Digital allies : preserving national security through signals intelligence cooperation within the UKUSA agreement

이진솔 Seoul National University 2016 국내석사

The disclosure of the global surveillance practices of five democratic nations shook the world in June 2013. Though some were content with official justification as a matter of national security, many more were concerned with the implications these oversight abilities had on individual privacy and the possibility of a surveillance state. Using information released on the document disclosures from 2013 to 2015, the following thesis researches the impact mass surveillance practices and signals intelligence have had on the concept of national security and analyzes how democracies utilize signals intelligence data to fulfill their national security goals. This thesis focuses on the current national security strategies of the United States and United Kingdom, comparing each nation’s usage of signals intelligence, post-Snowden actions, and subsequent domestic response. Based off of these findings, this thesis analyzes and critiques the current strategy of mass surveillance practices as utilized by democratic states, proposes policies to promote better practices, and discusses the concept of individual privacy in the context of national security.

Elemental analysis of caries-affected root dentin and artificially demineralized dentin

성영혜 Seoul National University 2016 국내박사

Elemental analysis of caries-affected root dentin and artificially demineralized dentin Younghye Sung Program in Conservative Dentistry Department of Dental Science Graduate School, Seoul National University (Directed by Professor Ho-Hyun Son, D.D.S., M.S.D., Ph.D.) Objectives This study aimed to analyze the mineral composition of naturally- and artificially-produced caries-affected root dentin and to determine the elemental incorporation of resin-modified glass ionomer (RMGI) into the demineralized dentin. Materials and methods Box-formed cavities were prepared on buccal and lingual root surfaces of extracted sound human premolars (n = 15). One cavity was exposed to a microbial caries model using a strain of Streptococcus mutans. The other cavity was subjected to a chemical model under pH cycling. Premolars and molars with root surface caries were used as a natural caries model (n = 15). Outer caries lesion was removed using a carbide bur and a hand excavator under a dying technique and restored with RMGI (Fuji Ⅱ LC, GC Corp.). The weight percentages of calcium (Ca), phosphate (P), and strontium (Sr) and the widths of demineralized dentin were determined by electron probe microanalysis and statistically analyzed using ANOVA and Tukey’s post hoc test (α = 0.05). Results Demineralized surface was observed under SEM in all samples. Artificial models induced greater losses of Ca and P and larger widths of demineralized dentin than did a natural caries model (p < 0.05). Sr was diffused into the demineralized dentin layer from RMGI. Conclusions Both the microbial and the chemical caries models produced similar patterns of mineral composition on the caries-affected dentin. However, within the limitation of this study, the artificial lesions had a relatively larger extent of demineralization than the natural lesions. Sr from RMGI was incorporated into the superficial layer of the caries-affected dentin.

(The) roles of government in incubating internationally competitive industrial clusters : the case studies of Newly Industrialized Economies (NIEs) and implications for Cambodia

Pichnorak, Siem Seoul National University 2018 국내석사

Abstract The Roles of Government in Incubating Internationally Competitive Clusters: The Cases of Newly Industrialized Economies (NIEs) and Implications for Cambodia Siem Pichnorak Graduate School of International Studies Seoul National University The importance of cluster effects on improving national competitiveness has been widely acknowledged and thus attracted a great deal of attention from researchers and policy makers. Amongst different actors, government has been recognized as one of the most important actor in the development of cluster, at least at the early stage of cluster evolution. In line with this argument, this thesis seeks to examine the important roles government could play in incubating internationally competitive industrial clusters and draw implications for the future development of industrial cluster in Cambodia. This thesis will be organized into three important discussions. The first discussion revolves around the necessary roles of government in incubating internationally competitive industrial clusters. Second, some implications in terms of the roles of government in incubating Daedeok Innopolis in South Korea and Hsinchu Science Park in Taiwan (China) will be discussed. Drawing from the discussion on the roles of government in incubating competitive industrial clusters and the two case studies, the last part will discuss potential lessons from which Cambodian government could learn in terms of cluster development along with some policy suggestions. Keywords: industrial clusters, government, public policy, Newly Industrialized Economies (NIEs), national competitiveness, industrialization

