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김만수,정현모,김기석,박정길 충남대학교 농업과학연구소 2005 농업과학연구 Vol.32 No.1
During a long journey of agricultural products from the production area to markets, the quality of agricultural products was always affected by some degree of vibration. The vibration input during the transportation may cause serious agricultural product injury, and this damage is particularly severe whenever the vegetable inside package is free to bounce, and is vibrated at its resonant frequency. The objectives of this study were to determine the resonant frequency of the oriental melon and to investigate the relationships between resonant frequency and physical properties of the oriental melon such as mass, volume and major and minor axes. In this study vibration testing device was constructed to determine the vibration response of the oriental melon in frequency ranges of 5 to 150 Hz. The computer program for controlling the vibration shaker and the function generator and measuring the vibration characteristics of the oriental melon was developed. The ranges of resonant frequency and peak acceleration at resonance of the oriental melon were 51 to 73 Hz and 1.24 to 1.92 G-rms, respectively. The resonant frequency and the peak acceleration decreased with the increase of the sample mass, volume, major and minor axes of the oriental melon. Multiple regression models for resonant frequency and peak acceleration of the oriental melon as a function of mass, major axis and minor axis of the sample were developed and analyzed.
직장암환자에서 복회음병합절제술(Miles' operation) 후 발생한 지속적인 배뇨장애의 치료
박희석,김기찬,정호중 고신대학교 의학부 1998 高神大學校 醫學部 論文集 Vol.13 No.1-2
Bladder dysfunction is one of the serious postoperative complications after rectal cancer surgery. To get sufficient objective data and factors for adequate management of bladder dysfunction following rectal cancer surgery, we reviewed medical records of 122 patients who had abdominoperineal resection of rectum (Miles' operation) for rectal cancer. The incidence of bladder dysfunction in 122 rectal cancer patients was 18.9 percent (23 patients). Among 23 patients with bladder dysfunction, 10 patients were referred to our rehabilitation service and their bladder was areflexic type neurogenic bladder at referred time. In 10 patients referred to our rehabilitation service, 8 patients(80.0% got the balanced bladder and 2 patients(20.0% ) failed, and the interval between beginning of bladder training and establishment of balanced bladder in 8 patient was 13.4±6.8 days. In 13 patients did not referred to our service, only 3 patients(23.1% ) got the balanced bladder and 10 patients(76.9%) failed. To improve the life quality of the rectal cancer patients with neurogenic bladder following abdominoperineal resection of rectum, early proper rehabilitative managements including bladder training were should be given.
Kim, Ghi-Seok,Hong, Soon-Sung,Jhang, Kyung-Young,Kim, Geon-Hee 한국정밀공학회 2012 International Journal of Precision Engineering and Vol.13 No.6
In this paper, the low-velocity impact damage in composite laminates was investigated by three NDE (Non-destructive Evaluation) techniques, Electronic Speckle Pattern Interferometry (ESPI), digital shearography and ultrasound C-scan. The objective of this study is to evaluate the detection performance of each NDE technique against low-velocity impact damage in fiber glass composite laminates when the specimen was inspected from front surface (impact side) which may be available in depot level. Unidirection and crossply fiber glass composite laminates were impact damaged with four energy levels (5, 10, 15, 18 J) by drop weight impact machine. The results showed that ESPI and digital shearography techniques were able to identify the barely visible low-velocity impact damage. However, some limitations for detection depth were found in ESPI and digital shearography because the impact damage on reverse side was rarely detected by them. Nonetheless, ESPI and digital shearography techniques were estimated as one of useful NDE methods embedded with improved post processings including image process and optimal calibration method for different excitations.
Correlation Analysis between Ultrasonic Parameters and Elastic Modulus of Apple
Kim, Ghi-Seok,Kim, Ki-Bok,Park, Jeong-Gil,Lee, Sang-Dae,Jung, Hyun-Mo,Kim, Man-Soo The Korean Society for Nondestructive Testing 2008 한국비파괴검사학회지 Vol.28 No.3
The firmness of fruit is one of the most important quality factors and is highly correlated to the elastic modulus. In this study, the ultrasonic transmission method was applied to evaluate the elastic modulus of the apple. In order to transmit and receive the ultrasonic wave through the whole apple, the ultrasonic measurement setup consisted of ultrasonic pulser, two specially fabricated ultrasonic transducers for fruit and digital storage oscilloscope. Ultrasonic parameters such as ultrasonic wave velocity, apparent attenuation, and peak frequencies were analyzed. The elastic modulus of apple was measured by using compression test apparatus. The correlations between ultrasonic parameters and elastic modulus were analyzed. A multiple linear regression model describing the relationship between elastic modulus and ultrasonic parameters was proposed.
