• ETRI Journal
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• 제35권2호
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• pp.356-359
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• 2013

We present a method for tracking and interaction based on hybrid sensing for virtual environments. The proposed method is applied to motion tracking of whole areas, including the user's occlusion space, for a high-precision interaction. For real-time motion tracking surrounding a user, we estimate each joint position in the human body using a combination of a depth sensor and a wand-type physical user interface, which is necessary to convert gyroscope and acceleration values into positional data. Additionally, we construct virtual contents and evaluate the validity of results related to hybrid sensing-based whole-body tracking of human motion methods used to compensate for the occluded areas.

• Coupled systems mechanics
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• 제5권2호
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• pp.191-201
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• 2016

Coupled structures are widely seen in civil and mechanical engineering. In coupled structures, monitoring the translational motion of its key components is of great importance. For instance, some coupled arms are equipped with a hydraulic piston to provide the stiffness along the piston axial direction. The piston moves back and forth and a distance sensing system is necessary to make sure that the piston is within its stroke limit. The measured motion data also give us insight into how the coupled structure works and provides information for the design optimization. This paper develops two distance sensing systems for coupled structures. The first system measures distance with ultrasonic sensor. It consists of an ultrasonic sensing module, an Arduino interface board and a control computer. The system is then further upgraded to a three-sensor version, which can measure three different sets of distance data at the same time. The three modules are synchronized by the Arduino interface board as well as the self-developed software. Each ultrasonic sensor transmits high frequency ultrasonic waves from its transmitting unit and evaluates the echo received back by the receiving unit. From the measured time interval between sending the signal and receiving the echo, the distance to an object is determined. The second distance sensing system consists of a wire draw encoder, a data collection board and the control computer. Wire draw encoder is an electromechanical device to monitor linear motion by converting a central shaft rotation into electronic pulses of the encoder. Encoder can measure displacement, velocity and acceleration simultaneously and send the measured data to the control computer via the data acquisition board. From experimental results, it is concluded that both the ultrasonic and the wire draw encoder systems can obtain the linear motion of structures in real-time.

• 한국정밀공학회지
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• 제30권8호
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• pp.870-877
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• 2013

There has been much recent research interest in developing numerous kinds of human-machine interface. This field currently requires more accurate and reliable sensing systems to detect the intended human motion. Most conventional human-machine interface use electromyography (EMG) sensors to detect the intended motion. However, EMG sensors have a number of disadvantages and, as a consequence, the human-machine interface is difficult to use. This study describes a muscle volume sensor (MVS) that has been developed to measure variation in the outline of a muscle, for use as a human-machine interface. We developed an algorithm to calibrate the system, and the feasibility of using MVS for detecting muscular activity was demonstrated experimentally. We evaluated the performance of the MVS via isotonic contraction using the KIN-COM$^{(R)}$ equipment at torques of 5, 10, and 15 Nm.

• 한국전자거래학회지
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• 제21권2호
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• pp.97-119
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• 2016

가상현실 상황에서 모션인식 사용자 인터페이스는 사용자 경험의 현실감을 향상시킨다. 본 연구는 모션인식 인터페이스로 활용되는 제품인 '립모션'에 대한 잠재고객들의 혁신저항 및 수용 메커니즘을 지각된 위험 이론을 기반으로 연구하였다. 기존 혁신저항 및 제품 수용에 관련된 연구들은 지각된 위험의 결과 또는 지각된 가치가 수용의도에 미치는 영향을 단면적으로 다루어 왔다. 본 연구는 수용과 저항의 다차원적 관점을 기반으로 선행연구를 종합적으로 검토하여 지각된 위험 및 가치에 영향을 미치는 선행요인들을 제시하고 지각된 위험과 가치가 혁신저항에 미치는 복합적인 역학관계를 다루고자 하였다. 분석 결과, 기존의 수용 관점 모형에 포함되었던 선행요인들이 지각된 위험을 감소시킬 수 있고, 지각된 가치가 높으면 혁신저항이 감소한다는 점을 발견하였다.

• 디지털콘텐츠학회 논문지
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• 제15권4호
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• pp.473-480
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• 2014

오늘날 컴퓨터의 사용이 대중화 되면서 키보드나 마우스와 같은 기존의 사용자 인터페이스에 비해 보다 편리하고 자연스러운 인터페이스에 대한 연구가 활발히 진행되면서, 최근 마이크로소프트의 동작 인식 모듈인 키넥트에 대한 관심이 높아지고 있다. 키넥트는 내장된 센서를 통해 신체의 주요 관절의 움직임 및 깊이 정보를 인식할 수 있으며 내장 마이크를 통해 간단한 음성인식도 가능하다. 본 논문에서는 OpenCV 라이브러리를 키넥트에 접목하여, 키넥트의 깊이 데이터, skeleton tracking, labeling 알고리즘으로 손 영역 추출 및 움직임의 정보를 인식하여 가상 마우스와 가상 키보드를 구현하고, 음성인식을 통해 기존 입력 장치의 기능을 구현하는 것을 목표로 한다.

