USU-IR Repositori Institusi Universitas Sumatera Utara
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The Influence Of Influencer Marketing and Fear Of Missing Out (Fomo) on Impulse Buying Among Generation-Z Tiktok Users In Medan City (A Case Study on Rucas.Co)
No full textThis study aims to examine and analyze the influence of Influencer Marketing and Fear of Missing Out (FOMO) on Impulse Buying among Rucas.co customers in Medan City. This research is associative in nature, using primary data obtained through questionnaires distributed to Rucas.co consumers. The population of this study consists of all consumers who have ever purchased Rucas.co products, with a sample size of 110 respondents determined using Hair’s formula. The data analysis technique employed is multiple linear regression analysis. The results indicate that Influencer Marketing and Fear of Missing Out simultaneously have a significant effect on Impulse Buying among Rucas.co customers. Partially, Influencer Marketing has a positive and significant effect on Impulse Buying, and similarly, Fear of Missing Out (FOMO) has a positive and significant effect on Impulse Buying. This finding shows that promotional strategies through influencers and the psychological drive of FOMO can encourage consumers to make impulsive purchases.114 PagesSkripsi Sarjan
Selection of Families Based on Flowering Age and Yield of Crosses Between Three Soybean [(Glycine max (L.) Merril)] parents
No full textKedelai merupakan sumber protein nabati yang penting di Indonesia, sering digunakan sebagai bahan pangan, pakan ternak, dan bahan baku industri. Namun, Indonesia masih sangat bergantung pada impor kedelai, yang menjadi masalah nasional. Oleh karena itu, penelitian ini bertujuan untuk meningkatkan produktivitas kedelai dalam negeri melalui pemilihan varietas unggul. Penelitian dilaksanakan dari Oktober 2024 hingga Januari 2025 di Jalan Pasar 1 Nomor 296, Tj. Sari, Kecamatan Medan Selayang, Provinsi Sumatera Utara, pada ketinggian 32 mdpl, dengan menggunakan metode analisis deskriptif. Hasil penelitian menunjukkan bahwa 24 galur tanaman terbaik terpilih berdasarkan karakter umur berbunga yang seragam antara 28-29 hari dan bobot biji tertinggi mencapai 45,52 gam. Uji T menunjukkan bahwa karakter fenotipik kedelai F5 lebih dominan menyerupai tetua Grobogan, yang mengindikasikan adanya pengaruh gen maternal dalam pewarisan sifat. Diferensial seleksi mengungkapkan peningkatan signifikan pada karakter bobot biji, sementara umur berbunga dan jumlah polong hampa relatif stabil, menandakan produksi kedelai yang optimal. Penelitian ini menyimpulkan bahwa seleksi famili F5 berhasil menghasilkan 24 galur dengan karakter umur berbunga yang lebih cepat dan bobot biji yang tinggi, sehingga berpotensi untuk menghasilkan varietas kedelai unggul yang dapat mendukung ketahanan pangan di Indonesia.53 PagesSkripsi Sarjan
Indonesian Short Message Spam Detection System Using IndoBERT and Multi-Graph Convolutional Network
No full textShort Message Service (SMS) in Indonesia remains a primary medium for disseminating
unwanted spam content, ranging from aggressive commercial advertisements to
harmful financial fraud attempts that pose significant risks to users. The core challenge
in SMS spam detection lies in the dynamic linguistic complexity of the Indonesian
language, which frequently incorporates slang, inconsistent abbreviations, and code-
switching patterns that hinder traditional keyword-based filtering techniques. While
transformer-based language models such as IndoBERT have demonstrated exceptional
performance in semantic context understanding, they often struggle with structural text
obfuscation designed to bypass automated security systems. This research proposes an
innovative hybrid architecture that integrates the rich semantic representations of
IndoBERT with the structural analysis capabilities of a Multi-Graph Convolutional
Network (GCN). Through this approach, relational patterns between words are modeled
as graph representations to augment the contextual depth of the base model. This study
utilizes a curated dataset of Indonesian SMS messages to train and evaluate the
performance of the proposed hybrid model. Experimental results demonstrate
outstanding performance, with the model achieving a peak accuracy of 99.93% and an
F1-Score of 1.00. Ablation studies further confirm that incorporating graph-based
features significantly enhances detection precision and effectively minimizes false
positive rates compared to using the standalone language model. The findings of this
research provide significant theoretical contributions to the field of Natural Language
