...8. Figure 11.10 shows an undirected graph representing a section of a department store. The vertices indicate where cashiers are located; the edges denote unblocked aisles between cashiers. The department store wants to set up a security system where (plainclothes) guards are placed at certain cashier locations so that each cashier either has a guard at his or her location or is only one aisle away from a cashier who has a guard. What is the smallest number of guards needed? I think {a}→{a,d,e,b},{i}→{i,h,e,j},{g}→{f,c,k,g}, where {x}→{T} is meant that we put a guard at x that covers all elements in T. Now we have to prove that we cant get what we desire with a smaller number of guards. Therefore we take 2 guards, and if not possible with 2 its not with one, as well. To cover the elements in the set {d,e,h} we requires 2 guards from {d,e,h,I,a}. If it is the 2nd case then no guards from this set can cover for instance g, Therefore we would have once again at least 3 guards. 11. Let G be a graph that satisfies the condition in Exercise 10. (a) Must G be loop-free? (b) Could G be a multigraph? (c) If G has n vertices, can we determine how many edges it has? Eliminating an edge from the loop will still lead to a connected graph, therefore it is a necessity. It cant be since eliminating from a vertex with degree more than 1 will still result in a connected graph. It can be verified that these sorts of graphs are tress, therefore the number of...
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...Chapter 11: Sec 11.1 /3 Sec 11.1 /6 6. If a, b are distinct vertices in a connected undirected graph G, the distance from a to b is defined to be the length of a shortest path from a to b (when a =b the distance is defined to be 0). For the graph in Fig. 11.9, find the distances from d to (each of) the other vertices in G. Sec 11.1 /8 Figure 11.10 shows an undirected graph representing a section of a department store. The vertices indicate where cashiers are located; the edges denote unblocked aisles between cashiers. The department store wants to set up a security system where (plainclothes) guards are placed at certain cashier locations so that each cashier either has a guard at his or her location or is only one aisle away from a cashier who has a guard. What is the smallest number of guards needed? a b c Sec 11.1 /11 10. Give an example of a connected graph G where removing any edge of G results in a disconnected graph. 11. Let G be a graph that satisfies the condition in Exercise 10. (a) Must G be loop-free? (b) Could G be a multigraph? (c) If G has n vertices, can we determine how many edges it has? Sec 11.1 /15 15. For the undirected graph in Fig. 11.12, find and solve a recurrence relation for the number of closed v-v walks of length n ≥ 1, if we allow such a walk, in this case, to contain or consist of one or more loops. Sec 11.1 /16 16. Unit-Interval Graphs. For n ≥ 1, we start with n closed intervals of unit length...
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...latency levels at a playable level. Think of the individual areas as throttles on engines. They have to constantly speed up and slow down to make sure the data transfer rate remains constant and connected. To ensure a stable gaming environment most servers connect players based on distance from the main server. Players must occasionally adjust settings to maintain performance on higher end games. Gaming consoles tend to do these corrections automatically without much input from the user. Personal computers, on the other hand, tend to allow a user to micromanage almost every aspect of their connections and settings. Overall, the technology involved and innovation in the industry is constantly evolving and changing the face of connectivity on a daily basis....
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...Network Connectivity Issues Robert Collazo Rasmussen College Authors Note This Written Assignment is being submitted on November, 04 2012 for Mr. Mehran Alidaei COG-N127 Section PAS-6T Microsoft Windows Workstations. What type of performance analysis would you perform to isolate the network connectivity issues? The analysis should include the questions you would ask of the users and any network team member. The first thing that I would do is first talk to my users and figure out who is experiencing network connection issues. Now that I’ve isolated who is having the problems I can go from there. It could be a numerous amout of things I would first have to go to their network and sharing center and use the trouble shoot key to see what issues are there. Define and determine the tools or diagnostics that could be implemented based on your analysis of the network issues. We can use ipconfig/all to make sure we are leasing a good ip address and not a 169 address which indicates connectivity issues also we can ping certain IP addresses to see if we get reply then comes the normal stuff checking wires and making sure everything is plugged in and check for faulty equipment which is usually 99% of your connectivity issues. Explain what steps can be implemented to possibly prevent these network issues from occurring. I believe staying vigilant and visiting access point routinely to make sure equipment and wires and properly connected and making sure users understand also...
