USU-IR Repositori Institusi Universitas Sumatera Utara
Not a member yet
100433 research outputs found
Sort by
Analysis of Particulate Air Quality PM2.5, PM10 and Lighting Conditions at the Integrated Waste Treatment Facility (TPST) of Universitas Sumatera Utara (USU)
No full textThe increasing consumption patterns of society have led to a significant rise in waste generation, which has the potential to cause various environmental impacts, one of which is air pollution. The Integrated Waste Treatment Facility of Universitas Sumatera Utara (TPST USU), as a waste management facility based on circular economy principles, carries out operational activities that may generate air pollutants and consequently affect workers’ health. This study aims to analyze air quality in terms of PM₂.₅ and PM₁₀ concentrations and lighting conditions under prevailing meteorological conditions, to examine pollutant dispersion patterns using ANSYS Workbench software and the Gaussian dispersion equation, and to formulate recommendations to minimize the
impacts of air pollution on workers at TPST USU. Measurements were conducted at the entrance gate area and the shredding area. The results indicate that the measured concentrations of PM₂.₅ and PM₁₀ in the shredding area exceeded the ambient air quality standards, while concentrations at the entrance gate and receptor locations remained below the regulatory limits as stipulated in Government Regulation Number 22 of 2021. Lighting levels in all work areas met the permissible exposure limits in accordance with the provisions of Minister of Manpower Regulation Number 5 of 2018. Based on these findings, several mitigation measures are recommended to reduce the impact of air pollution on workers, including emission control at the pollution source, regulation of
machine operating hours, improvement of lighting distribution in work areas, and the use of appropriate personal protective equipment.115 PagesSkripsi Sarjan
Penalty Kick Direction Prediction Based on Kicker’s Pose Estimation and Run Up Sequence using LSTM and 1D Convolutional Neural Network (1D CNN)
No full textPenalty kicks are decisive moments that can determine football match outcomes. For goalkeepers, the ability to read kick direction before the ball is struck provides an invaluable advantage. This research develops a penalty kick direction prediction system as a goalkeeper training tool by analyzing the kicker's body movements during the run-up phase. The system employs 3D pose estimation from 429 penalty kick videos and a hybrid 1D CNN-LSTM architecture that combines frame-level spatial pattern analysis with overall movement dynamics understanding. The development process faced significant challenges, particularly limited dataset size and inherent ambiguity in center-directed kicks. Ablation study revealed that the hybrid architecture achieved 52.33% accuracy, improving 11.63% over spatial-only models. A key finding is that temporal component is approximately 2.5 times more critical than spatial component confirming that "how the kicker moves toward the ball" is more informative than "body position at any single moment". While accuracy has not yet reached ideal levels for direct implementation, this research provides scientific and technical foundations for developing computer vision-based goalkeeper training tools, and opens future research directions through integration of additional visual information such as ball trajectory and field context.90 PagesSkripsi Sarjan
Modification Of Oxidized Breadfruit Starch (Artocarpus altilis) Using Sodium Bromate
No full textModification of breadfruit starch (Artocarpus altilis) into carboxylated starch through oxidation reaction using sodium bromate as an oxidizer has been carried out. The modification was performed with a mass ratio of starch to sodium bromate of 1:0.6, 1:0.8, and 1:1 and reaction times of 4, 6, and 8 hours. The carboxylated starch obtained was characterized using FT-IR, SEM, determination of the degree of oxidation, carboxyl content, swelling power, and viscosity. The FT-IR spectrum of native starch shows a wave number of 1640 cm-1 and oxidized starch shows the presence of carboxyl groups (C=O) at a wavelength of 1729 cm-1. The highest degree of oxidation was obtained in carboxylated starch with a 1:1 ratio and a reaction time of 6 hours, which was 82.45%, with a carboxyl content of 0.52%, a swelling power value of 6.4834 g/g, and a viscosity of 0.6518 cP. SEM analysis shows that the broken surface of the granules is caused by an oxidation reaction. The results of this research indicate that the use of starch to sodium bromate ratio and variation in reaction time affect the characteristics of the carboxylated starch formed.70 PagesSkripsi Sarjan
Legal Protection for Heirs Regarding Access to and Management of Digital Assets (Cryptocurrency) as Object of Inheritance in the Digitalization Era
No full textThe development of digital technology has given rise to digital assets in
the form of cryptocurrency, which possess economic value and have the potential
to become part of a person’s wealth. However, the decentralized nature of
cryptocurrency and its access mechanism through private keys create legal issues
when the asset owner passes away, particularly concerning access and
management by heirs. This research aims to analyze the regulation of
cryptocurrency as an object of inheritance under Indonesian positive law, legal
efforts to ensure legal certainty in the inheritance of crypto assets, as well as the
forms of responsibility of digital wallet (crypto wallet) service providers in
guaranteeing heirs’ access rights.
