• Journal of Conservation Science
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• v.25 no.2
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• pp.171-178
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• 2009

When we considered the superior ability of the semi-water soluble urethane 1st transcription and final epoxy products, the stability for moving historic sites depend on physical properties and the peel off state of separation media. In this paper, we synthesised three type of water-borne epoxy solution without using a surfactant, and investigated the peel off state, physical properties, and the state between urethane surface and epoxy surface after exfoliation. The life time of water-borne separation media is over the 60 days. When it is used the 30% solution of water-borne separation media, it made good separation of urethane pre-products surface and epoxy final product surface and no color change. The separation tension pressure is about 15~50 kg/$cm^2$ and there is no surface whitewash phenomenon. We suggest that this water-borne epoxy will be best material as separation media of low viscosity type.

• Journal of Conservation Science
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• v.32 no.1
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• pp.63-73
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• 2016

This study defined material and characteristics of 24 glass fragments and 26 whole glass beads. The feature of glass beads shape are divided into 5 types following color, size, weathering condition and manufacturing techniques. Through the chemical composition, the first and second type is soda glass, the third type is potash glass, the fourth and fifth type is lead barium glass. This site showed the aspect that the chemical composition is changed according to the feature of glass shape and was found that various chemical compositions. Looking at the flow of glass culture, the tomb that are lead barium glass IItype and potash glass I, IItype is relatively preceding period and the tomb that are soda glass and lead barium glass IIItype is following period.

• Journal of the Korean Society of Propulsion Engineers
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• v.6 no.2
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• pp.37-44
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• 2002

A theoretical study of spray and combustion characteristics due to coaxial twin-fluid injection is conducted to investigate the effects of liquid jet property, droplet size, contact length and liquid jet velocity. Model is properly validated with measurements and shows good agreement. Prediction of jet contact length, droplet size, liquid jet velocity reflects genuine features of coaxial injection in physical and practical aspects. Both the jet contact length and tile droplet size are reduced in a linear manner with an increase of injector diameter. Cross sectional area of liquid intact core is reduced with augmented jet splitting rate, thus the jet is accelerated to maintain the mass continuity and with an assistant of momentum diffusion by burnt gas.

• Journal of Korean Society of Archives and Records Management
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• v.19 no.4
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• pp.175-209
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• 2019

This study aims to analyze the distribution of authorities and responsibilities (ARs) to appraise public records, especially between national archives and central or federal government institutions. For this study, archives acts and policies of Britain, the USA, Canada, and Australia were selected for analysis. After attempts in reviewing the laws and policies governing ARs of appraisal and disposition, their level of concentration were investigated and compared. The analysis shows that the ARs to determine and approve which records have archival value and what are to be transferred to archives are mainly located in the national archives. In comparison, it is common that the national archives and government institutions share ARs in identifying the public records and in preparing and approving the disposal authorities. Furthermore, it identifies that the ARs can be distinguished by individual appraisal activities and expects to be used to discuss the ARs to appraise public records in Korea.

• Proceedings of the Korean Information Science Society Conference
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• 1999.10b
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• pp.333-335
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• 1999

일반적으로 자기구성 지도에서는 구조가 초기에 결정되어 학습이 끝날때까지 변하기 않기 때문에 각 문제에 대한 구조를 반복된 실험을 통해서 최적화시켜야 한다. 그러나, 지도의 구조가 학습중에 적절하게 변경된다면, 해당 문제에 가장 알맞은 구조의 지도를 생성할 수 있을 것이다. 이 논문에서는 기존의 적응형 자기 구성 지도의 비교사 학습방법에 LVQ 알고리즘을 이용한 교사 학습방법을 결합한 구조 적응형 자기 구성 지도 모델을 제안한다. 이 방법은 일반적인 자기구성 지도 알고리즘보다 작은 수의 노드를 가지고 높은 성능을 보일 뿐만 아니라, 자기 구성 지도의 특성인 위상 보존도 잘 이루어진다. 오프라인 필기 숫자 데이터로 실험한 결과, 제안한 방법이 유용함을 알 수 있었다.

• Proceedings of the Korea Water Resources Association Conference
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• 2009.05a
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• pp.953-956
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• 2009

본 연구는 농업용저수지유역을 대상으로 분포형 강우-유출모형을 적용해 봄으로서 차후 본 연구대상유역의 분포형 강우유출모형을 이용한 설계홍수량 산정에 활용해 보기 위한 사전연구이다. 농업용저수지유역을 대상으로 모의하기 위하여 자동수위계를 통하여 저수지 수위자료가 주기적으로 기록되고 있는 계룡저수지 유역($15.4km^2$)을 선정하였으며, 주요 공간매개변수는 30m 격자해상도로 구축하였다. 관측유량자료는 수위-내용적-방류량 관계곡선에 의하여 수위변화에 따른 내용적 변화량을 유입량으로 가정하여 환산토록 하였으며, 곡선의 진동이 다소 작고 상태가 양호한 3개 강우사상을 대상으로 분석하였다. 대상유역의 2개 강우관측소(복룡, 반포)의 강우량을 IDW 방법에 의해 공간분포시켜 적용하였으며, 모형의 분석결과, 결정계수($R^2$)는 평균0.88, 용적보존지수(VCI)는 평균 0.14, 첨두유량의 상대오차 ($EQ_p$)는 평균 $0.11m^3/s$로 분석되었다.

