Quality of Maternal, Neonatal and Child (MNCH) care is an important aspect in ensuring healthy outcomes and survival of mothers and children. To maintain quality in health services provided, organizations and other st...Quality of Maternal, Neonatal and Child (MNCH) care is an important aspect in ensuring healthy outcomes and survival of mothers and children. To maintain quality in health services provided, organizations and other stakeholders in maternal and child health recommend regular quality measurement. Quality indicators are the key components in the quality measurement process. However, the literature shows neither an indicator selection process nor a set of quality indicators for quality measurement that is universally accepted. The lack of a universally accepted quality indicator selection process and set of quality indicators results in the establishment of a variety of quality indicator selection processes and several sets of quality indicators whenever the need for quality measurement arises. This adds extra processes that render quality measurement process. This study, therefore, aims to establish a set of quality indicators from a broad set of quality indicators recommended by the World Health Organization (WHO). The study deployed a machine learning technique, specifically a random forest classifier to select important indicators for quality measurement. Twenty-nine indicators were identified as important features and among those, eight indicators namely maternal mortality ratio, still-birth rate, delivery at a health facility, deliveries assisted by skilled attendants, proportional breach delivery, normal delivery rate, born before arrival rate and antenatal care visit coverage were identified to be the most important indicators for quality measurement.展开更多
Technology used to automatically assess video quality plays a significant role in video processing areas. Because of the complexity of video media, there are great limitations to assess video quality with only one fac...Technology used to automatically assess video quality plays a significant role in video processing areas. Because of the complexity of video media, there are great limitations to assess video quality with only one factor. We propose a new method using artificial random neural networks （RNNs） with motion evaluation as an estimation of perceived visual distortion. The results are obtained through a nonlinear fitting procedure and well correlated with human perception. Compared with other methods, the proposed method performs more adaptable and accurate predictions.展开更多
Fiber quality measurement in spinning preparation is crucial for optimizing waste and meeting yarn quality specifications.The brand-new Uster AFIS 6–the next-generation laboratory instrument from Uster Technologies–...Fiber quality measurement in spinning preparation is crucial for optimizing waste and meeting yarn quality specifications.The brand-new Uster AFIS 6–the next-generation laboratory instrument from Uster Technologies–uniquely tests man-made fiber properties in addition to cotton.It provides critical data to optimize fiber process control for cotton,man-made fibers,and blended yarns.展开更多
Accurate link quality estimation is a fundamental building block in quality aware multi hop routing. In an inherently lossy, unreliable and dynamic medium such as wireless, the task of accurate estimation becomes very...Accurate link quality estimation is a fundamental building block in quality aware multi hop routing. In an inherently lossy, unreliable and dynamic medium such as wireless, the task of accurate estimation becomes very challenging. Over the years ETX has been widely used as a reliable link quality estimation metric. However, more recently it has been established that under heavy traffic loads ETX performance gets significantly worse. We examine the ETX metric＇s behavior in detail with respect to the MAC layer and UDP data; and identify the causes of its unreliability. Motivated by the observations made in our analysis, we present the design and implementation of our link quality measurement metric xDDR - a variation of ETX. This article extends xDDR to support network mobility. Our experiments show that xDDR substantially outperforms minimum hop count, ETX and HETX in terms of end-to-end packet delivery ratio in static as well as mobile scenarios.展开更多
In order to improve the purchased goods quality management level of food processing enterprises, the causes of quality management problems were ana- lyzed, which were classified into four categories, namely, natural t...In order to improve the purchased goods quality management level of food processing enterprises, the causes of quality management problems were ana- lyzed, which were classified into four categories, namely, natural toxins in raw ma- terials, quality problems in planting and breeding, quality problems in transportation, quality problems in delivery acceptance. Then, based on the causes, eight measures to improve goods purchasing management were put forward, and graphs were used to illustrate the corresponding countermeasure to each cause. This study is of theo- retical significance for the food processing enterprises to improve the quality man- agement of purchased goods through formulating improvement measures based on their operating states.展开更多