The research method employed is normative legal research supported by
interview results. The approaches used in this study are the statutory approach
and the conceptual approach, utilizing secondary data. The data analysis in this
research is conducted using a qualitative method.
The results of this study indicate that although cryptocurrency is not
explicitly regulated in the Indonesian Civil Code, it can be classified as an
intangible asset with economic value and therefore may be inherited. Regulations
issued by BAPPEBTI, the Financial Sector Development and Strengthening Law
(P2SK Law), and Financial Services Authority Regulation Number 27 of 2024
provide an indirect legal basis for the recognition of crypto assets as legal objects.
Nevertheless, legal gaps remain regarding access mechanisms and the protection
of heirs’ rights. Therefore, regulatory strengthening and the role of crypto wallet
service providers are necessary to ensure legal certainty, access security, and
legal protection for heirs in managing inherited cryptocurrency assets.145 PagesSkripsi Sarjan
Experimental Study on the Performance of Lignin from Oil Palm Empty Fruit Bunches (OPEFB) as a Corrosion Inhibitor for ST41 Steel In 0.5 M H₂SO₄ Medium
No full textThis experimental study was conducted to evaluate the effect of inhibitor concentration and immersion time on weight loss, corrosion rate, inhibition efficiency, and changes in surface roughness of low-carbon steel ST41. The study also aimed to assess the efficiency of lignin extracted from Oil Palm Empty Fruit Bunches (EFB) as a natural corrosion inhibitor for ST41 steel in sulfuric acid (HSO4) medium, and to observe the morphological characteristics of the steel surface with and without the inhibitor. The weight loss method was employed as the primary technique due to its simplicity, by measuring the difference between the initial and final weight of the specimen after immersion in the inhibitor solution. In addition, microscopic and cross-sectional observations were conducted to determine the type and morphology of corrosion formed on the steel surface. The results showed corrosion rate values of 31.6922 mpy. 16.1809 mpy, 15.6787 mpy, and 22.3719 mpy, corresponding to inhibition efficiencies of 34.56%, 82.48%, 67.83%, and 23.85%, respectively, for the 3 g/L inhibitor concentration at immersion times of 1 h. 12 h, 24 h, and 48 h. At a concentration of 7 g/L, the corrosion rates were 26.3358 mpy. 12.2379 mpy, 10.5780 mpy, and 20.2028 mpy, resulting in inhibition efficiencies of 45.62%, 86.75%, 78.30%, and 31.23% for the same immersion durations. These results indicate that the lignin extract acts effectively as a green corrosion inhibitor, with higher concentrations and moderate immersion times producing more stable protective film formation on the ST41 steel surface.128 PagesSkripsi Sarjan
Survey on the Perception of Esthetic Smile among High School Students and Early-Stage Dental Students in Medan in 2025.
No full textThe perception of a smile is influenced by various factors, including education level. Adolescents are a group highly sensitive to their personal appearance. This study aimed to analyze the level and differences in the perception of an estetis smile between high school students and entry-level dental students in Medan. This observational analytic study with a cross-sectional design involved 556 respondents, consisting of 365 students from SMA Negeri 15 Medan and 191 entry-level students from the Faculty of Dentistry, University of Sumatera Utara. Data were collected using an online questionnaire featuring 8 manipulated smile images (esthetic smile, tooth length, tooth color, tooth size, tooth edges, midline shift, diastema, and gingival display). Assessments used a 5-point Likert scale. Data were analyzed using descriptive statistics and the Chi-Square test. Overall, both groups had relatively similar perceptions. The smile with symmetrical proportions and no diastema was rated as the most estetis (mean >4.3), while diastema and midline deviation were rated as the least estetis (mean 0.05). Significant differences were only found in the perception of the general estetis smile and the presence of diastema, indicating that early dental education begins to influence esthetic perception acuity, although not across all the aspects.72 PagesSkripsi Sarjan
Analysis of the Effect of Toll Road Development on the Development UMKM and Economic Growth in the Tebing Tinggi City Area
No full textThis study aims to analyze the influence of the Medan–Tebing Tinggi toll road development on the development of Micro, Small, and Medium Enterprises (MSMEs) and regional economic growth in Tebing Tinggi City. A quantitative approach was employed, supported by qualitative insights, using primary data from 120 MSME actors and secondary data on GRDP from 2020 to 2024. Regression analysis reveals that the toll road development does not have a statistically significant direct effect on regional economic growth (p-value 0.124), but has a significant influence on MSME development (p-value 0.002). Furthermore, MSME development contributes positively and significantly to economic growth (p-value 0.000), and this relationship is strengthened by the role of government policy as a moderating variable (interaction p-value 0.014). These findings suggest that infrastructure development does not automatically drive economic growth directly, but rather supports it indirectly through the enhancement of MSMEs when accompanied by effective local policy. Therefore, infrastructure planning must be aligned with strategies for strengthening the local economy to ensure inclusive and sustainable development.108 PagesTesis Magiste
