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Chung Y.-H.,NTUST | Shih S.-Y.,NTUST
2017 International Symposium on VLSI Design, Automation and Test, VLSI-DAT 2017 | Year: 2017

This paper presents a 10-bit 100-MS/s SAR ADC incorporating a capacitor-swapping technique. The proposed swapping technique effectively removes the major capacitor-DAC transition error, resulting in improved linearity, without needing large capacitor size. To maintain good production yield, a dual-reference C-DAC is proposed to avoid using a tiny unit capacitance. The ADC was implemented in a 90-nm CMOS technology. At 100-MS/s, it consumes 1.25 mW from a 1-V supply. The measured peak SNDR and SFDR are 55.4 and 68 dB, respectively. Its ENOB is 8.91 bits, equivalent to a peak FoM of 26 fJ/conversion-step. © 2017 IEEE.


Chang S.-Y.,Graduate Institute of Management | Lu H.-P.,NTUST | Liang C.-J.,Graduate Institute of Finance
International Journal of Innovation Science | Year: 2013

The following teaching case study details an exciting and modern case of an integrated circuit distribution company in Taiwan (the Sunnic Group) as it transitions through several major innovation initiatives creating new products and a new role for itself in the industry while simultaneously fending off market forces, competition, and degrading profits. This case study delivers important lessons about conducting innovation via four major areas. The first area details how market forces, intense competitions, entry barriers, and corporate growth can create situations where innovating on a large scale has strong advantages over the alternatives. The second area shows how theories on innovation and customer value propositions are used to create realistic strategies for new products and feasible plans for organizational change. Topics like knowledge management, creating new capabilities, and key performance indicators are discussed. Next, the actual implementations of several innovation initiatives are explained in dramatic fashion with characters demonstrating resistance to innovation, competitor's reactions, and conflicts of interest; more importantly, it demonstrates how product development strategies can actually play out. This section also captures how transforming an organization can be stressful, leadership intensive, and difficult. Finally, the case reviews the results of the transformation and innovation efforts via the patent and financial results. This case is designed to teach students a mix of theory and practical skills. A lengthy list of questions for students is also provided and a teacher's edition from page 21 onwards of this text contains lecture notes that help in guiding class discussions and aid in creating assignments.


Liu Y.-H.,NTUST | Chen J.-H.,NTUST | Huang J.-W.,Green Energy and Environment Research Laboratory
Renewable and Sustainable Energy Reviews | Year: 2015

Partially shaded conditions (PSCs) often occur in large photovoltaic generation systems (PGSs). PSCs cause losses in system output power, hot spot effects, and system safety and reliability problems. When PSC occur, the PGS power-voltage characteristic curve exhibits multiple peak values; that is, the curve comprises a global maximum power point and multiple local maximum power points. Current literature includes various studies of global maximum power point tracking (GMPPT) algorithms and hardware architectures suitable for PSC; because the substantial quantity of PSC literature, this subject must be comprehensively reviewed. To focus on GMPPT techniques used in PSC, traditional maximum power point tracking techniques and circuit architectures that cannot distinguish GMPP and LMPP were not discussed. © 2014 Elsevier Ltd.


Lin S.-C.,NTUST | Wang I.-H.,NTU
IEEE International Symposium on Information Theory - Proceedings | Year: 2016

