• Smart Structures and Systems
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• 제22권5호
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• pp.587-609
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• 2018

There is greater significance in identifying the incipient damages in structures at the time of their initiation as timely rectification of these minor incipient cracks can save huge maintenance cost. However, the change in the global dynamic characteristics of a structure due to these subtle damages are insignificant enough to detect using the majority of the current damage diagnostic techniques. Keeping this in view, we propose a hybrid damage diagnostic technique for detection of minor incipient damages in the structures. In the proposed automated hybrid algorithm, the raw dynamic signatures obtained from the structure are decomposed to uni-modal signals and the dynamic signature are reconstructed by identifying and combining only the uni-modal signals altered by the minor incipient damage. We use these reconstructed signals for damage diagnostics using ARMAX model. Numerical simulation studies are carried out to investigate and evaluate the proposed hybrid damage diagnostic algorithm and their capability in identifying minor/incipient damage with noisy measurements. Finally, experimental studies on a beam are also presented to compliment the numerical simulations in order to demonstrate the practical application of the proposed algorithm.

• 대한한의진단학회지
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• 제11권1호
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• pp.72-81
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• 2007

Background & Objective: Pathogenesis treats cause of disease. pyungweesan is pathogenesis prescription of indigestion. prescription has been determined subjectively because there is no standardized prescription. so this study developed questionnaire for a objective and standardized prescription. Method: To determine objective pyungweesan prescription, 24 items of questionnaire are researched two times by delphi method. The questionnaire is selected through 5 reference book and opinions of korean medical doctor. Result: By delphi method and average value, 20 items of questionnaire are chosen. Conclusions: This study becomes basic data for a profound research henceforth. The questionnaire will be developed through being verified by korean medical doctor clinically.

• 대한한의진단학회지
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• 제9권1호
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• pp.125-130
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• 2005

Background and purpose: We evaluated the reliability of two electrodermal measurement devices on meridian skin areas; Electro Acupuncture according to Dr. Voll (EAV) method and newly developed MIR-1. Methods: Eighteen volunteers were tested repeatedly on the same condition with each device. To explore the intra-rater, inter-rater, and test-retest reliabilities, one rater tested each subject twice in succession, then the other rater tested the subject in a row. Finally, retests on the subjects with each device were performed 1 week later. The reliability was determined by Pearson correlation and intraclass correlation statistics. Results: EAV method showed poor reliability, while MIR-1 showed good reliability. Conclusion: It is suggested that further research on the reliability and useful device in both fields of clinical practice and biomedical research.

• 대한한의진단학회지
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• 제10권1호
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• pp.98-108
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• 2006

Background and Purpose: The Han(cold)-Yol(heat) patternization is one of the most usually used diagnostic methods in oriental medicine. This is studies for compensating questionnaries for Han-Yol that were made by Sook-Kyeng Kim. Methods: Questionnaries for Yol should be useful for clinical examination. So symptoms being chosen for questionnaries are based on Donguibogam that is clifnical textbook and 46 items are developed. By delphi panel and statistical analysis Items of questionnaries are choosen. Resultset: By delphi panel and statistical analysis 8 Items of questionnaries are choosen. Conclusion: Further research is necessary for improvement reliabilities and validities of the questionnaires for Yol pattemization.

• 대한한의진단학회지
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• 제15권2호
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• pp.169-174
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• 2011

Objectives: Seven Emotions consist of Joy(喜), Anger(怒), Anxiety(憂), Thought(思), Sorrow(悲), Fear(恐), Fright(驚). If Seven Emotions are excessive, their extreme mental stimulations cause physical illness. The aim of the research is to make a proposal on the concept of Seven Emotions by a statistical comparison between guibi-tang questionnaire and health related questionnaires. Methods: We studied the similarities among three factors of guibi-tang questionnaire and three health related questionnaires(subjective symptoms of fatigue test, beck depression inventory, state-trait anxiety inventory, etc.) using multidimensional scaling. Results and Conclusions: 1. Physical-Emotion Dimension and Chronic-Acute Dimension were labelled in two-dimensional solution. 2. Seven Emotions and Fatigue have a high correlation. 3. Seven Emotions and Trait-Anxiety have a high correlation.

