• 한국산업정보학회논문지
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• 제19권6호
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• pp.7-13
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• 2014

Twitter is a microblogging service that allows users to post short messages on a variety of topics in real-time. In this work, we analyze Twitter messages posted during the 2012 elections and find those implications. This study uses Twitter messages related to the 2012 South Korean presidential campaign. The three main candidates are represented by the abbreviations A, M, and P. According to the statistical analysis, the number of tweets and re-tweets for candidate P was relatively stable over the entire campaign period. Candidate P had the highest percentage of terms related to elections pledges, and candidates A and M were judged to be a little bit poorer with respect to campaign promises. The positive terms ratio for candidate P was higher than those for the other two candidates. The negative terms ratio in the Twitter messages of P was considerably smaller than those of candidates A and M. After considering all these results, it is suggested cautiously that Twitter messages posted during an election campaign could be correlated with the outcome of the election.

• 대한의용생체공학회:의공학회지
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• 제17권2호
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• pp.235-240
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• 1996

The automated ECG diagnostic systems that are odd in hospitals have low performance of P-wave detection when faced with some diseases such as conduction block. So, the purpose of this study was the improvement of detection performance in conduction block which is low in P-wave detection. The first procedure was removal of baseline drift by subtracting the median filtered signal of 0.4 second length from the original signal. Then the algorithm detected R peak and T end point and cancelled the QRS-T complex to get'p prototypes'. Next step was magnification of P prototypes with dispersion and detection of'p candidates'in the magnified signal, and then extraction of contextual information concerned with P-waves. For the last procedure, the CIR was applied to P candidates to confirm P-waves. The rule base consisted of three rules that discriminate and confirm P-waves. This algorithm was evaluated using 500 patient's raw data P-wave detection perFormance was in- creased 6.8% compared with the QRS-T complex cancellation method without application of the rule base.

• 한국항공운항학회지
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• 제31권1호
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• pp.57-67
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• 2023

The purpose of this study was to analyze male pilot candidates' life satisfaction, basic psychological needs and grit by experiencing COVID-19 period for pilot literacy education. Participants were 1,249 male pilot candidates (COVID-19 before 613, during 636) were voluntarily participated. The data were gathered from totally 29 question's questionnaire at April 2018 and 2022. Statistical treatment was processed (by SPSS 21.0 for windows) as descriptive and two-way ANOVA for analyzing variables' interaction and main effects. The correlation analysis was processed for analyzing each variable's relations. And the multiple regression analysis was conducted for basic psychological needs' each variables' effect on life satisfaction. Statistical significancy was set as p<.05. The results were as follows. First, variables showed significances (p<.05~.01) by COVID-19 except life satisfaction and competence. Second, correlations showed higher R² value in 2018 than 2022 and significances (p<.05~.01) among all variables, but, passion of grit need to be inspected in subsequent study. Third, multiple regressions showed significancies (p<.05) in all variables in 2018, but, relatedness was excluded in 2022. In conclusion, experiencing COVID-19 period affected pilot candidates' life and it need to be inspected the degree of effect of variables in subsequent study.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2014년도 제46회 동계 정기학술대회 초록집
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• pp.192.2-192.2
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• 2014

Among various dopant candidates, nitrogen (N) atoms are considered as the most effective dopants to improve the diverse properties of graphene. Unfortunately, recent experimental and theoretical studies have revealed that different N-doped graphene (NGR) conformations can result in both p- and n-type characters depending on the bonding nature of N atoms (substitutional, pyridinic, pyrrolic, and nitrilic). To overcome this obstacle in achieving reliable graphene doping, we have carried out density functional theory calculations and explored the feasibility of converting p-type NGRs into n-type by introducing additional dopant candidates atoms (B, C, O, F, Al, Si, P, S, and Cl). Evaluating the relative formation energies of various binary-doped NGRs and the change in their electronic structure, we conclude that B and P atoms are promising candidates to achieve robust n-type NGRs. The origin of such p- to n-type change is analyzed based on the crystal orbital Hamiltonian population analysis. Implications of our findings in the context of electronic and energy device applications will be also discussed.

• 천문학회보
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• 제37권1호
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• pp.98.2-98.2
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• 2012

It has been speculated that there could be dormant or extinct comets in the list of known asteroids, which appear asteroidal but are icy bodies originating from outer solar system. However, little is known about the existence of such objects not only because of their complicated chaotic orbits but also because of the limited physical and chemical information. AKARI infrared space mission gave us brand-new albedo catalog of Near Earth Objects, which clues in a better understanding of dark asteroids using both albedo data and dynamical models could be possible. Dark Asteroids with low () albedos are thought to be dormant or extinct comet candidates due to its similar albedo values with comet nucleus. In addition to this, dynamical models indicate that candidate cometary objects have Tisserand parameter. Based on both observational and dynamical criteria, we obtained 196 dark asteroids lists. We numerically integrated backward their orbits using the N-body code Mercury6 (Chambers 1999) during 10 million years to track the past orbits of bodies. We picked out 14 comet candidates that show abnormal orbits in the past by analyzing orbital elements among 196 candidates. From the dynamical evolution simulations, we finally obtained 3 most-likely comet candidates; 944Hidalgo,2006QL39,andP/SidingSpring.Twoofthemareconsistent with past research; P/Siding Spring is a known comet and 944 Hidalgo is a most-likely comet candidate in asteroid populations. Since they all have stable orbits in nowadays although they have unstable orbit in the past, we could conclude that they may be not active comets but dormant or extinct comets.

