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Radiative seesaw mechanism in a minimal 3-3-1 model
Okada, Hiroshi,Okada, Nobuchika,Orikasa, Yuta American Physical Society 2016 Physical Review D Vol.93 No.7
<P>We study the neutrino sector in a minimal SU(3)(L) x U(1)(X) model, in which its mass is generated at a one-loop level with the charged lepton mass, and hence, there exists a strong correlation between the charged-lepton mass and the neutrino mass. We identify the parameter region of this model to satisfy the current neutrino oscillation data as well as the constraints on lepton flavor violating processes. We also discuss a possibility to explain the muon anomalous magnetic moment.</P>
Higgs phenomenology in the minimalSU(3)L×U(1)Xmodel
Okada, Hiroshi,Okada, Nobuchika,Orikasa, Yuta,Yagyu, Kei American Physical Society 2016 Physical Review D Vol.94 No.1
<P>We investigate the phenomenology of a model based on the SU(3)(c) x SU(3)(L) x U(1)(X) gauge theory, the so-called 331 model. In particular, we focus on the Higgs sector of the model which is composed of three SU(3)L triplet Higgs fields and is the minimal form for realizing a phenomenologically acceptable scenario. After the spontaneous symmetry breaking SU(3)(L) x U(1)(X) -> SU(2)(L) x U(1)(Y), our Higgs sector effectively becomes that with two SU(2)(L) doublet scalar fields, in which the first-and the second-generation quarks couple to a different Higgs doublet from that which couples to the third-generation quarks. This structure causes the flavor-changing neutral current mediated by Higgs bosons at the tree level. By taking an alignment limit of the mass matrix for the CP-even Higgs bosons, which is naturally realized in the case with the breaking scale of SU(3)(L) x U(1)(X) much larger than that of SU(2)(L) x U(1)(Y), we can avoid current constraints from flavor experiments such as the B-0-(B) over bar (0) mixing even for the Higgs bosons masses that are O(100) GeV. In this allowed parameter space, we clarify that a characteristic deviation in quark Yukawa couplings of the Standard Model-like Higgs boson is predicted, which has a different pattern from that seen in two Higgs doublet models with a softly broken Z(2) symmetry. We also find that the flavor-violating decay modes of the extra Higgs boson, e.g., H/A -> tc and H-+/- -> ts, can be dominant, and they yield the important signature to distinguish our model from the two Higgs doublet models.</P>
Erythema Nodosum Masking Kawasaki Disease with an Initial Manifestation of Skin Lesions
Seigo Okada,Yuichi Ishikawa,Maiko Shimomura,Shinpei Sunagawa,Reiji Hirano,Shinnosuke Fukunaga,Akiko Miyake,Yusuke Okada,Takashi Maki 연세대학교의과대학 2019 Yonsei medical journal Vol.60 No.3
We report the first case demonstrating an association between Kawasaki disease (KD) and erythema nodosum (EN). A 3-year-oldgirl presented with EN as an initial manifestation of KD. At the initial visit, she showed high fever of 40°C, injection of the oropharynx,cervical lymphadenopathy, and red-purple cutaneous nodules, particularly on the lower limbs. She complained of severepain in the neck and cutaneous lesions. Initially, the development of EN was attributed to Salmonella spp infection, which wasdetected in stool culture. However, the patient did not respond to high-dose ampicillin/sulbactam to which the Salmonella spp issensitive. Echocardiography performed as screening for fever of unknown origin revealed medium-sized aneurysms of the leftanterior descending artery. EN masked the diagnosis of KD, and the patient developed a coronary artery lesion. KD should beconsidered in the differential diagnosis of refractory EN in pediatric patients.
Can a Higgs portal Dark Matter be compatible with the anti-proton cosmic-ray?
Okada, H.,Toma, T. North-Holland Pub. Co 2012 Physics letters: B Vol.713 No.3
Recent direct detection experiments of Dark Matter (DM), CoGeNT and DAMA implicate a light DM of a few GeV. Such a light DM would generate a large amount of anti-proton since suppression for anti-proton flux from DM annihilation is ineffective. We discuss whether a light dark matter with mass of 5-15 GeV, which is especially in favor of the recent experiments reported by CoGeNT, is compatible with the anti-proton no excess in the cosmic-ray. In view of the direct detection of DM and no anti-proton excess in the cosmic-ray both, we show that a Dirac DM is favored than a scalar one since there is no s-wave of the annihilation cross section for the Dirac DM. A large elastic cross section for direct detection can be obtained through the additional light Higgs exchange. We show an allowed region that simultaneously satisfies the DM relic density, the elastic cross section favored by CoGeNT and also the constraint of H<SUB>L</SUB>ZZ coupling of the light Higgs boson by LEP.
