Graphical User Interface For The 3 Axis Cnc Milling Machine Computer Science Essay

Graphical User Interface For The 3 Axis Cnc Milling Machine Computer Science Essay This paper details the design and development of a Graphical User Interface for the 3-Axis CNC Milling Machine, which was designed in-house for testing and research purposes at the University of the South Pacific. The 3-axis CNC Milling Machine used COM Port terminal software, TeraTerm to communicate with the electronics hardware via RS232 link. The GUI was developed using Microsoft ® Visual Basic 2008 Integrated Development Environment. The end result is an interface that is user friendly and is capable of controlling various tasks of the Milling Machine. This paper aims to explain how simple components of Microsoft ® Visual Basic 2008 has been used to design a Windows ® based user interface which is capable of complete control of CNC milling machine. Keywords: GUI, Serial Port, CNC, G Codes, STEP NC 1. INTRODUCTION Over the years a number of methods have been developed to control machine tools. The most widespread used throughout the industry is the G Code language for NC machine tools programming. It is based on the data model stipulated by ISO6983, and has been used for over 50 years [1]. G codes, however, limits the usage of todays fast evolving high-performance hardware [2]. The latest development in NC machine tools programming is ISO 14649 or STEP NC. It is a new standard for data transferring between CAD/CAM systems and CNC machines. It remedies the shortcomings of ISO 6983 by specifying the machining processes rather than machine toolmotion by means of Workingstep, as the basic entity [1] Whichever method of programming NC machine tools is used, it is always important to verify the program before doing actual testing. Verification of NC part programs using a PC is inexpensive compared to testing on model parts. Cutting simulation as a means of testing and verifying NC cutting paths has become an important part of modern machining [3]. With the latest advancements in PC technology and 3D graphics it is much easier to simulate NC cutting paths. A common CNC executes G-code programs, which are generated as a result of planning and scheduling in CAM tools [4]. However an interface is required to send or execute NC part program to the CNC. The user interface is the communication Tool between the operator and the PC-based CNC drilling machine, via the computer screen [5]. The recent advancement in software development technology using Object Oriented Programming (OOP) has made it possible to create simple user interface with a sound communication link to control NC machines. In 2002 [5], a GUI was developed at the University of the South Pacific for a PC-Based computer numeric control drilling machine. The platform for the graphical user interface (GUI) was written in Borlands new rapid application product, C++ Builder ®. Gordon and Hillery [6] developed a Windows ® based graphical user interface for their CNC cutting machine. The user interface communicated with the machine via RS232 serial link. The programming environment used was Borland C++ Builder 3, which allowed the visual development of the program interface. The user interface developed also had features for homing the three axes, editing of NC part program (G Codes) and also previewing the two dimensional cutter motion. This paper mainly focuses on the design of the Graphical User Interface (GUI) for the 3-Axis CNC milling machine. The user interface has been designed in Microsoft ® Visual Basic 2008 Integrated Development Environment (IDE). The features of the GUI are explained in detail. 2. OVERVIEW OF CNC MILLING MACHINE The CNC Milling Machine was designed in-house at the School of Engineering and Physics (SEP) at the University of the South Pacific (USP), for testing and research purposes. It uses an absolute three dimensional coordinate system to create its tool path. It sequentially passes instructions which are in the form of three dimensional coordinates to the Milling Machine for controlling the tool, similar to how G Codes are used. The operational framework of the CNC milling machine is shown in Figure 2.1. It consists of a dedicated PC running Graphical User Interface Software which is used to upload a text file containing X, Y and Z coordinates. It also has features to control the milling operations and to get a two dimensional cutter path preview. The software is linked to the electronics hardware via RS232 serial link. Figure 2.1 Operational framework of the CNC Milling Machine The current CNC Milling machine is only capable of linear interpolation (G01), in terms of G Codes, or moving linearly from one point in the three dimensional space to the next point. To mill different geometries other than straight lines the milling machine has to be given a number of coordinate points which can be used to approximate that particular geometry. For instance to mill a curve the milling machine needs to be given a set of points which lie on the curve. Similar method was used by Min-Yang Yang and Won-Pyo Hong [7] in their three dimensional linear interpolation algorithm. The CNC Milling