In a commercialized, fully artificial plant factory, artificial luminaire is arranged in a unified way using a general illumination theory, an actual measurement, or an empirical methodology. However, with these metho...In a commercialized, fully artificial plant factory, artificial luminaire is arranged in a unified way using a general illumination theory, an actual measurement, or an empirical methodology. However, with these methods, lightings are implemented without considering specific optical characteristics of lighting or material characteristics of each component that constructs a cultivation system, resulting in an amount of light that becomes irregular. The amount of lighting is closely related with the growth and quality of crops, and the deviation between points where cultivated crops are located causes quality difference in the produced crops, thus impairing the economic feasibility of a plant factory. In this regard, a simulation to figure out an optimum lighting layout was performed. Arrangements based on the spectrum distribution of light source and reflector materials were implemented to ascertain the distance between lighting and height of lighting and gather information in the pre-treatment process to improve the uniformity of light in the plant cultivation system. Improvement of around 15% in light uniformity is achieved compared with the existing system after the simulation is carried out. This result would reduce the deviation in crop growth to make uniform quality crop production possible.展开更多
We experimentally study the dynamic characteristics of a miniaturized spin-exchange relaxation-free(SERF) magnetometer based on uniform light field. The ceramic ferrule is used to expand the Gaussian beam to improve l...We experimentally study the dynamic characteristics of a miniaturized spin-exchange relaxation-free(SERF) magnetometer based on uniform light field. The ceramic ferrule is used to expand the Gaussian beam to improve light intensity uniformity, while the volume of the sensor is also reduced. This scheme makes the magnetometer have better sensitivity when the detected light intensity is less than 3.16 m W/cm^(2) at 120℃. When the temperature rises to 150℃ the sensitivity under the action of uniform light field is 18.5 f T/Hz^(1/2). The bandwidth of the sensor remains at the original level and meets application needs. The proposed structure improves transverse polarization uniformity within the miniaturized sensor, which is ideal for the magnetoencephalography and magnetocardiography imaging systems.展开更多
Uniform indoor lighting is essential for enhancing visual comfort,reducing glare and shadows,and improving occupant productivity.However,achieving consistent illumination across multiple zones is challenging due to th...Uniform indoor lighting is essential for enhancing visual comfort,reducing glare and shadows,and improving occupant productivity.However,achieving consistent illumination across multiple zones is challenging due to the dynamic interplay between daylight and artificial lighting,as well as the mutual influence among distributed lighting units.This study proposes a novel multi-zone uniform lighting control strategy based on a modular and scalable distributed framework.The system integrates both daylight and electric lighting control:a fuzzy logic controller regulates venetian blinds in response to changing daylight conditions,while a deterministic policy iteration algorithm,built upon an improved Extreme Learning Machine(ELM),manages artificial lighting.To enhance the generalization and adaptability of the ELM,the Sparrow Search Algorithm(SSA)is employed for hyperparameter optimization.A prototype system incorporating multiple luminaires and shading devices was developed and tested under real-world dynamic lighting conditions.Experimental results demonstrate that the proposed method effectively maintains uniform illumination across multiple areas,with a maximum relative error of less than 10%between actual and target illumination levels.The system exhibits strong real-time performance,stability,and adaptability to environmental changes.This research provides a practical,learning-based control solution suitable for complex indoor environments,and offers additional insights into the design of intelligent lighting systems for modern buildings.展开更多
基金financially supported by the Ministry of Education, Science, and Technology (MEST)the National Research Foundation of Korea (NRF) through the Human Resource Training Project for Regional Innovationsupported by the Human Resources Development of the Korea Institute of Energy Technology Evaluation and Planning (No.20114010203040) grant funded by the Korean government’s Ministry of Knowledge Economy
文摘In a commercialized, fully artificial plant factory, artificial luminaire is arranged in a unified way using a general illumination theory, an actual measurement, or an empirical methodology. However, with these methods, lightings are implemented without considering specific optical characteristics of lighting or material characteristics of each component that constructs a cultivation system, resulting in an amount of light that becomes irregular. The amount of lighting is closely related with the growth and quality of crops, and the deviation between points where cultivated crops are located causes quality difference in the produced crops, thus impairing the economic feasibility of a plant factory. In this regard, a simulation to figure out an optimum lighting layout was performed. Arrangements based on the spectrum distribution of light source and reflector materials were implemented to ascertain the distance between lighting and height of lighting and gather information in the pre-treatment process to improve the uniformity of light in the plant cultivation system. Improvement of around 15% in light uniformity is achieved compared with the existing system after the simulation is carried out. This result would reduce the deviation in crop growth to make uniform quality crop production possible.
基金the National Natural Science Foundation of China (Grant No. 62003020)。
文摘We experimentally study the dynamic characteristics of a miniaturized spin-exchange relaxation-free(SERF) magnetometer based on uniform light field. The ceramic ferrule is used to expand the Gaussian beam to improve light intensity uniformity, while the volume of the sensor is also reduced. This scheme makes the magnetometer have better sensitivity when the detected light intensity is less than 3.16 m W/cm^(2) at 120℃. When the temperature rises to 150℃ the sensitivity under the action of uniform light field is 18.5 f T/Hz^(1/2). The bandwidth of the sensor remains at the original level and meets application needs. The proposed structure improves transverse polarization uniformity within the miniaturized sensor, which is ideal for the magnetoencephalography and magnetocardiography imaging systems.
基金the National Natural Science Foundation of China(No.62473236).
文摘Uniform indoor lighting is essential for enhancing visual comfort,reducing glare and shadows,and improving occupant productivity.However,achieving consistent illumination across multiple zones is challenging due to the dynamic interplay between daylight and artificial lighting,as well as the mutual influence among distributed lighting units.This study proposes a novel multi-zone uniform lighting control strategy based on a modular and scalable distributed framework.The system integrates both daylight and electric lighting control:a fuzzy logic controller regulates venetian blinds in response to changing daylight conditions,while a deterministic policy iteration algorithm,built upon an improved Extreme Learning Machine(ELM),manages artificial lighting.To enhance the generalization and adaptability of the ELM,the Sparrow Search Algorithm(SSA)is employed for hyperparameter optimization.A prototype system incorporating multiple luminaires and shading devices was developed and tested under real-world dynamic lighting conditions.Experimental results demonstrate that the proposed method effectively maintains uniform illumination across multiple areas,with a maximum relative error of less than 10%between actual and target illumination levels.The system exhibits strong real-time performance,stability,and adaptability to environmental changes.This research provides a practical,learning-based control solution suitable for complex indoor environments,and offers additional insights into the design of intelligent lighting systems for modern buildings.
