Articles

Assessing Performance and Equity of Grade Separators in Heterogeneous Traffic: An Ex-Post Evaluation

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This paper presents an ex-post-performance evaluation of four grade separators (flyovers) in Nagpur, India, focusing on equity and efficiency in heterogeneous traffic. Using the moving observer method and six performance indices, the study compares access- controlled (above-grade) and residual (at-grade) link performance during peak hours.

The analysis reveals that while flyovers benefit faster motorized traffic, they significantly increase delays and unreliability for at-grade users (including NMTs) by reducing effective carriageway width. The study concludes that flyovers are non-equitable interventions that marginalize slower modes. These results highlight the need for decision-makers in developing economies to rethink urban interventions to ensure benefits are distributed across all transport modes.

Optimal Control Strategy to Analyse the Networked Control System Stability

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It is crucial to preserve the networked control systems (NCS) transient performance and stability because adding uncertain parameters degrades system performance and introduces instability. Thus, the analysis of NCS system performance under uncertain conditions, such as disturbance, is the focus of this paper. The performance of NCS is demonstrated using control action and some appropriate stability conditions.
The simulation diagram in result section displays effectiveness of proposed methodology and shows a comparative analysis of the response signal with and without control action along with disturbance in NCS. Experiments conducted in the MATLAB Simulink environment demonstrate the efficacy of the suggested methodology.

Performance Improvement of Procurement Activities in Reaching KPI On-Time Delivery and Purchase Requisition to Purchase Order by Implementing E-RFQ Tools and Developing Team Collaboration and Communication

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Procurement activity in for an aircraft industry in Indonesia has suffered most during pandemic few years ago. The progress of Procurement at certain company is not that different. Moreover, one of the main problems in Procurement Division at the company is KPI On-Time Delivery target has not yet been achieved for aircraft commodities, especially for AEI. During these last 5 years, the procurement progress only achieved 48,5% on time, while the target is above 90% of total procurement activity. So far, mitigations has already been taken in order to reduce the delay rate. It give an impact, but the delay rate is higher than the target. The purposes of this study is to increase the On-Time progress and decrease the delay. this study uses conduct several analyses. Internal analysis using SWOT analysis method, while finding the root cause use method 5 Why’s Analysis method. Also, there are quantitative analysis and qualitative analysis. Qualitative analysis is done by using DMAIC Method to analyze the problem in a larger scope, while quantitative analysis is done to analyze the procurement data with Regression Analysis. The root cause of it was PR which could not be converted to PO because of the long-lasting RFQ and EQ process. The second root cause is miscommunication in the preparation of ordering aircraft materials. For the issue of the RFQ and EQ process is solved by developing and using e-RFQ Evaluation Tools to make sure that the quotation process and feedback from the supplier are done faster than using the manual method. For the miscalculation problem with improving teamwork and communication. The recommendation is to conduct research further regarding strategy purchasing.