• 대한전자공학회논문지TC
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• 제47권4호
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• pp.38-42
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• 2010

본 논문에서는 슬롯형 분할 나선형 공진기를 이용하여 마이크로스트립 기판상에 구현될 소형 협 대역통과 필터설계기법을 제안한다. 이 필터의 설계기법은 슬롯형 분할 나선형 공진기, 패치사이의 용량성 갭, 그리고 미앤더 구조를 가진 유도성 스터브의 조합으로 구성된 필터 단들의 종속 연결에 근거를 두고 있다. 그 기법하에서 거의 대칭인 필터응답, 가변 대역폭, 그리고 소형필터를 구현할 수 있었다. 제안된 필터는 기존의 필터보다 저지대역에서 우수한 차단특성을 가졌다. 측정결과, 삽입손실은 중심주파수($f_0$=1GHz)에서 -3.47dB, 통과대역에서 -12.62dB 이하, 3dB 대역폭은 약 7.3%로 나타났다. 제작된 필터의 관심 영역 주파수응답은 CST사의 MWS(Microwave Studio)로 전산모의 실험된 값과 잘 일치되었다.

• 대한치과기공학회지
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• 제30권1호
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• pp.97-107
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• 2008

Objectives; The purpose of the present study is to investigate the difference in levels of satisfaction between dental laboratory owners and employed dental technicians in the area of dental laboratory management. Methods; The samples of seventy-one dental laboratory owners and sixty-six employed dental technicians were selected in a blinded and random manner. Data was collected through self-administered questionnaires and analyzed using average values, the t-test and multiple regression. Results; 1) There was no significant difference in the average values of general satisfaction levels related to dental laboratory management between dental lab owners and employees. 2) The average values of satisfaction levels in 11 specific items scored 'above average' among dental lab owners and 'average' among employees. 3) The average values of satisfaction levels in 10 specific items except for 'trust and respect' showed a significant difference between dental lab owners and employees. 4) Important factors which influenced the satisfaction level of dental lab owners were 'trust and respect' and 'improvement of employee's benefits'. In the employees group, 'trust and respect', 'improvement of employee's benefits' and 'technical information support' were important factors. Conclusion; The present study revealed that dental laboratory owners and employees have some gaps between the viewpoints in dental laboratory management. This suggests the necessity to improve management in a transparent and economical way. However this study has some limitation in that the sample size was not massive enough.

• 가정과삶의질연구
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• 제31권5호
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• pp.143-157
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• 2013

This study used a qualitative research method to comprehensively deal with child care training in depth with the following content: the goals of child care teachers preparing for practical training; how they perform and feel about their roles throughout the training period as child care teachers; and their evaluation after the training period. A total of 10 people participated in the research and the training activities of child care teachers were qualitatively explored based on the results. The research findings are as follows. First, child care teachers have expectations for prospective teachers and take time for self-evaluation while preparing for teaching. Also, child care teachers set a goal of helping prospective teachers develop into outstanding teachers and have expectations for it. Second, child care teachers evaluate prospective teachers by treating them as colleagues while teaching them. Furthermore, child care teachers consider themselves as educators who train and produce child care professionals. Prospective teachers define their roles as assistants and learners in the actual educational scene. In addition, child care teachers feel a sense of pride by performing as hands-on training teachers. At the same time, they reflect on themselves by evaluating their duties as educators in their relationships with prospective teachers. Third, child care teachers suggested the need for changing the training system for themselves and prospective teachers after training. In addition, they argued that the gaps between school education and the actual educational scene should be reduced through solid training for acquiring new knowledge and information in both places in accordance with the rapidly-changing child care environment. Finally, the suggested the necessity of establishing a standard training curriculum and educational programs within their institution.

• 대한전자공학회논문지TC
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• 제48권12호
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• pp.35-41
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• 2011

본 논문에서는 손실매질의 다층구조로 이루어진 마이크로 스트립선로의 손실특성의 개선을 위한 새로운 구조를 제안한다. MIS 구조로 된 전송선로의 Si와 SiO2층 사이에 0전위를 가진 도체를 일정한 간격의 주기적인 배열로 고안된 새로운 모델의 MIS구조에 대한 유한차분법을 이용한 해석방법이 사용된다. 특히 전송선로에 대한 유전체의 영향을 줄이기 위하여 0전위를 가진 주기적인 결합의 도체로 이루어진 구조가 시간영역의 신호를 통해 시험된다. 다양한 0전위 도체의 간격(갭)에 따른 주파수 의존적인 추출된 전송선로 파라미터와 등가회로 파라미터가 주파수 함수로서 나타내진다. 또한 본 논문에서 고안된 구조에 대해 특성임피던스와 유효유전상수의 큰 변화 없이 대칭 결합선로의 quality factor가 개선됨을 볼 수 있다.

