• Title/Summary/Keyword: Trade-off

Search Result 1,357, Processing Time 0.024 seconds

Optimal trade-off filters for Noise Robustness, Peak Sharpness and Light Efficiency in the Nonoverlapping Background Noise (배경이 물체에 겹치지 않는 영상에서 잡음에 대한 안정성, 출력의 최대값 크기, 광효율을 고려한 최적 Trade-off 필터)

  • Seong, Yeong-Kyeong;Choi, Tae-Sun
    • Journal of the Institute of Electronics Engineers of Korea SP
    • /
    • v.37 no.4
    • /
    • pp.56-64
    • /
    • 2000
  • The design of filters for pattern recognition that have optimal trade-off for the criteria of noise robustness, peak sharpness and Homer efficiency, when input scene noise is spatially disjoint (nonoverlapping) with the target, are presented Three different criteria, ie, signal-to-noise ratio, peak-to-output energy ratio and light efficiency are used to design the filter. Computer simulation is made for the various types of noise and parameters to illustrate filter performance for optical pattern recognition. When we compare the new trade-off filter with the original optimal trade-off filter, the performance of trade-off filter for nonoverlapping background is better than that of trade-off filter for overlapping background.

  • PDF

Finite Element Model Updating Using Satisficing Trade-off Method (Satisficing Trade-off 방법을 이용한 유한요소 모델 개선)

  • Kim, Gyeong-Ho;Park, Youn-Sik
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2002.11b
    • /
    • pp.295-300
    • /
    • 2002
  • In conventional model updating using single-objective optimization techniques, incompatible physical data are compared with each other using weighting factors. There are no general rules for selecting the weighting factors since they are not directly related with the dynamic behavior of an updated model. So one of the most difficult tasks, in model updating study, is 'balancing among the correlations' i.e. 'trade-off'. In this work, a multiobjecitive optimization technique called 'satisficing trade-off method' is introduced to extremize several correlations simultaneously. The absurd need for the weighting factors can be avoided using this technique. And the updated model with the most appropriate correlations is obtained easily in interactive way. Especially automatic trade-off is employed to increase the rate of convergence to the desired model. Its effectiveness is verified by application to a real engineering problem, HDD cover model updating.

  • PDF

Time-Cost Trade-Off by Lead-Time Adjustment in the PDM Network

  • Kim, Seon-Gyoo
    • Architectural research
    • /
    • v.11 no.2
    • /
    • pp.43-49
    • /
    • 2009
  • Since the late 1980s, the schedule technique applied to the construction industry around the world has rapidly changed from the traditional ADM (Arrow Diagramming Method) to the PDM (Precedence Diagramming Method) technique. The main reason for this change is to overcome the limits and inconveniences of the traditional ADM technique. The time-cost trade-off is one of the core scheduling techniques to establish the best optimized combination plan in terms of a relationship between the cost and schedule. However, most of the schedule-related textbooks and research papers have discussed and proposed applications of a time-cost trade-off technique based only on the Finish to Start relationship. Therefore, there are almost no consideration and discussion of problems or restrictions that emerge when the time-cost trade-off technique is applied to the PDM network that has overlapping relationships. This paper proposes the lead-time adjustment method as a methodology for overcoming some restrictions that are encountered when the time-cost trade-off technique is applied to the overlapping relationships of the PDM network.

A Trade-off Image Fusion Technique Using Fast Intensity-Hue-Saturation Transform (Fast IHS 변환을 이용한 trade-off 영상 융합기법)

  • Kim, Yong-Hyun;Kim, Youn-Soo
    • Aerospace Engineering and Technology
    • /
    • v.8 no.2
    • /
    • pp.26-32
    • /
    • 2009
  • In the satellite image fusion, the most important point is to preserve both the spatial detail of panchromatic(PAN) image and the spectral information of multispectral(MS) image. Among various image fusion techniques, fusion technique using Intensity-Hue-Saturation(IHS) transform is widely used and it has advantage that computation is very simple. In this study, a fusion technique using fast IHS transform and trade-off parameter $\alpha^i$ proposed. Proposed fusion technique permits customization of the trade-off between the spectral information and spatial detail quality of the fused image through the evaluation of two quality indices: a spectral index(the spectral ERGAS) and a spatial one(the spatial ERGAS). Based on the result of experiment using IKONOS image, we confirmed the proposed fusion technique was more effective in preserving spatial detail and spectral information than existing fusion techniques using fast IHS transform.

  • PDF

Finite Element Model Updating Using Satisficing Trade-Off Method (Satisficing Trade-Off 방법을 이용한 유한요소 모델 개선)

  • Kim, Gyeong-Ho;Park, Youn-sik
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2002.11a
    • /
    • pp.334.2-334
    • /
    • 2002
  • In conventional model updating using single-objective optimization techniques, imcompatible physical data are compared with each other using weighting factors. There are no general rules fur selecting the weighting factors since they are not directly related with the dynamic behavior of an updated model. So one of the most difficult tasks, in mr)del updating study, is 'balancing among the correlations', i.e. 'trade-off'. (omitted)

  • PDF

An Analysis of Ecosystem Service's trade-off through Systems Thinking (시스템 사고를 통한 생태계서비스의 trade-off 관계 고찰)