Associations between hourly PM2.5 chemical constituents and emergency department visits for cardiovascular and respiratory disease

엄희상 Seoul National University 2016 국내석사

Introduction : Several epidemiological studies have investigated fine particulate matter (≤ 2.5 μm in aerodynamic diameter, PM2.5) has a risk for adverse effects on human health. Previous studies have focused on the risk associated with the total mass of particles, without considering the chemical constituents of them. In this study, the hourly differences between PM2.5 chemical constituents and emergency visits for cardiovascular disease and respiratory disease were estimated using time-stratified case-crossover design. Methods: The study periods were from January 1 to December 31, 2013 in Seoul, Korea. Hourly health outcome data on emergency department visits for cardiovascular disease and respiratory disease were provided by National Emergency Department Information System (NEDIS). Emergency department visits data were classified according to the discharge diagnosis for cardiovascular disease and respiratory disease (ICD-10, cardiovascular, I00-I99 and respiratory, J00-J99). Hourly data for PM2.5 mass and chemical constituents were measured by real-time monitoring at one sampling site located at Bulgwang-dong, Seoul (37.36° N, 126.56° E). In this study, PM2.5 mass and only 13 chemical constituents (OC, EC, Cl-, Mg2+, Na+, NH4+, NO3-, SO42-, Ca, Fe, K, Pb, and Zn), were selected after QA/QC procedure. The meteorological data such as hourly mean temperature (℃), relative humidity (%), and air pressure (hPa) were adjusted as confounding variable. Time-stratified case-crossover analysis and conditional logistic regression analysis were used to estimate the adverse health effects of fine air particles and to estimate and adjusted odds ratio (ORs) and 95% confidence intervals (CIs), respectively. The short-term effects were estimated using moving averages in six periods (1-6(h), 7-12(h), 13-18(h), 19-24(h), 25-48(h), 49-72(h)) and adjustments of this association by age (≥ 65 years) and season. Results and Discussion : The strongest adverse effects for cardiovascular disease exacerbations were associated with PM2.5 mass, OC, EC, Cl-, Ca, Fe and Zn after 19-24h lag period and NH4+, NO3-, and SO42- after 25-48h lag period were estimated. The strongest adverse effects for respiratory disease exacerbations were associted with NO3-, K and Pb after short lag periods (0-6h and 7-12h) and PM2.5, OC, EC, Cl-, NH4+, SO42-, Ca, Fe, and Zn after longer lag periods (19-24h and 25-48h). For those older than ≥ 65 years, the strongest adverse effects for cardiovascular disease exacerbations were shown with PM2.5 mass, OC, EC, Cl-, Ca, Fe, and Zn after 19-24h lag period and NO3- after 25-48 h lag period and respiratory disease exacerbations of OC, EC, Fe and Zn after 19-24h lag period were observed. Especially, among PM2.5 chemical constituents, EC showed the strongest association with cardiovascular disease and respiratory disease exacerbations. For all of seasons, significant positive associations for PM2.5 mass and chemical constituents excluding Mg2+ were observed for cardiovascular and respiratory disease. Conclusion : This study found major differences of associations between PM2.5 constituents and emergency visits for cardiovascular and respiratory disease in Seoul. This study will provide robust evidences for the health impacts of PM2.5 chemical constituents.

(The) role of the international criminal court in peace development in D.R. Congo since 2004