Machine uses an absolute three dimensional coordinate system (X, Y, and Z) for its tool path generation. The three dimensional coordinates are defined in a text file. Each of the three coordinates has three characters in the text file for instance the X coordinate 0 is defined as 000 in the text file. The Basic Length Unit (BLU) is in millimeters. The electronics architecture of the CNC milling machine consisted of five PIC microcontrollers (PIC16F877) in a distributed architecture, with one master controller and several slave controllers. The master controller of the CNC Milling Machine consists of a PIC16F877 microcontroller which is responsible for coordinating and controlling the overall operations of the Machine. It is the central intelligence system of the CNC Milling Machine. It receives its commands from the user through a user interface and commands other co PIC16F877 Microcontrollers in a distributed architecture to carry out their respective tasks. The mechanical hardware consists of three stepper motors which drive the three axis of the CNC Milling Machine. It also has a 24V DC Motor which is the spindle motor. The worktable consists of clamps to clamp the workpiece firmly on the worktable. For feedback, the machine constitutes of limit switches which control the limit of the worktable. 3. USER INTERFACE Until recently, the CNC machine was using COM port terminal software, TeraTerm, to communicate with Master Controller via RS232 link. The GUI was designed to provide a user friendly interface instead of typing coordinates in TeraTerm. The GUI was designed using Microsoft ® Visual Basic 2008 and coded in BASIC (Beginners All purpose Symbolic Instruction Code). The overall design of the main form of the user interface is shown in Figure 3.1. Figure 3.1 Main form of the GUI It was decided to incorporate the following features in the GUI Opening of text file which contains the coordinates. Previewing of coordinate file (or tool path) in two dimensional X and Y axis Communication with the CNC Machine via RS232 link Milling control features such as homing, manual jog etc Displaying coordinate file 3.1 File Input The GUI contains a MenuStrip at the top of the main form on which there are three menus, File, Setup and Help. The File menu contains an Open menu which opens a file browser window as shown in Figure 3.1.1. The software utilizes an OpenFileDialog control of Visual basic 2008 to prompt the user for the files path. It allowed the user to choose which text file to open in the program. The OpenFileDialog control contains the Filter property which was used to control the type of file to be opened in the program. The only extension allowed was the *.txt. The ShowDialog() method was used to display the Open Coordinate File dialog box on the screen. The FileName property was used to get the path specified by the user. The dialog box is shown in figure 3.1.1 Figure 3.1.1 Open Coordinate File dialog box After getting the path from the user, the program used a FileOpen() function to open the file specified by the user. The end of file function, EOF() was used to iterate through the file until the no more coordinates are left. The LineInput() function was used get a line of coordinates into a string variable. This string variable was then extracted to get the X, Y and Z coordinates in a separate array. The array containing the X, Y and Z coordinate was then used later to generate two dimensional previews and to send to the CNC milling machine. Finally the FileClose() function closes the text file. 3.2 Tool Path Preview The graphical user interface that is designed also contains a two dimensional preview feature which can be used to preview the path taken by the milling tool on the workpiece. The GUI uses the system.drawing.graphics namespace to create tool path. The preview panel, as shown in figure 3.2.1, gives a two dimensional (X, Y) preview of the tool path which will be followed by the cutting tool. It is also to check and verify that the input text file does not contain errors. A Preview command button is used to generate preview. This is activated only when a valid coordinate file is loaded. The GUI utilizes system.drawing namespace which includes system.drawing.graphics class to draw the preview. The DrawLines() method was used to draw a series of lines according to the X and Y coordinates in the coordinate file. Figure 3.2.1 Tool Path Preview control The use of three-dimensional absolute coordinate system has made the previewing algorithm much easier since the preview is two dimensional (X, Y), the program utilizes these X and the Y coordinates to draw a preview of the shape in the preview panel. Once the Preview command button is clicked, the btnPreview_Click event procedure gets the array containing the X and Y coordinates which was previously read from the text file. The procedure then used these coordinates as points to draw a series of lines using the DrawLines() method. Since absolute coordinates are used, the lines connect from the end point of the first X, Y coordinate to the start point of the next X, Y coordinate. In this way the path taken by the cutter is drawn by connecting the series of points. 