• 치위생과학회지
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• 제11권3호
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• pp.181-187
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• 2011

이 연구는 일부 대도시지역 다문화가족 이주여성의 구강건강과 관련된 삶의 질 간의 관련성을 알아보고자 대구지역 다문화가족 이주여성을 대상으로 구강검사와 개별면접조사를 통하여 인구사회학적 특성, 구강건강상태, OHIP-14를 측정하였다. 최종 수합된 189명의 자료로 t-검정 및 분산분석, 이분형 로지스틱 회귀분석을 이용하여 분석한 결과 다음과 같은 결론을 얻었다. 1. 평균 우식치아는 2.23개, 상실치아는 1.48개, 처치치아 5.58로 필리핀에서 온 여성이 기타 다른 나라에서 온 여성보다 상실치아수가 많았으며, 중국에서 온 여성이 충전영구치의 수가 상대적으로 낮았다. 2. 구강건강관련 삶의 질은 상실치아가 많을수록 낮았다.3. 상실치아의 여부에 따른 구강건강관련 삶의 질을 비교해 본 결과 정신적 불편, 신체적 능력저하, 정신적 능력저하, 사회적 능력저하, 사회적 불리 영역에서 구강건강관련 삶의 질이 가장 낮았다. 4. 구강건강관련 삶의 질은 우식경험영구치가 많을수록, 월 가구 수입이 낮을수록 낮게 나타나 우식경험영구치와, 월수입이 구강건강관련 삶의 질에 가장 큰 연관성이 있었다. 다문화가족 이주여성의 구강건강관련 삶의 질은 상실치아 및 우식치아가 많을수록 낮아 다문화가족 여성의 구강건강관련 삶의 질을 향상시킬 수 있는 프로그램을 개발하여 그 효과를 검증하는 후속 연구를 시도해야 할 것이다.

• 산업경영시스템학회지
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• 제44권1호
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• pp.45-50
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• 2021

Machines and facilities are physically or chemically degenerated by continuous usage. The representative type of the degeneration is the wearing of tools, which results in the process mean shift. According to the increasing wear level, non-conforming products cost and quality loss cost are increasing simultaneously. Therefore, a preventive maintenance is necessary at some point. The problem of determining the maintenance period (or wear limit) which minimizes the total cost is called the 'process mean shift problem'. The total cost includes three items: maintenance cost (or adjustment cost), non-conforming cost due to the non-conforming products, and quality loss cost due to the difference between the process target value and the product characteristic value among the conforming products. In this study, we set the production volume as a decreasing function rather than a constant. Also we treat the process variance as a function to the increasing wear rather than a constant. To the quality loss function, we adopted the Cpm+, which is the left and right asymmetric process capability index based on the process target value. These can more reflect the production site. In this study, we presented a more extensive maintenance model compared to previous studies, by integrating the items mentioned above. The objective equation of this model is the total cost per unit wear. The determining variables are the wear limit and the initial process setting position that minimize the objective equation.

• International Journal of Quality Innovation
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• 제4권1호
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• pp.191-204
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• 2003

The target costing technique, mathematically discussed by Sauers, only uses the $C_p index along with Taguchi loss function and $\bar{X}$-P control charts to setup goal control limits. The new specification limits derived from Taguchi loss function is linked through the $C_p value to $\bar{X}$-P control charts to obtain goal control limits. Studies have shown that the point estimator of the $C_p index, $C_p, could vary from time to time due to the sampling error. The suggested approach is to use confidence intervals, especially the lower confidence intervals, to replace the point estimator. Therefore, an improvement on target costing technique is presented by applying the lower confidence interval of the $C_p index and using both Taguchi and Spiring's loss functions together with $\bar{X}$-P charts to make this technique more robust in practice. An example is also provided to illustrate how the improved target costing technique works.

• 품질경영학회지
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• 제31권4호
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• pp.164-175
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• 2003

This paper investigates bootstrap confidence intervals of the process capability index(PCI) based on the expected loss derived from the empirical distribution function(EDF). The PCI based on the expected loss is too complex to derive its confidence interval analytically, so the bootstrap method is a good alternative. We propose three types of the bootstrap confidence interval; the standard bootstrap(SB), the percentile bootstrap(PB), and the acceleration biased­corrected percentile bootstrap(ABC). We also perform a comprehensive simulation study under various process distributions, in order to compare the accuracy of the coverage probability of the bootstrap confidence intervals. In most cases, the coverage probabilities of the bootstrap confidence intervals from the EDF PCI turned out to be more accurate than those from the PCI based on the normal distribution. It is expected that the bootstrap confidence intervals from the EDF PCI can be utilized in real processes where the true distribution family may not be known.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1997년도 가을 학술발표회 논문집
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• pp.381-384
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• 1997

It is necessary for manufacturing the high flowing to use the fly-ash as binder of concrete, therefore, Quality of fly-ash is very important to the fluidity of high flowing concrete. In this study, it is comparing and investigating the fludity of high flowing concrete used some fly-ash which it's Ignition loss is 2.44, 4.90, 7.10%. As a result of this experimental study, Ignition loss of fly-ash effects the properties of high flowing concrete, such as air content, flowability, passability etc. but even if valve of ignition loss is upper the specification, properties of high flowing concrete such as setting and hardening time, compressive strength etc.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2000년도 하계학술대회 논문집
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• pp.377-382
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• 2000

Film bulk acoustic resonator (FBAR) using AIN reactively sputtered at room temperature was fabricated. The FBAR is composed of a piezoelectric aluminium nitride thin film, top electrode of Al and bottom electrode of Au connected by a short (200${\mu}{\textrm}{m}$) transmission line on both sides and reflector layers of SiO$_2$- W Pair. The active areas of Al and Au were patterned using 150${\mu}{\textrm}{m}$ diameter shadow mask. The series resonance frequency (fs) and the parallel resonance frequency (fp) were measured at 1.976 GHz and 2.005 GHz, respectively. The minimum insertion loss and return loss were 6.1 dB and 37.19 dB, and the quality factor (Q) was 4261.

