• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.5
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• pp.2594-2602
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• 2014

As environmental awareness increases, regulations on exhaust gas of automobile, which is a cause of air pollution, have been strengthened. In order to meet emission regulation, automobile companies and engine manufacturers have actively developed the related technologies. Because the emission control has become severe, the systems using electronic motor or solenoid valve for high precise control are needed. For this reason, it is required not only the optimization of composition of components for improving performance and efficiency of the system but also the development of optimal design technology of electronic control system by securing the designing and manufacturing technology of the components. In this paper, it is proposed the position characteristics for electronic EGR valve module through the applied control logic and experiment results.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.9
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• pp.732-736
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• 2016

Air conditioning part designs are moving towards higher efficiency and productivity. The expansion device is one of the core parts of an air conditioning system and controls the refrigerant quantity, evaporation load, compression capacity, and condensation capacity. In this study, an electronic expansion valve for two working fluids ($CO_2$ and R134a) was developed for air conditioning systems in vehicles. The valve uses an eccentric cam driving structure instead of a lead screw to decrease manufacturing costs and increase productivity. The pressure resistance and flow rate performance was evaluated using numerical analysis. At maximum operation conditions and burst pressure conditions with $CO_2$, the maximum stresses on the valve model were about 98 MPa and 223 MPa, respectively. The maximum flow rates of $CO_2$ and R134a with different orifice openings were about 550 kg/h and 386 kg/h, respectively. The performance with R134a was verified by experiments.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.4
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• pp.700-710
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• 2017

In the revision of the national curriculum, various creative activities and career activities are highlighted under the goal of fostering creative talent. Following the implementation of this policy, which is represented by creative activities, teachers are burdened with comprehensive responsibilities, such as planning and executing safety procedures and preventing accidents. Existing systems for teacher management had limitations that allowed only the provision of standardized information and management. The main purpose of this study is to help teachers manage their classes systematically through a class management system. The teachers' overall management system includes several functions, such as checking students' locations, registering students' reviews, or registering various kinds of activities for the creative experiential activities of the curriculum. This system not only helps teachers to systematically manage the creative experiential activities, but also allows teachers to share the history of their activities with each other. Furthermore, this system will be helpful in achieving the objectives of the revised curriculum.

• Journal of Korea Multimedia Society
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• v.6 no.2
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• pp.267-275
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• 2003

The development of the mobile communication has been enlarged gradually and has been changed voice centered services into data centered ones supporting Internet to provide various kinds of mobile internet services. Researches for data transmission have been achieved actively lot the effective approachment of web in the mobile terminal. The users using mobile communication are increasing for its easy handcarried and movement and the information in internet based upon wire communication has been changed into mobile communication fast. The development of mobile internet requires various mobile contents using mobile internet at any time and at any place due to rapid enhance of network capacity and mobile internet according to network expansion. To accept these needs, there are many difficult problems that contents must be remade according to various terminal features and the develoument costs much. To solve these problems, this paper has the pun)me that contents of Web documents are changed and processed through XML palter and design new mobile contents system, providing mobile services rapidly and obtaining the charge reduction result with the enhance of contents development to the shortening of a development Period.

• Journal of the Institute of Convergence Signal Processing
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• v.13 no.2
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• pp.83-90
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• 2012

In this paper, an intelligent visual surveillance system based on a NIOS II embedded platform is implemented. By this time, embedded based visual surveillance systems were restricted for a special purpose because of high dependence upon hardware. In order to improve the restriction, we implement a flexible embedded platform, which is available for various purpose of applications. For high speed processing of software based programming, we improved performance of the system which is integrated the SOPC type of NIOS II embedded processor and image processing algorithms by using software programming and C2H(The Altera NIOS II C-To-Hardware(C2H) Acceleration Compiler) compiler in the core of the hardware platform. Then, we constructed a server system which globally manage some devices by the NIOS II embedded processor platform, and included the control function on networks to increase efficiency for user. We tested and evaluated our system at the designated region for visual surveillance.

• Journal of the Korean Institute of Intelligent Systems
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• v.19 no.5
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• pp.730-736
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• 2009

It is more important to analysis of huge gemonics data in Bioinformatics. Here we present a novel datamining approach to predict structure and function using protein's primnary structure only. We propose not also to develope n-Block substring search algorithm in reducing enormous search space effectively in relation to feature selection, but to formulate weighted linear algorithm in a prediction of structure and function of a protein using primary structure. And we show efficient in protein domain characterization and classification by calculation weight value in determining domain association in each selected substring, and also reveal that more efficient results are acquired through claculated model score result in an inference about degree of association with each CDS(coding sequence) in domain.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.7 no.4
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• pp.107-117
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• 2008

OBE(On Board Equipment) of IR(Infrared)/RF(Radio Frequence)-DSRC(Dedicated Short Range Communication) are set up 1.25 million cars because Korea Highway Cooperation supplied in HiPass(Domestic Electronic Toll Collection System). But this DSRC system has strength and weakness of service for BIS(Bus Information System) or UTIS(Urban Traffic Information System) because BIS and UTIS are required vary high communication's performance and management. In this paper, Efficiency of IR/RF-DSRC is analyzed performance of MAC(Medium Access Control) by computer simulation for services of BIS or UTIS, so Suggested to be commensurated with medium of there service. Specially, DSRC is needed high mobility and throughput in the vary short communication range, so Analysed the transmission rate of data in each communication medium over the specific character of the MAC frame.

