Current Status and Future Trends of Asian Pear Production and Research in Japan

Akihiro Itai 한국원예학회 2006 한국원예학회 기타간행물 Vol.- No.-

카리브호수 카펜타 자원량 추정을 위한 최대엔트피모델과 분석적 모델의 비교분석

이타이 텐다우펜유 ( Itai Hilary Tendaupenyu ),표희동 ( Hee-Dong Pyo ) 한국환경경제학회·한국자원경제학회(구 한국환경경제학회) 2017 자원·환경경제연구 Vol.26 No.4

카리브호수의 카펜타 자원량을 추정하기 위해 최대엔트로피(ME)모델과 분석적 모델이 적용된다. ME모델을 이용하여 25,372톤의 최대지속가능 어획량(MSY)과 MSY의 어획노력량인 109,731의 어획일수(fishing nights)를 추정하였는데, 이는 현재 어획노력량 수준이 과잉투자됨으로써 1988년 이후 2009년 현재까지 자원량을 감소시키는 요인인 것을 나타낸다. 분석적 모델은 매년의 생물학적 허용 어획량(ABC)과 연간 1.21의 어획사망계수(일반적 어획사망계수인 0.927 보다 큰)를 추정한다. 이 두 모델은 1982년 기준년도의 자원량 추정에 적용할 수 있는 유사한 자원량을 추정한다. ME모델에 의하면 1988년의 최대 자원량(156,047톤)에 대해 1/3수준이하 까지 점점 하락하는 결과를 추정하였는데, 이는 최근의 어획량이 MSY 수준 이하이지만 ABC수준보다 높게 나타나 남획된 것을 암시한다. 다시 말해서, 분석적 모델은 ME모델에서의 MSY보다 더 보수적인 ABC를 제공함으로써, 보수적인 어업관리정책(총허용어획량제도, 어획노력감소정책 등)을 적극적으로 고려해야함을 내포하고 있다. A Maximum Entropy (ME) Model and an Analytical Model are analyzed in assessing Kapenta stock in Lake Kariba. The ME model estimates a Maximum Sustainable Yield (MSY) of 25,372 tons and a corresponding effort of 109,731 fishing nights suggesting overcapacity in the lake at current effort level. The model estimates a declining stock from 1988 to 2009. The Analytical Model estimates an Acceptable Biological Catch (ABC) annually and a corresponding fishing mortality (F) of 1.210/year which is higher than the prevailing fishing mortality of 0.927/year. The ME and Analytical Models estimate a similar biomass in the reference year 1982 confirming that both models are applicable to the stock. The ME model estimates annual biomass which has been gradually declining until less than one third of maximum biomass (156,047 tons) in 1988. It implies that the stock has been overexploited due to yieldings over the level of ABC compared to variations in annual catch, even if the recent prevailing catch levels were not up to the level of MSY. In comparison, the Analytical Model provides a more conservative value of ABC compared to the MSY value estimated by the ME model. Conservative management policies should be taken to reduce the aggregate amount of annual catch employing the total allowable catch system and effort reduction program.

Hubbard Physics in the Symmetric Half-filled Periodic Anderson-Hubbard Model

I. Hagym´asi,K. Itai,J. S´olyom 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.10

Two very different methods – exact diagonalization on finite chains and a variational method –are used to study the possibility of a metal-insulator transition in the symmetric half-filled periodic Anderson-Hubbard model. With this aim we calculate the density of doubly occupied d sites (νd)as a function of various parameters. In the absence of on-site Coulomb interaction (Uf ) between f electrons, the two methods yield similar results. The double occupancy of d levels remains always finite just as in the one-dimensional Hubbard model. Exact diagonalization on finite chains gives the same result for finite Uf , while the Gutzwiller method leads to a Brinkman-Rice transition at a critical value (Uc d ), which depends on Uf and V .

Iron deficiency regulated OsOPT7 is essential for iron homeostasis in rice

Bashir, Khurram,Ishimaru, Yasuhiro,Itai, Reiko Nakanishi,Senoura, Takeshi,Takahashi, Michiko,An, Gynheung,Oikawa, Takaya,Ueda, Minoru,Sato, Aiko,Uozumi, Nobuyuki,Nakanishi, Hiromi,Nishizawa, Naoko K. Springer-Verlag 2015 Plant Molecular Biology Vol. No.

