• Journal of Periodontal and Implant Science
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• 제48권4호
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• pp.236-250
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• 2018

Purpose: Resorption of the alveolar bone is an unavoidable consequence of tooth extraction when appropriate alveolar ridge preservation (ARP) measures are not taken. The objective of this trial was to test the hypothesis that dimensional changes in the alveolar bone after tooth extraction would be reduced by inserting an equine collagen membrane and a collagen cone to fill and seal the alveolus (as ARP), in comparison to extraction with untreated alveoli. Methods: In this randomized clinical trial, 31 patients were directly treated with the collagen material after extraction of a tooth from the maxilla (the ARP group). Twenty-nine patients served as the control group. After extraction, no further treatment (i.e., no socket preservation measures) was performed in the control group. Changes in the alveolar process immediately after extraction and after an 8 (${\pm}1$)-week healing period were evaluated 3-dimensionally. Blinded analyses were performed after superimposing the data from the digitalized impressions and surfaces generated by cone-beam computed tomography. Results: Both the ARP and control groups showed a reduction of bone in the alveolar area after tooth extraction. However, significantly less bone resorption was detected in the clinically relevant buccal region in the ARP group. The median bone reduction was 1.18 mm in the ARP group and 5.06 mm in the control group (P=0.03). Conclusions: The proposed hypothesis that inserting a combination material comprising a collagen cone and membrane would lead to a difference in alveolar bone preservation can be accepted for the clinically relevant buccal distance. In this area, implantation of the collagen material led to significantly less alveolar bone resorption. German Clinical Trials Register at www.drks.de, DRKS00004769.

• 디자인학연구
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• 제16권4호
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• pp.225-232
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• 2003

독일의 철학자 노르베르트 볼츠(Norbert Bolz)는 디지털 영상미디어가 초래할 인간사고 방식의 근본적이고 전면적인 방식의 전환을 예고하면서, 마샬 맥루한으로 시작했던 활판인쇄로 강화된 근대문자 문화에 대한 비판의 맥락으로 근대 이성문명의 상징인 '구텐베르크의 은하계'의 종말을 강조하고 있다. 그는 디지털미디어라는 첨단 복합 미디어를 통해 이성을 중심으로 한 유럽 문명의 한계가 극복되리라 예견한 것이다. 커뮤니케이션의 상실된 생명력을 재생할 수 있다는 관점에서 미학의 원해 의미인 '감성적 지각(aisthesis)'을 강조하고, 칸트가 말하는 오감의 자유로운 유희 상태가 가능한 커뮤니케이션 미디어의 회복을 주장한다. 본 소고는 하이퍼미디어로써 영상 미디어의 선두 격인 디지털 애니메이션이 그 독특한 예술적 형식으로 효과적인 커뮤니케이션을 가능케 할 것이라 보고 있다. 이는 근대 이성 중심 주의에 짓눌려온 인간의 감성을 회복하는데 디지털 애니메이션 이 중요한 역할을 할 수 있다는 데서 출발한다. 또한, 디지털 애니메이션이 시간과 공간을 다루고 자유로운 표현이 가능하다는 점, 그리고 컴퓨터 기술의 집약으로 종합 미디어적 특성을 발휘해 효과적인 커뮤니케이션을 수행할 수 있다는 전들에 근거해, 새로운 예술 형식으로써의 가능성에 대해 분석하고자 한다. 특히, 미디어 분석가 겸 디자인과 교수인 노르베르트 볼츠의 하이퍼 미디어적인 뉴미디어 이론과의 연계성에 중점을 두고 있다.

• Asian-Australasian Journal of Animal Sciences
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• 제23권7호
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• pp.916-923
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• 2010

We report nutritional physiology and non-specific immune responses of vitamin E in parrot fish for the first time. This study aimed to investigate the essentiality and requirements in diets based on growth performances, non-specific immune responses and a challenge test against Vibrio angullarum. Six casein-gelatin based semi-purified diets were formulated to contain six graded levels of DL-${\alpha}$-tocopheryl acetate (${\alpha}$-TA) at 0, 25, 50, 75, 100 and 500 mg/kg diet (designated as E0, E25, E50, E75, E100 and E500, respectively) and fed to triplicate groups of juvenile parrot fish for 12 weeks. The analyzed dietary concentrations of vitamin E were 0, 38, 53, 87, 119 and 538 mg/kg diet for E0, E25, E50, E75, E100 and E500, respectively. At the end of the feeding trial, growth performance and feed utilization of fish fed the E25 were significantly higher compared to that of fish fed the other diets. Liver ${\alpha}$-tocopherol concentration was significantly increased with an increase in dietary ${\alpha}$-TA in a dose dependent manner. No apparent clinical signs of vitamin E deficiency and mortality were observed in fish fed the basal diet for 12 weeks. Among the immune responses assayed, phagocytic (NBT assay) and myeloperoxidase activities were significantly increased with increment of dietary ${\alpha}$-TA levels. During the challenge test with V. anguillarum, E75, E100, and E500 diets resulted in higher survivals than E0, E25 and E50 diets. The findings of this study suggest that parrot fish require exogenous vitamin E and the optimum dietary level could be approximately 38 mg ${\alpha}$-TA/kg diet for normal growth and physiology. Dietary ${\alpha}$-TA concentration over 500 mg/kg could be required to enhance the nonspecific immune responses and improve the resistance of juvenile parrot fish against V. anguillarum.