• 한국HCI학회논문지
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• 제3권1호
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• pp.1-7
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• 2008

최근 센싱 인터페이스의 소형화 및 경량화, 휴대형 컴퓨팅 자원의 성능 증가, 근거리 무선 통신 기술의 발전과 함께 휴대할 수 있는 생체신호 측정 인터페이스의 개발이 활발하게 이루어지고 있다. 그러나 기존의 생체신호 측정 장치는 다채널 센싱, 무선 통신을 지원하는 방법의 개발에 초점이 맞추어져 있었다. 본 논문에서는 미래형 홈 환경에서 일상적으로 사용자의 생체신호를 획득하기에 용이한 돌 형태의 휴대형 생체신호 측정 인터페이스를 제안하고 경험적인 평가 방법으로 분석한다. 제안한 돌 센싱 인터페이스는 센싱하는 동안 사용자에게 심미감과 편안함을 주는 동시에 센싱의 안정성 및 신뢰성을 보장하여 실용적으로 사용할 수 있도록 한다. 심미감과 센싱 편안함을 만족하기 위해 사용자 중심의 디자인 기법을 적용하여 반복적으로 사용성 테스트를 진행하고 구조를 구체화 하였다. 또한, 안정적으로 센싱을 하기 위해 실험을 통해 움직임과 잡음에 최소한의 영향을 받는 센싱 위치를 선정하고 이를 센싱 인터페이스에 적용하였다. 향후 제안된 생체신호 측정 인터페이스는 미래형 홈 환경에서 다양한 건강관리 모니터링 시스템에 유용하게 사용될 수 있다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 제39회 하계학술대회
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• pp.1735-1736
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• 2008

In this research, a riding robot system named as "RideBot" is developed for health-care and entertainments. The developed riding robot can follow the intention of horseman and can simulate the motion of horse. The riding robot mechanisms are used for many functions of attitude detection, motion sensing, recognition, common interface and motion-generations. This riding robot can react on health conditions, bio-signals and intention informations of user. One of the objectives of this research is that the riding robot could catch user motion and operate spontaneous movements. In this paper, we develope the saddle mechanism which can generate 3 degrees-of-freedom riding motion based on the intention of horseman. Also, we develope reins and spur mechanism for the recognition of the horseman's intention estimation and the bio-signal monitoring system for the health care function of a horseman. In order to evaluate the performance of the riding robot system, we tested several riding motions including slow and normal step motion, left and right turn motion.

• 한국멀티미디어학회논문지
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• 제17권12호
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• pp.1437-1445
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• 2014

A smartphone has very limited input methods regardless of its various functions. In this respect, it is one alternative that sensor motion recognition can make intuitive and various user interface. In this paper, we recognize user's motion using acceleration sensor, magnetic field sensor, and gyro sensor in smartphone. We try to reduce sensing error by gradient descent algorithm because in single sensor it is hard to obtain correct data. And we apply vector quantization by conversion of rotation displacement to spherical coordinate system for elevated recognition rate and recognition of small motion. After vector quantization process, we recognize motion using HMM(Hidden Markov Model).

• International Journal of Fuzzy Logic and Intelligent Systems
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• 제6권4호
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• pp.304-313
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• 2006

This paper describes a novel way of applying capacitive sensing technology to a mobile user interface. The key idea is to use grip-pattern, which is naturally produced when a user tries to use the mobile device, as a clue to determine an application to be launched. To this end, a capacitive touch sensing system is carefully designed and installed underneath the housing of the mobile device to capture the information of the user's grip-pattern. The captured data is then recognized by dedicated recognition algorithms. The feasibility of the proposed user interface system is thoroughly evaluated with various recognition tests.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1996년도 한국자동제어학술회의논문집(국내학술편); 포항공과대학교, 포항; 24-26 Oct. 1996
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• pp.636-639
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• 1996

We have developed a part of hydraulic stroke sensing cylinder using magnetic sensor that can detect each position under severe construction fields. In this paper, for evaluating the developed cylinder under various environment condition, thermal control systems and two hydraulic systems to be coupled consist of. The former is composed of an heater case, temperature sensor, and interface circuits which include SCR(silicon controlled rectifier) for the control of the voltage's phase. The latter is composed of an hydraulic cylinder for position control with solenoid valve (ON/OFF motion) and a load cylinder with proportional reducing valve. To obtain the various performance evaluation, it is carried out under high temperature condition in thermal system controlled by using Ziegler-Nichols PID tuning method and artificial disturbances such as impulse or constant force. The results show that the developed cylinder has good performance under the various environment condition.