bluuebunny/crossref_metadata_2025 huggingface dataset:
Qualitative and Quantitative Assessment of the Regenerate Bone Formed During Intramedullary Limb Lengthening Using a Goat (Caprine) Tibia Model: A Pilot Study
Authors: Bafor Anirejuoritse , Isler Aidan , Sprangel Kell , McBride-Gagyi Sara , Iobst Christopher A.
Published: January 2025

Introduction:

With the increasing popularity of intramedullary limb lengthening, it has been observed that the regenerate bone formed during this process appears visually different from the regenerate bone formed during extramedullary limb lengthening using external fixators. Using a goat tibia model, this pilot study is the first to evaluate the regenerate bone formed from intramedullary limb lengthening comprehensively.

Materials and Methods:

After a magnetically driven internal lengthening nail was inserted, a 2 cm lengthening of the goat tibia was performed. The regenerate bone formation was assessed using plain radiographs and micro-computed tomography (CT). An analysis of the regenerate bone mineralization was also measured using micro-CT. Histology of the regenerate bone using hematoxylin and eosin staining provided additional descriptive analysis.

Results:

Regenerate bone appeared as early as the 2nd–4th week of distraction and progressed from the periphery to the center as well as from the bone ends toward the center of the regenerate, delineating a distinct fibrous interzone and a previously undescribed “inner zone.” Bone formation and maturation were fastest on the posterior cortex. Histology showed evidence of both intramembranous and endochondral ossification.

Conclusions:

Our findings outline the pattern of bone formation during intramedullary lengthening. In addition, the discovery of a previously unreported fibrous “inner zone” is described.
Incidence of Congenital Limb Reduction Defects: A Systematic Review
Authors: Levesque Gabrielle , Reddi Renitha , Chhina Harpreet , Elliott Alison M. , Pawliuk Colleen , Bone Jeffrey , Cooper Anthony
Published: January 2025

Background:

Congenital limb reduction defects (CLRDs) are missing or hypoplastic whole or part of limbs that occur in utero and cause significant functional impairment. This systematic review aims to describe the incidence of CLRDs published to date in the English literature.

Methods:

A systematic review was performed using Ovid Medline, Ovid Embase, Web of Science, and Google Scholar in April 2021. Two independent reviewers performed title and abstract screening, full-text review, and data extraction. Conflicts were resolved by a third independent reviewer. The pooled incidence rate per 10,000 was calculated.

Results:

Search results were performed on April 10, 2021. 2076 articles were screened, 288 studies underwent full-text review, and 100 papers were included for final data analysis. The average pooled incidence of CLRDs was 4.48/10,000 (95% confidence interval = 3.89–5.16) with the highest incidence in Western Asia and the lowest in Eastern Asia. There was a higher incidence of upper limbs, males, and left-sided defects. Incidence has decreased over time (−0.0103, 95% CI = −0.203–−0.003, P = 0.04).

Conclusions:

The incidence of CLRDs published in the English literature to date was calculated, outlining the importance of screening, standardized classification system, and healthcare resource requirements.
Health-related Quality of Life in Patients with Achondroplasia after Global Limb-lengthening Surgery: A Case Series
Authors: Ginebreda Ignacio , Ibáñez Maximiliano , Canu Nicole , Echavarria Carolina , Lebre Joana , Pérez Miriam
Published: January 2025

Background:

Achondroplasia can impact daily activities and impair quality of life (QoL). Surgical lengthening of the upper and lower limbs has been reported to increase independence and improve QoL, but further evidence is needed to allow well-informed treatment decisions. Question/Purpose: (1) What height and limb-length improvements are achieved with global limb-lengthening surgery? (2) Does global limb-lengthening surgery improve patient QoL? (3) What major complications are observed with global limb lengthening?

Subjects and Methods:

This retrospective case series reviewed patients with achondroplasia who underwent global (tibial, femoral, and humeral) elongation between 1986 and 2012 at our institution. Patients were followed for 3 years postoperatively to measure gains in height and limb length. Postelongation QoL was assessed with the 36-item short form health survey (SF-36) and compared with a historical nonsurgical control group.

Results:

After global lengthening in 35 patients (210 segments), mean increases in limb length (right and left, respectively) were 15.0 and 15.3 cm for the tibia, 14.1 and 14.1 cm for the femur, and 10.8 and 10.9 cm for the humerus, gaining in average 29 cm from lengthening the lower extremities. When compared with a control group (short stature who did not receive limb-lengthening surgery [n = 44]), our patients reported significantly higher mean scores across all eight SF-36 subscales (P < 0.0001 for all subscales). Major complications were reported for 62.2% of patients, most commonly valgus axial deviation of the tibia (both tibias in 24.3%), early consolidation of the tibia (8.1%), and postelongation fracture of the femur (8.1%).

