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Hiroshi HAYAMA,Nobukazu HOSHI 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
Auxiliary resonant snubber inverters (RSIs) have been proposed as a solution of demands for inverter, which are high efficiency and low EMI. In RSI, zero voltage switching (ZVS) on the inverter main switches is achieved by use of the auxiliary circuit; however, additional conduction loss increases simultaneously. The operating frequency of the auxiliary circuit in RSI can be reduced to a half of switching transition of a main switch when lossless snubber commutation, in which ZVS can be achieved without using auxiliary circuit by using output current, is used. As a result, additional conduction loss can be suppressed. However, in this scheme, ZVS turn-on on main switch is failed near zero output current when dead-time was constant. As a solution for this problem, adjustable dead-time control scheme for RSI has been proposed. Adjustable dead-time control has not been applied to a rectifier with auxiliary resonant snubber circuit ?auxiliary resonant snubber rectifier (RSR)in the previous work. Thus, adjustable dead-time control is applied to RSR in this paper. This paper shows a control scheme for RSR. Moreover, the effectiveness of adjustable dead-time control by comparing between the adjustable and the fixed dead-time control is described.
K-POP 아이돌그룹에 일본인 멤버가 있음의 의의 -소속사의 전략, 그룹내 문화교류, 일본인 팬들의 수용을 중심으로-
하야마신스테 ( Hayama Shinsuke ) 한국다문화 디아스포라학회 2019 다문화와 디아스포라연구 Vol.14 No.-
본고에서는 K-POP 아이돌그룹에 일본인 멤버가 있음의 의의에 대하여 ‘소속사의 전략’, ‘그룹내 문화교류’, ‘일본인 팬들의 수용’이라는 세 가지 관점으로 고찰했다. 그 결과, 소속사는 그룹을 다국적화 시킴으로서 해외에서 인기를 얻으려고 하는데, 특히 일본에 있어서는 일본 기업과 제휴하거나 일본어로 정보발신하는 등 적극적인 프로모션을 하고 있다고 확인되었다. K-POP 아이돌그룹에 속하는 일본인 멤버는 한국 문화에 동화한 경우가 많지만, 그 그룹이 일본에서 활동하는 때에는 다른 멤버를 도와주는 장면이 보이었다. 또 일본 방문을 통하여 한국인 멤버는 외국인 멤버의 마음이 이해되는 외에 그 가족들과의 사이에는 ‘이문화를 가지면서 친한 사람’ 끼리의 교류가 생기고, 서로의 문화 이해로 이어져 있었다. 게다가 일본인 멤버는 K-POP과 일본인 팬들의 다리를 놓는 역할도 한다. 라이브 방송 때 방송 내용이나 한국 문화를 설명하는 사례가 가끔 있었다. V LIVE 구독자수를 보아도 이런 활동이나 일본인 멤버가 존재함이 일본인 팬 획득·정착으로 이어지는 것이 밝혀졌다. 이렇게 해서 K-POP에 접근한 일본인들이 최근 일본인 멤버가 없는 그룹에도 관심을 가지게 되는 것도 주목되는 현상이다. This paper discussed what Japanese members of K-POP idol groups bring to them from three perspectives: strategies of agencies, cultural exchange within groups, and acceptance of Japanese fans. We found that agencies aim to make the groups popular abroad by making it multinational. Especially in Japan, they are actively promoting the groups by cooperating with Japanese companies or sending information in Japanese. Japanese members often assimilate into Korean culture. However, when the groups visit Japan, they help other members act in Japan. Korean members understand how foreign members feel by being in a foreign country. In addition, families of Japanese members interact other members as ‘friendly people with a different culture’, and it leads to understanding of each other's culture. Japanese members also play the role as a bridge between K-POP and Japanese fans. Japanese members sometimes explain the broadcasting contents and Korean culture for Japanese fans during live broadcasting. The number of V LIVE subscribers reveals that these activities or the presence of Japanese members leads to the acquisition and settlement of Japanese fans. It is also remarkable that the Japanese who have approached K-POP in this way become interested in groups that have no Japanese members these days.
