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Optimum Design on Medical Screw Threads with Osseointegration
Nuri Yoo,Min-Gyo Jeong 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Medical screws are widely used in Orthopedics and Dental implants. The demanding property of medical screws is mechanical stability and biocompatibility. Though these properties are met, patients are still suffering and get revision surgery. This research focuses on Osseointegration of medical screws. Osseointegration; the structural connection between medical screw threads and living bone is more than just a natural phenomenon but a great indicator of surgery success. Current medical screws do not perfectly satisfy the osseointegration feature. The aim of this research is to analyze current Ti-based alloys of medical screws through ANSYS computer simulation, find which property is crucial in osseointegration, and make the optimized design of medical screw threads. This research concluded that when using innovative alloys and this optimized design, patients can reach osseointegration faster and reduce bone deletion volume.
Path-Following Navigation Network Using Sparse Visual Memory
Hwiyeon Yoo,Nuri Kim,Jeongho Park,Songhwai Oh 제어로봇시스템학회 2020 제어로봇시스템학회 국제학술대회 논문집 Vol.2020 No.10
Following a demonstration path without observing exact location of an agent is a challenging navigation problem. Especially, considering the probabilistic transition function of the agent makes the problem hard to solve with an exact action decision, so learning-based approaches have been used to solve this task. For example, a previous method by Kumar and Gupta et al., robust path following network (RPF), is a neural-network-based method using visual memories of the demonstration. Although the RPF shows good performances on the path-following task, it does not consider the efficiency of the visual memory since it requires the entire visual memory of the demonstration. In this paper, we propose a path-following network using sparse memory of the demonstration path that can deal with various sparsity of the visual memory. For each time step, the proposed network makes soft attention on the sparse memory to control the agent. We test the proposed model on the Habitat simulator using MatterPort3D dataset with various sparsity of memory. The experimental results show that the proposed method achieves 81.9% of success rate and 73.7% of SPL on a model with 0.8 memory sparsity, and also the results of the models with other memory sparsity achieve reasonable performances compare to the baseline methods.
Lee, Nuri,Kim, Ji-Eun,Gu, Ja-Yoon,Yoo, Hyun Ju,Kim, Inho,Yoon, Sung-Soo,Park, Seonyang,Han, Kyou-Sup,Kim, Hyun Kyung YEAR Wolters Kluwer Health, Inc. All rights reserv 2016 Blood coagulation & fibrinolysis Vol.27 No.1
<P>Disseminated intravascular coagulation (DIC) is characterized by consumption of coagulation factors and anticoagulants. Thrombin generation assay (TGA) gives useful information about global hemostatic status. We developed a new TGA system that anticoagulant addition can deplete thrombin generation in plasma, which may reflect defective anticoagulant system in DIC. TGAs were measured on the calibrated automated thrombogram with and without thrombomodulin or protein Z in 152 patients who were suspected of having DIC, yielding four parameters including lag time, endogenous thrombin potential, peak thrombin and time-to-peak in each experiment. Nonsurvivors showed significantly prolonged lag time and time-to-peak in TGA-protein Z system, which was performed with added protein Z. In multivariate Cox regression analysis, lag time and time-to-peak in TGA system were significant independent prognostic factors. In TGA-protein Z system, lag time and time-to-peak were revealed as independent prognostic factors of DIC. Protein Z addition could potentiate its anticoagulant effect in DIC with poor prognosis, suggesting the presence of defective protein Z system. The prolonged lag time and time-to-peak in both TGA and TGA-protein Z systems are expected to be used as independent prognostic factors of DIC. Blood Coagul Fibrinolysis 27: 84-89 Copyright (C) 2016 Wolters Kluwer Health, Inc. All rights reserved.</P>
