• 한국관광식음료학회지:관광식음료경영연구
• /
• 제7권
• /
• pp.315-329
• /
• 1997

This study reviews the scientific management theories and discusses those theories within the food service industry. By providing the principles and the practical implications of this theories on the food service industry, this study tries to identify their philosophies and usefulness to the industry so that the managers in the industry use them in their dynamic operations.

• 대한약학회:학술대회논문집
• /
• 대한약학회 2003년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.2-2
• /
• pp.118.2-118.2
• /
• 2003

Propofol(2, 6-diisopropylphenol) is rapid, short-acting intravenous anaesthetic agent. It is used for the induction and maintenance of general anaesthesia or sedation. The recommended doses are 2-2.5mg/kg given as a titration infusion over about 30min to achieve anaesthesia. Recently, we encountered 4 fatalities related to propofol. One death is a suicide by self-administered of propofol and the others are therapeutic misadventures during surgical care. The propofol level in the blood and tissues were determined by gas chromatographic analysis with mass spectral detection. (omitted)

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2004년도 추계학술대회 논문집
• /
• pp.328-333
• /
• 2004

With the introduction of KTX, in my view it is necessary to secure the reliability of high-speed trains, make them stabilized at the earliest moment possible, and completely digest them as our own system for the purpose of being second to none in the area of railroad business. I am going to study in this thesis through analysis of train failures by help of MKBSF calculation, breaking from the convention in maintaining the high-speed trains, in order to establish and apply the computerized system called as RCM (Reliability Centered Maintenance), foster manpower in charge of the reliability maintenance, and realize the scientific and efficient maintenance covering the whole field of maintenance. Depending on how efficiently and scientifically we can perform the maintenance activities, we will be able to not only reduce the maintenance cost but also ensure the railroad security, and as a natural consequence improve the railroad image much better.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2010년도 춘계학술대회 논문집
• /
• pp.1335-1344
• /
• 2010

도시철도는 시민을 빠르고 안전하게 수송하는 대중교통의 중심축이다. 도시철도차량의 유지보수는 고장 방지를 위한 예방정비의 개념이며 정해진 규정과 정비지침에 따라 시행되어야 한다. 신뢰성 있는 검수설비는 유지보수의 정확성과 전동차 운행의 정시성을 보장할 수 있다. 부산도시철도 전동차 검수용 검수설비를 자체 기술로 개발하여 활용한 사례 연구를 통해 유지보수 과학화와 전동차 안전운행 및 업무 효율 향상 방법을 고찰하고자 한다.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2008년도 추계학술대회 논문집
• /
• pp.1487-1493
• /
• 2008

Railway vehicle is very important to implement the effective maintenance in proper to prevent any failure during operation period. Many railway authorities are making efforts to maintain the railway vehicle through scientific and systematic procedure. To achieve this, Reliability Centered Maintenance(RCM) is partially applied. The efficiency of RCM has proven and its terminology was familiar with nuclear power, military and chemical plant etc. since the commercial aircraft's industries has introduced the maintenance program based on the target of reliability. The application of RCM on railway vehicle can be utilized with systematic analysis method to select the best effective maintenance period and action to prevent the failures by selecting the equipment affecting the its safety and reliability. This paper is presented that the procedure of adequate and effective maintenance for railway vehicle by comparing among the related standards in example IEC60300-3,11, MIL-STD-2173, and technical documents or papers. In accordance with above result, RCM procedure is proposed to apply effectively for maintenance of railway vehicle. That is, (1) Analysis of data and Calculation of criticality per equipment (2) Selection of equipment to analyze (3) Analysis of failure mode and effect (4) Evaluation of maintenance method and period (5) Optimization of maintenance program through renewal of maintenance method and period.

