University Degree No Guarantee of Employment Essay Example for Free

University Degree No Guarantee of Employment Essay KUALA LUMPUR, Oct 24 (Bernama) Fazren, 29, has a degree in transport management but has been working as an administrative assistant at a government agency over the past four years. I have applied for many jobs, both in the civil and private sectors. When I was offered the post of an administrative assistant (at a government agency) I did not hesitate to accept even though the post is for those with SPM qualification. Getting a job is quite difficult these days, the Pahang-born clerk told this writer here. Amran obtained 7As in the 2009 Sijil Pelajaran Malaysia (SPM) examination and is now working as a nurse in a government hospital after obtaining a diploma in nursing from a government nursing college this year. When queried on why he opted for a nursing course despite having good SPM results and the opportunity to study in a university, the 22-year-old Perlis-born Amran replied, It is for economic reasons. I opted not to go to university as I believe getting a job will be difficult even after I graduated with a university degree. But with a nursing diploma, a job will be waiting for me at any government hospital or other private hospitals. It is better to start working at a young age rather than waiting for many years in order to get a job, he said. Both Amran and Fazren (not their real names) are among many Malaysian job seekers who are not particular over the choice of employment as they believe that holding a university qualification does not guarantee them a salaried job. Unemployed graduates Last May, the Deputy Human Resource Minister Datuk Maznah Mazlan told Parliament that some 76,200 graduates in the country were unemployed. She said that the Human Resource Ministry was trying to resolve the growing rate of unemployment in the country. In 2010, the number of unemployed graduates was 42,955 or 24. 62 per cent of 174,439 Malaysian graduates. There are 20 public universities (IPTA) in Malaysia including Universiti Malaya (UM), Universiti Kebangsaan Malaysia (UKM), Universiti Sains Malaysia (USM) and Universiti Teknologi Mara (UiTM). The country also has 60 private higher education institutions (IPTS) like Universiti Teknologi Petronass (UTP), Universiti Multi Media (MMU) and Universiti Tenaga Nasional (Uniten). Bachelors degree According to the Higher Education Ministry, universities, university colleges and polytechnics nationwide produced 184,581 graduates last year and 44,391 or 24 per cent of them were unemployed. Based on statistics, Arts and Social Sciences graduates have the highest number of unemployment numbers, constituting 44. 5 per cent or 19,784 from the total number of unemployed graduates. Next were graduates from technical fields where 12,321 were employed, constituting 27. 7 per cent of the total number of unemployed graduates. Science graduates came in third with 7,321 which accounted for 16. 49 per cent of the total number of unemployed graduates. The ministry said that a total of 21,248 bachelors degree holders were still unemployed whereas diploma holders have the lowest unemployment rate at 3 per cent. According to industry sources, many graduates are still unemployed because the courses they studied at university do not have a wide market. Poor communication skills Human science lecturer Amien Iskandar said that one of the reasons why graduates could not secure jobs was that their qualifications do not meet market demands and requirements, thus rendering them not marketable. Another factor is the bad command of English. A good command of the English language could help graduates secure employment, especially in the private sector. To this end, there is a need to ensure that these graduates are equipped with the necessary skills so that they could be hired for employment after graduating, he said. Amien also cited poor communication skills, wrong work attitude and unrealistic expectations as other barriers in gaining employment. If you have a good command of English but cannot communicate with others due to poor attitude, (then) you may also find difficulties in being employed, he explained. Lack of technical training According to the Federation of Malaysian Manufacturers (FMM), the lack of industrial training is also among the factors why graduates are unemployed. Meanwhile, the Higher Education Ministry Student Development and Affairs Director, Prof Dr Mohd Fauzi Ramlan was reported by the media as saying that other factors that compounded the issue are low problem-solving skills, tendency to switch jobs or job-hopping and lack of self-confidence. He called on graduates to improve their command of the English language to boost their communication skills. (Can they expect to be employed) if they fail to convince their prospective employers on their potential, (then) their chances of getting hired are very slim, he was reported as saying. Mohd Fauzi also advised graduates to drop the negative attitude of preferring to gain jobs in their home towns. http://www. mysinchew. com/node/79072.

