• 대한예방한의학회지
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• 제12권3호
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• pp.35-45
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• 2008

Purpose : To evaluate safety of Sibjeondaebotang and Yugmijihwangtang in rats' fetus Methods : Female Sprague-Dawley rats were orally administered with the Sibjeondaebotang and Yugmijihwangtang at dose of 5mg/kg/day for 20 days. Pregnant rats were sacrificed at 20th day of gestation. Approximately live fetuses in the 20th day of gestation were randomly selected and fixed in 95% ethanol. To observe skeletal malformations, fetuses were stained with alcian blue and alizarin red S. Results : Neonatal body weight and number of fetus of Sibjeondaebotang, Yugmijihwangtang group were increased to those of control group. The fetuses treated with Sibjeondaebotang, Yugmijihwangtang didn't showed external malformation. Vertebral and sternal skeletal variations were observed in Sibjeondaebotang, Yugmijihwangtang administered group, but compared to the control, those skeletal variations were insignificant. There were no significant changes in number of ribs, cervical, thoracic, lumbar, sacral and caudal vertebrae Conclusion : From these results, it can be concluded that Sibjeondaebotang, Yugmijihwangtang shows no toxicity effects on fetus body weight and number of live fetuses. Although skeletal variations were shown in vertebrate and sternum, Sibjeondaebotang, Yugmijihwangtang did not show significant changes in bone malformation.

• 대한예방한의학회지
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• 제13권2호
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• pp.77-87
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• 2009

Purpose : To evaluate the effects of Samultang(SMT) on the metals in the dams and fetuses Method : SMT(Decoction) was administered orally using different concentrations to pregnant Sprague-Dawley rats for 20days after being assigned randomly to 5 groups. Each group has 11 dams. Pregnant rats were sacrificed at the 20th day of gestation and metal concentration in the dams and fetuses was observed using a ICP-MS and mercury analyzer. Results : Hg concentration in the blood of dams was lower in the $SMT{\times}1$, $SMT{\times}2$, $SMT{\times}4$group than VC(Vehicle Control) and Control group. Hg concentration in the organs of dams was lower in the $SMT{\times}1$, $SMT{\times}2$, $SMT{\times}4$ group than VC, Control group. Whereas Cd concentration in the organs of fetuses was getting lower as increasing SMT dose, Hg concentration in the organs of fetuses was getting higher as increasing SMT dose. Discussion and Conclusion : There were not any significant harmful differences of metal concentration in the dams and fetuses treated by SMT. Particularly, SMT showed the possibility of efficacy to reduce the concentration of Hg in dams but to increase the concentration of Hg in fetuses. The mechanism of reduction is not yet proven. A hypothesis says there is a possibility of the chelation effect between the essential elements of herbs and heavy metals. Another hypothesis is the possibility of Hg transmission from dam to fetus. Further study should be conducted to make guidelines for the safe use of herbal medicine.

• Tuberculosis and Respiratory Diseases
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• 제61권5호
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• pp.496-500
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• 2006

신세포암은 원발 부위의 수술적 절제를 하더라도 전이를 자주하는 질환으로 이에 따라 5년간의 추적조사가 권장되고 있다. 본 증례에서는 신세포암으로 신적출술 이후 통상적인 5년간의 추적조사기간동안 전이가 발견되지 않았으나, 7년후 폐렴으로 내원하여 조사중에 발견한 신세포암의 기관지내 전이를 수술적인 방법으로 제거하여서 보고하는 바이다.

• Journal of Electrical Engineering and Technology
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• 제13권5호
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• pp.2059-2066
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• 2018

This study explored the feasibility of utilizing an SWCNT-coated fabric sensor for the development of a wearable motion sensing device. The extent of variation in electric resistance of the sensor material was evaluated by varying the fiber composition of the SWCNT-coated base fabrics, attachment methods, number of layers, and sensor width and length. 32 sensors were fabricated by employing different combinations of these variables. Using a custom-built experimental jig, the amount of voltage change in a fabric sensor as a function of the length was measured as the fabric sensors underwent loading-unloading test with induced strains of 30 %, 40 %, and 50 % at a frequency of 0.5 Hz. First-step analysis revealed the following: characteristics of the strain-voltage curves of the fabric sensors confirmed that 14 out of 32 sensors were evaluated as more suitable for measuring human joint movement, as they yield stable resistance values under tension-release conditions; furthermore, significantly stable resistance values were observed at each level of strain. Secondly, we analyzed the averaged maximum, minimum, and standard deviations at various strain levels. From this analysis, it was determined that the two-layer sensor structure and welding attachment method contributed to the improvement of sensing accuracy.

• 전력전자학회논문지
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• 제10권4호
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• pp.313-322
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• 2005

본 논문은 복공진 인버터를 적용한 250[W] 메탈핼라이드램프를 구동하기 위한 고역률 전자식 안정기를 설계하고 구현하였다. 제안된 전자식 안정기는 역률 개선 회로기능을 갖는 부스트 능동 PFC 회로와 하프 브리지 복공진형 인버터로 구분된 2개의 전력처리단으로 구성되어 있다. 회로 기본동작원리 및 회로 해석은 무차원화 파라미터를 도입하여 범용성을 부여하여 도식적으로 나타내었다. 음향공명을 제거하기 위해 타이머 IC와 구동 IC로 구성된 간단한 주파수 제어기를 구현하였다. 실험을 통해 복공진 인버터를 적용한 고역률 메탈핼라이드램프용 전자식 안정기가 안정적으로 동작함을 확인하였다

