• 디지털융복합연구
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• 제14권2호
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• pp.197-208
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• 2016

본 연구에서는 데이터마이닝의 회귀분석 기법과 의사결정 나무분석 기법을 사용하여 중학생의 삶의 만족도에 영향을 끼치는 요인을 분석하였다. 이를 위해 청소년들을 대상으로 한 한국아동 청소년패널조사(KYCPS) 중1패널 데이터 3차 년도 자료를 활용하였다. 회귀분석을 통해 추출된 공통 영향요인은 자아 존중감, 우울, 전체 성적 만족도, 지역사회 인식, 진로 정체감, 연간 비행 피해 경험 유무, 형제자매 유무, 신뢰, 행동통제, 주의집중으로 나타났다. 이를 통해 중학생의 삶의 만족도는 개인의 정서문제, 자아인식, 또래 애착, 학습습관, 가정환경 요인 등이 복합적으로 영향을 미치는 것을 알 수 있다. 이 중에서 중학생의 삶의 만족도에 예측하기 위한 중요한 영향을 미치는 요인을 분석하기 위해서 의사결정 나무분석 기법을 사용하여 분석한 결과, 자아 존중감, 우울, 진로 정체감, 주의집중으로 나타났다.

• 보존과학연구
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• 통권17호
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• pp.123-160
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• 1996

There have been many studies and experiments regarding exhibition lighting. Many experiments on photochemical damaging effect and visibility resulted in a practice limited to assigning light levels and adjusting annual exposure time. The three damaging factors to the artifacts are intrinsicsusceptibility to absorb radiant energy, spectral distribution of light source and intensity of illumination and time of exposure. Dividing all the artfacts into three categories to suggest a recommended illuminance level causes some problems. Blue wool, for example, used as the reference material for susceptibility, is not a standard material representing museum artifacts. In the most light sensitive category, ISO class I or anything below have been excluded. The exposure time of one soure can be three times more than another sourece. The spectral distribution of the light source and the relative spectral responsibility of the artifact are not considered in the practice. So in case of very light sensitive material, the recommended illuminance is only the referring value and it is indispensable to check the characteristic of susceptibility of each artifacts. Daylighting is prevailing method to solve the psychological need of the visitors. However, it sould transparent, and should not diffused, and the green-house effect must be considered. llluminance uniformity should based on the maximum illuminance to handle the limitation of exposure for the conservation of a large sensitive object such as a painting. Damage index is not absolute reference for selecting the lighting source because it is experimented from the paper of low grade then calculated. Visibility should be increased by reducing the visual noiseand by planning of appropriate luminance contrast. This paper reviews the problems with the previous studies and experiment sand the current exhibition lighting design practice. The plan for museum showcase lighting is to check the susceptibility and to raise the visibility simultaneously.

• 한국환경과학회지
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• 제19권1호
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• pp.69-80
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• 2010

Today's fundamental purpose of environmental education is to fulfill people's desire of living in a pleasant environment and at the same time promoting individualistic and collective environmentally friendly behaviors. In order to achieve these purposes, it is very important that each person holds an environmentally friendly mind that constantly tries to preserve and protect the environment which should be acquired through experiencing the importance of the environment. In order to increases the sense of attachment of people and the natural environment, the direction of environmental education should carry out education on environment related knowledge and the condition of environment damage side by side. The direction of environmental education should consider the cultivating student's awareness for active participation on matters related to the environment and to change their behaviors towards the environment. This study has tested the effect of reflective writing activities about the environment on the environmental sensitivity and willingness to act of 5th grade primary school students. For the sole purpose of this study, 70 students out of 141 5th graders of M Primary School were divided as the experimental group, and another 71 students were divided as the control group. The experimental group participated in 10 activities in where they were asked to express their thoughts and feelings in writing regarding 10 environmental problems occurring near the M Primary School. The control group participated in 10 environmental education lectures focusing on the lecturer. The results were as following. First, the reflective writing activities about the environment were effective in the environmental sensitivity of primary school students. Second, the reflective writing activities about the environment can affect the environmental willingness to act of primary school students. Third, there was a statistically significant correlation between environmental sensitivity and environmental willingness to act.

