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임경욱,이광희,라지영,안소연,김윤희 大韓小兒齒科學會 2010 大韓小兒齒科學會誌 Vol.37 No.2
연구목적은 모유 또는 분유 섭취 시 나타나는 유치열의 치면별 우식패턴에 차이가 없으며 수유기간에 따른 차이도 없다는 가설을 검증하는 것이었다. 익산시, 청주시, 울산광역시의 36-71 개 월 어린이 815명을 대상으로 구강검사로 치면별 우식경험도를 조사하고, 보호자들을 대상으로 설문지 조사법으로 모유와 분유 중에서 생후 1년간 주로 수유한 것과 수유 기간을 조사하였다. 모유군과 분유군 간 우식경험유치면수(dmf)의 차이는 유의하지 않았다. 모유군에서 분유군보다 우식경험도가 더 높았던 유치군은 상악 유전치이었고, 유치면군은 상악 유전치 협설면과 인접면이었으며, 유치는 상악 유절치와 상하악 제2유구치이었고, 유치면은 상악 유중절치의 협면과 원섬면, 상악 유측절치의 협설면, 인접면, 상악 제2유구치의 설면, 인접면, 교합면, 하악 제2유구치의 협면, 원심면이었다. 모유군에서 수유기간이 증가함에 따라 우식경험유치면수가 증가한 유치군은 상악 유전치와 상악 유구치이었고, 유치면군은 상악 유전치의 인접면, 상악 유구치의 협설면, 인접면, 교합면, 하악 유구치의 인접면이었으며, 유치는 상악 유전치, 상악 유구치, 하악 제 2유구치이었고, 유치면에서는 상악 유전치의 인접면, 상악 제 1유구치의 협설면, 인접면, 교합면, 상악 제 2유구치의 협면, 하악 제 2유구치의 근심면이었다. 분유군에서는 수유기간 3년 이상에서 우식경험유치면수가 증가하였으나 차이가 유의하지 않았다. 수유와 관련되어 발생하는 상악 유절치의 중증 유아기 우식증은 분유를 수유하는 경우보다 모유를 수유하는 경우에 더 많이 발생하였다. 모유 수유를 2년 이상 하는 경우에는 상악 유절치의 우식 예방을 위한 조치가 필요하다. The purpose of this study was to investigate the tooth surface caries patterns in the primary dentition according to breast or bottle feeding. The subjects of study were 815 children, 36 to 71 months old, in Iksan, Cheongju and Ulsan cities. The caregivers of the children were asked which they fed between the breast milk and the infant formula during the 1st year after birth and the duration of feeding. There was no significant difference in dmfs between the breast milk group and the infant formula group(significance level 0.05, same below). Tooth groups, tooth surface groups, teeth, and tooth surfaces which had significantly higher dmfs in the breast milk group than in the infant formula group were upper anterior teethttooth groups), upper incisors' buccal and proximal surfacesttooth surface groups), upper incisors and upper second molars (teeth), upper central incisors' buccal and distal surfaces, upper lateral incisors' buccolingual and proximal surfaces, upper 2nd molars' lingual. proximal. and occlusal surfaces, and lower 2nd molars' buccal and distal surfaces. In the breast milk group, tooth groups, tooth surface groups, teeth, and tooth surfaces which dmfs significantly increased as the duration of the feeding increased were upper anterior teeth and upper molars (tooth groups), upper anterior teeth's proximal surfaces, upper molars' buccolingual, proximal, and occlusal surfaces, lower molars' proximal surfacesttooth surface groups), upper anterior teeth, upper molars, lower 2nd molars (teeth), upper anterior teeth's proximal surfaces, upper 1st molars' buccolingual, proximal. and occlusal surfaces, upper 2nd molars' buccal surfaces, and lower 2nd molars' mesial surfaces (tooth surfaces). In the infant formula group, dmfs increased after 3 years of feeding, but the difference was not significant. Caries prevention is necessary in case of breastfeeding more than two years.
