Daniel Shen - Academia.edu (original) (raw)

Papers by Daniel Shen

Information Sciences

Dynamic time warping (DTW) plays an important role in analytics on time series. Despite the large... more Dynamic time warping (DTW) plays an important role in analytics on time series. Despite the large body of research on speeding up univariate DTW, the method for multivariate DTW has not been improved much in the last two decades. The most popular algorithm used today is still the one developed seventeen years ago. This paper presents a solution that, as far as we know, for the first time consistently outperforms the classic multivariate DTW algorithm across dataset sizes, series lengths, data dimensions, temporal window sizes, and machines. The new solution, named TC-DTW, introduces Triangle Inequality and Point Clustering into the algorithm design on lower bound calculations for multivariate DTW. In experiments on DTW-based nearest neighbor finding, the new solution avoids as much as 98% (60% average) DTW distance calculations and yields as much as 25× (7.5× average) speedups.

The bridge crane demonstrates dynamics behavior that the flexible mode has a natural frequency de... more The bridge crane demonstrates dynamics behavior that the flexible mode has a natural frequency depending on the string length. In this project, a portable bridge crane is designed and made to demonstrate this dynamical phenomena by changing speed and string length. The portable bridge crane requires a light mass and a small size. At the same time, because it needs to be observed in a two-dimensional plane, the trolley must be able to move horizontally on a bridge with tracks, and the speed of the trolley needs to be controlled by a speed controllable motor. The crane needs to suspend a weight of 1 kg to demonstrate the change in natural frequency. The length of the rope needs to be adjustable. In addition, in order to ensure the stability of the instrument, it is necessary to reduce the impact force of the collision when the trolley hits the ends of the rail. Therefore, a soft stop is necessary to stop the motion of the cart before the collision at the end. In this way, the stabilit...

The purpose of this project is to provide insights on the Pupper Robot, from Hands-On Robotics (h... more The purpose of this project is to provide insights on the Pupper Robot, from Hands-On Robotics (handsonrobotics.org), for future studies and research. The Hands-On Robotics (HOR) team aims to provide robotics kits and educational curricula to explore agile locomotion, motor control, and AI for community colleges and high schools. We worked with the HOR team in this project to help them better achieve their goals. The main objectives of this project include: 1. Build the robot and analyze the dynamical behaviors of the robot. 2. Investigate the robot control from both hardware and software perspectives. 3. Design a new gait for the Pupper Robot. 4. Create an implementation guide for future groups, documenting knowledge we have learned during the project. By the end of this project, we achieved the following: A. Built a fully functioning robot. B. Investigated the theoretical underpinnings of quadruped robots, including inverse kinematics and gait generation theories. C. Understood and reflected on the control structure of the robot. D. Implemented a new jumping gait which allows the robot to leap forward and land on balance. E. Composed detailed guides on robot building instructions, controller files installation, simulator installation, and simulator modifications.

Journal of Vascular Anomalies, 2021

The buildings sector is responsible for approximately 23% of Australia's carbon emissions. Th... more The buildings sector is responsible for approximately 23% of Australia's carbon emissions. The Australian Sustainable Built Environment Council (ASBEC), the peak body for sustainability in the built environment, has identified that improving the minimum standards for energy efficiency of new buildings can assist in delivering carbon emissions reductions. One of the key tools in delivering improved building efficiency is the National Construction Code (NCC), which sets the minimum standards for new building work in Australia. The goal of the analysis undertaken for this project is to assess the contribution that the Code could make towards achieving GHG emissions reductions in line with overarching zero carbon targets.This report is the Final Technical Report for the Building Code Energy Performance Trajectory Project accompanying the Built to Perform report. The intent of this report is to provide more details on the underlying assumptions and results from the modelling work per...