Measuring software quality requires software engineers to understand the system’s quality attributes and their measurements.The quality attribute is a qualitative property;however,the quantitative feature is needed f...Measuring software quality requires software engineers to understand the system’s quality attributes and their measurements.The quality attribute is a qualitative property;however,the quantitative feature is needed for software measurement,which is not considered during the development of most software systems.Many research studies have investigated different approaches for measuring software quality,but with no practical approaches to quantify and measure quality attributes.This paper proposes a software quality measurement model,based on a software interconnection model,to measure the quality of software components and the overall quality of the software system.Unlike most of the existing approaches,the proposed approach can be applied at the early stages of software development,to different architectural design models,and at different levels of system decomposition.This article introduces a software measurement model that uses a heuristic normalization of the software’s internal quality attributes,i.e.,coupling and cohesion,for software quality measurement.In this model,the quality of a software component is measured based on its internal strength and the coupling it exhibits with other component(s).The proposed model has been experimented with nine software engineering teams that have agreed to participate in the experiment during the development of their different software systems.The experiments have shown that coupling reduces the internal strength of the coupled components by the amount of coupling they exhibit,which degrades their quality and the overall quality of the software system.The introduced model can help in understanding the quality of software design.In addition,it identifies the locations in software design that exhibit unnecessary couplings that degrade the quality of the software systems,which can be eliminated.展开更多
BACKGROUND: Hemodialysis (HD) patients are at high risk of infection by hepatitis B virus (HBV) or hepatitis C virus (HCV). The present study was designed to determine the impact of quality control measures on the pre...BACKGROUND: Hemodialysis (HD) patients are at high risk of infection by hepatitis B virus (HBV) or hepatitis C virus (HCV). The present study was designed to determine the impact of quality control measures on the prevention of transmission of blood-borne viruses. METHODS: A total of 6182 adult maintenance HD patients from all HD units in Zhejiang Province were recruited on January 1, 2007. The baseline demographic and clinical characteristics were recorded and all patients were followed up until death or survival at 4 years later. The Quality Control Standards of Hemodialysis were gradually implemented in HD units. The HBV or HCV seroconversion rates of the recruited patients were calculated and compared every year during the observation period. RESULTS: The prevalence of HBV was 8.3% at the beginning of the study, and 6.6% for HCV. With the implementation of the HD quality control measures, the HBV seroconversion rate tended to decrease year by year (χ 2 =6.620, P=0.085), and the HCV seroconversion rate decreased significantly (χ 2 =10.41, P=0.015). Compared with the data in 2007, the HBV seroconversion rate (χ 2 =4.204, P=0.040, relative risk ratio 0.393, 95% CI 0.156-0.991) and the HCV seroconversion rate (χ 2 =7.373, P=0.007, relative risk ratio 0.386, 95% CI 0.189-0.787) decreased significantly in 2010. CONCLUSION: Quality control measures for HD decreased the seroconversion rates of HBV or HCV in HD patients, showing that updated quality control measures reduce the risk for transmission of blood-borne viruses in the HD population.展开更多
AIM: To create and apply a framework for quality assessment and improvement in care for inflammatory bowel disease (IBD) patients. METHODS A framework for quality assessment and improvement was created for IBD based o...AIM: To create and apply a framework for quality assessment and improvement in care for inflammatory bowel disease (IBD) patients. METHODS A framework for quality assessment and improvement was created for IBD based on two generally acknowledged quality models. The model of Donabedian (Df) offers a logistical and productive perspective and the Clinical Value Compass (CVC) model adds a management and service perspective. The framework creates a pedagogical tool to understand the balance between the dimensions of clinical care (CVC) and the components of clinical outcome (Df). The merged models create a framework of the care process dimensions as a whole, reflecting important parts of the IBD care delivery system in a local setting. Clinical and organizational quality measures were adopted from clinical experience and the literature and were integrated into the framework. Data were collected at the yearly check-up for 481 IBD patients during 2008. The application of the quality assessment framework was tested and evaluated in a local clinical IBD care setting in Jnkping County, Sweden. RESULTS: The main outcome was the presentation of how locally-selected clinical quality measures, integrated into two complementary models to develop a frame-work, could be instrumental in assessing the quality of care delivered to patients with IBD. The selected quality measures of the framework noted less anemia in the population than previously reported, provided information about hospitalization rates and the few surgical procedures reported, and noted good access to the clinic. CONCLUSION: The applied local quality framework was feasible and useful for assessing the quality of care delivered to IBD patients in a local setting.展开更多
