• 대한전기학회논문지:시스템및제어부문D
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• 제50권2호
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• pp.65-71
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• 2001

The step response of the Manabe standard form[2] has little overshoot and show almost same waveforms regardless of the order of the characteristic polynomials. In some situations it is difficult to control the rise time and settling time simultaneously of the step response of the Manabe standard form To control its rise time and settling time efficiently, We develop the Manabe standard form: We try to find out the SRFS(Slow Rise time & Fast Setting time) form which has the slower rise time and faster settling time than those fo the Manabe standard form. We also consider the other three forms: FRSS(Fast Rise time & Slow Settling time), SRFS(Slow Rise time & Fast Settling time) and SRSS(Slow Rise time & Slow Settling time) forms. In this paper, by using the evolutionary strategy, we obtain all the coefficient of the four forms we mention above. Finally, we design a controller for a given plant so that the overall system has the performance that the rise time is faster, the settling time is faster than those of the Manabe standard form.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1992년도 춘계학술대회 논문집
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• pp.250-255
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• 1992

This paper discusses how to develop a standard time for face cutting. The discussion focusses especially on the useful experert and law data for automated generate standard time purposes. Make standard time is a means to realize the process planning. Also process planning is a process which expresses design. In past times, a process planning was done using only experience of expert. But nowadays many people try to make automated process planning. This paper discusses standard time of the face cutting, but except making process sequence. In order to make standard time, some rules have to be generated and some industrial data found out. So we can calulate standard time in die. This is to easer and to correct calulate standard time. Using some rules that are application oriented to every parts of die.

• 산업공학
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• 제6권2호
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• pp.91-101
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• 1993

Developed in this paper is a standard time data for shirt sewing operations in the apparel-making industry. Since this data is made of formula developed for each unit operation and includes the formula for the machine time calculation, users could use it for obtaining the normal or standard time without any special efforts. In addition, this data handles the variations due to the design changes of a shirt through the parameters in the formula. compared with the MTM-1. The standard time data developed is shown to be easier and faster in determining the standard time with acceptable accuracy.

• 한국산업보건학회지
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• 제33권1호
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• pp.3-5
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• 2023

Objective: This study introduces exposure concentrations of time-weighted average standard (TWA) evaluation and short-time exposure standard (STEL) evaluation for trichloroethylene in the cleaning process. Methods: Trichloroethylene measurement was conducted according to the KOSHA Guide (A-24-2019) method. It was carried out twice. Results: As a result of the first measurement, TWA concentration exceeded 4 times the exposure standard and STEL concentration exceeded 16 times, but the inaccuracy and breakthrough of the collection time could not be considered, so the second measurement was conducted. The second measurement result was lower than the first measurement result, but exceeded the exposure standards (TWA, STEL). Conclusions: We were able to confirm that the exposure level of workers in the cleaning process using trichloroethylene exceeded the exposure standard. And it is also considered necessary to grasp the approximate concentration using a detector tube in the preliminary survey.

• 산업공학
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• 제11권3호
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• pp.103-114
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• 1998

This paper suggests a computer software system which generates standard times for assembly products. The system called "computer aided logical system for standard times(CALS4ST)" incorporates a modified bill of materials, BOM4ST(BOM for standard time) to deal with auxiliary operations which are not directly related to parts and assemblies listed in the standard BOM. Typical examples of the operations include inspection, adjustment, and repairing works to be done before or after assembly operations. Once standard time data bases for both the part assembly operations and the auxiliary operations are set up, the system relates the BOM4ST to the standard time data bases so as to calculate the standard time for a assembly part concerned. According to the structure of parts and auxiliary operations in the BOM4ST, their standard times stored in the data bases are to be sequentially added up considering the specified assembly-operation characteristics. To illustrate the feasibility of the system, the case study of L company is provided.

