OPERATIONS OF APPLE FOLLOWING THE IDEA OF NICCOLO MACHIAVELLI Essay

OPERATIONS OF APPLE FOLLOWING THE IDEA OF NICCOLO MACHIAVELLI - Essay Example Machiavelli, in â€Å"The Prince†, describes that a prince is not the same with the people whom he rules; rather, he poses a greater stature in the society. Expanding this vision propounded by Niccolo Machiavelli, the principles of ruling and managing a mass of individuals can also be deemed as applicable in modern organizational field of operations. In this regard, Machiavelli’s description of the qualities of a prince or a person or a corporation can be viewed as similar to that of modern day organizations, having its operations and influencing factors networked in the realms of politics, regulatory as well as economic and certainly in social paradigms as well. Moreover, as Machiavelli precisely mentions that gaining goodwill of the citizen is quite important with regard to rule properly with utmost effectiveness, his principles can be argued as justifiably applicable in 21st century organizational context where sustainability and moral principles are supposed to be o ne of the prime concerns. THESIS STATEMENT Critically analyzing the strategic operations of Apple Inc., this thesis will aim at discussing those bases or grounds where Apple’s operations follow the principles affirmed by Machiavelli and those opposing Machiavelli’s viewpoints. In addition, justifications will also be delivered on the inferences drawn so as to gain an in-sight to the concerned issue in this thesis. OPERATIONS OF APPLE FOLLOWING THE IDEA OF NICCOLO MACHIAVELLI Today, Apple is renowned as one of the leading Information Technology (IT) companies of the world. With its worldwide operations, the company has emerged as one of the most successful and renowned brands. It is in this context that alignment of the operational approach of Apple with that of the ideas presented by Machiavelli in ‘The Prince’ is quite likely to reward a succinct understanding of the possible influences, which can be reasoned as the causes of Apple’s success to dat e. In precise, Machiavelli describes about various principles of ruling, keeping in concern the autocratic system of the then scenario, i.e. of the 15th century. The principles thereby depict about the methods to be followed with regard to govern and maintain power in a particular demographic region, which can also be characterized as organizational environment in today’s context. Notably, sustainability constitutes major significance in these principles, in the form of the morally sound attitude deciphered by the ruler through his works, human behavior influenced by their heredity and surrounding environment as well as demand for transparency in the entire working process by both the ruler and those who are ruled. In accordance with this principle, Apple’s operations all over the world, intended to capture maximum share of the technology industry, can be found as emphasized on ethically sound principles rendering high priority to its customers’ needs, in accord ance with its stakeholders’ and organizational needs (Reuters, â€Å"Apple Inc (AAPL.OQ)†). Heading towards being more argumentive, the principles in Machiavelli’s â€Å"The Prince† depict that hereditary princedom is much beneficial from new princedom as it assures greater loyalty from the followers. Contextually, Apple is one of those companies that intend to operate in the competitive market in which they are present as a strong brand, following its hereditary princedom. This may also be considered as a major reason as to why Apple has been quite reluctant in reaching to the various non-competitive markets in the global realm. As Machiavelli argues, trusting in hereditary princedom is one such aspect that enables a prince to maintain his power and attain highest possible

Alcoholic Fermentation Lab Report Example | Topics and Well Written Essays - 1250 words

Alcoholic Fermentation - Lab Report Example In alcoholic fermentation, the initial process is the breakdown of glucose. The cell breaks down glucose to produce energy in the absence of oxygen. The process is called glycolysis and takes place in the cytosol of the cell.The energy released from this reaction is useful in the conversion of NAD+ to NADH. The energy is also used in binding ADP to inorganic phosphates. Production of two pyruvate molecules follows. Breakdown of the two pyruvate molecules takes place leading to the production of two acetaldehydes and two CO2 as a waste product. It then follows that the two acetaldehydes undergo the conversion to two ethanol using the H+ ions from NADH, which is converted back to NAD+.Alcoholic fermentation has many applications. Some of these applications are the production of ethanol fuel, in bread baking, in the fermentation of foods such as milk and vegetables and the production of alcoholic beverages such as wine and beer. Despite the fact that the general principle of fermentatio n is the same for all products, the method of achieving it and the end results differ. Beer preparation by fermentation involves picking rye, wheat or barley followed by germinating, drying and pulping it into a mash. The mash is mixed together with hot water and transferred to a fermentation vessel to commence the process of fermentation. Yeast is added to the mixture that converts the sugar present in the ash to carbon dioxide and alcohol. Once the beer is filtered and conditioned, it is ready for consumption.

