• 대한수의학회지
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• 제53권4호
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• pp.231-237
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• 2013

This study aimed to assess the attraction effect against Lycorma delicatula and antioxidant activity of hexane, chloroform, butanol and water fraction obtained from Ailanthus altissima methanol extract. The attraction effect of chloroform fraction showed the highest activity (47%) as compared to that of other fractions. In the DPPH radical scavenging activity, methanol and butanol fraction showed higher antioxidant activity than other solvent fractions. From the above results, the potential chloroform fraction was further performed by local irritation test in New Zealand white rabbits. In eye irritation test, chloroform fraction showed moderate irritant at high concentration 0.5 g/site/mL, but there was no eye irritation at low concentration (0.05 g/site/mL). In accordance with the Draize evaluation of skin irritation, the primary irritation index was calculated to 3.3 and 0.68 at high (0.5 g/site/mL) and low concentration (0.05 g/site/mL) causing moderate and mild irritation, respectively. On the basis of this study, Ailanthus altissima chloroform fraction could be safely considered to be a candidate of attractant against Lycorma delicatula.

• Structural Engineering and Mechanics
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• 제70권2호
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• pp.143-152
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• 2019

In this study, stochastic responses of a cable-stayed bridge subjected to the spatially varying earthquake ground motion are investigated for variable local soil cases and wave velocities. Quincy Bay-view cable-stayed bridge built on the Mississippi River in Illinois, USA selected as a numerical example. The bridge is composed of two H-shaped concrete towers, double plane fan type cables and a composite concrete-steel girder deck. The spatial variability of the ground motion is considered with the coherency function, which is represented by the components of incoherence, wave-passage and site-response effects. The incoherence effect is investigated by considering Harichandran and Vanmarcke model, the site-response effect is outlined by using hard, medium and soft soil types, and the wave-passage effect is taken into account by using 1000, 600 and 200 m/s wave velocities for the hard, medium and soft soils, respectively. Mean of maximum response values obtained from the analyses are compared with those of the specific cases of the ground motion model. It is concluded that the obtained results from the bridge model increase as the differences between local soil conditions cases of the bridge supports change from firm to soft. Moreover, the variation of the wave velocity has important effects on the responses of the deck and towers as compared with those of the travelling constant wave velocity case. In addition, the variability of the ground motions should be considered in the analysis of long span cable-stayed bridges to obtain more accurate results in calculating the bridge responses.

• 실천공학교육논문지
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• 제11권2호
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• pp.219-229
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• 2019

The purpose of this study was to examine the effect of on-site training environments and goals on learning outcomes of trainees. For this purpose, the study analyzed survey data collected from 752 students who participated in KOREATECH's Industry Professional Practice (IPP) on-site training program from 2017 to 2018. The following summarizes some important findings from the study results: First, on examining whether the effect of job characteristics on the academic competencies differs according to the characteristics of the group, it was found that the factors that affect the whole group were job content, coaching, and welfare benefits, but the effect of job scope was statistically significant. Second, on examining whether the effect of job characteristics on job competencies differs according to the characteristics of the group, it was found that the factors that affect the whole group were job content, coaching, and job scope, but the effect of welfare was statistically significant. Analyzing by training goals, it was found that the major influencers were job content in the Recruitment-intended group; and job content, coaching and job scope in the Training-intended group. Based on the results, the implications of the study and follow-up studies are suggested.

• 한국환경생태학회지
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• 제14권2호
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• pp.103-110
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• 2000

