• Title/Summary/Keyword: Safe design

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Development of a safe operation capability chart as the design basis of a rudder area

  • You, Youngjun;Kim, Sewon;Kim, Woojin
    • International Journal of Naval Architecture and Ocean Engineering
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    • v.10 no.5
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    • pp.529-544
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    • 2018
  • Ship owners now demand a new design approach for the rudder that considers detailed design information such as maneuverability and environmental loads etc. on a quantified basis. In this paper, we developed the concept of a safe operation capability chart for the design of a rudder area. The chart can be used as the basis of design considering the maneuverability and environmental loads. To confirm the applicability of the safe operation capability chart for use as the basis of design, four different rudders are assumed in this work. First, it is determined whether or not it is appropriate to design a rudder by applying a conventional design approach based on IMO maneuvering tests. The proposed concept is reviewed for use as the basis of the design by investigating the effect of rudder area on capability charts that are plotted according to the rudder under various environmental conditions.

The Design of Fail-Safe Comparator by HDL (HDL을 이용한 고장안전(Fail-Safe) 인터페이스 설계)

  • 양성현;백순흠
    • Journal of the Korea Computer Industry Society
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    • v.2 no.6
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    • pp.803-816
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    • 2001
  • This paper presents the design of strongly fail-safe interface which transform binary signals, generated by fault-tolerant system into fail-safe signals. The strongly fail-safe property is achived by means of self-checking techniques. It can be shown for this interface to be integreated while the conventional fail-safe interface require using discrete components. This paper also presents the new implementation methods by the definitions for fail-safe system.

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A study on controller design based on safe Petri Net for discrite system control (비연속시스템제어를 위한 Safe Petri Net에 기초로한 제어기의 구성에 관한 연구)

  • 황창선;이재민
    • 제어로봇시스템학회:학술대회논문집
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    • 1990.10a
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    • pp.400-405
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    • 1990
  • This paper deals with the design technique of the controller for the discrete system control using Extended Safe Petri Net which is deduced from Petri Net as its subclass with a specific constraint and which is introduced to develop the design and analysis for the discrete systems. First, we propose a construction matrix suitable for the discrete systems that represent the marking flows which are the dynamic behavior of the discrete systems. Next, we develop a method that can design the controller for the discrete system control by analyzing the proposed construction matrix into the incidence matrix of Extended Safe Petri Net. Finally, the validity of the proposed method is shown by using the incidence matrix and matrix equation of Extended Safe Petri Net model.

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Service Experience Design Using CPTED: Location-Based Safe Return Home Assistance Application (셉테드(CPTED)를 이용한 서비스 경험디자인: 위치기반 안전 귀가 보조 어플리케이션 개발)

  • Chung, HaeKyung;Ko, JangHyok
    • Journal of the Semiconductor & Display Technology
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    • v.20 no.1
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    • pp.48-53
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    • 2021
  • The purpose of this study is to establish a crime prevention system through the Crime Prevention Through Environmental Design (CPTED). The research method went through the double diamond process and discovered the user's needs through the persona analysis. The most representative features are the functions that informs users of the safe and optimal route, checks the presence of streetlights or cctvs in real time to update them, and allows people with similar routs to return home together. It is a function to help safe return home with the help of an autonomous method, and a self-defense function to protect themselves. Therefore, the application presented in this study was intended to be of great help when actually returning home by adding these new functions. In particular, we help users to return home most safely by recommending the best safe route. Through the persona analysis, research method which we had chosen, the needs of users were discovered and implemented in a design that reflected those needs and requirements.

A Study on Expressing the Methods of Light for Creating Safe Space (안전한 공간 조성을 위한 빛의 표현방안 연구)

  • Kim, Myoung-Seon;Moon, Jeong-Min
    • Journal of the Korean housing association
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    • v.27 no.3
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    • pp.39-46
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    • 2016
  • On account of the increasing crime rates annually and the consequent rising anxiety, safety has become an important topic in the aspect of environmental formation to provide decent lives to urban dwellers. As a result, great emphasis has been placed in the importance of Crime Prevention through Environmental Design (CPTED), a design method which utilizes physical environmental design to prevent crime. The definition of CPTED encompasses the technological level of crime prevention as well as comprehensive environmental design which takes into consideration fear or terror in view of human recognition and emotion. However, the current application method of CPTED in Korea is still limited to the technical supplementation of facilities, such as CCTV and streetlight, and fragmental modification like village mural paintings. Moreover, the guideline for CPTED in Korea is only a theoretical adaptation of foreign books and does not offer sufficient studies for a practical design method that will improve the life of city dwellers. The purpose of this study is to examine design methods for safe environment construction in accordance with the changing concept of CPTED by understanding the characteristic of space and analyzing the how the methods of light are expressed. This study aims to provide basic material which will serve as a guideline in creating a safe environment in the future.

