Two international treaty frameworks - Amended Protocol II (APII) to the Convention on Certain Conventional Weapons and the Anti-Personnel Mine Ban Convention (APMBC) - have been developed to prohibit or restrict the use of landmines. However, reflecting a gap in current academic research, there is a lack of knowledge of their effectiveness in supporting the humanitarian goals that underpin both treaties. In order to address gaps in the existing literature, this thesis applies an analytical framework grounded in regime theory to develop new insights into the design, implementation and effectiveness of APII and the APMBC within the broader framework of international humanitarian law (IHL). Two main hypotheses are explored. The first considers the importance for regime effectiveness of the relationship between design and implementation processes. The second analyses the significance for the landmine regimes of regime interplay and nesting within wider IHL and mine action discourses. In addressing these hypotheses, design/implementation interplay, agency dynamics and normative considerations represent key themes that enable us to develop new insights to a specific issue area that also demonstrates important linkages to wider humanitarian, security and developmental agendas.

The social norms concept provides a fresh basis for thinking about how public health policies and campaigns impact health behaviour. Social norms offer much promise to the field of public health, nonetheless, the potential role of norms in changing health behaviour have not been fully embraced. This thesis demonstrates that one of the mechanisms by which national level policies (e.g. tobacco control) can promote health behaviour change, such as an increase in quit intentions, is by making smoking less normative and an undesirable behaviour. This study is vital as it provides a broad conceptualization of tobacco denormalisation and shows how its reasoning is able to influence normative beliefs and smoking behaviour. A review of literature was carried out to establish the generic origins of denormalisation as well as demonstrate that this approach (i.e. social norms) has been widely adopted in schools and college settings to influence health behaviour. As a broader perspective of this thinking was imperative to address public health issues at a societal level, tobacco control was employed to investigate how individual polices influence behaviour and normative beliefs. The research methodology used was pluralistic in nature, given that the majority of past tobacco control policy studies employed either quantitative or qualitative methods. Thus adopting both methods a richer amount of data would be obtained in order to generate an improved understanding of how public policy affects norms and smoking behaviour. To empirically examine the relationship between public policy, social norms and smoking behaviour a broad conceptualization was developed to investigate the normative pathways between national level tobacco policy effects on youth and adults’ smoking behaviour. Quantitative results from the longitudinal study, the International Tobacco Control (ITC) Scotland/UK survey, indicate that a comprehensive smoke-free law that covers, without exception, an entire nation (i.e. Scotland) has increased adult smokers’ perceived social unacceptability of smoking, to some extent higher in Scotland than rest of the UK which, in turn, is associated with quit intentions at follow-up, in both countries. The examination of data from the UK Youth Tobacco Policy Study (YTPS) also demonstrated that the influence of tobacco marketing awareness on adolescents’ smoking intentions is mediated by perceived norms. Prior to the enactment of the UK Tobacco Advertising and Promotion Act (TAPA), higher levels of awareness of tobacco advertising and promotion were independently associated with higher levels of perceived sibling approval which, in turn, were positively related to smoking intentions. Independent paths from perceived smoking prevalence and benefits fully mediated the effects of advertising and promotion awareness on intentions, during and after the enactment of the TAPA. Results from the qualitative study generally supported the quantitative findings and provided new insights into how adolescents’ normative beliefs and smoking behaviour are influenced by tobacco control policies. The qualitative group discussion suggests that smoke-free legislation and anti-smoking ads influence perceptions of prevalence, acceptability and smoking behaviour. A number of theoretical implications were presented, including the belief that social norms campaigns and interventions must be focal and salient in individuals’ consciousness so as to effect the desired behaviour change. A theoretical framework of the various normative mechanisms should consequently be integrated into tobacco control policies and norm-based interventions to work in a synergistic manner to influence health-related behaviour. Practical implications of this conceptualization include the view that, instead of public health interventions focusing on conventional approaches (for example, scare tactics), an appropriate strategy would be to incorporate specific information that corrects normative misperceptions and ambiguities among referent populations at individual and societal levels, with consequential normative and health behaviour change. It is recommended that future research employing tobacco industry perceptions and possibly a descriptive norm as additional normative mediators, aside from unacceptability, would be of value to examine whether smoke-free legislation influences quitting partly via changing favourable tobacco industry perceptions, social acceptability of smoking and perceived prevalence of smoking. To sum up, the findings demonstrate that societal level policy measures such as smoke-free legislation and the TAPA are critical elements of a comprehensive tobacco control program that can significantly influence adult smokers’ quit intentions and reduce adolescents’ smoking intentions respectively, by signifying smoking to be less normative and to be socially unacceptable.

