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Biomedical subjects

Kenji Nomura

Publications and source records attributed to Kenji Nomura.

5 recordsLinked to original sources
PubMed2004

Room-temperature fabrication of transparent flexible thin-film transistors using amorphous oxide semiconductors.

Transparent electronic devices formed on flexible substrates are expected to meet emerging technological demands where silicon-based electronics cannot provide a solution. Examples of active flexible applications include paper displays and wearable computers. So far, mainly flexible devices based on hydrogenated amorphous silicon (a-Si:H) and organic semiconductors have been investigated. However, the performance of these devices has been insufficient for use as transistors in practical computers and current-driven organic light-emitting diode displays. Fabricating high-performance devices is challenging, owing to a trade-off between processing temperature and device performance. Here, we propose to solve this problem by using a novel semiconducting material--namely, a transparent amorphous oxide semiconductor from the In-Ga-Zn-O system (a-IGZO)--for the active channel in transparent thin-film transistors (TTFTs). The a-IGZO is deposited on polyethylene terephthalate at room temperature and exhibits Hall effect mobilities exceeding 10 cm2 V(-1) s(-1), which is an order of magnitude larger than for hydrogenated amorphous silicon. TTFTs fabricated on polyethylene terephthalate sheets exhibit saturation mobilities of 6-9 cm2 V(-1) s(-1), and device characteristics are stable during repetitive bending of the TTFT sheet.

Journal Article↗
PubMed2004

[Support for the family from infancy].

A rising tendency has been reported for child abuse in our country in recent years, and the need to provide support for child-care capabilities in the home has been raised. In this context, attention has turned to the mother-child relationship and the mother's mental health from early on, in pregnancy and the antenatal period. In particular, it has become clear that the incidence of post-partum maternity blues and puerperal depression is higher than hitherto believed, drawing focus upon the effects of the mother's depression on the mother-child relationship. This report outlines the research and clinical intervention we have been undertaking for the mother's depression in pregnancy and the puerperium in relation to maternal attachment. 1) Results from studies in the puerperium on a group of mothers with children admitted to the NICU and a control group of mothers, and a 1-year follow-up study on the control group of mothers have revealed a relationship between a mother's depression and maternal attachment in the puerperium with depression and maternal attachment after 1 year, indicating the importance of focusing on the mother's depression and maternal attachment from the puerperium in thinking about maternal mental health and the mother-child relationship. 2) We have been attempting clinical intervention for the mother's psychological problems through the obstetric clinic, obstetric ward, and NICU, since 1998. The number of subjects, interviews, interview content, and other such data are reported. 3) A borderline personality disorder case we have been involved with clinically from age 19 is presented, for discussion of problems arising in the mother-child relationship from pregnancy through the child-rearing years.

Adult↗
PubMed2003

Antenatal depression and maternal-fetal attachment.

BACKGROUND: In recent years, attention has been turned to maternal mental health in relation to the mother-child relationship accompanying a widening in focus, i.e. taking into account not only the puerperium, but also the stage of pregnancy. This applies to studies that have revealed a connection between depression and maternal attachment in the postpartum period and late pregnancy. This study, however, was designed to evaluate the maternal-fetal relationship in the first and second trimesters, being the first one to address this issue in these early stages. SAMPLING AND METHODS: Zung's Self-Rating Depression Scale (ZSDS), the original Antenatal Maternal Attachment Scale (AMAS), and a questionnaire addressing peripheral factors were given to 216 pregnant women (3-6 months of gestation) who visited the Nagoya University Hospital between September 1998 and June 2001. RESULTS: Contrary to reports on the latter stages of pregnancy, no direct association was observed between depression in mothers and maternal-fetal attachment before fetal movement was perceived. CONCLUSION: However, education, form of employment, planning of pregnancy, and premenstrual mood changes were found to be associated with the ZSDS score (mean: 41.9), while form of employment, feelings regarding pregnancy, and sources of support were extracted as factors associated with the AMAS, which are of interest in terms of the subsequent association between depression and maternal-fetal attachment in the peri- and postnatal periods.

Adult↗
PubMed2003

Thin-film transistor fabricated in single-crystalline transparent oxide semiconductor.

We report the fabrication of transparent field-effect transistors using a single-crystalline thin-film transparent oxide semiconductor, InGaO3(ZnO)5, as an electron channel and amorphous hafnium oxide as a gate insulator. The device exhibits an on-to-off current ratio of approximately 106 and a field-effect mobility of approximately 80 square centimeters per volt per second at room temperature, with operation insensitive to visible light irradiation. The result provides a step toward the realization of transparent electronics for next-generation optoelectronics.

Journal Article↗