Buck-Boost Converter Using Control Proportional Integral Derivative (PID)

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Solar Power Plantsare systems A power plant that utilizes energy from light the sun to produce electrical energy. But often a problem was found, where the resulting output voltage not constant. For this reason, the Buck-Boost circuit is used converter, a piece of equipment that has a converting function the varying DC input voltage becomes a voltage constant DC output. In this research, a simulation was carried out to a buck-boost converter using PID control. Design simulated with Proteus 8.9. Input voltage setting is the main objective in analyzing success simulation series created. Selection of PID control constants the right one will produce a buck-boost output voltage the converter matches the setpoint and gets a response stable output voltage. By using the trial method and error obtained that with the PID constant, namely Kp = 1.0, Ki=0.01, Kd = 0.1 and for an input voltage range of 12 volts up to 40 volts, the simulation results show that the voltage The output is relatively constant, namely 24 volts with a load test fixed and variable loads.

Cost Optimization and Risk Management Program for the Fuel Supply Network in an Oil & Gas Swamp Operation

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Marine activity is a critical part of an oil & gas company that operates in the swamp area. The company utilizes rigs, barges, and boats to achieve maximum production. Fuel supply for marine fleets is highly essential to ensure smooth operation. Since fuel cost becomes one of the biggest components of operating expenses (OPEX), the stakeholders highly encourage cost optimization programs to ensure business profitability. However, any optimization program shall have a robust risk management program to avoid disturbance in the operation and potential financial losses.

The research aims to select the best fuel supply network in the swamp operation area of an oil & gas company using four criteria (operational expenses, service reliability, value creation, and health safety & environment) based on the literature review and subject matter experts’ analysis. The study will analyze several alternatives using the Analytical Hierarchy Process (AHP) as a decision-making tool and Failure Mode Effect Analysis (FMEA) as the risk management method. The result shows that the hybrid network has the highest rating in AHP with a 33.7% rating and the lowest total risk priority number with 212 points.

Improvement of Strategic Negotiation on Collective Labor Negotiation Process at PT. Layar Berkembang Indonesia

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Collective Labor Agreement Negotiation process is a mandatory for employers and workers in Indonesia as stipulated under Labor Law No:13 Year 2003 and further regulated under Ministry of Manpower Regulation (PERMENAKER) No:28 Year 2014. Through this Collective Labor Agreement process, unions continue to fight for the intrinsic rights of worker’s welfare such as salary increase, better medical health facility, transport allowance, meal allowance, terms of employment, and safety policies, ways to balance work and family, and more. From the employers’ perfective, Collective Labor Agreement negotiation process is very crucial process as the ‘failed negotiation’ could lead to a strike and cessation of company production.

The author conducted gap and data analysis by assessing the current process by referring to prevailing regulations. The author used SWOT analysis to identify the current weaknesses (internal factors) and un-structured negotiation strategy of PT. LAYAR BERKEMBANG Indonesia. External Analysis also being carried out by using PESTLE analysis to support the strategy improvement from different aspects and factors.

To support the implementation of new Negotiation Framework, management of PT. LAYAR BERKEMBANG must take a series of actions and involve all leadership team in this improvement initiatives. HR Department must take lead in this process and align with other stakeholders for the implementation of this new framework so that the next Collective Labor Negotiation process is accountable and align with prevailing regulations in Indonesia.therefore author recommend this method compared to the current simple moving average method.

Feasibility of MHealth Interventions towards Promoting HIV Self-testing Uptake in Sub-Saharan Africa: A Systematic Review of Literature

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Background: HIV self-testing (HIVST) with mobile health technology (mHealth) support is the use of mobile phone-based interventions to complement HIVST in order to improve its efficiency and uptake. Existing reviews leaves a gap in the evidence that summarizes efforts on the feasibility of mHealth to promote HIVST uptake within Sub-Saharan Africa (SSA).

Objective: This study synthesized existing research on the feasibility of mobile health technology (mHealth) aimed at promoting HIV self-testing (HIVST) uptake within SSA using the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines.