梁德華. / "2007年8月" / "附錄1: 《漢紀》、《漢書》、《史記》三書比勘表"--P. 1-873 (2nd group). / 論文(哲學碩士)--香港中文大學, 2007. / 參考文獻(leaves 197-209). / "2007 nian 8 yue" / "Fu lu 1: 'Han ji', 'Han shu', 'Shi ji' san shu bi kan biao"--P. 1-873 (2nd group). / Abstract also in English. / Liang Dehua. / Can kao wen xian (leaves 197-209). / Lun wen (zhe xue shuo shi)--Xianggang Zhong wen da xue, 2007. / Chapter 第一章： --- 引言 --- p.1 / Chapter 第二章： --- 荀悦生平及其學術背景 --- p.2 / Chapter 第一節： --- 荀悦的生平 --- p.2 / Chapter 第二節： --- 《漢紀》、《申鑒》引書硏究 --- p.5 / Chapter 第三節： --- 「荀悦曰」與儒家典籍之關係 --- p.35 / Chapter 第三章： --- 《漢紀》用《史記》考 --- p.48 / Chapter 第一節： --- 前人硏究《漢紀》史源槪況 --- p.48 / Chapter 第二節： --- 《漢紀》用《史記》集證 --- p.53 / Chapter i. --- 《漢紀》用《史記》官名、數字及人物例 --- p.54 / Chapter ii. --- 《漢紀》據《史記》補充史料及文句例 --- p.61 / Chapter iii. --- 《漢紀》直用《史記》文辭例 --- p.69 / Chapter iv. --- 《漢紀》據《史記》改寫文辭例 --- p.77 / Chapter V. --- 《漢紀》與徐廣所見古本《史記》相合例 --- p.88 / Chapter 第三節： --- 結語 --- p.91 / Chapter 第四章： --- 《漢紀》用《漢書》考 --- p.100 / Chapter 第一節： --- 化紀傳體爲編年體 --- p.100 / Chapter 第二節： --- 通比其事 --- p.104 / Chapter 第三節： --- 《漢紀》、《資治通鑑》比事硏究 --- p.106 / Chapter i. --- 取材問題. --- p.109 / Chapter a. --- 《漢紀》弓懺《漢´書Ø志》、〈表〉之文句不見於《通鑑》例 --- p.110 / Chapter b. --- 《漢紀》引錄《漢´書Ø傳》之內容不見於《通鑑》例 --- p.118 / Chapter ii. --- 紀年問題 --- p.125 / Chapter a. --- 論《漢紀》記事以人物爲中心而《通鑑》以時間爲中心 --- p.127 / Chapter b. --- 論《漢紀》記事連類相及而《通鑑》繫年於確實年份 --- p.131 / Chapter 第四節： --- 《漢紀》整理《漢書》之方法 --- p.133 / Chapter i. --- 《漢紀》迻錄《漢書》原文例 --- p.133 / Chapter ii. --- 《漢紀》以通假、同義、近義詞改易《漢書》文句例 --- p.135 / Chapter iii. --- 《漢紀》删削《漢書》人物對白例 --- p.139 / Chapter iv. --- 《漢紀》删削《漢書》情節例 --- p.145 / Chapter v. --- 《漢紀》因删削而失《漢書》原文文意例 --- p.152 / Chapter vi. --- 《漢紀》槪括《漢書》文句例 --- p.156 / Chapter vii. --- 《漢紀》修飾《漢書》文辭例 --- p.160 / Chapter viii. --- 《漢紀》改寫《漢書》文句例 --- p.165 / Chapter ix. --- 《漢紀》補充《漢書》例 --- p.172 / Chapter X. --- 《漢紀》倂合《漢書》不同篇章例 --- p.178 / Chapter Xi. --- 《漢紀》據其他古籍改易《漢書》文句例 --- p.186 / Chapter 第四節： --- 結語 --- p.192 / Chapter 第五章： --- 結論 --- p.195 / 參考書目 --- p.197 / Chapter 附錄一： --- 《漢紀》、《漢書》、《史記》三書比勘表 --- p.1-837

Unemployment among formerly incarcerated citizens is a complex problem that continues to grow. Previous reentry studies describe the collateral effects of incarceration on employment from the perspective of formerly incarcerated individuals, yet little academic research exists regarding reentry practitioners' perceptions of constraints during the job search process. Using Goldratt's theory of constraints as the foundation, the purpose of this case study of reentry and employment in a mid-Atlantic state was to explore from the perspective of practitioners, the types of constraints individuals with criminal records face during the job search process, the most difficult phase of the job search process, and recommendations on improving employment outcomes. Data for this study were obtained from 20 reentry professionals in Maryland, who completed an online, open-ended response survey. Data were inductively coded and subjected to thematic analysis procedure. The results showed that practitioners perceived the background check to be the most difficult phase in the job search process, and that external and environmental constraints such as employer bias and social stigma prevent individuals with criminal records from securing job offers. The results also showed that reentry professionals support automatic record expungement, record shielding, employer partnerships, and employment programming that provides job leads, resume building, and mock interview assistance. The positive social change implications stemming from this study include policy recommendations to policy makers to include centralizing and expanding the location of statewide employment centers, record shielding under the Second Chance Act, and fair education access through Ban-the Box for state colleges.

