Prepreg is an abbreviation of Preimpregnated Materials. It is a sheet-type product in which a matrix is ​​impregnated with reinforced fiber. The prepreg has very different properties depending on the orientation of the fibers and the weaving method, and the orientation of the fibers plays an important role in determining the mechanical strength of CFRP. Short and randomly oriented reinforcing fibers show isotropy, while long, unidirectional reinforcing fibers exhibit anisotropic behavior and are strongest when the applied load is parallel to the reinforcing fibers. Classification by the direction of the fiber is divided into unidirectional, orthogonal, multiaxial, and the like. Uni-directional refers to a state in which almost all fibers in the fabric are aligned in one direction. When the fibers used as reinforcing materials are aligned in one direction, the fibers are used in a straight line without twisting during the fabric production process, and there is an advantage in that the amount of fibers used as a whole can be minimized. A uni-directional prepreg exhibits different cutting forces depending on the stacking orientation angle. In this experiment, the optimal cutting conditions for a uni-directional prepreg 45 degree orientation angle specimen are presented.

Heatwaves are one of the most common phenomena originating from changes in the urban thermal environment. They are caused mainly by the evapotranspiration decrease of surface impermeable areas from increases in temperature and reflected heat, leading to a dry urban environment that can deteriorate aspects of everyday life. This study aimed to calculate daily maximum ground surface temperature affecting heatwaves, to quantify the effects of urban thermal environment control through water cycle restoration while validating its feasibility. The maximum surface temperature regression equation according to the impermeable area ratios of urban land cover types was derived. The estimated values from daily maximum ground surface temperature regression equation were compared with actual measured values to validate the calculation method’s feasibility. The land cover classification and derivation of specific parameters were conducted by classifying land cover into buildings, roads, rivers, and lands. Detailed parameters were classified by the river area ratio, land impermeable area ratio, and green area ratio of each land-cover type, with the exception of the rivers, to derive the maximum surface temperature regression equation of each land cover type. The regression equation feasibility assessment showed that the estimated maximum surface temperature values were within the level of significance. The maximum surface temperature decreased by 0.0450˚C when the green area ratio increased by 1% and increased by 0.0321˚C when the impermeable area ratio increased by 1%. It was determined that the surface reduction effect through increases in the green area ratio was 29% higher than the increasing effect of surface temperature due to the impermeable land ratio.

본 연구는 5월 일중 수확시기, 예냉 유·무, 예냉 및 저장 온도가 수출 딸기 ‘매향’의 상품성에 미치는 영향을 알아보고자 수행하였다. 과피의 착색이 60±5%로 진행된 딸기를 오전 07:00시와 오후 15:00시에 각각 수확하였다. 수확 수 일부 딸기는 예냉고에서 품온을 0, 2, 4°C로 각각 3시간 동안 예냉처리하였으며, 일부는 상온에 보관하였다. 이후 딸기는 처리별로 저장온도 4, 8, 10°C로 설정된 저온저장고에 저온 저장하였다. 저장고에 14일간 저장하면서 딸기의 무게 손실률, 경도, 당도, 색도, 잿빛곰팡이 발생률을 이틀 간격으로 조사하였다. 오전 07:00시와 오후 15:00시 수확 모두 저장기간이 경과함에 따라 수확 시 무게에 비해 무게 손실률이 증가하였으며, 오전 07:00시 수확에 비해 오후 15:00시 수확에서 처리에 따른 무게 손실률 차이가 컸다. 경도는 오전 07:00시와 오후 15:00시 수확 각각 6일째와 8일째까지 감소하다가 다시 증가하는 경향을 보였다. 오후 15:00시 수확 시 예냉하지 않은 10°C 저장 처리는 저장 후 2일째에 과실의 경도가 유의적으로 가장 낮게 나타났다. 당도는 오전 07:00시와 오후 15:00시 수확에서 예냉처리하고 낮은 저장온도 처리에서 저장일수 경과함에 따라 높은 수치로 유지되는 경향을 보였다. 색도는 일중 수확시기 및 예냉 유·무에 관계없이 낮은 저장온도에서 명도를 나타내는 ‘L’ 값은 유의적으로 높았고 적색도를 나타내는 ‘a’ 값은 유의적으로 낮은 경향을 보였다. 잿빛곰팡이 발생률은 오전 07:00시 수확에 비해 오후 15:00시 수확 시 발생률이 높았으며, 공통적으로 예냉을 한 후 10°C에 저장한 처리에서 잿빛곰팡이 발생률이 현저히 높았다. 본 연구에서 07:00시에 수확하여 0°C 예냉 후 4°C에 저장하는 것이 가장 우수한 저장성을 유지하였다. 그러므로 온도가 낮은 오전에 수확을 하고 낮은 온도에 예냉과 저장을 하는 것이 바람직하다고 판단된다.

