• Industrial Engineering and Management Systems
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• 제4권2호
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• pp.129-135
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• 2005

Continuous quality improvement through process refinement is a must for survival of all industries in the contemporary market place. This is true for both manufacturing and service sectors. While manufacturing has spearheaded quality efforts, the service sector has lagged behind primarily because of inherent difficulties. Customer satisfaction is perhaps the most important performance measure for service quality. There are a number of quality dimensions in service quality, such as reliability, responsiveness, assurance, empathy, and tangibles. An issue of concern is ‘how can one have a unified measure of service quality across all the dimensions?' The intent of this paper is to determine if the Analytical Hierarchy Process (AHP) method could be used to derive a single quality index. AHP is a quantitative technique that structures a multi-attribute, multi-person and multi-period problem hierarchically so that solutions are facilitated. This paper presents the development of an AHP model and the derivation of a Quality Index through it. The model is used in a hypothetical case and a quality index was developed. The advantages of using such a technique are discussed.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2011년도 제37회 추계학술대회논문집
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• pp.404-407
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• 2011

노즐 출구에서 유출되는 이차제트의 코안다 효과를 이용하는 유체역학적 추력편향제어 방법은 초음속 제트의 효율적인 추력편향을 위한 새로운 방법이다. 그동안 진행된 유동가시화 결과에서 관련 기술의 장단점이 관찰된 바 있으나 그 결과가 정성적인 한계가 있었다. 따라서 이차제트의 코안다 효과를 이용한 추력편향제어의 성능특성에 관한 정량적 관찰 연구가 진행되었으며, 이를 통한 시험장치 설계, 보정 및 자료획득 연구결과가 제시되었다.

• 비파괴검사학회지
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• 제25권2호
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• pp.81-86
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• 2005

본 논문에서는 반도체 패키지 내부결함의 비파괴 정량평가를 위한 ESPI 기법을 이용한 시스템 및 검사기 법을 제안하고 있으며, 검사시스템은 ESPI 검사장치, 열변형유도장치, 단열챔버로 구성되어있다. 기존 초음파, X-ray 기반의 검사기법에 비하여 측정시간 및 검사방법이 용이하며, 결함의 정량검출이 가능하다는 장점이 있다. 검사결과에서 대부분의 결함이 열 방출이 많은 칩 주위에서 박리결함으로 나타났으며, 원인은 층간 접착강도의 약화와 열분배 설계에서 문제점인 것으로 사료된다.

• Journal of Mechanical Science and Technology
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• 제15권9호
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• pp.1311-1318
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• 2001

It is necessary to diagnose accurately the characteristics of soot formation and oxidation in a diesel engine. Whereas past measurement techniques for soot concentration give limited information for soot, laser-based two-dimensional imaging diagnostics have a potential to provide temporally and spatially superior resolved measurements of the soot distribution. The technique using laser sheet beam has been applied to an optically accessible diesel engine for the quantitative measurement of soot. The results provided the information for reduction of soot from the diesel engine. Both LIS (Laser Induced Scattering) and LII (Laser Induced Incandescence) techniques were used simultaneously in this study. The images of LIS and LII showed the quantitative distribution of the soot concentration in the diesel engine. In this study, several results were obtained by the simultaneous measurements of LIS and LII technique. The diameter and number density of soot in combustion chamber of the test engine were obtained from ATDC 20 degree to 110 degree. The soot diameter increased about 37% between ATDC 20 degree and 110 degree. The number density of soot, however, decreased significantly between ATDC 40 degree and 70 degree.

• Korean Journal of Acupuncture
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• 제33권4호
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• pp.149-156
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• 2016

Objectives and Methods : The aim of this study was to investigate twirling and supplementation and draining by analyzing ancient acupuncture literature and modern research papers, and to discuss the quantitative standards for the procedure. Results : Twirling supplementation and draining techniques were first described in Huang do neijing, after which they were recorded in various other ancient acupuncture texts. Not only were these techniques used in the active treatment of patient historically, but they also form the foundations of modern-day acupuncture treatment. Twirling supplementation and draining techniques described in ancient literatures can be divided into Yin and Yang. Examples of Yang characteristics include Up, Male, Morning, Hands, the governor vessel, Outside, and Left. The left rotation technique is a reinforcing method performed by moving the thumb forward while rotating the needle. Examples of Yin characteristics include Down, Female, Afternoon, Foot, the conception vessel(CV), Inside, and Right. The right rotation technique is a reducing method performed by moving the thumb backward while rotating the needle. Twirling supplementation and draining has been divided for four ways by classical literature and research that worked before. the direction of acupuncture, the stimulus-quantity of acupuncture, the performance of doctor(the uses of both hands, left and right hand) and the feeling of patient. Conclusions : Therefore, continuous research is required to implement Twirling supplementation and draining in a consistent manner. In addition, more active clinical trials using the techniques are necessary as well.