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Antecedentes: Varios estudios han demostrado como las políticas de control del tabaquismo favorecen el abandono del consumo del tabaco entre los fumadores, incrementan la aceptabilidad y el cumplimiento de los espacios sin humo. Sin embargo, se desconoce el impacto que las diferentes medidas de control del tabaquismo tienen en los hospitales catalanes. Hipótesis: 1) La política de espacios sin humo en los hospitales reduce la prevalencia de consumo de tabaco entre los trabajadores, favoreciendo cambios en la actitud y el comportamiento en el cumplimiento de las normativas. 2) La Ley 28/2005 ha contribuido a la progresión y el avance de las políticas de control de tabaquismo en los hospitales y 3) ha fomentado cambios en la disminución del humo ambiental del tabaco (HAT) en los hospitales de Cataluña. 4) Los hospitales de 7 países europeos que han desarrollado el modelo de hospital sin humo de la Red Europea sin Humo (ENSH) presentan niveles bajos de HAT en distintas áreas de hospitalización. 5) El programa de cesación tabáquica dirigido a trabajadores fumadores de los hospitales miembros de la Red Catalana de Hospitales sin Humo (XCHsF) consigue una alta tasa de abstinencia. Objetivos: 1) Describir los efectos en el consumo de tabaco tras la implantación progresiva de las políticas de control de tabaquismo en un centro hospitalario: el Instituto Catalán de Oncología (ICO). 2) Valorar la progresión de las políticas de control de tabaquismo en los hospitales miembros de la XCHsF antes y después de la implantación de la Ley de medidas de control del tabaco 28/2005. 3) Evaluar el impacto de la Ley de control de tabaquismo 28/2005 en la exposición al HAT en los hospitales públicos catalanes, antes (2005) y después (2006) de su implantación. 4) Describir los niveles de HAT mediante la determinación de partículas PM2.5, en una muestra de hospitales europeos en el año 2007. 5) Evaluar la efectividad de un programa de cesación tabáquica dirigido a los trabajadores hospitalarios. Metodología: Para conseguir los objetivos marcados se han realizado cinco estudios que incluyen: una serie de encuestas transversales, un estudio pre-post de evaluación de las medidas de control del tabaco, dos estudios de determinación del HAT - uno realizado en Cataluña, y el otro en 7 países europeos- y un estudio de evaluación de la efectividad de un programa de cesación tabáquica coordinado por la XCHsF en 33 hospitales. Resultados: La prevalencia de consumo de tabaco en el ICO disminuyó del 34,5% en 2001 al 30,6% en el 2006. Entre los médicos la prevalencia descendió del 20,0% al 15,2%, entre las enfermeras del 34,0% al 32,6%, y entre los administrativos del 56,0% al 37,0%. Se produjeron cambios en el patrón de consumo como la reducción del número de cigarrillos y del número de fumadores diarios. La puntuación media de la implementación