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Performance Comparison of Three Modified Howland Current Source Circuits in Low-Cost Bioimpedance Analyzer for Bio-Phantom Signal Acquisition Firmansyah, Eka; Wicaksono, Ridwan
JURNAL INFOTEL Vol 17 No 2 (2025): May
Publisher : LPPM INSTITUT TEKNOLOGI TELKOM PURWOKERTO

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20895/infotel.v17i2.1218

Abstract

Electrical impedance tomography (EIT) supports recent advancements in gastric monitoring for telehealth applications. The challenge in providing low-cost EIT is ensuring a stable current injection over diverse tissue conductivities within the abdominal cavity. Three current source circuits based on Howland's current source are investigated to be applied in a low-cost portable bioimpedance analyzer (p-BIA). Those are: a) triple amplifier Howland current source (TAHCS), b) mirrored Howland current source (MHCS), and c) composite mirrored Howland current source (CMHCS). Evaluation has been conducted based on signal-to-noise ratio (SNR), broadness of the frequency range, and output impedance over frequency value and stability. Due to its high SNR value (82.56 to 102.1 dB), broad (500 Hz to 500 kHz) operating frequency, and consistent output impedance over operating frequency (10 to 25 kΩ), CMHCS is a good option in realizing p-BIA in gastric monitoring based EIT.
Habitus Membentur Field yang Berubah: Sikap Pedagang Kaki Lima Malioboro terhadap Relokasi dalam Kerangka Bourdieu Wicaksono, Ridwan
Dimensia: Jurnal Kajian Sosiologi Vol. 14 No. 3 (2025): Vol. 14 No. 3 (2025): Dimensia: Jurnal Kajian Sosiologi
Publisher : Departemen Pendidikan Sosiologi FISHIPOL UNY

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dimensia.v14i3.87907

Abstract

Penelitian ini berangkat dari teka-teki sosiologis mengenai respons terbelah pedagang kaki lima Malioboro terhadap kebijakan relokasi. Menggunakan pendekatan kualitatif dengan kerangka teori Pierre Bourdieu, penelitian ini menganalisis benturan antara habitus kolektif pedagang dengan perubahan field spasial yang dipaksakan. Hasil penelitian menunjukkan bahwa perbedaan sikap ini berakar pada tingkat hysteresis atau ketidaksesuaian antara kebiasaan lama dan kondisi baru, yang dialami secara tidak setara. Kelompok Tri Dharma mengalami hysteresis parah akibat kondisi relokasi yang tidak stabil sehingga memicu resistensi, sementara kelompok Pemalni menunjukkan adaptasi lebih baik di lokasi yang permanen. Penelitian ini menegaskan bahwa relokasi adalah peristiwa sosial-politik yang kompleks, dan menggarisbawahi pentingnya kebijakan tata ruang untuk mempertimbangkan habitus komunitas terdampak demi mencegah terciptanya ketimpangan baru. This study begins with a sociological puzzle regarding the divided responses of street vendors in Malioboro toward the relocation policy. Employing a qualitative approach and Pierre Bourdieu’s theoretical framework, it analyzes the clash between the vendors’ collective habitus and the enforced changes in spatial fields. The findings indicate that these differing attitudes are rooted in varying levels of hysteresis, or misalignment between long-standing practices and new conditions, experienced unequally among the groups. The Tri Dharma group suffers severe hysteresis due to unstable relocation conditions, leading to resistance, while the Pemalni group shows better adaptation in a more permanent location. This research asserts that relocation is a complex socio-political event and highlights the importance of spatial policies that consider the habitus of affected communities to prevent the emergence of new inequalities.