• Title/Summary/Keyword: current pattern

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Network Security Situational Awareness using Traffic Pattern-Map (트래픽 패턴-맵을 이용한 네트워크 보안 상황 인지 기술)

  • Chang Beom-Hwan;Na Jung-Chan;Jang Jong-Su
    • Journal of Korea Society of Industrial Information Systems
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    • v.11 no.3
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    • pp.34-39
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    • 2006
  • This paper introduces a network security situation awareness tool using a traffic pattern map which facilitates recognizing a current network status by extracting and analyzing predetermined traffic features and displaying an abnormal or harmful traffic which deteriorates network performance. The traffic pattern-map consists of $26{\times}26$ intersections, on which the occupancy rate of the port having maximum occupancy is displayed as a bar graph. In general, in case of the Internet worm, the source address section on the traffic pattern map is activated. In case of DDoS the destination address section is activated.

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Analysis of Login and Learning Hour in Cyber Classes of Undergraduate Students (학부 사이버강의 수강생들의 로그인과 학습 시간 분석)

  • Moon, Bong-Hee
    • Journal of the Korea Society of Computer and Information
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    • v.12 no.5
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    • pp.171-177
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    • 2007
  • The cyber classes of an e-Learning system have been considered as one of the important form of education. However, there is no or little study of effectiveness and function for the students' position. In this study, I analyzed log files in the e-learning system, and classified login and teaming hour patterns of students, who were enrolled in the undergraduate courses of the university, into hourly pattern in a daily pattern in a week, weekly pattern in a semester. I proposed general ideas to improve effectiveness and function of current e-learning. Over 50% of logins were for less than 30minutes learning and there is wasteful use of e-learning system resources.

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A Study on Improvement of a-Si:H TFT Operating Speed

  • Hur, Chang-Wu
    • Journal of information and communication convergence engineering
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    • v.5 no.1
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    • pp.42-44
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    • 2007
  • The a-Si:H TFTs decreasing parasitic capacitance of source-drain is fabricated on glass. The structure of a-Si:H TFTs is inverted staggered. The gate electrode is formed by patterning with length of $8{\mu}m{\sim}16{\mu}m$ and width of $80{\sim}200{\mu}m$ after depositing with gate electrode (Cr) $1500{\AA}$ under coming 7059 glass substrate. We have fabricated a-SiN:H, conductor, etch-stopper and photoresistor on gate electrode in sequence, respectively. The thickness of these, thin films is formed with a-SiN:H ($2000{\mu}m$), a-Si:H($2000{\mu}m$) and $n^+a-Si:H$ ($500{\mu}m$). We have deposited $n^+a-Si:H$, NPR(Negative Photo Resister) layer after forming pattern of Cr gate electrode by etch-stopper pattern. The NPR layer by inverting pattern of upper gate electrode is patterned and the $n^+a-Si:H$ layer is etched by the NPR pattern. The NPR layer is removed. After Cr layer is deposited and patterned, the source-drain electrode is formed. The a-Si:H TFTs decreasing parasitic capacitance of source-drain show drain current of $8{\mu}A$ at 20 gate voltages, $I_{on}/I_{off}$ ratio of ${\sim}10^8$ and $V_{th}$ of 4 volts.

The Setting in the Range of Traffic Accident on the Crosswalk (횡단보도의 교통사고 범위 설정에 관한 연구)

  • Kim, Jang-Wook;Jung, Min-Young;Kang, Dong-Soo;Hong, Ji-Yeon;Lee, Soo-Beom
    • Journal of the Korean Society of Safety
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    • v.26 no.4
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    • pp.120-126
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    • 2011
  • Under the current law or system, the range of traffic accident on the crosswalk does not reflect the characteristics of traffic accident and the pedestrian's walking pattern. Thus, this study conducted a video recording survey on the 250 spots which are high to traffic accident rate of pedestrian-vehicle to reset the range of traffic accident on or near the crosswalk considering the characteristics of traffic accident and the pedestrian's walking pattern. Based on the collected data through a video recording survey, this study analyzed the pattern of pedestrians and extracted the variables influenced in the pedestrian's walking pattern. After conducting the regression analysis, this study made the model of measuring the range of traffic accident on the crosswalk. Through all processes these, this study reset the range of traffic accident on the crosswalk which could minimize the disadvantages of pedestrian when they have an accident on the crosswalk and ensure the right of way of pedestrian.

Analysis of the Contact Wire Wear Pattern According to the Pre-sag (사전이도에 따른 전차선 마모 패턴 분석)

  • Lee, In-Hee;Park, Jae-Young
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.64 no.10
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    • pp.1501-1507
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    • 2015
  • The contact wire pre-sag in railway overhead catenary has been considered as a innovative idea which improves the current collection quality and is expected to evenly distribute wear along a span. However, long term studies on the effects of pre-sag, especially on the quantitative wear pattern of the contact wire, have not yet been reported. Therefore, in this study, the pre-sag and wear pattern of the contact wire along a span from long term operation of railway in Korea was surveyed. The examination was conducted on 3 lines, the Gyeongbu high-speed line with pre-sag of span/2000, the Gyeongbu existing line without pre-sag, and Gyeongchun line with pre-sag installation on 1/1000 of its span. The wear measurements of 58 sample spans were examined. The wear pattern analysis show no interrelationships between pre-sag and evenly distributed wear, but more wear occurred at the center of a span compared to the ends of the span, especially more noticeable as span length increases.

