• 한국미생물·생명공학회지
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• 제3권3호
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• pp.141-146
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• 1975

전가수분해가 끝난 밤송이에 74% H$_2$SO$_4$로 일차가수분해 시킨 후 1.5kg/㎤의 증기압하에서 40분간 가수분해 시킨 결과 원료에 대해서 49.3%의 당화율을 얻었으며 여기에 Candida utilis를 배양한 결과 당이용율은 60%이며 생성된 중량은 환원당의 62.47%이었다.

• Restorative Dentistry and Endodontics
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• 제36권1호
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• pp.66-71
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• 2011

현 증례보고는 백색 병소의 치료에 있어 Icon (DMG)을 사용한 레진 침투법과 Opalustre (Ultradent Products, Inc.)를 사용한 미세연마술의 효과를 비교하였다. 현 연구의 결과는 비록 두 치료 방법 모두가 백색 병소를 완전히 제거하지는 못하였으나, 레진 침투법이 좀 더 효과적임을 보여주었다. 따라서 레진 침투법은 백색 병소의 치료에 우선적으로 선택될 수 있으며, 이 때 증례 선택에 주의를 기울여야 할 것이다.

• 구강회복응용과학지
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• 제37권2호
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• pp.95-100
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• 2021

수산화칼슘제재는 근관치료 과정 동안 근관 내 첩약제로서 널리 사용되고 있다. 이번 증례 보고에서는 근관 세척제로 사용된 수산화칼슘제재가 치근단 병소로 의도치 않게 과충전된 치아에 대해 정확한 진단과 적절하게 행해진 비외과적인 재근관치료를 통해 성공적으로 치료한 증례를 보고하고자 한다. 과충전된 수산화칼슘제재가 치근단 병소의 치유 과정에 영향을 줄 수 있으므로 수산화칼슘제재의 과충전이 발생하지 않도록 주의를 기울여야 한다.

• Applied Microscopy
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• 제24권3호
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• pp.55-66
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• 1994

This study was carried out to investigate the histological changes of sperm cells in testis, obtained from 100 of 3-year-old male rainbow trout (Oncorhynchus mykiss) collected and analysed from March in 1992 to February in 1993. Especially, the ultrastructural changes of spermatogonia, primary and secondary spermatocytes, spermatids, and spermatozoa were examined to describe the reproductive cycles of this species. The results obtained in this study were as follows: The ultrastructures of the gonadotrophs largely parallel the cyclical changes in the testes. Each nest of cells belongs to one spermatogenetic stage, although nests at different stages can be found within the one lobule. At first keterochromatin is dispersed and then is condensed. In mature gamete, the nucleus is dense and homogeneous. The nuclear membrane appeared at the beginning of differentiation. In spermatogonia, Sertoli cells are located at the periphery of their cytoplasm. In the primary spermatocytes, the small mitochondria are abundant over the outer cytoplasm. During cell differentiation, the cytoplasm decreases and the nucleus increases. In spermatids, the protein masses moved towards the posterior part of the nucleus. In late spermatids, the two large mitochondria are located over the cytoplasm. In spermatozoa, two spheroidal mitochondria (about 145nm long) are situated in parallel between the nucleus and the axoneme. Spermatozoa mitochondria are assembled into an organized sheath surrounding the outer dense fibres and axoneme of the flagellar midpiece. The two centrioles are quite separate and the central pair and sheath complex of the flagellum is inserted into the base of the distal centriole.

• 구강회복응용과학지
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• 제33권2호
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• pp.163-168
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• 2017

전치부에 발생한 치간이개는 심미적으로 문제를 일으키는 흔한 원인이 된다. "Black triangle"을 생성시키지 않고 치간이 개를 폐쇄시키는 것은 심미치과학에서 도전적 과제 중 하나이다. 전치부 수복치료의 성공 여부는 연조직과 경조직간의 심미적인 연합에 달려있다. 이번 증례에서는 치은-치아 계면에서 자연스러운 외형을 가지는 출현윤곽(emergence profile)을 형성하여 줌으로써 치은의 재생 과정이 일어나 심미적으로 만족스러운 치간이개 폐쇄를 이루어내었기에 이를 보고하는 바이다.

• Journal of Biosystems Engineering
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• 제34권3호
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• pp.183-189
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• 2009

Environmental conditions may cause the quality change of fruits during distribution after harvest. In order to prevent the damage or quality change of fruits for distribution, the characteristic of fruits affected by the environmental conditions such as temperature, humidity under various distribution conditions should be known. This research was performed to analyze how the environmental conditions affect the factors such as weight loss rate and ethylene production of the peach under several distribution conditions. Environmental conditions of the actual distributed route were evaluated and the data obtained from the conditions were used for the simulated environmental tests. Regression models of the weight loss rate and the ethylene production of peach were developed and used in predicting peach quality. The weight loss rate of the peach estimated by the ASHRAE data was shown the higher value on the transportation temperature condition than on the low and room temperature conditions. The weight loss rate and the ethylene production of the peach on the simulated distribution conditions were measured and the measured weight loss rate of peach was the smaller than the theoretically estimated one. The regression models of the weight loss rate and the ethylene production were developed respectively.

