J.J. Lin

Publications (10)3.84 Total impact

• Source

  Available from: fie-conference.org

  Conference Proceeding: Work in progress - predicting retention in engineering using an expanded scale of affective characteristics from incoming students

  J.J. Lin, P.K. Imbrie, K.J. Reid
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  ABSTRACT: Earlier research published by the authors has demonstrated an improvement in prediction capability when incorporating nine affective characteristics into an artificial neural network retention model with eleven cognitive factors. Models developed previously have achieved moderate success with overall prediction accuracy above 70%. In this follow-up study, in order to develop new knowledge on relationships between other affective factors and student persistence, and further improve our capability to predict students' retention, five carefully selected affective characteristics are added to the existing retention model. These promising new affective factors are: goal orientation, implicit beliefs, intent to persist, social climate and self worth. New retention models based on logistic regression and neural networks are developed to identify the significant predictors among these new affective characteristics, and evaluate the overall predictive performance of new models incorporating them. The prediction accuracy results of models using only these new factors, as well as models including both new and existing factors are then compared with performance of previously published models. Upon completion of this project, confirmed significant predictors and their effects on predictive retention models will be reported. The potential engineering education applications based on these new findings will also be discussed.
  Frontiers in Education Conference, 2009. FIE '09. 39th IEEE; 11/2009
• Source

  Available from: Bernhard Dehlink

  Conference Proceeding: A multi-channel Rx for 76.5GHz automotive radar applications with 55dB IF channel-to-channel isolation

  S. Trotta, B. Dehlink, R. Reuter, Y. Yin, J. John, J. Kirchgessner, D. Morgan, P. Welch, J.J. Lin, B. Knappenberger, I. To, M. Huang
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  ABSTRACT: A multi-channel RX for automotive radar applications at 76.5 GHz is presented. The chip uses a LO input signal at 38.25 GHz which is multiplied on chip. The single-ended IF outputs show a noise density of -143 dBm/Hz at 100 kHz with a typical conversion gain of 18 dB. The large signal IF channel-to-channel isolation is > 55 dB. The 14 mm² chip consumes 520 mA from +3.3 V supply in a 200 GHz f_T SiGe BiCMOS process.
  Microwave Integrated Circuits Conference, 2009. EuMIC 2009. European; 10/2009
• Conference Proceeding: Progress toward a single chip radio in CMOS

  Kenneth K. O, S. Yu, C. Cao, J.-J. Lin, Y.-P. Ding, Z.-B. Li, M.-H. Hwang, S.-H. Hwang, L. Gao, A. Sugavanam, [......], D. Arenas, R. Bashirullah, J. Lin, R. Fox, D. Tanner, J. E. Brewer, D. Taubenheim, S. Machen, P. Gorday, F. Martin
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  ABSTRACT: • On-chip antenna pair gain at 24GHz is not optimal but sufficient for communication over 5 m near ground. 10-m range is possible if the antennas sit ∼ 50 cm above ground. • It should be possible to communicate to a UAV flying at 50–100m above the ground. • 24-GHz RF circuits with reasonable power consumption should be possible in 130-nm CMOS. It needs to be drastically reduced for unattended sensor applications. • The crystal reference frequency stability requirement has been relaxed such that use of an LC oscillator is possible. • Dual conversion architecture should enable integration of a transmitting antenna, PA and VCO on the same silicon substrate. • Power consumption reduction is the last remaining challenge. Lower frequency operation.
  Circuits and Systems Workshop: System-on-Chip - Design, Applications, Integration, and Software, 2008 IEEE Dallas; 11/2008
• Conference Proceeding: Effect of anode shapes on neutron emission from a repetitive plasma focus device

