• 제목/요약/키워드: 성장변화

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A cephalometric evaluation of anterior j hook headgear traction to the maxilla (Anterior j hook headgear를 이용한 상악골 성장억제에 관한 연구)

  • Chung, Kyu-Rhim;Kang, Jang-Yun
    • The korean journal of orthodontics
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    • v.30 no.4 s.81
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    • pp.387-398
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    • 2000
  • This study was aimed to observe the effect of Anterior J hook headgear on the craniofacial structures in mixed dentition with Class II malocclusion. The laterial cephalograms of 20 children treated by Anterior J hook headgear were traced, digitized and statistically analyzed. The results were as follows : 1. Forward growth of maxilla was inhibited. 2. Rotational effect of maxilla was not observed. 3. There was distal movement of maxillary dentition. 4. Maxillarly_dentoalveolar growth changes were more effective in anterior portion than posterior portion. 5. Mandible maintained a normal growth and mandibular plane angle was maintained during treatment period. 6. The ratio of anterior facial height to posterior facial height was almostly not changed.

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Derivation of priority to National HRD Projects for Green Human Resources (녹색인재양성을 위한 국가정책과제 우선순위 도출)

  • Lee, Jungmann;Shin, Sunghun;Lee, Jeongho
    • Proceedings of the Korea Contents Association Conference
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    • 2011.05a
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    • pp.133-134
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    • 2011
  • 고용없는 성장이 이루어지고 있는 가운데 청년실업과 기후변화, 세계경제의 극심한 불안은 새로운 경제성장 패러다임을 요구하고 있다. 이에 세계 각국은 녹색성장을 신성장 동력으로 주목하고 있다. 우리나라는 저탄소 녹색성장을 목표로 녹색인재양성을 통한 국가경쟁력 확보와 청년실업해소 및 일자리 창출을 도모하고 있다. 본 논문은 AHP 방법론을 통하여 녹색인재양성을 위한 국가정책과제의 우선순위를 도출하여, 효율적인 투자와 인재양성계획을 수립하도록 돕는다.

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The Growth Pattern Of R&D Activities With Innovation in the Digital Economy

  • Park, Chu-Hwan;Shin, Yong-Tae
    • Journal of Korea Technology Innovation Society
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    • v.5 no.1
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    • pp.16-25
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    • 2002
  • 그 동안 R&D와 관련된 많은 연구는 다양한 성장모형을 이용해 경제성장과 연구개발 투자사이의 관계를 보이는데 중점을 두어왔으나, 디지털 경제에서의 지식 혁신에 의한 R&D활동의 성장패턴을 보이는 연구는 이루어지지 않고 있다. 따라서 본 연구에서는 W기업의 생산과정에서 R&D활동에 따른 비중의 변화가 생산성을 증가시키는 성장의 패턴을 다양하게 할 수 있음을 보이고자 한다.

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PR Focus-고속성장이 예상되는 스마트폰시장

  • Korea Venture Business Association
    • Venture DIGEST
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    • s.58
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    • pp.9-9
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    • 2004
  • 최근 EE타임즈는 시장조사기관인 인스탯/MDR의 보고서를 인용해 스마트폰시장의 폭발적인 성장을 예상하였다. 가격하락과 크기축소 등의 복합적 요인으로 향후 5년간 연평균 44%의 판매증가로 스마트폰시장은 크게 성장할 것이라는 전망이다. 또 이 보고서는 앞으로 약 12~18개월 동안 가장 큰 변화가 나타날 것이라고 예상 하였다. PDA 및 스마트폰 전문업체인 싸이버뱅크와 필기인식 솔루션의 대표주자 디오텍. 이 두 업체는 대기업과 외국기업의 틈바구니에서도 어깨를 나란히 하며 곧 다가올 스마트폰시장의 고속성장을 준비중이다.

