• 전자공학회논문지SC
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• 제37권1호
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• pp.10-18
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• 2000

본 논문에서는 2축 서보시스템에 적용하기 위한 새로운 윤곽 모델링을 이용하여 퍼지논리형 상호결합제어기를 제안한다. 일반적인 각 축 독립제어기는 각 축의 동적 변수와 루프 이득의 불일치로 인해 윤곽 성능을 감소시킨다. 실제적으로 이러한 시스템은 많은 불확실성도 보유하고 있다. 상호결합제어기는 정확한 윤곽을 구하기 위해 모든 축의 위치 오차 정보를 동시에 이용한다. 그러나 일반적인 상호결합제어기는 마찰, 백래쉬 그리고 매개변수 변화를 극복하지 못한다. 또한 정확한 다축 시스템의 수학적 모델을 얻기 힘들기 때문에 서보시스템의 퍼지논리형 상호결합제어기를 제안한다. 이와 더불어 새로운 윤곽 오차 벡터 계산법을 제시한다. 제안한 알고리즘의 성능을 검증하기 위해 실험결과를 나타낸다.

• 대한치과교정학회지
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• 제19권1호
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• pp.245-256
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• 1989

Translational movement along an arch wire requires sufficient force to overcome frictional forces between bracket and arch wire. The orthodontist must appreciate the importance of friction in this process, and study out the influencing factors on the level of friction. The purpose of this study was to evaluate the effect of artificial saliva on frictional resistances generated between the bracket and arch wire. Independent variables of this study were arch wire material, angulation and environment. Static frictional forces of cobalt-chromium, heat-treated cobalt-chromium, beta-titanium, stainless steel wires were measured under non-angulated dry, angulated dry, non-angulated saliva, angulated saliva conditions. The results were as follows: 1. Stainless steel wires showed lower friction values in non-angulated dry condition, and heat-treated cobalt-chromium wires showed higher friction values in angulated dry condition. Higher friction values were showed in order of cobalt-chromium. stainless steel, heat-treated cobalt-chromium and beta-titanium wires in non-angulated saliva condition. and were showed in order of stainless steel, cobalt-chromium, heat-treated cobalt-chromium, beta-titanium wires in angulated saliva condition. 2. Angulation increased friction for stainless steel wires under dry condition. 3. Artificial saliva decreased friction for cobalt-chromium wires and increased friction for stainless steel wires under non-angulated condition. 4. Artificial saliva decreased friction for all wires except beta-titanium wires under angulated condition. 5. Regardless of angulation or environment. heat-treated cobalt-chromium and beta-titanium wires showed higher friction values, and stainless steel wires showed lower friction values.

• 한국사회복지학
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• 제64권2호
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• pp.299-323
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• 2012

본 연구의 목적은 생애사 연구를 통해 장애인의 사회적 배제 경험을 이해하는 데 있다. 이에 지체와 뇌병변 장애인 10명의 사회적 배제 경험을 중심으로 심층 면접하여 그 내용을 분석하였다. 그 결과는 참여 장애인들은 교육, 노동, 사회참여, 정보, 사회서비스, 공간, 건강관리 등의 다차원적인 사회적 배제에 직면해 있는 주변인으로 시민권적 권리가 부재한 삶을 지내왔다. 이러한 배제로 인해 사회적 관계가 단절되고 해체되었으며, 그들의 정체성 또한 규범화된 사회적 관념에 의해 타율적인 방식으로 정형화되어 갔다. 또한 장애와 빈곤이 복합적으로 결합된 참여 장애인들의 삶 가운데 이들 세대의 인식과 가치에 영향을 미친 역사적 경험들이 제시되었다. 한편 사회적으로 배제된 이들의 삶의 의미는 스스로 평가하고 해석하는 원천에 따라 새롭게 구성되는 것으로 나타났다. 이러한 연구결과를 토대로 장애인의 사회적 배제 극복을 위한 정책적 실천적 함의를 제시하였다.

