• Journal of the Korean Institute of Telematics and Electronics
• /
• v.24 no.4
• /
• pp.603-609
• /
• 1987

In this paper, the single-row routing algorithm for munimizing the street congestion and reducing the between node congestion is deviced. To reduce the between node congestion, reference line crossing is defined and used. Reducing the number of total reference line crossing means reducing the total length which help reduce the power consumption of the integrated system and reducing the between node congestin which help reduce the wiring area. This algorithm has been implemented and tested with various example, then produced good results.

• Proceedings of the Korea Contents Association Conference
• /
• 2014.11a
• /
• pp.259-260
• /
• 2014

본 논문은 편의점, 까페 등의 창업시 많은 후보군들 사이에서 적절한 위치를 추천하는 서비스를 만들어보고자 수행되었다. 본 연구는 Skyline Query를 이용하여 사용자가 설정한 지점으로부터의 거리에 따른 예상이익을 도출해내고, MapReduce를 사용하여 많은 후보군들을 대상으로 이를 효율적으로 처리하도록 구현하였다. 본 연구의 방법을 사용하여 창업자가 설정한 한정적 자원 및 거리 제한 조건 안에서 최적의 위치를 손쉽게 추천해줄 수 있을 것이다.

• Proceedings of the Computational Structural Engineering Institute Conference
• /
• 1993.04a
• /
• pp.95-99
• /
• 1993

Conventional tuned mass dampers are located on the top floor of tall buildings, which reduce the fundamental mode response of buildings. Higher modes may have a greater contribution toward the acceleration response of tall buildings. To reduce this, additional tuned mass dampers are required and could be substituted as building equipments. This paper shows, with a numerical ezample, how the lecate tuned mass damper in order to reduce the higher mode response effectively

• Proceedings of the KAIS Fall Conference
• /
• 2010.05a
• /
• pp.269-272
• /
• 2010

In this paper, we propose the computation reduction methods of delta pitch search that is used in G.723.1 vocoder. In order to decrease the computational amount in delta pitch search the characteristic of proposed algorithms is as the following. First, scheme to reduce the computation amount in delta pitch search uses NAMDF. Developed the second scheme is the skipping technique of lags in pitch searching by using the threshold value. By doing so, we can reduce the computational amount of pitch searching more than 64% with negligible quality degradation.

• Proceedings of the Korean Information Science Society Conference
• /
• 2012.06a
• /
• pp.24-26
• /
• 2012

하드웨어 컴퓨팅 자원의 성능을 최대로 활용하기 위한 소프트웨어 기술로 가상 머신 기술이 활발하게 사용되고 있다. 또, 하드웨어 컴퓨팅 자원의 병렬성을 극대화하기 위한 소프트웨어 기술로 함께 주목 받고 있는 기술이 분산 병렬 프로그래밍 기술이다. 그러나 가상머신에서 데이터를 병렬로 처리할 경우 I/O의 속도 저하 문제 등과 같은 단점이 있다. 본 논문에서는 성능 저하 없이 가상 머신에서 병렬 프로그래밍을 수행할 수 있도록 가상 머신에서의 태스크 개수 결정을 위한 선행 연구로서, 가상 머신 환경을 만들고, 여러 가지 속성 값을 변경하여 MapReduce 성능 평가결과를 보인다. 본 논문에서 수행한 실험의 결과는 가상머신에서의 MapReduce 태스크 결정 방법으로 연구에 참고자료로 사용될 수 있을 것이다.

• Journal of the Korean Data and Information Science Society
• /
• v.24 no.5
• /
• pp.1013-1027
• /
• 2013

As the need for large-scale data analysis is rapidly increasing, Hadoop, or the platform that realizes large-scale data processing, and MapReduce, or the internal computational model of Hadoop, are receiving great attention. This paper reviews the basic concepts of Hadoop and MapReduce necessary for data analysts who are familiar with statistical programming, through examples that combine the R programming language and Hadoop.

• ETRI Journal
• /
• v.37 no.2
• /
• pp.317-327
• /
• 2015

A reliable analysis of consumer preference from a large amount of purchase data acquired in real time and an accurate customer characterization technique are essential for successful direct marketing campaigns. In this study, an optimal segmentation of post office customers in Korea is performed using a subspace projection-based clustering method to generate an accurate customer characterization from a high-dimensional census dataset. Moreover, a traditional temporal mining method is extended to an algorithm using the MapReduce framework for a consumer preference analysis. The experimental results show that it is possible to use parallel mining through a MapReduce-based algorithm and that the execution time of the algorithm is faster than that of a traditional method.

• 제어로봇시스템학회:학술대회논문집
• /
• 1997.10a
• /
• pp.1884-1887
• /
• 1997

The increasing concern over radiation exposure in the nuclear industry has fostered agrressive efforts to reduce the levels of radiation exposure. One area of the effot to reduce the radiation exposure is the development of a remote radiation monitoring system. Remote radiation monitoring can serve many benificaial functions reduce exposure to radiation by plant personnel, impruve the quality of the data that is collected and recognize the radiation environment easily. Radiation mapping system gives a good information that represents radiation level distribution. The system we have developed consists of a data acquistion parts, mobile robot and remote control parts. Data acquisition parts consist of radiation detection module and vision acquistion module which collect radiation data, visiion data and distance information. In remote control parts, the acquision data are processed and displayed. We have constructed radiation mapping image by overlaying the vision and radiation data. The radiation mapping techniques for displaying the results of the survey in an easily comprehendable form will facilitate a better understanding of the radiation environment in the facility. This system can reduce workers radiation exposure and aid to help work plan, so it has significant benifits in cost and safety.

• Proceedings of the Acoustical Society of Korea Conference
• /
• 1994.06c
• /
• pp.214-217
• /
• 1994

The major drawback in the Code Excited Linear Prediction type vocoders is their large computational requirements. In this paper, a simple method is proposed to reduce the pitch searching time in the pitch filter almost without degradation of quality. On the basis of the observational regularity of the correlation function of speech, only the limited numbers of pitch lags are considered to be an optimum pitch. This is done by skipping the negative envelope side of the correlation function and limiting the maximum number of lags to be considered preliminarily. By doing so, we can reduce the computational time of pitch searching more than 51% with negligible quality degradation. In addition to that, by combining that method with the conventional delta search technique, we can reduce the computational time requirements more than 60% without serious lowering the speech quality in segmental SNR measure compared to the conventional full search method.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
• /
• 2002.04a
• /
• pp.206-208
• /
• 2002

Metalworking fluids (MWFs) are fluids used during machining and grinding to prolong the life of the tool , carry away debris, and protect the surfaces of work pieces. These fluids reduce friction between the cutting tool and the work surface, reduce wear and galling, Protect surface characteristics, reduce surface adhesion or welding and carry away generated heat. Workers can be exposed to MWFs by inhaling aerosols (mists) and by skin contact with the fluid. Skin contact occurs by dipping the hands into the fluid, splashes, or handling workpieces coated with the fluids. The amount of mist generated (and the result ins level of exposure) depends on many factors. To reduce the potential health risks associated with occupational exposures to MWFs, it is required to establish optimum MWFs supply method and condition with minimum Quantity in all over the mechanical machining field including high speed type heavy cult ing process.