画像からの顕著領域と人物の検出に関する研究

九州工業大学博士学位論文（要旨） 学位記番号:工博甲第365号 学位授与年月日:平成26年3月25日九州工業大

画像からの顕著領域と人物の検出に関する研究

九州工業大学博士学位論文（要旨） 学位記番号:工博甲第365号 学位授与年月日:平成26年3月25日九州工業大

Alienor method applied to induction machine parameters identification

This paper presents an identification method to estimate simultaneously the electrical and mechanical induction machine (IM) parameters by using only the measured current and the corresponding phase voltage. This identification method is based on the output error and uses the multidimensional Alienor global optimization method as a minimization technique. Alienor method is essentially based on converting multivariable problem to monovariable one. To improve the Alienor method performance, the reducing transformation is proposed and compared with the genetic algorithm (GA). Firstly, the identification method is verified using the simulated data. Secondly, the validation is then confirmed by measured data from one machine. The corresponding computed transient and steady state currents agree well with the measured data. The results obtained show the superiority of the proposed Alienor method versus GA in terms of computing time

画像からの顕著領域と人物の検出に関する研究

九州工業大学博士学位論文 学位記番号:工博甲第365号　学位授与年月日:平成26年3月25日1. General Introduction|2. Saliency detection using combined spatial non-redundancy and local appearance|3. Human detection using LBP-based patterns of oriented edges|4. General Conclusion|5. Appendices九州工業大学平成25年

Optimal HSE-PWM based on genetic algorithm for seven levels diode clamped multilevel inverter

In this paper, the control of seven level diode clamped inverter with selective harmonic elimination (SHE) pulse width modulation (PWM) technique based on genetic algorithm (GA) has been developed. In standard SHE-PWM, the seven level inverters allow the elimination of only two low order harmonics. To improve the total harmonic distortion (THD), and without any modification to the inverter structure, five low order harmonics can be eliminated by suitably adding holes in the stairecase voltage leg. Furtheremore, a hole distribution in agreement with the sin function shape is proposed. For this, a real-coded genetic algorithm is applied under the standard constraints with a proposed cost function minimization that allow a better near sin function reshape of the output voltage leg. This GA computation allow to determine the switching angles for a seven-level diode clamped inverter to produce the required fundamental voltage and to eliminate undesirable harmonics. This developed procedure can eliminate a desired number of low harmonics and is only restricted by the maximal switching frequency of the power switches. The results of the suggested method are compared to the conventional SHE-PWM involved with a seven level staircase wave. They reveal that the developed method is a very effective one for optimal harmonic elimination technique

Plate fixation of the anterior pelvic ring in patients with fragility fractures of the pelvis

Introduction In fragility fractures of the pelvis (FFP), fractures of the posterior pelvic ring are nearly always combined with fractures of the anterior pelvic ring. When a surgical stabilization of the posterior pelvis is performed, a stabilization of the anterior pelvis is recommended as well. In this study, we aim at finding out whether conventional plate osteosynthesis is a valid option in patients with osteoporotic bone. Materials and methods We retrospectively reviewed medical charts and radiographs of all patients with a FFP, who underwent a plate osteosynthesis of the anterior pelvic ring between 2009 and 2019. Patient demographics, fracture characteristics, properties of the osteosynthesis, complications and revision surgeries were documented. Single plate osteosynthesis (SPO) at the pelvic brim was compared with double plate osteosynthesis (DPO) with one plate at the pelvic brim and one plate anteriorly. We hypothesized that the number and severity of screw loosening (SL) or plate breakage in DPO are lower than in SPO. Results 48 patients with a mean age of 76.8 years were reviewed. In 37 cases, SPO was performed, in 11 cases DPO. Eight out of 11 DPO were performed in patients with FFP type III or FFP type IV. We performed significantly more DPO when the instability was located at the level of the pubic symphysis (p = 0.025). More patients with a chronic FFP (surgery more than one month after diagnosis) were treated with DPO (p = 0.07). Infra-acetabular screws were more often inserted in DPO (p = 0.056). Screw loosening (SL) was seen in the superior plate in 45% of patients. There was no SL in the anterior plate. There was SL in 19 of 37 patients with SPO and in 3 of 11 patients with DPO (p = 0.16). SL was localized near to the pubic symphysis in 19 of 22 patients after SPO and in all three patients after DPO. There was no SL in DPO within the first month postoperatively. We performed revision osteosynthesis in six patients (6/48), all belonged to the SPO group (6/37). The presence of a bone defect, unilateral or bilateral anterior pelvic ring fracture, post-operative weight-bearing restrictions, osteosynthesis of the posterior pelvic ring, and the presence of infra- or supra-acetabular screws did not significantly influence screw loosening in SPO or DPO. Conclusion There is a high rate of SL in plate fixation of the anterior pelvic ring in FFP. In the vast majority, SL is located near to the pubic symphysis. DPO is associated with a lower rate of SL, less severe SL and a later onset of SL. Revision surgery is less likely in DPO. In FFP, we recommend DPO instead of SPO for fixation of fractures of the anterior pelvic ring, which are located in or near to the pubic symphysis

