• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• v.26 no.3
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• pp.297-300
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• 2000

The author evaluated the effectiveness of pedicled buccal fat pad grafts for closure of oroantral communications. Nine patients with chronic oroantral communications and one patient with an oronasal communication were treated with pedicled buccal fat grafts. They were treated successfully in all cases, and there were no postoperative complications (i. e. shallow buccal vestibule), and minimal patient discomforts. It was concluded that this was a easy and time fast method for closure of oral defects and had wide application and high successful rate.

• Proceedings of the IEEK Conference
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• 2003.07b
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• pp.747-750
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• 2003

We have studied PHEMTs optimization by means of fabrication of PHEMTs. All PHEMTs have been fixed with a gate length of 0.1 ${\mu}{\textrm}{m}$, a gate head size of 0.75${\mu}{\textrm}{m}$, and two gate fingers. We have measured the characteristics of PHEMTs with variation of source-drain spacing, pad size, and gate width. As a result, we have found the enhanced characteristics of $I_{dss}$, $S_{21}$, $h_{21}$, $f_{T}$, $f_{max}$, and $G_{ms}$ with increasing gate width. Also, $g_{m}$ has improved with decreasing source-drain spacing, and $S_{21}$ has improved with deceasing pad size.e.e.e.e.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2001.05a
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• pp.231-234
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• 2001

Shearing, including blanking, trimming, piercing, etc, is one of the most frequently used processes in sheet metal manufacturing. In this paper, an individual set of tooling with an in-die sensor was designed and precisely fabricated to carry out the experiment for the shearing process investigation. Through various experiments, it has been examined the influence of process parameters such as clearance, edge material properties and pad configuration. Since the tension between the part and the scrap increases when the clearance increases, the clearance should be selected properly in order to reduce the burr height. Also removal of the lower pad makes the sheared surface worse and the shearing system unstable. The shearing force increases when the clearance decreases and the friction of the tooling material decreases. Dynamic reaction force is also important to obtain the fine sheared surfaces.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2002.11a
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• pp.462-466
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• 2002

This paper describes a low frequency electrical nerve stimulator for muscle care. The developed system consist of 8bit low power consumed MPU, voltage boosting circuit converting 9V input to 120V output, repairing circuit for distorted output pulse, LED and buttons for I/O, and electro-chemical pad. The pulse generation algorithm for the muscle care effect is developed with basic pulses such as a single phase rectangle pulse, symmetric rectangle pulse, and depolarized interrupt pulse.

• Journal of the Korean Society for Precision Engineering
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• v.16 no.9
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• pp.117-122
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• 1999

Track rubber parts has heat built-up as long as dynamic loading is applied from running tracked vehicles. Durability is required for rubber part to sustain the heat accumulation and heat exchange between rubber-metal assembly and environmental air and ground. For this research, the track assembly was divided into four parts i.e., bottom track shoe, upper track pad, pin busing and metal structure. Three rubber parts and metal structure were modelled and analyzed with MARC package program to obtain time-temperature data which was induced form mechanical work of tracked vehicles. heat accumulation data was obtained from special experiments under the room temperature of 25$^{\circ}C\;and\;35^{\circ}C$ to simulate the actual environmental conditions. From this research, it is cleared that the environmental temperature does not affect to the heat accumulation speed in rubber parts. Also, the heat built-up mechanism was clarified from the thermo-mechanical work based on numerical analysis and experiments.

• Journal of The Korean Society of Integrative Medicine
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• v.2 no.2
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• pp.79-88
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• 2014

Purpose: This study investigated the relationship between smartphone addiction propensities and compare muscle activity of the forearms and brain wave depend on the type of smartphone when inputting text messages. Method: We used an EMG to measure the change in muscle activity by attaching pads to the four muscles in both forearms of all 16 participants. We simultaneously conducted EEG measurements by observing the changes in alpha and beta waves recorded from electrode attached to both ears and the forehead of the participants. The participants had to input a given text using three different types of smartphones for ten minutes each. Result: The comparison of the EMG when inputting text involved a one way analysis of variance and the results showed that the iPad3 was highest for muscle activity followed by GALAXY Note2 and iPhone4. For EEG measurement, a one way analysis of variance was also used and the results showed iPhone4 was higest followed by GALAXY Note2 and finally iPad3 for EEG stress score. Conclusion: The results are thought to be used as reference data for smart phone users.

