A Vertically Intersected Dual Axes Modularized Actuator System (DAMA)

Ren-Jeng Wang,Han-Pang Hung,Tz-How Huang,His-Fan Liao 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10

A Vertically Intersected Dual Axes Modularized Actuator System (DAMA) designed for humanoid robots is developed in this paper. The DAMA consists of two independent joint systems, joint 01 and joint02. Joint 01 uses a harmonic drive while joint02 uses a cable arrangement. Based on the simulations of ADMAS and MATLAB software packages, the system dynamic properties can be observed. The system structure is further refined using finite element analysis. In addition, the hardware and software control systems of DAMA are developed. The architecture of hardware is composed of notebook computer, a USB to RS-232 module, an RS-232 to CAN Bus Module and two independent-joint controller modules. The software control system (user interface) is written by Visual C++ 2005 to enable users to manipulate a two-axial robot easily. The system employs a simple, but effective, PID scheme to independently control the DAMA’s two joints. The experimental result shows that, for an S curve input position command, the DAMA’s two independent joints rotate and track the command well. Hence, DAMA can be used as a generic module for a multiple degree-of-freedom system.

Effects of thickness variations on the thermal elastoplastic behavior of annular discs

Wang, Yun-Che,Alexandrov, Sergei,Jeng, Yeau-Ren Techno-Press 2013 Structural Engineering and Mechanics, An Int'l Jou Vol.47 No.6

Metallic annular discs with their outer boundary fully constrained are studied with newly derived semi-analytical solutions for the effects of thickness variations under thermal loading and unloading. The plane stress and axisymmetric assumptions were adopted, and the thickness of the disk depends on the radius hyperbolically with an exponent n. Furthermore, it is assumed that the stress state is two dimensional and temperature is uniform in the domain. The solutions include the elastic, elastic-plastic and plastic-collapse behavior, depending on the values of temperature. The von Mises type yield criterion is adopted in this work. The material properties, Young's modulus, yield stress and thermal expansion coefficient, are assumed temperature dependent, while the Poisson's ratio is assumed to be temperature independent. It is found that for any n values, if the normalized hole radius a greater than 0.6, the normalized temperature difference between the elastically reversible temperature and plastic collapse temperature is a monotonically decreasing function of inner radius. For small holes, the n values have strong effects on the normalized temperature difference. Furthermore, it is shown that thickness variations may have stronger effects on the strain distributions when temperature-dependent material properties are considered.

The role of the genomic mutation signature and tumor mutation burden on relapse risk prediction in head and neck squamous cell carcinoma after concurrent chemoradiotherapy

Wang Hui-Ching,Moi Sin-Hua,Chan Leong-Perng,Wu Chun-Chieh,Du Jeng-Shiun,Liu Pei-Lin,Chou Meng-Chun,Wu Che-Wei,Huang Chih-Jen,Hsiao Hui-Hua,Pan Mei-Ren,Chen Li-Tzong 생화학분자생물학회 2023 Experimental and molecular medicine Vol.55 No.-

Personalized genetic profiling has focused on improving treatment efficacy and predicting risk stratification by identifying mutated genes and selecting targeted agents according to genetic testing. Therefore, we evaluated the role of genetic profiling and tumor mutation burden (TMB) using next-generation sequencing in patients with head and neck squamous cell carcinoma (HNSC). The relapse mutation signature (RMS) and chromatin remodeling mutation signature (CRMS) were explored to predict the risk of relapse in patients with HNSC treated with concurrent chemoradiotherapy (CCRT) with platinum-based chemotherapy. Patients in the high RMS and CRMS groups showed significantly shorter relapse-free survival than those in the low RMS and CRMS groups, respectively (p < 0.001 and p = 0.006). Multivariate Cox regression analysis showed that extranodal extension, CCRT response, and three somatic mutation profiles (TMB, RMS, and CRMS) were independent risk predictors for HNSC relapse. The predictive nomogram showed satisfactory performance in predicting relapse-free survival in patients with HNSC treated with CCRT.

Service experience and design : a preliminary survey study

Kung-Jeng Wang,Yu-Siang Lin,Jyun-Lin Chen,Ren-Dar Yang 대한인간공학회 2014 대한인간공학회 학술대회논문집 Vol.2014 No.5

This study reviews the recent literature in the field of service design and service experience from 1995 to 2013. The density map of frequently used terms presents focused fields by recent scholars. The citation network and the main path of the 30 most frequently cited documents are explored using knowledge flow.

Service Experience and Design-A Preliminary Survey Study

( Kung Jeng Wang ),( Yu Siang Lin ),( Jyun Lin Chen ),( Ren Dar Yang ) 한국감성과학회 2014 춘계학술대회 Vol.2014 No.-

This study reviews the recent literature in the field of service design and service experience from 1995 to 2013. The density map of frequently used terms presents focused fields by recent scholars. The citation network and the main path of the 30 most frequently cited documents are explored using knowledge flow.