  F. Malik, S. M. Hassan, R. S. Rawat, M.V. Roshan, T. Zhang, S. Mahmood, J. J. Lin, T. L. Tan, P. Lee, H. Schmidt, S. V. Springham
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  ABSTRACT: The conventional tapered anode of the NX2 repetitive plasma focus device has been changed to two other shapes (straight and spherical) to investigate the effect of anode shape on neutron emission characteristics of the device. The newly designed beryllium counter and ³He proportional counter are used for estimation of neutron yield and time resolved neutron emission characteristics are measured using two PMT based plastic scintillator detectors located at different radial distances from the anode axis. It is found that the straight anode mostly produces multiple neutron peaks, the spherical anode on the other hand essentially has a single neutron peak in its signal while the tapered anode has a mixed behavior. It is found that there is no significant difference in the average neutron yield (typically of the order of 10⁷ neutrons per shot) for different anode shapes. However the pressure at which the maximum neutron yield occurs depends on the anode shape. The anode with spherical tip shows the most stable neutron emission with consistently good neutron yield over a much wider pressure range than the other anode shapes.
  Pulsed Power Conference, 2007 16th IEEE International; 07/2007
• Conference Proceeding: Shadowgraphic and euv emission studies of low energy miniature plasma focus device

  S. M. Hassan, R. S. Rawat, T. Zhang, S. Mahmood, J. J. Lin, F. Malik, S. V. Springham, T. L. Tan, P. Lee
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  ABSTRACT: A miniature plasma focus has recently been successfully developed at our Plasma Radiation Sources Lab. The system operates at low energy range of about 100 – 160 J (0.8 μF capacitor bank, 50 nH, 16 – 20 kV). In the present paper, we report the pinching evidence in this miniature plasma focus device using time resolved laser shadowgraphic techniques and time integrated optical imaging. For shadowgraphic purposes, a new but relatively simple detection system was developed using commercial Canon EOS 300D camera where the diagnostic laser and the miniature plasma focus were triggered by the camera itself. The use of this 6 Megapixel camera with its normal lens system not only provided the easy shadowgraphic system setup but also high resolution shadowgraphic images. The shadowgraphy and time integrated imaging were done for hydrogen as well as xenon seeded hydrogen gas miniature plasma focus operation. The enhancement in extreme ultra-violet radiation signal for xenon seeded hydrogen operation has been observed. The shadowgraphic images show that well defined current sheaths are formed at higher pressures of 10 mbar and above with good focusing evidence. The EUV emission however is low at these pressures. The operation of focus device at lower pressure though does not show focusing of current sheath but has much better EUV emission efficiency.
  Pulsed Power Conference, 2007 16th IEEE International; 07/2007
• Conference Proceeding: USE OF A NEURAL NETWORK MODEL AND NONCOGNITIVEMEASURES TO PREDICT STUDENT MATRICULATION IN ENGINEERING

  J.J. Lin, P.K. Imbrie, K.J. Reid, O.O. Oladunni
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  ABSTRACT: Engineering students’ affective self-beliefs prior to their first year have the potential to help researchers better understand various issues related to student retention and engagement. This paper examines whether a neural network model based on student noncognitive characteristics can be used to predict student persistence in engineering, and the influence of gender in the predictive model. Eight noncognitive measures (i.e., academic self-efficacy, academic motivation, leadership, metacognition, career, type of learner (e.g., deep vs. surface), teamwork, and expectancy-value) serve as independent parameters to an artificial neural network (NN) that is used to predict student persistence within engineering school at the end of first year. A feed-forward neural network model with back-propagation training was developed to predict third semester retention of a cohort of first-year engineering students (N=1,523) at a large Midwestern university. The model constituted of 159 primary nodes corresponding to 8 noncognitive factors described by a 159 item instrument. The resulting model was shown to have a predicative accuracy of 82% for retained students after their first year and 30% for non-retained students. Significantly decreasing the number of inputs (i.e., only using those items that appeared to have the strongest influence) had little impact on the predicative accuracy of the retained students. However, the reduction in inputs decreased the predictive accuracy of the non-retained students by approximately 10%. Results for the same cohort also indicate that the neural network prediction rate is independent of gender.
  2007 ASEE Annual Conference and Exposition, Honolulu, Hawaii; 06/2007
• Source

