• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.2013_2014
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• 2009

진단기술은 기기의 열화 현상 및 이상 현상으로 진전되는 특성을 측정하여 향후 발생이 예상되는 이상을 조기에 발견하는 것을 목적으로 한다. 기기를 정밀 진단, 분석하여 잔여 수명을 평가하고 적절한 대체계획을 수립함으로써 신뢰도 향상 및 경제적인 설비 운용이 가능하다. 본 논문에서는 수력 발전기 운전 중 부분방전 진단 시스템을 이용하여 수력 발전기의 운전 중에 발생하는 부분방전 신호를 실시간으로 측정, 분석하고 수력 발전기 권선의 절연 상태를 감시 진단하여 기기의 열화 및 이상 현상등을 조기에 발견하고 발전설비의 신뢰도를 향상시킬 수 있는 방안을 제시하고자 한다.

• Journal of Internet Computing and Services
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• v.12 no.3
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• pp.1-16
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• 2011

In this paper, we proposed the Failure-Diagnostic Context-awareness Middleware (FDCM) for improving the reliability in the USN application service. The middleware diagnoses the failure occurred in sensors or facilities in the indoor USN application system. The new middleware suggested in this paper consists of DataManagement module, ContextProvider module, Contextlnterpreter module, ServiceProvider module and DataStorage module. By analysing the data obtained by the interaction between modules through the diagnostic algorithm, the FDCM determines the malfunction of sensors and equipment devices. Then we verified the performance of middleware by using simulation. As a result, the FDCM showed the high performance in the large systems that many of the sensors and devices are installed.

• Journal of the Korean Society of Propulsion Engineers
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• v.12 no.3
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• pp.60-67
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• 2008

In this study, the genetic algorithm has been used for the real-time defect diagnosis on the operation of the aircraft gas-turbine engine. The component elements of the gas-turbine engine for consideration of the performance deterioration consist of the compressor, the gas generation turbine and the power turbine. Compared to the on-design point, the teaming data has been increased 200 times in case off-design conditions for the altitude, the flight mach number and the fuel consumption. Therefore, enormous learning time has been required for the satisfied convergence. The optimal division has been proposed for learning time decrease as well as the high accuracy. As results, the RMS errors of the defect diagnosis using the genetic algorithm have been confirmed under 5 %.

• Journal of the Korean Vacuum Society
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• v.14 no.3
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• pp.110-114
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• 2005

This study proposes an accurate method of monitoring precursor consumption in chemical vapor deposition (CVD) systems. Since precursor costs are significant, finding an efficient method to monitor precursor consumption is necessary One example is the use of non-contact and inexpensive ultrasonic sensors for determining the liquid level in a container. In this study, sensors based on ultrasonic techniques have been developed for monitoring the precursor consumption in a CVD system. Moreover, the prototype sensors developed in this study can be useful in the field of semiconductors.

• The Korean Journal of Nuclear Medicine
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• v.21 no.1
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• pp.69-73
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• 1987

외상에 의한 횡경막파열은 신속한 진단이 매우 어렵다. 이는 임상증상 및 일반적인 방사선학적 소견이 특이성이 없고, 많은 다른 외상이 동반되어 임상적으로나 방사선학적으로 진단하기 힘들기 때문이다. 더우기 외상성 청경막파열은 좌측에 비해 우측에서는 매우 드물다. 저자들은 임상경사와 단순 흉부-X선 사진상에서 진단이 어려웠던 우측 외상성 횡경막 파열등 3예에 매해서 간신티그램을 시행하여 몇가지 특징적 소견을 관찰할 수 있었다. 즉 간신티그램 상에서 관찰된 횡경막파열의 특징적인 소견은 1) 청경막 탈출에 의한 간우엽의 융기 2) 융기부 기저부의 예각형성 그리고 3) 횡경막교약에 의한 띠모양의 냉소이었다. 그러나 이들 3가지 소견은 반드시 모두가 나타나지 않을 뿐만 아니라 같은 환자에서도 신티영상의 촬영방향에 따라 나타나는 수도 있고 나타나지 않을 수도 있었다. 그러므로 우측 횡경막내 외상성파열로 인한 간 등의 허니아를 진단하기 위해서는 다각도로 신티영상 촬영을 하여야 할 것이다.

• Journal of the Korea Convergence Society
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• v.3 no.4
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• pp.15-21
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• 2012

Image segmentation for object to extract data from ultrasound acquired is an essential preprocessing step for the effective diagnosis. Various image segmentation methods have been studied. In this study, interactive image segmentation method by graph cut algorithm is proposed to develop a variety of applications of vascular ultrasound imaging and diagnostics. General imaging and vascular ultrasound imaging segmentation by entering constrain condition such as foreground and background. In the future it will be able to develop new ultrasound diagnostics.

