In this paper, we propose a polarization-selective color filter that can generate two different color informations simultaneously depending on the polarization direction. The proposed color filter is mainly composed of the etalon structure to generate the color by the structural resonance properties while the upper layer of the etalon is made of plasmonic nanogratings to promote polarization-dependent color properties. When the duty ratio of the silver nanogratings is fixed, the proposed color filter can maintain identical optical properties for orthogonal polarization, while the etalon structure of the proposed color filter can manipulate different color information depending on the cavity height for the horizontal polarization. Finally, we experimentally confirm that polarization-dependent security images can be generated using the proposed color filters with a fixed duty ratio of various nanograting arrays.
Metamaterial Sensors show significant potential for applications ranging from hazardous chemical detection to biochemical analysis with high-quality sensing properties. However, they require additional measurement systems to analyze the resonance spectrum in real time, making it difficult to use them as a compact and portable sensor system. Herein, we present a novel wireless-powered chemical sensing system by using energy-harvesting metamaterials at microwave frequencies. In contrast to previous studies, the proposed metamaterial sensor utilizes its harvested energy as an intuitive sensing indicator without complicated measurement systems. As the spectral energy-harvesting rate of the proposed metamaterial sensor can be varied by changing the chemical components and their mixtures, we can directly distinguish the chemical species by analyzing the resulting output power levels. Moreover, by using a 2.4 GHz Wi-Fi source, we experimentally realize a prototype chemical sensor system that wirelessly harvests the energy varying from 0 mW up to 7 mW depending on the chemical concentration of the water-based binary mixtures.
ㄴToday the beauty industry has reached a point of saturation, and competition has become fiercer than ever. Furthermore, customer needs and expectations have become increasingly sophisticated and diversified.In particular, it has become more difficult for small beauty salons to maintain customer loyalty by staying competitive and satisfying customer needs and demand. In fact, beauty salon customers want to get individualized services as well as a wide variety of hairstyles. Therefore, this study attempted to analyze the sustainability management of beauty salons. It looked at how an increase in sales and in customer loyalty can be achieved by enhancing awareness of the fact that small beauty salons' competitiveness stems from strenuous efforts for the best customer service, individualized hairstyling services, professional skills and customer trust. The study results found that beauty salons need to keep promoting development and improvement for the following: advanced skills, excellent services, reasonable price, convenient locations, advertisement and PR, development of an exclusive manual, intensive staff training and character education plan, complaint management and follow-up and decrease in customer migration.
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