| 1. |
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| 2. |
- Huo, Hongwei, et al.
(author)
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An Elderly Health Care System Using Wireless Sensor Networks at Home
- 2009
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Conference paper (peer-reviewed)abstract
- The purpose of this project is to integrate the technologies of wireless sensor networks and public communication networks to construct a healthcare system for senior citizens at home without interfering their daily activities. This system provides 4 main functionalities, including indoor monitoring, outdoor monitoring, activity and health state decision, emergency decision and alarm. JTH has developed a prototype of wireless sensor networks, an interconnection platform and a service management platform to support large scale data interconnections and real-time activity and health state reports to related persons (e.g. doctors or nurses, elder-self, elders’ relatives) via all popular communication approaches, such as automatic voice telephone call, SMS or Email etc. In this paper, the system functions and implementation approaches are introduced. A series of experiments results shows that the system performs high validity and reliability.
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| 3. |
- Li, Hairong, et al.
(author)
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Comparative Studies on Rigid pi Linker-Based Organic Dyes : Structure-Property Relationships and Photovoltaic Performance
- 2014
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In: ChemSusChem. - : Wiley. - 1864-5631 .- 1864-564X. ; 7:12, s. 3396-3406
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Journal article (peer-reviewed)abstract
- A series of six structurally correlated donor-pi bridge-acceptor organic dyes were designed, synthesized, and applied as sensitizers in dye-sensitized solar cells. Using the most widely studied donor (triarylamine) and cyclopenta[1,2-b:5,4-b’]dithiophene or cyclopenta[1,2-b: 5,4-b’] dithiophene[2’,1’:4,5]thieno[2,3-d] thiophene as pi spacers, their structure-property relationships were investigated in depth by photophysical techniques and theoretical calculations. It was found that the photovoltaic performance of these dyes largely depends on their electronic structures, which requires synergistic interaction between donors and acceptors. Increasing the electron richness of the donor or the elongation of pi-conjugated bridges does not necessarily lead to higher performance. Rather, it is essential to rationally design the dyes by balancing their light-harvesting capability with achieving suitable energy levels to guarantee unimpeded charge separation and transport.
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| 4. |
- Liu, Hairong, et al.
(author)
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Design and analysis of anti-resonant reflecting photonic crystal VCSEL lasers
- 2004
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In: Optics Express. - 1094-4087. ; 12:18, s. 4269-4274
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Journal article (peer-reviewed)abstract
- Anti-resonant reflecting photonic crystal structure is employed in vertical cavity surface emitting lasers (VCSELs) to achieve photon confinement in lateral direction. Such a design is promising in supporting large-aperture single-mode emission. In the configuration, hexagonal arrays of high-index cylinders which run vertically in the cladding region are introduced in the VCSEL's top DBR (p-DBR) mirror region. The transverse modal property of the proposed structure, especially leakage loss, has been theoretically investigated. An optimum design for the minimum radiation loss while maintaining single-mode operation has been discussed in this paper.
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| 5. |
- Liu, Hairong, et al.
(author)
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Design and analysis of anti-resonant reflecting photonic crystal VCSEL lasers
- 2004
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In: Optics Express. - : Optical Society of America. - 1094-4087. ; 12:18, s. 4269-4274
-
Journal article (peer-reviewed)abstract
- Anti-resonant reflecting photonic crystal structure is employed in vertical cavity surface emitting lasers (VCSELs) to achieve photon confinement in lateral direction. Such a design is promising in supporting large-aperture single-mode emission. In the configuration, hexagonal arrays of high-index cylinders which run vertically in the cladding region are introduced in the VCSEL’s top DBR (p-DBR) mirror region. The transverse modal property of the proposed structure, especially leakage loss, has been theoretically investigated. An optimum design for the minimum radiation loss while maintaining single-mode operation has been discussed in this paper.
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| 6. |
- Liu, Hairong, et al.
(author)
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Optimum design of anti-resonant reflecting photonic crystal vertical-cavity surface-emitting lasers
- 2005
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In: Chinese Optics Letters. - 1671-7694. ; 3:SUPPL, s. S210-S212
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Journal article (peer-reviewed)abstract
- Anti-resonant reflecting photonic crystal structure in vertical-cavity surface-emitting lasers (VCSELs) to achieve photon confinement in lateral direction is introduced. This kind of design is proposed to support large aperture single-mode emission. A proper method to fabricate the proposed structure has also been discussed. Firstly a spacer layer will be fabricated between the active layer and pDBR layer. A hexagonal array of high-index cylinders will be designed by etching and re-growth on the spaced layer. The transverse modal property of the proposed structure has been investigated. An optimum design for the minimum radiation loss by considering of the cylinder diameter has been discussed in this paper.
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| 7. |
- Liu, Hairong, et al.
(author)
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Theoretical investigation on guiding IR light in hollow-core metallic fiber with corrugated inner surface
- 2010
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In: Optics Express. - 1094-4087. ; 18:21, s. 21959-21964
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Journal article (peer-reviewed)abstract
- Hollow metallic fibers (HMFs) are in general lossy primarily owing to the fact that the guided transverse-magnetic (TM) light sustains a relatively high propagation loss. In this paper, we propose a type of practical hollow-core metallic fiber (HMF) with longitudinally corrugated inner surface for transmitting infrared (IR) light. Simulation results show that the loss of the fundamental TM mode can be easily reduced by 50 similar to 100 times compared to a HMF without surface corrugation. In contrast to the traditional HMF with a dielectric coating, it is shown that the loss of the fundamental TM mode in the proposed HMF is relatively insensitive to the corrugation layer thickness or equivalently the operating frequency.
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| 8. |
- Liu, Hairong, et al.
(author)
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Theoretical investigation on guiding IR light in hollow-core metallic fiber with corrugated inner surface
- 2010
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In: Optics Express. - : Optical Society of America. - 1094-4087. ; 18:21, s. 21959-21964
-
Journal article (peer-reviewed)abstract
- Hollow metallic fibers (HMFs) are in general lossy primarily owing to the fact that the guided transverse-magnetic (TM) light sustains a relatively high propagation loss. In this paper, we propose a type of practical hollow-core metallic fiber (HMF) with longitudinally corrugated inner surface for transmitting infrared (IR) light. Simulation results show that the loss of the fundamental TM mode can be easily reduced by 50~100 times compared to a HMF without surface corrugation. In contrast to the traditional HMF with a dielectric coating, it is shown that the loss of the fundamental TM mode in the proposed HMF is relatively insensitive to the corrugation layer thickness or equivalently the operating frequency.
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| 9. |
- Yan, Hairong, et al.
(author)
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An experimental study on home-wireless passive positioning
- 2008
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In: Proceedings of the 2nd International Conference on Sensor Technologies and Applications (Sensorcomm), August 25-31, 2008, Cap Esterel, France. - : IEEE. - 9780769533308 ; , s. 223-228
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Conference paper (peer-reviewed)
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| 10. |
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