Conference Session

Track 4 - Session II - Student and Curriculum Development II

Collection

2013 ASEE International Forum

Authors

Megan Elizabeth Sharp, IUPUI School of Engineering and Technology; Alison L. Stevenson, Indiana University-Purdue University Indianapolis

Tagged Topics

Student and Curriculum Development

Paper ID #8289Creating A Global Solutions CurriculumMiss Megan Elizabeth Sharp, IUPUI School of Engineering and Technology Megan received her Bachelor of Arts in Political Science from Ball State University in 2007. The area of focus was International Studies, and the degree was accompanied by minors in International Resource Management and Peace Studies & Conflict Resolution. Following her undergraduate work, Megan at- tended Taylor University and earned a Masters of Environmental Science in 2009, following an overseas internship with the ACTS Group of Institutions in Bangalore, India. Megan’s academic and personal

Conference Session

Special Initiatives and Programs at Two-Year Colleges

Collection

2013 ASEE Annual Conference & Exposition

Authors

Farzin Heidari, Texas A&M University, Kingsville

Tagged Divisions

Two Year College Division

Paper ID #6082Micromachining: A New Trend in ManufacturingProf. Farzin Heidari, Texas A&M University, Kingsville Dr. Heidari currently serves as Associate Professor of industrial management and technology at Texas A&M University, Kingsville. Dr. Heidari has 23 years of experience in manufacturing and CAD/CAM/CNC courses. He is currently serving as the Graduate Coordinator for the Industrial Management program. Page 23.907.1 c American Society for Engineering Education, 2013

Conference Session

Assessment of Community Engagement

Collection

2013 ASEE Annual Conference & Exposition

Authors

Matthew J. Traum, Milwaukee School of Engineering; David A Howell, Milwaukee School of Engineering; Leah C. Newman, MSOE

Tagged Divisions

Community Engagement Division

Case for Servant Leadership, Westfield, IN: Greenleaf Center for ServantLeadership, 2008.[6] E. Tsang, J. Van Haneghan, B. Johnson, E. J. Newman, S. Van Eck, “A Report on Service-Learning and Engineering Design: Service-Learning’s Effect on Students Learning EngineeringDesign in ‘Introduction to Mechanical Engineering’,” International Journal of EngineeringEducation, Volume 17, Number 1, 2001, pp. 30-39.[7] D. Howell, “Yearly Report for: Suzanne and Richard Pieper Family Foundation, LTD.,”Milwaukee School of Engineering Office of Servant Leadership, December 21, 2012, url:http://www.srpieperfamilyfoundation.com/CharacterEducation.asp (accessed 4/1/2013

Conference Session

Capstone Design Courses and Tools in support of Systems Engineering Education

Collection

2013 ASEE Annual Conference & Exposition

Authors

Lisa Guerra, NASA Headquarters; Gloria A. Murphy, NASA; Lisa D. May, NASA Headquarters

Tagged Divisions

Systems Engineering

skills working with many engineering disciplines for testing vari- ous hardware and software interfaces between the U.S. and international elements on the Space Station. Her duties included extensive travel to Lyndon B. Johnson Space Center, Marshall Space Flight Center, Canada and Japan. Ms. Murphy joined the Launch Services Program in 2003 as an integration engineer for Pegasus and Taurus missions. In this position, she concentrated on the interfaces between the launch vehicle and the spacecraft. Ms. Murphy joined the Education Office in 2007 where she continues to serve as the project manager for the Lunabotics Mining Competition. Ms. Murphy earned a Bachelor of Arts degree in Psychology from the University of

Conference Session

Issues of Outreach and Interest in Engineering

Collection

2013 ASEE Annual Conference & Exposition

Authors

Mary R. Anderson-Rowland, Arizona State University; Armando A. Rodriguez, Arizona State University; Anita Grierson, Arizona State University

Tagged Divisions

Women in Engineering

seem particularly relevant to career development: (a) self-efficacy beliefs, (b)outcome expectations, and (c) goal representations.” Self-efficacy refers to “people’s judgmentsof their capabilities to organize and execute courses of action required to attain designated typesof performances.” 8, 9 These three authors further “define vocational interest as patterns of likes,dislikes, and indifferences regarding career-relevant activities and occupations.”10 Betz andHackett did a study on the relationship of career-related self-efficacy expectations to perceivedcareer options in college women and men.11 They found that females reported significantlyhigher levels of self-efficacy with regard to traditional female occupations and significantlylower

