@article{ijtech-1891,
				title={A simple Hierarchical Activity Recognition System Using a Gravity Sensor and Accelerometer on a Smartphone},
				author={Alvin Prayuda Juniarta  Dwiyantoro,I Gde Dharma  Nugraha,Deokjai  Choi},
				volume={7},
				number={5},
				year={2016},
				month={Jul},
				pages={831-839},
				DOI={http://dx.doi.org/10.14716/ijtech.v7i5.3460},
				journal={International Journal of Technology},
				ISSN={2087-2100}}