본 연구는 1994년 4월에서 8월까지의 기간 동안 지리산국립공원내 임걸령 지역과 노고단 지역에서 등산로가 개설되어 있는 지역과 개설되어 있지 않은 지역을 대상으로 등산로가 번식기 조류 군집에 미치는 영향을 파악함으로써 등산로의 합리적인 관리방안을 모색하고가 실시하였다. 조사지역별 서식지 환경은 노고단 등산로 지역과 노고단 지역이 유사하였으며 임걸령 등산로 지역과 임걸령 지역이 각각 유사하였다. 4개 지역에서 조사를 실시 한 결과 총 25종의 조류가 관찰되었으며. 그 중 18종이 번식한 것으로 파악되었다. 번식기 조류 군집의 종 수 및 번식 쌍수와 길드구조에 있어서 산림 지역과 등산로 지역간에 큰 차이를 보이지 않아, 등산로가 조류 군집에 미치는 영향은 크지 않았던 것으로 판단된다. 이는 등산로의 상층식생이 울폐되어 상층수관이 연결되어 있었으며, 등산로 주변에 하층식생이 발달해 있는 지역이므로 조류 군집에 큰 영향을 주지 않았던 것으로 보여진다. 그러므로 등산로의 개설 혹은 현재 등산로의 유지 및 관리를 위해서 등산로 주변의 수관 울페율을 높게 유지할 수 있도록 등산로 주변의 대경목 및 상층임관이 보호 및 관리되도록 해야 하고, 또한 주변의 식생, 특히 관목층 및 하층식생의 보호 및 유지가 할 것으로 판단된다.

• 한국콘텐츠학회논문지
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• 제10권3호
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• pp.241-249
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• 2010

본 연구의 목적은 부산광역시 소재 병원급 이상 의료기관에 근무하는 병원 홈페이지관련 담당 관리자를 대상으로 병원홈페이지 관리 운영 실태와 홈페이지가 병원경영에 미치는 효과를 분석하여 홈페이지를 활용한 마케팅 전략의 기초자료를 제공함에 있다. 이를 위하여 부산광역시 소재 병원급 이상 53개의 병원급 이상의 의료기관 홈페이지 관리자들을 대상으로 2008년 5월 1일부터 5월 25일까지 25일간 연구자가 직접 방문하여 인터뷰와 설문조사를 실시하였다. 병원홈페이지 관리자들의 설문내용은 일반적인 특성, 홈페이지 제작, 관리 운영, 영향, 부가기능, 정보교류 항목으로 구성 하였으며 분석한 결과는 다음과 같다. 첫째, 병원홈페이지 제작관리 및 운영에 있어서는 제작시기는 2001-2005년이며, 외부업체가 주로 관리하고, 제작 목적은 병원소개이며, 1년 기준으로 홈페이지를 개편하고, 100-300만원 미만의 운영예산과 병원소개, 고객만족센터 그리고 온라인 답변 게시가 가장 높은 것으로 나타났다. 둘째, 병원홈페이지 운영에 영향을 미치는 것은 병원소개, 진료예약, 이용안내, 의료정보제공, 고객상담, 진료안내이고 이들은 대부분 병원경영에 영향을 미치고 있다고 인식하고 있었다. 따라서 내부고객만족을 위해 병원홈페이지에 의료정보제공과 메뉴개선은 직원들의 지속적인 관심을 통하여 향상시키도록 노력하여야 할 것이다.

• 교육시설
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• 제11권4호
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• pp.15-24
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• 2004

The purpose of this study is to suggest some alternative on site planning of elementary school through investigating the effects of geographical and urban environment on the site. For this, we selected and surveyed 35 schools in Gwangju. The results of this study are as follows. 1) We cannot find out the differences from the use of elementary schools sites on slopes of sites. However, the sunken space between H type buildings in the site slopes facing east or west and the placing the playground on the north side of the site slopes facing north have some problems 2) The number of adjacent road and surrounding environment didn't show any effect. To separate between cars and pedestrians, we need some plans to block cars on the pedestrian gateway and it is much better to intensify the parking area near the school gate that cars come in and out. 3) The degree of satisfaction on the outdoor facilities of these cases shows low level. Therefore, to use the site of schools efficiently, we should secure the spacious playground and make plans to provide some spaces around school building for the static activities of students and teachers. 4) Most of all, the site which is suitable for educational environment should be selected. and also Special Code on the urban plan should be established to develop this one.

