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(Source: IEEE Transactions on Biomedical Circuits and Systems)
Source: IEEE Transactions on Biomedical Circuits and Systems - September 30, 2009 Category: Biomedical Engineering Source Type: journals

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(Source: IEEE Transactions on Biomedical Circuits and Systems)
Source: IEEE Transactions on Biomedical Circuits and Systems - September 30, 2009 Category: Biomedical Engineering Source Type: journals

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(Source: IEEE Transactions on Biomedical Circuits and Systems)
Source: IEEE Transactions on Biomedical Circuits and Systems - September 30, 2009 Category: Biomedical Engineering Source Type: journals

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(Source: IEEE Transactions on Biomedical Circuits and Systems)
Source: IEEE Transactions on Biomedical Circuits and Systems - September 30, 2009 Category: Biomedical Engineering Source Type: journals

A Compact and Low-Cost MEMS Loudspeaker for Digital Hearing AidsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
A microelectromechanical-systems (MEMS)-based electromagnetically actuated loudspeaker to reduce form factor, cost, and power consumption, and increase energy efficiency in hearing-aid applications is presented. The MEMS loudspeaker has multilayer copper coils, an NiFe soft magnet on a thin polyimide diaphragm, and an NdFeB permanent magnet on the perimeter. The coil impedance is measured at 1.5 $Omega$, and the resonant frequency of the diaphragm is located far from the audio frequency range. The device is driven by a power-scalable, 0.25- $mu$m complementary metal–oxide semiconductor class-D $SigmaDelta$ amplifier...
Source: IEEE Transactions on Biomedical Circuits and Systems - September 30, 2009 Category: Biomedical Engineering Source Type: journals

Modeling and Optimization of Printed Spiral Coils in Air, Saline, and Muscle Tissue EnvironmentsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Printed spiral coils (PSCs) are viable candidates for near-field wireless power transmission to the next generation of high-performance neuroprosthetic devices with extreme size constraints, which will target intraocular and intracranial spaces. Optimizing the PSC geometries to maximize the power transfer efficiency of the wireless link is imperative to reduce the size of the external energy source, heating of the tissue, and interference with other devices. Implantable devices need to be hermetically sealed in biocompatible materials and placed in a conductive environment with high permittivity (tissue), which can affect ...
Source: IEEE Transactions on Biomedical Circuits and Systems - September 30, 2009 Category: Biomedical Engineering Source Type: journals

Code-Division-Multiplexed Electrical Impedance Tomography SpectroscopyEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Electrical impedance tomography uses multiple impedance measurements to image the internal conductivity of an object, such as the human body. Code-division multiplexing is proposed as a new method that can provide simultaneous impedance measurements of the multiple channels. Code division provides clear advantages of a wide frequency range at reduced cost and reduced complexity of sources. A potential drawback is the lack of perfectly orthogonal code sets. This caused an increase of 0.62% in root-mean-square spectral error when two codes were used to record two impedance channels simultaneously on a low-pass filter network...
Source: IEEE Transactions on Biomedical Circuits and Systems - September 30, 2009 Category: Biomedical Engineering Source Type: journals

Circuit and Coil Design for In-Vitro Magnetic Neural Stimulation SystemsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Magnetic stimulation of neural tissue is an attractive technology because neural excitation may be affected without requiring implantation of electrodes. Pulsed discharge circuits are typically implemented for clinical magnetic stimulation systems. However, pulsed discharge systems can confound in-vitro experimentation. As an alternative to pulsed discharge circuits, we present a circuit to deliver asymmetric current pulses for generation of the magnetic field. We scaled the system down by using ferrite cores for the excitation coil. The scaled system allows observation using electrophysiological techniques and preparation...
Source: IEEE Transactions on Biomedical Circuits and Systems - September 30, 2009 Category: Biomedical Engineering Source Type: journals