Gland Surgery, 2021

In this article we review the literature on the inferior labial gland from a clinical and anatomi... more In this article we review the literature on the inferior labial gland from a clinical and anatomical perspective. Background: Regardless of its importance in clinical practice, there are no medical literature that comprehensively reviewed the inferior labial gland. Methods: A database search using PubMed and Google Scholar was conducted. The following keywords were used in the search: "lower labial salivary gland", "lower labial gland", "inferior labial salivary gland", AND "inferior labial gland". Conclusions: The human labial glands are types of minor salivary gland that continuously secrete small amounts of mucous and serous substances to maintain oral health. The inferior labial glands are innervated by the inferior labial branch of the mental nerve, and the inferior labial branch of the facial artery is the main arterial supply to the lower lip. Although they only have an auxiliary role in saliva production compared to the major salivary glands, minor salivary glands provide a certain amount of lubrication in the oral cavity by the continuous outflow of saliva. The inferior labial gland not only promotes moisturization in the oral cavity but also secretes substances with antibacterial effects, which is important for the function of the oral cavity. A recent study showed that the rate of salivary secretion from the inferior labial glands does not change with age, and in some cases the inferior labial glands are used for diagnosing intractable diseases such as Sjogren's syndrome and cystic fibrosis. In addition, since the inferior labial glands themselves can be the site of cyst and/or neoplasia development, we should be careful to distinguish them from other diseases. Elucidation of the anatomy, physiology, and pathology of the inferior labial glands, is important for understanding human health and diseases.

2017 International Conference on Electromagnetics in Advanced Applications (ICEAA), 2017

Measurements of the fine scale spectral distortion in the radio background spectrum below 200 MHz... more Measurements of the fine scale spectral distortion in the radio background spectrum below 200 MHz due to redshifted 21 cm radiation of the cosmological neutral hydrogen (referred to as red-shifted 21 cm signal hereafter) has achieved extraordinary importance in present day cosmology. Detection of this spectral distortion at long wavelength can provide the first radio constraints on the astrophysics that directed the thermal history of the Universe. Amplitude of these spectral distortions are, however, at least five orders of magnitude smaller than the mean brightness of the radio background at these wavelengths. This poses the highest measurement challenges at long wavelength radio astronomy and provides the motivation for innovating unique antenna and radio telescope systems. We present a qualitative discussion on the antenna system requirements for detecting the redshifted 21 cm spectral distortions.

Brigham Young University Prelaw Review, 2015

Scientific Reports, 2020

Synthetic biology is advancing into a new phase where real-world applications are emphasized. The... more Synthetic biology is advancing into a new phase where real-world applications are emphasized. There is hence an urgent need for mathematical modeling that can quantitatively describe the behaviors of genetic devices in natural, fluctuating environments. We utilize an integrative circuit-host modeling framework to examine the dynamics of a genetic switch and its host cell in varying environments. For both steady-state and transient cases, we find increasing nutrient reduces the bistability region of the phase space and eventually drives the switch from bistability to monostability. In response, cellular growth and proteome partitioning experience the same transition. Antibiotic perturbations cause the similar circuit and host responses as nutrient variations. However, one difference is the trend of growth rate, which augments with nutrient but declines with antibiotic levels. The framework provides a mechanistic scheme to account for both the dynamic and static characteristics of the...

is a powerful tool for pervasive computing, allow-ing people to easily tag objects so that a ubiq... more is a powerful tool for pervasive computing, allow-ing people to easily tag objects so that a ubiquitous computing infrastructure can identify and track them in the physical environment. RFID tagging’s com -mercial utility has been recognized in supply chain, logistics, and retail settings, and the trend is to increase RFID tagging of goods at the time of manufacturing.Ideas and prototypes for systems that use RFID-tagged items in a home setting abound. For example, the Magic Medicine Cabinet

TRABAJOS: PROYECTO: Pul.sa / AUTORES: Pilar Peralta y Bautista Mugnaini PROYECTO: Numo / AUTORES:... more TRABAJOS: PROYECTO: Pul.sa / AUTORES: Pilar Peralta y Bautista Mugnaini PROYECTO: Numo / AUTORES: Tamara Toledo y Ramiro Rios PROYECTO: Zenely / AUTORES: Sergio Olmedo y Manuel Reartes PROYECTO: Torretas de Ozono / AUTORES: Pedro Juan Delgado Bratti y Daniel Shen PROYECTO: ANCO / AUTORES: Belen Sol Quinteros y Bruno Mediavilla PROYECTO: Fructifero / AUTORES: Romina Escudero y Santiago Bognano PROYECTO: Acom / AUTORES: Ariadna Cevasco y M. Laura Gonzalez PROYECTO: NOZ / AUTORES: Camila Rapaline & Tomas Rodriguez Bravo

