• Korea-Australia Rheology Journal
• /
• v.15 no.4
• /
• pp.173-178
• /
• 2003

Boron nitride is a new processing aid that is capable of eliminating gross melt fracture in several polymer processing operations. Its combinations with other processing aids i.e. fluoropolymers offer additional possibilities of obtaining enhanced processing aids that may take the processes to rates not realized before. A variety of different such combinations are discussed in this paper. The essential componenets are (1) boron nitride capable of eliminating gross melt fracture and (2) suitable lubricant capable of eliminating surface melt fracture such as stearates for the polyolefin processing and polyethylenes for the processing of fluoropolymers.

• Proceedings of the KOSOMBE Conference
• /
• v.1997 no.11
• /
• pp.83-86
• /
• 1997

To provide ameliorated aided environment to hearing impaired listeners, background noise reduction techniques are investigated as a front-end of conventional hearing aids, and their effects are tested in a subjective manner. Several speech enhancement schemes were implemented and preference tests or normal listeners are performed to select the best possible scheme or hearing impaired listeners. Results indicated that SDT scores without the speech enhancement scheme drop more sharply as SNR decreases than those with the speech enhancement techniques. SDT scores obtained or hearing impaired listeners with hearing aids showed large variability. However, all impaired listeners preferred noise suppressed sounds to unsuppressed ones.

• Proceedings of the KIEE Conference
• /
• 2002.11a
• /
• pp.112-115
• /
• 2002

The effects of processing aids(P.A.) in semicoductive compounds(S.C.) with highly loaded carbon black for extra high voltage cables were investigated. The processability of S.C. is improved as the contents of P.A. increased, however, the electrical, mechanical properties and smoothness of S.C. grew worse, especially for the S.C. which contains 5wt% of P.A., the volume resistivity after heat cycle which shows long term reliability increased about three times after 15cycles compared to the S.C. which contains no P.A. We inferred that it is caused by the action of P.A. as the insulating sites, thermal expansion of polymer matrix which leads the length between carbon blacks to shorten, and the decrease of degree of crosslinking. The change of ion contents which means cleanliness of S.C. is not occured regardless of the addition of P.A.

• Proceedings of the Korean Society of Fisheries Technology Conference
• /
• 2001.10a
• /
• pp.91-92
• /
• 2001

Enzymes have been used as processing aids in the manufacture of food products to improve their quality, solubility and stability for centuries. About 50％ of the enzymes used as industrial processing aids are protein hydrolases which have been used in a number of industrial application including laundry detergents, feed, leather treatment, silk degumming, cheese making, chill proofing, meat tenderzing, fermented sauces, and pharmaceuticals. (omitted)

• Proceedings of the Korean Society of Fisheries Technology Conference
• /
• 2001.10a
• /
• pp.22-22
• /
• 2001

Enzymes have been used in practical applications as diverse as brewing and industrial fermentations, detergent, analytical determinations and recombinant DAN technology. As processing aids, enzymes have been used in the manufacture of food products to improve their quality, solubility and stability for centuries. About 50％ of the enzyme used as industrial processing aids are pretenses which have been used in a number of industrial applications including laundry detergents, chill proofing, meat tenderizing, fermented sauces, and the production of pharmaceuticals. (omitted)

• Elastomers and Composites
• /
• v.55 no.4
• /
• pp.289-299
• /
• 2020

Highly aromatic (HA) oils are common processing aids used in tire tread compounds. However, they often bleed and evaporate from the vulcanizates during tire use. Thus, the mechanical and dynamical properties of the tire decrease. To overcome this problem, we investigated nonfunctionalized liquid butadiene rubber (LBR-305, Kuraray) and center-functionalized liquid butadiene rubber (C-LqBR), polymerized by anionic polymerization. In addition to the liquid butadiene rubbers, p-tert-octylphenol (P-Resin) and C5 hydrocarbon (H-Resin) tackifier resins, which can induce entanglement of rubber compounds, were researched as a processing aid to solve the bleeding problem. Liquid butadiene rubbers have significantly reduced extraction loss by crosslinking with the main rubber chain. They have also increased the abrasion resistance and showed similar or better mechanical and dynamical properties against HA oils. However, resin compounds did not show differences in extraction loss compared to HA oil compounds; instead, they showed increased wet traction.

• Journal of Biomedical Engineering Research
• /
• v.17 no.3
• /
• pp.347-354
• /
• 1996

This paper presents digital hearing aids signal processing system in WT(wavelet transform) domain. For implementation of hearing aids in WT domain, the gain in frequency domain is approximated in WT domain. We also present the gain selection algorithm to deal with the change of input signal power. Most transform methods produce blocking effect, and this effect degrades the convergence rate of feedback canceller. As a solution, we proposed wavelet transform bascd feedback canceller. To evaluate the performance, we compared it with LOT (lapped orthogonal transform) method in the frequency domain. This system has not shown the blocking effect, and improves convergence rate as compared with the LOT based feedback canceller.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.29 no.5C
• /
• pp.673-682
• /
• 2004

The adaptive beam-forming is promising approach for noise reduction in hearing aids. This approach has come in the focus of interest only recently, because of the availability of new and powerful digital signal processors. The adaptation U using usually a Least Mean Squares algorithm, updates the weight vector. In this Paper, we propose a fast wavelet based adaptive algorithm using variable step size algorithm which varies adaptive constant by the change of signal environment. We compared the performance of the proposed algorithm with the known adaptive algorithm using computer simulation of multi channel adaptive bemformer in hearing aids. As the result the proposed algorithm is suitable for adaptive signal processing area using hearing aids and has advantages reducing computational complexity. And we show the beam-forming system using proposed algorithm converges stably in a sudden change of system environment.

• Journal of Navigation and Port Research
• /
• v.26 no.3
• /
• pp.269-274
• /
• 2002

It is said to be very difficult to maintain the aids to navigation such as buoys end lighthouses due to their geographical characteristics. This paper, as a part task of the construction of aids to navigation control center, describes the method to make the module for remote-controlling lighthouses and buoys. We become to be able nor only to get informations such as the condition of lights and batteries, but also to control remotely the aids to navigation by using microwaves so as to maintain them in good condition.

• Journal of the Korean Society of Marine Environment & Safety
• /
• v.29 no.5
• /
• pp.456-461
• /
• 2023

The Korea Maritime Environment Corporation is conducting a comprehensive survey of the national marine ecosystem under the commission of the Ministry of Oceans and Fisheries (MOF) to ensure continuous use of the ocean, preserve and manage the marine ecosystem. The survey has set major peaks to investigate changes in the marine ecosystem around the Korean Peninsula. However as the peak has been set around the coast, it is necessary to expand the scope of investigation to encompass offshore areas. Meanwhile, the Aids to Navigation Division of the MOF supports a comprehensive national marine ecosystem survey providing photographs of fouling organisms during the Aids to Navigation lifting inspection, however, the photographs are provided only in consultation with the Korea Maritime Environment Corporation. Therefore, a study was conducted to generate information on fouling organisms using deep learning-based image processing algorithms by the lifting Aids to Navigation and dorsal buoys so that Aids to Navigation could be used as the major component of a comprehensive national marine ecosystem. If the Aids to Navigation are used as the peak of the survey, they could serve as fundamental data to enhance their own value as well as analyze abnormal marine conditions and ecosystem changes in Korea.