• International Journal of Quality Innovation
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• 제2권2호
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• pp.127-135
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• 2001

Personnel engaged in the medical field have implemented continual improvement by team activities in an effort to construct a system that reduces the risks involved in medical care. Knowledge in total quality management (TQM), especially statistical quality control (SQC) developed for industry, seems to be applicable to medical care. This paper describes the application of SQC to continual improvement in medical care.

• 한국품질경영학회:학술대회논문집
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• 한국품질경영학회 1998년도 The 12th Asia Quality Management Symposium* Total Quality Management for Restoring Competitiveness
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• pp.673-679
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• 1998

The paper aims to apply a model of continuous quality improvement (CQI) to Taiwan provincial Pin Ton hospital. Tools of quality control were used both total quality management (TQM) and quality control circle (QCC) in order to approach the objective of ${\ulcorner}$higher quality, higher efficiency, lower cost${\lrcorner}$. During two years, this hospital has organized thirteen QC circles that were classified three categories according to that objective: four circles work for higher quality; the other four circles work for higher efficiency; five circles for lower cost. After implementation, several results were found from two viewpoints. From viewpoint of tangibility, one of the most outcomes is to reduce labor cost from 56 persons to 28 persons of temporary employees. From viewpoint of intangibility, the result was evaluated using radar chart to compare the difference after improvement. This paper is going to report the process of CQI for the hospital management because it is a new issue in Taiwan since 1997

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2001년도 춘계학술대회 논문집(한국공작기계학회)
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• pp.171-176
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• 2001

This paper describes the methodology of an IEC 1131-3-based control logic generator for the control system design and converting algorithm between programmable languages. The proposed control logic generator is generated based on the software model and common element with data type, variables, POUs(program organization unit) and execution control unit commonly used within programmable languages of IEC 1131-3 Standard. The generation method of object file was proposed on five programmable language based on IECI 131-3. The generation method of object file is represented as following; 1) the generation method using conversion algorithm from LD to IL with FBD(function block diagram), 2) the generation method using C code generation algorithm from SFC using the SFC execution sequence with FBD and ST(structured text). The proposed control logic generator was implemented by Visual C++ and MFC on MS-windows NT 4.0

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 B
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• pp.1064-1066
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• 2001

In this paper, the harmonic components generated by those two sources are analyzed separately based on the transfer function and shown as the closed form considering the switching frequency, speed of the control processor, gain of the controller, and the inductor and capacitor value of L-C filter. A design procedure is described with one flow chart and explained step by step.

• Communications for Statistical Applications and Methods
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• 제19권5호
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• pp.743-750
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• 2012

In this study, we propose definitions for the one-sided variance for asymmetric distribution. We consider to apply the one-sided variance to the construction to define modified $C_{pk}$, which is a definition for the process capability index for the asymmetric process distribution. Then we consider to obtain the consistent estimation for the one-sided variance and to apply to the various industrial fields.

• 오토저널
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• 제4권1호
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• pp.1-4
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• 1982

우리가 흔히 쓰는 관리도에도 X over bar-R관리도, P(또는 Pn)관리도, C(또는 U)관리도가관리 도의 대종을 이루고 있다. 그러나 기계공업 특히 자동차공업분야에서는 기계가공 부품을 일일이 재기가 어렵거나 시간이 걸리므로 고-노고우 게이지(go-no go gauge)를 써서 선별하는 경우가 많다. 또 금형베품의 조립시에는 측정개소가 많기 때문에 어느 한 부분만을 제어서 관리할 수 없으므로 여러곳을 제어서 관리해야 하는데 이때 금형전체를 어떻게 맞출것인가, 혹은 제품의 공차관리를 어떻게 해나갈 것인가 하는 문제가 생긴다. 다음에 이러한 경우에 유용하게 쓰일 수 있는 관리도의 예를 소개하고자 한다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1997년도 하계학술대회 논문집 B
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• pp.696-698
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• 1997

The marine diesel engine have been widely applied with a mechanical hydraulic governor to control the ship speed for long time. But it was recently very difficult for the mechanical hydraulic governor to control the speed of engine under the condition of low speed and low load because of jiggling by rough fluctuation of rotating torque and hunting by dead time of diesel engine. In order to analyze the speed control system the transfer function was converted from z to w transformation. The author proposed velocity control system with feedback loop by PID controller in order to stabilize for unstable area. The influence of dead time was discussed by Nichols chart and unit step response curve. It was confirmed through computer simulation that the performance improvement of a mechanical hydraulic governor can be obtained by PID controller.

