• 동의생리병리학회지
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• 제24권6호
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• pp.1077-1081
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• 2010

In this work, we report the diagnostic relations among some primary pulse conditions such as the floating/sunken, deficient/forceful, large/fine, and the long/short pulses. For this purpose, we carried out a clinical test, in which 11 Oriental medical doctors had participated to diagnose the pulses for 1566 healthy subjects. The subjects were divided into 11 subgroups and each subgroup was allocated to an individual doctor. It resulted in that, for 847 subjects (54%), two or more than two pulse conditions were felt simultaneously, for which we counted the frequency of the pairs of the pulse conditions. For the statistical analysis, we used a Chi-square test. As a result, at high frequency, the forceful, large, and the long pulses were diagnosed in pairs or in their triplet, and a similar close relation was found between the deficient, fine, and the short pulses. The pairwise diagnoses of the pulse conditions between the forceful, large, and the long pulses, and between the deficient, fine, and the short pulses imply their close relatedness in clinics. This result is supported by the theory of deficiency/excess syndromes. Moreover, we show that the close relatedness among the pulse conditions can be understood in terms of the geometric features of the radial artery near the prominent bone. This is the first work which reports the relatedness between the primary pulses by an objective clinical test.

• 동국한의학연구소논문집
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• 제8권2호
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• pp.131-154
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• 2000

<난경(難經)>은 <내경(內經)>의 사상(思想)을 보다 자세(仔細)하고 심도(深度)있게 문답(問答)을 가설(假說)하여 의난(疑難)을 해석하는 방식으로 편찬된 서적(書籍)으로써, 논술(論述)은 기초이론(基礎理論)을 위주로 하고, 또 일부 병설(病說)도 분석(分析)하였는데 그 내용이 간요(簡要)하며, 변석(辨析)이 매우 정미(精微)하게 되어있다. 그 중 1-23난(難)은 맥(脈)을 논(論)하고, 23-29난(難)은 경락(經絡)을 논(論)하고, 30-47난(難)은 장부(臟腑)를 논(論)하고, 48-61난(難)은 병(病)을 논(論)하고, 62-68난(難)은 혈도(穴道)를 논(論)하고, 69-81난(難)은 침법(鍼法)을 논(論)하였다. 특히 <난경(難經)>에는 진법(診法)으로써 오늘날까지 한의학의 맥진방법(脈診方法)으로써, 가장 많이 응용되고 있는 '독취촌구법(獨取寸口法)'을 명확하게 밝히고 있다. 이에 본(本) 저자(著者)는 <난경(難經)>의 맥론(脈論)에 대한 이해를 높이기 위하여 <난경지연구(難經之硏究)>를 중심으로 1-23난(難)에 나오는 맥론(脈論)들을 정리하여 다음과 같이 정리하였다. 팔십일(八十一) 난경중(難經中) 일난(一難)부터 삼십삼난(三十三難)까지의 맥학(脈學)에 관(關)한 조문중(條文中)에는, 백맥(百脈)이 조회(朝會)하고 그 시작(始作)과 끝이 되는 촌구(寸口)를 중심개념(中心槪念)으로 하고 정상적(正常的)인 생리적(生理的) 맥(脈)과 병적(病的)인 맥(脈)이 대비(對比)되면서 제시(提示)되어있다. 1. 십난(十難)에서 오사(五邪)와 강유(剛柔)의 이론(理論)과 각(各) 장부(臟腑)의 고유(固有)한 맥상(脈狀)이 등장(登場)하고 있다. 2. 십삼난(十三難)에서는 색(色)과 맥(脈), 형육(形肉)의 세가지 요소(要素)가 상응(相應) 또는 상승(相勝)하는가에 따라서 병(病)의 난(難) 역치(易治)를 결정(決定)한다고 하였다. 3. 십사난(十四難)에서는 맥(脈)을 손(損)(지맥(遲脈))과 지(至)(수맥(數脈))으로 구분하는데, 맥(脈)의 손(損)에 따른 이경(離經), 탈정(奪精), 사(死), 절명(絶命)의 구분(區分)과, 맥(脈)의 지(至)에 따른 이경(離經), 탈정(奪精), 사(死), 절명(絶命)을 구분(區分)을 설명(說明)하였다. 4. 십오난(十五難)에서는 현(弦), 구(鉤), 모(毛), 석맥(石脈)으로 사시(四時)에 따라서 맥(脈)이 다르다는 것을 말하였다. 이와같이 난경(難經)에서는 "독취촌구(獨取寸口)"의 맥법(脈法)을 명화(明確)하게 확립(確立)하였으며, <내경(內經)>의 이론(理論)을 더욱 다져서 진일보(進一步)시키면서도 <내경(內經)>과는 다른 독창적(獨創的) 이론(理論)을 제시(提示)한 것이 <난경(難經)>의 가치(價値)를 더하게 하였다.

