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The High Temperature Oxidation Behavior of Diffusion Aluminized MarM247 Superalloy
Matsunaga, Yasuo,Matsuoka, Akira,Nakagawa, Kiyokazu 한국부식방식학회 2003 Corrosion Science and Technology Vol.2 No.1
The MarM247 based superalloy (8wt.%Cr- 9wt.%Co- 3wt.%Ta- 1.5wt.%Hf- 5.6%wt.Al- 9.5wt.%W- Bal.Ni) specimens were diffusion aluminized by for types of pack cementation methods, and their coating structure and their high temperature oxidation resistance were investigated. The coated specimens treated at 973K in high aluminum concentration pack had a coating layer containing large hafunium rich precipitates, which were originally included in substrate alloy. After the high temperature oxidation test in air containing 30 vol.% H₂O at 1273K - 323K, the deep localized corrosion which reached to the substrate were observed along with these hafnium rich precipitates. On the other hand, the coated specimens treated at 1323K using low aluminum concentration pack showed the coating layer without the large hafunium rich precipitates, and after the high temperature oxidation test at 1273K for 1800 ksec, it did not show the deep localized corrosion. The nickel electroplating before the aluminizing forms thick hahium free area, and its high temperature oxidation resistance were comparable to platinum modified aluminizing coatings at 1273K.
Gastric Adenocarcinoma with Thymic Metastasis after Curative Resection: A Case Report
Matsunaga, Tomoyuki,Saito, Hiroaki,Miyatani, Kozo,Takaya, Seigo,Fukumoto, Yoji,Osaki, Tomohiro,Ikeguchi, Masahide The Korean Gastric Cancer Association 2014 Journal of gastric cancer Vol.14 No.3
The peritoneum is the most frequent site of recurrence for gastric cancer after gastrectomy, followed by the liver and lymph nodes. In contrast, metastasis to the thymus is rare. Annual surveillance with computed tomography was performed on a 67-year-old man who previously underwent a distal gastrectomy and D2 lymph node dissection for gastric cancer at Tottori University. Five years after the initial operation, an anterior mediastinal tumor was detected by computed tomography. The patient underwent video-assisted thoracic surgery to remove the tumor. Histopathology revealed adenocarcinoma cells similar to those of the gastric cancer resected 5 years previously. Thymic metastasis was considered likely based on the location of the tumor. The recognition that gastric cancer can metastasize to unusual anatomic locations, such as the thymus, can facilitate an accurate, prompt diagnosis and appropriate treatment.
An ILMI Approach to Guaranteed Cost Controllers with a Minimal Order Observer
Daisuke Matsunaga,Mitsuaki Ishitobi,Sadaaki Kunimatsu 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper presents a design scheme of a minimal order observer-based guaranteed cost controller for uncertain linear systems, in which some state variables cannot be measured. The perturtations are assumed to be described by structural uncertainties. An iterative linear matrix inequality(ILMI) approach is used to design the observer_based controller. A numerical example is given to illustrate the proposed method.