• Restorative Dentistry and Endodontics
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• v.33 no.5
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• pp.419-427
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• 2008

This study analyzed the influence of dental adhesive/primer on the bond strength between indirect resin composite and the resin cement. Seventy disc specimens of indirect resin composite (Tescera Dentin, Bisco) were fabricated. And bonding area of all specimens were sandblasted and silane treated for one minute. The resin cements were used with or without application of adhesive/primer to bonding area of indirect resin restoration, Variolink-II (Ivoclar-Vivadent) : Exite DSC, Panavia-F (Kuraray) : ED-Primer, RelyX Unicorn (3M ESPE) Single- Bond, Duolink (Risco) : One-step, Mulitlink (Ivoclar-Vivadent) : Multilinh Primer. Shear bond strength was measured by Instron universal testing machine. Adhesive application improved shear bond strength (p<0.05) But Variolink II and Panavia-F showed no statistically significant difference according to the adhesive application. With the above results, when resin inlay is luted by resin cement it seems that application of dental adhesive/primer is necessary in order to improve the bond strength.

• Restorative Dentistry and Endodontics
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• v.36 no.5
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• pp.419-424
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• 2011

Objectives: This study was aimed to determine the effects of temporary sealing materials on microtensile bond strength between resin-coated dentin and resin inlay and to compare the bonding effectiveness of delayed dentin sealing and that of immediate dentin sealing. Materials and Methods: The teeth were divided into 4 groups: group 1, specimens were prepared using delayed dentin sealing after temporary sealing with zinc oxide eugenol (ZOE); group 2, specimens were prepared using immediate dentin sealing and ZOE sealing; group 3, specimens were prepared using immediate dentin sealing and Dycal (Dentsply) sealing; group 4, specimens were prepared using immediately sealed, and then temporarily sealed with a resin-based temporary sealing material. After removing the temporary sealing material, we applied resin adhesive and light-cured. Then the resin inlays were applied and bonded to the cavity with a resin-based cement. The microtensile bond strength of the sectioned specimens were measured with a micro-tensile tester (Bisco Inc.). Significance between the specimen groups were tested by means of one-way ANOVA and multiple Duncan's test. Results: Group 1 showed the lowest bond strength, and group 4 showed the highest bond strength (p < 0.01). When temporary sealing was performed with ZOE, immediate dentin sealing showed a higher bonding strength than delayed dentin sealing (p < 0.01). Conclusions: Based on these results, immediate dentin sealing is more recommended than delayed dentin sealing in bonding a resin inlay to dentin. Also, resin-based temporary sealing materials have shown the best result.

• Korean Business Review
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• v.6
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• pp.181-199
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• 1993