목적: 20대의 비중년안과 50대의 중년안의 일과 전∙후 폭주근점과 최대조절력의 변화를 알아보고자 하였다. 방법: 안질환이 없는 20대(20.07 ± 0.57 세) 비중년안 15명과 50대(52.83 ± 4.43 세) 중년안 15명을 대상으로 일상 환경의 조도(약 500 Lux)에서 오전 7~8시와 오후 7~8시에 각각 폭주 근점과 최대조절력을 측정하여 변화량을 비교하였다. 폭주근점은 폭주근점자를 이용하여 3회 반복하여 흐림/분리/회복점을 측정하였으며, 최대조절력은 Push-up 방법을 이용하여 우안/좌 안/양안의 조절력을 측정하였다. 통계분석은 SPSS 20을 사용하여 Paired t-test 방법으로 비 교 분석하였다. 결과: 폭주근점의 경우 50대 중년안에서 흐린점이 2.40±3.40 cm 증가하였으며(p=0.000), 분리점은 0.88 ±2.11 cm(p=0.012), 회복점은 1.13±3.39 cm 증가하였다(p=0.044). 20대 비중 년안은 흐린점이 1.12±1.98 cm 증가하였으며(p=0.000), 분리점은 0.72±1.76 cm (p=0.009), 회복점은 0.46±3.03 cm (p=0.319) 증가하였다. 최대조절력의 경우 50대 중년안에서는 양안에서 0.52±0.80 cm 감소하였으며(p=0.036), 우안 0.65±0.96 cm (p=0.032), 좌안 0.71±0.88 cm(p=0.013)로 유의하게 감소하였다. 하지만 20대 비중년안의 경우 양안 0.24±3.65 cm 감소(p=0.800), 우안 0.36±3.55 cm 증가(p=0.732), 좌안 0.066±3.73 cm 감 소(p=0.947)로 변화가 통계적으로 유의하지 않았다. 결론: 20대 비중년안의 경우 폭주근점은 일과 후 증가하는 양상을 보였으나 최대조절력의 경우 유의한 변화를 관찰할 수 없었다. 50대 중년안의 경우에는 폭주근점과 최대조절력 모두 유의한 변화를 보였으며 그 차이가 20대에 비해 조금 더 큰 경향을 볼 수 있었다.

