건식 열화처리가 FRP 의 표면 열화와 유전특성에 미치는 영향

이덕출,이백수,정의남,유도현,김종택 한국산업안전학회 1998 한국안전학회지 Vol.13 No.3

In this paper, we investigated the change of wettability, surface potential decay and dielectric properties caused by ultraviolet-treated, thermal-treated and discharge-treated FRP(fiber reinforced plastics) respectively for finding out: the influence of dry treatments effected to electrical characteristics on the surface of polymer composites. For the change of wettability, the contact angle of thermal-treated specimen with the high temperature of 200℃ increased. But that of UV-treated and discharge- treated specimen decreased. The characteristic of surface potential decay shows the tendency of the remarkable decrease on UV-treated and discharge-treated specimens, but no difference on thermal-treated specimen compared with untreated one. Also, for the dielectric properties, it shows the increase at large on the treated specimens and especially, the remarkable increase on thermal-treated one.

Hole 의 Nonrandomness 를 고려한 격자 모델

유성식,이철수 고려대학교 공학기술연구소 1990 고려대학교 생산기술연구소 생기연논문집 Vol.26 No.1

Okada and Nose applied the quasichemical approximation proposed by Guggenheim to the hole theory with fixed cell volume, but they did not obtain closed form expressions. ft was the objective of this work to establish an EOS and related thermodynamic quantities for mixtures by expanding, the Helmholtz energy by Taylor series in the energy parameter. This model was applied to pure supercritical solvent widely used, and calculated PVT behavior was in good agreement with data.

CBD(Chemical Bath Deposition) 방법에 의한 ZAnSe 박막성장과 광전기적 특성

홍광준,유상하 한국센서학회 2001 센서학회지 Vol.10 No.1

The ZnSe sample grown by chemical bath deposition (CBD) method were annealed in Ar gas at 450 C. Using extrapolation method of X-ray diffraction pattern, it was found to have zinc blend structure whose lattice parameter a, was 5.6687 Å. From Hall effect, the mobility was likely to be decreased by impurity scattering at temperature range from 10 K to 150 K and by lattice scattering at temperature range from 150 K to 293K. The band gap given by the transmission edge changed from 2.7005 eV at 293 K to 2.8739 eV at 10 K. Comparing photocurrent peak position with transmission edge, we could find that photocurrent peaks due to excition electrons from valence band, Γ_8 and Γ_7 to conduction band Γ_6 were observed at photocurrent spectrum. From the photocurrent spectra by illumination of polarized light on the ZnSe thin film, we have found that values of spin orbit coupling splitting Δ so is 0.098 eV. From the PL spectra at 10 K, the peaks con-esponding to free hound excitons and D-A pair and a broad emission band due to SA is identified. The binding energy of the free excitons are determined to be 0.0612 eV and the dissipation energy of the donor -bound exciton and acceptor-bound exciton to be 0.0172 eV, 0.0310 eV, respectively.

스테인리스강의 질화

김한군,정병호,유용주 한국열처리공학회 2001 熱處理工學會誌 Vol.14 No.6

경인지역 군수품 제조업체의 안전관리실태와 대책에 관한 연구

김용수,태순호,유삼인 한국산업안전학회 1999 한국안전학회지 Vol.14 No.3

Our government has been continuously making an effort to improve safety management and prevent accidents in small-to-medium sized enterprises, but the accidents are still happening. Since there hasn't been a study on the actual state of safety management for the munitions manufacturing industry so far, this paper aims to investigate and analyze the actual state of the munitions manufacturing companies in Kyung-In area and it also shows the countermeasures of improvement.

