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Search Results: 1 - 10 of 2846 matches for " Kei Inoue "
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On the Quantum Zeno Effect and Time Series Related to Quantum Measurements  [PDF]
Karl-Heinz Fichtner, Kei Inoue
Applied Mathematics (AM) , 2013, DOI: 10.4236/am.2013.410A3008

Our main aim is to prove a more general version of the quantum Zeno effect. Then we discuss some examples of the quantum Zeno effect. Furthermore, we discuss a possibility that based on the quantum Zeno effect and certain experiments one could check whether, from the statistical point of view, a concrete system behaves like a quantum system. The more general version of quantum Zeno effect can be helpful to prove that the brain acts like in a quantum system. The proof of our main result is based on certain formulas describing probability distributions of time series related to quantum measurements.

Efficient Protein Transduction Method Using Cationic Peptides and Lipids
Kei Yamaguchi,Mari Inoue,Naoki Goshima
Journal of Biomedicine and Biotechnology , 2011, DOI: 10.1155/2011/872065
Abstract: Cationic peptides termed protein transduction domains (PTDs) have been shown to cross biological membranes efficiently. However, proteins transduced by PTDs become entrapped within the endosomal vesicles and are not delivered into organelles. We have developed a novel protein delivery system to enhance the proton sponge effect, which results in rupture of the endosomes, by using a mixture of Wr-T transporter peptide and a commercially available cationic lipid reagent. This peptide and cationic lipid reagent mixture efficiently delivers a variety of cargo proteins into living cells by releasing them from the endosomes.
Vitrectomy combined with glial tissue removal at the optic pit in a patient with optic disc pit maculopathy: a case report
Makoto Inoue, Kei Shinoda, Susumu Ishida
Journal of Medical Case Reports , 2008, DOI: 10.1186/1752-1947-2-103
Abstract: A 45-year-old man complained of blurred vision, and ophthalmoscopy revealed a retinal detachment and retinoschisis extending from an optic disc pit through the macula in his left eye. He was diagnosed with optic disc pit maculopathy, and vitrectomy was performed. A posterior vitreous detachment was created, glial tissue at the optic pit was removed, and octafluoropropane (C3F8) was injected as a gas tamponade. The retinal detachment and retinoschisis disappeared after six months, and vision improved to 20/20 without any visual field defects (Goldmann perimetry). A cataractous lens was extracted 2 years after the vitrectomy, and vision has remained 20/20 for 10 years without any recurrence.The removal of glial tissue during vitrectomy may be beneficial in patients with optic disc pit maculopathy.Optic disc pit maculopathy is characterized by a congenital optic disc pit associated with a macular detachment and retinoschisis [1]. Focal laser photocoagulation of the temporal juxtapapillary retina or vitrectomy combined with a gas tamponade has been reported to be effective in treating this syndrome [1,2]. However, a relatively high incidence of recurrence has been reported after laser treatment alone [1]. A combination of both procedures has recently been reported to be an effective treatment [3].Glial tissue is occasionally seen in the optic disc pit of patients with an optic disc pit or coloboma, but the reason for its development is unknown. We report a case of a man with optic disc pit maculopathy that was successfully treated using vitrectomy combined with the removal of glial tissue from the optic disc pit followed by the use a gas tamponade.A 45-year-old Japanese man visited our clinic in September 1996 complaining of decreased vision in his left eye. His vision was decreased to 20/200, and ophthalmoscopy showed a retinal detachment involving the macula and a retinoschisis that extended from the optic disc pit through the macula in the left eye (Figure 1A). Glial
Conservative management of cervical pregnancy: The utility of methotrexate treatment and uterine artery embolization  [PDF]
Hisashi Masuyama, Seiji Inoue, Etsuko Nobumoto, Kei Hayata, Tomonori Segawa, Yuji Hiramatsu
Open Journal of Obstetrics and Gynecology (OJOG) , 2013, DOI: 10.4236/ojog.2013.310131

The aim of this retrospective case series report is to evaluate systemic methotrexate therapy in conjunction with uterine artery embolization (UAE) in the conservative management of cervical pregnancy. We examined clinical presentations, treatments, and therapeutic outcomes in fifteen patients with a cervical pregnancy who wished for preservation of fertility, treated at Okayama University Hospital between 1998 and 2012. Twelve patients received systemic methotrexate including five treated with UAE. One was treated with UAE alone. Two patients received neither UAE nor methotrexate because of a low human chorionic gonadotropin (hCG) level and poor blood flow around the gestational sac (GS). An increased GS size and the elevated hCG level during methotrexate therapy might be risk factors for emergent UAE. Two of six patients treated with UAE had subsequent confirmed viable pregnancies. In patients with a cervical pregnancy, methotrexate therapy in combination with UAE can be considered as an option before performing a hysterectomy with suitable counseling about the risk of loss of fertility. Careful observation of the GS size and hCG level during methotrexate therapy might be important for management.