Opening a fast-food franchise Essay Example for Free

Opening a fast-food franchise Essay Opening a fast-food franchise can be a very rewarding venture. Consumers ate as much as US$110 billion worth of fast-food in the United States in year 2000 alone, a dramatic increase from only US$6 billion in 1970. According to The National Restaurant Association, this trend continues to be observed as fast-food sales grow at a rate of 5% per annum to an estimated US$163 billion by the end of 2007 (Maxwell, 2003). This gives us the idea that a fast-food franchise is potentially a very profitable business option. However despite this implication, an average of three out of twenty-five franchises of major fast-food corporations close down at the end of every fiscal year (Maxwell, 2003), which tells us that merely opening a fast-food franchise does not guarantee success in the business. Therefore there is a need to follow certain guidelines in order to increases the chances of succeeding in the fast-food business venture. The first step is selecting an appropriate fast-food site. This could be a piece of property that you own or intend to lease. It is of prime importance that you first evaluate whether or not your intended site is fit for a fast-food franchise. Some franchisors require you to follow specific guidelines in selecting a site while others may even require you to merely choose from a list of sites that they offer. Sound evaluation of a prospective site involves a scrutiny of 1. ) sanitation, 2. ) consumer base, and 3. ) competition (Hogan, 1997). A fast-food site must be in an area that is relatively sanitized. You should never choose a site that is next to a junkyard or other similar structures. The best sites are located in places that have obvious potential consumer bases such as near a school where the school’s students and faculty members might comprise a commanding consumer base. Unfortunately, there are usually other fast-food outlets already installed in the best of fast-food site areas, which makes it important for you to first analyze the level of competition in the immediate area and whether you would be able to stand up to it. The second step is to select an appropriate franchisor (Hogan, 1997). The fast-food that you will choose should be in demand to your prospective consumer base. You can conduct a survey on the food preferences of people in your prospective site in order to have a better idea of which franchisor to select. It is also important to select a franchisor that has a well popularized trademark and a proven formula for good business. This is the main advantage to buying a franchise as opposed to starting a new fast food joint from scratch. Aspects of a fast-food franchisor such as advertising, good will, and favorable sanitation reports all trickle down to individual franchises. Furthermore, a well run franchise should be able to assist a franchisee on everything, from site selection and even lease negotiation to staff training, ingredients advisory and operations monitoring. The last step is to make the proper arrangements with your selected franchisor (Hogan, 1997). This involves settling a number of fees including those for initial franchise, royalties, and other miscellaneous fees for advertising and promotions. This step also includes hiring and training required staff and setting up the selected site. With all those taken cared of, what remains to be done is to procure stock for the food to be served and then you are good to go. Franchising is a potentially profitable business option. Anyone who is thinking about making such a venture should first look for an appropriate site and select a reliable franchisor before going into the detail of making final arrangements of setting up a franchise.

Wireless Sensor Networks: Applications and Forms

Wireless Sensor Networks: Applications and Forms 1 Wireless Sensor Network In this chapter, wireless sensor network (WSN) principles are being shortly introduced and discussed. In order to increase the level of understanding for analyzing Wireless Sensor Network (WSN) systems it is useful to study the technology behind them the technologies which are presented in this section. Wireless Sensor Networks (WSNs) are distributed and independent sensors that are connected and worked together to measure quantities such as temperature, humidity, pressure, noise levels or vibrations [5]. WSNs can measure vehicular movement (velocity, location, etc.) and monitor conditions such as lightning condition, soil makeup and motion [5]. Nowadays, WSNs are utilized in many common applications such as vehicle applications. Some of vehicle applications are: vehicle tracking and detection, tire pressure monitoring, vehicle speed detection, vehicle direction indicator, traffic control, reversing aid sensors etc. Such applications can be divided in major categories such as safety, security, environment and logistics. To implement WSN in an application and have an efficient system, first we need to consider about WSN technology, components and communication topology and protocols. Therefore, first, in this chapter, basic information about WSN components, the communication devices and process unit of WSN will be described. Then, the chapter will be followed by a description of the WSN topologies and protocols emphasizing on mesh WSN technology with ZigBee Protocol. 