• 임상간호연구
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• 제15권3호
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• pp.95-105
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• 2009

Purpose: This study was conducted to investigate the knowledge and attitude about organ donation and organ transplantation among the organ donation candidates. Methods: The subjects were 91 candidates who are enrolled in organ transplantation center in general hospitals for organ donation or transplantation. The knowledge and attitude instruments about organ donation and transplantation by Matten, et al. (1991) were utilized. The collected data were analyzed by SPSS/WIN 14.0: descriptive statistics, t-test, ANOVA, $Scheff{\acute{e}}$ test and Pearson correlation coefficient. Results: The mean score of knowledge was relatively low ($9.61{\pm}3.47$, out of 21.0). The mean score of attitude was relatively high ($4.24{\pm}0.97$, of max score 5). There was significant difference (p<.05) in knowledge according to academic career, registered period as a candidate, the intention to participate in an organ donation education. There was significant difference (p<.05) in attitude according to occupation, family's consent, and recommendation to family. The relationship between knowledge and attitude was not stylistically significant (r=.043, p=.683). Conclusion: These findings suggest that nurses should develop educational programs to increase knowledge and positive attitude toward the organ donation and transplantation.

• 한국항공운항학회지
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• 제18권1호
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• pp.83-88
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• 2010

The study is intended to help to select the pilot candidates with exceptional flight aptitude ability and to investigate the relationship between the results of the scholastic aptitude test and the flight aptitude. It is intended that the research will help to draw recommendations on the relevant fields of the scholastic aptitude test that is to be used to select the high caliber candidates with exceptional flight aptitude ability, to gauge the resulting effectiveness of its application and helping to revise the university's syllabus accordingly. From the study, korean, mathematics, english grade and the flight aptitude test results have all shown to hold mutual relationship and through simple correlation analysis, it was discovered that mathematics and English are the two factors that affect the results of the flight aptitude test, with the extent of its impact graded in descending order of English, mathematics and Korean. Lastly, the logistic regression analysis have discovered that the mathematics grade has significant effect on the classification of the flight aptitude and non aptitude category groups, and English also has significant influence close to the 0.05 p-values. It is believed that should the findings of this study be considered as part of the selection process of the university applicants of the department of aeronautical science, making discovery of candidates of higher quality is expected.

• 대한수학회지
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• 제48권4호
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• pp.837-847
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• 2011

For an integer $m{\geq}3$, every integer of the form $p_m(x)$ = $\frac{(m-2)x^2(m-4)x}{2}$ with x ${\in}$ $\mathbb{Z}$ is said to be a generalized m-gonal number. Let $a{\leq}b{\leq}c$ and k be positive integers. The quadruple (k, a, b, c) is said to be universal if for every nonnegative integer n there exist integers x, y, z such that n = $ap_k(x)+bp_k(y)+cp_k(z)$. Sun proved in [16] that, when k = 5 or $k{\geq}7$, there are only 20 candidates for universal quadruples, which h listed explicitly and which all involve only the case of pentagonal numbers (k = 5). He veri ed that six of the candidates are in fact universal and conjectured that the remaining ones are as well. In a subsequent paper [3], Ge and Sun established universality for all but seven of the remaining candidates, leaving only (5, 1, 1, t) for t = 6, 8, 9, 10, (5, 1, 2, 8) and (5, 1, 3, s) for s = 7, 8 as candidates. In this article, we prove that the remaining seven quadruples given above are, in fact, universal.

• Korean Journal of Radiology
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• 제24권6호
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• pp.564-573
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• 2023

Objective: To investigate the feasibility of assessing the viscoelastic properties of the brain using magnetic resonance elastography (MRE) and a novel MRE transducer to determine the relationship between the viscoelastic properties and glymphatic function in neurologically normal individuals. Materials and Methods: This prospective study included 47 neurologically normal individuals aged 23-74 years (male-to-female ratio, 21:26). The MRE was acquired using a gravitational transducer based on a rotational eccentric mass as the driving system. The magnitude of the complex shear modulus |G^*| and the phase angle 𝛗 were measured in the centrum semiovale area. To evaluate glymphatic function, the Diffusion Tensor Image Analysis Along the Perivascular Space (DTI-ALPS) method was utilized and the ALPS index was calculated. Univariable and multivariable (variables with P < 0.2 from the univariable analysis) linear regression analyses were performed for |G^*| and 𝛗 and included sex, age, normalized white matter hyperintensity (WMH) volume, brain parenchymal volume, and ALPS index as covariates. Results: In the univariable analysis for |G^*|, age (P = 0.005), brain parenchymal volume (P = 0.152), normalized WMH volume (P = 0.011), and ALPS index (P = 0.005) were identified as candidates with P < 0.2. In the multivariable analysis, only the ALPS index was independently associated with |G^*|, showing a positive relationship (β = 0.300, P = 0.029). For 𝛗, normalized WMH volume (P = 0.128) and ALPS index (P = 0.015) were identified as candidates for multivariable analysis, and only the ALPS index was independently associated with 𝛗 (β = 0.057, P = 0.039). Conclusion: Brain MRE using a gravitational transducer is feasible in neurologically normal individuals over a wide age range. The significant correlation between the viscoelastic properties of the brain and glymphatic function suggests that a more organized or preserved microenvironment of the brain parenchyma is associated with a more unimpeded glymphatic fluid flow.