Party relevance and party survival in new democracies

William Bianco,Christopher Kam,Itai Sened,Regina Smyth 한국외국어대학교 국제지역연구센터 2014 International Area Studies Review Vol.17 No.3

We argue that the move to free and fair elections is only the first step in a democratic transition. With this change, competition moves into the legislative arena, where interests are defined not in terms of support or opposition to the old regime, but over competing visions of what government should do. Thus, examining legislative behavior and legislative outcomes helps us to understand the long-term political and policy trajectory of democratic transitions. Building on game-theoretic analysis of majority-rule decision-making, our hypothesis is that, after controlling for factors such as seat share, party survival depends on party relevance—the organization’s influence over legislative outcomes. Using legislative roll call data from Hungary, Poland, Russia and Ukraine, we show that relevance is a major influence on party survival, even after controlling for seat shares and other factors. The last section of the paper discusses the implications of these results for democracy assistance programs.

COVID-19 Risk Factors Among Health Workers: A Rapid Review

Mhango, Malizgani,Dzobo, Mathias,Chitungo, Itai,Dzinamarira, Tafadzwa Occupational Safety and Health Research Institute 2020 Safety and health at work Vol.11 No.3

Coronavirus disease 2019 (Covid-19) poses an important occupational health risk to health workers (HWs) that has attracted global scrutiny. To date, several thousand HWs globally have been reported as infected with the severe acute respiratory syndrome coronavirus 2 virus that causes the disease. It is therefore a public health priority for policymakers to understand risk factors for this vulnerable group to avert occupational transmission. A rapid review was carried out on 20 April 2020 on Covid-19 risk factors among HWs in PubMed, Google Scholar, and EBSCOHost Web (Academic Search Complete, CINAHL Complete, MEDLINE with Full Text, CINAHL with Full Text, APA PsycInfo, Health Source-Consumer Edition, Health Source: Nursing/Academic Edition) and WHO Global Database. We also searched for preprints on the medRxiv database. We searched for reports, reviews, and primary observational studies (case control, case cross-over, cross-sectional, and cohort). The review included studies conducted among HWs with Covid-19 that reported risk factors irrespective of their sample size. Eleven studies met the inclusion criteria. Lack of personal protective equipment, exposure to infected patients, work overload, poor infection control, and preexisting medical conditions were identified as risk factors for Covid-19 among HWs. In the context of Covid-19, HWs face an unprecedented occupational risk of morbidity and mortality. There is need for rapid development of sustainable measures that protect HWs from the pandemic.

Detection of blood vessels on CTA images of the legs

Keita Kozono,Akiyoshi Yamamoto,Yoshinori Itai,Hyoungseop Kim,Joo Kooi Tan,Seiji Ishikawa 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10

The disease that causes the obstruction of blood flow by arteriosclerosis and thickening of the arteries in the legs is called arteriosclerosis obliterans (ASO). The early detection and treatment of ASO is very important issue in the medical field. Recently, by using computer aided diagnosis (CAD), physicians can easily detect the blood vessel on the image and displaying the results by use of the system. One of the techniques for analyzing the blood vessels widely used in medical imaging is computed tomography angiography (CTA). The CTA uses three dimensional (3-D) imaging technologies. It also produces a clear image of main blood vessels throughout the body by using contrast media. The 3-D blood vessel image is made the volume data obtained by the CTA. By using 3-D image, we can observe the image from multi aspect. And also, it leads to the improvement of the diagnosis accuracy. In order to diagnose a symptom of the ASO, we propose a method for visual screening technique by detecting blood vessel area on the images. In this paper, we have developed a technique for separation of bone region and blood vessel area in order to extract blood vessels from a CTA volume image. The proposed technique was applied to two real CTA cases and satisfactory results for segmentation of the blood vessels were obtained. Some experimental results are shown with discussions.