de las políticas de control del tabaco en los hospitales fue del 52,4 (IC 95%: 45,4-59,5) en 2005 y 71,6 (IC 95%: 67,0-76,2) en 2007 (aumento del 36,7%). Los hospitales con mayor incremento fueron los hospitales generales (48%), hospitales con >300 camas (41,1%), hospitales cuyos trabajadores fuman entre un 35-39% (72,2%), hospitales con un implantación reciente de políticas de control del tabaco (74,2%). En los hospitales de Cataluña la concentración media de nicotina disminuyó de 0,23 μg/m3 (rango intercuartil: 0,13-0,63) antes de la Ley 28/2005, a 0,10 μg/m3 (rango intercuartil: 0,02-0,19) después de la Ley (disminución del 56,5%). Tras la Ley se observaron reducciones significativas en la concentración mediana de nicotina en todas las localizaciones, aunque se continuaron detectando valores de HAT en las entradas de los hospitales, sala de urgencias, escaleras de incendios y cafeterías. La mediana de las concentraciones de PM2.5 en una muestra de 30 hospitales europeos fue de 3,0 μg/m3. La mitad de las medidas presentaron valores entre 2,0 a 7,0 μg/m3. Los niveles de PM2.5 fueron similares entre los diferentes países. Once medidas (5,5%) estaban por encima de 25,0 μg/m3, límite recomendado por la OMS para los espacios exteriores. Los trabajadores de una muestra de hospitales catalanes que entraron en el programa de cesación tabáquica coordinado por la XCHsF presentaron una probabilidad de abstinencia global a los 6 meses de 0,504 (IC 95%: 0,431- 0,570). Los hombres obtuvieron mejor abstinencia 0,526 (IC 95%: 0,398-0,651) que las mujeres (0,495 IC 95%: 0,410-0,581). Por grupos profesionales, los médicos obtuvieron una abstinencia más alta (0,659, IC 95%: 0,506-0,811) que las enfermeras (0,463, IC 95%: 0,349-0,576). Los trabajadores con mayor dependencia a la nicotina tuvieron una menor probabilidad de abstinencia (0,376, IC 95%: 0,256-0,495) que los trabajadores con baja dependencia (0,529, IC 95%: 0,458-0,599). Se observa una alta probabilidad de abstinencia en trabajadores que siguieron un tratamiento farmacológico combinado (bupropion y sustitutivos de la nicotina) (0,761, IC 95%: 0,588-0,933). Conclusiones: La introducción progresiva de políticas de control del tabaquismo en los hospitales se asocia con una ligera disminución del consumo de tabaco y la modificación del patrón de consumo entre los trabajadores fumadores. La política de espacios sin humo en los hospitales disminuye la percepción de la exposición al HAT e incrementa el cumplimiento auto reportado de la normativa entre los trabajadores. Los niveles de HAT disminuyen en los hospitales tras la entrada en vigor de la Ley 28/2005. La valoración de las concentraciones de nicotina en fase vapor ofrece un sistema de monitorización objetivo y fiable que refuerza el cumplimiento de los espacios sin humo. La presencia de HAT en los hospitales europeos monitorizada mediante PM2.5 es baja, a excepción de la hallada en lugares en los que se permite fumar cuya concentración es elevada. Los hospitales miembros de la XCHsF presentan un mayor control de tabaquismo (medidas mediante el cuestionario europeo selfaudit) tras dos años de implantación de la Ley 28/2005 (2007) que los obtenidos antes de la Ley (2005). El programa de cesación tabáquica coordinado por la XCHsF dirigido a los trabajadores hospitalarios fumadores obtiene una alta probabilidad