본 연구는 조직 내 구성원들이 일상적, 비일상적 업무 수행시 마주하는 다양한 문제에 부딪혔을때 이를 해결할 수 있다는 자신감과 각 개인의 업무에 대한 의미감이 그들의 과업성과에 어떠한 영향을 미치는지 확인하고, 이들 관계에서 조직 상사의 변화리더십의 조절효과를 확인하고자 설계되었다. 조직구성원들에 게 부여된 과업의 고성과에는 성공적으로 수행할 수 있다는 자신감과 자신이 수행하고 있는 업무가 개인 차원은 물론이거니와 조직차원에서도 중요하고 가치있다고 지각하는 일 의미감이 긍정적인 영향을 미칠 것이라는 가설 검증을 위하여 국내 기업의 다양한 업종, 직위 및 성별, 연령의 연구대상 390명을 선정하여 이들을 대상으로 설문을 실시하고 통계 분석하였다. 분석 결과, 첫째, 문제해결자신감이 업무성과에 유의한 정(+)의 영향관계를 미치는 것으로 나타났다. 둘째, 일 의미감이 업무성과에 유의한 정(+)의 영향관계를 미치는 것으로 나타났다. 셋째, 조절효과 검증 에서 일 의미감이 업무성과에 미치는 영향력에는 변화리더십이 조절효과를 보였으나, 문제해결자신감이 업무성과에 미치는 영향에 대하여는 변화리더십이 조절효과를 가지지 않는 것으로 나타났다. 본 연구의 결과를 통한 의의와 시사점은 다음과 같다. 조직구성원들의 업무성과 향상을 위해서는 과업 수행 시 원만하고 성공적으로 문제를 해결할 수 있는 자신감을 가질 수 있도록 동기부여하고 효율적인 방법을 제시해주어야 하며, 결과에 대한 피드백 등을 통하여 개인이나 조직차원에서 부딪히는 문제상황 에서 효과적인 해결책을 탐색하고 식별할 수 있도록 지원 및 관리가 필요함을 제시한다. 또한 조직구성원 에게 부여된 업무에 대한 의의와 중요성을 발견하고 스스로 업무에 동화되어 높은 가치를 두느냐에 따라 업무성과가 달라짐을 확인하였다. 따라서 조직은 개인의 업무에 대한 의의와 역할을 명확히 제시하고, 또 한 개인 스스로 일에 대한 목적과 가치를 발견할 수 있도록 동기 부여할 수 있는 기회를 제공해주어야 할 것이다. 끝으로 연구 상의 한계와 향후 연구방향을 논의하였다.

목적 : 본 연구는 일반초등학교에 입학한 장애아동이 학교에 적응하는 과정과 장애아동을 초등학교에 입학시킨 부모들의 경험, 변화와 그 의미에 대해 알아보고자 하였다. 연구방법 : 부모들의 경험과 변화에 대해 심층적으로 이해하고 기술하기 위해 현상학적 연구방법을 이용한 질적 연구를 사용하였다. 연구의 참여자는 초등학교 입학 후 1년간의 과정을 거친 장애아동의 어머니 4명이다. 자료수집을 위해 세 단계의 심층면담을 대상자별로 진행 하였다. 분석은 Colaizzi의 분석방법을 사용하여 연구 참여자로부 터 기술된 내용에서 의미 있는 문장이나 구를 추출하고, 이를 기반으로 일반적이며 추상적인 의미단위를 만들고 주제와 주제 묶음으로 범주화한 후 경험의 본질적 구조를 기술하였다. 결과 : 연구를 통하여 도출된 경험과 의미는 다음과 같다. 첫째, 준비가 되어 있지 않음으로 인한 초조, 불안, 후회를 하고 있음을 알 수 있었다. 둘째, 장애 아동이 취학 할 학교를 선택함에 있어 고민과 갈등이 있었다. 셋째, 아이가 잘할 수 있을까 하는 염려, 불안감과 두려움으로 긴장의 연속선상에 있으면서도 기대감을 가지고 있었다. 넷째, 교사와의 관계에서 대화와 시간의 흐름을 통한 신뢰가 바탕이 되어 가까워지는 것을 볼 수 있었다. 다섯째, 일 년간의 학교생활을 바탕으로 어렵지만 성장해 가는 어머니 자신과 아이의 모습을 발견하게 되었다. 결론 : 본 연구결과를 통해 나타난 장애아동 부모의 경험과 변화, 어려움을 이해하여 아동의 특성과 취학을 앞둔 아동의 시기적 상황에 맞는 취학 전 학교적응 프로그램(적절한 가족 지원 및 통합지원 작업치료 서비스)을 개발하고 시행하여 성공적인 전이가 될 수 있도록 해야 할 것이다.

