• Title/Summary/Keyword: multi-modem

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Stacked LTCC Band-Pass Filter for IEEE 802.11a (IEEE 802.11a용 적층형 LTCC 대역통과 여파기)

  • Lee Yun-Bok;Kim Ho-Yong;Lee Hong-Min
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.16 no.2 s.93
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    • pp.154-160
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    • 2005
  • Microwave Otters are essential device in modem wireless systems. A compact dimension BPF(Band-pass Filter) for IEEE 802.11a WLAN service is realized using LTCC multi-layer process. To extrude 2-stage band-pass equivalent circuit, band-pass and J-inverter transform applied to Chebyshev low-pass prototype filter. Because parallel L-C resonator is complicate and hard to control the inductor characteristics in high frequency, the shorted $\lambda/4$ stripline is selected for the resonator structure. The passive element is located in the different layers connected by conventional via structure and isolated by inner GND. The dimension of fabricated stacked band-pass filter which is composed of six layers, is $2.51\times2.27\times1.02\;mm^3$. The measured filter characteristics show the insertion loss of -2.25 dB, half-power bandwidth of 220 MHz, attenuation at 5.7 GHz of -32.25 dB and group delay of 0.9 ns at 5.25 GHz.

Performance analysis of legacy line communication using high current powerlines in midrange wind turbines (중형급 풍력 발전기내 전력선을 이용한 무배선 통신 성능분석)

  • Kim, Kyoung-Hwa;Jeong, Seong-Uk;Nam, Seung-Yun;Kim, Hyun-Sik;Sohn, Kyung-Rak
    • Journal of Advanced Marine Engineering and Technology
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    • v.40 no.4
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    • pp.336-341
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    • 2016
  • This paper presents an implementation of a communication network in wind turbines, which exploits the power-line communication system (PLC). We used an inductive coupling unit and a multi-interface device to connect a data-communication terminal to the power line, to ensure that stable communication was possible at various electric current and voltage values of the generator. The results of the operation tests conducted on an operational wind turbine showed that the implemented PLC demonstrated a transmission rate of at least 43 Mbps with a 100% success rate. Moreover, a real-time image was transmitted. Thus, the system could be a useful alternative for implementing a communication network in wind turbines that does not require additional channels. Since the presented system is easy to implement, and can support various interfaces for data communication, it will be quite useful when a real-time monitoring system is launched in wind turbines.

Performance Assessment of Linear Motor for High Speed Machining Center (고속 HMC 이송계의 운동 특성 평가)

  • 홍원표;강은구;이석우;최헌종
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.158-161
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    • 2003
  • Recently, the evolution in production techniques (e.g. high-speed milling), the complex shapes involved in modem production design, and the ever increasing pressure for higher productivity demand a drastic improvement of the dynamic behavior of the machine tool axes used in production machinery. And also machine tools of multi functional and minimized parts are increasingly required as demand of higher accurate in some fields such as electronic and optical components etc. The accuracy and the productivity of machined parts are natural to depend on the linear system of machine tools. The complex workpiece surfaces encountered in present-day products and generated by CAD systems are to be transformed into tool paths for machine tools. The more complex these tool paths and the higher the speed requirements, the higher the acceleration requirements are needed to the machine tool axes and the motion control system, and the more difficult it is to meet the requirements. The traditional indirect drive design for high speed machine tools, which consists of a rotary motor with a ball-screw transmission to the slide, is limited in speed, acceleration, and accuracy. The direct drive design of machine tool axes. which is based on linear motors and which recently appeared on the market. is a viable candidate to meet the ever increasing demands, because of these advantages such as no backlash, less friction, no mechanical limitations on acceleration and velocity and mechanical simplicity. Therefore performance tests were carried out to machine tool axes based on linear motor. Especially, dynamic characteristics were investigated through circular test.

