68 research outputs found
Liang du yu zhou she xian ji yan zhi li zi tan ce qi
No full textLeung, Shing Chau = 量度宇宙射線及研製粒子探測器 / 梁乘宙.Thesis M.Phil. Chinese University of Hong Kong 2014.Includes bibliographical references (leaves 125-131).Abstracts also in Chinese.Title from PDF title page (viewed on 20, December, 2016).Leung, Shing Chau = Liang du yu zhou she xian ji yan zhi li zi tan ce qi / Liang Chengzhou
A review of the Internet as a alternative consumer banking channel.
No full textIn recent years, the explosion of the Internet looks set to make it an important tool not just for gathering or dissemination of information but also for the conducting of business. One of the business sectors that looks to experience great change as a results of the growth of the Internet is consumer banking. The objective of this project is to examine the possible impact of the Internet as a delivery channel on consumer banking in Singapore. Special attention is paid on the effects of Internet Banking on the way traditional delivery channels such as bank branches, telephone banking and Automated Teller Machines will be used be consumers to carry out their banking transactions and employed by banks to deliver their products
Defending IEEE 802.11-based networks against denial of service attacks
No full textThe convenience of IEEE 802.11-based wireless access networks has led to widespread deployment in the consumer, industrial and military sectors. However, this use is predicated on an implicit assumption of confidentiality and availability. In addition to widely publicized security flaws in IEEE 802.11's basic confidentially mechanisms, the threats to network availability presents any equal, if not greater danger to users of IEEE 802.11-based networks. It has been successfully demonstrated that IEEE 802.11 is highly susceptible to malicious denial-of-service (DoS) attacks targeting its management and media access protocols. Computer simulation models have proven to be effective tools in the study of cause and effect in numerous fields. This thesis involved the design and implementation of a IEEE 802.11-based simulation model using OMNeT++, to investigate the effects of different types of DoS attacks on a IEEE 802.11 network, and the effectiveness of corresponding countermeasures.Approved for public release; distribution is unlimited.Major, Republic of Singapore Navyhttp://archive.org/details/defendingieeebas10945613
Impact of perceived moral intensity and perceived consumer risk on consumers' moral judgement and purchase intention for pirated software.
No full textThis study extended Jones's (1991) issue-contingent model by including perceived risk concept for investigating an issue of consumer software piracy (consumer intention to purchase pirated software), and their moral judgement for the issue. Scenario-based questionnaire approach is used to gather the data and the findings yield overall support for the hypotheses
Zai quan qiu hua dian ying zhong huan xiang yang gang qi zhi: Xianggang nu xing dui man wei yu zhou de jie shou yan jiu
No full textM.Phil.The study is a search for the analysis of the globalization of superhero fantasy through zooming in Hong Kong women's reception of the Marvel Cinematic Universe (the MCU). Hong Kong women's reception is chosen because it denotes two distinct but also entwined types of reception, that is, the Hong Kong local reception under the globalization of Hollywood movie and women's reception of the masculine film text. On the one hand, locally situated, their reception is always understood as the victim's experience under the ideology of Americentrism encoded in the superhero genre. On the other hand, as a group of female audiences, they are haunted by the local patterns of gender relations, which, in many senses, are oppressive to them. The study, in view of this double oppression, pays attention to the tactics they employ to negotiate with the interweaving ideological forces. Conducting ethnographic research with 11 female