Seong Won Jeon,Nuri Lee,Ki Hong Lee,Minjeong Ha,Changhyun Kim,Yoo Ri Kim,Nam Sik Yoon,Hyung Wook Park 대한내과학회 2024 The Korean Journal of Internal Medicine Vol.39 No.3
Background/Aims: The SAMe-TT2R2 score is used for assessing anticoagulation control (AC) quality with warfarin. However, it is hard to apply SAMe-TT2R2 score in Asian patients with atrial fibrillation (AF), because it has not been proven in those populations. This study aimed to validate the SAMe-TT2R2 score in Asian patients with AF and suggest a modified SAMe- TT2R2 score for this population. Methods: We analyzed 710 Korean patients with AF who were using warfarin. The AC quality was assessed as the mean time in therapeutic range (TTR). Each component of SAMe-TT2R2 score was evaluated for the relationship with AC. Further clinical factors that predict AC were analyzed. Identified factors were re-assorted and constructed as SA2Me-TTR scoring system. Results: Of the components of the SAMe-TT2R2 score, female, age, and rhythm control were associated with AC. Heart failure and renal insufficiency were newly identified factors associated with AC. The modified SA2Me-TTR score was reconstructed with the relevant risk factors (S, female gender, 1 point; A, age < 60 yr, 2 points; Me, medical history of heart failure, 1 point; T, treatment for rhythm control, 1 point; T, history of stroke or transient ischemic attack, 1 point; R, renal insufficiency, 1 point). The modified SA2Me-TTR score demonstrated an excellent relationship with the grading of AC. The modified SA2Me-TTR score ≤ 1 identified patients with good AC (hazard ratio 2.46, 95% CI 1.75–3.47). Conclusions: The modified SA2Me-TTR score was useful for guiding oral anticoagulants selection in Asian patients with AF.
Kim Sukyung,Kim Minji,Kim Jiwon,Park Boram,Min Nuri,Jung Minyoung,Yu Seoyoung,Lee Ji Young,Yoo Hye Won,Kim Hye-Young,Ahn Kangmo,Kim Jihyun 대한천식알레르기학회 2023 Allergy, Asthma & Immunology Research Vol.15 No.1
Purpose: This study aimed to evaluate the reliability and validity of the Korean version of the Food Allergy Quality of Life Questionnaire-Parent Form (K-FAQLQ-PF) and to identify clinical characteristics related to low quality of life (QoL) in Korean children with food allergy (FA). Methods: Parents of 0–12-year-old patients with FA were enrolled. The English version of FAQLQ-PF was translated into Korean. Construct validation was confirmed by the Food Allergy Independent Measure-Parent Form (FAIM-PF) and the Child Health Questionnaire Parent Form 28 (CHQ-PF28). Logistic regression analyses were used to evaluate associations between potential risk factors and QoL outcomes. Results: A total of 182 patients with a median age of 5.0 years were enrolled in the study. Cronbach’s α coefficient values indicating internal consistency were higher than 0.8. Intraclass correlation coefficient values for test-retest reliability were good for all age groups (r > 0.6). Total K-FAQLQ-PF scores were positively correlated with the FAIM-PF (r = 0.56, P < 0.05) and were negatively correlated with the parental impact-emotional domain in the CHQ-PF28 (r = −0.44, P < 0.05). In multivariable logistic regression analysis, low QoL was significantly associated with female sex (adjusted odds ratio [aOR], 2.07; 95% confidence interval [CI], 1.03–4.18), age ≥ 5 years (aOR, 2.84; 95% CI, 1.31–6.16), FA diagnosis before the age of 3 years (aOR, 3.96; 95% CI, 1.13–13.93), the presence of atopic dermatitis (aOR, 2.21; 95% CI, 1.07–4.57), and residence in non-metropolitan areas (aOR, 3.44; 95% CI, 1.73–6.85). Conclusions: According to parental perceptions, the K-FAQLQ-PF is a valid and reliable tool to assess psychosocial QoL in Korean children with FAs. Age, sex, residential area, and comorbid AD can affect the QoL of pediatric patients with FA.