• 한국자동차공학회논문집
• /
• 제24권4호
• /
• pp.401-407
• /
• 2016

For high fuel economy, many kinds of unit in vehicle have been developed. In steering system, as a result, HPS(Hydraulic Power Steering) system has been replaced as EHPS and EPS system. But the structures of these systems are totally different, and that causes the uncertainty of fuel economy evaluation. Therefore we undertake to research to find results and tendency of fuel economy and energy in steering system. For accurate evaluation, we modeled different types of steering systems on same vehicle model. The simulation came into action on various driving cycle. The driving condition is designed to show standby power of pump. Results show differences of fuel efficiency and energy consumption.

• 설비공학논문집
• /
• 제27권4호
• /
• pp.179-186
• /
• 2015

In this study, the actual energy consumption of the secondary side District Heating System (DHS) with different hot water supply temperature control methods is compared. The two methods are Outdoor Temperature Reset Control and Outdoor Temperature Predictive Control. While Outdoor Temperature Reset Control has been widely used for energy savings of the secondary side system, the results show that the Outdoor Temperature Predictive Control method saves more energy. In general, the Outdoor Temperature Predictive Control method lowers the supply temperature of hot water, and it reduces standby losses and increases the overall heat transfer value of heated spaces due to more flow into the space. During actual energy consumption monitoring, the Outdoor Temperature predictive Control method saves about 6.6% of energy when compared to the Outdoor Temperature Reset Control method. Also, it is found that at partial load condition, such as during daytime, the fluctuation of hot water supply temperature with Outdoor Temperature Reset Control is more severe than that with Outdoor Temperature Predictive Control. Thus, it proves that Outdoor Temperature Predictive Control is more stable even at partial load conditions.

• 한국멀티미디어학회논문지
• /
• 제18권11호
• /
• pp.1367-1374
• /
• 2015

In this paper, we propose a model which can prioritize the performance improvement work by analyzing the major risks and their influence, which can cause performance degradation in the system and show an example of a performance improvement using this model. In presentation-tier, as a result of log data analysis before and after the performance improvement of key processes which handle financial transactions, this model brought the CPU utilization and memory enhancement in the performance improvement work of the financial system which was carried out by applying the proposed model. It has been confirmed that the entire end-user can be accommodated. In the web-tier, the available memory increased by 200MB and we were able to improve the server restart(Recycling) that was sustained in the existing system. In the business logic-tier, we have been able to see better figures after performance improvements through the graph which analyzes the log collected with the key performance counters such as CPU%, Batch Requests/sec. In the data-tier, it has been confirmed that CPU usage and standby operation were reduced and the throughput was found to increase.

• 한국정보통신학회:학술대회논문집
• /
• 한국정보통신학회 2018년도 춘계학술대회
• /
• pp.410-411
• /
• 2018

본 논문에서는 스마트 OBD2단자는 차량에서 OBD2데이터를 수집하여, 스마트 폰 블루투스를 이용하여 전송합니다. OBD2시스템은 SmartPhone에서 사용하는 다양한 서비스를 사용하는 시스템이며, 근거리 무선 통신을 활용하여 사용자를 돕고 블루투스 페어링을 쉽게 구성할 수 있다. 또한 블루투스 4.0을 사용하면 Bluetooth의 호환성이 극대화되고 OBD2단자는 차량 가동 문제 발생을 방지하기 위해 단자의 대기 전력을 최소화한다. 누구나 DB2를 만들어 ODB2데이터를 개발하고 전달할 수 있는 인터페이스를 제공함으로써 OBD2 연결할 수 있도록 한다.

• 한국산학기술학회논문지
• /
• 제15권8호
• /
• pp.5201-5206
• /
• 2014

본 논문에서는 블루투스 통신이 가능한 스마트 전등 스위치를 이용하여 안드로이드 스마트 폰을 이용한 전등 스위치 원격 제어를 구현 하였다. 스마트 전등 스위치는 임베디드 보드와 무선 통신을 이용하여 데이터를 송/수신하여 임베디드 보드에서 데이터를 종합 수집, 가공 하여 이 데이터를 다시 스마트폰과 무선통신을 이용하여 데이터를 송/수신 한다. 임베디드 보드를 게이트웨이로 이용함으로써 추후 추가 될 수 있는 센서들의 유연성을 보장 하였다. 이는 현재 신축 아파트 및 건물에서 서비스 중인 기능이지만, 이를 지원하지 않는 기존 가정에서도 스위치만 교환하여 사용이 가능하므로 사용자의 편의성과 시스템의 유연성을 보장한다.

