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Search Results: 1 - 10 of 1349 matches for " Yuji Ohue "
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Effect of Surface Texturing on Lubricating Condition under Point Contact Using Numerical Analysis  [PDF]
Yuji Ohue, Hideki Tanaka
Engineering (ENG) , 2013, DOI: 10.4236/eng.2013.54050

The contact fatigue life of machine elements is affected by pitting, wear and so on, under heavier loading conditions. Increasing the fatigue life requires mainly the improvements of lubricating condition, operating condition and materials. In order to improve the lubricating condition, it is necessary to investigate the relation of the microscopic surface texturing and the contact modes of machine elements. In this paper, thus, the pressure and oil film thickness of the contact between sphere and the plate with 5 kinds surface texturing were calculated using a commercial software based on Reynolds equation. There was sufficient evidence to suggest that the dimple shape was the optimum texturing to increase the lubricating condition.

Assessment of Head Injury Criterion Score of Shock Attenuation Material Employed around Playground Equipment Using Nonlinear Spring Contact Model  [PDF]
Yuji Ohue, Keita Miyoshi
Open Journal of Safety Science and Technology (OJSST) , 2014, DOI: 10.4236/ojsst.2014.42009
Abstract: In order to investigate the influence factors on HIC (Head Injury Criterion) score of shock attenuation materials employed around playground, impact tests were carried out in accordance with ASTM standard. Four kinds of the commercial shock attenuation materials were employed for the test. The apparatus is composed of the missile made from aluminum alloy with a mass of 4.6 kg and a triaxial accelerometer. The higher the missile was dropped, the more HIC score increased. The HIC score depended on the peak deceleration in collision. From the time-frequency analysis, it was obvious that HIC score depended on the characteristic frequency of the vibration system in collision between the missile and the shock attenuation material. There was sufficient evidence to suggest that the use of a simple vibration system with a nonlinear hardening spring is beneficial to assess HIC score and peak deceleration for the shock attenuation material.
Diagnosis on Surface Failure in Gear Equipment Using Time - Frequency Domain Analysis  [PDF]
Yuji Ohue, Toshiya Kounou, Katsuhiko Yazama
Engineering (ENG) , 2011, DOI: 10.4236/eng.2011.38104
Abstract: In order to make more progress in the gear performance, it is important to evaluate the gear dynamics more precisely, since gear is a main machine element in motion and power transmissions. For preventing the unexpected failure in mechanical systems, a large amount of work has been carried out based on a statistical model developed by Lundberg and Palmgren [1] with reliability models using the classical fatigue theory. However, most of these works did not consider the operating conditions of machine during the fatigue process.
Development of the Irrational Belief Test for Nurses (IBTN): Examination of Reliability and Validity  [PDF]
Takashi Ohue, Michiko Moriyama, Takashi Nakaya
Health (Health) , 2015, DOI: 10.4236/health.2015.73036
Abstract: [Purpose]: The purpose of this study is to develop irrational belief test for nurses, and to examine reliability and validity. [Method]: In study 1, The Irrational belief test for nurses was developed based JIBT-20 (mori et al., 1994) of previous studies. And for the nurse (N = 96, 5 male, 91 female), carried out preliminary investigation, created the provisional version of the Irrational belief test for nurses, and examined factor structure and internal consistency. In study 2, for the nurse (N = 541, 21 male, 520 female) examined validity based on JIBT-20 (Japanese Irrational Belief Test), MBI (Maslach Burnout Inventory), ATQ-R Japanese version (Automatic Thoughts Questionnare-Revised), and for the nurse (N = 91, 3 male, 88 female) examined a test-retest reliability four weeks afterward before long. [Result]: As a result of the explanatory factor analysis by a maximum likelihood estimation and promax rotation, 28-item 7 factors were extracted and was named a “patient belief”, “self-expectation”, “avoidance”, “self-inhibition”, “Ethical blame”, “helplessness”, and “dependence”. Moreover, as a result of conducting confirmation factor analysis, the hypothetical model obtained by explanatory factor analysis fitted (GFI = 0.89, AGFI = 0.86). About the reliability of the measure, a Cronbach’s alpha coefficient is 0.68 - 0.82, and a test-retest reliability is 0.64 and reliability is affirmed. About construct validity was checked correlation with JIBT-20, and about criterion validity was checked the correlation with MBI and ATQ-R Japanese-translation version. [Conclusion]: It is suggested that reliability and validity are verified and the irrational belief test for nurses is a useful measure. The developed test can be used to measure the irrational belief in the context of burnout in nurses.