• Proceedings of the Korea Society for Simulation Conference
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• 1997.04a
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• pp.115-119
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• 1997

본 논문은 해상에서 발생될 수 있는 기름 유출 사고시 효과적 방제의 지원을 위한 오염원 확산 예측 시스템의 개발을 주목적으로 한다. 이를 위하여, 격자형 공간 DEVS 모델 링 방법론을 이용한 SOS(Save Our Sea) 시스템을 개발하였다. 기존의 해양오염 예측 시스 템들이 대부분 해석적 기법에 의존하는데 비해 제안된 시스템은 격자형 공간 모델링을 이용 한 시뮬레이션 기법으로서 전체 해양을 Cell 단위의 공간으로 분할하고, Cellrks의 결합관계 는 Name-Directed Coupling을 적용함으로서 시스템 설계상의 효율성과 유연성을 제공한 다. 제안된 시스템은 기름유출사고의 발생시 오염원 확산에 영향을 주는 각종 벡터 변수값 들에 따른 해양 오염 물질의 확산 분포를 예측함과 동시에 확산에 영향을 주는 많은 벡터 값들이 모니터링 정보를 함께 제공함으로서 해양 오염 방제 및 환경 보존에 효과적으로 적 용될 수 있을 것으로 기대된다.

• Korean Journal of Heritage: History & Science
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• v.55 no.1
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• pp.51-61
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• 2022

Earthenware horn cups with horse head decorations were excavated from Tomb No. 7 of Bokcheon-dong, Dongraegu, Busan Metropolitan City. Made of earth in the shape of a horn, these cups are considered to have been used to drink alcohol or beverage. Large numbers of earthenware horn cups of various shapes were excavated from tombs located in the old territories of Silla and Gaya. A pair of earthenware horn cups were excavated from Tomb No. 7, and the two cups are almost identical in overall shapes and manufacturing techniques despite different sizes. Conservation treatment was carried out for the bigger one of the two horn cups this time. There are two cracks toward the horse head decorations around the mouth with missing parts observed. The chest of the horse touches the ground with one side decorating the horse head and the other side facing the conical mouth of the horn cup. It is in the U shape, striking a balance based on two legs attached behind. The surface of the horn cup was made with a potter's wheel, and the connection to the horse head has traces of cutting and trimming. The horse head is expressed realistically with its features including the ears, eyes, nose, and mouth well apprehended and its color is grey This study intended to investigate manufacturing techniques of the artifact by examining its internal structure through the condition survey in a non-destructive way. CT imaging was used to figure out its manufacturing techniques and to diagnose its condition, and accordingly the scientific conservation treatment was conducted to stabilize the artifact. The precise diagnosis on conservation condition found that there are two chips in the spout with their cracks extended. One of the chips is connected with separation added to the crack. The material which has been used for connection in the past was collected for the infrared spectroscopic analysis, which was identified to be nitrocellulose resin for the connection. Therefore, this conservation treatment focused on removing the old material and preventing the spread of cracks. Before conservation treatment, the condition survey and scientific examination for the artifact were carried out to secure data about the earthenware horn cup with horse head decorations(Treasure). Based on them, effective plans for its conservation treatment was sought for and then existing adhesive was safely removed, and restoration material was selected to take into account its reversibility. In addition, the conservation treatment according to optimal methodologies was conducted through the consultation meeting with experts.

• Journal of Conservation Science
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• v.31 no.3
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• pp.255-265
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• 2015

In this study, the potash glass beads of 281 samples in 30 sites analyzed until now were classified according to the chemical composition. And the color, size, manufacturing technique and distribution period were compared. Korea potash glass beads are divided into 3 types depending on the stabilizer content. I, II type is the CaO and $Al_2O_3$ content of less than 5%. Relatively, I type has a high CaO and II type has a high $Al_2O_3$. In contrast, III type comprises more than CaO 5%. I, II type is the saltpetre, III type is estimated using plant ash as row material of flux. A review of the properties by type, I type is cobalt blue, copper blue and purple beads. The outer diameter is sized to the range 1.4~7.4mm. Also it was produced by the drawing technique. It was used continuously from BC 1C until around AD 6C. On the other hand, II type is outer diameter of 1.9~3.6mm and a copper blue beads. manufacturing technique is the same as the I type. This seems to have been in use since around AD 1C to 4C. Finally, III type is brown, colorless, amber beads and an outer diameter of about 10mm. It was formed by winding technique and appeared in the tombs of Goryeo and Joseon Dynasty. As a result, 3 types of potash glass beads distributed in Korea is likely to flowing through the various trade routes from different provenances.

• Journal of Korean Society of Forest Science
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• v.18 no.1
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• pp.17-22
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• 1973

Using of zymography for identification of same clone of Pinus densiflora, the two year old needle leaves of 48 ramtes including 8 clones (6 ramets per clone) were collected in the clone bank which has been established on the near campus of Institute of Forest Genetics, Suwon, in 1962. All 8 bands are named from cathod to anode, G, H, K, M, N, Q, S and Y. Only CB-1 clone shows all bands, while KW-3 clone reveals only 5 bands. Other 6 clones were found 7 bands but the occurred frequencies of those bands are variable among those clones. Though the grafting stock are used various individuals grown seed propagation of P. densiflora, moreover, three stocks have been different species and that one has been P. rigida and two individuals have been P. koraiensis, the zymograms of the ramets belonging to the same clone reveals the identified patterns. The results show that the stocks for grafting have not been affected on the isoperoxidase patterns of their scions in P. densiflora. Among 48 ramets of 8 clones, 4 ramets are found the different isoperoxidase patterns from that of the remained rametes within same clone. Thus, it is conluded that zymography is useful for testing genuineness of the grafted clones of P. densiflora.