당뇨망막병증 검진에 있어 무산동 디지털 안저사진기의 효용성

이대웅,배정훈,송수정.Dae Woong Lee. MD. Jeong Hoon Bae. MD. Su Jeong Song. MD 대한안과학회 2011 대한안과학회지 Vol.52 No.5

Purpose: To evaluate the efficacy of a single field, non-mydriatic, 45° digital photography as a diagnostic tool for diabetic retinopathy. Methods: A total of 303 consecutive diabetic patients (606 eyes) who underwent digital fundus photography and indirect ophthalmoscopy were included in the present study. The optical discs and macular area of all patients were subjected to single fundus photography using a non-mydriatic 45-degree digital fundus camera. All patients also underwent fundus examinations after pupil dilation via indirect ophthalmoscopy. Results: The sensitivity and specificity for determining diabetic retinopathy were 47.6% and 97.6%, respectively. The false positive rate, false negative rate, positive predictive value, and negative predictive values were 2.3%, 2.1%, 45.5%, and 97.8%, respectively. Among the digital fundus images, 12.9% (78 eyes) were non-gradable. The patients with non-gradable digital fundus images were older (p < 0.001), had a longer duration of diabetes, (p < 0.001) and more often suffered from systemic hypertension (p = 0.003) compared to patients with gradable photographs. Conclusions: The present study showed that single-field, non-mydriatic, 45 degree digital photography for detecting diabetic retinopathy had relatively low sensitivity and high technical failure rates. The failure rates could be improved with higher resolution non-mydriatic wide-field photography cameras and with additional peripheral images for diabetic retinopathy screening. J Korean Ophthalmol Soc 2011;52(5):531-536

제2형 당뇨병 환자에서 당뇨망막병증에 대한 지식 및 인지도조사: 서울시 당뇨병예방사업 설문 조사결과

이대웅,박철영,송수정,Dae Woong Lee,Chul Young Park,Su Jeong Song 대한안과학회 2011 대한안과학회지 Vol.52 No.11

Purpose: To investigate the knowledge and awareness level of diabetic retinopathy (DR) in type 2 diabetes patients. Methods: A total of 437 participants with diabetes were recruited in the Seoul Metro-City Diabetes Prevention Program (SMC-DPP). Participants underwent clinical and laboratory examinations and questionnaire survey to evaluate diabetes complications. The DR was diagnosed by grading fundus photographs 5 standard fields taken per eye. Results: The overall prevalence of any DR was 20.4% and only 6.6% of patients were aware of their DR. The DR patients who underwent an eye examination within the previous year were 42.3%, and 50.3% out of 437 patients enrolled were educated on diabetes. Of the survey participants, 83.8% answered positive to ‘Evaluation of diabetes mellitus complication must be performed every year’, 61.1% answered positive to ‘Must control blood pressure and lipid level for diabetes management’ and 28.4% believed ‘It takes a long time for complications of diabetes to develop’. The DR self awareness was 14.6% and an eye examination within the previous year was 50.6% among the 89 DR participants. Conclusions: Results of the survey with SMC-DPP type 2 diabetes participants showed a low knowledge and awareness level of chronic complications such as DR. J Korean Ophthalmol Soc 2011;52(11):1296-1301

