• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2000년도 추계학술대회 논문집
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• pp.90-95
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• 2000

This paper presents the vergence control of a parallel stereo camera and its application to underwater stereo camera to enhance the working efficiency of underwater vehicles that equips with manipulators in seabed operation. The stereo camera consists of two parallel lenses mounted on a lateral moving base and two CCD cameras mounted on a longitudinal moving base, which is embedded in a small pressure canister for underwater application. Because the lateral shift is related to the backward shift with a nonlinear relation, only one control input is needed to control the vergence and focus of the camera with a special driving device. We can get a clear stereo vision with the camera for all the range of objects in air and in water, especially in short range objects. The control system of the camera is so simple that we are able to realize a small stereo camera system and to apply it to a stereo vision system for underwater vehicles. This paper also shows how to acquire the distance information of an underwater object with this stereo camera. Whenever we focus on an underwater object with the camera, we can obtain the three-dimensional images and the distance information in real-time.

• The Journal of Korean Physical Therapy
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• 제23권3호
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• pp.71-77
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• 2011

Purpose: In this study, we tried to determine the effect of upper extremity training such as functional reaching on improved trunk control and ADL performance in post-stroke hemiplegic patients. Methods: We randomly selected 11 stroke patients in the hospital, who had a problem with the upper extremity, trunk and ADL performance. The patients were divided into the conservative training group and the functional reaching training group. We applied general occupational therapy only in the conservative training group whereas we applied upper extremity training with a focus on functional reaching in the functional reaching training group. To compare the two groups we used several assessment tools such as Modified Barthel Index (MBI), total Trunk Impairment Scale (TIS), static TIS, dynamic TIS and coordinative TIS. Results: The results obtained were as follows: (1) In the functional reaching training group, there was a statistically significant difference in the total TIS score, dynamic TIS score, and MBI. (2) We compared the results obtained before training with the changes in the results obtained after training and found that there was a relation between the assessment outcomes. Especially, static TIS score showed a relation in both groups. Conclusion: Functional reaching training influenced both the trunk control and ADL performance. Especially, the functional reaching training group demonstrated better static trunk control ability than the conservative treatment group.

• 한국해양공학회지
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• 제15권1호
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• pp.79-84
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• 2001

This paper present the control of the image disparity of a parallel stereo camera and its application to an underwater stereo camera to enhance the working efficiency of underwater vehicles that are equiped with manipulators in seabed operation. The stereo camera consists of two parallel lenses mounted on a lateral moving base and two CCD cameras mounted on a longitudinal moving base, which is embedded in a small pressure canister for underwater application. Because the lateral shift is related to the backward shift with a nonlinear relation, only one control input is needed to control the vergence and focus of the camera with a special driving device. We can get clear stereo vision with the camera for all the range of objects in air and in water, especially in short range object. The control system of the camera is so simple that we are able to realize a small stereo camera system and apply it to a stereo vision system for underwater vehicles. This paper also shows how to acquire the distance information of an underwater object with this stereo camera. Whenever we focus on an underwater object with the camera, we can obtain three-dimensional images and distance information in real-time.

• 벤처혁신연구
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• 제6권4호
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• pp.83-97
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• 2023

라이브커머스 시장의 성장은 스마트폰만 있으면 언제, 어디서나, 편리하고 간단하게 라이브커머스를 시작할 수 있다. 스마트폰 서비스 이용은 지속적인 커뮤니케이션을 제공하며, 심리적 애착을 느끼면서 이용하게 되고, 더 나아가 심리적 애착과 소비자 자신과의 자아일치, 자아정체성까지 연결된다. 본 연구는 라이브커머스를 이용하는 소비자의 동기와 지각에 초점을 두고 살펴보고자 한다. 즉, 소비자의 개인적, 심리적 특성으로 조절초점성향과 자아효능감(self-efficacy)의 조절효과를 통해 서비스애착과의 관계를 살펴보려 한다. 다시 말해, 소비자의 동기와 목표에 따라 소비자의 행동 방향을 결정하게 되는 조절초점(regulatory focus)성향이 라이브커머스의 서비스애착에 영향을 미치고. 주어진 상황이나 과업에서 원하는 결과를 위해 스스로 계획하고 실행하여 목표를 달성할 수 있다는 개인적인 자신감 및 확신과 신념인 자아효능감(self-efficacy)이 이러한 관계를 조절할 것으로 본다. 분석결과, 예방초점을 높게 지각하는 소비자들은 부정적인 결과를 회피하고, 안전과 의무를 추구하는 경향이 강할수록, 개인적인 자신감과 신념인 자아효능감이 상쇄시켜 라이브커머스의 서비스에 대한 애착을 더 강하게 형성시켰다. 라이브커머스 서비스 이용 시, 정보획득에 대해 유익하다고 지각할수록, 자신의 신념인 자아효능감이 높아지므로 안전추구성향과 부정적 결과를 회피하려는 예방초점성향의 소비자들에게 인지적 경험뿐 아니라 감정적 경험인 서비스애착이 강하게 형성되는 것이다. 본 연구를 통해 라이브커머스의 서비스 이용에 대한 소비자의 심리적 행동을 이해하고, 이를 기반으로 라이브커머스에 진입하려는 기업 및 소상공인들에게 운영전략 및 관리에 도움이 되리라 본다.

