scholarly journals A MATHEMATICAL SENSOR MODEL FOR INDOOR USE OF A MULTI-BEAM ROTATING 3D LIDAR

2019 ◽  
Vol XLII-2/W16 ◽  
pp. 227-234
Author(s):  
L. S. Tessema ◽  
R. Jaeger ◽  
U. Stilla
Keyword(s):  
Laser Beam ◽  
Geometric Interpretation ◽  
Distortion Correction ◽  
Conic Section ◽  
Sensor Model ◽  
Scan Line ◽  
Planar Maps ◽  
New Perspective ◽  
High Level ◽  
3D Lidar

<p><strong>Abstract.</strong> Our contribution presents a new perspective in the mathematical description of a rotating multi-beam LiDAR sensor, in a sense that we make use of projective geometry along with the “homogeneous general equation of the second degree” to parametrize scan lines. We describe the scan geometry of a typical multi-beam rotating 3D LiDAR by representing scan lines as pojective conics that represent a projective figure (a cone) in an embedding plane. This approach enables the parameterization of each scan line using a generic conic section equation. Most modeling approachs model spinning LiDAR sensors in terms of individual points sampled by a laser beam. On the contrary, we propose a model that provides a high-level geometric interpretation both for the environment and the laser scans. Possible application scenarios include exterior and interior calibration of multiple rotating multi-beam sensors, scan distortion correction and localization in planar maps.</p>

The roles of photochemical and non-photochemical quenching in regulating photosynthesis depend on the phases of fluctuating light conditions

2021 ◽  
Author(s):  
Jimei Han ◽  
Lianhong Gu ◽  
Jeffrey M Warren ◽  
Anirban Guha ◽  
David A Mclennan ◽  
...  
Keyword(s):  
Interactive Effects ◽  
Photochemical Quenching ◽  
Limiting Factor ◽  
Require Time ◽  
Photosynthetic Productivity ◽  
Fluctuating Environments ◽  
Precise Relationship ◽  
New Perspective ◽  
High Level ◽  
Non Photochemical Quenching

Abstract The induction and relaxation of photochemistry and non-photochemical quenching (NPQ) are not instantaneous and require time to respond to fluctuating environments. There is a lack of integrated understanding on how photochemistry and NPQ influence photosynthesis in fluctuating environments. We measured the induction and relaxation of chlorophyll a fluorescence and gas exchange in poplar and cotton at varying temperatures under saturating and fluctuating lights. When the light shifted from dark to high, the fraction of open reaction centers in photosystem II (qL) gradually increased while NPQ increased suddenly and then remained stable. Temperature significantly changed the response of qL but not that of NPQ during the dark to high light transition. Increased qL led to higher photosynthesis but their precise relationship was affected by NPQ and temperature. qL was significantly related to biochemical capacity. Thus, qL appears to be a strong indicator of the activation of carboxylase, leading to the similar dynamics between qL and photosynthesis. When the light shifted from high to low intensity, NPQ is still engaged at a high level, causing a stronger decline in photosynthesis. Our finding suggests that the dynamic effects of photochemistry and NPQ on photosynthesis depend on the phases of environmental fluctuations and interactive effects of light and temperature. Across the full spectra of light fluctuation, the slow induction of qL is a more important limiting factor than the slow relaxation of NPQ for photosynthesis in typical ranges of temperature for photosynthesis. The findings provided a new perspective to improve photosynthetic productivity with molecular biology under natural fluctuating environments.

scholarly journals Artificial General Intelligence: A New Perspective, with Application to Scientific Discovery

2019 ◽  
Author(s):  
A. M. Khalili
Keyword(s):  
Problem Solving ◽  
Scientific Discovery ◽  
General Intelligence ◽  
Discovery Process ◽  
Artificial General Intelligence ◽  
Alternative Perspective ◽  
New Knowledge ◽  
New Perspective ◽  
High Level ◽  
Open The Doors

The dream of building machines that have human-level intelligence has inspired scientists for decades. Remarkable advances have been made recently; however, we are still far from achieving this goal. In this paper, I propose an alternative perspective on how these machines might be built focusing on the scientific discovery process which represents one of our highest abilities that requires a high level of reasoning and remarkable problem-solving ability. By trying to replicate the procedures followed by many scientists, the basic idea of the proposed approach is to use a set of principles to solve problems and discover new knowledge. These principles are extracted from different historical examples of scientific discoveries. Building machines that fully incorporate these principles in an automated way might open the doors for many advancements.

scholarly journals A NEW PERSPECTIVE ON BRONCHIAL ASTHMA AND CHRONIC OBSTRUCTIVE PULMONARY DISEASE OVERLAP: POTENTIAL DIAGNOSTIC CRITERIA

2020 ◽  
Vol 73 (7) ◽  
pp. 1480-1483
Author(s):  
Tetyana O. Pertseva ◽  
Lyudmyla I. Konopkina ◽  
Alina O. Babenko
Keyword(s):  
Allergic Inflammation ◽  
Chronic Obstructive ◽  
Bronchial Obstruction ◽  
Obstructive Pulmonary Disease ◽  
Total Ige ◽  
Copd Patients ◽  
Group 2 ◽  
New Perspective ◽  
High Level ◽  
Blood Eosinophils