de abstinencia a los seis meses. Los trabajadores tratados con dependencia baja o media, los fumadores de 10-19 cigarrillos al día y los tratados con terapia combinada obtuvieron mejores tasas de abstinencia / "Implementation and Evaluation of Tobacco control Policies in Hospitals" Background: Several studies have shown that tobacco control policies favour the cessation of tobacco use, increase population support and improve compliance with smoke free policies. However, the impact of tobacco control measures in Catalan hospitals is unknown. Hypothesis: 1) The smoke free policy in hospitals reduces the prevalence of tobacco consumption among workers and increases compliance with smoke free regulations; 2) Law 28/2005 has increased tobacco control policies in hospitals; 3) has decreased second-hand smoke (SHS) levels among Catalan hospitals; 4) European hospitals which have developed the European smoke free model (ENSH) have low levels of SHS in different areas; 5) the smoking cessation program addressed to hospital employees achieves a high rate of abstinence. Aims: 1) To describe the effects on tobacco consumption after the gradual implementation of tobacco control policies in a hospital; 2) to evaluate the progression of tobacco control policies in hospitals members of the XCHsF before and after the implementation of Law 28/2005, 3) To assess the impact of tobacco control Law 28/2005 on exposure to SHS in public hospitals in Catalonia, before (2005) and after (2006) its implementation. 4) To describe the levels of SHS by the assessment of PM2.5 particles in a sample of European hospitals in 2007; 5) to evaluate the effectiveness of a smoking cessation program addressed to hospital workers. Methodology: Five studies have been conducted, which were: a series of cross-sectional surveys, a pre-post evaluation of tobacco control measures, two studies for the assessment of SHS- one in Catalonia, and another in 7 European countries- and a study evaluating the effectiveness of a smoking cessation program. Results: The tobacco consumption at one hospital dropped from 34.5% in 2001 to 30.6% in 2006. Smokers changed their consumption patterns with the reduction of the number of cigarettes smoked per day and the decrease of daily smokers. The average score of the implementation of tobacco control policies in hospitals was 52.4 (95% CI 45.4 to 59.5) in 2005 and 71.6 (95% CI 67.0 to 76.2) in 2007 (up 36.7%). The average median concentration of nicotine decreased 56.5% after the implementation of Law 28/2005. However, nicotine was found in hospitals halls, emergency rooms, fire escapes and cafeterias. The median concentrations of PM2.5 in a sample of 30 European hospitals were low (3.0 ug/m3). The abstinence probability of the XCHsF tobacco cessation program at 6 months was 0.504 (95% CI 0.431 to 0.570). Workers with higher nicotine dependence showed a lower likelihood of abstinence (0.376, 95% CI: .256 to .495) than the low-dependence (0.529, 95% CI 0.458 to 0.599). There is a high probability of abstinence among workers treated with combined drug therapy (bupropion and nicotine replacement) (0.761, 95% CI 0.588 to 0.933). Conclusions: Tobacco control policies in hospitals are associated with a slight decline in smoking consumption, reduction of levels of SHS, and high probability of abstinence at 6 months.

