In order to improve the throughput performance of the secondary users （SUs） in the cognitive radio （CR） environment, a quality of service （QoS） based media access control （MAC） protocol is proposed. In this pr...In order to improve the throughput performance of the secondary users （SUs） in the cognitive radio （CR） environment, a quality of service （QoS） based media access control （MAC） protocol is proposed. In this protocol, the CR node maps the channel state as a vector, and the transmitter and the receiver obtain the final channel map through an AND operation to prepare for an optional channel set. Data from the upper application layer are classified into two priority levels according to the QoS requirement. The data of each level relate to different contention windows so that the priority of real time data can be guaranteed. A two-dimensional discrete-time Markov chain is utilized to evaluate the system performance, and mathematical expressions of the system throughput are derived. Simulation results show that compared with the IEEE 802. 11 distributed coordination function （DCF）, the proposed MAC protocol can achieve higher throughput.展开更多
The Hong Kong housing authority houses a half po pulation of Hong Kong. It constructs and manages pro perty on a massive scale. In 1989, the housing authority makes the decision that by 1993, its construction proj...The Hong Kong housing authority houses a half po pulation of Hong Kong. It constructs and manages pro perty on a massive scale. In 1989, the housing authority makes the decision that by 1993, its construction project management arm, and all construction companies working for the Housing Authority would be certified to the ISO 9000 standard. This decision is to have a profound and lasting impact on the construction industry in Hong Kong. In 1996, a management enhancement programme is launched. Targeting all 15 000 staff in the housing department, the programme aims at changing the culture of the organization and its partners in delivering high calibre services to customers. This paper examines the motivation and reasons behind the initiatives. It outlines the approach and framework used as the authority changes the mindset of a large department of the civil service.展开更多
Objectives To explore the relationship between acceptance of illness and quality of life(QOL),and factors associated with acceptance of illness among men who have sex with men(MSM)living with human immunodeficiency vi...Objectives To explore the relationship between acceptance of illness and quality of life(QOL),and factors associated with acceptance of illness among men who have sex with men(MSM)living with human immunodeficiency virus(HIV).Methods Three hundred and one MSM were recruited from an HIV clinic between August and December 2018.The battery of measurements consisted of the Acceptance of Illness Scale,World Health Organization Quality of Life Questionnaire for HIV brief version,HIV Cognitive Appraisal Scale and a self-designed questionnaire used to collect general information.Pearson correlation test was used to examine the relationship between acceptance of illness and QOL.Univariate and multivariate ordinal logistic regression analyses were used to examine whether the general data(demographic and HIV-related clinical data)and HIV cognitive appraisal were associated with acceptance of illness levels.Results Descriptive analysis showed the acceptance level among MSM living with HIV was moderate(Mean=26.29,SD=5.28).Those with a better acceptance of illness had a better QOL(r=0.69,P<0.01).In the multivariate ordinal logistic regression model,education level,threat appraisals(OR:1.09;95%CI[1.06–1.13]),and controllability appraisals(OR:0.82;95%CI[0.71–0.94])were significantly associated with acceptance of illness.Conclusions Results showed acceptance level was moderate and had a positive correlation with QOL.High level of education,low threat appraisals and high controllability appraisals were related to high illness acceptance.This finding highlights the importance of focusing on HIV-infected MSM with low education and on their perceptions of threat and controllability about HIV-related issues when designing interventions to promote illness acceptance in this vulnerable population.展开更多
In order to provide power quality monitoring activities with metrological certification, a DAS （data acquisition system） has been designed, realized and characterized. The system allows acquisition on tri-phases plu...In order to provide power quality monitoring activities with metrological certification, a DAS （data acquisition system） has been designed, realized and characterized. The system allows acquisition on tri-phases plus neutral lines picking up 499 samples per period of the fundamental at 50 Hz. To ensure certified measurements, the system gets external certified time and voltage references. The system uses a FTDI Virtual Com Port Driver to communicate data over High Speed RS232 virtual interface and it does not need any advanced programming skill. The choice to use a virtual serial communication makes the data acquisition software portable over many platforms, regardless by the development environment and by the programming language. To test the proposed device some custom software have been written in many programming language （C^#, VB6, LabView, MatLab）, moreover in order to characterize the device the most common ADC （analog to digital converter） performing test have been applied.展开更多