3관능성 BPA-3MA를 기질로한 광중합형 치면열구전색재의 물성 연구
박경준,김경남,안광덕,김광만,한동근,전호욱 대한치과기재학회 1998 대한치과재료학회지 Vol.25 No.2
The BPA-3MA(bisphenol-A trimethacrylate) in which one of two hydroxy group was substituted by methacrylate was synthesized by reaction of Bis-GMA with methacryloyl chloride. To investigate the possibility to apply BPA-3MA as matrix of composite resin or pit and fissure sealant, BPA-3MA(3MA) or Bis-GMA(GMA) as matrix, TEGDMA as diluent, CQ as photosensitizer, EDMAB as photoinitiator and 5㎛ pyrogenic silica as filler were used for making experimental sealants. In addition, these experimental sealants were compared to a commercial Concise L/C White sealant(CLW, 3M Co, U.S.A.) for flexural strength, diametral tensile strength, amount of abrasion, surface hardness, water sorption and solubility, and degree of conversion. The flexural strength of CLW was the highest value but there was not significant difference with 3MA. Diametral tensile strength of all 3 groups were similar(p>0.05) and the amounts of abrasion of 3MA and GMA were less than that of CLW(p<0.05). The surface hardness of 3MA was higher than that of GMA(p<0.05) but similar to that of CLW. The water sorption of 3MA was less than that of GMA and CLW(p<0.05) and the solubilities of 3MA and CLW were than that of GMA(p<0.05). GMA and CLW were relatively polymerized well as compared to 3MA. From these results, pit and fissure sealant using trifunctional BPA-3MA as matrix had superior physical and mechanical properties to existing Bis-GMA sealant. Furthermore, it will be possible to develop composite resin having superior properties to existing composite resin.
최경숙,이유상,장용이,조은영,전현옥,김창현,김상욱,홍경수 大韓神經精神醫學會 2004 신경정신의학 Vol.43 No.5
Objectives : This study aims at examining familial associations of symptoms and clinical characteristics in affected sibling or relative pairs of schizophrenia as an effort to identify genetically homogeneous phenotypes. Methods : Forty-seven relative pairs with DSM-IV diagnosis of schizophrenia from thirty-five Korean families multiply affected with schizophrenia were ascertained. Direct interviews were done using the Korean version of Diagnostic Interview for Genetic Studies (DIGS). The Krawieka Rating Scale and the Schedule for the Deficit Syndrome were also applied for further evaluation of psychopathologies. Intra-familial concordances and correlations of clinical characteristics and symptoms were tested using χ² -test and Spearman's correlation. Results : Significantly high concordance rate within relative pairs was found for the diagnosis of paranoid vs. non-paranoidsubtype (χ²=7.623, P=0.006, df=1). Deficit vs. non-deficit syndrome also showed significant concordance (χ² =3.850, p=0.0497, df=1). Among single symptom items in DIGS, only 'auditory hallucination' showed significant concordance rate ( χ² =5.503, P=0.019, df=1). Factor analysis for symptoms items in the Rrawiecka Rating Scale indicated three symptom dimensions ; negative, psychotic and affective, Psychotic (P =0.442, P=0.003) and affective dimension scores (p =0.427, P=0.004) showed significant intra-familial correlations. Age at onset of recognized psychotic symptoms showed significant correlation only within the male sibling pairs. Conclusion : Familial factors, Possibly genetic factor contribute to the phenotypic characteristics of paranoid vs. non-para-noid subtype, deficit vs. non-deficit syndrome, auditory hallucination, and affective syndrome, It supports their use in the delineation of homogeneous subgroups for future genetic studies.
