INFLUENCE: INTERNATIONAL JOURNAL OF SCIENCE REVIEW

Comparative Evaluation of Chiller System Performance with and Without Smart Chiller Control Implementation

2026-07-16T07:40:56+00:00

Chiller systems are a major component of HVAC systems and account for a significant portion of building energy consumption; therefore, efforts to improve efficiency are required through the implementation of Smart Chiller Control. This study aims to evaluate the performance of chiller systems before and after the implementation of Smart Chiller Control based on cooling capacity, power consumption, Energy Efficiency Ratio (EER), efficiency ratio (kW/TR), and power savings. The study utilized actual operational data from three chiller groups, namely CG03, CG09, and CG15. The results showed that cooling capacity increased from 6,664.17 kW to 8,167.02 kW for CG03, from 8,035.03 kW to 10,894.99 kW for CG09, and from 7,296.20 kW to 8,109.69 kW for CG15. The EER values increased from 14.74 to 15.76 for CG03, from 16.47 to 19.55 for CG09, and from 15.49 to 17.60 for CG15, while the kW/TR values decreased from 0.81 to 0.76 for CG03, from 0.72 to 0.61 for CG09, and from 0.77 to 0.68 for CG15. Baseline predictions using linear regression indicated power savings of 106.73 kW (6.92%) for CG03, 218.57 kW (13.09%) for CG09, and 171.51 kW (11.30%) for CG15. The findings demonstrate that Smart Chiller Control can improve both the performance and energy efficiency of chiller systems.

Quality Control Analysis to Reduce Defects in Drawn Textured Yarn Products Using the Six Sigma Method (DMAIC)

2026-07-19T03:43:54+00:00

PT XYZ is a company engaged in the production of Drawn Textured Yarn (DTY) that continued to experience a high level of product defects, particularly the Dyeing Reject defect type, which accounted for 91.712% of total defects during the January-December 2025 period. This condition indicated that the production process was not yet statistically stable and operated at a low sigma capability level of 2.68 sigma. This study aimed to identify the root causes of defects and to formulate improvement proposals to reduce the number of defective products in the DTY production process using the Six Sigma method with the DMAIC (Define, Measure, Analyze, Improve, Control) approach. In the Measure stage, process stability was assessed using a P-Control Chart, along with DPMO and sigma-level calculations. In the Analyze stage, root causes were identified using a Pareto Diagram, a Fishbone Diagram, and Failure Mode and Effect Analysis (FMEA). The results showed that the root causes originated from machine, man, material, and method factors, with a total Risk Priority Number (RPN) of 2,155. In the Improve stage, improvement proposals were developed using 5W+1H analysis, which reduced the total RPN to 454, a decrease of 1,701 points (78.9%). The Control stage focused on process standardization, continuous monitoring, and operator training to sustain the improvements achieved and to drive the production process toward a zero-defect target.

Break Even Point and Margin of Safety Analysis at Cangkir Pertama Coffee Shop, Purwakarta

2026-07-19T04:28:55+00:00

Coffee Shop Cangkir Pertama was a local coffee shop business in Purwakarta operating since 2019, but its financial management remained simple, without a systematic break-even or sales safety margin analysis, so management could not determine the minimum sales volume needed to avoid losses or gauge the safety of its financial condition against a potential sales decline. This study analyzed the minimum sales volume based on the Break-Even Point (BEP), analyzed the sales safety margin based on the Margin of Safety (MOS), and evaluated the level of safety and feasibility of the business through the integration of both methods. This research used a descriptive quantitative method with primary and secondary data on sales and operational costs for the period of March 2025 to February 2026, collected through interviews, observation, and documentation, then analyzed using BEP, MOS, and Contribution Margin calculations. The results showed that the average quarterly BEP was IDR42,533,333 or 1,519 units, with an average MOS of 62.03% and a Contribution Margin Ratio of 75%. Annual revenue of IDR448,476,000 far exceeded the annual BEP of IDR170,133,333, indicating that Coffee Shop Cangkir Pertama was in a healthy, safe, and viable financial condition.