Conclusion:

Global limb lengthening achieved significant improvements in patient-reported functional and emotional QoL compared with historical nonsurgical controls and an acceptable rate of major complications.
Combination Treatment with Methotrexate for Severe Alopecia Areata
Authors: Pamin Joanne Abigail Rellera , Quinio-Calayag Ma. Franchesca S. , Santos Ana Aurelia M.
Published: January 2025

Alopecia areata (AA) is an autoimmune disorder that is mediated by CD8 T-cells. It presents as nonscarring round patches of hair loss that may become diffuse. It has bimodal incidence, but rarely presents in young adults. In the Philippines, AA prevalence is about 1.8% for both genders. To the best of our knowledge, there are no other publications in the Philippines documenting the successful management of severe diffuse AA with combination corticosteroids and methotrexate while addressing developed side effects. Beyond demonstrating efficacy of combination treatment, it is our interest to highlight the relevance of traditional therapies in the era of newer treatments. This is a case of a 20-year-old female with 2 months of progressive hair loss patches over the scalp. Dermoscopy and biopsy confirmed a diagnosis of diffuse AA. Treatment included a combination of corticosteroids, methotrexate, and supplementation. Significant hair regrowth from Severity of Alopecia Tool score of 92% to 0.1% was observed after 6 months of therapy. While newer therapies such as Janus kinase inhibitors offer promise, the affordability and effectiveness of traditional treatments remain essential, particularly in regions with limited access to advanced therapies. The successful management of severe diffuse AA with combination corticosteroids and methotrexate underscores the importance of tailored treatment approaches. This case highlights the need for continued research into optimal treatment strategies for AA, ensuring that patients receive safe, affordable, and effective care tailored to their individual needs.
Epidermolytic Ichthyosis Treated with Low-dose Isotretinoin
Authors: Olivar-Floro Nica Minerva Quijalvo , Go Janelle Geronimo
Published: January 2025

Affecting only 1 in 200,000–300,000 persons worldwide, epidermolytic ichthyosis (EI) is a rare autosomal dominant genodermatosis presenting with a characteristic phenotype of generalized corrugated scaling. We report a case of EI highlighting significant improvement in clinical outcomes and quality of life. A 27-year-old Filipino male sought to consult for generalized foul-smelling “wood bark” like scaling since early childhood. Histologic findings confirmed EI. The condition was managed with hydration, lubrication, keratolysis, and low-dose isotretinoin (0.5 mg/kg/day). Clinical outcomes, measured using the visual index for ichthyosis severity scoring and dermatology life quality index, revealed significant improvement. EI is a rare life-long disease of cornification which can severely incapacitate the person affected. Given the limited cases, this case report supports the efficacy of oral isotretinoin in its treatment. The recovery in the cosmetic and functional capacity parallels the upliftment of psychosocial burden. Overall, the management led to an improvement in the quality of life.
Amelanotic Melanoma Mimicking Squamous Cell Carcinoma
Authors: Solis Ianne Robin Dumawal , Lorena Philip Cedrick Lacsamana , Paz-Lao Ma. Purita Gela , Jamora Maria Jasmin Jacinto , Songco Julie Anne Patricia Magsino
Published: January 2025

We report on a patient diagnosed with amelanotic melanoma that presented with dermoscopic and histological features resembling squamous cell carcinoma. The patient was referred for Mohs micrographic surgery and subsequent reconstruction. Immunohistochemical stains were requested demonstrating strongly positive staining for melanoma antigen recognized by T cells 1 and negative results for pancytokeratin and carcinoembryonic antigen. These findings confirmed the diagnosis of amelanotic nodular melanoma, Stage IIC (T3bN0M0), highlighting the importance of accurate diagnostic techniques in guiding appropriate clinical management strategies.
Bullous Skin Lesions as a Presentation of Calcific Uremic Arteriolopathy (Calciphylaxis) in a 52-year-old Filipino Female with Chronic Kidney Disease on Renal Replacement Therapy
Authors: Trigo John Christian Alvarez , Go Adrian Eleazar , Flordelis Farah Ana Altarejos , Reyes Jan Gabrielle M. , Judilla Jon Steven T. , Ratag Danielle Diane E. , Yap Lexia Libertine H. , Delica Hanne Dorothy G. , Pongase Kate P. , Alcantara Alexia Robiso , Paigan Andrew Jean-Allan Vallespin , Ceño Rhimart T.
Published: January 2025

Calcific uremic arteriolopathy is a rare condition characterized by arteriolar calcification of the cutaneous vessels – leading to thrombosis, infarction, and ischemia. Atypical presentations have been reported in some case reports, often eluding diagnosis and delaying interventions. This is a case of a 52-year-old Filipino female with end-stage renal disease admitted for empyema thoracis, subsequently presented with multiple tender serous bullae evolving into retiform purpura of the lower extremities. Nikolsky and Asboe-Hansen signs were negative. Serum chemistries revealed hyperphosphatemia, normocalcemia, and elevated parathyroid hormone. Radiographic examination of bilateral lower extremities showed small vessels and arterial calcification. Histopathology revealed focal subcutaneous calcification. Intravenous infusion of sodium thiosulfate and pentoxifylline was started, with clinical improvement; however, the patient expired due to complications of uremia. With bullous lesions in the setting of end-stage kidney disease, atypical presentation of calciphylaxis must be considered. Rapid recognition and treatment are keys to preventing morbidity and mortality.
Severe Cutaneous Adverse Reactions: A Narrative Literature Review
Authors: Preclaro Ivan Arni Caballero , Liwag Kristine Ida L. , Tabalon-Morales Michaela , Iniego-Rodas Ma. Corazon
Published: January 2025

