• Title/Summary/Keyword: Transition-state

Search Result 1,899, Processing Time 0.036 seconds

Comparative Study on Classical Control and Modern Control via Analysis of Circuit-based Time Response (회로망 기반의 시간응답 해석에 따른 고전제어와 현대제어의 비교 연구)

  • Min, Yong-Ki
    • The Journal of the Korea institute of electronic communication sciences
    • /
    • v.12 no.4
    • /
    • pp.575-584
    • /
    • 2017
  • It is suggested the circuit network to analyze the time response of control system. And it is analyzed the interrelation for classical control and modern control by the transfer function and the state equation. Without complicated integration of state transition equation, it is suggested to possible time response by combining the state transition matrix and the transfer function. A source program is coded to display the time response according to the unit-step and the sinusoidal input. Transient response is analyzed in the unit-step input and phase difference between current and voltage is analyzed in sinusoidal input. As writing the suggested contents in transient response or state-space analysis, it is improved the understanding for control engineering and ability for system design.

A Hardware-Based String Matching Using State Transition Compression for Deep Packet Inspection

  • Kim, HyunJin;Lee, Seung-Woo
    • ETRI Journal
    • /
    • v.35 no.1
    • /
    • pp.154-157
    • /
    • 2013
  • This letter proposes a memory-based parallel string matching engine using the compressed state transitions. In the finite-state machines of each string matcher, the pointers for representing the existence of state transitions are compressed. In addition, the bit fields for storing state transitions can be shared. Therefore, the total memory requirement can be minimized by reducing the memory size for storing state transitions.

Electrocaloric Effect in Emerging Fluorite-Structure Ferroelectrics (새로운 플루오라이트 구조 강유전체의 Electrocaloric Effect)

  • Yang, Kun;Park, Ju Yong;Lee, Dong Hyun;Park, Min Hyuk
    • Korean Journal of Materials Research
    • /
    • v.30 no.9
    • /
    • pp.480-488
    • /
    • 2020
  • The electrocaloric effect can be observed in pyroelectric materials based on conversion between electrical and thermal energy, and can be utilized for the future environment-friendly refrigeration technology. Especially, a strong electrocaloric effect is expected in materials in which field-induced phase transition can be achieved. Emerging fluorite-structure ferroelectrics such as doped hafnia and zirconia, first discovered in 2011, are considered the most promising materials for next-generation semiconductor devices. Besides application of fluorite-structure ferroelectrics for semiconductor devices based on their scalability and CMOS-compatibility, field-induced phase transition has been suggested as another interesting phenomenon for various energy-related applications such as solid-state cooling with electrocaloric effect as well as energy conversion/storage and IR/piezoelectric sensors. Especially, their giant electrocaloric effect is considered promising for solid-state-cooling. However, the electrocaloric effect of fluorite-structure oxides based on field-induced phase transition has not been reviewed to date. In this review, therefore, the electrocaloric effect accompanied by field-induced phase transition in fluorite-structure ferroelectrics is comprehensively reviewed from fundamentals to potential applications.

Improved Partial UIO sequence generation method (개선된 Partial UIO sequence 생성 방법의 제안)

  • 최진영;홍범기
    • The Journal of Korean Institute of Communications and Information Sciences
    • /
    • v.19 no.11
    • /
    • pp.2255-2263
    • /
    • 1994
  • Protocol conformance testing consists of procedures to observe an output and to check a transition state of the Implementation Under Test considered as a black box by applying an input. There are several methods to check the transition state such as Unique Input/Output(UIO) sequence. Distinguishing Sequence(DS) and Characterization Set(CS). Particularly, as a test method for a state having no UIO sequence, Partial UIO sequence method can be considered. In this paper, three properties which can be found among Partial UIO sequence and a modified algorithm using these properties are suggested.

  • PDF

Uniform bend transition and twist retention time improvement in a bistable chiral splay nematic liquid crystal cell

  • Kang, Sang-Ho;Jhun, Chul-Gyu;Lee, Seong-Ryong;Kim, Jae-Chang;Yoon, Tae-Hoon
    • 한국정보디스플레이학회:학술대회논문집
    • /
    • 2004.08a
    • /
    • pp.1173-1176
    • /
    • 2004
  • In a previous work we reported the bistable property by doping a chiral material in a splay cell. The bistable states are the splay state and the metastable 180twist state. The retention time of the metastable state can be changed by the variation of d/p (cell gap over pitch), cell gap, pretilt angle, azimuthal anchoring force, liquid crystal material, and so on. In this paper we will present uniform bend transition and twist retention time improvement in a multi-domain BCSN LC cell by using the multi cell gap method.

