Abstract:The nighttime outdoor lighting environment of healthcare buildings plays a crucial role in supporting patient recovery and overall physical and mental well-being.However,current lighting standards for medical facilities provide limited guidance,and practical design often lacks systematic attention to user experience and needs.This paper takes the Gansu Provincial Maternal and Child-Care Hospital project as a case study and adopts the Evidence-Based Design(EBD)approach to examine user-centered requirements throughout all stages of lighting design-from fixture selection and construction detailing to parameter settings and maintenance management.The study identifies four critical design dimensions essential for nighttime healthcare lighting environments:aesthetics appeal,wayfinding effectiveness,glare control,and appropriate brightness and color temperature.Through a subjective preference survey conducted at key lighting nodes,the study verified the effectiveness of several lighting design strategies,including emphasizing architectural fa çade coherence,adopting distant landscape lighting,and utilizing low-level roadway illumination.This research establishes a hospital outdoor lighting design process grounded in evidence-based design(EBD).This framework provides both practical reference and theoretical support for optimizing nighttime lighting environments in healthcare architectures and offers a reference for the development of relevant design standards.

Abstract:To effectively address the challenges of 3D human pose reconstruction in natural environments,this paper employs the MvPose matching mechanism to identify thesame targets across different views,and subsequently reconstruct multi-person 3D human poses.To achieve target tracking,an Extended Kalman Filter(EKF)is used,based on a variable-speed motion model,to predict the 3D human pose at the next moment.The predicted 3D human pose is then projected onto camera views,and the projected poses are associated with the targets identified by the matching mechanism.The Hungarian algorithm is used to obtain the optimal solution for target tracking.Furthermore,this paper proposes a method for reconstructing multi-person 3D human poses using feedback.Specifically,the pose tracker effectively fuses 2D human pose data to reconstruct 3D human poses.To improve the speed and accuracy of the 3D pose reconstruction,the epipolar RANSAC algorithm is used for robust estimation of matching point pairs to eliminate false matches.Subsequently,the final results are optimized using bundle adjustment.Experimental results show that while achieving 3D human pose tracking,the proposed feedback mechanism effectively reduces 3D pose reconstruction failures caused by multi-person interaction scenarios.

Abstract:In recent years,the quality of lighting environments in university gymnasiums has received widespread attention.Good lighting conditions not only enhance training effectiveness but also benefit students'health and improve the overall activity experience.However,existing design methods struggle to optimize both the architecture and lighting simultaneously,resulting in inconsistent training environment quality.Based on this,the study focuses on the integrated architectural and lighting design of training spaces in university gymnasium.It introduces a comprehensive evaluation method combining the Analytic Hierarchy Process(AHP)and Technique for Order Preference by Similarity to Ideal Solution(TOPSIS),using lighting quality-related parameters as indicators.By assigning weights and evaluating ideal and negative-ideal solutions,the study develops an optimal selection method for integrated lighting design schemes in university gymnasium training spaces.Practical and feasible integrated lighting design plans and strategies are proposed.The research results effectively improve the overall quality of lighting environments in university gymnasiums and provide a scientific basis and reference for the design and optimization of gymnasium lighting systems.

Abstract:The research on LED drive controllers featuring constant current drive for wide-range dimming to extend LED lifespan and high conversion efficiency is highly significant.This paper presents a high-efficiency LED drive controller based on the multifunctional average current type H 5118 chip,with STM32F107RCT6 as the core controller and in a dual-redundant CAN bus network form.Experimental results show that the output current is insensitive to input and output voltages,stable,with small ripple current,a conversion efficiency up to 98%,and a dimming depth reaching 0.1%.The dual-redundant CAN bus network enhances the controller's reliability.

Abstract:Observation of daylight climate is an important method to obtain region-specific data,which supports the development and utilization of local natural daylight resources.In this study,long-term field measurements were conducted in the Chongqing region to collect extensive light climate data over multiple years.The dataset includes global illuminance,vertical illuminance in various directions,sunshine duration,daylight spectrum,sky luminance distribution,and sky illuminance distribution.Focusing on the year 2020,this research provides a detailed analysis of the natural daylight illuminance characteristics specific to the Chongqing area.The results showed that the annual average global natural illuminance in the Chongqing area is 28 297 lx,with the average global illuminance between 9:00 and 15:00 reaching 35 379 lx.Natural illuminance shows a positive correlation with the solar altitude angle.The distribution of natural light resources throughout the year is highly uneven,exhibiting strong seasonality:summer＞spring＞autumn＞winter.During summer and spring,natural illuminance displays high variability,with the difference in maximum illuminance between two consecutive days or between adjacent hours exceeding 130 000 lx.Chongqing experiences a shortage of natural light resources,with the annual average duration of natural light exceeding the critical illuminance threshold being only 9.71 h.This duration is particularly low in autumn(8.17 h)and winter(7.61 h),significantly below the national average.The distribution of sky illuminance is closely related to sky types:under clear and intermediate skies,sky element illuminance decreases radially from the sun's position,whereas under overcast skies,the illuminance decreases radially from the zenith.This study has,to a certain extent,enriched the light climate database for the Chongqing region,providing data support for design and research related to natural light utilization in the area.

