• 상하수도학회지
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• 제29권4호
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• pp.493-502
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• 2015

In accordance with the Watershed Sewer System Maintenance Plan enforced on February 2, 2013, the different compliance concentration of effluent limit be applied to effluent discharged from public sewage treatment works(PSTWs) in each watershed on the basis of water quality thereof. With the introduction of watershed sewer system, it is necessary to set the compliance concentration of effluent limit for PSTWs situated in the watershed, by region and PSTW size, to achieve water quality criteria for regional watersheds or target water quality under TMDL program. Watershed Environmental Agencies establish the Watershed Sewer System Maintenance Plan and set the compliance concentrations of effluent limit for PSTWs under the plan. The agencies plan to apply tougher effluent BOD concentration limits in Class I to IV areas. Effluent BOD concentration limits will be toughened from 5~10 mg/L to 3 mg/L in class II~III areas, from 10mg/L to 5mg/L in class IV areas. Uniform application of effluent BOD concentration limits to PSTWs in the watershed sewer system need to be complemented considering type of sewage treatment technology employed and watershed characteristics. Therefore, this study presents method to determine the compliance concentration of effluent limit from PSTWs in the watershed.

• 유기물자원화
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• 제29권2호
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• pp.25-30
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• 2021

본 연구는 인산염 인 농도 측정과 관련하여 숙련도에 의해서 정도관리의 지표가 어떻게 개선되는지를 조사하였다. 아울러 분석기기의 종류에 따른 측정값의 차이가 있는지 함께 비교하였다. 분석자의 숙련도가 분석결과에 미치는 영향을 알아보기 위해 3인의 실험자가 2종의 분석기기를 사용하여 수질오염공정시험기준에 따라 인산염 인을 7회에 걸쳐서 방법검출한계와 정량한계를 측정하였으며, 실험결과 5회 이상 반복실험하면 정도관리지표를 만족하였다. 인산염 인의 정량한계는 0.02 mg/L로 계산되었으며, 분석기기가 다른 경우 정량한계 부근의 시료에 대한 흡광도와 농도가 통계적으로 유의미하게 차이가 있음을 확인하였다.

• Journal of Electrical Engineering and Technology
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• 제7권6호
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• pp.852-858
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• 2012

This paper describes evaluation results of the wind power penetration limit (WPPL) and the wind energy penetration (WEP) in the Mongolian central power system (MCPS). A wind power plant (WPP) in a power system possesses an output power limit because the power system must maintain a balance between the generation and consumption of electricity at all times in order to achieve an adequate level of quality. The instantaneous penetration limit (IPL) of wind generation at a load is determined as the minimum of the three technical constraints: the minimum output, the ramp rate capability, and the spinning reserve of the conventional generating units. In this paper, a WPPL is defined as the maximum IPL divided by the peak load. A maximal variation rate (VR) of wind power is a major factor in determining the IPL, WPPL, and WEP. This paper analyzes the effects of the maximal VR of wind power on the WPPL, WEP, and capacity factor (CF) in the MCPS. The results indicate that a small VR can facilitate a large amount of wind energy while maintaining a high CF with increased wind power penetration.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 1994년도 춘계학술대회 논문집
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• pp.92-100
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• 1994

Forming limit diagrams for three different galvanized deep drawing quality steel sheets have been measured by hemispherical punch stretching. The experimental forming limit diagrams have been compared with results calculated using the shear instability criterion and the M-K model which takes into account a strain gradient effect resulting from bending (curvature) of a flat sheet by punch stretching. The measured data were in good agreement with the results calculated using exponent M value of 8 in Hosford's yield criterion for the M-K model and M= 6 for the shear instability model.

• 대한디지털의료영상학회논문지
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• 제3권1호
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• pp.126-132
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• 1997

Purpose : To apply to Program of Auto processor quality control after comparison of Film density variations with amendments to Auto density by using Check density program and Adjust density program of calibration mode into the Laser imager. Methods : Observe Check and Adjust density variations on the Control chart with standard step and value during seven months from December, 1995 to June, 1956 extending twice a week. (1) Measure density value on the steps after printing out 17-step sensitometric pattern of the Check density program. (2) In the same way, measure density values after amending density by using Adjust density program If they are exceeding allowable error limit. Results : In case of Check density program, the exceeding limit rates of Density difference(DD) and Middle density(MD) are: FL-IM3543 DD=75%. MD=72.5%, FL-IMD DD=0%. MD=30.8%(14.5%) After amending density by using Adjust density program, the exceeding limit rates of all both Laser imager were zero percent. The standard deviations are show lower FL-IM D than FL-IM3543 on the Check density control chart, but higher on the Adjust density control chart. Conclusion : (1) Check density variations by printingout sensitometric pattern extending once a week at least for quality control of the Laser imager. (2) In case of a dusty place, check the Laser beam transmission after cleaning Laser optical unit extending once a month. (3) Be sure to measure and check density values by using adjust density program if they are exceeding allowable error limit. (4) Maintain much better film density by performing the adjust density program even if check density values are existed within normal limit.