군부대 병사들의 자아상태와 인생태도가 군 복무 적응에 미치는 영향

김영호(Young Ho, Kim),문유정(You Jeong, Moon) 한국교류분석상담학회 2021 교류분석상담연구 Vol.11 No.2

본 연구의 목적은 현역 군 장병들의 자아상태와 인생태도 특성을 파악하고 군 복무 적응에 대한 자아상태와 인생태도의 영향력을 밝혀내는 것이다. 연구목적을 달성하기 위해 군부대 육군병사 307명을 대상으로 자료를 수집하였다. 그리고 SPSS 18.0을 활용하여 기술통계 분석, 상관관계 분석, 일원배치 분산분석과 다중회귀분석을 실시하였다. 그 결과 첫째, 조사대상자의 자아상태는 NP가 정점에 있는 산 모습(Mountain Pattern)을 나타내었다. 둘째, 조사대상자의 인생태도는 자기긍정․타인긍정 유형으로 나타났다. 셋째, 4가지 인생태도 중 자기부정․타인부정 태도에 비해 자기긍정․타인긍정, 자기긍정․타인부정, 자기부정․타인긍정 태도가 군 복무 적응 수준이 높은 것으로 나타났다. 넷째, NP 자아와 타인긍정 태도는 군 복무 적응에 정(+)적 영향을 미치는 것으로 나타났다. 연구결과에 근거하여 병사들이 군 복무에 잘 적응할 수 있는 방안으로서 자기부정․타인부정 태도를 지양하고 NP 자아와 타인긍정 태도를 활성화하는 개입이 군 복무 기간 동안 필요함을 제시하였다. The purpose of this study is to identify the ego state and life position characteristics of some soldiers in a military unit and to find the effects of ego-state and life position on military service adaptation. To this end, data was collected from 307 army soldiers in a military unit. Then, descriptive statistics, correlation analysis, One-way ANOVA, and multiple linear regression analysis were performed using the SPSS 18.0 program. The research results are as follows. First, the ego state of the study participants was the Mountain Pattern, with NP as the highest point. Second, the life position of the study participants was found to be a type of ‘I’m OK․You’re OK’. Third, it was found that the level of military service adaptation of ‘I’m OK․You’re OK’, ‘I’m OK․You’re not OK’ and ‘I’m not OK․You’re OK’ was higher than that of ‘I’m not OK․You’re not OK’. Fourth, it was found that NP and ‘You’re OK’ had a positive effect on military service adaptation, respectively. Based on this study, It requires specific interventions which make soldiers avoid ‘I’m not OK․You’re not OK’ and activate both ‘NP’ and ‘You’re OK’ for their better adaptations while serving in the military.

Abnormal differentiation of regulatory T cells and Th17 cells induced by perinatal bisphenol A exposure in female offspring mice

You‑dan Dong,Liang Gao,Feng‑juan Wu,Ren Lin,Yuan Meng,Li‑hong Jia,Xiao‑fei Wang 대한독성 유전단백체 학회 2020 Molecular & cellular toxicology Vol.16 No.2

Background Bisphenol A (BPA) is an environmental estrogen widely exposed to human beings, and there are more studies on its reproductive toxicity, endocrine disruption and neurobehavioral disorders. Recent few studies have found that BPA has immunotoxicity, and its mechanism is not clear. Therefore, the effects of BPA on immune system have attracted extensive attention. The aim of this study was to investigate the effect and mechanism of perinatal exposure to BPA on regulatory T cells (Treg) and Th17 cells in female offspring mice. Methods Twenty-one pregnant C57BL/6 mice were randomly divided into three groups: a control group, low-dose BPA (0.2 μg/mL) and high-dose BPA (2.0 μg/mL) exposure group. All received BPA exposure via drinking water from gestational day 6 to the end of lactation. Female offspring were fed a normal diet and drinking water for 1 month. The percentages of Treg and Th17 cells, the levels of Foxp3 and RORγt protein and IL-17 and TGF-β from spleen tissue or blood were measured in female offspring. Results The percentage of Treg cells and levels of Foxp3 protein decreased, while the percentage of Th17 cells and levels of RORγt protein increased, which showed a dose–effect relationship. The levels of serum TGF-β were significantly lower and the levels of serum IL-17 were statistically higher in BPA-exposed female offspring compared with controls (P < 0.05 or P < 0.01). But there were no statistical difference in the levels of serum TGF-β and IL-17 between 0.2 μg/mL and 2.0 μg/ mL BPA groups (P > 0.05). Conclusion BPA exposure during pregnancy and lactation could cause abnormal differentiation and function of Treg and Th17 cells in female offspring mice, which was associated with down-regulated Foxp3 and up-regulated RORγt protein, respectively. Our findings indicated that BPA exposure during early development may play an important role in the development of autoimmune diseases later.

