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Development of a 25-DOF Hand Forward Kinematic Model Using Motion Data
Xiaopeng Yang,Kihyo Jung(정기효),Jangwoon Park(박장운),Heecheon You(유희천) 대한인간공학회 2010 대한인간공학회 학술대회논문집 Vol.2010 No.10
This paper describes the development of a 25-DOF hand forward kinematic model based on optical motion capture data. In the proposed model, an evolutionary strategy method (ESM)-based optimization algorithm is proposed to determine hand link lengths based on measured surface marker motions in vivo. The Denavit-Hartenberg (D-H) method was employed to predict fingertip positions given hand postures. To evaluate the proposed model, an experiment was conducted in which a 3D motion analysis system was employed to measure the 3D positions of spherical retro-reflective markers placed at the hand surface landmarks during grasping a ball with a diameter of 50 ㎜. The predicted fingertip positions by the model were compared with those measured by a motion capture system. Compared with the SANTOSTM hand model, the proposed model had a smaller grand mean value of fingertip position prediction error (5.8 ㎜ for SANTOS and 2.7 ㎜ for the proposed model). The proposed model can be applied to computer-aided ergonomic design of hand-held devices.
Yang Mi,Jingyu Wang,Jinfeng Wu,Xiaopeng Wang,Bin Yang,Ruimin Ren,Yangang Zhang,Xiaobin Yuan,Xuhui Zhang 대한비뇨의학회 2022 Investigative and Clinical Urology Vol.63 No.1
Purpose: Bulbar injury is the most common type of urethral injury. This study investigated the efficacy and safety of a novel technique, local urethral flushing, in preventing stricture formation after blunt bulbar urethra injuries. Materials and Methods: This retrospective study included 205 males diagnosed with straddle injury-induced bulbar urethra injury at the Shanxi Bethune Hospital and First Hospital of Shanxi Medical University between January 2015 and January 2019. Patients were diagnosed by retrograde urethrography and classified as partial or complete urethral rupture according to the urethral integrity after injury. Complete urethral rupture patients received suprapubic cystostomy and received urethroplasty 3 months later. Patients with partial urethral rupture underwent endoscopic urethral realignment by cystoscopic guide-wire guided catheterization. Patients with both injury types were divided into 3 groups. The treatment groups received urethral flushing with 0.05% dexamethasone through a secondary ureteral catheter that locked at the urethral lesion. The blank control groups received normal saline. The negative control groups had only a single ureteral catheter placed. Patients were assessed for pain during catheterization, infection, and stenosis, and followed for at least 2 years. Results: Stenosis rates and length were significantly reduced in the normal saline groups, and even further reduced in the dexamethasone groups. The negative control groups had significantly higher infection rates than patients in the dexamethasone or saline groups. Conclusions: Local urethral flushing with dexamethasone could significantly decrease urethral stenosis rates and severity without increasing patients’ discomfort or infection risk.
Xiaopeng Yang,Lei Chen,Kihyo Jung,Heecheon You 대한인간공학회 2020 大韓人間工學會誌 Vol.39 No.1
Objective: This study aimed to provide a comprehensive review of literature on 3D and 4D scanning technologies and potential applications of 4D scanning techniques in ergonomic product design. Background: Dynamic anthropometric data is needed to consider the changes of human body dimensions while using a product in the product design process. Method: A literature review was conducted on 34 papers which were selected by the process of title screening, abstract screening, and full text screening. Results: 3D scanning techniques can be classified into three catalogs: laser, structured light, and stereo photogrammetry. Though still challenging, 4D scanning systems self-built or commercialized have been developed. 4D scanning systems have been applied to understanding foot-shape changes and foot kinematics during walking, analyzing human facial movements, and evaluating the fit of sportswear design. Conclusion: 4D scanning systems have great potential in design and evaluation of ergonomic products. Application: The literature survey results can be of help to understand 4D scanning systems and their applicability in ergonomic design and evaluation.
A Usability Test for Dr. Liver, a 3D Virtual Liver Surgical Planning System
Xiaopeng Yang,Younggeun Choi,Wonsup Lee,Baojian Wang,Jaedo Yang,Hongpil Hwang,Ji Hyun Kim,Jisoo Song,Hee Chul Yu,Baik Hwan Cho,Heecheon You 대한인간공학회 2013 대한인간공학회 학술대회논문집 Vol.2013 No.5
A usability test was performed for a 3D virtual liver surgical planning system, named Dr. Liver. The system consists of five modules including (1) (1) Liver Extraction, (2) Vessel Extraction, (3) Tumor Extraction, (4) Liver Segmentation, and (5) Liver Surgery Planning. Various performance and preference measures were applied and opinions of the participants regarding likes, dislikes, and suggestions were collected. Three medical doctors participated in the usability test, consisting of five test modules. The system received a high score of satisfaction (mean = 6.5, S.D. = 0.8) as measured using a 7-point Likert scale throughout the five test modules. Based on the evaluation results, recommendations were made for better usability of the system. The present study would help practitioners to evaluate the usability of a system and identify potential usability problems in a systematic manner.
YANG XIAOPENG,양재도,이승훈,황홍필,안성우,유희철,유희천 연세대학교의과대학 2018 Yonsei medical journal Vol.59 No.4
Purpose: The present study developed formulas for estimation of standard liver volume (SLV) with high accuracy for the Koreanpopulation. Materials and Methods: SLV estimation formulas were established using gender-balanced and gender-unbalanced measurementsof anthropometric variables, body composition variables, and abdominal geometry of healthy Koreans (n=790). Total livervolume excluding blood volume, was measured based on CT volumetry. Results: SLV estimation formulas as preferred in various conditions of data availability were suggested in the present study. Thesuggested SLV estimation formulas in the present study were found superior to existing formulas, with an increased accuracy of4.0−217.5 mL for absolute error and 0.2−18.7% for percentage of absolute error. Conclusion: SLV estimation formulas using gender-balanced measurements showed better performance than those using gender-unbalanced measurements. Inclusion of body composition and abdominal geometry variables contributed to improved performanceof SLV estimation.
Development and Usability Testing of a User-Centered 3D Virtual Liver Surgery Planning System
Xiaopeng Yang,Hee Chul Yu,Younggeun Choi,Wonsup Lee,Jaedo Yang,Ji Hyun Kim,Baik Hwan Cho,Heecheon You 대한인간공학회 2014 대한인간공학회 학술대회논문집 Vol.2014 No.11
The present study developed a user-centered 3D virtual liver surgery planning system called Dr. Liver, which has clinical applicability and effectiveness to support liver surgery. Use scenarios of Dr. Liver were developed through literature review, benchmarking, and interviews with surgeons. User interfaces of Dr. Liver were designed with various user-friendly features such as hierarchical dropdown menus, hotkey menus provided on the screen, and 3D view indication box and resetting buttons. Novel image processing algorithms were developed and implemented into Dr. Liver for accurate and efficient liver surgery planning. Potential usability problems were identified by a preliminary usability testing at the early development stage and improvements were made for the identified usability problems. A usability testing showed that the improved Dr. Liver achieved higher time efficiency (= 21.8 ± 4.4 min) and overall user satisfaction (= 6.2 ± 0.7) than the previous version (time = 36.6 ± 1.7 min; overall satisfaction = 5.6 ± 0.5). The development and evaluation process of Dr. Liver in this study would help practitioners develop a user-friendly virtual surgery planning system.