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ML 기법에 기반을 둔 측정치 융합기법을 가진 다중표적 방위각 추적 알고리즘
류창수(Chang-Soo Ryu),박주태(Ju-Tae Park),최성운(Sung-Un Choi) 한국산업융합학회 2003 한국산업융합학회 논문집 Vol.6 No.3
Recently, Ryu et al. proposed a multiple target DOA tracking algorithm, which has good features that it has no data association problem and simple structure. But its performance is seriously degraded in the low signal-to-noise ratio. In this paper, a measurement fusion method is presented based on ML(Maximum Likelihood), and the new DOA tracking algorithm is proposed by incorporating the presented fusion method into Ryu's algorithm. The proposed algorithm has a better tracking performance than that of Ryu's algorithm, and it sustains the good features of Ryu's algorithm.
Ryu, Seungmi,Yoo, Jin,Jang, Yeongseon,Han, Jin,Yu, Seung Jung,Park, Jooyeon,Jung, Seon Yeop,Ahn, Kyung Hyun,Im, Sung Gap,Char, Kookheon,Kim, Byung-Soo American Chemical Society 2015 ACS NANO Vol.9 No.10
<P>Coculturing stem cells with the desired cell type is an effective method to promote the differentiation of stem cells. The features of the membrane used for coculturing are crucial to achieving the best outcome. Not only should the membrane act as a physical barrier that prevents the mixing of the cocultured cell populations, but it should also allow effective interactions between the cells. Unfortunately, conventional membranes used for coculture do not sufficiently meet these requirements. In addition, cell harvesting using proteolytic enzymes following coculture impairs cell viability and the extracellular matrix (ECM) produced by the cultured cells. To overcome these limitations, we developed nanothin and highly porous (NTHP) membranes, which are ∼20-fold thinner and ∼25-fold more porous than the conventional coculture membranes. The tunable pore size of NTHP membranes at the nanoscale level was found crucial for the formation of direct gap junctions-mediated contacts between the cocultured cells. Differentiation of the cocultured stem cells was dramatically enhanced with the pore size-customized NTHP membrane system compared to conventional coculture methods. This was likely due to effective physical contacts between the cocultured cells and the fast diffusion of bioactive molecules across the membrane. Also, the thermoresponsive functionality of the NTHP membranes enabled the efficient generation of homogeneous, ECM-preserved, highly viable, and transfer-printable sheets of cardiomyogenically differentiated cells. The coculture platform developed in this study would be effective for producing various types of therapeutic multilayered cell sheets that can be differentiated from stem cells.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2015/ancac3.2015.9.issue-10/acsnano.5b03823/production/images/medium/nn-2015-038237_0012.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn5b03823'>ACS Electronic Supporting Info</A></P>
Sung-Hee Han,Young-Ho Yang,Jae-Song Ryu,Myung-Soo Kang,Young-Jin Kim,Kyoung-Ryul Lee 대한의학유전학회 2015 대한의학유전학회지 Vol.12 No.2
Purpose: Noninvasive prenatal test (NIPT) by massively parallel sequencing (MPS) of cell-free fetal DNA in maternal plasma marks a significant advancement in prenatal screening, minimizing the need for invasive testing of fetal chromosomal aneuploidies. Here, we report the initial clinical performance of NIPT in Korean pregnant women. Materials and Methods: MPS-based NIPT was performed on 910 cases; 5 mL blood samples were collected and sequenced in the Shenzhen BGI Genomic Laboratory to identify aneuploidies. The risk of fetal aneuploidy was determined by L-score and t-score, and classified as high or low. The NIPT results were validated by karyotyping for the high-risk cases and neonatal follow-up for low-risk cases. Results: NIPT was mainly requested for two clinical indications: abnormal biochemical serum-screening result (54.3%) and advanced maternal age (31.4%). Among 494 cases with abnormal biochemical serum-screening results, NIPT detected only 9 (1.8%) high-risk cases. Sixteen cases (1.8%) of 910 had a high risk for aneuploidy: 8 for trisomy 21, 2 for trisomy 18, 1 for trisomy 13, and 5 for sex chromosome abnormalities. Amniocentesis was performed for 7 of these cases (43.8%). In the karyotyping and neonatal data, no false positive or negative results were observed in our study. Conclusion: MPS-based NIPT detects fetal chromosomal aneuploidies with high accuracy. Introduction of NIPT as into clinical settings could prevent about 98% of unnecessary invasive diagnostic procedures.