The aim: The aim of the research was to analyze the results of observation and examination of COPD patients in order to identify a group of individuals with potential asthma overlap. Materials and methods: We have conducted a two-stage dynamic investigation of 43 COPD patients during 3–8 years. The patients were divided into two groups: group 1 counted 30 individuals who presented with at least one episode of reversible bronchial obstruction (RBO) during the observation; group 2 – 13 individuals who presented with nonreversible bronchial obstruction (nonRBO). At the first stage, we conducted a clinical observations analysis and studied lung function examination records; at the second stage, we calculated the markers of allergic inflammation. Results: It was revealed that around 70% of COPD patients have occasional episodes of RBO. It was established that the level of blood eosinophils in these patients on the whole is rather low even in people with intermittent RBO, and the total IgE level appeared to be significantly higher in patients with intermittent RBO comparing to the level of this marker in patients who have nonRBO. Conclusions: COPD patients with intermittent RBO and high level of total IgE level form a group with potential asthma overlap.

Old walls, modern city: research on urban memory of disappearing ancient Beijing city walls

2016 ◽  
Vol 2 (1) ◽  
pp. 29-44 ◽  
Author(s):  
Fang Wang ◽  
Yaoyao Peng ◽  
Hsiao Chieh Wang ◽  
Fan Yin
Keyword(s):  
Urban Form ◽  
Life Experience ◽  
Beijing City ◽  
Content Type ◽  
Emotional Bonding ◽  
City Walls ◽  
New Perspective ◽  
Old City Renewal ◽  
High Level ◽  
With Memory

Purpose – Ancient city walls are typical linear space elements of Beijing that represent the transformation of urban form over the past 800 years and have greatly influenced the memory of the entire city. However, recently, most of the walls have been torn down in the process of fast urbanization and old city renewal. The purpose of this paper is to focus on people’s cognition and evaluation of urban memory during this pull-down-and-preserve process. Design/methodology/approach – A sample of 380 participants was investigated on a number of issues using questionnaires, including memory case reminders (stability, variability, temporality), emotional bonding with memory case (identity, dependence, authenticity), and socio-demographic variables (age, education, life experience, length of residence). The urban memory cognition model and attitude evaluation value model which were based on Likert scale were used to process the collected data. Findings – In the three aspects of memory case reminders, stability and temporary elements can be most cognized, whereas variability elements are more difficult due to their change over time. As for emotional bonding with memory case, people show a high level of identification with the walls; the walls’ memory being passed down could enhance people’s memory when mentioning Beijing. Further, higher education groups consider the walls’ authenticity to be most important and are unwilling to accept the outcome of walls-ruins parks; older adults have tolerant attitudes to the ruins parks. Originality/value – This study could not only contribute to the excavation of urban memory, but also strengthen citizens’ sense of identity and cohesiveness, thus shaping the spirit and culture of the city. Some findings could provide applicable guidelines for urban heritage protection and contribute a new perspective on the interrelationship between people and their physical surroundings.

Adaptation of CCIM Technology for HLW Treatment: Results of Research and Development

2010 ◽  
Author(s):  
Vladimir Lebedev ◽  
Sergey Stefanovsky ◽  
Alexander Kobelev ◽  
Fyodor Lifanov ◽  
Sergey Dmitriev
Keyword(s):  
High Level Waste ◽  
Cold Crucible ◽  
Savannah River ◽  
Treatment Results ◽  
Auxiliary Equipment ◽  
Automated Control ◽  
Automated Control System ◽  
New Perspective ◽  
High Level ◽  
River Site

Results of feasibility tests of application of Cold Crucible Inductive Melting (CCIM) technology to high level waste (HLW) treatment on examples of Savannah River Site, USA, and PA “Mayak”, Russia, HLW, carried out at SIA Radon, and results of design of new perspective bench-scale HLW vitrification facility are presented in this report. Full-scale low level waste (LLW) vitrification plant is under operation at Radon since 2003. Successful Radon experience aroused an interest to this technology from US DOE. Since 2001 Radon performed tests on vitrification of surrogates of various types of HLW stored at US DOE Sites. Process variables were determined and vitrified wastes were characterized in details. Since 2007 Radon was a subcontractor in the project on design and construction of a new CCIM based vitrification facility at PA “Mayak”. From preliminary tests on Mayak HLW surrogates the main technological features of CCIM process were determined and principles of the process control were formulated. Radon performed the design of the cold crucible and automated control system. On the base of analysis of previously and newly obtained data the main requirements to designing of cold crucible melters and auxiliary equipment, intended for actual HLW treatment, were worked out.

scholarly journals Assessment of the mapping potential of Pléiades stereo and triplet data

