• 한국정보통신학회논문지
• /
• 제11권7호
• /
• pp.1305-1310
• /
• 2007

이포지션(eposition)은 유무선 인터넷을 통하여 지구상의 특정 위치를 고유한 위치식별 ID로 정보를 서비스할 수 있는 기술이다. 현재 ePosition 기술을 이용하여, 인터넷 기반의 육상위치정보 서비스를 제공하고 있으나, 해양자료 및 해양위치정보 서비스를 위한 기술은 아직까지 부족한 실정이다. 특히 해양 위치정보 서비스를 위해서는 국제수로기구(IHO)의 디지털 수로데이터 전송표준인 S-57 기반의 전자해도(ENC) 연계기술이 절실히 필요하다. 따라서 본 논문에서는 ePosition 기술의 해양관련 분야 응용을 위한 기반기술을 확보하고, 전자해도에 적용 및 활용하기 위한 상호 연계기술을 개발하고자 한다. 구체적인 연구방법으로는, 먼저 전자해도(ENC) 데이터 모델과 구조를 분석하고, 전자해도 파일을 ePosition 데이터로 처리 하기 위해서 변환한다. 그리고 ePosition 데이터베이스와 연계할 수 있는 방법을 도출하여, 연계된 데이터를 기반으로 하는 ePosition 서비스의 활용과 그 효용성을 살펴본다.

• Journal of Information Processing Systems
• /
• 제18권5호
• /
• pp.614-627
• /
• 2022

Aspect-based sentiment analysis is to discover the sentiment polarity towards an aspect from user-generated natural language. So far, most of the methods only use the implicit position information of the aspect in the context, instead of directly utilizing the position relationship between the aspect and the sentiment terms. In fact, neighboring words of the aspect terms should be given more attention than other words in the context. This paper studies the influence of different position embedding methods on the sentimental polarities of given aspects, and proposes a position embedding interactive attention network based on a long short-term memory network. Firstly, it uses the position information of the context simultaneously in the input layer and the attention layer. Secondly, it mines the importance of different context words for the aspect with the interactive attention mechanism. Finally, it generates a valid representation of the aspect and the context for sentiment classification. The model which has been posed was evaluated on the datasets of the Semantic Evaluation 2014. Compared with other baseline models, the accuracy of our model increases by about 2% on the restaurant dataset and 1% on the laptop dataset.

• 한국정보통신학회:학술대회논문집
• /
• 한국정보통신학회 2017년도 춘계학술대회
• /
• pp.267-268
• /
• 2017

본 논문에서는 어레이 형태로 제작된 압력센서(FSR402)를 이용하여 누워있는 환자의 자세를 판별하였고, air cylinder를 릴레이보드로 제어하여 실린더 상단에 연결된 침대를 상승, 하강 할 수 있도록 하여 환자의 자세를 변화 시켜 수면 중 환자의 자세를 변환 시켜 폐쇄성 수면 무호흡 치료에 도움을 줄 수 있는 시스템을 개발하였다.

• 동력기계공학회지
• /
• 제20권3호
• /
• pp.22-28
• /
• 2016

Energy consumption rapidly increases with industrial development. therefore an interest in the efficiency of various power converters is increasing. Especially, the field of high-efficiency small motors widely distributed for industrial and family use is considered a very important field in terms of efficient energy usage, and accordingly, in the field of small electric equipment, the use of BLDC that allows high-efficiency drive in an inductor gradually increases. However, for the BLDC drive, information on the position of the rotor is essential. Both methods using a magnetic encoder and an optical encoder to detect the information on the position of the rotor obtain the information by three position sensitive devices, and if any one of these position sensitive devices fails to function, no positional information can be obtained, so there is a limitation in implementing a position sensor with high reliability. In the paper, proposes a new type of encoder that can obtain the positional information on the position of the rotor using a single position sensor in order to overcome the issues that it has to use numerous signal flows and that the reliability is reduced for the acquisition of positional information generated by using multiple position detectors. The encoder in the proposed method replaced the function of generating positional information from multiple sensors with the shape of the encoder plate and the capture function of MICOM. In order to verify the validity of the position detection technique by the proposed encoder, a prototype was produced, and an experiment using the capture function of DSP was conducted through this.

• 한국정보처리학회논문지
• /
• 제7권7호
• /
• pp.2050-2059
• /
• 2000

In a video-on-Demand(VOD) service, a server has to return to he normal playback quickly at a certain new frame position after interactive operations such as jump or last playback. In this paper, we propose an efficient scheme to write a transmission schedule for a playback restart of a video stream at a new frame position after interactive operations. The proposed scheme is based on convergence characteristics, that is transmission schedules with different playback startup frame position in a video stream meet each other at some frame position. The scheme applies a bandwidth smoothing from a new frame position to a convergence position without considering all remaining frames of a video stream. And then the scheme transmits video dta according to the new schedule from the new frame position to the convergence position, and then transmits the remaining video data according to the reference schedule from the convergence position, and then transmits the remaining video data according to the reference schedule from the convergence position to the last frame position. In this paper, we showed that there existed the convergence position corresponding to nay frame position in a video stream through many experiments based on MPEG-1 bit trace data. With the convergence we reduced the computational overhead of a bandwidth smoothing, which was applied to find a new transmission schedule after interactive operations. Also, storage overhead is greatly reduced by storing pre-calculated schedule information up to the convergence position for each I frame position of a video stream with video data off-line. By saving information on a transmission schedule off-line along with the video data and searching the schedule corresponding to the specified restarting frame position, we expect the possibility of normal playback of a video stream with small tolerable playback startup delay.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2004년도 심포지엄 논문집 정보 및 제어부문
• /
• pp.144-146
• /
• 2004