• Animal cells and systems
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• 제6권1호
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• pp.13-18
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• 2002

Phylogenetic relationships of Korean Acidiella species were tested using mitochondrial 16S ribosomal RNA gene sequences. We used 16 published sequences as outgroup, and 10 new sequences for nine Korean Acidiella species as ingroup. The number of aligned sites was 1,281 bp, but 1,135 bp were used for the analysis after excluding sites with missing data or gaps. Among these 1,135 sites, 464 sites were variable and 340 were informative for parsimony analysis. Phylogenetic information was extracted from this data set using neighbor-joining, maximum likelihood and maximum parsimony methods and compared to a morphology-based phylogenetic hypothesis. Our molecular data suggest that: (1) the tribe Trypetini appears to be monophyletic even when the nine additional Acidiella species are added to our previous phylogenetic analysis; (2) all the Korean Acidiella species belong to the Trypeta group, but the genus Acidiella is not supported as monophyletic; (3) the close relationship of A. circumvaga, A. issikii, and A. sapporensis is supported; (4) the close relationship of A. pachypogon and two additional new Acidiella species is strongly supported; and (5) the possible presence of two or more cryptic species among the specimens previously identified as A. obscuripennis is suggested. Sequence data from the mitochondrial 16S rDNA allowed us to better understand the systematic status of Korean Acidiella species. They indicated that the current concept about the genus Acidiella is insufficient and needs to be refined further. This study also showed a few interesting relationships, that had not been recognized by morphological study alone. Based on this study, we were able to plan further experiments to analyze relationships within the Trypeta Group.

• 한국식품조리과학회지
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• 제31권2호
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• pp.162-174
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• 2015

The purpose of this study was to evaluate the current status of dietary habits and dietary life competency of elementary school parents, who are influential to the dietary life of their children and family. A survey was conducted with 362 elementary school parents living in Seoul and Gyeonggi province by using a self-administered questionnaire consisting of 53 questions on dietary habits, dietary life competency, home cooking frequency, and dietary education needs. The results were as follows: The scores of dietary habits and dietary life competency were 76.35 and 74.51 out of 100, respectively, suggesting a need for improvement. Parents with higher monthly income, demonstrated higher scores of both dietary habits and dietary life competency (p<0.001). As expected, female parents showed higher scores of dietary life competency than male parents (p<0.01). there was also a close relationship between the scores of dietary habits and dietary life competency (r=0.58). The parents with high scores for dietary habits and dietary life competency showed a significantly higher frequency of home cooking (p<0.001) compared to medium- or low-scored parents. Most parents answered that dietary education need to be started earlier, and that their main source of dietary life information was mass media. They also showed a preference for real experience and practice for dietary education. The above results showed that there is a close relationship between dietary habits and dietary life competency, and suggest that continuous education is necessary to improve the dietary habits and dietary life competency of elementary school parents. Because monthly income appeared to be the most influential socioeconomic factor for the parents' dietary habits and dietary life competency, continuous efforts on dietary education are necessary to reduce the score gaps in these categories.

• Journal of Forest and Environmental Science
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• 제32권2호
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• pp.164-172
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• 2016

This study examined the recognition differences between local residents and national park managers on the adjustment of national parks which are conducted every ten years for the purpose of providing basic information for the park management, according to the Natural Parks Act. Both local residents and national park managers positively perceived the adjustment of national parks, but park managers showed concern towards the damage of natural resources resulting from the cancellation and adjustment of restricted development districts in Korean national parks. Local residents are more likely than park managers to recommend boundary adjustment in other national parks regarding the influence of parks adjustment on local change. While local residents recognized that the boundary adjustment of national parks improves the level of community management, park managers focused on damages on the local environment and the park landscape adjacent to the areas. The result shows the recognition differences of local residents and park managers. Further research into adjustment of national parks is necessary to diminish perception gaps among stakeholders and develop prediction indicators of cancellation effect in response to the future cancellation areas of national parks through the characteristics of cancellation communities, revitalization of local economy, and environmental change of local community.

