Time filter

Source Type

Prerov, Czech Republic

Chen Y.M.,Yuan Ze University | Wang W.-S.,College of Logistics
International Journal of Systems Science | Year: 2010

The objective proposed is of environmental/economic dispatch (EED) taking into account the environmental impact to achieve simultaneously the minimisation of fuel costs and pollutant emissions, while satisfying the operational constraints of power systems. The multiarea environmental/economic dispatch (MEED) deals with the optimal power dispatch of multiple areas (or countries). In this investigation, EED/MEED is proposed to address the environmental issue during the economic dispatch. In this article, the EED/MEED problem is first formulated and then a proposed Pareto archive multiobjective particle swarm optimisation (PAMPSO) algorithm is developed to derive a set of Pareto-optimal solutions. Its aim is to dispatch the power among different areas by simultaneously minimising the operational costs and pollutant emissions. In the proposed PAMPSO, local search is used to increase its search efficiency. To ensure the system security, tie-line transfer limits between different areas are incorporated as a set of constraints in the optimisation process. Numerical studies based on a four-area test power generation system are carried out to demonstrate the validity of the proposed optimisation method as well as the results from different problem formulations. Comparative results of PAMPSO and three other competitive multiobjective evolutionary algorithms (MOEAs) are also presented. © 2010 Taylor & Francis. Source

Chen Y.M.,Yuan Ze University | Wang W.-S.,College of Logistics
International Journal of Industrial Engineering Computations | Year: 2010

This paper proposes a particle swarm optimization (PSO) algorithm to solve various types of economic dispatch (ED) problems in power systems such as, environmental/economic dispatch (EED) and multi-area environmental/economic dispatch. The proposed model considers the environmental impact to achieve the minimization of fuel costs and pollutant emissions, simultaneously. The EED problem is further extended to dispatch the power among different areas to aid emission allowance trading. The performance of the proposed PSO is compared with conventional method and genetic algorithm. The results clearly show that the proposed algorithms give global optimum solution compared to the other methods. The results obtained also show that the proposed PSO algorithms can provide comparable dispatch solutions with reduced computation time for all types of ED problems. © 2010 Growing Science Ltd. All rights reserved. Source

To investigate factors with pelvic adhesions and the effect of different degrees pelvic adhesions on fallopian tube recanalization in infertile patients. Total of 527 infertile patients undergoing hysteroscopy and laparoscopic surgery in Affiliated Hospital of Chinese People's Armed Police Forces Logistics College were studied retrospectively. According to the extent of pelvic adhesions, tubal umbrella adhesions and atresia, 377 cases were classified into adhesion groups, including 73 cases in grade I, 221 cases in grade II, 75 cases in grade III and 8 cases in grade IV based on adhesion score. The 150 cases with no obvious pelvic adhesion were matched as control group. Among 8 cases with grade IV ahesion were exluded from ahesion group the relationship between pelvic adhesions and related history, abdominal lesions, tubal patency and the prognosis were studied. (1) Related factors: the frequency of pelvic adhesion and more than 7 years of infertility of 23.9% (88/369) in adhesion group were significantly higher than 12.0% (18/150) in control groups. (2) History: compared with the control group (12.7%, 19/150; 28.7%, 43/150; 11.3%, 17/150; 12.0%, 18/150; 17.3%, 26/150), patients with pelvic adhesions present more incidence abortion (23.6%, 87/369), uterine cavity operation (38.2%, 141/369), ectopic pregnancy (20.9%, 77/369), pelvic inflammatory disease (25.5%, 94/369) and abdominopelvic surgery (31.4%, 116/369). (3) Endoscopy exploration: the incidence of hydrosalpinx (24.7%, 91/369), tube distorted (15.7%, 58/369) and salpingostomy (72.9%, 269/369) in adhesion group were higher than those in control group (2.0%, 3/150; 4.0%, 6/150; 12.0%, 18/150), but relatively lower incidence of pelvic endometriosis lesions (5.7%, 21/369) and mesosalpinx cysts (16.3%, 60/369) than those in control group (16.0%, 24/150; 30.0%, 45/150). The rate of proximal tubal recanalization (59.5%, 91/153) in adhesion group was lower than 75.4% (52/69) in control group. However, the rate of distant tubal recanalization of 84.4%, (281/333) in adhesion group and; 13/15 in control group didn't show statistical difference. (4) Prognosis: the rate of ectopic pregnancy of 9.7% (29/299) in adhesion group was significantly higher than 3.1% (4/128) in control group. Among cases with grade III adhesion exhibited the highest rate of ectopic pregnancy (13.0%, 7/54; OR = 4.62, 95%CI: 1.29 - 16.50). (5) Multivariate analysis: it was found that more than two drug abortions (OR = 3.29, 95%CI: 1.34 - 8.07), pelvic and(or) abdominal surgery history (OR = 2.20, 95%CI: 1.35 - 3.57) and pelvic inflammatory disease history (OR = 1.54, 95%CI: 1.21 - 1.97) were risk factors with pelvic adhesions. More than or equal to two drug abortion history, pelvic inflammatory disease and pelvic and abdominal surgery damage were important factors for pelvic adhesions of infertility patients, which may decrease the possibility of proximal tubal recanalization and increase ectopic pregnancy risk. Source