Operations in assembling and joining large size aircraft components are changed to novel digital and flexible ways by digital measurement assisted alignment.Positions and orientations（P＆O）of aligned components are ...Operations in assembling and joining large size aircraft components are changed to novel digital and flexible ways by digital measurement assisted alignment.Positions and orientations（P＆O）of aligned components are critical characters which assure geometrical positions and relationships of those components.Therefore,evaluating the P＆O of a component is considered necessary and critical for ensuring accuracy in aircraft assembly.Uncertainty of position and orientation（U-P＆O）,as a part of the evaluating result of P＆O,needs to be given for ensuring the integrity and credibility of the result;furthermore,U-P＆O is necessary for error tracing and quality evaluating of measurement assisted aircraft assembly.However,current research mainly focuses on the process integration of measurement with assembly,and usually ignores the uncertainty of measured result and its influence on quality evaluation.This paper focuses on the expression,analysis,and application of U-P＆O in measurement assisted alignment.The geometrical and algebraical connotations of U-P＆O are presented.Then,an analytical algorithm for evaluating the multi-dimensional U-P＆O is given,and the effect factors and characteristics of U-P＆O are discussed.Finally,U-P＆O is used to evaluate alignment in aircraft assembly for quality evaluating and improving.Cases are introduced with the methodology.展开更多
In the supervised classification process of remotely sensed imagery, the quantity of samples is one of the important factors affecting the accuracy of the image classification as well as the keys used to evaluate the ...In the supervised classification process of remotely sensed imagery, the quantity of samples is one of the important factors affecting the accuracy of the image classification as well as the keys used to evaluate the image classification. In general, the samples are acquired on the basis of prior knowledge, experience and higher resolution images. With the same size of samples and the same sampling model, several sets of training sample data can be obtained. In such sets, which set reflects perfect spectral characteristics and ensure the accuracy of the classification can be known only after the accuracy of the classification has been assessed. So, before classification, it would be a meaningful research to measure and assess the quality of samples for guiding and optimizing the consequent classification process. Then, based on the rough set, a new measuring index for the sample quality is proposed. The experiment data is the Landsat TM imagery of the Chinese Yellow River Delta on August 8th, 1999. The experiment compares the Bhattacharrya distance matrices and purity index zl and △x based on rough set theory of 5 sample data and also analyzes its effect on sample quality.展开更多
JT SQE system is a software quality and measurement system. Its design was based on the Chinese national standards of software product evaluation and quality characteristics. The JT SQE system consists of two parts...JT SQE system is a software quality and measurement system. Its design was based on the Chinese national standards of software product evaluation and quality characteristics. The JT SQE system consists of two parts. One is the model for software quality measurement, which is of hierarchical structure. The other is the process of requirements definition, measurement and rating. The system is a feasible model for software quality evaluation and measurement, and it has the advantage of a friendly user interface, simple operation, ease of revision and maintenance, and expansible measurements.展开更多
Purpose:This research focuses on comparing various service quality measures including disconfirmation measures(performance-minus-importance and performance-minus-expectation),performance-only measure,and importance-we...Purpose:This research focuses on comparing various service quality measures including disconfirmation measures(performance-minus-importance and performance-minus-expectation),performance-only measure,and importance-weighted measures(importance-weighted performance-only and importance-weighted disconfirmation)in a festival setting.It also explores the relationship between the constructs of service quality and other variables including visitors’perceptions of overall service quality,overall satisfaction,and future intentions.Reliability,convergent validity,discriminant validity,and predictive validity of five service quality measures are tested and compared.The result shows that the importance-weighted performance-only measure exhibits the highest reliability and validity.展开更多