Abstract:In the process of urbanization,a large amount of underutilized"lost spaces"have emerged.With the rise of new media,these unique physical spaces are increasingly exposed to the public through online platforms,transforming into"urban spectacles"with the potential to become internet-famous landmarks.These spaces play a fundamental role in driving urban economic development.This article takes the space beneath Chongqing's riverside elevated roads as an case example,approaching it from the perspective of large-scale urban public art installations.It proposes using light art as a catalyst for urban"micro-renewal",transforming these underutilized spaces into nighttime art landmarks and enhancing the vibrancy of urban public spaces after dark.Furthermore,by leveraging Chongqing's broader tourism landscape,the study explores how the linear form of the elevated road space can connect scattered urban attractions,creating a unique nighttime city tour route.Through the viral influence of new media,this strategy aims to boost the local nighttime economy and promote regional development.

Abstract:In recent years,with the rapid development of LED display technology,LED screens have been widely used in commercial advertising,information dissemination and traffic management.Their high brightness has not only transformed the nighttime lighting environment of cities,but also brought a non-negligible impacts on urban traffic safety.To understand the impact of LED display brightness on drivers,the study conducted surveys and measurements on the placement,size and brightness of typical LED displays in the central urban areas of Chongqing.The results show that at night,the brightness of LED displays commonly exceeds the standard requirements of 400 cd/m2.Additionally,the high contrast between the display and the surrounding environment creates intense glare,which can easily distract drivers and poses a significant threat to nighttime driving safety.Therefore,it is recommended that the nighttime brightness of LED displays be reasonably controlled by referring to relevant standards and considering the ambient background luminance.This approach aims to ensure the visual effectiveness of the displays while also meeting driver's visual performance and comfort requirements.

Abstract:In the early stages of indoor lighting design,multiple iterations and rapid acquisition simulation results are often required.To support lighting design and address the problems of high computational load and long processing time associated with traditional indoor illuminance simulation tools,this paper proposes a fast prediction method for indoor illuminance distribution based on Conditional Generative Adversarial Networks(CGAN).First,high-precision workplane illuminance simulation were conducted on 2000 residential building samples using Honeybee to construct a training dataset.Furthermore,based on the Pix2pix algorithm,a corresponding deep learning network architecture was designed.After 200 epochs of training,the model successfully established a mapping from 2D lighting layout diagrams to indoor illuminance distribution maps.The result show that the model achieved a high prediction accuracy,with an average Structural Similarity Index(SSIM)of 0.974 and a Mean Absolute Error(MAE)of 0.014 on the test set.Compared with traditional numerical simulation methods,this approach provides millisecond-level performance feedback,greatly enhancing design efficiency.This study offers an efficient tool for rapid evaluation and optimization in indoor lighting design,contributing significantly to the advancement of green buildings and the enhancement of indoor environmental quality.

Abstract:At present,research on visual comfort evaluation in primary and secondary school classrooms in China is insufficient.Some studies have pointed out that using glare indices alone cannot reflect the issue effectively.This study plans to develop an targeted investigation and analysis based on the spacial forms,daylighting methods,and typical characteristics and patterns of students'viewing behaviors in classrooms,aiming to propose an effective visual comfort evaluation model.First,a questionnaire survey will be conducted to identify the main causes of students'visual discomfort.Second,based on the results of the survey,a test room experiment involving subjective evaluation will be designed to determine the most effective indicators and their standard values.Finally,a complete simulation-oriented visual comfort evaluation model for primary and secondary school classrooms will be proposed.The study found that disturbing reflected light within the blackboard area is the primary factor determining visual comfort in classrooms,and bright contrast(C)can effectively reflect the impact of such disturbing light.This study ultimately proposes evaluating visual comfort by analyzing the proportion of the blackboard area where the probability of high contrast(probability of C≥1.3)exceeds 75％.

Abstract:This study aims to improve the information recognition ability of occupants in armored vehicle cockpits under varying light environments.Using an armored vehicle with a windshield as the research subject,the study determines thecomfortable brightness of cockpit displays based on sky luminance distribution models and human visual comfort characteristics.By applying the method of minimum perceptual change,it was found that the display's comfortable brightness exhibits an exponential relationship with the logarithm value of external illuminance.The research results provide critical data support for the design of automatic dimming systems in armored vehicles.

Abstract:In the field of lighting,the selection of lamps based on lighting effects is increasingly gaining recognition in the industry.Uniformity data is a commonly used indicator for evaluating lighting performance.However,the traditional definition of uniformity,which only involves three measured values:minimum,average or maximum illuminance-is overly simplistic for assessing overall effect,and can be significantly biased in lighting scenarios with dark zones.This article analyzes and summarizes the three major types of uniformity evaluation indicators currently in use.Based on measured surface luminance data files,a comparative test was conducted on a 1-meter wall-washing lighting scenario.The results demonstrate that the linear uniformity indicator is the optimal choice for evaluating lighting performance.