• 한국멀티미디어학회논문지
• /
• 제19권8호
• /
• pp.1471-1478
• /
• 2016

In this study, the system to manage the power automatically was implemented by using Arduino, Raspberry pi, and Beacon technologies. Before the research, pre-research was carried out with the analysis on the existing power management systems in the market in order to find a solution to reduce burdens from standby power and power waste with the increase of electric charges. The system is designed to be able to deliver and receive data through IEEE 802.15.4 wireless protocol, by using Xbee module. Arduino was tested to verify whether it is able to control SSR(Solid State Relay), and it was found that there is no problem. Meanwhile, it was also tested whether it is possible to organize a star topology network through Arduino and Raspberry Pi, and it was confirmed that normal wireless communication is possible through IEEE 802.15.4 wireless protocol. It is designed that the signal from Android smartphone application is to be delivered to Raspberry Pi and then, to be delivered to Arduino through Xbee so that Arduino could control SSR. In addition to this, wireless protocol required to control Arduino with Raspberry Pi is also designed and applied to this research.

• 한국군사과학기술학회지
• /
• 제25권5호
• /
• pp.513-521
• /
• 2022

This study deals with an AI architecture model for collecting battlefield data using the tactical C4I system. Based on this model, the artificial staff can be utilized in tactical echelon. In the current structure of the Army's tactical C4I system, Servers are operated by brigade level and above and divided into an active and a standby server. In this C4I system structure, the AI server must also be installed in each unit and must be switched when the C4I server is switched. The tactical C4I system operates a server(DB) for each unit, so data matching is partially delayed or some data is not matched in the inter-working process between servers. To solve these issues, this study presents an operation concept so that all of alternate server can be integrated based on virtualization technology, which is used as an source data for AI Meta DB. In doing so, this study can provide criteria for the AI architectural model of the ground tactical echelon.

• 대한전자공학회논문지SD
• /
• 제42권2호
• /
• pp.23-30
• /
• 2005

이 논문에서는 낮은 stand-by power 및 DLL의 재동작 후 fast relocking 구조를 가지는 저전력, 고속 VISI 칩용 DLL(지연 고정 루프) 기반의 다중 클락 발생기를 제안하였다. 제안된 구조는 주파수 곱셈기를 이용하여 주파수 체배가 가능하며 시스템 클락의 듀티비에 상관없이 항상 50:50 듀티비를 위한 Duty-Cycle Correction 구조를 가지고 있다. 또한 DAC를 이용한 디지털 컨트롤 구조를 클락 시스템이 standby-mode에서 operation-mode 전환 후 빠른 relocking 동작을 보장하고 아날로그 locking 정보를 레지스터에 디지털 코드로 저장하기 위해 사용하였다. 클락 multiplication을 위한 주파수 곱셈기 구조로는 multiphase를 이용한 feed-forward duty correction 구조를 이용하여 지연 시간 없이 phase mixing으로 출력 클락의 duty error를 보정하도록 설계하였다. 본 논문에서 제안된 DLL 기반 다중 클락 발생기는 I/O 데이터 통신을 위한 외부 클락의 동기 클락과 여러 IP들을 위한 고속 및 저속 동작의 다중 클락을 제공한다. 제안된 DLL기반의 다중 클락 발생기는 $0.35-{\mu}m$ CMOS 공정으로 $1796{\mu}m\times654{\mu}m$ 면적을 가지며 동작 전압 2.3v에서 $75MHz\~550MHz$ lock 범위와 800 MHz의 최대 multiplication 주파수를 가지고 20psec 이하의 static skew를 가지도록 설계되었다.

• JSTS:Journal of Semiconductor Technology and Science
• /
• 제1권1호
• /
• pp.15-19
• /
• 2001

Current leakage is the major failure mode of semiconductor device characteristic failures. Conventionally, failures such as short circuit breaks and gate breakdowns have been analyzed and the detected causes have been reflected in the fabrication process. By using a wafer-level emission-leakage failure analysis method (in-line QC), we analyzed leakage mode failure, which is the major failure detected during the probe inspection process for LSIs, typically DRAMs and CMOS logic LSIs. We have thus developed a new technique that copes with the critical structural failures and random failures that directly affect probe yields.

• 전력전자학회:학술대회논문집
• /
• 전력전자학회 2013년도 추계학술대회 논문집
• /
• pp.218-219
• /
• 2013

본 논문은 가정용 전기기기의 대기전력을 보상하기 위해 에너지 하베스팅 시스템을 제안한다. 제안하는 에너지 하베스팅 방법을 주요 가전기기에 적용하여 각각의 사용 패턴 및 환경에 따른 발전량을 계산하고, 발전량과 대기전력을 고려하여 주요 가전기기에 전력을 공급하는 배터리가 포함된 전체 시스템을 구성한다. 이를 토대로 대기 전력량과 가전기기에 공급되는 전력량을 비교하여 제안하는 시스템의 타당성을 검증한다.