• Proceedings of the Korea Information Processing Society Conference
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• 2012.11a
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• pp.33-35
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• 2012

최근 와이파이, 블루투스 등 근거리 무선 통신 기술의 발달로 홈네트워크, U-City, 홈오토메이션 등의 실생활 적용이 가능해졌다. 이미 삼성, LG 등의 기업에서는 관련 제품을 양산 및 판매하고 있으며 그 기술의 관련연구 또한 활발하게 진행되고 있다. 하지만 이러한 기존 제품 및 시스템들은 가격이 높고 인터넷을 기반으로 운용되기 때문에 AP (Access Point)가 반드시 존재하여야 하며 가정 내의 모든 전자기기들을 연동시키기 위해 구현이 복잡하다는 문제점을 갖는다. 본 논문에서는 이를 해결하기 위해 기존 와이파이 다이렉트 및 블루투스의 D2D (Device-to-Device) 기술을 적용하여 AP의 필요성을 없애고 불필요한 연동을 제외하며 간단한 구현을 요구하는 저가의 제품을 개발하고자 한다. 실험적인 구현을 위해 모터 및 카메라 제어, 타이머, 통신 등이 가능한 AVR ATmega169 마이크로 컨트롤러와 스마트폰을 사용하여 원격 디지털도어락 관리 시스템을 제안한다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.12 no.11
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• pp.5404-5424
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• 2018

This work is mainly focused on two major topics in cloud platforms by using OpenStack as a case study: management and provisioning of resources to meet the requirements of a service demanded by remote end-user and relocation of virtual machines (VMs) requests to offload the encumbered compute nodes. The general framework architecture contains two subsystems: 1) An orchestrator that allows to systematize provisioning and resource management in OpenStack, and 2) A resource utilization based subsystem for vibrant VM relocation in OpenStack. The suggested orchestrator provisions and manages resources by: 1) manipulating application program interfaces (APIs) delivered by the cloud supplier in order to allocate/control/manage storage and compute resources; 2) interrelating with software-defined networking (SDN) controller to acquire the details of the accessible resources, and training the variations/rules to manage the network based on the requirements of cloud service. For resource provisioning, an algorithm is suggested, which provisions resources on the basis of unused resources in a pool of VMs. A sub-system is suggested for VM relocation in a cloud computing platform. The framework decides the proposed overload recognition, VM allocation algorithms for VM relocation in clouds and VM selection.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2009.05a
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• pp.777-780
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• 2009

학교의 컴퓨터 실습실 환경에서 컴퓨터들의 교육용 관리, 제어 시스템으로 교육의 질적 성장욕구에 적극적으로 대응하고, 교육환경을 효과적으로 지원하여 보다 관리하기 편리한 실습실 환경을 구축하기 위한 강의지원 시스템을 구현한다. 시스템의 기능으로 학습자의 화면을 실시간으로 모니터링할 수 있어 수업상황을 관리, 감독할 수 있다. 그리고 원격제어를 이용하여 특정 학습자와 1:1 개별학습이 가능하다. 또한, 강사의 실습화면을 학습자 컴퓨터로 전송, 전원제어, 채팅, 실습 컴퓨터 Lock 기능 등이 있다. 이 시스템으로 인한 기대효과로 수업의 집중화, 인적자원의 낭비 최소화, 시간적 자원의 낭비 최소화, 편의성 증대 등을 들 수 있다.

• Journal of Korean Academy of Rural Health Nursing
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• v.16 no.2
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• pp.54-59
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• 2021

Purpose: This study aimed to describe a school health teacher's experience working in a mountain village during the COVID-19 outbreak in 2021. Methods: The study used a case study method based on the school records and reports to the local office of education. Results: In T City, since the first COVID-19 case confirmed on March 8, 2020, as of May 17, 21, a total of 21 cases have occurred, including two third-year students of H Middle School. Since then, one additional case was confirmed on May 18, one more on May 25, and one more on May 27, resulting in a total of five confirmed cases. During this period, 42 students and 13 teachers were self-quarantined, all students and staff were tested for COVID-19 PCR, and students received remote classes. The role of school health teacher can be described through three categories: "collaborator", "care coordinator", and "educator". The school health teacher did a lot of work until the situation came to an end, successfully fulfilling these three roles. Conclusion: Some suggestions were made to prepare a more effective communicable disease response system suitable for public health infrastructure of non-urban area.

• Journal of Industrial Convergence
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• v.20 no.7
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• pp.51-56
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• 2022

Recently, interest in fencing is getting increased in Korea due to good results in international fencing competitions and its exposure to the media. However, one of the difficult factors in entering fencing is the cost of initial equipment purchases. Solving this can contribute to expanding the base of fencing. For this reason, this study designed and developed a system that can replace the function of the remote control with a mobile application using Bluetooth communication and learn the function of the fencing scoreboard and fencing terms in French. Through interviews, fencing leaders and club members were asked to find out what was necessary in this study, and to mention the pros and cons of the test operation. It is expected that the fencing scoreboard will be lightweight and small, and it will help to spread fencing through cost reduction.