informants while focusing on their reception of male and female masculinity represented in the MCU, I suggest that the female audience's agencies are not necessarily progressive and liberal but rather full of tensions in terms of the politics of gender and sexuality. Confronting with the female masculinity performed by the MCU superheroine characters, they consciously prefer the performance which combines both the normative ideas of manhood and womanhood to what they categorize as "excessive masculinity." In other words, womanhood is reserved as the institutional ground upon which female masculinity is allowed to be embodied. Likewise, homophobia and postcoloniality of white masculinity together constitutes the female audience's "he-he fantasy," which refers to the ambivalent attitudes towards white male masculinity as both the unidentifiable other and identifiable subject. In general, although the Hong Kong female audience's agencies may not be fully subversive, the female audience harnesses, through using he-he fantasy and constraint of the female ii masculinity as their repetitive strategies, other sets of ideologies to negotiate with the oppression imposed by the interweaving ideological forces of globalization and local patriarchy.本論文通過香港女性對漫威電影宇宙（下稱漫威）的觀眾接收研究，探討超級英雄幻想的全球化。香港女性觀眾的接收標示了兩種纏繞交錯的接收模式：荷里活電影全球化下的本地接收及陽剛電影文本下的女性接收。一方面，她們的對漫威接收常被界定為一種美國中心主義的受害者經驗；另一方面，作為女性觀眾，她們不斷被本地的性別關係壓逼。基於這雙重壓逼，本研究關注香港女性觀眾與這兩種交纏的意識形態磋商的策略。通過與11名女性觀眾進行民族誌研究，本研究聚焦於她們如何策略地接收漫威中再現的女性及男性陽剛氣質。而這些策略及當中展現的能動性並非全然指向性／別政治的進步及自由，反而是充滿張力。面對著漫威超級女英雄的陽剛氣質，她們有意識地認同能夠同時表現女性氣質及男子氣概的角色，並排斥她們定義的「過剩陽剛氣質」。換言之，女性陽剛氣質必須在女性特點能充分被再現的前提下，方能被香港女性觀眾認同。另一方面，恐同以及白人陽剛氣質的後殖民性共同建構了香港女性觀眾的「he-he 幻想」。在這幻想中，超級英雄同時為可認同的主體及不可認同的他者。總括來說，儘管香港女性觀眾的能動性對交纏的意識形態並非完全地顛覆，但通過限制超級女英雄的陽剛氣質及「he-he 幻想」作為接收策略，她們利用了其他意識形態的動力來與全球化及本地父權強加的壓迫進行協商。Lee, Chi Shing.Thesis M.Phil. Chinese University of Hong Kong 2019.Includes bibliographical references (leaves 146-164).Abstracts also in Chinese.Title from PDF title page (viewed on 25, November, 2020).Lee, Chi Shing
Service quality of 5 major sectors in Singapore.
No full textIdentification of the weaknesses in service of the 5 sectors; Banking, Food & Beverage, Healthcare, Public Transport and Retail. An analysis of the root causes to these weaknesses. Re-enactments of bad and good services in video
Autonomic computing for exception management in supply chains ( part 2 )
No full textThis project investigates how continuous and discrete control theory may be applied to model, monitor and control a supply chain based on performance indicators such as rapid inventory recovery and order rate recovery.
The first part of the project analyzed supply chains in the continuous time domain. The behaviour of current models i.e. Automatic Pipeline Inventory and Order Based Production Control System (APIOBPCS) model and Inventory Order Based Production control system (IOBPCS) were modelled in MATLAB®. The influence of the different parameters inventory level recovery rate, Ti, demand averaging rate, Ta, and WIP adjustment rate, Tw, on performance indicators [ i.e 1) rapid inventory recovery and 2) order rate recovery ] were investigated. Ti, inventory level recovery rate, has a greater influence on both the response of inventory level recovery and order rate, ORATE, recovery. The introduction of WIP policy offers an additional option of damping and increasing the response of both the ORATE and inventory level response.
An existing literature examined the possibility of discretizing a continuous time model. the discrete model was found to most closely resemble real life situation. Inspired by this notion, the author investigated into the possibility of modelling The APIOPBCS model in the discrete time domain. The discrete time APIOBPCS model was verified by comparing the transient behaviour of the discrete models against that of the continuous model. Simulations showed Tustin and first order hold methods are able to replicate the transient behaviour of the continuous model more accurately.