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The Growth Pattern of R&D Activities with Innovation in the Digital Economy

  • Park, Chuhwan;Shin, Yongtae
    • Proceedings of the Korea Technology Innovation Society Conference
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    • 2002.05b
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    • pp.19-33
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    • 2002
  • 그 동안 R&D와 관련된 많은 연구는 다양한 성장모형을 이용해 경제성장과 연구개발 투자사이의 관계를 보이는데 중점을 두어왔으나, 디지털 경제에서의 지식 혁신에 의한 R&D활동의 성장패턴을 보이는 연구는 이루어지지 않고 있다. 따라서 본 연구에서는 IT기업의 생산과정에서 R&D활동에 따른 비중의 변화가 생산성을 증가시키는 성장의 패턴을 다양하게 할 수 있음을 보이고자 한다.

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Dependance of hot-zone position on AlN single crystal growth by PVT method (PVT법에 의한 AlN 단결정 성장에서 Hot-Zone 의존성)

  • Yin, Gyong-Phil;Kang, Seung-Min
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.26 no.2
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    • pp.84-88
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    • 2016
  • AlN single crystals were grown by the PT (Physical vapor transport) method with position-changable induction coil. And the graphite crucible dimensioned ${\Phi}90{\times}H120$ was used on processing. The temperature was $1950{\sim}2050^{\circ}C$ and ambient pressure was 150~1 Torr. And the hot-zone was changed according to times on growing for result comparison. When hot-zone by coil is located below far enough (> 40 mm) from AlN crystal concentration position, the as-grown crystals physical size is better ($300{\mu}m/hr$) than another condition, but the condition-reproducibility was very poor. However the closer the distance between hot-zone and AlN growing posion, the smaller the size of as-grown crystal and the rarer the generation of the crystal nuclear, but the crystal growing condition is stable for quality. The best condition for both growth rate and quality is gained when the starting position of hot-zone coil is about 20 mm distance from growing position. For the best growth condition, the position of hot-zone is very sensitive factor and the further more the condition of speed of coil shift also must control.

Searching for Driving Forces in Construction Industry: Lessons Learned from Driving Forces in 6T Industries (건설산업 성장엔진 발굴을 위한 6T 산업 성장엔진 비교분석 연구)

  • Kim Han-Soo;Seo Hee-Jun
    • Proceedings of the Korean Institute Of Construction Engineering and Management
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    • autumn
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    • pp.398-401
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    • 2003
  • Along with rapid changes and increasing competitions of the global market, a country with advanced technology can gain competitiveness edges. The Korean government recently announced 'Strategic Plan for the Next Generation Driving Forces Industry' in order to respond this global challenges. However, it appears that the construction industry has been put out from the discussions. It can be argued that considering the size and contributions of the industry to the national economy, driving engines for the industry should be considered and identified. The objective of this paper is to propose the criteria of driving engines for the construction industry based on the analysis of the common characteristics of 6T industries' driving forces as recently announced.

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RF-Magnetron Sputtering을 이용한 $Cu_2O$ Rod 합성