이제까지 부활된 정기시장인 원주시 쌍다리 풍물시장의 현황을 관찰, 면담, 설문지를 통하여 많은 문제점과 나름대로의 대안을 살펴보았다. 여러 가지 문제해결의 요소들이 복잡하게 얽혀 있는 쌍다리 풍물시장의 활성화 방안을 살펴보기에 앞서 풍물시장의 이해 관계자들을 살펴보기로 하자. 쌍다리 풍물시장의 이해관계자는 크게 4가지 부류로 나눌 수 있다. 첫째로, 상설상인들을 들 수 있다. 이들은 거리에서 노점상을 했던 도시빈민들이 대부분이며, 설문지에서 나타나듯이 낮은 학력, 소자본 그리고 노령인구층과 여자의 비율이 높다. 이들은 두 가지에 큰 관심을 가지고 있는데, 매장의 소유권과 5일장이다. 매장의 소유권은 이들에게 있어서 큰 희망이며, 5일 장날의 매상은 평소의 $5{\sim}6$배를 웃돌고 있기 때문이다. 또한 풍물시장 번영회라는 그들의 이익을 대변할 수 있는 단체를 구성하고 있으며 이러한 풍물시장 번영회는 상설상인들의 이익을 도모할 수 있는 여러 노력들을 하고 있다. 둘째로는 이동상인들을 들 수 있다. 이들은 장터를 떠돌아 다니며 상행위를 하는 부류로서 상설상인에 비해 상대적으로 고학력과 장년층이 많다. 이들은 5일장의 성쇄와 깊은 관련이 있으나, 5일장이 열리는 상설시장의 발전에는 아무런 흥미가 없다. 즉, 이동상인이 많이 모여드는 곳은 5일장이 크게 번창하지만, 그곳의 장이 패할 기미가 보이면 미련 없이 떠난다. 따라서 보다 많은 이동상인의 유치는 도시 5일장의 성쇄와 깊은 관련이 있다. 셋째로는 시당국을 들 수 있다. 시당국에 의해서 쌍다리 풍물시장은 노점단속에 반발하는 노점상들에 대응하기 위하여 생겨났으며, 5일장 역시 시당국에 의해서 부활된 것이다. 그러나 단기적인 측면만을 고려한 듯한 인상을 풍기는 쌍다리 풍물시장에 대한 행정은 대단히 아쉬운 부분이며 앞으로도 여러 가지 구조적인 문제점의 해결은 시당국에 달려있다고 해도 과언이 아니다. 즉, 풍물시장에 관련된 이해관계자들 중 유일하게 조직과 행정력을 가지고 문제해결을 할 수 있는 주체인 것이다. 넷째로는 풍물시장을 이용하는 소비자를 들 수 있다. 이들은 주로 원주에 살고 있는 사람들이 대다수이며 쌍다리 풍물시장을 이용하는 이유는 저렴한 가격에도 원인이 있지만 민족의 정서가 어려있는 시골장터에 대한 향수 역시 큰 원인으로 꼽을 수 있다. 이러한 점은 소비자 설문에서 구경거리를 위하여 장에 오는 소비자의 비율이 생각 외로 높게 나타남으로써 알 수 있다. 미국을 위시한 선진국들의 시장개방 압력과 우루과이라운드의 등장으로 우리나라는 경제, 사회문화적인 위기에 봉착해 있다. 1960년대 이후 계속되어 온 경제 제일주의 정책으로 우리 민족의 정서와 문화를 보존하는 일에 등한시하여 왔다. 이 때문에 우리 민족 고유의 뿌리를 점차 잃어가고 있다. 이러한 시점에서 도시노점상을 정리하기 위한 목적으로 정부에서 도시 5일장을 개장한 것은 역사의 아이러니라 아니할 수 없다. 이렇게 정부주도로 개장된 5일장이 운영되어 온 지 2년이 되어가고 있다. 개장 초기에는 시에서의 지원도 적극적이고 소비자들의 호응도 좋았으나, 최근에 들어 활성화의 속도가 둔화되면서 도시 5일장의 개념을 재정립할 필요성이 제기되고 있다. 정부의 주도로 시작된 5일장이므로 정부의 적극적인 추진하에 풍물시장 번영회와 활성화 방안을 모색해야 한다. 쌍다리 풍물시장의 5일장을 활성화하기 위하여 도시 5일장의 개념을 ${\ulcorner}$국민들의 생활수준이 향상되고 여가를 즐길 수 있는 여건이 형성되고 있으므로 전통문화(향토문화)를 유지하고 시민들의 정서함양에 기여할 수 있는 여가공간 조성${\lrcorner}$으로 규정해야 한다. 이러한 개념 하에 5일장의 주체를 명확히 하기 위해 시청 지역경제과를 중심으로 지자제의 실시에 발맞춰 지역특색에 맞게 5일장을 활성화하기 위한 전학을 수립해야 한다. 서울대형백화점인 롯데 슈퍼백화점이 송파 큰장터나 그랜드 백화점의 향토물산전의 성공은 도시 5일장의 활성화 가능성을 미루어 짐작할 수 있다.

