• Title/Summary/Keyword: Process Flow Diagram

Search Result 118, Processing Time 0.031 seconds

A Study on Reliability Flow Diagram Development of Chemical Process Using Directed Graph Analysis Methodology (유향그래프 분석기법을 이용한 화학공정의 신뢰도흐름도 개발에 관한 연구)

  • Byun, Yoon Sup;Hwang, Kyu Suk
    • Journal of the Korean Institute of Gas
    • /
    • v.16 no.6
    • /
    • pp.41-47
    • /
    • 2012
  • There are PFD(Process Flow Diagram) and P&ID(Piping and Instrument Diagram) for designing and managing chemical process efficiently. They provide the operation condition and equipment specifications of chemical process, but they do not provide the reliability of chemical process. Therefore, in this study, Reliability Flow Diagram(RFD) which provide the cycle and time of preventive maintenance has been developed using Directed Graph Analysis methodology. Directed Graph Analysis methodology is capable of assessing the reliability of chemical process. It models chemical process into Directed Graph with nodes and arcs and assesses the reliability of normal operation of chemical process by assessing Directed Graph sequential. In this paper, the chemical process reliability transition according to operation time was assessed. And then, Reliability Flow Diagram has been developed by inserting the result into P&ID. Like PFD and P&ID, Reliability Flow Diagram provide valuable and useful information for the design and management of chemical process.

Applications of Product Process Analysis For Improving the Construction Process of Structural Steel

  • Lee Seung-Hyun
    • Korean Journal of Construction Engineering and Management
    • /
    • v.5 no.5 s.21
    • /
    • pp.101-108
    • /
    • 2004
  • A construction process consists of value adding activities and non-value adding activities, necessary or unnecessary. If construction personnel can eliminate inefficient and/or unnecessary activities within the process, they may have a great opportunity to improve their construction process. The Product Process Analysis (PPA) technique, which was developed in the manufacturing industry, can be applied for identifying wastes in the construction process and ultimately improving the process itself. It provides useful tools, such as a process chart worksheet and flow diagram, for mapping the flow of construction activities with predetermined standardized symbols. These tools make people understand the flow of activities more easily, identify value adding/non-value adding activities within the process, and areas where the process can be improved. The example applications of PPA are demonstrated in the paper through the case studies implemented on the construction process of structural steel. The results of case studies indicate that PPA technique was effective at identifying and removing wastes in the steel construction process. It is also found that PPA technique is more effective for improving highly repetitive construction processes.

A Design Methodology of Relational Database Schema Without the Conceptual Design Step (개념적 설계를 배제한 관계형 데이터베이스 스키마의 설계)

  • Um Yoon-Sup
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.9 no.2
    • /
    • pp.445-453
    • /
    • 2005
  • The design process of a relational database system consists of requirement analysis, conceptual design using ER diagram, logical design, and physical design. In logical design process, the conceptual schema is transformed to relational schema, and relational schema is normalized. This traditional design process is hard to applied in real database design process, since there is an ambiguity in conceptual design process. In this paper, we suggest a new design process, which provides more structural design steps by removing the conceptual design process. In new approach, we produce the data flow diagram by the structural methodology. From the attributes in the data store of data flow diagram, we construct relational table schema, and we normalize relational schema. Finally we produced table relationship diagram in order to figure out relationships between tables.

A Tool for Transformation of Analysis to Design in Structured Software Development

  • Park, Sung-Joo;Lee, Yang-Kyu
    • Journal of Korean Institute of Industrial Engineers
    • /
    • v.14 no.2
    • /
    • pp.71-80
    • /
    • 1988
  • The primary purpose of this study is to develop an automation tool capable of converting the specification of structured analysis into that of structured design. Structured Analysis and Structured Design Language (SASDL) is a computer-aided description language based on ERA model and particulariged by ISLDM/SEM. The automation tool utilizes the specifications of data flow diagram described in SASDL to produce their corresponding SASDL specification of structure chart. The main idea behind the automatic conversion process is to categorize the bubbles in data flow diagram and to determine the positions of the bubbles in structure chart according to their categories and the relative locations in data flow diagram. To make the problem into manageable size, the whole system is broken down into separate parts called activity units. A great deal of manual jobs, such as checking processes leveling, checking data derivation of processes, deriving structure chart from data flow diagram, checking any inconsistency between data flow diagram and structure chart and so forth, can be automated by using SASDL and conversion tool. The specification of structure chart derived by conversion tool may be used in an initial step of design to be refined by SASDL users.

  • PDF

Program Development for Drawing of 26 Properties and System Analysis on T-s Diagram of Water or Vapor (물의 T-s 선도 상에서 26 종류의 물성치 작도 및 시스템 해석 프로그램 개발)

  • Kim, Deok-Jin
    • Proceedings of the SAREK Conference
    • /
    • 2008.11a
    • /
    • pp.157-164
    • /
    • 2008
  • The temperature-entropy diagram of water or vapor displays graphically the thermophysical properties, so it is very conveniently used in various thermal systems. On general T-s chart of water, there are temperature, pressure, quality, specific volume, specific enthalpy, specific entropy. However, various state and process values besides above properties can be plotted on T-s diagram. In this study, we developed the software drawing twenty six kinds of properties, that is temperature, pressure, quality, specific volume, specific internal energy, specific enthalpy, specific entropy, specific exergy, exergy ratio, density, isobaric specific heat, isochoric specific heat, ratio of specific heat, coefficient of viscosity, kinematic coefficient of viscosity, thermal conductivity, prandtl number, ion product, static dielectric constant, isentropic exponent, velocity of sound, joule-thomson coefficient, pressure coefficient, volumetric coefficient of expansion, isentropic compressibility, and isothermal compressibility. Also, this software can analyze and print the system values of mass flow rate, volume flow rate, internal energy flow rate, enthalpy flow rate, entropy flow rate, exergy flow rate, heat flow rate, power output, power efficiency, and reversible work. Additionally, this software support the functions such as MS-Power Point.

