• 자원환경지질
• /
• 제30권5호
• /
• pp.395-406
• /
• 1997

Some RE (Zr, Nb, REE) ore deposits are located in the middle part of the Korean peninsula. Geotectonically, the RE ore deposits situated on the Kyemyeongsan Formation of northern margin of the Okcheon geosynclinal belt and in the transitional zone between Kyeonggi massif and Okcheon belt. The rare metal deposits distributed in Kyemyeongsan Formation which consists of schist and alkaline granite. The alkali granite has suffered extensive post-magmatic metasomatism and hydrothermal processes. The ore contains mainly Ce-La, Ta-Nb, Y, Y-Nb, Ti-Nb-(U), Nd-Th group minerals. Fergusonite, one of Nb-Y rich REE minerals belonging to the A-B oxides, is most common mineral in the rare metal deposits. The fergusonite bearing rocks may be devided into four types by occurrence features and mineral association, that is, zircon type, allanite vein, feldspar type, and fluorite type. Fergusonites show wide variations in optical properties, due to part of differences in their chemical composition (depending on the types), but also the degree of crystalinity of the individual specimens. Fergusonite metamicts enclosed in biotite are generally surrounded by well developed pleochroic haloes. Usually, fergusonite is accompanied with zircon and other REE-bearing minerals. Petrographical and chemical data are presented for fergusonites which collected different types. $Nb_2O_3$ and $Y_2O_3$ contents range from 48.51 to 53.01 wt.% and 29.18 to 42.02 wt.% respectively. Also, $ThO_2$, (1.83~6.93), $UO_2$, (0.17~2.84), ${\sum}RE_2O_3$ (except to Y) (1.11~8.73), and $TiO_2$, (0.19~1.19 wt.%) contents show variational compositions according to fergusonite types. The ${\sum}RE_2O_3$ of fergusonites are positive relation with $Y_2O_3$ and negative relaton with $ThO_2$ and $({\sum}{RE_2O_3}-{Y_2O_3})$. The $Nb_2O_3$ is sightly negative relation with $Ta_2O_3$. Back-scattered electron microscope images (BEI) of fergusonite show the mineral composition and textural feature is very complicated. The variation of Nb, Th and REE content of fergusonite and the modes of occurrence of mineral, suggests that REE may have been mobilized during the circulation of hydrothermal fluids related to contact metamorphism (metasomatism). The chemical variation of the fergusonites with occurrences and mineral association can be related to metasomatism of alkaline fluid was probably the dominant ore-forming process in Chungju district.

• 한국산학기술학회논문지
• /
• 제18권8호
• /
• pp.285-293
• /
• 2017

본 연구의 목적은 다면적 인성검사(MMPI-2)의 임상척도와 뇌기능지수 중 자기조절지수와의 관련성을 알아보고자 하는데 있다. 연구는 상담센터에 내원한 20세 이상의 성인 남녀 중 자원한 41명을 대상으로 진행하였다. 자기보고식 검사지인 다면적 인성검사(MMPI-2)를 이용해 검사를 진행했으며, 2채널 뇌파측정기를 이용해 Fp1,과 Fp2에서 뇌파를 측정하였다. 연구결과는 다면적 인성검사(MMPI-2)의 임상척도인 척도2(D)와 자기조절지수 중 휴식 즉, 알파파와 음의 상관을 보였으며, 다면적 인성검사(MMPI-2) 척도3(Hy)은 집중력 즉, 저베타파와 양의 상관성을 보였고, 척도 7(Pt)은 휴식과 음의 상관성을 보였다. 상담현장에서 다면적 인성검사(MMPI-2)와 SQR을 상호 보완하여 사용할 수 있다는데 본 연구의 의의가 있다. 이러한 결과는 세 가지 시사점을 갖는 것으로 해석 가능하다. 첫째, 우울한 정서를 가진 사람들은 타인의 시선과 평가에 민감하여 대인관계를 맺을 시 많은 에너지를 사용하게 되어 휴식이 유지되지 못하기 때문에 피로도가 상승할 수 있다. 둘째, 지나치게 타인의 관심을 얻으려고 하고 쾌활한 모습을 지닌 사람들은 활동력이 높을 것으로 여겨진다. 셋째, 불안과 긴장 상태로 스트레스가 높아진 사람들은 쉽게 지치고 짜증과 불쾌감이 상승할 수 있다는 것을 시사한다.