1.1 Wireless Sensor Network component To provide comprehensive view of WSN hardware, understanding of WSN components structure is required. Wireless sensors are small microcontrollers equipped with wireless communication device and an energy supplier. The architecture of WSNs is illustrated in Figure 3à ¢Ã¢â€š ¬Ã¢â‚¬Ëœ1 . As Figure 3à ¢Ã¢â€š ¬Ã¢â‚¬Ëœ1 shows the components of WSNs are sensing unit, processing unit, power supplier and communication device. The sensing unit consists of sensors and Analog to Digital Converters (ADCs). ADCs are responsible for gathering the signals and converting them into digital signals data and transfer them through each other using network topology to the processor unit. In the sensing unit, each sensor is called an ‘end node and varies in size and cost. The mission of these multifunction sensor nodes are to sense, process data and collaborate with other nodes [8]. Wireless sensor network can be positioned in two ways, either using a complex technique with the large sensors far from the object or using several sensors with an engineered design on position and topology [5]. In addition, each node provided with a wireless communication transceiver as a communication component. In the process unit, the controller and small memory storage are responsible for managing the collaboration within the sensors to achieve the assigning task. In addition, the communication device with a transceiver makes the network connection. Above all, the essential component of WSN is the power unit, which supports the power for all units [5]. One of the unique characteristics of sensor networks is that they are equipped with an on-board processor. This feature enables them to locally process some simple computations and broadcast only necessary processed data [5]. Network communication is really complicated and needs years of study [8], but to be able to implement WSN, we need to know some basic primary concepts of communication technology such as; network topologies, network protocol and their standards and specifications. 1.2 Communication technology To cover technical aspects of WSN, network topology and network protocol studying is needed. This study will help to provide information about reliability, robustness, security and stability and of WSNs software aspect to answer the research questions RQ. 1 ,RQ. 2 and RQ. 3 . 1.2.1 Topologies in WSN Communication In network communication, the big issue is how data transfers through nodes and nodes interconnect with each other. Several basic network topologies may be used for transmitting to and receiving from a node. The Alliance for Telecommunications Industry Solutions (ATIS) the standards organization of telecommunication industry explained the network topology as â€Å"The physical, real, logical or virtual arrangement of the nods/elements of a network† [9]. The topology shows the diameter and the number of nodes between any two nodes. Moreover how a data process and the data routing complexities are relied on the chosen topology. Consequently, some characteristics of a sensor networks such as latency, robustness and capacity are changed by their topology [10]. Figure 3à ¢Ã¢â€š ¬Ã¢â‚¬Ëœ2 is a graphic mapping of networks topology which shows the links of one or more nodes and explains the physical topology of the network. Despite having the same topology, two networks can differ in transmission rates because of their physical interaction, signal types and distance between nodes [9]. Table 3à ¢Ã¢â€š ¬Ã¢â‚¬Ëœ1 describes the different types of network topology. Table 3à ¢Ã¢â€š ¬Ã¢â‚¬Ëœ1 Topology TYPES [9]. Since Mesh topology is a main topic in the thesis, it is studied more in-depth in this section 1.2.1.1 Mesh Wireless Network Wireless mesh network is a term used when all wireless nodes are connected to each other within an ad-hoc multi-hob and mesh topology. In this network, any pair of nodes is able to communicate between each other within more than one path. In this network each node is used as a router to forward packets to the neighbor nodes which they have linked to. That means all nodes communicate directly or through other midway nodes without any manual configuration. Therefore, this network also called a self-configuration and self-organized network [11; 12]. As described in Table 3à ¢Ã¢â€š ¬Ã¢â‚¬Ëœ1, there are two types of mesh topology ‘Partially connected and ‘Fully connected (See Figure 3à ¢Ã¢â€š ¬Ã¢â‚¬Ëœ3). In a fully connected topology each node has the ability to communicate with all other nodes in the network and creates an interconnection links. By increasing the number of nodes in a mesh network, the number of links increases as well. On the other hand, in a partially connected topology, instead of direct interconnection between nodes, each node has two or more links to others to provide alternate routing and traffic balancing. Due to more links and indirect connections between nodes, traffic can flow through one or more router nodes to the destination [7] and create more reliable interconnections between nodes. Moreover, in partial network, the nodes are connected to either the node with higher rate of data transaction or the nearest neighbor node while in fully connected network all nodes have a direct links with each other. This multiple link path conducts a reliable communication. Therefore, whenever a connection fails or a node breaks down, the packages can automatically change their path by ‘jumping from a disconnected node. This is often called the self-healing of the network. This means that the networks connection stability and reliability are not essentially affected by node failures [11]. Due to the characteristics of wireless sensor network mesh, this network is self-configuring and self-organizing network in which each end-node is also used as a router (dual role- data originator /data router) to forward the signal packages all the way back of the main gateway. Therefore, due to the characteristics of mesh networks, this network is becoming one of the most implemented networks which able to have the flexible architecture for the network, easy self-configuration and robust fault tolerance connectivity [11; 12]. Additionally, the self-configuring characteristic of mesh WSN, bring the ability for the network to connect or disconnect nodes from the network. This brings the ability to grow/decrease the network by adding/removing nodes of a system. Mesh WSN has reliable