• Environmental and Resource Economics Review
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• v.18 no.2
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• pp.173-190
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• 2009

Although renewable energy sources are more environmentally friendly than fossil energy sources, they are far more costly and hard to survive in the electricity market. For a competitive renewable electricity, the government should take 'visible' actions to compensate higher production costs. Popular policies, such as Feed-In-Tariff and Renewable Portfolio Standards, are financed by an undifferentiated increase of electricity bills (a collective financing mechanism) but are occasionally confronted with the opposition of the electricity consumers. This paper discusses the consumers' willingness to pay for renewable energy in order to back up the voluntary financing mechanism, the Green Pricing. The Tobit analysis of a consumer survey shows that the consumer's WTP is positively influenced by his environmentally friendly activities under both financing mechanisms. The knowledge on renewable energy is statistically significant only under collective financing mechanism.

• The Journal of Korean Academy of Prosthodontics
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• v.35 no.3
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• pp.535-543
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• 1997

In order to compare the accuracy of impression technique using the addition silicone putty and improved heavy body material, impression were taken for the natural 6 maxillary anterior teeth, and for the metal mast model that has full arch shape with 4 cylindrical abutment teeth. Marginal gingiva was retracted by routine method using retraction cord, and two techniques were tried to compare the length of impression materials in the gingival sulcus. This was aimed to see the effect of viscosity and hydraulic pressure of impression materials for the subgingival impression. Impressions for the full arch-shaped metal master model were taken to compare the linear stability of the different impression materials and their related techniques. The conclusions were as belows : 1. The one-step impression technique showed longer extension of impression material in gingival sulcus than two-step impression technique. 2. High viscosity and hydraulic pressure of impression material were useful to take subgingival impression. 3. There was no statistically significant difference for the two-dimensional accuracy of impression technique, but two-step technique showed better trend than one-step technique.

• Journal of Dental Rehabilitation and Applied Science
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• v.31 no.3
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• pp.221-230
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• 2015

Recently, traditional impression has been rapidly replaced by digital impression using intraoral scanning. There are more than 7 types of intraoral scanners available in the dental market. It is difficult to make effective strategic choices due to a lack of standards and guidelines for optimal intraoral scanning devices. So far, little has been reported about evaluating the ergonomic aspect of these scanners. This literature review compares current intraoral scanning systems based on different types of handles and suggests the most comfortable, user-friendly intraoral scanners from an ergonomic standpoint.

• 월간 기계설비
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• no.7 s.216
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• pp.36-39
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• 2008

원유와 고철 등 국제 원자재 가격 상승으로 지난 달 원재료 물가가 80% 가까이 폭등하며 28년만에 최고치를 기록함에 따라 건설현장의 자재비와 연료비 부담은 더욱 가중될 것으로 전망된다. 특히 철, 동 등의 금속재 가격 상승의 영향으로 철강재, 비철금속 가격이 연말 대비 40% 이상 폭등하였고, 지난 해 말부터 오르기 시작한 강관이 5월까지 계속 오르고만 있다. 그리고 앞으로도 더 오를 것이라는 전망이다. 이처럼 하루가 다르게 값이 오르고 있는 자재를 제때 구매하지 못해 공사현장은 지금 아우성이다. 철강재와 PVC제품을 주자재로 사용하고 있는 설비건설업계는 공사원가 부담 가중으로 심각한 위기에 직면해 있다. 이에 따라 대한설비건설협회는 자재값 인상에 대한 대처방안으로 여러 가지 방안을 강구, 추진하고 있다.

• The Journal of Korean Academy of Prosthodontics
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• v.46 no.2
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• pp.185-192
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• 2008

Purpose: This study was designed to investigate the fitness of adjustable dental impression trays on the Caucasian and African American. Material and methods: The size and shape of these trays were designed from the results of the dental arch size of Korean adults. Tray samples were made by CAD-CAM working. Sixty Caucasian (male:30, female:30) and sixty African American (male:30, female:30) were selected for taking irreversible hydrocolloid impression using these trays. The author measured the width and length of impression material on the several measuring points. Results: 1. Uniform impression material width was achieved by controling the width of the tray using stops and beveled guides. 2. In the maxillary tray on the Caucasian, the impression material thickness was measured to be rather great showing thickness of the midpalatal part 13.0 mm. 3. In the maxillary tray on the African American, the impression material thickness was measured to be rather great showing thickness of the midpalatal part 12.0 mm, posterior palatal part 11.0 mm and the labial frenum width was 11.0 mm. 4. In the maxillary tray on the African American, the impression material width of posterior border (0.8 mm) was measured to be small. 5. In the mandibular tray on the Caucasian, the impression material width was measured (2.7-6.7 mm) and posterior border width (2.1 mm) was measured small. The impression material length was measured (2.8-6.7 mm). 6. In the mandibular tray on the African American, the impression material width was measured to be rather great showing width of the labial frenum 9.2 mm and the width of posterior border was measured too small (0.3 mm). Conclusion: This adjustable dental tray shows good accuracy to Korean because it was designed by the analysis of the dental arch size of Korean adult model. With this result, it can be applied to Caucasian and African American, we can take more easy and accurate dental impressions.

