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Umeda, I.,Hayakawa, H.,Kamiya, S.,Tanabe, Y. Asian Australasian Association of Animal Productio 1993 Animal Bioscience Vol.6 No.1
Ten-week-old White Leghorn immature males and females were exposed to four lighting regimens: a constant light (12L : 12D); repeated up and slow down (13 min. up and 1 min. down per day for 13 consecutive days, and repeated on two-week cycle) lighting; repeated slow up and down (1 min. up per day for 13 consecutive days and 13 min. down, and repeated on two-week cycle) lighting; and step-up (14 min. up every second week) lighting. At 15 weeks of age, significantly larger testis and comb weights and significantly higher concentrations of plasma LH and testosterone were observed in the cockerels under the repeated slow up and down lighting regimen than those under the other lighting regimens. At 20 weeks of age, significantly larger oviduct weights and significantly higher concentrations of plasma estradiol were observed in the pullets under the repeated up and slow down, and the step-up lighting regimens than those under the other lighting regimens.
Studies of Korean Language in Japan
Umeda Hiroyoki 한국어학회 2003 한국어학 Vol.18 No.-
본고의 목적은 일본에서의 한국어 연구에 대한 경과를 보고하고 전망을 제시하는 데 있다. 먼저 고대와 중세 시대 일본어와 한국어의 관계를 다룬 연구를 소개하고, 한국어 교육의 선구자이며 <린수지> 저자로 알려진 호슈 아메노모리(Hoshu Amenomori)의 업적을 다룬다. 또한 19세기와 20세기 초, 해방 전과 해방 후로 시기를 나누어 한국어에 주요 연구 업적을 요약한다. 대표적인 학자로는 한국어 역사와 음운을 연구한 오구라(Ogura)와 한국어의 현대적인 연구 방법을 정립한 고노(Kono)를 소개한다. 해방 후의 한국어 연구는 음운, 문법, 어휘와 의미에 대한 연구로 확대되었고 특히 일본어와 한국어의 존칭 형태를 비교하는 연구가 두드러진다. 마지막으로 ‘동사 어기( Verbal Base)’설을 비판하고 보편적인 관점에서의 한국어 연구와 교수의 필요성을 제기한다.
Tribological Properties of Sintered Diamonds with WC-Co Matrix
Umeda, Kazunori,Tanaka, Akihiro,Takatsu, Sokichi The Korean Ceramic Society 1997 The Korean journal of ceramics Vol.3 No.3
Sintered diamond/(WC-Co) composites were prepared by spark plasma sintering technique. Tribological properties were measured at temperatures from RT to $500^{\circ}C$ in sliding tests with alumina ball. They show coefficient of friction of 0.1 and below at RT and wear of the diamond composites is hardly detected. Effects of diamond grit size, diamond content and test temperature on the coefficient of friction and the wear are discussed. The wear scars were analyzed.
OBSERVATIONAL STATUS OF THE TEXTURE LARGE-SCALE STRUCTURE FORMATION MODEL
UMEDA HIDEYUKI,FREESE KATHERINE The Korean Astronomical Society 1996 Journal of The Korean Astronomical Society Vol.29 No.suppl1
We reexamined CDM texture large-scale structure (LSS) formation model. We confirmed that texture model is consistent with 4-year COBE data both in an open and a critical matter density (${\Omega}_0$ = 1) universes, and then obtained normalization for density perturbation power spectrum. We next compare the power spectrum with LSS observation data. Contrary to the previous literature, we found that texture model matches with these data in an open universe no better than in an ${\Omega}_0$ = 1 universe. We also found that the model is more likely to fit these data in a cosmological constant dominated ($\Lambda-$) universe.
Umeda Ryo,Iijima Yasushi,Yamakawa Nanako,Kotani Toshiaki,Sakuma Tsuyoshi,Kishida Shunji,Ueno Keisuke,Kajiwara Daisuke,Akazawa Tsutomu,Shiga Yasuhiro,Minami Shohei,Ohtori Seiji,Nakagawa Koichi 대한척추외과학회 2023 Asian Spine Journal Vol.17 No.6
Study Design: Retrospective study.Purpose: To investigate the clinical manifestations of a fragility fracture of the sacrum (FFS) and the factors that may contribute to a misdiagnosis.Overview of Literature: The number of patients diagnosed with FFS has increased because of extended life expectancy and osteoporosis. Patients with FFS may report nonspecific symptoms, such as back, buttock, groin, and/or leg pain, leading to a misdiagnosis and a delay in definitive diagnosis.Methods: Fifty-six patients (13 males and 43 females) with an average age of 80.2±9.2 years admitted to the hospital for FFS between 2006 and 2021 were analyzed retrospectively. The following patient data were collected using medical records: pain regions, a history of trauma, initial diagnoses, and rates of fracture detection using radiography, computed tomography (CT), and magnetic resonance imaging (MRI).Results: Forty-one patients presented with low back and/or buttock pain, nine presented with groin pain, and 17 presented with thigh or leg pain. There was no history of trauma in 18 patients (32%). At the initial visit, 27 patients (48%) were diagnosed with sacral or pelvic fragility fractures. In contrast, 29 patients (52%) were initially misdiagnosed with lumbar spine disease (23 patients), hip joint diseases (three patients), and buttock bruises (three patients). Fracture detection rates for FFS were 2% using radiography, 71% using CT, and 93% using MRI. FFS was diagnosed definitively using an MRI with a coronal short tau inversion recovery (STIR) sequence.Conclusions: Some patients with FFS have leg pain with no history of trauma and are initially misdiagnosed as having lumbar spine disease, hip joint disease, or simple bruises. When these clinical symptoms are reported, we recommend considering FFS as one of the differential diagnoses and performing lumbar or pelvic MRIs, particularly coronal STIR images, to rule out FFS.