• 한국콘텐츠학회논문지
• /
• 제20권11호
• /
• pp.131-144
• /
• 2020

많은 나라에 정치적 연결이 널리 퍼져 있으며 현재 경제연구에서 화두가 되고 있다. 중국에서는 기업들이 여러 가지 방법으로 정치적 연결을 활발히 형성하고 있다. 본 논문은 연구모델과 이론분석을 바탕으로 2010~2014년 중국 A주 상장부동산의 재무자료와 기업지배구조 자료를 활용해 정치연계 및 기업성과의 연구 모델을 제시하고 구성한다. 논문은 주로 CEO의 정치 연관성을 분석한다. 이 연구는 분석 결과에 대해 일변량 회귀 분석과 다변량 분석을 사용하여 강건성 테스트를 수행한다. 실증적 연구 분석은 세 부분으로 구성되어 있다. 첫째, 중국 상장 부동산 기업의 경우 CEO 정치 연계는 기업 실적과 상당히 부정적인 상관관계를 가지고 있다. 이는 CEO가 정치적 연줄이 있는 부동산 기업이 다른 기업보다 낮은 성과를 얻는다는 것을 의미한다. 둘째, CEO의 개인적 특성에서 연령, 성별, 교육수준은 기업의 성과와 긍정적인 관계를 가지며, 추가적인 이후 상황은 기업의 성과와 부정적으로 관련되어 있다는 것을 의미한다. 마지막으로 기업 특성은 기업의 성과와 부정적인 관계를 가지며, 최고 관리자 수는 기업의 성과와 긍정적으로 관련되어 있다. 이 연구는 중국 부동산 산업의 정치적 연관성에 대한 연구를 수행했으며, 기업의 발전에 유익한 참고 자료를 제공할 수 있다.

• 한국수산과학회지
• /
• 제55권5호
• /
• pp.612-624
• /
• 2022

A novel Gram-positive, motile, non-spore forming aerobic marine bacterium, designated 107-1^T was isolated from tidal mud collected in Gyehwa-do, South Korea. Cells of strain 107-1^T were short rod or coccoid, oxidase negative, catalase positive and grew at 10-40℃ (with optimum growth at 25-30℃). It utilized menaquinones MK-7 and 8 as its respiratory quinones and its major fatty acids were anteiso-C_15:0 (37.9%), iso-C_16:0 (14.9%), and iso-C_14:0 (10.8%). Phylogenetic analysis based on 16S rRNA gene sequences revealed a distinct clade containing strain 107-1^T and close species Planococcus ruber CW1^T(98.52% sequence similarity), P. faecalis KCTC 33580^T(97.67%), P. kocurii ATCC 43650T(97.48%), P. donghaensis DSM 22276T(97.47%), and P. halocryophilus DSM 24743T(97.37%). Strain 107-1^T contains one circular chromosome (3,513,248bp in length) with G+C content of 44.6 mol%. Estimated ranges for genome to genome distance, average nucleotide identity, and average amino acid identity comparing strain 107-1^T with close taxa were 20.3-34.8%, 77.9-86.9%, and 73.6-92.8%, respectively. Based on polyphasic analysis, strain 107-1^T represents a novel species belonging to the genus Planococcus.

