고조선과 주변지역 옛 사람 및 동물뼈 연구를 위한 고고과학적 연구방법론 검토

고아라(Go Ara),홍종하(Hong Jongha) 백산학회 2021 白山學報 Vol.- No.120

고조선은 우리 역사에 나타난 최초의 국가로 한국사에서 중요한 의미를 가지지만 고조선의 정확한 강역, 문화 등에 대한 자료가 많지 않아 지금까지 해당 시기 우리 옛 조상의 삶을 완전하게 이해하는 것은 힘들었다. 다행히도 최근 고고학 발굴현장에서 발견된 사람 뼈, 동물 뼈 및 식물자료와 같은 다양한 유기물 시료에 고고과학적(생물고고학적) 연구 기법을 적용하여 보다 새로운 연구를 시도한 사례들이 세계 각지에서 속속 보고됨에 따라, 본 고에서는 고조선의 실체를 밝히는 데 이러한 연구를 어떻게 적용할 수 있을지 검토해 보고자 하였다. 고조선 시기 고고학 유적에 대해 간략하게 검토해 본 결과, 유적과 지역에 따라 차이가 있으나 일부 사람 및 동물 뼈와 같은 유기물 시료가 발견되었음이 확인되었다. 비록 대부분의 현재 고조선 시료에 현재 우리나라 학자들이 접근하기 쉽지 않다는 어려움이 있으나, 최근 중국에서 다양한 고고과학적 검토가 수행되고 있는 바, 향후 이러한 분석 결과들이 더 많이 보고된다면 고조선의 실체를 명확히밝힐 수 있는 날이 올 것으로 기대한다. 다만 고조선을 한국사의 영역에 좀 더 명확히 위치시키기 위해서는 한반도 내 신석기/청동기 유적 등에서 출토된 사람 및 동물 유체 등 유기물 시료에대한 과학적 분석을 더욱 면밀히 수행하여 고조선 자료와 비교/검토할 수 있는 기초자료를 획득하는 것이 앞으로 필요할 것이다. Gojoseon is the oldest country in Korean history with according enormous significance. However, it has been difficult to fully understand the lives of our ancestors at that time, primarily due to little acquaintance on the exact territorial border and culture of the country. Fortunately, many researches have been reported around the world by performing various scientific researches on archaeological specimens such as human bones, animal bones and plants with advanced techniques. Therefore, in this study, we have examined how such studies could be applied for the purpose of revealing the ancient territory and the culture of Gojoseon. A brief review of archaeological remains dated to the Gojoseon period confirmed the excavations of organic specimens such as human and animal bones with varying aspects depending on the site and region. Despite of a limited accessibility on the Gojoseon samples currently confronted with, various archaeological reviews have been conducted in China recently. It is expected that the existence of Gojoseon could be clarified if similar findings are reported more in the future. Nevertheless, in order to represent the definite presence of Gojoseon in the Korean history, it will be necessary to attain fundamental data from scientific analysis on organic materials obtained from Neolithic and Bronze Age sites in the Korean Peninsula for further comparison and reviews with the equivalent data from proven Gojoseon samples.

Machine Learning Approach for Identifying Magnetic Order

Ara Go 한국자기학회 2023 한국자기학회 학술연구발표회 논문개요집 Vol.33 No.2

Estimation Radioactivity of Reference Spent Fuel With Time and Total Radioactivity of All Spent Fuel at 2035

Ara Go,Daesik Yook,Kyuhwan Jeong 한국방사성폐기물학회 2017 한국방사성폐기물학회 학술논문요약집 Vol.2017 No.05

Vestiges of Topological Phase Transitions in Kitaev Quantum Spin Liquids

Go, Ara,Jung, Jun,Moon, Eun-Gook American Physical Society 2019 Physical review letters Vol.122 No.14

Adaptively truncated Hilbert space based impurity solver for dynamical mean-field theory

Go, Ara,Millis, Andrew J. American Physical Society 2017 Physical Review B Vol.96 No.8