Kim, Hui Dong,Kim, Dong Kyu,Chae, Yu-Gyeong,Park, Seok Gyo,Kim, Ghi Chan,Jeong, Ho Joong,Sim, Young-Joo,Ahn, Yeh-Chan Optical Society of Korea 2017 Current Optics and Photonics Vol.1 No.2
To investigate the usefulness of optical coherence tomography (OCT) for imaging lymphedema, we directly compared it to other histological methods in a mouse model of lymphedema. We performed detailed imaging of the lymphedema lesion on a mouse tail. We imaged the mouse tail in vivo with OCT and created histopathological samples. We constructed a spectrometer-based OCT system using a fiber-optic Michelson interferometer. The light was directed to 50:50 couplers that split the light into reference and sample arms. Backscattered light from a reference mirror and the sample produced an interference fringe. An OCT image of the lymphedema model revealed an inflammatory reaction of the skin that was accompanied by edema, leading to an increase in the light attenuation in the dermal and subcutaneous layers. Similar to OCT image findings, histological biopsy showed an inflammatory response that involved edema, increased neutrophils in epidermis and subdermis, and lymphatic microvascular dilatation. Furthermore, the lymphedema model showed an increase in thickness of the dermis in both diagnostic studies. In the mouse tail model of lymphedema, OCT imaging showed very similar results to other histological examinations. OCT provides a quick and useful diagnostic imaging technique for lymphedema and is a valuable addition or complement to other noninvasive imaging tools.
Wavelet Analysis of Ultrasonic Transmitted Signal of Apple during Storage Time
Kim, Ki Bok,Kim, Man Soo,Jung, Hyun Mo,Lee, Sang Dae,Park, Jeong Gil,Kim, Ghi Seok Trans Tech Publications, Ltd. 2006 Key engineering materials Vol.321 No.-
<P>This study was conducted to analyze the ultrasonic transmitted signal for apple using wavelet transform. Fruit consists of non-linear visco-elastic properties such as flesh, an ovary and rind and hence most ultrasonic wave is attenuated and its frequency is shifted during passing the fruit. Thus it was not easy to evaluate the internal quality of the fruit using typical ultrasonic parameters such as wave velocity, attenuation, and frequency spectrum. The discrete wavelet transform was applied to the ultrasonic transmitted signal for apple. The magnitude of the first peak frequency of the wavelet basis from the ultrasonic transmitted signal showed a close correlation to the storage time of apple.</P>
Analysis and Modelling of Vibration Performance for Multi-layered Corrugated Structure
Kim, Jin Nyul,Sim, Jae Min,Park, Min Jung,Kim, Ghi Seok,Kim, Jongsoon,Park, Jong Min Korean Society for Agricultural Machinery 2013 바이오시스템공학 Vol.38 No.4
Purpose: The purpose of this study was to analyze for resonant frequency, vibration transmissibility and damping ratio of multi-layered corrugated structures using a random vibration test. Methods: The random vibration test was performed by the ASTM D4728 specifications using two paperboards (S120, K180) and two types of flutes (A/F, B/F). Damping ratio of the multi-layered corrugated structures was estimated using a theoretical equation derived from the measured resonant frequency and transmissibility. Results: The resonant frequency and vibration transmissibility of the multi-layered corrugated structures of K180 and B-flute were higher than those of S120 and A-flute, respectively; however, the damping ratio of each sample had the opposite tendency. The resonant frequency was inversely proportional to the sample thickness and static stress; vibration transmissibility and damping ratio were not correlated with sample thickness and static stress. In addition, we developed a mathematical model of the resonant frequency with variables of sample thickness and static stress. Conclusions: Results of this study can be useful for environment-friendly and optimal packaging design since vibration has been a key factor in cushioning packaging design.