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강철웅(Chul-Ung Kang),고석준(Seok-Jun Ko),심기범(Ki-Bum Sim) 한국정보기술학회 2012 한국정보기술학회논문지 Vol.10 No.11
In order to enhance the reproducibility, we developed an impact device to remedy the existing devices shortcoming of spinal cord injury model. The impactor is fixed for structure based on motion controller and electric cylinder. It is able to induce accurate impact location and maximize the reproducibility by using camera and laser sensor. Moreover, it has another advantage that can produce an experimental model indicating desired lesion. This is because it can directly set the variable related with amount of impact. Because it, in comparison to the previous impactor, functions contusion method and compression method with only one device, it is able to realize a diverse range of impact model. For this study, we first collected the force data of load-cell attached in impact area, and location data of cylinder stroke through experiment. Next, we quantify the amount of impact on the basic of the above data.
위치인식기반서비스를 활용한 능동형 도로기상 교통정보시스템
강철웅(Chul-Ung Kang),고석준(Seok-Jun Ko) 한국정보기술학회 2012 한국정보기술학회논문지 Vol.10 No.10
Traffic accidents occur when either factor is in unsafe conditions among human, road, weather, traffic condition and environment. Especially, unstable weather conditions such as adverse weather condition that makes visibility of drivers and adaptability of road surfaces friction lower and has a negative effect on stability and mobility of highway that could increase probability of accident and injury severity. In this study, with collected real-time weather information, we applied LBS to construct a system that is capable to actively provide for information. After comparing, and analyzing in location information of costumers movement direction, the system can recognize weather conditions such as foggy, rain, and snow. Further, real-time alarm service is given in this system when costumer approach, which plays pivotal role to establish an active information of road and traffic.
장치 독립적 디지털 콘텐츠 제공을 위한 CC/PP프로파일 생성 시스템 설계 및 구현
변영철,강철웅,이상준,Byun Yung-Cheol,Kang Chul-Ung,Lee Sang-Joon 한국정보통신학회 2006 한국정보통신학회논문지 Vol.10 No.9
유비쿼터스 컴퓨팅 환경에서 서버가 다양한 유형의 단말기에 대해 각각의 장치에 적합한 콘텐츠를 효과적으로 제공하기 위해서는 단말기 정보 및 관련 상황정보를 알고 있어야 한다. CC/PP 표준 스펙은 하드웨어, 소프트웨어, 네트워크, 사용자 취향정보 등을 기술하고 전송하기 위한 규약으로서, RDF을 이용하여 단말기 프로파일 정보를 기술한다. 한편, WAP 포럼에서는 클라이언트가 이러한 CC/PP 프로파일 정보를 스스로 서버에게 전송할 수 있도록 하기 위한 프로토콜로서 W-HTTP 프로토콜을 정의하였다. 하지만 기존의 HTTP 프로토콜을 이용하는 클라이언트의 경우 CC/PP 프로파일 정보를 서버에게 제공하지 못하는 문제가 발생 한다. 본 논문에서는 W-HTTP 프로토콜 클라이언트뿐만 아니라 HTTP 프로토콜을 이용하는 클라이언트에 대해서도 CC/PP 프로파일을 생성하여 서버에게 제공하기 위한 미들웨어 시스템을 설계하고 구현한다. The server system of digital contents has to how the context information about client devices to provide the appropriate contents for each device effectively. CC/PP standard specification is an agreement for describing and transmission of the information related with a client device. In this case, the information on device hardware and software, networks and user's preference is included here. In the mean time, WAP forum defined W-HTTP protocol to transmit the CC/PP profile information of a client device to a server system. However, the client devices which use existing HTTP protocol to transmit their information cannot provide the CC/PP profile information to a server. In this paper, we propose an effective method to create and provide the CC/PP profile in the clients which use not only HTTP protocol but also W-HTTP protocol to transmit device information.
복잡한 목표물의 Glint와 RCS 모델링 및 시뮬레이션
송승언,신한섭,김대오,강철웅,고석준,Song, Seungeon,Shin, Han-Seop,Kim, Dae-Oh,Kang, Chul-Ung,Ko, Seokjun 대한임베디드공학회 2017 대한임베디드공학회논문지 Vol.12 No.1
The signal transmitted from radar is not reflected from a single point when the signal reflected by complex target. Resultantly, the amplitude and phase of the received signal can be changed because the target has lots of scatterers. The changes of the amplitude and the phase mean Glint and RCS, respectively. Although the Glint and RCS that caused by the same scatters are uncorrelated, however, they are not independent completely. Therefore, this paper proposes a method for generating the Glint and RCS by using same random number generator. And the time correlations of the Glint and RCS are respectively implemented in frequency domain by using each power spectral density of them.
저전력 장거리 무선 기술을 이용한 스마트 도어락 시스템
강형규(Hyung-Kyu Kang),변영철(Yung-Cheol Byun),강철웅(Chul-Ung Kang) 한국정보기술학회 2018 한국정보기술학회논문지 Vol.16 No.2
Nowadays, a lot of researches and development of technologies have been done to implement practical smart home systems. Also, with the spread of smart phones and tablet PCs, products utilizing those devices have been applied in our real life in various way. An access control system using mobile devices is considered as one of the main components for smart home implementation. In this paper, we propose a smart door lock system using LoRa (Long Range) wireless technologies. The proposed system consists of a door system that collects user information and controls door locking, and an AAM (Access Authentication Management) server that authenticates a user and records access information for the user. Authentication for access is performed by comparing acquired user’s information and DB in the server. Therefore, a user can conveniently access a door with his/her smart phone as long as the user is registered in a server.
무인모선기반 무인잠수정의 3차원 위치계측 기법에 관한 연구
임종환(JONG-HWAN LIM),강철웅(CHUL-UNG KANG),김성근(SUNG-KYUN KIM) 한국해양공학회 2005 韓國海洋工學會誌 Vol.19 No.2
A 3-D localization method of an autonomous underwater vehicle (AUV) has been developed, which can solve the limitations of the conventional localization, such as LBL or SBL that reduces the flexibility and availability of the AUV. The system is composed of a mother ship (small unmanned marine prober) on the surface of the water and an unmanned underwater vehicle in the water. The mother ship is equipped with a digital compass and a GPS for position information, and an extended Kalman filter is used for position estimation. For the localization of the AUV, we used only non-inertial sensors, such as a digital compass, a pressure sensor, a clinometer, and ultrasonic sensors. From the orientation and velocity information, a priori position of the AUV is estimated by applying the dead reckoning method. Based on the extended Kalman filter algorithm, a posteriori position of the AUV is, then, updated by using the distance between the AUV and a mother ship on the surface of the water, together with the depth information from the pressure sensor.