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The Importance of Femoral Hernia in Children (소아 대퇴탈장의 중요성)

  • Han, Seok-Joo;Choi, Bong-Soo;Han, Ai-Ri;Oh, Jung-Tak;Choi, Seung-Hoon;Hwang, Eui-Ho
    • Advances in pediatric surgery
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    • v.6 no.2
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    • pp.124-127
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    • 2000
  • Femoral hernia is very rare in children and is easily misdiagnosed. During a period of three years, three children with femoral hernia were treated by one pediatric surgeon at Severance Hospital. Only one case was diagnosed correctly before surgery, and the others were thought to be either an indirect inguinal hernia or groin mass. Curative hernioplasty (McVay hernioplasty) could be done in only one case at the time of first operation. Diagnosis of femoral hernia in children is a challenge because of rarity and similarity of clinical presentation to indirect inguinal hernia. Co-incidental findings of indirect inguinal hernia sac or patent processus vaginalis during surgery can perpetuate the misdiagnosis. In case of absence of expected indirect inguinal hernia or apparent recurrence of indirect inguinal hernia, one should consider the possibility of femoral hernia.

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A LONG-TERM FIELD TEST OF A LARGE VOLUME IONIZATION CHAMBER BASED AREA RADIATION MONITORING SYSTEM DEVELOPED AT KAERI

  • Kim, Han-Soo;Ha, Jang-Ho;Park, Se-Hwan;Kim, Jung-Bok;Kim, Young-Kyun;Jin, Hyung-Ho
    • Journal of Radiation Protection and Research
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    • v.34 no.2
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    • pp.77-81
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    • 2009
  • An Area Radiation Monitoring System (ARMS) ionization chamber, which had an 11.8 L active volume, was fabricated and performance-tested at KAERI. Low leakage currents, linearities at low and high dose rates were achieved from performance tests. The correlation coefficients between the ionization currents and the dose rates are 1 at high dose rate and 0.99 at low dose rate. In this study, an integration-type ARMS ionization chamber was tested over a year for an evaluation of its long-term stability at a radioisotope (RI) repository of the Young-gwang nuclear power plant. The standard deviation of dose rate of 1 day data and over a 100-days mean value were 6.2 $\mu$R/h and 2.9 $\mu$R/h, respectively. The fabricated ARMS ionization chamber showed stable performance from the results of the long-term tests. Design and performance characteristics of the fabricated ionization chamber for the ARMS from performance-tests are also addressed.

Learning Methods for Effective Object Tracking in 3D Storytelling Augmented Reality (3D 스토리텔링 증강현실에서 효과적인 객체 추적을 위한 학습 방법)

  • Choi, Dae han;Han, Woo ri;Lee, Yong-Hwan;Kim, Youngseop
    • Journal of the Semiconductor & Display Technology
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    • v.15 no.3
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    • pp.46-50
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    • 2016
  • Recently, Depending on expectancy effect and ripple effect of augmented reality, the convergence between augmented reality and culture & arts are being actively conducted. This paper proposes a learning method for effective object tracking in 3D storytelling augmented reality in cultural properties. The proposed system is based on marker-less tracking, and there are four modules that are recognition, tracking, detecting and learning module. Recognition module is composed of SURF and LSH, and then this module generates standard object information. Tracking module tracks an object using object tracking based on reliability. This information is stored in Learning module along with learned time information. Detecting module finds out the object based on having the best possible knowledge available among the learned objects information, when the system fails to track. Also, it proposes a method for robustly implementing a 3D storytelling augmented reality in cultural properties in the future.

A Vascular Characteristic Index of Blood Pressure Variation using the Pulse Wave Signal

  • Kim, Gi-Ryon;Jung, Dong-Keun;Ye, Soo-Young;Jeon, Gye-Rok
    • Transactions on Electrical and Electronic Materials
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    • v.9 no.5
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    • pp.213-219
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    • 2008
  • Pulse waves continuously change with respect to the characteristics and status of the cardiovascular system and in relation to the blood pressure (BP) and the pulse wave velocity (PWV). Monitoring the vascular condition by analyzing the variations in pulse waveforms has been used to diagnose vascular disorders and in drug treatment of arteriosclerosis and peripheral circulatory obstruction. In this paper, we investigated the vascular characteristic index with regard to the BP and classified by pulse wave signals. The pressure pulse wave and photoplethysmography (PPG) were measured simultaneously while subjects exercised, producing changes in the BP, to analyze the variation in the vascular characteristic index. We investigated the correlation between the BP and vascular characteristic index with regard to the classification methods of the pulse wave. The reflection index (RI) and vascular stiffness index were correlated with the diastolic BP, but no correlation was found between these parameters and the systolic BP. These results suggest the possibility of estimating BP through simple measurements of pulse waves.