State-dependent broadcast channels (BC) with heterogeneous channel state information available at the transmitter (CSIT) are studied. The heterogeneity of CSIT lies in the timeliness of channel state that governs the link from the transmitter to different receivers - CSI of each link can be perfectly (causally or non-causally), delayed, or not available at the transmitter. We focus on the erasure BC and the bursty Gaussian BC, where the channel states are governed by memoryless Bernoulli processes, independent across users. For the erasure BC with perfect single-user CSIT, we characterize its capacity region regardless of the CSIT of the other user and show that this capacity region strictly contains that with no CSIT. For the case with delayed single-user CSIT, we propose an opportunistic network coding scheme that achieves a strictly larger rate region than the no-CSIT capacity region. These results are extended to the bursty Gaussian BC, where for the perfect single-user CSIT scenario, the capacity region is characterized to within a bounded gap; and for the delayed single-user CSIT scenario, a rate region based the opportunistic network coding scheme is derived. As a corollary, single-user CSIT is able to increase the sum degrees of freedom (DoF) for bursty Gaussian BC. Our result is in sharp contrast to the recent negative result by Davoodi and Jafar [1], where it is shown that for fast-fading MISO broadcast channel, single-user CSIT does not help at all in terms of sum DoF. © 2016 IEEE.


Lin S.-C.,NTUST | Wang I.-H.,NTU
IEEE International Symposium on Information Theory - Proceedings | Year: 2015

When multiple users share the same resource for physical layer cooperation such as relay terminals in their vicinities, this shared resource may not be always available for every user, and it is critical for transmitting terminals to know whether other users have access to that common resource in order to better utilize it. Failing to learn this critical piece of information may cause severe issues in the design of such cooperative systems. In this paper, we address this problem by investigating a two-pair two-way relay channel with an intermittently available relay. In the model, each pair of users need to exchange their messages within their own pair via the shared relay. The shared relay, however, is only intermittently available for the users to access. The accessing activities of different pairs of users are governed by independent Bernoulli random processes. Our main contribution is the characterization of the capacity region to within a bounded gap in a symmetric setting, for both delayed and instantaneous state information at transmitters. An interesting observation is that the bottleneck for information flow is the quality of state information (delayed or instantaneous) available at the relay, not those at the end users. To the best of our knowledge, our work is the first result regarding how the shared intermittent relay should cooperate with multiple pairs of users in such a two-way cooperative network. © 2015 IEEE.


Leu S.-S.,NTUST | Adi T.J.W.,NTUST
Expert Systems with Applications | Year: 2011

Microtunneling is a trenchless technology method used for installing new pipelines. The inherent advantages of this method over open-cut trenching have led to its increasing use. This paper presents a general model for microtunneling decision support system (MDS) that can be used as a basis for developing more effective microtunneling design and construction. The model objectives are to: (1) develop a description of local geology that reflects the uncertainty of the information on which it is based and (2) provide the input data necessary for other decision support systems. MDS is composed of two main modules: (1) geology prediction model (GPM) module which is based on Neural-Autoregressive Hidden Markov Model and (2) excavation method selection module to select appropriate excavation method based on GPM result. In order to validate the proposed model, a microtunneling project: Zhong-he drainage water tunnel in Taiwan, was used as a case study. The result shows that the MDS model achieves these objectives to a satisfactory degrese. © 2010 Elsevier Ltd. All rights reserved.


Lin Z.-C.,NTUST | Wang R.-Y.,NTUST
Computers, Materials and Continua | Year: 2010

The paper establishes a new three-dimensional quasi-steady molecular statics nanoscale abrasive cutting model to investigate the abrasive cutting behavior in the downpressing and abrasive cutting process of a workpiece in chemical mechanical polishing (CMP) process. The downpressing and abrasive cutting process is a continuous process. The abrasive cutting process is done after the single abrasive particle has downpressed and penetrated a workpiece to a certain depth of a workpiece. The paper analyzes the effects of the abrasive particles with different diameters on action force. It also analyzes the action force change of abrasive particles with different diameters on the projected area of unit contact face between abrasive particle and workpiece. The distribution of nanoscale equivalent stress and equivalent strain of the midsection of workpiece in abrasive cutting process are also analyzed. Furthermore, the special phenomena those are found in this paper, the one is the diameter of abrasive particle is greater, the action force on the projected area of its unit contact face is smaller and the other one is particular prominent regional action force in nanoscale abrasive cutting process. Besides, adopting the new molecular statics abrasive cutting model developed by the paper, the paper undergoes the simulation of same parameter conditions, and compares the simulation results with the related literature of using molecular dynamics method in order to prove that the new model developed by the paper is reasonable. Copyright © 2010 Tech Science Press.