• 분석과학
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• 제12권4호
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• pp.312-317
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• 1999

저농도, 고농도의 BOD, COD, TN, TP 항목에 대해 13개 기관을 대상으로 정도관리를 실시하였다. 정도관리 평가값은 6회에 걸쳐 주기적으로 반복측정한 평균치로 정하였으며, 이 값은 실제 조제한 값으로부터 오차율이 5%이내였으며, 표준편차도 0.44 (BOD, 저농도), 2.15 (BOD, 고농도), 0.12 (COD 저농도), 1.63 (COD 고농도), 0.35 (TN 저농도), 1.99 (TN 고농도), 0.05 (TP, 저농도), 0.14 (TP, 고농도)으로 정밀도가 아주 우수한 것으로 나타났다. 6회에 걸쳐 주기적으로 반복측정하여 허용상하한값과 경고상하한값을 구하여 정도관리차트를 얻었으며, 이 차트에 따라 평가한 결과 BOD 저농도의 경우 3개 기관이 5.30, 9.70, 5.30 mg/L로 허용상하한값을 벗어났으며, 고농도는 5개 기관이 허용상하한값을 벗어나 BOD 측정분석의 신뢰도가 다소 좋지 않은 것으로 나타났다. COD 저농도의 경우 4개 실험실, 고농도는 2개 기관이 41.00, 30.60 mg/L로 허용상하한값을 벗어났으며, 그외의 11개 기관은 신뢰할 수 있는 측정분석 결과를 산출하였다. TN 저농도의 경우 1개 기관만이 0.70 mg/L로 허용 하한값을 벗어났지 그외의 11개 기관은 거의 평가값에 가까운 우수한 측정분석 결과를 산출하였으며, 고농도는 거의 대부분인 11개 기관이 허용상하한값의 범위를 벗어나 측정분석 결과에 대한 신뢰도 향상에 보다 더 중점을 두어야 할 것으로 나타났다. TP 저농도의 경우 4개 기관이 1.14, 0.45, 0.64, 1.49 mg/L로 허용 상하한값을 벗어났으며, 고농도는 7개 기관이 허용 상하한값을 벗어나 TP 측정 분석의 신뢰도가 다소 좋지 않은 것으로 나타났다.

• 산업경영시스템학회지
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• 제41권1호
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• pp.118-127
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• 2018

Recently, service quality must reflect several demands of customers who show rapid and various changes so as to be compared with the past. So, objective and rapid measuring methods for service quality are necessary. For them, first of all, service company must calculate their standard of service quality accurately by measuring service quality exactly. Kano classified the degree of influence that is the degree of correspondence of the quality attributes of products and services to the subjective satisfaction of customers. As a result, the types of qualities are classified as attractive, must be, one dimensional, and indifference attributes. They have been widely used quality attributes in various industrial fields up to now. However, Kano model has a limit that it ignores the characters of the next frequent numbers even though there are not much gap comparing to the most frequent number in the questionnaire answers. The limit is attributed to the character of Kano model that the most frequent number is accepted as the only quality character. Timko calculated the customer satisfaction coefficient by using Kano's method and studied the differences in quality character by classifying the quality characteristics in a graphical way through the relationship between the satisfaction and the dissatisfaction coefficient. In this study, we used the quality level determination method of the 7-point Likert scale, which takes the weight into account, to complement the deficiencies of the existing Kano model. We also developed and applied a Potential Satisfaction Level (P) and Potential Customer Demand Improvement (PCDI) Index to present a new approach to the determination of service quality attributes. To measure the level of potential service satisfaction and to understand the degree of improvement, we collected specimens of 51 participants who has been trained in the National Strategy Business Training Program, which has been managed by government agent, and analyzed the results.

• 대한전자공학회논문지TC
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• 제40권9호
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• pp.373-383
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• 2003

본 논문에서는 다양한 서비스가 복합적으로 운용되고 있는 인터넷 망에서PCM 및 ADPCM으로 압축된 음성 데이터를 전송할 경우, 패킷 크기와 한계 지연시간의 변화가 수신측의 음질에 미치는 영향을 분석하고 주어진 한계 지연시간에 대하여 최고의 음질을 제공하기 위한 전송 패킷의 크기에 대하여 논한다. 결과를 얻기 위한 실험은 공중 인터넷 망을 통하여 연결된 두 대의 PC 상에서 이루어졌다. 송신측은 마이크로부터의 음성신호를 PCM 및 ADPCM으로 부호화하고 이를 UDP 패킷을 이용하여 전송하였으며, 수신 측에서는 망에서 발생하는 전송 지연 및 패킷 손실 등을 거친 패킷이 음성신호로 재생된다. 음질 평가를 위하여 송수신 음성 데이터를 수집하여 오프라인에서 비교하며, 알고리즘으로는 객관성을 유지하기 위하여 MNB 방법을 이용하였다. 실험 결과에 의하면, 40Kbps, 32Kbps, 16Kbps의 ADPCM으로 압축된 음성의 전송에서 한계 전송 지연을 100ms로 하였을 경우 음질 열화를 최소화하기 위하여는 패킷 크기의 하한이 각각 300, 400, 500바이트, 패킷 크기의 상한은 공히 1200바이트인 것이 요구된다.

• 품질경영학회지
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• 제24권1호
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• pp.50-60
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• 1996

Though the quality characteristics within a specified tolerance are equally desired quality there is a difference in conformance between a specification limit and a target value. In this paper we propose a measure of process capability that takes into account the degree of conformance to a target value as well as the process variation.

• 한국한의학연구원논문집
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• 제12권3호통권18호
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• pp.79-90
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• 2006

This study was investigated to determine the quality monitoring of distributed materials from Glycyrrhizae Radix (26 samples), Atractylodis Rhizoma Alba (24 samples) according to storage period after $1{\sim}3$ year. We have estimated by identification, purity, loss on drying, ash, acid insoluble ash, extract content, essential oil content, assay and microbial contamination. As a result, Glycyrrhizae Radix (26 samples) were satisfied with the standard of K.P. (Korean Pharmacopoeia) and WHO's microbial contamination limit standard. In the Atractylodis Rhizoma Alba (24 samples), 2 samples were not satisfied with the standard of K.P.(Korean Pharmacopoeia) and WHO's microbial contamination limit standard. The results make practical application of the basic data for the quality control of herbal medicine in storage.