Secure information exchanges over cyberspace is on the increase due to the convergence of wireless and mobile access technologies in all businesses. Accordingly, with the proliferation of diverse multicast group service subscriptions that are possible to co-exist within a single broadband network, there is also huge demand by the mobile subscribers to ubiquitously access these services over high speed broadband using their portable devices. Likewise, the Network Providers (NPs) invest hugely in infrastructure deployment to disseminate these services efficiently and concomitantly. Therefore, cyber security in any business is obligatory to restrict access of disseminated services to only authorised personnel. This becomes a vital requirement for a successful commercialisation of exchanged group services. The standard way to achieve cyber security in a wireless mobile multicast communication environment is through confidentiality using Group Key Management (GKM).The existing GKM schemes for secure wireless multicast from literature only target single group service confidentiality; however, the adoption of multiple group service confidentiality in them involve inefficient management of keys that induce huge performance overheads unbearable for real time computing. Therefore, a novel authenticated GKM scheme for multiple multicast group subscriptions known as slot based multiple group key management (SMGKM) is proposed. In the SMGKM, the handovers move across diverse decentralised clusters of homogeneous or heterogeneous wireless access network technologies while participating in multiple group service subscriptions. Unlike the conventional art, the SMGKM advances its security by integrating location based authentication and GKM functions. Both functions are securely offloaded from the Domain Key Distributor (DKD) to the intermediate cluster controllers, Area Key Distributors (AKDs), in a distributed fashion, using the proposed location based authenticated membership list (SKDL). A significant upgrade of fast handoff performance with reduced performance overheads of the SMGKM scheme is achieved. The developed numerical analysis and the simulation results display significant resource economy in terms of reduced rekeying transmission, communication bandwidth and storage overheads while providing enhanced security. The performance of the SMGKM in a high speed environment is also evaluated and has demonstrated that SMGKM outperforms the previous work. Finally, the SMGKM correctness against various attacks is verified using BAN logic, the eminent tool for analysing the widely deployed security protocols. The security analysis demonstrates that SMGKM can counteract the security flaws and redundancies identified in the chosen related art.

The existence of the rhino is under serious threat. South Africa has experienced a dramatic increase in rhino poaching since 2008. With the current trend of poaching, rhino in South Africa will soon become extinct. The current strategies to protect rhino have proved to be ineffective. The common view is that rhino poaching is morally wrong, and associated with greed and evil intentions and that rhino poaching must be stopped; however, there are two schools of thought regarding two main approaches (in association with current strategies) to be used in order to stop or limit poaching. The first school of thought supports the CITES ban on international trade in rhino horn, and believes that rhino poaching can only be stopped by eliminating demand (the “conventional approach”). The second school of thought is in favour of the legalisation of international trade, and argues that any solutions to the rhino poaching problem must address the underlying economic forces. This is called the sustainable approach. The research aimed to investigate the effectiveness of the ban on international trade in rhino horn, as well as the viability of legalising international trade. The effectiveness of the current strategies was also investigated. A qualitative research design was used, and eighteen participants were selected in order to obtain information by means of semi-structured interviews and questionnaires.The first school of thought supports the CITES ban on international trade in rhino horn, and believes that rhino poaching can only be stopped by eliminating demand (the “conventional approach”). The second school of thought is in favour of the legalisation of international trade, and argues that any solutions to the rhino poaching problem must address the underlying economic forces. This is called the sustainable approach. The research aimed to investigate the effectiveness of the ban on international trade in rhino horn, as well as the viability of legalising international trade. The effectiveness of the current strategies was also investigated. A qualitative research design was used, and eighteen participants were selected in order to obtain information by means of semi-structured interviews and questionnaires. A literature review was also conducted, for the purpose of evaluating the responses of participants, and also for the purpose of validity and reliability. The findings indicated that the scales tip in favor of a well-managed, legalized trade, inter alia, to make funds available to rhino owners, rhino custodians and the government, on the one hand, and, on the other hand, to reduce the reward and increase the risk to the poacher. Findings also indicated that a legalized trade cannot be implemented in isolation; it goes hand in hand with increased security and improved law enforcement, while strategies such as dehorning and translocation still have a role to play. Finally, findings also indicated that communities need to be involved in the sustainable use approach. These communities are currently excluded from the benefits derived from the neighboring protected areas, thereby making them susceptible to being recruited as poachers. / Environmental Sciences / Ph. D. (Environmental Management)

