• 대한임베디드공학회논문지
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• 제5권1호
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• pp.23-28
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• 2010

The automotive industry tries to provide infotainment systems to emerging automobiles. Since the infotainment systems require various peripheral devices and network connectivity, legacy operating systems such as Linux and Windows can be much preferred due to its plentiful device drivers and multimedia applications while the operating systems following OSEK standard are used for automotive electronic control units. Thus it is highly desired that the system software supporting infotainment applications can be portable over different legacy operating systems providing unified programming interfaces. The majority of legacy operating systems support POSIX interfaces for application development. MOST is an automotive network standard for infotainment systems. Network Service defines the protocol stacks for MOST control data, which is essential to implement infotainment applications over MOST. In this paper, we suggest a POSIX-based Network Service so that we can utilize legacy device drivers and applications for automotive infotainment systems. We measure the performance of the POSIX-based Network Service and show that its overhead is not significant.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 심포지엄 논문집 정보 및 제어부문
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• pp.289-290
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• 2007

UPnP Bridge supporting diverse network interface has to meet standard requirements in order to be connected with legacy devices. It is able to provide or bridge a service description and device description according to a specification because IEEE1394 and USB have this standard requirements. But it is difficult to know whether it RS232C supports only serial communication and packet transfer. It need a document for the standard definition of communication protocol on UPnP device having such interface. By doing so, this document can understand device and packet type. This paper defines MFD(Message Field Description) and makes UPnP message converter. So it will be base to standardize supporting variable legacy device.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2003년도 봄 학술발표논문집 Vol.30 No.1 (C)
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• pp.253-255
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• 2003

Electricity is the prime commodity in mobile device, e.g. smart phone, PDA, MP3 player and etc. This strict restriction on power consumption requirement of the mobile device puts unique demand in designing hardware and software components of the device. In this paper, we address the issue of minimizing the power consumption in retrieving the continuous media data from the disk drive for real-time playback purpose. Different from the legacy text based data, real-time multimedia playback requires that the storage supplies the data block continuous fashion. This may put immense burden on the power scarce environment since the disk Is required to be active for the entire playback duration. We develop elaborate algorithm which carefully analyzes the power consumption profile of the disk drive and which establishes the data retrieval schedule for the given playback. It computes the amount of data blocks to read, the length of active and standby period. According to our simulation result, the ARM algorithm exhibits superior performance in continuous media retrieval from the aspect of power consumption to legacy playback scheme.

• KEPCO Journal on Electric Power and Energy
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• 제6권3호
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• pp.253-257
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• 2020

현장정보처리장치는 아날로그형 전력설비의 전압, 전류, 디지털 전기신호를 IEC 61850 기반 데이터로 변환하여 정보를 처리하는 장치이다. 이는 아날로그형 전력설비의 운전 정보를 취득 및 처리하고, 전력설비의 제어를 수행하며, 내부 로직을 이용하여 인터록 기능 등을 수행한다. 특히, 다수의 보호계전기 입출력 신호를 하나의 장치에서 처리하기 때문에 장치의 입출력 정보를 처리하는 데이터 변환시간이 중요하다. 본 논문에서는 현장정보처리장치의 IEC 61850 통신 기능 및 입출력 데이터 변환시간을 측정할 수 있는 시험 방법과 사례를 소개하고자 한다.

• 한국정보통신학회논문지
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• 제14권9호
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• pp.2134-2142
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• 2010

가정에서 사용중인 가전제품을 제어하는 방법은 적외선 리모컨을 이용한 방식이 대부분을 차지하고 있다. 이러한 레거시 기기들은 각각의 리모컨으로 제어되고 있고 표준화된 통신방식을 제공하지 않아 원격 제어에 어려움이 있다. 통합 리모컨방식의 원격 제어기를 이용할 경우 여러 종류의 기기를 제어할 수 있지만 모든 명령을 지원하지는 않으며, 특히 새로운 명령이나 고유한 명령을 가진 제품이 출시될 경우 확장성에 한계가 있다. 본 논문에서는 레거시 기기의 효율적인 통합 제어를 위해 지그비로 전송되는 명령을 해당 기기의 적외선 제어 명령으로 변환하여 발신하는 Zigbee Bridge를 개발하고, 헤더 판별법을 이용한 학습 기능을 추가 하였다. 새로운 명령이 전송되는 경우 Bridge는 이 명령을 학습하여 저장하며, 기존 명령이 전송되는 경우 저장된 코드를 출력하는 방식을 사용하였다. 이 방식을 사용하는 경우 신규 명령에 대한 확장성과 유연성을 확보 할 수 있으며, 코드 전송의 효율을 향상하여 기존 대비 최대 58.6배 빠른 전송이 가능하다.