  • PDF

An Object-Oriented Process Modeling for the Development of the Integrated Logistics Support (민간부문에서의 ILS 개발에 관한 연구 - 객체지향 물류 프로세스 모델링의 응용을 중심으로)

  • 고일상;김재전
    • The Journal of Society for e-Business Studies
    • /
    • v.3 no.2
    • /
    • pp.179-202
    • /
    • 1998
  • This study reviews the concept of Integrated Logistic Support(ILS), ILS standards, ILS elements, and the processes of developing ILS elements and Logistics Support Analysis(LSA). It also examines the potentials of applying ILS development process to building CALS systems in commercial sectors in order to accomplish business process innovation and achieve life-cycle cost savings in product and equipment management. In order to utilize the ILS approach for commercial industries, we need customizing the process of Logistics Support Analysis defined in MIL-STD-1388-lA. The success of ILS implementation depends on the determination of the range of ILS elements in relation with the application environment, and the appropriate development of those elements. During the development process, in order to analyze and design logistics flow processes and supporting activities, we suggest the object-oriented logistics process modeling approach with basic concepts and constructs embedded in objects. Several diagrams including Class Diagram, Class-Instance Diagram, and Integrated Instance Diagram, are provided. Simple Steps to follow are suggested for the analysis and design of inter-organizational logistics flow and support processes. The outcomes of the study are expected to contribute to stimulating the utilization of ILS concepts and development process during building commercial CALS systems.

  • PDF

Relationship Analysis of Field Work in Beam-Column System Frame Work of the Precast Concrete Public Apartment Building (보-기둥구조 PC공동주택 골조공사 작업관계 분석)

  • Kim, Ki-Ho;Kim, Jin-Won;Kim, MIn-Jun;Lee, Dong-Gun;Sohn, Jeong-Rak;Lee, Bum-Sik
    • Proceedings of the Korean Institute of Building Construction Conference
    • /
    • 2022.11a
    • /
    • pp.41-42
    • /
    • 2022
  • This study analyzed the process related to the linkage between on-site work targeting the middle size Precast Concrete(PC) public apartment building with beam-column system and prepared on-site works flow relationship diagram in which the wet process consists of core Critical Path(CP) to prepare a network diagram of the Precedence Diagram Method(PDM). Through this study, it is expected that it will be possible to maximize the project management capability by suggesting a method to minimize risk factors and the optimized process management of the beam-column system PC public apartment building.

  • PDF

A Study on the Requirements Allocation and Tracking by Implementing Functional Analysis (기능분석을 이용한 항공기 설계요구의 할당 및 추적에 관한 연구)

  • 이재우
    • Journal of the Korea Institute of Military Science and Technology
    • /
    • v.2 no.2
    • /
    • pp.52-60
    • /
    • 1999
  • By implementing the Systems Engineering process for the aircraft preliminary design, functional analysis study is performed, hence Functional Interface Data Flow(FIDF) and Functional Flow Block Diagram(FFBD) are generated. Based on FIDF and FFBD, allocable and non-allocable design/performance/RM&S requirements are allocated to the appropriate levels. Weight and cost tracking and design margin management methodologies are studied and implemented for the balanced aircraft design.

  • PDF

A Design Methodology of Relational Database Based on Dataflow Diagram (자료흐름도에 기반한 관계형 데이터베이스의 설계방법)

  • 엄윤섭;권중장;정희석;김창동
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
    • /
    • 2003.10a
    • /
    • pp.615-618
    • /
    • 2003
  • The design process of a relational database system consists of requirement analysis, conceptual design using ER diagram, logical design, and physical design. In logical design process, the conceptual schema is transformed to relational schema, and relational schema is normalized. This traditional design process is hard to applied in real database design process, since there is an ambiguity in conceptual design process. In this paper, we suggest a new design process, which provides more structural design steps by removing the conceptual design process. In new approach, we produce the data flow diagram by the structural methodology. From the attributes in the data store of data flow diagram, we construct relational table schema, and we normalize relational schema. Finally we produced table relationship diagram in order to figure out relationships between tables.

  • PDF

Simulation model for Francis and Reversible Pump Turbines

  • Nielsen, Torbjorn K.
    • International Journal of Fluid Machinery and Systems
    • /
    • v.8 no.3
    • /
    • pp.169-182
    • /
    • 2015
  • When simulating the dynamic behaviour of a hydro power plant, it is essential to have a good representation of the turbine behaviour. The pressure transients in the system occurs because the flow changes, which the turbine defines. The flow through the turbine is a function of the pressure, the speed of rotation and the wicket gate opening and is, most often described in a performance diagram or Hill diagram. In the Hill diagram, the efficiency is drawn like contour lines, hence the name. A turbines Hill diagram is obtained by performance tests on scaled model in a laboratory. However, system dynamic simulations have to be performed in the early stage of a project, before the turbine manufacturer has been chosen and the Hill diagram is known. Therefore one have to rely on diagrams for a turbine with similar speed number. The Hill diagram is drawn through measured points, so for using the diagram in a simulation program, one have to iterate in the diagram based on curve fitting of the measured points. This paper describes an alternative method. By means of the Euler turbine equation, it is possible to set up two differential equations which represents the turbine performance with good enough accuracy for the dynamic simulations. The only input is the turbine's main geometry, the runner blade in- and outlet angle and the guide vane angle at best efficiency point of operation (BEP). In the paper, simulated turbine characteristics for a high head Francis turbine, and for a reversible pump turbine are compared with laboratory measured characteristics.