This diploma thesis presents the application of theoretical concepts of agenda- setting, media framing, public opinion, spiral of silence, social change communication and social marketing, including the specifics of public interest campaigns, on the example of research project "Changing the paradigm: Smoking in restaurants bothers people" which was conducted by the Faculty of Social Sciences, Charles University and research agency Ipsos, and following media campaign against smoking in restaurants. The concept of public opinion is introduced together with the theory of the spiral of silence. In addition, the thesis deals with the issue of influencing public opinion through the media, where theories of agenda setting and media framing are illustrated on examples connected to smoking ban in restaurants. Selected theoretical concepts are shown in a reflection of new media influence. Communication of social change is introduced together with social marketing theory and aspects of health communication. The specific process of social change is introduced from the perspective of issues management. There are two case studies describing the specific phases of the research project with the media campaign in the context of the presented theory. The importance and impact of the project on the public, media and...

Le développement des réseaux de capteurs sans fil fait que chaque utilisateur ou organisation est déjà connecté à un nombre important de nœuds. Ces nœuds génèrent une quantité importante de données, rendant la gestion de ces données non évident. De plus, ces données peuvent contenir des informations concernant la vie privée. Les travaux de la thèse attaquent ces problématiques. Premièrement, nous avons conçu un middleware qui communique avec les capteurs physiques pour collecter, stocker, traduire, indexer, analyser et générer des alertes sur les données des capteurs. Ce middleware est basé sur la notion de composants et de composites. Chaque nœud physique communique avec un composite du middleware via une interface RESTFul. Ce middleware a été testé et utilisé dans le cadre du projet Européen Mobesens dans le but de gérer les données d'un réseau de capteurs pour la surveillance de la qualité de l'eau. Deuxièmement, nous avons conçu un protocole hybride d'authentification et d'établissement de clés de paires et de groupes. Considérant qu'il existe une différence de performance entre les noeuds capteur, la passerelle et le middleware, nous avons utilisé l'authentification basé sur la cryptographie basée sur les identités entre la passerelle et le serveur de stockage et une cryptographie symétrique entre les capteurs et les deux autres parties. Ensuite, le middleware a été généralisé dans la troisième partie de la thèse pour que chaque organisation ou individu puisse avoir son propre espace pour gérer les données de ses capteurs en utilisant le cloud computing. Ensuite, nous avons portail social sécurisé pour le partage des données des réseaux de capteurs / Nowadays, each user or organization is already connected to a large number of sensor nodes which generate a substantial amount of data, making their management not an obvious issue. In addition, these data can be confidential. For these reasons, developing a secure system managing the data from heterogeneous sensor nodes is a real need. In the first part, we developed a composite-based middleware for wireless sensor networks to communicate with the physical sensors for storing, processing, indexing, analyzing and generating alerts on those sensors data. Each composite is connected to a physical node or used to aggregate data from different composites. Each physical node communicating with the middleware is setup as a composite. The middleware has been used in the context of the European project Mobesens in order to manage data from a sensor network for monitoring water quality. In the second part of the thesis, we proposed a new hybrid authentication and key establishment scheme between senor nodes (SN), gateways (MN) and the middleware (SS). It is based on two protocols. The first protocol intent is the mutual authentication between SS and MN, on providing an asymmetric pair of keys for MN, and on establishing a pairwise key between them. The second protocol aims at authenticating them, and establishing a group key and pairwise keys between SN and the two others. The middleware has been generalized in the third part in order to provide a private space for multi-organization or -user to manage his sensors data using cloud computing. Next, we expanded the composite with gadgets to share securely sensor data in order to provide a secure social sensor network