• 대한치과의사협회지
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• 제48권9호
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• pp.680-687
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• 2010

The purpose of this study was to compare post cementation efficacy according to the different adhesive systems and cement delivery methods. A total of 40 extracted human single-rooted premolar teeth were randomly divided in four groups according to the two luting agents of Unicem applicap (3M ESPE, St. Paul, MN, USA) or Variolink II (Ivoclar Vivadent, Liechtenstein) and cement delivery methods of direct cement application or lentulo spiral application. After restoration using glass?fiber posts, the samples were embedded in acrylic resin. Three sections of 2 mm thickness were prepared from each specimen, and the post in each section was subjected to a push-out test. The data were analysed statistically at significant level of 95%. The Unicem had significantly higher push-out bond strength than Variolink and the lentulo spiral application made higher bond strength (p<0.05). Adhesive failure between cement and dentin was predominant in all groups. The Unicem of self-etch system and cement delivery using lentulo spiral showed clinically acceptable and comparable bonding strength for the fiber post.

• 한국융합학회논문지
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• 제9권6호
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• pp.53-60
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• 2018

본 논문은 듀얼 확장 칼만 필터를 기반으로 2링크 매니퓰레이터의 정밀한 제어를 위한 미지 변수 추정법을 제안한다. 2링크 매니퓰레이터 시스템은 기구학 및 동역학 방정식에 비선형성을 가지며 내부 파라미터의 변화에 민감한 특성을 보인다. 이러한 시스템의 경우 내부 미지 파라미터의 추정이 매우 중요하다. 특히 거친 환경에서 작업을 수행함에 있어서 중량과 관성행렬의 변화는 시스템을 불안정하게 만드는 요소이다. 따라서 본 논문에서 제안한 방법을 기반으로 시스템의 상태 및 미지 변수를 동시에 추정하여 앞서 소개한 문제점들을 해결하고자 한다. 제안한 방법은 Mathwork에서 제공하는 Matlab 기반으로 시뮬레이션을 수행했고, 그 결과는 RLS 알고리즘과 비교하여 성능을 분석하였다. 제안된 방법은 상태 및 미지 변수 추정에 RLS 방법보다 뛰어난 추정 성능을 보임을 확인 하였다.

• 한국미생물·생명공학회지
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• 제16권4호
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• pp.287-292
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• 1988

두유를 L. acidophilus와 K. fragilis로 혼합발효시 균의 생육과 젖산발효에 미치는 아미노산의 영향을 알아보기 위하여 이 두균주가 어떠한 상호작용으로 두유 중의 유리아미노산들과 대두단백질을 이용하는지에 대하여 조사하였다. 두유를 L. acidophilus와 K. fragilis로 혼합발효시 K. fragilis는 두유중의 유리아미노산들을 이용하여 생육하나 부족한 것은 L. acidophilus에 의해 대두단백질이 가수분해되어 생성되는 여러 종류의 유리아미노산들 중 젖산균이 생육인자로 이용하지 않아 발효액에 축적되는 Leu., Phe., Lys., Arg., Glu., Asp., Ala. 등의 유리 아미노산들 특히 Leu., Phe., Lys.을 이용함으로써 K. fragilis의 생육이 촉진된다고 생각되었다. 이와 같은 두균의 아미노산 대사의 상호작용과 당대사의 상호작용(2)을 함께 고려할 경우 두유를 L. acidophilus와 K. fragilis로 혼합발효할 때 두균사이에는 공생관계 (symbiotic relationship)가 성립되었으며 이로 인하여 두유를 두균으로 혼합발효하는 것이 L. acidophilus만으로 단독발효하는 것보다 젖산생성량이 많고 젖산생성속도가 바르다는 것을 알 수 있었다.

• Restorative Dentistry and Endodontics
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• 제26권2호
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• pp.162-170
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• 2001

The purpose of this study was to investigate the effect of cavity configurations on the marginal leakage of class 5 glass ionomer cement and composite resin restorations. Four types of cavities such as saucer shape. notch shape. combined shape(notch shape occlusally and saucer shape gingivally). and U shape were prepared on the buccal and lingual surfaces of 80 extracted premolars(40 cavities for each shape). Occlusal cavity margins were placed at enamel and cervical margins were placed at dentin. 10 cavities of each shape were restored with Ketac Fil as a conventional glass ionomer cement. Fuji II LC improved as a resin modified glass ionomer cement, Z 100 as a hybrid composite resin. and Tetric Flow as a flowable composite resin (40 cavities for each material). After thermocycling, teeth were immersed in 5% basic fuchsin solution for 6 hours and sectioned longitudinally in a buccolingual direction through the center of the restoration. The dye penetrations at the tooth restoration interface were examined by stereomicroscope. The Result were as follows 1. In saucer shape, notch shape and combined shape, composite resin restorations showed lesser leakage than glass ionomer restorations(p<0.05) and in U shape. Tetric Flow showed the least marginal leakage and others were decreased as Z 100. Fuji II LC improved, Ketac Fil in that order. There were statistically significant difference between Tetric Flow and Fuji II LC improved. Ketac Fil and between Z 100 and Ketac Fil(p<0.05). 2. In Ketac Fil restoration group, saucer shape showed the highest marginal leakage and U shape showed the least marginal leakage and others were decreased as notch shape, combined shape in that order. There were statistically significant difference between saucer shape and combined shape, U shape and between notch shape and U shape(p<0.05). 3. In Fuji II LC improved restoration group, U shape showed the least marginal leakage. There were statistically significant difference between U shape and other three shapes(p<0.05). 4. The cavity configuration had no significant effect on marginal leakage of composite resin restorations(p>0.05).