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설문조사를 통한 신규 통신서비스의 수요예측 방안

  • 김지표;홍정식;안재경;강원철;이병철;한권훈
    • Proceedings of the Korean Operations and Management Science Society Conference
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    • 1998.10a
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    • pp.245-248
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    • 1998
  • In this paper, as a forecasting method, the market survey for forecasting demand is introduced for the estimation of subscriber line demand in the optical access networks. The market survey method for the new multimedia services is attempted to collect information directly from customers using the questionnaires for home-users and business-users in local loops. Analysis rationale of questionnaires is suggested to estimate the number of subscriber lines. Also, two measures are presented to quantify the credibility on survey responses; one is the probability that the customer will use the multimedia services and the other is the rate that the subscriber line demand will be actually realized. The former measure is calculated based on the information on customers and the Logit analysis. The latter is obtained by the degree of customer's knowledge about specific services and the customer's willingness to use the services. Based on the values of two measures, the number of subscriber line demand can be developed for installing the optical access networks.

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Sound Radiation Analysis of Tire under The Action of Moving Line Forces (이동분포하중을 받는 타이어의 음향방사 해석)

  • Kim, Byoung-Sam
    • Proceedings of the KAIS Fall Conference
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    • 2011.05b
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    • pp.529-532
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    • 2011
  • A theoretical model has been studied to describe the sound radiation analysis for structure vibration noise of vehicle tires under the action of random moving line forces. When a tire is analyzed, it had been modeled as curved beams with distributed springs and dash pots that represent the radial, tangential stiffness and damping of tire, respectively. The reaction due to fluid loading on the vibratory response of the curved beam is taken into account. The curved beam is assumed to occupy the plane y=0 and to be axially infinite. The expression for sound power is integrated numerically and the results examined as a function of Mach number, wave-number ratio and stiffness factor. The experimental investigation for structure vibration noise of vehicle tire under the action of random moving line forces has been made. Based on the Spatial Transformation of Sound Field techniques, the sound power and sound radiation are measured. Results strongly suggest that operation condition in the tire material properties and design factors of the tire govern the sound power and sound radiation characteristics.

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Drape property of fabrics and Shape horizontal section of hem line of flare skirt (직물의 Drape 특성과 Flare Skirt의 헴라인 단면 형상)

  • 이수정
    • Journal of the Korean Home Economics Association
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    • v.33 no.4
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    • pp.149-155
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    • 1995
  • In this study, the formative property of flare skirts is carry out by the shape horizontal sections of hem line. Flare skirts was made by 10 kinds of fabrics with different physical properties. the length of flare skirts was 60cm. The main results obtained are as follows ; 1, The shape horizontal sections of hem line has differed with number of nodes and fabrics properties, in direction of texture. 2. According to the fabrics analysis of drapability decreased in order from Polyester/nylon(20/80)>Polyester(twill, thickness 0.2441)>Polyester(plain, thickness0.3760)>Polyester(plain, thickness 0.3687)>Polyester(plain, thickness 0.3101). 3. The correlation between the number of nodes and wave-height of modes and breadth showed a high negative correlation with the drapability of fabrics.

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A Study on Characteristics of Design Parameters for In-line Duct Fan (관류형팬의 설계변수 특성에 관한 연구)

  • Park, J.W.;Huh, J.C.;Lee, C.H.;Park, W.S.
    • 유체기계공업학회:학술대회논문집
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    • 2005.12a
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    • pp.373-377
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    • 2005
  • The Performance of in-line duct fan depends on the design parameters of impeller and guide vane. such as sweep back angle of impeller, the number of blades, outlet blade angle, guide vane angle etc. In this experimental study total four kinds of impellers having different sweep back angles, $90^{\circ},\;72.5^{\circ},\;55^{\circ},\;37.5^{\circ}$ with 8 guide vanes, different the number of blades, 6ea, 8ea, 10ea, 12ea, different kinds of outlet blade angles, $30^{\circ},\;45^{\circ}.\;60^{\circ}$ and different kinds of guide vane angles, $15^{\circ},\;30^{\circ},\;45^{\circ}$ were selected and their performance measured to investigate the effects of them. The results were non-dimensionalized to compare their performance.

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A Study on Degradation Properties of Silicone Cable due to Partial Discharge (부분 방전에 의한 실리콘 케이블의 열화 특성에 관한 연구)

  • Lee, Sung Ill
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.28 no.1
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    • pp.34-39
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    • 2015
  • In this study, the characteristics of partial discharge was measured for the four core silicone cable (0.6/1.0 kV, $1.0SQ{\times}4C$) with insulated part of 15 cm and conductor of 1cm. The following results have been confirmed as a result of this study. When the first line of cable is connected to the positive electrode and the second, third line of cable is connected to the negative electrode, it found that the inception voltage and extinction voltage decreased with increasing the line of negative electrode, and the partial discharge charge quantity(Q) increases, while the number of discharge occurrence has decreased. The inception voltage and extinction voltage of partial discharge has decreased with increasing the degradation rate in the 33%, 67%, 100%. Also, it confirmed that the partial discharge charge quantity(Q) and the number of discharge occurrence has decreased.