Result: Eleven studies met the inclusion criteria and were narratively synthesized, 63% of which were observational studies while 37% were randomized control trials. Mobile applications, SMS or a combination of mHealth strategies were mostly used to promote HIVST uptake. Most studies were carried out in South Africa (54%), and in the general population (54%). Feasibility metrics were inconsistently reported across studies because its definitions varied, nonetheless most studies reported one or more feasibility metrics and HIVST uptake was the most common way (81%) of assessing feasibility.

SMS-based interventions significantly increased HIVST uptake among hard-to-reach populations and were effective for reporting testing outcomes. Mobile applications guided participants through testing, result interpretation, and self-reporting HIVST results, and most studies reported high HIVST uptake (89.0%–100%). Compared to HIVST alone, call-based intervention enhanced HIVST uptake and linkage to care or prevention (p = 0.021). Most studies found combined mHealth interventions highly feasible (78.9%–99.2%).

Conclusion: Feasibility was variable between the diverse mHealth supports used to promote HIVST uptake. While findings pave the way for greater use of mHealth supported HIVST, future research should consider using rigorous research designs and focus on populations disproportionately affected by HIV within diverse SSA regions to ensure broad applicability. Feasibility measures should also be standardized for uniform reporting across studies.

The Role of Shadow Teacher in Inclusive School: A Literature Review

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The importance of the role of special assistant teachers in inclusive schools is interesting to learn, especially in assisting children with special needs this article aims to examine the role of shadow teachers in inclusive schools. The article used in this literature review is an article obtained through Google Scholar by entering the keywords shadow teacher and inclusion school. Based on the results of a literature review of national and international articles that have been conducted, researchers found that there are several roles of special assistant teachers, including planning individual planning programs (PPI), designing assessments and mentoring strategies, modifying teaching materials, and coordinating with other teachers and parents.

The Influence of Principal’s Managerial Skills on Organizational Culture in Public Elementary Schools

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Organizational culture has an important role in improving leadership in schools. The problem in this study is that the organizational culture in public elementary schools in Bandar Lampung city is not optimal. The purpose of this study was to examine the effect of the principal’s managerial skills on organizational culture in public elementary schools in Bandar Lampung city. This research is a type of quantitative research. The study population amounted to 3359 teachers in public elementary schools in Bandar Lampung City with a research sample of 354 teachers. The research instrument used a questionnaire with a Likert scale. Instrument trials were conducted with validity and reliability tests. The data analysis technique used was simple regression. The results showed that there is a significant relationship between the principal’s managerial skills on organizational culture in public elementary schools.

Power Factor Improvement in the New Civil Engineering Building at State Polytechnic of Samarinda

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The State Polytechnic of Samarinda is grappling with reactive power issues, primarily stemming from the considerable number of electrical loads, including computers, fluorescent lamps, printers, air conditioners, and electric motors, present in its buildings and laboratories. As a solution, the installation of a static var compensator (SVC) is proposed to enhance the electrical power factor at the Samarinda State Polytechnic, with a specific focus on the new Civil Engineering Department building. To assess the impact on the power factor, simulations were conducted using MATLAB R2021a Simulink software. The findings reveal that the utilization of a static var compensator resulted in an average power factor increase of 25% across all experiments. However, the targeted power factor of 0.99 was not attained. Furthermore, employing the SVC led to a reduction in current in the R phase by an average of 1.8%, in the S phase by an average of 35%, and in the T phase by an average of 37%. Concurrently, there was an average increase in active power by 3.5%, while apparent power decreased by an average of 14%, and reactive power decreased by an average of 74%. Despite encountering some limitations, the implementation of SVC proved successful in enhancing the power factor in the simulation, presenting a viable solution for improving power quality in the buildings of Samarinda State Polytechnic.

Analysis of Factors Affecting Complaints of Lower Back Pain among Nurses at Bhayangkara Hospital Kendari

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Background: One of the important factors that affect the quality of nurses’ work is occupational health and safety. One of the occupational diseases is Low Back Pain (LBP). Occupations that have a high risk of back pain are nurses. According to the Indonesian Neurological Association (INA) regarding the incidence of lower back pain in hospital nurses, the prevalence of lower back pain cases in nurses in Indonesia shows that 18,2% occurs in men and 13,6% in women. Then, based on the nursing management report at Bhayangkara Hospital Kendari in 2023, most of the nurses’ complaints were lower back pain due to the workload being too high for nurses.

