Lee J.,Pusan National University |
Lee J.,SKC Inc |
Kim G.-H.,Dongseo University |
Ha C.-S.,Pusan National University
Journal of Applied Polymer Science | Year: 2012
In this study, polyurethane (PU)/nano-silica nancomposite foams were prepared. The effects of isocyanate index, cell size, density, and molecular weight of polyols on the sound absorption ratio of PU/nano-silica foams were investigated. With increasing nano-silica content, the sound absorption ratio of PU/nano-silica foams increases over the entire frequency range investigated in this study. Decrease of isocyanate index, cell size, and increase of density leads to the increase of sound absorption ratio of PU/nano-silica foams. PU/nano-silica foams have a broad Tg centered around room temperature by decreasing molecular weight of polyol resulting in good sound absorbing ability. © 2011 Wiley Periodicals, Inc.
Agency: Department of Defense | Branch: Navy | Program: SBIR | Phase: Phase II | Award Amount: 644.41K | Year: 2005
The proposed program will develop and deliver a rechargeable polymer Lithium-ion battery pack with high energy density, long cycle life and low magnetic signature. This pack will demonstrate to the Explosive Ordnance Disposal (EOD) community that a low magnetic signature polymer Lithium-ion battery pack will add significant performance benefits to their underwater equipment users. We will address all key issues relevant to cell design and pack construction focusing on the fundamental challenges associated with a high energy density, low magnetic signature electro-mechanical device. Concentrated efforts will be spent improving single cell performance to meet or exceed the performance thresholds set for this program. All appropriate lithium battery safety protocols will be fully addressed.
Kim J.,SKC Inc
International Conference on Advanced Communication Technology, ICACT | Year: 2010
C&C view of Software architecture is one of the modelling languages to describe and analyze runtime architecture of a software system. However, it is not sufficient to describe runtime architectural behaviours with only C&C view because C&C view architecture does not provide a sequence and state-chart of a software system. On the other side, we would use Finite State Process (FSP) model for describing behaviour and property of component in a software system. FSP model can be simple to show behavioural sequence and state of component. Moreover, we can check a property of a component with FSP model, once a FSP model of a software system is given. In this thesis, we propose an approach to model and verify C&C view architecture for a software system. Additionally, in using FSP model, the requirements represented using the FSP properties can be automatically checked against the C&C view architecture with a Labeled Transition Systems Analyzer (LTSA). This approach can support early detection of system's behaviour errors automatically.
Skc Co. and SKC Inc | Date: 2011-12-23
A hot air tunnel system apparatus comprising a preheating zone, a labeling zone, and a cooling zone with a transporting member provided through the lower parts of said zones to convey a product to be labeled from the preheating zone to the cooling zone, wherein each zone is equipped with fan heaters on both sides and on the bottom thereof, and also equipped with an air circulation system on the top thereof, which can minimize such labeling defects as loose labels, film curl, and irregular shrinkage when polyethylene-based products are labeled with heat-shrinkable labels.
Skc Co. and SKC Inc | Date: 2012-02-29
A solvent comprising 40 to 100 wt % of 1,3-dioxolane and 0 to 60 wt % of tetrahydrofuran, wherein the solvent further comprises 30 ppm to 800 ppm of an antioxidant, based on the total weight of the solvent, provides a long shelf life with good adhesive strength even after exposure to air. The solvent can be effectively used for labeling of heat-shrinkable polyester-based labels.