• Journal of Animal Science and Technology
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• 제60권5호
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• pp.13.1-13.7
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• 2018

Background: The objective of this study was to underline that litter size as a key trait of sows needs new parameters to be evaluated and to target an individual optimum. Large individual variation in litter size affects both production and piglet's survival and health negatively. Therefore, two new traits were suggested and analyzed. Two data sets on 5509 purebred German Landrace sows and 3926 Large White and crossing sows including at least two parental generations and at least five parities were subjected to variance components analysis. Results: The new traits for evaluating litter size were derived from the individual numbers of total born piglets (TBP) per parity: In most cases, sows reach their maximum litter size in their fourth parity. Therefore, data from at least five parities were included. The first observable maximum and minimum of TBP, and the individual variation expressed by the range were targeted. Maximum of TBP being an observable trait in pig breeding and management yielded clearly higher heritability estimates ($h^2{\sim}0.3$) than those estimates predominantly reported so far. Maximum TBP gets closer to the genetic capacity for litter size than other litter traits. Minimum of TBP is positively correlated with the range of TBP ($r_p=0.48$, $r_g$ > 0.6). The correlation between maximum of TBP and its individually reached frequency was negative in both data sets ($r_p=-0.28$ and - 0.22, respectively). Estimated heritability coefficients for the range of TBP comprised a span of $h^2=0.06$ to 0.10. Conclusion: An optimum both for maximum and range of total born piglets in selecting sows is a way contributing to homogenous litters in order to improving the animal-related conditions both for piglets' welfare and economic management in pig.

• 한국임상수의학회지
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• 제19권4호
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• pp.433-435
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• 2002

다양한 피부병을 갖고 있는 52두의 개에 대해 Geotrichum candidum의 감염율을 조사하였다 피부가검물은 15% KOH용액으로 케라틴을 용해한 후 현미경으로 직접 검사하였다. 또한 Sabouraud dextrose agar, chloramphenicol을 함유한 Sabouraud dextrose agar 및 brain heart infusion agar에 피부가검물을 접종하여 $25^{\circ}C와\;37^{\circ}C$에서 배양하여 원인균을 배양하고, 배양물을 현미경으로 검사하였다. 52두 중 2두의 가검물에 대한 직접 현미경 검사에서 직사각형 내지 원기둥형의 분절포자와 격벽이 있는 균사가 관찰되어 Geotrichum 감염이 제시되었다. 이 가검물의 배양물에서 균사와 $4-8\;\mu\textrm{m}$의 포자가 관찰되었다. 또한 이 진균은 분아포자를 생성하지 않고, 요소의 이용과 맥아당의 동화작용을 나타내지 않았다. 이 두 마리리의 피부염은 2% gentian violet또는 2% miconazole 의 국소적용에 임상적인 차도를 나타내었다 Geotrichum candidum은 사물기생성 진균이지만 개에 있어서 피부염의 원인이 될 수 있기 때문에 피부염 감별진단에 포함시켜야 할 것임을 제시하였다.

• 대한구순구개열학회지
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• 제4권2호
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• pp.19-27
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• 2001

This study was performed to determine the prevalence of hypodontia and hyperdontia of permanent teeth among Korean schoolchildren, and to compare differences in the prevalence between Korea, other country, and other ethnic groups. The sample consisted of 346 girls aged 6.9～0.3 yr and 375 boys aged 6.8～0.4 yr on whom a panoramic radiograph was taken at Yeonchun-Gun community in Korea. The prevalence of congenitally missing teeth (third molars excluded) was 6.7% in boys and somewhat higher, 9.5% in girls, and 8.0% for both sexes combined. On the average, number of missing teeth per affected child was 1.9 teeth. The most commonly congenitally missing teeth were the mandibular second premolar (32.7%), followed by the mandibular incisor (28.7%), the maxillary second premolar (16.7%), and the maxillary lateral incisors (10.2%). The prevalence of supernumerary teeth was 2.1 % in boys, 1.4% in girls, and 1.8% for both sexes combined. The most common supernumerary teeth were the mesiodens (76.9%), followed by the supernumerary premolar (23.1 %). The affected male-female ratio was 1.6: 1.0. The prevalence of congenital missing teeth in this study was similar to in studies of Japanese, Danish, American and German. The frequency of hyperdontia was lower in this study than in studies of Chinese children, Japanese and American.