A Study on the Structural Design in Automatic Transport System (자동반송장치의 구조설계에 관한 연구)

  • 김홍건
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 1998.03a
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    • pp.258-262
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    • 1998
  • A structural design based of finite element analysis has been performed to investigate the reliable automatic transport system. For the procedure, different cross-sectional geometric factors were calculated and compared in detail. The von-Mises stresses were chosen to maintain a solid loading braring capacity for the safe design. Parametric studies showed that it is more inportant for the plate bending problem than the vertical loads of hanging bar to assess the safe and economic structural design.

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Development of extended safe petri net model for discrete system control and scanning algorithm for real time control (비연속 시스템 제어를 위한 확장된 safe petri net 모델과 실시간제어를 위한 scanning algorithm의 개발)

  • 황창선;서정일;이재만
    • 제어로봇시스템학회:학술대회논문집
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    • 1988.10a
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    • pp.338-342
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    • 1988
  • Recently, in sequence control systems, high flexibility and maintenance of control software are required. This is because product life cycles become shorter and control specification must be changed frequently. The authors extend the concept of Safe Petri Net to develop the design and analysis tool for sequence control systems taking the safeness and notation of input/output functions into consideration. Extended Safe Petri Net (S-Net) is proposed as such a new graph model and real time scanning algorithm based on S-Net is developed.

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Ignition Safe-Arm-Unit Using Micro-Electromechanical Systems (MEMS를 이용한 추진기관 점화안전장치)

  • Jang, Seung-Gyo;Lee, Sang-Hun;Chang, Hyun-Kee
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2009.11a
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    • pp.282-285
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    • 2009
  • Ignition Safe-Arm-Unit using micro-electromechanical systems(MEMS) for propulsion system was designed and manufactured. MEMS was designed according to the design schemes for conventional mechanical elements. By comparing the design results and the test data of the prototype, small discrepancy was found, which is due to the nonlinear characteristic of the structure and the machining accuracy. The applicability of MEMS for Safe-Arm-Unit was proved by testing MEMS which is assembled into SAU.

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A Study on Safety Assessment and Design of the Safe Task in Automated Man-Machine System (자동생산체계에서 인간-기계 시스템의 안전도측정과 안전작업설계에 관한 연구)

  • 오영진
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.13 no.22
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    • pp.71-78
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    • 1990
  • Some problems to assess the safety of automated man-machine system are studied in many ways. The difficulty occurred in this system is the vagueness of human behavior. Fuzzy set theory is used to assess the human behavior in safety analysis. The unsafe behavior listed top 10 in accident statistics would be explained as the factors of human vagueness. Three cases are considered, which consist of man-machine system as man-man, man-machine, machine-machine types. For the design of safe task, using characteristics of work performance, each motion cycle time is required to know the rate of learning. Approach of human behavior to the standard motion means more safe motion. It is important to design the works as to minimize the time performance to the standard motion's, which utilize the control of risk potential with easy. In that process, use of fuzzy set theory is appropriate to analyze the human behavior to identify its vagueness.

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A Study on the Structural Safety Analysis for Vinyl House at Snow Load (비닐하우스의 적설하중 구조안전성 검토에 관한 연구)

  • Paik, Shinwon
    • Journal of the Korean Society of Safety
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    • v.34 no.2
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    • pp.34-39
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    • 2019
  • Vinyl house consists of main rafter, lateral member, clamps and polyethylene film. Many vinyl houses are used in the countryside to grow vegetables. These vinyl houses have occasionally been collapsed due to heavy snowfall in winter. Many farmers get a lot of economical damages, if vinyl houses are collapsed. So it is most important to built a safe vinyl house that can withstand heavy snowfall. In this study, a structural analysis was performed on three types of vinyl houses(07-single-01, 10-single-04, 12-single-01). In addition, the structural analysis of the three types of vinyl houses provided axial forces, flexural moment, and combined stress. For these three types of vinyl houses, structural safety was reviewed by obtaining the combined stress ratio by the strength design method. This structural review showed that the specifications for the vinyl house proposed in the design are not safe. Especially, the result of increasing the design snow load by 15 percent and 30 percent showed that the vinyl house structure constructed as a standard for vinyl house was a more dangerous structure. Therefore, it is necessary to revise regulations such as increasing the thickness of rafters or widening the gap in order to make vinyl houses structurally safe for heavy snowfall in the future, and to devise diverse methods to make vinyl houses that are structurally safe.