Ogura, Ichiro,Hayama, Kazuhide,Sue, Mikiko,Oda, Takaaki,Sasaki, Yoshihiko Korean Academy of Oral and Maxillofacial Radiology 2017 Imaging Science in Dentistry Vol.47 No.4
Purpose: Sialolithiasis is one of the most prevalent large obstructive disorders of the submandibular glands. The aim of this study was to investigate submandibular sialolithiasis with computed tomography (CT) and scintigraphy, with a particular focus on the relationship between CT values of the submandibular glands and their excretion rate. Materials and Methods: Fifteen patients with submandibular sialolithiasis who underwent CT and salivary gland scintigraphy were included in this study. The relationship between the CT values of submandibular glands with and without sialoliths and salivary gland excretion measured using salivary gland scintigraphy was statistically analyzed. Dynamic images were recorded on the computer at 1 frame per 20 seconds. The salivary gland excretion fraction was defined as A (before stimulation test [counts/frame]) / B (after stimulation test [counts/frame]) using time-activity curves. Results: The CT values in the submandibular glands with and without sialoliths was $9.9{\pm}44.9$ Hounsfield units(HU) and $34.2{\pm}21.8HU$, respectively (P=.233). Regarding the salivary gland excretion fraction using scintigraphy, the A/B value in the submandibular glands with sialoliths ($1.09{\pm}0.23$) was significantly lower than in the submandibular glands without sialoliths($1.99{\pm}0.57$, P=.000). Conclusion: Assessments of the CT values and the salivary gland excretion fraction using scintigraphy in the submandibular glands seem to be useful tools evaluating submandibular sialolithiasis.
Ryo Ohmura,Hiroaki Hayama,Hotaka Akiba,Yuki Asami 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.6
This study reports a visual observation of the formation and growth of ionic semiclathrate hydrate on the surface of a Tetrabutylammonium bromide (TBAB) aqueous solution and CO2+N2 gas mixture. The composition of CO2+N2 gas mixture was 20 : 80. The experimental temperature range was from 280 K to 290 K, under the pressures of 2.3MPa and 4.7MPa, at wTBAB=0.10 and wTBAB=0.40, where wTBAB denotes the mass fraction of TBAB in the aqueous solution. At wTBAB=0.40, the hydrate crystals were initially observed to grow within the droplet, and followed by lateral growth at the droplet surface; but at wTBAB=0.10, the hydrate crystals grew exclusively in the liquid phase and did not cover the droplet surface. Two types of different crystals with different sizes were clearly observed.
Maritime Casualties Occurred Onboard Ships Registered under the Central American Region Flag States
Oscar Porras Rojas,Hayama Imazu,Takahiko Fujisaka 한국항해항만학회 2006 한국항해항만학회 학술대회논문집 Vol.1 No.-
This research is based on the information compiled on the occurrence of maritime casualties onboard ships registered under Central American Region (CAR) flag States. Due to nonexistence of writing reports in anyone of the countries that are integrating this Region, the information was compiled by the author through personal communication with the people involved in the casualties. The information was compiled by typing up the text and digitizing on the computer for the respective data base. For each casualty occurred, the following information was compiled, date and type of the casualty, position of the ship at the time of the casualty, dimension of the ship, number of people affected by the casualty, and cause and consequences of the casualty. Based on the number of people affected (death and disappear) by the casualties occurred was calculated the mortality rate by 100,000 persons and then compared with the Japanese mortality rate. Furthermore were analyzed the CAR maritime authorities competences and then were compared to that the Japanese counter part. In addition, the implementation rate of the International Maritime Organization (IMO) and International Labor Organization (ILO) conventions ratified by the CAR countries were analyzed. The objective of this research was to compiled and analyze the occurrences of maritime casualties happened on board the ships registered under the CAR Flag States, in order to determine the causes of these accidents. The results of the analysis enable us to better understand of the maritime safety situation of the ships that are registered under the CAR flag States. In order to reduce the occurrence of maritime casualties are proposed a series of measures based on the differences found then the comparison between CAR and Japan. Based on the results of this research, is possible to conclude that the inaccessibility of atmospheric information and the lack of safety measures onboard has been the main cause of the maritime casualties happened in the Pacific side of the CAR.