Severe cutaneous adverse reactions (SCAR) are the rare conditions associated with medication use. This includes Stevens-Johnson syndrome, toxic epidermal necrolysis, drug reaction with eosinophilia and systemic symptoms, acute generalized exanthematous pustulosis and generalized bullous fixed drug eruption. These diseases present with various vivid cutaneous manifestations associated with systemic symptoms and may cause potential mortality. It is classified as a delayed-type hypersensitivity with different cell mediators depending on its clinical phenotype. Genetic factors seem to have a role in the interaction of the culprit drug and the host’s immune system. This narrative review aims to describe the clinical manifestations of different SCAR, to review its pathomechanism, diagnosis and management, and to stipulate its future directions in the Philippines.
Proseal laryngeal mask airway and endotracheal intubation in lower abdominal gynecological surgeries for perioperative gastric volume assessment and assessing postoperative recovery of gastrointestinal functions: A randomized controlled trial
Authors: Mahaseth Ranjay , Gupta Bhavna , Jain Gaurav , Bahadur Anupama , Singla Deepak , Tripathy Debendra K.
Published: January 2025

Background:

In the context of perioperative care, the concern of gastric content aspiration during surgical procedures is crucial, though relatively rare. Supraglottic devices after the creation of pneumoperitoneum and positive pressure ventilation may cause gastric insufflation. This study explores the unique aspects of antral cross-sectional area (CSA) measurement as a novel indicator in comparing the use of ProSeal laryngeal mask airway (LMA) and endotracheal intubation in airway management during lower abdominal surgeries and assessing postoperative recovery in both the groups.

Methods:

The study commenced after obtaining approval from Institutional Ethical Committee (IEC number-AIIMS/IEC/22/251 Date: 27/05/2022) and after registration in Clinical Trials Registry - India (CTRI) (CTRI/2022/07/044102 Registered on: 18/07/2022) and was conducted from August 2022 to August 2023. A total of 72 ASA I and II participants were included in two groups: endotracheal tube (ETT) (Group E) and PLMA (Group P). The primary outcome was the antral CSA, and secondary outcomes included hemodynamic and respiratory parameters, time to start clear fluid, light diet, and length of stay.

Results:

Our results showed that there was no statistically significant difference between the two groups in antral CSA at various time intervals. The hemodynamic variables were significantly higher in the endotracheal tube group (P < 0.0001). The absence of significant differences in time to start clear liquids, time to start a light diet, and time to achieve bowel movements between the ETT and PLMA groups suggested that both airway management techniques are equally safe in facilitating postoperative recovery concerning gastrointestinal functions.

Conclusions:

Patients who underwent minimally invasive lower abdominal surgeries, choice of airway management technique, whether ETT or PLMA, did not substantially impact antral CSA, vital parameters, respiratory parameters, or postoperative recovery.
Comparing the priming methods of anesthesia circuits using passive and ventilator-assisted techniques—An exploratory study
Authors: John Indragandhi , Ramaraj Krishnaprabu , Devasagayam Booma
Published: January 2025

Background and Aims:

Priming the breathing circuit with a volatile agent plays a major role in inhalational induction. It depends on the fresh gas flow rate (FGF), concentration setting of the volatile agent, and time taken to attain the desired end-tidal concentration. The aim of the study is to compare ventilator-assisted priming (VAP) and a passive priming technique using different fresh gas flows (FGFs) in neonatal, pediatric, and adult anesthetic circuits with sevoflurane vaporizer.

Methodology:

An exploratory study was conducted on a single Datex ohmeda GE Inc. workstation using three different circuits. In both techniques, FGF with 100% oxygen and 8% sevoflurane vaporizer concentration was set at 2 L/min, 4 L/min, and 8 L/min corresponding to their three groups FGF-2, FGF-4, and FGF-8, respectively. The time taken to achieve 6% sevoflurane concentration at the patient end of the circuit was measured. In this study, we have explored various combinations of tidal volumes, respiratory rates with three different fresh gas flows, and their priming time with sevoflurane consumption.

Results:

The minimum time required to prime neonate, pediatric, and adult circuits using the ventilator-assisted technique to attain end-tidal sevoflurane 6% is 29 seconds, 39 seconds, and 61 seconds with 2 L/min FGF. Their corresponding sevoflurane consumptions are 0.25 ml for the neonate circuit, 0.78 ml for the pediatric circuit, and 2 ml for the adult circuit.

Conclusion:

The ventilator-assisted priming technique is an effective and quick method to attain end-tidal sevoflurane 6% with low FGF (2 L/min), low tidal volume (100 ml), maximum respiratory rate (20), and minimal sevoflurane consumption when compared to the passive priming technique.
Extensive supraglottic mass—An anesthetist’s nightmare
Authors: Hebbar K Chethan , Nagarajappa Abhishek , Chandramouli M , Anvi
Published: January 2025

Supraglottic carcinoma presents significant challenges in airway management during general anesthesia. We report a case of a 26-year-old female with extensive supraglottic growth undergoing a biopsy. Awake fiber-optic intubation was performed due to the risk of airway obstruction and difficulty with direct laryngoscopy. Upper airway anesthesia was achieved with nebulized lignocaine and the spray-as-you-go technique. Successful intubation was followed by an uneventful surgical procedure and a smooth recovery. This case highlights the efficacy and safety of awake fiber-optic intubation in managing difficult airways in patients with supraglottic tumors, minimizing complications and enhancing patient outcomes.
Regional anesthesia and muscle-wasting diseases in pediatrics: A focused educational review
Authors: Elhamrawy Amr , Elmitwalli Islam , Burrier Candice , Veneziano Giorgio , Tobias Joseph D.
Published: January 2025

