Home network service area increases and different types of service hardware are used for each service, as a result complexity also increases.It is necessary to develop a convergence service platform for home network.In this paper, a modular type home network service platform is proposed and implemented for different types of services.This platform is equipped with sufficient interface and expansion facilities for different service module.It uses Real Time Operating System (RTOS), framework and Platform Application Interface (API) for services.It has flexibility to support each service depending on the selected hardware module.It provides convergence service (Home device control and status monitoring management service, healthcare service, community computing service, etc) platform for home user.
This study verifies the feasibility and optimal conditions for using a general-purpose x-ray imaging device with a relatively large detector and excellent image quality compared to dental x-ray imaging devices according to international standards. The dental material test specimens were produced in the form of disks from four companies with different radiopacity, and aluminum step wedges was manufactured according to ISO 13116. In order to find the optimal irradiation conditions for general X-ray imaging devices, the distance between the target and the tube was fixed at 700 mm, and the exposure time was fixed at 100 ms. And the tube voltage was 50, 60, 70 kV and the tube current was changed to 40, 80, and 160 mA. As a result, it was sufficient to use general-purpose X-ray imaging devices, and the best results were obtained under the optimal conditions of 60 kV and 40 mA.
A poly(methyl methacrylate) (PMMA) base gradient-index plastic optical fiber (GI-POF) was fabricated by the diffusion-assisted coextrusion process using diphenyl sulfide (DPS) as a refractive index modifying dopant. In the diffusion-assisted coextrusion process, PMMA containing DPS and pure PMMA were coextruded concentrically as the core and cladding, respectively. Subsequently, DPS contained in the core was allowed to diffuse in the diffusion zone of a coextrusion die forming a gradually varying concentration gradient in the radial direction. Thereby, a refractive index profile was created. The refractive index profile was then characterized by measuring the concentration profile of DPS using FT-IR spectroscopy. The measured profiles showed a good agreement with the predictions of the theoretical model reported previously (Ind. Eng. Chem. Res. 2001, 40, 3740). Because the concentration profile of the dopant is strongly affected by its diffusivity, the refractive index profile could be controlled by adjusting the processing temperature and/or the residence time of the materials in the coextrusion die. The results of this study suggest that the diffusion-assisted coextrusion process is a viable method to fabricate a GI-POF with a bandwidth higher than 600 Mbits/s at a distance of 100 m.
For the problems in executing rural development, recent recognitions are that discovery, preservation, and utilization of area-unique resource are unsatisfactory, that participation of local residents was neglected, and that approach to gradual refurbishment of houses and common space of town in consideration of existing spatial pattern of the town was not adequate. Especially, neglect for exact investigation, analysis and evaluation on rural local resources is bringing about social problems such as mass production of uniform rural area and loss of local identity. In this study, rural resources were listed and resource evaluation items was designed in order to establish development direction of rural village. According to these results, for the efficient and reasonable drive of the resource evaluation system, following items are required; A premise of local development by participation of local people, Development of diversely appliable resource evaluation clauses, Establishment of development type in connection with resource evaluation clauses, Systematic management of local resource through spreading DB resource. This research was loused on unearthing direction development of rural village and theme. However, what should be reconsidered through continuous study is that resource evaluation clauses are somewhat general and not concretely illustrated. Therefore establishment of characterized development is expected through clarifying local identity and presenting direction of local development, with the importance of resource and systematic analysis in planning on rural village in the future.
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