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Polymer-Based Flexible Visuo-Haptic Display
Sungryul Yun,Suntak Park,Bongjae Park,Seung Koo Park,Prahlad, Harsha,Von Guggenberg, Philip,Ki-Uk Kyung IEEE 2014 IEEE/ASME transactions on mechatronics Vol.19 No.4
<P>We report a flexible visuo-haptic display that allows for interactive haptic feedback on the visual display. The visuo-haptic display is fabricated by integrating a dielectric elastomer (DE) based thin film actuator array into a flexible display and pressure sensors. The DE actuator array consists of nine active cells, which generate thickness-mode deformation in response to voltage signal. The flexible display presents images of the aligned three alphabet characters at each section in 3 × 3 matrix during light propagation via optical multiwaveguide. The pressure sensors are placed on the bottom of the DE actuator array for haptic feedback. The performance of the DE actuators is proved to be capable of realizing sufficient vibro-tactile sensation in the perceivable range of human touch sense. The integrated system enables the visual display to provide interactive haptic feedback such as key pressing, contact vibration sensations, etc., in accordance with user input.</P>
Sungryul Shim,Byung-Ho Yoon,In-Soo Shin,Jong-Myon Bae 한국역학회 2017 Epidemiology and Health Vol.39 No.-
This review aimed to arrange the concepts of a network meta-analysis (NMA) and to demonstrate the analytical process of NMA using Stata software under frequentist framework. The NMA tries to synthesize evidences for a decision making by evaluating the comparative effectiveness of more than two alternative interventions for the same condition. Before conducting a NMA, 3 major assumptions—similarity, transitivity, and consistency—should be checked. The statistical analysis consists of 5 steps. The first step is to draw a network geometry to provide an overview of the network relationship. The second step checks the assumption of consistency. The third step is to make the network forest plot or interval plot in order to illustrate the summary size of comparative effectiveness among various interventions. The fourth step calculates cumulative rankings for identifying superiority among interventions. The last step evaluates publication bias or effect modifiers for a valid inference from results. The synthesized evidences through five steps would be very useful to evidence-based decision-making in healthcare. Thus, NMA should be activated in order to guarantee the quality of healthcare system.
Sungryul Park,Myoungouk Park,Joonwoo Son 대한인간공학회 2018 대한인간공학회 학술대회논문집 Vol.2018 No.5
Objective: This paper aims to propose basic take-over scenarios for evaluating human factors experimental design in take-over situation to assess take-over performance on conditional automated driving. Background: In the autonomous driving environment of SAE level 3, some studies have been conducted to ensure the safety of takeover situations. However, it is necessary to develop a basic scenario that can represent the transition situation for integrating and analyzing the results of individual studies. Method: The literature review was conducted focusing on the element, traffic complexity before the transition referring to our previous classification results. Results: The inclusion criteria for developing the scenarios were road type and event. Four types of basic take-over scenarios have been proposed in this study; straight road-missing lane marking, curved road-missing lane marking, straight road-unexpected external obstacle, and straight road-system failure. Application: The results of this study can contribute to designing an experiment to evaluate safety before control in the event of a conditional automatic (Level 3) in the future.
Opioid-induced hyperalgesia after implantation of intrathecal morphine pump: a case report
Sungryul Yoon,Rakmin Choi,Jaedo Lee,Jongchan Won,Bousung Lee,Kwanghaeng Lee,Dongseok Kim,Jaeyoung Yang 조선대학교 의학연구원 2020 Medical Bilogical Science and Engineering Vol.3 No.2
Opioid-induced hyperalgesia is characterized by an increased pain response to noxious stimuli despite increased use of opioid medications. Here, we report the case of a 43-year-old woman diagnosed with post-laminectomy syndrome who presented with an increasing pain score following a morphine infusion via an implanted intrathecal drug delivery device. Her pain improved after reducing opioid doses and the administration of intravenous ketamine infusion therapy. Thus, the early suspicion of opioid-induced hyperalgesia is essential for patients with increasing pain refractory to augmented doses of opioid medications.
Meta-analysis for genome-wide association studies using case-control design:
Sungryul Shim,Jiyoung Kim,Wonguen Jung,In-Soo Shin,Jong-Myon Bae 한국역학회 2016 Epidemiology and Health Vol.38 No.-
This review aimed to arrange the process of a systematic review of genome-wide association studies in order to practice and apply a genome-wide meta-analysis (GWMA). The process has a series of five steps: searching and selection, extraction of related information, evaluation of validity, meta-analysis by type of genetic model, and evaluation of heterogeneity. In contrast to intervention meta-analyses, GWMA has to evaluate the Hardy–Weinberg equilibrium (HWE) in the third step and conduct meta-analyses by five potential genetic models, including dominant, recessive, homozygote contrast, heterozygote contrast, and allelic contrast in the fourth step. The ‘genhwcci’ and ‘metan’ commands of STATA software evaluate the HWE and calculate a summary effect size, respectively. A meta-regression using the ‘metareg’ command of STATA should be conducted to evaluate related factors of heterogeneities.
Influences of Large Flexible Display Curvature on Legibility and Visual Fatigue
( Sungryul Park ),( Jihhyeon Yi ),( Donghee Choi ),( Gyouhyung Kyung ),( Seungbae Lee ),( Byeonghwa Choi ) 한국감성과학회 2014 춘계학술대회 Vol.2014 No.-
The aim of the current study was to examine if legibility and visual fatigue are affected by display curvature. Twenty four subjects (13 males and 11 females) who had visual acuity > 0.8 and passed a color-blind test were participated in the current study. Their mean (SD) age was 21.7 (1.12) years [male: 21.10 (1.29), female: 21.00 (1.41)], and their mean (SD) visual acuity for the left and right eyes was 1.1 (0.27) and 1.05 (0.21), respectively. Each subject was asked to do a visual searching task that is counting the number of letter ``A`` while reading a pseudo-text. Four radii of curvature were used (400mm, 600mm, 1200mm, and flat condition), and visual distance was set to 500 mm. The error rate of finding letter ``A`` and the text reading speed were measured to assess legibility. The ECQ (Eye Complaint Questionnaire) was administered before and after each visual searching task to assess visual fatigue. Results indicated that legibility and visual fatigue improved when curved display was used. These results can be used as guidelines for determining the optimal range of flexible display curvature from the visual ergonomics perspective.