees to provide work facilities that can be a way out of these problems. The research method used is a mix-method that tends to be descriptive with analysis showing that breakout area facilities can be a step in fulfilling employee job satisfaction and creating social sustainability in the work environment of Bank BUMN.
Ovarian Fibrothecoma: A Residual Malignant Case Wulandari, Ratri; Trirahmanto, Addin; Kusumanto, Ardhanu
Biomedika Vol 17, No 1 (2025): Biomedika Februari 2025
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/biomedika.v17i1.6668

Abstract

Ovarian fibrothecomas, sex cord-stromal tumors consisting of theca-like elements and fibrous tissue, are solid tumors of the ovary, accounting for 1–4.7% of all ovarian tumors. If the tumors cannot be differentiated between fibroma and thecoma, they are categorized as fibrothecoma. These solid tumors are common, but their malignant type is extraordinarily rare. Here we present a residual malignant ovarian fibrothecoma in a 67-year-old woman. This patient complained of abdominal mass, she previously had laparotomy four times and two series of chemotherapy with paclitaxel and carboplatin within 19 years. Despite these, she currently has a residual disease measuring 13.5 x 11.6 x10.8 cm. In this case report, we will discuss the management of malignant fibrothecoma based on the available literature
Coastal Area Resilience Assessment Study of Kalibuntu to Rob Flood Disaster: Studi Penilaian Tingkat Ketahanan Kawasan Pesisir Kalibuntu Terhadap Bencana Banjir Rob Wulandari, Ratri; Nuring Hayati, Nunung; Novi Listyawati, Ratih
MATRAPOLIS: Jurnal Perencanaan Wilayah dan Kota Vol. 5 No. 1 (2025): Vol. 5 No. 1 (2025)
Publisher : Program Studi Perencanaan Wilayah dan Kota, Universitas Jember

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Abstract

Probolinggo Regency is one of cities in Indonesia located on the north coast of Java which has a relatively flat and plain. This condition causes Probolinggo to hava a potential for various disaster risks, one of which is tidal flooding. The three sub-districts that are areas with the highest intensity of tidal flooding are Kraksaan District, Paiton District and Gending District. The coastal area in Kraksaan District, Probolinggo Regency is a lowland with an altitude of 0-100 m above sea level which is prone to tidal flooding. The tidal flood incident in Kraksaan District mostly inundated Kalibuntu Village which is a fishing village and has the highest population density of 7,989 km2 (BPS Probolinggo Regency, 2020). Many community business areas were inundated by tidal flooding such as 496.80 ha of ponds which caused crop failure for pond farmers, community rice fields covering an area of 311.12 ha caused damage to the commodities planted (Pratama et al, 2017). These losses will have a negative impact on the sustainable livelihoods of people living on the coast if tidal floods continue to occur repeatedly. Based on these conditions, it is necessary map disaster vulnerability using 4 vulnerability parameters, namely physical, social, economic and environmental vulnerability. Areas with high vulnerability due to very high population and settlement density can cause the area to be vulnerable to disasters. After the level of vulnerability is known, an assessment of the resilience of the Kalibuntu coastal area to tidal flood disasters will be carried out by several selected respondents using the ANP (Analitycal Network Process) method with the final output is determining priority criteria and selecting the best alternatives that can be used as recommendations for increasing the resilience of Kalibuntu coastal area to tidal flood disasters. The main priority in increasing the resilience of Kalibuntu coastal area is optimizing the improvement of tidal flood mitigation infrastructure.
An Improving Service Quality Using Servqual With 3 Fuzzy Numbers : A Study in ITESA Muhammadiyah Semarang Tarita Intan Soraya; Ratri Wulandari; Wellie Sulistijanti; Wulan Bhakti Pertiwi; Muhammad Sulthan Madany
JURNAL RISET RUMPUN MATEMATIKA DAN ILMU PENGETAHUAN ALAM Vol. 4 No. 2 (2025): Agustus: Jurnal Riset Rumpun Matematika dan Ilmu Pengetahuan Alam
Publisher : Pusat riset dan Inovasi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/jurrimipa.v4i2.6194