• 대한한의진단학회지
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• 제12권2호
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• pp.8-17
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• 2008

Objectives: For the traditional pulse diagnosis in Oriental Medicine, not only the pulse shape in time domain, but the width, length and depth of arterial pulse also should be measured. However, conventional pulse diagnostic systems have failed to measure the spatial parameters of the arterial pulse e.g. effective length of arterial pulse in the wrist. In fact, there are many ways to measure that kind of spatial features in arterial pulsation, but among them, the method using image sensor provides relatively cheap and simple way, therefore I tested feasibility of measuring 2-dimensional pressure distribution by imaging devices. Methods: Using widely used PC cameras and dotted balloons, the subtle oscillation of skin over the radial artery was recorded continuously, and then the displacement of every dot was calculated. Consequently, the time course of that displacements shows arterial pulse wave. Results: By the proposed method I could get pressure distribution map with 30Hz sampling rate, 21steps quantization resolution, and approximately 1mm spatial resolution. With reduced quantization resolution, $3cm{\times}4cm$ view angle could be achieved. Conclusion: Although this method has some limitations, it would be useful method for detecting 2-dimensional features of arterial pulse, and accordingly, this method provides a novel way to detect 'narrow pulse', 'wide pulse', 'long pulse', 'short pulse', and their derivatives.

• Smart Structures and Systems
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• 제5권4호
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• pp.457-468
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• 2009

A novel approach for integrating active sensing data interrogation algorithms for structural health monitoring (SHM) applications is presented. These algorithms cover Lamb wave propagation, impedance methods, and sensor diagnostics. Contrary to most active-sensing SHM techniques, which utilize only a single signal processing method for damage identification, a suite of signal processing algorithms are employed and grouped into one package to improve the damage detection capability. A MATLAB-based user interface, referred to as HOPS, was created, which allows the analyst to configure the data acquisition system and display the results from each damage identification algorithm for side-by-side comparison. By grouping a suite of algorithms into one package, this study contributes to and enhances the visibility and interpretation of the active-sensing methods related to damage identification. This paper will discuss the detailed descriptions of the damage identification techniques employed in this software and outline future issues to realize the full potential of this software.

• 대한한의진단학회지
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• 제13권1호
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• pp.54-64
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• 2009

Background and purpose : We previously developed questionnaire of Yukmijiwhang-tang symptom on the Delphi method. But developed a questionnaire was not verified in the clinical. So, to ensure objectivity, quantification and validity, verification is needed for questionnaire items before applying a clinical. On this study, we looked at whether questionnaire items had been validity in the clinical. Methods : The previously developed questionnaire of Yukmijiwhang-tang symptom was applied to 200 patients who visited 12 local oriental medicine clinics. Item data were analyzed by factor analysis and reliability test. Results : The developed questionnaire showed remarkable reliability.(Cronbach's $\alpha$=0.869) In factor analysis, items were clustered to 6 factors. Conclusions : The results of this study indicate that the developed quetionnaire is reliable and valid for Yukmijiwhang-tang symptom. It can be used to evaluate Yukmijiwhang-tang symptom objectively.

• 대한한의진단학회지
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• 제11권2호
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• pp.45-58
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• 2007

Background and purpose: We previously developed questionnaire of Bojungikgitang systom on the Delphi method through the pathogenesis analysis. But developed a questionnaire was not verified in the clinical. So, to ensure objectivity, quantification and validity, verification is needed for questionnaire items before applying a clinical. On this study, we looked at whether questionnaire items had been validity in the clinical. Methods: Surveys conducted about 191 patients at 12 oriental medicine hospitals. Among them, patients with Bojungikgitang systom(group I) were 95, and patients with no Bojungikgitang systom(group II) were 96. We calculated that the sum of each item in the survey and then the sum was reviewed statistically significant difference through Independent samples T test between group I and II. Results: Between group I and II, the total sum survey of the percent difference is meaningful (P<0.05). Conclusions: Reliability analysis of the Bojungikgitang systom survey research is needed in the future. Also I think that research should proceed about a lot of people.

• 한국분무공학회지
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• 제9권4호
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• pp.67-76
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• 2004

Diode laser absorption sensors are advantageous because they may provide fast, sensitive, absolute, and selective measurements of species concentration. These systems are very attractive for practical applications owing to its compactness, reasonable cost, robustness, and ease of use. In addition, diode lasers we fiber-optic compatible and thus enable simultaneous measurements of multiple species along a line-of-sight. Recent advances of room-temperature, near-IR and visible diode laser sources for telecommunication, optical data storage applications make it possible to be applied for combustion diagnostics based on diode laser absorption spectroscopy. Therefore, combined with fiber-optics and high sensitive detection strategies, compact and portable sensor systems are now appearing for variety of applications. The objectives of this research are to develop new gas sensing system and to verify feasibility of this system. Wavelength modulation spectroscopy has been demonstrated in these experiments and has a bright prospect to this diode laser system.