• International Journal of Automotive Technology
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• 제6권6호
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• pp.625-633
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• 2005

Vehicle drift was reduced using statistical six sigma tools. The study was performed through four steps: M (measure), A (analyze), I (improve), and C (control). Step M measured the main factors which were derived from a fishbone diagram. The measurement system capabilities were analyzed and improved before measurement. Step A analyzed critical problems by examining the process capability and control chart derived from the measured values. Step I analyzed the influence of the main factors on vehicle drift using DOE (design of experiment) to derive the CTQ (critical to quality). The tire conicity and toe angle difference proved to be CTQ. This information enabled the manufacturing process related with the CTQ to be improved. The respective toe angle tolerance for the adjustment process was obtained using the Monte Carlo simulation. Step C verified and controlled the improved results through hypothesis testing and Monte Carlo simulation.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2002년도 춘계학술대회 논문집
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• pp.740-744
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• 2002

This paper describes the design and development of drills with deburring inserts. The drills can be used to drill holes and deburr the edges of the drilled holes simultaneously. The drills incorporate deburring inserts within the shank. The insert consists of a fixing base, a cantilever spring and a cutting tip. The stiffness of the cantilever spring and the details of the cutting tip play a central role for the successful deburring performance. The deburring performance is also governed by the conditions of the drilling burr best described by the burr control chart suggested by Dornfeld. With careful burr control, successful deburring is obtained by the drills with deburring inserts.

• 한국식품과학회지
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• 제37권4호
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• pp.678-684
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• 2005

녹변된 마늘의 색소연구 일환으로 녹변색소의 추출 조건과 특성을 조사하고, 녹변마늘의 분광학적 및 관능적 특성을 조사하였으며, 이 자료를 기초로 하여 녹변도를 객관적으로 표시할 수 있는 Green Index를 설정하였다. 녹변마늘의 색소는 비교적 methanol, ethanol 및 물 등의 용매에서 추출이 좋았으나 비극성 용매에는 거의 추출되지 않는 수용성 색소이었으며 1.0% HCl이 첨가된 methanol 용매가 녹변색소의 추출을 위한 최적용매이었다. 색소 추출을 위한 온도의 영향은 추출온도가 높을수록 초기에는 색소 추출률이 높았으나 일정시간이 경과한 후에는 색소의 파괴로 추출률이 감소하였다. $4^{\circ}C$의 저온에서는 초기에 색소추출률이 낮았으나 시간이 경과함에 따라 서서히 추출률은 증가하는 경향을 보였으며, 녹변색소의 안정성과 추출속도를 고려하여 $20^{\circ}C$에서 30분간 추출하는 것이 녹변마늘의 색소추출 최적온도 및 최적시간으로 평가되었다. 녹변색소는 대단히 불안정하여 녹변마늘의 녹변정도를 객관적으로 나타낼 수 있는 방법이 확립되지 않아, 녹변마늘과 대조구를 일정한 비율로 혼합하여 color chart를 고안하였다. 또한 이들의 L, a, b, ${\Delta}E,\;-a/b,\;\sqrt {a^2+b^2}$, 흡광도 및 관능검사 결과를 통해 녹변정도를 정확히 평가할 수 있는 녹변도(green index, GI)를 확립하였다. 녹변된 마늘의 녹변도 특성과 표면색도의 a값 사이에 고도로 유의성 있는 상관관계가 확인되었으며. 이들 두 변수의 상관관계는 Y=-3.465X-11.675의 식으로 표시되었고, 이때 $R^2$는 0.093, F값은 1265.3이었다. 확인실험을 수행한 결과 관능검사에서 GI가 3이상일 때 녹변마늘로 평가되었다. 따라서 본 연구에서 개발한 마늘의 color chart 및 GI는 마늘의 수확 후 저장, 유통과정에서 녹변의 발생유무를 판단하는 지표로서 유용하게 이용할 수 있을 것으로 사료되었다.