• 한국정보통신학회논문지
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• 제11권7호
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• pp.1318-1324
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• 2007

지금까지의 상품 검색 방법으로는 찾고자하는 정보를 검색할 때 주로 단어의 빈도수나 어휘 정보를 이용하는 키워드 기반의 검색이 주로 쓰이고 있었다. 키워드 기반의 검색에서는 사용자의 질의와 관련이 없는 문서들까지도 같은 결과로 나타내 주고 이로 인해 사용자는 제시된 결과를 한번 더 수동적으로 검색해야하는 부담을 않게 되었다. 이러한 문제점을 해결하기 위해 온톨로지가 대두되었다. 본 논문에서는 온톨로지를 이용한 상품 검색 시스템을 직접 구축하여 분류별 검색을 통해 얼마나 정확한 검색을 하는지 실험하였다. 실험을 위해 전국적으로 On/Off라인 할인점을 운영 중에 있는 A할인점의 상품 데이터 약 40,000여개를 데이터 베이스로 구축하였고 User Interface 개발환경은 JSP와 PowerBuilder9.0을 사용하여 검색 시스템을 개발하여 실험하였다. 그 결과 본 논문에서 제안하고 설계한 상품 도메인 온톨로지를 이용한 검색 방법이 기존의 기반의 검색 방법보다 우수한 결과를 나타내고 있음을 입증하였다.

• 대한금속재료학회지
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• 제49권11호
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• pp.845-852
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• 2011

The Spark Plasma Sintering(SPS) method offers a means of fabricating a sintered-body having high density without grain growth through short sintering time and a one-step process. A titanium compact having high density and purity was fabricated by the SPS process. It can be used to fabricate a Ti sputtering target with controlled parameters such as sintering temperature, heating rate, and pressure to establish the optimized processing conditions. The compact/target(?) has a diameter of ${\Phi}150{\times}6.35mm$. The density, purity, phase transformation, and microstructure of the Ti compact were analyzed by Archimedes, ICP, XRD and FE-SEM. A Ti thin-film fabricated on a $Si/SiO_2$ substrate by a sputtering device (SRN-100) was analyzed by XRD, TEM, and SIMS. Density and grain size were up to 99% and below $40{\mu}m$, respectively. The specific resistivity of the optimized Ti target was $8.63{\times}10^{-6}{\Omega}{\cdot}cm$.

• 한국분말재료학회지
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• 제26권5호
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• pp.389-394
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• 2019

In the present study, we have investigated the effect of sintering process conditions on the stability of the austenite phase in the nanocrystalline Fe-5wt.%Mn-0.2wt.%C alloy. The stability and volume fraction of the austenite phase are the key factors that determine the mechanical properties of FeMnC alloys, because strain-induced austenite-martensite transformation occurs under the application of an external stress at room temperature. Nanocrystalline Fe-5wt.%Mn-0.2wt.%C samples are fabricated using the spark plasma sintering method. The stability of the austenite phase in the sintered samples is evaluated by X-ray diffraction analysis and hardness test. The volume fraction of austenite at room temperature increases as the sample is held for 10 min at the sintering temperature, because of carbon diffusion in austenite. Moreover, water quenching effectively prevents the formation of cementite during cooling, resulting in a higher volume fraction of austenite. Furthermore, it is found that the hardness is influenced by both the austenite carbon content and volume fraction.

• 한국산학기술학회논문지
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• 제20권10호
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• pp.203-208
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• 2019

디지털 워터마킹은 디지털 컨텐츠에 대한 불법적인 복제를 방지하기 위한 저작권 보호 용도로 개발 되었으나, 최근에는 의료 영상과 같은 디지털 컨텐츠에 대하여 무결성을 검증하고 불법적인 조작이나 변형 위치를 감지하기 위한 기술로도 활용하고 있다. 디지털 컨텐츠에 대한 불법적인 복제를 방지하기 위한 저작권 보호 기술에서는 디지털 컨텐츠에 삽입된 워터마크가 왜곡이나 필터링과 같은 다양한 공격에 대하여 강인해야 하는 특성이 있어야 한다. 그러나 디지털 컨텐츠에 대한 조작이나 변형을 감지하기 위한 기술에서는 컨텐츠에 대한 사소한 변형에 대해서도 삽입된 워터마크가 쉽게 제거되어야 하는 특성이 있어야 컨텐츠에 대한 변형 여부를 확인할 수 있다. 따라서 본 논문에서는 디지털 영상에 대한 변형이나 조작 여부를 쉽게 확인하기 위한 워터마킹 기술을 제안한다. 제안 방법에서는 영상에 대한 변형 유, 무를 확인하기 위해 전체 영상을 $16{\times}16$ 블록 단위로 변형 여부를 검사하고 변형이 발생 된 블록에 대해서는 $4{\times}4$ 블록 단위로 검사를 수행하여 변형이 발생 된 위치를 확인한다.