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...1. Develop a use case diagram for CRS clearly showing the actor(s) and activities involved in the system. Use case diagram shows relation between the actor and their component. Student can request a course catalog to choose their course while registering. More, they also can view their report card online but must validate their ID first. Professor need to log in in the system to select the course that they want or wish to teach and must be eligible to teach. If not eligible, the professor schedule is clash with the class time. Registrar is acting like a admin of the registration system. This is because he or she can open and close the registration period. Normally, the registration time is one week. Other than that, the registrar will update information each student and professor indirectly maintenance the registration system. 2. Develop sequence diagrams for Register for Course and View Report Card use case. a) Register for Course To register their course, student need to log in and validate their ID from the system. after their ID is verified, they must check all their information in the system is correct or not. After that, they can select the course that they want to learn in the new semester. The course choice has a limit of four only each student. From the corse catalog given, they will make a choice because in the catalog listed all information about the course and the professor. When the course is alloted for the student, they will get their class schedule. ...
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...Name while still being located in separate offices. The organization currently own 25 servers and they expect to have to purchase up to thirty more to accommodate the new branch office. The design will allow for providing service to 5000 users with the thought of future growth being applied to the new network design. It has been suggested that certain resources are to be centralized which would help to reduce costs. With all of this in mind, the team came up with the necessary design while trying to keep costs down to a minimum. Quantity of Connectivity Equipment In order to successfully link all of the new branches there will be several connectivity devices that are required. The design for the organization will need to include seven new branch offices in five states; each branch office will consist of five floors each. This expansion of the company will require the company to purchase several new hardware connectivity devices in order to ensure that the expansion is successful. In order to do this I would recommend that each branch is equipped with five switches, one for each floor. This will require thirty-five switches total for all of the branches. Each floor will be set up as a small network with permissions to connect to each of the other floors in the branch. In addition to the switches, each branch in the organization will need to have their own router. The individual branches will need their own router in order to connect to the other...
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...Is Connectivity A Human Right? For almost ten years, Facebook has been on a mission to make the world more open and connected. For us, that means the entire world — not just the richest, most developed countries. We’ve made good progress, and today we connect more than billion people through Facebook each month. But as we started thinking about connecting the next 5 billion people, we realized something important: the vast majority of people in the world don’t have any access to the internet. Below, I’ll discuss the state of the internet today, why connectivity is such an important problem for the world, the major issues we’ll need to solve — technical, social and economic — and then I’ll outline a rough plan to accomplish this goal. I’m focused on this because I believe it is one of the greatest challenges of our generation. The unfair economic reality is that those already on Facebook have way more money than the rest of the world combined, so it may not actually be profitable for us to serve the next few billion people for a very long time, if ever. But we believe everyone deserves to be connected. The state of the internet Today, only billion people — a little more than one third of the world’s population — have internet access. Even more surprising, internet adoption is growing by less than 9% each year, which is slow considering how early we are in its development and that it is expected to slow further. There are more than 5 billion mobile phones in the world, with...
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...Nowadays, amazing changes in communication have affected interpersonal relationship, because the new tendency and new concepts are different from the past. The varieties of technology bring people many benefits. Moreover, with the development of the era and society, human being gradually will be influenced by some factors. Now perspectives are totally different from traditional world, and the character of people similarly has changed rather than follow the traditional tendency. “Connectivity And Its Discontents” is written by the Sherry Turkle. Turkle describes that technology weaken interpersonal relationships among friends and family. Even though the technology always lets people contact with friends and family more conveniently and quickly,...
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...The research focuses on investigating the factors affecting broadband connectivity in Malawian ordinary schools with the aim to understand the challenges that characterizes the current low broadband penetration. The aim of this study is to use the research instruments to derive critical information (from data collection sources), that will inform the development of relevant measures and recommendations required to address the challenges in providing broadband connectivity in schools. The premise for this research is that Malawi has policies and regulations that support the provision of broadband connectivity in schools and that these policy and regulatory tools should advance the roll-out of broadband in schools. In investigating the challenges with the broadband provision in Malawi ordinary schools, the study will focus on examining the institutional arrangements, strengths and weaknesses of the existing policies and regulations that seek to promote broadband provision in schools. It will look at the effectiveness of the existing funding and investment mechanisms that aims at supporting schools connectivity to determine the appropriate funding model. The study will also examine the adequacy of the available broadband infrastructure to connect schools, focusing on infrastructure roll-out challenges. It will also focus on identifying other key barriers in providing broadband connectivity to schools, with a view to understand both education and ICT related factors that brought...