Method: This research was a quantitative analytical research with a cross-sectional design approach. The data analysis was carried out using SPSS statistical tests with multiple linear regression. The population in this study was 102 nurses, while the sample was 102 nurses (total sampling).

Results: The results showed a significant p-value for workload 0,049<0,05, physical activity 0,028<0,05, body position 0,004<0,05, working period 0,048<0,05 and body mass index (BMI) 0,001<0,05.

Conclusion: This research concluded that there was an effect between workload, physical activity, body position, work period and body mass index on complaints of lower back pain in nurses at Bhayangkara Hospital Tk.III Kendari. This research can be a reference material for hospitals, health workers or nurses and can increase knowledge in preventing or reducing the occurrence of lower back pain while working.

Mood States (POMS) Condition Profile Analysis of Senior Women’s Cricket Athletes in East Java before The North Aceh Sumatra PON 2024

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One factor that could affect an athlete’s mental and emotional readiness is mood. Mood profile for Cricket athletes is an important factor that needs to be analyzed. An athlete’s mood can affect their overall performance. A positive mood can increase focus, motivation,and self-confidence, while a negative mood can hinder an athlete’s abilities and affect desired results. The aim of this research is to determine the condition of the Profile of Mood States (POMS) of East Java Female Senior Cricket Athletes before the 2024 Aceh North Sumatra PON. This research method uses descriptive quantitative research with seventeen athletes as the sample in the research and limited only to East Java Senior Female Cricket Athletes. The results of the research shows that the “Medium” category with the highest percentage is the anger indicator (AMR) at 72.27%, and the confused mood indicator (SSB) at 72.10%. Indicators with a medium percentage include indicators of full energy (PNT), self-assessment (PDR), and depression (DPS) of 70.59%. The percentage of fatigue indicators (KLH) was 69.08% and the indicator with the lowest category was the tension indicator (KTG) at 68.07%. The conclusion of the research on Profile of Mood States (POMS) Condition Analysis for East Java Women’s Senior Cricket Athletes before the 2024 Aceh North Sumatra PON was in “Medium” condition. Negative mood conditions in the “Medium” category such as fatigue, anger, tension, confusion and depression indicate that athletes are not feeling stressed mentally and physically. Meanwhile, positive mood conditions in the “Medium” category make athletes have a good mood, such as being full of energy and self-confidence. This is possible because the training portion is good and the conditions for the 2024 Aceh North Sumatra PON are still quite long. So, there are still many athletes who experience good mood conditions.

Effect of Feeding Duration with Different Levels of Culled E. Cottonii on Consumption, Nutrient Digestibility, Growth and Body Composition of Early Weaned Balinese Calves

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The study aimed to evaluate the duration of complete feed containing culled red seaweed (E. cottonii) with different levels on nutrient utilisation, growth and body composition of early weaned Bali cattle calves. A total of 24 Bali cattle calves (initial BW ± 30-40 kg; 2-3 months old) were used in this study. Bali cattle calves were randomly grouped by initial body weight and placed in 4 different treatments following a group randomised design pattern. The 4 treatments were:  CT0 = complete feed containing no cull ECOT; CT5 = complete feed containing 5% cull ECOT; CT10 = complete feed containing 10% cull ECOT and CT15 = complete feed containing 15% cull ECOT. The data obtained were analysed by analysis of variance followed by Duncan’s Multiple Range Test using SPSS 24 software. Feeding ECOT culls with different lengths of time and levels had a significant effect (P<0.05) on increasing consumption and nutrient digestibility of early weaned Balinese calves, but there was no interaction effect (P>0.05) between the length of time and level of ECOT culled on body weight gain and linear body size of early weaned Balinese calves. The same was true for body composition (meat and fat). The treatment also significantly (P<0.05) influenced the increase in bone weight in cattle treated with 5% cull ECOT and 10% cull ECOT. It was concluded that the use of culled ECOT up to 15% in complete feed could not increase the consumption and digestibility of nutrients but the duration of feeding affected the dry matter consumption and bone development of early weaned Bali cattle calves.