• 한국산업정보학회논문지
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• 제15권2호
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• pp.91-98
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• 2010

본 논문에서는 센서네트워크시스템에서 다양한 센서 정보를 협업시켜 주변 환경을 효율적으로 감시하는 모니터링 시스템을 제안한다. 제안한 모니터링 시스템은 카메라, 이동체 및 인체 감지센서를 설치하여 예외시간에 내부 공간으로 침입하는 침입자를 감지하기 위한 목적으로 구현이 되었다. 본 논문에서 제안한 시스템은 센위버 플랫폼 상에서 개발되었으며, 실험한 결과, 다중 센서 정보의 상호보완적 활용으로 보다 효율적인 환경을 감시가 가능함을 알 수 있었다. 또한 센위버 플랫폼의 사용으로 센서 네트워크 구성이 용이하며 다양한 센서의 추가적 설치 및 활용이 가능하다. 또한 영상정보의 분석으로 움직이는 객체에 대한 판별이 가능하게 되어 센서의 동작을 단계적으로 적용시키는 체계적인 모니터링시스템의 구현이 가능함을 보였다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2004년도 추계학술대회 논문집
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• pp.742-745
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• 2004

If a personal robot is popularized like a personal computer in the future, many kinds of robots will appear and the number of manufacturers will increase as a matter of course. In such circumstances, it can be inefficient, in case each manufacturer makes a whole platform individually. The solutions for this problem are to modularize a robot component (hardware and software) functionally and to standardize each module. Each module is developed and sold by each special maker and a consumer purchases desired modules and integrates them. The standardization of a module includes the unification of electrical and mechanical interface. In this paper, the standard interfaces of modules are proposed and CMR(Component Modularized Robot)-P2 made with the modules(brain, sensor, mobile, arm) is introduced. In order to simplify and to make the modules light, a frame is used for supporting a robot and communication/power lines. The name of a method and the way to use that are defined dependently on the standard interfaces in order to use a module in other modules. Each module consists of a distributed object and that can be implemented in the random language and platform. The sensor, mobile and arm modules are developed on Pentium or ARM CPU and embedded Linux OS using the C programming language. The brain module is developed on Pentium CPU and Windows OS using the C, C++ and RPL(Robot Programming Language). Also tasks like pass planning, localization, moving, object perception and face perception are developed. In our test, modules got into gear and CMR-P2 executed various scenarios like guidance, errand and guarding completely.

• 한국멀티미디어학회논문지
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• 제13권8호
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• pp.1235-1244
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• 2010

최근 아이폰을 필두로 급부상하는 스마트폰의 정전기식 입력 장치에서는 펜 입력장치나 감압식 입력 장치를 위해 만들어진 제스처기반 인터페이스가 적합하지 않다. 손가락 튕김 인터페이스는 기존의 제스처기반 인터페이스에서 사용했던 플릭 제스처와 달리 명령을 적용시킬 대상과 명령을 동시에 선택함으로 작업 단계를 절반으로 감소시킬 수 있다. 뿐만 아니라, 멀티터치 인터페이스와 병합하여 사용함으로 다양한 메뉴 지원이 가능하여 복잡한 제스처를 학습할 필요가 없고, 정전기식 입력 장치 장치에 사용하기 적합하여 입력 오류를 최소화 시킨다. 본 연구에서는 정전기식 입력 장치를 가지는 스마트 폰 장치에서의 파일 관리를 빠르게 해주는 다중 손가락 튕김 인터페이스를 설계하고 구현한다. 실험에서는 사용자 평가를 통해 제안하는 인터페이스가 정전기식 입력 장치에서 기존 방식보다 유용함을 증명한다.