Abstract

Ensuring the delivery of high-quality public services within educational institutions is a critical factor for sustaining student satisfaction, institutional reputation, and overall organizational credibility. Service quality in higher education is often multidimensional and subjective, making its evaluation a challenging process. To address this complexity, the present study integrates the traditional Servqual model with fuzzy logic in order to handle the uncertainty and vagueness associated with human perceptions. The Servqual framework emphasizes five core dimensions of service quality, namely tangibles, reliability, responsiveness, assurance, and empathy, which together provide a comprehensive understanding of institutional service performance. The research was conducted at ITESA Muhammadiyah Semarang, where data collection was carried out through structured questionnaires designed to measure both student expectations and actual perceptions regarding institutional services. In order to capture the imprecise nature of these responses, three types of fuzzy numbers—triangular, trapezoidal, and shoulder fuzzy numbers—were applied to convert the linguistic assessments into measurable values. Subsequently, fuzzy gap analysis was performed to evaluate the discrepancy between expectations and perceptions across the five Servqual dimensions. The results of this analysis highlight that the integration of fuzzy logic into the Servqual model provides a more nuanced and flexible framework for assessing service quality compared to the conventional approach. It reduces the ambiguity in interpreting survey responses, thereby yielding more reliable insights into areas where service performance falls short of expectations. Furthermore, the study demonstrates that each dimension contributes differently to overall satisfaction, with responsiveness and assurance emerging as critical aspects requiring attention. In conclusion, the fuzzy-based Servqual model offers a robust methodological advancement in evaluating service quality within educational settings. The findings not only inform institutional leaders about current performance gaps but also provide actionable insights for continuous quality enhancement, policy formulation, and strategic decision-making to strengthen institutional competitiveness and credibility.
EXTREME RAIN AND FLOOD RISK: CAN WE SEE IT COMING? Misshuari, Imas Wihdah; Wulandari, Ratri; Bin Salim, Mohd Razman
INDONESIAN JOURNAL OF CONSTRUCTION ENGINEERING AND SUSTAINABLE DEVELOPMENT (CESD) Vol 8 No 1 (2025): INDONESIAN JOURNAL OF CONSTRUCTION ENGINEERING AND SUSTAINABLE DEVELOPMENT (CESD)
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/cesd.v8i1.24138

Abstract

Climate change has significantly altered rainfall patterns, increasing the frequency of extreme rainfall events that have a major impact on infrastructure resilience and water resource management. This study aims to predict the recurrence period of extreme rainfall in Asahan Regency, North Sumatra, using the Gumbel distribution. The data used is annual maximum rainfall. The data was sorted, and its probability was calculated using the Weibull formula, then converted to Gumbel-z values. These values were used in a linear regression model to determine the location (μ) and scale (β) parameters of the distribution. The calculations were performed manually and using Python to ensure accuracy. The analysis results showed a strong negative correlation between maximum rainfall and Gumbel values, with R² = 0.742, indicating the reliability of the model in predicting extreme events. The Gumbel distribution proved to be effective in estimating the recurrence period of extreme rainfall. These findings offer vital perspectives on disaster mitigation, infrastructure planning, and sustainable water management in Asahan Regency. This predictive model plays an important role in hydrological planning and flood risk reduction in the region.
Pendampingan Literasi Dasar Oleh Mahasiswa PAI Sebagai Solusi Mengatasi Kesulitan Membaca Siswa di SD Petung Kabupaten Kendal Karkauni, Biki Sabili; Kholifah, Wulan Riska; Wulandari, Ratri
Jurnal Riset Pendidikan Multidisiplin dan Pengabdian Kepada Masyarakat Vol. 1 No. 3 (2025): Oktober-Nopember
Publisher : SMA Negeri 1 Bangkinang Kota

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jrppm.v1i3.73

Abstract

Bagi setiap anak literasi menjadi sebuah kemampuan dasar yang sangat penting untuk dimiliki, khususnya pada mereka yang duduk di jenjang sekolah dasar. Seperti yang kita ketahui literasi tidak hanya berkaitan dengan kemampuan anak dalam membaca dan menulis, melainkan jga mencakup bagaimana anak dapat memahami, mengolah, serta menggunakan informasi secara efektif dalam kehidupan sehari-hari mereka. Terutama bagi anak dalam jenjang Sekolah Dasar, yang dimana literasi menjadi pondasi utama dalam proses belajar, karena dalam pemeblajarannya disekolah, hampir seluruh kegiatan berawal dari kemampuan membaca dan memahami teks. Dalam hal ini, literasi berperan dalam membentuk karakter dan pola pikir anak, dalam mengenal berbagai nilai moral, budaya, dan ajaran agama anak anak bisa melakukannya melalui kegiatan membaca. Khususnya diera digital saat ini, dimana literasi tidak hanya soal memahami buku cetak, tetapi juga bagaimana anak memiliki kemampuan dalam memahami informasi dari berbagai sumber media digital. Dimana menjadi perlu,] bagi sekolah ataupun bagi orang tua dalam berkoloborasi untuk menanamkan budaya literasi melalui kegiatan yang menyenangkan. Penelitian ini disusun berangkat dari fenomena rendahnya kemampuan belajar siswa, di SD Petung Kab. Kendalm khususnya dalam aspek literasi. Masih banyaknya siswa yang mengalami kesulitan dalam mengenal huruf, membaca kata, hingga memahami isi bacaan yang sederhana. Kondisi inilah yang menjadi latar belakang yang sangat penting bagi mahasiswa untuk dapat melaksanakan kegiatan pendampingan belajar sebagai bagian dari program Kuliah Kerja Nyata (KKN). Dalam pendampingan ini mahasiswa Pai tidaklah hanya berperan menjadi seorang pengajar, namun juga sebagai seorang fasilitator yang dapat membantu siswa dalam menemukan cara belajar yang menyenangkan serta bermakna. Melalui pendekatan edukatif dan religius, seperti penggunaan media pembelajaran interaktif, pembacaan kisah Nabi atau Islami, serta beberapa permainan edukatif yang nantinya diharapkan oleh mahasiswa mampu menumbuhkan semangat belajar dan meningkatkan pemahaman siswa terhadap materi dasar. Kesimpulan penelitian menegaskan bahwa melalui program Kuliah Kerja Nyata ini, peluang besar bagi mahasiswa guna meningkatkan masyarakat yang berakhakul karimah serta masyarakat yang berdaya memalui kerja nyata yaitu meningkatkan kesadaran literasi bagi anak-anak di lingkungan Desa Petung Kab. Kendal.
Pengukuran Efektivitas Penggunaan Anggaran Pendidikan Marwiyah, Syaibatul; Wulandari, Ratri; Sihite, Yanti Dameria; Zulkipli, Muhammad; Pohan, Agus Salim
EDU SOCIETY: JURNAL PENDIDIKAN, ILMU SOSIAL DAN PENGABDIAN KEPADA MASYARAKAT Vol. 4 No. 3 (2024): Oktober 2024-Januari 2025
Publisher : Association of Islamic Education Managers (Permapendis) Indonesia, North Sumatra Province