At the present stage, China's demand for mineral resources is still growing, which means that more mines have to be mined every year to solve the problem. While mining the mine, it is necessary to fully do the min...At the present stage, China's demand for mineral resources is still growing, which means that more mines have to be mined every year to solve the problem. While mining the mine, it is necessary to fully do the mine survey work, if the work is not put in place before mining, then after entering the infrastructure stage, the mine safety production will be greatly negatively affected. Therefore, in order to promote the further improvement of mining efficiency and control the incidence of accidents, it is necessary to do a good job of preliminary measurement. However, in terms of the current situation of China's mine survey work, there are still many problems, only to deal with these legacy problems in place, the mine survey work can be carried out smoothly, under the premise of ensuring the quality of the development, but also to provide adequate protection for the safety of the relevant personnel.展开更多
In recent years, with the development of the national economy and the continuous improvement of people's living standards, the expressway has ushered in a relatively broad space for development. But in the process...In recent years, with the development of the national economy and the continuous improvement of people's living standards, the expressway has ushered in a relatively broad space for development. But in the process of highway construction, roadbed has become the most concerned problem. Good subgrade quality can ensure the road service life and safety performance, and promote the national economic development. In view of this, the paper briefly analyzes the quality control measures of the roadbed and pavement compaction in highway engineering.展开更多
Recently, the domestic real estate environment is good, the rapid development of China's real estate industry for real estate transactions, there is a positive direction, the sales increased year by year. Real est...Recently, the domestic real estate environment is good, the rapid development of China's real estate industry for real estate transactions, there is a positive direction, the sales increased year by year. Real estate sales price is in the housing area multiplied by the real estate unit sales price, so the accuracy of the real estate is directly related to the interests of property owners and developers, and in order to comprehensive management of housing area chart, the housing authority must use housing area chart to manage the property, and to help the owner to maintain its interests, and strictly control the housing area chart, in order to avoid interference, reduce errors. This paper mainly expounds the two meanings of the real estate surface, and analyzes the common problems in the mapping of the real estate surface, so that the peer in the mapping of the real estate surface reference.展开更多
In recent years, urban waterlogging has occurred frequently, which has greatly affected and destroyed traffic safety, urban sanitation and urban ecosystem, and also caused serious economic losses. One of the main reas...In recent years, urban waterlogging has occurred frequently, which has greatly affected and destroyed traffic safety, urban sanitation and urban ecosystem, and also caused serious economic losses. One of the main reasons for urban waterlogging is the irrationality of urban drainage system. However, due to the strong concealment of municipal drainage pipeline engineering, it will be difficult to carry out timely maintenance if problems occur, and the quality problems in the construction process are easily concealed, leaving hidden dangers for later operation, thus bringing inconvenience to residents daily life. Therefore, it is particularly important to pay more attention to the construction of drainage pipes, strictly check and accept the construction of drainage pipes, and study the quality risk factors of municipal drainage pipes to prevent problems before they happen.展开更多
Zibo Railway Station South Square Pedestrian Overpass crosses Wangshe Road and connects the squares on both sides. It is located in the center of the South Square. The main bridge of the footbridge is a half-through a...Zibo Railway Station South Square Pedestrian Overpass crosses Wangshe Road and connects the squares on both sides. It is located in the center of the South Square. The main bridge of the footbridge is a half-through arch bridge, which is arched into a spatial inclined-span tie-type arrangement. The span arrangement is 78.2m, the side span bridge of the main bridge is 6.6m wide, the main span bridge is 9.8m wide, and the clear width of the bridge deck is 6m. Two stairways and two escalators are respectively arranged along the south and north sides of Wangshe Road. The stairways are all three-span steel structures with a width of 3.2m. In order to complete the project with high quality, quality objectives, quality assurance system and quality assurance measures are proposed for the project.展开更多
In highway engineering construction, the construction quality and performance of asphalt pavement will directly affect the overall smoothness, comfort and service life of the highway. Therefore, in the actual construc...In highway engineering construction, the construction quality and performance of asphalt pavement will directly affect the overall smoothness, comfort and service life of the highway. Therefore, in the actual construction, it is necessary to carry out in-depth research and analysis on the construction technology and quality control methods of asphalt pavement in highway engineering, so as to ensure the quality and durability of highway engineering, save more capital costs and speed up the development of Chinas highway cause.展开更多