Cone Crusher Machine Maintenance Analysis Using Overall Equipment Effectiveness (OEE) and Six Big Losses Method to Improve Machine Effectiveness at PT Selo Agung

2026-07-19T06:42:52+00:00

PT Selo Agung is a company engaged in andesite stone mining located in Plered, Purwakarta Regency, West Java. Its cone crusher machine plays a vital role in crushing andesite stone into construction material, but its performance is frequently hindered by component failures and suboptimal maintenance activities, resulting in high downtime and disrupted production. This study aims to analyze the effectiveness of the cone crusher machine using the Overall Equipment Effectiveness (OEE) method, identify the factors causing the decline in production effectiveness through Six Big Losses calculation, and propose improvements to enhance machine effectiveness. Historical data from February 2025 to January 2026 were processed by calculating Availability, Performance Efficiency, and Quality Ratio, followed by Six Big Losses analysis, a fishbone diagram, and improvement proposals using the 5W+1H method. The results show that the average OEE value of the cone crusher machine was only 56.10%, far below the JIPM world-class standard of 85%, falling into the Unacceptable category. Availability at 67.86% was the largest contributor to the gap, followed by Performance Efficiency at 85.14% and Quality Ratio at 97.08%. Equipment Failure (Breakdown) Losses was identified as the most dominant loss, contributing 53.08% of total losses, mainly caused by the absence of scheduled preventive maintenance. The proposed improvements include implementing scheduled preventive maintenance with periodic replacement of the mantle and concave, developing a written maintenance SOP, operator training, and stabilizing material supply along with regular Closed Side Setting (CSS) calibration. Consistent long-term implementation (12-18 months) of these proposals is projected to raise the OEE value from 56.10% to 83.05%, approaching the world-class standard.

Ustadz Musgianto Rafiq's Da'wah Method in the Routine Study of PDAM Tirtanadi Employees on the Development of Tauhid Values and Islamic Work Ethics

2026-07-22T11:34:20+00:00

This study aims to analyze Ustadz Musgianto Rafiq's da'wah methods in routine studies of PDAM Tirtanadi employees and their impact on fostering the values of monotheism and Islamic work ethic. The study used a descriptive qualitative approach with data collection techniques through observation, interviews, and documentation. The results show that the da'wah methods used include lectures (bil-lisan), mau'izah hasanah, and interactive questions and answers. The material presented emphasizes strengthening monotheism and Islamic work ethic values such as honesty, trustworthiness, and responsibility. These routine studies have a positive impact on increasing spiritual awareness and work motivation of employees within the company environment.

Analysis of Potential Hazards in Pipe Receiving Work Using the Job Safety Analysis (JSA) Method and the ISO 45001 Approach at PT. XYZ

2026-07-22T12:39:43+00:00

Pipe receiving is one of the operational activities with a high potential for occupational hazards because it involves unloading, lifting, transporting, and storing pipes using lifting equipment, as well as direct interaction between workers and heavy materials. Unsystematic hazard identification and control can increase the risk of workplace accidents, material damage, and operational disruption. This study aims to identify potential hazards at each stage of the pipe receiving process using the Job Safety Analysis (JSA) method and to evaluate its conformity with the ISO 45001:2018 approach at PT. XYZ. A descriptive method with a qualitative approach was employed. Data were collected through direct observation, interviews with workers and HSSE personnel, and documentation studies. The findings indicate that the pipe receiving process consists of ten work stages with various hazards, including being struck by materials, caught between objects, slipping, falling loads, and collisions with lifting equipment. Recommended control measures include toolbox meetings, equipment inspection, safe work procedures, barricade installation, improved compliance with Personal Protective Equipment (PPE), and regular supervision. The controls applied at PT. XYZ are generally consistent with Clauses 6.1.2, 8.1, and 9.1 of ISO 45001:2018, although continuous improvement in supervision and evaluation is still required.