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56832/edu.v4i3.530

Abstract

Anggaran biaya pendidikan menjadi hal penting dalam perencanaan tahunan pengelolaan pendidikan. Sebab, penyelenggaraan seluruh aktivitas lembaga pendidikan membutuhkan rincian anggaran. Lebih lanjut, dimaksudkan untuk kesesuaian sumber daya manusia dan pemberdayaan sumber daya lainnya yang ada di sekolah. Penelitian ini bertujuan mendeskripsikan pengukuran efektivitas penggunaan anggaran pendidikan. Untuk menganalisis topik tersebut, maka digunakan pendekatan kualitatif dengan metode studi kepustakaan. Proses pengumpulan data dan pengecekan keabsahan menggunakan data dari sumber kredibel, meliputi Google Scholar, SINTA, dan DOAJ. Hasil penelitian ini menyimpulkan bahwa jumlah korupsi di sektor pendidikan harus dianggap sebagai masalah yang mengkhawatirkan. Selain itu, diyakini bahwa jumlah kasus yang telah ditindak aparat penegak hukum (APH) lebih kecil daripada tingkat perilaku koruptif dan pemborosan anggaran yang sebenarnya terjadi. Semakin banyak kasus, semakin besar kerugian negara, dan layanan pendidikan dan pengembangan sumber daya manusia menjadi lebih buruk. Selain itu, pendidikan adalah sumber penting yang sangat mempengaruhi sikap dan karakter seseorang.
Co-Authors Addin Trirahmanto Adrin, Athaya Fatharani Agnia Lutfiah Salsabila Alfiansyah, Igit Rizki Almas, Puspa Alifah Andrianawati, Aida Aniq Atiqi R Annisa Aditsania Ardhanu Kusumanto Arnanti Primiana Yuniati Asep Mulyana Aufarin Aubin Aulia Fiya Maulida Bambang Irawanto Bayu Surarso Bin Salim, Mohd Razman Boby Herafandy Suyono Desty Istiqomalia Desty Istiqomalia Djoko Murdowo Eka Sulistiyowati Fajriani, Mediva Dyah Fathma Dzakiyah Annuroni Febrina Amalia Nur Aqmarina Hapsoro, Nur Arief Idhar Resmadi Imas Wihdah Misshuari Irnade Salva Sutyaningsih Istiawan, Deden Juwanda, Farikhin Karkauni, Biki Sabili Khania Alikha Sari Kholifah, Wulan Riska Laksita, One Triska Lisda Fadhilah Mahendra Nur Hadiansyah Manurung, Leony Teresia Marwiyah, Syaibatul Maulida, Aulia Fiya Mediva Dyah Fajriani Muhammad Sulthan Madany Nadila Rindy Antika Putri Nelsa Siti Nurhaliza Novi Listyawati, Ratih Nuring Hayati, Nunung Nurul Adawiyah Pohan, Agus Salim Prabasworo, Bhanu Putu Harry Gunawan Rahmat Lutfi Guefara Randy Pandita Bastari Rendy Pandita Rendy Pandita B Rezky Diningrat Khan Safi Nur Indahsari Sari, Virgania Sesilia Windy Carena Shidqi Alia Taufiq Shinta Nur Arafah Sidik Sihite, Yanti Dameria Siti Saadah Sri Soedewi Sulistijanti, Wellie Sutyaningsih, Irnade Salva Syahida, Arifah Nur Tantri Wilasari Tarita Intan Soraya Titian Sarihati Togar Mulya Radja Vika Haristianti Wibisono Tegar GP Wibowo, Tophan Heri Windyaning Ustyannie Wulan Bhakti Pertiwi Yanfa Alnur Fajri Yudono, Danang Tri Zulfa lailatul Izzah Zulkipli, Muhammad