• Mycobiology
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• 제47권3호
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• pp.301-307
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• 2019

The $11{\alpha}$-hydroxylation of $16{\alpha}$, 17-epoxyprogesterone (EP) catalyzed by Rhizopus nigricans is crucial for the steroid industry. However, lower conversion rate of the biohydroxylation restricts its potential industrial application. The $11{\alpha}$-steroid hydroxylase CYP509C12 from R. oryzae were reported to play a crucial role in the $11{\alpha}$-hydroxylation in recombinant fission yeast. In the present study, the CYP509C12 of R. oryzae (RoCYP) was introduced into R. nigricans using the liposome-mediated mycelial transformation. Heterologous expression of RoCYP resulted in increased fungal growth and improved intracellular reactive oxygen species content in R. nigricans. The $H_2O_2$ levels in RoCYP transformants were approximately 2-folder that of the R. nigricans wild type (RnWT) strain, with the superoxide dismutase activities increased approximately 45% and catalase activities decreased approximately 68%. Furthermore, the $11{\alpha}$-hydroxylation rates of EP in RoCYP transformants (C4, C6 and C9) were 39.7%, 38.3% and 38.7%, which were 12.1%, 8.2% and 9.4% higher than the rate of the RnWT strain, respectively. This paper investigated the effect of heterologous expression of RoCYP in R. nigricans, providing an effective genetic method to construct the engineered strains for steroid industry.

• 사상체질의학회지
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• 제14권2호
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• pp.90-97
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• 2002

Sasang Constitutional Medicine is based on the diversity of human being and medically developed the variation of response to diseases and medicines. The diversity is categorized as four groups Taeyangin, Taeumin, Soyangin, Soeumin according to morphology, physiology, pathology, and pharmacology. The phenotypes of Sasang constitutions represent that constitutions may be possessed of the different genetic backgrounds. To clarify the genetic difference among the Sasang constitutions, we performed a genetic analysis with the 3'-UTR polymorphism of ADPRT (rs=8679) as a pooled DNA sequencing method. ADPRT modulates various nuclear proteins by poly(ADP-ribosy)lation and is involved in the regulation of various cellular processes such as differentiation, proliferation, and tumor transformation. This gene is also involved in the recovery of cell from DNA damage and the brain infarction. The allele frequencies of [T/C] polymorphism of ADPRT of Soeumin and Soyangin groups were (T: 0.94/C: 0.06) and that of Taeumin and Taeyangin groups were (T: l.00/C: 0.00). The allele frequency was not showed the difference between constitution groups. This result represented that the [T/C] polymorphism of ADPRT 3' UTR region was not suitable to classify the constitutions. However, this study is the first trial of Sasang classification according to genetic polymorphism and further analysis will be necessarily to classify the genetic difference of Sasang constitution.

• 대한기관식도과학회:학술대회논문집
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• 대한기관식도과학회 1976년도 제10차 학술대회연제 순서 및 초록
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• pp.87.1-87
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• 1976

Bekesy measured the sound transformation system of the middle ear 49 years ago. According to his reports, a ratio between the size of ear drum and the size of oval window is 17 : 1, and the lever function of the ossicles is physiologically 1.3 : 1. Therefore, the hearing might be aggravated to 27.5㏈ in the case of the vanishment of 3 ossicles. In 1952, Wullstein reported 5 types of tympanop-lasty and the fourth type among them was especially named for the sound-protection. The oval window is only exposed by the sound pressure and the round window is not exposed. According to the application by this idea, the post-operative hearing might be improved until 27.5㏈. Mean while, in 1942, Onchi verified through his experiment that the results of Bekesy's measurement was not completely conformed to Onchi result. Bekesy measured the sound pressure on the stapes plate of the oval window, on the other hand, Onchi measured the sound pressure on the surface of the perilymph of the oval window after removing the stapes plate(Fig. 1).(Figure omitted) The difference of their experiment is recognized that the impedance of the stapes plate exists or not (Fig. 1). Both Audiogrums are compared as Fig. 2. The result of IV type of tympanoplasty is success ful in 54% as the Table 1. (Table Omitted) The reason of unsatisfactory is caused by the thick and unmovable window-membrane and by the closing of air passage to the round window. The closing of the air passage to the round window is occurred by the adhesion between the grafting membrane and the surface of promontorium. In order to preserve this adhesion, I produce to transplantate the mucous membrane of the lip to the bone surface of tympanic cavity after removing the granulation tissue of the tympanic cavity and to form a membranous canal for the sake of air passage (Fig. 3). (Figure Omitted) The post-operative hearing by this method is shown as Fig. 4, 5. In other words, the post-operative sound pressure entered into the cochlea directly, by way of the oval window only, not by way of the round window, as a theorie of the sound protection. (Figure omitted)

