• Title/Summary/Keyword: frame delay

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A Study on the Priority Analysis of Work Delay Factors in Steal-frame Work using FMEA (FMEA를 활용한 철골공사 작업지연요인의 중요도에 관한 연구)

  • Lee, Hyun-Chul;Lee, Jae-Hong;Go, Seong-Seok
    • Korean Journal of Construction Engineering and Management
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    • v.10 no.1
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    • pp.91-101
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    • 2009
  • The factors of uncertainty such as work delay could cause many problems, for example, increase of construction cost and terms of work, and the deterioration of quality. Because of these, the uncertainty risk is regarded as an important management factor to obtain the success of construction project. So, the systematic management plan about the uncertainty factors is needed because it plays an important role in the completion of entire project. And also analysis of some factors which can cause the work delay can be one way of improving construction project's certainty and making it competitive. In this reason, we have to make an effort to set a priority based on analysis of quantitatively numerical value about work delay factors to manage them effectively. Thus, this study aims to suggest the basic data for the effective management and prevention of work delay in steel-frame work which is progressive actively now, along with increasing of demand of high-rise buildings by analyzing each reasons of work delay factors and also by suggesting important management factors that are coded according to each construction work using FMEA method which could give a data about the importance of work delay factors through quantitatively numerical value.

Time Delay Compensation of Induction Motor Vector Control System (유도전동기 벡터제어 시스템의 시간지연 보상)

  • 박철우;최연호;임성운;윤경섭;권우현
    • 제어로봇시스템학회:학술대회논문집
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    • 2000.10a
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    • pp.231-231
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    • 2000
  • It is proposed that a novel method which can compensate the time delay occurs in overall system, when voltage and current is measured, owing to LPF, hysteresis control inverter and microprocessor program computation time. The Proposed scheme estimates the time delay using the difference between Q-axis stator current command and time delayed Q-axis stator current in synchronous reference frame, and compensates the time delay of voltage and current using angular displacement of DQ transformation. The proposed scheme compensates accurately the time delay occurs in overall system. Therefore performance of vector control system is improved highly and it is verified by simulation and experiment.

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Accelerating RFID Tag Identification Processes with Frame Size Constraint Relaxation

  • Park, Young-Jae;Kim, Young-Beom
    • Journal of information and communication convergence engineering
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    • v.10 no.3
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    • pp.242-247
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    • 2012
  • In the determination of suitable frame sizes associated with dynamic framed slotted Aloha used in radio frequency identification tag identification processes, the widely imposed constraint $L=2^Q$ often yields inappropriate values deviating far from the optimal values, while a straightforward use of the estimated optimal frame sizes causes frequent restarts of read procedures, both resulting in long identification delays. Taking a trade-off, in this paper, we propose a new method for determining effective frame sizes where the effective frame size changes in a multiple of a predetermined step size, namely ${\Delta}$. Through computer simulations, we show that the proposed scheme works fairly well in terms of identification delay.

Generalized cross correlation with phase transform sound source localization combined with steered response power method (조정 응답 파워 방법과 결합된 generalized cross correlation with phase transform 음원 위치 추정)

  • Kim, Young-Joon;Oh, Min-Jae;Lee, In-Sung
    • The Journal of the Acoustical Society of Korea
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    • v.36 no.5
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    • pp.345-352
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    • 2017
  • We propose a methods which is reducing direction estimation error of sound source in the reverberant and noisy environments. The proposed algorithm divides speech signal into voice and unvoice using VAD. We estimate the direction of source when current frame is voiced. TDOA (Time-Difference of Arrival) between microphone array using the GCC-PHAT (Generalized Cross Correlation with Phase Transform) method will be estimated in that frame. Then, we compare the peak value of cross-correlation of two signals applied to estimated time-delay with other time-delay in time-table in order to improve the accuracy of source location. If the angle of current frame is far different from before and after frame in successive voiced frame, the angle of current frame is replaced with mean value of the estimated angle in before and after frames.

Simple Routing Control System for 10 Gb/s Data Transmission Using a Frequency Modulation Technique

  • Omoto, Daichi;Kishine, Keiji;Inaba, Hiromi;Tanaka, Tomoki
    • IEIE Transactions on Smart Processing and Computing
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    • v.5 no.3
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    • pp.199-206
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    • 2016
  • This paper describes a simple routing control system. We propose achieving high-speed data transmission without modifying the data frame configuration. To add a routing control signal, called the "labeling signal" in this paper, to the data frame, we use a frequency modulation technique on the transmitted frame. This means you need not change the data frame when you transmit additional signals. Using a prototype system comprising a field-programmable gate array and discrete elements, we investigate the system performance and devise a method to achieve high resolution. A three-channel routing control for a 10 Gb/s data frame was achieved, which confirms the advantages of the proposed system.