The muscular dystrophies or muscle-wasting diseases include a diverse group of genetic disorders, which result in progressive degeneration of skeletal muscles, progressive muscle weakness, and comorbid multi-system involvement. Duchenne muscle dystrophy is the most common type of muscular dystrophy with a reported incidence of 1 in every 3500–6000 male live births in the United States. Given the progressive nature of these disorders, skeletal muscle weakness frequently progresses to loss of the ability to ambulate and perform functions of daily life. In addition to affecting the skeletal musculature, many muscular dystrophies have effects on both cardiac and smooth muscles. As respiratory muscles are one of the most frequently affected muscles in patients with muscular dystrophies, progressive respiratory insufficiency may occur with dependance on non-invasive forms of respiratory support. Given the progressive multi-system involvement associated with the muscular dystrophies, perioperative care and the use of general anesthetic agents and opioids may result in postoperative respiratory failure. In an effort to avoid the deleterious effects of anesthetic agents and opioids on hemodynamic and respiratory functions, regional anesthesia may be used as an adjunct to or instead of general anesthesia. This manuscript provides a literature review and educational summary regarding the use of regional anesthetic techniques in pediatric-aged patients with muscular dystrophies.
Edukasi Persiapan Psikologi Pada Wanita Usia Subur Untuk Masa Prakonsepsi
Authors: Kadir Arisna , Dahniar Dahniar , Purnama Sari Lili , Hasnaeni Hasnaeni , Firawati Firawati
Published: January 2025

Data from the World Health Organization (WHO) shows that around 10% of pregnant women and 13% of new mothers experience mental disorders, especially depression. In developing countries this figure is even higher, at 15.6% during pregnancy and 19.8% after childbirth. To prevent similar cases, it is necessary to prepare for pregnancy which can be done during the preconception period, namely the treatment period before pregnancy occurs with a time span of three months to one year before conception. Therefore, Education on Psychological Preparation of Women of Fertile Age for Preconception Preparation at the Bara-Barayya Health Center through community service activities is considered necessary with the aim of changing the views of women of childbearing age and families related to psychological health and behavior that can affect it as an effort to prepare for preconception. The method used was lecture and question and answer. The participants who attended the counseling consisted of 23 people where the post-test evaluation showed the participants' better understanding of efforts to maintain mental health can help mothers prepare for pregnancy in the preconception period. Conclusion: counseling participants, namely women of childbearing age, understand the importance of psychological preparation during the preconception period
ANALISIS KESALAHAN SISWA DALAM MENYELESAIKAN SOAL EKSPONEN BERDASARKAN PROSEDUR NEWMAN
Authors: Khoirunnisa Fita , Utami Rini
Published: January 2025

This research aims to determine the types of errors made by students when working on exponent problems. Apart from that, research also analyzes the factors that cause mistakes made by students. Errors in working on questions consist of reading errors, understanding errors, transformation errors, processing errors and errors in writing the final answer. This research uses descriptive qualitative data analysis. Research subjects were determined using purposive sampling techniques. The research results showed that students made errors in understanding, transformation errors, process errors and errors in writing the final answer. The factors that cause this are students being in a hurry to work on questions, students also being unable to continue the process of working on questions because students do not understand the material and students are not careful in working on questions
ESTIMASI PARAMETER DARI DISTRIBUSI LOMAX MENGGUNAKAN METODE BAYESIAN ENTROPY LOSS FUCTION
Authors: Sani Ridha Fadhila , Yanuar Ferra , Devianto Dodi
Published: January 2025

The purpose of this research is estimating shape parameter (θ) of  Lomax distribution with known shape parameter (β). Estimating parameter of Lomax Distribution using Bayesian Entropy Loss Function method with Gamma prior as conjugate prior of parameter (θ). The data used in this research is generated data which is obtained from R-Studio. Estimating parameter with Bayesian Entropy Loss Function Method from Lomax distribution with used shape parameter (θ=1) is  and estimating parameter with Bayesian Entropy Loss Function Method from Lomax distribution with used shape parameter (θ=1,5) is . Estimating shape parameter (θ) will be evaluated used AIC, AICc, and BIC method
ANALISIS KEMAMPUAN KONEKSI MATEMATIS SISWA DALAM MENYELESAIKAN MASALAH KONTEKSTUAL PADA MATERI SISTEM PERSAMAAN LINEAR DUA VARIABEL
Authors: Hamzah Nurliya , Abdullah Abdul Wahab , Pauweni Khardiyawan A.Y.
Published: January 2025

Connections in mathematics refer to linking mathematical concepts with other sciences and their application in everyday life situations. Solving mathematical problems related to context can be used to develop and assess students' mathematical abilities in making connections. This research aims to describe how junior high school students use mathematical connection abilities in solving predetermined contextual problems. The research method used is descriptive qualitative. Data was collected through initial ability tests and mathematical connection tests and interviews. The research results show that students with high mathematical abilities tend to be able to make mathematical connections by building mathematical models, link concepts conceptually by connecting elements in SPLDV, and operate mathematical procedures correctly. However, mathematical connections are rarely made because students do not understand the solution methods. Students who have low mathematical abilities, in general, are not able to make connections according to connection indicators. So, the conclusion is that students' ability to make mathematical connections affects their ability to solve contextual mathematical problems.
PEMETAAN AREA DI PROVINSI JAWA BARAT INDONESIA BERDASARKAN FAKTOR-FAKTOR YANG BERKONTRIBUSI PADA KEJADIAN DEMAM BERDARAH DENGUE
Authors: Hendrawati Triyani , Putri Samsi Haana Lahanda , Munawwaroh Ihksa
Published: January 2025