Processing and are practically implemented as a real-time detection prototype to
validate its robustness and feasibility in addressing spam threats within real-world
communication scenarios.100 PagesSkripsi Sarjan
Study of the Distribution of Domestic Wastewater Contamination from Septic Tanks on Andosol Soil Types
No full textThe current increasing population growth will increase development, especially residential
development. Population growth leads to surface and groundwater pollution due to limited
sanitation and domestic waste management. Households generally use septic tanks to
manage domestic wastewater, but these often do not comply with SNI regulations,
potentially contaminating shallow groundwater. Due to these issues, the authors conducted
a laboratory-scale simulation of septic tank wastewater distribution in andosol soil. This
simulation was conducted using a 100 cm x 100 cm x 40 cm glass box. The purpose of this
study was to determine the spread distance, travel time, and flow rate of septic tank
wastewater horizontally and vertically in a glass box. The spread simulation was carried
out with a test scale between the laboratory and existing conditions of 1:10. The physical
properties of the soil were tested, the concentration of Escherichia coli and Ammonia
(NH3N) contaminant parameters, and the concentration of contaminants based on distance
and time. The number of samples tested was 20 points arranged diagonally. The results of
the soil physical properties test include; soil specific gravity value of 2.6505%, plastic limit
of 10.985%, liquid limit of 36.697%, plastic index of 25.712%, sieve analysis of 17.265%,
water content of 20.42%, and permeability value of 5.966x 10-5 cm/s. The results of the
Escherichia coli concentration test at the closest distance from the source of the spread of
18.3 x 107 (CFU/100 ml) and the furthest distance of 6.2 x 107 (CFU/100 ml) with a
percentage decrease of 66%. The concentration of Ammonia (NH3N) at the closest distance
from the source of the spread of 4.2 (mg/L) and the furthest distance of 1.1 (mg/L) with a
percentage decrease of 74%. The simulation results of the vertical distribution of septic
tank wastewater in a glass box as far as 20 cm requires 236 minutes (3 hours 56 minutes)
with an infiltration rate of 5.56 cm/hour and horizontal distribution in a glass box at a
distance of 80 cm requires a distribution travel time of 505 minutes (8 hours 25 minutes)
with a speed/flow rate of septic tank water distribution of 9.2 x 10-3 Liters/minute.88 PagesSkripsi Sarjan
Experimental Study of Static Mechanical Properties and Crack Patterns of Concrete Reinforced with Palm Oil Fuel Ash and Fly Ash
No full textCement production significantly contributes to global carbon emissions, necessitating eco-friendly material innovations utilizing industrial waste. This study aims to analyze the effect of partial cement substitution using a combination of Fly Ash (FA) and Palm Oil Fuel Ash (POFA/ACS) on the static mechanical properties and crack pattern characteristics of Engineered Cementitious Composites (ECC) mortar. The experimental method involved varying Fly Ash levels (10% and 15%) and ACS levels (0%, 5%, 10%, and 15%) by weight of cement. Tests included slump flow, density, compressive strength, split tensile strength, microstructural analysis using Scanning Electron Microscope (SEM) and EDS, as well as crack pattern analysis following static testing. The results showed that all mixture variations exhibited good flowability with T500 spread times between 0.4 and 1.6 seconds. This material combination effectively improved density, where the M44 variation (15% FA + 15% ACS) recorded the lowest water absorption of 0.78%. The optimum composition was achieved in the M43 variation with a combination of 15% Fly Ash and 10% ACS. At 28 days, this variation yielded a maximum compressive strength of 49.56 MPa and a split tensile strength of 6.83 MPa, categorizing it as high-strength concrete. Microstructural analysis confirmed the formation of massive and dense Calcium Silicate Hydrate (C-S-H) gel due to pozzolanic reactions and the filler effect. Furthermore, the addition of ACS proved to alter the material's failure behavior from brittle columnar crack patterns in control specimens to more ductile shear crack patterns through a mechanical interlocking mechanism between particles.116 PagesSkripsi Sarjan
Small-Clawed Otters (Aonyx cinereus) Activities at the Rahmat Zoo and Park, Bengabing Village, Pegajahan, North Sumatera
No full textThis study aims to examine the activity patterns of small-clawed otters (Aonyx cinereus)
maintained at Rahmat Zoo and Park, Bengabing Village, Pegajahan, North Sumatra.
