Stock Portfolio Optimization of Several Companies Engaged in Renewable Energy for Investment Decision-Making Using the Markowitz Model

This study focuses on optimizing the renewable energy company\u27s stock portfolio using the Markowitz model, which aims to balance risk and return for proper investment decision making. With the increasing demand for clean energy, portfolio optimization in the renewable energy sector is important for investors. This research takes into account historical stock performance and applies the Mean-Variance Optimization framework to minimize risk while maximizing return. This portfolio consists of selected renewable energy companies, and the analysis runs from September 2021 to August 2024. This study aims to analyze the allocation of investment portfolios in renewable energy company stocks in Indonesia. Based on the analysis results, the investment portfolio is allocated to five main stocks, namely BUMI.JK with an investment value of IDR 17,075,844 (17.08%), INDY.JK of IDR 5,825,852 (5.83%), KEEN.JK of IDR 33,766,798 (33.77%), RAJA.JK of IDR 43,084,876 (43.08%), and WIKA.JK of IDR 246,630 (0.25%). These results indicate that most of the funds are invested in RAJA.JK and KEEN.JK stocks, which contribute more than 75% of the total investment portfolio

Exploring the Role of Refugee Entrepreneurs in South Africa: A Quantitative Study on Networks, Bulk Buying, and Profitability

This study explores the contribution of refugee entrepreneurship (RE) to South Africa\u27s economy, a topic that remains under-researched despite the critical role these entrepreneurs play in job creation and employment. Employing a quantitative research approach, data were collected from 197 purposively selected participants through self-administered questionnaires. The data was analysed using SPSS and AMOS statistical software. The findings reveal that networks significantly contribute to business success by providing access to crucial resources, such as financing and market information. Refugee entrepreneurs leverage these, networks to overcome business challenges, receive financial support, and expand their entrepreneurial ventures. Additionally, bulk buying strategies reduce operational costs and enhance profitability. The study’s results also highlight the role of refugee businesses in filling gaps in underserved markets, as well as fostering collaboration with South African businesses, leading to the creation of jobs for local citizens. This research underscores the economic dynamism, job creation, and market diversification that refugee entrepreneurs contribute to South Africa\u27s economy, emphasising their role as an essential driver of inclusive growth and economic stability in host countries

Design of A Decision Support System for Students\u27 Extracurricular Choices using the TOPSIS Method at SMKN 1 Bukit Sundi

Education not only emphasizes academic excellence but also requires the development of students\u27 character, talents, and soft skills. Extracurricular activities play a crucial role in providing students with opportunities to explore their potential beyond the classroom. However, students often encounter difficulties in selecting the most suitable extracurricular activity, which may result in low motivation and reduced participation. To address this issue, a web-based Decision Support System (DSS) was developed using the Technique for Order Preference by Similarity to Ideal Solution (TOPSIS). The system considers multiple criteria, namely interest, talent, academic achievement, parental support, physical condition, and equipment cost, to generate objective recommendations. The research was conducted at SMKN 1 Bukit Sundi with seven extracurricular alternatives, including Futsal, Volleyball, Pramuka, Paskibra, Marching Band, OSIS, PMR, and Randai. The system was implemented using PHP and MySQL, providing an automated process of normalization, weighting, calculation of ideal solutions, and ranking. Results showed that Futsal achieved the highest preference value (0.755846), followed by Volleyball and Pramuka, while Randai ranked lowest with a value of 0.223794. These findings indicate that student preferences are strongly aligned with sports and leadership activities, while traditional art forms are less favoured. The system proved to be consistent with manual calculations and successfully enhanced transparency, efficiency, and accessibility in extracurricular selection. Compared to alternative methods such as SAW, TOPSIS offered greater flexibility by accommodating both benefit and cost attributes simultaneously. This study contributes practically by providing a tool that supports schools and students in decision-making, and academically by extending the application of TOPSIS in vocational education

Implementation of The Apriori Algorithm on X Cafe Sales Transactions for Product Bundling Package Recommendations