Utilization of Funds and the Mentoring Process of PNM Mekaar Syariah in Community Economic Empowerment in Panton Teunom Village, Aceh Jaya

2026-07-23T08:33:31+00:00

The scarcity of capital and the suboptimal welfare of underprivileged women necessitate the reinforcement of micro-enterprises, a condition further exacerbated by the diversion of financing funds toward consumptive needs and the inadequacy of business development mentoring modules in Panton Teunom Village, Aceh Jaya. Consequently, this study aims to examine the utilization of financing and the efficacy of the mentoring process within the PNM Mekaar Syariah program in accelerating the economic empowerment of this demographic. Employing a descriptive qualitative approach, data were acquired from six purposively selected informants through structured interviews and documentation. The analytical framework utilized interactive model stages encompassing data reduction, data display, and conclusion drawing. The findings reveal that the majority of the financial allocations were effectively utilized as capital supplements, significantly optimizing inventory capacity, business expansion, and income generation. Furthermore, weekly group mentoring demonstrably fortified disciplinary practices, managerial literacy, and entrepreneurial autonomy, notwithstanding the persistence of consumptive constraints. Ultimately, the program's success in consolidating women's economic resilience dictates a pressing need for policymakers to optimize the oversight of financial literacy and integrate an advanced business incubation curriculum, thereby ensuring the long-term sustainability of micro-enterprises.

Quality Control Analysis to Minimize Defective Products Using the Failure Mode and Effects Analysis (FMEA) Method in the Karya Raharja Village-Owned Enterprise (BUMDES) Convection Business

2026-07-23T08:56:48+00:00

The convection business unit operated by BUMDes Karya Raharja, located in Galudra Village, Pondok Salam Subdistrict, Purwakarta Regency, continues to face a high defect rate, averaging 15.52% per month, due to limited resources, the absence of standard operating procedures (SOPs), and a quality control system that has not been implemented optimally. This study aims to identify the failure modes occurring in the convection production process, assess their risk levels using the Failure Mode and Effect Analysis (FMEA) method, and formulate improvement proposals to reduce the defect rate. A descriptive case-study approach with a mixed-method design was employed, combining quantitative data on production and defect volumes with qualitative data obtained through observation and interviews across four production stages: cutting, sewing, finishing, and packing. Process FMEA (PFMEA) was applied to calculate the Risk Priority Number (RPN) for each failure mode, followed by the development of corrective actions using the 5W+1H approach. The results identified six failure modes with RPN values ranging from 108 to 280. Four failure modes were categorized as high priority (RPN ≥ 200): defective/stained fabric passing through to the finishing stage (RPN 280), loose or broken sewing thread (RPN 256), untidy stitching (RPN 252), and cut-fabric dimensions not matching the pattern (RPN 210). The sewing and finishing stages were identified as the critical points in the production process. The resulting improvement proposals are practical and do not require significant investment or complex systems. This study demonstrates that FMEA can be effectively applied in a resource-limited, village-owned enterprise (BUMDes) convection business.

Critique and Reinterpretation of Misogynistic Hadith: An Analysis of Islamic Justice and a Gender Perspective

2026-07-23T09:24:15+00:00

This article aims to reexamine hadiths that are often perceived as misogynistic through the lens of Islamic justice and a gender perspective. The main focus of this study is two hadiths in Sahih al-Bukhari, namely hadith number 304 concerning women being described as “deficient in intellect and religion”, and hadith number 7099 regarding female leadership. This research employs a qualitative method with a library research approach, along with thematic hadith analysis (maudhu’i). The data are analyzed by referring to classical commentaries, particularly Fath al-Bari by Ibn Hajar al-Asqalani, in order to understand the historical context and substantive meaning of the hadiths. The findings indicate that a purely textual understanding of these hadiths has the potential to generate gender bias, however, through contextual and interpretive approaches, it is found that the meanings of the hadiths do not contradict the principles of justice in Islam. Therefore, reinterpretation becomes essential to present a more proportional, contextual, and relevant understanding in line with contemporary gender discourse without neglecting the authority of the Islamic scholarly tradition. In addition, this study emphasizes the importance of integrating classical and contemporary approaches as a methodological effort to avoid distortion of meaning and to strengthen the relevance of hadith studies in addressing modern social issues.