Rowhammer and Microarchitectural Attacks

Rowhammer and Microarchitectural Attacks Problem 1: Hardware Oriented Security and Trust Problem 2: Wireless Networking Problem 1 Introduction The analyzed paper deals with Side-Channel attacks on mobile devices, providing a thorough categorization based on several factors. Side-channel attacks aims to extract sensitive information taking advantage of apparently harmless information leakage of computing devices, both from the SW and HW point of view. Side-channel attacks are initially categorized as active or passive, depending on the level of influence and involvement the attack has on the system. The concept of Software and Hardware attacks are identified to separate attacks that exploit, respectively, logical and physical properties of a device. Also the distance of an attacker is a relevant element in the analysis of Side-channel attacks. The authors distinguish among Local, Vicinity and Remote Side Channel Attacks, depending on how close is the attacker to the attacked device. A comprehensive list of examples for every type of attacks is given, along with a constructive discussion on possible countermeasures. In this report, we will focus on the Rowhammer and Microarchitectural attacks that will be discussed in the following paragraphs. a) Rowhammer Attack As miniaturization of hardware architectures is pushed more and more, the density of memory cells of the DRAM drives the size of these cells to a dramatic reduction in dimensions. For the intrinsic properties of DRAMs, this leads to a decreases in the charge of single cells and could cause electromagnetic coupling effects between cells. Rowhammer attack takes advantage of this Hardware vulnerability. a.i) Principle The Rowhammer glitch takes place in a densely-populated cell hardware environment allowing an attacker to modify memory cells without directly accessing it. The aforementioned vulnerability in DRAM cells can be exploited by repeatedly accessing a certain physical memory location until a bit flips in an adjacent cell. A well-orchestrated Rowhammer attack could have devastating power, even getting to have root privileges. Rowhammer base its strength on a principle called Flip Feng Shui [2] where the attacker abuses the physical memory allocator to strike precise hardware locations and cause bits to flip in attacker-chosen sensitive data. Rowhammer can be either probabilistic [3] or deterministic [4]. The latter shows a greater impact as the lack of control of the first one could corrupt unintended data. The most effective Rowhammer attack is the double-sided Rowhammer [5], capable of having more flips in less time than other approaches. a.ii) Architecture The objective of Rowhammer attack is the DRAM. DRAM usually stores electric charges in an array of cells, typically implemented through a capacitor and an access transistor. Cells are then organized in rows. Thus memory cells inherently have a limited retention time and they have to be refreshed regularly in order to keep their data. From an OS point of view, a page frame is the smallest fixed-length adjacent block of physical memory that maps an OS memory page. From a DRAM point of view, a page frame is just a contiguous collection of memory cells with a fixed page size (usually 4KB). With this in mind, triggering bit flips through Rowhammer is basically a race against the DRAM internal memory refresh scheme to have enough memory accesses and cause sufficient disturbance to adjacent rows. a.iii) Instruction Set Architecture The Instruction Set Architecture (ISA) is a functional specification of a processor programming interface. It is used to abstract over microarchitecture implementation details (e.g. pipelines, issue slots and caches) that are functionally irrelevant to a programmer. Even though it is practically transparent, the microarchitecture incorporates a hidden state, which can be observed in several ways. To test whether Rowhammer can be exploited, a precise knowledge of memory cells dimension is crucial. In mobile devices, ARM processor represents the most widespread and used microprocessor. In [4] the authors determine the minimum memory access time that still results in bit flips by hammering 5MB of physical memory while increasing the time between two read operations by means of inserting NOP instructions. The rows are all initialized to a certain value, therefore all the changes are due to Rowhammer. Results show that up to 150 bit flips happen per minutes with around 150 ns read time. a.iv) Procedure The Rowhammer attack procedure is a combination of three main system primitives: P1. Fast Uncached Memory Access: Enable attackers to activate alternating rows in each bank fast enough to trigger the Rowhammer bug; P2. Physical Memory Massaging: The attacker tricks the victim component into storing security-sensitive data (e.g., a page table) in an attacker-chosen, vulnerable physical memory page. P3. Physical Memory Addressing: To perform double-sided Rowhammer, an attacker needs to repeatedly access specific physical memory pages. Mobile devices have Direct Memory Access (DMA) mechanisms that facilitates the implementation of P1 and P3. In particular, Android devices run ION, a DMA that allows user unprivileged apps to access uncached physically contiguous memory. To enforce P2 the attacker tricks the physical memory allocator built in Linux (buddy allocator) so as to partition the memory in a predictable way. Accurately selecting the dimensions of memory chunks to allocate, memory cells can be exhausted