• 한국언론정보학보
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• 제32권
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• pp.113-146
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• 2006

본 연구에서는 미디어 이용과 선거캠페인의 이용이 투표참여에 어떤 영향을 미치는지를 분석하기 위해 1) 지역미디어이용과 주의 깊은 선거캠페인 이용이 대인커뮤니케이션과 투표참여에 영향을 끼쳤는가 2) 주의 깊은 선거캠페인에서 형성된 후보자 이미지가 투표에 영향을 미쳤는가, 또, 정당요인이 크게 작용하는 지방선거에서 정당요인과 이미지요인이 투표에 어떤 영향을 가지는가 그리고 3) 각기 다른 매체들은 후보자 이미지가 형성되는 과정에서 어떤 차별적 역할을 하는가를 검토해보았다. 연구 결과, 주의 깊은 정치캠페인 이용과 지역신문 이용은 대인커뮤니케이션의 증가를 가져왔고, 또 대인커뮤니케이션을 많이 하면 할수록, 투표참여가 높았음이 경로분석에서 드러났다. 즉, 정치참여에서 대인커뮤니케이션은 미디어로부터 얻어진 정보를 처리하는 과정에서 중요한 역할을 하는 보완적 관계임이 확인되었다. 또, 투표참여의 중요한 세 변인인 이슈, 이미지, 정당 가운데, 이미지와 정당요인이 후보자 결정에 미치는 영향을 비교분석한 결과, 정당지지와 후보 결정 간에는 높은 상관관계를 발견했지만, 후보자 이미지가 후보결정이나 투표참여로는 연결되지 못하는 것으로 나타나, 이미지 요인과 정당 요인 중 후보결정에는 정당 요인이 더 큰 영향력을 발휘했다. 또, 유권자들은 자신이 이미 선호하고 있는 정당지지성향에 따라, 상대정당 후보보다 자신의 지지정당 후보의 이미지를 모든 요인에서 높게 평가하는 경향이 있어, 인지균형이론의 적용을 보여주었다. 후보자 이미지에 대한 미디어의 차별적 효과는 부분적으로 증명이 되었다. 즉, 후보자의 이미지 중, 능력 요인은 TV 토론회, 인터넷 홈페이지, 홍보책자를 각각 주의 깊게 이용한 실험집단 간에 통계학적으로 유의미한 차이를 보였다.성연구의 차별적으로 기여하는 점은 기존의 연구는 기업의 명성을 측정할 수 있는 측정문항개발에 초점을 맞추었는데 비해서 실제 국내에서 명성을 축적한 기업을 대상으로 명성측정을 개별적으로 적용함으로써 각 기업의 명성을 계량화하고 명성을 구성하는 차원이 실제 명성에 어떻게 기여했는지에 대해서 파악했다는 점이다. 이는 실무적으로 보았을 때 홍보담당자가 자신의 기업홍보활동이 기업명성에 어떻게 기여할 수 있는가를 파악하고 경쟁기업의 홍보활동에 비해서 얼마만큼 효율적이었는지에 대한 평가기준을 제시할 수 있음을 의미하는 것이다.어에 대한 차별성 내지 특수성에 기인하는 동기들에 비해 전체적으로 강하다. 또한 기존 이론과 연구들에서 유의미한 이동전화 이용의 요인으로 제기된 사회심리적 특성들은 조사대상인 청소년들에 있어서도 큰 차이 없이 일반화가 가능한 것으로 보이며, 그 중에서도 "혁신성"과 "타인지향성"이 미치는 영향이 주목된다.X>62mL, 부분반응군 330${\pm}$136mL, 무반응군 140${\pm}$43mL, 야간 다뇨는 각각 59.3$\%$(16/27), 40.7$\%$(11/27), 0$\%$(0/27)로 야간 요량이 많을수록 유의하게 치료 효과가 좋았다(P<0.05). 일회 최대 요량은 완전반응군 236${\pm}$42 mL, 부분반응군 209${\pm}$56 mL, 무반응군 107${\pm}$36mL로 최대 요량이 많을수록 유의하게 치료 효과가 좋았다 (p<0.05). 연령, 성별, 일일 수분 섭취량, 다음, 일일 요량과 다뇨은 세 군간에 유의한 차이가 없었다. 야간 수분