• 한국콘텐츠학회논문지
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• 제10권9호
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• pp.251-258
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• 2010

위절제술을 시행한 위암환자를 대상으로 수술 전 위치확인을 위한 위장조영검사의 영상을 분석하여 위암묘출의 정확도 및 한계성을 알아보고, 이에 따른 대응책을 알아보고자 하였다. 2007년 10월부터 2009년 4월까지 본원에 내원하여 병리조직학적으로 위암으로 확진되어 위절제술을 시행한 조기위암 환자 88명과 조기위암과 비슷한 진행성위암 환자 14명을 대상으로 하여, 수술 전 시행했던 위장조영검사와 수술 후 병리학적 소견을 비교분석하였으며, 영상분석은 10년 이상 근무한 방사선사 2명이 분석하였다. 위암환자 102명의 위절제 후 병리학적 위암위치와 비교를 통한 위장조영검사에서 위암의 발견율은 "확실" 81 예(79.4%), "실패" 21예(20.6%)로 판정되었다. "실패"로 판정된 21예의 위암형태는 IIb+IIc형이 2예(100%), IIb형이 5예(83.3%)로 발견율이 매우 낮았다. 위암의 전구병변인 장형화생은 위장조영검사에서 92예 (90.2%)의 발견율을 보였다. 위장조영검사의 한계점은 IIb형 및 1.0cm이하 미소위암의 발견이 어려웠다. 위암과 동반된 장형화생 92예(90.2%)의 발견은 위장조영검사에서 위암의 발견에 중요한 기준으로 평가된 다. 위장조영검사의 한계점을 극복하기 위해서는 부위에 맞는 정확한 촬영법 및 풍부한 방사선학적 경험을 통한 미세한 점막의 변화를 확인하는 촬영습관이 위암을 발견하는데 기여할 것으로 사료된다.

• Journal of Welding and Joining
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• 제16권5호
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• pp.108-118
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• 1998

This study proposes th analysis and evaluation method of time series ultrasonic signal using the chaos feature extraction for ultrasonic pattern recognition. Features extracted from time series data using the chaos time series signal analyze quantitatively weld defects. For this purpose, analysis objective in this study is fractal dimension and Lyapunov exponent. Trajectory changes in the strange attractor indicated that even same type of defects carried substantial difference in chaosity resulting from distance shifts such as 0.5 and 1.0 skip distance. Such differences in chaosity enables the evaluation of unique features of defects in the weld zone. In quantitative chaos feature extraction, feature values of 4.511 and 0.091 in the case of side hole and 4.539 and 0.115 in the case of vertical hole were proposed on the basis of fractal dimension and Lyapunov exponent. Proposed chaos feature extraction in this study can enhances ultrasonic pattern recognition results from defect signals of weld zone such as side hole and vertical hole.

• 대한기계학회논문집A
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• 제23권7호
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• pp.1065-1074
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• 1999

This study proposes the analysis and evaluation method of time series ultrasonic signal using the chaotic feature extraction for ultrasonic pattern recognition. Features extracted from time series data using the chaotic time series signal analysis quantitatively welding defects. For this purpose analysis objective in this study is fractal dimension and Lyapunov exponent. Trajectory changes in the strange attractor indicated that even same type of defects carried substantial difference in chaoticity resulting from distance shills such as 0.5 and 1.0 skip distance. Such differences in chaoticity enables the evaluation of unique features of defects in the weld zone. In experiment fractal(correlation) dimension and Lyapunov exponent extracted from 6dB ultrasonic defect signals of weld zone showed chaoticity. In quantitative chaotic feature extraction, feature values(mean values) of 4.2690 and 0.0907 in the case of porosity and 4.2432 and 0.0888 in the case of incomplete penetration were proposed on the basis of fractal dimension and Lyapunov exponent. Proposed chaotic feature extraction in this study enhances ultrasonic pattern recognition results from defect signals of weld zone such as vertical hole.

• 대한조선학회논문집
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• 제32권2호
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• pp.93-102
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• 1995

2개의 직렬 흑은 병렬로 원공이 배치된 $[0^{\circ}/45^{\circ}/90^{\circ}/-45^{\circ}]_s$ 복합적층판에 대하여 기계적 접합부의 강도 및 파손양상을 알아보고, 기하학적 형상을 변화시키면서, 파손강도 및 파손모드에 대하여 FEM으로 예측한 값과 실험결과로 얻은 자료, 그리고 실험식으로 계산한 값을 각각 비교 검토했다. 두 직렬 원공이 있는 적층판의 기계적 접합에 있어, $W/d{\geq}4.0$과 $E/d{\geq}3.0$의 기하학적 범위에서 Full bearing 강도를 얻을 수 있다. 두개의 병렬 및 직렬원공인 경우, $G_h{\geq}3.0d$(원공간의 수평거리가 직경의 3배 이상)이고, $G_v{\geq}3.0d$(원공간의 수직거리가 직경의 3배 이상)이면 원공간의 상호간섭효과는 작게 되어, 각각의 원공들을 독립적으로 취급할 수 있다. 복합재료의 특성파악에 알맞은 비파괴 시험법인 AE을 이용했고 미시적 구조를 관찰하기 위해 주사형 전자현미경(SEM)으로 파단면을 촬영하여 탐색하였다.