• Asian Journal for Public Opinion Research
• /
• 제8권3호
• /
• pp.393-406
• /
• 2020

The discourse on the lockdown in Indonesia is getting stronger due to the increasing number of positive cases of the coronavirus and the death rate. As of August 12, 2020, the confirmed number of COVID-19 cases in Indonesia reached 130,718. There were 85,798 victims who have recovered and 5,903 who have died. Data show a significant increase in cases of COVID-19 every day. For this reason, there needs to be an evaluation of the government policy of the Republic of Indonesia in dealing with the COVID-19 pandemic in Indonesia. An evaluation of policies for handling the pandemic must include public opinion to determine any weaknesses of this policy. The development of public opinion about the lockdown policy can be understood through social media. During the COVID-19 pandemic, measuring public opinion through traditional methods (surveys) was difficult. For this reason, we utilized big data on social media as research data. The main purpose of this study is to understand public opinion on the lockdown policy in overcoming the COVID-19 pandemic in Indonesia. The things observed included: volume of Twitter users, top influencers, top tweets, and communication networks between Twitter users. For the methodological development of future public opinion research, the researchers outline the obstacles faced in researching public opinion based on big data from Twitter. The research results show that the lockdown policy is an interesting issue, as evidenced by the number of active users (79,502) forming 133,209 networks. Posts about the lockdown on Twitter continued to increase after the implementation of the lockdown policy on April 10, 2020. The lockdown policy has caused various reactions, seen from the word analysis showing 14.8% positive sentiment, 17.5% negative, and 67.67% non-categorized words. Sources of information who have played the roles of top influencers regarding the lockdown policy include: Jokowi (the president of the Republic of Indonesia), online media, television media, government departments, and governors. Based on the analysis of the network structure, it shows that Jokowi has a central role in controlling the lockdown policy. Several challenges were found in this study: 1) choosing keywords for downloading data, 2) categorizing words containing public opinion sentiment, and 3) determining the sample size.

• 한국산림과학회지
• /
• 제100권2호
• /
• pp.202-211
• /
• 2011

강원도 춘천시 근교의 강원대학교 산림환경과학대학 학술림 내의 산지계류를 대상으로 계단상 하상구조의 기하학적 특성과 이에 대한 계류 지형인자들과의 관계를 분석하였다. 조사구간에 형성된 스텝의 간격, 높이 및 낙차의 평균값은 각각 4.69 m, 0.47 m 및 0.71 m, 스텝의 구성입경은 평균 0.68 m, 스텝의 형성개수는 100 m당 평균 21 개인 것으로 나타났다. 스텝의 간격은 하폭대비 약 0.5로 선행연구들에 비해 작은 것으로 나타났으며, 스텝의 기울기는 평균 0.13이었다. 스텝의 각 기하학적 특성과 하폭과의 사이에는 모두 상관관계가 존재하지 않았으나, 스텝의 간격과 높이는 하상경사와 각각 부 정의 상관관계를 나타내었다. 또한 스텝의 기울기는 하상경사와 정의 상관을 보였고, 하상경사와의 비가 1.2로 나타나 유수에 대한 최대저항조건을 만족하며 비교적 안정상태를 유지하고 있는 것으로 나타났다. 특히 하상경사는 계단상 하상구조의 기하학적 형상(스텝의 낙차와 높이의 비)에 영향을 미치는 것으로 나타났다. 한편 스텝의 간격과 낙차는 거석의 입경과 모두 정의 상관관계를 보였다. 이러한 결과들로부터 계단상 하상구조의 동태는 산지계류의 물리 생태적 환경에 큰 영향을 미칠 것으로 판단되며, 산지가 대부분인 우리나라의 계류관리에 있어서 특히 중요하게 인식되어야 할 것이다.