A Micropower Electrocardiogram AmplifierEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We introduce an electrocardiogram (EKG) preamplifier with a power consumption of 2.8 $mu$W, 8.1 $mu{rm V}_{rm rms}$ input-referred noise, and a common-mode rejection ratio of 90 dB. Compared to previously reported work, this amplifier represents a significant reduction in power with little compromise in signal quality. The improvement in performance may be attributed to many optimizations throughout the design including the use of subthreshold transistor operation to improve noise efficiency, gain-setting capacitors versus resistors, half-rail operation wherever possible, optimal power allocations among amplifier blocks, a...
Source: IEEE Transactions on Biomedical Circuits and Systems - September 30, 2009 Category: Biomedical Engineering Source Type: journals

Sensitivity-Enhanced CMOS Phase Luminometry System Using Xerogel-Based SensorsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We present the design and implementation of a phase luminometry sensor system with improved and tunable detection sensitivity achieved using a complementary metal-oxide semiconductor (CMOS) integrated circuit. We use sol-gel derived xerogel thin films as an immobilization media to house oxygen $({rm O} _{2})$ responsive luminescent molecules. The sensor operates on the principal of phase luminometry wherein a sinusoidal modulation signal is used to excite the luminophores encapsulated in the porous xerogel films and the corresponding phase shift of the emission signals is monitored. The phase shift is directly related to e...
Source: IEEE Transactions on Biomedical Circuits and Systems - September 30, 2009 Category: Biomedical Engineering Source Type: journals

CMOS Ultrasound Transceiver Chip for High-Resolution Ultrasonic Imaging SystemsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
The proposed CMOS ultrasound transceiver chip will enable the development of portable high resolution, high-frequency ultrasonic imaging systems. The transceiver chip is designed for close-coupled MEMS transducer arrays which operate with a 3.3-V power supply. In addition, a transmit digital beamforming system architecture is supported in this work. A prototype chip containing 16 receive and transmit channels with preamplifiers, Time-Gain compensation amplifiers, a multiplexed Analog-to-Digital converter with 3 kB of on-chip SRAM, and 50-MHz resolution time delayed excitation pulse generators has been fabricated. By utiliz...
Source: IEEE Transactions on Biomedical Circuits and Systems - September 30, 2009 Category: Biomedical Engineering Source Type: journals

A Low-Power High-Speed Ultra-Wideband Pulse Radio Transmission SystemEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We present a low-power high-speed ultra-wideband (UWB) transmitter with a wireless transmission test platform. The system is specifically designed for low-power high-speed wireless implantable biosensors. The integrated transmitter consists of a compact pulse generator and a modulator. The circuit is fabricated in the 0.5-$mu$m silicon-on-sapphire process and occupies $420 mu{hbox {m}}times 420 mu{hbox {m}}$ silicon area. The transmitter is capable of generating pulses with 1-ns width and the pulse rate can be controlled between 90 MHz and 270 MHz. We built a demonstration/testing system for the transmitter. The transmitte...
Source: IEEE Transactions on Biomedical Circuits and Systems - September 30, 2009 Category: Biomedical Engineering Source Type: journals

Studies of MEMS Acoustic Sensors as Implantable Microphones for Totally Implantable Hearing-Aid SystemsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
There is a need for high-quality implantable microphones for existing semiimplantable middle-ear hearing systems and cochlear prosthesis to make them totally implantable, thus overcoming discomfort, inconvenience, and social stigma. This paper summarizes and compares the results of an in-vitro study on three design approaches and the feasibility of using microelectromechanical system acoustic sensors as implantable microphones to convert the umbo vibration directly into a high-quality sound signal. The requirements of sensors were selected including the ability to withstand large body shocks or sudden changes of air pressu...
Source: IEEE Transactions on Biomedical Circuits and Systems - September 30, 2009 Category: Biomedical Engineering Source Type: journals

