Sunday, January 26, 2020

IntelliP: Effective Mechanism for Resource Monitoring

IntelliP: Effective Mechanism for Resource Monitoring IntelliP: Effective Mechanism for Resource Monitoring in Private Cloud Vivekanand Adam Abstract—Cloud computing paradigm makes huge virtualized compute resources available to users as pay-as-you-go style. Resource monitoring is the premise of many major operations such as network analysis, management, job scheduling, load balancing, billing, event predicting, fault detecting, and fault recovery in Cloud computing. Cloud computing is more complicated than ordinary network owing to its heterogeneous and dynamic characteristics. Hence, it is a vital part of the Cloud computing system to monitor the existence and characteristics of resources, services, computations, and other entities. Monitoring data between hosts and servers should be consistent, and data transfer from hosts to servers should be efficient. In this paper, I will use an effective mechanism for resource monitoring called IntelliP which is based on a modified push model. It reduces useless monitoring data coherency between hosts and servers in CloudStack. Keywords—Cloud computing, Monitoring, self-adaptive, coherency, CloudStack, IntelliP. I. Introduction Cloud computing has rapidly emerged as a method for service delivery over TCP/IP networks such as the Internet. It disrupts the traditional IT computing environment by providing organizations with an option to outsource the hosting and operations of their mission-critical business applications. Cloud computing paradigm makes huge virtualized compute resources available to users as pay-as-you-go style. Resource monitoring is the premise of many major operations such as network analysis, management, job scheduling, load balancing, billing, event predicting, fault detecting, and fault recovery in Cloud computing. Cloud computing is more complicated than ordinary network owing to its heterogeneous and dynamic characteristics. Hence, it is a vital part of the Cloud computing system to monitor the existence and characteristics of resources, services, computations, and other entities. Apache CloudStack [1] is one of the most popular open source IaaS solutions. CloudStack is the best choice of all open source clouds to migrate the services and integrated the maximum security level in its architecture [2]. In IaaS Cloud environments, two aspects should be considered: 1. IaaS hardware and software: In Cloud environment, there are various kinds of hardware and software, including physical hosts, network devices, storage devices and databases. Monitoring system should obtain the performance data of these hardware and software, and report the real-time running status. 2. The Cloud user’s resources: Everything the user has in the Cloud. These are instances, disk volumes, guest networks, templates, ISOs, etc. For all these components, the Cloud user needs clear and reliable knowledge of their status. My goal is to develop an effective monitoring system for CloudStack which will use an effective mechanism for resource monitoring called IntelliP which is based on a modified push model and it reduces useless monitoring data coherency between hosts and servers. The monitoring system can collect utilization information from both physical and virtual resources. The monitoring metrics should be accurate, i.e. they are as close as possible to the real value to be measured. This can help the administrators know the status of Cloud system, and give end users a clear view of their resources in Cloud. II. Background This existing monitoring system named SCM is proposed to monitoring the Apache CloudStack platform [3]. SCM is a flexible monitoring system supporting for cloud environments, which can monitor both physical and virtual resources. SCM users can choose their interested metrics and set a custom interval. In order to meet these requirements, SCM needs a well-designed user interface, and flexible, dynamic data sources. In Clouds, monitoring metrics are also important to the billing systems, job scheduling and other Cloud components. Because of the characteristics of Cloud environment, the monitoring metrics will be dynamically changed and the volume of data may become very large, a scalable and high performance storage system is needed. The SCM monitoring system has four main functionalities, which are metric collection, information processing and storage, metric display, alert. The architecture of the SCM monitoring system is shown figure 1. Collectors In Apache CloudStack environment, the hosts have different meanings [1]. These hosts may be physical or virtual, customer instances or system virtual machines, so the metrics need to be collected vary with the host’s type. In the SCM monitoring system, they use collectors as the data sources which are deployed on each host. These collectors can easily be configured to collect different metrics. In fact, the collector Figure1. The architecture of the SCM monitoring offers a framework, in which users can develop their own programs to collect metrics they interested in. The collector periodically retrieves performance metric values from the host, e.g. cpu usage, memory usage, disk I/O. When the host becomes management server or storage server, the performance metrics of MySQL, tomcat, NFS and other CloudStack components are also collected. As mentioned