IEEE 802.11 wireless networks are plagued with problems of unauthorized access. Left undetected, unauthorized access is the precursor to additional mischief. Current approaches to detecting intruders are invasive or can be evaded by stealthy attackers. We propose the use of spectral analysis to identify the type of wireless network interface card (NIC). This mechanism can be applied to support the detection of unauthorized systems that use NICs which are different from that of a legitimate system. We focus on two functions, active scanning and dynamic rate switching, required by the 802.11 standard that are implemented in the hardware and software of the wireless NIC. We show that the implementation of these functions influence the transmission patterns of a wireless stream that are observable through traffic analysis. Furthermore, differences in the behavior of a wireless stream caused by differences in the implementation of these functions are exploited to establish the identity of a NIC. Our mechanism for NIC identification uses signal processing to analyze the periodicity embedded in the wireless traffic caused by active scanning and rate switching. A spectral profile is created from the periodic components of the traffic and used for the identity of the wireless NIC. We show that we can discern between NICs manufactured by different vendors and NICs within the same manufacturer using the spectral profile.

In recent years, Small- and Medium-sized Enterprises (hereafter called SMEs) have emerged to become an important factor for Vietnam¡¦s rapid economic growth. The environments in which these SMEs operate are speedily changing with the internationalization of the Vietnamese economy. Prompt changes have brought both opportunities and threats for the fragile SMEs section in Vietnamese economy. The purpose of this research is to answer ¡§What are the solutions for Vietnamese SMEs after going in the globalization process?¡¨ This paper indicates solutions (chiefly financial solutions) for challenges lie ahead if the plans for further trade liberalization and internationalization are realized. The basis of this paper¡¦s analysis is a database on the activities of some Vietnamese SMEs in a period of 2007-2009, with quantitative data about various aspects of company operations, as well as qualitative information about the entrepreneurs¡¦ perceptions of the current business environment and expectations about the future. In the survey¡¦s results, I have found a model of the internationalization of SMEs has been created which includes some elements: financial keys, governmental role, and other supporting organization. In which, access in finance has appealed as a key element for small and medium enterprise regarding the scope research of the survey. I believe they are main considerations for the Vietnamese SMEs to maintain, survive and develop their business operation after going globalization. Optimize financial solutions as suitable way to entry foreign market, government support; determine own Competitive advantage, positioning, decision-making and controlling.

Resistive Random Access Memory (RRAM) is considered as the most promising candidate for the next-generation nonvolatile memories due to their superior properties such as low operation voltage, fast operation speed, non-destructive read, simple metal-insulator-metal (MIM) sandwich structure, good scale-down ability. The main targets of this research are to clarify the corresponding physical mechanism, develop the potential material and structure of RRAM and stabilize the resistive switching characteristics, in which clarifying the physical mechanism will be the key factor for RRAM into production in the future. Recent research has suggested that variation of the low and high resistance states in RRAM could be caused due to the by instability in the formation and /disruption of the filament. In addition, the endurance and stability of RRAM may be related to the dissipation of oxygen ions in the switching layer. In this study, new material (Si Introduced) and structure (oxygen confined layer) are employed to improve RRAM performance and to clarify the physical mechanism. Furthermore, constant switching energy results can be used to select the optimal materials and structures also can be used to correctly allocate voltage and time to control RRAM. The detail physical mechanism is studied by the stable RRAM device (Ti/HfO2/TiN) which is offered from Industrial Technology Research Institute (ITRI). The switching process is proved as the formation/disruption of the filament. Furthermore, the dynamic switching behaviors during reset procedure in RRAM were analyzed by the sequential experimental design to illustrate the procedure of atomic quantized reaction at the ultra-cryogenic temperature.

The Internet and web service have become the most popular platform and application of the Client-Server model due to the universality of the network recently years. Its growth is beyond the imagination, many traditional service have changed into web service stage by stage, and the load of the servers become more and more heavy. In the situation the server architecture must be adapted oppositely. The web cluster architecture that has the advantages of scalability, reliability and high performance requirement, is used extensively. In our lab developed and implemented a mechanism termed Content-aware Distributor, which is a software module for kernel-level extension, to effectively support content-based routing. Based on the achievement of the software-based Content-aware Distributor; we design and implementation a content management system for backend servers. The content management system provides a user friendly management console to allow a administrator to manage the whole cluster system. The content management system also monitors backend servers periodically, when server is awarded to be overloaded, the content management system will replicate popular content to other servers automatically. By this way cluster system can balance load of back end servers and increase system performance and throughput.

