Study Guides (248,497)
SE 101 (2)
Quiz

# Quiz 2 Notes.docx

9 Pages
103 Views

School
Department
Software Engineering
Course
SE 101
Professor
Edgar Mateos
Semester
Fall

Description
SE101 Quiz 2 Notes October 25, 2012 Measurements, Units, and Measurement Error Terms  Measurement o Observed physical quantity o Two parts: 1. Numerical value 2. Reference standard consisting of a combination of units o Should be accurate and repeatable  Unit o Standard quantity used as a reference for measurements o Specific reference quantities used in measurements o Eg: Metres, feet, amperes, and newtons  Dimensions o Quantity measured o Eg: Distance, current, and force Unit Systems  Absolute o Use mass as a fundamental unit  Gravitational o Use force as a fundamental unit  Hybrid o Use both mass and force and fundamental units  Popular unit systems o SI (Systeme International d’Unites)  Commonly known as “International System of Units”  Absolute unit system  Seven base units  m  A  kg  mol  s  cd  K o FPS (Foot-Pound-Second)  Gravitational unit system  Widely used in NA  Include:  psi  in  mi  sec  ft  lb  Writing quantities with units o Number/formula – half/full space – SI unit symbols o 59.7u kg  Note: Italics for variables Symbol Unit Name Dimension m Metre Distance kg Kilograms Mass s Second Time K Kelvin Temperature A Ampere Current mol Mole Particle Count cd Candela Light Intensity Error  Systematic o Consistent deviation in a measurement o Also called BIAS or OFFSET o Same sign/magnitude o Types  Natural  Environmental effects  Instrument error  Improper calibration  Personal error  Habits of observer  Random o Small variations in measurements o May be positive or negative o No obvious bias  Average bias approaches 0 as more measurements are taken o Possible sources  Exerting different pressure when measuring with micrometer  Reading tape measure from different angles  Connecting instrument in slightly different fashion each time  Terms o Precision  Measure of repeatability of measurement  Small random error o Accuracy  Measure of closeness of all measurements to true value  Small random error and small systematic error  Small total error o Bias  Measure of closeness of average measurement to true value  Small systematic error Notations  Fixed o No exponents o Not always obvious if digits are significant o 30 140.0  Scientific o One non-zero digit to left of decimal 4 o 3.01400 x 10  Engineering o Exponent that is a multiple of 3 o Easier to covert to SI unit system magnitude prefixes o 30.1400 x 10 3  Absolute errors o 112.3 V ± 0.5V  Relative errors o 112.4 (1± 0.4%)V Professional Engineering Ethics Ethics  Modern Ethical Theories o Consequentialist o Deontological  Utilitarianism  Rights ethics  Jeremy  John Locke Bentham and  Duty ethics or John Stuart formalism Mill  Immanuel  Ethical egoism Kant  Nationalism o Other  Altruism  Virtue ethics  Aristotle  Existentialists  Feminist ethics  PEO Code of Ethics o PEO has responsibility for establishing, maintaining, and developing standards of professional ethics among members o Section 77 of Ontario Regulation 941 states PEO Code of Ethics  Enforced by law o Duties 1. General Duties Maintain high ideals of personal honour and professional integrity Perform professional engineering services with competence 2. Duty to Society  Regard practitioner’s duty to public welfare as paramount  Endeavor at all times to enhance public regard for practitioner’s profession 3. Duty to Employers  Keep trade secrets and protect confidential information  Disclose all conflicts of interest 4. Duty to Clients  Disclose any conflict of interest that may hinder rendering of services to client  Inform clients in writing of any limitations on practitioner’s services due tot practitioner’s status as employee 5. Duty to Colleagues  Co-operate with other professionals working on a project  Refuse to secretly review work of others  Give proper credit for work of others 6. Duty to Profession  Maintain honour of profession and report unprofessional, dishonest, or unethical conduct by any other practitioner  Ethics in the workplace o Professional behavior  Courtesy  Punctuality  Appropriate attire o Teamwork  Increasingly important due to complexity of projects  Teams can only be effective in absence of harassment and discrimination  Engineers should strive for higher standard of conduct than min set by law o Ethical problems  When in doubt, use PEO Code of Ethics  Ethical dilemmas are not easily solved  In case of conflicting duties, one must consider all possible alternatives and choose least undesirable o Resolving disputes  Differences of opinion are common  Best way to settle dispute is through courteous, direct communication  Formal complaints should only be filed once all possible informal resolutions have been exhausted Professionalism  Professional misconduct & discipline o Professional misconduct cases handled by PEO o ON Regulation 941 define…  What engineers SHOULD do: Section 77  What engineers SHOULDN’T do: Section 72 o Includes  Harassment  Negligence of duties  Failure to safeguard life/property  Failure to correct or report unsafe situations  Failure to comply with applicable codes  Sealing a drawing not prepared/checked by practitioner  Working in an area where practitioner lacks competence
More Less

Related notes for SE 101
Me

OR

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Join to view

OR

By registering, I agree to the Terms and Privacy Policies
Just a few more details

So we can recommend you notes for your school.