• Applied Science and Convergence Technology
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• 제24권5호
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• pp.196-202
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• 2015

Human blood consists of 55% of plasma and 45% of blood cells such as white blood cell (WBC) and red blood cell (RBC). In plasma, there are many kinds of promising biomarkers, which can be used for the diagnosis of various diseases and biological analysis. For diagnostic tools such as a lab-on-a-chip (LOC), blood plasma separation is a fundamental step for accomplishing a high performance in the detection of a disease. Highly efficient separators can increase the sensitivity and selectivity of biosensors and reduce diagnostic time. In order to achieve a higher yield in blood plasma separation, we propose a novel fluid wing structure that is optimized by COMSOL simulations by varying the fluidic channel width and the angle of the bifurcation. The fluid wing structure is inspired by the inertial particle separator system in helicopters where sand particles are prevented from following the air flow to an engine. The structure is ameliorated in order to satisfy biological and fluidic requirements at the micro scale to achieve high plasma yield and separation efficiency. In this study, we fabricated the fluid wing structure for the efficient microfluidic blood plasma separation. The high plasma yield of 67% is achieved with a channel width of $20{\mu}m$ in the fabricated fluidic chip and the result was not affected by the angle of the bifurcation.

• 한국인지과학회:학술대회논문집
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• 한국인지과학회 2005년도 춘계학술대회
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• pp.171-176
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• 2005

본 논문에서는 진단시스템의 추론성능을 향상시키기 위한 방법으로서, 사례 기반 추론을 통해서 규칙 기반 추론의 단점을 보완하여 성능을 향상시키는 혼합형 추론 모델을 제안한다. 본 모델의 특징은 규칙 기반 추론의 확장성 문제와 규칙화 할 수 없는 예외적인 상황에 대한 문제점을 사례 기반 추론에서 사례로 저장하여 규칙 기반 추론의 단점을 보완하는데 있다. 이런 두 모델의 문제점을 해결하는 과정은 첫째로, 문제에 따라 규칙기반추론 모듈의 베이스를 통해서 적절한 규칙을 적용 후 추론을 적용하여 근접한 해를 얻어낸다. 두 번째로, 규칙베이스에 저장되어 있지 않은 문제에 대해서는 사례 라이브러리를 검색하고 유사성 검사를 통해서 저장된 사례를 찾아 입력된 사례에 적용하여 문제를 해결한다. 셋째로, 해결된 문제에 대해서 수정작업을 통해 사례 라이브러리를 확장한다. 이와 같이 세 과정을 통해 본 논문에서 제안하는 방법론의 성과를 측정하기 위하여 정비 메뉴얼을 규칙화하여 규칙베이스를 구축하였고 전문가들의 경험적인 지식에 대해서는 사례라이브러리로 구축하였다. 또한 지식베이스를 통해서 진단을 수행하고 해결된 문제에 대해서 정확도 검사를 통해 진단의 정확성을 측정하여 혼합형추론엔진의 성능을 검증하였다.

• 한국생산제조학회지
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• 제24권3호
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• pp.294-301
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• 2015

Oil filters for vehicular parts are used under high and low temperatures as the engine is cooled, and defects can be generated with repeated changes in the operating environment and with changes in the shape, such as very high internal losses for the bolts. Visually checking for defects inside a bolt is impossible. Nondestructive evaluation methods such as eddy current testing (ECT) are recommended as a more effective way to examine inside a bolt and detect surface defects in a short amount of time. In this study, the fit bobbin coil eddy current probe was applied to checking the bolts. The bolt parameters were calculated by using a COMSOL analysis program to obtain parameters for professional interior design and fault diagnosis.

• Journal of Electrical Engineering and Technology
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• 제9권1호
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• pp.372-377
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• 2014

Being able to monitor the heart will allow the diagnosis of heart diseases for patients during daily activities, and the detection of burden on the heart during strenuous exercise. Furthermore, with the help of U-health technology, immediate medical action can be taken, in the case of abnormal symptoms of the heart in daily life. Therefore, it appears to be necessary to develop the corresponding technology to monitor the condition of the heart daily. In this study, a novel wearable smart system was proposed, to monitor the activity of the heart in daily life, and to further evaluate the rhythm of arrhythmia. The wearable system includes three modified bipolar conductive fiber electrodes in the chest part, which can resolve the reduction problem of the magnitude of the signal, by magnifying the signal and removing the noise, to obtain high affinity and validity for medical-type usage (<0.903%). The biological signal acquisition and data lines, and the signal processing engine and communication consist of a conductive ink, and the pic18 and ANT protocol nRF24AP2, respectively. The proposed algorithm was able to detect a strong ECG, signal and r-point passing over the noise. The confidence intervals were 96 %, which could satisfy the requirement to detect arrhythmia under the unconstrained conditions.

• 대한의용생체공학회:학술대회논문집
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• 대한의용생체공학회 1997년도 추계학술대회
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• pp.193-196
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• 1997

This paper proposes a new medical information management system to be used or small to medium sized clinics and hospitals. The system is designed to process, analyze and manage each patient's clinical record using database technique. The structure of the database was determined and implemented through careful and rigorous study of medical practices in Korea and, therefore, reflects the needs of information management in Korean medical community. Furthermore, a sophisticated inference engine that can deduce possible disease from the result of medical examination is added to the system to provide doctors with a guideline in medical diagnoses.

