• Annual Conference of KIPS
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• 2013.11a
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• pp.821-823
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• 2013

무선충전기술은 개인별로 사용하는 모바일기기가 늘어나 충전에 따른 문제로 필요성이 대두되면서 무선충전의 세계 시장은 매년 80%이상 성장할 것으로 예상된다. 무선충전기술은 크게 전자파가 근거리 자기장을 통해 하나의 매체에서 다른 매체로 이동하는 기술인 자기공진방식과 수 mm내외로 인접한 두 개의 코일에 유도전류를 일으켜 배터리를 충전하는 방식인 자기유도방식으로 나뉜다. 현재는 모바일 기기시장에서 무선충전기술에 대한 성장이 이루어지고, 자동차의 경우도 전기자동차의 보급과 맞물려 시장에 보급될 것으로 보여 무선전력전송기술은 미래가 기대되는 기술이라고 볼 수 있다. 이러한 시점에서 무선충전이 적용된 다양한 환경에서 발생할 수 있는 보안 위협 요소를 도출하고자 한다.

• Investigative Magnetic Resonance Imaging
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• v.13 no.2
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• pp.177-182
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• 2009

Purpose : To compare the subchondral fracture on plain radiography and MR image as a method for assessing osteonecrosis in Legg-Calve-Perthes(LCP) pateients. Materials and methods: We retrospetively reviewed 15 hip joint MR images and plain radiography which visualized subchondral fracture. With basis of the Salter-Thompson classification, extent of necrosis was graded group A to B, as follows; Group A = < 50%, B = > 50%. On PACS workstation, necrotic area of each MR image was measured to calculate the volume of necrotic portion: volume = necrotic area $\times$ slice thickness. Necrotic areas on MR images were graded group A to B and results were compared with that measured in Salter-Thompson classification. On follow up, bone resorption was measured and the extent was compared with subchondral fracture representing necrotic area and that on MR volume method respectively. Results : In 9 joints of 15 hip joints (60%), the degree of necrosis in Salter-Thompson classification on plain radiographs was different from that on MR volume method. Based on plain radiographs by Salter-Thompson classification, the degree of necrosis was overestimated in 6(67%) joints, and underestimated in 3(33%) joints compared with MR volume method. On follow up study, bone resorption was not correlated with necrotic extent of subchondral fracture and MR volume method. Conclusion : The extent of femoral head necrosis measured by subchondral fracture was different from that measured by MR and was not correlated with bone resorption on follow up. Therefore, usefulness of subchondral fracture as a prognostic factor may be limited.

• Investigative Magnetic Resonance Imaging
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• v.8 no.1
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• pp.17-23
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• 2004

Purpose : To evaluate changes in total cerebral blood flow (tCBF) with aging, parenchymal volume changes and vascular abnormalities, using 2 dimensional (D) phase-contrast magnetic resonance imaging (PC MRI). Materials and Methods : Routine brain MRI including T2 weighted image, time-of-flight (TOF) MR Angiography (MRA) and 2D PC MRI were performed in 73 individuals, including 12 volunteers. Normal subjects (12 volunteers, and 21 individuals with normal MRI and normal MRA) were classified into groups according to age (18-29, 30-49 and 50-66 years). For the group with abnormalities in brain MRIs, cerebral parenchymal volume changes were scored according to the T2 weighted images, and atherosclerotic changes were scored according to the MRA findings. Abnormal groups were classified into 4 groups: (i) mild reduction in volume, (ii) marked reduction in volume by parenchymal volume and atherosclerotic changes, and (iii) increased volume and (iv) Moya-moya disease. Volumetric flow was measured at the internal carotid artery (ICA) and vertebral artery bilaterally using the velocity-flow diagrams from PC MRI, and combined 4 vessel flows and tCBF were compared among all the groups. Results : The age-specific distribution of tCBFs in normal subjects were as follows: $12.0{\pm}2.1ml/sec$ in 18-29 years group, $11.8{\pm}1.9ml/sec$ in 30-49 years group, $10.9{\pm}2.2ml/sec$ in 50-66 years group. The distribution of tCBFs in the different subsets of the abnormal population were as follows: $9.5{\pm}2.5ml/sec$ in the group with mild reduction in volume, $7.6{\pm}2.0ml/sec$ in the group with marked reduction in volume, and $7.3{\pm}1.2ml/sec$ and $7.0{\pm}1.1ml/sec$ in the increased parenchymal volume and Moya-moya disease groups respectively. Conclusion : Total cerebral blood flow decreases with increasing age with a concomitant reduction in parenchymal volumes and increasing atherosclerotic changes. It is also reduced in the presence of increased parenchymal volume and Moya-moya disease.2D PC MRI can be used as a tool to evaluate tCBF with aging and in the presence of various conditions that can affect parenchymal volume and cerebral vasculature.

