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A Method for Improving Power Distribution Characteristics of Space Time Block Codes

China Communications 2020年第6期17卷 223-234页

作者： Vahid Abbasi mahrokh gshayesteh Department of Electrical Engineering Urmia UniversityUrmia 57561-15311Iran Wireless Research Lab. Elec.Eng.Dep.ACRISharif University of TechnologyTehran 11365-9363Iran

Improving power distribution characteristics of space time block codes(STBCs),namely peak to average power ratio(PAPR),average to minimum power ratio(Ave/min),and probability of transmitting"zero"by antenna,makes easier their practical implementation.To this end,this study proposes to multiply full diversity STB C with a non-singular matrix in multiple input multiple output(MIMO)or multiple input single output(MISO)systems with linear or maximum likelihood(ML)receivers.It is proved that the obtained code achieves full diversity and the order of detection complexity does not change.The proposed method is applied to different types of STBCs.The bit error rate(BER)and power distribution characteristics of the new codes demonstrate the superiority of the introduced method.Further,lower and upper bounds on the BER of the obtained STBCs are derived for all receivers.The proposed method provides trade-off among PAPR,spectral efficiency,energy efficiency,and BER.

关键词： full diversity linear receiver maximum likelihood peak to average power ratio power distribution space time block codes

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伊朗护士关于家庭护理伦理问题的质性研究

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International Journal of Nursing Sciences 2022年第3期9卷 364-372页

作者： Masoume Arab Mohsen Shahriari Amir Keshavarzian Abbas Abbaszadeh mahrokh Keshvari School of Nursing and Midwifery Isfahan University of Medical SciencesIsfahanIran Department of Medicine Sari BranchIslamic Azad UniversitySariIran Nursing and Midwifery Care Research Center Adult Health Nursing DepartmentSchool of Nursing and MidwiferyIsfahan University of Medical SciencesIsfahanIran Department of Medical Ethics&Philosophy of Medicine School of MedicineShiraz University of Medical SciencesShirazIran Department of Medical Ethics Isfahan University of Medical SciencesIsfahanIran School of Nursing and Midwifery Shahid Beheshti University of Medical SciencesTehranIran Nursing and Midwifery Care Research Center School of Nursing and Midwifery Department of Community Health Nursing Isfahan University of Medical SciencesIsfahanIran

目的鉴于院外护理服务的重要性,家庭护理的出现,以及护理实践中伦理框架的需求,本研究旨在探讨护士对家庭护理中伦理问题的看法和体验。方法采用面对面个人访谈收集资料。2020年,通过目的性抽样方法选取在伊朗4个城市的家庭护理中心中... 详细信息

目的鉴于院外护理服务的重要性,家庭护理的出现,以及护理实践中伦理框架的需求,本研究旨在探讨护士对家庭护理中伦理问题的看法和体验。方法采用面对面个人访谈收集资料。2020年,通过目的性抽样方法选取在伊朗4个城市的家庭护理中心中工作的20名护士进行访谈,了解他们在家庭护理过程中关于伦理问题的看法和体验。基于内容分析法,应用Granehei和Lundman方法对资料进行分析。结果本研究共提取编码416个。基于相似性对编码进行合并,提取出7个主题和16个子主题。主题包括对职业身份的感知、尊重患者的自主权、尊重隐私、建立人际交往、维护相互安全、遵守公平性原则和文化-宗教能力。子主题包括责任、专业发展及专业间互动、在家庭护理中保持专业性、提供整体性和艺术性的护理、尊重患者隐私、尊重护士隐私、信息保密、尊重服务对象的选择、诚实告知、富有同情心的互动、平衡权力地位、维护患者安全、维护护士安全、公平性的建立、尊重家庭宗教信仰,以及注重文化敏感性。结论研究参与者表示由于在家庭护理中涉及患者隐私,与在医院环境中的护理实践相比,家庭护理中对于护士职业身份的认知、隐私、家庭互动的管理、相互安全和文化-宗教能力等伦理问题显得尤为重要。

关键词：伦理学,护理家庭护理(专业) 护士定性研究

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Recognition of Different Cars Using Moment Invariants and Back-Propagation Neural Network

Recognition of Different Cars Using Moment Invariants and Ba...