From a biological perspective, the study of daily activity provides important insights
into behavioral biology and supports conservation efforts by improving the
understanding of species adaptation under captive conditions. Observations are
conducted on a male and a female individual approximately one year old over a 14-day
period, from 08:00 to 16:00 WIB, using the focal animal sampling method with two
minute recording intervals. Activity data are classified into ten behavioral categories
and quantitatively analyzed by calculating the percentage frequency of each behavior,
which is then presented graphically. The results have shown that the dominant activities
of the male otter have been locomotion (36.32%) and resting (35.79%), whereas the
dominant activities of the female otters have been locomotion (34.72%) and resting
(36.85%). Other observed behaviors included vocalization, feeding, grooming, social
interaction, standing, alertness, elimination, territorial marking, begging, and mating,
all occurring at lower percentages. These findings demonstrated that the activities of
Aonyx cinereus in captivity have been largely dominated by locomotion and resting
behaviors and have been influenced by environmental factors and husbandry conditions.
This study has provided additional biological information to support management
practices and conservation strategies for small-clawed otters in conservation
institutions.70 PagesSkripsi Sarjan
Compressive Strength of Scaffold Based on Nile Tilapia Fish Scale Nano-Hydroxyapatite and Commercial Gelatin Using Porogen Leaching Method with Different Weight Concentration Ratios.
No full textBone defects exceeding the critical size threshold (>2 cm) require medical interventions to prevent pathological fractures that cannot be naturally supported by the body. One potential solution is the use of nano-hydroxyapatite (nHAp)-based scaffold synthesized from tilapia fish scales (Oreochromis niloticus), which exhibit a Ca/P ratio of 1.67. This study aimed to analyze the compressive strength of scaffolds fabricated from combinations of nHAp and commercial gelatin at weight percentage ratios of 20:10, 30:15, and 40:20. The samples consisted of scaffolds with a diameter of 6.5 mm and a thickness of 10.8 mm, prepared from nano-hydroxyapatite synthesized from tilapia fish scales using calcination and alkaline heat treatment methods. A total of 30 samples were produced and divided into three groups (n = 10) based on the HA-to-gelatin weight ratios: 20:10 (Group I), 30:15 (Group II), and 40:20 (Group III). The scaffolds were fabricated using the porogen leaching method followed by calcination at 800°C. Compressive strength testing was conducted using a Universal Testing Machine. The results showed that the highest compressive strength was observed in Group III (4,62±0,12 MPa), followed by Group II (4,59±0,11 MPa) and Group I (4,15±0,25 MPa). Kruskal–Wallis analysis revealed a statistically significant difference in compressive strength among all treatment groups (p < 0,05). It can be concluded that increasing the percentage of nano-hydroxyapatite relative to gelatin enhances the compressive strength of the scaffold.93 PagesSkripsi Sarjan
The Implementation of Eco-Labeling as a Guarantee for the Fulfillment of Consumer Rights to Environmentally Friendly Products
No full textThe environment is an integrated spatial unit that encompasses all objects, forces, conditions, and living beings, including humans and their behavior, which affect the survival and well-being of humans and other creatures, as regulated in Article 1 Point (1) of Law Number 32 of 2009 on Environmental Protection and Management. Environmental issues have become increasingly complex due to climate change and waste generated by societal consumption. The ecolabel policy emerges as an important instrument for sustainable production and consumption. This thesis aims to examine the legal provisions governing ecolabels, the standardization of environmentally friendly products, and the implementation of ecolabels as a guarantee of consumer rights in environmentally friendly products in Indonesia.