A Description of Quantum Chaos
Kei Inoue,Andrzej Kossakowski,Masanori Ohya
Physics , 2004,
Abstract: A measure describing the chaos of a dynamics was introduced by two complexities in information dynamics, and it is called the chaos degree. In particular, the entropic chaos degree has been used to characterized several dynamical maps such that logistis, Baker's, Tinckerbel's in classical or quantum systems. In this paper, we give a new treatment of quantum chaos by defining the entropic chaos degree for quantum transition dynamics, and we prove that every non-chaotic quantum dynamics, e.g., dissipative dynamics, has zero chaos degree. A quantum spin 1/2 system is studied by our chaos degree, and it is shown that this degree well describes the chaotic behavior of the spin system.
Application of chaos degree to some dynamical systems
Kei Inoue,Masanori Ohya,Keiko Sato
Physics , 1998,
Abstract: Chaos degree defined through two complexities in information dynamics is applied to some deterministic dynamical models. It is shown that this degree well describes the chaostic feature of the models.
New approach to Epsilon-entropy and Its comparison with Kolmogorov's Epsilon-entropy
Kei Inoue,Takashi Matsuoka,Masanori Ohya
Physics , 1998,
Abstract: Kolmogorov introduced a concept of Epsilon-entropy to analyze information in classical continuous system. The fractal dimension of geometrical sets was introduced by Mandelbrot as a new criterion to analyze the complexity of these sets. The Epsilon-entropy and the fractal dimension of a state in general quantum system were introduced by one of the present authors in order to characterize chaotic properties of general states. In this paper, we show that Epsilon-entropy of a state includes Kolmogorov Epsilon-entropy, and the fractal dimension of a state describe fractal structure of Gaussian measures.
Optimal intertemporal risk allocation applied to insurance pricing
Kei Fukuda,Akihiko Inoue,Yumiharu Nakano
Mathematics , 2007,
Abstract: We present a general approach to the pricing of products in finance and insurance in the multi-period setting. It is a combination of the utility indifference pricing and optimal intertemporal risk allocation. We give a characterization of the optimal intertemporal risk allocation by a first order condition. Applying this result to the exponential utility function, we obtain an essentially new type of premium calculation method for a popular type of multi-period insurance contract. This method is simple and can be easily implemented numerically. We see that the results of numerical calculations are well coincident with the risk loading level determined by traditional practices. The results also suggest a possible implied utility approach to insurance pricing.
Dynamic risk diversification and insurance premium principles
Kei Fukuda,Akihiko Inoue,Yumiharu Nakano
Mathematics , 2009,
Abstract: We present an approach to the dynamic valuation of exposure risks in the multi-period setting, which incorporates a dynamic and multiple diversification of risks in Pareto optimal sense. This approach extends classical indifference premium principles and can be applied for the valuation of insurance risks. In particular, our method produces explicit computation formulas for the dynamic version of the exponential premium principles. Moreover, we show limit theorems asserting that the risk loading for our valuation decreases to zero when the number of divisions of a risk goes to infinity.
Combined vitreous and cataract surgeries in highly hyperopic eye
Makoto Inoue, Kei Shinoda, Tomoko Matsuda-Yamamitsu, et al.
Clinical Ophthalmology , 2010, DOI: http://dx.doi.org/10.2147/OPTH.S13051
Abstract: mbined vitreous and cataract surgeries in highly hyperopic eye Case report (3514) Total Article Views Authors: Makoto Inoue, Kei Shinoda, Tomoko Matsuda-Yamamitsu, et al. Published Date September 2010 Volume 2010:4 Pages 1003 - 1005 DOI: http://dx.doi.org/10.2147/OPTH.S13051 Makoto Inoue1,2, Kei Shinoda3, Tomoko Matsuda-Yamamitsu2, Ronaldo Yuiti Sano1, Susumu Ishida2,4 1Kyorin Eye Center, Kyorin University School of Medicine, Mitaka, Tokyo, Japan; 2Department of Ophthalmology, Keio University School of Medicine, Shinjuku, Tokyo, Japan; 3Department of Ophthalmology, Teikyo University School of Medicine, Itabashi, Tokyo, Japan; 4Department of Ophthalmology, Hokkaido University School of Medicine, Sapporo, Hokkaido, Japan Abstract: We report a case of a patient with a highly hyperopic eye who underwent cataract surgery combined with vitreous surgery to create a posterior vitreous detachment (PVD) to prevent choroidal neovascularization (CNV). A 78-year-old man noticed a decrease in his vision due to a cataract in his right eye. The patient had a severe visual loss in his left eye because of a CNV 2 years after a cataract surgery. His visual acuities were 20/30 OD and 20/600 OS, and funduscopic examination showed an orange-colored lesion OD and degenerative subretinal fibrosis OS. The posterior vitreous was attached to the retina in both eyes. The axial length was 18.9 mm OD and 19.0 mm OS. Cataract surgery combined with vitreous surgery to create PVD was performed on the right eye, and the vision improved to 20/20 with no signs of developing CNV after 5 years. We conclude that cataract surgery combined with vitreous surgery to create a PVD may prevent the development of CNV in highly hyperopic eyes.
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