The main goal of this study is to examine elementary school students’ four-nights-and-five-days experience at an English village in Seoul, focusing on what English learning experiences they had and what kind of changes had been made in their attitudes towards learning English. Pre- and post-surveys were conducted to examine their learning experiences in the village and the changes in their attitudes toward learning English. About 350 students participated in the pre- and post-surveys and additional ten students also participated in an interview with the researcher to draw more detailed information about their experiences in the English village. Descriptive statistics and paired samples t-tests were conducted to answer the main research questions. The results revealed that despite the short term of residence at the English village, the students seemed to have had relatively active engagement in learning both listening and speaking skills, but not as much in learning reading and writing skills. Also, although the village could possibly provide students with rich opportunities to have an active engagement and interaction with peers and English speaking teachers, it seemed that there existed some limitations in having such experiences inside and outside of the classrooms. Finally, students showed some changes in their attitudes or strategies toward learning English after the short term of residence, saying that they wanted to have more diverse engagement with English, such as 'having a conversation with foreigners on the Internet’, ‘keeping a journal in English,’ ‘having a conversation in English with other peers,’ and so on.

태양 복사의 지구 대기 산란광을 근 적외선 영역에서 분광 관측하여 H2O와 O2 흡수선을 측정하고 이것으로 태양 복사량에 따른 두 기체의 등가폭 변화를 계산하였다. O2는 태양 복사량이 증가할수록 등가폭이 줄어들고 복사량이 감소할수록 커지는 경향을 보였고, H2O는 그 반대의 경향을 보였다. 특히 두 기체가 만드는 흡수선 등가폭의 합은 하루 중에 대체로 일정한 경향을 보였다. 본 연구에서는 이것이 태양광에 의한 광해리와 재결합이 O2와 H2O에 있어서 상호 보완적으로 일어나기 때문으로 추측한다.

The 5 working day's a week increase to fixed cost. Specially, the small & medium size company more increase to manufacturing cost. The introduction of 5 working day's rule influence to labor cost in manufacturing cost. Also, it make disappearance to fixed cost of 0.5 working day. Almost manufacturing company expect to have difficulty in product cost. The case of japan, many manufacturing company move to Asian countries after introduction of 5 working day's a week rule. The purpose of this study are the analysis of change product cost and suggest to solutions of productivity for a type of industries..

The 5 working day's a week increase to fixed cost. Specially, the small ＆ medium size company more increase to manufacturing cost. The introduction of 5 working day's rule influence to labor cost in manufacturing cost. Also, it make disappear to fixed cost of 0.5 working day. Almost manufacturing company expect to have difficulty in product cost. The case of japan, many manufacturing company move to Asian countries after introduction of 5 working day's a week rule. The purpose of this study are the analysis of change product cost and suggest to solutions for a type of industries.

The variation of the urban water demand and the amount of water in the distribution reservoir was studied with time for a day. The city of Kwangju in Korea was selected as a study area. The population of Kwangju in the end of 1993 was more than one million and two hundred thousand peoples. The average of daily water use in 1993 was about three hundred and fifty thousand tons a day. One day was devided into 12 divisions with a 2 hour increment. The water use demand related to the amount of water in the distribution reservoir was observed for the given time interval of a day. The water use index was defind in percentage that indicates the ratio of the amount of water use for a time interval to the amount of water use for a day. The water use index with consideration of the water stored in the reservoir was found to be useful to manage and to operate the water supply systems in real time.

In this paper, for selected station of 8 clusters in East Asia (Park, 2017) more (less) warming periods than the wintertime mean warming of intra-seasonal fluctuation curves were taken and their means were computed. Long term trends and synoptic features of the mean temperature changes were examined. In most clusters, around the third of January there were less warming periods (LWP) than the mean wintertime warming. On the contrary, in February and the first and second of January there were more warming periods (MWP) than the winter mean or LWPs having a warming trend with statistical signicance. Time series of the daily Siberian High indices showed they had been weakening in February and being stagnant around late January. In most stations, the mean temperatures of MWP or LWP had large negative correlation coecients with the Siberian high intensity. is result explains the occurrences of MWPs in most clusters in February and LWPs in late January. In cluster B there were LWPs in early February due to the influence of the Aleutian Low which were strengthening in that periods. Cluster E showed different features without LWPs in late January. The cluster is considered to be affected by its plateau environment of West Yúnnán and the Tibet Plateau which prevent cold air of the lower atmosphere in Northern Asia flowing southward, and by the regional atmospheric circulation of 500hPa surface centered in this region.