3.3 Milling Controls The GUI on the main form contained a group box with a number of command buttons for commanding the milling machine. The Home command button was used to command the milling machine to rapidly move to its home position. Figure 3.3.1 Milling Control panel The advantage of using a software interface to control the CNC Milling Machine is that it acts like a control panel of the CNC which resides on the PC. Several command buttons have been used on the main form to command the CNC Milling Machine to carry out various tasks. The Home command button is used to command the CNC Milling Machine to move to its home position. The milling control also contains a command button Start to run or to send the coordinates to the milling machine to start milling. The flowchart in figure 3.3.2 shows this. Figure 3.3.2 Flowchart showing the start subroutine 4. COMMUNICATIONS The user interface for controlling the milling machine resides on a dedicated PC. Therefore there should be some means of communication between the software and the electronics hardware. A standard desktop personal computer consists of several communications ports. These include parallel port (LPT1), serial port (COM), PS/2 ports and Universal Serial Bus (USB) ports. Serial port communications has been used to with the electronics hardware. The Serial port or RS232 has several port settings that need to be set. The advantage of this obsolete technology is that it best suits the application we are designing, and the amount of data that needs to be sent to and from the milling machine. Figure 4.1 shows the dialog box that appears to the user when the user chooses Serial Port from the Setup Menu. On this dialogue box the user can choose the port settings. The reason for including this control is so that the application may work on different PCs. The default port setting is shown in figure 4.1. Figure 4.1 Serial Port Configuration dialog box The communications via RS232 was made possible using the system.IO.ports namespace, and the SerialPort class of Visual Basic 2008. The SerialPort class consisted of properties/attributes, methods and events which was used in the communication algorithm. The ReadExisting() method was used to read data from the PCs serial port receive buffer (Rx). The Write() method was used to send string data to the electronics of the CNC Milling Machine. The flowchart in figure 4.2 demonstrates how the communication to the milling machine is made when the user clicks ok on the dialog box in figure 4.1. Figure 4.2 Flowchart showing the communication algorithm followed. 5. TESTING AND DEBUGGING One problem faced during the development and testing of the GUI was run time errors or exceptions. Runtime errors or exceptions occur as a result of normal operating conditions [8]. For example errors when the GUI is trying to open a COM port which is being used by another program. The problem was overcome using structured error handling or the Try†¦Catch code block in Visual Basic. The GUI used message boxes to display appropriate messages to the users when an exception occurred and allowed the program to continue. The preview part of the GUI was tested by opening a text file containing 165 X, Y, Z points. These points resembled a circle in two dimensional (X, Y) planes. The result is depicted in Figure 5.1 which shows the tool path generated on the preview panel. Figure 5.1 Tool Path preview showing the preview of a circle Furthermore, the same file was used to mill a circle on softwood with the following settings: Feedrate 75mm/min Spindle Speed 2500RPM Cutting Tool Diameter 5mm The result is shown in Figure 5.2. The result shows that the Graphical User Interface made no errors while sequentially sending coordinates to the milling machine. Figure 5.2 Output of the CNC Milling Machine 6. CONCLUSION AND FUTURE WORK Based on the result in the previous section of this paper, it can be concluded that the GUI design was successful. The GUI was able to communicate with the electronics hardware of the CNC Milling Machine using RS232 serial link. The preview algorithm of the program also worked well. Finally the GUI was able to sequentially send (X, Y, and Z) coordinates representing cutter path in three dimensional space, to the CNC Milling machine. However, a number of tasks can be carried out in the future to improve the performance of the GUI and to enhance the output of the CNC Milling Machine. One such include the implementation of the industry standard G Codes which is based on ISO6983 data model, instead of X, Y, Z coordinate file. The G Code programming is a standardized way of controlling cutter motion. The CNC milling machine is capable of moving in steps as small as 1 tenth of a millimeter. Thus it is also recommended to improve the GUI so that it can cater for coordinates with one decimal point. The output of the CNC milling machine will improve drastically by having coordinates in mm to one decimal point. Another improvement that can be implemented on the GUI is using an abort button to cancel or abort the operations of the CNC Milling Machine. This is a standard safety feature which exists on most industrial machines including CNC machines.

