• 감성과학
• /
• 제14권2호
• /
• pp.227-234
• /
• 2011

본 연구는 정보를 숨기려는 의도가 있을 때의 뇌 가능을 알아보고자 한다. Kubo와 Nittono(2009) 그리고 Verschuere와 동료들(2009)은 P300 진폭을 이용하여 정보를 숨기려는 의도에 대한 연구를 수행하였다. 선행연구에 기초하여, 본 연구는 정보를 숨기려는 '의도'가 있를 때 뇌 기능에 어떤 변화가 나타나는지 관찰하고자 하여 19명의 남자 대학생을 대상으로 실험을 수행하였다. 실험은 실험 참가자 본인의 이름을 숨긴정보로 하여 숨기려는 의도가 있는 조건과 숨기려는 의도가 없는 조건에서 수행하였다. 실험 결과, 숨기려는 의도가 있는 조건에서 숨기려는 의도가 없는 조건에 비해 전측대상이랑(Rt. ACC)과, 좌측 안와전전두피질(Lt. OFC)에서 더 큰 활성화가 관찰되었다. ACC는 선행 fMRI 연구에서 거짓말에 특정적인 처리가 이루어지는 영역으로 알려져 있는 영역이다. OFC는 불안, 공포, 및 죄책감과 같은 정서반응과 관련이 있는 것으로 알려진 영역이다. 숨기려는 의도가 있는 조건에서는 거짓말이 탄로 날지도 모른다는 생각 때문에 불안 반응이 나타나게 되고, 이는 OFC의 활성화와 연관이 있는 것으로 볼 수 있다.

• 한국수소및신에너지학회논문집
• /
• 제24권1호
• /
• pp.91-97
• /
• 2013

Recently a novel cycle named organic flash cycle (OFC) has been proposed which has improved potential for power generation from low-temperature heat sources. This study carries out thermodynamic performance analysis of OFC using various working fluids for recovery of low-grade heat sources in the form of sensible energy. Special attention is focused on the optimum flash temperature at which the exergy efficiency has the maximum value. Under the optimal conditions with respect to the flash temperature, the thermodynamic performances of important system variables including mass flow ratio, separation ratio, heat addition, specific volume flow rate at turbine exit, and exergy efficiency are thoroughly investigated. Results show that the exergy efficiency has a peak value with respect to the flash temperature and the optimum working fluid which shows the best exergy efficiency varies with the operating conditions.

• 대한두개안면성형외과학회지
• /
• 제25권1호
• /
• pp.11-16
• /
• 2024

Background: The pathogenesis of orofacial cleft (OFC) is multifactorial, involving both genetic and non-genetic factors, the latter of which play a key role in the development of these anomalies. This paper addresses the incidence of OFC in Indonesia, with a focus on identifying and examining the distribution of contributory factors, including parental medical history, pregnancy history, and environmental influences. Methods: The study was conducted through the collection of primary data. An interdisciplinary research team from Indonesia administered a standardized questionnaire to parents who had children with OFC and who had provided informed consent. The case group comprised 133 children born with cleft lip and/or palate, and the control was 133 noncleft children born full-term. The risk factors associated with OFC anomalies were analyzed using the chi-square test and logistic regression. All statistical analyses were performed using SPSS version 25. A p-value of 0.05 or less was considered to indicate statistical significance. Results: The study comprised 138 children, of whom 82 were boys (59.4%) and 56 were girls (40.6%). Among them, 45 patients (32.6%) presented with both cleft lip and cleft palate, 25 individuals (18.1%) had a cleft palate only, and 28 patients (20.3%) had a cleft lip only. OFC was found to be significantly associated with a maternal family history of congenital birth defects (p<0.05), complications during the first trimester (p<0.05), consumption of local fish (p<0.05), caffeine intake (p<0.05), prolonged medication use (p<0.05), immunization history (p<0.05), passive smoking (p<0.05), and X-ray exposure during pregnancy (p<0.05). Conclusion: The findings indicate close relationships between the incidence of OFC and maternal medical history, prenatal factors, and environmental influences.

• 광산업정보
• /
• 통권4호
• /
• pp.48-51
• /
• 2001

• 광산업정보
• /
• 통권4호
• /
• pp.19-21
• /
• 2001

• 광산업정보
• /
• 통권45호
• /
• pp.10-13
• /
• 2008

• 광학과기술
• /
• 제2권2호
• /
• pp.76-76
• /
• 1998

• 광산업정보
• /
• 통권10호
• /
• pp.42-45
• /
• 2002

• 광산업정보
• /
• 통권16호
• /
• pp.54-57
• /
• 2003

• 한국군사과학기술학회지
• /
• 제22권4호
• /
• pp.492-500
• /
• 2019

Equal channel angular pressing(ECAP) is a severe plastic deformation technique capable of introducing large shear strain in bulk metal materials. However, if an ECAPed material has an inhomogeneous microstructure and anisotropic mechanical properties, this material is difficult to apply as structural components subjected to multi-axial stress during use. In this study, extruded oxygen-free copper(OFC) rods with a large diameter of 42 mm are extruded through ECAP by route Bc up to 12 passes. The variations in the microstructure, hardness, tensile properties, and microstructural and mechanical homogeneity of the ECAPed samples are systematically analyzed. High-strength OFC rods with a homogeneous and equiaxed-ultrafine grain structure are obtained by the repeated application of ECAP up to 8 and 12 passes. ECAPed samples with 4 and 8 passes exhibit much smaller differences in terms of the average grain sizes on the cross-sectional area and the tensile strengths along the axial and circumferential directions, as compared to the samples with 1 and 2 passes. Therefore, it is considered that the OFC materials, which are fabricated via the ECAP process with pass numbers of a multiple of 4, are suitable to be applied as high-strength structural parts used under multi-axial stress conditions.