Development of Handpiece Moving System (HMS) for Cutting Performance Evaluation of Dental Ultrasonic Surgery Unit (치과용 초음파 수술기의 절삭성능 평가를 위한 핸드피스 이송 시스템 구축)

  • Sa, Min-Woo;Shim, Hae-Ri;Ko, Tae-Jo;Lee, Jong-Min;Kim, Jong Young
    • Journal of the Korean Society for Precision Engineering
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    • v.33 no.5
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    • pp.377-383
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    • 2016
  • Recently, research on bone fracture and osteoplasty using ultrasonic bone surgery unit has been ongoing in the fields of dentistry, plastic surgery, and otorhinolaryngology. However, detailed data evaluation with ultrasonic bone surgery unit has not been conducted to date. In this study, we developed handpiece moving system (HMS) for cutting performance evaluation. In the experimental setup of HMS, a handpiece was immobilized, and bone samples from cortical bone of bovine leg were prepared. Also, the experimental process was described in detail, and a basic experiment was carried out to evaluate the cutting performance. Future study is required on all experimental process conditions by HMS.

Changes in Antioxidant Activity of Rehmannia radix Libosch with Heat Treatment

  • Woo, Koan-Sik;Hwang, In-Guk;Song, Dae-Sik;Lee, Youn-Ri;Lee, Jun-Soo;Jeong, Heon-Sang
    • Food Science and Biotechnology
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    • v.17 no.6
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    • pp.1387-1390
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    • 2008
  • This study evaluated the effects of heat treatment on antioxidant activity of Rehmannia radix Libosch (RRL). RRL was heated at various temperatures ($110-150^{\circ}C$) for various times (1-5 hr), and the total polyphenol, flavonoid content, and antioxidant activity were investigated. With increased heating temperature and exposure time, total content of polyphenol, flavonoid, as well as antioxidant activity increased. The highest total polyphenol and flavonoid contents were 21.65 and 3.56 mg/g, respectively, these values were occurred after heating for 3 hr at $150^{\circ}C$ (RRL was 5.09 and 0.83 mg/g, respectively). The 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity was highest value of 83.46% after heating for 3hr at $150^{\circ}C$. The 2,2-azino-bis-3-ethylbenzothiazoline-6-sulfonic acid (ABTS) cation radical scavenging activity was highest value of 20.43mg ascorbic acid (AA) eq/g after heating for 2 hr at $150^{\circ}C$. There were highly significant differences in the total polyphenol, flavonoid content, and antioxidant activity among heating temperatures and times (p<0.001), with heating temperature having the greater effect.

A Study on the Characteristics of the Biochar by Hydrothermal Carbonization with Food Waste (열수가압탄화법(HTC, Hydrothermal Carbonization)에 의한 음식물 폐기물 biochar의 특성 연구)

  • Cho, Woo Ri;Oh, Minah;Chung, Wonduck;Park, Seong-Kyu;Bae, Sunyoung;Lee, Jai-young
    • Journal of Soil and Groundwater Environment
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    • v.21 no.1
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    • pp.22-27
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    • 2016
  • Hydrothermal carbonization (HTC) is a carbonization method of thermochemical process at a relatively low temperature (180-250℃). It is reacted by water containing raw material. In this study, it was selected for effective disposal method of food waste because food waste in Korea has large amount water. 5 kg, 10 kg, 15 kg of food waste were reacted for 6 hours at 200℃ for selecting the optimum amount of raw material. Since the derived optimum amount, food waste was reacted for 2 hours, 4 hours and 6 hours at 200℃ and 1.5 MPa. After carbonization, it was analyzed to evaluated the properties by ultimate analysis, iodine adsorption, BET surface area and SEM. After analyzing the characteristics, it can be utilized as a basic data for applied.

