• Title/Summary/Keyword: iterative method

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A Clustered Reconfigurable Interconnection Network BIST Based on Signal Probabilities of Deterministic Test Sets (결정론적 테스트 세트의 신호확률에 기반을 둔 clustered reconfigurable interconnection network 내장된 자체 테스트 기법)

  • Song Dong-Sup;Kang Sungho
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.42 no.12
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    • pp.79-90
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    • 2005
  • In this paper, we propose a new clustered reconfigurable interconnect network (CRIN) BIST to improve the embedding probabilities of random-pattern-resistant-patterns. The proposed method uses a scan-cell reordering technique based on the signal probabilities of given test cubes and specific hardware blocks that increases the embedding probabilities of care bit clustered scan chain test cubes. We have developed a simulated annealing based algorithm that maximizes the embedding probabilities of scan chain test cubes to reorder scan cells, and an iterative algorithm for synthesizing the CRIN hardware. Experimental results demonstrate that the proposed CRIN BIST technique achieves complete fault coverage with lower storage requirement and shorter testing time in comparison with the conventional methods.

An Improved Timing-level Gate-delay Calculation Algorithm (개선된 타이밍 수준 게이트 지연 계산 알고리즘)

  • Kim, Boo-Sung;Kim, Seok-Yoon
    • Journal of the Korean Institute of Telematics and Electronics C
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    • v.36C no.8
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    • pp.1-9
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    • 1999
  • Timing-level circuit analyses are used to obtain fast and accurate results, and the analysis of gate and interconnect delay is necessary to validate the correctness of circuit design. This paper proposes an efficient algorithm which simultaneously calculates the gate delay and the transition time of linearized voltage source for subsequent interconnect delay calculation. The notion of effective capacitance is used to calculate the gate delay and the transition time of linearized voltage source which considers the on-resistance of driving gate. The procedure for obtaining the gate delay and the transition time of linearized voltage source has been developed through an iterative operation using the precharacterized data of gates. While previous methods require extra information for the transition time calculation of linearized voltage sources, our method uses the derived data during the gate delay calculation process, which does not require any change in the precharacterization process.

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Estimation of the property of small underwater target using the mono-static sonar (단상태 소나를 이용한 소형 수중표적 물성추정)

  • Bae, Ho Seuk;Kim, Wan-Jin;Lee, Da-Woon;Chung, Wookeen
    • The Journal of the Acoustical Society of Korea
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    • v.36 no.5
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    • pp.293-299
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    • 2017
  • Small unmanned platforms maneuvering underwater are the key naval future forces, utilized as the asymmetric power in war. As a method of detecting and identifying such platforms, we introduce a property estimation technique based on an iterative numerical analysis. The property estimation technique can estimate not only the position of a target but also its physical properties. Moreover, it will have a potential in detecting and classifying still target or multiple targets. In this study, we have conducted the property estimation of an small underwater target using the data acquired from the lake experiment. As a result, it shows that the properties of a small platform may be roughly estimated from the in site data even using one channel.

Regression models for interval-censored semi-competing risks data with missing intermediate transition status (중간 사건이 결측되었거나 구간 중도절단된 준 경쟁 위험 자료에 대한 회귀모형)

  • Kim, Jinheum;Kim, Jayoun
    • The Korean Journal of Applied Statistics
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    • v.29 no.7
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    • pp.1311-1327
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    • 2016
  • We propose a multi-state model for analyzing semi-competing risks data with interval-censored or missing intermediate events. This model is an extension of the 'illness-death model', which composes three states, such as 'healthy', 'diseased', and 'dead'. The state of 'diseased' can be considered as an intermediate event. Two more states are added into the illness-death model to describe missing events caused by a loss of follow-up before the end of the study. One of them is a state of 'LTF', representing a lost-to-follow-up, and the other is an unobservable state that represents the intermediate event experienced after LTF occurred. Given covariates, we employ the Cox proportional hazards model with a normal frailty and construct a full likelihood to estimate transition intensities between states in the multi-state model. Marginalization of the full likelihood is completed using the adaptive Gaussian quadrature, and the optimal solution of the regression parameters is achieved through the iterative Newton-Raphson algorithm. Simulation studies are carried out to investigate the finite-sample performance of the proposed estimation procedure in terms of the empirical coverage probability of the true regression parameter. Our proposed method is also illustrated with the dataset adapted from Helmer et al. (2001).

Mechanical Behavior of Cable Net Structures Considering Sag Ratio (새그 비를 고려한 케이블 네트 구조물의 역학적 거동)

  • Park, Kang-Geun;Lee, Dong-Woo
    • Journal of Korean Association for Spatial Structures
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    • v.16 no.3
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    • pp.47-58
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    • 2016
  • Cable network system is a flexible lightweight structure which curved cables can transmit only tensile forces. The weight of cable roof dramatically can reduce when the length becomes large. The cable network system is too flexible, most cable systems are stabilized by pretension forces. The tensile force of cable system is greatly influenced by the sag ratio and pretension forces. Determining initial sag ratio of cable roof system is essential in a design process of cable structures. Final sag ratio and pretension depends on initial installed sag and on proper handling during installation. The design shape of cable system has an affect on the sag and pretension, and must be determined using well-defined design philosophy. This paper is carried out the comparative data of the deflection and tensile forces on the geometric non-linear analysis of cable network systems according to sag ratio. The study of cable network system is provided to technical informations for the design of a large span cable roof, analytical results are compared with the results of other researchers. Structural nonlinear analysis of systems having cable elements is relatively complex than other rigid structural systems because displacements are large as a reason of flexibility, initial prestress is applied to cables in order to increase the rigidity, and then divergence of nonlinear analysis occurs rather frequently. Therefore, cable network systems do not exhibit a typical nonlinear behavior, iterative method that can handle geometric nonlinearities are necessary.