2014 ◽  
Vol II-3 ◽  
pp. 103-109 ◽  
Author(s):  
R. Perko ◽  
H. Raggam ◽  
K. Gutjahr ◽  
M. Schardt
Keyword(s):  
Large Scale ◽  
Optical Data ◽  
Model Optimization ◽  
Location Accuracy ◽  
Sensor Model ◽  
Forest Assessment ◽  
Stereo Data ◽  
Surface Models ◽  
High Level ◽  
Very High

The Pléiades satellites provide very high resolution optical data at a swath width of 20 km and a ground sampling distance of about 0.7 m at nadir direction. The sensors are remarkable agile as their pointing angle can be changed in a range of &plusmn;47 degrees. Thus, they are able to collect three images in one over flight representing tri-stereo data. In the presented work the mapping potential of Pléiades stereo and tri-stereo data is assessed in detail. The assessment is performed on two test sites and contains discussions on 2D initial geo-location accuracy, sensor model optimization, 3D geo-location accuracy, and a novel workflow for dense reconstruction of digital surface models (DSMs). The main outcomes are that the sensor accuracy is within the range as defined by Astrium, however a sensor model optimization is obligatory when it comes to highly accurate 3D mapping. The derived DSMs show a high level of detail thus enabling varying applications on a large scale, like change detection or forest assessment.

scholarly journals Identity Construction of Government Staff Interpreters in China —A Corpus-based Study of Shifts in Political Interpreting

2020 ◽  
Vol 1 (2) ◽  
pp. p77
Author(s):  
Cheng Zhan
Keyword(s):  
Identity Construction ◽  
Foreign Affairs ◽  
The Political ◽  
Second Person ◽  
Role Of Government ◽  
Facilitated Communication ◽  
Third Person ◽  
New Perspective ◽  
High Level

This paper presents the findings of a corpus-based empirical study on the role of government staff interpreters in the political context of China. Based on a qualitative analysis of discourse documented in authentic encounters between top leaders of Guangdong Province and their foreign visitors in interpreter-facilitated communication, the paper attempts to question the long-held view that government staff interpreters serve as a neutral, transparent non-person. To provide perhaps a new perspective from which the interpreter’s role may be revisited, this paper looks at personal angle shifts in the interpretation done by six staff interpreters of Guangdong Foreign Affairs Office, including shifts between first person and third person angles, and second person and third person angles. With what corpus data reveal, the paper argues that the interpreter’s role as a mediator is conspicuous even in high-level political interpreting. Rather than a transparent non-person, the interpreter constructs and represents her identity as well as the identity of the institution she belongs to by discursive means, and therefore acts as an active party of communication.

scholarly journals Using Relative Tie Strength to Identify Core Teams of Scientific Research

2019 ◽  
Vol 14 (23) ◽  
pp. 33
Author(s):  
Meishu Zhang ◽  
Yu Jia ◽  
Nianxin Wang ◽  
Shilun Ge
Keyword(s):  
Scientific Research ◽  
Absolute Threshold ◽  
Tie Strength ◽  
Threshold Method ◽  
Research Teams ◽  
Team Members ◽  
The Absolute ◽  
New Perspective ◽  
Cooperative Relationship ◽  
High Level

In China, it has long become imperative for the management of education and science and technology to build high-level scientific and technological innovation teams. Scientifically and accurately identifying core scientific research teams is an important condition for cultivating and building such teams. The absolute threshold method (e.g., c-level clique at, n- clique, k-core) is the prevailing means of identifying core teams and their core members. In fact, effects such as “the preference-dependent effect”, “the apostle effect” and “the star effect”, the cooperative relationship between the researchers is not even. This study, based on the co-authorship network, found that not choosing the absolute threshold properly can easily lead to poor identification of core members of some teams. Even worse, when the absolute threshold is too large, this “uniform” evaluation criterion of tie strength results in the elimination of some core teams in some disciplines. This paper uses relative tie strength to identify core scientific research teams from a new perspective, which can effectively avoid the situation of some core team members being ignored because of the mandatory requirements of the absolute tie strength among members, and can also solve the challenge of threshold selections for identifying different teams.

Banding Reduction in Electrophotographic Process Using Closed-Loop Controlled Piezoelectric Laser Beam Deflection Device

2000 ◽  
Author(s):  
Michael T. S. Ewe ◽  
George T.-C. Chiu ◽  
Jan P. Allebach ◽  
C. S. Chan ◽  
Wayne Foote
Keyword(s):  
Laser Beam ◽  
Closed Loop ◽  
Beam Deflection ◽  
Beam Position ◽  
Image Artifact ◽  
Loop Control ◽  
Positioning Errors ◽  
On Line ◽  
Scan Line ◽  
Identification Techniques

Abstract Banding is an image artifact that appears as peroidic light and dark bands across a page. This paper presents an experimental study on the application of a piezoelectric laser beam deflection device to reduce banding in the electrophotographic process. An empirical model was obtained using system identification techniques by measuring the laser beam position on-line using an optical sensor. A closed loop control strategy is then proposed and implemented. Experiments conducted without actually printing showed significant improvements in reducing the scan line positioning errors using the proposed method.

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