This research uses a normative legal method through the statute approach and the conceptual approach. Secondary data were obtained from primary legal materials (laws and regulations) and secondary legal materials (books, journals, and scientific articles). The data were analyzed qualitatively using deductive reasoning.
The findings show that the legal provisions on ecolabels are structured hierarchically, starting from the main legislation, Law Number 32 of 2009 on Environmental Protection and Management and followed by ministerial regulations as its implementing rules. The implementation of ecolabels as a guarantee of consumer rights is also connected to Law Number 8 0f 1999 on Consumner Protection. The standardization of environmentally friendly product refers to the Indonesia National Standar (SNI) and ISO 14000 (International Organization for Standardization), which serve as the basis for implementation of ecolabels before ecolabels are applied to such products. The implementation of ecolabels in Indonesia is voluntary and faces several challenges, including ineffective regulations, complex and costly certification procedure, and low public awareness of ecolabels, all of which may harm consumer rights. Therefore, optimizing ecolabel implementation can be pursued through strengthening regulations, simplifying procedures and costs, and increasing public awareness and understanding of ecolabels.128 PagesSkripsi Sarjan
The Effect of Loan to Deposit, Debt to Asset, and Foreign Ownership Structure on Return on Asset in Banking Companies Listed on Indonesia Stock Exchange (IDX) for The 2020–2024 Period
No full textThis study aims to examine the effect of loan to deposit, debt to asset, and foreign ownership structure on return on assets. This research employs a quantitative approach with banking companies listed on the Indonesia Stock Exchange (IDX) during the 2020–2024 period as the research object, totaling 47 companies. Of these, 44 companies were included in the population due to the unavailability of complete data for the remaining firms. The findings indicate that debt to asset has a negative and significant effect on return on assets, while loan to deposit and foreign ownership structure show no significant influence on return on assets.90 pagesSkripsi Sarjan
Integration of CURE and SHAP Methods for Mapping Stunting Risk Factor Analysis in Medan City
No full textStunting is a chronic nutritional problem that remains a major challenge in public health development in Indonesia, including in Medan City, as it directly affects the quality of human resources in the long term. This condition is influenced by various multidimensional factors such as socioeconomic conditions, environmental sanitation, access to clean drinking water, parenting patterns, and the availability of healthcare services. This study aims to map regional stunting risk in Medan City by integrating the Clustering Using Representatives (CURE) method for regional grouping and SHapley Additive exPlanations (SHAP) for identifying the most influential risk factors. The dataset used in this study consists of 16,525 toddler records obtained from the Medan City Health Office and has undergone data preprocessing. Six main features were selected for the clustering process based on data completeness and relevance to stunting risk, namely exclusive breastfeeding, income level, health insurance ownership, housing condition, sanitation, and drinking water sources. The clustering results produced four regional clusters with excellent clustering quality, as indicated by a Silhouette Score of 0.899 and a Davies–Bouldin Index of 0.131, confirming that the clusters are compact and well separated. The SHAP analysis reveals that parental occupation (0.6523), sanitation (0.2507), and access to clean drinking water (0.2316) are the most dominant factors influencing stunting risk, followed by health insurance ownership (0.2205), exclusive breastfeeding status (0.1623), income level (0.1603), and housing condition (0.0803). The integration of CURE and SHAP provides a stunting risk mapping that is not only descriptive in illustrating the spatial distribution of risk but also explanatory in identifying the main contributing factors, thereby serving as a strong foundation for formulating targeted and sustainable region-based stunting intervention policies.115 PagesSkripsi Sarjan