Repeated Cropping based on Deep Learning for Photo Re-composition (사진 구도 개선을 위한 딥러닝 기반 반복적 크롭핑)

  • Hong, Eunbin;Jeon, Junho;Lee, Seungyong
    • Journal of KIISE
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    • v.43 no.12
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    • pp.1356-1364
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    • 2016
  • This paper proposes a novel aesthetic photo recomposition method using a deep convolutional neural network (DCNN). Previous recomposition approaches define the aesthetic score of photo composition based on the distribution of salient objects, and enhance the photo composition by maximizing the score. These methods suffer from heavy computational overheads, and often fail to enhance the composition because their optimization depends on the performance of existing salient object detection algorithms. Unlike previous approaches, we address the photo recomposition problem by utilizing DCNN, which shows remarkable performance in object detection and recognition. DCNN is used to iteratively predict cropping directions for a given photo, thus generating an aesthetically enhanced photo in terms of composition. Experimental results and user study show that the proposed framework can automatically crop the photo to follow specific composition guidelines, such as the rule of thirds.

Anti Air Warfare analysis & Design of the Patrol Killer Experiment Combat System by the Model-Based-Simulation (모델 기반의 시뮬레이션 기법을 이용한 차기 고속정(Patrol Killer Experiment)용 전투체계 대공전 기능의 분석 및 설계)

  • Hwang, Kun-Chul
    • Journal of the Korea Society for Simulation
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    • v.16 no.4
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    • pp.23-31
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    • 2007
  • Anti-Air Warfare(AAW) functionality of the naval combat system is the key functionality to ensure the ship's survivability. We have applied a novel method using model-based-simulation to analyze and design AAW functionality of the Patrol Killer Experimemnt Combat System. In this approach, an AAW functional model is described with the FSM(Finite State Machine) and directly executed for the AAW simulation. After prototyping using model based simulation, Hardware In Loop Simulation(HILS) is conducted as the AAW functionality is interfaced with the other ones of the combat system for completing the integration of the system components. This incremental and iterative development approach based on the model based simulation can minimize the development risks and costs caused by the system complexity for military system, bringing out the merit of the rapid prototyping.

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Efficient Exploration of On-chip Bus Architectures and Memory Allocation (온 칩 버스 구조와 메모리 할당에 대한 효율적인 설계 공간 탐색)

  • Kim Sungcham;Im Chaeseok;Ha Soonhoi
    • Journal of KIISE:Computer Systems and Theory
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    • v.32 no.2
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    • pp.55-67
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    • 2005
  • Separation between computation and communication in system design allows the system designer to explore the communication architecture independently of component selection and mapping. In this paper we present an iterative two-step exploration methodology for bus-based on-chip communication architecture and memory allocation, assuming that memory traces from the processing elements are given from the mapping stage. The proposed method uses a static performance estimation technique to reduce the large design space drastically and quickly, and applies a trace-driven simulation technique to the reduced set of design candidates for accurate Performance estimation. Since local memory traffics as well as shared memory traffics are involved in bus contention, memory allocation is considered as an important axis of the design space in our technique. The viability and efficiency of the proposed methodology arc validated by two real -life examples, 4-channel digital video recorder (DVR) and an equalizer for OFDM DVB-T receiver.

The Experience of Reorganization of the Everyday Lives among Middle-aged Women with Hwabyung (화병을 가진 중년여성의 일상생활 재편성 경험)

  • Park, Yeong-Sook;Chae, Sun-Ok;Yang, Jinhyang
    • The Journal of the Korea Contents Association
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    • v.17 no.6
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    • pp.239-249
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    • 2017
  • This ethnography was done to understand the daily lives and life values of the experience of middle-aged women with Hwabyung. It also focused on how they reorganized their lives to escape their crisis and how they continued living going forward. The participants were 5 middle-aged women with Hwabyung and 2 family members in K city. Data were collected from iterative fieldwork through in-depth interviews and participant observations. Data were analyzed using text analysis and taxonomic method. The reorganization of the everyday lives of participants with Hwabyung started from the perception of family values and the crisis of those values failing. The participants' everyday lives were reconstructed by changing their perspectives on life, and renewing their family relationships. In addition, middle-aged women with Hwabyung managed to cope with their own roles, fill in for the role of husband, and reinforce their capacities. Their children' attitudes and behaviors were also reshaped due to the rearrangement of family roles. These results may help nurses understand and provide culture specific care for the middle-age women with Hwabyung.

Developing statistical models and constructing clinical systems for analyzing semi-competing risks data produced from medicine, public heath, and epidemiology (의료, 보건, 역학 분야에서 생산되는 준경쟁적 위험자료를 분석하기 위한 통계적 모형의 개발과 임상분석시스템 구축을 위한 연구)

  • Kim, Jinheum
    • The Korean Journal of Applied Statistics
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    • v.33 no.4
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    • pp.379-393
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    • 2020
  • A terminal event such as death may censor an intermediate event such as relapse, but not vice versa in semi-competing risks data, which is often seen in medicine, public health, and epidemiology. We propose a Weibull regression model with a normal frailty to analyze semi-competing risks data when all three transition times of the illness-death model are possibly interval-censored. We construct the conditional likelihood separately depending on the types of subjects: still alive with or without the intermediate event, dead with or without the intermediate event, and dead with the intermediate event missing. Optimal parameter estimates are obtained from the iterative quasi-Newton algorithm after the marginalization of the full likelihood using the adaptive importance sampling. We illustrate the proposed method with extensive simulation studies and PAQUID (Personnes Agées Quid) data.