above, CloudStack has different network traffics on a host, some of traffics do not to need be monitored. The collector monitors the public and storage traffics. The collector also monitors the network devices through SNMP. These metric values are then pushed to SCM Server. The SCM server The SCM server is the core of the SCM monitoring system. There are five main modules of the SCM server. Host aggregator is used to aggregate the metric values from the collectors. A host aggregator may receive metric values from a lot of collectors. Apache CloudStack provides an API that gives programmatic access to all the management features. They designed the platform aggregator to communicate with ACS management servers and call the ACS API through HTTP to get the CloudStack related information, such as the version of CloudStack and how many zones, pods, clusters and hosts in the current environment, etc. After a pre-set time, the aggregators send the metrics to the storage module. The storage module is used to communicate with the storage system, putting the metric values into the storage system or getting values from it. The storage module receives the metrics from the aggregators and stores all these data locally, when the metrics file is large enough, it puts the metrics into the storage system. This can reduce the I/O operations on the storage system. The statistics module is a data processing module. It analyses the metric values from the storage module and provides the average, minimal, maximum, performance outliers, etc. To improve the availability of the ACS, abnormal running information should be reported to the Cloud users immediately. The alert module obtains exceptions from statistics and records the information, and then notifies the Cloud user. If the ACS scale is large, there are hundreds or thousands of hosts, multiple SCM Servers may be needed for load balance. The SCM Client The metric values are organized as a tuple (metric name, timestamp, value, tags), these tuple are not friendly to the Cloud users. So just collecting various resource utilizations information is not enough to explain the observed performance of hosts or applications. In order to let the Cloud users easily to understand the meaning of these metric values, it is very important to display information in a simple and flexible way. The SCM Client gives an overview of the whole system, and displays the metric values in time series graphs with several filters, which is used to help the Cloud users quickly find the minimal or maximal of the current metric value or calculate the average performance in a period of time. Also the Cloud users can customize the graphs by selecting the metric names and tags in tuples. Then only the interested metric values will be displayed in the user interface. Storage system The metric values need to be stored persistently for analysis as well as displayed on the fly. Resources in the Cloud change dynamically and the deployment of the Cloud is large. Monitoring such distributed system may produce a large amount of metric values. So the storage system should be scalable and flexible, with the ability to collect many thousands of metrics from thousands of hosts and applications at a high rate. Above system uses pure push model for data collection [3], hosts initiatively send running status (CPU, memory, I/O, etc.) to a monitoring server. This model has better real-time, and makes the monitoring data between hosts and servers higher in coherency, but lower in efficiency. Usually, the push model is triggered by a time interval or exceeding a threshold. The value of time interval and threshold is important to this model. If the value is too small, even a little change on hosts may make the status information deliver to monitoring servers over a network. This may cause network congestion. If the value is too big, a lot of useful information may be ignored. It consist useless monitoring data coherency between hosts and servers. A pure Push or Pull model is not suited for many different kinds of virtualized resources III. Related work In Clouds, resource monitoring is the premise of job scheduling, load balancing, billing and many other major operations. Therefore, data coherency and real-time are important indicators for a monitoring system of Clouds. Elastic compute is one of the main characters of Clouds, resources in Clouds change dynamically. So the monitoring system should adapt to this kind of situation. To solve the above problem He Huang and Liqiang Wang proposed a combined push and pull model called PP model for resource monitoring in Cloud computing environment [4]. The PP model inherits the advantages of Push and Pull models. It can intelligently switch between Push and Pull models depending on the resource status and external customer request. But the combination of the push model and pull model is more complex to the pure push model and pull model. When there are a large number of requests, event driven method will increase the load on the monitoring servers, and the servers will become the bottleneck. The switch between push and pull has some extra costs [4] and it consist useless monitoring data coherency between hosts and servers. In an attempt to minimize unnecessary and useless updating massages, and maximize the consistency between the producer and consumer. Wu-Chun Chung and Ruay-Shiung Chang [5] have