Symbols of Feminine Power in Their Eyes Were Watching God Essay

Symbols of Feminine Power in Their Eyes Were Watching God  Ã‚     Ã‚  Ã‚   Much evidence supports Saturday Review writer Doris Grumbach's opinion that Their Eyes Were Watching God is "the finest black novel of its time" and "one of the finest of all time" (Washington, 4). Zora Neale Hurston's text is highly regarded because of the meaning and purpose it conveys using poetic language and folkloric imagery. It is the heroic story of Janie Crawford's search for individuality, self-realization, and independence from the patriarchal forces of her time. Because the novel is mainly concerned with Janie's many relationships within a male-dominated context, it is only logical to take feminist view of Their Eyes Were Watching God. Throughout my reading of this particular novel I have identified the images of porches, trees, and the horizon as symbols of power in favor of Janie Crawford's search for a feminist identity. To support this opinion, I have chosen to utilize the feminist / reader response theories formulated by Judith Fetterley in Introduction to the Resisting Reader: A Feminist Approach to American Fiction. Fetterley's writing is useful for the study of Their Eyes Were Watching God because of her discussion of power and its relation to women. In her introduction she explains the relationship between the two classifications of gender (male versus female) and the ideology of America. According to Fetterley, "American literature is male," and "to be American is male" (991). Unfortunately, this type of philosophy has existed for many years and still exists today. In order for a change to occurs, Fetterley says that readers must "examine American fictions in light of how attitudes toward women shape their form and content" because it... ...independence.    Works Cited Donlon, Jocelyn Hazelwood. "Porches: Stories: Power: Spatial and Racial Intersections in Faulkner and Hurston."Journal of American Culture (1996): 95-110. Online. Internet. 8 December 1999. Available: http:vweb.hwwilsonweb.com/cgi-bi†¦GT.&SP.URL.P=(H5Z7)J(0000121600)&. Fetterley, Judith. "Introduction to the Resisting Reader: a Feminist Approach to American Fiction." The Critical Tradition: Classic Texts and Contemporary Trends. Ed. David H. Richter. Boston: Bedford books, 1998. 991-998. Hurston, Zora Neale. Their Eyes Were Watching God. New York: Perennial Classics, 1990. Jacobs, Karen. "From 'Spy-glass' to Horizon: Tracking the Anthropological Gaze in Zora Neale Hurston." Novel (1997): 329-60. Online. Internet. 8 December 1999. Available: http:vweb.hwwilsonweb.com/cgi-bi†¦GT.&SP.URL.P=(H5Z7)J(00000121600)&.      