• 한국산학기술학회논문지
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• 제12권12호
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• pp.5910-5916
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• 2011

강재는 단면의 종류와 크기 및 부재에 따라 화재에 노출되는 표면적이 달라지며, 이에 따라 화재에 의한 강재의 온도상승도 큰 차이를 나타낸다. 단면형상계수($H_p$/A)는 강재의 종류, 크기, 적용부재 및 내화피복재의 종류 등의 변수에 따라 결정되며, 이것은 내화피복 두께를 결정하는 기준이 된다. 본 연구를 통하여 강재는 종류에 관계없이 단면의 크기가 증가할수록 단면형상계수는 감소하는 것을 알 수 있었다. 단면형상계수에 따른 강재의 종류별 내화피복 두께 산정 결과 1시간 내화성능은 기준보다 소요 두께가 30~50% 낮게 나타났다. 또한, 2시간 내화성능은 기준보다 소요 두께가 최저 27% 낮게 산정되는 부재도 있으나 대체로 기준에 근접하는 것을 알 수 있었다. 그러나 H형강의 경우 3시간 내화성능은 대체로 기준을 만족하지만 각형강관과 원형강관의 경우 5.0~17.5% 정도 기준을 상회하는 값으로 나타났다.

• 정보처리학회논문지B
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• 제18B권1호
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• pp.1-10
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• 2011

가역 워터마킹 기법은 디지털 콘텐츠에 지각적 투명성을 유지하며 워터마크를 삽입한 후, 이를 아무런 손상없이 원본 상태로 복원할 수 있는 메시지 은닉 수단으로서 높은 품질과 높은 삽입용량이 요구되는 분야에서 다양하게 이용되어질 수 있다. 본 논문에서는 차이값 히스토그램 기반의 가역 워터마킹에서 응용분야의 요구에 맞게 높은 삽입용량을 제공하기 위한 효율적인 반복삽입 알고리즘을 제안한다. 제안한 방법에서는 메시지가 삽입된 영상에 대하여 반복삽입할 때, 지역성을 최대한 활용하기 위하여 행열 교차 스캐닝 방법을 이용하였다. 다양한 영상들에 대하여 비교 분석한 실험 결과에 따르면 제안한 알고리즘은 완전한 가역성과 함께 낮은 왜곡을 유지하면서도 효율적인 반복삽입을 통한 높은 삽입용량을 얻을 수 있었다.

• 한국정보처리학회논문지
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• 제4권8호
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• pp.1907-1920
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• 1997

본 논문에서는 새로이 재편될 우편 업무를 위한 통합 모델을 설계하였으며, 설계 단계는 다음과 같이 4단계로 나누어 진행하였다. 첫째, 기존의 우편 업무와 재편될 우편 업무를 수집, 운송, 배달 업무로 구분하여 분석하였고, 둘째, 통합 우면 모델 설계시에 적용할 몇 가지 기준을 개발하였으며, 셋째, 모델링 기준을 적용하여 우편 업무 단계별로 객체 지향 모델을 설계하였다. 마지막으로, 개발 모델에 적용되는 메소드를 분류하고 그 중 일부 메소드는 제약 조건과 트리거 개념을 적용한 능동 기반 메소드로 개발하였으며, 일부는 추론 기능을 지원하는 지식 기반 메소드로 개발하였다. 이와 같이 개발된 메소드는 각 정보의 속성값과 캡슐화되어 저장되어짐으로써 객체-능동-지식 기반 우편 업무 데이타베이스 모델을 형성한다. 마지막으로 개발 모델 동작 시나리오와 서비스 시나리오를 구성하여 실제 응용이 가능함을 보였다.

• 대한물리치료과학회지
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• 제22권2호
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• pp.11-17
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• 2015

Background : The purpose of this study was to investigate the effects of taping on the neck rotation angle in the elderly. Methods : The twenty-eight elderly aged over 60 and twenty-seven college students participated in the study. In both groups, neck rotation angles were measured through CROM before and after taping. SPSS 18.0 was used for data analysis. Results : The results indicated that both groups showed significant increases in the neck rotation angles of the affected side after taping. However, there was no significant difference in the rotation angle of both neck regions after taping. The variation of the student group was higher than that of the elderly group after taping. Conclusion : We think that taping can be effective in balancing the neck muscles of both sides and in increasing the rotation angle of the neck.

• 한국치위생학회지
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• 제15권2호
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• pp.253-259
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• 2015

Objectives: The purpose of this study was to investigate the oral health behavior according to oral health education experience in the elementary school teachers and to provide the basic data for the development of oral health education program. Methods: A self-reported questionnaire was filled out by 239 elementary school teachers in Busan and Ulsan from May 7 to 31, 2013. The questionnaire consisted of general characteristics of the subjects, use of oral health devices, dental clinic visit within a year, purpose of dental clinic visit, subjective oral health condition, place and contents of oral health education, future contents of oral health education, purpose of tooth brushing, recognition of sealant, recognition of dental caries prevention effect of fluoride, and method and frequency of tooth brushing. Data were analyzed by Predictive Analysis Software(PASW) Statistics $19.0^{(R)}$(SPSS Inc., Chicago IL, USA). Results: Of the 239 teachers, 187 teachers had oral health education experience and 52 did not. Those who had oral health education experience reported higher scores in tooth brushing than those who did not. 59.4% of the respondents answered the experience of oral health education in dental clinics. Conclusions: Oral health behavior was different from the experience of oral health education in the elementary school teachers. The teachers are the most important persons influencing on the right tooth brushing habit in the students. So the teachers must take the continuing and systematic oral health education.