CMOS Baseline Tracking and Cancellation Instrumentation for Nanoparticle-Coated ChemiresistorsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Chemiresistor (CR) sensors and sensor arrays coated with thiolate-monolayer-protected gold nanoparticle (MPN) interfaces show great promise as detectors in gas-chromatographic microsystems with applications in biomedical and environmental analysis including breath biomarkers of disease. This paper describes a new readout circuit that overcomes the wide range of baseline resistances and drift in baseline values inherent to MPN-coated CRs to achieve a 57 ppm readout resolution. The 0.5-mum CMOS circuit operates at 5 V and provides a response resolution of 74 muV. It can cancel baseline voltages from 0.3 to 4.3 V with an accu...
Source: IEEE Transactions on Biomedical Circuits and Systems - September 30, 2009 Category: Biomedical Engineering Source Type: journals

Polarization-Analyzing CMOS Image Sensor With Monolithically Embedded Polarizer for Microchemistry SystemsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
This paper proposes and demonstrates a polarization-analyzing CMOS sensor based on image sensor architecture. The sensor was designed targeting applications for chiral analysis in a microchemistry system. The sensor features a monolithically embedded polarizer. Embedded polarizers with different angles were implemented to realize a real-time absolute measurement of the incident polarization angle. Although the pixel-level performance was confirmed to be limited, estimation schemes based on the variation of the polarizer angle provided a promising performance for real-time polarization measurements. An estimation scheme usi...
Source: IEEE Transactions on Biomedical Circuits and Systems - September 30, 2009 Category: Biomedical Engineering Source Type: journals

Guest EditorialEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
The four papers in this special issue were originally presented at the 2008 IEEE International Symposium on Circuits and Systems (ISCAS 2008), held on May 18-21, 2008, in Seattle, Washington. (Source: IEEE Transactions on Biomedical Circuits and Systems)
Source: IEEE Transactions on Biomedical Circuits and Systems - September 30, 2009 Category: Biomedical Engineering Source Type: journals

IEEE Transactions on Biomedical Circuits and Systems publication informationEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
(Source: IEEE Transactions on Biomedical Circuits and Systems)
Source: IEEE Transactions on Biomedical Circuits and Systems - September 30, 2009 Category: Biomedical Engineering Source Type: journals

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(Source: IEEE Transactions on Biomedical Circuits and Systems)
Source: IEEE Transactions on Biomedical Circuits and Systems - September 30, 2009 Category: Biomedical Engineering Source Type: journals

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Source: IEEE Transactions on Biomedical Circuits and Systems - July 28, 2009 Category: Biomedical Engineering Source Type: journals

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(Source: IEEE Transactions on Biomedical Circuits and Systems)
Source: IEEE Transactions on Biomedical Circuits and Systems - July 28, 2009 Category: Biomedical Engineering Source Type: journals

IEEE Transactions on Biomedical Circuits and Systems information for authorsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
(Source: IEEE Transactions on Biomedical Circuits and Systems)
Source: IEEE Transactions on Biomedical Circuits and Systems - July 28, 2009 Category: Biomedical Engineering Source Type: journals

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(Source: IEEE Transactions on Biomedical Circuits and Systems)
Source: IEEE Transactions on Biomedical Circuits and Systems - July 28, 2009 Category: Biomedical Engineering Source Type: journals

2010 IEEE International Symposium on Circuits and Systems (ISCAS2010)Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
(Source: IEEE Transactions on Biomedical Circuits and Systems)
Source: IEEE Transactions on Biomedical Circuits and Systems - July 28, 2009 Category: Biomedical Engineering Source Type: journals

Fault Modeling and Functional Test Methods for Digital Microfluidic BiochipsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Dependability is an important attribute for microfluidic biochips that are used for safety-critical applications, such as point-of-care health assessment, air-quality monitoring, and food-safety testing. Therefore, these devices must be adequately tested after manufacture and during bioassay operations. Known techniques for biochip testing are all function oblivious (i.e., while they can detect and locate defect sites on a microfluidic array, they cannot be used to ensure correct operation of functional units). In this paper, we introduce the concept of functional testing of microfluidic biochips. We address fundamental bi...
Source: IEEE Transactions on Biomedical Circuits and Systems - July 28, 2009 Category: Biomedical Engineering Source Type: journals