Creating a Credible Culture Essay

Nowadays if organization is willing to be successful and to respond quickly to changing demands, it should paid thorough attention to organizational cultures. Smart leaders and executives realize that greediness isn’t a bet of wealth and success as well as outward appearance of success shouldn’t be the substitute of achievement. Suzanne Bates claims that â€Å"when we allow spin to be used as a synonym of deception and when cutting ethical concern can pass for courage, leading the old-fashioned way somehow seems dreadfully dull†. (Bates 2003) Good name and respect of organization are rather vulnerable and, thus, organizational culture is of great importance. The most important thing for organization is the creating of atmosphere of trust. Place being respected for honesty and integrity is associated with good and skillful people working in it. (Bates 2003) Building credibility stars from the top and must be nurtured and cultivated constantly to achieve the desired outcomes. The first rule is to modify the behavior that will be promoted in future. If a company wants to perform honestly, it has to practice it from the very start. Therefore, employees should be thanked for honest feedbacks, even if feedback is a criticism. Bates recommends starting from building ethical culture, because leader always face ethical dilemmas and should be skillful enough to cope with competitive pressure. Actions should on the first place and only then words. For example, it is possible to set guiding rules for serving as ethical compass. The next moment is to lead by personal example and to improve communication process. (Bates 2003) Success is associated with honesty and sincerity. Organizational leaders spend lots of resources to maintain the outward appearance of success, though they lack the core principles of culture: honesty, openness, credibility and trustful policies. As Bates says, â€Å"a credible culture can be a magnet that draws people and talent to your organization†. (Bates 2003) Therefore, developing and motivating credible culture is a path to success. References Bates, Suzanne. (2003). Creating a Credible Culture. Nurse Leader, January-February, 37-38.

Battle of Queenston Heights in the War of 1812

Battle of Queenston Heights in the War of 1812 The Battle of Queenston Heights was fought October 13, 1812, during the War of 1812 (1812-1815) and was the first major land battle of the conflict. Seeking to cross the Niagara River, American troops under Major General Stephen van Rensselaer encountered a variety of difficulties. Finally landing part of his command, van Rensselaer engaged British forces under Major General Isaac Brock. In the resulting fighting, American troops suffered a defeat after militia forces refused to cross the river and a British counterattack isolated those on the Canadian side. The battle marked the end of a poorly managed campaign for the Americans. Fast Facts: Battle of Queenston Heights Conflict: War of 1812 (1812-1815)Dates: October 13, 1812Armies Commanders:United StatesMajor General Stephen van Rensselaer6,000 menGreat BritainMajor General Isaac BrockMajor General Roger Hale Sheaffe1,300 menCasualties:United States: 300 killed and wounded, 958 capturedGreat Britain: 14 killed, 77 wounded, and 21 missing. Native American casualties 5 killed and 9 wounded Background With the outbreak of the War of 1812 in June 1812, American forces began marshaling to invade Canada. Intending to strike at several points, the American efforts were soon put in jeopardy when Brigadier General William Hull surrendered Detroit to Major General Isaac Brock in August. Elsewhere, General Henry Dearborn remained idle at Albany, NY rather than move forward to capture Kingston while General Stephen van Rensselaer was stalled on the Niagara frontier due to a lack of men and supplies (Map). Major General Sir Isaac Brock. Photograph Source: Public Domain Returning to Niagara from his success at Detroit, Brock found that his superior, Lieutenant General Sir George Prevost had ordered British forces to adopt a defensive posture in the hopes that the conflict could be settled diplomatically. As a result, an armistice was in place along the Niagara which allowed van Rensselaer to receive reinforcements. A major general in the New York militia, van Rensselaer was a popular Federalist politician who had been appointed to command the American army for politic purposes. As such, several regular officers, such as Brigadier General Alexander Smyth, commanding at Buffalo, had issues with taking orders from him. Preparations With the end of the armistice on September 8, Van Rensselaer began making plans to cross the Niagara River from his base at Lewiston, NY to capture the village of Queenston and the nearby heights. To support this effort, Smyth was ordered to cross and attack Fort George. After receiving only silence from Smyth, van Rensselaer sent additional orders demanding that he bring his men to Lewiston for a combined assault on October 11. Major General Stephen van Rensselaer. Public Domain - National Gallery of Art Though van Rensselaer was ready to strike, severe weather led to the effort being postponed and Smyth returned to