• Proceedings of the KIEE Conference
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• 2001.07d
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• pp.2190-2192
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• 2001

가스 배관 진단 시스템은 배관 내부에 삽입되어 배관 내에 주입된 가스에 의해 추진되는 시스템으로 배관의 건설, 유지, 보수, 해체 등의 작업을 위한 여러 정보를 수집한다. 배관 진단을 위한 대표적인 센서로는 배관 내부의 찌그러짐(dent)과 주름(wrinkle)의 형태 및 크기를 측정하는 캘리퍼(caliper) 센서와 배관 외부의 파손을 측정하는 MFL(Magnetic Flus Leakage) 센서 그리고 배관 내의 환경 정보를 측정하기 위한 온도 센서와 압력 센서가 있다. 이러한 센서들로 수집된 정보를 활용하기 위해서는 정확한 위치 정보가 필요하므로 IMU(Inertial Measurement Unit)와 주행 거리계를 사용하는 결합 항법 시스템도 필요하다. 본 논문에서는 가스 배관 진단 시스템을 위한 항법 데이터 저장 시스템을 개발한다. 배관 진단 시스템의 특성상 일반적인 측정 센서는 700Hz 이상의 주기로 측정되고 항법 정보는 100Hz 주기 이상으로 측정되며 배관 내 이동 시간은 2시간에서 24시간 이상으로 다양하므로 많은 데이터를 효율적으로 저장할 수 있어야 한다. 따라서 데이터 저장 장치로는 DAT를 사용하게 되며 많은 센서 데이터를 실시간으로 저장하기 위해서 마스터-슬레이브 구조를 갖는 멀티 프로세서 구성을 이용한 항법 데이터 저장 시스템을 설계 제작하였다.

• Journal of The Korean Society of Inherited Metabolic disease
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• v.14 no.2
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• pp.142-149
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• 2014

Purpose: There are 15 types of Glycogen storage disease (GSD) that have been identified, and GSD type Ia is the most common type. There are several studies of Korean GSD type Ia patients' long-term complications. The aim of this study to find out clinical symptoms and prognosis of GSD type Ia patients. Methods: We performed clinical, biochemical and genetic analysis retrospectively on five patients diagnosed with GSD type Ia in a Soonchunhyang University Hospital from July 2002 to July 2014. Results: All patients had hepatomegaly at diagnosis, and they were all confirmed to have fatty liver at abdomen USG. They had no developmental delay, but two of them had growth retardation. Elevated blood lactate, triglyceride, and uric acid levels can find out all patients, but only one patient had hypoglycemia. They are diagnosed with GSD through gene analysis, and by gene analysis, they have c.648G>T (homozygote, splicing mutation), c.122G>A/c.648G>T, c.248G>A/c.648G>T mutations. Treatment with three times meals, three times snacks and four to six times use of uncooked constarch for all patients. Following the progress, one of them resulted in hypothyroidism, other one had renal stones. A patient diagnosed at 16 years old had liver cirrhosis and started having hemodialysis for ESRD. Conclusion: GSD type Ia patients had hepatomegaly, hyperlipidemia, hyperuricemia, and lactacidemia. Therefore patients who have such these symptoms are recommended gene analysis. A patient diagnosed at 16-years-old had liver cirrhosis and ESRD in progress, early diagnosis and treatment are important for GSD type Ia patients.

• The Journal of Korean Society for School & Community Health Education
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• v.25 no.2
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• pp.45-57
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• 2024

Objectives: The purpose of this study is to determine the impact of artificial menopause on the diagnosis of thyroid cancer, breast cancer, and cervical cancer, and to provide basic data for cancer prevention and early diagnosis in women. Methods: Analysis was conducted using raw data from the 2011-2020 National Health and Nutrition Examination Survey. Among the 79,262 people surveyed in the 2011-2020 National Health and Nutrition Examination Survey, 10,207 people were selected as the final research subjects, excluding men, those under 18 years old, those over 80 years old, those who did not participate in the health survey, those with missing data, and those who were not in menopause. Among them, 248 people were diagnosed with thyroid cancer (2.7%), 225 people were diagnosed with breast cancer (2.5%), and 143 people were diagnosed with cervical cancer (21.5%). Results: First, there appeared to be differences between the thyroid cancer diagnosed group and the non-diagnosed group depending on educational level, childbirth experience, and menopause type. Second, there appeared to be differences between the breast cancer diagnosis group and the non-diagnosis group depending on educational level, menopause age, pregnancy experience, childbirth experience, subjective health status, and menopause type. Third, there appeared to be differences between the cervical cancer diagnosis group and the non-diagnosis group depending on menopause age, subjective health status, and menopause type. Fourth, compared to natural menopause, in the case of artificial menopause, the diagnosis probability of women increased by 2.010 times for thyroid cancer, 3.872 times for breast cancer, and 14.902 times for cervical cancer. Conclusion: For thyroid cancer, breast cancer, and cervical cancer, the probability of cancer diagnosis increases in the case of artificial menopause compared to natural menopause, so it is considered important to avoid experiencing artificial menopause to prevent cancer.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.16 no.11
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• pp.2446-2452
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• 2012

In order to meet the recently enhanced emission standards at home and abroad, it is necessary to develop the CRDI ECU control algorithm that users can adjust fuel injection timing and amount in response to their needs. Therefore, this study developed the simulator for knocking analysis that enables knocking discrimination and engine balance correction applicable to the ECU exclusive to the industrial CRDI engine. The purpose of this study is to provide the driver-oriented diagnostic service that enable drivers to diagnose vehicles directly by developing diagnostic devices for vehicles with ths use of the results of the developed simulator for knocing analysis according to the OBD-II standards. For this purpose, this study aims to improve the fuel efficiency of vehicles by proposing the S/W design method of the OBD-II diagnosis device that can provide real-time communcations with the use of wired system and bluetooth module as a wireless system to send and recevice automobile fault diagnosis signal and sensor output signal, and to suggest an improvement for engine efficiency by minimizing the generation of harmful exhaust gas.