• Korean Journal of Plant Resources
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• v.21 no.1
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• pp.1-4
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• 2008

The clonal variation in female flowering was studied in Larix leptolepis clone bank, consisting of 116 clones, for three years. The between-year variation was large; i.e. the percentage of flowering grafts and average number of flowering per graft were $28.4{\sim}67.2$ and $9{\sim}176$, respectively. Differences in flowering abundance among clones were large and statistically significant in all the years studied. The variance of flowering abundance among clones was increased when flowering was poor. The average of broad-sense heritability of flowering abundance was 0.52. The genetic gain(%G) was estimated at 57.4% when the upper 30% clones were selected. The clonal stability of flowering abundance was compared using average number of flowering and coefficient of variance value of each clone. The clones such as Gyeonggi 9(29), Kangwon 37(137), Chungnam 6(46), Chungnam 14(414), R11, R8 showed abundant flowering and high stability.

• Restorative Dentistry and Endodontics
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• v.33 no.2
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• pp.148-161
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• 2008

The purpose of this study was to evaluate the effect of chlorhexidine (CHX) on microtensile bond strength (${\mu}TBS$) of dentin bonding systems. Dentin collagenolytic and gelatinolytic activities can be suppressed by protease inhibitors, indicating that MMPs (Matrix metalloproteinases) inhibition could be beneficial in the preservation of hybrid layers. Chlorhexidine (CHX) is known as an inhibitor of MMPs activity in vitro. The experiment was proceeded as follows: At first, flat occlusal surfaces were prepared on mid-coronal dentin of extracted third molars. GI (Glass Ionomer) group was treated with dentin conditioner, and then, applied with 2 % CHX. Both SM (Scotchbond Multipurpose) and SB (Single Bond) group were applied with CHX after acid-etched with 37% phosphoric acid. TS (Clearfil Tri-S) group was applied with CHX, and then, with adhesives. Hybrid composite Z-250 and resin-modified glass ionomer Fuji-II LC was built up on experimental dentin surfaces. Half of them were subjected to 10,000 thermocycle, while the others were tested immediately. With the resulting data, statistically two-way ANOVA was performed to assess the ${\mu}TBS$ before and after thermo cycling and the effect of CHX. All statistical tests were carried out at the 95 % level of confidence. The failure mode of the testing samples was observed under a scanning electron microscopy (SEM). Within limited results, the results of this study were as follows; 1. In all experimental groups applied with 2 % chlorhexidine, the microtensile bond strength increased, and thermo cycling decreased the micro tensile bond strength (P > 0.05). 2. Compared to the thermocycling groups without chlorhexidine, those with both thermocycling and chlorhexidine showed higher microtensile bond strength, and there was significant difference especially in GI and TS groups. 3. SEM analysis of failure mode distribution revealed the adhesive failure at hybrid layer in most of the specimen. and the shift of the failure site from bottom to top of the hybrid layer with chlorhexidine groups. 2 % chlorhexidine application after acid-etching proved to preserve the durability of the hybrid layer and microtensile bond strength of dentin bonding systems.

• (The) Research of the performance art and culture
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• no.36
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• pp.505-530
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• 2018