한국 지방정부의 정책확산에 관한 연구 - 반부패 신고포상금제도를 중심으로 -

이대웅 ( Dae Woong Lee ),권기헌 ( Gi Heon Kwon ) 한국정책학회 2015 韓國政策學會報 Vol.24 No.3

본 논문의 목적은 분권적 정책체제 하에서, 사회적 문제에 대한 대응을 위한 한국 지방정부들의 정책혁신과 이의 확산 기제(mechanism)가 무엇인가에 대해 분석하는 것이다. 따라서 지방정부간 정책혁신과 정책확산의 발현이 지방정부의 합리적·주체적 의사결정에 의한 채택인지, 아니면 정치적 동기 또는 지방정부들 간의 단순 모방·경쟁 등에 의한 것인지에 대하여 분석·검토하였다. 더불어 선행연구를 보완하고자 네트워크 효과에 대한 논의와 채택되어지는 정책의 혁신 수준에 따른 각각의 확산 영향요인에 대한 비교분석을 추가적으로 실시하였다. 본 연구를 통해, 첫째, 정책확산 연구의 외부적 확산모형과 내부적 결정모형에서 나아가 네트워크 모형을 설정하여 정책확산 모형에 대한 논의의 폭을 확장시켰다. 특히 네트워크 변수들은 한국 지방정부의 정책혁신의 확산에 유의미한 영향을 미치는 것으로 나타났다. 둘째, 혁신성이 높은 정책일수록 네트워크 요인에 강하게 영향을 받는 것으로 나타났으며, 혁신성이 낮은 정책일수록 상위정부에 의한 강압적 영향을 받는 것으로 나타났다. 이를 통해 지방정부에게 정부 간 네트워크는 새롭고 혁신적인 정책에 대한 확장된 정보와 지식을 제공하고 이를 통한 정책학습 효과를 촉진시키는 것을 알 수 있다. 또한 정책의 형식적 채택이 나타나는 지방정부의 경우 상위정부의 정책 채택에 의한 강압적 영향력이 강한 것으로 나타났다. 이에 따라 지방분권체제의 본래의 취지에 적합한 정책혁신 수준의 상향을 위해서는 지방정부 자율권을 기반으로 한 네트워크를 통해 정책결정 및 채택이 지향되어야 함이 도출되었다. The research question of this study is 'what are influencing factors of diffusion at innovation policy that is newly adopted to solve social problems in local governments'. The specific research purposes of this study are the following. First, this study will find diffusion influence factors of policies. Specially, this study mainly deals with the influence of network that is a new channel of policy learning and policy emulation among local governments within the policy diffusion process. Thereby the study could construct the new model of policy diffusion network-based on trust among local governments. Second, the purpose of this study based on the hypothesis that diffusion mechanism is a different according to the policy type (on the basis of policy innovation level). So, this study will implement comparison analysis about influence factors of diffusion, depending on the degree of innovation. Third, this study will suggest policy implications for effective accomplishments of anti-corruption policy on local governments. This study's theoretical implications are as follows, first, previous studies of policy diffusion mainly consider to external effect and inter effect, but this study suggests a new model of policy diffusion that is consider to network effect. This is meaningful because of suggesting needs of consider about network as new mechanism and channel of communication and informationㆍknowledge among local governments. Second, this study will find the difference of the diffusion mechanism in accordance to policy type. Specifically, this study will find the difference of influence factors of policy diffusion in accordance to policy innovation level through empirical analysis and has implication that suggests new direction and need of policy diffusion study. This study's policy implications as follows. First, in order to achieve actual purpose of policy, local government tries to construct networks and specific cooperation on the basis of trust among local governments. That will improve the opportunities to learn and exchange knowledgeㆍinformation is an important process to adopt high-level innovation policy. Second, phenomenon of policy emulation is necessary on the local government age. But formal adoption as simply an emulation of policy will be discouraged to achieve the purposes of the policy. Therefore creative emulation through analytic learning that is considered to administrationㆍpolitic environment on local government about innovation policy must appear.

유전율에 따른 입자의 유전영동에 의한 거동에 대한 연구

이대웅(Dae Woong Lee),이상엽(Sang Youp Lee) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11

자동차 배기폐열 회수용 열전발전 시스템의 성능에 관한 연구

이대웅(Dae-Woong Lee) 대한설비공학회 2014 설비공학 논문집 Vol.26 No.6

Internal combustion engines release 30~40% of the energy from fossil fuels into the atmosphere in the form of exhaust gases. By utilizing this waste heat, plenty of energy can be conserved in the auto industry. Thermoelectric generation is one way of transforming the energy from engine’s exhaust gases into electricity in a vehicle. The thermoelectric generators located on the exhaust pipe have been developed for vehicle applications. Different experiments with thermoelectric generators have been conducted under various test conditions as following examples: hot gas temperature, hot gas mass flow rate, coolant temperature, and coolant mass flow rate. The experimental results have shown that the generated electrical power increases significantly with the temperature difference between the hot and the cold side of the thermoelectric generator and the gas flow rate of the hot-side heat exchanger. In addition, the gas temperature of the hot-side heat exchanger decreases with the length of the thermoelectric generator, especially at a low gas flow rate.