• Journal of Dental Anesthesia and Pain Medicine
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• 제19권6호
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• pp.361-367
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• 2019

Background: Although studies on dental fear in relation to sex and age have been conducted, there have been few nationwide studies particularly on the youth sector. In addition, no validity and reliability verifications have been implemented for new research groups on the Korean version of the Dental Fear Survey (K-DFS). Therefore, this study aimed to apply the K-DFS developed in a previous study on Korean youth to draw conclusions on dental fear among the youth. Methods: This study used the K-DFS, a Korean translation of Kleinknecht's Dental Fear Survey for elementary school, middle school, and high school students. This study selected 2,161 young people of various ages as participants and increased the validity of the research results by expanding nationwide the scope of the study area. Results: Differences in fear levels according to sex were higher in boys fear behavior scores than in girls' regarding dental treatment (P < 0.05). Students with dental fear had higher scores on items associated with dental treatment and fear of dental stimuli compared with students without dental fear (P < 0.05). Differences were observed among the three groups (P < 0.05). However, the results of logistic regression analysis showed no statistically significant differences for dental visits based on sex, grade, and other subcomponents (P > 0.05). Conclusion: By verifying the validity of the newly developed K-DFS, this research confirmed its utility as a dental fear questionnaire. Therefore, there can be no objection that the grounds for criticism have been established according to conventional wisdom. In the future, however, developing and studying the limits of K-DFS that overcome the factors of dental fear, especially pain, will help reduce dental fear in adolescents.

• 한국지역사회생활과학회지
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• 제15권3호
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• pp.121-135
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• 2004

'Long-life' which has been the perennial interest to human beings also carries the risk of multiple losses such as the death of the family members and friends, the loss of physical and cognitive functions. In that regards, living a long life to be the 'oldest-old' could mean not only a 'symbol of successful aging' but also a hardship and low quality of life at the same time. Therefore, the issue of the quality of life of the oldest old has been the subject of the much of the public and research concern in recent days. While there has been increased awareness about the importance of the subjective aspects of the quality of life and meanings attached to the extended life, most researches on the quality of life of the oldest-old have focused only on the objective conditions of the quality of life such as health, economic status and housing conditions. To overcome these limitations this study aims to explore the subject meaning of 'living a long life' in Korean society by investigating centenarians and their caregivers' interpretations of aging experiences. Qualitative data were gathered from the forty-nine Korean centenarians and their caregivers through in-depth interview. Each interview was tape-recorded and transcribed verbatim. Researchers read each transcript a number of times to get some emerging themes. Most striking result was the fact that most of the centenarians express the 'guilty feelings' and try to offer the 'excuses' about their long life. This results were quite contrary to the results of the studies, done in Japan and western countries like Sweden, United States and Germany, where most of the oldest-old express quite positive interpretations about their long-life and take pride in their longevity. Lack of social support, cohort characteristics of the Korean oldest-old and the cultural interpretations linking the death of children to the long life of older generation are given as possible factors to these unique findings of Korean study. The policy implications of the results are discussed.

• 환경영향평가
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• 제27권2호
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• pp.105-113
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• 2018

소음의 영향권을 파악하기 위해 사용하는 실측/측정망 자료의 한계점, 소음의 전달특성, 장애물들의 영향 등을 보완하기 위해 소음지도 모델링 방법을 최근에 많이 사용하고 있다. 소음지도 모델링 방법은 소음원의 입력, 예측인자의 설정방법, 예측 소음도들의 분석방법에 따라 결과값에 많은 영향을 미친다. 2개 지역에서 공동주택의 노출소음도 산정을 위한 수음점 설정방법과 노출인구 산정을 위한 대표소음도 산정방법에 따라 총 5가지로 나누어 소음 노출인구 산정 결과를 비교 분석하였다. 분석 결과 소음도 구간별 노출인구수를 비교해보니 두 지역 모두 실제와 가장 유사하게 모델링한 기준 방법(Base)과 비교하여 대표소음도를 최고소음도로, 베란다측 노출만을 고려하여 간략화한 방법(M2-1)이 가장 유사한 결과를 나타냈다. 또한, 대표소음도를 최고소음도로, 일정간격 노출로 간략화한 방법(M1-1)은 과대평가, 평균 소음도를 사용한 방법(M1-2, M2-2)은 과소평가될 가능성이 있는 것으로 나타났다.

• 한국재난관리표준학회지
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• 제1권2호
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• pp.61-66
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• 2008

국토의 70% 이상이 산지로 구성되어 있어서 도로와 철도 건설을 위해 절토사면이 필연적으로 발생한다 우기, 동절기 서리로 인한 지반융기, 그리고 해빙은 암석 탈락과 사면붕괴의 원인이 되며 매년 사면붕괴에 의한 차량파손과 인명피해가 증가하고 있다. 인명과 재산을 보호하기 위해 사연붕괴를 조기에 탐지할 수 있는 실시간 모니터링 시스템이 필요하다. GMG사에서 개발한 병진 회전 침하(TRS) 센서를 사면 내에 설치하여 실시간으로 사면을 모니터링을 할 수 있도록 했으나, 시스템의 데이터 획득체계가 취약하여 순간적인 낙뢰에 의해 전체 시스템이 손상될 수 있다. 따라서 저자들은 USN(Ubiquitous Sensor Network)을 제시하여 낙뢰에 의한 손상을 최소화시키고 신뢰도 높은 사면 변형 모니터링 체계를 구축했다.