Sensor Layer of a Multiparameter Single-Point Integrated SystemEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We describe a multiple parameter medical sensor that is suitable for mounting on an active moving patient where mechanical flexibility, tight adhesion, lightweight, small size, and biocompatibility of an easily applied flat stick-on assembly at a single skin site are important considerations. Traditional microintegration technologies, such as system-in-package and system-on-chip, typically create lumped aggregations of components. In this paper, the flat architectural platform of a multiparameter sensor system is presented with microcircuitry distributed across multiple stacked layers that can be easily bent to fit body co...
Source: IEEE Transactions on Biomedical Circuits and Systems - July 28, 2009 Category: Biomedical Engineering Source Type: journals

QRS Detection Based on Multiscale Mathematical Morphology for Wearable ECG Devices in Body Area NetworksEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
A novel wearable electrocardiograph (ECG) QRS detection algorithm for wearable ECG devices in body area networks is presented in this paper, which utilizes the multistage multiscale mathematical morphology filtering to suppress the impulsive noise and uses the multiframe differential modulus accumulation to remove the baseline drift and enhance the signal. The proposed algorithm, verified with data from the MIT/BIH Arrhythmia Database and wearable ECG devices, achieves an average QRS detection rate of 99.61%, a sensitivity of 99.81%, and a positive prediction of 99.80%. It compares favorably to the published methods. (Sour...
Source: IEEE Transactions on Biomedical Circuits and Systems - July 28, 2009 Category: Biomedical Engineering Source Type: journals

Micro-Organism-on-Chip: Emerging Direct-Write CMOS-Based Platform for Biological ApplicationsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We describe the emerging applications of direct-write CMOS-based lab-on-chip which consists of capacitive sensors integrated with microfluidic structures. The microfluidic components are implemented through direct-write microfabrication process (DWFP) on a variety of substrates including integrated circuits. We put forward the recent advances of DWFP for different applications while our focus is placed on biological testing through a novel on-chip capacitive measurement method. We thereafter reveal the viability of this approach for biosensing purposes by demonstrating and discussing the experimental results on micro-organ...
Source: IEEE Transactions on Biomedical Circuits and Systems - July 28, 2009 Category: Biomedical Engineering Source Type: journals

Progress in Chip-Scale Photonic SensingEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Chip-scale integrated planar photonic sensing systems for portable diagnostics and monitoring are emerging, as photonic components are integrated into systems with silicon (Si), Si complementary metal–oxide semiconductor, and fluidics. This paper reviews progress in these areas. Medical and environmental applications, candidate photonic sensors, integration methodologies, integrated subsystem demonstrations, and challenges facing this emerging field are discussed in this paper. (Source: IEEE Transactions on Biomedical Circuits and Systems)
Source: IEEE Transactions on Biomedical Circuits and Systems - July 28, 2009 Category: Biomedical Engineering Source Type: journals

Microfluidic System for Controlled Gelation of a Thermally Reversible HydrogelEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
The integration of cell culture and characterization onto a miniaturized platform promises to benefit many applications such as tissue engineering, drug screening, and those involving small, precious cell populations. This paper presents the controlled on-chip gelation of a thermally-reversible hydrogel. Channel design and flowrate control are crucial in determining hydrogel geometry, while integrated temperature control triggers reversible gel formation. Formation of hydrogel droplets through shearing of immiscible flows is demonstrated with subsequent on-chip gelation. The temperature of phase transition occurs between 3...
Source: IEEE Transactions on Biomedical Circuits and Systems - July 28, 2009 Category: Biomedical Engineering Source Type: journals