• 전기학회논문지
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• 제64권5호
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• pp.779-785
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• 2015

Recently, home energy management system (HEMS) for power consumption reduction has been widely used and studied. The HEMS performs electric power consumption control for the indoor electric device connected to the HEMS. However, a traditional HEMS is used for passive control method using some particular power saving devices. Disadvantages with this traditional HEMS is that these power saving devices should be newly installed to build HEMS environment instead of existing home appliances. Therefore, an HEMS, which performs with existing home appliances, is needed to prevent additional expenses due to the purchase of state-of-the-art devices. In this paper, an intelligent inference algorithm for EMS at home for non-power saving electronic equipment, called legacy devices, is proposed. The algorithm is based on the adaptive network fuzzy inference system (ANFIS) and has a subsystem that notifies retraining schedule to the ANFIS to increase the inference performance. This paper discusses the overview and the architecture of the system, especially in terms of the retraining schedule. In addition, the comparison results show that the proposed algorithm is more accurate than the classic ANFIS-based EMS system.

• Journal of information and communication convergence engineering
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• 제9권1호
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• pp.1-5
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• 2011

Everyday, technology is evolved in many different disciplines. Computer and smart devices revolution take part of the evolved technology that continuously promising new features. Moreover, social networks services recently become widely popular, which most people in the world become a social-network-fond. In addition to the revolution of the evolved technology and social networks services, ubiquitousness is taking significant part in our daily lives. Although, there are many e-learning systems already existed, which use Internet technology along with a Web technology to provide education in various ways, in despite of that, there is no such existing system exploits the usefulness of smart devices along with the legacy of the online social networks besides the power of the ubiquitous computing technology. Therefore, we propose a smart device application, which fills the gap that has been missing in the recent contemporary era. It is an application that runs on smart devices particularly Smartphone devices; we call our system “Smart Device based Social E-learning System(SDES)”. We have preliminary implemented our system on Android OS. In this paper, we intentionally propose the system in order to ease the way people learn, to provide interactive accessibility in our system, and to utilize the advanced technology more wisely.

• 한국통신학회논문지
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• 제42권2호
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• pp.338-344
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• 2017

본 논문에서는 송신단, 수신단, 중계 전송단에서 모두 다중 안테나를 가지고 양방향 중계 증폭 전송 방식으로 동작하는 통신 환경을 고려한다. 양방향 중계 전송에서 발생하는 자기 간섭을 한 쪽의 수신단에서는 제거할 수 있고, 다른 한 수신단에서는 제거할 수 없는 상황에서 최대 전송률을 보내기 위해 릴레이 구조를 최적화하는 것을 목표로 한다. 먼저 최대 전송률을 구하기 위하여 GD(gradient descent) 기반의 지역 최적화 알고리즘을 개발하고, 보다 간단한 구조를 가지는 특이값 분해(SVD: singular value decomposition) 기반의 블록 삼각화 방법을 제안한다. 시뮬레이션 결과는 제안하는 양방향 기법들이 기존의 양방향 방법에 비해 자기간섭 제거 기능이 없는 기기가 상용될 때 향상된 성능을 얻는다는 것을 보여준다.

• 한국정보시스템학회지:정보시스템연구
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• 제23권1호
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• pp.185-202
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• 2014

ERP, a typical enterprise application, helps companies to increase their productivity and to support their decision makings. ERP is composed of diverse functions that are optimized under PC environment, whereas the ERP applications on a mobile platform have many constraints such as a small screen, limited resolution, and computing power. Because all the functions of a ERP legacy system are not required for ERP on a mobile device, the core functions of the ERP system should be selected to increase system efficiency. In this study, two main methods were used; interviews and log analyses. The end users using a ERP system were interviewed for their perceptions, and log data analyses were made for the hitting number of specific ERP functions. The differences between the actual usage based on log data and users' cognitive preferences about ERP functions were analysed. Finally, the functional differences between users' perception and actual usage were suggested for some practical implications.

• 한국IT서비스학회지
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• 제13권1호
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• pp.125-134
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• 2014

Device discovery for D2D (device-to-device) communication enables a device to discover other devices in order to initiate communication with them. Devices should perform the discovery phase using a small quantity of radio resource in a short time and be able to reduce the load of the base station. Legacy device discovery schemes have focused on discovering as many target devices as possible. However, it is not appropriate for peer-to-peer D2D communication scenario. Further, synchronization problems are an important issue for discovery signal transmission. This paper proposes a discovery method that one requesting device discovers a specific target for communication. Multiple antenna beamforming is employed for the synchronization between the base station and a target device. The proposal can reduce the load of the base station using the information that it already maintains and improve the reliability of the device discovery because two times of synchronizations using beamforming among the base station and devices can make the exact discovery of a target device with mobility possible.