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...Maintaining Exchange 2010 Connectivity Author Note This research is being submitted on August 29, 2013, for N234/CET2810C Section 01 Microsoft Exchange Server course. Maintaining Exchange 2010 Connectivity There are a lot of things that could prevent you from being able to access the network or the internet all together. These problems mostly revolve around configuration issues and the other portion is due to hardware malfunction. When trying to identify wired or wireless connection problems you will need to begin with the most common issues first. A lot of the times it’s something as simple as an employee coming to you and cant access the wireless network I’ve gotten this issue brought to my attention a million times and I’ve come to find out that a lot of laptop manufactures put a switch on somewhere on the machine itself either it’s a combination of the function key with an F# key and the actual switch is located on the sides of the machine somewhere that will enable or disable the wireless network adaptor. Trust me if you didn’t know about these disable switches you will be in for a huge headache. Also if you get another user that can’t access the wireless network and you checked the switches and everything is fine and you can see the wireless network on your connections list but still can’t access it. The problem might be associated with a WPA, WEP, or WPA2 security key or phrase issue (Microsoft, 2011). When you're trying to troubleshoot something as complex...
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...Unit 4 Exercise 1 Site-to-site Connectivity Scenario Chris Northington Junior Admin, To troubleshoot these issues, use the following utilities: * Domain Controller Diagnostics (Dcdiag.exe) and Network Diagnostics (Netdiag.exe) utilities. You can obtain these tools from the Windows 2000 Support Tools on the Windows 2000 CD-ROM. For more information, click the following article number to view the article in the Microsoft Knowledge Base: 301423 How to install the Windows 2000 Support Tools to a Windows 2000 Server-based computer For additional information about how to obtain and use the Dcdiag.exe and Netdiag.exe diagnostic utilities, click the following article number to view the article in the Microsoft Knowledge Base: 265706 DCDiag and NetDiag in Windows 2000 Facilitate Domain Join and DC Creation * Replication diagnostics utility (Repadmin.exe). Use this tool to verify correct site links and to display inbound and outbound connections. You can also use it to display the replication queue. You can obtain this tool from the Windows 2000 Support Tools on the Windows 2000 CD-ROM. For more information, click the following article number to view the article in the Microsoft Knowledge Base: For additional information about how to obtain and use the Repadmin.exe utility, click the following article number to view the article in the Microsoft Knowledge Base: 229896 Using Repadmin.exe to Troubleshoot Active Directory Replication * File Replication Service...
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...ARPAN SADHUKHAN |81,BIJOY KRISHNA GOSWAMI ROAD, DUCKGHAR PARA,P.O-SANTIPUR, DIST.-NADIA, WEST BENGAL. Cell No.: +91 9681479676 E-Mail: arpan2k6@gmail.com/ arpan_sadhukhan@yahoo.com | | Young and dynamic engineering student of Information Technology seeking an opportunity to deliver the subject in specific areas acquired by virtue of my education and project experience where my knowledge in this field would add value to operation. technical skills key software skills: |♦ Languages : |C, Core JAVA and Basic knowledge of J2EE. | |♦ Subjects of interest : |DBMS, SQL, and MYSQL. | | | | | | | Core Competency • Smart Worker • Ability to work and perform in groups, believe in team work for achieving success, possess highly positive attitude • Leadership qualities with capability of motivating peers • Quick learner, adaptability to technology • Capable of producing high quality output, while on a project, maintaining schedules Work Experience | Industrial Training |Training and project on Web based application ...
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...Back Foot Connectivity in Pitching by Jonathan de Marte – January 2nd, 2018 A mechanical predicament I have come to in the last year is whether or not a pitcher’s back foot should be connected with the ground at the point where the ball releases the hand. After analyzing teammates mechanics and comparing with big leaguers, I noticed that almost every pitcher with plus velocity has some sort of back-foot connectivity with the ground at release point. When I compared with major leaguers, I noticed the same positioning at release. Almost all were connected, or an inch or two from the ground. This is so important for me because I noticed that when I release the ball, my back foot is roughly 6-8 inches from the ground. I believe this leads to a...