• 대한환경공학회지
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• 제31권3호
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• pp.223-231
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• 2009

환경친화적인 도로노선대 선정을 위하여 공간분석기능을 활용한 GIS 기반 환경성평가 기법을 개발하고 실제 사례노선을 통하여 검증해 보고자 하였다. 도로건설 사업으로 인해 환경훼손을 가져오는 요인에 관한 분석을 바탕으로 영향범주를 구체화 시킨 후, 이에 관한 다양한 등급화 사례 및 법적 규제에 관한 문헌조사를 수행하였다. 공간 분석을 위한 정량화 모델로는 AHP를 선택하였다. 환경성 평가항목으로는 지형지질, 동식물, 토양생태, 수질, 대기질, 소음진동, 토지이용, 위락경관의 8개 항목을 선정하고 그에 따른 세부지표를 구성하여 이를 3등급 체계로 구분하였다. 가중치 산정을 위해 쌍대비교에 의한 설문수행 결과 동식물 1등급의 가중치가 0.191로 가장 높게 산출되었다. 위 방법을 사례지역에 대하여 검증한 결과 가장 환경친화적인 도로노선대를 생성할 수 있었다.

• Journal of Trauma and Injury
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• 제27권3호
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• pp.84-88
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• 2014

The severity of blunt hepatic injury correlates with internal organ damage. We experienced a patient, who had an extensive crushed liver injury. The patient was a 28-year-old man, who was involved in a traffic accident in which a wheel ran over his right upper abdomen. A grade V severe hepatic laceration was diagnosed with computed tomography. His vital signs were stable, so we could wait for times with conservative management. Bile leakage led to biloma and bile spillage into the peritoneal space. Selective percutaneous drainage was needed to control the several biloma. After four months of conservative management, could the patient was discharged in good condition.

• 한국임상수의학회지
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• 제33권5호
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• pp.295-299
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• 2016

A 2-year-old, 1.94 kg spayed female Toy Poodle was referred for revision surgery for patellar reluxation following surgery for bilateral medial patellar luxation (MPL). Intermittent non-weight-bearing lameness of the right hindlimb and weight-bearing lameness of the left hindlimb were evident on general inspection. A physical examination revealed that there was a bilateral grade 4 MPL. On radiographs, the medial and lateral trochlear ridge was bilaterally worn out. Patellar groove replacement (PGR) was performed in two stages to replace the bilateral femoral trochlea that had a severely worn out groove. Corrective femoral osteotomy with increasing anteversion angle, tibial tuberosity transposition, medial releasing, lateral imbrications and PGR were performed on the right hindlimb. Six months after surgery on the right hindlimb, a PGR prosthesis was positioned medially on the frontal plane and tibial tuberosity transposition and lateral imbrications were performed on the left hindlimb. Two weeks after surgery, reluxation of the patella occurred on the left hindlimb. The tibial tuberosity transposition was performed to realign the patella more laterally than the previous surgery, and a patellar sling was applied. Two years after the last surgery, the patient showed no pain on the stifle joint and satisfactory weight-bearing ambulation. Reluxation did not recur. PGR maybe a successful treatment for dogs with iatrogenically damaged and/or worn out patellar grooves.

• Journal of Cancer Prevention
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• 제21권2호
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• pp.95-103
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• 2016

Background: Excess energy supply induces chronic low-grade inflammation in association with oxidative stress in various tissues including intestinal epithelium. The objective of this study was to investigate the effect of high-fat diet (HFD) on intestinal cell membrane integrity and intestinal tumorigenesis in $Apc^{Min/+}$ mice. Methods: Mice were fed with either normal diet (ND) or HFD for 12 weeks. The number of intestinal tumors were counted and biomarkers of endotoxemia, oxidative stress, and inflammation were determined. Changes in intestinal integrity was measured by fluorescein isothiocyanate (FITC)-dextran penetration and membrane gap junction protein expression. Results: HFD group had significantly higher number of tumors compared to ND group (P < 0.05). Blood total antioxidant capacity was lower in HFD group, while colonic 8-hydroxy-2'-deoxyguanosine level, a marker of oxidative damage, was higher in HFD group compared to that of ND group (P < 0.05). The penetration of FITC-dextran was substantially increased in HFD group (P < 0.05) while the expressions of membrane gap junction proteins including zonula occludens-1, claudin-1, and occludin were lower in HFD group (P < 0.05) compared to those in ND group. Serum concentration of lipopolysaccharide (LPS) receptor (CD14) and colonic toll-like receptor 4 (a LPS receptor) mRNA expression were significantly higher in HFD group than in ND group (P < 0.05), suggesting that significant endotoxemia may occur in HFD group due to the increased membrane permeability. Serum interleukin-6 concentration and myeloperoxidase activity were also higher in HFD group compared to those of ND group (P < 0.05). Conclusions: HFD increases oxidative stress disrupting intestinal gap junction proteins, thereby accelerating membrane permeability endotoxemia, inflammation, and intestinal tumorigenesis.