Anatomy & Cell Biology, 2021

The incisive branch of the inferior alveolar nerve is a vital anatomical structure within the ant... more The incisive branch of the inferior alveolar nerve is a vital anatomical structure within the anterior mandible that has not been thoroughly defined and outlined in reports in the literature until recent years. Advances in radiological imaging, particularly the widespread use of cone-beam computed tomography has allowed for accurate visualization of the mandibular incisive canal (MIC) and its associated incisive branch of the inferior alveolar nerve. Surgical damage to the MIC, which could result in hemorrhage and sensory disturbance, may occur in commonly practiced oral and maxillofacial procedures, such as chin bone harvesting, implant placement, fracture repair and removal of pathologic entities of the anterior mandible. Knowledge of both the presence, dimensions and location of the incisive branch is a vital component to pre and peri-operative planning of oral and maxillofacial surgeries performed within the mandible, particularly within the interforaminal zone. In this article, the terminology, anatomy, imaging, surgical consideration, and pathology of the incisive branch will be discussed.

Morphologie, 2021

During the routine dissection of a cadaveric specimen, the left mylohyoid muscle was found to be ... more During the routine dissection of a cadaveric specimen, the left mylohyoid muscle was found to be innervated by both the trigeminal and hypoglossal nerves. This variation was found unilaterally. To our knowledge this dual innervation of the mylohyoid muscle is an extremely rare variation. The possibility of these variants may lead to clinical consequences such as anesthesia failure and iatrogenic injury during surgical procedures in this region. We discuss this anatomical variation and possible developmental etiologies.

Anatomy & Cell Biology, 2020

There are many reported anatomical variations of the mandibular canal. Consequently, there is gre... more There are many reported anatomical variations of the mandibular canal. Consequently, there is great variation in the retromolar area, such as the quantity, size, and location of the retromolar foramen (RMF), the bony entrance of the retromolar canal (RMC). These variations allow for different accessory innervations to the mandibular molars and their adjacent buccal tissue because the RMC contains neurovascular bundles. Consideration of these anatomical variations is crucial for avoiding complications in anesthesia, implant placement, and surgery. However, the rarer canal types are often only imaged by computed tomography (CT) or cone beam computed tomography (CBCT). We present a rare case with bilateral RMF and a unilateral trifid mandibular canal in a cadaver.

Advanced Analytics and Learning on Temporal Data, 2020

We develop algorithms to automate discovery of stochastic dynamical system models from noisy, vec... more We develop algorithms to automate discovery of stochastic dynamical system models from noisy, vector-valued time series. By discovery, we mean learning both a nonlinear drift vector field and a diagonal diffusion matrix for an Itô stochastic differential equation in R d. We parameterize the vector field using tensor products of Hermite polynomials, enabling the model to capture highly nonlinear and/or coupled dynamics. We solve the resulting estimation problem using expectation maximization (EM). This involves two steps. We augment the data via diffusion bridge sampling, with the goal of producing time series observed at a higher frequency than the original data. With this augmented data, the resulting expected log likelihood maximization problem reduces to a least squares problem. We provide an open-source implementation of this algorithm. Through experiments on systems with dimensions one through eight, we show that this EM approach enables accurate estimation for multiple time series with possibly irregular observation times. We study how the EM method performs as a function of the amount of data augmentation, as well as the volume and noisiness of the data.

Japanese Journal of Applied Physics, 2017

View the article online for updates and enhancements. Related content N-type high-performance mul... more View the article online for updates and enhancements. Related content N-type high-performance multicrystalline and mono-like silicon wafers with lifetimes above 2 ms Sieu Pheng Phang, Hang Cheong Sio, Chia-Fu Yang et al.-N-type compensated silicon: resistivity, crystal growth, carrier lifetime, and relevant application for HIT solar cells Shuai Li, Wenxiu Gao, Zhen Li et al.-Rapid mitigation of carrier-induced degradation in commercial silicon solar cells

Society of Nuclear Medicine Annual Meeting Abstracts, May 1, 2008

Society of Nuclear Medicine Annual Meeting Abstracts, May 1, 2007