• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1991년도 한국자동제어학술회의논문집(국내학술편); KOEX, Seoul; 22-24 Oct. 1991
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• pp.1057-1062
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• 1991

Recently, due to the development of new technology and products, FA has been accelerating for obtaining high-quality and saving of resources and power. Introduction of automation to the field which has bad working condition is needed and welding is one of these field. In this study, solving algorithm for down hand control which requires in the automatic are welding system is proposed. For the verification of the algorithm, numerical examples are shown and visualization is carried out using developed graphic tools.

• 산업경영시스템학회지
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• 제18권34호
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• pp.107-114
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• 1995

The objective of this study is to design a one-stage dynamic prediction model with Kalman state space model. For a model verification, it is compared with EWMA(Exponentially Weighed Moving Average) model. The model designed in this research can be extended to process prevention control and quality monitoring.

• 선박안전
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• 통권35호
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• pp.52-62
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• 2013

2012년 2월 5일을 기점으로 하여 소방검정 시스템에 대하여 전반적인 변화가 있었다. "소방시설 설치 유지 및 안전관리에 관한 법률" 개정시행과 동시에 행정안전부령인 "소방용 기계 기구의 형식승인 등에 관한 규칙"이 "소방용품의 품질관리에 관한 규칙"으로 명칭이 변경되었다. 이에 따라 제품검사방법에 제조업체에서 유통 전에 생산시마다 검사하는 생산제품검사와 제조업체의 품질관리에 따라 검사하는 품질제품검사를 도입하는 등 소방검정시스템이 크게 바뀌었으며 이에 따른 주요 변경사항과 소방검정시스템에 대하여 소개하고자 한다.

• 대한안전경영과학회:학술대회논문집
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• 대한안전경영과학회 2008년도 추계학술대회
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• pp.161-165
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• 2008

This paper introduces three continuous sampling plans by attribute. Revised KS standards for acceptance samplings such as KSA ISO 2859-3, 4 : 2001 and 21247 : 2007 are presented. These plans are based on skip-lot, DQL(Declared Quality Level) and VL (Verification Level).

• Nuclear Engineering and Technology
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• 제42권4호
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• pp.377-381
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• 2010

In 2007 the Nuclear Energy Agency's Committee on the Safety of Nuclear Installations published Best Practice Guidelines for the use of CFD in Nuclear Reactor Safety. This paper provides an overview of the document' contents and highlights a few of its recommendations. The document covers the full extent of a CFD analysis from initial problem definition and selection of an appropriate tool for the analysis, through final documentation of results. It provides advice on selection of appropriate simulation software, mesh construction, and selection of physical models. In addition it contains extensive discussion of the verification and validation process that should accompany any high-quality CFD analysis.

• Journal of Nutrition and Health
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• 제36권10호
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• pp.1071-1082
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• 2003

The objective of this study was to evaluate and improve the microbiological quality of HACCP application in school foodservice operations. The microbiological quality of foods and utensils were evaluated two times at each critical control point (CCP) with 3M petrifilm in five Daegu elementary schools. Two processes were evaluated: Heating process and after-heating process. The CCPs of the heating process were receiving, cooking and serving temperatures. The CCPs of the after-heating process were personal hygiene, cross contamination avoidance and serving temperature. After the first experiment, 31 employees of five schools were classroom educated, trained on-site, and pre- and post-tested on HACCP-based sanitation with the goal of improving the microbiological quality of the foodservice. Scores representing knowledge of holding, thawing, washing, food temperature, sanitizing and food-borne illness increased after education. In the heating process, internal food temperatures in the first and second experiments were higher than 74$^{\circ}C$, the holding temperature in the first experiment was less than 6$0^{\circ}C$. In the second experiment, the serving temperature improved to a satisfactory level. The microbiological quality in the second experiment improved by decreasing the time from cooking to serving. In the after-heating process, the ingredients were boiled before being cut in the first experiment. In the second experiment, ingredients were cut before being boiled, improving microbiological quality. Also in the second experiment, cooking just before serving food improved its microbiological quality through time-temperature control. These results strongly suggest it is essential to measure microbiological quality regularly and to educate employees on HACCP continuously, especially time-temperature control and cross contamination avoidance in order to improve foodservice quality.

• 보건의료산업학회지
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• 제8권3호
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• pp.157-168
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• 2014

The purpose of this study was to examine the effects of the Mindfulness Meditation program on sleep, depression and quality of life in the institutionalized elderly women. The study was a nonequivalent control group pretest-posttest design. The data was collected from March 7 to April 25 of 2014. Participants in the study were 56 elderly women, 30 institutionalized elderly for the experimental group and 26 institutionalized elderly for the control group. The experimental group received the Mindfulness Meditation program for 90 minutes/session/week for 8 weeks. Data were analyzed using x2-test and t-test for subject homogeneity verification, and paired t-test to examine the hypotheses. Mindfulness Meditation program experimental group showed significant differences in sleep score(t=-4.406, p=<.001), quality of life score(t=-8.799, p=<.001). However no significant differences were found between 2 groups for the scores on depression. According to the results the Mindfulness Meditation program was useful for improving on sleep and quality of life in the institutionalized elderly women.

• Bulletin of the Korean Chemical Society
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• 제31권5호
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• pp.1149-1154
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• 2010

Liquid chromatography/mass spectrometry using isotope dilution method has been established as a primary method for the measurement of cortisol in human serum. Verification of this method was accomplished by the participation in Consultative Committee for Amount of Substance-Metrology in Chemistry (CCQM) pilot study. Two levels of cortisol certified reference materials were prepared and certified by the established method. They were used as sample materials for the proficiency testing. The expanded uncertainty in the measurement of cortisol in human serum was approximately 1.2% at 95% confidence level. The results of the proficiency testing showed a good precision among the participants, but some bias to the certified values. This means that commercial field laboratories should keep traceability chain to SI unit through available reference measurement procedures and/or available reference materials.

• 디지털융복합연구
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• 제8권3호
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• pp.79-93
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• 2010

본 연구는 디지털교과서의 정보품질과 시스템품질이 학습만족도에 미치는 영향에서 인지양식 관련요인들, 특히 장의존 및 장독립적 요인이 조절효과를 가지는지 검증하고자 하였다. 연구대상은 서울광역시에서 거주하는 초등학교 5학년, 6학년학생들이다. 이러한 연구를 위해 현재 디지털교과서 연구시범학교에서 학습에 참여하고 있는 학습자 325명으로부터 자료를 얻어 실증적 연구를 수행하였다. 연구가설의 검증을 통해 나타난 결과는 다음과 같다. 디지털교과서의 학습만족이 정보품질과 시스템품질의 만족도에 영향력을 받을 때, 인지양식 변수들의 상호작용에 의해서 긍정적인 조절효과를 받고 있음이 확인되었다.

• 한국군사과학기술학회지
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• 제20권1호
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• pp.12-17
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• 2017

In this paper, causes of wear on high pressure seals for suspension are analyzed, and the result of reproduction test and verification on improved design are described. First, by performing the observation of worn surfaces and its failure analysis, the primary cause of wear on the seals are analyzed. The result of analysis shows that the main failure mechanism of wear is a fatigue wear, and test criteria for failure reproduction are set up with consideration for frequency condition, surface roughness and pressure. Durability comparison test on the condition of low amplitude and high frequency is carried out. And, it is found that the durability of wear on seals by increasing hardness of cylinder and managing for surface roughness is enhanced.