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Socket preservation using deproteinized horsederived bone mineral
박장열,구기태,설양조,이용무,구영,류인철,정종평,김태일 대한치주과학회 2010 Journal of Periodontal & Implant Science Vol.40 No.5
Purpose: The healing process following tooth extraction apparently results in a pronounced resorption of the alveolar ridge. As a result, the width of alveolar ridge is reduced and severe alveolar bone resorption occurs. The purpose of this experiment is to clinically and histologically evaluate the results of using horse-derived bone mineral for socket preservation. Methods: The study comprised 4 patients who were scheduled for extraction as a consequence of severe chronic periodontitis or apical lesion. The extraction was followed by socket preservation using horse-derived bone minerals. Clinical parameters included buccal-palatal width, mid-buccal crest height, and mid-palatal crest height. A histologic examination was conducted. Results: The surgical sites healed uneventfully. The mean ridge width was 7.75 ± 2.75 mm at baseline and 7.00 ± 2.45 mm at 6months. The ridge width exhibited no significant difference between baseline and 6 months. The mean buccal crest height at baseline was 7.5 ± 5.20 mm, and at 6 months, 3.50 ± 0.58 mm. The mean palatal crest height at baseline was 7.75 ± 3.10 mm, and at 6 months, 5.00 ± 0.82 mm. There were no significant differences between baseline and 6 months regarding buccal and palatal crest heights. The amount of newly formed bone was 9.88 ± 2.90%, the amount of graft particles was 42.62 ± 6.57%, and the amount of soft tissue was 47.50 ± 9.28%. Conclusions: Socket preservation using horse-derived bone mineral can effectively maintain ridge dimensions following tooth extraction and can promote new bone formation through osteoconductive activities.
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이중 더블 다이아몬드 모델을 이용한 관광산업 경쟁력 분석 - 한국과 일본의 비교를 중심으로 -
박장열,김현,고동완 한국관광학회 2010 관광학연구 Vol.34 No.9
Using the Dual Double Diamond model, this study was to compare the tourism industry competitiveness between Korea and Japan. Data was collected from the previous study of Sim Won-Sub(2007) and yearbooks/technical reports of international institutions, such as IMD, IPS, OECD, UIA, UNWTO, WEF, and WTTC. Results showed that in terms of physical factors(i.e., the domestic infrastructure and fundamental facility size), Korea’s competitiveness was lower than those of Japan. In contrast, in terms of human factor such as the abilities of tourism industry workers, professionals, and businessmen, Korea’s competitiveness turned out to be higher than those of Japan. Results of this study suggest that in order to strengthen the competitiveness of tourism, Korea should focus on physical factor of tourism by expanding government expenditure and investment of tourism industry, strengthening fundamental facility, and increasing domestic tourism demand. 본 연구는 국가 경쟁력을 보다 포괄적으로 분석할 수 있는 실증분석 모델로 평가되고 있는 이중 더블 다이아몬드 모델을 이용하여 한국과 일본의 국가 관광산업의 경쟁력을 세부적인 결정요인별 측정지표로 비교 분석한 것이다. 연구 결과 한국의 관광산업 경쟁력을 강화하기 위해서 첫 번째로, 생산요소의 경쟁력을 강화하기 위해서 관광산업에서의 정부지출을 확대하고, 숙박시설 등의 관광인프라의 투자 증대와 외국인들의 방한 및 참여를 높일 수 있는 국제회의 등의 메가 이벤트의 개최를 증가시켜야 할 것으로 나타났다. 경영여건의 경쟁력 강화를 위해 관광산업의 매출을 증대시키고, 부가가치액을 높이기 위해 생산성 및 효율성 강화가 요구된다. 관련 및 지원산업에서의 경쟁력 강화를 위해 도로, 철도 등의 기본 인프라의 증대와 국가브랜드 지수를 높이고, 사회적인 안정성 강화에 노력해야 될 것으로 나타났다. 또한, 시장수요조건과 관련해서는 국민관광 참여와 수요를 증대시켜 관광시장의 양적인 측면과 질적 측면을 모두 향상시키고, 소비자 물가수준 및 생활비 등의 물가관리가 요구된다. 인적요소 부문으로 근로자에서는 관광산업의 양적, 질적 발전을 위하여 우수한 인력을 확보하여, 관련 산업의 생산성을 높여야 할 필요가 있다. 정치 행정적 측면에서는 정부의 경쟁력을 높이고 관광관련 서비스 산업 육성을 위하여 제도 개선이 필요할 것으로 나타났다. 마지막으로 기업가와 전문가 측면에서는 전문가가 관광산업에서의 지속적인 참여 및 직업에 대한 개방성을 높여야 할 필요가 있다.