Interpretation, either consecutive or simultaneous, demands more advanced linguistic skills as well as higher cognitive strategies than translation. This paper investigates the characteristics of the notes taken by st...Interpretation, either consecutive or simultaneous, demands more advanced linguistic skills as well as higher cognitive strategies than translation. This paper investigates the characteristics of the notes taken by student interpreters in relation to the output and the process of interpretation with the purpsoe of identifying the role of note-taking in the process of interpretation, its relations with the production quality, and the factors that constrain the development of the students＇ potential as future interpreters. Statistical and qualitative analysis of the notes and think-aloud protocol reveals that students majoring in English should further improve their overall English proficiency. Note-taking, either in source language or target language, or both, should be practiced until students are able to use it expertly. Inspite of the importance of note-taking in interpretation, students should be trained to rely more on memory rather than solely on the notes.展开更多
Green buildings should be sustainable, efficient, economical, and to improve the quality of life of users and nearby residents. Unfortunately, some architecture features fostered by energy and environmental certificat...Green buildings should be sustainable, efficient, economical, and to improve the quality of life of users and nearby residents. Unfortunately, some architecture features fostered by energy and environmental certifications do not comply with fire prevention codes. Several factors can influence a building＇s energy efficiency and fire safety, such as bigger or smaller glass areas, building material thermal inertia, and the use of sustainable solutions such as green roofs. In this work, a methodology for integrating energy efficiency and fire prevention in green buildings is presented. A case study comparing a full glass skin and a building with 40% window size is considered. Also, the methodology permits modifications for obtaining a safe and energy efficient building.展开更多
This article is a continuation of the issue in the field of assessment of （dis）advantages resulting from the implementation of the quality management systems （QMS） in a structure of the organization. The publicati...This article is a continuation of the issue in the field of assessment of （dis）advantages resulting from the implementation of the quality management systems （QMS） in a structure of the organization. The publication uses the results of studies conducted in the range of assessment＇s information completeness provided by the certification bodies （CBs） in the context of advantages and disadvantages of the QMS implementation in accordance with PN-EN ISO 9001. In addition, an attempt to define a tool for the QMS assessment of （dis）advantages in the organization has been made. The basis for empirical analysis of the issue was the information provided by an accredited management systems CBs recommended by the Polish Centre for Accreditation （PCA）. There are 33 units in Poland, which were granted by PCA with the accreditation within the range of ISO 9001：2008. In the first stage of the research work, a substantive analysis of websites content among mentioned CBs has been carried out. In addition, the paper proposes use of semantic differential method （SD） to evaluate （dis）advantages of the QMS. SD adaptation for the assessment of the QMS （dis）advantages is the authorial concept. The authors hope for polemic in this area. In the face of obtained results, an authorial SD construction has been proposed, which is useful and may help in the formulation and conveying of the relevant （reliable） information to potential clients in the range of （dis）advantages resulting from the QMS implementation to the organization. As a consequence, the recommendations have been set, which are kind of guidelines that could significantly influence the realignment of the information state conveyed on the internet by the CBs.展开更多