proposed GRIR (Grid Resource Information Retrieval), which is considered a new algorithm for resource monitoring in grid computing to improve Push model. They examined a set of data delivery protocols for resource monitoring in the push-based model, such as the OSM (OffsetSensitive Mechanism) protocol, the TSM (Time-Sensitive Mechanism) protocol, and the hybrid ACTC (Announcing with Change and Time Consideration) protocol. This hybrid protocol is based on a dynamically adjusted update time interval and the consideration for early update when the change is larger than a dynamic threshold. IV. Proposed solution We can use a self-adaptive mechanism for resource monitoring in Cloud computing environment based on push model. As mentioned earlier, push model has better coherency, but lower efficiency in small threshold situation. We can set up a transportation window to store metrics before they are delivered to the monitoring server. We can design an algorithm to control data delivery. The design of the Self adaptive Push Model Monitoring data between hosts and servers should be consistent, and data transfer from hosts to servers should be efficient. In this section, I introduce a self-adaptive push model called IntelliP, which is based on a modified push model. It reduces useless monitoring data coherency between hosts and servers. IntelliP has a transportation window, as shown in following figure 2. Figure 2: A push model with transportation window. When collectors get metrics from adapters on hosts, instead of delivering these data to servers immediately, they put these metrics into the transportation window. The window accepts a new metric and then compares it with the average value of the former metrics. (1) If diff is smaller than the current threshold, collectors put the metric into the window and keep accepting new data, otherwise, deliver the metric to monitoring server and empty the window. When the window is full deliver the average value of the metrics in the window to monitoring servers. The size of transportation window is not fixed, in order to adapt to the dynamically changing situation of Clouds the window size changes too. Small size means that resources change frequently, and large size hosts are running in a stable status. When the window is full, that means in the past periods of time, hosts were running in a stable status, and the next few periods may still in this status, so the size of window adds one. If diff is bigger than the threshold, it shows that CPU usage, Memory, I/O throughput or other resources of a host changed suddenly. This may indicate that the host becomes active. An IntelliP data delivery control algorithm At this moment, the window size reduces to half of the original size, so more metrics will be delivered to monitoring servers. In push model, the value of threshold is very important. IntelliP decides the size of threshold according to two parameters ÃŽ ± and  µ. Α ÃŽ ± has a close relationship with the current network condition. If current network condition is good, ÃŽ ± is small, more metrics would be delivered. While current network condition is poor, the value of ÃŽ ± increased, less metrics would be on the network. When the network condition is in an ideal status, the value of ÃŽ ± is 1. Another parameter is a constant value set by users. Users can customize the size of  µ according to their requirement. We use m_average as the average value of metrics in window, and define threshold as; threshold= ÃŽ ± Ãâ€"  µ Ãâ€" m (2) One problem is that if the host was running smoothly for a long time and resources usage on this host did not change a lot, then the size of window will be very large. This will lost a lot of metrics. We set an upper limit of window size to solve this problem, when the window size increases to the maximum limit, then the size would not increase any more. . V. conclusion and future work In Clouds, resource monitoring is the premise of job scheduling, load balancing, billing and many other major operations. Therefore, data coherency and real-time are important indicators for a monitoring system of Clouds. Elastic compute is one of the main characters of Clouds, resources in Clouds change dynamically. Using a self-adaptive push model called IntelliP, which is based on a modified push model we can build an effective cloud monitoring system which will reduces network congestion and also reduces useless monitoring data coherency between hosts and servers in CloudStack. In future I will try to improve data delivery control algorithm for increasing effectiveness and adaptive nature of monitoring system, which will be available for all. References Apache Project, Apache CloudStack, 2013 [online] http://cloudstack.apache.org Sasko Ristov and Marjan Gusev, â€Å"Security Evaluation of Open Source Clouds† EuroCon 2013, 1-4 July 2013, Zagreb, Croatia. Lin Kai; Tong Weiqin; Zhang Liping; Hu Chao, SCM: A Design and Implementation of Monitoring System for CloudStack, Cloud and Service Computing (CSC), 2013 International Conference on , vol., no., pp.146,151, 4-6 Nov. 2013. He Huang and Liqiang Wang, PP: a Combined Push-Pull Model for Resource Monitoring in Cloud Computing Environment 2010 IEEE 3rd International Conference on Cloud Computing. W. Chung, R. Chang (2009), A New Mechanism For Resource Monitoring in Grid Computing, Future Generation Computer Systems FGCS 25, PP 1-7.