Objective: study the adverse psychological reactions of chronic schizophrenia patients with diabetes mellitus and the effect of high-quality nursing measures. Methods: 64 patients with chronic schizophrenia complicate...Objective: study the adverse psychological reactions of chronic schizophrenia patients with diabetes mellitus and the effect of high-quality nursing measures. Methods: 64 patients with chronic schizophrenia complicated with diabetes hospitalized from July 2019 to August 2020 were taken as the studied objects and were randomly divided into two groups, 32 cases in each group. The control group was given routine nursing, and the experimental group was given high-quality nursing. The emotional score and compliance score of the two groups before and after nursing were compared. Results: before nursing, there was no significant difference in the emotional score between the two groups (P > 0.05);after nursing, the scores of the experimental group were significantly lower than those of the reference group (P < 0.05);compared with the compliance score, the score of the experimental group was significantly higher than that of the reference group (P < 0.05). Conclusion: the use of high-quality nursing care for patients with chronic schizophrenia and diabetes can improve their bad psychology and mood, enhance compliance, and promote the rehabilitation of the disease, which is worthy of promotion and application.展开更多
Objective To analyze the factors that impact the environment quality of cleaning operating room and to discuss improvement measurement. Methods Environment bacteria testing results and prevalence of surgical incision ...Objective To analyze the factors that impact the environment quality of cleaning operating room and to discuss improvement measurement. Methods Environment bacteria testing results and prevalence of surgical incision infection in cleaning operating room were retro-展开更多
文摘Quality of Maternal, Neonatal and Child (MNCH) care is an important aspect in ensuring healthy outcomes and survival of mothers and children. To maintain quality in health services provided, organizations and other stakeholders in maternal and child health recommend regular quality measurement. Quality indicators are the key components in the quality measurement process. However, the literature shows neither an indicator selection process nor a set of quality indicators for quality measurement that is universally accepted. The lack of a universally accepted quality indicator selection process and set of quality indicators results in the establishment of a variety of quality indicator selection processes and several sets of quality indicators whenever the need for quality measurement arises. This adds extra processes that render quality measurement process. This study, therefore, aims to establish a set of quality indicators from a broad set of quality indicators recommended by the World Health Organization (WHO). The study deployed a machine learning technique, specifically a random forest classifier to select important indicators for quality measurement. Twenty-nine indicators were identified as important features and among those, eight indicators namely maternal mortality ratio, still-birth rate, delivery at a health facility, deliveries assisted by skilled attendants, proportional breach delivery, normal delivery rate, born before arrival rate and antenatal care visit coverage were identified to be the most important indicators for quality measurement.
文摘Technology used to automatically assess video quality plays a significant role in video processing areas. Because of the complexity of video media, there are great limitations to assess video quality with only one factor. We propose a new method using artificial random neural networks （RNNs） with motion evaluation as an estimation of perceived visual distortion. The results are obtained through a nonlinear fitting procedure and well correlated with human perception. Compared with other methods, the proposed method performs more adaptable and accurate predictions.
文摘Fiber quality measurement in spinning preparation is crucial for optimizing waste and meeting yarn quality specifications.The brand-new Uster AFIS 6–the next-generation laboratory instrument from Uster Technologies–uniquely tests man-made fiber properties in addition to cotton.It provides critical data to optimize fiber process control for cotton,man-made fibers,and blended yarns.
文摘Accurate link quality estimation is a fundamental building block in quality aware multi hop routing. In an inherently lossy, unreliable and dynamic medium such as wireless, the task of accurate estimation becomes very challenging. Over the years ETX has been widely used as a reliable link quality estimation metric. However, more recently it has been established that under heavy traffic loads ETX performance gets significantly worse. We examine the ETX metric＇s behavior in detail with respect to the MAC layer and UDP data; and identify the causes of its unreliability. Motivated by the observations made in our analysis, we present the design and implementation of our link quality measurement metric xDDR - a variation of ETX. This article extends xDDR to support network mobility. Our experiments show that xDDR substantially outperforms minimum hop count, ETX and HETX in terms of end-to-end packet delivery ratio in static as well as mobile scenarios.