The Effect of the Group Cognitive Behavior Therapy in a Nurse’s Burnout and Intention to Resign  [PDF]
Takashi Ohue, Michiko Moriyama, Takashi Nakaya
Health (Health) , 2015, DOI: 10.4236/health.2015.710139
Abstract: Purpose: The purpose of the present study was to decrease burnout and intention to resign by practicing cognitive behavioral approach to nurses of the 3 years nursing clinical experience. Methods: Nurses (N = 180) who worked at acute-care hospitals and whose clinical experience was 3 years were requested. Nurses (n = 95, male 5, female 90) who were able to do participation at all the sessions were objects. The program was created and carried out for a nurse’s burnout with reference to cognitive behavior therapy. Evaluation of intervention was asked to complete a questionnaire that measured burnout (MBI), job stressors (NJSS), automatic thoughts (the shorter version of Japanese version ATQ-R), Irrational Belief Test for Nurses (IBTN), coping measure and whether or not they had an intention to resign. Measurement was performed 3 times of a baseline, after the end of session and follow-up. Analysis of covariance which adjusted the baseline level was performed. Result: According to the results, “helplessness”, “positive thinking” and “personal accomplishment” were significant (p < 0.01). According to the results of Friedman test, significant difference was observed in “emotional exhaustion” in the group with low degree of irrational belief (p < 0.10 ) and in the group with high degree (p < 0.05). With regard to the intention to leave the job, “wants to continue working as a nurse” was significant in the group in 3 months after intervention (p < 0.05). Conclusion: It is suggested that cognitive behavioral approach appears to be effective for reducing nurse’s burnout or intention to resign in nurses of the 3 years nursing clinical experience.
Comparison of Factors Related to Elderly People’s Purpose of Life in Japan and Thailand  [PDF]
Takashi Ohue, Darunee Rujkorakarn, Amorn Suwannimitr, Supaporn Aryamuang, Nongyaow Meethien
Health (Health) , 2015, DOI: 10.4236/health.2015.710148
Abstract: Purpose: In the present study, the features of “purpose of life” of elderly persons in Japan and Thailand are clarified by focusing on this concept and its related factors, and through the comparison of the results of Japan and Thailand. Methods: The Japanese subjects consist of the elderly aged 60 or older. The Thai subjects consist of the elderly aged 60 or older who live in Thailand. A sum of 250 subjects (men and women) per country will be studied. They were asked about their individual attribution and maintenance of healthy condition. Moreover, 19 items were examined as events leading to life purpose. These items were measured using the Philadelphia Geriatric Center Morale Scale, General Health Questionnaire (GHQ) and Instrumental Activities of Daily Living (IADL). Results: Data from 200 elderly people (male: 67, female: 133) in Thailand and 234 elderly people (male: 49, female: 185) in Japan were used in the analysis. Regarding an “Events Leading to Life Purpose,” it was suggested that “activities to enhance learning and culture” and “neighbors and friends, and socializing with acquaintances” helped both in Japan and Thailand. Moreover, “elderly persons’ club activities” and “child” were effective in Thailand, while “spouse” and “grandchild” were effective in Japan. Moreover, Model 1 (event, disease → purpose of life → mental health, and IADL) that became purpose of life for both countries was adopted. Conclusion: In order to improve older adults’ mental health and ADL by improving “purpose of life”, it is required to increase the events leading to life purpose and to prevent illness for both countries. In particular, “activities to enhance learning and culture” and “neighbors and friends, and socializing with acquaintances” was the activity which raises “purpose of life”. Then, “elderly persons’ club activities” and “child” were effective in Thailand, while “spouse” and “grandchild” were effective in Japan.