Buffalo with his men after being delayed en route. Having spotted this failed attempt and received reports that the Americans might attack, Brock issued orders for the local militias to begin forming. Outnumbered, the British commanders forces were also scattered along length of the Niagara frontier. With the weather clearing, van Rensselaer elected to make a second attempt on October 13. Efforts to add Smyths 1,700 men failed when he informed van Rensselaer that he could not arrive until the 14th. Opposing the American advance were two companies of British troops and two companies of York militia, as well as a third British company on the heights to the south. This last unit possessed an 18-pdr gun and a mortar which were located in a redan halfway up the heights. To the north, two guns were mounted at Vroomans Point. Around 4:00 AM, the first wave of boats moved across the river under the leadership of Colonel Solomon van Rensselaer (militia) and Lieutenant Colonel John Chrystie (regulars). Col. van Rensselaers boats landed first and the British soon raised the alarm. The British Respond Moving to block the American landings, British troops under Captain James Dennis opened fire. Col. van Rensselaer was quickly hit and put out of action. Captain John E. Wool of the 13th US Infantry took over and pushed into the village with the aid of American artillery firing from across the river. As the sun rose, British artillery began firing on the American boats with great effect. As a result, Chrystie was unable to get across as his boat crew panicked and returned to the New York shore. Other elements of Lieutenant Colonel John Fenwicks second wave were forced downstream where they were captured. At Fort George, Brock, concerned that the attack was diversion, dispatched a few detachments to Queenston and rode there to see the situation himself. In the village, American forces were contained in narrow strip along the river by the artillery fire from the redan. Though wounded, Col. van Rensselaer ordered Wool to take a force upstream, ascend the heights, and take the redan from behind. Arriving at the redan, Brock sent most of the troops guarding it down the slope to aid in village. As a result, when Wools men attacked, Brock was forced to flee and the Americans took control of the redan and its guns. Brock Killed Sending a message to Major General Roger Hale Sheaffe at Fort George, Brock requested reinforcements to block the American landings. Due to the redans commanding position, he immediately resolved to recapture it with those men on hand. Leading forward two companies of the 49th Regiment and two companies of York militia, Brock charged up the heights assisted by aide-de-camp Lieutenant Colonel John MacDonell. In the attack, Brock was struck in the chest and killed. Though outnumbered, MacDonell pressed the attack and pushed the Americans back to the edge of the heights. The British assault then faltered when MacDonell was hit. Losing momentum, the attack collapsed and the Americans forced them to fall back through Queenston to Durhams Farm, near Vroomans Point. Between 10:00 AM and 1:00 PM, Maj. Gen. van Rensselaer worked to consolidate the position on the Canadian side of the river. Ordering the heights to be fortified, he placed Lieutenant Colonel Winfield Scott in command with Brigadier General William Wadsworth leading the militia. Despite the success, Van Rensselaers position was tenuous as only around 1,000 men had crossed and few were in cohesive units. Disaster on the Heights Around 1:00 PM, reinforcements arrived from Fort George, including British artillery. Opening fire from the village, it made crossing the river hazardous. On the heights 300 Mohawks began attacking Scotts outposts. Across the river, the waiting American militia could hear their war cries and became reluctant to cross. Arriving on the scene around 2:00 PM, Sheaffe led his men on a circuitous route to the heights to shield them from the American guns. Frustrated, van Rensselaer re-crossed to Lewiston and worked tirelessly to convince the militia to embark. Unsuccessful, he dispatched a note to Scott and Wadsworth giving them permission to withdraw if the situation warranted. Abandoning their field works, they constructed a barricade at the top of the heights. Attacking at 4:00 PM, Sheaffe met with success. Hearing the Mohawk war cries and fearing massacre, Wadsworths men retreated and soon surrendered. His line collapsing, Scott fell back, ultimately retreating down the slope above the river. With no escape and the Mohawks, angry over the loss of two chiefs, in pursuit, Scott was forced to surrender the remnants of his command to Sheaffe. Following his surrender, around 500 American militia who had fled and hid emerged and were taken prisoner. Aftermath A disaster for the Americans, the Battle of Queenston Heights saw 300 killed and wounded, as well as 958 captured. British losses totaled 14 killed, 77 wounded, and 21 missing. Native American casualties 5 killed and 9 wounded. In the wake of the fighting, the two commanders agreed on truce to treat wounded. Defeated, van Rensselaer resigned and was replaced by Smyth who bungled two attempts at crossing the river near Fort Erie.