Saturday, January 18, 2020

Position Supporting Stem Cell Research Essay

Cells that can make a distinction into a variety of cell types are called stem cells and comprise embryonic stem (ES) cells and adult stem cells. Since ES cells can turn into a new organism or can differentiate into any tissue type, they are said to be â€Å"totipotent.† Adult stem cells, conversely, as they cannot turn into any type of tissue, are said to be â€Å"pluripotent.† For instance, bone marrow stem cells can turn into red blood cells, T-lymphocytes, or B-lymphocytes, however not muscle or bone cells. Nerve stem cells can as well turn into different types of nerve tissue. Stem cell research attempts to engineer tissues from the body’s stem cells to replace defective, damaged, or aging tissues. In 1998, scientists were capable to grow human ES cells indefinitely. Since then, researchers have performed stem cell experiments on mammals and have had some achievement in repairing spinal chord injuries in mice. Since scientists cannot use federal funds to carry out research on embryos, private corporations, most particularly the Geron Corporation, have funded ES cell research. Geron, awaiting possible ethical concerns, appointed its own ethics advisory board. The Clinton administration sought to loosen the interpretation of the ban on embryo research to permit the government to sponsor research on the use of ES cells once they were available. President G. W. Bush had made the decision to permit use merely of about sixty existing cell lines, and not the production of embryonic cell lines particularly made for the purpose of use for stem cells[1]. The majority of the stem cell procedures proposed to date would employ the ES cells from embryos formed by couples in fertility clinics. In the United States, thousands of embryos are discarded each year as IVF couples cannot use all of their embryos. A couple may make three-hundred embryos in an attempt give birth to one child. One more approach to stem cell research suggests that researchers make embryos for scientific and medical purposes. This approach, recognized as therapeutic cloning, or somatic cell nuclear transfer (SCNT), engrosses transferring the nucleus from a cell in a person’s body into an enucleated egg[2]. The ES cells from this new embryo would match the tissue in the person’s body, therefore avoiding the potential tissue rejection problems that might occur in stem cell therapy. The potential of stem cell research is huge, for the reason that so many diseases result from tissue damage. Stem cell research could bring about advances in treating paralysis, diabetes, heart disease, pancreatitis, Parkinson’s disease, liver disease, arthritis, as well as many further conditions. [3] Thus human pluripotent stem cell research is very important as firstly it propose help in understanding the actions that take place during normal human development. The understanding of human cell development could make possible further understandings regarding how abnormalities such as cancer occur. Secondly this research helps us to find out why some cells turn into heart cells whereas other cells turn into blood cells. Although it has been previously recognized that a gene turning on and off is central to cell development, however it is not recognized what makes these gene turn on and off–stem cell research will most probably give a possible explanation. In a realistic sense this could make possible further understandings of cell development abnormalities. Thirdly pure samples of specific cell types could be used for testing different chemical compounds so as to develop medicines to treat disease[4]. This would make more efficient the process of medical testing in order that merely medicines that have a helpful effect on cell lines would be tested on animals and humans. And most significantly this research could be very helpful for cell transplantation therapies. Theoretically, stem cells could be â€Å"grown† into replacements for diseased or destroyed cells[5]. This would permit medical science to get to the bottom of diseases of organ failure for instance diabetes as well as neurological disorders for instance Parkinson’s disease. The main protest to this promising research has to do with the source of ES cells. ES cells can be acquired from aborted embryos, embryos remaining after infertility treatments (IVF), embryos created only for research by IVF techniques, and from SCNT techniques (that is therapeutic cloning)[6]. To get ES cells, consequently, one have to either create embryos that will be used, manipulated, or destroyed, or one have to get embryos leftover from infertility treatments. However here is where the abortion debate resurfaces, as these techniques would engross treating embryos as mere things or objects and would not give embryos the esteem they deserve, as said by some critics. That is to say that a proper, fair and realistic account of what comes out of the freezer is a 5-day-old ball of about 150 cells, and of that the researchers will want to use about 30. What comes out of the freezer is unquestionably human tissue however it is not human. That ball of cells has no hope at all of becoming a human being without further intervention. One must not confuse the existence of a chance of becoming a human being with actually being human. The tissue can be likened to organs taken from a lately deceased person for transplant. Neither the organ nor the tissue is dead; it is