Dengue haemorrhagic fever (DHF) is endemic in major cities in Indonesia. West Java Province is one of the provinces in Indonesia with a high number of DHF cases every year. To minimise the spread and increase of DHF cases can be done by controlling the factors that influence it. This study aims to categorise cities/districts in West Java based on factors that influence DHF cases. The data used are population density (Soul/ ), proper sanitation (%), healthy and clean living behaviour (%), access to proper water sources (%), and health index (%) in 27 cities/districts in West Java in 2021. In this study, the method used is the Hierarchical clustering method; namely the single linkage method, the complete linkage method, the average linkage method, and the ward method. The clustering methods are then compared based on the value of their standard deviation. The analysis results show that the best method used is the complete linkage method. The results of clustering areas in West Java based on factors affecting dengue cases obtained three clusters. Cluster 1 is the cluster with the highest level of dengue cases compared to other clusters. Cluster 1 consists of Depok city, Bogor city, Cirebon city, Bandung city, and Cimahi city. The characteristic of cluster 1 is that it has the highest average population density compared to other clusters. Cluster 2 consists of Cirebon, Bekasi, Banjar City, Bogor, Bandung, Karawang, West Bandung, Purwakarta, Kuningan, Majalengka, Pangandaran, Indramayu, Garut, Ciamis, Subang, Sukabumi, Cianjur, Tasikmalaya, and Sumedang. Cluster 2 has the characteristics of having the highest average percentage of households with access to proper sanitation, percentage of households with clean and healthy behaviour, and health index. Cluster 3 is Sukabumi City and Tasikmalaya City. Cluster 3 has characteristics with the lowest average in the percentage of households that have access to proper sanitation and the percentage of households with clean and healthy behaviour.
ANALISIS BIFURKASI DINAMIKA POPULASI PENGRAJIN SONGKET DALAM MENJAGA EKSISTENSI KERAJINAN SONGKET PANDAI SIKEK
Authors: Adryan Muhammad Rizki , Winanda Rara Sandhy
Published: January 2025

Songket is called the "Queen of Textiles" because of its beauty and luxury, combined with the sparkle of gold and silver threads, is one type of textile. However, the selling value and economic potential of songket in Nagari Pandai Sikek are not in line with the number of craftsmen. This phenomenon was analyzed using mathematical modeling, focusing on local stability. As a result, three equilibrium points were found. The first equilibrium point describes a state in which there are only potential craftsmen. Meanwhile, the second equilibrium point indicates the presence of potential craftsmen, proficient craftsmen aged 18-35 years, and professional craftsmen, but no proficient craftsmen over 35 years old. At the third equilibrium point, there are potential craftsmen, proficient craftsmen over 35 years old, and professional craftsmen, but there are no proficient craftsmen aged 18-35 years. Bifurcation analysis shows that if the value is ,, then the songket craftsmen can still survive. However, if it is  the songket craftsmen will experience rapid decline and will slowly become extinct
EKSPLORASI ETNOMATEMATIKA PADA JAJANAN TRADISIONAL KHAS BANDUNG
Authors: Farida Nur , Nurhayati Nurhayati , Ariyanto Saring
Published: January 2025

The purpose of this research is to explore the ethnomathematics found in traditional Bandung snacks. Additionally, the author hopes that readers will gain a better understanding of this ethnomathematics. This research was conducted in several locations in the Bandung area. The research method used to explore this ethnomathematics is a descriptive qualitative method, with data collection through observation, interviews, and documentation. The research instruments used were observation sheets and interview guides. After exploring the ethnomathematics in traditional Bandung snacks, the author concluded that these traditional snacks are a rich heritage that must be preserved. The research results show the presence of cultural philosophy and mathematical concepts such as ratios and geometry of plane and solid shapes in traditional Bandung snacks
IMPLEMENTASI METODE ACCELERATED LEARNING DALAM PEMBELAJARAN MATEMATIKA UNTUK MENINGKATKAN KEMAMPUAN PENALARAN MATEMATIS SISWA SMA
Authors: Fitriani Meida , Mahuda Isnaini
Published: January 2025

This study aims to: (1) examine the differences in the improvement of mathematical reasoning abilities between students who receive instruction using the Accelerated Learning method and those who receive instruction using conventional methods; (2) determine students' responses to mathematics instruction using the Accelerated Learning method. The research method employed is a quasi-experimental method with a non-equivalent control group design. This study was conducted in one of the public high schools in Cimahi, involving tenth-grade students during the 2010/2011 academic year. The instruments used included instructional tools such as syllabi, lesson plans, and student worksheets; and data collection instruments such as mathematical reasoning ability tests, observation sheets, student daily journals, and questionnaires. The results of the study indicate that (1) there are differences in the improvement of mathematical reasoning abilities between students who received instruction using the Accelerated Learning method and those who received instruction using conventional methods. Furthermore, it can be stated that the improvement in mathematical reasoning abilities of students who received mathematics instruction through the Accelerated Learning method is higher than that of students who received mathematics instruction through conventional methods; (2) most students responded positively to mathematics instruction using the Accelerated Learning method.
EKSPLORASI ETNOMATEMATIKA PADA MAKANAN TRADISIONAL KERAK TELOR SEBAGAI MEDIA BELAJAR MATEMATIKA KURIKULUM MERDEKA
Authors: Della Sandy Puspita , Rahmawati Eva Yuni , Luthfiyah Rifa Zahra , Habiba Restu Nur , Nafisa Sayyida
Published: January 2025