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Hierarchical Network Synchronization of STAR Network based on TDMA (STAR 망 TDMA시스템의 계층적 망동기 방식)

  • Yoon, Juhyun
    • Journal of the Korea Society of Computer and Information
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    • v.19 no.1
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    • pp.77-84
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    • 2014
  • In this paper, we propose the hierarchical network synchronization scheme that is backward compatible for the existing commercial system, efficient for total system performance, and whose hardware modification is minimized. This system performance is, the relationship among bandwidth efficiency, complexity and MODEM performance, and superiority of network system applicability. The proposed structure can remedy the high hardware complexity and the lower accuracy of network sychronization that the existing satellite communication terminal system in the star network based on TDM/MF-TDMA of DVB-S2/RCS standards has. Besides, It has high efficiency in view of cost and system performance if the system designed for satellite broadcast requires system upgrade. In the body section, its hardware complexity and system performance of the proposed algorithm is analysed theoretically and treated with the related parameters(symbol rate, spreading factor, etc.) and the BER performance of control channel through the computer simulation for its verification that it can be applied for communications system.

LOHAS Fashion Design Development -Focus on Party Wear- (로하스 패션 디자인 개발 연구 -파티웨어를 중심으로-)

  • Cho, Min-Young;Park, Hye-Won
    • Journal of the Korean Society of Clothing and Textiles
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    • v.33 no.11
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    • pp.1733-1743
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    • 2009
  • The LOHAS trend is based on a present and future culture with a sustainable influence on the life of modem humans. This study examines the LOHAS trend to create a design that is practical and reflects a notion of LOHAS in quality. Design making is selected with three sub-themes under the concept 'With Us, Nature & High Touch' and the dress design that is suitable to the type and purpose of the parties following the concept. Theme A, "Neo-Classicism" is for a reception party. It made efficient use of 'Type of environmentally friendly material practical use + Type of multi-function design + Type of order production + Type of society morals design'. Theme B, "Between Virtual & Reality" is for a wedding reception. It made efficient use of 'Type of environmentally friendly material practical use + Type of multifunction design + Type of retrenchment design + Type of order production + Type of society morals design'. Theme C, "Arty Illusion" is for a cocktail party. It made efficient use of 'Type of Re-design + Type of nature motive practical use + Type of the higher sensitivity pursuit design + Type of order production + Type of society morals design'. This study explained that nature, environment, and a sense about society are put to practical use in fashion design through the creation of a fashion design to apply a LOHAS fashion design notion and a special quality.

Analysis of Throughput Field Test Data Acquired Using Vehicle Mounted Multi-Band MIMO Antenna (다중대역 MIMO 안테나의 차량탑재 필드테스트 결과 분석)

  • Kim, Seung-Ho;Chung, Jae-Young
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.29 no.10
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    • pp.745-751
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    • 2018
  • This paper reports on the design of a multiband multiple-input and multiple-output(MIMO) antenna for long-term evolution(LTE) vehicular communication and includes an analysis of the throughput field test results that were acquired by mounting the antenna to a vehicle. The antenna used for the field test was designed as a planar structure and included multiple stubs to obtain multiband resonant characteristics operating in the LTE(0.8~0.9 GHz, 1.7~2.2 GHz), Wi-Fi(2.4~2.48 GHz), and wireless access in vehicular environments (WAVE)(5.8~5.9 GHz) frequency bands. For the field test, antenna prototypes were mounted on the dashboard and roof of a vehicle and connected to the experimental LTE modem. The data transfer rate(throughput), signal-to-interference-plus-noise ratio(SINR), and reference signal received quality(RSRQ) were measured and analyzed in various real-world radio wave environments. Based on these results, the relationship between the SINR and throughput according to the field intensity is confirmed.

Cultural Facility Design in Japan (일본의 문화시설 현황과 디자인 특징에 관한 연구 - 1990년대 신축시설을 중심으로 -)

  • 김선영
    • Archives of design research
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    • v.14 no.3
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    • pp.15-26
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    • 2001
  • The goal of this study is threefold. First, this study explores the historical origin and architectural characteristics of cultural facilities in Japan. For this purpose, I examine various cultural facilities in Japan such as theaters, multi-purpose halls, convertible spaces and cultural centers. Second, this study also sheds a new light on the meaning of the relationships between cultural activity and architecture design in Japan. For this, I primarily look at the various categories of cultural buildings in Japan and their main functions. Finally, I demonstrate how both traditional and modem design elements are embodied in Japanese cultural facilities.