While the discrete models follow the general trend of the continuous model, the Tustin model better achieved the target performance indicators while the Backward Rectangle approximation did not. The effect of different lead times on the transient behaviour of the models was also investigated. It was found that the characteristics of the models were consistent and independent of the variation of the lead times.Bachelor of Engineering (Mechanical Engineering
Yuan gong gong zuo zhu dong xing zhi li bi tan
No full textPh.D.Research interest in employee proactivity has been flourishing these years. Proactive work behavior (PWB) refers to employees self-initiated and anticipatory actions that aim to bring forth positive change in the immediate work environment. The received wisdom in the literature is that employee PWBs are vital and beneficial for individuals and organizations. Researchers, thus, have paid great efforts to investigate how to encourage employee PWBs. However, a couple of researchers pointed out that PWBs could have both benefits and costs for individuals, teams, and organizations, and we might get only one side of the story and provide problematic advice to practice if lacking a comprehensive understanding of the phenomenon.In this dissertation, I explore both the positive and negative sides of employee PWBs in two separate but related studies, looking into the perspective of employees who engage in PWBs themselves in Study 1 and from the lens of coworkers in team context in Study 2. In Study 1, I focus on the influence of engaging in PWBs on the actor’s well-being in a dynamic sense. Drawing on the conservation of resources framework, I propose an integrative model of the benefits and drawbacks of employee PWBs for the actors regarding multiple indicators of well-being on a daily basis and posit important contingencies that affect the double-edged sword effect. I examined the impact of conducting PWBs on employee well-being on a daily basis with an experience sampling study. Results from 172 employees and 1,356 matched data supported that engaging in PWBs had a negative indirect effect on well-being (represented as emotional exhaustion and job satisfaction) through regulatory resource depletion but, at the same time, had a positive indirect relationship with daily well-being through heightened state pride. The results further showed that positive and negative feedback of PWB from colleagues (within-person level) and OBSE (between-person level) moderate the above effects.In study 2, I explore the social consequences of PWBs in work teams from the lens of coworkers. Employing the warmth-competence model, I investigate how coworkers view and react to focal employee’s proactivity at work and how team context may play a critical role to make a difference. Analysis of multi-wave, multi-source survey data from 237 employees in 59 work teams demonstrated that PWB is positively related to coworkers’ competence perceptions and the focal employee’s informal leadership emergence; however, performing PWBs has a negative relationship with coworkers’ warmth perceptions of and support to the focal employee in work teams with low initiative climate.In brief, these results support my overarching theorization that PWBs, as challenging behaviors that take place in a social system, can have both benefits and drawbacks for actors and from the lens of coworkers in work teams. Individual and team characteristics play vital roles in moderating the double-edged sword effect of employee proactivity at work.