• Title/Summary/Keyword: a short-distance type

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A Comparative Analysis on the Living Culture of Undergraduate Students for Establishment of University Culture - Focused on the Commuting Patterns - (대학문화정착을 위한 대학생의 생활문화비교분석 -지방대학 대학생의 통학유형을 중심으로 -)

  • Cho, Young-Hee;Cho, Myoung-Hee;Shim, Young;Kim, Dae-Nyun;Lee, Kyoung-Hee
    • Korean Journal of Human Ecology
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    • v.9 no.2
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    • pp.153-176
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    • 2000
  • The purpose of this study is to compare the living cultures among three types of undergraduate students, grouped by commuting patterns, attending universities in Chung-Cheong Do: a long-distance type, a short-distance type, and a living-alone type. The survey was performed with questionnaires and the subjects were 1167 undergraduate students. The results are as follows: for a long-distance type, the levels of housing environments and consumption expenditures were relatively high, but the students felt constrainted by the commuting time. For a short-distance type, the consensus in decision-making with parents and the degree of conflict reconciliation were the lowest. For a living-alone type, the levels of housing environments and consumption expenditures were relatively poorer, but the students spent relative]y more time at school and the attitudes of school and department which they belong to were relatively higher.

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A Code Correlation Type RF Short Range Measurement System for High-Speed Mobile Targets (고속 이동체에 대한 전파형 코드상관방식 근거리 측정 시스템)

  • Lim, Tae-Wook;Lee, Seok-Woo;Jung, Jong-Chul
    • Proceedings of the KIEE Conference
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    • 1998.07g
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    • pp.2430-2432
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    • 1998
  • Generally, in the best-known Pulse-type type and Frequency Modulated Continuous Wave(FM/CW)-type RF range measurement systems, the nearest measurable distance between antenna of system and targets is limited to several tens of meters. Moreover, in case of high-speed targets it is more difficult to measure the distance precisely. In this paper we design our own RF(X-band) range(up to 15 meters) measurement system usi code correlation for high- speed targets. It 0 the correlation value between transmitting receiving PN (Pseudo -Noise) codes. So we determine the distance between antenna of s and targets using this correlation value. We fabricated it using MIC techniques and experimental results show that the proposed syste fully qualified for a short range measurement syste

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A Development of Catamaran type Powerboat Applicable to Leisure and Transportation for a Short Distance in the Sea (해상레저 및 근거리 교통수단으로 활용 가능한 쌍동형 파워보트 개발)

  • 강성욱;임용범;정우철;박찬원
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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    • 2001.05a
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    • pp.60-64
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    • 2001
  • This paper describes the development of catamaran type powerboat applicable to leisure and transportation in the sea. Recently, the increasing prosperity of the leisure population has resulted in an increased popularity and need for recreational equipment such as water leisure powerboat. To satisfy the popularity and the need, catamaran type powerboat is developed applicable to leisure and simultaneously, as a means of tranportation for a short distance in the sea through the design using 3-Dimensional modeling method and experiments in circulating wate channel.

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Differences in the mandibular premolar positions in Angle Class I subjects with different vertical facial types: A cone-beam computed tomography study

  • Duan, Jun;Deng, Feng;Li, Wan-Shan;Li, Xue-Lei;Zheng, Lei-Lei;Li, Gui-Yuan;Bai, Yan-Jie
    • The korean journal of orthodontics
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    • v.45 no.4
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    • pp.180-189
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    • 2015
  • Objective: To compare the positions of the mandibular premolars in Angle Class I subjects according to vertical facial type. The results will provide a theoretical basis for predicting effective tooth movement in orthodontic treatment. Methods: Cephalometric parameters were determined using cone-beam computed tomography in 120 Angle Class I subjects. Subjects were categorized as short, normal, and long face types according to the Frankfort mandibular angle. Parameters indicating the position of the mandibular right premolars and the mandible were also measured. Results: The angle between the mandibular first premolar axis and buccal cortex, the distance between the root apex and buccal cortex, angle of vestibularization, arc of vestibularization, and root apex maximum movable distance were significantly greater in the short face type than in the long and norm face types. The angle between the mandibular second premolar axis and buccal cortex, the distance from root apex to buccal cortex, and the arc of vestibularization were significantly greater in the short face type than in the normal face type. Conclusions: There are significant differences in the mandibular premolar positions in Class I subjects according to vertical facial type.

