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        • 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>

        • 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>

        • KCI등재

          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.

        • KCI등재

          한반도 南部 終末期 櫛文土器와 繩文土器의 年代的 병행관계 검토

          Okada Ken Ichi(岡田憲一),Ha In Soo(河仁秀) 한국신석기학회 2009 한국신석기연구 Vol.- No.17

          '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

          본고의 목적은 동삼동패총에서 출토된 繩文時代 後期土器를 검토 분석함으로써 한 반도 남부 지역 종말기 즐문토기와 승문토기의 연대적 병행관계를 파악하는데 있다. 검토 결과 동삼동패총에서 출토된 2점의 승문토기는 기존에 알려진 승문시대 후기 후엽의 南福寺式토기 등과는 그 형식과 시기를 달리하며, 지금까지 한반도 남해안지 역에서 발견된 승문토기 중 가장 늦은 승문 후기 중엽에서 후엽에 속하는 형식이다. 이것은 기존에 이중구연토기가 연대적으로 승문시대 후기 중엽으로 막연히 인식되어 왔던 사실을 이번 동삼동 출토 승문토기의 분석과 형식 검토를 통해 그 연대를 내 려볼 수 있게 되었음을 의미한다. 또 하나는, 동삼동패총에서 확인된 승문시대 후기 후반 토기가 일본 서북부 구주지 방이 아닌 동북부 구주지방과의 관련을 짐작해 볼 수 있다 점이다. 지금까지 한반도 에서 확인되는 승문시대 후기 전반까지의 토기 요소는 기본적으로 일본 구주의 서북 부 및 중부 구주지방과 관련성이 높은 것으로 추정되어 왔으며, 阿高式, 南福寺式, 사 까나시다식 토기형식이 이를 증명하고 있다. 하지만, 승문시대 후기 중엽 이후가 되면 일변하여 교류대상 지역이 동북부 구주지방으로 전환했을 가능성도 염두에 둘 필요가 있을 것으로 생각된다. 이러한 사실은 한반도 남부와 일본열도와의 교류가 한정된 지 역내에서 만 지속적으로 이루어 진 것이 아니고, 단속적이며 지역적인 관계가 유연하 였음을 반영하는 것으로 추정된다. The study aims to chronological parallel relationships between late chulmun pottery and jomon pottery in the southern Korean peninsula by reviewing and analyzing pottery excavated from Dongsam-dong shell mound in the jomon period. As the results of study, it shows that two pieces of jomon pottery excavated from Dongsam-dong shell mound have different types and times from the previously known late-nanpuguji type pottery in the late jomon period, and they are types involved in the middle-and-late type of the late jomon period, which is latest among jomon pottery which has been found until now in the southern Korean peninsula. In addition, this data can be a clue to analyze parallel relationships of late jomon pottery through the assemblage relations with chulmun pottery. The end of chulmun pottery in the southern Korean peninsula is related with the late mimanda type pottery stage compared to the chronology of jomon pottery in Japan. Through the finding, the fact, that pottery with double mouth rim has been vaguely considered as the middle-pottery of the late jomon period, was examined chronically through an analysis and type review of jomon pottery excavated in Dongsam-dong. On the other hand, the late-pottery, which is excavated from Dongsam-dong shell mound, in the late jomon period is expected to have the relations with Japan’s northeast Kyushu, not with northwest Kyushu. The pottery elements until the beginning of the late jomon pottery, which has been found in the southern Korean peninsula until now, seem to basically have high correlations with Japan’s northwest and central Kyushu, and adagga type pottery, nanpuguji type pottery, and sagganasida type pottery prove this. However, it needs to consider that interchange areas may transfer to the northeast Kyushu by changing completely from the middle of the late jomon period. Based on the fact, it is estimated to reflect that the interchange between the southern Korean peninsula and Japan was not made only in the designated area continuously, and that intermittent and regional relations were flexible.

        • SCISCIESCOPUSKCI등재

          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.

        • SCISCIESCOPUSKCI등재

          Bendability of Aluminium- and Steel-Clad Chromium Plates

          Okada, Tatsuo,Yoshida, Fusahito,Itoh, Misao,Harada, Yasunori,Ohmori, Masanobu 대한금속재료학회(대한금속학회) 1998 METALS AND MATERIALS International Vol.4 No.3

          The present paper describes how the cladding of chromium plate with dissimilar metals improves the plastic bendability of the chromium. Three-point bending tests at various temperatures were performed for three types of chromium specimens: a monolithic chromium plate, aluminium- and steel-clad chromium plate. The aluminium-clad chromium plate was bent at 343 K up to a bent angle of 90 degrees without failure, even when the chromium layer was located outside of the plate (tension side), while the monolithic chromium plate could be bent exclusively at temperatures above 403 K. When the chromium layer was located inside of the steel-clad chromium plate (compression side), the plate was successfully bent at 307 K. The FE stress analysis of bending proved that the cladding of chromium plates with proper metals of different kinds is effective to reduce the tensile stress in chromium induced during bending and also the residual stress existing after bending operation.

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