• Electronics and Telecommunications Trends
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• v.19 no.3 s.87
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• pp.32-40
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• 2004

상황정보(context information)는 사용자의 요구와 주변 상황이 수시로 변화하는 이동통신 환경에서 더욱 중요하게 활용된다. 따라서, 차세대 이동통신 시스템의 서비스는 음성, 텍스트, 멀티미디어 서비스의 고도화에 이어 일상 곳곳에 편재된 센서 및 컴퓨터들이 수집한 각종 환경정보를 효과적으로 상호 공유하여 사용자 및 주변 환경의 상황(context)을 알아내고 그에 맞는 다양한 정보에 근거하여 자발적으로 서비스를 제공하는 상황인식(context-aware) 특징을 가지게 될 것이다. 이러한 상황인식 서비스를 가능하게 하기 위해서는 사용자 및 사물 등의 객체를 인식하고, 이들의 현 상태에 따른 상황정보를 수집하여 서비스에 적응하는 기술 등이 필수적이다. 본 논문에서는 IMT-2000 이후의 차세대 이동통신 시스템의 진화방향을 상황인식 서비스 제공 관점에서 살펴보고, 상황인식 서비스를 위한 관련 기술과 차세대 이동통신 환경에서 상황인식 서비스가 어떻게 제공될 수 있을지를 살펴본다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2022.06a
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• pp.133-134
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• 2022

본 논문에서는 자율운항선박의 육상 관제 및 원격제어를 위해, 자율운항선박의 비상상황인식 기술 개발에 대한 기초연구를 수행한다. 자율운항선박 주변의 타선들의 이동 경로를 예측하고 이에 따라 자선의 이동경로와 비교하여, 충돌위험 영역을 식별함으로써 비상상황 인식이 가능하도록 한다. 먼저, 타선의 이동경로 예측을 위해서는 선박자동식별시스템 AIS 정보를 바탕으로, 해당 해역에서의 통항패턴을 분석하고 이를 기반으로 타선의 특정 시간 동안의 이동 경로를 예측한다. 예측된 타선의 이동경로와 함께 자선의 이동경로를 비교 분석함으로, 최근 접점 및 최근접점 거리 정보 기반의 충돌위험영역을 식별한다. 식별된 충돌위험영역의 위험도에 따라 육상 관제센터에서는 원격 제어를 통한 위험상황 회피가 가능하도록 활용할 수 있다. 제안된 방법은 AIS에서 얻어지는 실제 항적 데이터를 이용하여 초기 결과를 검증하였다.

• Journal of the Korea Society of Computer and Information
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• v.11 no.4 s.42
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• pp.165-174
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• 2006

As context aware service supports a process of context acquisition and reasoning, there are many studies to facilitate the implementation of context aware service. However, these studies have not supported efficiently a user or service mobility that should be supported necessarily in ubiquitous computing environment. Therefore, this study proposes a dynamic context aware service model which supports a dynamic management of context information, service retrieval and composition for interactions between services, and service mobility. Then we design a middleware based on this model and implement the middleware. As the middleware is implemented on the OSGi framework. it can have an interoperability between the devices such as computers, PDA, home appliances, and sensors, because of using the standard interface technologies like UPnP. Jini and so on.

• Proceedings of the Korea Information Processing Society Conference
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• 2010.04a
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• pp.355-358
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• 2010

모바일 환경이 발전하고 보편화됨에 따라 사용자의 상황정보를 인식하고 추론하여 서비스를 제공하는 상황인식 서비스에 대해 관심이 높아지고 있다. 상황인식 서비스는 사용자 및 주변 환경의 상황을 알아내고 공유하여 그에 맞는 서비스를 제공한다. 이를 위한 상황정보는 사용자의 요구와 주변 상황이 수시로 변화하는 이동통신 환경에서 중요하게 활용된다. 본 논문에서는 컨텍스트의 수집과 공유를 위해 안드로이드 기반의 컨텍스트폰 플랫폼과 컨텍스트 서버를 구현하여 사용자 상황 정보를 시각화 하고 서로 공유할 수 있게 하였다. 상황인식에 대한 연구에는 주로 위치 및 이동에 관한 연구가 많은 부분을 차지하고 있는데, 위치정보는 상황인식을 위해 반드시 필요한 정보이며 이를 통해 사용자의 현재 상황을 파악할 수 있는 중요한 정보로 활용되고 있다. 안드로이드 기반의 컨텍스트폰 플랫폼과 컨텍스트 서버, GPS를 이용하여 사용자의 위치를 추적하거나 찾아내어 실시간으로 상대방의 위치 정보와 사용자 간의 거리를 알아내어 공유하고 맵을 통해 사용자 위치를 파악하여 위치와 관련된 서비스를 제공하려 한다.

