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Distance-based Indoor Localization using Empirical Path Loss Model and RSSI in Wireless Sensor Networks Dwi Joko Suroso; Muhammad Arifin; Panarat Cherntanomwong
Journal of Robotics and Control (JRC) Vol 1, No 6 (2020): November
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jrc.1638


Wireless sensor networks (WSNs) have a vital role in indoor localization development. As today, there are more demands in location-based service (LBS), mainly indoor environments, which put the researches on indoor localization massive attention. As the global-positioning-system (GPS) is unreliable indoor, some methods in WSNs-based indoor localization have been developed. Path loss model-based can be useful for providing the power-distance relationship the distance-based indoor localization. Received signal strength indicator (RSSI) has been commonly utilized and proven to be a reliable yet straightforward metric in the distance-based method. We face issues related to the complexity of indoor localization to be deployed in a real situation. Hence, it motivates us to propose a simple yet having acceptable accuracy results. In this research, we applied the standard distance-based methods, which are is trilateration and min-max or bounding box algorithm. We used the RSSI values as the localization parameter from the ZigBee standard. We utilized the general path loss model to estimate the traveling distance between the transmitter (TX) and receiver (RX) based on the RSSI values. We conducted measurements in a simple indoor lobby environment to validate the performance of our proposed localization system. The results show that the min-max algorithm performs better accuracy compared to the trilateration, which yields an error distance of up to 3m.  By these results, we conclude that the distance-based method using ZigBee standard working on 2.4 GHz center frequency can be reliable in the range of 1-3m. This small range is affected by the existence of interference objects (IOs) lead to signal multipath, causing the unreliability of RSSI values. These results can be the first step for building the indoor localization system, which low-cost, low-complexity, and can be applied in many fields, especially indoor robots and small devices in internet-of-things (IoT) world’s today.
Contestation between Puritan Islam and Kejawen in the Urban Yogyakarta of Indonesia Muhammad Arifin; Irwan Abdullah; Atik Tri Ratnawati
Al-Albab Vol 8, No 2 (2019)
Publisher : Graduate Program of Pontianak Institute of Islamic Studies

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (174.931 KB) | DOI: 10.24260/alalbab.v8i2.1460


Tensions between Puritan Islam and Kejawen Islam have never been resolved, despite various accommodation efforts. The ongoing contestation of the two traditions in Islam in Yogyakarta is because both always maintain strict cultural boundaries through symbols that represent their respective identities, be it in religious, art, cultural, economic and political practices. This study focuses on three aspects: (1) the form of representation of the contestation between Islam and Tradition (Kejawen) in the city of Yogyakarta; (2) the historical and cultural context which is the basis for the contestation between Islam and tradition; and (3) how the contestation between Islam and the Kejawen tradition is managed by each community in an effort to minimize the occurrence of social conflict between the two. Through these three aspects, this research aims to offer a new perspective in viewing the dialectical relations between Puritan Islam and Javanese (Kejawen) tradition contextually. The contestation between the Islamic tradition and the Kejawen tradition continued because of historical, political and global currents that provided space for both traditions to build their respective cultural identities.