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This paper deals with the speed control of a BLDCM with rectangular back electromotive force using fuzzy logic controller. The fuzzy PI controllers make the many degrees of freedom in proportion to the number of the rule for input and its ability of adjustment for control input is excellent. Thus, the proper adjustment of the fuzzy rules can provide the good performance for the system. Above all, the advantage of the fuzzy controller has the characteristic of robustness for parameter variation, load change, noises. As a current controller, a hysterisis current controller is implemented, and in order to reduce torque ripple in low speed range, current controller detects the uncommutating mode current for every 60 electrical degree. The fuzzy speed controller is implemented by MCS80C196KC, a 16 bit one-chip microprocessor. The experimental results show that the performance of the fuzzy speed controller is superior to that of the conventional PI controller in terms of robustness for the change of load torque.
Since the Korean construction contractors captured over 11% of the overseas market and twenty-five of them were listed in the top 250 international contractors in 1983 (ENR, 1984), they have struggled against the inefficiency of their organizations, the accelerating competition, and the rapid changes in the managerial environment. Although the various features of the environment required variety in the strategy and organizational structure, the managers have not kept pace with the requirement, but have showed an inability to predict if changes will have an influence on their organizations and, furthermore, they lack understanding of what response is proper to the environmental changes they face. The understanding of the suitability of an organization's structure and managerial environment can help evaluate the competitive power of the organization. This study will describe some problems in the Korean construction industry and, through an analysis of the Korean construction organization and managerial environment based on theories, suggest the directions in which the industry should move to develop. Through the process of this study the Korean construction organizations and their development phases are classified into five categories based on theories, and the environmental factors and the Korean contractors' responses to the changing environment are surveyed.
The association between pulmonary tuberculosis (TB) and female reproductive health problems is not well addressed. This case show the need to estimate the effect of pulmonary TB on menstrual patterns and fertility of women in childbearing age. The reasons for menstrual abnormalities after TB treatment can be associated with possible antigonadotropic effect of Mycobacterium tuberculosis and increased enzymatic catabolism of estrogen caused by antitubercular drug-rifampicin affecting luteinizing hormone surge. A 32 years old multiparous woman presented to our infertility clinic in April 2015 with two year history of secondary infertility. She had a history of therapeutic termination of pregnancy at 13 weeks gestation by dilatation and evacuation due to multi drug resistance tuberculosis in 2012. And she had induced abortion due to severe hyperemesis gravidarum at 8 weeks gestation in 2010. After tuberculosis medication, she tried for a natural pregnancy for a period of 1 yr with no success. She had been investigated extensively for infertility. Noting had been found except showing polycystic ovary, and two timed intercourses with clomiphene citrates and three intrauterine insemination treatment failed. After this she underwent one cycle of in vitro fertilization (IVF), which resulted in the full-term, normal delivery of a healthy baby at 39 weeks. Any disease which is associated with systemic inflammatory response can change menstral patterns. However, hypomenorrhea, amenorrhea and irregular menstration has been described in a substantial number of patients with pulmonary TB. Acccording to one study, very high (90.9%) incidence of menstrual dysfunction was observed in TB patients which was similar in pulmonary (90.5%) and extrapulmonary (91.7%) TB cases. But the reason for this is poorly understood. TB is still an important cause of mortality and morbidity all over the world. We need to study the association with menstrual dysfunction and pulmonary TB.