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Bow Hand Stability Monitoring System For Archery Athletes Using Accelerometer
No full textStability of motion takes a crucial role in determining archery shot quality, requiring coaches and athletes to have an objective and real-time monitoring method to improve training performance. This system was developed using an MPU-6050 accelerometer mounted on the bow riser to measure hand-movement coordinates during the drawing phase. Sensor data are transmitted via the MQTT protocol and visualized on a dashboard in the form of line graphs. The study involved field trials in collaboration with archers from Universitas Sumatera Utara (USU), specifically in the standard bow and barebow divisions. The system is capable of recording time, accelerometer reading statistics, shot scores, and stability levels. Experimental results indicate that the variable most closely correlated with shot score is time, with a Pearson Correlation Coefficient of 0.2. Additionally, stability was found to be inversely related to amplitude, with a strong negative Pearson Correlation Coefficient of −0.95.68 PagesSkripsi Sarjan
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
A Social Capital and Social–Ecological System Based Model for Social Forestry Management in North Sumatra
No full textSocial Forestry (SF) is a strategic policy for community-based forest
management that aims to improve local livelihoods while safeguarding the ecological
functions of forests. The implementation of SF in North Sumatra demonstrates varying
degrees of success, influenced by differences in ecological conditions, socio-cultural
characteristics, institutional capacity, and the dynamics of actor relations. This study
aims to formulate a sustainable Social Forestry management model based on social
capital and the Social-Ecological System (SES) framework.
The research was conducted between 2022 and 2024 in five SF schemes:
Customary Forest (HA), Village Forest (HD), Community Forestry (HKm), Community
Plantation Forest (HTR), and Conservation Partnership (KK). A mixed-methods
approach with a sequential quantitative–qualitative design was employed. Quantitative
analysis examined vegetation composition and structure as a proxy for ecological
conditions, and measured social capital among Social Forestry permit holders.
Qualitative data were collected through in-depth interviews, focus group discussions,
and expert judgement to identify key variables, actor roles, and SES elements within SF
management.
The results indicate that each SF scheme exhibits distinct ecological and
institutional characteristics. Social capital, both cognitive and structural, plays a
critical role in strengthening governance, enhancing participation, and stabilizing
collective action. The SES analysis demonstrates that SF sustainability is shaped by the
interaction among forest resources, resource users, infrastructure providers, and public
infrastructure. However, the conventional SES framework has limitations in capturing
socio-economic dynamics. This prompted the development of an extended SES+E
approach that explicitly integrates economic dimensions as determinants of
management behaviour.
This study proposes a sustainable Social Forestry management model that
prioritizes social capital strengthening, multi-level governance integration, and
contextualized approaches tailored to institutional typologies in North Sumatra.216 PagesDisertasi Dokto
Antimicrobial Activity Test of Bangun-bangun Leaf Extract (Coleus Amboinicus L.) against Several Clinical Pathogenic Microbial Isolates
No full textColeus amboinicus Lour., commonly known in North Sumatra as “daun bangun-bangun,” is an aromatic plant from the Lamiaceae family traditionally used as an anti-infective, anti-inflammatory, and wound-healing agent. Its biological activities are primarily attributed to its secondary metabolite content, including flavonoids, tannins, saponins, alkaloids, phenolics, and essential oils. This study aimed to evaluate the antimicrobial activity of ethanol, ethyl acetate, and n-hexane extracts of C. amboinicus leaves against clinically relevant pathogenic microorganisms, namely Escherichia coli, Staphylococcus aureus, and Candida albicans. Antimicrobial activity was assessed using the disc diffusion method with extract concentrations of 10%, 15%, 20%, and 25% following the Kirby–Bauer procedure. The test microorganisms were clinical pathogens known to exhibit resistance to several commercial antibiotics. The results demonstrated that all extracts were capable of inhibiting microbial growth, with increasing effectiveness at higher extract concentrations. The ethyl acetate extract exhibited the strongest inhibitory activity against all tested microbes, producing larger zones of inhibition compared with the ethanol and n-hexane extracts. The highest antimicrobial effect was observed in the ethanol extract at 25% concentration against the Gram-positive bacterium S. aureus, and in the ethyl acetate extract against C. albicans. The diameter of the inhibition zone increased proportionally with extract concentration. Overall, C. amboinicus leaves possess promising potential as a natural source of antimicrobial agents effective against Gram-positive bacteria, Gram-negative bacteria, and pathogenic fungi.51 PagesSkripsi Sarjan
The Influence of Work Environment and Adaptive Leadership Style on Job Satisfaction and Employee Performance at PT PP London Sumatra Indonesia Tbk, Bah Lias Estate, Division 3 Manahul
No full textThis study aims to analyze the influence of the work environment and adaptive leadership style on job satisfaction and employee performance at PT PP London Sumatra Indonesia Tbk, Bah Lias Estate, Division 3 Manahul, as well as to examine the effect of job satisfaction on employee performance. The sampling method used was simple random sampling with Slovin’s formula, resulting in a sample of 69 plantation employees. The analytical methods employed were Multiple Linear Regression and Simple Linear Regression.
