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All Journal IAES International Journal of Robotics and Automation (IJRA) TELKOMNIKA (Telecommunication Computing Electronics and Control) Proceeding of the Electrical Engineering Computer Science and Informatics
Jazi Eko Istiyanto
Universitas Gadjah Mada
Automotive Engineering Computer Science & IT Electrical & Electronics Engineering

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ALAT PEMANTAU SUHU JARAK JAUH BERBASIS SMS (AN SMS-BASED REMOTEe TEMPERATURE MONITORING DEVICE) Jazi Eko Istiyanto; Eko Purwadi
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 3, No 2: August 2005
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v3i2.1223

Abstract

            A remote temperature monitoring device based on the GSM (Global System for Mobile Communicatiobn) Short-Messaging Services (SMS) has been designed and constructed. The device is controlled by an AVR AT90S2313 microcontroller. Connected to the microcontroller are the temperature sensor and a cellular phone. A user, using another cellular phone, can query the status of the temperature by sending an SMS to the cellular phone attached to the microcontroller. Upon receiving the SMS, the device will read the SMS, interpret the SMS content as a command to access the temperature readings, compose a reply SMS and command the attached cellular phone to send the SMS to the querying cellular phone. The device has been implemented and tested on a series of Siemens cellular phones and has shown a good performance with the only predominant limitation being the availability and signal strength of the GSM infrastructure.  
The Use of KPI in Group Decision Support Model of ICT Projects Performance Evaluation Herri Setiawan; Jazi Eko Istiyanto; Retantyo Wardoyo; Purwo Santoso
Proceeding of the Electrical Engineering Computer Science and Informatics Vol 2: EECSI 2015
Publisher : IAES Indonesia Section

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (348.728 KB) | DOI: 10.11591/eecsi.v2.497

Abstract

This paper proposes The Use of KPI in Group Decision Support System Model of ICT Projects Evaluation at Local Government Agency in Indonesia. This study is a part of the attempt to improve local government performance in Indonesia, especially for Local Government Agencies (SKPD) involved in Decision Support System (SPK), which should be optimized through Information Technology. Different from the prior research, in this paper we try to describe how to determine KPI in an ICT project at local government agency and the applicable evaluation model. Generally, this paper will discuss how to make an performance indicator, so that the output of an ICT project product can result the expected outcome, benefit, and impact. Furthermore, it will be explained in regard to the Group Decision Support System (GDSS) evaluation model by considering the applicable legislation aspect, which facilitates decision makers such as: Government Institution Executives, ICT Managers Unit, Business Process Owner Unit, and Society represented by Regional House of Representative, to give assessment or evaluation upon the implementation of ICT Projects at Local Government Agency. As the research support, survey and interview have been conducted to stakeholders in decision-making. The proposed model is expected to be able to give ideas and solutions in evaluating ICT Projects done at local government agencies in Indonesia.
LiDAR-based sensor fusion and navigation for indoor autonomous mobile robots in warehouse environments Rifda Hakima Sari; Jazi Eko Istiyanto; Oskar Natan; Zaidan Hakim; Danang Lelono; Andi Dharmawan
IAES International Journal of Robotics and Automation (IJRA) Vol 15, No 2: June 2026
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijra.v15i2.pp295-306

Abstract

An indoor navigation system for an autonomous mobile robot was developed using LiDAR-based perception and multi-sensor fusion. The system combines 2D LiDAR, inertial measurement unit (IMU), and wheel encoder measurements within a simultaneous localization and mapping (SLAM) framework to support real-time localization, while the ROS2 Nav2 stack manages global path planning and local obstacle avoidance through A*-based planning and costmap-driven control. Evaluation in a warehouse-like environment showed that the robot maintained stable localization with low drift and completed autonomous navigation missions with a success rate of 93.33%. During operation, the robot was able to avoid static obstacles consistently and adjust its trajectory in response to simple dynamic obstacles through online replanning. These results indicate that the proposed system is suitable for practical indoor logistics scenarios requiring reliable navigation in structured environments. At the same time, the findings suggest the need for further improvement to handle environments with higher dynamics and denser obstacle configurations.
Hybrid LUT–CORDIC architecture on FPGA for efficient and accurate trigonometric computation in robot manipulators Nia Gella Augoestien; Jazi Eko Istiyanto; Ahmad Ashari; Andi Dharmawan
IAES International Journal of Robotics and Automation (IJRA) Vol 15, No 2: June 2026
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijra.v15i2.pp377-387

Abstract

Although computational resources on robots are often limited, real-time, accurate computation of trigonometric functions is essential in robot manipulators, particularly for forward and inverse kinematics, dynamic analysis, trajectory planning, and motion control. The LUT method requires a large number of LUTs to improve accuracy. The accuracy of the CORDIC method is highly dependent on the number of computational latencies, which affects the computation speed. This paper combines two general approaches for computing trigonometric functions on robot manipulators that improve accuracy without increasing resource utilization and computational latencies. The design uses a 10-bit format (0.125° input resolution and 2-10 output precision) and is implemented in VHDL on a Xilinx Artix-7 XC7A100T-CSG324 FPGA. Compared with a CORDIC-only baseline, the maximum absolute error is reduced from 0.083007812 to 0.009801151 for sine and from 0.079101563 to 0.008901377 for cosine, while MSE drops from 2.4031×10-4 and 2.32974×10-4 to 5.87754×10-6 and 5.87862×10-6, respectively. The hybrid core also reduces slice usage from 81 to 69 and shortens computation time from 35.271 ns to 30.627 ns, making it suitable for resource-constrained real-time robotic control.
Co-Authors Ahmad Ashari Andi Dharmawan Eko Purwadi Herri Setiawan Nia Gella Augoestien Oskar Natan Retantyo Wardoyo Rifda Hakima Sari Santoso, Purwo Zaidan Hakim