• Title/Summary/Keyword: Operational Environment

Search Result 1,188, Processing Time 0.031 seconds

Diagnosing the Cause of Operational Faults in Machine Tools with an Open Architecture CNC

  • Kim Dong Hoon;Kim Sun Ho;Song Jun-Yeob
    • Journal of Mechanical Science and Technology
    • /
    • v.19 no.8
    • /
    • pp.1597-1610
    • /
    • 2005
  • The conventional computerized numerical controller (CNC) of machine tools has been increasingly replaced by a PC-based open architecture CNC (OAC) that is independent of a CNC vendor. The OAC and machine tools with an OAC have led to a convenient environment in which user-defined applications can be efficiently implemented within a CNC. This paper proposes a method of diagnosing the cause of operational faults. The method is based on the status of a programmable logic controller in machine tools with an OAC. An operational fault is defined as a disability that occurs during the normal operation of machine tools. Operational faults constitute more than 70 percent of all faults and are also unpredictable because most of them occur without any warning. To quickly and correctly diagnose the cause of an operational fault, two diagnostic models are proposed: the switching function and the step switching function. The cause of the fault is logically diagnosed through a fault diagnosis system using diagnostic models. A suitable interface environment between a CNC and developed application modules is constructed to implement the diagnostic functions in the CNC domain. The results of the diagnosis were displayed on a CNC monitor for machine operators and transmitted to a remote site through a Web browser. The proposed diagnostic method and its results were useful to unskilled machine operators and reduced the machine downtime.

An Analysis on GPS Jammer Operational Range Against GPS Receiver in Sea Environment (해상환경의 GPS 수신기에 대한 GPS 재머의 운용반경 분석)

  • Lee, Young-Joong;Park, Joo-Rae;Kim, Jong-Kyu
    • Journal of the Korea Institute of Military Science and Technology
    • /
    • v.14 no.2
    • /
    • pp.232-237
    • /
    • 2011
  • This paper analyzed the J/S of the GPS receiver in sea environment from GPS satellite and GPS jammer. Through the analysis, the operational range and effective radiation power of the GPS jammer could be estimated. In the case of the jammer effective radiation power is higher than the specific value, jammer height mainly resolves the jammer operational range.

The Development of Virtual Fire Control System Considering Operational Environment of Helicopter (헬기 운용환경을 고려한 가상 사격 통제 시스템 개발)

  • Kim, Woosik;Lee, Dongho;Jang, Indong;Park, Hanjoon
    • Journal of the Korea Institute of Military Science and Technology
    • /
    • v.17 no.4
    • /
    • pp.448-455
    • /
    • 2014
  • Virtual Fire Control System(VFCS) in attack helicopter is developed. VFCS is comprised of multifunction display, store management computer, mission computer, target acquisition and designation system, mission planning system, weapon simulator and flight simulator. Weapon engagement process under the operational environment of helicopter was considered by using the VFCS. We considered hellfire missile, tow missile, unguided rocket and turret gun. The results of this study will be utilized efficiently on integrated fire control system SIL(System Integration Lab.) in attack helicopter.

Operational Concept and Procedure for Land Navigation of Distributed Missile System (분산유도무기체계의 지상항법 운용 개념 및 절차 연구)

  • Ryu, Moo-Yong
    • Journal of the Korea Institute of Military Science and Technology
    • /
    • v.11 no.2
    • /
    • pp.66-72
    • /
    • 2008
  • A distributed missile system is composed of command control center, radar and launcher which exchange information each other to use wire or wireless network. The distributed missile system is required mobility for operational convenience and survivability. Also missile system requests land navigation system to provide relatively accurate attitude. For reason of these requirements, each subsystem needs land navigation which provides information of position and attitude. This paper represents operational concept for land navigation to consider operational environment and concrete operational procedure to apply the operational concept. In state that there is no operation for land navigation of distributed missile system internally so for, this paper could be helped to establish operational concept and procedure of this kind of system.

The Role of Operational Absorptive Capacity on Supply Chain Risk

  • Jeong, EuiBeom
    • Journal of Korea Society of Industrial Information Systems
    • /
    • v.26 no.6
    • /
    • pp.61-80
    • /
    • 2021
  • As the business environment becomes more rapid and unpredictable change, greater diversity, increased complexity, and intensified competitive pressures, supply chain risk management has been growing attention over the past several decades. However, little of known about how absorptive capacity can mitigate supply chain risk for improving operational performance despite its important role in responding to supply chain risk. Therefore, we aim to examine the role of organizational-level absorptive capacity on operational performance, and further identify how the interplay of individual-level and organizational-level absorptive capacity results in operational performance. Our results represent not only direct but also indirect effects of supply chain risk on operational performance, mediated by organizational-level absorptive capacity. Furthermore, this study reveals that individual-level absorptive capacity enhances the effect of organizational-level absorptive capacity on operational performance.