Ethnomathematical exploration of the traditional food kerak telor is a study that explores the relationship between mathematics and culture in a traditional culinary context. Mathematics learning includes the need for a learning approach that is contextual and relevant to local culture to increase students' interest and understanding of mathematics. The aim of this research is to reveal the mathematical patterns contained in the process of making, measuring and distributing egg crusts, as well as to understand how mathematical concepts are reflected in people's culinary practices. The method used in this research is a literature review with data collection carried out on the Google Scholar database to retrieve relevant articles. The results of the research show that the traditional egg crust food contains mathematical concepts, namely geometry, which can be used as a medium for learning mathematics in schools, especially elementary and middle schools. Thus, learning mathematics will be more meaningful because the learning sources come from their own cultural environment
MODEL PERAMALAN NILAI TUKAR RUPIAH TERHADAP DOLLAR SINGAPURA MENGGUNAKAN METODE HYBRID ARIMA-ANN
Authors: Fadhlia Sarah , Hendri Eko Primadi , Cahyaningtyas A Deasy Dwi
Published: January 2025

This research aims to predict the Rupiah exchange rate against the Singapore Dollar using the hybrid ARIMA-ANN method. The hybrid model is used to increase prediction accuracy by utilizing the ARIMA model to capture linear patterns and the ANN model to capture non-linear patterns. The data used in this research is data on the Rupiah exchange rate against the Singapore Dollar. The ARIMA model used for hybrid modeling is ARIMA (1,1,1) because it has an AIC value of 2144.93 which is smaller than other ARIMA models. The residuals from the ARIMA model (1,1,1) are used for ANN modeling. ANN modeling uses 3 inputs, 1-10 hidden layers, and 1 output layer. Based on the analysis results, the ARIMA (1,1,1) - ANN (3,10,1) hybrid model has an RMSE value of 52.092 which is smaller than other ARIMA-ANN hybrid models. Therefore, the hybrid ARIMA (1,1,1) - ANN (3,10,1) model is more effective in predicting the Rupiah exchange rate against the Singapore Dollar.
ANALISIS KESTABILAN MODIFIKASI MODEL SEIQR PENYEBARAN SARS-COV-2 DENGAN ADANYA MOBILITAS INTERNASIONAL DI INDONESIA
Authors: Br Purba Rohna Lensa , Sinaga Lasker P
Published: January 2025

Coronavirus Disease (COVID-19) is a virus caused by Severe Acute Respiratory Syndrome Coronavirus-2 (SARS-CoV-2). Since January 2020, COVID-19 was declared a pandemic by WHO, various countries throughout the world have made efforts to prevent the entry of the COVID-19 outbreak into their respective countries, including Indonesia, by limiting mobility. This research aims to develop a modified SEIQR model for the spread of SARS-CoV-2 in Indonesia by considering international mobility and analyzing the stability of the model. Numerical simulations were also carried out to see the stability results of the SEIQR modification model using suspect data before/after vaccination. The results of this research show that the modified model has two critical points, namely disease-free and disease-endemic critical points, both points are stable when the parameter inequality conditions based on the Routh-Hurwitz criteria are met. Numerical simulations show that the process of suspected infection before vaccination is slower than individual infection after vaccination. From the results of this research, it is concluded that efforts to limit international mobility in Indonesia can reduce the number of new individuals exposed to and infected with COVID-19 in Indonesia.
ANALISIS FAKTOR PENYEBAB PENYAKIT JANTUNG MENGGUNAKAN METODE PRINCIPAL COMPONENT ANALYSIS (PCA)
Authors: Manullang Sudianto , Kairani Nerli , Sinaga Marlina Setia , Hutapea Brian , Nadya Fauza , Br Barus Jesika Casadae Wanda , Tamara Angga , Silaban Dewi Fortuna
Published: January 2025

Factor analysis is an important method in research to identify the underlying structure of complex data. Heart disease is a disease caused by a disturbance in the coronary blood vessels that causes narrowing and blockage so that it can interfere with the body's energy transportation process and also cause an imbalance between oxygen demand and oxygen supply. Various factors such as age, gender, smoking, etc. have an important role for a person to get heart disease. This study aims to analyze the factors that cause heart disease using the Principal Component Analysis (PCA) method. PCA is used to identify and reduce the dimensions of heart disease factor data. The data used in this study were obtained from journals and consisted of 7 variables. PCA successfully identified 2 main factors that explained 75% of the total variance in the data. Through dimensionality reduction, the number of variables was successfully reduced from 7 factors to 2 factors without significant information loss. This study found that the PCA method was effective in reducing the dimensionality of the data and identifying the main factors underlying the data.
ANALYSIS OF EARLY DETECTION, MOTIVATION AND WORK COMPETENCE ON THE QUALITY OF WORK RESULTS WITH INTERNAL CONTROL AS AN INTERVENING VARIABLE USING STRUCTURAL EQUATION MODELLING
Authors: Buang Andri
Published: January 2025