基金Supported by the Key Scientific Research Program of Beijing Municipal Commission of Education in 2013~~
文摘In order to improve the purchased goods quality management level of food processing enterprises, the causes of quality management problems were ana- lyzed, which were classified into four categories, namely, natural toxins in raw ma- terials, quality problems in planting and breeding, quality problems in transportation, quality problems in delivery acceptance. Then, based on the causes, eight measures to improve goods purchasing management were put forward, and graphs were used to illustrate the corresponding countermeasure to each cause. This study is of theo- retical significance for the food processing enterprises to improve the quality man- agement of purchased goods through formulating improvement measures based on their operating states.
文摘Measuring software quality requires software engineers to understand the system’s quality attributes and their measurements.The quality attribute is a qualitative property;however,the quantitative feature is needed for software measurement,which is not considered during the development of most software systems.Many research studies have investigated different approaches for measuring software quality,but with no practical approaches to quantify and measure quality attributes.This paper proposes a software quality measurement model,based on a software interconnection model,to measure the quality of software components and the overall quality of the software system.Unlike most of the existing approaches,the proposed approach can be applied at the early stages of software development,to different architectural design models,and at different levels of system decomposition.This article introduces a software measurement model that uses a heuristic normalization of the software’s internal quality attributes,i.e.,coupling and cohesion,for software quality measurement.In this model,the quality of a software component is measured based on its internal strength and the coupling it exhibits with other component(s).The proposed model has been experimented with nine software engineering teams that have agreed to participate in the experiment during the development of their different software systems.The experiments have shown that coupling reduces the internal strength of the coupled components by the amount of coupling they exhibit,which degrades their quality and the overall quality of the software system.The introduced model can help in understanding the quality of software design.In addition,it identifies the locations in software design that exhibit unnecessary couplings that degrade the quality of the software systems,which can be eliminated.
基金supported by grants from Zhejiang Health Bureau (2008B073)Zhejiang Education Bureau (Y200909640)
文摘BACKGROUND: Hemodialysis (HD) patients are at high risk of infection by hepatitis B virus (HBV) or hepatitis C virus (HCV). The present study was designed to determine the impact of quality control measures on the prevention of transmission of blood-borne viruses. METHODS: A total of 6182 adult maintenance HD patients from all HD units in Zhejiang Province were recruited on January 1, 2007. The baseline demographic and clinical characteristics were recorded and all patients were followed up until death or survival at 4 years later. The Quality Control Standards of Hemodialysis were gradually implemented in HD units. The HBV or HCV seroconversion rates of the recruited patients were calculated and compared every year during the observation period. RESULTS: The prevalence of HBV was 8.3% at the beginning of the study, and 6.6% for HCV. With the implementation of the HD quality control measures, the HBV seroconversion rate tended to decrease year by year (χ 2 =6.620, P=0.085), and the HCV seroconversion rate decreased significantly (χ 2 =10.41, P=0.015). Compared with the data in 2007, the HBV seroconversion rate (χ 2 =4.204, P=0.040, relative risk ratio 0.393, 95% CI 0.156-0.991) and the HCV seroconversion rate (χ 2 =7.373, P=0.007, relative risk ratio 0.386, 95% CI 0.189-0.787) decreased significantly in 2010. CONCLUSION: Quality control measures for HD decreased the seroconversion rates of HBV or HCV in HD patients, showing that updated quality control measures reduce the risk for transmission of blood-borne viruses in the HD population.
基金Supported by The Futurum Research Council, Jnkping County Council, the Foundation for Clinical Cancer Research in Jnkping CountyVINNVRD-research program for more effective and better health care
文摘AIM: To create and apply a framework for quality assessment and improvement in care for inflammatory bowel disease (IBD) patients. METHODS A framework for quality assessment and improvement was created for IBD based on two generally acknowledged quality models. The model of Donabedian (Df) offers a logistical and productive perspective and the Clinical Value Compass (CVC) model adds a management and service perspective. The framework creates a pedagogical tool to understand the balance between the dimensions of clinical care (CVC) and the components of clinical outcome (Df). The merged models create a framework of the care process dimensions as a whole, reflecting important parts of the IBD care delivery system in a local setting. Clinical and organizational quality measures were adopted from clinical experience and the literature and were integrated into the framework. Data were collected at the yearly check-up for 481 IBD patients during 2008. The application of the quality assessment framework was tested and evaluated in a local clinical IBD care setting in Jnkping County, Sweden. RESULTS: The main outcome was the presentation of how locally-selected clinical quality measures, integrated into two complementary models to develop a frame-work, could be instrumental in assessing the quality of care delivered to patients with IBD. The selected quality measures of the framework noted less anemia in the population than previously reported, provided information about hospitalization rates and the few surgical procedures reported, and noted good access to the clinic. CONCLUSION: The applied local quality framework was feasible and useful for assessing the quality of care delivered to IBD patients in a local setting.
