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Search Results: 1 - 10 of 1046 matches for " Rina Miyazaki "
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Diagnosis and Management of Extracranial Head and Neck Schwannomas: A Review of 27 Cases
Ryuji Yasumatsu,Torahiko Nakashima,Rina Miyazaki,Yuichi Segawa,Shizuo Komune
International Journal of Otolaryngology , 2013, DOI: 10.1155/2013/973045
Abstract: Objectives. Clinical records of 27 patients with extracranial head and neck schwannoma were retrospectively reviewed. Methods. Ultrasonography (US) was performed in all cases. Seven patients underwent CT. Twenty-five patients underwent MRI. Fine needle aspiration cytology (FNAC) was performed for 12 of the 27 patients. Clinical history, surgical data, and postoperative morbidity were analyzed. Results. The images of US showed a well-defined, hypoechoic, primarily homogeneous solid mass. At CT, only one of 7 cases (14%) was able to suggest the diagnosis of schwannoma. At MRI, twenty of 25 cases (80%) suggested the diagnosis of schwannoma. Only three of 12 cases (25%) displayed a specific diagnosis of schwannoma rendered on FNAC. The distribution of 27 nerves of origin was 10 (37%) vagus nerves, 6 (22%) sympathetic trunks, 5 (19%) cervical plexuses, 3 (11%) brachial plexuses, 2 (7%) hypoglossal nerves, and 1 (4%) accessory nerve. Complete tumor resection was performed in 11 patients, and intracapsular enucleation of the tumor was performed in 16 patients. The rate of nerve palsy was 100 (11/11) and 31% (5/16). Conclusions. MRI is sensitive and specific in the diagnosis of schwannoma. Intracapsular enucleation was an effective and feasible method for preserving the neurological functions. 1. Introduction Schwannoma is a benign neural sheath tumor, and it occurs in overall body areas including the head and neck region. As a slowly growing benign tumor, it has been reported that 25 to 45% of schwannomas were located in the extracranial head and neck region [1]. It involves the cranial nerves such as V, VII, X, XI, and XII or sympathetic and peripheral nerves [2]. Preoperative diagnostic investigations included ultrasonography (US), computed tomography (CT), magnetic resonance imaging (MRI), and fine needle aspiration cytology (FNAC) [3–5]. However, the preoperative diagnosis of schwannoma is difficult and should be suggested by clinical features and supported by investigations. As for the management of schwannomas, multiple treatment options exist including observation, complete tumor excision, and intracapsular enucleation [6, 7]. For tumors arising from the major cranial nerves, complete tumor resection renders lifelong morbidity to the patients. On the other hand, the nerve-preserving excision method, such as intracapsular enucleation, does not guarantee intact nerve function after surgery. Because of the substantial chance of nerve palsy after operation, obtaining an accurate preoperative diagnosis, and preferably, with the identification of the nerve of
A Comment on Reis  [PDF]
Kenji Miyazaki
Theoretical Economics Letters (TEL) , 2011, DOI: 10.4236/tel.2011.13019
Abstract: This note gives a counterexample on Reis [1]. Using a certain family of utility functions, this note not only gives a sharper representation than that of Reis but also demonstrates that interest rate inelastic money demand does not lead to superneutrality. This implies that superneutrality does not exist when uncerinty is introduced.
Incentives in Public and Privatized Firms under Incomplete Contracting Situations  [PDF]
Takeshi Miyazaki
Theoretical Economics Letters (TEL) , 2012, DOI: 10.4236/tel.2012.23059
Abstract: It is argued that incentives for employees in the public service agencies will necessarily be weak because of the multiple dimensions of products, multiple principals, incomplete contract, and socializing. Some empirical studies refer to incomplete contracting situations as part of the cause of the diminishing of the public sector. This work investigates the effects of privatization and ownership shares on incentive schemes for employees who work for public or privatized firms under incomplete contracting situations. Two main results are obtained. First, the incentive intensity of public firms decreases as the government has more ownership shares, and the social benefit declines. Second, privatized firms offer their employees higher-powered incentive contracts than do public firms.