• 한국컴퓨터그래픽스학회논문지
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• 제25권2호
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• pp.1-9
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• 2019

본 연구는 몰입형 가상현실에서의 상호작용 과정에서 사용자의 몰입을 높여 향상된 현존감을 제공하는 손 기반 인터페이스에 대한 비교 실험을 진행한다. 몰입형 가상현실에서 사용자에게 장비의 부담을 최소화하면서 동시에 손을 보다 직접적으로 사용하여 가상 환경과 객체를 제어할 수 있는 몰입형 체험 환경을 제공하기 위하여 손 동작 인식 센서 기반 상호작용과 컨트롤러 기반 상호작용의 두 가지 실험 인터페이스를 설계한다. 손 동작 인식 센서 기반 상호작용은 VR (virtual reality) HMD (head mounted display) 외에 추가적인 장비를 사용하는 대신 정확한 손의 움직임과 직접적인 제스쳐 및 동작 표현을 가상 환경에 반영한다. 컨트롤러 기반 상호작용은 VR HMD와 함께 제공되는 컨트롤러를 쉽게 활용할 수 있도록 손의 제스쳐와 컨트롤러의 키를 매핑시킨 일반화된 인터페이스를 설계한다. 이러한 과정을 통해 본 연구는 손을 활용한 가상현실에서의 상호작용이 사용자의 편리함과 직관성에 측면에서 현존감에 미치는 영향을 비교 실험을 통해 확인한다.

• 센서학회지
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• 제15권1호
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• pp.34-39
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• 2006

This study provides the electrical model of combustible catalytic gas sensor. Physical characteristics such as thermal behavior, resistance change were included in this model. The finite element method analysis for sensor device structure showed that the thermal behavior of sensor is expressed in a simple electrical equivalent circuit that consists of a resistor, a capacitor and a current source. This thermal equivalent circuit interfaces with real electrical circuit using two parts. One is 'power to heat' converter. The other is temperature dependent variable resistor. These parts realized with the analog behavior devices of the SPICE library. The gas response tendency was represented from the mass transferring limitation theory and the combustion theory. In this model, Gas concentration that is expressed in voltage at the model, is converted to heat and is flowed to the thermal equivalent circuit. This model is tested in several circuit simulations. The resistance change of device, the delay time due to thermal capacity, the gas responses output voltage that are calculated from SPICE simulations correspond well to real results from measuring in electrical circuits. Also good simulation result can be produced in the more complicated circuit that includes amplifier, bios circiut, buffer part.

• 인터넷정보학회논문지
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• 제12권2호
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• pp.29-36
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• 2011

본 논문에서는 스마트 폰에서 위치인식기반의 LBS서비스를 위해 GPS 수신모듈에서 NMEA(National Marine Electronics Association)의 문장을 분석하고, GPS 수신기에서 NMEA의 위치정보를 웹 서버로 전송하기 위한 파서를 설계한다. 또한, 구글지도(Google Map)의 API규격에 따라 GPS 수신기의 위치좌표 값을 XML파일로 변환하는 구글 지도용 API를 설계한다. 본 논문의 결과로 스마트폰의 GPS 수신기는 NMEA 문장과 구글 지도용 API의 연동방안과 웹 서버가 구글 지도용 좌표 값의 매핑(Mapping)을 통해 이동체의 위치와 GPS 수신기의 이동경로를 확인할 수 있는 실시간 위치정보 서비스가 가능한 센서 웹 서비스를 구현할 수 있다.

• Bulletin of the Korean Chemical Society
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• 제34권10호
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• pp.2973-2977
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• 2013