Lu C.-H.,NTUST
2015 IEEE International Conference on Consumer Electronics - Taiwan, ICCE-TW 2015 | Year: 2015

An upcoming Internet-of-Tings (IoT) and machine-to-machine (M2M) era will introduce new paradigms for designing smart-living technologies. According to Gartner's latest forecast, smart home will be the most potential field for IoT-enabled applications. Due to the increasing concern on maintaining a sustainable earth, energy savings should leverage IoT related advances for realizing next generation energy savings for a context-aware smart home, where a smart socket is one key enabler. However, most of the current smart sockets work in a standalone way and its configuration stays fixed over time. By incorporating the M2M related advancement, we implement an M2M-enabled and reconfigurable smart socket (hereafter referred to as m2mSocket) which can dynamically changes its configuration by flexibly connecting to remote smart machines to provide attentive services. This way, the system can better fulfill users' needs in a dynamic and IoT-enabled home environment. © 2015 IEEE.


Chao C.K.,NTUST | Wikarta A.,NTUST
CMES - Computer Modeling in Engineering and Sciences | Year: 2012

An analytical solution to a three-phase composite with an eccentric circular inclusion under a remote uniform shear load is given in this work. Mode- III stress intensity factors for an arbitrarily oriented crack embedded in an infinite matrix or a core inclusion are provided in this paper. Based on the method of analytical continuation in conjunction with the alternating technique, the solution for a screw dislocation located either in the core inclusion or in the infinite matrix is first derived in a series form. The integral equations with logarithmic singular kernels for a line crack are established by using the screw dislocation solutions as the Green's function together with the principle superposition. The stress intensity factors, which can properly reflect the interaction between a crack and a non-uniformly coated circular inclusion, are then obtained numerically in terms of the values of the dislocation density functions of the integral equations. The effects of material property combinations and geometric parameters on the normalized mode-III stress intensity factors are discussed in detail and shown in graphic form. Copyright © 2012 Tech Science Press.


This paper uses quasi-steady molecular statics method to carry out simulation of nanoscale orthogonal cutting of single-crystal copper workpiece by the diamond tools with different edge shapes. Based on the simulation results, this paper analyzes the cutting force, equivalent stress and strain, and temperature field. For the three-dimensional quasi-steady molecular statics nanocutting model used by this paper, when the cutting tool moves on a workpiece, displacement of atoms is caused due to the effects of potential on each other. After a small distance that each atom moves is directly solved by the calculated trajectory of each atom, the concept of force balance is used. And Hooke-Jeeves direct search method is also used to solve the force balance equation, and obtain the new movement position. When chip formation and the size of cutting force during cutting are calculated, further analysis is made. After the position of an atom's deformation displacement is acquired, the shape function concept of finite element is employed to obtain the atomic-level equivalent strain. With the stress-strain curve obtained from experiment of the numerical tensile value of nanoscale copper film taken as the foundation, regression treatment is made, and then the flow stress-strain relational equation is acquired. The flow stress-strain curve is used to calculate the equivalent stress produced under equivalent strain of element. This paper further supposes that workpiece temperature is mainly produced from two heat sources: plastic deformation heat and friction heat. Thus, this paper uses the acquired equivalent stress and strain to calculate plastic deformation heat. Besides, this paper additionally develops a method to calculate the numerical value of friction heat produced by the workpiece atoms on the tool face and the numerical value of temperature rise of workpiece atoms on tool face. Finally, the temperature rise produced from the two heat sources is added up for calculation of temperature field of the cut single-crystal copper workpiece during nanoscale orthogonal cutting, and for making analysis. Copyright © 2012 Tech Science Press.

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