The purpose of this study is to see the direct and indirect influence of early detection variables, motivation and work competence on the quality of work results. For indirect influence, the intervening variable used is internal control. The population used in this study is the State Civil Apparatus in eight Regional Apparatus Organizations of the Riau Islands Provincial Government. The sampling technique uses the total sampling technique. The analysis method used in this study is Structural Equation Modeling (SEM). The instrument to collect data in this study is a questionnaire using a Likert scale. The results showed that the variables of early detection, motivation and work competence did not have a significant effect on the quality of work results directly. For indirect effect, early detection, motivation and work competence have a significant effect on the quality of work results with internal control as an intervening variable.
PENGEMBANGAN LKPD BERBASIS ASESMEN KOMPETENSI MINIMUM UNTUK MENINGKATKAN KEMAMPUAN LITERASI NUMERASI SISWA
Authors: Zebua Soniat Mekartini , Harefa Amin Otoni , Mendrofa Netti Kariani , Zega Yulisman
Published: January 2025

This research is development research that aims to produce products in the form of LKPD based on Minimum Competency Assessment (AKM) which is valid, practical and effective. This type of research is research development. The development model used is the 4D model. There are four stages in the 4D model are define, design, develop, and disseminate. The data collection instruments used are validation sheets, questionnaires given to experts to find out the feasibility of the product and questionnaires given to experts. given to experts to find out the feasibility of the product and a questionnaire given to students to find out the attractiveness of the product. Given to students to determine the attractiveness of the product. Results validity results obtained from material experts, linguists, and media experts obtained an average of 97.5%, while the practical results of students obtained an average of 92.6%. average of 92.6%, and the effectiveness test results obtained an average of 91.6%. It can be concluded that the AKM-based LKPD is categorized as very valid, very practical, and very effective. valid, very practical, and very effective for improving students' numeracy literacy skills. literacy skills of students.
ANALYZING THE INFLUENCE OF VARIOUS FACTORS ON GENERATION Z'S BEAUTY PRODUCT PURCHASE BEHAVIOR
Authors: Natalie Karen , Siregar Bakti
Published: January 2025

In the digital era, Generation Z predominantly relies on digital platforms to select beauty products, both local and international, significantly impacting their purchasing decisions. This study investigates the influence of social media marketing, brand awareness, quality, price, online customer reviews, and discounts on Generation Z’s purchasing behaviours using multiple linear regression and correlation coefficients, analysed with R Studio and SPSS Statistics 25. A quantitative approach was employed, utilizing a questionnaire to collect data from 213 respondents. The results indicate that for international beauty products, social media marketing, brand awareness, product quality, and discounts are significant predictors of purchase intention (R² = 0.832). Conversely, for local beauty products, the key factors influencing purchase decisions are quality, price, online customer reviews, and discounts (R² = 0.790). These findings highlight that the determinants of Generation Z’s purchasing decisions vary based on the product type. While international products are more influenced by marketing and branding, local products are more affected by price and customer feedback. These insights are crucial for beauty brands aiming to tailor their marketing strategies effectively to engage Generation Z.
MODEL PERGERAKAN HARGA MINYAK MENTAH BRENT MENGGUNAKAN PENDEKATAN TIME SERIES DENGAN EFEK LONG MEMORY
Authors: Ramadhani Eza Syafri , Devianto Dodi , Yanuar Ferra
Published: January 2025

Oil price movements are highly volatile and tend to be influenced over extended periods, often displaying long memory effect. This study utilizes the Autoregressive Fractionally Integrated Moving Average (ARFIMA) model, a long memory model, to analyze and forecast crude oil prices using monthly Brent data from November 1998 to November 2023. The analysis confirms the presence of long memory in the Brent crude oil price data. The ARFIMA model is then developed by estimating the parameter  using the Rescaled Range Statistics (R/S) method. The best model is selected based on the lowest AIC and BIC values. The results indicate that the optimal ARFIMA model closely aligns with the actual data patterns, demonstrating its effectiveness in capturing the movements of Brent crude oil prices.
PENERAPAN MODEL RANTAI MARKOV DALAM PERHITUNGAN PREMI ASURANSI LONG TERM CARE UNTUK PENYAKIT JANTUNG DI PULAU SUMATERA
Authors: Lestari Fuji , Sumarna Nur Alvyanti
Published: January 2025

Health insurance is insurance that provides health benefits in the form of cash compensation for medical and treatment costs. One of the health insurance products is Long Term Care (LTC) insurance. Long Term Care insurance provides compensation for the insured who requires medical care or for those suffering from chronic illnesses or physical disabilities that cannot be covered by other insurance. This study discusses the calculation of premiums for heart disease, including hypertension and diabetes, for the LTC insurance product Annuity as a Rider Benefit using a multi-state model application from the Markov Chain model. The multi-state model used includes healthy, sick, and deceased states, with the assumption that there is no transition from sick to healthy. The premium calculation is based on the Markov chain with a transition probability matrix using heart disease prevalence data in Sumatra Island in 2018. The case study in this research includes males and females aged 25, 35, and 45 years, with premium payment periods of 5, 10, and 15 years. The death benefit is IDR 500,000,000.00, the care benefit is IDR 100,000,000.00, and the interest rate is 6.25%. Based on age, the calculation of the annual net premium for Long Term Care insurance, the Annuity as a Rider Benefit product for heart disease in Sumatra Island, shows that men generally have higher premiums compared to women, with a range of 0.9598 to 1.0028 times. Meanwhile, based on the premium payment period, men also have higher premiums than women.
PERAMALAN NILAI EKSPOR MIGAS DENGAN MENERAPKAN MODEL AUTOREGREGRESSIVE FRACTIONALLY INTEGRATED MOVING AVERAGE (ARFIMA)
Authors: Rahwani Putri Hazizah , Syaiful Achmad , Alvionita S Mika
Published: January 2025