Most of the existing security Mobicast routing protocols are not suitable for the monitoring applications with higher quality of service （QoS） requirement. A QoS dynamic clustering secure multicast scheme （QoS-DCSM...Most of the existing security Mobicast routing protocols are not suitable for the monitoring applications with higher quality of service （QoS） requirement. A QoS dynamic clustering secure multicast scheme （QoS-DCSMS） based on Mobicast and multi-level IxTESLA protocol for large-scale tracking sensornets is presented in this paper. The multicast clusters are dynamically formed according to the real-time status of nodes, and the cluster-head node is responsible for status review and certificating management of cluster nodes to ensure the most optimized QoS and security of multicast in this scheme. Another contribution of this paper is the optimal QoS security authentication algorithm, which analyzes the relationship between the QoS and the level Mofmulti-level oTESLA. Based on the analysis and simulation results, it shows that the influence to the network survival cycle （＇NSC） and real-time communication caused by energy consumption and latency in authentication is acceptable when the optimal QoS security authentication algorithm is satisfied.展开更多
基金The National Science and Technology Major Project( No. 2010ZX03006-002-01 )the National Basic Research Program of China ( 973 Program) ( No. 2011CB302905)the Science and Technology Support Program of Jiangsu Province ( No. BE2011177)
文摘In order to improve the throughput performance of the secondary users （SUs） in the cognitive radio （CR） environment, a quality of service （QoS） based media access control （MAC） protocol is proposed. In this protocol, the CR node maps the channel state as a vector, and the transmitter and the receiver obtain the final channel map through an AND operation to prepare for an optional channel set. Data from the upper application layer are classified into two priority levels according to the QoS requirement. The data of each level relate to different contention windows so that the priority of real time data can be guaranteed. A two-dimensional discrete-time Markov chain is utilized to evaluate the system performance, and mathematical expressions of the system throughput are derived. Simulation results show that compared with the IEEE 802. 11 distributed coordination function （DCF）, the proposed MAC protocol can achieve higher throughput.
文摘The Hong Kong housing authority houses a half po pulation of Hong Kong. It constructs and manages pro perty on a massive scale. In 1989, the housing authority makes the decision that by 1993, its construction project management arm, and all construction companies working for the Housing Authority would be certified to the ISO 9000 standard. This decision is to have a profound and lasting impact on the construction industry in Hong Kong. In 1996, a management enhancement programme is launched. Targeting all 15 000 staff in the housing department, the programme aims at changing the culture of the organization and its partners in delivering high calibre services to customers. This paper examines the motivation and reasons behind the initiatives. It outlines the approach and framework used as the authority changes the mindset of a large department of the civil service.
文摘Objectives To explore the relationship between acceptance of illness and quality of life(QOL),and factors associated with acceptance of illness among men who have sex with men(MSM)living with human immunodeficiency virus(HIV).Methods Three hundred and one MSM were recruited from an HIV clinic between August and December 2018.The battery of measurements consisted of the Acceptance of Illness Scale,World Health Organization Quality of Life Questionnaire for HIV brief version,HIV Cognitive Appraisal Scale and a self-designed questionnaire used to collect general information.Pearson correlation test was used to examine the relationship between acceptance of illness and QOL.Univariate and multivariate ordinal logistic regression analyses were used to examine whether the general data(demographic and HIV-related clinical data)and HIV cognitive appraisal were associated with acceptance of illness levels.Results Descriptive analysis showed the acceptance level among MSM living with HIV was moderate(Mean=26.29,SD=5.28).Those with a better acceptance of illness had a better QOL(r=0.69,P<0.01).In the multivariate ordinal logistic regression model,education level,threat appraisals(OR:1.09;95%CI[1.06–1.13]),and controllability appraisals(OR:0.82;95%CI[0.71–0.94])were significantly associated with acceptance of illness.Conclusions Results showed acceptance level was moderate and had a positive correlation with QOL.High level of education,low threat appraisals and high controllability appraisals were related to high illness acceptance.This finding highlights the importance of focusing on HIV-infected MSM with low education and on their perceptions of threat and controllability about HIV-related issues when designing interventions to promote illness acceptance in this vulnerable population.