In this paper, we propose a novel information-theoretical fairness metric to evaluate the fairness of bandwidth allocation to distributed nodes in local area network. When the source traffic pattern is fixed, the proposed metric is a mapping from the set of all medium access control (MAC) protocols to the interval [0,1] in the real line such that a larger value corresponds to a MAC protocol that allocates bandwidth more fairly. The metric is applicable for a wide range of medium access control schemes including those in which the packet lengths are not identical and/or multipacket reception (MPR) capability is available. To verify the correctness of the novel metric, we use it to evaluate the fairness levels of an IEEE 802.11 wireless LAN composed of homogeneous or heterogeneous nodes. Our simulations indicate that for the IEEE 802.11 protocol, the short-term fairness level is low while the long-term fairness level is high. The information-theoretical fairness metric leads to a conclusion that is consistent to the previous finding in the lecture.

The SRAM memory generator in this thesis is divided into four parts: row decoder, storage cell, column decoder, and sense amplifier & write controller. The row decoder is designed using pass-transistors logic with better area and regularity compared with conventional NAND based decoders. Two different column decoders, tree structure and NOR based predecoder, are provided in current version. Although only SRAM is implemented in this thesis, the memory generator platform is complete with all the necessary models required in the embedded design. In the future, other memories, such as cache, shift register, FIFO, stacks, ROM, register files, and content addressable memory, can be integrated in this memory generator platform.

The digital era has brought enormous changes to traditional industries, among which the music industry has been particularly hard hit. Unauthorized downloading and file-sharing on the internet has significantly threatened the viability of the music industry. Reduced sales, as much as one-tenth of previous sales, have caused closure of many companies. The market territory has also shifted constantly. The future of the music industry relies on how it can address these changes. In addition, the rise of wholesale retailers that emphasize lower costs and quantity price discounts has also worsened the prospect of the music industry. Traditional music retailers have little profit margins to compete with these chained wholesale retailers. Losing market access, the sales and profits for pop music continue to decline, let alone "non pop" music, such as Buddhist music. The author has been a producer of Buddhist music for years and runs the Buddha Cloud Music Production House. Facing these changes, in this thesis he presents a new marketing strategy, deviated from traditional business sequence of production, recording, marketing, and retails. This strategy includes: (1) directly promoting his works to Buddhist temples; (2) marketing through mass media, such as newspapers and Buddhist TV channels; and (3) a total access marketing approach using online e-business programs. The author details how he used this strategy to successfully promote his works of Buddhist music produced in his studio. It is expected that the proposed strategy can shed some light on the marketing of other industries that face similar challenges.

The Cable Television Channel Planning and Management Regulations, which was promulgated on December 13 in 2004, indicate clearly that each cable station¡¦s third channel is ¡§the public channel¡¨ to practice community people¡¦s ¡§media access rights¡¨. Its major purposes are to protect the freedom of speech, to ensure citizens having channels to express their opinions, and to facilitate the diverse social developments. Theoretically, public access channel should be viewed as the public sphere. Practically, due to the characteristics of local cable television, it is expected to preserve local culture, to educate the local people the functions of regional media, and to contribute to community development. Especially in today Taiwan¡¦s media environment, most media are controlled by the political and business forces and vested interest organizations, the local voice could not be heard in the mainstream media. This survey chose the public accessible channel 3 of the local cable stations in Tainan County (thereinafter referred as Tainan County Third Public Television Service) as study objects. There were three purposes of this study¡Xfirst of all, to understand the current situation of public access channels operated by local cable television stations and how public access channels apply to public affairs; second, to propose the appropriate operational modes for cable television stations by evaluating the difficulties and problems of practicing public affairs; and third, to discuss how public policy could be extend and constructed to create community interaction and hence a citizen society by exploring the interaction between local government and media and analyzing the best operational mode of public access channel. The results of this study indicated that due to the mutual interest structure of politics and businesses, the local government does not fulfill the role of administrator. The responsibility of media to promote civic society was abandoned or fulfilled just merely nominal by the local cable television owners. The channel for public participation is turned back to the communities. Based on the findings of this study, there are two suggestions for policy revision: first, amending the Cable Radio and Television Law and enacting the clauses of rewards and punishments for channel management to ensure the participation of public affairs; second, the public access channels of cable television stations should serve as a platform for video production for the public. This study mainly explored the possibility of using the public access channels of cable television to practice public affairs. Due to the scopes and limits of research design, the case examined was limited to the case of Tainan County. Advance studies could be focused on the performance of the provision of programs (i.e. programs in social community education, etc.) to contribute to the public sphere and civic society.