Guest Editorial—Selected Papers from the IEEE International Mixed-Signals, Sensors, and Systems Test Workshop (IMS3TW), 2008Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
(Source: IEEE Transactions on Biomedical Circuits and Systems)
Source: IEEE Transactions on Biomedical Circuits and Systems - July 28, 2009 Category: Biomedical Engineering Source Type: journals

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(Source: IEEE Transactions on Biomedical Circuits and Systems)
Source: IEEE Transactions on Biomedical Circuits and Systems - July 28, 2009 Category: Biomedical Engineering Source Type: journals

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(Source: IEEE Transactions on Biomedical Circuits and Systems)
Source: IEEE Transactions on Biomedical Circuits and Systems - July 28, 2009 Category: Biomedical Engineering Source Type: journals

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Source: IEEE Transactions on Biomedical Circuits and Systems - June 1, 2009 Category: Biomedical Engineering Source Type: journals

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(Source: IEEE Transactions on Biomedical Circuits and Systems)
Source: IEEE Transactions on Biomedical Circuits and Systems - June 1, 2009 Category: Biomedical Engineering Source Type: journals

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(Source: IEEE Transactions on Biomedical Circuits and Systems)
Source: IEEE Transactions on Biomedical Circuits and Systems - June 1, 2009 Category: Biomedical Engineering Source Type: journals

The IEEE Digital LibraryEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
(Source: IEEE Transactions on Biomedical Circuits and Systems)
Source: IEEE Transactions on Biomedical Circuits and Systems - June 1, 2009 Category: Biomedical Engineering Source Type: journals

2010 IEEE International Symposium on Circuits and Systems (ISCAS2010)Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
(Source: IEEE Transactions on Biomedical Circuits and Systems)
Source: IEEE Transactions on Biomedical Circuits and Systems - June 1, 2009 Category: Biomedical Engineering Source Type: journals

Biomedical Circuits and Systems Conference (BiOCAS 2009)Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
(Source: IEEE Transactions on Biomedical Circuits and Systems)
Source: IEEE Transactions on Biomedical Circuits and Systems - June 1, 2009 Category: Biomedical Engineering Source Type: journals

A Remote Compact Sensor for the Real-Time Monitoring of Human Heartbeat and Respiration RateEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
A remote compact sensor system for the detection of human vital signs (heartbeat and respiration rate) is presented. The frequency band of 24 GHz is employed for remote sensing. For the compact size, the developed sensor uses a circularly polarized electromagnetic wave with a single antenna. The sensor system is composed of radio-frequency circuits, a signal conditioning block, a data-acquisition unit, and a signal-processing part. The peak detection of the power spectral density with a tracking algorithm is utilized for the real-time detection of human vital signs. The measurement result is compared with the commercial fi...
Source: IEEE Transactions on Biomedical Circuits and Systems - June 1, 2009 Category: Biomedical Engineering Source Type: journals

A Wireless-Implantable Microsystem for Continuous Blood Glucose MonitoringEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
A remotely powered implantable microsystem for continuous blood glucose monitoring is presented. The microsystem consists of a microfabricated glucose biosensor flip-chip bonded to a transponder chip. The transponder chip is inductively powered by an external reader with a 13.56-MHz carrier. It then measures the output signal of the glucose biosensor and transmits the measured data back to the external reader using load-shift keying (LSK). The microsystem has a volume of 32 mm$^{3}$ . The procedures for the microfabrication of the glucose sensor and the assembly of the microsystem are described along with the description o...
Source: IEEE Transactions on Biomedical Circuits and Systems - June 1, 2009 Category: Biomedical Engineering Source Type: journals

