• Title, Summary, Keyword: stage design

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A Study on Design Additional Fee Estimation by Change Order - Focused on Design Stage - (설계변경에 따른 설계추가용역비 산정에 관한 연구 - 설계단계 중심으로 -)

  • Park, Won-Ho;Paek, Joon-Hong
    • Proceedings of the Korean Institute of Building Construction Conference
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    • pp.155-158
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    • 2009
  • During the construction project period, a lot of change orders happen in the design and construction stage Especially, The change order during construction stage causes the huge construction cost increase and duration delay. Accordingly, research on the change order of the construction stage is being progressed relatively active in the design stage, but the design changes are rarely made. In the design stage, the owner has to pay a design addition cost when change order due to the demands of owner happens. However Korea has not the specific standard about design additional cost in design stage. Therefore, this study analyzes problems of design additional cost estimation methods through the case study, and then indicates the method that the ratio distributes to details dividing design tasks and the method of the PM(Project Management). Eventually, this study expects to minimize claim related the design additional cost in design stage.

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Development of Design System for Multi-Stage Gear Drives Using Simulated Annealing Algorithm (시뮬레이티드 어닐링을 이용한 다단 치차장치의 설계 시스템 개발)

  • 정태형
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • pp.464-469
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    • 1999
  • Recently, the need for designing multi-stage gear drive has been increased as the hear drives are used more in the applications with high-speed and small volume. The design of multi-stage gear drives includes not only dimensional design but also configuration design of various machine elements. Until now, however, the researches on the design of gear drives are mainly focused on the single-stage gear drives and the design practices for multi-stage gear drives, especially in configuration design activity, mainly depend on the experiences and 'sense' of the designer by trial and error. We propose a design algorithm to automate the dimension design and the configuration design of multi-stage gear drives. The design process consists of four steps. The number of stage should be determined in the first step. In second step, the gear ratios of each reduction stage are determined using random search, and the ratios are basic input for the dimension design of gears, which is performed by the exhaustive search in third step. The designs of gears are guaranteed by the pitting resistance and bending strength rating practices by AGMA rating formulas. In configuration design, the positions of gears are determined to minimize the volume of gearbox using simulated annealing algorithm. The effectiveness of the algorithm is assured by the design example of a 4-stage gear drive.

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A Design Procedure for a Multi-Stage Axial Compressor Using the Stage-Stacking Method (단축적방법을 이용한 다단 축류압축기의 설계)

  • 강동진
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.18 no.6
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    • pp.1598-1603
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    • 1994
  • A preliminary design procedure for a multi-stage axial compressor is developed, which is based on the stage-stacking method. It determines the flow coefficient which gives rise to the design conditions required such as pressure ratio, mass flow rate and rotational speed for a given specific mass flow rate at inlet to a compressor. With this flow coefficient, blade radii, every stage and compressor performance characterics such as stage pressure ratio, adiabatic efficiency etc. are calculated by stacking each stage performance characteristics. It is shown that there is an optimum number of stage which results in the maximum of compressor overall efficiency for a given specific mass flow rate at inlet to a compressor. A test design was tried for three different geometric design constraints, and comparison with a previous study shows that present procedure could be used reliably in determining the number of compressor stage in preliminary design stage.

Development of a Design System for Multi-Stage Gear Drives Considering Configuration Design (배치설계를 고려한 다단 기어장치 설계 시스템 개발)

  • 정태형;김지철;배인호
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • pp.398-403
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    • 2000
  • The design of multi-stage gear drives is a time-consuming process that includes additional design problems, which are not considered in the design of single-stage gear drives. In the previous research works, the authors have proposed a new algorithm to design multi-stage gear drives at the preliminary design phase. The proposed design algorithm automates the design process by integrating the dimensional design and the configuration design process. In the configuration design process, the positions of gears and shafts are determined by minimizing the geometrical volume (size) of a gearbox. However, various types of spatial constraints should be satisfied in practical design situation. To locate input and output shaft in specified positions is the typical example of such problems. In this paper, the authors show the formulations of spatial constraints applied to the design of four-stage gear drives. The design solution shows considerably good results, and the design system is confirmed to be readily applicable to practical design situation.

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A Study on the Stage Lighting Design by the Type of Performance Hall (극장 형태에 따른 무대조명 디자인 기법에 관한 연구)

  • Lee, Jang-Weon;Kim, Myung-Nam
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • pp.224-229
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    • 2009
  • A Study on the Stage Lighting Design by the Type of Performance Hall The purpose of this study is to inquire into the practice of lighting design which is changed by type of stage Proscenium Stage, Thrust Stage, Arena Stage, and Flexible Stage, which have originated from ancient Greek theatre and are still used in contemporary theatre. This studt takes a good at the practical application of lighting design to different types of stage, through which it is expected to improve the understanding of lighting as a part of performing arts and to develop the quality of stage arts. The way of lighting design by type of stage can be acstracted as the following. This is expected to be of a great help to stage arts as well as different lighting designs for each type of stage. The methodology of lighting design might have limits in its application to practice in the current war Id where theatre structures and lighting equipments are fast-developing and ever-changing. However, lighting design can develop based on the basic design concepts as the researches of all fields can develop by applying their basic theories.