近些年，學者對於員工工作主動性一直頗有研究興趣。主動工作行為(Proactive work behavior, PWB)是指員工在工作中從事的有預期性的、自發性的工作相關行為，旨在為所在的工作環境帶來積極的變化。從現有文獻中我們學到的智慧是，員工主動工作行為對於個人和集體都很有益因而很重要。據此，大量研究關注在如何提高和鼓勵員工主動工作行為。然而，近年來一些學者指出，員工主動工作行為對個人和集體都可能既有好處亦有壞處，如果我們缺乏對這些利弊的全面理解，則會片面地理解現象并可能對管理實踐帶去有問題的建議。在本研究中，我在兩個獨立但相連的子研究中探索了員工主動工作行為的利與弊，研究一是從從事主動工作行為的員工本人視角出發；研究二是從團隊背景下同事的視角出發。在研究一中，我著重從動態角度探索從事主動工作行為對員工本人日常工作幸福感的影響。基於資源節約理論框架，我提出了一個日常從事主動工作行為對員工每日福祉有雙刃劍影響的模型并提出了影響雙刃劍效應的重要調節因素。我通過一個經驗抽樣調查來驗證提出的理論模型。來自172名員工的1,356個匹配的數據點表明員工日常主動工作行為透過自我調節資源消耗對日常幸福感(表現為情緒枯竭和工作滿意度)產生負面的間接效應，但與此同時，員工日常主動工作行為通過帶來自豪感對日常幸福感產生積極的間接效應。研究結果進一步表明，同事對員工日常主動工作行為的正面和負面反饋和員工的基於組織的自尊會對上述效應有影響。在研究二中，我從工作團隊背景下的同事視角探討了個體員工主動工作行為帶來的社會性結果。應用刻板印象內容模型，我關注同事看待焦點員工的主動工作行為及相應反應，以及團隊背景如何發揮重要作用影響上述關係。來自59個工作團隊的237名員工進行的多時點非同源調查數據分析結果表明，員工主動工作行為的程度透過同事對其能力的感知對其在團隊中非正式領導力的生成有積極作用，然而，在主動性氛圍低的工作團隊中，員工主動工作行為的程度會透過降低同事對其友善度的感知從而對同事支持有負面作用。上述研究結果總體上支持了我的理論化假設，及員工主動工作行為作為社會系統(如工作團隊)中發成的有挑戰性的行為從員工自身和工作團隊中的同事視角來看都有利有弊，而具體操作實踐及員工個人和團隊的一些特征在調節員工主動工作行為的雙刃劍效應中都起到重要的作用。Zhang, Jun.Thesis Ph.D. Chinese University of Hong Kong 2018.Includes bibliographical references (leaves 94-117).Abstracts also in Chinese.Title from PDF title page (viewed on …).Zhang, Jun
Zai xian she jiao wang lu fen xi: tu xing ji shu he she qu tan suo
No full textPh.D.Analyzing properties of online social networks (OSNs) has attracted extensive attention because of their increasing popularity, significant importance, and diverse applications. In this thesis, we focus on graphlet counting and community exploration in online social networks. Graphlet counting aims to characterize the local topology properties of OSNs, which can be leveraged for better design of future OSNs. Community exploration seeks to gather as many members of social communities as possible, which has various real-world applications such as online advertising.Firstly, we consider the restricted access situation where the graph topology is not readily available so one has to resort to web crawling using the available application programming interfaces (APIs). We propose a general and novel Markov Chain Monte Carlo (MCMC) framework to estimate graphlet statistics of “any size”. Our framework is based on collecting samples through consecutive steps of random walks. We derive an analytical bound on the sample size (via the Chernoff-Hoeffding technique) to guarantee the convergence of our unbiased estimator. To further improve the accuracy, we introduce two novel optimization techniques to reduce the lower bound on the sample size. Experimental evaluations demonstrate that our methods outperform the prior stateof-the-art method up to an order of magnitude both in terms of accuracy and time cost. We also demonstrate the application of graphlet statistics in measuring the similarity of OSNs.Secondly, we propose an improved MCMC method to estimate graphlet counts under the restricted access assumption. Compared with the general MCMC framework mentioned before, the improved method solves the more general problem, i.e., counting graphlet frequencies. The improved method generates samples by leveraging consecutive steps of the random walk as well as by observing neighbors of visited nodes. Using the importance sampling technique, we derive unbiased estimators of the graphlet counts. To make better use of the degree information of visited nodes and their neighbors, we also design improved estimators, which increase the accuracy of the estimation at no additional cost. We conduct extensive experimental evaluation on real-world