Customer Satisfaction Analysis with Servqual and Kano Model Integration to Improve the Quality of Online Transportation Services

2026-07-23T09:41:59+00:00

The growth of online transportation services has intensified competition among providers while generating various user complaints, making service quality evaluation increasingly important, particularly in developing regions such as Purwakarta Regency, where user characteristics differ from those in major cities. This study aims to analyze customer satisfaction and determine service improvement priorities for online transportation through the integration of the Service Quality (SERVQUAL) Gap 5 method and the Kano Model. A quantitative approach was employed using primary data from 100 respondents selected through purposive sampling. The instrument was a structured questionnaire measuring 15 service attributes across five SERVQUAL dimensions, and it was proven valid and reliable. The SERVQUAL analysis yielded an average perception score of 3.40 and an expectation score of 3.44, with a total gap of -0.05, indicating that service performance remains slightly below customer expectations. Of the 15 attributes, 8 showed negative gaps, with the largest found in pickup punctuality (-0.22), local route mastery (-0.19), and fare transparency (-0.14); at the dimensional level, the largest gap occurred in the Reliability dimension (-0.11). Integration with the Kano Model identified two Must-be attributes as the top improvement priorities, pickup punctuality and drivers’ mastery of local routes, while six other Indifferent attributes only need to be maintained and monitored. This study confirms that integrating SERVQUAL and the Kano Model can not only identify problematic attributes but also determine improvement priorities more strategically.

Occupational Safety and Health Risk Analysis on Slitter Machines Using the HIRADC and Job Safety Analysis Method at PT KYI

2026-07-21T04:33:35+00:00

Increasingly tight competition in the manufacturing industry requires an optimal Occupational Safety and Health (OSH) system to prevent workplace accidents. This study aims to identify hazard potentials, assess risk levels, and formulate risk-control recommendations for the operation of the slitter machine at PT KYI. A descriptive qualitative-quantitative approach was applied at the Carton Department of PT KYI, Purwakarta, from September 2025 to January 2026. Primary data were obtained through direct observation, interviews with operators and supervisors, and company documentation, then analyzed using the Hazard Identification, Risk Assessment and Determining Control (HIRADC) method and Job Safety Analysis (JSA) with a likelihood-severity risk matrix. The results identified seven major hazard potentials in cutting, adjustment, and material-handling activities, five of which fall into the high-risk category and two into the moderate category. A 5M cause analysis (man, machine, method, material, environment) revealed the human factor as the most dominant cause. The proposed controls include engineering measures such as machine-guard installation, administrative controls through SOP enforcement and safety briefings, and mandatory, consistent use of personal protective equipment. Implementing these controls is expected to sustainably reduce the level of accident risk on the slitter machine.

Quality Control Analysis to Reduce the Number of Defects in DTY Yarn Products Using the Six Sigma (DMAIC) Method at PT. XYZ