• Journal of Korean Tunnelling and Underground Space Association
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• v.20 no.6
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• pp.1161-1175
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• 2018

An unexpected event could be easily followed by a large secondary accident due to the limitation in sight of drivers in road tunnels. Therefore, a series of automated incident detection systems have been under operation, which, however, appear in very low detection rates due to very low image qualities on CCTVs in tunnels. In order to overcome that limit, deep learning based tunnel incident detection system was developed, which already showed high detection rates in November of 2017. However, since the object detection process could deal with only still images, moving direction and speed of moving vehicles could not be identified. Furthermore it was hard to detect stopping and reverse the status of moving vehicles. Therefore, apart from the object detection, an object tracking method has been introduced and combined with the detection algorithm to track the moving vehicles. Also, stopping-reverse discrimination algorithm was proposed, thereby implementing into the combined incident detection processes. Each performance on detection of stopping, reverse driving and fire incident state were evaluated with showing 100% detection rate. But the detection for 'person' object appears relatively low success rate to 78.5%. Nevertheless, it is believed that the enlarged richness of image big-data could dramatically enhance the detection capacity of the automatic incident detection system.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.31 no.10A
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• pp.960-967
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• 2006

Mobile communication is evolving toward next generation system that is capable to provide ubiquitous human-centric services with giving no restriction on time and location. In particular, context-awareness will be realized using various sensors and devices and related technologies under the ubiquitous Next Generation (NG) mobile communications environment where user's demand and surrounding context are changing dynamically. By such context awareness, context aware service which provides best suitable services for a user by analyzing user's needs and situational information, will be one of the promising NG mobile services. In this article, we propose NG mobile service environment with focusing on generic service traffic flows supported by the NG service platform which gives various means of connecting users and service providers. Then, we propose evolutional phases of context-aware services based on ranges of context information and evolutional trend of telecommunication technologies and networking environment in NG mobile service environment.

• The KIPS Transactions:PartC
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• v.8C no.6
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• pp.831-838
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• 2001

Mobile information service aims to provide some degree of effective information for real life activities of mobile users. Due to the user mobility and actual realism, it becomes very important technical issue to support an adaptive information service methodology to current situations of the terminal and/or user. This paper deals with a prefetching scheme for location-aware, out of the various context-aware which can be considered in mobile information service. It makes use of the velocity-based mobility model to shape the terminal and/or user's mobility behavior. Based on the moving speed and direction, the prefetching zone is proposed to define the number of prefetched information, so as to limit effectively the prefetched information whilst to preserve the location-aware adaptability. Using a simulator, the proposed scheme has been evaluated in the effectiveness point of view. The idea in this paper is expected to be able to extended to the other mobile service contexts, such as service time, I/O types of mobile terminals, network bandwidth.

• Journal of the Korea Society of Computer and Information
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• v.11 no.5 s.43
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• pp.105-114
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• 2006

Context-Awareness is a important technology to support optimized services automatically by recognizing various context informations in ubiquitous environments. Previous middlewares which supports ubiquitous environments used a centralized storage and DBMS to store and manage context informations and service contents. Centralized management of context informations and service contents sometimes hinders the autonomy of moving node and interoperability between difference middlewares. In this paper, we design the systems which stores context informations in moving node by distributed form and shares service contents between middlewares in distributed ubiquitous environments. And it provides Context-Aware scripts to supports the definition of context informations reasoning and execution of services. It verifies the usefulness of the designed systems by applying the scenario of music playing service based on context awareness

• Journal of Intelligence and Information Systems
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• v.11 no.1
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• pp.53-63
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• 2005

Adaptive services need to become as mobile as their users and be extended to take advantage of the constantly changing context in which they are accessed. Context-awareness is a technology to facilitate information acquisition and execution by supporting interoperability between users and devices based on users' context. The objective of this study is to develop a middleware fer dealing with context-awareness in ubiquitous computing. To achieve it, our middleware plays an important role in recognizing a moving node with mobility by using a bluetooth wireless communication technology as well as in executing an appropriate execution module according to the context acquired from a context server. In addition, for verifying the usefulness of the Proposed middleware, we develop an application system which Provides a music playing service based on context information by using our context middleware.

• 한국HCI학회:학술대회논문집
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• 2008.02a
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• pp.534-539
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• 2008

This paper is about intelligent hexapod robot for the support walking of the aged person. The robot using various sensors and small camera has various abilities of forward backward walking, turing left or right, control the speed of walking, avoiding the obstacles and detecting risky situation of fire or gas. To let the aged feel soft and safe walking, we used special servo motor and developed hexapod walking mechanism and effective algorithm.