Asianande, Thierry Kisukulu Seoul National University 2019 국내석사

논문초록 본 연구는 지각적 측면에서 국제형사재판소의 콩고민주공화국 평화구축과정에대한 역할을 조사하고자 한다. 특히, 본 연구는 콩고의 국내기구 강화를 통한 평화보장에 있어 국제형사재판소의 역할과 영향에 대한 콩고 시민들의 인식을 살펴보고자 한다. 본 연구의 방법론으로는 양적 및 질적 접근 방법 동시에 사용하는 삼각 측량 설계를 채택하였다. 또한, 인권 운동가, 변호사, 지역 오피니언 리더 및 학생으로 구성된 150 명의 응답자를 샘플링하기 위해 목적 및 층화 샘플링 기술을 조합하여 사용하였다. 수집 된 데이터는 백분율 및 빈도와 같은 설명 분석 통계를 사용하여 분석되었으며 SPSS, 버전 20 소프트웨어의 기여와 함께 그래프 및 표 형식으로 제공되고 국제형사재판소의 대표 및 언론인, 시민단체 대표 등의 인터뷰를 통해 수집된 전문가의 견해에 의해 뒷받침되었습니다. 이 연구의 핵심 연구 결과는 세 가지 가설을 입증했다. 첫째, 콩고 시민의 태도와 국제형사재판소의 역할 사이에 부정적인 관계가 있음을 발견했다. 시민들의 부정적인 태도는 국제형사재판소로부터의 높은 기대와 카빌라 대통령의 권력에 대한 대안으로 간주되는 콩고 인물인 장 피에르 벰바 (Jean Pierre Bemba)를 체포하겠다는 법원의 결정에 기인 한 것이다. 둘째,이 연구는 국제형사재판소의 개입이 평화 보장을위한 국내 기관의 강화에 중요하다는 사실을 발견했다. 국제형사재판소는 콩고의 국내법을 국제형사재판소의 협약에 적용하기 위해 도입 된 다양한 제도 개혁으로 콩고 법령 전체를 수정했다. 마지막으로이 연구는 국제형사재판소가 콩고 민주 공화국에 개입 한 것이 전반적인 평화 구축 과정에 영향을 미쳤음을 입증했다. 군대와 민병대에서 아이들을 사용하는 주요 범죄자들의 체포는 아이들이 군대에 사용되어서는 안된다는 인식을 높이고있다. 따라서 다른 무장 단체 등에서 아동의 사용을 줄이는 데 기여했다. 본 연구의 실질적인 의미는 콩고 민주 공화국의 평화 구축 과정에서 국제형사재판소의 역할이 효과적인지 확인하는 것이다. 실마리어: 국제형사재판소, 평화구축, 분쟁 후 사회 ABSTRACT The Role of the International Criminal Court in Peace Development in D.R. Congo since 2004 Thierry KISUKULU ASIANANDE International Area Studies Graduate School of International Studies Seoul National University The purpose of this study was to understand whether or not the role of the International Criminal Court (ICC) is effective in peace building process in DR Congo. Specifically, the study looked at the attitudes of Congolese citizens towards the work of ICC, the influence of ICC on strengthening domestic institutions to guarantee peace, as well as the overall promotion of peace in DR Congo. The study adopted concurrent triangulation design that promoted the use of both quantitative and qualitative approaches. A combination of purposive and stratified sampling techniques was used to sample 150 respondents comprising of: human rights activists, lawyers, local opinion leaders, and students. Data collected was analyzed using descriptive analysis statistics like percentages and frequencies, and presented in form of graphs and tables with the contribution of the Statistical Package for Social Sciences (SPSS, Version 20) software, and backed up by views of experts such as representatives of civil society, representatives of ICC, and journalists, collected from interviews. The study key findings proved two hypotheses out of three. Firstly, the study found a negative relationship between attitudes of Congolese citizens and the role of ICC. The negative attitude of citizens was attributed to their high expectations from ICC, and the court’s decision to arrest Jean Pierre Bemba, a Congolese personality considered as the alternative to power of President Kabila. Secondly, the study accepted that interventions by ICC were significant in strengthening domestic institutions to guarantee peace. Further findings revealed that ICC has modified the entire Congolese legal order with a range of institutional reforms, introduced to adapt Congolese law to the agreement of ICC. Finally, the study judged the ICC’s involvement in DR Congo influential in overall peacebuilding processes. It found that arrests of key criminals for use of children in armed forces and militia groups has increased awareness that children should not be used in armed forces; therefore, contributed to narrowing use of children in different armed groups, etc. The substantial implication of this study is the acceptance of the role of ICC as effective in peacebuilding process in DR Congo. Key Words: International Criminal Court, Peace Development, post-conflict Society