• The Journal of the Convergence on Culture Technology
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• v.9 no.1
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• pp.763-770
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• 2023

In today's modern fashion industry, along with the Fourth Industrial Revolution, the digital fashion industry using new technologies such as AR (Augmented Reality), VR (Virtual Reality), and Metaverse is gradually expanding. Accordingly, in the field of fashion design education, a new form of fashion illustration using VR technology is attracting attention as a new expression method. Recently, the use of digital tools such as iPads is gradually increasing in the field of education at universities majoring in fashion design, and students' interest in new digital tools is continuously increasing in the process of fashion illustration work. Therefore, this study implements fashion illustration using VR technology, which has been commercialized and popularized in the fashion industry, analyzes the differentiated characteristics compared to fashion illustration completed with iPad, and explores the possibility of using VR technology for fashion illustration as a new expression tool. We looked at the limitations. Through this study, it was found that VR is a positive help to fashion illustration to express the conception and overall connectivity in the three-dimensional aspect of fashion design, and the iPad was found to be suitable for specific and delicate fashion illustration expression. The results of this study are intended to provide basic data for fashion illustration education that can increase students' interest and achievement.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2010.11a
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• pp.375-378
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• 2010

Hot and high speed plume exhausted during KSLV-I flight test is cooled down by an amount of water ejected from 'gas deflector cooling system' of launch complex to reduce the effects on the launch vehicle and launch complex. In this study, simplified axisymmetric computational calculation with 2-phase is carried out to analysis the water injection effects on flow field.

• Journal of the Microelectronics and Packaging Society
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• v.18 no.1
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• pp.35-39
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• 2011

Shearing characteristics of Sn-3.0wt%Ag-0.5wt%Cu ball for standardization of high speed shear test were investigated. The solder ball of 450 ${\mu}m$ in diameter was reflowed at $245^{\circ}C$ on FR4 PCB (Printed Circuit Board) to prepare a sample for the high-speed shear test. The metal pads on the PCB were OSP (Organic Solderability Preservative, Cu pad) and ENIG (Electroless Nickel/Immersion Gold, i.e CulNi/Au). Shearing speed was varied from 0.5 to 3.0 m/s, and tip height from 10 to 135 ${\mu}m$. As experimental results, for the OSP pad, a ductile fracture increased with tip height, and it decreased with shearing speed. In the case of ENIG pad, the ductile fracture increased with the tip height. The tip height of 10 ${\mu}m$ (2% of solder ball diameter) was unsuitable since the fracture mode was mostly pad lift. Shear energy increased with increasing shearing tip height from 10 to 135 ${\mu}m$ for both of OSP and ENIG pads.

• Journal of the Korean Society of Systems Engineering
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• v.2 no.1
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• pp.37-41
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• 2006

The KSLV-I satellite launch vehicle will be launched in a space center currently under construction. The Space Center which is an advance post base of space development of Korea is located on Oenaro island in Kohung, South Cholla Province. A Ground Complex of the Space Center consists of an AC(Assembly Complex), a LC(Launch Complex), and a MCC(Mission Control Center). Assembly and test facilities are located in the AC in which stage assembly, integrated assembly, check-up, certification test, and pre-launch test are made effectively. A launch pad, fuel supply facilities, a launch control center and associated supporting facilities are located in the LC, and the MCC has control over the space center. These ground complex facilities have diverse forms of an interface with mechanical device, electric device, and etc. These should also provide optimum condition and performance during launch operation processes of the launch vehicle. This paper introduces the result of R&D for the AC of the ground complex performed during system design period.