• 한국치위생학회지
• /
• 제8권4호
• /
• pp.165-180
• /
• 2008

The present study is a descriptive survey on factors affecting middle school students' oral health belief and oral health practice. In order to find methods for forming right beliefs and inducing desirable behavioral patterns, we conducted a questionnaire survey with 470 students at two middle schools in Cheongju and drew conclusions as follows. Of the 470 questionnaires, 457 were recovered. With 10 inappropriately answered ones excluded, 446 questionnaires were analyzed. 1. As to oral health belief according to general characteristics, susceptibility was 2.63 points (p=0.035) in male students, 2.68 (p=0.016) in 3rd year students, and 2.92 (p=0.002) in only child students. Seriousness was 2.57 (p=0.017) in male students, 2.67 (p=0.001) in 3rd?year students, and 2.92 (p=0.001) in only child students. barrier was 2.62 (p=0.009) in 3rd year students, and 2.95 (p=0.002) in only child students. Benefit was 3.40 (p=0.011) in female students, and 3.43 (p=0.003) in 1st year students. salience was 3.21 (p=0.006) in female students, and 3.24 (p=0.009) in 1st year students. 2. As to oral health belief according to oral?health?related factors, susceptibility and seriousness were 2.69 (p=0.003) and 2.72 (p=0.000), respectively, in the lower?middle class group, 2.83 (p=0.001) and 2.80 (p=0.003), respectively, in the drink taking group, and 2.80 (p=0.000) and 2.75 (p=0.000), respectively, in the low conversation group. barrier was 2.63 (p=0.018) in the lower?middle class group, 2.67 (p=0.021) in the low conversation group, and 2.77 (p=0.000) in the group fearing the visit to the dental clinic. Benefit was 3.36 (p=0.000) in the high conversation group, and 3.37 (p=0.0l5) in the group visiting the dental clinic for prevention. salience was 3.26 for beverage and 3.20 (p=0.003) for fruit and vegetable. 3. As to oral health practice according to general characteristics, the score of oral health practice was 3.21 (p=0.000) in female students, 3.30 (p=0.000) in those aged 12 or below, and 3.27 (p=0.000) in 1st?year students. 4. As to oral health practice according to factors related to oral health, the point was 3.17 (p=0.002) in the middle upper class group, 3.24 (p=0.001) in the group eating mainly fruit or vegetable, and 3.18 (p=0.030) in those with experience in education. 5. Oral health practice was in a negative correlation with susceptibility (r=-0.143), and in a positive correlation with benefit (r=0.229) and salience (r=0.286).

• Animal Bioscience
• /
• 제35권1호
• /
• pp.64-74
• /
• 2022

Objective: This study was conducted to investigate the effects of dietary multi-strain probiotic (MSP) (Bacillus coagulans Unique IS2 + Bacillus subtillis UBBS14 + Saccharomyces boulardii Unique 28) on performance, gut morphology and expression of nutrient transporter related genes in broiler chickens. Methods: A total of 256 (4×8×8) day-old CARIBRO Vishal commercial broiler chicks of uniform body weight were randomly distributed into four treatments with 8 replicates each and having eight chicks in each replicate. Four dietary treatments were T₁ (negative control-basal diet), T₂ (positive control-antibiotic bacitracin methylene disalicylate at 20 mg/kg diet), T₃ (MSP at 10⁷ colony-forming unit [CFU]/g feed), and T₄ (MSP at 10⁸ CFU/g feed). Results: During 3 to 6 weeks and 0 to 6 weeks, the body weight gain increased significantly (p<0.05) in T₃ and T₄ groups. The feed intake significantly (p<0.05) reduced from T₁ to T₃ during 0 to 3 weeks and the feed conversion ratio also significantly (p<0.05) improved in T₃ and T₄ during 0 to 6 weeks. The humoral and cell mediated immune response and the weight of immune organs were also significantly (p<0.05) improved in T₃ and T₄. However, significant (p<0.05) dietary effects were observed on intestinal histo-morphometry of ileum in T₃ followed by T₄ and T₂. At 14 d post hatch, the relative gene expression of glucose transporter (GLUT5), sodium-dependent glucose transporter (SGLT₁) and peptide transporter (PepT₁) showed a significant (p<0.05) up-regulating pattern in T₂, T₃, and T₄. Whereas, at 21 d post hatch, the gene expression of SGLT₁ and PepT₁ was significantly (p<0.05) downregulated in MSP supplemented treatments T₃ and T₄. Conclusion: The supplementation of MSP at 10⁷ CFU/g diet showed significant effects with improved performance, immune response, gut morphology and expression of nutrient transporter genes. Thus, the MSP could be a suitable alternative to antibiotic growth promoters in chicken diets.