Preliminary analysis of geographical distribution based on cold hardiness for Evergestis extimalis (Scopoli) (Lepidoptera: Pyralidae) on Qinghai–Tibet Plateau

You‐Peng Lai,Ke Tao,Taiping Hou 한국곤충학회 2019 Entomological Research Vol.49 No.1

Evergestis extimalis (Scopoli) is a pest insect present in spring rape fields of the Qinghai–Tibet plateau. A survey of its distribution and analysis of its physiological and biochemical variances of its overwintering larvae were conducted in this study. Prior to 2006, Evergestis extimalis Scopli appeared only sporadically at the east agricultural district of Qinghai Province at 2,100 m elevation; after 2006, there have been frequent outbreaks at 2,200 m or so height. The insect's distribution has extended continuously toward higher altitudes yearly, and the scope of its damage reached 2,800 m height in 2010. These changes indicate that the cold hardiness of E. extimalis is on the rise. Physiological and biochemical analyses were performed for the insect's overwintering larvae from November 2011 to March 2012. The supercooling point (SCP) and freezing point (FP) ranged from −6.85°C to −12.49°C and from −6.23°C to −8.17°C, respectively, and both were at their respective lowest points in January 2012; the lowest points of water and fat contents (which did not vary to any extreme degree throughout the test period) were also observed in January 2012. Glycogen content varied from 2.42 mg/g to 4.56 mg/g. Protein content increased gradually at the first two months and reached its peak in January 2012 before dropping slightly. The activity of protective enzymes POD, CAT, and SOD varied with changes in environmental temperature, and each was at its lowest point in January 2012. With the exception of protein and glycerol content, other physiological and biochemical variances were generally parallel with environmental temperature, strongly indicating that E. extimalis has indeed developed cold hardiness.

포항시 장애인형 국민체육센터

건축사사무소 유앤피(UNP_You&Partners) 현대건축사 2018 월간 CONCEPT Vol.- No.236

Private-Source Educational Expenditure in Korea : Analysis and Implications

Han, You-Kyung RESEARCH INSTITUTE OF CURRICULUM INSTRUCTION EWHA 2005 East west education Vol.22 No.-

Private educational expenditure means the sum of the expenses individual household paid for educational activities but not processed through official accounting procedure. It includes private tutoring fees, books, room and board, school supplies and so on. Private educational spendings per student in the year of 2001 is 1,999 thousand won in pre- schools, 2,368 thousand won in elementary schools, 2,261 thousand won in middle schools, 2,307 thousand won in general high schools, 1,360 thousand won invocational high schools, 1,938 thousand won in junior colleges, 2,216 thousand won in industrial universities, 2,673 thousand won in four-year colleges and 2,330 thousand won in graduate schools. Total private educational expenditure estimated from these sample figures is 18,782 billion won for pre-school, middle school and high school students together and 7,891 billion won for students in higher education institutions. What we are most concerned about regarding the private educational expenditure is the amount of expenditure for the private tutoring. The percentage of private tutoring expenses on the average is about 48.6. Private educational spending per student has declined compared to the spending in 1998. Especially the spending for elementary school students, general high school students and college students had declined greatly. However, the spending for middle school students, vocational high school students and junior college students has slightly increased. The portion out of GDP also declined to 5.61% in 2001 from 6.53% in 1998.