• Proceedings of the PSK Conference
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• 2002.04a
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• pp.205.2-205.2
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• 2002

• Journal of the Korean Society for Precision Engineering
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• v.22 no.8 s.173
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• pp.182-191
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• 2005

It is very important to obtain a high quality of bone image for an accurate ultrasonic measurement of bone mineral density. In this study, we suggested a technique to acquire an optimal image by adapting an acoustic lens and a properly selected ultrasonic probe. Also, we have applied an image processing algorithm with which automatically makes a decision of brightness and contrast of image by generating threshold level, a composition of ultrasonic data, an elimination of noise using modified median filter, and a real time interpolation. We could confirm much improved resolution of bone image with acoustic lens attached to the ultrasonic probe and with the image processing algorithm suggested in this study. Therefore, it became possible to precisely diagnose the osteoprosis using ultrasonic imaging technique.

• The Korea Journal of Herbology
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• v.38 no.5
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• pp.69-84
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• 2023

Objectives : Sik-bang-pung (植防風, Peucedani Japonici Radix), the root of Peucedanum japonicum Thunberg (Apiaceae), has often been used as a substitute for Bang-pung (防風, Saposhnikoviae Radix) in the past, but recently it is treated as a counterfeit of Bang-pung or a kind of 'Jeonho (Peucedani Radix)'. Hence, it is crucial to investigate the origin of herbal name to provide appropriate usage of Sik-bang-pung. Methods : The classic and contemporary literatures regarding to the herbal medicines and botanical nomenclature were searched to find the herbal and botanical origins of Bang-pung and Sik-bang-pung, respectively. Result : The botanical descriptions of Bang-pung (防風) were consistent throughout the classic literatures and its botanical species was determined as Saposhnikovia divaricata Schischkin (Apiaceae) in the compendium. In the literatures published in the Joseon Dynasty, 'Byeong-pung-na-mul' was recorded as the medicinal plant of Bang-pung, but its botanical species could not be confirmed. In Japanese literatures, Bang-gyu (防葵) was confirmed as Mok-dan-bang-pung (牡丹防風); botan-bōfū in Japanese), which was determined as the herbal name of the root of 'Gaet-girum-namul (P. japonicum)' in Korea during the period of Japanese rule. The roots of Gaet-girum-namul was medicinally named as Mok-dan-bang-pung (牡丹防風), Sik-bang-pung (植防風), or San-bang-pung (山防風) in the past decades in Korea. Among them, Sik-bang-pung might be chosen as the herbal name, but its nominal origin could not be found. Conclusions : The herbal name, Sik-bang-pung, was presumably affected by Japanese botanical nomenclature. Although its medicinal application is still controversial, Sik-bang-pung should be considered an independent herbal medicine.

• 한국신재생에너지학회:학술대회논문집
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• 2009.06a
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• pp.529-531
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• 2009

To construct the wind map for mainland Korea, the well designed atmospheric numerical modeling system was used. Three nest domains were construced with spatial resolutions between $10{\times}10km$ up to the hightest resolution of $1{\times}1km$. Parameterization schemes like MRF(PBL), RRTM(radiation), Grell(cumulus) were chosen since wind data simulated is in better agreement with the observed wind data. High-resolution atmospheric numerical model was applied to simulate the motion of the atmosphere and to produce the wind map around the South Korea. The results of several simulations were improved compare to the past system, because of using the fine geographical data, such as terrain height and land-use data, and the meteorological data assimilation.

• Nuclear Engineering and Technology
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• v.30 no.4
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• pp.298-307
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• 1998

In order to design mutual communication between a distributed control system and a function test facility, we used the Inter-Process Communication(IPC) in two systems and Transmission Control Protocol/Internet Protocol(TCP/IP) protocol. The data from the function test facility are put in the shared memory using an IPC, which is then accessed by the distributed control system through an Application Program Interface(API). The server in the function test facility includes two processes(one for sending and one for receiving), which are generated by the fork function from the client signal. The client in the distributed control system includes two separate programs(one for receiving and one for sending).

• Proceedings of the KSR Conference
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• 2008.06a
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• pp.831-834
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• 2008

The spectral element model is known to provide very accurate structural dynamic characteristics, while reducing the number of degree-of-freedom to resolve the computational and cost problems. Thus, the spectral element model with variational method for an axially moving Bernoulli-Euler beam subjected to axial tension is developed in the present paper. The high accuracy of the spectral element model is the verified by comparing its solutions with the conventional finite element solutions and exact analytical solutions. The effects of the moving speed and axial tension the vibration characteristics, wave characteristics, and the static and dynamic stabilities of a moving beam are investigated.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.25 no.5
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• pp.61-66
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• 2011

An accidental disconnection of power supply for operating theatres may result in fatal accidents. Thus, it is necessary to import the electric safety system in medical locations. This paper shows an analysis of simulation for the safety in medical IT system based on KS C IEC 60364-7-710(Electrical Installations of Buildings - Requirements for special installations or locations - Medical locations). The analysis was progressed by measuring leakage currents according to variation of volts, circuits and loads. And it was made database for calculation the reasonable length of branch circuit.

• Journal of the Korean Society for Precision Engineering
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• v.27 no.6
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• pp.64-74
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• 2010

This paper proposes a new TR-based baseline-free SHM technique in which the time-reversal (TR) property of the guided Lamb waves is utilized. The new TR-based SHM technique has two distinct features when compared with the other TR-based SHM techniques: (1) The backward TR process commonly conducted by the measurement is replaced by the computation-based process; (2) In place of the comparison method, the TOF information of the damage signal extracted from the reconstructed signal is used for the damage diagnosis in conjunction with the imaging method which enables us to represent the damage as an image. The proposed TR-based SHM technique is then validated through the damage diagnosis experiment for an aluminum plate with a damage at different locations.

• IE interfaces
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• v.10 no.3
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• pp.133-143
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• 1997

In this paper, an improved method is developed for automatic inspection system using simbology patterns. The developed method uses the two previously developed matching methods the template maching method and the feature matching method. The template matching method is very sensitive to variations of target images such as translation and rotation of objects. On the other hand, the feature matching method doesn't extract proper features in some types of symbology patterns. The proposed method shows the improvement of precision in recognition of defects and flexibility of different types of symbology patterns.

• Proceedings of the IEEK Conference
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• 2007.07a
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• pp.121-122
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• 2007

This paper evaluated the performance of the PAPR reduction scheme[1], which is based on the time- and frequency-domain clippings. This evaluation is carried out on the OFDM system with an nonlinear amplifier, which is described by the Saleh's model.