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한슬기,김명주 서울여자대학교 컴퓨터과학연구소 2016 정보기술논문지 Vol.14 No.-
IT 산업을 이끌어갈 차세 기술로 가 주목받고 있다 는 홈네트워크 헬스어 제조 공공안 의 료 등 다양한 분야에서 사용되고 있다 는 기본으로 소형화 고성능력화 가격화 그리고 표화를 목표로 개 발된다 특히 자원의 제약이 있는 배터리 하드웨어와 같은 작은 디바이스들은 에지 효율성을 특히 요시한다 이 때 문에 각 제조사들은 소형화 력화된 제품을 생산해 내는 것에 주력하고 있는 상황이므로 상으로 보안이 취약 하다는 문제이 동시에 존재한다 본 논문에서는 디바이스들 에서도 배터리를 소모하여 동작하는 소형 디바이스에 서 사용되는 기술 취약에 해 반으로 살펴보고 소형 기기들의 보안취약 사례를 분석함으로써 소형 디바이 스들의 보안의 필요성과 요성을 제시한다
Practical Direction of Arrival Estimator using Constrained Robust Kalman Filtering
Seul-Ki Han,Won-Sang Ra,Jin Bae Park 제어로봇시스템학회 2013 제어로봇시스템학회 국제학술대회 논문집 Vol.2013 No.10
This paper proposes a linear estimation theory based direction of arrival (DOA) estimator to guarantee highperformance and computational efficiency. To do this, state-space system is derived from the linear prediction relation of the sinusoidal acoustic signal. Since it contains uncertain measurement matrix, the recently developed non-conservative robust Kalman filter (NCRKF) can be applied to compensate the performance degradation by the uncertain measurement matrix. However, unfortunately, the statistical information used in NCRKF scheme may not be precise in actual situation and it leads to the performance degradation. Therefore, in this paper, constrained NCRKF (CNCRKF) is presented to develop practical DOA estimator. It adopts constraint condition derived from the relation between target states to solve the performance degradation problem by the incorrect statistical information. The performance of the proposed solution is demonstrated by the computer simulation.
Study on an Electrode Attachment Method Suitable for Underwater Electromyography Measurements
( Seul Ki Han ),( Jung Seo Park ),( Taek Gil Nam ) 대한물리의학회 2015 대한물리의학회지 Vol.10 No.2
PURPOSE: This study was conducted to devise a method of preventing water infiltration into the surface electrodes during EMG measurements underwater and on the ground and to check the reliability of Electromyography (EMG) measurements when underwater. METHODS: Six healthy adults were selected as subjects in this study. The measurements in this study were conducted in pool dedicated to underwater exercise and physical therapy room in the hospital building. An MP150 (Biopac Systems, US, 2010) and a BioNomadix 2-channel wireless EMG transmitter (Biopac Systems, US, 2012) was used to examine the muscle activity of rectus femoris, biceps femoris, tibialis anterior, gastrocnemius of dominant side. The subjects repeated circulation tasks on the ground for more than 10 min for enough surface electrode attachment movement. After a 15-min break, subjects performed the circulation task underwater(water depth 1.1m, water temperature 33.5°C, air temperature 27°C), as on the ground, for more than 10 min, and the MVIC of each muscle was measured again. SPSS v20.0 was used for all statistical computations. RESULTS: The maximum voluntary isometric contraction (MVIC) values between the underwater and on the ground measurements showed no significant differences in all four muscles and showed a high intraclass correlation coefficient (ICC) of >0.80. CONCLUSION: We determined that EMG measurements obtained underwater could be used with high reliability, comparable to ground measurements.
Reliability Test of Smartphone-based Leg-Joint Position-Sense Measurement in People of All Ages
Seul-Ki Han,Dae-Hee Lee,Hye-Joo Jeon 대한신경치료학회 2022 신경치료 Vol.26 No.1
Purpose This study investigated the reliability of a smartphonebased test of lower limb joint position sense. Methods The 69 selected subjects were all ages. Ankle, knee, and hip joint position sense were measured using the Sensor Kinetics Pro application on a Galaxy 8 smartphone. The subjects were requested to remember any angle and then to reproduce the angle after 10 seconds. The reliability of the smartphone application was confirmed using the testretest method. Results The results showed very high reliability for the ankle and knee joints (intraclass correlation [ICC]>0.75) and significantly high correlations (r>0.70, r>0.50, p<0.01). In contrast, hip joint flexion and extension showed low reliability (ICC<0.40) and no significant correlation (r<0.30, p>0.01), while hip joint adduction and abduction showed high reliability (ICC>0.60) and significantly high correlation (r>0.30, p<0.01). Conclusion The findings of the present study reveal that a smartphone can be a sufficiently useful device for measuring joint position sense.