(A) study on the marine prokaryotic diversity and antibiotic resistome using high-throughput sequencing and functional metagenomic analysis

장광일 Seoul National University 2016 국내박사

Prokaryotes (Bacteria and Archaea) play a significant role in global biogeochemical flux of biologically important elements in marine ecosystems. It has been firmly established that prokaryotes are major primary producers and heterotrophic consumers. Despite prokaryotes have significant roles in the biogeochemical flux in marine environmets, it has been estimated that more than 99% of the bacteria are non-culturable, leading to limited information of prokaryotic diversity because of an inability to mimic proper environmental niches. The relation between prokaryotic communities and their roles in the biogeochemical cycle is a topic of central research in environmental microbiology. Knowledge of the prokaryotic community compositions has rapidly increased due to development of molecular techniques based on amplification of the 16S rRNA gene and sequencing. This thesis includes studies on i) seasonal and spatial distribution of diversity of marine prokaryotes in the East Sea using pyrosequencing, ii) marine bacteria can be dispersed in the atmospheric environments, and iii) diversity of antibiotic resistance genes in the water column of the East Sea using the functional metagenomics approach. i) To understand in-depth prokaryotic diversity using high-throughput sequencing technique, we applied a pyrosequencing approach to study spatial and seasonal distribution of prokaryotes in the East Sea during 2011-2014. This study demonstrates that bacterial and archaeal communities varied along horizontal scale from coastal to offshore as well as vertical scale along depth, and furthermore their distribution patterns were different between seasons. Bacteroidetes, Alpha- and Gamma-proteobacteria dominated from epipelagic to mesopelagic zones in the East Sea. However, the discrepancy must be resulted from the low coverage of used primer for a major Alpha-proteobacteria group (SAR11). Thaumarchaeota and Euryarchaeota were dominant archaea in the epipelagic zone (0-100 m). Euryarchaeota decreased gradually with increasing depth. We found that dominant archaeal groups such as Nitrosopumilaceae and Halobacteria were more dynamics of distribution patterns in the epipelagic zone than in the mesopelagic zone. ii) Rainwater is an important natural resource to study airborne marine bacteria. Rainwater samples were collected during three heavy rain events at a suburban site in Seoul. Bacterial community compositions (BCCs) of rainwater samples, analyzed by using 16S rRNA gene-based pyrosequencing, differed considerably among the three rain events. Presumable marine bacterial OTUs which formed a robust clade with marine bacteria Lacinutrix spp. were at high concentrations in rainwater in April, likely reflecting origin from saline environments. Most of the Flavobacteria sequences were unusually high in April rainwater, which presumed to be of marine origin. Thus, these results suggest that some marine bacteria can be disseminated as aerosol particles and precipitated on land via rain. iii) The antibiotic resistance (AR) issue has critically increased. With the increasing use of antibiotics, resistance to antibiotics is developed by bacteria having AR mechanisms to defend themselves and survive from the antibiotic-polluted environments. Functional metagenomic approach is more useful to discover novel AR genes and resistance mechanisms rather than culture-dependent approaches, PCR and sequencing methods. We found a variety of AR genes conferring resistance to ampicillin, polymyxin B, rifampicin, fosfomycin and gentamicin in the East Sea. Among antibiotics, the majority (53.4%) of the cloned resistant genes was resistant to ampicillin, 18.8% to polymyxin B, 16.1% to rifampicin, 7.2% to fosfomycin and 4.5% to gentamicin. The source of host organisms inferred from the annotated AR genes was mainly marine bacterial taxa. This thesis suggested that bacteria might play a more significant role in marine environments. Bacterial community compositions in the East Sea varied across space and seasons. Furthermore, some marine bacteria can disperse in the atmospheric environments. Marine environments may be potentially global reservoir of AR genes.

