• Journal of the Korea Society of Computer and Information
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• v.16 no.2
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• pp.9-16
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• 2011

GPU computing is emerging in high performance application area since it can easily exploit massive parallelism in a way of cost-effective computing. The power method which finds the eigen vector of a given matrix is widely used in various applications such as PageRank for calculating importance of web pages. In this research we made the power method efficiently parallelized on GPU and also suggested how it can be improved to enhance its performance. The power method mainly consists of matrix-vector product and it can be easily parallelized. However, it should decide the convergence of the eigen vector and need scaling of the vector subsequently. Such operations incur several calls to GPU kernels and data movement between host and GPU memories. We improved the performance of the power method by means of reduced calls to GPU kernels, optimized thread allocation and enhanced decision operation for the convergence.

• Journal of Internet Computing and Services
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• v.3 no.6
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• pp.43-51
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• 2002

In this paper, we study the new packet dropping scheme using an active queue management algorithm. Active queue management mechanisms differ from the traditional drop tail mechanism in that in a drop tail queue packets are dropped when the buffer overflows, while in active queue management mechanisms, packets may be dropped early before congestion occurs, However, it still incurs high packet loss ratio when the buffer size is not large enough, By detecting congestion and notifying only a randomly selected fraction of connection, RED causes to the global synchronization and fairness problem. And also, it is the biggest problem that the network traffic characteristics need to be known in order to find the optimum average queue length, We propose a new efficient packet dropping method based on the active queue management for congestion control. The proposed scheme uses the per-flow rate and fair share rate estimates. To this end, we present the estimation algorithm to compute the flow arrival rate and the link fair rate, We shows the proposed method improves the network performance because the traffic generated can not cause rapid fluctuations in queue lengths which result in packet loss

• Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
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• 2000.11a
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• pp.54-54
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• 2000

종이의 생산성을 향상 시키기 위한 방법에는 초지기의 광폭화오} 생산 속도의 증가 가 있다. 현재 초지기는 10m까지 생산 폭이 확대 되었고, 생산 속도에 있어서는 최 신 설비의 경우 2,OOOm/min로 설계 되고 있다. 따라서 생산 폭과 속도의 증가는 이 전의 소폭과 저속의 생산 셜비에서와 동일한 원료 배합과 생산 관리로는 최적의 생 산 효율을 달성하는데 문제점이 있다. 그러므로 현재 각국의 신규 제지 설비에 적 용되 고 있는 twin wire system역 시 생 산 속도의 증가를 극복하고 기 존의 fourdrinier s system 이 지니고 있는 문제점을 극복하기 위해 도입되었다. 두 가지의 생산 설비에서 제조된 종이의 가장 큰 차이점은 미세 입자들의 분포와 종이의 구조적 특성에 있다. 특히 fourdrinier system에서 미세 입자들의 분포는 횡단 면을 기준으로 볼 때 표면에서 와이어 면으로 진행됨에 따라 급격히 감소된다는 것 을 알 수 있다. 이러한 사실은 주지하는 바와 같이 초지 형성부에서 효과적인 탈수 를 달성하기 위해 부착되어 있는 여러가지 탈수 장치들의 영향으로 와이어 방향으 로만 급격한 탈수가 일어나기 때문이다. 그러나 twin wire system 2.! gap former어$\mid$ 있 어서 미세 섬유와 충전제가 횡단면상에서 분포하는 형태는 "U"자 형태로 상면과 하 면에서 가장 높은 미세분의 분포를 나타내고 줄간층에는 상대적으로 낮은 미세분이 분포하고 있을을 알수 있다. 따라서 종이의 중간층 미세분 분포의 감소는 섬유간 표면적의 감소를 의미하고 이로 인하여 결합력이 약해진다는 것을 알 수 있다. 특 히 도공 원지로 사용되었을 경우 heat off-set 인쇄시 블리스터와 같은 문제점을 일 으키기도 한다. 앞서 언급한 바와 같이 종이의 제조 설비에 따라 제조되는 종이의 구조적 특성이 변하게 되므로 동일한 도공 공정에 적용 되었을 경우 이들로부터 제 조된 도공지의 특성에도 영향을 미칠것으로 예측된다. 따라서 본 연구에서는 두 가지 초지기의 형태에서 제조된 원지가 도공 작업성과 도공지의 특성에 미치는 영향에 대해 고찰코자 하였다.대해 고찰코자 하였다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.14 no.5
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• pp.153-159
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• 2014