  • PDF

Transient Characteristics of Separately Excited d-c Motor Driven by Thyristor d-c Chopper (Thyristor 직류 Chopper방식으로 구동되는 직류타여자식 전동기의 과도특성해석법)

  • Hee Young Chun
    • 전기의세계
    • /
    • v.21 no.2
    • /
    • pp.9-19
    • /
    • 1972
  • The transient characteristics of separately excited d-c motor driven by thyristor d-c chopper is studied in this paper. The armature controlled system is applied. As a result of theoretrical analysis the following conculsions were drawn: (1) For the transient analysis, it is recognized that the state transition analysis is a more general method and powerful tool than the state equation method or signal flow graph method, although it includes iterative matrix calculations. And the system is dealt with a finite width sampled-data system in the state transition analysis. (2) The transient characteristics of the motor angular velocity and its torque to the sampling duration variation are compared with those due to the amplitude variation of d-c chopper voltage as follows. The attenuation rate of the transient characteristics is equal in both cases, but the initial value of the transient characteristics in former case is greater than in latter case. (3) The roots of characteristics equation of the system lie inside the unit circle of the Z-plane. Therefor the system is stable. Further it is found that as the sampling duration is decreased the relative stability is lessened.

  • PDF

Multiple Behavior s Learning and Prediction in Unknown Environment

  • Song, Wei;Cho, Kyung-Eun;Um, Ky-Hyun
    • Journal of Korea Multimedia Society
    • /
    • v.13 no.12
    • /
    • pp.1820-1831
    • /
    • 2010
  • When interacting with unknown environments, an autonomous agent needs to decide which action or action order can result in a good state and determine the transition probability based on the current state and the action taken. The traditional multiple sequential learning model requires predefined probability of the states' transition. This paper proposes a multiple sequential learning and prediction system with definition of autonomous states to enhance the automatic performance of existing AI algorithms. In sequence learning process, the sensed states are classified into several group by a set of proposed motivation filters to reduce the learning computation. In prediction process, the learning agent makes a decision based on the estimation of each state's cost to get a high payoff from the given environment. The proposed learning and prediction algorithms heightens the automatic planning of the autonomous agent for interacting with the dynamic unknown environment. This model was tested in a virtual library.

State Transition Model of Demand Response Considering Behavior Patterns of Customer (소비자의 행동 패턴을 고려한 수요반응의 상태 천이 모델)

  • Kwag, Hyung-Geun;Lee, Na-Eun;Kim, Jin-O
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.62 no.8
    • /
    • pp.1074-1079
    • /
    • 2013
  • Demand response(DR) is potential generation alternative to improve the reliability indices of system and load points. However, when demand resources scheduled in DR market fail to reduce demand, it can create new problems associated with maintaining a reliable supply. In this paper, a reliability model of demand resource is constructed considering customers' behaviors in the same form as conventional generation units, where availability and unavailability are associated with the simple two-state model. As a result, the generalized reliability model of demand resources is represented by multi-state model.

On Detecting the Transition Regions of Phonemes by Using the Asymmetrical Rate of Speech Waveforms (음성파형의 비대칭율을 이용한 음소의 전이구간 검출)

  • Bae, Myung-Jin;Lee, Eul-jae;Ann, Sou-Guil
    • The Journal of the Acoustical Society of Korea
    • /
    • v.9 no.4
    • /
    • pp.55-65
    • /
    • 1990
  • To recognize continued speech, it is necessary to segment the connected acoustic signal into phonetic units, In this paper, as a parameter to detect transition regions in continued speech, we propose a new asymmetrical rate. The suggested rate represents a change rate of magnitude of speech signals. As comparing this rate with other rate in adjacent frame, the state of the frame can be distinguished between steady state and transient state.

  • PDF

The Gentan Probability, A Model for the Improvement of the Normal Wood Concept and for the Forest Planning

  • Suzuki, Tasiti
    • Journal of Korean Society of Forest Science
    • /
    • v.67 no.1
    • /
    • pp.52-59
    • /
    • 1984
  • A Gentan probability q(j) is the probability that a newly planted forest will be felled at age-class j. A future change in growing stock and yield of the forests can be predicted by means of this probability. On the other hand a state of the forests is described in terms of an n-vector whose components are the areas of each age-class. This vector, called age-class vector, flows in a n-1 dimensional simplex by means of n×n matrices, whose components are the age-class transition probabilities derived from the Gentan probabilities. In the simplex there exists a fixed point, into which an arbitrary forest age vector sinks. Theoretically this point means a normal state of the forest. To each age-class-transition matrix there corresponds a single normal state; this means that there are infinitely many normal states of the forests.

  • PDF