Ensuring energy security beyond conventional boundaries : three essays on energy security with geopolitics, bargaining power and market structure

류하늬 Seoul National University 2016 국내박사

This study seeks to introduce a methodology for analyzing the fundamental cause of fossil fuel procurement in order to accurately explain the current phenomenon beyond traditional interdisciplinary boundaries. The concept of “non-traditional security” has gained increasing importance as the international community has begun to recognize that the promotion of security requires not only maintenance of territorial and military security of state but also safeguarding of human communities from all threats, including unconventional, non-military risks at the supra-, inter-, and intra-state levels. It can be emphasized that energy security through the lens of human security focuses on spreading loss deeply and widely. In order to avoid energy insecurity, inter-state cooperation or supra-state actors are needed. Even though non-security issues have become increasingly common in almost all aspects of society, fossil fuel procurement remains an important goal of the nation-state. Furthermore, fossil fuel procurement results in geopolitics factors. This research aims to examine and explain the current state of fossil fuel procurement based on the understanding that there are overlapping perspectives regarding energy security between resource economics, international political economics, and geopolitics. First, the research attempts to provide a rationale for comparing the options for potential pipeline construction in Northeast Asia, and to explain the debate about realistic options for Northeast Asia. In addition, the proponents of pipeline natural gas (PNG) gas supply have begun to recognize the significance of non-traditional issues, which require cooperation from each state to promote regional security, although traditional security concerns still dominate the agenda of governments in terms of access through territorial borders and route decisions. To consider the linkage structure, network game and the link-based flexible allocation rule are applied to determine the benefits and bargaining power of Northeast Asian pipeline construction options. This could establish that the pipeline linkage structure comprises different values depending on which country participates in the pipeline coalition comparing the value of each route, the value allocated to each country, and their relative bargaining power. Consideration of the first mover could explain the reason for selecting the Russia–China–South Korea route or the Russia–North Korea–South Korea route in the decision on Northeast Asian pipeline. Second, this study attempts to identify the factors that determine the contract price of Europe’s long-term contract, and to figure out to what extent this would affect the contract price. Gas sales and the purchase agreement are dealt with at the firm level, even though the characteristics of natural resources primarily represent a strategic or politicized commodity of the nation-state, making the contract price an issue that should be dealt with at the national level. This study introduces LASSO analysis and double selection in order to establish the factors among potential variables that determine the long-term gas contract price. This alternative approach is motivated to figure out the price-determining factors in bilateral long-term gas supply contracts that display high-dimensional data and that underwent difficulty in conventional estimation. With respect to bargaining power, the state of a consumer country’s market structure is a pivotal factor responding to the supplier’s priority in the bilateral long-term contract. The results of our study signify that there is a room for buyers to negotiate preservation of loss arising from transportation costs. Factors that are assumed to have influence over the bargaining power of supplier and consumer countries during negotiations inherently have geopolitical characteristics. Third, this study attempts to determine the relationship between energy security and the institutional environment in the generation sector. It is an attempt to expand the security dimension to include intra-state energy delivery issues. The effect of liberalized restructuring—entry liberalization, privatization, and vertical divestiture—on the supply reliability in four separate sub-sectors of the electricity industry is evaluated empirically. This study attempts to establish how energy security is related to the restructuring of the electricity industry in the generation sector through the random effect model. Institutional change that is originally intended to enhance efficiency could depart from the initial goal in the generation sector.