through Phys Feng Shui. Once the position of Page Table Pages (PTPs) and Page Table Entries (PTEs) is indirectly known, double-sided Rowhammer is performed. Once the desired flip triggered, write access is gained to the page table by mapping into the attacker address space. Modifying one of the attacker PTPs, any page in physical memory can be accessed, including kernel memory. b) Microarchitectural attack  ­The evolution of hardware architecture lead to a wide use of cache memories. Having several levels of cache between a CPU and the main memory, helps optimizing the memory access time with respect to the clock frequency. Microarchitectural attacks take advantage of the timing behavior of caches (e.g. execution times, memory accesses) to read into sensitive information. In [6] a comprehensive survey that presents microarchitectural attacks is given. b.i) Principle Microarchitectural attacks are based on different cache exploitations. Among them, three main methods are identified: Prime + Probe: The attacker fills one or more sets of the cache with its own lines. Once the victim has executed, the attacker accesses its previously-loaded lines, to probe if any were evicted showing the victim have modified an address mapping the same set. Flush + Reload: Its the inverse of Prime+Probe where the attacker first flushes a shared line of interest. Once the victim has executed, the attacker then reloads the evicted line by touching it, measuring the time taken. A fast reload indicates that the victim touched this line (reloading it), while a slow reload indicates that it didnt. Evict + Time: The attacker first tricks the victim to run, through the preload of its working set, and establish a baseline execution time. In a second step the attacker then eliminates a line and runs the victim again. The difference in execution time indicates that the analyzed line was accessed. All microarchitectural attacks are a combination of those previously explained principles. Another noteworthy approach is causing Denial of Service (DoS) saturating the lower-level cache bus [7]. .b.ii) Architecture As mentioned before, microarchitectural attacks objective is the cache. Caches are organized into lines. A cache line holds a block of adjacent bytes that are taken from memory. Cache are further organized in levels. Each level has a different size and is carefully selected to balance service time to the next highest (smaller in dimension therefore faster) level. Caches can enforce either Virtual or Physical addressing. In Virtual addressing, L1 cache level stores the index of virtual-to-physical addresses. .b.iii) Instruction Set Architecture The inference process of the internal state of the cache is a key parameter to perform devastating microarchitectural attacks. Analyzing the ISA of a cache can provide an attacker with useful information about the hardware structure. Several different states can be exploited and are briefly summarized here: Thread-shared State: cache stores information that are shared between threads. Accessing them could lead to performance degradation of the involved threads. Core-shared state: Analyzing L1 and L2 cache contention usage between competing threads, it is possible to infer the encryption keys for algorithm used in internal communication (e.g. RSA, AES). Package-shared State: Running a program concurrently in different cores residing in the same package, could lead to the saturation of that packages last-level cache (LLC). The saturation affects all the lower levels, exposing sensitive data. Numa-shared State: Memory controllers memory in multi-core systems are exploited to enforce DoS attacks. .b.iv) Procedure A plethora of attacks are presented in [6], therefore the procedure of the Flush + Reload for Android systems using ARM processors [8] is discussed. The most powerful methods to perform Flush + Reload is to use the Linux System Call clflush. However it is provided by the OS on x86 systems, on mobile devices using ARM this function is not available. A less powerful version of it is clearcache and is used in [8]. When the attack starts, the service component inside the attacker app creates a new thread, which calls into its native component to conduct Flush-Reload operations in the background: Flush: The attacker invokes clearcache to flush a function in the code section of this shared line. Flush-Reload interval: The attacker waits for a fixed time for the victim to execute the function. Reload: The attacker executes the function and measures the time of execution. With a small execution time, the function has been executed (from L2 cache) by some other apps (possibly the victims). In [8] the authors show that this method is capable of detecting hardware events (touchscreen interrupts, credit card scanning) and also tracing software executions paths. c) Rowhammer vs Microarchitectural attack Following the categorization used in [1], both Rowhammer and Microarchitectural attacks are active software attacks that exploits physical properties of the victim device. In particular Rowhammer uses the coupling effect of DRAM cells while Microarchitectural attacks gather sensitive information through the analysis of cache timing. The two attacks act at two different levels: while Rowhammer needs to work fast on an uncached DRAM, Microarchitectural attack objective are cache memories that are usually SRAM. Both of them can be applied to desktop and to mobile OS [4][8], as well as cloud environments. c) Mobile vs Desktop attacks Mobile devices are inherently more vulnerable than Desktop computers. Their portability and close integration with everyday life make them more available to attackers. Moreover, apps are way more easy to install on mobile devices and general carelessness helps hackers in installing malicious software. Also, with respect to desktop computers, mobile phones have several sensors that can be exploited to gather information about users behavior. But from a OS point of view, mobile OS are way more limited than Desktop OS. Specifically, Rowhammer suffers from the limited subset of features available in desktop environments (e.g. no support for huge pages, memory deduplication, MMU paravirtualization). Same limitations happens in Microarchitectural attacks for ARM , where clflush function to perform Flush + Reload is not supported. 