• Proceedings of the Korea Water Resources Association Conference
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• 2011.05a
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• pp.429-429
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• 2011

우리나라는 연중 강우량의 계절적 편중이 심하여 약 2/3이 6월-9월에 집중하는 기상학적 요인과, 국토의 약 70%가 산악지역으로 되어있는 지형학적 요인 등 홍수에 취약한 자연특성을 갖고 있으며, 특히 하천, 도시 저지대, 해안 및 산지에서는 홍수범람, 내부배제 불량, 해일, 산사태 등으로 매년 많은 인명피해와 재산상의 손실이 크게 발생하고 있다. 또한 최근 발생하고 있는 이상기후 현상과 각종 개발사업으로 인한 불투수면적의 증가 등으로 인해서 극한 홍수의 발생빈도가 높아가고 있으나, 기존 수방시설물의 홍수배제능력 부족 등으로 매년 많은 피해를 입고 있는 실정으로, 구조적인 대책만으로는 재해피해를 경감시키는데 한계가 있음을 인식하여 구조적 대책과 더불어 토지이용규제 및 개발규제, 홍수터관리, 홍수예경보 등 비구조적 재해대 비능력 향상이 시급한 현황이다. 우리나라의 경우, 구조적 수방기술의 발전은 비교적 높은 수준에 도달해 있지만, 구조적 대책에 비해 비구조적 대책의 개발 및 적용은 미흡한 형편이므로, 비구조적 홍수대책의 종합적 정비 및 효율적 운영방법 필요하다. 따라서 본 연구에서는 홍수유형별 발생원인별 대표적인 비구조적 홍수대책을 국내외 적용사례를 조사하여 분석하고, 비구조적인 홍수방어대책들에 대한 장단점 및 적용성 등의 정성적 평가를 실시하였다. 국내 여건에 적합한 홍수위험구역 설정방안을 제시하고자, 국내의 다양한 하천공간 확보를 위한 관련규정인 하천구역, 홍수관리구역, 수변구역, 상수원보호구역, 친수구역, 홍수위험구역, 자연재해위험지구, 방재지구 등에 대하여 조사하였으며, 국외 사례로 영국의 홍수위험구역 평가제도, 미국의 홍수터 관리 프로그램, 호주의 하천공간 분류 기준, 일본의 하천공간 설정 기준 등에 대한 고찰을 수행하였다. 또한 국내 홍수보험 제도의 문제점 분석 및 제고방안을 제시하고자, 현재 소방방재청 주관으로 시행되고 있는 풍수해보험제도에 대한 조사 및 분석을 실시하였으며, 미국에서 시행되고 있는 국가홍수보험프로그램, 프랑스의 자연재해보험, 스위스의 자연재해보험풀 제도, 일본의 홍수보험제도에 대하여 심층적인 고찰을 수행하였다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.12 no.12
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• pp.2179-2187
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• 2008

The P2P technology has been widely used to distribute files efficiently, and its use in streaming is rapidly increasing. P2P streaming has issues about startup-delay, scalability, and real-time playback, however, what affects these factors has not been researched sufficiently. This paper suggests a buffering model for progressive download within mesh-based P2P system, which corresponds to downloading and playing the content at the same time. It is used to analyze PDF(Playback Deadline First), Rarest algorithms which are block-selection strategies of P2P streaming and proposes a mixed selection of them. The mixed block selection strategy dynamically performs different strategies based on whether the blocks to be played are received or not. In consequence, it enhances the QoS of streaming in a single peer point of view, as well as improving block distributions in an overlay network.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.11 no.3
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• pp.592-599
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• 2007

The advancement of wireless technology improves the electronic learning by combining with the mobile function, and promotes the expanded transition to the mobile learning. Basically, the mobile learning provides the usefulness in terms of tile and space to provide learners with the access to the educational contents. However, the small display device and limited memory space of mobile device is limiting the access to the learning contents simply to the text-based transmission. This paper designed and implemented the multimedia mobile learning system that reduces the size of parser by define into MSMIL composed only of needed tag to multimedia contents production in the mobile devices by using the SMIL that supports the multimedia object synchronization reduces the data of multimedia learning data and enhances the transmission efficiency by applying the macro method in creating the contents of learning. The results of implementation indicates that it simplifies the designing language, makes the language learning easy, and saves the CPU resources for the parsing by reducing the size of parser.