A Saliency Detection Technique Considering Self- and Mutual-Information

In this paper, we present a novel approach to saliency detection. We define a visually salient region in an image with following two properties; global spatial redundancy, i.e., mutual-information, and local saliency, i.e., self-information or simply the region complexity. The former is its probability of occurrence within the image, whereas the latter defines how much information is contained within a region, and it is quantified by the entropy. By combining the global spatial redundancy measure and local entropy, we can achieve a simple, yet robust saliency detector. We evaluate it quantitatively and qualitatively. The comparison to Itti et al. [6], the spectral residual approach by Hou and Zhang [5], Achanta et al. [13] as well as to Zhai and Shah [14], on publicly available data shows a significant improvement

A Survival Analysis of Student Mobility and Retention in Indiana Charter Schools

Research has demonstrated that high rates of student mobility are associated with a range of negative academic outcomes, both for students who leave their schools and those who remain behind. The current study focused on mobility among those enrolled in charter schools in the state of Indiana. A multilevel Cox Proportional Hazards survival analysis model was used to identify significant predictors of student mobility within and from a state charter school system, using factors at both the student and school levels. Results indicated that initial student achievement upon first entering a charter school, student ethnicity, participation in a Title I funded program, and average years of teacher experience at the school were all associated with the decision to leave the charter. Specifically, students with higher initial achievement scores, those eligible for Title 1 services, and non-Caucasian students were more likely to leave charter schools prematurely. In addition, schools with a more experienced faculty had lower early departure rates than did those with less experienced teachers

Effect of chronotype on emotional processing and risk taking

This is an original manuscript of an article published by Taylor & Francis in Chronobiology International on 30 March 2016, available online: http://www.tandfonline.com/10.3109/07420528.2016.1146739© 2016 Taylor & Francis. There is increasing evidence to suggest that late chronotypes are at increased risk for depression. The putative psychological mechanisms underpinning this risk, however, have not been fully explored. The aim of the present study was to examine whether, similar to acutely depressed patients and other "at risk" groups, late chronotype individuals display biases in tasks assaying emotional face recognition, emotional categorisation, recognition and recall and attention. Late chronotype was associated with increased recognition of sad facial expressions, greater recall and reduced latency to correctly recognise previously presented negative personality trait words and reduced allocation of attentional resources to happy faces. The current results indicate that certain negative biases in emotional processing are present in late chronotypes and may, in part, mediate the vulnerability of these individuals to depression. Prospective studies are needed to establish whether the cognitive vulnerabilities reported here predict subsequent depression

Managing periprosthetic fractures: perspectives on periprosthetic pelvic fractures

Periacetabular periprosthetic fractures are rare but potentially disastrous for the longevity of the adjacent implants, leading to multiple revision surgeries. It is of paramount importance to identify and treat intraoperative fractures, which will lead to satisfactory results. Postoperative fractures may be managed operatively or nonoperatively depending on the patient's pain and function, the fracture pattern, and the stability of the acetabular component