• The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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• v.14 no.1
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• pp.22-40
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• 2009

Detailed bathymetry and magnetic survey data for NW Rota-1 and Esmeralda Bank obtained by R/V Onnuri of Korea Ocean Research & Development Institute in September 2007 were analyzed to investigate bathymetry and magnetic characteristics of the study area and to estimate the locations of possible hydrothermal vents. The shape of NW Rota-1 is corn type, and the depth of the summit is about 500 meter b.s.l. NW Rota-1 shows irregular topographic expression in the southeastern part. The shape of Esmeralda Bank is caldera type opened in the western part. The summit is very shallow, about 50 meter b.s.l. The western part of Esmeralda Bank is more steeper and topographic irregular than the eastern part, and have the valley made by erosion or collapse. The magnetic anomaly patterns of NW Rota-1 and Esmeralda Bank show low anomalies over the north and high anomalies over the south. The magnetic anomalies are steep over the summits and gently smooth over the deep bottom. The low magnetization zone occurs over the summit of NW Rota-1 and is surrounded by the high zones correlated with its crater. Two low magnetization zones are located in the summit and westside of Esmeralda Bank. The low magnetization zones of the summits of NW Rota-1 and Esmeralda Bank suggest the possible existence of hydrothermal vent.

• The Journal of the Korea Contents Association
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• v.20 no.4
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• pp.648-657
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• 2020

This study is a descriptive investigation into the relationship between the degree of the reality shock and the self-efficacy, social support, and ego-resilience of nursing students and the factors that influence their reality shock. The study shows that self-efficacy, social support, and ego-resilience are related with reality shock. The regression analysis shows that self-efficacy, social support, and ego-resilience account for 27.1% of the reality shock. The research results verify self-efficacy, social support, and ego-resilience as factors that influence reality shock. So, it is necessary to develop programs and explore support plans that take into account self-efficacy, social support, and ego-resilience with the aim of relieving the nursing students reality shock. Looking ahead, further studies need to be conducted with expanded objects of investigation with the aim of drawing more attention to the reality shock of nursing students and generalizing research results.

• Journal of the Korean earth science society
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• v.30 no.7
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• pp.824-833
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• 2009

We analyzed a total of six months of geomagnetic data obtained at Cheonyang observatory, which is operated by Korean Meteorological Administration, to monitor earthquake precursors. Geomagnetic transfer functions (GTFs) and polarization values, which reflect the time-variations of the resistivity of subsurface, were estimated from 3-component geomagnetic data. The time-variant fluctuations were compared with the earthquake events occurred in the same period. Now that the daily GTFs show fairly irregular variations, we can not identify any correlation with the already occurred earthquakes and Kp index. On the other hand, we detect clear increases of the Ultra-Low-Frequency (ULF) band polarization values before the earthquakes, but the similar features are also observed even though the earthquake did not occur. This result may indicate that these time-variations are not just due to the earthquake precursor. For further understanding about these results, we need to investigate the relationship between the previous earthquake events and the geomagnetic data of other observatories.

• Journal of the Korean earth science society
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• v.25 no.7
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• pp.604-614
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• 2004

Using three-components geomagnetic data from a permanent geomagnetic observatory in Icheon, we have computed the power spectrum of each geomagnetic component, amplitude, phase and estimation error of transfer function for each day in the 6 months period July 2002${\sim}$December 2002. The temporal variation of power spectrum have random appearances with repeating relative strong and weak magnitude, which is considered as solar activities. However, there is no clear long-term trend. In the case of amplitude, phase and error of transfer function, even though there are some random patterns over the periods of 1000 s and under 100 s, they seem to be comparatively stable without manifest temporal changes. Futhermore, we have estimated electrical field by assuming P$_{1}\;^{0}$ spherical harmonics and then calculated the approximated apparent resistivity for each day. As a result, the variations of resistivity depend on the temporal magnitude of spectral power in horizontal magnetic fields rather than hydrological changes in near surface.