Abstract:In oil painting exhibition at art museums,improper lighting environments can easily induce visual fatigue and diminish the overall visitor experience.To investigate the influence mechanism of color temperature and illuminance on viewing fatigue,this study established nine lighting conditions by combining three color temperatures(2 800 K,3 800 K,5 200 K)with three levels of illuminance(50 lx,150 lx,300 lx).Using a combination of electroencephalogram signal acquisition(Rθ,Rα indices)and subjective questionnaires,a comparative experiment was conducted with 32 participants.The results show that among the nine lighting conditions,the combination of 3 800 K color temperature and 150 lx illuminance performed the best in both subjective and objective indicators.This combination was most effective in reducing visual fatigue and enhancing the viewing experience,confirming the balancing effect of moderate lighting parameters between oil painting protection and visitor comfort.Furthermore,a lighting evaluation model integrating subjective and objective factors was constructed using the entropy weight method.Nonlinear regression analysis revealed a quantitative relationship between lighting parameters and visual comfort(R2=0.7541),providing theoretical support and parameter guidance for the adaptive regulation of dynamic lighting systems in intelligent art museums.

Abstract:This article aims to explore the decorative artistic characteristics of festival lantern landscapes during the Ming and Qing dynasties,focusing on their dual functions of lighting and visual enjoyment.Ancient Chinese festival lantern displays represent the pinnacle of traditional craftsmanship and artistic expression,distinguishing lantern culture as a unique facet of China's historical lighting culture.Compared to the Sui-Tang and Song-Yuan periods,festival lantern landscapes in the Ming and Qing dynasties exhibited greater diversity in decorative forms.They not only served practical lighting purposes but also incorporated artistic elements,reflecting the dual attributes of illumination and visual enjoyment.By reviewing historical documents and physical artifacts,this article outlines the new developments in festival lantern landscapes during the Ming and Qing periods.It focuses on analyzing the integration of decorative and functional elements in these lantern displays,highlighting their entertainment,practical,and ceremonial aspects.The study emphasizes how lantern viewing,functional lighting,landscape decoration,and ritual celebrations were brought together,embodying both material and spiritual dimensions of design culture.It reveals three core values of decorative artistic lighting in Ming and Qing festival lanterns:cultural heritage,a design approach rooted in humanistic and folk traditions,and the integration of spatial cultural scenes with ceremonial content.

Abstract:Urban road lighting systems have emerged as key targets for low-carbon infrastructure transition under the dual-carbon policy framework.Current research predominantly focuses on carbon emissions during the operational phase,while neglecting emissions associated with material manufacturing,construction,and maintenance phases,thereby leading to incomplete carbon footprint assessments.This study,grounded in ISO 14067 and Life Cycle Assessment(LCA)methodology,establishes a carbon emission accounting model encompassing raw material acquisition,product manufacturing,installation,and operational maintenance stages.Based on empirical data from six representative roads in Nanjing,the study identifies major carbon sources and influencing factors in urban lighting systems.A set of differentiated low-carbon strategies,such as intelligent control optimization,lamp parameter adjustment,and lighting layout redesign,is proposed and integrated into a"road-specific"emission reduction framework.Simulation results validate the effectiveness of the proposed approach.The findings provide a methodological foundation and technical support for the green upgrade of urban lighting systems,while also offering empirical evidence for policy-making,bidding evaluation reform,and sustainable lighting infrastructure development.

Abstract:How to design the in-vehicle lighting environment to improve passenger comfort has gradually become a key concern in the automotive industry.Based on a specific vehicle model,this study first identified existing issues in the current in-vehicle lighting environment through a subjective evaluation human factors experiment.In response to the most common issues identified,the research employed a combined subjective and objective research approach,investigating a total of 16 conditions formed by the combination of four ambient illumination levels and four display screen brightness levels at the second-row passenger area.Through subjective evaluation questionnaires and Landolt ring visual performance tests,the study obtained data on participants'perceived visual comfort and visual performance tests under different conditions.These findings provide a theoretical foundation and data support for the adaptive brightness design of headrest-mounted PAD displays.The conclusions contribute to improving the current nighttime in-vehicle lighting environment and offer a valuable reference for improving the lighting conditions in other seating positions within the vehicle.

Abstract:Intelligent lighting control is the cornerstone of green lighting .It is one of the indispensable core technologies of modern lighting .The article analyzes the development process of the lighting control technology over one hundred years , discusses the main lighting control network , and put forward the improvement and promotion plan .The article emphasizes that the lighting energy saving optimization is the core mission and propose the idea of road lighting control optimization based on the internet of things .The article presents a new concept of combining the intelligent control together with the solid -state light source , which will break through the traditional lighting methods , surpass the traditional lighting functions , and provide new thoughts for intelligent lighting research and development .

Abstract:With the development of technology,the research and application of light environment has expanded from vison to emotion,sleep,cognition,rhythm and many other aspects.Light and health has become new direction for the development of lighting.This paper reviews the history of healthy lighting research,analyses essential factors of human centric lighting;summarizes the photobiological safety problems and healing effects of light,puts forward the future direction of healthy lighting research,design and application and anticipates the frontier science of light health and the inevitable trend of evidence-based design.A comprehensive review of the current healthy lighting is made.