Dynamic field monitoring data analysis of an ancient wooden building in seismic and operational environments

  • Lyu, Mengning;Zhu, Xinqun;Yang, Qingshan
    • Earthquakes and Structures
    • /
    • v.11 no.6
    • /
    • pp.1043-1060
    • /
    • 2016
  • The engineering background of this article is an ancient wooden building with extremely high historic and cultural values in Tibet. A full understanding of the dynamic behaviour of this historic building under in-service environments is the basis to assess the condition of the structure, especially its responses to earthquake, environmental and operational loading. A dynamic monitoring system has been installed in the building for over one year and the large amounts of high quality data have been obtained. The paper aims at studying the dynamic behaviour of the wooden building in seismic and operational conditions using the field monitoring data. Specifically the effects of earthquake and crowd loading on the structure's dynamic response are investigated. The monitoring data are decomposed into principal components using the Singular Spectrum Analysis (SSA) technique. The relationship between the average acceleration amplitude and frequencies of the principle components and operational conditions has been discussed. One main contribution is to understand the health condition of complex ancient building based on large databases collected on the field.

A Study on The Workforce Agility and Operational Performance of Distribution Center - Focused on Busan New Port Distripark - (인력의 민첩성과 물류센터의 운영성과에 관한 연구 - 부산 신항 항만배후단지를 중심으로 -)

  • Cho, Yang-Il;Kim, Seog-Soo
    • Korea Trade Review
    • /
    • v.44 no.3
    • /
    • pp.25-42
    • /
    • 2019
  • This research examined the mediation effect of Workforce Agility (WA) on the relationship between environmental uncertainty and operational performance. We manipulated the control variables that are known to be affected by employment flexibility. Employment flexibility is caused by idiosyncratic characteristics of Korean port system. The analysis was tested by Baron & Kenny's method. The result indicates that each path of the proposed model is significant. Furthermore, the mediation effect was checked with the Sobel Test. The research revealed that environment uncertainty poses an indirect effect on operational performance. Both supply/demand uncertainty and technological uncertainty affected operational performance through the mediation effect of WA. Most of the distribution centers located in Busan Newport Distripark are operated in a bimodal labor (human resource) system which includes both permanent employees (workers) and temporary employees (workers). This empirical research provides theoretical and managerial implications by suggesting ways to increase efficiency in distribution center operation through WA enhancement, and to improve the unloading labor system.

Development of a Real-time Ship Operational Efficiency Analysis Model (선박운항데이터 기반 실시간 선박운항효율 분석 모델 개발)

  • Taemin Hwang;Hyoseon Hwang;Ik-Hyun Youn
    • Journal of the Korean Society of Marine Environment & Safety
    • /
    • v.29 no.1
    • /
    • pp.60-66
    • /
    • 2023
  • Currently, the maritime industry is focusing on developing technologies that promote autonomy and intelligence, such as smart ships, autonomous ships, and eco-friendly technologies, to enhance ship operational efficiency. Many countries are conducting research on different methods to ensure ship safety while increasing operational efficiency. This study aims to develop a real-time ship operational efficiency analysis model using data analysis methods to address the current limitations of the present technologies in the real-time evaluation of operational efficiency. The model selected ship operational efficiency factors and ship operational condition factors to compare the operational efficiency of the ship with present and classified factors to determine whether the present ship operational efficiency is appropriate. The study involved selecting a target ship, collecting data, preprocessing data, and developing classification models. The results of the research were obtained by determining the improved ship operational efficiency based on the ship operational condition factors to support ship operators.

Establishment of an Operational Oceanographic System for Regional Seas around Korea (한반도 주변 해역 운용해양시스템 구축 방향)

  • Lee, Dong-Young;Park, Kwang-Soon;Shi, Jun
    • Ocean and Polar Research
    • /
    • v.31 no.4
    • /
    • pp.361-368
    • /
    • 2009
  • An operational oceanographic system needs to be established for the preservation and management of marine environments and resources, and also to secure the safety and efficiency of marine operations in Korea. One of the major roles of operational oceanography is to deliver ocean science products which can meet the requirements of users such as marine industries, the general public, government agencies, and scientific research communities. Technical issues in relation to development of an effective operational oceanographic system in Korea are identified and discussed. Among others, cooperation among the agencies in ocean, meteorology, hydrology and environment, and also among those of neighboring countries is important for the development of an effective operational oceanographic system. The strategy for building a system that meets the demands of users, with consideration to potential problems, are explored.

Requirement Analysis and Optimal Design of an Operational Change Detection Software

  • Lee, Young-Ran;Bang, Ki-In;Shin, Dong-Seok;Jeong, Soo;Kim, Kyung-Ok
    • Korean Journal of Remote Sensing
    • /
    • v.20 no.3
    • /
    • pp.189-196
    • /
    • 2004
  • This paper describes what an operational change detection tool requires and the software which was designed and developed according to the requirements. The top requirement for the application of the software to operational change detection was identified: minimization of false detections, missing detections and operational cost. In order to meet such a requirement, the software was designed with the concept that the ultimate decision and isolation of changes must be performed manually by visual interpretation and all automatic algorithms and/or visualization techniques must be defined as support functions. In addition, the modular structure of the proposed software enables the addition of a new support function with the minimum development cost and minimum change of the operational environment.