<P>We present an impurity solver based on adaptively truncated Hilbert spaces. The solver is particularly suitable for dynamical mean-field theory in circumstances where quantum Monte Carlo approaches are ineffective. It exploits the sparsity structure of quantum impurity models, in which the interactions couple only a small subset of the degrees of freedom. We further introduce an adaptive truncation of the particle or hole excited spaces, which enables computations of Green functions with an accuracy needed to avoid unphysical (sign change of imaginary part) self-energies. The method is benchmarked on the one-dimensional Hubbard model.</P>

Properties of the one-dimensional Hubbard model: cellular dynamical mean-field description

Go, Ara,Jeon, Gun Sang IOP Pub 2009 Journal of Physics, Condensed Matter Vol.21 No.48

<P>The one-dimensional half-filled Hubbard model is considered at zero temperature within the cellular dynamical mean-field theory (CDMFT). By the computation of the spectral gap and the energy density with various cluster and bath sizes we examine the accuracy of the CDMFT in a systematic way, which proves the accurate description of the one-dimensional systems by the CDMFT with small clusters. We also calculate the spectral weights in a full range of the momentum for various interaction strengths. The results do not only account for the spin–charge separation, but they also reproduce all the features of the Bethe ansatz dispersions, implying that the CDMFT provides an excellent description of the spectral properties of low-dimensional interacting systems. </P>

Single-site and Cellular Dynamical Mean-field Theory of the Anderson-Hubbard Model

Ara Go,전건상 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.5

We study the Anderson-Hubbard model to examine the interplay between the disordered potential and the Hubbard interactions. We use the dynamical mean-field theory (DMFT) with an exact diagonalization as an impurity solver to effectively deal with the quantum fluctuations due to the local interactions. In order to characterize the paramagnetic metal-insulator transition in disordered systems, we compute the typical local density of states, as well as the arithmetically-averaged local density of states. Our approach is found to reproduce the characteristic features of the metalinsulator transition in infinite dimensions, such as the existence of the disorder-driven metallic phase for moderate values of disorder strength and interactions, as observed in earlier studies. In two dimensions, the system turns out to exhibit more insulating behavior when we increase the cluster size in the cellular DMFT. The metallic phase, which is induced from weak Mott insulators by the introduction of a disordered potential, is not observed in two dimensions.

성인애착과 소셜미디어 중독경향성 관계에서 경험회피의 매개효과

고아라 ( Go Ara ),이경순 ( Kyungsoon Lee ) 한국교육정보미디어학회(구 한국교육정보방송학회) 2018 교육정보미디어연구 Vol.24 No.3