Relationship between Hip Shape and Pattern Using 3D Body Model (3차원 인체모델을 이용한 엉덩이의 형태적 특징과 패턴과의 관계)

  • Cho, Young-Sook
    • Journal of the Korean Society of Clothing and Textiles
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    • v.33 no.2
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    • pp.266-275
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    • 2009
  • Variations of individual hip shapes are a major obstacle in pattern making for fitness. The drafting method is used for pattern making in today's apparel industry. Whilst catering to a limited number of information such as waist and hip sizes, this method does not cater to variations in hip shape. This paper describes the analysis of hip shapes using 3D body model and tries to make sure the relationship between hip shape and pattern by calculating hip angle and dart amount. We achieved results in analyzing various hip shapes by extracting hip angle. Moreover, various hip shapes can be divided into three types(A, B and C) by the hip angle value(KshKwsh). When we use computerized draping method to make a personalized pattern for a tigth skirt, we easily create complex dart lines automatically. Therefore we achieve the result of individual dart amount such as distance between dart lines and dart areas. C type of hip shape had short dart length, long distance between dart lines and a large amount of dart area. On the other hand, A type had long dart length, short distance between dart lines and small amount of dart area. B type had long length and long distance between dart lines and large amount of dart area. In traditional pattern making, distance between dart lines is usually proportional to amount of dart area because of similarity in dart line shape. In our pattern, there is no proportional relationship between dart line distance and dart area. This means that variations in hip shapes result in a wide variety of dart line curvature resulting in a wide range of dart area. By ensuring an accurate relationship between hip shape and pattern, it is possible to make patterns which result in clothing that not only fits well, but also exhibits other desirable properties.

Operational modal analysis of a long-span suspension bridge under different earthquake events

  • Ni, Yi-Qing;Zhang, Feng-Liang;Xia, Yun-Xia;Au, Siu-Kui
    • Earthquakes and Structures
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    • v.8 no.4
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    • pp.859-887
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    • 2015
  • Structural health monitoring (SHM) has gained in popularity in recent years since it can assess the performance and condition of instrumented structures in real time and provide valuable information to the asset's manager and owner. Operational modal analysis plays an important role in SHM and it involves the determination of natural frequencies, damping ratios and mode shapes of a constructed structure based on measured dynamic data. This paper presents the operational modal analysis and seismic response characterization of the Tsing Ma Suspension Bridge of 2,160 m long subjected to different earthquake events. Three kinds of events, i.e., short-distance, middle-distance and long-distance earthquakes are taken into account. A fast Bayesian modal identification method is used to carry out the operational modal analysis. The modal properties of the bridge are identified and compared by use of the field monitoring data acquired before and after the earthquake for each type of the events. Research emphasis is given on identifying the predominant modes of the seismic responses in the deck during short-distance, middle-distance and long-distance earthquakes, respectively, and characterizing the response pattern of various structural portions (deck, towers, main cables, etc.) under different types of earthquakes. Since the bridge is over 2,000 m long, the seismic wave would arrive at the tower/anchorage basements of the two side spans at different time instants. The behaviors of structural dynamic responses on the Tsing Yi side span and on the Ma Wan side span under each type of the earthquake events are compared. The results obtained from this study would be beneficial to the seismic design of future long-span bridges to be built around Hong Kong (e.g., the Hong Kong-Zhuhai-Macau Bridge).

