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Cheon, Kyeong-Jun,Cho, Seoung-Won,Jang, Won-Seok,Kim, Ju-Won,Yang, Byoung-Eun Korean Association of Maxillofacial Plastic and Re 2020 Maxillofacial Plastic Reconstructive Surgery Vol.42 No.-
Background: Various types of miniplates have been developed and used for the reduction of facial bone fractures. We introduced Yang's Keyhole (YK) plate, and reported on its short-term stability. The purpose of this study was to evaluate the long-term stability of the YK plate, as a follow-up study, by examining the patients who had used the YK plate among the patients with the reduction of mandible fractures and who visited for plate removal. Methods: We reviewed the medical records of 16 patients who underwent mandibular fracture fixation using a YK plate (group I) and 17 patients who underwent mandibular fracture fixation using a conventional plate (group II). Assessment was then made on malunion, occlusal stability, discomfort during the application, and clinical symptoms. Results: From January 2015 to December 2017, a total of 36 patients underwent mandibular fracture surgery using a YK plate. A total of 16 patients received plate removal. Among them, 15 were male and 1 female. The average age was 26 years. The applied surgical sites were the 12 on mandibular angle, 4 on mandibular symphysis, and 2 on subcondyle. The application period of YK plate was an average of 335 days. During the same period, 45 people underwent surgery on the conventional plate. A total of 17 patients received plate removal. Among them, 15 were male and 2 females. The average age was 36 years. The applied surgical sites were the 8 on mandibular angle, 4 on mandibular symphysis, and 2 on subcondyle. The application period of the conventional plate was an average of 349 days. No malocclusion occurred at the time of removal, and occlusion was stable. No patient complained of joint disease or discomfort. Conclusion: The YK plate system, in which the screw was first inserted and the plate was applied, for clinical convenience did not cause any particular problem and no significant difference from the conventional plate.
Economic Operation of a Data Backup Scheme for Computer Systems under Disastrous Information Threats
Won Seok Yang,Nam K. Kim 대한산업공학회 2017 Industrial Engineeering & Management Systems Vol.16 No.3
In this paper, we deal with the economic operation of a data backup scheme for various computer systems under disastrous information threats. To this end, we introduce a queueing model that combines disasters and two-stage queues. Making use of the matrix-geometric approach, we obtain its steady-state probabilities. From these results, we compute the average total cost with a recovery cost and a backup cost taken into account. With sample numerical results, we investigate the optimal backup operation that minimizes the average total cost.
Identification of Transformed Image Using the Composition of Features
Yang, Won-Keun,Cho, A-Young,Cho, Ik-Hwan,Oh, Weon-Geun,Jeong, Dong-Seok Korea Multimedia Society 2008 멀티미디어학회논문지 Vol.11 No.6
Image identification is the process of checking whether the query image is the transformed version of the specific original image or not. In this paper, image identification method based on feature composition is proposed. Used features include color distance, texture information and average pixel intensity. We extract color characteristics using color distance and texture information by Modified Generalized Symmetry Transform as well as average intensity of each pixel as features. Individual feature is quantized adaptively to be used as bins of histogram. The histogram is normalized according to data type and it is used as the signature in comparing the query image with database images. In matching part, Manhattan distance is used for measuring distance between two signatures. To evaluate the performance of the proposed method, independent test and accuracy test are achieved. In independent test, 60,433 images are used to evaluate the ability of discrimination between different images. And 4,002 original images and its 29 transformed versions are used in accuracy test, which evaluate the ability that the proposed algorithm can find the original image correctly when some transforms was applied in original image. Experiment results show that the proposed identification method has good performance in accuracy test. And the proposed method is very useful in real environment because of its high accuracy and fast matching capacity.
Won, Cheolhee,Lee, Chang Seok,Lee, Jin-Ku,Kim, Tack-Joong,Lee, Kwang-Ho,Yang, Young Mok,Kim, Yong-Nyun,Ye, Sang-Kyu,Chung, Myung-Hee Potamitis Press 2010 Anticancer research Vol.30 No.2
<P>The initiation and growth of hepatocellular carcinoma (HCC) are closely linked to chronic inflammation. Not only is cyclin D1 overexpressed, but it is also related to aggressive progression in HCC. However, the mechanism of expression cyclin D1, a cell-cycle regulator of paramount importance, in the tumor microenvironment remains unknown. Here, we investigated the mechanism of cyclin D1 expression induced by interleukin-6 (IL-6) and whether 3-[3,4-dihydroxy-phenyl]-acrylic acid 2-[3,4-dihydroxy-phenyl]-ethyl ester (CADPE), a derivate of caffeic acid, suppresses cyclin D1 expression. CADPE significantly inhibited IL-6-induced signal transducer and activator of transcription 3 (STAT3) activity in the Huh7 HCC cell line and attenuated IL-6-induced cyclin D1 transcription. Moreover, overexpression of constitutively active STAT3 increased cyclin D1 transcriptional activity and protein expression, whereas overexpression of a dominant-negative STAT3 deletion mutant (STAT3 (1-588)) reduced cyclin D1 transcriptional activity. In addition, CADPE effectively deacetylated histone 4 and prevented STAT3 recruitment to the cyclin D1 promoter, consistent with a role for the CADPE target, STAT3, in the regulation of cyclin D1 transcription. Collectively, these results indicate that CADPE suppresses cyclin D1 expression in HCC cells by blocking both IL-6-mediated STAT3 activation and recruitment of STAT3 to the cyclin D1 promoter.</P>
Yang, Hun-Mu,Woo, Yong-Je,Won, Sung-Yoon,Kim, Da-Hye,Hu, Kyung-Seok,Kim, Hee-Jin Mutaz B. Habal, MD 2009 JOURNAL OF CRANIOFACIAL SURGERY - Vol.20 No.5
The aim of this study was to elucidate the sublingual and intralingual courses of the lingual nerve (LN) in the ventral tongue region, providing a clinical guide for safe surgical procedures such as frenectomy. We evaluated 16 specimens (32 sides) by gross observation after detailed dissections, and a further 6 specimens were examined after Sihler staining. All specimens were harvested from embalmed Korean cadavers. We classified the innervation patterns of the LN into 5 types and confirmed the distribution of the LN in the tip of the tongue. The classification of the LN was made with reference to a line formed by the interlacing of the styloglossus and genioglossus muscles. Based on the course of LN and the presence of a tiny twig (twigs directly innervating the ventral mucosa of the tongue, TM) directly innervating the sublingual mucosa, the course of the LN was classified as being straight, curved, or vertical and with or without the TM. Straight, curved, and vertical courses without the TM were seen in 9.4%, 46.9%, and 18.8% of the cases, respectively. Straight and curved courses with the TM were observed in 6.3% and 18.8% of the cases, respectively. Sihler staining revealed that the tongue tip is innervated by the LN. These findings indicate that surgical manipulations at the ventral tongue region might damage the LN and result in numbness of the tongue tip, and provide a useful anatomic reference for various surgical procedures involving the ventral tongue region.