• Advances in concrete construction
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• 제8권3호
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• pp.173-185
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• 2019

This article presents a comparative study of the effect of steel layouts on the seismic behavior of transition steel-concrete composite connections, both experimental and analytical investigations of concrete filled steel tube-reinforced concrete (CFST-RC) and steel reinforecd concrete-reinforced concrete (SRC-RC) structures were conducted. The steel-concrete composite connections were subjected to combined constant axial load and lateral cyclic displacements. Tests were carried out on four full-scale connections extracted from a real project engineering with different levels of axial force. The effect of steel layouts on the mechanical behavior of the transition connections was evaluated by failure modes, hysteretic behavior, backbone curves, displacement ductility, energy dissipation capacity and stiffness degradation. Test results showed that different steel layouts led to significantly different failure modes. For CFST-RC transition specimens, the circular cracks of the concrete at the RC column base was followed by steel yielding at the bottom of the CFST column. While uncoordinated deformation could be observed between SRC and RC columns in SRC-RC transition specimens, the crushing and peeling damage of unconfined concrete at the SRC column base was more serious. The existences of I-shape steel and steel tube avoided the pinching phenomenon on the hysteresis curve, which was different from the hysteresis curve of the general reinforced concrete column. The hysteresis loops were spindle-shaped, indicating excellent seismic performance for these transition composite connections. The average values of equivalent viscous damping coefficients of the four specimens are 0.123, 0.186 and 0.304 corresponding to the yielding point, peak point and ultimate point, respectively. Those values demonstrate that the transition steel-concrete composite connections have great energy dissipating capacity. Based on the experimental research, a high-fidelity ABAQUS model was established to further study the influence of concrete strength, steel grade and longitudinal reinforcement ratio on the mechanical behavior of transition composite connections.

• 한국구조물진단유지관리공학회 논문집
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• 제25권6호
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• pp.121-130
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• 2021

최근 국내 소규모취약시설은 시설물의 노후화가 가속되고, 다양한 안전사고 발생 및 이용빈도 증가 등에 따라 안전 및 유지관리에 대한 새로운 접근과 인식의 필요성이 제기되고 있다. 특히 대부분의 사회복지시설을 포함하는 소규모취약시설은 안전취약계층의 다수가 이용하는 시설로 안전관리의 중요성이 매우 높다. 이에 본 연구에서는 국내 소규모취약시설을 대상으로 최근 13년간(2008년~2020년) 수행한 안전점검 결과(총 31,114개소)를 토대로 다양한 현황을 조사하였고, 데이터기반의 분야별 특성과 안전 및 유지관리에 관한 성과수준을 평가하였다. 이는 향후 국내 소규모취약시설의 안전기준 개선, 유지관리 전략 등 기초자료로 활용하고자 하며, 취약계층 대상 이용시설의 안전관리 강화에 대한 정책적 방향성을 제시하고자 한다.

• 한국정보통신학회논문지
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• 제22권11호
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• pp.1544-1553
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• 2018

최근 산업 보안 정책에도 불구하고 기업의 내부 정보 유출이 심각하게 증가하여 산업별로 정보 유출 방지 대책을 수립하는 것이 필수적이다. 대부분의 정보 유출은 외부 공격이 아닌 내부자에 의해 이루어지고 있다. 본 논문에서는 이동식 저장매체 및 네트워크를 통한 기밀 파일 유출방지를 위한 실시간 내부 정보 유출 방지 시스템을 구현하였다. 또한, 기업 내의 정보 로그 데이터의 저장 및 분석을 위해 Hadoop 기반 사용자 행동 분석 및 통계시스템을 설계 및 구현하였다. 제안한 시스템은 HDFS에 대량의 데이터를 저장하고 RHive를 사용하여 데이터 처리 기능을 개선함으로써 관리자가 기밀 파일 유출 시도를 인식하고 분석할 수 있도록 하였다. 구현한 시스템은 이동식 데이터 매체와 네트워크를 통해 기업 내부로의 기밀 파일 유출로 인한 피해를 줄이는 데 기여할 수 있을 것으로 사료된다.