본 논문의 주된 연구목적은 인구이동이 인구재분포에 미치는 영향력을 분석하기 위한 방법론적 토대를 공고히 하고, 그것을 바탕으로 우리나라 인구이동의 편향성 혹은 불균형성의 시공간적 역동성을 탐색하는 것이다. 방법론적인 측면에서, 인구이동 유효도 지수(MEI)가 순이동률(NMR)에 비해 보다 적절한 측도인 것으로 판단되었다. MEI는 NMR에 비해 측도로서의 타당도가 높으며, ‘소인구문제’로부터 상대적으로 자유롭고, 인구이동의 현재적 역동성을 파악하는데 상대적으로 유리한 것으로 평가되었다. 덧붙여 MEI는 NMR에 비해 스케일 확장성이 월등해 다중 스케일을 고려한 연구 프레임워크의 수립에 훨씬 유리한 것으로 판단되었다. MEI에 기반한 분석 프레임워크를 우리나라의 최근 25년간(1998~2022년)의 데이터에 적용하여 분석하였다. 연구 결과를 요약하면 다음과 같다. 첫째, 전역 스케일의 분석 결과, 지난 25년간 전역적 MEI 값이 대략 5~10% 안에서 변동하는 경향을 보였으며, 특정한 시계열적 패턴을 보여주었다. 둘째, 지역별 스케일 분석의 결과, MEI가 NMR에 비해 인구이동의 역동성을 파악하는데 더 적절한 도구라는 사실이 입증되었다. 셋째, 지역-특수적 스케일 분석의 결과, 특별･광역시별로 매우 독특한 인구 교환 양상의 패턴이 드러났으며, 스케일 확장성이라는 측면에서 MEI는 NMR에 비해 월등하다는 사실이 입증되었다. 넷째, 지역간 스케일의 분석 결과, 인구이동 편향성이 두드러진 플로들이 확인되었다. 본 연구에서 제시된 연구 프레임워크는 다양한 방향으로 확장될 수 있는데, 집단 개별화 연구, 다변량 기법의 적용, 보다 작은 공간단위의 연구 등이다.

99Tc is a long-lived radioactive fission product whose mobility in the subsurface is largely governed by its oxidation state. Migration of Tc from a waste repository may be prevented by immobilizing Tc(IV) in durable glass forms. Thus, efficient incorporation and high retention of Tc by glasses is very important for radioactive waste management and environmental remediation. Tc(IV) oxidation to higly volatile Tc(VII) (TcO4 −) at glass vitrification temperatures results in poor Tc retention in the final waste glass. Retention of Tc in the glass is generally improved by reducing conditions since Tc(IV) is not volatile. However, experiments with Tc-magnetite under high temperature and oxic conditions showed re-oxidation of Tc(IV) to volatile pertechnetate. To understand this phenomenon, we employed ab initio molecular dynamics simulations to study structural and electronic properties of Tc-incorporation in magnetite. The study provides the ramification of high temperature on Tc mobilization and changes of Tc retention in magnetite. Theory predictions also indicated enhanced Tc retention in the presence of 1st row transition metal dopants in Tc-incorporated magnetite that was confirmed by experiments. Furthermore, the overwhelming concentration of Cr(VI) co-mingled with Tc(VII) within the secondary waste form where Cr(VI) is more readily reduced than Tc(VII) by reduction potential metrics. Experiments with Tc-magnetite under high temperature and oxic conditions showed re-oxidation of Tc(IV) to volatile pertechnetate. Experiments also showed that magnetite transforms to maghematite resulting in disproportionation and re-oxidation of Tc. This transformation can be suppressed through incorporation of trace elements such as Co, Ni, Zn into magnetite forming spinel. In this talk, I will present results from ab initio molecular dynamics simulations and experiments on the structural and electronic properties of Tc and/or Cr incorporation in magnetite. I will also discuss the temperature effect on Tc/Cr mobilization and changes of Tc/Cr retention in magnetite. In addition, I will discuss the effect of Tc/Cr concentration and 1st row transition metal dopants on their incorporation in magnetite.