Application of the Line of Balance Method in Multi-Storey Building Construction Projects
No full textConstruction projects with repetitive activities, such as the construction of multi-storey buildings, require a scheduling method that can clearly and systematically describe the sequence of work. This study analyzes the application of the Line of Balance (LoB) method in the Construction Project of the Integrated Oncology Center Building at Adam Malik Hospital Medan, which has a repetitive work pattern in the structural and mechanical, electrical, and plumbing (MEP) installations from the 1st to the 8th floor. The objectives of this study are to compile a project schedule using the LoB method, compare the resulting duration with the existing schedule using the S-Curve, and evaluate the effectiveness of LoB in managing interdependent activities. The study uses a quantitative approach with secondary data in the form of the S-Curve and the project time schedule. The analysis is carried out through job decomposition, logic diagram preparation, calculation of start and finish times for each work cycle, and LoB graph creation. The results showed that the LoB method produced a total duration of 104 weeks, the same as the duration of the S-Curve method. However, the application of LoB was able to identify conflicts between activities, such as overlapping structural and MEP work, thus allowing schedule improvements through adjustments to the relationships between activities. The revised LoB graph showed no intersections between activities, indicating a more coordinated schedule. Thus, the LoB method has proven effective for projects with repetitive work because it is able to provide a clearer visualization of work relationships and facilitate schedule control.58 PagesSkripsi Sarjan
Isolation and Identification of Flavonoid Compounds From the Bark of Eukaliptus (Eucalyptus grandis W. Hill ex Maiden)
No full textThe isolation and identification of flavonoid compounds obtained from the
bark of eucalyptus tree (Eucalyptus grandis W. Hill ex Maiden) was carried out
using several methods, namely maceration extraction with methanol as the solvent,
partition extraction with ethyl acetate and n-hexane, yielding an ethyl acetate
extract. The concentrated ethyl acetate extract was then analyzed using Thin Layer
Chromatography (TLC) and subsequently separated by column chromatography
using a stationary phase of silica gel and n-hexane : ethyl acetate (90:10; 80:20;
70:30; 60:40; 50:50; 40:60; 30:70; 20:80; 10:90) v
/v as the mobile phase. Fraction
three were purified using preparative TLC with chloroform : ethyl acetate (40:60) v
/v
as the mobile phase. The isolated compound was a 4 mg brown amorphous solid with
an Rf value of 0.48 using chloroform:ethyl acetate (40:60) v
/v as the eluent.
Furthermore, UV-Visible spectrophotometric analysis showed two absorption bands,
the first at 315 nm and the second at 257 nm. Analysis with the Infrared
spectrophotometric (FT-IR) an O–H functional group with an stretching vibration at
a wavenumber 3408.22 cm⁻¹, C=O ketone with an stretching at a wavenumber
1689.64 cm⁻¹, and C–O–C symmetric stretching at 1029.99 cm⁻¹. The ¹H-NMR
spectrum, a characteristic proton signal for H-2 at δ 8.54 ppm, which is typical for
isoflavone compounds. Based on the spectroscopic data, the isolated compound was
identified as a flavonoid belonging to the isoflavone class.64 PagesSkripsi Sarjan
Identification of Dental and Oral Diseases Using Mobilenetv3 and Efficientnetv2 Methods
No full textDental and oral diseases remain a prevalent health issue in Indonesia. The lack of
routine dental check-ups and limited number of medical professionals highlight the
need for an automated image-based identification system. This study implements
two deep learning architectures, MobileNetV3 and EfficientNetV2, to classify seven
types of dental and oral diseases based on clinical images. The dataset, consisting
of 13,138 images sourced from Kaggle and the Dental and Oral Hospital of
Universitas Sumatera Utara, was split into training, validation, and testing sets.
The Models were trained using various hyperparameter combinations and
evaluated with F1-score, precision, and recall. The best result was achieved by the
MobileNetV3Large architecture with a test Accuracy of 0.949. This research
demonstrates the effectiveness of the proposed method for disease classification
and its potential for deployment in AI-based diagnostic systems.95 PagesSkripsi Sarjan