self-healing and robust fault tolerance. This means if ­Ã‚ ­Ã‚ ­Ã‚ ­Ã‚ ­Ã‚ ­ a node fails or breaks down the signal packages jump from the disconnected node and automatically conducts a new path through the nearest node. However, the new path imposes re-routing and re-organizing to the network [5], which consumes too much power from the system. Therefore, having a power-aware protocol and algorithm is necessary for mesh network. ZigBee protocol is one of the protocols which provides this ability for WSN. 1.2.2 Protocols in WSN Communication WSN systems include variety of protocols for communication. Protocols need to program in different architectural layers. One of these architectural standard is OSI (Open System Interconnection) framework. In this session a brief introduction of each protocol and OSI are delineated. Figure 3à ¢Ã¢â€š ¬Ã¢â‚¬Ëœ4 shows the graphic overview of all wireless network technologies. This figure illustrated IEEE PAN/LAN/MAN technologies and clearly shows how these standards and protocols can be used in different conditions. For instance, 3G protocol is used to cover a long range of audio information in a wide area network (WAN) while for the same information in a short range and personal area network (PAN), Bluetooth is better. The standard conceptual rules set for data representation, data communication and error detection across two ends in telecommunication, are called communication protocols. These abstract rules represent in different layers of communication. There are different protocol stacks introducing different architectures for these layers such as AppleTalk, Distributed Systems Architecture (DSA), Internet protocol suite (TCP/IP) and Open Systems Interconnect (ISO/OSI). Figure 3à ¢Ã¢â€š ¬Ã¢â‚¬Ëœ5 (a) illustrates the different layers of an OSI Model and their functionalities. The OSI model has seven layers and each layer provides services for the upper layer and requests services from the lower layer. Figure 3à ¢Ã¢â€š ¬Ã¢â‚¬Ëœ5 (b) shows the typical communication protocols layers. Each of these layers has to deal with different issues regarding the communication procedure. As the typical protocol stack model shows in Figure 3à ¢Ã¢â€š ¬Ã¢â‚¬Ëœ5 the communication protocols should implement all layers from bottom to top. In addition, a management protocol needs to be applied in each layer to manage power efficiency, robust connectivity and connection reliability (see: Figure 3à ¢Ã¢â€š ¬Ã¢â‚¬Ëœ5 b). Below, rules and functionality for each layer are described: * Physical layer: is responsible for signal processing and physical interface connectivity between a device and physical medium and used bit stream in its data unit. It acted as communication channel for sensing and actuation in cost-efficient and reliable manner. Some examples of this layer are: IEEE 802.11b/g Wi-Fi, IEEE 802.15.1 Bluetooth, IEEE 802.15.4 ZigBee, etc. [7] * Data link layer: provides functionality toward channel sharing, Medium Access Control (MAC-Layer), timing (e.g. data time arrival), local link and capacity. It is responsible for detecting and correcting the data errors in physical layer and control the locality data comparison. It follows the protocols such as point-to-point protocol (PPP) and IEEE 802 Local Link Control (LLC). [7] * Network layer: is responsible for network routing functionality, network security, energy and power efficiency and reliability of the communication. It includes the network topology management and manages the information and detects errors in data transfer from router to router. A number of protocols is address in this layer such as: Internet protocol (IP), Threshold Sensitive Energy Efficient Sensor Network Protocol and etc. [7]. * Transport layer: provides end-to-end transportation (distributing and gathering) of data between end users. It includes storage and responds for caching and controlling the data to recover them back to the initial message that has been sent. Best-known protocols for this layer are Transmission Control Protocol (TCP) and User Datagram Protocol (UDP) [7]. * Upper layers: The Upper Layers are responsible for application processing, external query processing and etc. Upper layers include presentation layer session layer and application layer [7]. The summary of these standards and protocols are shown in Figure 3à ¢Ã¢â€š ¬Ã¢â‚¬Ëœ6 Among all the standard and protocols, IEEE PAN/LAN/MAN technologies are the ones applied in the majority of commercialWSNs to support physical layer and link-data layer signal transmission. As SOHRABY and ZNATI (2007) mentioned, the most common best-known protocols are:† (1) the IEEE 802.15.1 (also known as Bluetooth); (2) the IEEE 802.11a/b/g/n series of wireless LANs; (3) the IEEE 802.15.4 (ZigBee); (4) the MAN-scope IEEE 802.16 (also known as WiMax); and (5) radio-frequency identification (RFID) tagging† [7]. Each of these protocols has their own benefits and constraints. The comparisons between IEEE technologies are mentioned in Table 3à ¢Ã¢â€š ¬Ã¢â‚¬Ëœ2. As Table 3à ¢Ã¢â€š ¬Ã¢â‚¬Ëœ2 shows the IEEE 802.15.4 standard provides data rate of 20 to 250 kbps and operates in the 2.4-GHz ISM band. This standard covers signals in range of 10 m and requires the lowest power among other IEEE class. While IEEE 802.11a/b/g/n transmits the data in the rate of 54 Mbps ideal for wi reless internet connections and operates in the 2.4-GHz ISM (Industrial, Scientific and Medical) radio band as well as the 5-GHz ISM / 5-GHz U-NII (Unlicensed National Information Infrastructure) radio band. However, it requires much higher power consumption than IEEE 802.15 [7]. Recently, researchers put much effort to develop â€Å"a cost-effective standards-based wireless networking solution that supports low-to medium data rates, has low power consumption, and guarantees security and reliability† [7]. ZigBee Alliance is an association of companies which aims to provide such a standard