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Classifying Semantic Relations in German Nominal Compounds using a Hybrid Annotation Scheme
( Daniil Sorokin ),( Corina Dima ),( Erhard Hinrichs ) 서울대학교 인지과학연구소 2015 Journal of Cognitive Science Vol.16 No.3
This paper reports on novel results for the automatic classification of semantic relations that hold between the constituents of nominal compounds in German. It utilizes a hybrid annotation scheme that models semantic relations using a combination of prepositional paraphrases and semantic properties. The machine learning (ML) experiments use the support vector machine (SVM) implementation in Weka for single-label prediction tasks and Weka SVMs in conjunction with the Mulan library for multi-label prediction.
An Efficient Method to Calculate Optimal Pulse Patterns for Multi-Level Converters
Reza Fotouhi,Alexey Sorokin,Ralph Kennel,Hendrik du Toit Mouton 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
Optimal Pulse Patterns (OPPs) permit setting the switching frequency of power converters to a low value without compromising on Total Harmonic Distortion (THD). The optimization, which is performed offline, is a slow procedure. For instance a normal PC might need up to several weeks to calculate OPPs for a five-level converter. This paper presents a general algorithm for calculating OPPs for multi-level converters. Where calculation time is highly reduced via reformulation of optimization problem and choosing proper initial values. The calculation procedure is explained in detail and compared with standard optimization algorithm for a five-level inverter.
Armais Albertovich Kamalov,Nikolay Ivanovich Sorokin,Vitaly Kazichanovich Dzitiev,Andrey Alekseevich Strigunov,Olga Yurevna Nesterova,Ilya Vladimirovich Bondar 대한비뇨의학회 2024 Investigative and Clinical Urology Vol.65 No.2
Purpose: To compare perioperative, functional, and safety outcomes between thulium fiber laser enucleation of the prostate (ThuFLEP) and bipolar enucleation of the prostate performed by a single surgeon with use of propensity score (PS)-matched analysis. Materials and Methods: Data were from 675 patients, 422 of whom underwent ThuFLEP and bipolar enucleation by a single highly experienced surgeon. ThuFLEP was performed with Fiberlase U1 (IRE Polus Ltd.). Perioperative parameters, safety, and functional outcomes, such as International Prostate Symptom Score (IPSS), quality of life (QoL), postvoid residual volume (PVR), and maximum urinary flow rate (Qmax) were assessed. To control for selection bias, a 1:1 PS-matched analysis was carried out using the following variables as covariates: total prostate volume, preoperative IPSS and early sphincter release. Results: Of 422 patients, 370 (87.7%) underwent ThuFLEP and 52 (12.3%) underwent bipolar enucleation. Operation, enucleation, and morcellation time were comparable between groups before and after PS-matched analysis (p=0.954, p=0.474, p=0.362, respectively). Functional parameters (IPSS, QoL, PVR, Qmax) were also comparable between groups at every time point before and after PS matching. Significant improvements in IPSS, QoL score, Qmax, and PVR were observed during the 24-month follow-up period for both ThuFLEP and bipolar enucleation without any significant differences between groups. Early and late postoperative complications before and after PS-matched analysis were similar. Conclusions: ThuFLEP was comparable to bipolar enucleation in perioperative characteristics, improvement in voiding parameters, and complication rates. Both procedures were shown to be effective and safe in the management of benign prostatic hyperplasia.
김선우(Sunwoo Kim),막심 소로킨(Maksim Sorokin),하세훈(Sehoon Ha),이제희(Jehee Lee) 한국컴퓨터그래픽스학회 2021 한국컴퓨터그래픽스학회 학술대회 Vol.2021 No.7
본 연구에서는 사람의 운동을 이용하여 사족 보행 로봇을 제어하는 새로운 시스템을 제시한다. 사람의 운동을 통한 제어는 사족 보행 로봇에게 한정되지 않은 다양한 제어 목표를 갖고 즉각적으로 반응하여 움직일 수 있게끔 한다. 이와 같은 시스템을 만들기 위해서 본 연구에서는 기존의 직접적인 방식의 자세 매핑 방법이 아닌 인공신경망을 이용한 매핑 방식을 제안하였다. 또한, 강화학습을 통해 로봇의 운동 정책을 수립하였다. 마지막으로 새로운 제어 시스템 모델을 제시함으로써, 사람의 자유분방한 움직임을 통해 사족 보행 로봇 제어에 제한을 없애고 다양한 움직임을 생성해냈다. 본 연구에서는 보행, 뛰기, 팔 뻗기, 몸체 회전 및 굽히기 등 다양한 사람의 운동을 통해 물리 시뮬레이션 상의 사족 보행 로봇을 제어할 수 있음을 입증하였다.