• Monthly Korean Chicken
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• s.126
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• pp.84-88
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• 2005

필자가 담당하고 있는 충청지역에서 지난 여름과 가을에 걸쳐 조사한 바에 의하면 육계사육시 깔짚으로 왕겨를 사용하는 농가가 85% 정도였으며 이들 왕겨를 깔짚으로 사용하는 농장의 68% 정도가 깔짚을 최소 2회 이상 연속 사용하고 있는 것으로 나타났다. 나머지 8%의 농장이 톱밥을 사용하고 있었으며 톱밥을 깔짚으로 사용하는 농장의 99%가 2회 이상 깔짚을 재사용하고 있었다. 일부 농장의 4%는 왕겨와 볏짚을 혼합 사용하는 농장이 있었으며 왕겨와 볏짚을 혼합해서 사용하는 농장의 50% 정도가 깔짚을 재사용하고 있었다. 볏짚만 사용하는 농장도 있었으나 깔짚을 재사용하지는 않았다. 육계사육에서 깔짚을 연속 사용하는 이유는 현실적으로 뚜렷하게 대두되고 있는 상황이지만 그에 대한 변화된 사양관리는 뚜렷하게 정립된 내용이 없어서 사육성적이 문제가 되고 있다. 특히 올 겨울에는 유류가격 인상으로 인한 환기량이 감소될 우려가 있고 병아리 가격이 생산비 이하로 형성되면서 병아리 품질문제가 발생할 수 있으며 깔짚 연속 사용으로 인한 계사내부 환경불량 등 세 가지 요인에 의해 질병발생이 높아질 것으로 예상되고 생산성이 극도로 나빠질 것으로 우려된다. 따라서 필자는 올 겨울에 깔짚을 연속사용 할 때 어떤 방법으로 사육을 해야 정상적인 사육성적이 나올 수 있을 것인지 몇 가지 주요 핵심사항만 본고를 통해서 점검함으로써 여러분의 사육성적 향상에 도움이 되고자 한다.

• 프린팅코리아
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• s.26
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• pp.82-87
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• 2004

"카피와 프린트 문화를 올바르게 보급함과 동시에 회원사들의 권익을 보호하고 대변하는 단체로 거듭나는 것이 협회의 가장 큰 목적입니다." 백국인(48) 카피엔프린팅협회(www.cnp.or.kr, 이하 협회)회장은 협회의 존립 목적에 대해 궁극적으로는 저작.출판권의 존중이라고 강조한다. 또한 회원사뿐만 아니라 업계의 공동 발전을도모하는 공동체라고 말한다. 백 회장은 우수한 성능의 C&P호가 정박하기 좋은 항구를 찾기 위해서는 무엇보다도 결속력이 중요하다고 말했다. 1989년에 설립된 한학문화(www.hanhak.co.kr) 대표이사로 재임중인 백 회장의 고향은 경북 상주. 지난해 서대문 경제인상과 서울상공회 회장상을 수상한 바 있으며 이화여대 장학회 이사로 활동중이다. 재임 기간 1년여의 소회와 향후 계획에 대해 들어본다.

• The tire
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• s.228
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• pp.30-33
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• 2006

우리나라는 세계5위의 타이어생산국으로 국내 타이어시장은 2010년까지 생산과 수요는 증가할 것이지만 성장률은 연평균3% 이내로 정체될 전망이다. 세계 타이어시장 성장률도 3% 수준에서 정체될 것으로 보이는 상황에서 천연고무 가격급등, 유가인상 등으로 경영환경이 악화되고 있으며 , 이를 극복하기 위해 국내외 타이어업체들은 마진율이 높은 고부가타이어의 매출비중을 적극적으로 확대하고 있는 상황이다. 세계 타이어시장은 상위 12개 업체가 과점하고 있으며, 같은 성능과 품질이라도 브랜드파워와 판매네트워크의 차이로 뚜렷한 가격 차이를 보이고 있다. UHPT의 경우 국내업체제품은 선진업체에 비해 40% 할인된 가격에 판매되지만 , 일반타이어를 중심으로 가격차이가 2010년까지 15% 이내로 좁혀질 전망이다.

• The Journal of Korean Academy of Prosthodontics
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• v.60 no.2
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• pp.202-210
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• 2022

Recently with the advance in digital dentistry, the fabrication of dentures using computer-aided design and computer-aided manufacturing (CAD-CAM) is on the rise. The denture designed through a CAD software can be produced in a 3-dimensional manufacturing process. This process includes a subtractive processing method such as milling and an additive processing method such as 3D printing and in which it can be applied efficiently in more complex structures. In this case, complete dentures were fabricated using Stereolithography (SLA)-based 3D printing to shorten the production time and interval of visits in patient with physical disabilities due to cerebral infarction. For definitive impression, the existing interim denture was digitally replicated and used as an individual tray. The definitive impression obtained with polyvinyl siloxane impression material was including information about the inclination and length of the maxillary anterior teeth, vertical dimension, and centric relation. In addition, facial scan data with interim denture was obtained so that it can be used as a reference in determination of the occlusal plane and in arrangement of artificial teeth during laboratory work. Artificial teeth were arranged through a CAD program, and a gingival festooning was performed. The definitive dentures were printed by SLA-based 3D printer using a FDA-approved liquid photocurable resin. The denture showed adequate retention, support, and stability, and results were satisfied functionally and aesthetically.

• The Journal of Korean Academy of Prosthodontics
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• v.51 no.4
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• pp.323-331
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• 2013

Soft tissue collapse around prepared teeth and pontic is inevitable after removal of the provisional restoration during the impression taking procedures. When inserting gingival retraction cord, soft tissue is displaced to an undesired contour. Viscosity of impression material also causes gingival displacement. Therefore, the consideration to transfer the prosthetically contoured soft tissue to master cast is required, especially in the esthetic area. In this report, the methods to maintain the soft tissue contour and transfer to the mastercast will be introduced. Harmonious contour of the soft tissue can be achieved with provisional restoration and be transferred to the master cast with two different techniques mentioned in this case report.