• 대한기계학회논문집
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• 제16권9호
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• pp.1728-1735
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• 1992

본 연구에서는 실시간 홀로그래피 간섭계(real time holographic interfero- metry ststem)를 구성하고 위상변이법과 디지탈 영상처리를 이용하여 물체 변형을 실 시간으로 자동 측정이 가능하도록 하였다. 한편 광학계 구성과 대상물체의 상태에 따른 오차 요인을 해석하기 위해서 외팔보를 대상물체로 하여 측정된 변형값과 이론값 을 비교하였다. 응용예로써는 터빈 블레이드(turbine blade)에 굽힘력이 가해질때 나타나는 미소변형을 측정하였다.

• 한국강구조학회 논문집
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• 제12권4호통권47호
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• pp.397-406
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• 2000

본 연구는 수평하중을 받는 고층철골가새골조의 횡변위를 정량적으로 제어하는 효율적인 최적화 기법을 제시한다. 이를 위해 철골가새골조의 거동특성에 근거한 변위 민감도를 구성하고 수학적계획법의 일반성을 유지하면서 규모가 큰 문제도 효율적으로 다를 수 있는 근사화 개념이 도입된다. 아울러 단면 재선정시 상용화된 표준철골단면을 이용하는 이산형 최적화 방안도 고려한다. 제시된 기법의 효율성을 검토하기 위해 세 가지 종류의 12층 철골가새골조와 30층의 가새보강된 철골조 모델이 고려된다.

• 한국해양공학회지
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• 제2권1호
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• pp.135-149
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• 1988

Friction welding has been shown to have significant economic and technical advantages. However, one of the major concerns in using friction welding is the reliability of the weld quality. No reliable nondestructive test method is available at present for detecting weld quality, particularly in a production environment. Friction welds are formed by the mechanisms of diffusion as well as mechanical interlocking. The severe plastic flow at the interface by forge action of the process brings the subsurfaces so close together that detection of any unbonded area becomes very difficult. This paper presents an attempt to determine the friction weld strength quantitatively using the ultrasonic pulse-echo method. Instead of detecting flaws or cracks at the interface, the new approach calculates the coefficient of reflection based on measured amplitudes of the echoes. It has been finally confirmed that this coefficient could provide the quantitative relationship to the weld quality such as tensile strength, torsional strength, impact value, hardness, etc. So a new nondestructive analysis system of friction weld strength of dissimilar metals using an ultrasonic technique could be well developed.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 C
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• pp.1850-1852
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• 2000

In this paper, new Partial Discharge (PD) detection technique using Pockels cell was proposed and considerable apparent chaotic characteristics were discussed. For this purpose, PD was generated from needle-plane electrode in air and detected by optical measuring system using Pockels cell, based on Mach-Zehnder interferometer, consisting of He-Ne laser, single mode optical fiber, 50/50 beam splitter and photo detector. A qualitative analysis was carried out by drawing Return map for the normalized time series of the detected PD signals. The results are as follows:(a) Fixed points, between 0.7 and 1.0, are appeared clearly in the right upper area of the return map as the increase in the number of obtained data.(b) Considerable periodicity have been remarked even though exact period and length can not be determined.(c) The self-similarity can be also observed inasmuch as the late paths do not follow the previous ones. Accordingly, exact quantitative analysis such as embedding dimension, fractal dimension, and Lyapunov exponents should be carried out for deducing the quantitative properties regarding PD phenomena.

• Applied Microscopy
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• 제44권4호
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• pp.138-143
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• 2014

Transmission electron microscope (TEM) is an excellent tool for studying the structure and properties of nanostructured materials. As the development of $C_s$-corrected TEM, the direct analysis of atomic structures of nanostructured materials can be performed in the high-resolution transmission electron microscopy (HRTEM). Especially, fast Fourier transform (FFT) technique in image processing is very useful way to determine the crystal structure of HRTEM images in reciprocal space. To apply FFT technique in HRTEM analysis in more reasonable and friendly manner, we made a new circular region of interest (C-ROI) FFT script and tested it for several HRTEM analysis. Consequentially, it was proved that the new FFT application shows more quantitative and clearer results than conventional FFT script by removing the streaky artifacts in FFT pattern images. Finally, it is expected that the new FFT script gives great advantages for quantitative interpretation of HRTEM images of many nanostructured materials.