• Proceedings of the Korean Vacuum Society Conference
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• 2014.02a
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• pp.434.1-434.1
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• 2014

최근 자성 나노 입자를 이용한 온열치료가 주목을 받고 있다. 자성을 띄는 나노 입자를 암 세포에 보내, 교류 자기장을 걸어주어 회전에 의한 마찰손실로 인한 열을 이용하여 암 조직만을 국소 가열하는 원리이다. 본 실험은 유도 자기장을 사용한 자성 나노 파우더의 가열을 목적으로 시행하였다. 나선형 코일위에 세라믹, 유리 등 절연체 원판 위에 자기장이 발생되도록 휴대용 평판형 자기장 발생장치를 제작하였다. 자기장 발생 장치는 평판형 나선형 코일에 특정 주파수를 가진 전원을 인가하여 자기장을 발생시킨다. 평판형 나선형 코일은 내경 40 mm, 외경 140 mm, 2 mm 동선으로 제작하였다. 제작한 자기장 발생장치를 자기장 측정 센서(Hall sensor 등)을 원판 위에 설치하여 거리별 자기장의 크기를 측정하였다. 자기장은 나선형 코일 위 원판 중심에서 최대로 발생되어 중심에서 멀어질수록 크기가 감소하였다. 자기장 발생장치 위에 자성 나노 파우더($Fe_3O_4$와 $CoFe_2O_4$)를 혼합한 용액 시료를 위치시키고 자기 쌍극자 모멘트와 자기장간의 상호작용을 유도한다. 이때 자성 나노 파우더별로 발생하는 열을 열전쌍(TC)이나 Optical fiber를 사용한 Thermometer로 측정하여 비교분석하였다.

• Investigative Magnetic Resonance Imaging
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• v.13 no.1
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• pp.74-80
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• 2009

Purpose : To evaluate the characteristic MR imaging findings of Langerhans cell histiocytosis (LCH) in the skull and to compare them with those of plain radiography and computed tomography. Materials and Methods : A total of 10 lesions in 9 patients (Age range; 5-42 years, Mean age; 18, all women) with Langerhans cell histiocytosis in the skull were included in our study. Nine lesions in nine patients were histologically confirmed by surgery or fine needle aspiration biopsy. All patients performed with MRI, and plain radiography and CT scan were done in 7 patients (8 lesions). Two experienced neuroradiologists reviewed the radiological examinations independently with attention to location, size, shape and nature of the lesions in the skull and compared the extent and extension of the lesions to adjacent structures. Results : The lesions were distributed in all of the skulls without predilection site. On MRI, the masses were shown as well-enhancing soft tissue masses (10/10) mainly in diploic spaces (8/10) with extension to scalp (9/10) and dura mater (7/10). Dural enhancement (7/10) and thickening (4/10) were seen. The largest diameter of the soft tissue masses ranged 1.1 cm to 6.8 cm, shaped as round (5/10) or oval (5/10). On CT scans, the lesions were presented as soft tissue masses involving diploic space (6/8) and scalp extension (7/8) were also well visualized. Although bony erosion or destruction was more clearly seen on CT rather than those of MRI, enhancement of soft tissue masses and dura were not well visualized on CT. In contrast, all of the lesions in LCH were seen as punched out (4/8), beveled-edge appearance (4/8) osteolytic masses in plain radiography, but scalp and dural extension could not be seen. Conclusion : Characteristic MR findings in patients with LCH are soft tissue mass in diploic space with extension to dura and scalp, and MRI would be better imaging modality than plain radiography or CT.

• The Journal of the Korea Contents Association
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• v.12 no.5
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• pp.415-430
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• 2012

Under fastly moving businese circumstance, it is very important to retain par excellence human resource and innovation. The purpose of this study is to find out casual relationship among self-efficacy, job embeddedness, innovative behavior, and organizational citizenship behavior, which is dependent variable. With the help of information technology. To verify hypotheses such statistical analyses as factor analysis, reliability test, and path analysis by AMOS 18.0. The population of this study is employees of super deluxe hotels in korea and they are divided into two categories such as front-of-the-house and back-of-the-house respectively with same numbers. In case of mutual relationship between self-efficacy and innovative behavior, self-control and task difficultness factors significantly influence innovative behavior in case of front-of-the house employees and vice-versa in those of back-of-the-house. In case of interactive relationship between self-efficacy and organizational citizenship behavior, slightly different results are revealed between front-and back-of-the-house employees, employees, i.e. all factors are significantly related in former but not in latter.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
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• v.9 no.4
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• pp.135-144
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• 2014