Recognition of contact surfaces using optical tactile and F/T sensors integrated by fuzzy fusion algorithm (광촉각 센서와 힘/역학센서의 퍼지융합을 통한 접촉면의 인식)

  • 고동환;한헌수
    • 제어로봇시스템학회:학술대회논문집
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    • 1996.10b
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    • pp.628-631
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    • 1996
  • This paper proposes a surface recognition algorithm which determines the types of contact surfaces by fusing the information collected by the multisensor system, consisted of the optical tactile and force/torque sensors. Since the image shape measured by the optical tactile sensor system, which is used for determining the surface type, varies depending on the forces provided at the measuring moment, the force information measured by the f/t sensor takes an important role. In this paper, an image contour is represented by the long and short axes and they are fuzzified individually by the membership function formulated by observing the variation of the lengths of the long and short axes depending on the provided force. The fuzzified values of the long and short axes are fused using the average Minkowski's distance. Compared to the case where only the contour information is used, the proposed algorithm has shown about 14% of enhancement in the recognition ratio. Especially, when imposing the optimal force determined by the experiments, the recognition ratio has been measured over 91%.

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A Study on the Operational Efficiency of UAM(Urban Aerial Mobility)s (도심항공모빌리티의 운용효율성에 관한 연구)

  • Jaedo Song
    • Journal of the Korean Society for Aviation and Aeronautics
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    • v.30 no.4
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    • pp.23-32
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    • 2022
  • Prototype UAMs are shown to us in the market. When the complete product is delivered to market, the efficiency of each UAMs can be compared by default. Before the complete product is shown to us, the comparative study on efficiency of UAMs is performed under the product cost estimation. The efficiency analysis result reveals that both of Lift & Cruise type and vectored thrust type show good efficiency at the initial stage of product. At the near terms stage, five years later from initial stage end, efficiency gets some change. Vectored thrust type of UAMs show best efficiency at the near term stage of product. Because UAMs will be used in urban area, Seoul is the place where the UAMs will be used first. The flying route from Seoul City Hall to Yongsan Park, National Assembly in Yeouido, and City Airport is no more than 10 km distance. For this short distance route, efficiency will make multi-rotor type UAM be prefered to other types. For long distance route or commuting route, life & cruise type and vectored thrust type of UAMs will be prefered on account of operational efficiency.

The Power-train for the Bicycle adopting the Timing belt

  • Bu-Seob Sien;Dong-Gu Sien;Sung-Cheon Park;Young-Woong Kwon
    • International journal of advanced smart convergence
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    • v.13 no.1
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    • pp.201-205
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    • 2024
  • Currently, the most important issue on the earth is global warming, which causes climate change and leads to disasters. For this reason, each country is focusing on renewable energy, carbon neutrality, environmentally friendly energy and transportation. Bicycles used as short-distance vehicles do not emit gases harmful to the human body that pollute the Earth's atmosphere. Also, the use of bicycles has the effect of improving the health of people, and each country is designing a short distance transportation network using bicycles. In this study, we propose a model of a bicycle power-train that can use a belt as a power transmission medium. The basic principles and methods for applying the proposed new type of power-train to bicycles are presented.

A Study of the Threshold Voltage of a Symmetric Double Gate Type MOSFET (대칭형 이중 게이트 MOSFET에 대한 문턱전압 연구)

  • Lee, Jeong-Ihll;Shin, Jin-Seob
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.10 no.6
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    • pp.243-249
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    • 2010
  • In this thesis, in order to a equivalent circuit-analytical study for a symmetric double gate type MOSFET, we slove analytically the 2D Poisson's equation in a a silicon body. To solve the threshold voltage in a symmetric double gate type MOSFET from the derived expression for the surface potential which the two-dimensional potential distribution of a symmetric double gate type MOSFET is assumed approximately. This thesis can use short and long channel in a silicon body we introduce a new the threshold voltage model in a symmetric double gate type MOSFET and measure it the distance about the range of channel length up to 0.1 [μm].