정책확산의 영향요인 분석 -사회적기업 조례제정을 중심으로-

이대웅 ( Dae Woong Lee ),권기헌 ( Gi Heon Kwon ) 한국정책학회 2014 韓國政策學會報 Vol.23 No.2

정책확산(policy diffusion) 연구는 정부가 직면하는 사회문제 해결을 위해 시도하는 정책혁신과 혁신정책의 확산 기제에 대하여 주요하게 논한다. 이에 본 연구는 정책확산의 영향요인 분석으로서 ``사회적기업 조례제정``을 중심으로 ``지방정부간 특정 정책이 일정한 기간 동안 확산되고 있다면, 이의 영향요인은 무엇인가``에 대한 질문에 답을 구하며 시작 하였다. 특별히 본 연구에서는 기존 정책확산 연구에서 상대적으로 덜 논의된 지방정부간 상호신뢰를 바탕으로 형성된 네트워크(network) 요인을 주요 변수로서 고려하였다. 분석방법은 Kaplan-Meier 분석과 사건사분석(event history analysis)방법 중 패널로짓(panel logit) 모형을 사용하였으며, 분석범위는 2009년부터 2012년까지 서울시 및 경기도 56개 지방정부로 설정하였다. Kaplan-Meier 분석결과, 사회적기업 조례의 확산이 정책확산 연구대상으로 적합한 것임을 증명하였다. 패널로짓 분석결과, 지방정부의 정책확산에 네트워크 변수로서 자매결연 네트워크 변수와 정당 네트워크 변수 모두 유의미하게 정(+)의 영향을 미치는 것으로 분석되었다. 즉, 네트워크 내 지방정부의 정책혁신은 문제해결에 있어 주요한 지식·정보의 원천이 되고 학습 및 모방효과 형성에 영향을 미치는 것으로 확인되었다. 이를 통해, 정책확산 연구에서 네트워크 요인의 중요성을 밝혔으며, 향후 지속적으로 연구를 진행하여야 할 필요성을 제시하였다는 점에서 함의가 있다고 할 수 있다. Policy diffusion studies had been mainly discussed with policy innovation and diffusion mechanism of innovation policy to solve social problems. The purpose of this study is to examine the factors of policy diffusion through 'social enterprise policy'. Especially this study considered the construction of network-based on trust among local governments as the main independent variable. Employing the data collected from 56 local governments in Seoul City and Gyeong-gi do Province from 2009 to 2012 and utilizing both kaplan-meier analysis and panel logit model, the extant study explores the influence factors of policy diffusion. The findings of the study indicate that: First, through Kaplan-Meier analysis, it is proved that 'social enterprise policy' is suitable as an object of policy diffusion study. Second, the result of the Panel Logit model provides that, a method of Event History Analysis (EHA) illustrates that both sisterhood relationship and political party variable positively influence policy diffusion. The result of the analysis suggests that policy innovation of local government in the network is not only a source of knowledge and information, but also impacts to form effects of policy learning and policy emulation. This study argues for the importance of varying influence of network in policy diffusion studies and that a continuous exploration of this field must be encouraged.

열전모듈을 이용한 자동차용 1 kW급 보조 냉난방 시스템의 성능에 관한 실험적 연구

이대웅(Dae-Woong Lee) 대한설비공학회 2014 설비공학 논문집 Vol.26 No.5

The purpose of this paper is to investigate the performance of supplemental cooling and heating system equipped with the 1 kW thermoelectric module. The system consist of 96 thermoelectric modules, heat sink with louver fin and water cooling jacket which is attached on the hot side of the thermoelectric module. The cooling and heating performance test of the thermoelectric system is conducted with various conditions, such as intake voltage, air inlet temperature, air flow volume, water inlet temperature and water flow rate at calorimeter chamber in consideration of environmental conditions in realistic vehicle drive. The experimental results of a thermoelectric system shows that the cooling capacity and COP is 1.03 kW, and 1.0, and heating capacity and COP is 1.53 kW, and 1.5 respectively.