The purpose of this study is to examine the meaning of learning methods for education to transmit the items designated as intangible cultural heritages focusing on Seoul-gut. Recently, as the Act on the Preservation and Promotion of Intangible Cultural Heritages was promulgated, 'the archetype' instead of 'the prototype' has become highlighted as a crucial axis for transmission. Although there are some controversies over the definition of the archetype among scholars, it is now possible for transmitters to make use of transformations rather freely being freed from strict orientation to the prototype to follow some fixed frame. Examining learning methods used in education to transmit mudang-gut, one of the items designated as intangible cultural heritages, however, this author has found that the prototype is still emphasized or in the center of learning instead. Presenting learning methods employed for Hwanghaedopyeongsansonoreum-gut of a national intangible cultural heritage, Namijanggunsadang-gut of Seoul Special City's intangible cultural heritage, and Bonghwasandodang-gut as examples, this researcher intends to reveal the reality. In the recent situation that education centering around academies is being widely spread to transmit mudang-gut, setting forth the designation of some of the items as intangible cultural heritages, they are publishing articles on newspaper as an advertisement to encourage learning about mudang-gut. Responding to the advertisement, there are more and more shamans intending to learn mudang-gut coming to the society for preserving items designated as intangible cultural heritages. They can, of course, perform mudang-gut on their own but come to learn it as there is no fixed or definite system for it. Even though the concept of the archetype was introduced, as now it is possible to learn the fixed frame through learning about the prototype regarding the item of mudang-gut as an intangible cultural heritage, those involved in shamanism are coming to it more and more. As transmitting the prototype rather deteriorated the liveliness of gut, those involved in shamanism are coming to it to learn about gut thinking that it is where they can learn the basic frame and also acquire more detailed knowledge about shamanism. Therefore, it is needed for the item of mudang-gut designated as an intangible cultural heritage to accept the aspects of change and develop new methods of education to transmit intangible cultural heritages.

• The Korean Journal of Air & Space Law and Policy
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• v.23 no.2
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• pp.67-92
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• 2008

The purpose of this paper is to research the requirements and effect of the document of carriage in respect of the carriage of cargo by air under the Montreal Convention of 1999, IATA Conditions of Carriage for Cargo, and the judicial precedents of Korea and foreign countries. Under the Article 4 of Montreal Convention, in respect of the carriage of cargo, an air waybill shall be delivered. If any other means which preserves a record of the carriage are used, the carrier shall, if so requested by the consignor, deliver to the consignor a cargo receipt. Under the Article 7 of Montreal convention, the air waybill shall be made out by the consignor. If, at the request of the consignor, the carrier makes it out, the carrier shall be deemed to have done so on behalf of the consignor. The air waybill shall be made out in three original parts. The first part shall be marked "for the carrier", and shall be signed by the consignor. The second part shall be marked "for the consignee", and shall be signed by the consignor and by the carrier. The third part shall be signed by the carrier who shall hand it to the consignor after the goods have been accepted. Under the Article 5 of Montreal Convention, the air waybill or the cargo receipt shall include (a) an indication of the places of departure and destination, (b) an indication of at least one agreed stopping place, (c) an indication of the weight of the consignment. Under the Article 10 of Montreal Convention, the consignor shall indemnify the carrier against all damages suffered by the carrier or any other person to whom the carrier is liable, by reason of the irregularity, incorrectness or incompleteness of the particulars and statement furnished by the consignor or on its behalf. Under the Article 9 of Montreal Convention, non-compliance with the Article 4 to 8 of Montreal Convention shall not affect the existence of the validity of the contract, which shall be subject to the rules of Montreal Convention including those relating to limitation of liability. The air waybill is not a document of title or negotiable instrument. Under the Article 11 of Montreal Convention, the air waybill or cargo receipt is prima facie evidence of the conclusion of the contract, of the acceptance of the cargo and of the conditions of carriage. Under the Article 12 of Montreal Convention, if the carrier carries out the instructions of the consignor for the disposition of the cargo without requiring the production of the part of the air waybill or the cargo receipt, the carrier will be liable, for any damage which may be accused thereby to any person who is lawfully in possession of that part of the air waybill or the cargo receipt. According to the precedent of Korea Supreme Court sentenced on 22 July 2004, the freight forwarder as carrier was not liable for the illegal delivery of cargo to the notify party (actual importer) on the air waybill by the operator of the bonded warehouse because the freighter did not designate the boned warehouse and did not hold the position of employer to the operator of the bonded warehouse. In conclusion, as the Korea Customs Authorities will drive the e-Freight project for the carriage of cargo by air, the carrier and freight forwarder should pay attention to the requirements and legal effect of the electronic documentation of the carriage of cargo by air.