A Mechanism for Dynamic Allocation of Frame Size in RFID System

  • Lim, In-Taek
    • Journal of information and communication convergence engineering
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    • v.6 no.4
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    • pp.364-369
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    • 2008
  • The FSA algorithm for identifying multiple tags in RFID systems is based on the slotted ALOHA scheme with a fixed frame size. The performance of FSA algorithm is dependent on the frame size and the number of tags in the reader's identification range. Therefore, this paper proposes a new ODFSA. The proposed ODFSA algorithm dynamically allocates the optimal frame size at every frame based on the number of tags in the reader's identification range. According to the simulation results, the system efficiency of the proposed algorithm should be maintained optimally. Also, the proposed algorithm always obtained the minimum tag identification delay.

Performance Improvement of Turbo Code in low SNR and short frame sizes (낮은 SNR과 짧은 프레임에서 터보코드 성능 개선)

  • 정상연;이용식;심우성;허도근
    • Proceedings of the IEEK Conference
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    • 1999.06a
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    • pp.61-64
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    • 1999
  • The turbo code appropriate to IMT-2000 is known to have a good performance whenever the size of frame increases. But it is not appropriate to a sort of video service to need real time because of decoding complexity and long delay time by the size of frame. Therefore this paper proposes decoding decision algorithm of short frame in which soft output is weighted according to iteration number in turbo decoder. Performance of the proposed algorithm is analysed in the AWGN channel when short length of frame is 100, 256, 640. As the result. it is appeared that the proposed decoding decision algorithm has improved in BER other than in the existing MAP decoding algorithm.

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A New Control Method for a Single-Phase Hybrid Active Power Filter based on a Rotating Reference Frame

  • Kim, Jin-Sun;Kim, Young-Seok
    • Journal of Power Electronics
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    • v.9 no.5
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    • pp.718-725
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    • 2009
  • To get instantaneous reference data in a single power system with vector space phasors, the instantaneous load current is adopted as a phase and another new signal, which is delayed through filtering by the phase-delay property of a low-pass filter, is used as the secondary phase. Because the two-phases have a different phase, the instantaneous value of the harmonic current can be obtained without a time-delay in calculation. The reference voltage is created by multiplying the coefficient k by the compensation current using the rotating reference frame synchronized with the source-frequency. To verify the validity of the proposed control method, experiments are carried out on a prototype of the single-phase hybrid active power filter system.

An Improved AE System for Mobile Digital Still Camera (모바일 디지털카메라 모듈에 대한 개선된 AE 알고리즘 구현)

  • Cho, Sun-Ho;Kim, Dong-Han;Park, Chong-Kug
    • Journal of Institute of Control, Robotics and Systems
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    • v.14 no.5
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    • pp.426-431
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    • 2008
  • In this paper, an improved AE system for digital still camera is proposed. AE system is auto exposure system to maintain optimized brightness of output image. But there is limitation for mobile devices to get high quality image with the conventional AE algorithm, because of organizational restriction of system. The conventional research has been studied only electronic shutter and AGC on the AE algorithm. In this paper, we suggest new AE algorithm included target setting, frame delay, Gamma Correction as well as electronic shutter and AGC to get high quality image. The proposed algorithm show improved result at control speed and ability of luminance expression.

Development of Computing Model for the Process and Operation Interval of Reinforced Concrete Work using Web-CYCLONE (철근콘크리트 골조공사의 프로세스 및 공정 공백 산출 시뮬레이션 모형 개발)

  • Park, Sang-Min;Son, Chang-Baek;Lee, Dong-Eun
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2012.05a
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    • pp.341-343
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    • 2012
  • This study introduces a method for computation of process and operation gap in the specific construction operation(i.e., RC frame construction applying a block-grouping scheme) using CYCLONE-based simulation modeling and analysis technique. Since uncertainty of construction environment exists, a thoughtful production planning is required to effectively deal with a risk resulting in schedule delay in advance. This study presents the concepts of a time delay occurred in a process level and operation level in a operation model, and a method of measuring gap-times in each level while the simulation progresses. It helps a site manager to decide how many segmentation in a construction block is suitable for eliminating unproductive time-delays under the constrained resources (e.g., laborer, equipment). A case study presents a network model representing a three segmented RC frame work, and result obtained from the simulation experiment.

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