• 한국식품영양학회지
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• 제12권3호
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• pp.258-264
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• 1999

This study was carried out to investigate the status in weight loss yield of edible meat quality and free amino acid contents of the snow crab(Chionoectes japonicus) by steaming and various drying treat-ment. Change of body weight loss in steaming treatment sample were 20.48∼26.72% and yield of edible meat of steaming sample was higher than raw sample(p<0.05) The pH value was increased with steam-ing and drying and pH of trunk meat was more increased than leg meat. Volatile basic nitrogen(VBN) content of vacuum dried sample was highest and VBN of hot-air and freezing dried sample were about 10mg%. Content of vaccum dried sample wre 41.33 and 48,56mg%. Thirty kind of free amino acids dectected in the snow crab and changes of free amino acid in leg meat were markedly reduced by vacuum drying and the reducing ratio of leg meat by freeze drying was little. The major free amino acid of leg and trunk meat were 39.94% 46.78% respectively. The formation of flavor free amino acid in freezing dried sample were high but its hot-air aried sample were small.

• Journal of Communications and Networks
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• 제11권3호
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• pp.297-305
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• 2009

Multiprotocol label switching (MPLS) networks require dynamic flow admission control to guarantee end-to-end quality of service (QoS) for each Internet protocol (IP) traffic flow. In this paper, we propose to tackle the joint routing and admission control problem for the IP traffic flows in MPLS networks without rerouting already admitted flows. We propose two mathematical programming models for this problem. The first model includes end-to-end delay constraints and the second one, end-to-end packet loss constraints. These end-to-end QoS constraints are imposed not only for the new traffic flow, but also for all already admitted flows in the network. The objective function of both models is to minimize the end-to-end delay for the new flow. Numerical results show that considering end-to-end delay (or packet loss) constraints for all flows has a small impact on the flow blocking rate. Moreover, we reduces significantly the mean end-to-end delay (or the mean packet loss rate) and the proposed approach is able to make its decision within 250 msec.

• 방송공학회논문지
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• 제14권6호
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• pp.796-806
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• 2009

SVC(Scalable Video Coding)는 시간-공간-화질의 다양한 스케일러빌러티를 통하여 이종의 망과 다양한 단말 환경에서 컨버전스 미디어 서비스를 제공하기 위한 새로운 비디오 부호화 표준이다. 본 논문에서는 IP 망에서의 패킷 손실(packet loss)로 인한 SVC의 성능을 분석하고 이를 바탕으로 버퍼 넘침(buffer overflow)으로 인한 패킷 손실에 대한 효과적인 SVC 적응(adaptation) 기법을 제시 한다. 특히, IP 망을 통하여 전송되는 SVC는 시간, 공간 스케일러빌리티뿐만 아니라 많은 수의 화질 계층을 포함하여 패킷 기반의 적응에 효과적인 MGS(Medium-Grained Scalability) 기반의 화질 스케일러빌리티를 포함하는 것으로 가정한다. MGS를 포함한 SVC의 패킷 손실로 인한 품질의 영향을 분석한다. 본 논문의 MGS SVC 적응 기법은 접근단위(AU: Access Unit) 또는 GOP 단위로 적응단위를 설정하고 적응단위의 지연이 허용된다는 가정 하에 적응단위내에서 패킷 간의 의존성이 낮은 패킷부터 선택적으로 제거함으로써 패킷 손실로 인한 화질 열화를 최소화하도록 한다. 모의실험을 통하여 패킷 손실로 인한 품질 성능을 정량적으로 분석하고 제안한 적응 기법이 패킷 손실에 효과적으로 대응할 수 있음을 보인다.

• 한국축산식품학회지
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• 제43권3호
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• pp.531-539
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• 2023

The objective of this study was to determine the effects of quality grade (QG), and back-fat thickness on the carcass traits and meat quality properties of Hanwoo steers. Fifty carcasses were sorted into two QG (QG 1+ and 1) and three back-fat thickness (<10 mm, 10 to 19 mm and ≥19 mm) groups. After investigating the carcass traits (rib eye, back-fat thickness, weight, color, yield index, maturity, marbling score, and texture), the longissimus lumborum muscles from the carcass groups were collected and analyzed for meat quality (pH, color, cooking loss, and moisture), texture profiles [Warner-Bratzler shear force (WBSF), and tensile tests], and fatty acid. Results showed that marbling score (p<0.001), moisture (p<0.05) and tensile tests values (p<0.05) had a significant differences between QG1+ and QG1. No differences in pH, color traits, cooking loss and WBSF values occurred between the QG groups. Regarding the back-fat thickness effect, we observed that the carcass weight, yield index (p<0.001), yield grade (p<0.001) and marbling score (p<0.05) had a significant differences among the back-fat thickness groups. Regarding the meat quality, moisture content and WBSF values (p<0.01) among the back-fat thickness groups. The back-fat thickness did not affect the pH, color, cooking loss and tensile tests. The QG and back-fat thickness did not affect the fatty acids contents (p>0.05). It may be concluded that the carcass traits and meat quality were significantly affected the QG and back-fat thickness.