Gruenwald H.,College of Logistics
Jurnal Teknologi | Year: 2016

With the Advent of ASEAN municipal solid waste (MSW) is estimated to increase 2-4% per year benchmarking waste management practices becomes of interest for the partner countries. This study surveyed logistics professionals from various parts of Thailand to obtain their feedback regarding waste management practices in their specific geographic location in terms of collection, transportation and disposal of the household and commercial waste.Refuse is collected in containers of various shapes and sizes ranging from baskets to metal and plastic garbage tons and dumpsters. The garbage truck size and type varies throughout Thailand but is more or less consistent within a municipality, rear loading with a crew of four including driver appears to be the standard, with sorting of garbage taking place at the truck at time of collection. © 2016 Penerbit UTM Press. All rights reserved. Source

Yang L.,College of Logistics
Spine | Year: 2016

STUDY DESIGN.: We collected the samples of cervical intervertebral discs from patients with vertigo to exam the distribution and types of mechanoreceptors in diseased cervical disc. OBJECTIVE.: To determine whether mechanoreceptors are distributed more abundantly in cervical discs from patients with cervical spondylosis, and whether they are related to vertigo. SUMMARY OF BACKGROUND DATA.: Previous limited studies have found that normal cervical intervertebral discs are supplied with mechanoreceptors which have been considered responsible for proprioceptive functions. Several clinical studies have indicated that the patients with cervical spondylosis manifested significantly impaired postural control and subjective balance disturbance. METHODS.: We collected 77 samples of cervical discs from 62 cervical spondylosis patients without vertigo, 61 samples from 54 patients with vertigo, and 40 control samples from 8 cadaveric donors to investigate distribution of mechanoreceptors containing neurofilament (NF200) and S-100 protein immunoreactive nerve endings. RESULTS.: The immunohistochemical investigation revealed that the most frequently encountered mechanoreceptors were the Ruffini corpuscles in all groups of cervical disc samples. They were obviously increased in the number and deeply ingrown into inner annulus fibrosus and even into nucleus pulposus in the diseased cervical discs from patients with vertigo in comparison with the discs from patients without vertigo and control discs. Only 3 Golgi endings were seen in the 3 samples from patients with vertigo. No Pacinian corpuscles were found in any samples of cervical discs. CONCLUSIONS.: The diseased cervical discs from patients with vertigo had more abundant distribution of Ruffini corpuscles than other discs. A positive association between the increased number and ingrowth of Ruffini corpuscles in the diseased cervical disc and the incidence of vertigo in the patients with cerveical spondylosis was found, which may indicate a key role of Ruffini corpuscles in the pathogenesis of vertigo of cervical origin.Level of Evidence: 4 Copyright © 2016 Wolters Kluwer Health, Inc. All rights reserved. Source

Discover hidden collaborations