for WSN consumers. Their mission is to have a simple, reliable, low-cost, low-power and standards-based wireless platform 1.2.2.1 ZigBee standard The ZigBee standard builds on IEEE 802.15.4 and is suitable for remote monitoring and controlling applications. Although it has lower-data-rates than the other standards, its reliability, security, long life battery with less complexity mechanism make it ideal for building automation in industrial network applications. The architecture of the ZigBee stack is established on the Open System Interconnection (OSI) model. The IEEE 802.15.4 defines the physical layer (PHY) and medium access control (MAC) sub-layer and In addition, ZigBee Alliance defines other functionalities for upper layers [7]. Figure 3à ¢Ã¢â€š ¬Ã¢â‚¬Ëœ7 is a graphic overview of ZigBee protocol stack and shows the responsibility areas of IEEE 802.15.4, ZigBee Alliance platform and users applications [7]. This picture also shows the basic functionality of each layer. The data transmission service is provided by PHY layer and the protocol in this layer enables the connection between data units and the physical radio channel. ZigBee provides three different frequency band options for PHY layer. First, the transmission data-rate of 250kbps in 16 channels at 2.45GHz (Global) frequency. Second, with 40Kbps in 10 channels at 915MHz (Americas). And the last one, with 20kbps in 1 channel at 868MHz (Europe). The higher data-rate causes a higher order in modulation design and the lower frequency cause a larger cover area and better sensitivity. Depending on the power output, the transmission distance rate can change from 1 to 100 meters. (For more detail information see: Table 7à ¢Ã¢â€š ¬Ã¢â‚¬Ëœ1 in Appendix A) ZigBee WSN has the ability to have static or dynamic network/component with either star or mesh topology and it has three types of nodes: a ZigBee Coordinator (ZC), ZigBee Routers (ZR), and ZigBee End-Devices (ZED). In order to have a communication protocol and physical connection both PHY layer and MAC sub-layers of the architecture should be defined upon agreement between server and clients. These layers require manual administrative procedures setting for server/client gateway. The next three levels namely: the network layer, security protocol and transport layer are defined by ZigBee alliance platform automatically. The last layer, application layer, has to interact with the user-interface and other applications; it ought to be programmed with high-level language so that integration with any existing devices applications becomes more conveniently practical. The ZigBee stack in gateway is responsible for all the network functionality such as network process management, authentication of the joined nodes, binding nodes and routing the messages throughout the network. ZigBee stack as a standard protocol, has clusters and libraries for improving the implementation process, therefore, using ZigBee compare to other protocols makes the system (including both hardware and software) development process much faster and easier. On the other hand, such standardisation provides easiness of adopt with third party sensors regardless of manufacturer, which might be attached to the network later. 2 Software Aspects To address the research question regarding the reliability, robustness, and security of any WSN application, it is essential to investigate the software architecture of that network. For convenience in description of the architecture of a WSN application, it is divided into three segments: Physical devices (such as lamps, sensors, nodes), Communication Protocol (terminals and servers, bridge, switch, network topology and standard) and Carried Information (application, functions, etc.). Any attempts to retain a precise design on software architecture for each part will cause an effective data transmission, which ensures reliability and security of the system [7]. Hence achieving any desired data transmission precision level in a WSN, network management (NM) techniques are applicable. Such techniques assist in network status monitoring, reliability and security amendment, and cooperation supervision between components [7]. NM techniques could also detect and resolve network faults in addition to restoring the system respectively [7]. In practice, designing WSN application necessitates tailoring NM techniques for each architectural segment. Various NM techniques regarding each segment are summarized as follows [7; 12; 5]: a) Physical architecture: Sensing and processing management, operation and administration, fault tolerance, maintenance, energy efficiency management, configuration management, performance management, security management, network element management. b) Communication architecture: Network management, networking protocols, network topology, function management, monitoring functions, fault management, performance management, security management, service management and communication, maintenance management, network configuration and organization, network behavior, data delivery model, sensor mobility, naming and localization, sensing coverage area, communication coverage area energy efficiency management c) Information architecture: Real-time information management, mapping management, service management, analyze information, control application, business application management report management, sending and receiving commands or response, naming, localization, maintenance, fault tolerance Aforementioned NM techniques enhance quality of the system. According to ISO 9126-1 software quality model Table 4à ¢Ã¢â€š ¬Ã¢â‚¬Ëœ1 [13; 14; 15], the quality characteristics of a system could be divided into six fundamental properties: functionality, reliability, usability, efficiency, maintainability, and portability. According to the same documentation, these characteristics are broken to sub-characteristics such as suitability, security, maturity, fault tolerance, adaptability, analyzability, stability, testability and so on [13]. However, focusing on all subcategories collectively exceeds the time horizon of this research, from this stance three dimensions namely reliability, robustness and security are brought into attention. This section will be divided to two subsections describing the architecture issues and NM techniques for (1) Reliability and Robustness, (2) Security, of WSN and other characteristics is relegated to future studies. 