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Improvement of Dynamic Respiration Monitoring Through Sensor Fusion of Accelerometer and Gyro-sensor
윤자웅,노연식,권이석,김원기,윤형로 대한전기학회 2014 Journal of Electrical Engineering & Technology Vol.9 No.1
In this paper, we suggest a method to improve the fusion of an accelerometer and gyro sensor by using a Kalman filter to produce a more high-quality respiration signal to supplement the weakness of using a single accelerometer. To evaluate our proposed algorithm’s performance, we developed a chest belt-type module. We performed experiments consisting of aerobic exercise and muscular exercises with 10 subjects. We compared the derived respiration signal from the accelerometer with that from our algorithm using the standard respiration signal from the piezoelectric sensor in the time and frequency domains during the aerobic and muscular exercises. We also analyzed the time delay to verify the synchronization between the output and standard signals. We confirmed that our algorithm improved the respiratory rate’s detection accuracy by 4.6% and 9.54% for the treadmill and leg press, respectively, which are dynamic. We also confirmed a small time delay of about 0.638 s on average. We determined that real-time monitoring of the respiration signal is possible. In conclusion, our suggested algorithm can acquire a more high-quality respiration signal in a dynamic exercise environment away from a limited static environment to provide safer and more effective exercises and improve exercise sustainability.
윤광식(Kwang Sik Yoon),한국헌(Kuk Heon Han),최진규(Jin Kyu Choi),구자웅(Ja Woong Koo),손재권(Jae Gwon Son),조재영(Jae Young Cho),조진구(Jin Goo Cho) 한국농촌계획학회 2002 농촌계획 Vol.8 No.1
A study was carried out to investigate the losses of sediment at a paddy plot located at the southern Korea. The observed amount of precipitation, irrigation, runoff for the experimental paddy plot during the cropping period were 1,030, 566, and 701 mm in 1999 and 1,214, 413, and 710 mm in 2000, respectively. The observed sediment losses from the plot during cropping period were 1,221.3 kg ha^-1 in 1999 and 1,274 kg/ha kg ha^-1 in 2000, respectively.
구자웅 ( Koo Ja Woong ),최진규 ( Choi Jin Kyu ),손재권 ( Son Jae Gwon ),윤광식 ( Yoon Kwang Sik ),이동욱 ( Lee Dong Wook ),조경훈 ( Cho Kyong Hun ) 한국농공학회 2001 韓國農工學會誌 : 전원과 자원 Vol.43 No.4
This study was performed in order to produce the basic data for developing prediction techniques of desalinization to be applicable to reclaimed tidal lands at the beginning stage. The desalinization experiments were carried out by two water management practices, namely, the leaching method by subsurface drainage and the rinsing method by surface drainage. The 5 soil samples used in this study were collected in 4 tidal land reclamation projects. Regression equations were obtained in order to investigate the changes of electrical conductivity during the desalinization of reclaimed tidal lands and to estimate water requirements for desalinization. The results obtained from this study were summarized as follows: 1. According to USDA Salinity Laboratory classification system of salt affected soils the reclaimed tidal land soils used in this study were saline-sodic soils with the high electrical conductivity and the high exchangeable sodium percentage. 2. With the increase of the water requirements for desalinization the electrical conductivity was decreased with high degree of correlationships and the desalinization effects were remakable in both the leaching method and the rinsing method. 3. In case of the leaching method the electrical conductivity had been reduced below the classification value of salt affected soils when the depth of water leached per unit depth of soil (Dwl/Ds) was 0.3 and the desalinization effects showed a tendency to be much the same in each treatment. 4. In the model experiments by the rinsing method, the electrical conductivity had been reduced below the classification value of salt affected soils when the depth of water applied per unit depth of soil (Dwa/Ds) was 3.0 in both permeable soils and impermeable soils. In the lysimeter experiments by the rinsing method, it was estimated that the electrical conductivity could be reduced below the classification value of salt affected soils when Dwa/Ds would be 3.5 in permeable soils and 4.5 in impermeable soils. 5. The leaching method has the merits of saving water requirements for desalinization and the convenience of desalinization works in permeable soils, but the demerit of a long period for desalinization. Also desalinization works would be next to impossible in impermeable soils through the leaching method. On the other hand, the rinsing method has the adventage of a short period for desalinization regardless of permeability, but the desalinization of subsoil would be difficult and the water requirements for desalinization would require 10 times more than those of the leaching method.
논에서의 강우 유출시 질소$\cdot$인의 초기농도와 유출과정 평균농도 비교
윤광식,최진규,조재영,손재권,구자웅,Yoon Kwang-sik,Choi Jin-kyu,Cho Jae-young,Son Jae-gwon,Koo Ja-woong 한국관개배수위원회 2000 한국관개배수논문집 Vol.7 No.1
To investigate the difference between initial and mean concentrations of nitrogen and phosphorus in runoff from a paddy field, water quality samples were taken for every two hours when runoff occurred by rainfall. The arithmetic mean concentration and wei
윤광식 ( Yoon Kwang Sik ),최진규 ( Choi Jin Kyu ),구자웅 ( Goo Ja Woong ),손재권 ( Son Jae Gwon ),조재영 ( Cho Jae Young ) 한국농공학회 2001 한국농공학회 학술대회초록집 Vol.2001 No.-
Runoff, sediments and nutrient losses were studied under different patterns of paddy field management: (1) fall and spring plowing (PL); (2) fall plowing for half of plot and spring plowing (SPL); (3) no-till for fall and spring plowing (NPL) during the non-cropping period in the southern Korea. Sediment losses from PL plot were 25% more than those from NPL plot. There was significant difference in nutrient losses via runoff water and sediment according to plowing practice (P < 0.01) Losses of total-N, ammonia-N, nitrate-N, total-P from NPL plot were larger than PL and SPL plots during study period. Sediment and total-P losses from SPL plot were close to those of PL plot.
전수영,구자웅,홍승필,오탁헌,윤화식,이원수 연세대학교의과대학 2008 Yonsei medical journal Vol.49 No.2
Various methods have been used to investigate the hair shaft. In the ultrastructural hair field, scanning and transmission electron microscopies are widely used investigative methods, but they have some technical limitations. Recently, X-ray microscopes with sub-micron spatial resolution have emerged as useful instruments because they offer a unique opportunity to observe the interior of an undamaged sample in greater detail. In this report, we examined damaged hair shaft tips using hard X-ray microscopy with a 90 nm spatial resolution. The results of this study suggest that hard X-ray microscopy is an alternative investigative method for hair morphology studies.