오수암거 개축 및 갱신을 위한 기본계획 수립 사례

( Shogo Tanaka ),( Shunsuke Kitano ),( Hidakazu Itai ),( Satoru Shibuya ),( Jin-suk Hur ) 한국구조물진단유지관리공학회 2017 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.21 No.1

OSYNOPSIS 하수도 서비스의 보급과 더불어 하수관로나 처리장 등의 스톡도 확대되고,이와 함께 시설의 노화도 진행되고 있다. 이에 따라 유지관리에 필요한 비용도 매년 증가하고 관로의 노후화에 따른 도로함몰 등의 위험도 높아지고 있는 실정이다. 이러한 배경을 바탕으로 일본은 2008 년도에 하수도 장수명화 지원제도가 창설되어 2013 년도 이후는 공적자금 교부대상 사업으로 개축(갱신,장수명화 대책)을 실시하는 경우에는,장수명화 계획을 따르도록 제한하고 있다. 따라서 향후 노후화한 시설을 개축하여 건전한 상태로 지속적으로 사용하기 위해서는 장수명화 계획 수립이 필수적이다. 이러한 장수명화 계획에서는 손상 열화가 확인된 관로에 대한 대책(개축, 수선)과 계획기간내의 년도별 사업량을 명시하도록 하고 있다. 한편,각 지방자치단체의 재정상황은 앞으로 더욱 어려워질 것으로 예상되어 한정된 자원으로 효과적인 유지관리 사업을 실시하기 위해서는 시설의 노화도,중요도 및 투자의 평준화 등을 고려한 개축갱신의 우선순위 결정이나 사업계획 스케쥴 수립이 무엇보다 중요하다. 본 논문에서는 하수도 관로를 대상으로 한 장수명화 계획에 따른 우선순위 검토 사례를 소개하고자 한다.

Ultrasensitive and Highly Selective Gas Sensors Based on Electrospun SnO₂ Nanofibers Modified by Pd Loading

Yang, Dae‐,Jin,Kamienchick, Itai,Youn, Doo Young,Rothschild, Avner,Kim, Il‐,Doo WILEY‐VCH Verlag 2010 Advanced functional materials Vol.20 No.24

<P><B>Abstract</B></P><P>This work presents a new route to suppress grain growth and tune the sensitivity and selectivity of nanocrystalline SnO<SUB>2</SUB> fibers. Unloaded and Pd‐loaded SnO<SUB>2</SUB> nanofiber mats are synthesized by electrospinning followed by hot‐pressing at 80 °C and calcination at 450 or 600 °C. The chemical composition and microstructure evolution as a function of Pd‐loading and calcination temperature are examined using EDS, XPS, XRD, SEM, and HRTEM. Highly porous fibrillar morphology with nanocrystalline fibers comprising SnO<SUB>2</SUB> crystallites decorated with tiny PdO crystallites is observed. The grain size of the SnO<SUB>2</SUB> crystallites in the layers that are calcined at 600 °C decreases with increasing Pd concentration from about 15 nm in the unloaded specimen to about 7 nm in the 40 mol% Pd‐loaded specimen, indicating that Pd‐loading could effectively suppress the SnO<SUB>2</SUB> grain growth during the calcination step. The Pd‐loaded SnO<SUB>2</SUB> sensors have 4 orders of magnitude higher resistivity and exhibit significantly enhanced sensitivity to H<SUB>2</SUB> and lower sensitivity to NO<SUB>2</SUB> compared to their unloaded counterparts. These observations are attributed to enhanced electron depletion at the surface of the PdO‐decorated SnO<SUB>2</SUB> crystallites and catalytic effect of PdO in promoting the oxidation of H<SUB>2</SUB> into H<SUB>2</SUB>O. These phenomena appear to have a much larger effect on the sensitivity of the Pd‐loaded sensors than the reduction in grain size.</P>

Proximity Connection in Two-Dimensional Signal Transmission

Naoshi Yamahira,Yastoshi Makino,Hiroto Itai,Hiroyuki Shinoda 제어로봇시스템학회 2006 제어로봇시스템학회 국제학술대회 논문집 Vol.2006 No.10