Amperometric Electrochemical Microsystem for a Miniaturized Protein Biosensor ArrayEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Protein-based bioelectrochemical interfaces offer great potential for rapid detection, continuous use, and miniaturized sensor arrays. This paper introduces a microsystem platform that enables multiple bioelectrochemical interfaces to be interrogated simultaneously by an onchip amperometric readout system. A post-complementary metal–oxide semiconductor (CMOS) fabrication procedure is described that permits the formation of planar electrode arrays and self assembly of biosensor interfaces on the electrodes. The onchip, 0.5-$mu$m CMOS readout electronics include a compact potentiostat that supports a very broad range ...
Source: IEEE Transactions on Biomedical Circuits and Systems - June 1, 2009 Category: Biomedical Engineering Source Type: journals

Factor Graph-Based Biomolecular Circuit Analysis for Designing Forward Error Correcting BiosensorsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We previously reported the fabrication and the verification of novel biomolecular transistors where electrical conductivity of a “polyaniline nanowires” channel is controlled by antigen-antibody interactions. In this paper, we present a simulation framework for analyzing the reliability of biosensor circuits constructed by using these biomolecular transistors. At the core of the proposed framework is a library of electrical circuit models that capture the stochastic interaction between biomolecules and their variability to environmental conditions and experimental protocols. Reliability analysis is then perfo...
Source: IEEE Transactions on Biomedical Circuits and Systems - June 1, 2009 Category: Biomedical Engineering Source Type: journals

Peptide Mass Fingerprinting Using Field-Programmable Gate ArraysEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
The reconfigurable computing paradigm, which exploits the flexibility and versatility of field-programmable gate arrays (FPGAs), has emerged as a powerful solution for speeding up time-critical algorithms. This paper describes a reconfigurable computing solution for processing raw mass spectrometric data generated by MALDI-TOF instruments. The hardware-implemented algorithms for denoising, baseline correction, peak identification, and deisotoping, running on a Xilinx Virtex-2 FPGA at 180 MHz, generate a mass fingerprint that is over 100 times faster than an equivalent algorithm written in C, running on a Dual 3-GHz Xeon se...
Source: IEEE Transactions on Biomedical Circuits and Systems - June 1, 2009 Category: Biomedical Engineering Source Type: journals

A Mixed-Signal Multichip Neural Recording Interface With Bandwidth ReductionEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We present a multichip structure assembled with a medical-grade stainless-steel microelectrode array intended for neural recordings from multiple channels. The design features a mixed-signal integrated circuit (IC) that handles conditioning, digitization, and time-division multiplexing of neural signals, and a digital IC that provides control, bandwidth reduction, and data communications for telemetry toward a remote host. Bandwidth reduction is achieved through action potential detection and complete capture of waveforms by means of onchip data buffering. The adopted architecture uses high parallelism and low-power buildi...
Source: IEEE Transactions on Biomedical Circuits and Systems - June 1, 2009 Category: Biomedical Engineering Source Type: journals

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(Source: IEEE Transactions on Biomedical Circuits and Systems)
Source: IEEE Transactions on Biomedical Circuits and Systems - June 1, 2009 Category: Biomedical Engineering Source Type: journals

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(Source: IEEE Transactions on Biomedical Circuits and Systems)
Source: IEEE Transactions on Biomedical Circuits and Systems - June 1, 2009 Category: Biomedical Engineering Source Type: journals

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Source: IEEE Transactions on Biomedical Circuits and Systems - April 3, 2009 Category: Biomedical Engineering Source Type: journals

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Source: IEEE Transactions on Biomedical Circuits and Systems - April 3, 2009 Category: Biomedical Engineering Source Type: journals

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(Source: IEEE Transactions on Biomedical Circuits and Systems)
Source: IEEE Transactions on Biomedical Circuits and Systems - April 3, 2009 Category: Biomedical Engineering Source Type: journals

IEEE Transactions on Biomedical Circuits and Systems information for authorsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
(Source: IEEE Transactions on Biomedical Circuits and Systems)
Source: IEEE Transactions on Biomedical Circuits and Systems - April 3, 2009 Category: Biomedical Engineering Source Type: journals