• The KIPS Transactions:PartC
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• v.13C no.4 s.107
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• pp.491-500
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• 2006

In this paper, the management architecture and the ubiquitous profile based on CC/PP for contents adaptation in the ubiquitous environment is designed. The components and the attributes of the ubiquitous profile are defined based on the services scenario of contents adaptation in the ubiquitous environment. The ubiquitous profile was applied to techniques such as standard vocabulary, CC/PP structure, RDF schema and RDF to use effectively in the ubiquitous environment during the design. Also we design and propose the another management architecture based on ideas such as the dynamic constitution method, the metadata constitution method using a repository and the management method of gateway on center for the effective management of the ubiquitous profile. The result of performance evaluation for the proposed management architecture is more effective compared with the previous management method of the profile. The proposed the ubiquitous profile and the management architecture has provided the foundation of the research for a user to adaptation contents services in the ubiquitous environment.

• Composites Research
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• v.37 no.1
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• pp.32-39
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• 2024

Solid-state hydrogen storage is gaining prominence as a crucial subject in advancing the hydrogen-based economy and innovating energy storage technology. This storage method shows superior characteristics in terms of safety, storage, and operational efficiency compared to existing methods such as compression and liquefied hydrogen storage. In this study, we aim to evaluate the solid hydrogen storage performance on the nanotube surface by various structural design factors. This is accomplished through molecular dynamics simulations (MD) with the aim of uncovering the underlying ism. The simulation incorporates diverse carbon nanotubes (CNTs) - encompassing various diameters, multi-walled structures (MWNT), single-walled structures (SWNT), and boron-nitrogen nanotubes (BNNT). Analyzing the storage and effective release of hydrogen under different conditions via the radial density function (RDF) revealed that a reduction in radius and the implementation of a double-wall configuration contribute to heightened solid hydrogen storage. While the hydrogen storage capacity of boron-nitrogen nanotubes falls short of that of carbon nanotubes, they notably surpass carbon nanotubes in terms of effective hydrogen storage capacity.

• 한국신재생에너지학회:학술대회논문집
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• 2010.06a
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• pp.206.2-206.2
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• 2010

현재 RPF 생산공정에서 생산된 RPF는 약 7,500~8,500kcal/kg 의 높은 열량을 지니고 있다. 이러한 특성으로 연소시 소각로 내부의 온도가 부분적으로 급격히 상승하여 적정온도조절이 어렵고, 로내 장치들의 내구성이 저하되는 등 문제가 발생하고 있다. 또한, RPF에 포함된 비교적 높은 농도의 염소 함량(0.8~1.8% wt)으로 인해 다량의 대기오염물질이 발생되는 단점이 나타나고 있다. 따라서, 이러한 문제점들을 개선하기 위해 RPF의 개질이 필요하며 본 연구에서는 슬러지와 RPF를 혼합하여 열량, 성형성, 염소함량등을 고려하여 최적의 혼합비율을 선정하였다. J하수처리장에서 발생하는 하수슬러지를 이용하여 5, 15, 25, 30, 35%를 RPF 성형공정에 혼합하여 실험하였다. 5% 혼합시 발열량은 약 6,300~6,800kcal/kg, 염소농도는 0.8~1.6%(wt), 15% 혼합시 발열량은 5,500~6,000kcal/kg, 염소농도는 0.7~1.4%(wt), 25% 혼합시 발열량은 5,200~5,900kcal/kg, 염소농도는 0.6~1.1%(wt), 30% 혼합시 발열량은 5,000~5,700kcal/kg, 염소농도는 0.6~1.0%(wt), 35% 혼합시 발열량은 4,800~5,200kcal/kg, 염소농도는 0.4~0.6%(wt)으로 나타났다. 각 혼합비율에서 관찰된 성형성은 5~25% 혼합까지는 성형된 RPF와 유사하게 일정한 크기 및 강도를 유지 할 수 있었으나, 25% 이상 혼합시 분말형태의 가루가 많이 발생되며 강도가 약해져 쉽게 부스러지는 문제점등이 나타났다. 연료의 개질 형태나 성형성등을 고려하였을 때 슬러지 혼합비율이 약 15~25% 정도가 최적 혼합비율인 것으로 나타났다.

• The Journal of the Korea Contents Association
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• v.14 no.4
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• pp.418-424
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• 2014

This paper aim; to develop the National R&D Information Navigation System(NRnDINS) that is convenient and easy to use by the researchers on the basis of information filtering and visualization by converging and integrating the three types of the contents, namely, paper, report and project at the stage of development of the information system An information system is developed by establishing ontology and RDF on the three types of contents, and by applying information filtering and semantic search technology after having created the prototype for the screen by reflecting the user needs analysis and information visualization elements surveyed at the previous stage of information service planning. In this paper, to make the measure for information filtering, R&D navigation index is prosed and implemented, and NRnDINS capable of integrated search of the R&D contents through information visualization is developed. Also, for the testing of the developed system, the preference survey for its design by 1m persons and usability test of the system by 10 users are performed The result of the survey on the preference for the design is affirmative with 85% of the subjects finding it favorable and the composite receptivity is good with the score of 87.2 the results of the usability test. However, it was also found that further development of the personalization functions is needed. It is hoped that the R&D navigation index of the proposed and implemented in this paper would present quantitative objectivity and will induce further development of other information filtering index of contents in the future.

• Membrane Journal
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• v.24 no.6
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• pp.453-462
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• 2014

Thin film composite (TFC) polyamide (PA) membranes were prepared on polyester (PET) nonwoven reinforced polysulfone supports for forward osmosis (FO) processes. PSF (polysulfone) supports were prepared via the phase inversion process from PSF casting solutions in dimethyl formamide (DMF) solvents (19 wt%) by using a PET nonwoven (thickness of $100{\mu}m$) as a mechanical reinforcing material for reverse osmosis (RO) membrane. The PSF support from 19 wt% of DMF/PSF casting solution showed sponge-like morphology and asymmetric internal structure. To reduce the internal concentration polarization in FO operation, thin ($20{\mu}m$ of thickness) nonwoven-supported PSF supports were prepared by using PSF/DMF casting solution (9~19 wt%). A desirable support structure with a highly porous sponge-like morphology were achieved from the thin nonwoven-supported PSF layer prepared with 9~12 wt% casting solution. A crosslinked aromatic polyamide layer was fabricated on top of each support to form a TFC PA membrane. The tested sample from 12 wt% of DMF/PSF casting solution presented outstanding FO performance, almost 5.5 times higher water flux (24.3 LMH) with low reverse salt flux (RDF, 1.5 GMH) compared to a thick nonwoven rainforced membrane (4.5 LMH of flux and 3.47 GMH of RSF). By reducing the thickness of the nonwoven and optimizing PSF concentration of casting solution, the morphology of the prepared membranes were changed from a dense structure to a porous sponge structure in the boundary area between nonwoven and PET support layer.