基金support of National Natural Science Foundation of China (No.50905010)Fund of National Engineering and Research Center for Commercial Aircraft Manufacturing (No.SAMC12-JS-15-044)
文摘Operations in assembling and joining large size aircraft components are changed to novel digital and flexible ways by digital measurement assisted alignment.Positions and orientations（P＆O）of aligned components are critical characters which assure geometrical positions and relationships of those components.Therefore,evaluating the P＆O of a component is considered necessary and critical for ensuring accuracy in aircraft assembly.Uncertainty of position and orientation（U-P＆O）,as a part of the evaluating result of P＆O,needs to be given for ensuring the integrity and credibility of the result;furthermore,U-P＆O is necessary for error tracing and quality evaluating of measurement assisted aircraft assembly.However,current research mainly focuses on the process integration of measurement with assembly,and usually ignores the uncertainty of measured result and its influence on quality evaluation.This paper focuses on the expression,analysis,and application of U-P＆O in measurement assisted alignment.The geometrical and algebraical connotations of U-P＆O are presented.Then,an analytical algorithm for evaluating the multi-dimensional U-P＆O is given,and the effect factors and characteristics of U-P＆O are discussed.Finally,U-P＆O is used to evaluate alignment in aircraft assembly for quality evaluating and improving.Cases are introduced with the methodology.
基金Supported in part by the National Natural Science Foundation of China （No.40671136）, Open Research Fund from State Key Laboratory of Remote Sensing Science （No.LRSS0610） and the National 863 Program of China （No. 2006AA12Z215）.
文摘In the supervised classification process of remotely sensed imagery, the quantity of samples is one of the important factors affecting the accuracy of the image classification as well as the keys used to evaluate the image classification. In general, the samples are acquired on the basis of prior knowledge, experience and higher resolution images. With the same size of samples and the same sampling model, several sets of training sample data can be obtained. In such sets, which set reflects perfect spectral characteristics and ensure the accuracy of the classification can be known only after the accuracy of the classification has been assessed. So, before classification, it would be a meaningful research to measure and assess the quality of samples for guiding and optimizing the consequent classification process. Then, based on the rough set, a new measuring index for the sample quality is proposed. The experiment data is the Landsat TM imagery of the Chinese Yellow River Delta on August 8th, 1999. The experiment compares the Bhattacharrya distance matrices and purity index zl and △x based on rough set theory of 5 sample data and also analyzes its effect on sample quality.
文摘JT SQE system is a software quality and measurement system. Its design was based on the Chinese national standards of software product evaluation and quality characteristics. The JT SQE system consists of two parts. One is the model for software quality measurement, which is of hierarchical structure. The other is the process of requirements definition, measurement and rating. The system is a feasible model for software quality evaluation and measurement, and it has the advantage of a friendly user interface, simple operation, ease of revision and maintenance, and expansible measurements.
文摘Purpose:This research focuses on comparing various service quality measures including disconfirmation measures(performance-minus-importance and performance-minus-expectation),performance-only measure,and importance-weighted measures(importance-weighted performance-only and importance-weighted disconfirmation)in a festival setting.It also explores the relationship between the constructs of service quality and other variables including visitors’perceptions of overall service quality,overall satisfaction,and future intentions.Reliability,convergent validity,discriminant validity,and predictive validity of five service quality measures are tested and compared.The result shows that the importance-weighted performance-only measure exhibits the highest reliability and validity.
文摘At the present stage, China's demand for mineral resources is still growing, which means that more mines have to be mined every year to solve the problem. While mining the mine, it is necessary to fully do the mine survey work, if the work is not put in place before mining, then after entering the infrastructure stage, the mine safety production will be greatly negatively affected. Therefore, in order to promote the further improvement of mining efficiency and control the incidence of accidents, it is necessary to do a good job of preliminary measurement. However, in terms of the current situation of China's mine survey work, there are still many problems, only to deal with these legacy problems in place, the mine survey work can be carried out smoothly, under the premise of ensuring the quality of the development, but also to provide adequate protection for the safety of the relevant personnel.