• 대한지구과학교육학회지
• /
• 제16권1호
• /
• pp.30-42
• /
• 2023

이 연구는 초등 예비교사들이 작성한 과학 일기를 양적·질적 분석하여 초등 예비교사들이 지닌 과학의 본성에 대한 관점의 특징과 그 변화 과정을 분석하여 범주화하는데 그 목적이 있다. 이를 위해 초등 예비교사 13명이 쓴 과학 일기 112편을 분석하였다. 수집된 자료는 과학의 본성 4가지 영역의 연구 개념틀을 이용하여 영역별 빈도수를 분석하였고, VNOS-C 검사 분석틀을 이용하여 과학의 본성에 대한 관점 변화 양상을 귀납적으로 도출하여 유형화하였다. 그 결과 초등 예비교사들이 작성한 과학 일기에 나타난 과학의 본성에 대한 관점은 과학의 사고적 본성, 지식적 본성, STS적 본성, 탐구적 본성은 비교적 비슷한 비율로 서술되었으나 그 중 과학의 사고적 본성이 가장 높은 비율로 나타났고, 과학의 탐구적 본성이 가장 낮은 비율로 기술되었다. 과학 지식의 가변성, 경험적 증거의 중요성, 과학의 긍정적·부정적 작용에 대해서는 특히 집중적으로 언급되었다. 또한 초등 예비교사들의 과학의 본성에 대한 관점 변화 양상은 '고전적 관점 유지형', '현대적 관점 유지형', '회귀형', '발전형', '혼재형'으로 유형화 할 수 있었다. '과학 지식의 경험적 본성' 요소는 학생에 따라 변화 양상이 다양한 유형으로 나타났고, 대부분의 학생들이 과학 지식의 잠정성에 대해서는 현대적 관점을 여러 회기 동안 유지하였다.

• Computers and Concrete
• /
• 제17권4호
• /
• pp.499-521
• /
• 2016

In this paper, a probabilistic- and finite element-based approach to evaluate and predict the lifetime performance of reinforced concrete (RC) bridges undergoing various maintenance actions is proposed with the time-variant system reliability being utilized as a performance indicator. Depending on their structural state during the degradation process, the classical maintenance actions for RC bridges are firstly categorized into four types: Preventive type I, Preventive type II, Strengthening and Replacement. Preventive type I is used to delay the onset of steel corrosion, Preventive type II can suppress the corrosion process of reinforcing steel, Strengthening is the application of various maintenance materials to improve the structural performance and Replacement is performed to restore the individual components or overall structure to their original conditions. The quantitative influence of these maintenance types on structural performance is investigated and the respective analysis modules are written and inputted into the computer program. Accordingly, the time-variant system reliability can be calculated by the use of Monte Carlo simulations and the updated the program. Finally, an existing RC continuous bridge located in Shanghai, China, is used as an illustrative example and the lifetime structural performance with and without each of the maintenance types are discussed. It is felt that the proposed approach can be applied to various RC bridges with different structural configurations, construction methods and environmental conditions.

• 한국소음진동공학회:학술대회논문집
• /
• 한국소음진동공학회 2007년도 춘계학술대회논문집
• /
• pp.453-456
• /
• 2007

The purpose of this study is to explain the importance of Vibration Monitoring Device by introducing an example of Predictive Maintenance System using Condition Monitoring System of Hydro-turbine generator. Confirming vibration of generation equipment is commissioning procedure during equipment completion for checking guaranteed items. Data from Generator output range are used to determine output band to continue the performance of equipment. The Vibration Monitoring System is not absolute method of maintenance, but if it is used well with expert, it will be visible, data-analyzed, scientific maintenance more than others. And also, Condition Monitoring System is very important for remote controlled small hydro-power plant although most of it is installed in Large hydro-power plant.

• 유체기계공업학회:학술대회논문집
• /
• 유체기계공업학회 2006년 제4회 한국유체공학학술대회 논문집
• /
• pp.57-60
• /
• 2006

The purpose of this study is to explain the importance of Vibration Monitoring Device by introducing an example of Predictive Maintenance System using Condition Monitoring System of Hydro-turbine generator. Confirming vibration of generation equipment is commissioning procedure during equipment completion for checking guaranteed items. Data from Generator output range are used to determine output band to continue the performance of equipment. The Vibration Monitoring System is not absolute method of maintenance, but if it is used well with expert, it will be visible, data-analyzed, scientific maintenance more than others. And also, Condition Monitoring System is very important for remote controlled small hydro-power plant although most of it is installed in Large hydro-power plant.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2007년도 춘계학술대회 논문집
• /
• pp.7-12
• /
• 2007

The component and system of modern Railroad vehicles are advanced and complex. Maintenance policy is scientific and must be performed systematic. A vehicle operation and maintenance must become statistical analysis method. We must apply RAMS and System Engineering. We must apply the RCM theory in the maintenance management. The vehicle failure and maintenance charge must be reduced to a minimum. When we purchase the vehicle or component, we must reflect the technology. Also such system must be constructed. We will do technique development with the deed of such serial.