2) NAND Mirroring NAND mirroring is categorized in [1] as an active local Side Channel attack that exploits physical properties out of a device chip. In particular, in [13] a NAND mirroring attack is performed on an iPhone 5c. The security of Apple iPhone 5c became an objective of study after FBI recovered such mobile device from a terrorist suspect in December 2015. As FBI was unable to retrieve data, NAND mirroring was suggested by Apple technology specialists as an optimal way to gain unlimited passcode attempts so as to bruteforce it. As the encryption key is not accessible from runtime code and its hardcoded in the CPU, it is impossible to brute-force the Passcode key without the getting at the hardware level. In iPhones such memory is a NAND flash memory. In NAND memories the cells are connected in series which reduces the cell size, but increases the number of faulty cells. For this reason, external error correction strategies are required. To help with that, NAND memory allocates additional sp ace for error correction data. In [13] the authors desoldered the NAND memory and mirrored it on a backup file. Although this method seems promising, several challenges were encountered by the authors, who had to balance some electrical anomalies with additional circuitry and also mechanically plug in a PCB at every attempt of bruteforcing the iPhone code. Such method could be applied to Desktop Computers, but the complexity of NAND memories would be way higher and it may unfeasible, in terms of time and complexity, to perform such attack. Countermeasures Side-channel attacks are discovered and presented to the scientific world on a daily basis and suitable defense mechanisms are often not yet implemented or cannot be simply deployed. Even though countermeasures are being studied, it looks like a race between attackers and system engineers trying to make systems more secure and reliable. 3.a) Rowhammer Attack Countermeasures against Rowhammer have already been thoroughly explored, but not many are actually applicable in the mobile context. Powerful functions as CLFLUSH [9] and pagemap [10] have been disabled for users apps, but Rowhammer can still be performed through JavaScript. Furthermore, analyzing the cache hits and miss could raise a flag of alarm, but methods such as [4] dont cause any miss. Error correcting codes arent even that efficient in correcting bit flips. Most hardware vendors doubled the DRAM refresh rate, but results in [11] show that refresh rate would need to be improved by 8 times. Moreover, the power consumption would increase, making this solution not suitable for mobile devices. In Android devices Rowhammer attacks, the biggest threat is still user apps being able to access ION. Google is developing mechanisms so as to avoid it to happen in a malicious way. One solution could be to isolate ION regions controlled by user apps from kernel memory, in order to avoid ad jacent regions. But even in the absence of ION an attacker could force the buddy allocator to reserve memory in kernel memory zones by occupying all the memory available for users apps. Prevention of memory exhaustion need to be considered to avoid Rowhammer countermeasures workarounds. 3.b) Microarchitectural Attack As the final goal of microarchitectural attack is deciphering cryptographic codes (e.g. AES), a straightforward approach to protect them would be to avoid having tight data-dependencies (e.g sequence of cache line accesses or branches must not depend on data). If they depend on private data, the sequence, the program is destined to leak information through the cache. The constant-time implementation of modular exponentiation approach [12] represents a good way to fight data dependency. These are more general rules to follow, whether to combat specific attacks such as Flush + Reload in mobile devices with ARM [8]. Disabling the system interfaces to flush the instruction caches, the Flush-Reload side channels can be removed entirely from ARM- based devices, but feasibility and security of this method havent been studied yet. Also, by removing system calls to have accurate time from Android could mitigate all timing side channels. Another way to fight Flush + Reload would be by preventing physical memory sharing between apps, but that would cause the memory footprint to expand and therefore exposing the system to other Sidechannel attacks. Problem 2 Protocol Design The proposed solution for Problem 1 is represented in Figure 1. To solve this problem, four moments in which the Path-centric channel assignment algorithm from [14] are identified: : B receives a packet on its Channel 1 and, as an interferer is acting on Channel 1 on node A, B cant transmit. B1 is the active subnode, B2 and B3 are inactive subnodes. : B