• Nuclear Engineering and Technology
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• 제52권5호
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• pp.1013-1021
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• 2020

A combination of simultaneous thermal analysis, evolved gas analysis and non-ambient XRD techniques was used to characterise and investigate the conversion reactions of ammonium uranates into uranium oxides. Two solid phases of the ternary system NH₃ - UO₃ - H₂O were synthesised under specified conditions. Microspheres prepared by the sol-gel method via internal gelation were identified as 3UO₃·2NH₃·4H₂O, whereas the product of a typical ammonium diuranate precipitation reaction was associated to the composition 3UO₃·NH₃·5H₂O. The thermal decomposition profile of both compounds in air feature distinct reaction steps towards the conversion to U₃O₈, owing to the successive release of water and ammonia molecules. Both compounds are converted into α-U₃O₈ above 550 ℃, but the crystallographic transition occurs differently. In compound 3UO₃·NH₃·5H₂O (ADU) the transformation occurs via the crystalline β-UO₃ phase, whereas in compound 3UO₃·2NH₃·4H₂O (microspheres) an amorphous UO₃ intermediate was observed. The new insights obtained on these uranate systems improve the information base for designing and synthesising minor actinide-containing target materials in future applications.

• 한국컴퓨터정보학회논문지
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• 제26권11호
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• pp.85-92
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• 2021

이 논문에서는 회전각도에 무관하게 회전 얼굴과 회전각도를 효과적으로 검출하는 방법이 제안되었다. 회전된 얼굴 검출은 회전에 따른 얼굴 외형의 큰 변화로 인해 어려운 분야이다. 제안한 극좌표계 변환 방법은 회전 각도와 무관하게 얼굴 구성요소들의 위치 정보가 유지되기 때문에 회전으로 인한 얼굴의 외형 변화가 없게 된다. 이에 따라 회전이 없는 정면 얼굴 검출에 사용되지만 회전에 민감한 특성을 갖는 HOG와 같은 특징들이 회전얼굴을 검출하는 과정에서 효과적으로 사용될 수 있다. 극좌표계 변환된 영상에서 얻은 HOG 특징을 SVM을 이용하여 학습하고 회전 얼굴을 검출하였다. 학습 데이터는 회전이 없는 정면 얼굴 영상만을 사용하였다. 3600개 회전 얼굴 영상에 대한 실험 결과 97.94 %의 회전각도 검출률을 얻었다. 또한, 다수의 회전 얼굴이 포함된 배경이 있는 영상들에서 회전 얼굴들의 위치와 회전 각도를 정확하게 검출하였다.

• International Journal of Advanced Culture Technology
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• 제9권3호
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• pp.253-258
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• 2021

This study aims to expose the potential dangers of K-pop through the past and present of K-pop choreography copyrights and to suggest the need to secure digital choreography copyrights for the sustainability of K-pop considering national responsibility. As the content industry quickly sought countermeasures to digital transformation, such as the launch of K-pop platforms and the evolution of OMO (Online Merges with Offline) media commerce in response to changes in the industrial environment due to COVID-19, the annual export of the domestic content industry increased by 6.3% compared to the previous year. Accordingly, our copyright does not require that works be fixed in tangibles, as in Japan and Germany, on the basis of entrusting each country's legislation to determine whether to require fixation on choreographed works. On the other hand, the United States, France and the United Kingdom are demanding that it be fixed. Although choreography is at the center of K-pop and the value and influence of K-pop videos including cover dance through new media are discussed from various perspectives, copyright on choreography that needs to be resolved in business platforms for K-pop scalability The fact that there is such a big difference in problem perception is an area where we must not lose our vigilance. As the development of today's technology, the method of fixing a choreography looks very easy as an image, but at the same time can be stolen very quickly. Therefore, compared to overseas cases, it is urgent to improve the difference in perception of copyright registration for K-pop choreography and to supplement the system include the NFT.