Bundling packages are a marketing strategy in which several products are combined at a more attractive price than if purchased separately. This strategy effectively increases sales, attracts new customers, and levels up the average transaction value. Cafe X, located in Bogor, is a coffee shop that has not yet had a product bundling strategy package to increase product sales. This study aims to implement the Apriori algorithm on sales transactions at Cafe X to bundle product recommendations. The research stages consist of data collection, preprocessing, implementation of an apriori algorithm, and extracting association rules. In this study, a website-based apriori algorithm was implemented. Users can enter the minimum support value, minimum confidence value, and the recommended menu for product bundling. Based on the research results, it is produced for data input on the application with menu recommendations in the form of Tsuin Iced Coffee and Chicken Strips menus with a minimum support of 50% and a minimum Confidence of 90% can produce recommendations for 3 product bundling packages, including Package 1 recommendations are Tsuin Iced Coffee, Chicken Strips, Hot Barbeque Chicken. Package 2 recommendations are Tsuin Iced Coffee, Chicken Strips, and Nachos. Package 3 recommendations are Tsuin Iced Coffee, Chicken Strips, Hot BBQ chicken and Nachos

The Impact of Ease of Digital Access on the Increase in Online Gambling Cases Among Students

This study investigates the relationship between ease of digital access and increasing online gambling participation among Indonesian university students. Through a quantitative descriptive approach involving 420 respondents from various universities, the research examines how technological advancement has influenced gambling behavior among students and its multidimensional consequences. The findings reveal a significant correlation between digital accessibility and gambling participation, with 43.3% of respondents having engaged in online gambling and 25.9% remaining active gamblers. Students with easy digital access were nearly three times more likely to gamble online compared to those with limited access. Demographic analysis showed higher participation rates among male students and those residing in urban areas with superior digital infrastructure. The research identified substantial negative impacts on participants, including psychological effects (76.4% experiencing stress and anxiety) and academic consequences (56.6% reporting decreased concentration). Despite 62% of students claiming moderate digital literacy, only 28% demonstrated true understanding of digital risks, revealing a critical gap between technical proficiency and risk awareness. The majority of gambling-involved students (67.2%) reported first encountering gambling through social media platforms, highlighting the influential role of digital marketing in normalizing gambling behavior. This study underscores the need for comprehensive interventions including enhanced digital literacy education, campus-based support services, strengthened regulatory frameworks, and innovative prevention campaigns targeting digital-native students. The research contributes to understanding how rapidly evolving digital ecosystems create unprecedented challenges in academic environments and offers strategic recommendations for institutional and governmental responses to protect student welfare and academic success

The Effect of Social Media, Online Food Delivery Service (OFDS), Digital Wallet on the Progress of Micro, Small and Medium Enterprises (MSMEs) in Cirebon City

In this research, we look at how using Online Food Delivery Service (OFDS), social media, and digital wallets on progress of culinary Micro, Small, and Medium Enterprises (MSMEs) in Cirebon City. As digital technology develops, MSMEs are required to adapt to improve competitiveness and business sustainability. Using methods from multiple linear regression analysis, this study took a quantitative approach, involving 369 respondents from a total of 4,830 culinary MSMEs in Cirebon. According to the findings, all three factors significantly and favorably affect the development of MSMEs. Social media acts as an effective marketing tool to increase visibility and interaction with customers. OFDS facilitates consumer access to MSME products without the need for physical stores, thus expanding the market and improving distribution efficiency. Meanwhile, digital wallets simplify transactions, increase payment security, and help with financial record-keeping. With these findings, the study suggests that MSMEs should increasingly actively utilize digital technology to expand markets and improve operational efficiency. The implications of this research can serve as a reference for businesses, government, and digital service providers in support of MSME growth in the digital era

Shopee as a Marketing Media: User Generated Content, Brand Trust, and Perceived Usefulness on Azarine Skincare Purchasing Decision