• 중환자간호학회지
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• 제2권2호
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• pp.56-67
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• 2009

Purpose: This study was done to suggest the standard ICU nursing procedure and standard ICU nursing practice time carried out according to the standard ICU nursing procedure. Methods: Through the literature review, 35 standard ICU nursing activities were selected and classified under 6 categories. Standard nursing procedures were described by research team and 4 clinical practice experts. Content validity of descripted nursing procedure was performed by 6 clinical practice experts. After that standard ICU nursing procedures were identified, standard nursing practice times were checked through 1:1 observation. Results: 35 ICU nursing activities were identified and categorized into 6 domains of activities. Also, their standard nursing procedures were identified, and finally 33 standard nursing practice times were measured and analyzed. The result of the measurement, 1 ICU nursing activity was spent above 30 minutes, 3 activities done within 10-20 minutes, 4 activities done within 5-10 minutes, and 25 activities were spent below 5 minutes. Conclusion: Through this study, 35 standard ICU nursing procedures were described and 33 standard ICU nursing practice times which carried out according to standard ICU nursing procedures were checked. The result can be as fundamental data for the study of nursing activity time in the ICU.

• 산업공학
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• 제11권2호
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• pp.191-197
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• 1998

Having a reliable standard time data is very important for productivity improvement of any manufacturing company. In this study we present an estimation procedure of standard time data for companies having multi-item extremely small quantity production type and discuss a case study. Included in the discussion are the importance of setup time reduction and the roles of management supervisors, and labor.

• 품질경영학회지
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• 제22권2호
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• pp.127-142
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• 1994

In these days, the PCs are widely used in the mid-level factory. But they have low-effectiveness for using them. The main reason should be the lack of useful and practical software in the market. This Case study aimed at the support of the software using DB Language to get M/M chart for aquiring work study and standard time data in the mid-level factory having multi-item and multi-process type. CVA (Chronocycle Video Analysis) is applied to get basic standard time data and working list. Standard time, Sequence of working and allowance time or rate for man and machine will be readily obtained through the menu when the software executing. Detailed program list is systematically shown in Appendix.

• 천문학논총
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• 제19권1호
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• pp.93-99
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• 2004

In this paper, we describe a principle of the atomic frequency standard and clock system in VLBI(Very Long Baseline Interferometry). The hydrogen maser is a usual VLBI standard. During VLBI observations, signals emitted by distant sources of radio frequency energy(quasars) are received and recorded at several antennas. At each antenna(VLBI station), a very stable frequency standard(hydrogen maser) provides a reference signal which enables time-tagging to the quasar signals as they are being recorded on magnetic tapes or hard-disk modules. For each VLBl experiment, correlation of the time-tagged recorded information between the participating antennas is used to yield the arrival time differences of any specific quasar radio wave between the antennas. These time differences are used to calculate the relative antennas to each other. In this paper, we also introduce the KVN(Korean VLBI Network) atomic frequency standard and clock system.

• 화약ㆍ발파
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• 제33권3호
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• pp.14-20
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• 2015

발파터널의 건설과정에 있어서 가장 중요한 역할을 차지하는 발파작업은 암질상태, 터널의 규모, 사용 장비의 성능, 작업자들의 숙련도 등 다양한 요인에 의해 작업시간에서 차이를 나타낸다. 본 논문에서는 국내 세 곳의 터널발파 현장에서의 발파작업시간 조사를 통해, 표준품셈에서 계산되는 터널발파 사이클 시간과 실제 시공시간과의 차이를 분석하였다. 그 결과, 정상적인 작업이 이루어진 경우 전체적으로 실제 발파작업시간은 품셈보다 약 8%~ 16% 적게 나타나고 있다. 그러나 예상치 못한 상황으로 인해 지연되는 시간까지 포함한다면 실제 작업시간이 품셈을 초과하는 경우가 상당할 것으로 추정되었다. 본 연구는 향후에도 지속적인 작업시간 조사와 품셈과의 비교 분석을 통해 품셈의 적절성을 판단함과 아울러, 발파 굴착의 생산성을 향상시키는데 도움을 주고자 한다.