switches from Channel 1 to Channel 2 (total cost: 3), and forward the packet to A through Channel 2 (total cost: 3+6=9). B2 is the active subnode, B1 and B3 are inactive subnodes. A2 is the active subnode, A1 and A3 are inactive subnodes. : A can either transmit on Channel 2 and Channel 3, but transmitting on Channel 2 is more expensive, so it switches to Channel 3 (total cost: 9+3=12). A3 is the active subnode, A1 and A2 are inactive subnodes; : A send the packet at C through Channel 3 (total cost: 12+2=14). Network Applications In our K-out-of-N system we are interested in understanding how much is a probability of getting errors in sensing from N sensor, where K represent a threshold for accepting a reliable measurement. This reasoning follows the binomial distribution: In our case at each node, errors can be induced by a false measurement (with probability ) or by channel flipping a bit during the over-the-air time (with probability ). Therefore for our N-out-of-K nodes system we have: Assuming that and are independent, the final probability of having an erroneous detection is a linear combination of the two: For completion, the probability of a successful measurement and transmission is . Network Standards Spectrum scarcity is a widely known problem in the world of wireless communications. The explosive wireless traffic growth pushes academia and industry to research novel solutions to this problem. Deploying LTE in unlicensed spectrum brings up the conflict problem of LTE-WiFi coexistence. This conflict can be analyzed with a close look at 802.11 MAC level. In Figure 2, a comparison between WLAN MAC layer and what is casually called MAC in LTE is depicted [19]. WiFi 802.11 uses CSMA/CA to regulate accesses in MAC layer. In CSMA, a node senses the traffic before transmitting over the channel. If a carrier signal is sensed in the channel, the node waits until its free. In particular, in CSMA/CA the backoff time of a node is exponential. In LTE, multiple access is handled through TDMA (Time Division Multiple Access) meaning that all accesses to the channel are scheduled. Historically LTE has been developed for environments with little interference, while WiFi combats interference in ISM with CSMA. Using them in the same spectrum would see LTE dominating over WiFi, causing sever performance degradation in both the cases. Several solutions has been proposed and implemented in the past years. Qualcomm [15] and Huawei [16] proposed a separation in time and frequency domain. In [17] a Technology Independent Multiple-Output antenna approach is presented so as to clean interfered 802.11 signals. This method was made more robust in [18] but still they relied on the fact that at least one signal from the two technologies had a clear reference. Traffic demands analysis could help mitigate the performance drop due to interference, but even with an accurate demand estimation, only one can be active at a certain time and frequency, limiting the overall throughput. When interference is high, packet transmission is corrupted and error correction strategies are needed. In WiFi, standard Forward Error Correction (FEC) is used. In FEC, a redundancy is added to the transmitted packet, so as a receiver can detect and eventually correct the wrong received bits. On the other hand, LTE uses HARQ (Hybrid-Automated Repeat reQuest) which is a combination of FEC and ARQ. In the standard implementation of ARQ, redundancy bits are embedded in the packets for error detection. When a corrupted packet is received, the receiver request a new packet to the transmitter. In HARQ, FEC codes are encoded in the packet, so as the receiver can directly correct wrong bits, when a known subset of errors is detected. If an uncorrectable error happens, the ARQ method is used to request a new packet. Hybrid ARQ performs better than ARQ in low signal conditions, but leads to an unfavorable throughput when the signal is good. To better see this interference behavior, a small simulation has been performed using ns3, in particular the LAA-WiFi-coexistence library [20]. The scenario was built using two cells whose radio coverage overlaps. The technologies used are LTE Licensed Assisted Access (LAA) operating on EARFCN 255444 (5.180 GHz), and Wi-Fi 802.11n operating on channel 36 (5.180 GHz). Two base station positioned at 20 mt distance from another, and they both have one user connected to them at a distance of 10 mt. Both BS are connected to a backhaul client node that originates UDP in the downlink direction from client to UE(s). In Figure 3(a) and Figure 3(b), we see how the throughput and the number of packets received by the WiFi BS varies when the two BSs coverage area overlaps and when they are isolated (e.g. their distance is 10 Km). Other scenarios were tested: Figure 4 (a) represent the scenario of two WiFi BSs and Figure 4(b) two LTE BSs. It is possible to see the behavior of the two technologies . Table 1 Throughput A Throughput B Packet loss A Packet loss B Distant BSs Figure 3(a) 73.78 Mbps 77.55 Mbps 4.6% 0% Interfering BSs Figure 3(b) 73.62 Mbps 4.95 Mbps 4.8% 93% Two WiFi BSsFigure 4(a) 53.45 Mbps 54.41 Mbps 27% 25% Two LTE BSsFigure 4 (b) 30.88 Mbps 30.4 Mbps 60% 61% In Figure 4(a) we can see how the channel is split between the two BSs and the Carrier Sensing Multiple Access keeps a high throughput and a low packet loss. In Figure 4(b) we can see how the interference between the two LTE cells affects the throughput and gives a high packetloss. In Table 1 results from simulations are summarized. References [1] R. Spreitzer, V. Moonsamy, T. Korak, S. Mangard. Systematic Classification of Side-Channel Attacks on Mobile Devices ArXiv2016 [2] K. Razavi, B. Gras, E. Bosman, B. Preneel, C. Giurida, and H. Bos. Flip Feng Shui: Hammering a Needle in the Software Stack. In Proceedings of the 25th USENIX Security Symposium, 2016. [3] D. Gruss, C. Maurice, and S. Mangard. Rowhammer.js: A Remote Software-Induced Fault Attack in JavaScript. In Proceedings of the 13th Conference on Detection of Intrusions and Malware Vulnerability Assessment (DIMVA), 2016. [4] V. van der Veen, Y. Fratantonio, M. Lindorfer, D. Gruss, C. Maurice, G. Vigna, H. Bos, K. Razavi, and C. Giuffrida, Drammer: Deterministic Rowhammer Attacks on Mobile Platforms, in Conference on Computer and Communications Security CCS 2016. ACM, 2016, pp. 1675-1689. [5] Z. B. Aweke, S. F. Yitbarek, R. Qiao, R. Das, M. Hicks, Y. Oren, and T. Austin. ANVIL: Software-Based Protection Against Next-Generation Rowhammer Attacks. In Proceedings of the 21st ACM International Conference on Architectural Support for Programming Languages and Operating Systems (ASPLOS), 2016. [6] Ge, Q., Yarom, Y., Cock, D., Heiser, G. (2016).A survey of microarchitectural timing attacks and countermeasures on contemporary hardware. Journal of Cryptographic Engineering [7] Dong HyukWoo and Hsien-Hsin S. Lee. Analyzing performance vulnerability due to resource denial of service attack on chip multiprocessors. In Workshop on Chip Multiprocessor Memory Systems and Interconnects, Phoenix, AZ, US, 2007. [8] X. Zhang, Y. Xiao, and Y. Zhang, Return-Oriented Flush-Reload Side Channels on ARM and Their Implications for Android Devices in Conference on Computer and Communications Security CCS 2016. ACM, 2016, pp. 858-870. [9] M. Seaborn and T. Dullien. Exploiting the DRAM Rowhammer Bug to Gain Kernel Privileges. In Black Hat USA (BH-US), 2015. [10] M. Salyzyn. AOSP Commit 0549ddb9: UPSTREAM: pagemap: do not leak physical addresses to non-privileged userspace. http://goo.gl/Qye2MN,November 2015. [11] Y. Kim, R. Daly, J. Kim, C. Fallin, J. H. Lee, D. Lee, C. Wilkerson, K. Lai, and O. Mutlu. Flipping Bits in Memory Without Accessing Them: An Experimental Study of DRAM Disturbance Errors. In Proceedings of the 41st International Symposium on Computer Architecture (ISCA), 2014. [12] Ernie Brickell. Technologies to improve platform security. Workshop on Cryptographic Hardware and Embedded Systems11 Invited Talk, September 2011. [13] S. Skorobogatov, The Bumpy Road Towards iPhone 5c NAND Mirroring, arXiv ePrint Archive, Report 1609.04327, 2016. [14] Xin, Chunsheng, Liangping Ma, and Chien-Chung Shen. A path-centric channel assignment framework for cognitive radio wireless networks Mobile Networks and Applications 13.5 (2008): 463-476. [15] Qualcomm wants LTE deployed in unlicensed spectrum. http://www.fiercewireless.com/story/qualcomm-wants-lte-deployed-unlicen% sed-spectrum/2013-11-21 [16] Huawei U-LTE solution creates new market opportunities for mobile operators. http://www.huawei.com/ilink/en/about-huawei/newsroom/ press-release/HW 3%27768. [17] S. Gollakota, F. Adib, D. Katabi, and S. Seshan. Clearing the RF smog: making 802.11 robust to cross-technology interference. In Proc. of ACM SIGCOMM, 2011. [18] Y. Yubo, Y. Panlong, L. Xiangyang, T. Yue, Z. Lan, and Y. Lizhao. ZIMO: building cross-technology MIMO to harmonize Zigbee smog with WiFi flash without intervention. In Proc. of MobiCom, 2013. [19] Long-Term Evolution Protocol: How the Standard Impacts Media Access Control Tim Godfrey WMSG Advanced Technology, http://www.nxp.com/files-static/training_presentation/TP_LTE_PHY_MAC.pdf [20] https://www.nsnam.org/wiki/LAA-WiFi-Coexistence

One Of The Hardest Things I had To Do - Original Writing :: Papers

One Of The Hardest Things I had To Do - Original Writing As we drove from the peaceful, secluded surroundings of Hertfordshire into the bustling hub of Heathrow's Terminal 4, it suddenly dawned on me how hard it would be for me to carry out this featà ¢Ã¢â€š ¬Ã‚ ¦ It was the time I was most looking forward to. We had finally been allowed out of the school gates into our eight weeks of freedom. No work had to be handed in the next day, no teachers would moan how over worked, under paid they were and most of all it was not the winter. After careful deliberation my family and I decided to spend our two-week vacation in the all night city of Paris. We were looking forward to the 35oC weather, the theme parks built inside the over developed hotels and one of the greatest wonders of the world, the Eiffel tower. The hotel we wanted to stay at was called the Jolly Hotel Lotti. This hotel was like no other hotel I had ever seen. Not only did it have its own built in theme park with log flumes, roller coasters and any other ride imaginable but it also had twenty to thirty shops and restaurants all inside. To put it mildly, it was huge! On the 21st August, about a week before we left, we received a letter from the hotel's theme park. It told us that for one day only, they would be offering a free ride on the 'Screamer', for anyone who raised more than  £150 in sponsorship. Only when I watched the enclosed video in astonishment, did I realize what this 'ride' was. It was something I had always wanted to do, but had never managed to convince my parents that it was safe. I found out that it was the first bungee jump that allowed anyone over the age of nine to fly through the air at an exhilarating 80 mph at a g-force of 2.5, so you could understand what my parents' reaction would be to my interest.