  • Yu, Jae-Rok;Kim, Se-Yun;Jo, Gwang-Min;Kim, Jeong-Ju;Lee, Jun-Hyeong;Heo, Yeong-U
    • Proceedings of the Korean Vacuum Society Conference
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    • 2013.02a
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    • pp.475-475
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    • 2013
  • Cuprous oxide ($Cu_2O$)는 밴드갭이 2.17 eV p-type 산화물 반도체로써 태양에너지 변환기, photocatalysis (광촉매작용), 센서, 스위칭 메모리 등 응용이 다양한 재료이다. 산화물 반도체의 기본 특성은 나노/마이크로 범위 안에서 재료의 표면형태, 크기, 구조와 형상 공간방향등에 크게 영향을 받는다. 그렇기 때문에 원하는 $Cu_2O$ 특성을 얻기 위해서 성장 거동을 아는 것은 매우 중요하다. RF 마그네트론 스퍼터법으로 rod 성장 사례는 잘 알려지지 않았다. 그래서 RF 마그네트론 스퍼터법 $Cu_2O$ rod 형성 실험을 통하여 $Cu_2O$ 형성과 성장 거동을 알아보았다. RF 마그네트론 스퍼터법으로 $Cu_2O$ rod를 glass 기판 위에 Cu metal target을 이용하여 형성시켰다. $Cu_2O$ rod 합성을 위해 기판온도 및 산소분압 O2/(Ar+O2)=3%, 5%, 7% 증착시간 등을 변화시켜 실험하였다. 성장된 rod의 분석은 XRD, SEM으로 확인하였다. 성장 거동은 증착온도와 증착시간에 차이를 보였다. 증착온도 $550^{\circ}C$에서 rod가 생성되는 것을 관찰하였다. 증착시간이 길어질수록 rod 길이가 길어지고 일정 시간이 지나면 rod의 길이 성장보다는 두께(폭)가 성장하는 것을 확인하였다. 증착온도 $550^{\circ}C$ 그리고 산소분압 3%, 5%, 7% 조건에서 rod 합성 실험을 하였을 때 3%, 5% 조건에서 rod의 성장을 확인하였다. 이때 3%, 5% 산소분압에 따라 rod의 모양이 변화하였다. 하지만 7% 조건에서는 rod가 성장하지 않았다. 이유는 3%, 5%에서는 Cu metal peak을 확인하였지만, 7% 조건에서는 Cu metal peak이 없었다. 이로부터 Cu metal이 $Cu_2O$ rod 생성에 영향을 미치는 중요한 요소임을 예상할 수 있었다.

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Growth of Non-Polar a-plane ZnO Layer On R-plane (1-102) Sapphire Substrate by Hydrothermal Synthesis (저온 수열 합성법에 의해 (1-102) 사파이어 기판상에 성장된 무분극 ZnO Layer 에 관한 연구)

  • Jang, Jooil;Oh, Tae-Seong;Ha, Jun-Seok
    • Journal of the Microelectronics and Packaging Society
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    • v.21 no.4
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    • pp.45-49
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    • 2014
  • In this study, we grew non-polar ZnO nanostructure on (1-102) R-plane sapphire substrates. As for growth method of ZnO, we used hydrothermal synthesis which is known to have the advantages of low cost and easy process. For growth of non-polar, the deposited AZO seed buffer layer with of 80 nm on R-plane sapphire by radio frequency magnetron sputter was annealed by RTA(rapid thermal annealing) in the argon atmosphere. After that, we grew ZnO nanostructure on AZO seed layer by the added hexamethylenetramine (HMT) solution and sodium citrate at $90^{\circ}C$. With two types of additives into solution, we investigated the structures and shapes of ZnO nanorods. Also, we investigate the possibility of formation of 2D non-polar ZnO layer by changing the ratio of two additives. As a result, we could get the non-polar A-plane ZnO layer with well optimized additives' concentrations.

Suspended Time Dependent Meat Weight Increase of Oysters, Crassostrea gigas, in Pukman Bay, Korea (북만의 양식 참굴, Crassostrea gigas의 수하시기에 따른 육중량 변화)

  • 정우건;조상만;조창환
    • The Korean Journal of Malacology
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    • v.15 no.1
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    • pp.41-47
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    • 1999
  • From September 1994 to April 1996, we observed the suspending time dependant meat increase (dry weight) for oysters at Pukman Bay in Korea. The oysters which suspended in September increased to 5 g in meat weight (dry weight) by January. Ones in June increased rapidly but lessened during summer and this stagnation of meat increase extended to autumn. It took long time to compensate for the loss of meat weight owing to spawning. Oysters suspended in July or August showed low growth or stagnation due to the high water temperature and spawning activities after suspending. However, meat weight showed sudden increasement after December and achieved 5 g at the late farm period. The meat increase of oysters suspended in October or November was very slow during entire growing period. Most of them did not achieved 5 g during farm period. The negative correlation was observed between meat growth and water temperature in September. Also, there was a high correlation between meat growth and chlorophyll-a. It was believed that deficiency of food organisms in the water column lead slow growth in terms of meat growth, particularly right after transplanting seed oysters to the farm. Our study suggests that proper time for transplanting oysters is between August and mid-September. However, the data indicate that good growth of oysters is depending upon amount of food available in the water column.

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