2.1 Reliability and Robustness In WSNs context, the probability that a network functions properly and aggregates trustworthy data without any interruption continuously, is usually referred to as reliability characteristic of the network [23; 20]. According to ISO 9126-1 software quality documentation, reliability characteristic shows the capability of a network to maintain or re-built (re-start) the service in certain period of time [13]. So, it is important that during long sensing, the network has to service up continuously. Reliable service of a network includes precise and proper sensing, delivering and sending acceptable data to the base station. In other words as Taherkordi et al. (2006) put: â€Å"The less loss of interested data, leads us to higher reliability of a system†. Systematic approach perceives reliability as probability of data delivery to the base station rather than point-to-point reliability [16]. Robustness defined by Sohraby et al. (2007) as: â€Å"a combination of reliability, availability, and dependability requirements†, reflects the degree of the protocol insensitivity to errors and misinformation†. Achieving system robustness in WSN, necessitates system capability to detect, tolerate and confine errors as well as reconfigure and restart the network respectively [7]. According to the given definition by Sohraby et al. (2007), it is apprehensible that reliability and robustness share commonalities with each other; this is the main rational behind discussing these two attributes together in this section [7]. Considering the nature of communication in WSN, a network is unpredictable and prone to fail caused by any physical damages in hardware devices, energy depletion, communication link error, information collapses in packages and etc. [17; 16]. Therefore, one of the critical issues in design phase of WSN is applying fault tolerance techniques to optimize the network so that reliability and robustness attained [17]. These techniques enable the network to withstand and recover any upcoming failure and restart operation [13]. Liu et al. (2009) categorized fault tolerance techniques into: node placement, topology control, target and event detection, data gathering and aggregation, and sensor surveillance. Reminding from the beginning of this chapter architecture design divided into three segments. Table 4à ¢Ã¢â€š ¬Ã¢â‚¬Ëœ2 depicted a summary of the plausible related faults and their solutions in each segment. In the following, each aforementioned fault tolerance techniques are being discussed in each design segment. Table 4à ¢Ã¢â€š ¬Ã¢â‚¬Ëœ2 The most probable fault and their fault tolerance solutions in WSN [17; 7; 18] 2.1.1 Reliability and Robustness of Physical Architecture: Fault: any physical interruption in sensor surveillance Solution: Node placement management and signal-effect management First item that should be considered in designing physical components architecture for reliability and Robustness is: physical placement and signal-effect management. As it is mentioned in section 3, although the mesh network communication is self-organize topology and does not need any manual configuration to bind the network for mobile sensors, the physical architecture and the location schema of the hardware components, sensors and gateways need to be designed carefully [7]. As a characteristic of mesh WSN, the sensors in network are free of any installation restrictions, even though, the placement should be far from any physical destruction or hostile locations. Inappropriate physical placement of sensor transmitters and gateway antenna can cause noise or significant lost in signals [7]. In addition, the signal coverage is decayed by surrounding objects and materials such as metal wall and the like. (E.g. exterior wooden, concrete, brick or gypsum frame, block or wall). Especially in the case of vehicles, the main body can impose such problem and henceforth installation of the sensors in this manner would be delicate. Moreover, the signal waves might be faded and affected during the transmission, due to various physical phenomena such as reflection, diffraction or scattering [7]. These effects would cause significant interruption in sensor surveillance. Therefore, it is important to manage these signal-effects in early stage of WSN physical architecture design. Reflection occurs when electromagnetic wave of signals is duplicated due to impinge of the wave on large object or surface such as walls, buildings and the Earth [7]. Therefore, all the reflection of the walls and also the Earth should be acknowledged in physical architecture design. Diffraction refers to any defection and obstruction in waves caused by irregular sharp edges during the data transmission between the transmitter and receiver [7]. In this case, designers have to be prudent in sensors placements in the proximity of sharp edges and corner angels. Scattering refers to any deviation from straight line. Environmental obstacles in the propagation path affect passing waves from their original structure. Even small irregular object such as street signs, and lampposts might encounter and scatter the wave. Hence WSN should be design to face with any irregular scattering during the wave transmission. Above all, the mobility of sensors and surrounding objects might fade the signals and add noises that should be considered in architecture design [7]. These issues are the basic physical factors, which cause major fault in data aggregation of WSN and cut down reliability and robustness. These destructive signals need to be subtracted from the received signal paths [7] before sending the data to gateway. Therefore, reflection, diffraction and scattering should be considered not only by designers in the physical components placements, but also by programmers in network development. Fault: Sensors failure Solution: Hardware replacement The next issue that needs to be considered in designing the physical architecture of a WSN is hardware failure. Sensors energy suppliers or any damages to the sensors and/or their transmitters are the sources of hardware failure. Regardless of source of failure, the WSN must be capable of functioning as well as replacing and switching sensors when necessary. Additionally, any changes in the physical components, on one hand, needs an explicit and well-defied consideration on security issue to prevent any potential threats, and on the other hand, needs an adaptable and configurable communication connection network [18]. 2.1.2 Reliability and Robustness of Communication Architecture Fault: communication link errors Solution:Topology control and event detection , Replicated services in communication model, Communication link error is an important concern in dealing with reliability and robustness of a network in communication architecture. The sensors in WSN are prone to fail and make link errors in point-to-point reliability of communication protocol. Therefore, it is the network topology responsibility to detect the errors and guarantee the overall reliability of the syste

Langston Hughes Salvation Essay example -- Langston Hughes Religion E

Langston Hughes' Salvation In most people's lives, there comes a point in time where their perception changes abruptly; a single moment in their life when they come to a sudden realization. In Langston Hughes' 'Salvation', contrary to all expectations, a young Hughes is not saved by Jesus, but is saved from his own innocence. 'Salvation' is the story of a young boy who has an experience of revelation. While attending a church revival, he comes to the sudden realization that Jesus will not physically come save him. In the first three sentences of the essay, the speaker adopts a very childlike style. He makes use of simple words and keeps the sentences short, similar in style to that of an early aged teenager. But since the text is written in the past tense and the narrator mentions that he was 'going on thirteen' (181), we know the speaker is now older. After reading a little further, we find that the style becomes more complex, with a more select choice of words and longer sentences. The contrast between simple and complex styles is present all through the rest of the essay, and creates a more personal atmosphere. Another particularity of 'Salvation' is the fact that the story recounts Langston Hughes' own personal experiences as a young boy. This high degree of intimacy allows Hughes to supply the reader with some very concrete details and vivid descriptions. The beauty in Hughes? personal insights lies in their power to reach our senses. We can clearly picture th...

Allys Wisdom :: College Admissions Essays

Ally's Wisdom I have baby-sat Ally, a little girl who has mild autism, for the past several years. She used to only speak a few words and sit still only five minutes at a time. Now she is a child who can talk up a storm and sit with me for hours while we enjoy a video. She is cute, funny, bright, and very caring. Like the rest of us, Ally has her ups and downs. There are moments when she is confident and moments when she is feeling a bit confused. She can be serious or delightfully silly. One thing that distinguishes Ally is the tendency to think in very concrete terms. When she was young, we often played the "What is it?" game. I choose an object; she identified it. The light switch was "light on-off," and the doorknob was "door open-close." At first I thought, "That's not what it's called." Then I realized how arbitrary our conventional labels are. Ally identified things for their purpose and function. Even now when I talk to her on the phone and ask, "What are you doing?", she answers "I'm talking to you." I have realized that if I wanted to know what she was doing before she came to the phone, that's what I should have asked. Sometimes we think we are communicating clearly, when what we say can actually be confusing for others. Ally helped me the most when my grandmother died. She knew that I was upset because she could see that I had been crying. When she asked me what was the matter, I told her I was sad because I missed my grandmother. She looked at me and said, "Why don't you try smiling?" At first I thought that her suggestion was foolish, but I have realized the

RAWWW scotti monk Essay

â€Å"Raw†, composed by Scott Monk, Brett a young offender is sent to a detention centre to reform and attain a second chance in life. However, through the use of Brett’s derogatory colloquialism, such as ‘pigs’ in reference to the police, it’s made clear that Brett is resistant to the law. As a result Brett is sent to The Farm, a facility that aims to turn young offender’s lives around, by reforming them. The Farm works on the principals of care, trust and responsibility. There are no fences or guards, just the boys and parent figures Sam and Mary. There are no cells, rather bedrooms. As well as offering rehabilitation, The Farm also supplies educational facilities, as it aims to give young offenders a second chance in life, and excursions to reward the boys for their good behaviour, a justification of the trust placed on the boys. The use of contrast between characters effectively portrays the ideas of protest, compliance and reform. In contrast to Brett who constantly protests against the rules through