• 한국환경보건학회지
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• 제28권2호
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• pp.99-108
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• 2002

This study was carried out to evaluate the Physicochemical characteristics of mined waste(separated waste and soil) and to predict environmental effect of an old landfill site located at north of Seoul. Municipal solid waster(MSW) had been disposed of at the old landfill site used in this study for about 2 years(1990-1992). The old landfill site selected for this study had accepted mainly municipal solid waste. The landfill-mined waste contained separated waste (40.9%) and soil(59.1%) by wet weight basis. The separated waste consisted of combustible(91.0%) and non-combustible(9.0%). The combustible waste was mainly non-biodegradable plastics. The low heating value of the separated combustible waste, which is calculated by Dulong's equation, was as high as 3,470kcal/kg. According to the Korean Extraction Procedure, separated waste and soil were proved to be not hazardous. The total content of heavy metal in the separated waste and soil met standard of California State, USA. Therefore the separated waste may be relandfilled at a sanitary landfill site and/or burned up at an incinerator, and the separated old soil may be used ad landfill cover-soil at a sanitary landfill site. Water quality of two streams was grade IV, of which water could be used as industrial and agricultural water. The streams near the landfill site might not be contaminated by leachate from the old landfill site. It was estimated that organic matter in the old landfill site would not be actively biodegraded within a short period of time.

• 공학교육연구
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• 제21권1호
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• pp.44-55
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• 2018

The purpose of this study is to investigate the relationship between post - employment job satisfaction and both short-term (4-12 weeks) and long-term (12+weeks) on-site training. For this purpose, 405 graduates who had completed on-site training (205 short-term, 200 long term) during the school year were surveyed. The results of the comparative analysis of both short-term and long-term on-site training participants are as follows: In both short-term and long-term on-site training, it was found that on-site performance during the school year did not directly affect post-employment job satisfaction. In the case of short-term on-site training participants, job match and organizational commitment were found to have no mediating effect on the correlation between on-site training performance and job satisfaction. On the other hand, in the case of long-term on-site training participants, the analysis showed that job match and organizational commitment had mediating effects on the correlation between on-site training performance and job satisfaction. These effects are not solely attributable to differences in duration of training; the differences in operating systems and the degree of preparation derived from these systems also affect the level of on-site training for students, businesses, and schools. This paper summarizes these findings and suggests the following improvement plans for on-site training in the future: First, short-term on-site training is required to establish a systematic basis in order to enhance students' preparedness level. Second, both short-term and long-term on-site training should improve the skills and field understanding for students' majors through systematic quality management during the training period. Third, it is necessary for universities to increase expectations and quality of short-term on-site training for all involved while simultaneously reducing the gap between educational goals and practice in this field.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 제37회 하계학술대회 논문집 A
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• pp.444-445
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• 2006

The proposed site selection for transmission system construction is applied by KEPCO's regulation of the site selection criteria and it is confirmed through the deliberation of site selection committee and talking with local authority, by means of study on Present status and site survey, to verify impediment of national land use and development plan. Therefore, it is true that KEPCO has difficulty in timely completion of power facility construction because of civil appeals due to insufficiently evaluate resistance factor of stakeholder and stubborn resistance of inhabitants. This paper describes the PEES(power effect estimation system) which contributed to timely completion of transmission system construction to solve the above difficulty by utilizing IT(Information Technology) such as GIS(Geographic Information System) and LiDAR for the proposed site section. PIES evaluates project impacts on commencement of construction and finds out counter measures then makes public construction information after prediction and analysis of stakeholder's resistance factor.

• 한국지진공학회논문집
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• 제28권5호
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• pp.249-255
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• 2024

Strong ground motions at specific sites can cause severe damage to structures. Understanding the influence of site characteristics on the dynamic response of structures is crucial for evaluating their seismic performance and mitigating the potential damage caused by site effects. This study investigates the impact of the average shear wave velocity, as a site characteristic, on the seismic response of low-to-medium-rise reinforced concrete buildings. To explore them, one-dimensional soil column models were generated using shear wave velocity profile from California, and nonlinear site response analyses were performed using bedrock motions. Nonlinear dynamic structural analyses were conducted for reinforced concrete moment-resisting frame models based on the regional information. The effect of shear wave velocity on the structural response and surface ground motions was examined. The results showed that strong ground motions tend to exhibit higher damping on softer soils, reducing their intensity, while on stiffer soils, the ground motion intensity tends to amplify. Consequently, the structural response tended to increase on stiffer soils compared to softer soils.