• Title, Summary, Keyword: Case Analysis

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Risk Analysis for Installation Types of Pressure Safety Valve used in the High-pressure Gas Facility (고압가스 사용시설 내 안전밸브 설치유형별 리스크 분석)

  • Kim, Myung-Chul;Woo, Jeong-Jae;Lee, Hyung-Sub;Baek, Jong-Bae
    • Journal of the Korean Society of Safety
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    • v.32 no.4
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    • pp.129-136
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    • 2017
  • This study investigated the probability of possible accident through qualitative and quantitative analysis of the pressure safety valve types installed in facilities using high pressure gas to compare the installation domestic and foreign pressure safety valve standards sought the safety characteristics and safety improvement direction accordingly. The three types are the case where the shut-off valve is not installed at the front of the PSV (Case A), If a shut-off valve is installed at the front of the PSV for inspection (Case B) and If a shut-off valve is installed in front of PSV (C.S.O), PSV is installed in parallel (Case C). Three types of cases were compared with FTA and HAZOP. The results of study of the possible accidents due to over-pressure safety valve installation type, used in a high-pressure gas facilities was shows in the following order Case B > Case A > Case C. The results of analysis through FTA was in order to protect the reservoir for the possible occurring of accident the safety valve installation is depend on its type. In the FTA analysis, defects in the device itself which attached to the storage tank as a substitute for analysis of the probability of operator mistakes was Case B with as high as $2.01{\times}10^{-6}$. Depending on the type of installation analysis of Case B in order to ensure safety is prohibited to install shut-off valve and believes that mandatory regulations are needed. Rationally installing of pressure safety valve in the high pressure using facilities will be expected to improve the industrial safety from severe accidents such as high-pressure gas fire explosion.

Design and implementation of simulator for fault coverage analysis of commuication protocol test case (통신 프로토콜 시험항목의 오류 발견 능력 분석을 위한 시뮬레이터의 설계 및 구현)

  • 김광현;허기택;이동호
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.22 no.8
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    • pp.1823-1832
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    • 1997
  • In this ppaer, fault coverage analysis of a conformance test case for communication protocols, specified as a deterministic finite state machine(DFSM) is presented. The fault coverage analysis of a test case is defined by measuring the extent of the faults detected using a generated test case. The method that evaluates fault coverage analysis for a test case, has been researched by arithmetic analysis and simulation. In this paper, we designed and implemented a simulator for fault coverage analysis of a communication protocol teat case. With this result for Inres protocol, output fault and state merge and split fault have a high fault coverage of 100%. This simulator can be widely used with new fault coverage analysis tools by applying it to various protocols.

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Scenario-based Goal-oriented Approach for Use Case Modeling (사용 사례 모델링을 위한 시나리오 기반의 목적 지향 접근법에 관한 연구)

  • Kim, Jeong-Wook;Park, Sooyong;Nam, Ki-Chan
    • Journal of the Korean Operations Research and Management Science Society
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    • v.28 no.2
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    • pp.91-103
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    • 2003
  • Use case modeling on UML (Unified Modeling Language) is getting widely used in OOAD and CBD and it is considered a useful technique in dealing with the complexity of the requirements analysis. However, some of the problems with use case modeling are that it is not structured, difficult to handle non-functional requirements, and to analyze impacts among use cases. To alleviate these problems, we propose a scenario-based goal-oriented approach for use case modeling. The proposed approach is to apply a goal-oriented analysis method to use case modeling. Since goal-oriented analysis method is not systematic and many heuristics are involved, we have adopted scenarios as the basis for goal extraction. The proposed method is applied to CBIS (City Bus Information Subsystem) in ITS (Intelligent Transportation System) domain. The proposed approach helps software engineers to analyze the impact among use cases and represent non-functional requirements.

Commonality and Variability Analysis Method for UML CASE Tool Frameworks (UML CASE 도구 프레임워크를 위한 공통성 및 가변성)

  • Choi, Hwan-Bok;Lee, Eun-Ser;Kim, Yun-Ho
    • The KIPS Transactions:PartD
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    • v.16D no.6
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    • pp.927-934
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    • 2009
  • This paper presents a commonality and variability analysis method for UML CASE tool frameworks. Commonality and Variability analysis increase extension and reusability by separating common area and variable area. We suggest class category based on property and the notation to represent commonality and variability. It is also implements frameworks based on analysis method and verify method using defect removal efficiency.

The study about Sasang Constitution diagnosis and research trends in the case reports (증례논문에 나타난 사상체질진단의 특징 및 연구동향에 대한 연구)

  • Ban, Duk-Jin;Lee, Seung-Yun;Park, Seong-Sik
    • Journal of Sasang Constitutional Medicine
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    • v.21 no.2
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    • pp.107-114
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    • 2009
  • 1. Objectives : We analyzed the case reports published by the journal of Sasang Constitutional Medicine, to study Sasang Constitution diagnosis and characteristic of clinical practice. 2. Methods : It has been examined 138 case reports of Sasang Constitution society published from 1994 to 2008. We analyzed. patient's number, publication year, distribution of Sasang Constitution, title's characteristics and bases of constitution diagnosis. 3. Results and conclusions : 1) In the analysis of patient's number, 1 case report was almost part of the case reports, and the case reports ware many published after 2001. 2) In the analysis distribution of Sasang Constitution, Soyangin was the most Sasang Constitution, and Tae-umin was the next one and Soeumin, Taeyangin followed them. 3) In the analysis of the journal's title, Sasang Constitution, disease and symptom of Sasang Constitution were more important than prescription recently. 4) In the analysis of the journal's purpose, unique disease and response of treatment were almost part of the case reports. 5) In the analysis of diagnosis bases, subjective bases were more important than objective bases and Sasang Constitutional drug response. therefore we should do researches in objective bases and drug response in the future.