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1998 International Conference on Neural Networks and Brain(ICNN&B’98)

作者： mahrokh G.Shayesteh Shiva Rostamzadeh Karim Faez College of Engineering Uroumieh University UroumiehIRAN Department of Electrical Engineering Amir Kabir University of Technology TehranIRAN

＜正＞Orthogonal moments that are invariant to the basic image transformations such as translation, scaling,rotation,and/or reflection are of great importance in pattern recognition.In this paper we show that various orders of the scale-invariant central moments,normalized Zernike moment invariants （NZMI） and normalized Pseudo-Zernike moment invariants（NPZMI） could be used as features of cars to train a neural network.

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The Agreement Rate about Unintended Pregnancy and Its Relationship with Postpartum Depression in Parents of Preterm and Term Infants

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Open Journal of Nursing 2015年第9期5卷 797-804页

作者： Maryam Ghorbani mahrokh Dolatian Jamal Shams Hamid Alavi-Majd Shahid Beheshti University of Medical Sciences Tehran Iran Department of Reproductive Health and Midwifery School of Nursing and Midwifery Shahid Beheshti University of Medical Sciences Tehran Iran Department of Psychiatry Behavioral Research Center Shahid Beheshti University of Medical Sciences Tehran Iran Department of Biostatistics School of Paramedical Sciences Shahid Beheshti University of Medical Sciences Tehran Iran

Introduction: Postpartum depression (PPD) affects women’s health and self-confidence, and infant’s social, emotional, cognitive and even physical development. Studies show that parents of preterm infants frequently experience symptoms of depression and anxiety. Women with unintended pregnancy are subjected to more risk of depression than women with planned pregnancy. Unintended pregnancy may lead to increased maternal exposure to psychosocial stressors, reduced social support by the spouse, increased levels of depressive symptoms and decreased life satisfaction. Findings: No significant difference was observed between term and preterm infants’ mothers (p = 0.85) in terms of postpartum depression. However, two groups of fathers in terms of depression showed a significant difference (p = 0.045). McNemar’s test showed that parents of term infants (K = 0.322, p = 0.077), and parents of preterm infants (k = 0.17, p = 0.144) agreed with each other on unintended pregnancy. Conclusion: Fathers of preterm infants are at higher risk for mental disorders than fathers of term infants and they need more attention in future studies.

关键词： Prematurity Parents Depression Postpartum Depression Unintended Pregnancy

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A Comparison between Dietary Habits for Pregnant Women with Preterm and Term Delivery in Khorasan, Iran

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Open Journal of Nursing 2015年第9期5卷 790-796页

作者： Zohreh Teimouri mahrokh Dolatian Sara Shishehgar Marjan Ajami Hamid Alavi Majd Department of Midwifery International branch of ShahidBeheshti University of Medical Sciences Tehran Iran Department of Midwifery School of nursing and midwifery Shahid Beheshti University of Medical Sciences Tehran Iran Faculty of Health University of Technology Sydney Australia Department of Nutrition Iran University of Medical Sciences Tehran Iran Department of Biostatistics School of Paramedical Sciences Shahid Beheshti University of Medical Sciences Tehran Iran

Background: Despite the advances in prenatal care and improving health indicators, preterm delivery and resultant infant mortality rate are still considerable. Emerged financial, social, mental and emotional damages could result in mental and behavioral disabilities for mothers as well as children. Although spontaneous preterm labor is well known as a multifactorial issue, yet poor nutrition is assumed as a strong related factor. Objective: To identify the role of dietary habits on preterm delivery prevalence in Iran, this study was conducted on pregnant women with preterm and term delivery. Methods: In this retrospective case-control study, 70 women with preterm labor and 70 women with term labor were compared in terms of their dietary habits. Women who met the inclusion criteria and referred to two hospitals in North-East of Iran were selected using purposive convenience sampling method and completed 163-item food frequency and dietary habits questionnaire. Results: This study showed that dietary habits of women with preterm labor are more unfavorable compared to women with term labor (P = 0.023). Generally, dietary habit of more than half of the women with preterm labor, in this study, was assessed unfavorable. In terms of different food groups, daily intake of vegetables was significantly lower in women with preterm labor (P = 0.02). Consumption of dairy products was also lower in women with preterm labor than women with term labor which was significant (P = 0.05). Conclusion: To prevent adverse outcomes of preterm delivery more attention regarding nutritional planning for pregnant women seems to be essential.

关键词： Dietary Habit Preterm Delivery Pregnancy

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