(An) analysis of interactive media ettect in exhibition

선태영 Seoul National University of Science and Technolog 2018 국내석사

The trend of cultural art spaces is changing due to the rapid advance in technology. The purpose of this study is to understand which kind of interactive exhibition technology is being used in exhibition space and to gain a foothold for applying technologies in exhibition spaces effectively. The range of the study is limited due to the exhibition spaces which are focused on interactive exhibitions. Through exhibition what will the visitors learn and gain through education. In this essay, eight cases are chosen for the target exhibition space in Seoul. The study is understanding interactive exhibition and present conditions of exhibition environment. Also, research and survey on whether the type of interaction design performs an effective function and role of exhibition space which the visitors want. Second, the study was to know what types and functions of an interactive exhibition based on the understanding interactive exhibition are the methods. The third way is to analyze and synthesize the characteristics of exhibition spaces through the case investigation. In conclusion, interactive exhibition spaces were displayed in various ways. The results of the case investigation varied and had some limits. However, more items of the interactive exhibition should be developed to stimulate more senses and to make exhibitions more effective in spaces in the future. 문화예술 공간의 추세는 기술의 급속한 발전으로 인해 변화하고 있습니다. 본 연구의 목적은 전시 공간에서 어떤 종류의 전시 기술이 사용되고 있는지를 이해하고 전시 공간에 효과적으로 기술을 적용 할 수 있는 기반을 확보하는 방법을 찾고자 합니다. 전시회를 관람을 하는 방문객들이 인터랙티브 정보를 통해 무엇을 얻을 것인가에 대해 연구하였습니다. 이 연구에서는 인터랙티브 전시 공간으로 연구 범위를 제한하였습니다. 이 연구에서는 서울 전시 공간을 대표하는 8 가지 사례를 선정하였습니다. 우선, 아날로그 전시 및 인터랙션 전시 환경의 현상에 대해 알아봤습니다. 또한 인터랙션 디자인 유형의 전시가 방문자가 원하는 전시 공간의 효과적인 기능과 역할을 수행하는 여부에 대한 조사를 했습니다. 인터랙티브 전시 공간 방식에 대한 이해를 바탕으로 인터랙티브 전시의 유형과 기능을 파악해보았습니다. 이러한 사례 조사를 통해 전시 공간의 특성을 분석하고 종합하였습니다. 그리고 대화형 전시 공간은 다양한 방식으로 전시되고 있었습니다. 사건 조사의 결과는 다양했고 몇 가지 한계가 있었습니다. 그렇기 때문에 더 많은 감각을 자극하고 미래의 공간에서 전시회를 보다 효과적으로 만들기 위해 더 많은 양방향 전시가 개발되어야합니다.

Comparative research on copyright protection of reality television programs in China and Korea

치신 Seoul National University 2017 국내석사

ABSTRACT Comparative Research on Copyright Protection of Reality Television Programs in China and Korea Qi Xin College of law, law The Graduate School Seoul National University With the fast development of Television broadcast and Internet technologies, there are various ways provided for people to enjoy interesting TV programs. Nowadays, it shows an increasing demand of people for high-quality TV shows. Both China and Korea governments are encouraging and promoting culture and entertainment industries by setting political strategies and legislation. On one hand, highly developed contents industry can bring a thriving and happy mental life for people and make a country identical and reputable in international societies. On the other hand, compared to manufacture industry, with a comparatively low invest, a highly developed contents industry brings out huge monetary benefits for one country in a very environmental-friendly way. It’s said by a research institute that contents industry is one of the most promising industry in near future days. As a country which has a relatively strong and developed contents industry, Korea manufactures and exports to other countries movies, dramas and TV programs every year. The legislators and policy makers paid attention to and made related laws and policies to support entertainment industry of Korea. The main laws are as below: Copyright Law(저작권법); Contents Industry Promotion Law(콘텐츠산업 진흥법); Culture Industry Promotion Basic Law(문화산업진흥 기본법) and so on. China is really a huge market for TV broadcasting operators with a large number of population and a wide land. But in the aspect of protection of TV programs, the law is vague and uncertain. Copyright Law or Unfair Competition Law is the main tool for TV program producers to seek protection for their works. In recent years, especially from 2013, china TV broadcasting stations begin to buy the license of copyright of Korean TV programs. In 2014, Chinese TV stations imported nearly 70 foreign TV shows, among which Korean TV shows charge 10, nearly 15% of the total amount. <Running man><I’m a singer><Where are you going, dad> and other TV programs made great success and became the hottest TV shows in China. As the show is getting more and more popular, the copyright license royalty is also increasing. As reported, before 2014, the license fee to Korean stations is usually between 10 to 30 thousands US dollars per episode. After a big success, some TV programs even cost as expensive as 10 times. China has the condition to buy copyrights, whereas Korea aims at the huge market of China, both of which contribute to the explosive growth of copyright transaction. In this thesis, I will concentrate on arguing the following things. Firstly, I will analysis the definition and legal character of format. Should it be protected by copyright law? Secondly, I introduce the situation of legal protection of format in China, Korea and U.S. Lastly I will provide some practice strategy for format holders to protect the format besides the Copyright Law.

