• Proceedings of the Korea Information Processing Society Conference
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• 2007.11a
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• pp.247-249
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• 2007

데이터 마이닝은 데이터 속에 숨겨져 있는 의미 있는 패턴을 찾아내는 것이다. 이러한 패턴들을 찾아내는 것은 데이터 마이닝에서 중요한 부분을 차지한다. 그러나 기존의 데이터 마이닝 방법들에 사용되는 데이터는 시간의 흐름에 데이터가 변하지 않는다는 특징을 가지고 있다. 시간의 흐름에 따라 변화하는 데이터의 특성을 고려해볼 때 변하지 않는 데이터에서 패턴을 찾아내는 것은 의미가 없는 일이다. 따라서 실시간으로 변하는 데이터의 특성을 고려하고 더불어 적합한 실시간 침입 탐지 방법이 필요하다. 따라서, 본 연구에서는 시간의 흐름에 따라 변하는 데이터에서 규칙을 발견하여 규칙 Set 을 생성하는 실시간 데이터 마이닝 기법을 이용하여 시간의 흐름에 따라 변하는 데이터에 대한 침입을 감시하기 위해 실시간 침입 탐지 시스템에 적용함으로써 보다 효율적으로 침입을 탐지하기 위한 방법을 제시한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2024.05a
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• pp.862-863
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• 2024

기존의 딥러닝 모델을 활용한 얼굴 탐지 시스템은 영상을 처리할 때 이미지의 양이 과도하여 추론 속도가 영상 재생 속도보다 느려지게 되고, 이로 인해 지연 현상이 발생한다. 본 논문은 이미지 크기 조정 및 광학 흐름을 활용하여 얼굴 탐지에 필요한 추론량을 줄이는 기법을 제안한다. 제안된 기법은 세 단계의 처리 과정으로 구성된다. 첫 번째 단계에서는 프레임의 크기를 줄여 프레임 처리 속도를 효과적으로 향상시킨다. 두 번째 단계에서는 비탐지 구간이 아닌 프레임만을 배치 처리하여 딥러닝 모델로 추론하여 처리 시간을 단축시킨다. 세 번째 단계에서는 광학 흐름 알고리즘을 이용하여 비탐지 구간에서 얼굴 추적을 함으로써 정확도는 유지하면서 탐지 시간을 단축한다. 본 논문에서 제안하는 이미지 크기 조정 및 광학 흐름 알고리즘 기반 얼굴 탐지 시스템은 처리 시간을 수십 배 이상 단축하여 영상에서의 얼굴 탐지에 있어서 우수한 성능을 입증하였다.

• The Korean Publising Journal, Monthly
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• s.226
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• pp.10-10
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• 1997

현실문제에 고민하는 이들은 사회학이 현실을 이해하는 데 도움을 주길 원한다. 이런 고민은 정보사회에 대한 낙관적 흐름과 생태학적 위험, 경제적 위기에 대한 비관적 흐름에 관심을 갖게 한다.

• The KIPS Transactions:PartA
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• v.9A no.2
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• pp.171-180
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• 2002

The effective and accurate data flow problem analysis uses the dominator tree and DJ graphs. The data flow problem solving is to safely reduce the flow graph to the dominator tree. The flow graph replaces a parse tree and used to accurately reduce either reducible or irreducible flow graph to the dominator tree. In this paper, in order to utilize Tarian's path compress algorithm, the Top node finding algorithm is suggested and the existing delay reduction algorithm is improved using Path compression. The delayed reduction a1gorithm using path compression actually compresses the pathway of the dominator tree by hoisting the node while reducing to delay the DJ graph. Realty, the suggested algorithm had hoisted nodes in 22% and had compressed path in 20%. The compressed dominator tree makes it possible to analyze the effective data flow analysis and brings the improved effect for the complexity of code optimization process with the node hoisting effect of code optimization process.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2018.10a
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• pp.582-585
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• 2018

As traffic volume increases and road networks become more complicated, identifying for accurate traffic flow and driving smooth traffic flow are a concern of many countries. There are various analytical techniques and studies which desire to study about effective traffic flow. However, the necessary activity is finding the traffic flow pattern through data visualization including location information. In this paper aim to study a real-world urban traffic trajectory and visualize a pattern of traffic flow with a simulation tool. Our experiment is installing the sensor module in 40 taxis and our dataset is generated along 24 hours and unscheduled routes. After pre-processing data, we improved an open source traffic visualize tools to suitable for our experiment. Then we simulate our vehicle trajectory data with a dots animation over a period of time, which allows clearly view a traffic flow simulation and a understand the direction of movement of the vehicle or route pattern. In addition we further propose some novel timelines to show spatial-temporal features to improve an urban environment due to the traffic flow.

• Journal of Korean Electronics
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• v.15 no.4
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• pp.58-60
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• 1995

• 정보화사회
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• s.6
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• pp.50-55
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• 1988

• 발명특허
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• v.10 no.1 s.107
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• pp.34-38
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• 1985

• Archives of design research
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• v.11 no.3
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• pp.187-196
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• 1998

This study is intended to suggest the method of text arrangement in order to enhance visual perception which would help darify its communication. One hundred subjects without restriction of gender and profession participated in each experiment :their reading time was measured by the 0.01 second. The Analysis of Variance(two-way ANOVA without interaction) was performed for each experiment and the p value was 0.0001 which implies that there was a strong consistency among test results. Based on the first results, it is found that there is a consistent relationship between type size and text line length, and the following discovery was made ; the most effective ratio of type size to line length is approximately 1 :8. Judging from the Second and Third results, it seems that the vertical text arrangement is most efficient for reading regardless of text line length. So to make same rreading direction is more important than to narrow down the eye moving distance between column and column for efficient visual flow. This research supports the view that considering efficient eye movement on text, it is important to understand the mentioned variables that affect visual interpretation.

• Journal of KIISE:Information Networking
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• v.33 no.5
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• pp.355-368
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• 2006

This paper introduces a new split-TCP approach for improving TCP performance over IEEE 802.11-based wireless LANs. TCP over wireless LANs differently from wired networks is not aggressive, which is a fundamental reason for poor performance. Therefore, we propose TAS (TCP-Aware Sub-layer) to migigate this problem. Our scheme extends the split-connection approach that divides a connection into two different connections at a split point such as an access point (AP). Using TAS, a wireless node emulates TCP ACK packets using MAC ACK frames, instead of receiving real TCP ACK packets. We compared TAS with both normal TCP and I-TCP (Indirect TCP) by NS2 simulation. Results show that TAS achieves higher throughput, more fair resource allocation and, in power-saving mode, shorter delays.