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A Surveillance System Combining Model-based Multiple Person Tracking and Non-overlapping Cameras (모델기반 다중 사람추적과 다수의 비겹침 카메라를 결합한 감시시스템)

  • Lee Youn-Mi;Lee Kyoung-Mi
    • Journal of KIISE:Computing Practices and Letters
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    • v.12 no.4
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    • pp.241-253
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    • 2006
  • In modem societies, a monitoring system is required to automatically detect and track persons from several cameras scattered in a wide area. Combining multiple cameras with non-overlapping views and a tracking technique, we propose a method that tracks automatically the target persons in one camera and transfers the tracking information to other networked cameras through a server. So the proposed method tracks thoroughly the target persons over the cameras. In this paper, we use a person model to detect and distinguish the corresponding person and to transfer the person's tracking information. A movement of the tracked persons is defined on FOV lines of the networked cameras. The tracked person has 6 statuses. The proposed system was experimented in several indoor scenario. We achieved 91.2% in an averaged tracking rate and 96% in an averaged status rate.

Real Estate Development and Place Marketing Strategy in Dimension of Spatial Policy - A Case Study of Tokyo Metropolitan Area - (공간정책수단으로서 부동산개발과 장소마케팅전략 - 동경대도시권을 사례로 -)

  • 이정훈
    • Journal of the Korean Geographical Society
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    • v.37 no.1
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    • pp.61-74
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    • 2002
  • In late 1980s, many suburban cities in Tokyo metropolitan area have tried to construct office parks, such as Makuhari New Town, Minato Mirai 21 to promote knowledge based economy. As the most important player of this mesa project, the local government mobilized local resources from various private sectors. The local government adopted place marketing strategy to attract companies and consumers with thick pocket. The composition of this strategy embraces publicity, uniqueness, centrality of function and information and comfortability for formation of the office park. Headquarters and producer service offices were relocated in the suburban office parks for the first time in the history of modem Tokyo since 1920s. Although it is the ongoing project that encounters some financial difficulties, the office park Project will be a sound foundation for future growth of knowledge-based economy.

Criticism as a Protective Device of Art (비평의 본질로서의 예술성과 비평의 제문제)

  • 김춘희
    • Lingua Humanitatis
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    • v.1 no.2
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    • pp.141-158
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    • 2001
  • Criticism of today finds itself in an awkward situation, for it is now being transformed in the same way that literature and the arts were transformed by the avant-garde movements at the end of the 19th century and the beginning of the 20th century. It is characterized predominantly by a break with harmony and with the values of realism. As such, it is driven by a post-modem ethos, an artistic, social, and cultural phenomenon that veers toward open, fragmentary, and indeterminate forms. In this paper, I examine today's most urgent social and cultural issues with reference to artistic production and criticism, in order to illuminate the true nature of criticism. The outstanding questions in the world of art criticism are given in five categories: the lack of critical reality in argumentative criticism; the problem of artistic and literary production in global capitalism; the artistic mind and its consciousness of socio-historical ideology; anxiety of the rise of cyberjournalistic criticism; and the question of subordination to western systems in the field of interpretation and criticism. For my analysis, I have tried to formulate a three-dimensional critique structure that will help us organize the relationships between the points of argument: 1) criticism as a creative force behind the artist; 2) criticism as critique of artistic production; and 3) criticism as critique of other critics. This multi-layered structure will be appropriate to our task of interpretation and evaluation, as the proposed complex structure of criticism will be able to embrace the diverse aspects of our problematic argument. In the final analysis, my argument resolves itself into a question of art, more specifically into a question of criticism as a protective device of art in an age threatened by globalization and cultural monopolization.

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