• Proceedings of the KIEE Conference
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• 2007.11c
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• pp.59-69
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• 2007

본 연구는 산업체 임직원 및 오산대학 교수들이 학생들에게 우선 요구하는 직업기초역량이 무엇이고, 우리나라 대학들에서는 이러한 직업기초역량을 향상시키기 위해 어떤 노력을 기울이고 있는지를 파악하여, 향후 오산대학 재학생의 직업기초역량 향상 방안을 모색, 이를 대학의 정책에 반영하고자 수행되었다. 이를 위해 정승환(2005)이 개발한 직업기초능력 진단지를 연구의 목적에 맞게 수정하여 각 학과에 협조문과 함께 배포하여 이를 회수하였다. 그리하여 설문에 응한 총 292명의 산업체 임직원 및 51명의 교수들 자료를 최종 분석하였다. 한편, 우리나라 대학들에서 재학생의 직업기초역량 향상을 위해 어떤 노력을 하고 있는지를 문헌 등을 통해 분석하였다. 조사결과, 첫째, 각 직업기초역량별 하위 항목들에 대한 중요도 대비 현재수준을 통해 개발이 요구되는 직업기초역량을 산업체 임직원들의 담당업무별로 알아본 결과, 사무 관리직은 '자기개발 관리능력', '문제해결능력', 그리고 영업서비스직은 '문제해결능력', '자기개발 관리능력'을, 기술 생산직도 '문제해결능력', '자기개발 관리능력'을 기타 업무의 경우도 '문제해결능력', '자기개발 관리능력'을 부족한 역량으로 꼽았다. 둘째, 교수들이 속한 학과의 계열별로 볼 때, 공학계열은 '기획능력', '자기개발 관리능력', '문제해결능력', '비즈니스 예절'을 그리고 인문사회계열은 '자기개발 관리능력', '기획능력', '문제해결능력', '비즈니스예절', '직업윤리'를, 기타 계열은 '문제해결능력', '기획능력', '직업윤리', 자기개발 관리능력', '정보능력'의 순으로 부족한 역량으로 꼽았다. 이상의 결과를 토대로 오산대학 각 계열 재학생들에게 우선 요구되는 직업기초역량 둥에 대해 논의하였다.

• The Journal of the Korea Contents Association
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• v.9 no.5
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• pp.182-188
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• 2009

The purpose of this study was to investigate the effect of self-care training based on ICF(International Classification of functioning, Disability and Health) on functional independence in the young children with spastic cerebral palsy. Total of 43 young children(male=25, female=18; age range from 36month to 72month) with spastic cerebral palsy, classified at GMFCS(Gross Motor Function Classification System) levels III-IV. Total of 32sessions of a self-care training (eating, grooming, bathing, toileting) were given 4 times a week for 30minutes from August 1th to September 30th of 2008. Changes in the functional independence after the training obtained by Wee-FIM(Functional Independence Measure for Children). Results were as follows: Functional independence was significantly increased after the training. As a result, a self-care training should be applied as an effective intervention to improve the functional independence in the young children with spastic cerebral palsy.

• The Journal of the Korea Contents Association
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• v.14 no.7
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• pp.291-301
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• 2014

This study is a descriptive research of investigating the correlation between new nurses' nursing performance, emotional intelligence, self-resiliency and core self-evaluation. The subjects were 114 new nurses working for less than 12 months at two different hospitals with over 800 beds located in Gyeonggi-do. Between July and November, this study collected the data measured by using a structured questionnaire survey for nursing performance, emotional intelligence, self-resiliency and core self-evaluation. As a result, it was found that there was a difference in the degree of nursing performance according to new nurses' education level, job satisfaction, and working position task satisfaction, and that the higher the emotional intelligence, self-resiliency and core self-evaluation were, the better the nursing performance was. As for emotional intelligence, education level, core self-evaluation and job satisfaction, it was found that they were variables to well predict the degree of nursing performance, and explained 33% of variance in nursing performance. Accordingly, it is necessary to provide actual field-adaptive training education including emotional intelligence and core self-evaluation other than nursing performance from new nurses' orientation in consideration of education degree and job satisfaction.