Joy

Joy JoyThroughout our journeys, we can expect the road of life to be paved with many experiences of both joys and sorrows drawn in. The joy that life brings creates a wonderful encounter with the world and all it's people. Joy is described as an especially intense period of happiness that results with contentment, pleasure, and delight. Although our life is a so-called "rollercoaster ride," and is filled with so many different dispositions or vibes, our joyful moments are the ones to be treasured and remembered forever. These moments are the ones that render a person to feel at the summit or highest point of the world and in humankind, but since life has so many different adventures and never occurs in the same fashion all the time, other temperaments are considered as well. Joy is a source or perhaps an object that grounds a feeling of enjoyment, cheerfulness, or satisfaction.Jeff Woloson in Thailand. The birds atop Jeff's he..."Their only child was their pride and joy."Joy can be illus trated by the passion or emotion that is energized by the gaining or anticipation of good. Joyful thoughts and manners are the pleasurable feelings or emotions caused by success, good fortune, and fondness, or by a normal prospect of possessing what we love or desire. Joy is gladness and indulgence as well as an exhilaration of a person's spirits.Many people have distinct sources that cause them happiness or joy as for it differs and fluctuates from person to person. Learning to live in the present moment is a part of the path to joy. As Shakespeare said, "Things won are done; joy's soul lies in the doing." Another great aspect of this quote that demonstrates the world's values (joys) and a real explanation of joy comes from a quote by Cesare Pavese, "The only joy...

Free Essays on Hypothetical

The first issue in the paper is that â€Å"several males who were seen on the streets wearing dark clothing, and who appeared to the officers to be suspicious looking were taken in to custody for questioning†. This issue raises the question; is the several males looking suspicious enough probable cause for the officers to make an arrest, does it violate the male’s rights of the fourth amendment? The fourth amendment states â€Å"the right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no warrants shall issue, but upon probable cause, supported by oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized† (Inciardi p. 188). An arrest may be made in two ways: with a warrant or without a warrant. In this case it was without a warrant. To make an arrest the officer must have probable cause and there are two ele ments to probable cause to arrest. The first is that a crime has been committed and the other is that the person to be arrested committed the offense (Stuckey, Roberson, Wallace p. 52). It is unclear to me if because the several males â€Å"looked suspicious† if this makes them a suspect of committing the crime. Another issue to address is that Mr. Troubleshooter was chased, apprehended by citizens, and then held to the ground for approximately fifteen minutes against his will. The first problem is that a private person arrest should be made when a crime has been committed, or attempted, in the presence of the arresting person (Stuckey, Roberson, Wallace p. 51). The arrest must be made upon more than a mere suspicion that a crime had been committed. In this case the citizens arrested Mr. Troubleshooter because of his reputation of being a drug dealer, and his â€Å"brisk walk† towards his apartment with what appeared to be a gun. Although Mr. Troubleshooter may have been w... Free Essays on Hypothetical Free Essays on Hypothetical The first issue in the paper is that â€Å"several males who were seen on the streets wearing dark clothing, and who appeared to the officers to be suspicious looking were taken in to custody for questioning†. This issue raises the question; is the several males looking suspicious enough probable cause for the officers to make an arrest, does it violate the male’s rights of the fourth amendment? The fourth amendment states â€Å"the right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no warrants shall issue, but upon probable cause, supported by oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized† (Inciardi p. 188). An arrest may be made in two ways: with a warrant or without a warrant. In this case it was without a warrant. To make an arrest the officer must have probable cause and there are two ele ments to probable cause to arrest. The first is that a crime has been committed and the other is that the person to be arrested committed the offense (Stuckey, Roberson, Wallace p. 52). It is unclear to me if because the several males â€Å"looked suspicious† if this makes them a suspect of committing the crime. Another issue to address is that Mr. Troubleshooter was chased, apprehended by citizens, and then held to the ground for approximately fifteen minutes against his will. The first problem is that a private person arrest should be made when a crime has been committed, or attempted, in the presence of the arresting person (Stuckey, Roberson, Wallace p. 51). The arrest must be made upon more than a mere suspicion that a crime had been committed. In this case the citizens arrested Mr. Troubleshooter because of his reputation of being a drug dealer, and his â€Å"brisk walk† towards his apartment with what appeared to be a gun. Although Mr. Troubleshooter may have been w...