Considering the overclaim issue in the skincare sector, this study intends to assess, on the Shopee e-commerce platform, the influence of User Generated Content (UGC), Brand Trust, and Perceived Usefulness on purchasing decisions for Azaline skincare products. The context of this study is based on the fast expansion of e-commerce in Indonesia, the great popularity of skincare goods on Shopee, and the issue of overclaim that can influence consumer confidence. The literature study covers the ideas of UGC, Brand Trust, Perceived Usefulness, and Purchase Decisions together with their dimensions and signs. Data will be gathered in this quantitative study using a survey technique from customers who have bought Azarine goods on Shopee by means of questionnaires As well as to investigate the possible moderation or mediation effects of the overclaim phenomenon, multiple regression analysis will be used to evaluate the hypothesis about the influence of UGC, Brand Trust, and Perceived Usefulness on Purchase Decisions. By tackling the issue of overclaim, it is believed that the findings of this study would shed light on skincare companies in developing successful marketing plans and raising consumer confidence in the digital era

Economic Order Quantity and Supply Chain Performance of County Governments in Western Region, Kenya

Many organizations have realized the significant role played by Economic Order Quantity in determining Supply Chain performance. This study sought to examine the effect of economic order quantity on supply chain performance in county governments in western region, Kenya. This study adopted descriptive survey research design targeting 120 respondents from the procurement, stores and quality assurance departments. Data was obtained using structured questionnaires and analyzed using descriptive and inferential statistics. Descriptive statistics used were: mean, frequency percentage and standard deviation while for Inferential statistics Pearson correlations and simple linear regression was used. The regression results established that Economic Order Quantity had a positive and significant effect on the Supply chain performance of County Governments in Western Region, Kenya. (β= 0.762; p< 0.000). The findings extends knowledge on inventory management practices and specifically on economic order quantity that can enhance performance. The study recommends for County Governments to adopt as well as integrate Economic Order Quantity (EOQ) into its supply chain strategies

Stock Investment Portfolio Optimization Using Mean-Variance Model Based on Stock Price Prediction with Long-Short Term Memory

Stock investment in the technology sector in Indonesia offers high potential returns. However, like any other investment instruments, the associated risks cannot be overlooked. Therefore, an appropriate portfolio optimization strategy is needed to enable investors to achieve optimal returns while managing risk. In this study, the author combines stock price prediction approaches with portfolio optimization methods to construct an efficient portfolio. The Long-Short Term Memory (LSTM) model is used to predict daily closing stock prices, with model performance evaluated using Root Mean Square Error (RMSE) and Mean Absolute Percentage Error (MAPE) metrics. An optimal LSTM model is obtained with a batch size hyperparameter of 16 for ISAT, MTDL, MLPT, and EDGE stocks, and a batch size of 32 for DCII stock. For all stocks, the average prediction error from the actual values falls within the range of 1.53% ≤ MAPE ≤ 3.52%. The optimal portfolio is constructed using the Mean-Variance risk aversion model to maximize expected returns while considering risk. The resulting optimal portfolio composition consists of a weight allocation of 19.7% for ISAT stock, 36.8% for MTDL stock, 34.8% for MLPT stock, 3.6% for EDGE stock, and 15% for DCII stock. This portfolio yields an expected portfolio return of 0.001249 and a portfolio variance of 0.000311

Empowerment Strategy for BUMDes-Assisted MSMEs through Management and Technology Innovation in Tanara Village

BUMDes Tanara, located in Tanara District, Serang Regency, Banten Province, has good potential for empowering MSMEs fostered by Tanara BUMDes. Tanara BUMDes has developed partnerships with home industries that are capable of competing with other home industry products in the vicinity of Tanara Village and with various MSME products. Home industry actors frequently encounter challenges such as the absence of technology in their production processes, business mentoring and socialization activities conducted by BUMDes or other entities, and marketing that is still performed manually and does not take advantage of e-commerce assistance or technology. This community service aims to provide knowledge and skills to BUMDes fostered partners in increasing the use of technology and business mentoring, especially in marketing, which the PKM team will carry out through socialization and salesmanship training. Therefore, the community service carried out by the PKM team of Bina Bangsa University, funded by DPPM Kemendiktisaintek, for the Fiscal Year 2025, can provide solutions to Tanara BUMDes fostered partners. The method used was gradual outreach and counseling for BUMDes Tanara\u27s fostered partners. The results of the outreach and counseling activities conducted by the Community Partnership Empowerment (PKM) team demonstrated that mentoring and outreach regarding science and high technology needs for the home industry players, fostered by BUMDes Tanara