  Available from: Yung-Kang Kuo

  Article: Fabrication and low temperature thermoelectric properties of NaxCoO2 (x=0.68 and 0.75) epitaxial films by the reactive solid-phase epitaxy

  W. J. Chang, C. C. Hsieh, T. Y. Chung, S. Y. Hsu, K. H. Wu, T. M. Uen, J.-Y. Lin, J. J. Lin, C.-H. Hsu, Y. K. Kuo, H. L. Liu, M. H. Hsu, Y. S. Gou, J. Y. Juang
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  ABSTRACT: The authors have fabricated Na _x Co O ₂ thin films via lateral diffusion of sodium into Co ₃ O ₄ (111) epitaxial films (reactive solid-phase epitaxy [Ohta etal, Cryst. Growth Des. 5, 25 (2005)]). The environment of thermal diffusion is key to the control of the sodium content in thin films. From the results of x-ray diffraction and in-plane ρ_ab , the epitaxial growth and the sodium contents of these films were identified. The thermoelectric measurements show a large thermoelectric power similar to that observed in single crystals. The quasiparticle scattering rate is found to approach zero at low temperatures, consistent with the small residual resistivity, indicating high quality of the Na _x Co O ₂ thin films.
  Applied Physics Letters 03/2007; · 3.84 Impact Factor
• Source

  Available from: Sanghyun Hwang

  Conference Proceeding: Silicon Integrated Circuits Incorporating Antennas

  K.K. O, K. Kim, B. Floyd, J. Mehta, H. Yoon, C.-M. Hung, D. Bravo, T. Dickson, X. Guo, R. Li, [......], J.-J. Lin, Y. Su, C. Cao, M.-H. Hwang, Y.-P. Ding, Z. Li, S.-H. Hwang, H. Wu, S. Sankaran, N. Zhang
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  ABSTRACT: The feasibility of integrating antennas and required circuits to form wireless interconnects in foundry digital CMOS technologies has been demonstrated. The key challenges including the effects of metal structures associated with integrated circuits, heat removal, packaging, and interaction of transmitted and received signals with nearby circuits appear to be manageable. This technology can potentially be used for intra and inter-chip interconnection, and implementation of true single chip radios, beacons, radars, RFID tags and others, as well as contact-less high frequency testing
  Custom Integrated Circuits Conference, 2006. CICC '06. IEEE; 10/2006
• Source

  Available from: Sanghyun Hwang

  Conference Proceeding: The feasibility of on-chip interconnection using antennas

  K.K. O, K. Kim, B. Floyd, J. Mehta, H. Yoon, C.-M. Hung, D. Bravo, T. Dickson, X. Guo, R. Li, [......], A. Sugavanam, J.-J. Lin, S. Yu, C. Cao, M.-H. Hwang, Y.-R. Ding, S.-H. Hwang, H. Wu, N. Zhang, J.E. Brewer
  [show abstract] [hide abstract]
  ABSTRACT: The feasibility of integrating antennas and required circuits to form wireless interconnects in foundry digital CMOS technologies has been demonstrated. The key challenges including the effects of metal structures associated with integrated circuits, heat removal, packaging, and interaction of transmitted and received signals with nearby circuits appear to be manageable. Besides, on-chip interconnection, this technology can potentially be applied for implementation of true single chip radio and radar, interchip communication systems, RFID tags and others.
  Computer-Aided Design, 2005. ICCAD-2005. IEEE/ACM International Conference on; 12/2005
• Conference Proceeding: Back-end induced IMO layer charging

  L.M. Liu, K.M. Lin, S.L. Ying, C.H. Fang, M.H. Liaw, J.J. Lin, L.S. Tsai, S.L. Hsu, M.S. Lin
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  ABSTRACT: Field Inversion generated in a CMOS double metal process due to the back-end process was studied. Generated positive charges were related to reaction between PETEOS and noncarbon based SOG during alloying. Replacing PETEOS with Si-rich PETEOS or PEOXIDE eliminated the charging problems and improved yield
  VLSI Multilevel Interconnection Conference, 1991, Proceedings., Eighth International IEEE; 07/1991