Preliminary Design of Structural Health Monitoring for High-Rise Buildings
Ryu, Hyun-hee,Kim, Jong-soo,Choi, Eun-gyu,Lee, Sang-hoon Council on Tall Building and Urban Habitat Korea 2017 International journal of high-rise buildings Vol.6 No.3
The purpose of structural health monitoring is to evaluate structural behavior due to various external loads through installation of appropriate measurement. Accordingly, a guideline for monitoring standards is necessary to evaluate the safety and performance of a structure. This paper introduces preliminary design of SHM for high-rise buildings, which is the stage creating a guideline. As for preliminary design of SHM, first step is to calculate the displacement and member force through structural analysis. After that, limitations or qualifications are proposed for management. Secondly, based on the results from first step, issues related monitoring such as monitoring method, measurement type, or installation location are determined. This method leads building managers to reasonably define the structural safety over the whole life cycle. Furthermore, this experience contributes to development of SHM forward and it is expected to be useful for other types of structures as well such as spatial structures or irregular buildings.
Usability Evaluation of an Image-based Pill Identification Application
( Soo-kyung Cho ),( Bora Kim ),( Eunohk Park ),( Jieun Kim ),( Hokyoung Ryu ),( Yoon-kyoung Sung ) 대한류마티스학회 2019 대한류마티스학회지 Vol.26 No.2
Objective. To measure the accuracy and usability of an the image-processing based pill identifier application that we have developed. Methods. The subjects selected were medical residents and nurses. Five nurses and five physicians were randomly assigned to use either an the image-processing based pill identifier application (n=10), or the conventional pill identifier application (n=10). They were instructed to examine 10 pills using the application assigned to them, and searches that took <3 minutes to find candidate drugs were recognized as successes. Among these successful searches, the accuracy was defined to identify the correct names of the drugs and the times needed in the correctly identifications were also measured. After using one application the subjects were instructed to use the other one and repeat the same process. Finally, they answered a questionnaire on the usability of the applications. Results. The average proportion searches completed within 3 minutes was 91% for the the image-processing based pill identifier application, slightly, but not significantly, higher than that for the conventional pill identifier application (85%). The accuracies of the the image-processing based and conventional pill identifier applications were similar, 89% and 83%, respectively. In the usability examination, the the image-processing based pill identifier application yielded higher scores for the desirable, usable, findable and useful qualities than the conventional pill identifier application. Conclusion. The the image-processing based pill identifier application application has a similar accuracy to the existing conventional pill identifier application, and its usability was also found to be good. (J Rheum Dis 2019;26:111-117)
An analysis of characteristics of pigmented fungiform papillae of the tongue: single center study
( Sung-min Park ),( Tae-wook Kim ),( Hyun-joo Lee ),( Hyunju Jin ),( Hyang-suk Ryu ),( Woo-haing Shim ),( Gun-wook Kim ),( Byung-soo Kim ),( Hyun-chang Ko ),( Moon-bum Kim ),( Hoon-soo Kim ) 대한피부과학회 2017 대한피부과학회 학술발표대회집 Vol.69 No.2
Background: Pigmented fungiform papillae of the tongue (PFPT) is a rare benign pigmentary disorder of the tongue. In dark-skinned individuals, PFPT appears to be relatively common. However, limited data exist on PFPT in Korean patients. Objectives: To investigate the clinical characteristics of PFPT in Korean patients Methods: Patients diagnosed with PFPT between 1995 and 2016 at Pusan National University Hospital were included. Clinical characteristics of PFPT, dermoscopic findings, and comorbidities were reviewed. Results: Eighteen patients diagnosed as PFPT were enrolled. Male to female ratio was 1 : 5. The mean age at diagnosis was 39.6 years (range, 8-65 years). According to Holzwanger’s classification, type I was the most common (88.9%). PFPT was commonly concomitant with pigmentary disorders including mucosal melanotic macules, Laugier-Hunziker syndrome, Melasma, and melanonychia (6/18, 33.3%). Preceding oral inflammatory lesions were found in 3 patients (16.7%), and systemic diseases and infectious diseases existed in 2 patients respectively (11.1%). Dermoscopic examination was performed in 7 patients; Pigmented border with dichotomized vessels (Rose petal pattern, 71.4%), and diffuse pigmentation (cobblestone pattern, 57.1%) were common findings. Conclusion: Our study shows PFPT can coexist with pigmentary disorder. Female predominance, concomitant pigmentary disorders of PFPT shows sex hormone or susceptibility to abnormal pigmentation may play a role in pathogenesis of PFPT.