In this paper, we propose the Distributed Power Saving Control System that enables the active and intelligent control(on/off and/or dimming control) of the lightning device using sensors and mobile agents. The proposed system is effective for energy saving and induces cost reductions in design and development of power saving control system as adding remote-monitoring or controlling functions is easier with the application of a variety of active rules. Moreover, the system improves the effectiveness of the acquired sensing data by real-time event handling and device controlling using a mobile agent based sensor network middleware that regularize the contextual information or a user's emotion. The results of this paper present the potential applicability of the proposed distributed control system using mobile agent in various active sensor network applications.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.43 no.1 s.343
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• pp.25-32
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• 2006

We propose a new M-ary state-transition FSK modulator technique for enhancing demodulator's symbol timing recovery which can be applied to acoustic MODEM. In the previous technique, the demodulator's symbol timing performance can degrade when the sequences of same symbols are transmitted. This proposed method, because the transmission symbol changes in every single symbol period, increases the synchronization performance dramatically and has a simple MODEM and frame structure. On the one hand, we improve modulation-derived synchronization(MDS) which is M-ary FSK's symbol timing recovery scheme, then analyze it. Finally the proposed method is analyzed from the viewpoint of frequency efficiency, which proves this method is appropriate for acoustic MODEM.

• Journal of the Institute of Electronics Engineers of Korea TE
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• v.42 no.1
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• pp.35-40
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• 2005

Recently, the location based service for moving customers is becoming one of the most important service in mobile communication area and for moving object applications, there are lots of update operations and such update loads are concentrated on some particular area unevenly. The primary processing of LBS application is spatio-temporal range queries and to improve the throughput of spatio-temporal range queries, the time of disk I/O in query processing should be reduced. In this paper, we adopt non-uniform two-level grid index structure, which are designed to minimize update operations. We propose query scheduling technique using spatial relationship and time relationship and a combined spatio-temporal query processing method using time zone concepts to improve the throughput of query processing. Some experimental results are shown for range queries with different query range to show the performance tradeoffs of the proposed methods.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.45 no.6
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• pp.106-113
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• 2008

In this paper, we propose an Entropy-based Cooperative-Aided Routing Protocol (ECARP) in Mobile Ad-hoc fireless Sensor Networks (MAWSN). The main contributions and features of this paper are as follows. First, the entropy-based cooperative routing protocol which is based on node mobility is proposed for supporting stable routing route construction. Second, cooperative data transmission method is used for improving data transmission ratio with the improved SNR. Third, we consider a realistic approach, in the points of view of the MAWSN, based on mobile sensor nodes as well as fixed sensor nodes in sensor fields while the conventional research for sensor networks focus on mainly fixed sensor nodes. The performance evaluation of the proposed routing protocol is performed via simulation and analysis.

• The Journal of Information Technology
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• v.5 no.3
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• pp.81-96
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• 2002

Recently business reengineering is the most attractive management reforming skill. Many of the Korean firms are paying attention to business reengineering and many of them have initiated it. The major purposes of this study are; (1) to investigate the relationship between each variable and success or failure of business reengineering, and (2) to examine interaction effects of measurement and performation variables. Two hundred eighteen questionaires were used for analysis. In order to throughout studies that I executed earlier. To look for dependence of critical success factors on analysis was performed to examine patterns between measurement and performance variables. In conclusion, the hypothesized relationships in the research model are supported by the empirical findings of this study. Additionally it is possible to establish theoretical reference system on the basis of critical success factors.

• Culinary science and hospitality research
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• v.16 no.3
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• pp.161-173
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• 2010

The foodservice industry should be customer-oriented and service-oriented because production and consumption occur simultaneously and sales depend on customers' participation in the foodservice industry. In this respect, it is faced with maintaining minimum human resources with efficient management systems and policies which employees can offer quality services. This study, therefore, aims to find out how internal marketing strategies affect conflict perception. The result of the study is as follows. Communication, service training, employee benefits and a reward system are generally important in the internal marketing. In particular, it is considered that employee benefits and a reward system based on finance are more important to employees than any other factor. Accordingly, companies should consider facilities offered to the employees, vacation and employee benefits. Also, it is shown that communication-obstacles take high proportion in the cause of conflicts and employee benefits in the internal marketing. This study showed the possibility of internal marketing used as a management method of human resources and a solution for resolving conflicts.

• Journal of Korean Society for Geospatial Information Science
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• v.15 no.4
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• pp.21-29
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• 2007

The National Geographic Information Clearinghouse (NGIC) in Korea has been established to share dispersed geographic information in many government organizations. The NGIC has become a main hub for sharing and exchanging geographic information in Korea. However, due to rapid technological advancement, citizens not only require more information but also demand more functions for NGIC. In this regards, this research tries to find the way of developing NGIC from a means of 'information sharing' to an arena of 'information use'. To do so, it suggests new technical frameworks and functionalities for NGIC. Then it recommend policy measures to improve current NGIC.