Introduction Social media marketing is an attractive marketing method for fostering relationships with customers. About 30% of social media users find social networking sites important when searching for information about brands as well as showing their support towards them (Nielsen, 2017). This engagement with brands on social media is one of the factors driving company outcomes. For example, consumer engagement in social media brand communities is found to have a positive impact on purchase spending (Goh, Heng, and Lin, 2013), brand equity (Christodoulides and Jevons, 2012), and brand attitude (Schivinski and Dabrowski 2016). Consumer engagement involves both consumer interaction and co-creation of the content (Smith and Gallicano, 2015). In order to enhance engagement with brand content, marketers must persuade consumers to interact with those messages by sharing, commenting or liking them (Chang, Yu, Lu, 2014). Hence, interaction is the crucial step towards improving consumer engagement. While marketers rely on experimenting in order to find elements that drive consumer interaction, researchers use vast social media data in order to examine relationships between brand message characteristics and consumer interaction with those messages. For example, (Vries, Gensler, and Leeflang, 2012) studied the impact of post’s vividness, interactivity, content, position of a post and valence of comments on brand post popularity as represented by number of likes and comments. Other researchers such as (Wang et al ,2016) examined the impact of topic, tone and the length of post on social media engagement defined not only by the number of likes and shares, but also by the likability of characters featured in the post. Chang, Yu, and Lu (2014) studied how argument quality, post popularity, and post attractiveness can lead to consumer engagement. Similarly, (Lee and Hong, 2016) investigated the impact of emotional appeal, informativeness and creativity of a message on positive consumer behavior towards brand message. However, little is known so far about the effects of the frequency and spacing of brand-generated content on the dynamics of consumer interaction. Advertising research shows that advertising frequency has an impact on various consumer behavior and attitude outcomes and suggests that there is an optimum level of exposure to advertising that yields greatest results (Schmidt and Eisend, 2015; Broussard, 2000). Moreover, research on advertising repetition in traditional channels suggests an inverted u-shape relationship between ad repetition and message effectiveness. This happens because at a certain number of exposures negative factors, such as boredom and irritation (Heflin and Haygood, 1985), kick in and overweigh positive ones. As a result, the effectiveness of an ad starts diminishing. This effect is also known as the wear-out effect. On the other hand, (Lee, Ahn, and Park, 2015) suggest that inverted U-shape relationship between repetition and attitude towards the brand does not hold true in online environments. This is the case because users can control their exposure to advertising, therefore they do not expose themselves to the ad to the extent that they feel adverse toward it. As firm-generated brand content on social media is a form of advertising, it is interesting to examine, whether wear-out effect occurs in the context of social media and user interaction. In addition, the effect of advertising repetition is found to depend on the time period, or space, between ad exposures (Janiszewski, Noel, and Saywer, 2003). Spacing between exposures affect learning (Sawyer, Noel, and Janiszewski, 2009), attitude towards the brand (Schmidt and Eisend, 2015), purchase spending (Sahni, 2015), attrition rate and customer response (Dreze and Bonfrer, 2008). Moreover, recent study by (Wang, Greenwood, and Pavlou, 2017), who investigated the influence of posting on the propensity to unfollow the brand on the largest social media in China WeChat, found that posting leads to higher likelihood of unfollowing the brand, which in turn has a negative effect on the long term sales. However, WeChat may be considered to be more intrusive than Facebook because of the differences in how followers get notified about new brand posts. Therefore, it is interesting to examine whether the same effect of posting holds true on Facebook. Finally, viral marketing research suggests that the growth rate of interaction with the content depends on the rate of creation of other messages (Karnik, Saroop, and Borkar, 2013). Based on the findings from previous studies, it is evident that frequency and spacing may have a significant influence on the level and growth rate of user interaction. Furthermore, two-sided advertising research suggests that inclusion of negative information in product related messages can yield better results in terms of persuasive power than if no negative information is included (Eisend 2006). In addition, political communication researchers found that sentiment-carrying Twitter messages tend to be retweeted more often and more quickly (Stieglitz and Dang-Xuan, 2013). Therefore, it is suggested that the effect of message frequency and spacing on the level of consumer interaction is moderated by the sentiment of the message. In other words, the optimal level of message frequency is expected to be higher for emotionally-charged firm-generated brand messages as compared to neutral ones. Hence, the following research questions are proposed: RQ1: How does frequency and spacing of brand-generated content affect the dynamics of consumer interaction on social media and how is this effect moderated by the sentiment of the content? RQ2: How does posting on social media affect the unfollowing by brand followers? RQ2a: Does the spacing between messages help reduce the negative effect of posting on the unfollowing by brand followers (if such effect is present)? Research Design & Theoretical Development In order to answer these questions two data sets were gathered via Facebook’s API consisting of 6,471 and 932 brand posts respectively. Two separate data sets were needed to examine the frequency effects on the overall level of consumer interaction as well as on the growth rate of interaction. Therefore, post and page data for 7 international brands from 5 different product categories for the period of 2 years were collected to examine the frequency effects. To investigate the effect of posting on the growth rate of consumer interaction, 11 brands were tracked for the 7-week period in order to capture the development of the interaction. In addition, the impact of posting on the propensity to unfollow the brand was examined. Consequently, three separate regression models were built to test the hypotheses. Results showed that frequency of posting and the level of consumer interaction has an inverted u-shape relationship and that the level of consumer interaction is positively influenced by the space between the posts. Further, findings suggest that posting on social media is positively associated with unfollowing by followers and that the growth rate of interaction of the post depends on the rate of new message generation by the same brand. The conceptual model is presented below. Result and Conclusion The study has few theoretical and practical contributions. Answering to the call for research (Vries, Gensler, and Leeflang, 2012) to include the dynamic aspects of interaction, this study contributes to the social media literature by examining the effects of the rate of new message generation on the growth rate of interaction of the post. In addition, this study adds to the stream of research on the wear-out effects in online environments by including higher number of exposures and by testing the type of firm communication (social media communication) that previously has not been studied. Finally, this study contributed to the recent research (Wang, Greenwood, and Pavlou, 2017) by examining the effect of posting on the unfollowing by brand followers. As for practical contributions, findings of this study have implications for marketing managers with respect to the frequency and spacing of posting. This study provides evidence for a more moderate posting strategies in terms of frequency.