Fabrication of DLC Micro Pattern Roll Mold by Photolithography Process (포토 리소그래피 공정을 이용한 DLC 마이크로 패턴 원통 금형 제작)

  • Ha, T.G.;Kim, J.W.;Lee, T.D.;Yoon, S.J.;Kim, T.G.
    • Journal of the Korean Society for Heat Treatment
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    • v.31 no.2
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    • pp.63-67
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    • 2018
  • Recent mold industry uses many roll-to-roll processes that can produce high production speed and precision machining and automation process. In the circular cylinder mold, however, patterns of less than $10{\mu}m$ are difficult to manufacture and maintain. In this study, we fabricated a circular cylindrical mold with a DLC thin film which have high hardness, low coefficient of friction and high releasability by using lithography and lift-off process. The height, line width, and pitch of the fabricated DLC macro pattern are $3.1{\mu}m$, $9.1{\mu}m$ and $20.2{\mu}m$, respectively. The pattern size is finer than the current applied to the aluminum cylinder type, and this shows the possibility of practical use of DLC micro pattern roll mold.

Analyzing the Pattern Design of Patient Gowns of Domestic General Hospitals (국내 상급종합병원의 환자복 문양 디자인 현황 분석)

  • Kwon, Jeanne;Yim, Eunhyuk
    • Fashion & Textile Research Journal
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    • v.21 no.4
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    • pp.390-400
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    • 2019
  • A major factor in making current hospital gowns is how to manage patients from the standpoint of hospitals. This shows that hospital gowns have not been considered as an apparel for a specific purpose with a design that considers the psychological composure of patients. This study, along with a meticulous analysis of the pattern design of domestic hospital gown suggests a design philosophy that can be of emotional help to patients. The analysis of hospital gowns in terms of motif is that the corporate identity of the hospital in question, along with the lettering symbolizing the hospital is conspicuous. The motif shown in the pattern also has a brightness contrast and two-way pattern. This study suggests hospital gown patterns as follows. First, on the basis of color dynamics, utilize repetition arrangement, camaieu arrangement and faux camaieu arrangement. Second, make use of warm colors in order to enhance trust between patients and medical staff. Last, use green color as a dominant color for the hospital to be felt of as a convenient space. Utilizing these three factors in the future design of hospital gowns will assist in the development of new hospital gowns that render a psychological composure.

Comparison Among Shoulder Diagonal Pattern of Exercises Considering Phase of Contraction Based on Muscle Activity (상지의 대각선 운동형태와 수축형태에 따른 근활성도 비교연구)

  • Soo-Han Kim;Se-Yeon Park
    • PNF and Movement
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    • v.22 no.1
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    • pp.151-158
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    • 2024
  • Purpose: The present study investigated how variations in diagonal exercises affect shoulder muscle activity, examining changes in neuromuscular activation during scapular and shoulder diagonal patterns of exercises. Furthermore, we explored whether the exercise phase affects muscle activation. Methods: Sixteen asymptomatic male participants were recruited. Four diagonal pattern exercises (scapular anterior elevation, posterior elevation, flexion-adduction-external rotation, flexion, abduction-external rotation), and two exercise phases (concentric and eccentric) were administered. Surface electromyography data were collected. Results: Upper trapezius activity was significantly higher during the concentric phase of scapular posterior elevation exercises compared with the others (p<0.05). The serratus anterior, anterior deltoid, and infraspinatus activities were significantly higher during shoulder diagonal pattern exercises compared with the scapular diagonal pattern exercises (p<0.05). Except for the lower trapezius, muscular activities during the concentric phase were significantly greater compared with the eccentric phase (p<0.05). Conclusion: The current study suggests that the diagonal pattern of exercise may contribute to selective strengthening of the shoulder complex muscles and that the form of exercise should be tailored to the subject. It also suggests that diagonal exercises with concentric contractions tend to be more beneficial than eccentric contractions for overall muscle recruitment, but the effects vary for specific diagonal patterns.

Geostrophic Response of the Yellow Sea to Cyclone Passage

  • Oh, Im-Sang;Subbotina, Marina M.
    • Journal of the korean society of oceanography
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    • v.31 no.4
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    • pp.183-195
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    • 1996
  • A barotropic non-linear numerical model is used to study the response of the Yellow Sea to winter cyclone passage. Cyclones normally come from the outside of the western boundary, China, and pass the region eastward. The cyclone parameters used for the present study are the following: the intensity, i.e., the maximum wind speed of the cyclone; the effective radius corresponding to this maximum; and the translation speed. The equations of motion are integrated over the depth which is supposed to be a constant. The Gaussian function is used to define the stream function of the wind. The following results have been found. A northward current is generated by the frontal part of the cyclone near the western boundary. After the cyclone leaves the sea area, a southward current is generated by the rear part of the cyclone. After that, a northward current is generated once again due to the westward propagating Rossby waves. The response of the sea to the cyclone passage is strongly influenced by a steady current when the steady current and the current due to the cyclone wind are of the same order. The steady current diminishes the sea response and reduces the speed of the southward current, and enhances the northward current speed. The intensity and the translation speed of a cyclone also influence the flow pattern significantly.

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Analysis of Initial Stage of Copper Electrodeposition for Fine Pattern (미세패턴용 구리도금시 초기 전착 거동 해석)

  • 조차제;최창희;김상겸;박대희
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.52 no.4
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    • pp.164-168
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    • 2003
  • The initial stage of copper electrodeposition has been known to be very important role for morphology and physical properties after final growth. The factors affecting the nucleation are electrode, current density, electrolyte and temperature. Current studies has illuminated the initial nucleation of copper electrodeposition in the viewpoint of the surface status of electrode and analyzed using EIS and SEM observation