• 한국경영과학회지
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• 제36권4호
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• pp.143-160
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• 2011

In the marketing research area, service quality and customer satisfaction have been considered as ones of the most important marketing variables. However, there has been a lot of controversy over the direction of the casual relationship between the service quality and the customer satisfaction. The purpose of this study is to investigate the casual relationship between the service quality and the customer satisfaction. Granger's test of casuality method has been used to test the casuality relationship between two variables. In this paper, we applied the Granger's test of casuality method to KS-SQI and NCSI data of 17 business area which had been gathered annually. As the research result, we found that the customer satisfaction might cause the service quality in many service area.

• 품질경영학회지
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• 제23권4호
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• pp.52-57
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• 1995

Testing problem of equality between two linear regressions is considered. Chow test is discussed and likelihood ratio test(LR test), F-test and Score test are derived. Score test are compared with other tests and show they are asymptotically equivalent.

• 대한토목학회논문집
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• 제37권5호
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• pp.871-878
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• 2017

건설공사의 품질관리 관련자는 품질관리계획 또는 품질시험계획을 수립 및 시행하고 공정에 따라 사용 자재의 적격 여부 확인, 시험 검사 장비의 관리, 품질교육, 자체 품질점검 및 조치, 부적합 제품 공정에 대한 지도 관리 및 품질시험 등을 시행하고 부실공사를 방지하여 사고를 예방하는 중요한 역할을 담당하고 있다. 그러나 관련기관은 품질관리 관련자에 대하여 관련 법 규정의 개정 시 시험요원, 품질관리자 등으로 호칭을 변경하면서 품질시험과 품질관리 업무에 대한 역할분담을 명확하게 제시하지 않았으며, 건설공사의 품질관리비 산정 및 인건비 적용 등에 혼란을 유발하였다. 따라서 이를 개선하기 위한 연구가 필요하다. 본 연구에서는 품질관리 관련자에 대하여 모호한 호칭관계를 관련 법 규정 등을 토대로 건설공사의 요구사항을 충족할 수 있도록 개선하고, 각각의 역할 및 호칭에 대하여 '품질시험자'와 '품질관리자'로 구분한다. 즉, 건설공사 품질관리 업무지침에서 규정한 "건설공사 품질시험기준"의 품질시험을 실시하는 자를 '품질시험자'로, 건설기술 진흥법 시행규칙에서 규정하는 품질관리계획 수립 및 시행업무를 수행하는 자를 '품질관리자'로 호칭하도록 규정한다.

• 대한디지털의료영상학회논문지
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• 제12권2호
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• pp.71-79
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• 2010

Thanks to the great development of technology in radiation, we are now able to reduce radiation exposure to the patients, and the radiographer and expenses in medical sector. We are also trying to produce ideal images which maintain useful information. These kinds of effort are increasing over the world. For that reason, we should get images which include necessary data of patients. Then it also can help to reduce radiation exposure to the patients. Therefore, we need to know the problems that cause a falling off in image's quality and check on generator in case of their electronic and mechanical errors. And moreover, we should anticipate the possibility of devices errors and prevent them with regular quality control. This investigation was conducted in medical institutions, institute of educations and hospitals. They are all in Seongnam-City. We used PMX-III, kVp meter to implement kVp test, mR / mAs output test, light fiel / beam alignment test, Reproducibility of exposure dose, half value layer test, reproducibility of exposure time test. in the case of hospitals, they perceive the importance of regular quality control and organize the regular quality control team so they can be satisfied with the error standard in most experiments. On the other hand, when it comes to medical institutions and institute of educations, they perceive the importance of regular quality control less than hospitals do. Radiographer need to understand the importance of regular quality control and practice it so they can get the fine ideal image with the lower dose to the patient.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 추계학술대회 논문집
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• pp.172-178
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• 2007

The purpose of Railroad Vehicles License Management in accordance with the Railroad Safety Law is to improve the quality of railroad safety. And the train simulators come into use for training of train operation and testing to issue Railroad Vehicles License. So, It is very important that the simulators for the Railroad Vehicles License Test require to work correctly, to measure driver's operation quality in numerical system and to ensure the justice of license test. In fact, nobody can guarantee that the simulators are feasible performance to use in license test. The simulator for train driver license test can be used effectively for studying of needed performance and quality to test new driver's skill. This study hopefully provides the base for improving the quality of the simulator for train driver's license test and contributes furthermore to improve the simulator development technology and railroad safety.

• 한국자동차공학회논문집
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• 제22권4호
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• pp.145-151
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• 2014

Modern vehicle has a lot of ECU(Electronic Control Unit) products to control many parts such as engine, transmission, brake, body and so on. ECU quality is one of important factors related to vehicle quality and driver's safety. Based on Bath-tub curve which presents failure rate during product lifetime, we designed and applied Accelerated Run-in Test into manufacturing line by simulating stress amount to ECU and developing the required software and efficient test equipment for mass production. This test makes ECU products stressed through electrical and thermal stresses under excessive driving condition, which induce potential initial failure of components in the ECU during production. The outcome until these days proved that Acceleration Run-in Test have reduced initial failure rates and increased quality of ECU products in the field outstandingly.