Waterhouse Friderichsen Essay Example | Topics and Well Written Essays - 2250 words

Waterhouse Friderichsen - Essay Example To have a clear description of Waterhouse Friderichsen, a hypothetical client scenario will be used. Other than concentrating on the primary organ affected by Waterhouse Friderichsen, other organs affected by the same will also be discussed. The final section under this medical condition will focus on impacts of healthcare and nursing. The hypothetical case study will be of a 35 year old female patient who was found with signs and symptoms associated with Waterhouse Friderichsen. Majority of cases have been reported in children, but the increased rate of meningococcal infections have led to high incidences of Waterhouse Friderichsen in adults. In many cases, patients with Waterhouse Friderichsen die within 24hrs, but a few have managed to survive beyond 48hrs. Cases of full recovery have also been reported in some regions. This fact proves that the syndrome is not fatal when early diagnosis is made. Worldwide incidences of Waterhouse Friderichsen syndrome are not many, although cases of the condition go unnoticed in many instances (Manchanda et al, 2008). Case Analysis This is a hypothetical case of a 35 year old female patient who got admitted after showing signs of high grade fever accompanied by chills and vomiting over a period of 7days. The patient also had a skin rash on the abdomen and trunk, which appeared on the 5th day of infection. Following admission, the patient developed a hemorrhagic rash. On assessing the family history, there was no any significant information to associate the infection with family history. Medical examination revealed that the patient was unstable, and there was the presence of cyanosis. The patient was febrile with a pulse rate of 90/min and a systolic BP of 70mmHg. Neurological examination revealed positive signs of Kerning and Brudzinski. There were rashes all over the body but predominated on the abdomen and trunk. Collection of CSF was done under aseptic conditions and its processing done under standard bacteriological pr ocedures. Microscopy on CSF was done routinely, and a cell count of 9400/mm3 was reported. Of the total cell count, 86% were polymorphs while 14% were lymphocytes. An increase in CSF proteins to 309mg%, and a decrease in glucose to 20mg% were reported. A Gram stain preparation of the CSF revealed pus cells accompanied with gram-negative diplococcus. CSF cultures were done on MacConkey agar, chocolate agar, and blood agar and incubated overnight. After overnight incubation, there were tiny translucent colonies on blood agar and chocolate agar. Standard bacteriological procedures identified the tinny translucent colonies to be those of Neisseria meningitides. A CT scan conducted on the patient confirmed adrenal hemorrhage, which is present in Waterhouse Friderrichsen syndrome. Antibiotic sensitivity using 5 antibiotics showed no resistance to any of the antibiotics under examination. Antibiotics under examination were sulfamethoxazole, chloramphenicol, ceftriaxone, trimethoprim, and p enicillin. The patient was put on ceftriaxone and steroids but went into a shock. On the third day of admission, water Friderichsen syndrome was reported as the cause of death. Discussion Waterhouse Friderichsen syndrome was reported first in 1911 by Rubert Waterhouse. This syndrome is caused by failure of the adrenal gland due to massive bleeding into the gland. The cause of bleeding is a bacterial infection, most common bacteria being meningococcus Neisseria meningitides. This medical condition presentswith rash, fever, coagulopathy, rash, and shock. During the course of its development, multiple organs are affected, leading to multiple system failure. One significant sign in Waterhouse