An Investigation on the Effect of Migration Strategy on Parallel GA-Based Shortest Path Routing Algorithm  [PDF]
Salman Yussof, Rina Azlin Razali
Communications and Network (CN) , 2012, DOI: 10.4236/cn.2012.42013
Abstract: Genetic algorithm (GA) is one of the alternative approaches for solving the shortest path routing problem. In previous work, we have developed a coarse-grained parallel GA-based shortest path routing algorithm. With parallel GA, there is a GA operator called migration, where a chromosome is taken from one sub-population to replace a chromosome in another sub-population. Which chromosome to be taken and replaced is subjected to the migration strategy used. There are four different migration strategies that can be employed: best replace worst, best replace random, random replace worst, and random replace random. In this paper, we are going to evaluate the effect of different migration strategies on the parallel GA-based routing algorithm that has been developed in the previous work. Theoretically, the migration strategy best replace worst should perform better than the other strategies. However, result from simulation shows that even though the migration strategy best replace worst performs better most of the time, there are situations when one of the other strategies can perform just as well, or sometimes better.
A neuropsychological evaluation of orthorexia nervosa  [PDF]
Nancy S. Koven, Rina Senbonmatsu
Open Journal of Psychiatry (OJPsych) , 2013, DOI: 10.4236/ojpsych.2013.32019
Abstract:

Orthorexia nervosa (ON) describes a fixation for proper nutrition and healthy foods that leads to die-tary restrictions and nutritional deficiencies over time. Given symptom overlap among ON, obsessive-compulsive disorder (OCD), and anorexia nervosa (AN), this study examines whether ON has a unique neuropsychological profile. Participants completed symptom checklists and neuropsychological tests chosen for their sensitivity to AN and OCD. Results showed that, across the full sample, ON is independently associated with self-reported weaknesses in Set-Shifting, Emotional Control, Self-Monitoring, and Working Memory. After controlling for AN and OCD variables, high- and low-ON groups differed in total correct trials on the Wisconsin Card Sorting Test. These areas of executive functioning, which are explained in the context of ON symptomatology, represent what would be considered the neuropsychological overlap among OCD and AN profiles.


La comunicación para la salud como disciplina en las universidades estadounidenses
Alcalay,Rina;
Revista Panamericana de Salud Pública , 1999, DOI: 10.1590/S1020-49891999000300020
Abstract: this article analyzes the state of development of communications related to health in universities of the united states of america. this specialty is essential for people's well-being, and it involves interpersonal, organizational, and mass communications. in the united states, communications for health promotion is an area of applied communications with social relevance and generally performed in interdisciplinary settings. a number of universities in the united states offer communications master's degree programs with an emphasis on health. however, so far, the only program with a formal graduate degree in health and communications is one jointly offered by the emerson university department of communications and the tufts school of medicine. developing and including this specialization in the schools of communications in latin america is crucial to improving the quality of life of the peoples of the continent.
The time concept of Grade 11 learners and that of their parents
Rina Grobler
South African Journal of Education , 2005,
Abstract:
Unstable periodic wave solutions of Nerve Axion diffusion equations
Rina Ling
International Journal of Mathematics and Mathematical Sciences , 1987, DOI: 10.1155/s0161171287000875
Abstract: Unstable periodic solutions of systems of parabolic equations are studied. Special attention is given to the existence and stability of solutions.
Reducing increasing monotonicity of kernels
Rina Ling
International Journal of Mathematics and Mathematical Sciences , 1984, DOI: 10.1155/s0161171284000090
Abstract: Integral equations with positive increasing kernels are transformed into ones with positive decreasing kernels, and using a similar technique, more positive increasing kernels are reduced to ones with less increasing monotonicity.
Solutions of singular integral equations
Rina Ling
International Journal of Mathematics and Mathematical Sciences , 1982, DOI: 10.1155/s016117128200012x
Abstract: Qualitative behavior of solutions of possibly singluar integral equations is studied. It includes properties such as positivity, boundedness and monotonicity of the solutions of the infinite interval.
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