It is known that Global Positioning System(GPS) is the most efficient navigation system because it provides precise position information on the all areas of Earth regardless of metrology. Until now, the size of GPS receivers has become smaller and the performance of receivers has become higher. So receivers provide the position information of not only static system but also dynamic system. Usually, users make similar movement trajectory according to their life pattern and it is possible to build up efficient database by collecting only the repeated users' position. Because position information calculated by the receiver is erroneous about 10-30m within 5% error tolerance, the position information is oscillated even on the same area. In this paper, we propose the system that can estimate whether users are out of trajectory or in dangerous situation by soft-computing method.

• Journal of Electrical Engineering and Technology
• /
• 제11권4호
• /
• pp.931-938
• /
• 2016

Application of vector control scheme for consumer products is enlarging to improve control performance. For the field-oriented control, accurate position detection is essential and generally requires expensive sensors. On the other hand, cost-reduction is important in home appliances, so that binary-type Hall-effect sensors are commonly used rather than using an expensive sensor such as an encoder. The control performance is directly influenced by the accuracy of the position information, and there exist non-uniformities related to Hall sensors in electrical and mechanical aspects, which result in distorted position information. Therefore, to get high-precision position information from low-resolution Hall sensors, this paper proposes a new position estimator consisting of a Kalman filter and feedforward compensation scheme, which generates a linearly changing position signal. The efficacy of the proposed scheme is verified by simulation and experimental results carried out with a 48-pole permanent magnet motor.

• 전기학회논문지
• /
• 제65권4호
• /
• pp.659-665
• /
• 2016

In this paper, we propose a novel position accuracy enhancement method of a low-end GPS using digital map information. The latest digital map has various kinds of information on geographical features. The proposed method uses position information of lane marks among the geographical features. We define the position information of lane marks as the reference points. The position information of a low-end GPS acquired for a period of time is defined as the source points. In the proposed method, rotation and translation matrices between the reference and the source points are calculated by using an Iterative Closest Point(ICP) algorithm. The source points are transformed by the obtained rotation and translation matrices. Finally, the transformed source points are projected on the reference points. Through these processes, the position accuracy of a low-end GPS is ultimately enhanced. To verify the proposed method, the various real experimental results are presented.

• 한국콘텐츠학회논문지
• /
• 제8권4호
• /
• pp.264-272
• /
• 2008

이포지션(ePosition) 서비스는 유무선 인터넷을 통하여 지구상의 특정 지점의 위치정보를 물리적 주소 대신 그에 대응되는 고유한 위치식별 ID인 논리적인 주소로 제공하는 기술이다. ePosition 서비스를 활용하여 임의의 단말기를 이용하는 사용자에게 유무선 인터넷을 통하여 분산된 다수의 ePosition 서버를 지원하는 유비쿼터스 지리정보 서비스를 제공하기 위해서는 실제로 위치 정보가 저장 관리되는 ePosition 서버의 도메인네임을 레지스트리에 등록 저장함으로써 원하는 위치정보가 저장되는 ePosition 서버 접속이 자동적으로 이루어지도록 하는 것이 바람직하다. 또한 이미 표준으로 정해져 있는 DNS와 연계하여 ePosition 서비스를 효율적으로 제공하기 위해서는, DNS 서비스를 위한 표준규격을 만족하는 범주 내에서 ePosition서버의 도메인네임을 지정하여 등록할 수 있도록 새로운 리소스 레코드 타입을 정의할 필요가 있다. 본 논문은 ePosition 서비스를 위한 DNS 리소스 레코드를 정의하여 ePosition 서비스를 제공하는 시스템을 구현함으로서, 이미 구축되어 있는 DNS 기반의 인터넷과 연동이 원활하게 이루어지고 확장성이 뛰어나며 효율적인 ePosition 기반의 새로운 위치정보제공 서비스 방안을 제안한다.

• 디지털산업정보학회논문지
• /
• 제14권4호
• /
• pp.109-116
• /
• 2018

This research proposed management plan of internal lecturer who is in charge of job training of researchers working in administrative, researching and developing institutes or public institutions related to information security. The education and training department of the government or public institutions selects and manages lecturers in member of the staff. We applied to the management plan of internal lecturers who are in charge of information security job training by analyzing the way in which internal lecturers are operated by public organizations or corporations. We propose the management plan of internal lecturer according to the position, because the institute of information security is applying the researcher 's position(rank) system. By the proposed circulation management plan by the position, the internal lecturer position is determined according to the position of the employees to be trained and the internal lecturer is selected and operated only at the same position. The proposed management plan includes internal lecturer selection, responsibilities and duties, education, evaluation, and training support.