smoking, stealing from other inmates, running away and showing an arrogant attitude towards The Farm, Josh chooses to comply. ‘Sam doesn’t order me to do anything. He is my friend. I live on the farm, I do what he says’. The use of dialogue shows Josh’s feelings towards The Farm, it’s a home to him, as it offers the structure and security that he couldn’t obtain outside The Farm, conveying institutions benefit those who wish to reform so they comply whilst others protest. However the effect of the institutions goes beyond the individual. The institution forces society to stereotype those who reside in them, depriving individuality and is supported through Mr Douglas in Raw, ‘it may have a fancy name, but it is still a jail for criminals,’ and Toby, in Girl Interrupted, ‘them’, ‘they’re eating grapes off the wallpaper’. The structure of The Farm is based around care and responsibility. Brett conforms to these ideas to avoid being sent back to Sydney. However, Sam, Frog and Josh all find something to like about Brett and save him numerous times from being sent back to Sydney, for example when he ran away from The Farm. Brett tries to return the favour by dropping his attitude and in turn grows, learning to accept responsibility and show compassion for others. Brett’s change in character is most evident when he attempts to avoid fighting Smiling Joe ‘I don’t want to get into a fight. Just let me take the kid’. Brett grows here, as he tries to avoid fighting Smiling Joe at all costs to avoid putting Frogs safety at risk. Brett only uses violence as a last option, compared to the beginning of the text where violence was the only course of action to solve problems that arose. Brett resorts back to protest after a fall out with Caitlyn, a girl he falls in love with, which results in Brett being sent back Sydney. This enforces what Sam repeatedly says to Brett throughout the text, ‘only you can change your life’ This shows that the institution is only limited by the individual’s compliance and willingness to reform. Brett’s change in attitude is signified through the symbolism of the storm. The storm depicts the washing away of Brett’s past and the beginning of a fresh future. The sun resembles a bright future showing how the institution gives Brett a second chance in life and his change in attitude towards life. Susana Kaysen, in Girl Interrupted, directed by James Mangold, sleeps with a married doctor, which she regrets and resorts to consuming a bottle of aspirin and vodka. As a result Susana’s parents believe she needs ‘rest’ and force her to admit herself to Claymoore, an upscale psychiatric institution that allows rest and rehabilitation. Claymore operates around a rewards system. The more a patients complies and rehabilitates, the more privileges that patient receives, such as ground privileges. Susana’s instability and disorientation of her condition is revealed through the use of constant jump cuts, jumping from past to present, as well as the use of an unstable camera, close-ups and the high angle shot of Susana in the hospital bed in the opening scenes of the movie. Susana, similarly to Brett, protests at first. For example when the girls escape into the basement to play bowling, sneak into the doctor’s office to read out reasons for their confinement and Susana escaping from Claymore with Lisa, showing Susana’s protest and her denial of her condition. After seeing Daisy dead in her own home, Susana returns to the institution. The use of the road in the mid-shot symbolises Susana’s journey from denial to realisation, which ends her protest. On return to Claymore, Susana complies with the rules and receives the emotional and psychiatric support that she knew she needed, like Brett in ‘Raw’. After much improvement Susana is released, showing that the institution is only limited by the individual’s compliance and willingness to reform. In contrast to ‘Raw’ and ‘Girl Interrupted’ the song â€Å"Prisoner of Society† sung by The Living End refers to a younger generation crying out for freedom. The opening line of the song portrays that the younger generation doesn’t wish to abide by the rules and regulations society has set. Well we don’t need no one to tell us what to do The first person view allows sympathy to be directed to the younger generation. This and the use of incorrect grammer, so common to rebellious teenagers, helps portray the message of the song, which is that today’s youth are prisoners of the older generations society, which alienate the younger generation and instead of looking for support and comfort, they thrive to rebel against these rules and law enforcement bodies, with the institution of society having no effect on the younger generation as they don’t comply and don’t want to reform. This creates the younger generations culture, arguing they are their own society. Well we don’t need no one The repetition of this phrase shows a generalisation that the younger generation holds towards authority, indicating a preconception towards authoritative figures. The final lines of the song links back to the title and meaning of the song. You’ll see I’m not the enemy Just a prisoner of society These lines convey to that the younger generation feels confined and trapped by society. Society has an expectation the younger generation will either follow the laws that are set down or protest against these laws. If protest is chosen, society will punish the rebels. As you can see, this text has many parallels to Brett in Scott Monks, â€Å"Raw†. Brett also wishes to be free to do as he pleases, however, Sam has set rules, which must be followed. The derogatory colloquialism such as ‘old goat’ in reference to Sam shows the same generation gap the song talks about. This reinforces the argument made about Raw and Girl Interrupted that the institutions affect on the individual is limited by the individual’s compliance and willingness to conform.