• 한국어병학회지
• /
• 제36권2호
• /
• pp.277-286
• /
• 2023

Korean rockfish, Sebastes schlegelii, is a representative bony fish that belongs to the family Scorpaenidae and the order Scorpaeniformes. It has high ecological and economic value and is widely cultivated in many East Asian countries, including South Korea, Japan and China. One of streptococci, Streptococcus iniae, is Gram-positive cocci with a negative reaction for catalase and oxidase. The Korean rockfish shows clinical signs when infected with S. iniae, such as body darkening, bleeding, enlarged kidneys, blurred eyes, abdominal distension, etc., ultimately leading to death. The Korean rockfish causes significant economic losses every year in South Korea due to streptococcosis. In this study, we identified bacteria from the fish using polymerase chain reaction and conducted analyses of hemolytic activity and biochemical tests using API 20 STREP and API ZYM systems. Results of confirming the hemolytic activity (n=4) observed in alpha-type hemolysis (25%), beta-type hemol- ysis (50%), and gamma-type hemolysis (25%) of isolates. The biochemical test results exhibited sig- nificant variation among S. iniae. Additionally, we performed intraperitoneal injection with S. iniae in the fish and analyzed the phylogenetic tree using housekeeping genes of S. iniae, including cpsD, arcC, glnA, groEL, gyrB, mutS, pheT, prkC, rpoB, and tkt, via multilocus sequence typing (MLST). The lethal dose (LD₅₀) showed strong pathogenicity, such as 3.34 × 10 colony-forming unit (CFU)/ml for 23FBStr0601 strain and 7.16 × 10 CFU/ml for 23FBStr0602 strain. 23FBStr0603 strain showed relatively low pathogenicity at 1.73 × 10⁵ CFU/ml. The strains 23FBStr0601 and 23FBStr0602, which showed strong pathogenicity, clustered into one monophyletic group. The 23FBStr0603 strain showed weak pathogenicity and formed a monophyletic group with KCTC 3657.

• 디지털융복합연구
• /
• 제18권2호
• /
• pp.277-284
• /
• 2020

텍스트마이닝은 비정형, 대용량의 텍스트 자료로부터 유의미한 정보를 추출하는 빅데이터 분석의 대표적인 방법이다. 트위터와 같은 SNS는 1초에서 수십만건의 데이터를 생성해내며 대중들의 의견이나 생각 등을 즉각적이며 직접적으로 보여주는 1인 미디어로의 역할을 하고 있다. 기성 미디어인 언론은 정보전달, 사회비판, 여론형성의 기능을 수행하고 있다. 본 논문에서는 미디어로의 SNS와 언론을 비교해 보고자 한다. 이를 위해 2019년 하반기 국내의 이슈 중의 하나인 "한일군사정보보호협정(GSOMIA) 종료"에 대한 SNS의 반응과 언론의 반응을 비교 분석한다. 수집된 데이터는 총 201,728개의 트윗과 20,698개의 신문 기사를 대상으로 감성분석, 연관분석, 군집분석을 수행하였다. 그 결과로 SNS의 경우 이슈에 대해 긍정적 반응이 높았고 언론의 경우는 부정적 반응이 높았다. 연관검색의 경우는 SNS의 경우 "파기, 결정, 우리" 등 국내적 이슈에 대한 지지가 높았고 언론의 경우 "실망, 유감, 우려" 등으로 대외적 이슈에 대한 부정적 견해를 보여주는 차이를 보여주었다. SNS는 정보전달의 기능보다는 사회 비판 및 여론의 추이를 살피거나 형성하는데 언론보다 빠르고 강하게 나타내고 있어 언론이 대중의 인식을 반영해주는 역할을 보완할 수 있다.