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Content Analysis of Case Study Research on the Crisis Management in Korea (한국 위기관리분야 사례연구방법에 관한 내용분석)

  • Lee, Ju-Ho;Ahn, Hye-Won;Ryu, Sang-Il
    • The Journal of the Korea Contents Association
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    • v.12 no.2
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    • pp.284-291
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    • 2012
  • This study is to present development plan for next study on applying the method of case study by applying scientific inference focusing on analysis and generalization of case study or study question about the tendency of thesis for case study of the field of crisis management released since 2004. As the result of analysis, the study on crisis management of Korea is almost individual technical case study and it is rarely to get proper study which can contribute theoretical formation for development of individual course of crisis management. Furthermore researchers are required to study in-depth about study plan that presents organization of study or logic of case selection and formality for data analysis.

Modelling Technique and Model Analysis of Submerged Structures Using Finite Element Method and Boundary Element Method (유한요소법과 경계요소법을 이용한 수중에서의 탄성구조물의 진동모드해석 및 모델링 기법)

  • 김관주;오상륜
    • Journal of KSNVE
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    • v.10 no.2
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    • pp.319-324
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    • 2000
  • This paper shows hot to model the submerged elastic structures and adequate analysis tools for modal behavior when using finite element and boundary element method. Four different cases are reviewed depending on the location of the water and air. First case is that structures are filled with air and water is located outside. Second case is opposite to case one. These cases are solved by direct approach using collocation procedure. Third case is that water is located both sides of structures. Last case is that air is located both sides. These cases are solved by indirect approach using variational procedure. As analysis tools harmonic frequency sweep analysis and eigenvalue iteration method are selected to obtain the natural frequencies of vibrating submerged structures depending on the cases. Results are compared with closed form solutions of submerged spherical shell.

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Operation Deflection Shapes Analysis for Vibration Reduction of ATM Case (ODS 해석에 의한 ATM 케이스 진동 저감)

  • Shin, Bum-Sik;Lee, Seung-Mock;Kim, Do-Hyun;Choi, Yeon-Sun
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.232-237
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    • 2006
  • Operation deflection shapes(ODS) is defined as a motion of structure at particular frequency. The ODS is eligible to show any types of structural motions while the modes supply solutions only to linear and stationary motion. The principal vibration source of an auto teller machine(ATM) case was occurred due to resonance which was found by modal analysis. To reduce the vibration of ATM case, the motion of the case was visualized using ODS analysis, which can suggest how to modify the structure. As a result the vibration of the ATM case was greatly reduced with a stiffening bar between the opposite plates.

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Basic Analysis on Implementation Process of Case Management for Strengthening the Function of Grandparent and Grandchildren Family (조손가족 기능강화를 위한 사례관리 실천 과정 기초분석)

  • Park, Su-Sun
    • Journal of Korean Home Management Association
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    • v.31 no.2
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    • pp.41-57
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    • 2013
  • This paper analyzed the implementation process of experts managing the case of grandparent and grandchildren families in the case management process, as the useful approach to strengthen the function of grandparent and grandchildren family. The methodology were the analysis on 6 management cases by step and the analysis on the interview with 3 experts implementing the case management on grandparent and grandchildren families. As a result, major complaints from grandparent and grandchildren families were basic livelihood and economy area, physical and mental health area, child care and education area and culture area. The service goals were set by such classification and support service was provided using the internal and external resources. The case management process was effective for improving the satisfaction on life by positively changing the grandchildren and promoting the psychological and emotional stability. 6 cases were under the post management after the analysis was completed and linked to the program 'Reinforcement of Family Ability of Grandparent and Grandchildren Family.' In accordance with the interview with the experts in case management, the grandparent and grandchildren family case management was characterized by high dependency and difficulty in expressing the desires. They required the long-term approach as well as the approach to restore the relationship with the original family.

A Study on the Structural Analysis and Design Verification of Variable Swash Plate Piston Pump Case for Wheeled Armored Vehicle (차륜형 장갑차용 가변형 사판식 피스톤 펌프 케이스의 구조해석 및 설계검증에 관한 연구)

  • Choi, Seong Woong;Kim, Yong Seok;Yang, Soon Yong
    • Journal of Drive and Control
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    • v.16 no.2
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    • pp.43-50
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    • 2019
  • The objective of this study was to reverse engineer a swash plate type piston pump mounted on a wheeled armored vehicle and to analyze the structure of the pump case. From the analysis, the weak parts were identified and corrected in the final design. Each element corresponding to the piston pump case was analyzed. The analytical method was given static boundary conditions, load conditions and confirmed displacement, strain, stress, and safety factor. Plastic deformation and damage were also confirmed and the component elements redesigned through structural analysis Structural analysis and vibration analysis were carried out for the components of the piston pump case. The piston pump model was finally modified by structural analysis and vibration analysis results for each component assembly, and a prototype was designed. Durability test and environmental test were carried out and the test results satisfied all of the requirements. Therefore, the analytical method presented in this study can be utilized as a methodology for element component design in the development of various piston pumps.