Collection

2013 GSW

Authors

Siamak (Sia) A. Ardekani

Extended Abstract with Poster Is Distance Education Distant Education? Siamak (Sia) A. Ardekani Civil Engineering Department The University of Texas at Arlington Extended AbstractDistance learning engineering course offerings are increasing in popularity among institutions ofhigher learning. These courses are often viewed as a cost-effective mechanism to deliverengineering education to worldwide student clients. As such, distance learning (DL) initiativessuch as the Massive Online Open Course (MOOC) offerings initiated

Collection

2013 Pacific Southwest Section Meeting

Authors

Kate Disney; Erik Dunmire; Michelle Millea; Larry Owens; Jo-Ann Panzardi P.E.; Liz Rozell

Engineering 1 Circuit Analysis 3 Introduction to Programming Concepts 3 and Methodologies for EngineersRequired Science Courses 13 Calculus-based Physics A (Mechanics) 4 Calculus-based Physics B (E & M) 4 General Chemistry with Lab 5Required Math Courses 15Calculus I 4Calculus II 4Multivariable Calculus 4Ordinary Differential Equations 3Total Units (minimum) 35 Proceedings of the 2013 American

Conference Session

Design Pedagogy and Curriculum 2

Collection

2013 ASEE Annual Conference & Exposition

Authors

Timothy F. Wheeler, Pennsylvania State University, University Park; Mary Lynn Brannon, Pennsylvania State University, University Park

Tagged Divisions

Design in Engineering Education

sequence. Close observation of the process oflearning will help the instructors understand how students are learning and identify bestteaching practices.3 A set of core questions (CQ) (see Appendix A) are asked identically ineach course in the sequence. Semester-specific questions (SSQ) target pre-existing knowledgeand the depth of gained knowledge gained in each course. Page 23.540.4The assessment tools for the pilot courses included:  Fall 2011, 200-level voluntary pilot course pre- and post-test surveys.  Spring 2012, 300-level pilot course, mid-semester evaluation and end of semester focus group (see Appendix B for focus group

Conference Session

Distance Education and Engineering Workforce Professional Development

Collection

2013 ASEE Annual Conference & Exposition

Authors

Kim A. Scalzo, State University of New York, HQ; Lisa Miles Raposo, State University of New York Center for Professional Development

Tagged Divisions

Continuing Professional Development

responsible for the final approval of the certificate and will be responsible for any updates or changes to the content – for example, this is usually the name of a formal CoP)B. Identify Target Audience for the Program (Who should enroll in this program?) 1.What are their titles? 2.In what types of organizations do they work? 3. What roles do they play in their organizations?C. Program Description 1. Rationale (Why is this certificate program needed and what functional responsibilities will be able to be supported if someone completes this program?) 2. Learning Outcomes to be Accomplished (What will people who complete the certificate program be able to do, including what

Conference Session

Beyond BS: Issues Affecting Graduate Education

Collection

2013 ASEE Annual Conference & Exposition

Authors

Zsuzsa Balogh, Metropolitan State University of Denver; Marvin E. Criswell P.E., Colorado State University; Michael A De Miranda, Colorado State University

Tagged Divisions

Civil Engineering

44 (50 including the added subtopics recommended by expert panel participants inRound 1 of the study) areas within the following five (plus one) general categories: A-BasicMechanics and Engineering Tools, B-General Structural Engineering Tools, C-Technology andCommunication Tools, D-Structural Engineering Topics and Tools, E-Management andProfessional Tools, F-Additional Topics. This paper describes the overall study and emphasizesthe competencies expected upon completion of the Masters-Level programs. Results specificallyaddressing the post-graduate and early experience period are presented in a companion paper.The results of the research provides very useful information to both the academic and practicingstructural engineering communities

Conference Session

Biomedical Engineering Poster Session

Collection

2013 ASEE Annual Conference & Exposition

Authors

Cheryl A Bodnar, University of Pittsburgh; Joan Frances Schanck, Pittsburgh Tissue Engineering Initiative, Inc.; Kalyani Raghavan, LRDC, University of Pittsburgh; Nathan Grant Smith, OpenArc LLC; Kurt Hess, Kurt Hess Illustration & Information Design; Brian Michael Buirge; Robert Melvin; Brian Hackett