Community-based health insurance in ethiopia : enrollment, memebrship renewal, and effects on health service utilization

Atnafu, Ayalneh Asmamaw Seoul National University 2018 국내박사

Community-Based Health Insurance in Ethiopia: Enrollment, Membership Renewal, and Effects on Health Service Utilization Ayalneh Asmamaw Atnafu Dept. of Health Care Management and Policy The Graduate School of Public Health Seoul National University Background: Community-Based Health Insurance (CBHI) received a considerable attention as a mechanism of health care financing and a potential alternative for a user fee in many low and middle-income countries. The Ethiopian government has introduced different measures to implement pre-payment schemes including CBHI as of 2010. In this dissertation, three sub-studies were designed and implemented to explore 1) The determinants of CBHI enrollment, 2) the magnitude and factors associated with CBHI membership renewal, and 3) the association between CBHI enrollment and health service utilization in Northwest Ethiopia. Methods: The main research design of the study was a case-comparison community based cross-sectional household survey linked to the health facility survey supplemented with a concurrent qualitative component. The study populations were all eligible households for CBHI in 15 selected clusters in five districts. A multi-stage cluster sampling was employed to obtain a representative sample for the three sub-studies. Applying a structured questionnaire, 2,008 households and 7 health centers were surveyed. Additionally, 8 focus group discussions (four with CBHI members and four with non-members) and 5 in-depth interviews were conducted to supplement the quantitative findings. A classical multivariate logistic regression, mixed-effect logistic regression, and bivariate-probit regression along with a thematic analysis of the qualitative data were used for the data analysis. Results: The findings from the enrollment study showed that household-related factors such as age, education, self-rated health status, perceived quality of health services, household size, knowledge and information (awareness) about CBHI were the main influential factors affecting enrollment into CBHI in the study area. Additionally, participation in informal associations, such as local credit associations, and health facility factors in terms of availability of laboratory tests significantly influence probability of enrollment. The findings from the membership renewal study showed that 36% of the participants were not willing to renew their membership for the next period. The results confirmed that once the households are enrolled in CBHI, factors related to institutional trusts, such as trust in public health facilities and trust in CBHI schemes, and inconvenience of the premium collection were the main influential factors to renew membership. Moreover, poor self-rated health status and perceived quality of healthcare services are correlated with membership renewal. Hence, there is a possibility of adverse selection with regard to CBHI enrollment and membership renewal in the study area. The third study revealed that CBHI enrollment is positively associated with adult outpatient use, inpatient care, and sick children health services visits. CBHI membership shows 0.50 (50%), 0.22 (22%), and 0.44 (44%) points higher probability of health service visits for adult outpatient, inpatient, and sick children’s health problem in the study area, respectively. Conclusion and recommendation: The study results in this thesis demonstrated important factors affecting CBHI enrollment and membership renewal. Moreover, it also revealed the link between CBHI enrollment and health service utilization. Therefore, multifaceted policy interventions need to be considered before the nationwide rollout of CBHI and implementation of Social Health Insurance (SHI) in Ethiopia. Strategies such as compulsory enrollment, differential premiums, and group enrollment are essential to tackle adverse selection. Provision of continuous education and social marketing activities to increase enrollment and maintain the sustainability of the schemes are crucial. Policy interventions that enhance the capacity of health facilities and CBHI schemes to provide the promised services to the members and build trust are also necessary. Benefit package expansion and other supply-side interventions are required to strengthen the positive effect of CBHI on health care utilization. Keywords: Adverse selection, Bivariate probit model, CBHI enrollment, Ethiopia, Health care use, Institutional trust, Membership renewal, Mixed-effect model, Mixed method Student number: 2014-31499