- 著者
- Takayuki Yamada Susumu Ohwada
- 出版者
- The Kitakanto Medical Society
- 雑誌
- 北関東医学 (ISSN:13432826)
- 巻号頁・発行日
- vol.72, no.1, pp.87-89, 2022-02-01 (Released:2022-03-18)
- 参考文献数
- 8
Axillary lymphadenopathy is a local reaction to mRNA COVID-19 vaccination. A 19-year-old healthy woman presented with a mass in the axilla diagnosed by ultrasonography as a result of COVID-19 vaccine-induced hyperreactive lymphadenopathy. After two weeks, ultrasonography revealed that the lymph node had shrunk and that the blood flow signal in the hilum had disappeared. This case describes the typical course of isolated unilateral axillary lymphadenopathy after BNT162b2 COVID-19 vaccination. Short-term ultrasound is sufficient for monitoring unilateral axillary lymphadenopathy following recent COVID-19 vaccination, avoiding unnecessary radiation injury and axillary lymph node biopsies.
- 著者
- 山田 貴之 松本 隆行 後藤 顕一 稲田 佳彦 岡崎 正和 小林 辰至 Takayuki YAMADA Takayuki MATSUMOTO Kenichi GOTO Yoshihiko INADA Masakazu OKAZAKI Tatsushi KOBAYASHI
- 出版者
- 上越教育大学
- 雑誌
- 上越教育大学研究紀要 = Bulletin of Joetsu University of Education (ISSN:24359629)
- 巻号頁・発行日
- vol.40, no.2, pp.615-629, 2021-03-31
- 著者
- Takayuki YAMADA Shinji NISHIWAKI Kazuhiro IZUI Masataka YOSHIMURA Akihiro TAKEZAWA
- 出版者
- The Japan Society of Mechanical Engineers
- 雑誌
- Journal of Environment and Engineering (ISSN:1880988X)
- 巻号頁・発行日
- vol.6, no.3, pp.567-578, 2011 (Released:2011-04-15)
- 参考文献数
- 18
- 被引用文献数
- 2 4
Topology optimization has been successfully used in many industries, especially those engaged in the design and manufacturing of mechanical devices, but numerical problems are often encountered, such as grayscale representations of obtained composites. A type of structural optimization method using the level set theory for boundary expressions has been proposed, in which the outlines of target structures are implicitly represented using the level set function, and optimal configurations are obtained by updating this function based on the shape sensitivities. Level set-based methods typically have a drawback, however, in that topological changes that increase the number of holes in the material domain are not allowed. To overcome the above numerical and topological problems, this paper proposes a new topology optimization method incorporating level set boundary expressions based on the concept of the phase field method, which we apply to a minimum mean compliance problem. First, a structural optimization problem is formulated based on a boundary expression, using the level set function. Next, a time evolutionary equation for updating the level set function is formulated based on the concept of the phase field method, and the minimum mean compliance problem is formulated using a level set boundary expression. An optimization algorithm for the topology optimization incorporating the level set boundary expression based on the concept of the phase field method is then derived. Several examples are provided to confirm the usefulness of the proposed structural topology optimization method.