Tagged Divisions

Biomedical

., Sherwin, A., Langer, R. Progress in the Tissue Engineering and Stem Cell Industry « Are we there yet? » Tissue Engineering Part B., 18(3), 155-166.4. NIH Database on Regenerative Medicine. http://stemcells.nih.gov/info/scireport/2006report.htm. Accessed November 28th, 2012.5. Wake Forest Institute for Regenerative Medicine (WFIRM). www.wfubmc.edu/WFIRM/. Accessed November 28th, 2012.6. California Institute for Regenerative Medicine. www.cirm.ca.gov. Accessed November 28th, 2012.7. McGowan Institute for Regenerative Medicine. www.mirm.pitt.edu. Accessed November 28th, 2012.8. National Science Foundation (2012). Science and Engineering Indicators Report. Chapter 7 Science and Technology: Public Attitudes and Understanding. www.nsf.gov

Conference Session

Civil Engineering Division Poster Session

Collection

2013 ASEE Annual Conference & Exposition

Authors

Monique H. Head, Morgan State University; Oludare Adegbola Owolabi PE, Morgan State University; Petronella A James-Okeke, Morgan State University

Tagged Divisions

Civil Engineering

Professor A's classoriginating from the R. C. Hibbeler's Engineering Mechanics: Statics text that is linked withMasteringEngineering®. Problem 6.7 Description: Determine the force in each member of the truss. Set P_1 = P_2 = P . (a) Determine the force in member AB. (b) Determine the force in member BC. (c) Determine the force in member BD. (d) Determine the force in member BE. (e) Determine the... Determine the force in each member of the truss. Set = = 2.9 . Page 23.308.4

Conference Session

Innovative IE Course Content

Collection

2013 ASEE Annual Conference & Exposition

Authors

Connie Gomez, Galveston College; Heidi A. Taboada, University of Texas, El Paso; Jose F. Espiritu, University of Texas, El Paso

Tagged Divisions

Engineering Economy, Engineering Management, Industrial Engineering

Paper ID #6509To Be Green Or Not To Be Green? Ethical Tools for Sustainability Engineer-ingDr. Connie Gomez, Galveston College Dr. Gomez received her Ph.D. in Mechanical Engineering from Drexel University in Philadelphia, PA. She has worked in the areas of Computer Aided Tissue Engineering and Sustainability at the University of Texas at El Paso. She is currently a member of Galveston College, developing a new Engineering Program.Dr. Heidi A. Taboada, University of Texas, El PasoDr. Jose F. Espiritu, University of Texas, El Paso

Conference Session

Mathematics Division Technical Session 3

Collection

2013 ASEE Annual Conference & Exposition

Authors

Kathleen A Harper, The Ohio State University; Gregory Richard Baker, Ohio State University; Deborah M. Grzybowski, The Ohio State University

Tagged Divisions

Mathematics

Paper ID #6988First Steps in Strengthening the Connections Between Mathematics and En-gineeringDr. Kathleen A Harper, The Ohio State University Kathleen A. Harper is a faculty lecturer in the Engineering Education Innovation Center at The Ohio State University. She received her M. S. in physics and B. S. in electrical engineering and applied physics from Case Western Reserve University, and her Ph. D. in physics from The Ohio State University. She has been on the staff of Ohio State’s University Center for the Advancement of Teaching, in addition to teaching in both the physics department and college of engineering. Her

Conference Session

Perspectives and Approaches to Teaching Simulation and Design-Based Courses

Collection

2013 ASEE Annual Conference & Exposition

Authors

David L. Silverstein, University of Kentucky; Lisa G. Bullard, North Carolina State University; Warren D. Seider, University of Pennsylvania; Margot A Vigeant, Bucknell University

Tagged Divisions

Chemical Engineering

A B C D E F G H I J K ABET Outcome  Figure 10. Respondents citing use of the capstone design sequence as part of their program’s ABET outcomesassessment process during 2011-12. Respondents indicated whether the outcome was assessed in their course, andthen were asked to identify outcomes which were assessed extensively in the course. Outcomes are: (a) an ability toapply knowledge of mathematics, science, and engineering, (b) an ability to design and conduct experiments, as wellas to analyze and

