Controlling domain wall chirality by combining hard and soft magnetic materials in planar nanostructures with wire-ring morphology

Corona R.M.,Castillo-Sepúlveda S.,Altbir D,Escrig J. 한국물리학회 2021 Current Applied Physics Vol.21 No.-

Vortex domain walls (DWs) are characterized by their chirality, an important property that needs to be controlled for the use of such walls in potential technological applications. In this work we explore a wire-ring structure in which we have alternate hard and soft magnetic materials. Our results evidence that, depending on the materials, it is possible to control the DW chirality when it goes through the ring section. Therefore, this system can be used as a device that controls domain wall chirality.

Consequences of Anabolic-Androgenic Steroid Abuse in Males; Sexual and Reproductive Perspective

Corona Giovanni,Rastrelli Giulia,Marchiani Sara,Filippi Sandra,Morelli Annamaria,Sarchielli Erica,Sforza Alessandra,Vignozzi Linda,Maggi Mario 대한남성과학회 2022 The World Journal of Men's Health Vol.40 No.2

The real epidemiology and the possible consequences of anabolic-androgenic steroids (AAS) use still represent a very tricky task due to the difficulties in the quantification and detection of these drugs. Chronic use of AAS, frequently combined with other illicit substances, can induce tremendous negative effects on the reproductive system, but it is also associated with an increased overall and cardiovascular mortality risk. In the present review we summarize and discuss the available evidence regarding the negative impact of AAS on the male reproductive system, providing practical suggestions to manage these problems. For this purpose a meta-analysis evaluating the effects of AAS abusers vs. controls on several hormonal, reproduc-tive and metabolic parameters was performed. In addition, in order to overcome possible limitations related to the combined use of different AAS preparations, we also retrospectively re-analyzed data on animal models treated with supraphysiologi-cal dosage of testosterone (T), performed in our laboratory. Available data clearly indicated that AAS negatively affect en-dogenous T production. In addition, increased T and estradiol circulating levels were also observed according to the type of preparations used. The latter leads to an impairment of sperm production and to the development of side effects such as acne, hair loss and gynecomastia. Furthermore, a worse metabolic profile, characterized by reduced high density lipoprotein and increased low density lipoprotein cholesterol levels along with an increased risk of hypertension has been also detected. Finally sexual dysfunctions, often observed upon doping, represent one the most probable unfavorable effects of AAS abuse.

Testosterone Deficiency and Risk of Cognitive Disorders in Aging Males

Corona Giovanni,Guaraldi Federica,Rastrelli Giulia,Sforza Alessandra,Maggi Mario 대한남성과학회 2021 The World Journal of Men's Health Vol.39 No.1

Cognitive impairment and dementia are predicted to undergo a dramatic increase in the following years with more than 131.5 million people being affected by 2030. Although vascular diseases play the most important role in the pathogenesis of memory impairment in aging men, some pre-clinical and clinical evidence has suggested a possible contribution of the age-dependent reduction of testosterone (T). In this paper we have summarized and discussed all the information derived from available animal and experimental studies. In addition, we meta-analyzed data rising from all randomized placebo controlled trials (RCTs) published so far. Only limited preclinical and clinical evidence can support a possible contribution of T in the pathogenesis of the age-dependent impairment of cognitive functions. In addition, our meta-analysis did not support the use of T replacement therapy for the improvement of several cognitive domains analyzed including attention/working memory, executive function, language, verbal memory, visual memory, visuomotor ability, and visuospatial ability. However, it is important to recognize that the vast majority of available RCTs included mixed populations of subjects with eugonadism and hypogonadism preventing any final conclusion being drawn on these issues.

Cardiovascular Risks of Androgen Deprivation Therapy for Prostate Cancer

Corona Giovanni,Filippi Sandra,Bianchi Nicola,Dicuio Mauro,Rastrelli Giulia,Concetti Sergio,Sforza Alessandra,Maggi Mario 대한남성과학회 2021 The World Journal of Men's Health Vol.39 No.3

Androgen deprivation therapy (ADT) is the gold standard treatment in patients with locally advanced or metastatic prostate cancer (PC). Emerging evidence has documented a tight association between ADT and body composition, along with meta-bolic profile impairment. These alterations might underpin the observed ADT-related increase in cardiovascular (CV) and thromboembolic (venous thromboembolism, VTE) mortality and morbidity. However, the specific mechanisms underlying these associations have not yet been completely elucidated. In the present review we summarize and discussed the avail-able evidence linking ADT to increased cardio-metabolic risk, using both preclinical and clinical data. When possible, meta-analytic studies were preferred. Preclinical evidence, using a rabbit model of gonadotrophin-releasing hormone analogue-induced hypogonadism, indicates that the induced condition is associated with a dramatic increase in visceral adiposity and with an impairment of acetylcholine induced vascular relaxation, along with an increased propensity towards fatty liver. This suggests a direct role of ADT in inducing a worsened metabolic profile. In contrast, available clinical data are not sufficient to clarify a direct pathogeniclink between reduced testosterone (T) and altered metabolism. In fact, although T deprivation is associated with an altered metabolism, it is possible that the association between ADT and CV or VTE risk could simply be the result of a selection bias, related to the poor health status of patients with advanced PC. Despite the aforementioned con-siderations, all patients who are candidatesfor ADT should be screened for CV risk factors at baseline and monitored during the therapy. Life-style modifications and physical exercise are strongly encouraged.