• 한국산학기술학회논문지
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• 제15권5호
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• pp.3176-3182
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• 2014

본 논문은 유럽에서 근대건축의 헤게모니 다툼이 치열하게 전개되고 있던 1920년대 일본의 근대건축이 어떠한 성향을 지니면서 발전하게 되는지를 분리파건축회(Japanese Secessionist)의 건축이론과 작품을 통해 살펴보고자 한다. 분리파건축회는 1920년부터 1928년까지 9년이라는 짧은 시간동안 활동한 전위예술가(Avant-garde) 단체이지만, 이들의 도전적이고 활발한 활동이 일본 근대건축의 전통성 논쟁을 비롯해 예술가의 지위에 대한 논란을 불러일으켰다는 점에서 근대건축의 발전에 있어 중요한 위치를 차지하고 있다. 본 논문은 분리파건축회가 창립하게 되는 배경과 더불어 일본 근대건축의 중요한 역사적 사건으로 평가할 수 있는 제반요소들을 제시하고자 한다. 또한, 이들의 급진적인 건축관을 당대 유럽 건축계의 흐름과 대비시켜 파악하고, 근대건축의 전반적인 맥락에서 분리파건축회가 지니는 건축적 경향과 특징을 규명하고자 한다.

• 대한조선학회논문집
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• 제46권6호
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• pp.667-674
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• 2009

The researches on the development of composite material underwater vehicle propeller have been actively attempted for the reduction of radiation noise with outstanding damping effects. Composite material propellers have almost been designed and produced by the foreign experts, and it is difficult to obtain the related informations about their flow, vibration, material characteristics because they are treated as the secrets with close relationship to the military technology, especially in the case of underwater vehicles. For the security of domestic manufacture of composite material propeller and the comparison and examination of its performance and radiation noise characteristics with those of German CONTUR composite material propeller, two propellers were self-produced according to the fiber weaving and array using compressible molding process and their self performances and radiation noise characteristics were measured. The mean fluctuations of blade tip of self-produced composite material propeller were increased and the radiation noises in the low frequency band were reduced compared to those of CONTUR, which could be estimated as the change of material characteristics and also be thought to be used for the future research informations.

• 한국환경복원기술학회지
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• 제21권6호
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• pp.83-93
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• 2018

In Germany has a long history of ecological restoration and restoration management. At the beginning of the 1990s, the "Erfolgskontrolle" was used as an evaluation program after the restoration project and many exchanges of views took place. It is the time, in Korea, there is a need for a comprehensive evaluation program after the restoration project, as there is no evaluation method yet. At this time it may be the "Erfolgskontrolle" in Germany as a practical model for the Korean restoration management program. The purpose of this study is to identify the concept and character of the "Erfolgskontrolle" and to demonstrate the implication and potential of application, through the analysis of the implementation example of the revaluation of river revitalization. To achieve the goal was carried out theoretical and 3 exemplary revitalization research cases. And it was endeavored to deliver the German way of acting and the basic idea to Korea. For the restoration, the "precautionary principle" should be considered first, the upper legal regulation should not be violated. In order to apply "Erfolgskontrolle" in practice, the goal formulation should be clear and systematically evaluated. And through the collection of typified cases, the comprehensive and unified theory should be established, it is possible, thus the qualitative assessment of the restoration project.

• 천문학회지
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• 제52권5호
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• pp.159-172
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• 2019

It is known that the number of astronomers of a country registered to the International Astronomical Union (IAU) is correlated with that country's gross domestic product (GDP). However, the robustness of this relationship could be doubted, as the fraction of astronomers joining the IAU differs from country to country. Here we revisit this correlation by using more recent data, updated as of 2017. We find a similar correlation by using the total number of astronomers and astrophysicists with PhD degrees that are working in each country, instead of adopting the number of IAU members. We confirm the existence of the correlation. We also confirm the existence of two subgroups within this correlation. One group consists of advanced European countries having a long history of modern astronomy, while the other group consists of countries having experienced recent rapid economic development. In order to determine the cause for the correlation, we obtained the long-term variations of the number of astronomers, population, and the GDP for a number of countries. We find that the number of astronomers per capita for recently developing countries has increased more rapidly as GDP per capita increased, than that for fully developed countries. We collected demographic data of the Korean astronomical community and find that it has experienced recent rapid growth. From these findings we estimate the proper size of the Korean astronomical community by considering Korea economic power and population. The current number of PhD astronomers working in Korea is approximately 310, but it should be 550 in order for it to be comparable and competitive to the sizes of the Spanish, Canadian, and Japanese astronomical communities. If current trends continue, this number will be reached by 2030. In order to be comparable to the German, French, and Italian communities, there should be 800 PhD astronomers in Korea. We discuss ways to overcome the vulnerability of the Korean astronomical community, based on the statistics of national R&D expenditure structure in comparison with that of other major advanced countries.