• Journal of Animal Environmental Science
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• v.8 no.3
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• pp.199-208
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• 2002

This paper introduces the method to make management network about milking cow farm tasks. The object of this research was to design of biological measuring system and managing network system in a livestock farm. This auto-management system provides informations about individual cows' temperature, conductivity of milk and weight for efficient management of feeding, and milking works by a micro-processor and RS -485 type serial COM. ports. And measured bio-data which are basic informations for remote raising management are saved to user PC by serial communication between the PLC and user PC. Milking cow farm is divided into three working place to each measurement work and feed. The first working place is milking station which has two thermometers, a conduct meter and a scale set. The second working place is feeding station, and the third place is cattle cage. These are combined by network system and the PLC which is used to drive network and sub-modules. Sub-modules have a micro-process to control the sensor and to interface with network. The PLC which drive network and control sequence has two serial communication port to be linked with user PC for sending the measured data and for receiving data. Above all, in this study tells the sequence operating method by the driving scenario of breeding milk cow for livestock auto-management using the PLC and network system.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.6 no.4
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• pp.315-324
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• 2005

VOD(video on demand) is a video service by users' order, that is, a video service on demand. That means the users can select and watch the video content that has been saved on sewer, out of broadcasting in the usual process like TV. At present the client of VOD system bases on PC. As the PC-based client uses the software MPEG decoder, the main processor specification has an effect on the capacity. Also people, who don't know how to use their PC, cannot be provided the VOD service. The purpose of this paper is to show the process of the development the VOD client system Into the embedded type with hardware MPEG-4 decoder. The main processor is the SC1200 of x86 Family in National Semiconductor with a built-in video processor and the memory is 128Mbyte SDRAM. Also, in order that the VOD service can be provided using the Internet, the Ethernet controller is included. As the hardware MPEG-4 decoder is used in the embedded VOD client system, which is developed, it can make the low capacity of the main processor. Therefore it is able to be developed as a low-price system. The embedded VOD client system is easy for anyone to control easily with the remote control and can be played through TV.

• Aerospace Engineering and Technology
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• v.4 no.2
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• pp.107-116
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• 2005

As a unique payload of Komsat-2, MSC, comprising EOS(Electro-Optical Sub-system), PMU(Payload Management Unit) and PDTS(Payload Data Transmission Sub-system), is supposed to take pictures of one panchromatic and 4 multi-spectral image between wavelength 450mm~900mm, and is being under final Satellite I&T. It will perform the earth remote sensing with applications such as acquisition of high resolution images, surveillance of large scale disasters and its countermeasure, survey of natural resources, etc.. Under the hostile influence of the extreme space environmental conditions due to deep space and direct solar flux, the thermal design is especially of major importance in designing a payload. There are tight temperature range restrictions for electro-optical elements while on the other hand there are low power consumption requirements due to the limited energy source on the spacecraft. This paper describes details of thermal control system for MSC.

• Proceedings of the KSRS Conference
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• 2004.10a
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• pp.344-346
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• 2004

IKONOS 1m satellite imagery is particularly well suited for 3-D feature extraction and 1 :5,000 scale topographic mapping. Because the image line and sample calculated by given RPCs have the error of more than 11m, in order to be able to perform feature extraction and topographic mapping, rational polynomial coefficients(RPCs) camera model that are derived from the very complex IKONOS sensor model to describe the object-image geometry must be refined by several Ground Control Points(GCPs). This paper presents a quantitative evaluation of the geometric accuracy that can be achieved with IKONOS imagery by refining the offset and scaling factors of RPCs using several GCPs. If only two GCPs are available, the offsets and scale factors of image line and sample are updated. If we have more than three GCPs, four parameters of the offsets and scale factors of image line and sample are refined first, and then six parameters of the offsets and scale factors of latitude, longitude and height are updated. The stereo images acquired by IKONOS satellite are tested using six ground points. First, the RPCs model was refined using 2 GCPs and 4 check points acquired by GPS. The results from IKONOS stereo images are reported and these show that the RMSE of check point acquired from left images and right are 1.021m and 1.447m. And then we update the RPCs model using 4 GCPs and 2 check points. The RMSE of geometric accuracy is 0.621 m in left image and 0.816m in right image.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.18 no.1
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• pp.1-8
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• 2018

While the number of passengers using urban railroads is increasing day by day, the number of complaints from passengers is also increasing. In order to resolve problems caused by poor communication between urban railroad officials and passengers in this paper. An IOS application using the Internet of Things (IoT) technology is proposed for providing safety and comfort temperature service(s) and for taking prompt action(s) of passengers complaints. In this proposal system, the temperature & humidity sensors were placed in a suitable location within the train. At the same time, transferring measurements to the remote server, allowing passengers to request their desired temperature through the IOS Application. Like this based on the collected data, I suggest a system that urban railroad officials can control temperature & humidity of the train. The proposed system was implemented by the Gwangju Metro Line 1 to validate its effectiveness.