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Stress analysis of rotating annular hyperbolic discs obeying a pressure-dependent yield criterion
Woncheol Jeong,Kwansoo Chung 국제구조공학회 2016 Structural Engineering and Mechanics, An Int'l Jou Vol.58 No.4
The Drucker-Prager yield criterion is combined with an equilibrium equation to provide the elastic-plastic stress distribution within rotating annular hyperbolic discs and the residual stress distribution when the angular speed becomes zero. It is verified that unloading is purely elastic for the range of parameters used in the present study. A numerical technique is only necessary to solve an ordinary differential equation. The primary objective of this paper is to examine the effect of the parameter that controls the deviation of the Drucker-Prager yield criterion from the von Mises yield criterion and the geometric parameter that controls the profile of hyperbolic discs on the stress distribution at loading and the residual stress distribution.
WonCheol Shin,DongHo Song,EunHye Ha,YeeJin Shin 대한신경정신의학회 2006 PSYCHIATRY INVESTIGATION Vol.3 No.2
Objective: Anticonvulsants are known to be effective to manage affective instability and aggressive behavior by reducing neuronal excitability. This study examined the efficacy and safety of topiramate, a novel anticonvulsant, on disruptive behavioral problems in children and adolescents, with or without mental retardation (MR), and the differences of short-term efficacy and safety according to the IQ levels. Methods and Materials: Fifty-four children and adolescents with disruptive behavioral problems were enrolled in a 6- week, open-label study. All subjects were divided into 3 groups (subjects without MR, Non-MR; subjects with mild MR, Mild MR; and subjects with moderate to severe MR, Mod-Severe MR) based on their intellectual ability, and treated with topiramate. Outcome measures included the Aberrant Behavior Checklist Hyperactivity (ABC-H) and Irritability (ABC-I) subscales and the Clinical Global Impression Severity (CGI-S) scale. Results: Significant reduction of CGIS, ABC-H, and ABC-I scores were noted in all three groups in the following order: Non-MR, Mild MR, and Mod-Severe MR. Parethesia, anorexia, somnolence, nocturnal enuresis, and urinary frequency were relatively common adverse event. However, no serious adverse events were reported. Conclusions: Topiramate was effective and well tolerated for managing disruptive behavioral problems and emotional instability in children and adolescents.
Effective identification of dominant fully absorbing sets for Raptor-like LDPC codes
Woncheol Cho,Chanho Yoon,Kapseok Chang,Young-Jo Ko Electronics and Telecommunications Research Instit 2023 ETRI Journal Vol.45 No.1
The error-rate floor of low-density parity-check (LDPC) codes is attributed to the trapping sets of their Tanner graphs. Among them, fully absorbing sets dominantly affect the error-rate performance, especially for short blocklengths. Efficient methods to identify the dominant trapping sets of LDPC codes were thoroughly researched as exhaustively searching them is NP-hard. However, the existing methods are ineffective for Raptor-like LDPC codes, which have many types of trapping sets. An effective method to identify dominant fully absorbing sets of Raptor-like LDPC codes is proposed. The search space of the proposed algorithm is optimized into the Tanner subgraphs of the codes to afford time-efficiency and search-effectiveness. For 5G New Radio (NR) base graph (BG) 2 LDPC codes for short blocklengths, the proposed algorithm finds more dominant fully absorbing sets within one seventh of the computation time of the existing search algorithm, and its search-effectiveness is verified using importance sampling. The proposed method is also applied to 5G NR BG1 LDPC code and Advanced Television Systems Committee 3.0 type A LDPC code for large blocklengths.