• 한국컴퓨터정보학회논문지
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• 제20권2호
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• pp.113-120
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• 2015

Technology analysis is to analyze technological data such as patent and paper for a given technology field. From the results of technology analysis, we can get novel knowledge for R&D planing and management. For the technology analysis, we can use diverse methods of statistics. Time series analysis is one of efficient approaches for technology analysis, because most technologies have researched and developed depended on time. So many technological data are time series. Time series data are occurred through time. In this paper, we propose a methodology of technology forecasting using the dynamic time warping (DTW) of time series analysis. To illustrate how to apply our methodology to real problem, we perform a case study of patent documents in target technology field. This research will contribute to R&D planning and technology management.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2000년도 하계학술대회 논문집
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• pp.165-168
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• 2000

This paper presents the tracking resistance and mechanical strength due to boiling absorption of epoxy resin. The single network structure specimen(E series) formed of epoxy alone and interpenetrating polymer network(IPN) structure specimen(EM series) which epoxy resin was taken as first network and methacrylic acid resin as second network were manufactured. As adding $SiO^2$ filler classified by o[phr], 50[phr] and 100[phr] to those specimens, six kinds of specimens were manufactured and boiled in water during 2, 4, 8, 16, 32 and 64[hours]. As a result, it was confirmed that the tracking breakdown time of E series showed a abrupt decrease with boiling time increasing, but that of EM series was decreasing smoothly. Also, it was verified that the degrading rates of mechanical strength was lowerd according to improvement of adhension strength in case of EM series.

• 동의생리병리학회지
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• 제29권6호
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• pp.523-529
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• 2015

The purpose of this case-series study is to report the effect of Seungmahwangryeontang-gami and facial venesection on Hot flush patients. For this report, two of patients had taken Seungmahwangryeontang-gami for 45 days and the other patient had taken eungmahwangryeontang-gami for 60 days. Also, one of the patients had taken twice facial venesection, and the other two patients had done it three times during the treatment. During this period, we tried to find out that there were objective change and subjective change in reduction of hot flush. We were going to ascertain the subjective change through the change of VAS score. In case of objective change, we used the change of the color which were taken by the Derma Vision. The result of the treatment, each patients' VAS score reduced from 73 to 41, 67 to 44, and 71 to 51. Based on the Derma vision's facial color change, the score of Red and Dark Red, which mean Hot flush, were reduced. On the other hand, that of Blue and Dark Blue were increased. According to the results, we had obtained positive clinic effects from Seungmahwangryeontang-gami and facial venesection on Hot flush patients respectively. Although this report is based on few patients' treatments on hot flush with Seungmahwangryeontang-gami and facial venesection, we can use this result in a good way. However, the limitation of this report is that we can't generalize the following result because of the lack of the cases and we can't present a conclusive evidence which can prove the validity of the Hot flush from the case-series study.

• Smart Structures and Systems
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• 제9권6호
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• pp.473-487
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• 2012

GPS has become an established technique in structural health monitoring. This paper presents the application of an on-line GPS RTK system on the Zhujiang Huangpu Bridge (China) for monitoring bridge deck and towers movements. In this study, both the form and functions of movements of the deck and towers of the bridge under affecting loads were monitored in lateral, longitudinal and vertical directions. Such movements were described in time and frequency domains by determining the trend, torsion, periodical of the series using probability density function (PDF). The results of the time series GPS data are practical and useful to bridge health monitoring.

• Korean Journal of Acupuncture
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• 제24권4호
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• pp.13-24
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• 2007

Objectives : This article aims to give guidance on the conduct and reporting of case series and audits of acupuncture, based on common problems that have arisen in the past. This type of project, and particularly the prospective case series or pre- post-intervention study, may give valuable evidence of the overall effectiveness of acupuncture-for example in different situations and in different conditions- and provides one step in the research pathway before generating an hypothesis. Results & Discussion : The project should be designed with the aim of reducing bias as much as possible. Careful and detailed planning is essential for the project to produce worthwhile results that readers can evaluate and replicate. Ethical issues should be considered and formal approval may be necessary. The patient group should be recruited systematically and baseline data obtained. The treatment given should be systematic and decisions to change or end treatment made explicit. The outcome should be measured in ways that are known to be reliable and valid. Musculoskeletal problems can be evaluated with scales for pain and confirmed by measuring one other symptom such as stiffness or one other aspect such as bothersomeness. Global change scores also provide supporting information, and the MYMOP (Measure Yourself Medical Outcome Profile) measure is popular when patients with different conditions are included. The design of questionnaires for beliefs and attitudes is a specialised area that should not be attempted without expert help. Adverse events should also be recorded. Analysis of the data and the best way of summarising and presenting the results are also discussed.

• 대한치과의사협회지
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• 제45권3호통권454호
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• pp.169-181
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• 2007

In this second part of series report on evidence-based dentistry, the level of evidence and the methods for critical appraisal are discussed. The epidemiologic studies, namely clinical studies have some bias per se, and the degree of bias is somewhat predetermined by the study design. The level of evidence can be defined as the reliability of the clinical study and it is dependent on the degree of bias. Thus, it is important to determine the type of the study and to understand its structure before critically appraising them. Systematic reviews of primary studies, randomized controlled trials, nonrandomized clinical trials, cohort studies, case-control studies, and case reports / series constitute the clinical studies and the level of evidence follows the order of the studies listed above. Critical appraisal is the most important procedure in evidence-based dentistry. It is done to determine the credibility of research papers and their usefulness in the clinician s own practice. Critical appraisal is consisted of multiple questions that are helpful for evaluating validity and usefulness of the studies concerning therapy, diagnosis, prognosis, and causation.