文摘In recent years, with the development of the national economy and the continuous improvement of people's living standards, the expressway has ushered in a relatively broad space for development. But in the process of highway construction, roadbed has become the most concerned problem. Good subgrade quality can ensure the road service life and safety performance, and promote the national economic development. In view of this, the paper briefly analyzes the quality control measures of the roadbed and pavement compaction in highway engineering.
文摘Recently, the domestic real estate environment is good, the rapid development of China's real estate industry for real estate transactions, there is a positive direction, the sales increased year by year. Real estate sales price is in the housing area multiplied by the real estate unit sales price, so the accuracy of the real estate is directly related to the interests of property owners and developers, and in order to comprehensive management of housing area chart, the housing authority must use housing area chart to manage the property, and to help the owner to maintain its interests, and strictly control the housing area chart, in order to avoid interference, reduce errors. This paper mainly expounds the two meanings of the real estate surface, and analyzes the common problems in the mapping of the real estate surface, so that the peer in the mapping of the real estate surface reference.
文摘In recent years, urban waterlogging has occurred frequently, which has greatly affected and destroyed traffic safety, urban sanitation and urban ecosystem, and also caused serious economic losses. One of the main reasons for urban waterlogging is the irrationality of urban drainage system. However, due to the strong concealment of municipal drainage pipeline engineering, it will be difficult to carry out timely maintenance if problems occur, and the quality problems in the construction process are easily concealed, leaving hidden dangers for later operation, thus bringing inconvenience to residents daily life. Therefore, it is particularly important to pay more attention to the construction of drainage pipes, strictly check and accept the construction of drainage pipes, and study the quality risk factors of municipal drainage pipes to prevent problems before they happen.
文摘Zibo Railway Station South Square Pedestrian Overpass crosses Wangshe Road and connects the squares on both sides. It is located in the center of the South Square. The main bridge of the footbridge is a half-through arch bridge, which is arched into a spatial inclined-span tie-type arrangement. The span arrangement is 78.2m, the side span bridge of the main bridge is 6.6m wide, the main span bridge is 9.8m wide, and the clear width of the bridge deck is 6m. Two stairways and two escalators are respectively arranged along the south and north sides of Wangshe Road. The stairways are all three-span steel structures with a width of 3.2m. In order to complete the project with high quality, quality objectives, quality assurance system and quality assurance measures are proposed for the project.
文摘In highway engineering construction, the construction quality and performance of asphalt pavement will directly affect the overall smoothness, comfort and service life of the highway. Therefore, in the actual construction, it is necessary to carry out in-depth research and analysis on the construction technology and quality control methods of asphalt pavement in highway engineering, so as to ensure the quality and durability of highway engineering, save more capital costs and speed up the development of Chinas highway cause.
文摘Objective: study the adverse psychological reactions of chronic schizophrenia patients with diabetes mellitus and the effect of high-quality nursing measures. Methods: 64 patients with chronic schizophrenia complicated with diabetes hospitalized from July 2019 to August 2020 were taken as the studied objects and were randomly divided into two groups, 32 cases in each group. The control group was given routine nursing, and the experimental group was given high-quality nursing. The emotional score and compliance score of the two groups before and after nursing were compared. Results: before nursing, there was no significant difference in the emotional score between the two groups (P > 0.05);after nursing, the scores of the experimental group were significantly lower than those of the reference group (P < 0.05);compared with the compliance score, the score of the experimental group was significantly higher than that of the reference group (P < 0.05). Conclusion: the use of high-quality nursing care for patients with chronic schizophrenia and diabetes can improve their bad psychology and mood, enhance compliance, and promote the rehabilitation of the disease, which is worthy of promotion and application.
文摘Objective To analyze the factors that impact the environment quality of cleaning operating room and to discuss improvement measurement. Methods Environment bacteria testing results and prevalence of surgical incision infection in cleaning operating room were retro-