On the Generalization of Hilbert’s 17th Problem and Pythagorean Fields  [PDF]
Yuji Shimizuike
Advances in Pure Mathematics (APM) , 2013, DOI: 10.4236/apm.2013.37A001

The notion of preordering, which is a generalization of the notion of ordering, has been introduced by Serre. On the other hand, the notion of round quadratic forms has been introduced by Witt. Based on these ideas, it is here shown that 1) a field F is formally real n-pythagorean iff the nth radical, RnF is a preordering (Theorem 2), and 2) a field F is n-pythagorean iff for any n-fold Pfister form ρ. There exists an odd integer l(>1) such that l×ρ is a round quadratic form (Theorem 8). By considering upper bounds for the number of squares on Pfister’s interpretation, these results finally lead to the main result (Theorem 10) such that the generalization of pythagorean fields coincides with the generalization of Hilbert’s 17th Problem.

Observation of Environmental Stress Cracking in Polymethylmethacrylate by Using the Chemiluminescence Method  [PDF]
Yuji Higuchi
Materials Sciences and Applications (MSA) , 2015, DOI: 10.4236/msa.2015.611107
Abstract: Polymethylmethacrylate (PMMA) is highly regarded for its transparency, and is used in such products as cameras and Video Tape Recorders as plastic lenses to take advantage of its excellent optical properties. Also, it is used in numerous other industrial fields like automobile lamp lenses, billboards, and lighting equipment. The phenomenon of environmental stress cracking is known to occur in PMMA due to ethanol, and there are cases when this may become a factor which causes damage of molded products. In the present paper, upon close observation by using the method of chemiluminescence in order to elucidate the mechanism by which this environmental stress cracking occurs, we report that we are able to capture the formation of a radical at the moment of cracking.
The Change in Self-Esteem among Middle School Students in Japan, 1989-2002  [PDF]
Yuji Ogihara
Psychology (PSYCH) , 2016, DOI: 10.4236/psych.2016.711136
Abstract: This paper examined temporal changes in self-esteem among middle school students in Japan from 1989 to 2002. Previous research showed that self-esteem decreased among middle school students between 1999 and 2006. However, it was unclear whether such a decrease was also present in other periods of time. To obtain a better understanding of how people adapt to socio-economic environments, it is important to gain a more comprehensive view of such long-term cultural/social changes. Therefore, to supplement the findings of the existing research on changes in self-esteem, we analyzed large-sample time-series data collected in Japan in 1989 and 2002. We found that middle schoolers’ self-esteem decreased from 1989 to 2002, consistent with previous research. Thus, our study extends the previous research by presenting additional data showing the decrease in self-esteem in Japan.
Rheological Behavior of Nanosilica Suspensions in Poly(Ethylene Oxide) Solutions with Sodium Chloride  [PDF]
Yuji Hirose
Materials Sciences and Applications (MSA) , 2017, DOI: 10.4236/msa.2017.85022
Abstract: Suspensions of silica nanoparticles showed shear-thickening profiles under steady shear conditions up on addition of a small amount of poly(ethylene oxide) (PEO). The suspensions turned into gels upon shaking and their fluidity was recovered several minutes after resting. We studied the rheological properties of these shake gels with small amounts of sodium chloride (NaCl). Gelation occurred at lower shear rates upon addition of small amounts of NaCl. In addition, the time taken by the gelated samples to recover their original viscosity increased with the increasing NaCl content. The weakened repulsive interactions between the silica particles upon NaCl addition lead to particles in closer proximity, and three-dimensional networks of PEO chains are easily formed as the electric double layer of the particles becomes thinner.
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