Dose Effect of Phytosanitary Irradiation on the Postharvest Quality of Cut Flowers

  • Kwon, Song;Kwon, Hye Jin;Ryu, Ju Hyun;Kim, Yu Ri
    • Journal of People, Plants, and Environment
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    • v.23 no.2
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    • pp.171-178
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    • 2020
  • The present study was conducted to determine the effects of electron beam irradiation on the postharvest quality of cut flowers. Cut flowers were irradiated with electron beam at 100, 200, 400, 600, 800, 1,000, and 2,000 Gy with a 10 MeV linear electron beam accelerator to evaluate their irradiation tolerance. Postharvest quality was determined by monitoring fresh weight loss, flower longevity, flower diameter, flowering rate, visual quality of flowers and leaves, and chlorophyll content. Cut flowers showed a radiation-induced damage with increasing the irradiation dose. Flower longevity and fresh weight of cut flowers decreased when the irradiation dose was increased. Flower bud opening was also inhibited in a dose-dependent manner. The effective irradiation doses for 10% reduction of postharvest quality (ED10) values were 144.4, 451.6, and 841.2 Gy in the 'Medusa' lily, 'Montezuma' carnation, and 'Rosina White' eustoma, respectively. Although tolerance of cut flowers to electron beam irradiation vary according to species, cultivars, or maturity stage conditions, it is conceivable that 'Montezuma' carnation and 'Rosina White' eustoma could be tolerated and maintained overall postharvest quality up to 400 Gy, the generic irradiation dose approved by the Animal and Plant Health Inspection Service (APHIS) and the International Plant Protection Convention (IPPC) for postharvest phytosanitary treatments.

In vitro antimicrobial properties of Bacillus subtilis KCTC 1326 for fish bacterial disease management

  • Ji-Yoon Park;In-Joo Shin;So-Ri Han;Sung-Hyun Kim;Youhee Kim;Se Ryun Kwon
    • Journal of fish pathology
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    • v.37 no.1
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    • pp.37-48
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    • 2024
  • This study evaluated in vitro antimicrobial properties of Bacillus subtilis KCTC 1326 as an environmentally friendly alternative to antibiotics. B. subtilis KCTC 1326 was characterized on biochemical properties and antibiotics susceptibility. It exhibited antimicrobial effects against all 12 species of fish bacteria used in this experiment. Among them, the largest antibacterial zone was observed for Streptococcus parauberis (34 mm), while the smallest antibacterial zone was observed for Citrobacter freundii (8 mm). Additionally, in the co-culture inhibitory assay of B. subtilis and Edwardsiella piscicida, the growth of E. piscicida was suppressed with increasing concentrations of B. subtilis KCTC 1326, with complete inhibition observed at 107 and 108 CFU/mL of B. subtilis KCTC 1326 after 24 hours of incubation. Moreover, at 48 hours of incubation, the growth of E. piscicida was inhibited across all concentration ranges of B. subtilis KCTC 1326. Therefore, this study indicated the utilizing of B. subtilis KCTC 1326 as an antimicrobial for controlling fish bacterial diseases.

Performance Evaluation of K-based Solid Sorbents Depending on the Internal Structure of the Carbonator in the Bench-scale CO2 Capture Process (벤치급 CO2 포집공정에서 흡수반응기의 내부구조에 따른 K-계열 고체흡수제의 성능평가)

  • Kim, Jae-Young;Lim, Ho;Woo, Je Min;Jo, Sung-Ho;Moon, Jong-Ho;Lee, Seung-Yong;Lee, Hyojin;Yi, Chang-Keun;Lee, Jong-Seop;Min, Byoung-Moo;Park, Young Cheol
    • Korean Chemical Engineering Research
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    • v.55 no.3
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    • pp.419-425
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    • 2017
  • In this study, the performance characteristics of the K-based sorbents (KEP-CO2P2, KEPCO RI, Korea) has been studied in relation with the heat exchanger structure and shape in a mixing zone of the carbonator in the bench-scale dry $CO_2$ capture process. Two types of heat exchangers (different structure and shape) were used in the carbonator as CASE 1 and CASE 2, in which the experiment has been continuously performed under the same operating conditions. During the continuous operation, working temperature of carbonator was 75 to $80^{\circ}C$, that of regenerator was 190 to $200^{\circ}C$, and $CO_2$ inlet concentration of the feed gas was 12 to 14 vol%. Especially, to compare the dynamic sorption capacity of sorbents, the differential pressure of the mixing zone in the carbonator was maintained around 400 to 500 mm $H_2O$. Also, solid samples from the carbonator and the regenerator were collected and weight variation of those samples was evaluated by TGA. The $CO_2$ removal efficiency and the dynamic sorption capacity were 64.3% and 2.40 wt%, respectively for CASE 1 while they were 81.0% and 4.66 wt%, respectively for CASE 2. Also, the dynamic sorption capacity of the sorbent in CASE 1 and CASE 2 was 2.51 wt% and 4.89 wt%, respectively, based on the weight loss of the TGA measurement results. Therefore, It was concluded that there could be a difference in the performance characteristics of the same sorbents according to the structure and type of heat exchanger inserted in the carbonator under the same operating conditions.