Taiwan became a member of the WTO in November last year. This helped push Taiwan to the International business circle successfully; also it helped all the Taiwanese businesses to grow positively, but Taiwan would face strong international competition as well. This essay is about how Taiwan¡¦s rice policy will react and adjust to the strong international competition after joining the WTO. Also we will talk about how the rice policy of Taiwan revolves into what it is today since WWII. We will look at the good and the bad from previous policies, so we can create better agricultural policies for now, and better the economy of Taiwan¡¦s rice business for the future. The problem that Taiwan is facing now is the policy of limited quota. We have to follow the rule of ¡¥minimum access¡¦ once we join the WTO. The import number of brown rice in 2002 is 8% of the total amount consumed in Taiwan from 1990 to 1992. According to the statistics from the Food Bureau of Taiwan, The total consumption of brown rice in Taiwan in 1990, 1991, and 1992 are; 1,834 thousand tons, 1,897 thousand tons, and 1,694 tons. If we count the grain it would be approximately 2,260 thousand tons. If we use the minimum access policy, 8% of it would be 180 thousand tons of grain. If we do not have the proper ¡¥Tie-in sales¡¦, the price of local rice sales and the amount the farmers earn would fall drastically. Tie-in sale is actually a short-term solution. In the long term, Taiwan¡¦s rice policy will lead to results with tariff. At this moment, the price of Taiwanese rice would not be under any protection, so the most important thing is to raise the ability to compete internationally for Taiwan¡¦s rice. The result, after a careful examination, is that Taiwan is no competition with the U.S., Thailand, and China on the price aspect. Besides from that, the personnel and the space of land cost much higher than the other countries make Taiwan hard to compete. The only way is to raise the quality above the other competition then we can actually have a place to compete with the rest of them. At the same time, if we can create a large-scale center for tie-in sales, it should help lowering the base cost of grain rice. As for the government, it should change the policies to assist with the rice farmers. Transform the current guaranteed purchasing policy for guaranteed price , to direct payment , which should help Taiwan¡¦s rice market to market suitable diversion and reduction ,would minimize the impact actually. . In the future, the rice farmers will grow rice for consumers, not for the needs of the government. The agriculture of rice will go back to the natural market rule; the rice farmers will work with the government to develop higher quality rice. Joining the WTO brings both good and bad to the grain rice industry, so if we can take chances at the right times and avoid risks, we can be in the business for a long time.

Certain scientific application domains, such as High-Energy Physics or Earth Observation, are expected to produce several Petabytes (220 Gigabyes) of data that is analyzed and evaluated by the scientists all over the world. In the context of data grid technology, data replication is mostly used to reduce access latency and bandwidth consumption. In this thesis, we adopt the typical Data Grid architecture, three kinds of nodes: server, cache, and client nodes. A server node represents a main storage site. A client node represents a site where data access requests are generated, and a cache node represents an intermediate storage site. However, the access latency of the hierarchical storage system may be of the order of seconds up to hours. The static replication strategy can be used to improve such long delay; however, it cannot adapt to changes of users¡¦ behaviors. Therefore, the dynamic data replication strategy is used in Data Grids. Three fundamental design issues in a dynamic replication strategy are: (1) when to create the replicas, (2) which files to be replicated, and (3) where the replicas to be placed. Two of well known replication strategies are Fast-Spread and Cascading, which can work well for different kinds of access patterns individually. For example, the Fast-Spread strategy works well for random access patterns, and the Cascading strategy works well for the patterns with the properties of localities. However, for so many different access patterns, if we use a strategy for one kind of access patterns and another strategy for another kind of access patterns, the system may become too complex. Therefore, in this thesis, we propose one strategy which can work for any kind of access patterns. We propose a replication approach, a Different Threshold (DT) approach to data replication in Data Grids, which can be dynamically adapted to several kinds of access patterns and provide even better performance than Cascading and Fast-Spread strategies. In our approach, there are different thresholds for different layers. Based on this approach, first, we propose a static DT strategy in which the threshold at each layer is fixed. So, by carefully adjusting the difference between the thresholds Ti, where i is the i-th layer of the tree structure, we can even provide the better performance than the above two well-known strategies. Moreover, among large amount of different data files, there may exist some hot data files. Those files which have been mostly requested are hot data files. To reduce the number of requests for the hot files, next, we propose the dynamic DT strategy. In the dynamic DT strategy, each data file even has its own threshold. We let data replication of hot files occur earlier than others by decreasing the thresholds of hot files earlier than the normal ones. From our simulation results, we show that the response time in our static DT strategy is less than that in the Cascading and the Fast-Spread strategies. Moreover, we can show that the performance of the dynamic DT strategy is better than that of the static DT strategy.