Kenji Sugiki

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In recent years, electronic markets are increasing rapidly and attracting the attention of customers. In these sites, people search for products using retrieval systems. They, however, often cannot translate their subjective needs into keyword-based queries or adapt to the interfaces. In this paper, we describe a product retrieval system robust to(More)
We introduce a subway information system which utilize WiFi location technology for supporting a person in the underground. The system is composed of a mobile terminal with a WiFi device and a communication server. We have developed seven location aware applications for the mobile terminal. Each of the application helps the user with current location(More)
Several studies have reported the asynchronous closure of normal bileaflet valves (NBVs), resulting in a split in its closing sound; however, the clinical significance of this split has never been studied in malfunctioning bileaflet valves (MBVs). The study comprised 218 valves in 184 patients, including normal monoleaflet valves (n = 10), NBVs (n = 198),(More)
A 44-year-old man, unaffected by Marfan's syndrome, had previously undergone thoracoabdominal replacement for a chronic, type B dissecting aneurysm. Reconstruction of the visceral arteries was performed using an island technique. However, approximately 3 years after the operation, the reconstructed part of the aorta containing the visceral arteries became(More)
The wavelet analytical system developed in our institute can detect a malfunctioning bileaflet valve by analyzing the split interval (SI) of bileaflet valve sound (BLVS) caused by asynchronous closure of both leaflets. However, this system is limited in its clinical application because of the complications of both valve sound recording and analytical(More)
OBJECTIVE The Heartstring is one of the devices that enable proximal anastomosis without clamping the aorta. We have applied the device not only to low-risk patients with normal aortas but also to high-risk patients with diseased aortas. The purpose of this study was to investigate the initial outcomes of using this device. METHODS The Heartstring was(More)
We report a case of cardiac myxoma of the aortic valve. To our knowledge, this represents only the seventh such case ever documented. A 61-year-old woman underwent an echocardiography to screen for hypertensive–diabetic cardiac complications, which showed a mass on her aortic valve. Although she had not experienced a fever, the mass closely resembled a(More)
We previously reported our development of a wavelet analysis system which demonstrates that in vivo bileaflet mechanical valve sound splits into two spikes at higher frequency levels and, based on this system, proposed criteria for detecting malfunctioning bileaflet valves (MBVs). However, the results of that study were only tentative due to the small(More)
In this paper, we propose a product retrieval method using product reviews. The method calculates the score of a product based on the similarity between a user’s request extracted from a natural language query and consumers’ opinions extracted from reviews of the product. We also propose the method to generate the thesaurus automatically from consumers’(More)
A 36-year-old man suffering from exertional dyspnea was admitted to our hospital. An echocardiogram showed a left atrial tumor, which was excised via the left atrial approach. Histological examination of the surgical specimen revealed that it was a myxosarcoma. Twelve months after the surgery, the tumor recurred in the left atrium, and metastatic tumors(More)