Novel suspended-line microstrip coupler using BCB as supporting layer

Corona-Chavez, A.,Llamas-Garro, I.,Kim, Jung-Mu,Kim, Yong-Kweon Wiley Subscription Services, Inc., A Wiley Company 2007 MICROWAVE AND OPTICAL TECHNOLOGY LETTERS Vol.49 No.8

<P>In this letter a novel λ/4 micromachined directional coupler is presented with a 10 μm benzocyclobutene (BCB) layer used to suspend one transmission line over another one in order to achieve a 3-dB coupling. The coupler is centered at a frequency of 24 GHz. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1813–1814, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22574</P>

Treatment of Functional Hypogonadism Besides Pharmacological Substitution

Corona Giovanni,Rastrelli Giulia,Morelli Annamaria,Sarchielli Erica,Cipriani Sarah,Vignozzi Linda,Maggi Mario 대한남성과학회 2020 The World Journal of Men's Health Vol.38 No.3

A dichotomic distinction between “organic” and “functional” hypogonadism is emerging. The former is an irreversible condition due to congenital or “acquired” “organic” damage of the brain centers or of the testis. Conversely, the latter is a potentially reversible form, characterized by borderline low testosterone (T) levels mainly secondary to age-related comorbidities and metabolic derangements, including metabolic syndrome (MetS). Life-style modifications, – here reviewed and, when possible, meta-analyzed –, have documented that weight-loss and physical exercise are able to improve obesity-associated functional hypogonadism and its related sexual symptoms. A rabbit experimental model, of MetS originally obtained in our lab, showed that endurance training (PhyEx) completely reverted MetS-induced hypogonadotropic hypogonadism by reducing hypothalamus inflammation and testis fibrosis eventually allowing for a better corpora cavernosa relaxation and response to sildenafil. Physicians should strongly adapt all the reasonable strategies to remove/mitigate the known conditions underlying functional hypogonadism, including MetS and obesity. Physical limitations, including reduced muscle mass and increased fat mass, along with low self-confidence, also due to the sexual problems, might limit a subject’s propensity to increase physical activity and dieting. A short term T treatment trial, by improving muscle mass and sexual function, might help hypogonadal obese patients to overcome the overfed, inactive state and to become physically and psychologically ready for changing their lifestyle.

Analysis of software patents and trademarks

Mario Corona,Sungjoo Lee 대한산업공학회 2011 대한산업공학회 춘계학술대회논문집 Vol.2011 No.5

Micromachined ultra-wideband beamforming network for automotive radar front ends

Alonso Corona-Chavez,lgnacio Llamas-Garro,김정무(Jung-Mu Kim),김용권(Yong-Kweon Kim) 대한전기학회 2005 대한전기학회 학술대회 논문집 Vol.2005 No.7

A Study of the Effect of Exhibition Employee’s Cultural Intelligence on Performance and Organization Loyalty

Cecile Corona,양정임,윤유식 한국마이스관광학회 2022 MICE관광연구 Vol.22 No.4

This study focused on exhibition employee’s plural dimensions of cultural intelligence and its effect on different types of performance and their loyalty to their organization in South Korea. The objectives were to identify each key dimension of cultural intelligence and its effects on exhibition employee performance and organizational loyalty. The study sample constituted of 237 exhibition employees present in international exhibitions in Seoul and its surroundings. The findings showed significant results for most of the dimensions of cultural intelligence on practical performance and partial significance on the. Additionally, results demonstrated a strong correlation between performance and loyalty. The results of the study provided new insights regarding cultural intelligence as an important factor for the performance of exhibition employees and underlined the importance of further research on cultural intelligence in the MICE industry.

Risks and Benefits of Late Onset Hypogonadism Treatment: An Expert Opinion

Giovanni Corona,Linda Vignozzi,Alessandra Sforza,Mario Maggi 대한남성과학회 2013 The World Journal of Men's Health Vol.31 No.2

Late-onset hypogonadism (LOH) is a syndromic condition that has a well-recognized association with sexual and reproductive failure. LOH is frequently associated with chronic conditions including cardiovascular diseases (CVD), obesity, osteoporosis, HIV infection, renal failure, and obstructive pulmonary diseases. Despite this evidence, in patients with these conditions, LOH is still only rarely investigated and testosterone replacement therapy (TRT) rarely considered. In this paper, we critically reviewed the available evidence on LOH treatment focusing on possible risks and benefits. Medical therapy of LOH should be individualized depending on the etiology of the disease and the patient’s expectations. The fear of prostate cancer and the risk of erythrocytosis probably represent the main limitations of TRT in aging men. However, TRT in healthy older men in near physiological doses does not appear to incur serious adverse events, although regular monitoring of prostate-specific antigen and hematocrit levels is required. Available evidence also suggests that TRT might ameliorate central obesity and glycometabolic control in patients with metabolic syndrome and type 2 diabetes. In addition, TRT has been associated with an increase in bone mineral density in men with osteoporosis, with an improvement in lean body mass in subjects with human immunodeficiency virus infection or chronic obstructive pulmonary disease, as well as with peripheral oxygenation in patients with chronic kidney diseases. Despite this evidence, however, it should be recognized that the results of these trials were heterogeneous and limited by small sample sizes. Hence, further research is required regarding the long-term benefits and adverse effects of TRT in LOH.