• 보건행정학회지
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• 제27권4호
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• pp.284-295
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• 2017

Background: The objectives of this study were to identify the reasons of quitting smoking, to determine the factors that make it difficult or helpful to maintain smoking cessation and to confirm the changes after the smoking cessation. Methods: This study was conducted an in-depth interview with people who participated in the smoking cessation treatment program. There were 10 participants and they were interviewed thoroughly for 14 times. Using the directed content analysis, we analyzed the transcript which was written by recording the interview and the researchers' note. Results: The results of this study are summarized as 'the experience while at the verge of smoking cessation and stepping over the verge of smoking cessation,' 'the changing experience due to smoking cessation,' and 'maintaining the changes through overcoming re-smoking.' The smoking cessation treatment program induced the smokers to quit smoking. Participants mentioned drinking alcohol was the major obstacle to maintain smoking cessation. Also, they noted that the money and the time that were already spent to quit smoking helped their smoking cessation as well as the social relations which helped to prevent re-smoking. Participants felt well-cared through the smoking cessation treatment program and that it helped them to maintain smoking cessation. Conclusion: Smoking cessation treatment program has a positive effect on the smoking cessation trial and maintenance. In order for smokers to overcome re-smoking, educations regarding drinking problem, formation of supportive social relationship, and the applications for smoking cessation will be beneficial.

• Molecules and Cells
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• 제41권4호
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• pp.362-372
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• 2018

High mobility group box 2 (HMGB2) is an abundant, chromatin-associated, non-histone protein involved in transcription, chromatin remodeling, and recombination. Recently, the HMGB2 gene was found to be significantly downregulated during senescence and shown to regulate the expression of senescent-associated secretory proteins. Here, we demonstrate that HMGB2 transcription is repressed by p21 during radiation-induced senescence through the ATM-p53-p21 DNA damage signaling cascade. The loss of p21 abolished the downregulation of HMGB2 caused by ionizing radiation, and the conditional induction of p21 was sufficient to repress the transcription of HMGB2. We also showed that the p21 protein binds to the HMGB2 promoter region, leading to sequestration of RNA polymerase and transcription factors E2F1, Sp1, and p300. In contrast, NF-Y, a CCAAT box-binding protein complex, is required for the expression of HMGB2, but NF-Y binding to the HMGB2 promoter was unaffected by either radiation or p21 induction. A proximity ligation assay results confirmed that the chromosome binding of E2F1 and Sp1 was inhibited by p21 induction. As HMGB2 have been shown to regulate premature senescence by IR, targeting the p21-mediated repression of HMGB2 could be a strategy to overcome the detrimental effects of radiation-induced senescence.

• 경영정보학연구
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• 제7권2호
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• pp.163-181
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• 2005

본 연구에서는 MRO e마켓의 성공 요소를 엔투비(주)의 사례를 바탕으로 제시하였다. e마켓의 성공요소를 초기 유동성, 공급자 참여, 구매자 참여, 중개자 가치 기여로 분류하고 이를 바탕으로 비즈니스 모델의 실천적 요소를 엔투비의 창업부터 성장 과정의 분석을 통하여 정리하였다. 본 연구의 특징은 성공적인 e마켓 구현을 위한 실천적 변화관리 요소를 장애 요인 및 비즈니스 모델 관점에서 제시한데 있다. 비즈니스 모델 구성 요소, 가치 구조, 전자 카탈로그 등을 상세히 제시하였고 MRO e마켓활용을 통한 고객사의 성과 개선은 사용자 직접구매(Desktop Purchasing) 및 전자조달 프로세스를 통한 계량적 직간접 비용 절감 효과를 예시하였다. 본 연구의 공헌은 e마켓의 이론 대비 상대적으로 부족한 실천적 연구의 간격을 좁힌데 있으며 본 사례 연구를 통하여 제시된 시사점은 MRO e마켓의 성공적 구현을 위한 향후 연구에 활용될 수 있다.