This study has examined how the childcare teachers have been evaluating themselves on system absorption who have been working in the house of the children at the time when the sight of the society has been expanding to the house of the children through the spread of the understanding of the importance of the role and the strengthening of the leadership of the diverse types of the leadership of the childcare teachers in the house of the children, and also this study has observed the main causes affecting such situations. This study has also analyzed the main causes such as the cause of self understanding on job satisfaction of the children's house teachers, the cause of self understanding on the leadership of the principal, demographic characters, and characters related with the place of work affecting the system absorption(Emotional Absorption, Normative absorption, and lasting absorption) with the children's house teachers as the objects working in the area of the City of Seoul. The results of the analysis have showed that job satisfaction, individual consideration, intellectual stimulation, giving motive, age, schooling, type and scale of facility, grade and others have been appeared to have been significantly affecting the self evaluation on system absorption demographically. In other words, the child care teachers have had higher degree of reaction to the system absorption in affirmative direction when they come into contact with the leadership of the principal in raising the intellectual stimulation, providing the motivation, and giving consideration individually, and when they have higher evaluation on the job satisfaction they them selves understand. Based on such results the principal of the house of the children should spread the leadership for the careful operation of the house of the children for the teachers more positively, and what has been required was giving and developing the diverse operation service for the elevation of the job satisfaction of the childcare teachers.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.7
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• pp.396-406
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• 2018

The purpose of this study was to investigate the causal relationship between factors affecting the quality of life (QOL) of call center representatives by applying the PRECEDE model to structural equation modeling. The subjects of the survey were 695 consultants engaged in inbound work at four call centers in D metropolitan city. Data collection was conducted using structured, self-administered questionnaires from November 15th to December 5th, 2016. The results of this study show that the QOL of the reps was significantly negatively correlated with mental health and emotional labor but significantly positively correlated with work environment, self-efficacy, organizational support, and organizational commitment. The results of structural model analysis show that mental health had a negative influence on QOL, whereas work environment and self-efficacy had a positive influence. In addition, emotional labor had a negative effect on mental health, but organizational commitment and work environment had lowered emotional labor level. In addition, organizational support had enhanced employee self-efficacy and organizational commitment, and organizational commitment had mitigated emotional labor. Therefore, it is necessary to implement a health promotion program to improve the QOL of call center reps.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.11
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• pp.7424-7432
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• 2015

The purpose of this study is to find out the effectiveness of four leadership types to employees that affected by leaders of the University-Industry Collaboration Foundation(UICF). This study has analyzed through structural equation modeling(SEM) using AMOS after surveyed for 178 employees out of 404 employees about IUCF of 35 universities in nationwide. In order to examine the power of influence that leadership types of leader how to improve organizational effectiveness on IUCF, leadership types were classified with transformational leadership(TFL), transactional leadership(TAL), coaching leadership(CL) and servant leadership(SL) as independent variables and job satisfaction(JS), organizational commitment(OC) and self efficacy(SE) as a dependent variables. The results are following; first, job satisfaction and organizational commitment were affected by transformational leadership, transactional leadership and coaching leadership. second, self-efficacy was not statistically significant for power of influence that affected by transactional leadership and servant leadership. third, the employees of UICF in connection with self-efficacy were only weak affected by transformational leadership and coaching leadership. fourth, job satisfaction, organizational commitment and self-efficacy as the three dependant variables were not utterly influenced by servant leadership.