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Phase II two-stage single-arm clinical trials for testing toxicity levels

  • Kim, Seongho;Wong, Weng Kee
    • Communications for Statistical Applications and Methods
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    • v.26 no.2
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    • pp.163-173
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    • 2019
  • Simon's two-stage designs are frequently used in phase II single-arm trials for efficacy studies. A concern of safety studies is too many patients who experience an adverse event. We show that Simon's two-stage designs for efficacy studies can be similarly used to design a two-stage safety study by modifying some of the design parameters. Given the type I and II error rates and the proportion of adverse events experienced in the first stage cohort, we prescribe a procedure whether to terminate the trial or proceed with a stage 2 trial by recruiting additional patients. We study the relationship between a two-stage design with a safety endpoint and an efficacy endpoint as well as use simulation studies to ascertain their properties. We provide a real-life application and a free R package gen2stage to facilitate direct use of two-stage designs in a safety study.

The Designs of Stage Costume for 'Media Children's English Musical, The Magic Flute' ('미디어 어린이 영어뮤지컬 마술피리' 무대의상 디자인)

  • Lee, Ji-Hye;Kim, Yang-Hee
    • Journal of the Korean Society of Costume
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    • v.64 no.7
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    • pp.114-127
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    • 2014
  • Performing arts offer fun and knowledge and are directed for various purposes. Performing arts are also used as a means for education. Children's English media musical, 'The Magic Flute' is the performance reflecting all these. The author of this study took part in stage costume production, and this study was carried out aiming at designing and producing stage costume in line with educational purpose and intention. This study consists of an analysis stage for the existing performances of 'The Magic Flute', and a stage costume design and production stage for children's English media musical, 'The Magic Flute', First, this study classified and analyzed the stage design and stage costume design of the existing 'The Magic Flute' by concept, and then, examined their features, respectively. and this study unfolded the stage costume concept, based on the analyses of existing performance's stage costume and the characters' personality and features described in the current study subject's script. As the last step of this study made each character's stage costume. A total of 69 costumes for stage costume were made for 7 types of characters. This study is considered to have huge significance in that the stage costume was developed for 'The Magic Flute'.

Generation and Preliminary Design of Compound Multi-Stage Gear Drive Mechanisms (복합 다단 기어장치 메커니즘의 생성 및 초기설계)

  • 정태형;김장수;박승현
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • pp.53-58
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    • 2003
  • In recent years, the need for multi-stage gear drives, which highly reduce output speed, has been increased. However, the design of multi-stage gear drives have been carried out by a limited number of experts. The consideration for the direction of input and output axes also makes their design very difficult. The purpose of this study is to develop an algorithm for automatically generating complex multi-stage gear drives and to implement a design supporting system for multi-stage gear drives. There are 4 stages in the proposed algorithm, and major design parameters,.such as the direction of input and output axes, reduction ratio, etc. are set up in the first stage. In the second stage, all mechanisms are generated, and various rules are applied to select feasible mechanisms. In the third stage, the gear ratio of each stage is divided from total gear ratio. Next, the specifications of gears for feasible mechanisms are calculated and their bending strength and surface durability are estimated. In the forth stage, appraised indexes are calculated and provided to support the estimation of the generated gear drives.

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Generation and Preliminary Design of Compound Multi-Stage Gear Drive Mechanisms (복합 다단 기어장치 메커니즘의 생성 및 초기설계)

  • Chong Tae-Hyong;Kim Jang-Soo;Park Seung-Hyun
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.14 no.4
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    • pp.41-48
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    • 2005
  • In recent years, the need for multi-stage gear drives which highly reduce output speed has been increased. However, the design of multi-stage gear drives has been carried out by a limited number of experts. The consideration for the direction of input and output axes also makes their design very difficult. The purpose of this study is to develop an algorithm for automatically generating complex multi-stage gear drives and to implement a design supporting system for multi-stage gear drives. There are 4 stages in the proposed algorithm, and major design parameters, such as the direction of input and output axes, reduction ratio, etc. are set up in the first stage. In the second stage, all mechanisms are generated, and various rules are applied to select feasible mechanisms. In the third stage, the gear ratio of each stage is divided from total gear ratio. Next, the specifications of gears for feasible mechanisms are calculated and their bending strength and surface durability are estimated. In the forth stage, appraised indexes are calculated and provided to support the estimation of the generated gear drives.

Development of STAGE-GATE based Evaluation Index for the Improvement of Design Quality of Plant Material (플랜트 기자재 설계품질 향상을 위한 STAGE-GATE 기반 평가항목 개발)

  • Lee, In Tae;Baek, Dong Hyun
    • Journal of the Society of Korea Industrial and Systems Engineering
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    • v.43 no.2
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    • pp.65-71
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    • 2020
  • Worldwide plant market keeps maintaining steady growth rate and along with this trend, domestic plant market and its contractors also maintain such growing tendency. However, in spite of its external growth, win-win growth of domestic material industry that occupies the biggest share in plant industry cost portion is extremely marginal in reality. Domestic plant material suppliers are required to increase awareness of domestic material brand by securing quality and reliability of international standard through improvement of design quality superior to that of overseas material suppliers. Improvement of design quality of plant material becomes an essential element, not an option, for survival of domestic plant industry and its suppliers. Under this background, in this study, priority and importance by each evaluation index was analyzed by materializing plant design stage through survey of experts and defining evaluation index by each design stage and based on this analysis result, evaluation index of stage-gate based decision-making process that may improve design quality of plant material was suggested. It is considered that by utilizing evaluation index of stage-gate based decision-making process being suggested in this study, effective and efficient decision-making of project decision-makers would be enabled and it would be contributory to improve design quality of plant material.