文摘In order to provide power quality monitoring activities with metrological certification, a DAS （data acquisition system） has been designed, realized and characterized. The system allows acquisition on tri-phases plus neutral lines picking up 499 samples per period of the fundamental at 50 Hz. To ensure certified measurements, the system gets external certified time and voltage references. The system uses a FTDI Virtual Com Port Driver to communicate data over High Speed RS232 virtual interface and it does not need any advanced programming skill. The choice to use a virtual serial communication makes the data acquisition software portable over many platforms, regardless by the development environment and by the programming language. To test the proposed device some custom software have been written in many programming language （C^#, VB6, LabView, MatLab）, moreover in order to characterize the device the most common ADC （analog to digital converter） performing test have been applied.
文摘Interpretation, either consecutive or simultaneous, demands more advanced linguistic skills as well as higher cognitive strategies than translation. This paper investigates the characteristics of the notes taken by student interpreters in relation to the output and the process of interpretation with the purpsoe of identifying the role of note-taking in the process of interpretation, its relations with the production quality, and the factors that constrain the development of the students＇ potential as future interpreters. Statistical and qualitative analysis of the notes and think-aloud protocol reveals that students majoring in English should further improve their overall English proficiency. Note-taking, either in source language or target language, or both, should be practiced until students are able to use it expertly. Inspite of the importance of note-taking in interpretation, students should be trained to rely more on memory rather than solely on the notes.
文摘Green buildings should be sustainable, efficient, economical, and to improve the quality of life of users and nearby residents. Unfortunately, some architecture features fostered by energy and environmental certifications do not comply with fire prevention codes. Several factors can influence a building＇s energy efficiency and fire safety, such as bigger or smaller glass areas, building material thermal inertia, and the use of sustainable solutions such as green roofs. In this work, a methodology for integrating energy efficiency and fire prevention in green buildings is presented. A case study comparing a full glass skin and a building with 40% window size is considered. Also, the methodology permits modifications for obtaining a safe and energy efficient building.
文摘This article is a continuation of the issue in the field of assessment of （dis）advantages resulting from the implementation of the quality management systems （QMS） in a structure of the organization. The publication uses the results of studies conducted in the range of assessment＇s information completeness provided by the certification bodies （CBs） in the context of advantages and disadvantages of the QMS implementation in accordance with PN-EN ISO 9001. In addition, an attempt to define a tool for the QMS assessment of （dis）advantages in the organization has been made. The basis for empirical analysis of the issue was the information provided by an accredited management systems CBs recommended by the Polish Centre for Accreditation （PCA）. There are 33 units in Poland, which were granted by PCA with the accreditation within the range of ISO 9001：2008. In the first stage of the research work, a substantive analysis of websites content among mentioned CBs has been carried out. In addition, the paper proposes use of semantic differential method （SD） to evaluate （dis）advantages of the QMS. SD adaptation for the assessment of the QMS （dis）advantages is the authorial concept. The authors hope for polemic in this area. In the face of obtained results, an authorial SD construction has been proposed, which is useful and may help in the formulation and conveying of the relevant （reliable） information to potential clients in the range of （dis）advantages resulting from the QMS implementation to the organization. As a consequence, the recommendations have been set, which are kind of guidelines that could significantly influence the realignment of the information state conveyed on the internet by the CBs.
基金Supported by the National Natural Science Foundation of China （No. 60903157）
文摘Most of the existing security Mobicast routing protocols are not suitable for the monitoring applications with higher quality of service （QoS） requirement. A QoS dynamic clustering secure multicast scheme （QoS-DCSMS） based on Mobicast and multi-level IxTESLA protocol for large-scale tracking sensornets is presented in this paper. The multicast clusters are dynamically formed according to the real-time status of nodes, and the cluster-head node is responsible for status review and certificating management of cluster nodes to ensure the most optimized QoS and security of multicast in this scheme. Another contribution of this paper is the optimal QoS security authentication algorithm, which analyzes the relationship between the QoS and the level Mofmulti-level oTESLA. Based on the analysis and simulation results, it shows that the influence to the network survival cycle （＇NSC） and real-time communication caused by energy consumption and latency in authentication is acceptable when the optimal QoS security authentication algorithm is satisfied.