• The Proceeding of the Korean Institute of Electromagnetic Engineering and Science
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• v.5 no.3
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• pp.78-87
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• 1994

생물학 및 의학등의 생명과학에서는 현미경을 이용하여 생체물질 즉, 생체조직을 관찰하고 이에 대한 조직의 검사 결과를 판정하고 발표한다. 이때 필히 고정과정(fixation process)을 거쳐야 한 다. 즉, 생체조직중 조직의 구조, 특정 세포나 바이러스 및 효소등을 관찰할 때 고정과정을 거쳐 조직을 절편하고 이를 염색하여 현미경으로 검사하게 된다. 고정과정이란 생체물질을 안정화시키고 자기분해 혹은 부패를 방지하여 보존이 가능하도록 변화시키 는 과정으로, 조직내의 용해성 물질을 불용성 물질로 변형시키는 과정이다. 고정과정을 거친 생체조직 은 구조를 보존하고 있기 때문에 조직의 훼손이 없는 상태에서 절편이 가능하고 또한 염색상태를 좋게 하며 관찰시 contrast를 증진시킨다. 만약 고정과정을 거치지 않으면 물질의 세포막이 파괴되고 단백질 등의 물질이 용해되어 조직의 변형을 일으켜 제대로 조직을 관찰할 수 없게 된다. 고정과정에는 크게 화학적 고정법과 물리적 고정법이 있다. 화학적 고정법은 생체조직을 화학용액에 처리하는 방법이며, 물리적 고정법은 직접적인 열 혹은 초음파등으로 물질을 고정시키는 방법이다. 표 면과 내부의 열전도가 달라져 고정이 균일하게 되지 않는 단점을 가지고 있기 때문에 보통 2~6일의 고 정시간을 요하는 화학적 고정법을 사용하고 있다. 따라서 조직에 대한 총 검사시간이 최소 6일에서 최 대 12일이 요구된다. 병원등에서 조직검사의 결과가 늦게 발표되는 사유는 바로 화학적 고정법을 사용 하여 생체조직을 관찰하고 그 결과를 판정하기 때문이다. 본 고에서는 마이크로파를 이용하여 약 3시간만에 조직의 상태를 관찰할 수 있는 고정법을 소개한다. 마이크로파를 이용하여 조직을 고정하는 고정방법을 기존의 고정법과 비교하여 이들의 장단점을 나타 낸다. 본 연구자에 의해 개발된 마이크로파 고정기를 소개하고, 이를 이용하여 생체물질을 고정한뒤 절 편, 염색하여 현미경 관찰결과를 발표하여 본 연구의 방법이 기존 방법보다 우수함을 나타낸다.

• Korean Journal of Optics and Photonics
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• v.4 no.4
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• pp.464-473
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• 1993

The dynamics of phase grating formation with visible light in an optical fiber is investigated. Adopting a simple two-photon local bleaching model, it is shown that the grating self-organize into an ideal grating, where the writing frequency is always in the center of the local band gap, as it evolves. The evolution at each point in the fiber is described in terms of a universal parameter that reduces the coupled partial differential equations describing the system to ordinary differential equatior~s. These equations are used to prove that there exists a fixed point of the grating growth process that corresponds to a perfectly phase-mached grating.

• The Journal of the Korea Contents Association
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• v.18 no.6
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• pp.113-121
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• 2018

This study discusses the relationships among work-family conflict, workers' individual engagement and self-efficacy. The empirical analysis shows that work-life conflict has a great importance on workers' individual engagement. The results highlight the role of work-family conflict in helping to enhance the workers' individual engagement. This study contributes to the work-family conflict in literature by reporting the findings of empirical research, which examine the attitudes relating work-family conflict. It is identified in the study that the substantial impact of work-family conflict on workers' individual engagement is crucial, and the policy implications for employers suggested.

• The Transactions of the Korean Institute of Power Electronics
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• v.2 no.4
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• pp.45-55
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• 1997

According to the increase of factory-automation in the field of production, the importance of autonomous guided vehicle's(AGV) role is also increased. The study about an active and effective controller which can flexibly prepare for the changeable circumstance is in progressed. For this study, the research about action base system to evolve by itself is also being actively considered. In this paper, we composed an active and effective AGV fuzzy controller to be able to do self-organization. For composing it, we tuned suboptimally membership function using genetic algorithm(GA) and improved the control efficiency by the self-correction and generating the control rules. Self-organizing controlled(S0C) fuzzy controller proposed in the paper is capable of self-organizing by using the characteristics of fuzzy controller and genetic algorithm. It intuitionally controls AGV and easily adapts to the circumstance.