• Physical Therapy Rehabilitation Science
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• 제8권3호
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• pp.158-161
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• 2019

Objective: Attentional focus is one of the critical factors that has consistently been demonstrated to enhance motor performance and motor skill. Focusing attention on the inside of the body while engaging in a particular exercise is called internal focus (IF) and focus on the external environment is called external focus (EF). The purpose of this study was to identify effects of IF and EF of attention on postural balance in healthy school-aged children. Design: Cross-sectional study. Methods: Twenty-four healthy school-aged children participated in this study. School-aged children was defined as children ages 8-12 years old. They performed the one-legged standing with EF (focusing on the marker at the level of participants' chest and 150 cm away), IF (focusing the supporting feet), and control (no instruction) respectively. The order of the focus condition was randomly selected. The center of pressure (COP) range, distance, and velocity was measured to compare the effects of applying different attentional focuses in the three conditions. Results: The results of our study show that differences in COP range, distance, and velocity among groups were not significant between the different attentional focuses, although all variables of EF were smaller than IF. It is postulated that the reason for this may be that school school-aged children between 8-12 years old go through a transitional phase from IF to EF in effective motor learning. Conclusions: These findings reveal that the type of attentional focus did not have any effect on postural balance in healthy school-aged children.

• 대한방사선기술학회지:방사선기술과학
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• 제36권2호
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• pp.111-122
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• 2013

본 연구는 디지털방사선장비에서 자동노출제어장치 사용 시 초점-검출기간의 거리, 관전압, 구리필터의 조합을 이용해 환자의 피폭을 감소하고자 시행 하였다. 경추, 요추측면검사, 두개골 전후검사법을 대상으로 관전 압은 60~100 kV, 초점-검출기간의 거리는 100~200 cm으로 변화시키고 구리필터를 추가하면서 입사선량을 측정하고 영상을 평가하였다. 입사선량은 경추측면검사에서 90 kV, 0.3 mmCu, 200 cm일 경우에 0.06 mGy, 요추측면검사에서는 100 kV, 0.3 mmCu, 200 cm일 경우 0.40 mGy, 두개골전후검사에서는 90 kV, 0.3 mmCu, 140 cm일 경우 0.24 mGy로 가장 낮았다. 입사선량은 0.1 mmCu, 150 cm, 70 kV (경추측면검사), 81 kV (요추측면검사)로 변화 시켰을 경우에 가장 큰 폭으로 감소했다. 초점-검출기간의 거리가 늘어날수록 영상의 확대가 줄었고 180 cm 이상에서는 차이가 적었다. 두개골전후검사에서는 80 kV, 0.1 mmCu, 120 cm으로 변화했을 경우에 입사선량이 가장 많이 감소했다. 따라서 자동노출제어장치를 사용할 시 영상의 품질을 고려한 범위에서 최대한 높은 관전압을 사용하고 초점-검출기간의 거리는 검사실의 구조, 방사선사의 신체조건을 감안하여 선 검사대(Wall)에서는 150~200 cm, 누운 검사대(Table)에서는 120~140 cm으로 늘리고 0.1~0.3 mm Cu의 부가필터를 적절히 조합하여 사용하는 것이 영상의 왜곡 방지와 입사선량을 감소시켜 환자의 피폭을 줄일 수 있을 것이다.

• 아동학회지
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• 제36권2호
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• pp.1-16
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• 2015

The purpose of this study is to investigate the effects of father's play beliefs on father-child interaction and child's social skills. The subjects were 370 fathers of 1, 2 and 3 graders of elementary schools who lived in Seoul and Gyeonggi area. The results were as follows; First, the differences were found to be significant between the whole of father's play hours, play focus beliefs, study focus beliefs and father-child interaction, and their sub-variables of disciplinary action, sensitiveness, and affectionate expression; and between the whole of child's social skills and its sub-variables of cooperative action, self-assertion and self-control. Second, the higher play focus beliefs, the more positive interaction on the child, and specifically they use much democratic disciplinary action, sensitiveness and affectionate expression. Third, as to the effect of the father's play focus beliefs on the child's social skills, father-child interaction was found to act as a partial parameter, while as to the effect of the father's study focus beliefs on the child's social skills, father-child interaction was found to act as a full parameter.

• 한국지능시스템학회논문지
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• 제23권6호
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• pp.527-532
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• 2013

깊이 추정은 로봇 비전, 3차원 영상, 모션 제어를 위해 사용되는 매우 중요한 인자이다. 깊이 추정은 렌즈와 물체 사이의 거리를 변화시켜가면서 취득된 일련의 영상에서 계산된 초점 정보에 기반을 둔다. 본 논문에서는 다양한 초점정보를 이용한 패턴간의 상대적 깊이 추정 알고리즘을 제안한다. 제안된 방법은 거리별로 취득된 영상의 초점값 정보를 이용하여 구현하였으며, 깊이는 두 패턴의 상대적 거리를 고려함으로써 추정하였다. 다양한 영상정보를 이용하여 깊이 추정을 수행한 결과 효과적인 추정이 가능함을 알 수 있었다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2002년도 ICCAS
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• pp.94.3-94
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• 2002

Modern distributed control systems focus on system openness, network system architecture and PC based controller. This paper discusses the embedded systems with ORB for distributed control systems. Embedded systems have merits such as small size, low cost and user convenience. ORB allows users to program easily by using IDL and provides client/server network for heterogeneous platforms. By using embedded systems and ORB, we implement the system and validate it by using VME system. The developed system has benefits when it is applied to distributed control systems.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1991년도 한국자동제어학술회의논문집(국내학술편); KOEX, Seoul; 22-24 Oct. 1991
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• pp.7-11
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• 1991

The adaptive control of flexible joint manipulator is the focus of this paper. The full order flexible joint manipulator dynamic system does not allow the determination of a feedback linearization control as for rigid manipulators. This drawback is overcome by a model order reduction based on a singular perturbation strategy. The full order flexible joint manipulator dynamic model is adopted for derivation of the adaptive control law to damp out the elastic oscillations at the joints. It is shown that the joint position error will converge to zero asymptotically and that other signals remain bounded without precise knowledge of parameters of the manipulator and its joint flexibility.