이 연구의 목적은 성인애착과 소셜미디어 중독경향성 관계에서 경험회피의 매개효과를 확인하는 것이었다. 이를 위하여 221명 대학생에게 성인애착, 경험회피, 소셜미디어 중독경향성에 대한 설문조사를 하였다. 분석 결과는 다음과 같았다. 첫째, 성인애착(애착불안, 애착회피), 경험회피, 소셜미디어 중독 경향성 사이에 유의한 정적 상관이 있었다. 둘째, 애착불안이 경험회피와 소셜미디어 중독경향성에 영향을 미치고 경험회피는 애착불안과 소셜미디어 중독경향성 관계를 부분 매개하는 것으로 나타났다. 즉, 애착불안은 소셜미디어 중독경향성에 직접적인 영향을 미치는 동시에 경험회피를 통해서 간접적인 영향도 미치는 것으로 나타났다. 셋째, 여자 대학생의 경우 성인애착과 소셜미디어 중독경향성 관계를 경험회피가 매개하는 것으로 나타났다. 구체적으로, 여자대학생의 애착불안과 소셜미디어 중독경 향성 관계를 경험회피가 부분 매개하였고, 애착회피와 소셜미디어 중독경향성 관계를 경험회피가 완전 매개하였다. 즉, 여자대학생의 소셜미디어 중독경향성은 애착불안과 애착회피의 영향을 받으며, 특히 애착회피 경향이 있을수록 경험회피에 주목해야 함을 알 수 있었다. 반면, 남자 대학생의 경우는 성인애착과 소셜미디어 중독경향성에 대한 경험회피의 매개 효과가 검증되지 않았다. 따라서 대학생의 소셜미디어 중독경향성을 완화하기 위해서는 애착 유형과 성차에 따라 차별적인 처치가 필요함을 알 수 있었다. 이러한 결과를 바탕으로 실천적 시사점과 함께 후속 연구 방향을 제시하였다. The use of social media among college students is prevalent, and its relationship to attachment and experiential avoidance is unknown. A growing body of research examines the addiction of social media where users can have close relationship with meaningful others. The purpose of this study is to examine the mediating effects of undergraduate students’ experiential avoidance in the relationship between the adult attachment and social media addiction. For the study, 221 college students have completed a paper survey assessing the perception of adult attachment, experiential avoidance, and social media addiction. Data were analyzed to determine what, if any, relationship exists between the three mentioned above. Results are as follows: First, social media addiction had a positive correlation with attachment style(attachment anxiety, attachment avoidance) and experiential avoidance. Second, hierarchical regression analysis showed that the attachment anxiety, the subset of insecure adult attachment, was mediated by the experiential avoidance in the relationship with the social media addiction. It means attachment anxiety had a direct influence on social media addiction and simultaneously had an indirect influence on experiential avoidance. Third, in the case of female college students, the relationship between the adult attachment and social media addiction was mediated by the experiential avoidance. Specifically, the attachment anxiety was partially mediated and the attachment avoidance was totally mediated by the experiential avoidance in the relationship with the social media addiction. It means that the social media addiction of female students are influenced by both insecure attachment style and the experiential avoidance may be need to be emphasized to a greater extent than male students. On the contrary, in the case of male students, the mediation effects was not verified. Therefore, in order to reduce the social media addiction, the differential intervention is needed according to the attachment style and gender. Based on these results, possible directions for future research were also suggested.

Effects of dietary supplementation with probiotic CS-A on performance in broiler chickens

Seong Soo Kang1*, Se Eun Kim, Ara Go, Kyung Mi Shim, Chun Sik Bae, Chang Jong Moon, Sung-Ho Kim, Jong-Choon Kim, Jin-Cheol Yoo, Seung Sik Cho 충북대학교 동물의학연구소 2012 Journal of Biomedical and Translational Research Vol.13 No.3

Probiotics, enzymes, organic acids, oligosaccharides, antioxidants, and other functional materials are actively being explored as alternatives to antibiotics. Probiotics include live beneficial microorganisms that colonize the intestinal tract and competitively inhibit attachment and growth of harmful microbes. Probiotics also increase feed efficiency by assisting in nutrient absorption and digestion. The current study was conducted in order to evaluate the effect of a new probiotic, CS-A, as a dietary supplement of a fermented product on growth performance, feed intake, and feed conversion efficiency in broiler chickens, and to evaluate its value as an alternative for antibiotics used as a feed additive. Antibacterial and anti-inflammatory effects of CS-A were investigated in vitro and the in vivo effects of a constant concentration of supplemented CS-A on growth rate and feed efficiency were evaluated. In addition, the safety of CS-A was assessed by examination of common symptoms and mortality. Determination of minimal inhibitory concentration revealed an excellent antibacterial effect of CS-A. Cytotoxicity was low and anti-inflammatory effects were achieved at the effective concentration of CS-A. Supplementation with 0.1% CS-A resulted in a feed efficiency score of 1.84 in broilers, compared to 2.00 in the control group. There were no adverse clinical findings, necropsy findings, hematology, and altered serum biochemistry parameters, and no mortality. Thus, it is concluded that CS-A is safe and effective as a feed additive.

Microbial synthesis of C9 to C13 ω-hydroxycarboxylic, ω-aminocarboxylic, and α,ω-dicarboxylic acids from renewable fatty acids

Go-eun CHOI,Ara CHO,Ji-Won SONG,Ji-Min WOO,Jin-Byung PARK 한국생물공학회 2018 한국생물공학회 학술대회 Vol.2018 No.10