2026-07-23T10:26:07+00:00

This study aims to identify the dominant types of defects, analyze the root causes of product defects, and propose quality improvement recommendations to reduce the defect rate of DTY products. The research employed the Six Sigma method using the Define, Measure, Analyze, Improve, and Control (DMAIC) approach integrated with Failure Mode and Effect Analysis (FMEA). In the Define phase, the production process was identified through a SIPOC diagram and the determination of Critical to Quality (CTQ) characteristics. The Measure phase included the calculation of defect proportions, control charts, Defects per Million Opportunities (DPMO), sigma level, and process capability. The Analyze phase utilized Pareto diagrams, Fishbone diagrams, and FMEA to identify the root causes of defects and determine improvement priorities based on the Risk Priority Number (RPN). The Improve phase generated improvement recommendations using the 5W+1H approach, while the Control phase provided recommendations to sustain the implemented improvements. The results showed that during the January–December 2025 period, total production reached 3,793,630 kg, with 116,148 kg of defective products, resulting in a defect rate of 3.06%, which exceeded the company's maximum tolerance limit of 1%. Pareto analysis identified four dominant defect types: Dyeing Reject (31.73%), Damaged (23.76%), DP Handling (23.25%), and Cutting (20.39%). The FMEA results indicated that the highest-priority risks were Dyeing Reject caused by misthreading and Cutting caused by material property problems, both with an RPN value of 300. The proposed improvements focus on enhancing operator competence through training, ensuring consistent implementation of Standard Operating Procedures (SOPs), performing preventive machine maintenance, strengthening raw material quality control, improving workplace cleanliness, and enhancing production process supervision. The implementation of these recommendations is expected to reduce product defects, improve process capability, and support the achievement of product quality standards established by the company.

Analysis of T-Shirt Product Quality Control to Minimize Defects Using Fault Tree Analysis (FTA) and Failure Mode and Effects Analysis (FMEA) at CV Dwiputra Ihwa

2026-07-23T10:38:46+00:00

CV Dwiputra Ihwa is a company that operates in the garment industry, specifically producing T-shirts based on special orders or in large quantities. From June 2025 to May 2026, the percentage of defective products was 7.6% out of a total production of 18,478 units. This situation leads to more rework, waste of raw materials, and lower production efficiency. This study aims to find out which type of defect is most common, look into why these defects happen, and figure out what improvements should be done first to make the T-shirt product better. The study uses a descriptive method with a qualitative approach through a case study. Data was collected through observation, interviews, and document study, then analyzed using Pareto Diagram, Fault Tree Analysis, and Failure Mode and Effect Analysis. The Pareto chart analysis shows that stitching defects (43%) and inaccurate screen-printing defects (37%) are the two main types of defects, contributing about 80% of all defective products. The FTA analysis shows that the second type of defect is caused by a combination of human factors, methods, materials, and machines (4M), with human factors and methods being the most significant causes. The FMEA analysis results show that the Risk Priority Number (RPN) ranges from 30 to 252, with the highest risk cause being overly high production targets (RPN = 252). Based on the research results, it can be concluded that using Pareto Diagram, FTA, and FMEA is effective in identifying types of defects, analyzing root causes, and determining priorities for improvement, which helps support the enhancement of the quality of T-shirts produced by CV Dwiputra Ihwa.

Practice of the Ngalaksa Tradition as a Means of Sociocultural Education in Rancakalong, Sumedang, West Java

2026-07-23T13:17:31+00:00

The Ngalaksa tradition in Rancakalong District is a manifestation of the cultural identity of agricultural communities that functions as a ceremony of gratitude for harvests as well as a mechanism for strengthening social solidarity. This study aims to reveal the philosophical meaning, historical background, ritual structure, as well as the sociocultural and religious values contained in the tradition. The method used is a qualitative approach with field studies through participatory observation, in-depth interviews with traditional leaders, and documentation and literature studies. The research results show that Ngalaksa was born from historical reflection on past food crisis trauma and functions as a spiritual preventive instrument to maintain harmony between humans, nature, and God. Socioculturally, this tradition maintains mechanical solidarity through mechanisms of mutual cooperation (gotong royong), deliberation (badanten), and inclusivity of cross-generational participation. Modern adaptations such as the use of technology and formalization of organization strengthen Ngalaksa's cultural resilience amidst globalization. The research conclusion emphasizes the importance of integrating this local wisdom into formal education and digital documentation for sustainable local identity preservation.