Legal Prostitution :: essays research papers

Prostitution has long been considered as illegal. But is it necessary to do so? It is said that prostitution causes inconvenience and troubles to general public. However, the act that considers prostitution as illegal causes inconvenience and troubles to prostitutes either. Does general public has the right to live without prostitution nearby, which will prevent prostitutes from making money with their 'resources', or do prostitutes have the right to make money with their 'resources', which will prevent general public from living in 'an more enjoyable' environment? This is obviously a conflict of interest. The right should be granted to the side with more social benefits. For example, if legal prostitution brings the social, says, $100 and at the same time causes $50 harms to general public, the right should be granted to prostitutes. One may argue that it is very difficult to determine which side brings larger social benefits. But under some situations, we can easily determine it. If prostitutions are located in some low-population-density areas, the harms or inconvenience caused by prostitutions will be smaller. But some may argue that although the inconvenience is smaller, people still suffer. If satisfactory compensations for people who suffer are availble, people are willing to suffer. The right to prostitute, or the right to stop prostitution should be granted to general public (or people who are affected by prostitutions) or prostitutes by the time the compensation system operates. However, it is very difficult to delimitate such right. What should be considered as prostitutions? If a female who provides a male with sex service for returns is said to be a prostitute, then is a wife who provide sex service for her husband for his love said to be a prostitute? Is having sex before marriage called as a prostutition? We can see that it is very 'costly' to delimitate such right.

The Human Genome Project Essay -- Genetics Science Biology Essays

The Human Genome Project The Human Genome Project is a long-term project by international scientist to develop detailed genetic and physical maps of the human genome. Researchers are engaged in locating and identifying all of its genes and establishing the sequence of the genes and all other components of the genome. This monstrous task has the potential to dramatically increase our understanding of human evolution and variation, and perhaps most importantly†¦human disease. The success of the Human Genome Project also poses potential societal problems. Some genetic disorders will be detectable long before there will be treatments available for them. Controversy could also arise over reproductive issues. For example, people may consider terminating pregnancies for reasons of genetic makeup, or if there is social pressure to limit reproductive rights or genetic grounds. Issues of genetic discrimination and confidentiality in the insurance industry and employment also must be addressed. The Project In 1988, a committee organized by the National Institutes of Health and the Department of Energy developed an action plan for the Human Genome Project. In 1990, a five-year joint research proposal was submitted to Congress, and in October 1990, the Human Genome Project officially began. The project has been organized and supported primarily by the DOE and the NIH, which established working groups to address genome mapping, computational analysis to handle databases, and the social, legal, and ethical implications of the human genome research. Congress funds the project through the National Center for Human Genome Research at the NIH, which in turn awards grants and contracts to U.S. investigators. Additional funding from Con... ...of the "human being," absolutely outweigh the negative factors. I do believe however that a certain level of education should begin to inform individuals about the project and the results to come, and perhaps fewer problems will result. References Patenting the Human Genome: The Lancet Oct 2, 1999 p1135 The Human Genome Project and Gene Therapy: A genetic counselors perspective Journal of Prenatal & Neonatal Nursing, Dec 1998 p16 The Code Breaker: Discover, May 1998 p44 Genetic Sampling: big brother, or big science? Public Health Reports:Jan-Feb 1998 p71 The Human Genome Project: http://www.ornl.gov/TechResources/Human_Genome/home.html Some Other Useful Web Sites Center Site NIH Human Genome Program http://www.nhgri.nih.gov/HGP/ DOE Human Genome Program http://www.er.doe.gov/production/ober/hug_top.html Genome Database http://gdb.org/

To Kill a Mockingbird Essay – Explain How 2 Characters Changed over the Course of the Book

To Kill A Mockingbird Essay Introduction: * Thesis: In To Kill A Mockingbird, characters such as Calpurnia and Boo Radley are not who they are made out to be in the beginning of the play to both the readers and Scout. * Point 1: Jem and Scout learn that Calpurnia, their housekeeper, is not who they thought she was. * Point 2: The Finchs and the people of the town realize that Boo Radley is not the same man they thought he was. Scout and Jem is not the well-spoken servant they made her out to be all these years in their house.Her role is the household is much different compared to other families. Calpurnia has pretty much taken the role as the â€Å"mom,† in the house. This one time, she disciplined Scout at the dinner table when they had Walter over for dinner and Scout made a rude comment. However, Scout’s and Jem’s view of Calpurnia changed when they went to church with her when Atticus could not take them. When they arrived at the church, Calpurnia was confron ted by Lula for brining â€Å"white chillun† (Lee 119) in a black church. They heard Calpurnia use slang and words they had never ever come out of her mouth.This newly discovered side of Calpurnia confused the children. They could