다중혈관 관상동맥 환자에서 y-문합을 이용하여 양쪽 내흉동맥만을 사용한 우회술의 조기 성적

“Unpaired Image-to-Image Translation using Cycle-Consistent Adversarial Networks”の学習報告

The diffraction tomography theorem is adapted to one-dimensional length measurement. The resulting spectral interferometry technique is described and the first length measurements using this technique on a model eye and on a human eye in vivo are presented.

Measurement of intraocular distances by backscattering spectral interferometry

Within the last several years, the field of terahertz science and technology has changed dramatically. Many new advances in the technology for generation, manipulation, and detection of terahertz radiation have revolutionized the field. Much of this interest has been inspired by the promise of valuable new applications for terahertz imaging and sensing. Among a long list of proposed uses, one finds compelling needs such as security screening and quality control, as well as whimsical notions such as counting the almonds in a bar of chocolate. This list has grown in parallel with the development of new technologies and new paradigms for imaging and sensing. Many of these proposed applications exploit the unique capabilities of terahertz radiation to penetrate common packaging materials and provide spectroscopic information about the materials within. Several of the techniques used for terahertz imaging have been borrowed from other, more well established fields such as x-ray computed tomography and synthetic aperture radar. Others have been developed exclusively for the terahertz field, and have no analogies in other portions of the spectrum. This review provides a comprehensive description of the various techniques which have been employed for terahertz image formation, as well as discussing numerous examples which illustrate the many exciting potential uses for these emerging technologies.

https://iopscience.iop.org/article/10.1088/0034-4885/70/8/R02/pdf

Imaging with terahertz radiation

Creating functional electrical circuits using individual or ensemble molecules, often termed as “molecular-scale electronics”, not only meets the increasing technical demands of the miniaturization of traditional Si-based electronic devices, but also provides an ideal window of exploring the intrinsic properties of materials at the molecular level. This Review covers the major advances with the most general applicability and emphasizes new insights into the development of efficient platform methodologies for building reliable molecular electronic devices with desired functionalities through the combination of programmed bottom-up self-assembly and sophisticated top-down device fabrication. First, we summarize a number of different approaches of forming molecular-scale junctions and discuss various experimental techniques for examining these nanoscale circuits in details. We then give a full introduction of characterization techniques and theoretical simulations for molecular electronics. Third, we highlig...

Molecular-Scale Electronics: From Concept to Function

A method that remotely measures blood oxygen saturation through two cameras under regular lighting is proposed and experimentally demonstrated. Two narrow-band filters with their visible wavelength of 660nm and 520nm are mounted to two cameras respectively, which are then used to capture two photoplethysmographic (PPG) from the subject simultaneously. The data gathered from this system, including both blood oxygen saturation and heart rate, is compared to the output of a traditional figure blood volume pulse (BVP) senor that was employed on the subject at the same time. Result of the comparison showed that the data from the new, non-contact system is consistent and comparable with the BVP senor. Compared to other camera-based measuring method, which requires additional close-up lighting, this new method is achievable under regular lighting condition, therefore more stable and easier to implement. This is the first demonstration of an accurate video-based method for non-contact oxygen saturation measurements by using ambient light with their respective visible wavelength of 660nm and 520nm which is free from interference of the light in other bands.

Non-contact detection of oxygen saturation based on visible light imaging device using ambient light.

Fast continuous terahertz wave imaging system for security

We proposed a one-dimensional convolutional neural network (CNN) model, which divides heart sound signals into normal and abnormal directly independent of ECG. The deep features of heart sounds were extracted by the denoising autoencoder (DAE) algorithm as the input feature of 1D CNN. The experimental results showed that the model using deep features has stronger anti-interference ability than using mel-frequency cepstral coefficients, and the proposed 1D CNN model has higher classification accuracy precision, higher F-score, and better classification ability than backpropagation neural network (BP) model. In addition, the improved 1D CNN has a classification accuracy rate of 99.01%.

/pdf/feature-extraction-and-classification-of-heart-sound-using-5fc24tlde0.pdf

Feature extraction and classification of heart sound using 1D convolutional neural networks

This note reports on the development of a novel cantilever-based focal plane array (FPA) for uncooled infrared (IR) imaging. The FPA of 160 × 120 pixels consisted of a 1 µm thick low stress SiNx structure layer, a thin gold reflection layer and a thick gold bimaterial layer. A bulk silicon process that includes silicon–glass anodic bonding and deep reactive ion etching techniques was developed selectively to remove the substrate silicon and form silicon frames for every FPA pixel. The thermomechanical sensitivity of the cantilever pixel was measured as 0.11 µm K−1, the noise-equivalent temperature difference of the FPA was theoretically estimated to be below 60 mK and the response time was calculated to be 15 ms. An optical readout system was used to measure deflections of all cantilevers in the FPA simultaneously, and thermal images of the human body were captured in good time. One of the unique advantages of this honeycomb-like FPA is the selective removal of the silicon substrate, which could increase the IR absorption efficiency by 48% compared with that fabricated by a traditional surface sacrificial layer process.

https://iopscience.iop.org/article/10.1088/0960-1317/18/5/057001/pdf

Design and fabrication of a high sensitivity focal plane array for uncooled IR imaging

We present a terahertz phase imaging method with multiwavelengths. This novel approach can image an object with a larger optical length compared with using the largest wavelength in the terahertz spectrum and does not involve the usual phase unwrapping in the detection of phase discontinuity. Furthermore, this technique can effectively reduce the noise background. We present two examples to demonstrate the validity of this new method. Both measurements show that multiwavelength phase imaging is a straightforward and efficient phase data processing method in terahertz imaging applications.

Xiaohua Liu

Papers

Non-contact detection of oxygen saturation based on visible light imaging device using ambient light.

Fast continuous terahertz wave imaging system for security

Feature extraction and classification of heart sound using 1D convolutional neural networks

Design and fabrication of a high sensitivity focal plane array for uncooled IR imaging

Terahertz multiwavelength phase imaging without 2π ambiguity