OSNs to confirm our theoretical claims. The experiment results show that our estimators are unbiased, accurate, efficient and better than the state-of-the-art algorithms.Thirdly, we consider the graphs manifesting as streams, where edges appear one by one in arbitrary orders. We design a general framework to estimate the real-time global and local graphlet counts in graph streams. Our unified framework is to estimate, at any time instant, the graphlet counts of the whole graph as well as the graphlet counts of individual nodes under the streaming setting. Our framework subsumes previous methods and also provides a more flexible and accurate global graphlet count estimation. We are also the first to propose an efficient method to compute the local graphlet counts under the streaming setting, which is a more challenging problem than the computation of global graphlet counts. We propose a general unbiased estimator which can be applied to any k-node graphlets. Furthermore, an efficient implementation is provided for the 3, 4-node graphlets. We perform a detailed empirical study on real-world graphs and show the effectiveness of our framework.Lastly, we introduce the community exploration problem that has many real-world applications such as online advertising. In the problem, an explorer allocates limited budget to explore communities so as to maximize the number of members he could meet. We provide a systematic study of the community exploration problem, from offline optimization to online learning. For the offline setting where the sizes of communities are known, we prove that the greedy methods for both of non-adaptive exploration and adaptive exploration are optimal. For the online setting where the sizes of communities are not known and need to be learned from the multi-round explorations, we propose an “upper confidence” like algorithm that achieves the logarithmic regret bounds. By combining the feedback from different rounds, we can achieve a constant regret bound.隨着在線社交網絡（OSNs）的日益普及，分析社交網絡的屬性由於它的重要性和應用性已經引起了廣泛的關注。文中，我們專注於研究社交網絡中的圖形計數和社區探索。圖形計數旨在表徵社交網絡的本地拓撲屬性，這些性質可以利用它們更好地設計未來的OSN。社區探索目的在於發現盡可能多的社會團體中的成員,各種現實中的應用比如在線廣告都離不開社區探索。首先，我們考慮圖數據不可以隨意訪問，而只能通過應用程序接口（API）訪問的情況。我們提出了一個通用和新穎的馬爾可夫鏈蒙特卡羅（MCMC）框架估計任意大小的圖形的統計數值。我們的框架基於通過連續的隨機遊走來收集採樣樣本。爲了保證估計器的收斂性和精確度，我們採用Chernoff-Hoeffding這樣的分析工具來計算最少的保證精確度的採樣樣本大小。為了進一步提高準確性，我們引入了兩個新穎的優化方法來減少所需要的樣本量。實驗評估表明我們的方法在準確性和時間成本方面都優於之前的最先進的方法。我們還展示了用圖形統計數據來測量不同社交網絡之間的相似度。其次，在同樣的API訪問限制下，我們提出了一種改進的MCMC方法來估計圖形計數。與前面提到的通用的MCMC框架相比，改進的方法解決了更普遍的問題，即計算圖形的具體個數。改進的方法通過連續的隨機遊走和已經被訪問節點的鄰居，來獲得採樣樣本。我們通過重要性抽樣（importance sampling）導出圖形計數的無偏估計。爲了更好地利用被訪問節點以及他們鄰居的度數信息，我們設計了改進的估計器。改進的估計器可以在不增加計算代價的情況提高估計的精確度。我們利用現實世界的OSN對我們提出的方法進行了廣泛的實驗評估以確認我們的理論的正確性和方法的有效性。實驗結果表明我們的方法比最先進的算法偏差更小，效率更高。接下來，我們考慮圖以數據流的形式出現。這種情況下，圖中的邊以任意的次序一條接一條地出現。我們設計了一個通用的框架來實時地估計圖數據流中全局的圖形個數，和每一個節點的局部的圖形個數。我們的框架囊括了以前的方法，同時也提供了更靈活和準確的方法全局圖形計數估計。我們首次提出了在圖數據流裏面有效計算局部圖形個數的方法。計算局部圖形個數比計算全局圖形數量更加具有挑戰性。我們提出的估計器適用於任意大小的圖形。而且，我們對節點個數爲3或者4的圖形，提出了具體的實現算法。我們通過大量的在實際社交網絡上的實驗展示了我們框架的有效性。最後，我們介紹了具有許多現實世界應用的社區探索問題。在這個問題中，探索者會分配有限的預算來探索社區，以最大限度地發現新的社區成員。我們從離線優化到在線學習對社區探索問題進行了系統研究。在社區的規模都知道的情況下，我們證明了貪心算法可以獲得最優的資源分配，貪心策略是最優的自適應（adaptive）探索策略。在社區規模未知，需要通過多倫學習的情況下，我們提出了類似“最高置信度”（upper confidence bound）的算法來實現對數的遺憾（regret）值。通過利用之前探索的反饋，我們可以保證遺憾值不超過一個常數。Chen, Xiaowei."October 2018."Thesis Ph.D. Chinese University of Hong Kong 2019.Includes bibliographical references (leaves 237-246).Abstracts also in Chinese.Title from PDF title page (viewed on …).Chen, Xiaowei
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