• Proceedings of the KSME Conference
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• 2000.04a
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• pp.737-740
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• 2000

Injection molded plastic parts have many appearance imperfections: weld line sink mark flow mark, gloss, shading, scratching, etc. Because these appearance faults have not accepted esthetically, so pastic parts are produced through painting or texturing. The purpose of this paper is to develop a paintless molded part of TV Mask Front, using numerical simulations and experiments. In order to minimize problems of injection, this study carried out computer aided injection mold filling simulations using MF/FLOW. Based on these numerical results we developed FR(Flame Retardant) HIPS and estabilished guidelines of part design, mold design, and processing conditions. We took effects of cost savings, inprovement of productivity, and utilization of recycling by eliminated painting process.

• Transactions of Materials Processing
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• v.11 no.8
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• pp.691-700
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• 2002

Injection molded plastic parts have many surface detects: weld line, sink mark, flow mark, gloss, shading, scratching, and so on. Because these surface faults have not been accepted esthetically, plastic parts are Produced through painting or texturing. The purpose of this paper is to develop a paintless molded part of TV Mask Front by flow control method and gas-assisted injection molding. In order to minimize defects from injection molding, this study was carried out using computer aided injection mold filling simulations using MF/FLOW and MF/GAS. Based on these numerical results, we developed FR(Flame Retardant) HIPS and established guidelines of part design, mold design, and Processing conditions. We have achieved of cost sayings, improvement of productivity, and utilization of recycling by eliminating surface defects and painting process.

• Journal of Industrial Convergence
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• v.3 no.1
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• pp.169-189
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• 2005

Recently, elderly populations are coming out as the first magnitude consumers. The purpose of the study is to present the basic data on the use of television media of elderly people and help developing the consumer market for the elderly people. This study was based on a survey conducted on the use of television media of Korean people over 20 years old with a thorough review of literatures published worldwide. This study revealed that the elderly consumers are more often dependent on television media than younger populations. This results will be applied in establishing a relevant promotion strategy for elderly marketing.

• Design & Manufacturing
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• v.13 no.1
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• pp.36-41
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• 2019

A large plastic molding requires an injection molding with a large clamping force. However, it could not be prepared in the manufacturing at any time. In order to solve the problem, the injection molding analysis study was conducted on the back cover of 55 inch LED TV. The study compared the case of applying the existing flow system such as hot runner, the improvement of the hot runner lay-out and the precise control of the gate operation time, From the results of using the improved flow system, it was found that the welding and the clamping force were considerably improved as compared with before the improvement. In particular, the clamping force was reduced by 50% compared with before the improvement.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.13 no.3
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• pp.564-571
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• 2009

In this paper, we propose out-of -band collaborative spectrum sensing scheme in the cognitive radio (CR) base station operated by the multiple frequency channels. Also this paper presents the signal detection results for ATSC digital TV signal as an incumbent signal and derives signal detection probability and false alarm probability for the out-of-band collaborative spectrum sensing scheme in frequency selective Rayleigh fading channel. Numerical results demonstrate that the sensing performance is improved by the out-of-band collaborative spectrum sensing in the case that the incumbent signal powers measured by the CR terminals of the multiple frequency channels are almost similar.

• The Journal of the Korea Contents Association
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• v.7 no.6
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• pp.99-106
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• 2007

This study aimed at finding out news viewership composition of the major 5 broadcasting companies in Korea and analysing the reasons behind their channel choice as we live in so-called the 'multi-channel era'. To figure out demographic features and channel preferences of viewers, the study focused on the 4 watcher types; channel loyalty type, brief news type, central watcher type and peripheral watcher type. The result shows that most viewers fall into the 'brief new type', which means that there is a close relation between life style changes and TV news-contents viewership. Channel preferences were found to differ according to demographic features of viewers like gender, age and professions.'Central Watcher' type was found to prefer KBS1; 'channel loyalty' type, MBC; 'peripheral watcher', SBS; and 'brief news' type, YTN, while only KBS2 has no distinctive viewership of its own.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.24 no.4
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• pp.57-65
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• 2010

In this paper we proposed channel models for terrestrial ATSC (Advanced Television Systems Committee) DTV (Digital Television) system in South Korea. For the purpose of this model, we research on propagation model involved in terrestrial DTV system and analyze out field test data of terrestrial DTV broadcasting carried out in korean Broadcasting System. Using the measured values of received field strength, newly proposed Path-loss models have more correctly than that of conventional Path-loss models. This models can be utilized usefully for the efficient ATSC DTV system implementation requiring accurate link-budget calculation

• KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
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• v.9 no.1
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• pp.7-10
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• 2003

This study was carried out to investigate vibration shock of electric appliances during transport. Microwave oven, TV, washing machine and refrigerator were singled out as the study items. Transport courses were selected as follow ; an expressway between Kumi and Seoul for TV, an expressway between Kwangju and Seoul for microwave oven and washing machine, a national road between Inchon and Seoul for refrigerator. the values of vibration shock were measured to be ${\sim}3G$ on the national road and 1G on the expressway for up and down direction, ${\sim}0.5G$ on the national road and expressway for back and forth direction and ${\sim}0.8G$ on the national road and expressway for right and left direction. There was no damage during transport. These values were corresponding to grade II of KS A 1026 (General Rules of Performance Testing for Packaged Freights).

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.12
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• pp.8274-8283
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• 2015

Gas springs of the television is to control the piston speed when operating under along stroke(200~300 mm, television elevation)is possible. User by this principle is capable of elevation adjustment. First carried out a flow analysis of the piston. A piston speed adjustment technique for precise pipe type cross-section was examined. The piston structure for flow rate control and elevation action is proposed. This study is the development of a gas spring of more than 50 inch television with a large television stand. Hollow piston rod for optimal control(the outer diameter 19.9 mm, the inner diameter 13.9 mm) was injected into the nitrogen gas(0.3 mm/s) in. As a result, the flow rate the pressure drop of the piston rod as the increase was increased without any change of the external force. As a result, control of the displacement via the gas spring is possible.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.2
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• pp.429-435
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• 2018

Space plays a very important role in the human residential environment. Space is where the direct experience of life and expansion of that experience are made out of simple residential space. In particular, kitchen space is where the importance of the living space is perceived and is becoming an everyday part of life through television programs. Thereby, kitchen space is where the culture of everyday life plays a role in communication based on the very important production and function of television culture. The kitchen is where various experiences emerge. It is a space where the phenomena of communicating through cooking, experiencing tastes, and communicating with family members is realized. The purpose of this study is to analyze the relationship between communication and production in the kitchen through analysis of "Yune Restaurant 1" on tvN channel. The results of this study show that the human kitchen space leads to expansion of various experiences in the process of various cultural discounts.