• Archives of Plastic Surgery
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• 제41권5호
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• pp.505-512
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• 2014

Background Laryngeal allotransplantation (LA) is a technique involving transplantation of a deceased donor's larynx into a recipient, and it may be substituted for conventional laryngeal reconstruction. There are widely different views on LA, as the recipient is administered continuous, potentially life-threatening, immunosuppressive therapy for a functional or aesthetic result, which is not directly related to life extension. The purpose of this study was to analyze the difference in risk acceptance and expectations of LA between four population groups. Methods A survey was performed to examine patients' risk acceptance and expectations of LA. The survey included 287 subjects in total (general public, n=100; kidney transplant recipients, n=53; post-laryngectomy patients, n=34; doctors, n=100), using a Korean translated version of the louisville instrument for transplantation (LIFT) questionnaire. Results All four groups responded differently at various levels of their perception in risk acceptance and expectations. The kidney transplant recipients reported the highest risk acceptance and expectations, and the doctor group the lowest. Conclusions This study examined the disparate perception between specific population groups of the risks and benefits of using LA for the promotion of the quality of life. By addressing the information gaps about LA in the different populations that have been highlighted from this survey, we suggest that LA can become a more viable alternative to classical surgery with resultant improved quality of life for patients.

• 대한교통학회지
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• 제26권6호
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• pp.71-80
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• 2008

무통제 교차로(uncontrolled intersection)는 교통신호기나 정지표지, 양보표지 등에 의한 통제가 없으며, 교통량도 많지 않은 교차로이다. 무통제 교차로에서의 간격수락(gap acceptance) 과정은 교차로 안전상, 그리고 흐름상 중요한 문제이다. 본 연구에서는 무통제 교차로 지역의 차량의 행태를 조사하여 간격수락상황을 규명하고, 운전자의 특성을 고려한 간격수락 모델을 개발하여 무통제 교차로에서의 차량 흐름을 파악하고자 한다. 이를 위하여 수 원시 지역의 무통제 교차로의 지역을 현장 조사 및 비디오 조사를 하고 로짓모델로 간격수락모델을 모형화하였다. 그 결과, 무통제 교차로에서 간격수락을 위해 운전자가 기다리는 총시간, 차량의 진행방향이 우회전인 경우, 나이, 성별, 동승자 유무 등이 간격수락에 영향을 미치고 있음을 알 수 있었다. 특히 성별이 남성인 경우, 동승자가 있는 경우, 기다리는 시간이 길수록 수락간격이 더 빠른 특성을 보였다. 이러한 연구 결과는 무통제 교차로를 운행하는 운전자들은 교차로에서 통행의 의사결정을 함에 있어 그러한 운전자, 교통, 동승자조건등의 특성에 영향을 받는 것으로 나타나고 있는바 향후 교차로 설계나 교차로 안전정보제공 등에 사용될 수 있을 것으로 사료된다.

• 한국치위생학회지
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• 제14권2호
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• pp.181-187
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• 2014

Objectives : The purpose of this study is to investigate the effect of oral health education conducted by a dental hygienist in order to provide some information on intensive oral health education to elementary school students. Methods : Subjects were the students of J and M elementary schools in Seoul from October 28 to November 16, 2011. Oral health education was provided by a dental hygienist, and then they took the PHP test again to verify the effect of the oral health education. Results : Concerning changes in PHP scores after the oral health education, the scores of the students dropped from 2.34 in the pretest to 1.85 in the posttest(p<.001). As to changes in PHP scores by grade after the oral health education, the third graders and sixth graders got 2.40 and 1.36, respectively. Regarding satisfaction level with the oral health education, they got 4.07 out of five points. Among the items of satisfaction with the oral health education by grade, there were significant gaps in a change of toothbrushing method(p<.001) and a change of dietary control(p<.001) by grade. Conclusions : The finding of the study showed that both the third and sixth graders had less score in the PHP test and credibility to the effectiveness of the oral health education by the dental hygienist.