human tissue but it is not human. One may say the same of sperm, for instance, every sperm must be protected that is available for the reason that it might, under circumstances where other things have to happen, become a human. That is practically the same thought. What has to happen there is that the sperm has to meet with an egg to fertilize that egg, which then has to be looked after. What has to happen with a 5-day-old ball of cells in which the egg and sperm have previously met is that it after that has to be implanted in a woman and stay there for nine months. In both cases nothing is going to happen unless other things are brought into play. It is a very strong view that it is not being talked about a human, rather about human tissue that will with the intervention of others, and only with the intervention of others, has the chance of becoming human. A parent’s right must be supported to demand that any of these untouched fertilized eggs be left untouched for afterward use or not be used for research. Very few, if any, parents who have had the advantage of the IVF program would refuse the chance for spare fertilized eggs to be used. They themselves turned to the wonders of science to give them what apparently nature was otherwise going to deny them, those who through the wonders of science have had what must have been their greatest dream realized would definitely not deny the chance for science to make better things for others. After all, how many fertilized eggs at varying stages of development were used in the IVF programs to get to the point where one could have a successful IVF program? †¦ [7] Some supporters of this bill do not deny where one is now with the science. He just wants science to have the opportunity to take him to further and better places. One cannot say that there is no practical application of this now, so not do the research. That is the equal of saying to a child that you are not permitted to swim in the pool until you have learned to swim. How can one possibly refuse to do research on the basis that he does not have the researchers’ outcomes? One can not get those outcomes until he proceeds with the research. So, again, one must be very much on the side of proceeding with stem cell research. Some of the objections which have their foundation in a religious view held by their proponents. Living by a decent set of values is far more vital than defending the doctrine of one church over another. If you lead a good life and if there is a kingdom of heaven you will be welcome into his or heaven. Your religion is your business and no-one else’s. When you make your religion an issue, you drag it into the political domain and you tarnish it. It follows that we attach very little importance or interest to arguments over religious dogma. Similarly, we do not turn to the state to legislate for one religious view over another. Without doubt, we can clearly see the risks of adopting a view that your religion is the right one and the rest of the world must be converted. This point is quite simple: each to his own religion. If you say to one that doing something is against God’s will, then he will respond by assuring you that, if God is annoyed, God will punish whoever has done that thing. The state should never be used as God’s enforcer. Over the years, as we have been approaching 50, we can assure you that we have every confidence in God’s capability to settle accounts. It has not been our experience that he or she usually waits until you are dead. Numerous people who have done the wrong thing have met their maker in a practical sense while they were still alive[8]. In brief, we are talking about fertilized eggs that are in the freezer. They have not the slightest chance of becoming human unless they are accepted by the mother to be carried for 9 months. We are talking about fertilized eggs where that is not the case. The outcome is that they are either going in the bin or going to be used for the betterment of mankind. My other proposition is that we cannot now say whether the science is good or bad. We do not know where the science is going to take us. Science of itself is not fundamentally good or bad; it is what we do with it that will make that case. We have to understand that the benefits of this research may take years to come. That merely makes us say: start more quickly. We simply ask those who, due to their religious beliefs, have a very authentic concern regarding this bill to accept that they are entitled to follow their religious beliefs; they are not entitled to demand by legislation that everybody else does the same. References: Adil E. Shamoo, David B. Resnik. Responsible Conduct of Research; Oxford University Press, 2003 Daniel Callahan. What Price Better Health? Hazards of the Research Imperative; University of California Press, 2003 John Harris. On Cloning; Routledge, 2004 Sandra Braman. Biotechnology and Communication: The Meta-Technologies of Information; Lawrence Erlbaum Associates, 2004 Thomas Kemp. â€Å"The Stem Cell Debate: A Veblenian Perspective†; Journal of Economic Issues, Vol. 38, 2004. [1] Daniel Callahanpg 55 [2] John Harris, pg 90 [3] Daniel Callahan, pg 67-69 [4] Thomas Kemp, pg 6 [5] ibid [6] John Harris, pg 78-79 [7] Sandra Braman, pg 105 [8] Adil E. Shamoo, David B. Resnik, pg 210

Thursday, January 9, 2020

The Little-Known Secrets to Ap English Literature Q2 Essay Samples

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Wednesday, January 1, 2020