Conference Session

Programs in Support of Systems Engineering Education

Collection

2013 ASEE Annual Conference & Exposition

Authors

Saeed D. Foroudastan, Middle Tennessee State University; brigette elizabeth prater thompson, Middle Tennessee State University

Tagged Divisions

Systems Engineering

Paper ID #6524Engineering Management Creating Individuals with a Mind for Business anda Heart for EngineeringDr. Saeed D. Foroudastan, Middle Tennessee State University Saeed Foroudastan is the Associate Dean for the College of Basic and Applied Sciences (CBAS). The CBAS oversees 10 departments at Middle Tennessee State University. He is also the current Director for the Master’s of Science in Professional Science program and a professor of engineering technology at MTSU. Foroudastan received his B.S. in civil engineering, his M.S. in civil engineering, and his Ph.D. in mechanical engineering from Tennessee Technological

Conference Session

"How Do We Compare?" - Students, Case Studies, and Learning Approaches

Collection

2013 ASEE Annual Conference & Exposition

Authors

Christi P Patton Luks, University of Tulsa

Tagged Divisions

Chemical Engineering

Paper ID #6939Comparing a Modified Problem-Based Learning Approach To a TraditionalApproach to Teaching Heat TransferDr. Christi P Patton Luks, University of Tulsa Dr. Christi Patton Luks is an applied associate professor of Chemical Engineering at the University of Tulsa. Her degrees include a B.S. in Chemical Engineering from Texas A&M, a M.S. in Applied Mathematics from TU, and a Ph.D. in Chemical Engineering from TU. She is involved with AIChE and ASEE locally and nationally. Page 23.309.1

Conference Session

Materials Division Poster Session

Collection

2013 ASEE Annual Conference & Exposition

Authors

Peter R Hondred, Iowa State University; Denise Crawford, Iowa State University; Debbie Ann Victor, Des Moines Independent Schools; Michael R. Kessler, Iowa State University

Tagged Divisions

Materials

Paper ID #7640A MATERIALS ENGINEER’S APPROACH TO EXPLAINING SCIENTIFICPROBLEMS IN AN 8TH GRADE CLASSROOM: A CASE STUDYMr. Peter R Hondred, Iowa State University Peter R. Hondred is a graduate student in materials science and engineering at Iowa State University under the direction of Michael R. Kessler. He earned his B.S. in Engineering with a Mechanical emphasis as well as a minor in Chemistry from Dordt College in 2008. Hondred’s graduate research has involved the development of mathematical models that represent the thermal degradation of wire insulation polymers. Currently, he is working on biorenewable bases plastics

Conference Session

Capstone Projects, Design Projects, and Teamwork

Collection

2013 ASEE Annual Conference & Exposition

Authors

Tomas Enrique Estrada, Elizabethtown College

Tagged Divisions

Multidisciplinary Engineering

Paper ID #6306A Multidisciplinary Capstone Project Experience in a Small Liberal Arts Col-lege Setting: The Hybrid Solar TrackerDr. Tomas Enrique Estrada, Elizabethtown College Page 23.72.1 c American Society for Engineering Education, 2013 A Multidisciplinary Capstone Project Experience in a Small Liberal Arts College Setting: The Hybrid Solar TrackerAbstractOver the past two decades, the overall scope and expectations for capstone projects inundergraduate engineering project has evolved. There has been an increased

Conference Session

Reception & Poster Session

Collection

2013 ASEE International Forum

Authors

Steven Chingnam Goh, University of Southern Queensland

Tagged Topics

ASEE International Forum

Paper ID #8293A global accord for the postgraduate learning and professional developmentof engineers: A PropositionDr. Steven Chingnam Goh, University of Southern Queensland Dr Steven Goh completed his BEng in Manufacturing & Materials at UQ, MBA (Tech Mgt) at Deakin Uni, Master of Professional Accounting at USQ, Engineering Doctorate at USQ, and a Diploma in Com- pany Directorship from AICD. He joined USQ as an engineering academic staff in 2006 after spending over 10 years in industry in various roles including R&D Manager, Business Development Engineer to Managing Director of his own firm. He is currently active

Conference Session

ECE Curriculum Improvement

Collection

2013 ASEE Annual Conference & Exposition

Authors

JianJian Song, Rose-Hulman Institute of Technology; Deborah Walter, Rose-Hulman Institute of Technology; Edward Wheeler, Rose-Hulman Institute of Technology