Indonesia, a nation in Southeast Asia, has a wealth of natural resources that could serve as the basis for future economic growth. Increased exports of natural resources are crucial for market expansion, job creation, foreign exchange gains, and economic progress. Despite the oil and gas industry's significant contribution, Indonesia still has a trade imbalance in these products and has volatility in export values due to changes in international oil prices and the state of the world economy. This study forecasts the value of Indonesia's oil and gas exports using the Autoregressive Fractionally Integrated Moving Average (ARFIMA) approach, which has a long-term time series structure. The goals of this study are to identify the optimal ARFIMA model using MAPE and AIC for data on oil and gas export values, forecast the value of oil and gas exports using the optimal ARFIMA model many months in advance, and assess the ARFIMA model's forecasting accuracy. The best model, according to the results, is ARFIMA (0, [0.32], 2), with a MAPE score of 1.78%, indicating strong predicting accuracy for the upcoming periods. It is anticipated that this model will support Indonesia's economic stability and aid the government in strategic planning.
ANALISIS RISIKO DAN MITIGASI PADA PENGIRIMAN ALAT BERAT DENGAN METODE ERM
Authors: Sihombing Tulus Martua , Adiprasetyo Wahyudi , Irajani Yehezkhiel Shallom
Published: January 2025

Heavy lift delivery activities are complex and complicated, the handling process is also different when compared to loads in general due to excess dimension factors, both length, width, and height. There are constraints and risks in the delivery of heavy equipment. This study aims to analyze operational risks arising from heavy equipment delivery activities at PT Daily Express Cargo. By analyzing the risks that may occur, it is expected that the company can take the right decisions and actions to overcome the risks. The research method used is the Enterprise Risk Management (ERM) method with descriptive analysis and qualitative approach. Data collection techniques through in-person interviews and questionnaires. In this study, twenty operational risks were found. After identification and risk assessment, there are four risk levels, namely high, medium, low, and very low levels. At a high level there are 2 risks, at a medium level there are 5 risks, at a low level there are 5 risks, and at a very low level there are 8 risks. Each risk that arises requires appropriate risk control tailored to its type
PERBANDINGAN K-MEDOIDS DAN CLARA (Clustering Large Application) PADA DATA POPULASI TERNAK DI INDONESIA
Authors: Ardhani Rizky , Marshelle Sean , Fitrianto Anwar , Erfiani Erfiani , Jumansyah L. M. Risman Dwi
Published: January 2025

This study compares the K-Medoids and CLARA (Clustering Large Application) methods for livestock population data in Indonesian districts and cities. Calculating the distance between points and objects in the data, K-Medoids is a method for clustering based on data points (medoids). A larger dataset is divided into several samples for comparison in CLARA, an extension of the K-Medoids approach. The CLARA method analysis results show that three clusters are the ideal number. The ideal number of clusters in a K-Medoids cluster analysis is two. The Silhouette Score (SS), Davis-Bouldin Index (DBI), and Calinski-Harabasz Index (CHI) are the metrics that are measured. The evaluation of the comparison results shows that the CLARA method has an SS value of 0.66, while K-Medoids has an SS value of 0.62. The comparison of the CLARA and K-Medoids approaches yielded DBI values of 1.38 and 1.92, respectively, and 197.54 and 132.73 for CHI. The findings indicate that, in comparison to the K-Medoids approach, the SS value for the CLARA method is closer to 1, and that the CHI value derived from the CLARA method is likewise greater. The K-Medoids approach has a higher DBI value than the CLARA method, where a lower DBI value denotes superior performance. The CLARA approach is the most effective way to do cluster analysis on livestock population data in Indonesian districts and cities, according to the findings.
PERAMALAN HARGA SAHAM PT UNILEVER INDONESIA MENGGUNAKAN FUZZY TIME SERIES MARKOV CHAIN ABSOLUTE DIFFERENCES K-MEANS CLUSTERING DAN FUZZY TIME SERIES MARKOV CHAIN TREE PARTITION METHOD
Authors: Rafi' Muhammad Thufeil , Firdaniza Firdaniza , Parmikanti Kankan
Published: January 2025

Stocks are an investment instrument that is in high demand and can provide large profits for investors, especially stocks from large and popular companies, such as PT Unilever Indonesia. However, the boycott action causes its share price to tend to decline and makes it difficult for investors to make investment decisions. In this research, the development of the Fuzzy Time Series Markov Chain (FTSMC) method, namely Fuzzy Time Series Markov Chain Absolute Differences K-Means Clustering (FTSMC-ADKC) and Fuzzy Time Series Markov Chain Tree Partition Method (FTSMC-TPM) is used in forecasting the stock price of PT Unilever Indonesia. Both methods have a good ability to forecast volatile time series data and do not require data distribution assumptions such as classical forecasting methods. Furthermore, the accuracy of the two methods is compared through the Mean Absolute Percentage Error (MAPE) value, resulting in FTSMC-ADKC being more accurate with a MAPE of 0.71% compared to FTSMC-TPM with a MAPE of 1.21%. By using FTSMC-ADKC, the closing price of PT Unilever Indonesia shares on March 27, 2024 is estimated to be Rp2724.46, which has decreased from the previous day.