The results showed that both partially and simultaneously, the work environment and adaptive leadership style have a significant effect on job satisfaction and employee performance. Furthermore, job satisfaction was also found to have a significant influence on employee performance. These findings suggest that a better work environment and effective adaptive leadership practices can enhance employees’ job satisfaction and performance in the plantation division.91 PagesSkripsi Sarjan
The Effectiveness of Child-Friendly City Policies in the Special Protection Cluster in Medan City
No full textThe Indonesian government, through the Ministry of Women’s Empowerment and Child
Protection (KPPPA), has developed the Child-Friendly City (CFC) policy as an effort to
create a safe, inclusive, and supportive environment for children’s growth and development.
The indicators of a Child-Friendly City are divided into five clusters, one of which is the
special protection cluster. Medan City is one of the regions designated as a pilot project for
the Child-Friendly City program, considering its status as one of the largest cities in
Indonesia with a high child population.
This study aims to analyze the effectiveness of the Child-Friendly City policy within the
special protection cluster in Medan City, as well as to identify the supporting and inhibiting
factors in its implementation. This research employs a qualitative method, with data analysis
techniques consisting of data reduction, data display, and conclusion drawing.
The findings indicate that the implementation of the Child-Friendly City policy in the special
protection cluster in Medan City has not yet been effective, particularly in terms of
appropriate implementation, appropriate targeting, appropriate environment, and appropriate
process. However, the indicator of appropriate policy has been considered fulfilled.
Supporting factors in the implementation of this policy include the local government’s
commitment to policy evaluation, stakeholder involvement, and the implementation of
development planning meetings (Musrenbang) as a means of community participation.
Meanwhile, inhibiting factors include uneven policy socialization, low public awareness,
and the absence of integrated data on children requiring special protection.150 PagesTesis Magiste
Design of a 4-Meter-High Cantilever Retaining Wall Alternative 1 for Landslide Mitigation Using Analytical Methods and PLAXIS 2D (Case Study: Perkebunan Nusantara, North Sumatra)
No full textLandslides frequently occur in Indonesia due to various factors, including
geological and topographical conditions, high rainfall, volcanic activity, and soil
types prone to failure. Landslides can damage infrastructure and cause economic
losses, as in the case at the palm oil mill owned by Perkebunan Nusantara. A slope
failure on one side of the loading ramp disrupted the production process, requiring
a geotechnical analysis to determine an appropriate reinforcement alternative so
that the ramp could operate again.This study aims to analyze slope stability under
existing conditions and after reinforcement. The analysis was conducted using two
methods: manual calculation and numerical modeling with PLAXIS 2D 2024.2
software. The results from both methods were compared to evaluate the
effectiveness of the planned reinforcement.Based on the analysis, the safety factor
of the original slope was found to be below the required standard (SF < 1.5),
indicating that the slope was vulnerable to landslides. After reinforcement with a
cantilever retaining wall based on the proposed design, the safety factor increased
to 1.506 under static conditions and 1.160 under seismic loading. Both values meet
the stability criteria.Therefore, the cantilever retaining wall proved effective in
improving slope stability and reducing landslide potential. This solution is expected
to support smooth operations at the loading ramp and serve as an alternative
method in slope reinforcement planning as well as a reference for landslide
mitigation using retaining walls.152 PagesSkripsi Sarjan
Legal Protection Of Customary Land (Golat) Of The Batak Indigenous Community Against Monument Development Based On The Customary Law System In Indonesia (A Study Of Supreme Court Decision Number 529 Pk/Pdt/2020)
No full textLand ulayat or Golat in the customary law community of Batak Toba
refers to communal land collectively controlled by the descendants of the village
(huta) founder, holding significant economic, social, and spiritual value for the
survival and identity of the clan. In the era of increasingly rapid national
development, the existence of customary land rights faces various challenges,
including conflicts with infrastructure development and other economic interests.
This research aims to analyze the position of the village head in the land ulayat
(Golat) control system of Batak custom, the inheritance system of land ulayat
(Golat) in land ownership based on Batak customary law, and the analysis of
judges' considerations in providing legal protection for land ulayat (Golat) of the
Batak customary community based on Supreme Court Decision Number 529
PK/Pdt/2020.