Explainable artificial intelligence in emergency medicine: an overview
Okada Yohei,Ning Yilin,Ong Marcus Eng Hock 대한응급의학회 2023 Clinical and Experimental Emergency Medicine Vol.10 No.4
Artificial intelligence (AI) and machine learning (ML) have potential to revolutionize emergency medical care by enhancing triage systems, improving diagnostic accuracy, refining prognostication, and optimizing various aspects of clinical care. However, as clinicians often lack AI expertise, they might perceive AI as a “black box,” leading to trust issues. To address this, “explainable AI,” which teaches AI functionalities to end-users, is important. This review presents the definitions, importance, and role of explainable AI, as well as potential challenges in emergency medicine. First, we introduce the terms explainability, interpretability, and transparency of AI models. These terms sound similar but have different roles in discussion of AI. Second, we indicate that explainable AI is required in clinical settings for reasons of justification, control, improvement, and discovery and provide examples. Third, we describe three major categories of explainability: pre-modeling explainability, interpretable models, and post-modeling explainability and present examples (especially for post-modeling explainability), such as visualization, simplification, text justification, and feature relevance. Last, we show the challenges of implementing AI and ML models in clinical settings and highlight the importance of collaboration between clinicians, developers, and researchers. This paper summarizes the concept of “explainable AI” for emergency medicine clinicians. This review may help clinicians understand explainable AI in emergency contexts.
Institutions, Corporate Environment and Transformation of Japanese Management
Okada, Yoshitaka THE MANAGEMENT RESEARCH CENTRE YONSEI UNIVERSITY 1998 SANGNAM FORUM Vol.1 No.1
Japanese firms effectively coped with economic difficulties in the 50s and 60s by reemphasizing some traditional human-relation-oriented social norms and implementing diverse mechanisms to promote harmony and cooperation in intra-and inter-firm relations. Consequently, they greatly benefited from synergetic effects, and developed the cooperation-oriented business system. Stability generated from such development, however, could not deal with turbulent corporate environment in the 70s and 80s. Japanese firms needed to generate flexibility and dynamics, but without losing the benefits of synergeic effects. They implemented diverse competitive mechanisms, to the extent that benefits from intensive cooperative activities were not significantly reduced. Such competitive-cum-cooperative (CCC) business system enabled them to benefit from both synergetic and market-like effects. Even facing new corporate environment in the 90s, they are implementing practices. not much deviating from the CCC system. The nenpo system, applied mostly to managers, increases a proportion of performance payment, while it guarantees the minimum amount based on nenko wages or qualification, or with a fixed amount. Its purpose is to preserve the benefits of synergetic effects, while increase of the proportion of performance payment requires more effective monitoring and fairer evaluation, stimulates intrafirm competition, and generates flexibility and openness. The increase rather functions to make psychological and motivational stimulation to highly cooperation-oriented Japanese management, not to replace the management with a new one. Evidence indicates that the Japanese business systems have been evolving by reinterpreting the social norms of interpersonalism, without deviating drastically from its path dependent characteristics.
Ti - V - Cr BCC Alloys System with High Protium Content
Okada, M,Kuriiwa, T,Tamura, T,Takamura, H,Kamegawa, A 대한금속재료학회(대한금속학회) 2001 METALS AND MATERIALS International Vol.7 No.1
This paper aims to study the relationship between the protium absorption properties and alloy composition of Ti-V-Cr alloys. We studied the effects of composition of the alloys and the heat-treatment on the protium absorption-desorption properties of Ti-V-Cr alloys, and found that Ti-35V-40Cr alloys show 2.6 mass% protium capacity. The plateau pressure of the alloys increased with decreasing lattice constants, resulting from increasing Cr content. The main phase of the samples containing more than 15%V was a BCC phase in the cast state. These BCC phase alloys exhibited 2.4 mass% protium. It was also found that the heat-treatment was effective in stabilizing a BCC structure in Ti-V-Cr alloys with low V content. The alloy yields the high capacity of 3.0 mass% protium capacity, which will be the highest value at 313 K reported so far. The alloy will be promising since it contains a low amount of the expensive V element.