( Yun Kyeong Cho ),( Seung Ho Hur ),( Hyun Tae Kim ),( In Cheol Kim ),( Hyoung Seob Park ),( Hyuck Jun Yoon ),( Chang Wook Nam ),( Hyung Seop Kim ),( Seong Wook Han ),( Yoon Nyun Kim ),( Kwon Bae Kim 대한내과학회 2009 The Korean Journal of Internal Medicine Vol.24 No.4
Background/Aims: Recent intravascular ultrasound (IVUS) studies of sirolimus-eluting stents (SES) and paclitaxel-eluting stents (PES) have demonstrated a significant reduction in neointimal hyperplasia (NIH) based on simple coronary lesions. In this study, we evaluated the efficacy of SES and PES using IVUS in complex coronary lesions. Methods: Eighty-seven patients in whom 95 drug-eluting stents (66 SES and 29 PES) were implanted in complex coronary lesions were enrolled in this study. Case selection was based on the availability of IVUS and quantitative coronary angiographic (QCA) examinations at the index procedure and at follow-up. The neointimal volume index (volume/length: NIVI) and percent neointimal volume (% NIV) were calculated. The longitudinal length of stented segments without IVUS-detectable NIH was also evaluated. Results: The baseline patient demographics were similar between the SES and PES groups. At follow-up, no significant differences were observed in the vessel, plaque, or stent volume indices between the two groups. However, the NIVI and % NIV were significantly lower in the SES group (p<0.01). The longitudinal length of stented segments without IVUS-detectable NIH was significantly higher in the SES group (p<0.01). The net gain was significantly larger in the SES group (2.3±0.7 vs. 2.0×0.6 mm, p=0.025), while the rate of major adverse cardiac events was similar between the two groups. Conclusions: Although SES showed significantly greater suppression of NIH at follow-up, both stents were highly effective at inhibiting NIH in complex coronary lesions. (Korean J Intern Med 2009;24:323-329)
근적외선 분광분석법 이용한 출수기 후 벼의 함수율 예측 딥러닝 모델 개발
김남욱 ( Nam-wook Kim ),이홍구 ( Hong-gu Lee ),양하은 ( Ha-eun Yang ),김상은 ( Sang-eun Kim ),상완규 ( Wan-gyu Sang ),백재경 ( Jae-kyeong Baek ),모창연 ( Changyeun Mo ) 한국농업기계학회 2022 한국농업기계학회 학술발표논문집 Vol.27 No.2
국내 주요 작물로서 많은 양이 생산 및 소비되는 벼는 디지털 농업 기술의 선도적 적용을 통한 고도화가 유망한 작물 중 하나이다. 벼의 수분함량은 생산, 수확, 수확후 과정에서 식미, 품질 변화, 도정 효율 등 벼의 상품성 및 생산성에 큰 영향을 미치는 중요한 요소이다. 이를 향상시키기 위해 종자에 손상을 가하지 않음과 동시에 신속하고 정확한 수분함량 측정을 통한 적절한 농업 의사결정 및 수확 후 관리가 요구된다. 따라서 본 연구에서는 근적외선 분광분석법을 이용하여 도정 전 벼 함수율을 비파괴적으로 예측할 수 있는 딥러닝 모델을 개발하였다. 시료로 2022년 국립식량과학원에서 추수된 도정 전 상태의 신동진 벼가 사용되었으며, 출수기 후 14일, 21일, 28일, 35일, 42일이 지난 벼 종자를 획득하여 사용하였다. 각각의 그룹을 직경 50mm, 높이 15mm의 시료 용기에 담아 75개씩 샘플을 제작하여 샘플별 10회 분광 측정하였으며, 스펙트럼 측정 후 자연 건조를 통해 함수율 변화에 따른 스펙트럼을 추가적으로 측정하였다. 측정된 데이터들은 스펙트럼 전처리를 적용하여 학습 및 검증 데이터로 사용하였으며, 이후 인공신경망 네트워크를 개발하고 학습시켜 출수기 이후 벼 내부의 함수율 예측하는 딥러닝 모델을 개발하였다. 그 결과 근적외선 분광 기술과 딥러닝 알고리즘을 접목함으로서 벼의 함수율 측정이 가능함을 보였다. 또한 수확 벼의 물성 데이터 획득부터 함수율 예측까지의 과정을 비파괴적으로 신속하고 수행할 수 있는 방법을 제시하였다. 추후 벼 품질 결정 중요 인자들에 관한 연구들과 함께 활용되어 콤바인 기반 실시간 데이터 취득 및 품질 판정 시스템 연구 및 개발에 대한 기초 자료로 활용 가능할 것으로 판단된다.