• Journal of the Korean Society for Aeronautical & Space Sciences
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• 제45권5호
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• pp.417-428
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• 2017

In this paper, we describe the architectural design, unit component hardware design and core software design(Helmet Pose Tracking Software and Terrain Elevation Data Correction Software) of IHDS(Intelligent Helmet Display System), and describe the results of unit test and integration test. According to the trend of the latest helmet display system, the specifications which includes 3D map display, FLIR(Forward Looking Infra-Red) display, hybrid helmet pose tracking, visor reflection type of binocular optical system, NVC(Night Vision Camera) display, lightweight composite helmet shell were applied to the design. Especially, we proposed unique design concepts such as the automatic correction of altitude error of 3D map data, high precision image registration, multi-color lighting optical system, transmissive image emitting surface using diffraction optical element, tracking camera minimizing latency time of helmet pose estimation and air pockets for helmet fixation on head. After completing the prototype of all system components, unit tests and system integration tests were performed to verify the functions and performance.

• Journal of Astronomy and Space Sciences
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• 제19권4호
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• pp.351-366
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• 2002

In this study, we developed low cost INS and (D)GPS integration for continuous attitude and position and utilized it for the determination of exterior orientation parameters of image sensors which are equipped in 4S-Van. During initial alignment process, the heading information was extracted from twin GPS and fine alignment with Kalman filter was performed for the determination of roll and pitch. Simulation and van test were performed for the performance analysis. Based on simulation result, roll and pitch error is around 0.01-0.03 degrees and yaw error around 0.1 degrees. Based on van test, position error in linear road is around 10 cm and curve around 1 m. Using direct georeferencing method, the image sensor's orientation and position information can be acquired directly from (D)GPS/INS integration. 4S-Van achieved 3D spatial data using (D)GPS/INS and image data can be applied to the spatial data integration and application such as contemporary digital map update, road facility management and Video GIS DB.

• The Journal of the Korea institute of electronic communication sciences
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• 제19권3호
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• pp.583-588
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• 2024

With the emergence of Brain-Computer Interface (BCI) technology, analyzing mirror neurons has become more feasible. However, evaluating the accuracy of BCI systems that rely on human thoughts poses challenges due to their qualitative nature. To harness the potential of BCI, we propose a new approach to measure accuracy based on the characteristics of mirror neurons in the human brain that are influenced by speech speed, depending on the ultimate goal of movement. In Chapter 2 of this paper, we introduce mirror neurons and provide an explanation of human posture estimation for mirror neurons. In Chapter 3, we present a powerful pose estimation method suitable for real-time dynamic environments using the technique of human posture estimation. Furthermore, we propose a method to analyze the accuracy of BCI using this robotic environment.

• Transactions of the Korean Society of Automotive Engineers
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• 제11권6호
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• pp.108-117
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• 2003

Development of advanced restraint system challenges both restraint and automobile manufacturers to come up with proper airbag design to reduce occupant out-of-position related injury. The important component of the advanced restraint system is the multi stage inflator. The multi stage inflator can independently control two or more airbag inflation stages to maximize occupant protection. The objective of this research is to develop relationship between airbag inflation characteristics, the occupant positions and the airbag design variables. The tests are conducted using five kinds of inflators, two kinds of airbag cushion folding methods and two kinds of tear lines. In the case of inflator, the out-of-position tests are performed with a traditional inflator, a depowered inflator and a dual stage inflator. And the efficiency and injury mechanism are evaluated by analyzing the injury pulses and values. Using this relationship, airbag design guideline is established for airbag aggressivity thresholds and the risk of injury is identified according to occupant positions.

• Proceedings of the Korean Institute of Industrial Safety Conference
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• 한국안전학회 2000년도 추계 학술논문발표회 논문집
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• pp.478-481
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• 2000

그 동안 정부, 기업, 산업안전인의 노력으로 통계 상 국내의 산업재해 발생건수가 1991년 이후 크게 줄어들고 있는 것이 사실이다. 그러나 최근 들어 불편한 작업자세로 오랜 기간동안 작업할 때 나타날 수 있는 누적외상병 (CTD; Cumulative Trauma Disorder)에 대한 보고와 자각 증세를 호소하는 노동자들은 점차 늘고 있다. 특히 불편한 작업 자세로 장시간 중량물을 취급할 경우 요통재해로 발전할 가능성은 매우 높다. 정민근 등(1997)의 조사는 1992년부터 1994 년까지 포항 지역의 재해자 중 781 명 약 13.4 %가 요통재해자라는 것을 밝힌 적인 있는데, 이 사실만으로도 그 심각성을 쉽게 알 수 있다. 특히 요통재해의 원인 중 들기 작업이 26.9%로 가장 큰 비중을 차지하는 것으로 보고하고 있다.(중략)

• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 한국감성과학회 2007년도 춘계학술대회 및 국제감성 심포지엄
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• pp.42-44
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• 2007

본 연구에서는 체성분 측정용 스마트 의류의 프로토타입을 개발하고 평가함으로써 헬스케어 의류로써의 개발 가능성을 탐색하고자 하였다. 직물 전극을 사용하여 두 가지 타입으로 개발된 실험의복을 피험자에게 착용하도록 한 후 자세의 변화 및 1차 착용, 탈의 후 2차 착용에 따른 체성분을 측정한 결과, 동일 자세 내에서는 의복 타입 및 1, 2차 반복 착용에 관계없이 비교적 일관성 있는 임피던스 측정치를 얻을 수 있었으며, 착용자의 신체 부위별 측정도 가능한 것으로 분석되었다.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 한국추진공학회 2009년도 제33회 추계학술대회논문집
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• pp.19-22
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• 2009

Design and performance evaluation of $H_2O_2$ monopropellant thrusters to be used at attitude control of space launch vehicles were presented in this paper. Flight model thrusters were designed after two reactors for 100, 250 Newton were conformed at engineering model. Each thruster was evaluated by measurement of characteristic velocity, thrust, specific impulse, and pulse response times.

• The Journal of Korean Institute of Communications and Information Sciences
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• 제18권10호
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• pp.1444-1453
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• 1993

비 구조적인 주면 환경에서 평면 팔레트(planar pallet)를 포크리프트(forklift)로 적재하거나 하역하기 위한 물류용 재료운송 로보트 시스템을 제안한다. 제안한 시스템은 음향(acoustic)센서와 시각(visual) 센싱데이타를 사용하여 팔레트에 지정된 2개의 스롯(slot)의 위치를 결정하고 포크리프트를 팔레트의 스롯에 인게즈(engage) 한다. 본 연구에서는 재료운송 시스템의 복잡성을 줄이기 위해서 폴라로이드(Poraloid) 음향센서의 3차원 거리 데이터와 CCD 카메라에서 얻은 2차원 시각 네이타를 통합하는 방법을 개발한다. 2개의 다른 소스로부터 얻은 데이타는 서로의 미비점을 보안하며 재료운송 로보트 시스템을제어하기 위한 효율적인 알고리즘을 제공한다. 카메라는 far-away vision 개념에 의한 음향센서의 선형 스캔닝(scanning) 대역을 우선 결정한다. 선형 스캔닝에 의하여 얻어지는 거리 데이타(range Map)는 least mean square방법을 사용하여 팔레트의 위치와 자세(position and orientation)를 결정한다(near vision). 팔레트에 대한 위치와 자세가 결정되면 다시 시각센서를 이용하여(close vision) 에지(edge)탐지와 Hough transfrom 기술을 적용하여 팔레트에 대한 포크리프트의 인게이지먼트 위치를 구한다. 개발된 시스템은 하드웨어와 소프트웨어로 구현하고 평가하며 실험적인 결과도 제시한다.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 한국소음진동공학회 2004년도 춘계학술대회논문집
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• pp.105-108
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• 2004

This paper introduces a process of the development of a vibration test dummy for the posture of inclined seating. Experimental devices was invented to measure apparent mass curves on the contact point of the hip and the back of a seated human body. During the excitation of a rigid seat secured to a hydraulic exciter, force and acceleration signals were measured on the contact points to determine the apparent mass. In order to describe nonlinear characteristics of a human body, seven levels of Gaussian random signal were used for the base excitation. The modeling of the human body will be performed using measured apparent mass curves. The modeling will be done by June and the prototype of the test dummy will be invented in the following six months.

• Aerospace Engineering and Technology
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• 제6권2호
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• pp.1-7
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• 2007

The control design for attitude and yaw rate of 40 % scaled SMART UA Vhas been performed. Analytic selection method for a control gain is proposed to meet the design specification of desired time response considering stability margin. The sliding mode attitude controller is also proposed and compared with the simulation results of a linear controller. Additionally, a velocity and height tracking controller is devised to prepar for the flight test.