• 정보처리학회논문지D
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• 제11D권3호
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• pp.659-670
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• 2004

임베니드 소프트웨어의 품질시험을 통해 임베디드 시스템 子매자늘의 요구에 부합되는 고품질의 시스템을 구현할 수 있다. 임베디드 소프트웨어의 경우, 아직까지 국내에서 활용할 수 있는 구체적인 품질시험 체계가 구축되어 있지 않은 실정이다. 최근 다양한 임베디드 시스템들이 개발되고 있으나 결함으로 인한 리콜 등 품질면에서 많은 문제점들이 노출되고 있다. 본 연구에서는 임베디드 소프트웨어 평가를 위해 ISO/IEC 12119를 근간으로 하여 품질시험을 수행할 수 있는 평가모듈과 품질검사표를 개발하여 임베디드 소프트웨어 평가에 적용할 수 있도록 하였다.

• 한국콘텐츠학회논문지
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• 제11권1호
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• pp.236-244
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• 2011

성능이 저하된 IVR 장치의 지속적 사용은 환자 및 시술자의 방사선 피폭을 증가시킬 뿐 아니라, 잘못된 영상정보를 제공함으로써 환자에게 심각한 영향을 끼칠 수 있다. 따라서 이번 연구에서는 IVR장치의 성능평가를 위한 적절한 시험방법 및 검사기준을 마련하고자 하였다. IVR장치의 국내현황 및 규격을 조사하였으며, 표준팬텀을 이용하여 국내 IVR장치의 성능을 현장 측정함으로써, 국내 실정에 맞는 적절한 IVR 장치의 화질 및 성능평가 기준을 설정하였다. 장치의 기본적 성능에 관한 검사를 위해 관전압시험, 관전류 시험, 반가층 시험을 실시하며, NEMA stndard XR-21 Phantom을 표준팬텀으로 사용하여 화질 및 선량 평가를 하도록 하였다. 표준팬텀을 이용한 검사항목은 image-field geometry, spatial resolution, low-contrast iodine detectability, wire resolution, phantom entrance dose이다. 또한 매일, 매주, 1개월, 3개월, 6개월 및 1년 주기의 평가항목을 설정하였다. 장치의 성능기준은 진단용방사선안전관리 규정을 준용하여 kVp시험은 평균오차 ${\pm}10%$, mA시험은 평균오차 ${\pm}15%$, 반가층시험은 80kVp에서 최소 2.3mmAl으로 설정하였다. 표준팬텀의 검사기준은 image-field geometry에서 최소 acceptable이 나와야 하며, spatial resolution은 Image Intensifier 나 detector 크기기준으로 34-40cm은 0.8 lp/mm, 28-33cm은 1.0lp/mm, 22-27cm은 1.2 lp/mm이상이 나와야 한다. low contrast iodine detectability는 최소농도 200mg/cc 이상 보여야 하며, phantom entrance dose는 10R/min을 초과해서는 안 된다. Wire resolution은 정지 상태에서 최소 0.012인치까지 보여야 하며, 움직일 때 최소 0.022인치까지 보여야 한다.

• 대한안전경영과학회:학술대회논문집
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• 대한안전경영과학회 2010년도 춘계학술대회
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• pp.231-237
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• 2010

The purpose of this study was to investigate the actual conditions of radiation safety supervision in animal clinics using quality assurance (QA) and quality control (QC) of diagnostic X-ray units. The surveys for QA/QC, equipment condition, and safety supervision were carried out in 18 animal clinics randomly. The QA/QC included reproducibility of dose exposure, kVp, mAs, collimator accuracy test, collimator luminance test, X-ray view box luminance test, grounding system equipment test and external leakage current test. As a result, 44.44% of reproducibility of dose exposure was proper, 81. 25% of kVp test was good, and 100% of mAs test was appropriate. Also, 66.66% of collimator accuracy test was proper, 61.11% of collimator luminance test was good, 53.13% of X-ray view box luminance test was suitable. In addition, only 5.55% of grounding system equipment and ground resistance was proper, 63.64% of external leakage current test was appropriate in grounding system equipment test.

• 한국군사과학기술학회지
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• 제22권6호
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• pp.784-796
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• 2019

As the size and complexity of software increases, it is important to ensure the quality of software through testing. Many organizations refer to international standards or test process models to improve the quality of software through establishing a systematic test process. However, these standards and process models provide general processes that do not reflect the characteristics of the domain or the organization's test policies and strategies. To establish a test process that reflects the characteristics of the organization, test policies and strategies based on the organization's quality objectives and the organizational and domain characteristics should be reflected. This study proposes specific methods for eliciting activities and information to establish organizational software test policies and strategies that are essential to establishing a test process that reflects the characteristics of the organization and the system.