In this study, the intra-seasonal fluctuation (ISF) of wintertime temperature change in East Asia was classified by a cluster analysis of complete linkage. A ISF of temperature change was defined as a difference of synthesized harmonics (1 to 36 harmonic) of daily temperature averaged for 30 years (1951~1980, 1981~2010). Eight clusters were gained from the ISF curves of 96 stations in East Asia. Regions of the cluster C, G and A1 seem to be affected by the Siberian High (SH) center, whereas the cluster A1, A2, D, B and F by the SH main pathways. Regions of the cluster E are apart from the SH main pathways and appear to be in the area of influence of other factors. Wintertime temperatures in Northwest China (clusters C, G) and Northeast China (cluster A1) were increased very largely. In most clusters, around late January there were less warming periods than the winter mean of the mean ISF of the clusters, before and after this time there were more warming periods than the winter mean.

The classification of airflow patterns during high ozone (O3) and PM10 episodes on Jeju Island in recent years (2009-2015), as well as their correlation with meteorological conditions according to classified airflow patterns were investigated in this study. The airflow patterns for O3 and PM10 were classified into four types (Types A-D) and three types (Types E-G), respectively, using the HYbrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) model and synoptic weather charts. Type A was the most dominant airflow pattern for O3 episodes, being characterized by the transport of airflows from urban and industrial areas in China with the highest frequency (about 69%, with a mean of 67 ppb). With regard to the PM10 episodes, Type E was the most dominant airflow pattern, and was mostly associated with long distance transport from Asian dust source regions along northwesterly winds, having the highest frequency (about 92%, with a mean of 136 μg/m3). The variations in the concentration of O3 and PM10 during the study period were clarified in correlation with two pollutant and meteorological variables; for example, the high (low) O3 and PM10 concentrations with high (low) air temperature and/or wind speed and vice versa for precipitation. The contribution of long-range transport to the observed PM10 levels in urban sites for different airflow patterns (Types E-F), if estimated in comparison to the data from the Gosan background site, was found to account for approximately 87-93% (on average) of its input. The overall results of the present study suggest that the variations in O3 and PM10 concentrations on Jeju Island are mainly influenced by the transport effect, as well as the contribution of local emissions.

The study selected 10 regions among major Korean cities. Then the study classified the yearly change of relative humidity of those regions for 37 years based on 1996 (from 1974 to 2011) aimed at high temperature days, and examined them by stage regarding daily maximum temperature. For large cities and small cities, in general relative humidity had been likely to increase at high temperatures of 30℃ or over before 1996, whereas it has decreased since 1996. For suburban areas, relative humidity had been prone to diminish before 1996, whereas it has been likely to either increase since 1996 or rarely some of the cities have not shown any change. The increasing tendency of relative humidity before 1996 in large cities and small cities is believed to be because of an increase of the latent heat of vaporization by the supply of steam from cooling towers established in downtown areas. Meanwhile, the decreasing tendency from 1996 is concluded to be caused by the change from counter-current circular cooling towers, which produce a great quantity of steam including arsenic acid, to cross-flow cooling towers, which produce hardly any steam containing arsenic acid. This change was in accordance with the modification and pursuit of an urban planning law that ordered cooling towers that had been installed on rooftops be installed in the basement of buildings in consideration of a “Green network creation” project by the Ministry of Environment, urban beautification, concerns since 1996 over building collapses, and according to an argument that steam containing arsenic acid could be harmful to human health owing to chemicals contained in the water in the cooling tower in summer.

The purpose of this study was to analyze the effects of partial solar eclipse on 21 May 2012 in Korea on meteorological variables in Busan. 0800 LST(Local Standard Time) solar radiation was similar or lower than 0700 LST solar radiation, and sunshine duration decreased by 0.2∼0.5 hours in Busan and great cities under the influence of the partial solar eclipse. Temperature drop due to the partial solar eclipse was 0.2∼2.0℃, time taken to arrive at maximum temperature after onset of eclipse was 8∼62 minutes, and time taken to arrive at minimum temperature after maximum eclipse was -9∼17 minutes in Busan. Change of wind speed was negligible as partial solar eclipse occurred in the morning. Soil temperature of 5 ㎝was minute as well, the increase of soil temperature due to sunset was delayed by more than 1 hour.