• 한국안전학회지
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• 제16권1호
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• pp.25-30
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• 2001

This paper studies the effect of vibration characteristics of tube line conveying fluid with the power steering system of bus. We modelled fluid-filled tube line using I-DEAS software to investigate vibration characteristics of the power steering tube line. And we obtained the natural frequency of tube line through finite element analysis. Analytic solutions were compared with experimental solutions to verify finite element model. We tested the tube line to examine an effect of pressure pulse by vane pump and variation of geometry of tube. From both the experimental results and the modeling results for vibration characteristics of the tube line conveying fluid, we confirmed that vibration characteristics induced by pulse propagated along the power steering tube line and resonance occurred around the natural frequency with pulse excitation.

• Journal of Advanced Marine Engineering and Technology
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• 제37권7호
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• pp.694-700
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• 2013

The design of the exhaust manifold for the pulse converters of a 4 strokes high power medium-speed diesel engine is presented in terms of fatigue analysis. The said system undergoes thermal expansion due to high temperature of exhaust gas and is exposed to intrinsic vibration of the internal combustion engine. Moreover, the exhaust pulse generates pressure pulsating along the runner inside manifold. Under such circumstances, the design and construction of exhaust manifold must be carried out in a way to prevent early failure due to fracture. To validate the design concept, a test rig was developed to simulate the combination of thermal and vibrational movements, simultaneously. Experimental results showed that a certain sense of reliability can be achieved by considering a field factor obtained from the results of engine bench tests.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년 학술대회 논문집 정보 및 제어부문
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• pp.366-368
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• 2006

Electronic warfare Support(ES) system measures pulse characteristics for received RF signals that received from all directions. ES system discriminates the pulse trains that have a rule, correlationship, continuance from collected data and analyze the characteristics of the data, and identify the emitters by comparison with emitter identification data(EID). Because pulse density is very high and various signal source exists at modem signal environments, high-speed and accurate signal analysis is needed for realtime countermeasure to emitters. Grouping alleviates the load of signal analysis process and supports reliable analysis. In this paper, we suggest an adaptive clustering scheme regarding signal patterns.

• 한국신뢰성학회지:신뢰성응용연구
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• 제15권2호
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• pp.124-130
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• 2015

A stress-strength analysis is used to assess the reliability of a multi-pulse rocket motor system. Main stress is found to be thermal during explosion and the distribution is obtained by simulation. The strength distribution is derived from the results of actual specimen tests. The failure rate of barrier type pulse separation device is estimated.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2000년도 하계학술대회 논문집
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• pp.144-147
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• 2000

The effect of accelerated aging test on ethylene-propylene-diene monomer(EPDM) rubber used for outdoor insulation was studied by X-ray photoelectron spectroscopy(XPS), scanning electron microscope(SEM), FFT spectrum alalysis, and electrical pulse counts using PC by oscilloscope(300 MHz). In electrical alalysis, FFT spectrum analysis indicated arcing caused a significant increase in the third harmonic content of the leakage current of polluted insulator. Also, pulse counts increased as aging time. The surface oxygen and aluminum content were found to increase and that of carbon and nitrogen were found to decrease with time. The detailed XPS analysis indicated that the concentration of carbon in C-C decreased and concentration of highly oxidized carbons increased with time, which was due to the oxidation of EPDM rubber polymer SEM analysis indicated that crack and erosion of EPDM rubber occurred with time.

• 전력전자학회논문지
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• 제22권6호
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• pp.547-550
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• 2017

This paper presents a loss analysis and compares three pulse width modulation (PWM) methods applied in a three-phase grid-connected bidirectional inverter for an energy storage system. The losses in switching devices and output low pass filters are theoretically analyzed by using PWM control techniques. Grid-connected bidirectional inverters are designed by using PWM techniques, and the designed inverters are simulated to verify the analysis results.

• 전력전자학회논문지
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• 제11권6호
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• pp.489-493
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• 2006

이 논문의 목표는 최적의 효율을 갖는 PLS 구동 인버터 회로를 설계하는 것이다. 일반적으로 펄스로 구동되는 PLS가 높은 광변환 효율을 갖는다고 알려져 있다. 낮은 듀티비의 펄스를 만들 수 있는 회로로는 E급 공진형 인버터와 세미브리지 인버터가 있다. 이 논문에서는 위의 두 회로의 손실을 분석한다. 손실분석을 확인하기 위해서 220V 380W 입력소비전력을 갖는 인버터 회로를 제작하고 시험하였다. 실험결과를 통해서 높은 효율의 PLS 시스템을 확인했다.

• Journal of the Optical Society of Korea
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• 제17권4호
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• pp.305-311
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• 2013

Using receiver eigenmodes, we perform a time-dependent analysis of optical receivers whose optical inputs are corrupted by the amplified spontaneous emission. We use Gaussian receivers for the analysis with Gaussian input pulses. We find the number of contributing eigenmodes increases as the measurement time moves from the pulse center towards the pulse edges at the output of the optical receiver's electrical filter. This behavior is dependent on the bandwidth ratio between the optical and the electrical filters as well as the input pulse's time width.