In this study, we developed a liquid crystal (LC)-based optical sensor for monitoring enzymatic activity through orientational changes in liquid crystals (LCs) coupled to the properties of a poly-${\small{L}}$-lysine (PLL)-based polymeric membrane. We prepared a PLL-based polymeric membrane at the planar interface between the thermotropic liquid crystal and aqueous phases. The PLL-based polymeric membrane was obtained by contacting the PLL solution with water immiscible LCs, 4-cyano-4'-pentyl-biphenyl (5CB) doped with adipoyl chloride. We then investigated the membrane properties by examining the permeability of the membrane to phospholipids, 1,2-didodecanoyl-rac-glycero-3-phosphocholine (DLPC). The permeability of the membrane to transport phospholipids was monitored through the orientational transition of 5CB in contact with the dispersions of DLPC. Since trypsin can enzymatically catalyze the hydrolysis of PLL, we incubated an aqueous trypsin solution with the membrane for 2 h at room temperature to cause an increase in the permeability of the polymeric membrane to DLPC. As a result, a bright to dark optical shift of LCs was observed, which implied that an enzymatic reaction between trypsin and PLL-based membrane occurred. Two control experiments using chymotrypsin and bovine serum albumin (BSA) revealed no sign of improved permeability based on the orientational transition of LCs.

• 전자통신동향분석
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• 제37권2호
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• pp.30-41
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• 2022

As the society is superaging, the number of patients with movement disabilities due to musculoskeletal or nervous system illness is rapidly increasing. To improve public health and reduce medical expenses, it is essential to develop rehabilitation systems that allow patients to resume their daily-life activities. However, the existing musculoskeletal illness diagnosis and rehabilitation method is limited in terms of precision and efficiency because it is based on an empirical diagnosis and prescription without regard for individual characteristics. To overcome these limits, it is critical to design a novel concept of routine rehabilitation therapy device that is capable of inducing musculoskeletal balance by the precise analysis of musculoskeletal usage patterns via the motion and the muscle activity tracking of linked muscles. This study introduces the trend of on-skin sensor device technology for routine musculoskeletal monitoring and therapy. For on-skin rehabilitation systems, skin-adhesive and stretchable motion/posture, electromyography, pressure sensors, small-size and low-power wireless sensor interfaces, and user-friendly rehabilitation contents based on new algorithms are combined.

• 센서학회지
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• 제14권2호
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• pp.69-77
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• 2005

The electronic nose (e-nose) has been used in food industry and quality controls in plastic packaging. Recently it finds its applications in medical diagnosis, specifically on detection of diabetes, pulmonary or gastrointestinal problem, or infections by examining odors in the breath or tissues with its odor characterizing ability. Moreover, the use of portable e-nose enables the on-site measurements and analysis of vapors without extra gas-sampling units. This is expected to widen the application of the e-nose in various fields including point-of-care-test or e-health. In this study, a PDA-based portable e-nose was developed using micro-machined gas sensor array and miniaturized electronic interfaces. The rich capacities of the PDA in its computing power and various interfaces are expected to provide the rapid and application specific development of the diagnostic devices, and easy connection to other facilities through information technology (IT) infra. For performance verification of the developed portable e-nose system, Six different vapors were measured using the system. Seven different carbon-black polymer composites were used for the sensor array. The results showed the reproducibility of the measured data and the distinguishable patterns between the vapor species. Additionally, the application of two typical pattern recognition algorithms verified the possibility of the automatic vapor recognition from the portable measurements. These validated the portable e-nose based on PDA developed in this study.

• Structural Engineering and Mechanics
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• 제34권4호
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• pp.449-474
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• 2010

A smart hollow cylinder consisting of a host functionally graded elastic core layer and two surface homogeneous piezoelectric layers is presented in this paper. The bonding between the layers can be perfect or imperfect, depending on the parameters taken in the general linear spring-layer interface model. The effect of such weak interfaces on free vibration and steady-state response is then investigated. Piezoelectric layers at inner and outer surfaces are polarized axially or radially and act as a sensor and an actuator respectively. For a simply supported condition, the state equations with non-constant coefficients are obtained directly from the formulations of elasticity/piezoelasticity. An approximate laminated model is then introduced for the sake of solving the state equations conveniently. It is further assumed that the hollow cylinder is embedded in an elastic medium and is simultaneously filled with compressible fluid. The interaction between the structure and its surrounding media is taken into account. Numerical examples are finally given with discussions on the effect of some related parameters.