Essay the dead - 504 Words

â€Å"The Dead† nbsp;nbsp;nbsp;nbsp;nbsp;Some say that people never change. They may be right, but no one really knows. What people do know is that every living person has one thing in common, something that will never change. Everyone will die, there’s no way around it. Every â€Å"new† and â€Å"old† generation will succumb to the same ghastly fate. The differences in the â€Å"old† generation and â€Å"new† generation sometimes collide in life. The contrast between generations in James Joyce’s â€Å"The Dead† is similar to the contrast in the generations today. The â€Å"baby boomer† generation is the old fashioned generation preoccupied with hospitality and tradition, where as, â€Å"generation x† is the new generation, preoccupied with knowledge and intellect.†¦show more content†¦This generation is preoccupied with the search for knowledge. The new generation is educated and knows things that the older generation has no co ncept of, which was evident several times during Gabriel’s speech at the dinner table. Gabriel’s aunt did not understand what Gabriel speech was about, but she still smiled and was hospitable which corresponds with the qualities of her generation. The newer generation is always tormented with thought. They are constantly thinking of what some one else is thinking, or some one else is feeling. Gabriel is distraught when he tries to understand his wife and why she is upset. When he finds out what the problem is, he finds out he was wrong and he doesn’t know everything, although he sometimes thinks so. The newer generation tries to better themselves through knowledge, but sometimes fails because of the lack of passion and the qualities of the older generation. nbsp;nbsp;nbsp;nbsp;nbsp;The generations in â€Å"The Dead† differ because what one has, the other lacks. The older generation overflows with generosity, compassion, and hospitality, lacking knowledge. The newer generation is growing in knowledge and education, but fails to express the love and nationalism that the older generation displays. The gap in generations is a common way of life that is evident between generations today. The generations are linked only in that they will experience the love and lossShow MoreRelated The Dead Essay474 Words   |  2 PagesThe Dead 1) Symbolic meaning of snow†¦ a. Beginning when first enters Aunts house (warmth) he is out of the snow = coldness, isolation and inhumanity. But when enters the home he is surrounded with warmth and acceptance. Pages 10-11 b. Page 25 Gabriel was nervous about presenting his speech and sought comfort at a window. Looking outside at the falling snow, Gabriel he received a form of release, escape and feeling that he is unknown. c. 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What begins as a harmless portrait of simple human interactions, morphs slowly into an examination of the nature of time and memory. James Joyce uses every level of his writing in o rder to reveal this complex paradox. He breaks down the boundaries of life and death, of time and memory, by breaking down the structure of his grammar. He exposes the ambiguities of existence through the ambiguities of pronouns. In the midst of this acrobaticRead MoreThe Dead By James Joyce2111 Words   |  9 Pagesstory a sort of epiphany that leads them to realize the source of their unhappiness, oftentimes, the characters choose to do nothing about it. Farrington, the protagonist in the short story â€Å"Counterparts,† and Gabriel Conroy, the protagonist in â€Å"The Dead,† are two very different characters. Joyce uses this steep contrast between Farrington and Gabriel to argue about the circle of life and its routineness, and how happy endings are not common or to be expected no matter the circumstance. FarringtonRead MoreThe Theme of Death in The Dead Essay1151 Words   |  5 PagesAlthough a scene of a funeral home might come to mind when a reader first hears a short story aptly named â€Å"The Dead,† the tale actually takes place in the festive setting of a winter dance at the home of the two aunts of the main character, Gabriel Conroy. James Joyce’s short story â€Å"The Dead† has a literal title, because its main concept is death – both physical death and spiritual death. Gabriel Conroy and his wife, Gretta Conroy, attend a party held by Gabriel’s aunts, Kate Morkan and JuliaRead MoreThe Dead By James Joyce Essay942 Words   |  4 Pagesnarrative writer in modern times. Joyce conveyed this new writing style through his stylistic devices such as the stream of consciousness, and a complex set of mythic parallels and literary parodies. This mythic parallel is called an epiphany. â€Å"The Dead† by Joyce was written as a part of Joyce’s collection called â€Å"The Dubliners†. Joyce’s influence behind writing the short story was all around him. The growing nationalist Irish movement around Dublin, Ireland greatly influences Joyce’s inspirationRead MoreJames Joyce s Araby And The Dead1176 Words   |  5 Pages James Joyce’s short stories â€Å"Araby† and â€Å"The Dead† both depict self-discovery as being defined by moments of epiphany. Both portray characters who experience similar emotion s and who, at the ends of the stories, confront similarly harsh realities of self-discovery. In each of these stories, Joyce builds up to the moment of epiphany through a careful structure of events and emotions that leads both protagonists to a redefining moment of self-discovery. The main characters in both these stories