Tagged Divisions

Electrical and Computer

Paper ID #7512Rationales on a Required Class on Signal and Power Integrity in a ComputerEngineering CurriculumDr. JianJian Song, Rose-Hulman Institute of Technology Jianjian Song (M’88, S’07) received his B.S. degree in radio engineering from Huazhong University of Science and Technology in Wuhan, China in 1982, and his M.S. and Ph.D. degrees in electrical engi- neering from the University of Minnesota in 1985 and 1991. He joined the Department of Electrical and Computer Engineering of Rose-Hulman Institute of Technology in Terre Haute, Indiana in 1999 as associate professor and he has been full professor since 2010. From

Collection

2013 Fall ASEE Middle Atlantic Section Conference

Authors

Gonca Altuger-Genc

DESIGN AND DEVELOPMENT OF A SELF-DIRECTED LEARNING COMPONENT FOR A MECHANICAL ENGINEERING TECHNOLOGY COURSE Gonca Altuger-Genc gencg@farmingdale.edu SUNY Farmingdale State College 2350 Broadhollow Road, Farmingdale, NY, 11735Abstract: ABET criterion 3.h for Baccalaureate Degree in EngineeringTechnology state that students have “an understanding of the need for and anability to engage in self-directed continuing professional development” uponcompletion of their program. In an effort to meet the ABET outcome and tointroduce students to self-directed learning, a semester project is developed to beimplemented in the senior level

Conference Session

NSF Grantees' Poster Session

Collection

2013 ASEE Annual Conference & Exposition

Authors

Mary R. Anderson-Rowland, Arizona State University; Armando A. Rodriguez, Arizona State University; Anita Grierson, Arizona State University; Richard A. Hall Jr., Cochise College; Phil Blake McBride, Eastern Arizona College; John H Bailey, Eastern Arizona College; Rakesh Pangasa, Arizona State University; Clark Vangilder, Central Arizona College; Russell Cox

Tagged Topics

NSF Grantees Poster Session

., Banks, D.L., and Mater, B., “METS Pilot Program: A Community College/University Collaboration to Recruit Underrepresented Minority Students into Engineering,” Proceedings of the 2004 American Society for Engineering Education Annual Conference, Salt Lake City, Utah, June 2004, 9 pages.11. Anderson-Rowland, M.R., and Grierson, A.E., “Collaborations with Non-Metropolitan Community Colleges,” Proceedings of the 2009 American Society for Engineering Education Annual Conference, Austin, TX, June 2009, 12 pages, CD-ROM and www.asee.org12. Anderson-Rowland, M.R., and Rodriguez, A.A., “Motivated Engineering Transfers – STEM Talent Expansion Program (METSTEP),” Proceedings of the 2010 American Society for Engineering

Conference Session

Statics - They can move at constant velocity!

Collection

2013 ASEE Annual Conference & Exposition

Authors

Janet Y Tsai, University of Colorado at Boulder; Daria A Kotys-Schwartz, University of Colorado Boulder; Michael Patrick Hannigan, University of Colorado - Boulder

Tagged Divisions

Mechanics

Page 23.856.6exception of the last problem, a 3-D robotic arm vs. a 3-D human arm. The illustrations and thefirst part of the problems are provided in Figure 2 below.   A) The  person  doing  push  ups  pauses  in  the  position   shown.  Her  m ass  is  65kg.  A ssume  that  the  weight  W   acts  at  the  point  shown.  The  dimensions  are   A) The  robotic  manipulator  is  stationary.  The   a=250mm,  b=740mm,  and  c=300mm.     weights  of  the  arms  AB  and  BC  act  at  their   1) Determine  the  normal  force

Conference Session

Embedded Systems and Mobile Computing

Collection

2013 ASEE Annual Conference & Exposition

Authors

Simin Hall, Virginia Tech; Clifford A. Shaffer, Virginia Tech; Eric Fouh, Virginia Tech; Mai Hassan ElShehaly, Virginia Tech; Daniel Breakiron, Virginia Tech

