• IEMEK Journal of Embedded Systems and Applications
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• v.3 no.3
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• pp.136-142
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• 2008

Mobile robots can offer services like intelligent monitoring in an indoor environment using network connection with remote users. In this paper, we designed and developed a networked security robot system with various sensors, such as flame detector, gas detector, sound monitoring module, and temperature sensor, etc. The robot can be accessed through a web service and the user can check the status of the environment. Using ADAMS software, we defined the motor specification for a worst-case condition of climbing over a obstacle. We applied the robot system in monitoring office condition.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2008.10a
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• pp.720-723
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• 2008

RUPI-based robot service provides a variety of robot services guaranteeing extensibility and flexibility by communications between heterogeneous robots and servers. Unlike rich-client robot of high H/W performance and computing ability, as thin-client robot supports limited capability, it has some difficulty in performing security algorithms requiring relatively high computation power. Therefore, in this paper, we propose security framework of thin-client robot containing security threats, security requirements, and security functions.

• Proceedings of the KIEE Conference
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• 2002.11c
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• pp.495-500
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• 2002

Recently, a service robot industry outstands as an up and coming industry of the next generation. Specially, there are so many research in self-steering movement(SSM). In order to implement SSM, robot must effectively recognize all around, detect objects and make a surrounding map with sensors. So, many robots have a sonar and a infrared sensor, etc. But, in these sensors, We only know informations about between the robot and the object as well as resolution faculty is of inferior quality. In this paper, we will introduce new algorithm that recognizes objects around robot and makes a two dimension surrounding map with a omni-direction vision camera and two stereo vision cameras.

• The Journal of Korea Robotics Society
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• v.4 no.3
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• pp.169-176
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• 2009

Low-cost sensors have been widely used for mobile robot navigation in recent years. However, navigation performance based on low-cost sensors is not good enough to be practically used. Among many navigation techniques, building of an accurate map is a fundamental task for service robots, and mapping with low-cost IR sensors was investigated in this research. The robot's orientation uncertainty was considered for mapping by modifying the Bayesian update formula. Then, the data association scheme was investigated to improve the quality of a built map when the robot's pose uncertainty was large. Six low-cost IR sensors mounted on the robot could not give rich data enough to align the range data by the scan matching method, so a new sample-based method was proposed for data association. The real experiments indicated that the mapping method proposed in this research was able to generate a useful map for navigation.

• The Journal of Korea Robotics Society
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• v.3 no.2
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• pp.131-136
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• 2008

This paper proposes a method to extract the personal information using a microphone array. Useful personal information, particularly customers, is age and gender. On the basis of this information, service applications for robots can satisfy users by offering services adaptive to the special needs of specific user groups that may include adults and children as well as females and males. We applied Gaussian Mixture Model (GMM) as a classifier and Mel Frequency Cepstral coefficients (MFCCs) as a voice feature. The major aim of this paper is to discover the voice source parameters of age and gender and to classify these two characteristics simultaneously. For the ubiquitous environment, voices obtained by the selected channels in a microphone array are useful to reduce background noise.

• Proceedings of the Korean Information Science Society Conference
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• 2011.06c
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• pp.335-338
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• 2011

지능형 서비스 로봇은 일상의 환경 내에서 사용자에게 지속적으로 유용한 서비스를 제공해야 한다. 그러나 로봇 환경은 매우 복잡하고 역동적으로 변화하고 로봇의 크기나 비용, 기술의 한계 등으로 인해 로봇 작업의 실패나 오류와 같은 예외 상황이 발생할 수 있다. 본 논문에서는 이러한 예외 상황을 효과적으로 극복하기 위한 지능형 서비스 로봇 시스템 개발 방법론을 제시한다. 이 방법론은 프레임워크 형태로 정의되며 예외 모델과 대응 계획, 예외 극복 방법으로 구성된다. 예외 모델은 계층 구조로 정의하여 다양한 예외 상황을 일반화시키고, 대응 계획은 신속한 상황 대처를 가능하게 한다. 예외 모델과 대응계획이 극복 방법에 독립적으로 정의되어 로봇 지식으로 활용되므로 운용 중에 지속적인 추가 및 유지보수가 용이하다.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.29 no.11 s.242
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• pp.1534-1541
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• 2005

Unlike industrial manipulators, the manipulators mounted on service robots are interacting with humans in various aspects. Therefore, safety has been one of the most important design issues. Many compliant robot arms have been introduced for safety. It is known that passive compliance method has faster response and higher reliability than active ones. In this paper, a new safety mechanism based on passive compliance is proposed. Passive mechanical elements, specifically transmission angle of the 4-bar linkage, springs and shock absorbing modules are incorporated into this safety mechanism. This mechanism works only when the robot arm exerts contact force much more than the human pain tolerance. Validity of this mechanism is verified by simulations and experiments. It is shown that the manipulator using this mechanism provides higher performance and safety than those using other passive compliance mechanisms or active methods.

• Proceedings of the IEEK Conference
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• 2006.06a
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• pp.929-930
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• 2006

In this paper, we propose a planning algorithm which automatically generates robust behavior plans for service robots in the dynamically changing environments. The proposed method searches for paths to perform the given tasks in the physical space and the configuration space where tasks are described. And then, the characteristics of paths for successfully performed task are abstracted and generalized to build an ordered-tree structure. The resulting robust behavior plans guarantee that the given tasks are successfully performed. The validity of our method is tested by simulation work for a pushing-box task.

• Electronics and Telecommunications Trends
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• v.22 no.2 s.104
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• pp.20-30
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• 2007

본 고에서는 지능형 서비스 로봇에 적용되고 있는 기존의 로봇 제어구조에 대한 기술동향을 살펴보고, 가정환경에서 로봇이 적절한 정보를 획득하고, 이를 환경 내의 다른 장치나 가전도구와 연동할 수 있도록 하기 위한 환경 구축 방안과 로봇 내부의 제어구조 및 다양한 서비스를 제공하기 위한 서버와의 통신 문제 등에 대하여 살펴본다. 로봇이 가정 내에서 다양한 서비스를 제공하기 위해서는 가정 환경과의 적절한 상호작용은 필수적이다. 이를 위해서는 가정의 다양한 기기들과의 적절한 정보 교환이 필요하고, 이러한 정보를 효율적으로 이용할 수 있는 환경의 구축이 필수적이다. 또한, 로봇 내부적으로도 다양한 서비스를 제공하기 위한 적절한 제어구조가 필요하며, 경우에 따라서는 로봇 외부의 서버와의 협업을 통한 질높은 서비스의 제공이 지능형 서비스 로봇의 성공에 필수적인 조건이라 할 수 있다. 본 고에서 제안된 로봇 제어구조는 2006년 10월부터 시작된 URC 로봇 시범사업에 적용되어 현재 시범운용중에 있다.

• Electronics and Telecommunications Trends
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• v.35 no.7
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• pp.23-35
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• 2020

In this paper, we introduce ETRI AI Strategy #3, "Leading Future Technologies of Network, Media, and Content." Its first goal is "to innovate AI service technology to overcome the current limitations of AI technologies." Artificial intelligence (AI) services, such as self-driving cars and robots, are combinations of computing, network, AI algorithms, and other technologies. To develop AI services, we need to develop different types of network, media coding, and content creation technologies. Moreover, AI technologies are adopted in ICT technologies. Self-planning and self-managing networks and automatic content creation technologies using AI are being developed. This paper introduces the two directions of ETRI's ICT technology development plan for AI: ICT for AI and ICT by AI. The area of ICT for AI has only recently begun to develop. ETRI, the ICT leader, hopes to have opportunities for leadership in the second wave of AI services.