  • Ham, Eun Kyung;Kim, Min;Chon, Jinhyung
    • Korean System Dynamics Review
    • /
    • v.16 no.2
    • /
    • pp.75-100
    • /
    • 2015
  • The purpose of this study is to analyze causation of Ecosystem service's trade-off(ES trade-off) and to establish baseline data for wise spatial planning and management. In order to understand why and how ES trade-off occurs, systems thinking and causal loops were employed. The causal loop of ecosystem service creation cycle includes profits quantification process, decision making process, spatial planning and management process, and ecosystem services creation process. The profits quantification process has a limitation that all ecosystem service categories were not included in profits quantification, because quantification method for cultural services is insufficient. These problems led to unequal discussion opportunity in decision making process. ES trade-off occurs through transition of ecosystem function in spatial scale and temporal scale. In spatial scale, land-use variation and resource-use variation contribute to change an ecosystem function for different ES category by spatial planning and management. In temporal scale, a change of an ecosystem function for different ES category is influenced by ecological succession, seasonal change and land cover variation, which are parameter from environmental features. This study presented that spatial planning and management should ecosystem service assessment in order to enhance balanced ecosystem services.

Application of Response Analysis to Trade-off Methods for the Conceptual Design of Armored Vehicle (장갑차량의 개념설계를 위한 대안분석에서의 응답표면분석법 적용)

  • 신용석;이희각;김진우
    • Journal of the Korea Institute of Military Science and Technology
    • /
    • v.2 no.2
    • /
    • pp.24-29
    • /
    • 1999
  • The purpose of this study is to develop a method of applying response surface analysis to trade-off techniques for the conceptual design of armored vehicle. The problem areas of concern are the use of this method in the selection of optimum design points when user requirements are in conflict. The application of this method to trade-offs of performance parameters in terms of weight are presented.

  • PDF

How to Use an Optimization-Based Method Capable of Balancing Safety, Reliability, and Weight in an Aircraft Design Process

  • Johansson, Cristina;Derelov, Micael;Olvander, Johan
    • Nuclear Engineering and Technology
    • /
    • v.49 no.2
    • /
    • pp.404-410
    • /
    • 2017
  • In order to help decision-makers in the early design phase to improve and make more cost-efficient system safety and reliability baselines of aircraft design concepts, a method (Multi-objective Optimization for Safety and Reliability Trade-off) that is able to handle trade-offs such as system safety, system reliability, and other characteristics, for instance weight and cost, is used. Multi-objective Optimization for Safety and Reliability Trade-off has been developed and implemented at SAAB Aeronautics. The aim of this paper is to demonstrate how the implemented method might work to aid the selection of optimal design alternatives. The method is a three-step method: step 1 involves the modelling of each considered target, step 2 is optimization, and step 3 is the visualization and selection of results (results processing). The analysis is performed within Architecture Design and Preliminary Design steps, according to the company's Product Development Process. The lessons learned regarding the use of the implemented trade-off method in the three cases are presented. The results are a handful of solutions, a basis to aid in the selection of a design alternative. While the implementation of the trade-off method is performed for companies, there is nothing to prevent adapting this method, with minimal modifications, for use in other industrial applications.

Capital Structure and Trade-Off Theory: Evidence from Vietnam

  • KHOA, Bui Thanh;THAI, Duy Tung
    • The Journal of Asian Finance, Economics and Business
    • /
    • v.8 no.1
    • /
    • pp.45-52
    • /
    • 2021
  • The capital structure is one of the hot financial topics among researchers and scholars. Its importance comes from the fact that capital structure is closely related to companies' ability to meet different stakeholders' needs. A suitable capital structure will boost the business and create a competitive advantage in the context of fierce competition. Many companies choose an optimal debt level based on the trade-off between interest and debt costs. This study aimed to test the existence of trade-off theory in capital structure, the case of Vietnam's real estate companies, which are growing very fast recently. Instead of considering constant optimal leverage to test the trade-off model, we take advantage of the dynamic capital structure determined by growth opportunities, profitability, tax incentives, tangibility, liquidity, and firm size. The dynamic panel data regression was estimated by the system Generalized Method of Moment (Sys-GMM). The empirical evidence showed that real estate companies listed in the Vietnamese stock market might change their leverage toward a target capital structure determined by influential factors in a long-term perspective. In particular, the debt-to-asset ratio will change by approximately 14 percent, positively, in response to the difference between the current debt-to-asset ratio and the dynamic target debt-to-asset ratio.

A Study on Optimization Model of Time-Cost Trade-off Analysisusing Particle Swarm Optimization (Particle Swarm Optimization을 이용한 공기-비용 절충관계 최적화 모델에 관한 연구)

  • Park, U-Yeol;An, Sung-Hoon
    • Journal of the Korea Institute of Building Construction
    • /
    • v.8 no.6
    • /
    • pp.91-98
    • /
    • 2008
  • It is time-consuming and difficulty to solve the time-cost trade-off problems, as there are trade-offs between time and cost to complete the activities in construction projects and this problems do not have unique solutions. Typically, heuristic methods, mathematical models and GA models has been used to solve this problems. As heuristic methods and mathematical models are have weakness in solving the time-cost trade-off problems, GA based model has been studied widely in recent. This paper suggests the time-cost trade-off optimization algorithm using particle swarm optimization. The traditional particle swarm optimization model is modified to generate optimal tradeoffs among construction time and cost efficiently. An application example is analyzed to illustrate the use of the suggested algorithm and demonstrate its capabilities in generating optimal tradeoffs among construction time and cost. Future applications of the model are suggested in the conclusion.