• 설비공학논문집
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• 제23권11호
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• pp.705-710
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• 2011

Fault detection has to be proceeded by steady state filtering to get rid of transient effect associated with thermal capacity. Coefficient of variance (COV), ratio of standard deviation devided by moving average, was employed as steady-state filter. Engine speed and refrigerant pressures were selected as parameters representing system dynamics. The filtered values were registered as members of steady-state DB. They were found to show good functional relationship with ambient temperature. The relationship was fitted with a second order polynomial and the distribution bounds of the data around the fitted curve were expressed by visual inspection because of varying average and random data interval. Fault data were compared with the steady-state data obtained during normal operation. The fault data were easily isolated from the fault-free one. To make such isolation reliable, tests to construct good DB should be designed in a systematic way.

• 대한안전경영과학회지
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• 제12권3호
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• pp.37-52
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• 2010

This study is aimed at proposing the national policy for medical device control system in Korea as deeply analysed the present status of the system. On 1979, Korean government had started to inspect 24 kinds of the medical devices such as X-ray diagnostic equipments, medical sterilizer and etc. mostly imported from advanced countries which USA, Germany and Japan for the first time according to the Pharmaceutical Affairs Law. However medical devices were becoming consideration as an important partner of diagnosis, curing and alleviation of diseases by medical doctors and also much important keeping the health at home. Furthermore medical devices industry can be designated as a national growth engine industry. So it is necessary not only to harmonize to international standards but also the harmonization of the system including pre-market application and post-market surveillance, is strongly needed by the Korea Food and Drugs Administration(KFDA).

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2021년도 춘계학술대회
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• pp.312-314
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• 2021

정부는 드론을 미래 핵심 성장 동력으로 보고 국가 주도 드론 산업 육성 방안을 마련하고 물품 수송, 산림 보호 및 감시, 시설물 안전 진단 등 다양한 분야에서 시범사업을 하고 드론활용에 적극적이다. 특히, 경찰에서는 실종자 수색을 위해 드론 활용을 시도하고 있으나 기존드론은 배터리 시간의 제약으로 운용시간이 짧고 야산이나 수풀이 우거진 현장에서는 산위에서 항공촬영으로 수색할 수밖에 없어서 효과성이 미흡하다. 본 연구에서는 실종자 수색의 한계점을 극복할 수 있는 드론으로서 가상현실을 활용한 FPV(First Person View)드론을 제안하다.

• 한국빅데이터학회지
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• 제7권1호
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• pp.125-137
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• 2022

운송 산업은 우리나라의 3면이 바다로 둘러싸여 있는 지리적 요건과 자원 소비량의 대부분을 수입에 의존하는 자원 빈곤 문제로 인해 중요한 산업 중 하나이다. 그 중에서도 해운업의 비중은 운송 산업의 대부분을 차지할 정도로 크며, 해운업에서의 유지보수는 선박의 운영 효율성 개선 및 비용 감소에 있어서도 중요하다. 그러나 현재 선박이 유지보수를 위해 일정기간 주기로 검사가 시행되고, 이에 따라 시간과 비용이 발생하며 원인규명도 제대로 되지 않고 있다. 따라서 본 연구에서는 제안 방법론인 LSTM-AutoEncoder를 활용해 실제 선박 운항 데이터에 대해 시점을 고려하여 선박 고장의 원인이 될 수 있는 이상 탐지를 수행한다. 또한 클러스터링을 통해 군집화를 수행하고 이상치에 대해 요인별로 그룹화를 통해 선박 메인엔진 고장의 잠재 원인을 규명한다. 이는 선박의 다양한 정보에 대해 보다 빠르게 모니터링이 가능하고, 이상 정도를 식별할 수 있다. 또한 현재 선박의 고장 감시시스템에 있어서도 구체화된 경보 점 설정과 고장 진단 체계를 갖추고, 유지보수시점을 찾는 데 도움을 줄 수 있을 것이다.

• 동의생리병리학회지
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• 제27권1호
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• pp.34-42
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• 2013

Our study is to review Chinese traditional medicine's journals about the diagnosis and treatment of spasmodic torticollis such as category, syndrome differentiation, acupoints of treatment, and herbal medicine. The journal search was performed using the search engine of China Academic Journal (CAJ) and China Doctor/Master's Dissertation (CDMD) in China National Knowledge Infrastructure (CNKI) from January 1982 to October 2012. Searching key words were the diverse combination of "spasmodic torticollis", "cervical dystonia", "Chinese traditonal medicine", "herbal medicine", "acupuncture", and "syndrome differentiation". The inclusion criteria was all kinds of journals including Chinese traditional medicine approach except for experiment study. The category, syndrome differentiation, acupoints of treatment, and herbal medicine from finally selected journals were extracted and summarized. The fourty-seven Chinese journals were selected finally. The category was divided into wind syndrome, trembling syndrome, convulsive syndrome, and convulsions. The syndrome differentiation was classified as internal stirring of liver wind, yin-blood depletion, invasion of external contraction, uncontrol of governor vessel, internal obstruction of phlegm turbidity, dual deficiency of qi and blood, and blood stasis due to qi stagnation. The combination of acupoints to unblock the meridian and dissipate binds and to tonify governor vessel and repel tremor was mainly used in acupuncture treatment. Galgun-tang or galgun-tanggami was primarily used and the others were the prescriptions to tonify liver and kidney, to calm convulsion, and to dispeling wind-phlegm. We suggests that spasmodic torticollis could be treated using Korean medicine's approach in Korea.