The study aims at quantifying the effect of nano technology in the fields of economics and social aspects by using the methodology of system dynamics. A case study which using selenium oxide nanoparticles as additive agent in order to enhance fuel efficiency was selected as an example of nano technology in economic and societal benefits. Additionally, models for exhaust gas from combustion of fuel (diesel) and related issues are developed to evaluate real-time assessment of the effect of nano technology. It was found that the selenium oxide nanoparticles increase fuel efficiency, and it also affects on the amount of exhaust gas and the respiratory disease related issues. The results of this study which give quantitative value for the effect of nano technology can be used as objective references in development of national policy.

미소갑각류 군집과 이화학적 요인 간의 관계를 파악하 기 위해 우포늪에서 2001년부터 2010년 동안 2주 간격 으로 조사를 수행하였다. 조사 시간 동안, 총 10속의 지 각류가 동정되었으며, 서식 형태에 따라 구분된 부착성 지각류(Alona, Camptocercus, Simocephalus, Diaphanosoma, Sida)와 부유성 지각류(Bosmina, Ceriodaphnia, Daphnia, Moina, Scapholeberis)의 연 출현이 매우 상이한 것으로 나타났다. 부유성 지각류는 봄과 가을 시기에 높은 밀도로 나타났으며, 부착성 지각류는 여름 시기에 상대적으로 높은 밀도를 보였다. 요각류 성체와 유생 또 한 부착성 지각류와 유사한 계절적 분포 경향을 나타내 었다. 부유성 지각류는 강우량과 이화학적 요인과 상관성 을 보이지 않았으나, 부착성 지각류는 이화학적 요인 중 수온과 뚜렷한 상관성을 보였다(n=120, p⁄0.01). 특히 부착성 지각류 중 Chydoridae는 강우량 및 수온과 양의 상관관계를(n=120, p⁄0.01), 용존산소와 전기전도도와 는 음의 상관관계를 나타냈다(n=120, p⁄0.05). 요각류 군집은 강우량(n=120, p⁄0.01) 및 수온(n=120, p⁄0.05) 과 양의 상관관계를 나타내었다. 결론적으로 우포에서 강 우량은 미소갑각류 군집 분포를 결정하는 매우 중요한 요인인 것으로 파악되었다.

Impact of artificial illumination on zooplankton dynamics has been studied in Tongyong marine ranch during the period from August 1998 to August 1999. Monthly sampling has been carried out to collect zooplankters from both natural waters and artificially

In the globalization and free trade era, the current account deficit problem is a common phenomenon experienced by most countries, both developing and developed countries. Also with managed floating regime of exchange rate, it becomes very important to analyze the dynamics of current account balance which determine the trade. The deficit condition has lasted for four years in Indonesia, as well the deficit value above the value of the surplus that has been experienced during the period 2005-2011. This study is firstly aim to examine the condition of the deficit which happens in the export and import, manufactured goods and oil and gas, whether related to the transaction of goods and services. We try to build a predicted model which near the actual. Then, the focuses examines an exchange rate volatility impact on current account deficit. The model used in this research is a simultaneous model of Indonesia current account deficit from 2005 to 2014. The simulation result indicated that depreciation increase surplus to current account deficit. The decrease of export manufactured goods (non oil and gas) higher than the increase of import. For the oil and gas sector, depreciation of the rupiah against the US dollar results in an increased burden of higher oil and gas imports due to import transactions.