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애니메이션 TV-CM사례 연구 - 라인애니메이션을 중심으로 -
박장열 ( Park Jang Yul ),이인걸 ( Lee In Gul ) 한국디자인트렌드학회 2005 한국디자인포럼 Vol.12 No.-
디지털기술의 발달로 휴대폰이 필수품이 되었고 언제 어디서나 메신저의 채팅창을 통해 끊임없는 대화를 나누며 텔레비전 속에서 세상 온갖 문물을 만나볼 수 있는 디지털문명시대 속에 우리는 살아가고 있다. 하지만 사람들은 기술의 발전이 주는 문명의 이기 속에서 오히려 변화에 소외될 것을 두려워하며 시대의 급박한 흐름에 휩쓸려 경제 불황의 늪에서 허덕이고 있다. 이러한 불안과 불황의 분위기를 돌파하기 위해 최첨단의 기술 속에서 인간다움을 찾고, 차가운 라인들을 통해 서로 따뜻함을 교류하는 아이러니를 연출하고 있다. 이런 상황은 사회상을 대변하는 영상매체 속에서도 나타나고 있다. 현재 제작되고 있는 대부분의 3D 애니메이션 작품들이 기존의 차갑고 사실을 표방한 이질적 기법에서 벗어나 2.5D(3D의 카툰화)기법을 통해 따뜻한 분위기와 인간다움을 담은 라인 애니메이션으로 변화하고 있다. 본 논문은 3D CG가 가진 다양한 공간구성의 가능, 광범위한 크리에이티브의 표출, 지속적 사용 가능성 등의 장점에 덧붙여 따뜻하고 인간다운 휴머니티를 찾는 사회분위기에 발맞춰 라인 애니메이션을 활용한 TV-CM에 대해 분석해보고 앞으로의 발전가능성에 대해 논의해보고자 한다. We are living in the digital era that celluar phone became a must-have item, on-going conversation through the internet chatting program is available to us anytime anywhere and TV allows us to meet all the kinds of culture over the world. In other words, we live in the period of digital civilization. However, people are afraid of getting behind changes under a modern convenience resulted from the advancement of technology and struggled with an economic depression due to the rapid current of the times. It is a gloomy turn of the digital period. To find a way out of the fear and depression, people ironically try to find human nature in the state-of-the-art technologies and interchange heart-warming mind with cold liens. The ironical situation is also found in video media representative of a mirror of society. Currently, most 3D animation works pursue not the existing heterogeneous technique expressing cold-hearted and actual aspects but 2.5D (cartoonization of 3D) technique, which allows expression of warn-hearted mood and human nature with line animation. This study is to describe various advantages of 3D CG including formation of various space structures, wide expression of creativity and continuous availability analyze TV-CMs using line animation on the basis of the social mood pursuing warm-hearted and human nature, and discuss its development potential in future.
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박판의 재인발 가공 에서의 한계인발비 및 성형하중 의 예측 에 관한 연구
박장호,양동열 대한기계학회 1983 대한기계학회논문집 Vol.7 No.3
The study is concerned with the analysis of sheet metal for the prediction of limit drawing ratio and forming load. The direct redrawing process is analyzed by using an equilibrium approach and strain increment theory both for non-workhardening material and for workhardening material. Computations are carried out numerically for the workhardening case. Limit drawing ratios are predicted for some chosen variables. The forming loads are also computed with respect to punch travel. Then the predicted loads are compared with the experimental results. For ordinary lubricated conditions, the comparison shows reasonable agreement between the theory and experimental observation. It is also shown that limit drawing ration can be increased by using a greater die angle and proper lubrication significantly reduces the punch load. Finally numerical results show that material of greater R-value and strain-hardening exponent(n)is better for direst redrawing of sheet metal.
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Biological effects of a root conditioning agent for dentin surface modification in vitro
이주연,설양조,박장열,정종평 대한치주과학회 2011 Journal of Periodontal & Implant Science Vol.40 No.6
Purpose: Connective tissue reattachment to periodontally damaged root surfaces is one of the most important goals of periodontal therapy. The aim of this study was to develop a root conditioning agent that can demineralize and detoxify the infected root surface. Methods: Dentin slices obtained from human teeth were treated with a novel root planing agent for 2 minutes and then washed with phosphate-buffered saline. Smear layer removal and type I collagen exposure were observed by scanning electron microscopy (SEM) and type I collagen immunostaining, respectively. Cell attachment and lipopolysaccharides (LPS) removal demonstrated the efficiency of the root conditioning agent. Results: SEM revealed that the smear layer was entirely removed and the dentinal tubules were opened by the experimental gel. Type I collagen was exposed on the surfaces of the dentin slices treated by the experimental gel, which were compared with dentin treated with other root planing agents. Dentin slices treated with the experimental gel showed the highest number of attached fibroblasts and flattened cell morphology. The agar diffusion assay demonstrated that the experimental gel also has effective antimicrobial activity. Escherichia coli LPS were effectively removed from well plates by the experimental gel. Conclusions: These results demonstrated that this experimental gel is a useful tool for root conditioning of infected root surfaces and can also be applied for detoxification of ailing implant surface threads.
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