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...資料庫系統概論 第一章 問題回顧 1.1 請定義下列的術語：資料、資料庫、DBMS、資料庫系統、資料庫目錄、程 式資料獨立、使用者景觀 、DBA、終端使用者、固定交易、演繹資料庫系統、 永久物件、中繼資料、交易處理應用程式。 資料：已經紀錄的事實。 資料庫：一群相關資料的集合。 DBMS：一種能讓使用者有能力去建立與維護資料庫的程式所組成的集合。 資料庫系統：電腦化的資料儲存系統包含資料庫與資料庫管理系統軟體。 程式資料獨立：在 DBMS 目錄裡，資料檔案的結構和存取程式是分開的。 使用者視界：資料庫的子集合或是由資料庫檔案所衍生出來的虛擬資料。 DBA：負責管理資料庫以及 DBMS 與其他相關軟體。 終端使用者：使用資料庫來查詢、更新以及產生報表的使用者。 固定交易：查詢與更新已經經過嚴謹程式化和測試過的資料庫。 演繹資料庫系統：提供定義演繹規則的能力，能從已儲存的資料庫事實中推論出新資訊。 永久物件：程式語言的複雜物件可以永久儲存在物件導向的 DBMS 中。 中繼資料：儲存在目錄裡的資訊，描述主要資料庫的結構。 交易處理應用程式：執行一個牽涉資料庫存取的程式或一個處理動作，確保一個或是多個交易能 夠與其他交易隔離，不互相影響。 1.2 何謂資料庫所包含的四種主要動作？試簡略討論。 定義資料庫是指定哪些要儲存在資料庫裡面的資料其資料型態、結構與限制。 建構資料庫則是指將資料本身儲存到 DBMS 控制下的儲存媒體的過程。 處理資料庫包括為了擷取特定資料而查詢資料庫、為了反應迷你世界的改變而更新資料庫，以及 由資料產生報表等諸如此類的功能。 共享資料庫則是指允許多個使用者與程式同時存取資料庫。 1.4 DBA 與資料庫設計師的責任為何？ DBA：負責授權存取資料庫、協調及監督資料庫的使用，以及取得所需的軟硬體資源。 資料庫設計師 與所有使用資料庫的使用者溝通 設計符合他們的資料與處理需求的資料庫視界 ： ， ， 再把所有的視界分析與整合。 1.5 資料庫終端使用者有哪些類型？請說明每個人的主要活動。 偶而使用的終端使用者：使用經過設計的資料庫查詢語言來指定他門的需求。 初學或固定模式的終端使用者：固定交易。 熟練的終端使用者：設計滿足他們繁雜需求的應用程式。 單機使用者：使用一種圖形化介面而容易使用的現成套裝軟體，來維護個人的資料庫。 1.6 請說明 DBMS 應該提供的功能。 控制重複性 限制未授權的存取 提供程式物件永久的儲存空間 提供有效查詢處理的儲存結構、 、 、 、 提供備份與回復、提供多重使用者介面、表示資料之間的複雜關係、實施完整性限制、允許使用 規則來進行推理與主動性。 習題 1.1 請指出你可能應用到圖 1.2 資料庫上的一些簡單的查詢與更新動作。 查詢：取得 Smith 的成績單。 更新：輸入 Smith 的成績為 A。 1.2 受控制的重複性與未控制的重複性之間有何不同？請舉例說明。 受控制的重複性改善查詢效能，並防止檔案間的不一致， 未受控制的重複性會因為錯誤的輸入導致檔案資料不一致 在 GRADE_REPORT 檔案中重複儲存 Student_Name 和 Course_number， 受控制的重複性如下 Student_ number 17 17 8 8 8 8 Student_Name Smith Smith Brown Brown Brown Brown Section_identifier 112 119 86 92 102 135 Course_number...
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...information in the form of tables that are similar to worksheets but are designed for gathering large and various types of data that is stored in other tables and locations, and even in fields in other tables. The practice of creating a group within a group and then performing calculations are far more difficult using Microsoft Excel. In addition, “professional developers have found that Microsoft Office Access can save time and meet business requirements for many applications.” (Microsoft Corporation, 2006) With Microsoft Access, someone can integrate tables, forms, queries to their database from other Access databases. Microsoft SQL (Structured Query Language) Server databases, Windows SharePoint Services sites, ODBC (Open Database Connectivity) data sources, Excel, and other data sources all have the capability to work with Access. (Microsoft Corporation, 2006) Due to the large range of information that can be collected using Microsoft Access, this can make creating reports, sharing with co-workers and time management easier and more effective. Databases are good for finding connections in data. “Microsoft Office Access can play a useful role in meeting a wide range of data-tracking requirements.” (Microsoft Corporation, 2006) Microsoft Office Access gives the user an extremely “powerful data editing capabilities” (Smothers, 2009) that can be well-maintained for future uses. References Microsoft Corporation. (2006, June). Microsoft Office Access. Retrieved from...
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