Effects of thickness variations on the thermal elastoplastic behavior of annular discs

Yun-Che Wang,Sergei Alexandrov,Yeau-Ren Jeng 국제구조공학회 2013 Structural Engineering and Mechanics, An Int'l Jou Vol.47 No.6

Metallic annular discs with their outer boundary fully constrained are studied with newly derived semi-analytical solutions for the effects of thickness variations under thermal loading and unloading. The plane stress and axisymmetric assumptions were adopted, and the thickness of the disk depends on the radius hyperbolically with an exponent n. Furthermore, it is assumed that the stress state is two dimensional and temperature is uniform in the domain. The solutions include the elastic, elastic-plastic and plasticcollapse behavior, depending on the values of temperature. The von Mises type yield criterion is adopted in this work. The material properties, Young’s modulus, yield stress and thermal expansion coefficient, are assumed temperature dependent, while the Poisson’s ratio is assumed to be temperature independent. It is found that for any n values, if the normalized hole radius a greater than 0.6, the normalized temperature difference between the elastically reversible temperature and plastic collapse temperature is a monotonically decreasing function of inner radius. For small holes, the n values have strong effects on the normalized temperature difference. Furthermore, it is shown that thickness variations may have stronger effects on the strain distributions when temperature-dependent material properties are considered.

A New Synchronous Error Control Method for CNC Machine Tools with Dual-Driving Systems

Shih-Ming Wang,Ren-Jeng Wang,Shambaljamts Tsooj 한국정밀공학회 2013 International Journal of Precision Engineering and Vol. No.

Driving an object along one axis with two driving systems is a common method for obtaining high acceleration and high trust force for a large CNC machine tool. However, if large synchronous movement error exists between the two driving systems, the machine will not be able to achieve high acceleration. Moreover, it may also cause serious structure deformation and damage to the machine. To solve this problem, a new control method integrating the model reference adaptive control and variable structure control was developed and verified in this study. The proposed method can determine and compensate on-line the synchronous movement errors between two driving systems so that the master driving unit and the slave driving unit of a dual-driving system can synchronously move with no large drag force and reach the desired acceleration. Experiments were performed on a gantry-type two-axis platform with a sliding 5-Kg metal block attached on the X-axis. The experimental results showed that the maximum and the average synchronous movement errors were reduced from 0.061 mm to 0.040 mm and from 0.032 mm to 0.013 mm, respectively.

TLPKA: Pairwise Key Agreement Based on the Geometrical Property of the Tangent Line in Ad Hoc Network Systems

Chung-Wei Chen,Shiuh-Jeng Wang,Yuh-Ren Tsai 보안공학연구지원센터 2008 International Journal of Hybrid Information Techno Vol.1 No.4

In this paper, we propose a new pairwise key agreement, TLPKA (Tangent Line Pairwise Key Agreement), for establishing a secure link between members in an ad hoc network. With pairwise keys, data transmitted in ad hoc networks can be protected from the eavesdropping of outsiders. These pairwise keys can also be used to authenticate members in ad hoc networks. In addition, due to the property of uniqueness of pairwise keys, it also provides non-repudiation for data transmitting. In our scheme, we propose a new idea for the design of pairwise key agreements in an ad hoc network. Our scheme is based on the geometrical property of the tangent line and the mechanisms in our scheme are inspired by the Shamir secret sharing scheme. Our schemes also provide reciprocal authentication among node communicants. The robustness of our scheme is based on the DH problem and the indefinite solutions in coordinate geometry. In addition, we compare our scheme with other schemes. Although there is a higher overhead associated with our scheme, it maintains a higher security level than the other schemes.

Light-Emitting Diode-Assisted Narrow Band Imaging Video Endoscopy System in Head and Neck Cancer

Hsin-Jen Chang,Wen-Hung Wang,Yen-Liang Chang,Tzuan-Ren Jeng,Chun-Te Wu,Ludovic Angot,Chun-Hsing Lee,Pa-Chun Wang 대한소화기내시경학회 2015 Clinical Endoscopy Vol.48 No.2

Background/Aims: To validate the effectiveness of a newly developed light-emitting diode (LED)-narrow band imaging (NBI) system for detecting early malignant tumors in the oral cavity. Methods: Six men (mean age, 51.5 years) with early oral mucosa lesions were screened using both the conventional white light and LED-NBI systems. Results: Small elevated or ulcerative lesions were found under the white light view, and typical scattered brown spots were identified after shifting to the LED-NBI view for all six patients. Histopathological examination confirmed squamous cell carcinoma. The clinical stage was early malignant lesions (T1), and the patients underwent wide excision for primary cancer. This is the pilot study documenting the utility of a new LED-NBI system as an adjunctive technique to detect early oral cancer using the diagnostic criterion of the presence of typical scattered brown spots in six high-risk patients. Conclusions: Although large-scale screening programs should be established to further verify the accuracy of this technology, its lower power consumption, lower heat emission, and higher luminous efficiency appear promising for future clinical applications.