not understand how their well respected and well-spoken housemaid could be so â€Å"dirty. † When Scout questioned her about it later on, Calpurnia explained herself â€Å"folks don’t like to have somebody around knowin’ more than they do. † It aggravates ‘em. You’re not gonna change any of them by talkin’ right, they’ve got to want to learn themselves, and when they don’t want to learn themselves there’s nothing you can do but keep your mouth shut or talk their language. (Lee 126) Calpurnia’s explanation really answered Scout’s question as to why she had to â€Å"talk nigger-talk. † (Lee 125) The people of Maycomb do not have the right perspective of Boo Radle y. The rumor that have surrounded him and his family have caused him to stay within the confines of his home. The rumors say that he killed his mother and stabbed a family member with a pair of scissors. Over the summer, the kids (Scout, Jem, and Dill) acted out the story of Boo Radley and his family over the summer.Also, when Jem and Dill rolled Scout down the hill in the tire, they refused to help Scout get out since she had landed in his (Boo Radley’s) property. However, the children have it all wrong. In the beginning of the book, Jem and Scout start finding gifts in the hole of the oak at the edge of his land which he had been placing there. Another instance where they were proven wrong was when he gave Scout a blanket during the fire that took out Miss Maudie’s home. Again, no one had any idea he had done this.The biggest reason as to why everyone has made out Boo Radley all wrong was when he saved Jem and Scout from Mr. Ewell. Conclusion: * Thesis: In To Kill A Mockingbird, characters such as Calpurnia and Boo Radley are not who they are made out to be in the beginning of the play to both the readers and Scout. * Point 1: Jem and Scout learn that Calpurnia, their housekeeper, is not who they thought she was. * Point 2: The Finchs and the people of the town realize that Boo Radley is not the same man they thought he was.

Dr Jekyll

sTara Stockage Mr. Robinson Dorian Gray and Jekyll Hyde Comparison Essay A March 22, 2013 Comparative Essay The Picture of Dorian Gray and The Strange Case of Dr. Jekyll and Mr. Hyde are both written during the same time period which take place in the 1800s which is the Victorian era. Both stories take place in London. These novels both are written in regards to the gothic style of writing. The Strange case of Dr. Jekyll & Mr. Hyde vs. The Picture of Dorian Gray. The novels, The Strange Case of Dr. Jekyll & Mr.Hyde; written by author Robert Louis Stevenson; and, The Picture of Dorian Gray, written by Oscar Wilde, share the theme of contrast of human nature and personality. One of the aspects that both Stevenson’s The Strange Case of Dr. Jekyll and Mr. Hyde and Wilde’s The Picture of Dorian Gray have in common is the contrast of human nature. Just as Jekyll claims that â€Å"man is not truly one, but truly two†, Dorian proposes that â€Å"Each of us has Heaven an d Hell in him†. In both stories the characters have a way of overlooking the evidence of their own mistakes.Jekyll calms himself by thinking that â€Å"It was Hyde . . . and Hyde alone that was guilty† and by this he was trying to fix the wrongs that Hyde committed. Dorian on the other hand attempted to apologize to Sibyl by writing her a letter after which made him feel as if he was forgiven. Shortly after finishing the letter he learn about Sibyl’s death and overlooks the first changes that his painting goes through and blocks the guilt by thinking â€Å"What did it matter what happened to the colored image on the canvas?He would be safe. That was everything† Dorian says these words to help him escape the obvious truth. The internal conflict of Stevenson’s Dr. Jekyll & Mr. Hyde also can be compared to Oscar Wilde’s The picture of Dorian Gray. Both Mr. Jekyll and Gray go through many experiences that lead them to live a double life. Jekyll i s curious scientist who drinks a potion that makes him turn into a vulgar and tempered man. Jekyll likes the idea of becoming someone else, without anybody truly knowing who Mr. Hyde is.Dorian Gray is a curious and young gentleman who also falls victim to his hope to stay young forever, without anybody really knowing what his true practice is. When we compare both Dorian Gray and Jekyll it is important to say that they both are seen as normal kind good man that both have a dark secret. As being Mr. Hyde, Jekyll feels like he has more freedom to do whatever he wants without being caught as his real self. Both Gray and Jekyll desire to live a life of freedom from discrimination and act towards any wish, but in the end it brings trouble to both because they are hurting people at the same time.Another comparison of these characters is that throughout their experiences, they finally come to terms with their mistakes and the basis to the problem. They both ended their life in their own te rms, by killing the monster that they had become. Gray killed himself by ultimately slaying his portrait that represented the horror and real person that he had become, while Jekyll poisoned himself. I believe in the end they did have sympathy for the horrible things that they had committed, and that is why they killed themselves. Killing themselves, relived them from what they had to live with for the rest of their lives.I feel that the authors of the novels chose to describe the charters this way to have a certain impact of the audience. I believe the authors wanted to make the readers see both sides of the character through a different view point. Also I believe they also wrote it because the authors were describing the person they wish they could be. I believe both authors believe that human nature is always changing. I think that the artist are saying that during their time period known and the Victorian era the human nature of people were always changing .