A Heuristic Approach for Establishing On-line Real-time Exam Timetables in Cyber Universities (중복시험을 배제할 수 있는 사이버대학의 온라인 실시간 시험 시간표 작성 방안)

  • Park, Chan-Kwon;Kim, Hyoung-Do;Yum, Ji-Hwan
    • Journal of Information Technology Applications and Management
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    • v.14 no.3
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    • pp.227-236
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    • 2007
  • Students in cyber universities can take every course because there are no physical constraints such as class rooms. On the other hand. cyber universities should take a heavy burden to schedule real-time exams in a designated time period. Any two courses a student takes must not be simultaneously allocated to a time slot in such a schedule. It is well known that the complexity of this kind of scheduling problem increases exponentially as the number of courses does. This research provides a heuristic method to make on-line real-time exam timetables with minimal exam time span. It considers the constraint of not allocating courses a student takes to simultaneous exam time and prioritizes courses by the number of students.

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Current Limiting Characteristics of transformer type SFCL using neutral line (중성점을 이용한 변압기형 초전도 한류기의 전류제한 특성 분석)

  • Cho, Yong-Sun;Choi, Hyo-Sang;Park, Hyoung-Min;Lee, Ju-Hyoung;Jung, Byung-Ik
    • Proceedings of the KIEE Conference
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    • 2007.07a
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    • pp.2090-2091
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    • 2007
  • We investigated the characteristics of transformer type SFCL with neutral line. The transformer type SFCL having neutral line has achieved the simultaneous quench because the secondary winding has acted as parallel reactor. The fault current of SFCL was limited according to ratio of turn number between primary and secondary windings. Therefore, the power burden of superconducting element can be reduced by reduction of ratio of turn number between primary and secondary windings. As a result, we could expect reduction of it's volume in the transformer type SFCL.

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A Study on Workload Smoothness Considering Work Relatedness In the U-Line (U라인에서의 작업관련성을 고려한 작업부하 평활화에 관한 연구)

  • 김우열;김용주;김동묵
    • Journal of the military operations research society of Korea
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    • v.28 no.2
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    • pp.116-124
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    • 2002
  • In just-in-time production systems, U-shaped production lines rather than traditional straight lines are often adopted since they have some advantages. The advantages of U-lines over straight lines are that the workstations required can be reduced and the necessary number of workers can be easily adjusted when the demand rates are changed. In this paper, we present a new genetic algorithm(GA) to minimize the number of workstations primarily and improve the work relatedness secondarily in the U-line production systems. Also, a new heuristic method is presented according to the work related factors and characteristics of U-line balancing. Some major aspects of the proposed GA are discussed, with emphasis on representation, decoding and evaluation function. Extensive experiments are carried out on well-known test-bed problems in the literature to verify the performance of our algorithm . The computational results show that our algorithm is a promising alternative to existing heuristics.

Optimal Material Flow of AGV based Production Lines (자동안내운반기로 된 생산라인의 최적 물류흐름)

  • 장석화
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.12 no.19
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    • pp.73-78
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    • 1989
  • This paper concerns the production model that the Automatic Guided Vehicles(AGVs) is used as transporters in assembly line. The model suggests that assembly parts may inter the beginning of the line in multiple units instead entering one unit at a time. Costs are occured in proportion to the number of vehicle on the line and job flow time. Here, the objective of this model is to determine the number of vehicle to minimize the total cost for M products production. Theoretical results are proved which lead to the development of algorithm for solution search. The solution search procedure is illustrated by a numerical example.

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Subway Station's Seating Capacity of Temporary Evacuees from Disastrous Situation through Analyzing the Number of Toilets (위생기구(변기) 수 분석을 통한 지하철역의 임시 대피인원 수용 능력 산정)

  • Sohn, Byonghu;Hwang, Eun-Kyoung
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.25 no.7
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    • pp.418-426
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    • 2013
  • With advantages of open spaces and existing HVAC facilities, subway station, if unexpected disastrous situation happens on the ground, can be used as a temporary safe place for evacuees. The main objective of this study is to establish a guideline on estimating evacuation capacity of the subway station and evaluating levels of service of evacuation for officials to control the situation. This guideline includes available spaces of the station, capacity of sanitary fixtures, and total number of passengers, etc. In this paper, we first analyzed the number of passengers of SMRT (Line 5~Line 8) during AM peak hour and then evaluated the number of passengers using toilets at that time. In addition, we calculated the seating capacity of subway stations on SMRT using the difference between the actual number of toilets and the estimated number of ones from the occupancy time of each toilet.