Tagged Divisions

Computing & Information Technology

(the post-test surveys were different for the two groups).Both sections received three weeks worth of instruction on sorting and hashing, and then bothsections took the identical test.The pre-survey from both groups measured a) students’ experience with online tools, content,and assessment, b) students’ perceptions of their learning in a face-to-face course compared withonline/Web-based instruction, c) students’ experience with using technology or e-textbook as itrelates to accomplishing course work, and d) students’ preference for lecture courses versuscourses given in a lab setting.The post survey from the treatment group measured students’ perception, enjoyment, and satis-faction with the OpenDSA modules, as well as their preference for

Conference Session

Grasping the "Concept"

Collection

2013 ASEE Annual Conference & Exposition

Authors

Katharyn E. K. Nottis, Bucknell University; Margot A Vigeant, Bucknell University; Michael J. Prince, Bucknell University; Ana Gabriela Aguilera Silva, Bucknell University

Tagged Divisions

Chemical Engineering

area, were provided to the participating professors at thebeginning of the semester along with homework and concept questions. Activities for ReactionRate versus Reaction Equilibrium were not available in the early part of this investigation sothose doing the activities initially were given eight activities. Two activities were designed forReversibility.Both activities designed for Reversibility involve computer simulations and are meant to clearlyshow that most realistic situations are irreversible. There is a Mixing Simulation and a PumpSimulation. Appendix B provides more details about these two inquiry-based activities.The participants completed an electronic version of the Concept Inventory for EngineeringThermodynamics (CIET) during the

Collection

2013 EDI

Authors

Stephen Fleming, Georgia Tech

Building aUniversity-Centered Regional Innovation Ecosystem Stephen Fleming Vice President @stephenfleming © 2013, Georgia Institute of Technology Role of the UniversityThree distinct stages of university evolution:Reference: Jan Youtie & Philip Shapira, Building an Innovation Hub: A Case Study ofthe Transformation of University Roles in Regional Technological and EconomicDevelopment, 20064/15/2013 Building a Regional Innovation Ecosystem 2 Role of the UniversityKnowledge storehouse4/15/2013 Building a Regional Innovation

Conference Session

Capstone Design and Innovations in ECE

Collection

2013 ASEE Annual Conference & Exposition

Authors

John J. Burke P.E., Western New England University

Tagged Divisions

Electrical and Computer

Paper ID #7765Introducing a Business Acumen into an Engineering CurriculumDr. John J. Burke P.E., Western New England University John Burke received the B.S.E.E. degree from Northeastern University in 1984, and the M.S.E.E. de- gree from University of California at Los Angeles in 1986, and the Ph.D. degree from the University of Massachusetts Amherst, in 1993. Dr. Burke joined the faculty of Western New England University (WNE) in 2000 and since 2004 he has been an assistant professor of electrical and computer engineering. Dr. Burke’s primary teaching inter- ests are Electromagnetics, Physics of Semiconductor Devices

Conference Session

CAD Assessments, Trends and Applications

Collection

2013 ASEE Annual Conference & Exposition

Authors

Jahangir Ansari, Virginia State University

Tagged Divisions

Engineering Design Graphics

Paper ID #7859Computer Aided Reverse Engineering of a Toy CarDr. Jahangir Ansari, Virginia State University Jahangir Ansari is Associate Professor of Manufacturing Engineering at Virginia State University. He received his M.S. degree in Mechanical Engineering in 1979 and Ph. D. degree in Mechanical Design and Production Engineering in 1983 both from Seoul National University. He joined the faculty at VSU in 2002. His research interests include Structural Vibration, FEM, CAD/CAM/CAE, and Virtual Manu- facturing. Page

Conference Session

iSTEM

Collection

2013 ASEE Annual Conference & Exposition

Authors

Laura Bottomley, North Carolina State University; Elizabeth A Parry, North Carolina State University

Tagged Divisions

K-12 & Pre-College Engineering

Paper ID #7327Creating a STEM School Using Engineering ConnectionsDr. Laura Bottomley, North Carolina State University Dr. Laura Bottomley received a B.S. in Electrical Engineering in 1984 and an M.S. in Electrical Engi- neering in 1985 from Virginia Tech. She received her Ph D. in Electrical and Computer Engineering from North Carolina State University in 1992. Dr. Bottomley worked at AT&T Bell Laboratories as a member of technical staff in Transmission Systems from 1985 to 1987, during which time she worked in ISDN standards, including representing Bell Labs on an ANSI standards committee for physical layer ISDN