This research is a normative juridical legal research that is descriptive in
nature. The data used are primary and secondary data with data collection
techniques through literature study and interviews as supporting data, then
qualitative data analysis was conducted.
The research results show that the Village Head in the Batak customary
land ulayat control system is positioned as a liaison between the customary law
system and the state law system, with administrative authority to provide written
statements, facilitate data collection and mapping of land ulayat, as well as
preventive and responsive responsibilities in preventing violations and resolving
disputes through customary deliberation, but not as the owner because land
ulayat remains communal property of the customary law community. The land
ulayat inheritance system in Batak customary law adheres to the patrilineal
principle that bequeaths land to male children as successors of the clan. The
judges' considerations in Supreme Court Decision Number 529 PK/Pdt/2020,
which upheld the granting of the unlawful act lawsuit, contain fundamental
weaknesses because they erroneously interpreted land ulayat as exclusive
property of one lineage, ignored the 1994 and 2013 clan agreements that stated
the equality of the four children of Toga Gultom, qualified the construction of a
monument to honor ancestors as an unlawful act when it is actually a cultural
right guaranteed by customary law, ignored previous decisions that had obtained
permanent legal force, and insufficiently encouraged resolution through
customary deliberation, thus failing to provide substantive justice and potentially
sharpening internal conflicts within the clan122 PagesSkripsi Sarjan
The Effect of Gamma Ray Irradiation on the Morpho-agronomic Characteristics of Rice (Oryza sativa L.) Cultivar Sipulo Bontar
No full textSANDI PASKAH MARPAUNG. The Effect of Gamma Ray Irradiation on the Morpho-agronomic Characteristics of Rice (Oryza sativa L.) Cultivar Sipulo Bontar (Under the supervision of MUHAMMAD SYAHRIL as the Supervisory Committee).
This study aims to determine the LD50 value and the effect of gamma irradiation on the morpho-agronomic characteristics of Sipulo Bontar rice cultivar in the M1 generation. The study was conducted at Jalan Pasar 1 No. 296, Tj. Sari, Kec. Medan Selayang, Medan City from March to October 2025. The LD50 value was determined using Curve-Fit analysis, while the field experiment used a non-factorial Randomized Block Design (RBD) with four levels of gamma radiation treatment, namely G0 (Control), G1 (100 Gy), G2 (200 Gy), and G3 (300 Gy). The results showed that the LD50 value of the Sipulo Bontar rice cultivar based on the germination percentage parameter was 206.24 Gy. The results of the analysis of variance showed that gamma irradiation treatment had no significant effect on the number of tillers, number of productive tillers, and weight of 1000 grains. However, radiation had a significant to very significant effect on the characteristics of flowering age, harvest age, panicle length, total grain number per panicle, filled grain number per panicle, empty grain number per panicle, and grain weight per cluster. Treatment G1 (100 Gy) was the best treatment because it was able to induce early maturity while maintaining fertility (number of filled grains) equivalent to the control plants, despite a decrease in yield due to high sterility rates.61 PagesSkripsi Sarjan
Evaluation of Land Suitability for Sugarcane Crops (Saccharum officinarum L.) on Oxisols in Sudi Rejo Village Namorambe
No full textThe large land potential in North Sumatra contributes minimally to national sugar production, especially in Sudi Rejo Village; sugarcane cultivation is limited to only yards or a plot of land. Therefore, a land suitability evaluation for sugarcane in that village needs to be conducted. This research aims to determine the actual and potential land suitability classes for sugarcane at different slope gradients in Sudi Rejo Village, Namorambe District. This research uses a survey method with soil sampling on five Land Map Units (SPL). The classification of land suitability classes uses the matching method, which matches the value of land quality and land characteristics with the land suitability criteria for sugarcane crops. The research results show that SPL 1 and SPL 2 have an actual suitability class of Marginally Suitable (S3) with the limiting factors of water availability, oxygen availability, nutrient retention, and sulfidic hazard and a potential suitability class of Marginally Suitable (S3) with the limiting factor of oxygen availability. SPL 3 has an actual suitability class of Marginally Suitable (S3) with the limiting factors of water availability, oxygen availability, rooting media, nutrient retention, and sulfidic hazard and a potential suitability class of Marginally Suitable (S3) with the limiting factors of oxygen availability and rooting media. SPL 4 has an actual suitability of Marginally Suitable (S3) with the limiting factors of water availability, oxygen availability, rooting media, nutrient retention, sulfidic hazard, and erosion hazard and a potential suitability class of Marginally Suitable (S3) with the limiting factors of oxygen availability and rooting media. SPL 5 has an actual suitability class of Not Suitable (N) with the limiting factor of erosion hazard and a potential suitability of Marginally Suitable (S3) with the limiting factor of erosion hazard73 PagesSkripsi Sarjan