자동차 냉각수 폐열회수 열전발전 시스템의 성능에 관한 연구

이대웅(Dae-Woong Lee) 대한설비공학회 2014 설비공학 논문집 Vol.26 No.7

This study indicated the possibility of energy regeneration from waste coolant heat, by using thermoelectric generation integrated with heat pipe. The internal combustion engine rejects more than 60% wasteful energy to the atmosphere by heat. The thermoelectric generator has recently been studied, to convert the energy from engine waste heat into electricity. For coolant waste heat recovery, a thermoelectric generator was investigated, to find out the possibility of vehicular application. Performance characteristics were conducted with various test conditions of coolant temperature, coolant mass flow rate, air temperature, and air velocity, with the thermoelectric generator installed either horizontally or vertically. Experimental results show that the electric power and conversion efficiency increases according to the temperature difference between the hot and cold side of the thermoelectric generator, and the coolant flow rate of the hot side heat exchanger. Performance improvement can be expected by optimizing the heat pipe design.

철도역 중심의 복합개발 관련 정책갈등 사례연구 : 양정역 중심 복합개발 사례를 중심으로

이대웅 ( Lee Dae Woong ),이종구 ( Lee Jong Gu ),김태진 ( Kim Tae Jin ) 한국지방행정연구원 2016 地方行政硏究 Vol.30 No.4

본 연구는 철도역 중심의 복합개발 정책에서 나타나는 갈등을 분석하여 갈등의 전개과정과 발생 원인을 도출하고 이에 근거한 제도적 해결방안을 강구하는 것을 목적으로 한다. 특히 철도역 중심의 복합개발의 경우 도시개발 사업과 관련된 입지갈등의 한 유형으로써, 일반적인 비선호시설 입지결정에 따른 갈등과는 다른 선호시설 입지결정에서 발생된 갈등이라는 차이점을 지닌다. 이에 따라 본 연구에서는 첫째, 갈등의 성격은 어떠한가(갈등 성격), 둘째, 갈등이 어떻게 전개되었는가(갈등 전개과정) 셋째, 갈등의 주체가 누구인가(갈등주체), 셋째, 갈등을 일으키는 원인은 무엇인가(갈등원인)에 대해 분석을 실시하였다. 이상의 분석 기준을 토대로 주요 이해관계자 간에 갈등이 나타나는 행태에 대해 깊이 있게 묘사하고자 하였으며, 보다 갈등이 변화하는 과정과 수준을 심층적으로 전달하며 분석하고자 하였다. 결과적으로 본 연구에서는 양정역 중심 복합개발 사례를 중심으로 논의하였으며, 갈등을 발생시키는 원인을 ① 행정적(제도적) 요인: 입지선정 및 변경절차, 주민참여와 정보공개, 사전계획에 대한 분석, ② 경제적 요인: 보상문제, ③ 정치적 요인: 지역 정치인 간의 그리고 사업 이해관계자의 적극적 소통으로 도출하였다. 나아가 이상의 분석결과를 토대로 행정적(제도적) 측면, 경제적 측면, 정치적 측면으로 정책적 함의를 제시하였다. This study is focused on analysis of policy conflicts that appear in mixed-use development of railway station area. Accordingly, this study was analyzed for the following: first, process of conflict, second, participants of conflict, third, conflict factors, fourth, conflict patterns. The results of the analysis using case study are as follows. ① institutional·administration factors: location selection and procedure of change, participation of resident and release of information, pre-analysis about development plan, ② economic factors: compensation problem, ③ political factors: communication between the local government and residents. Based on the research results, this study presents the policy implications in aspects of legal· institutional, administrative, economic, political. Also, this research aims to contribute to the policy design and solution building in the future

열전소자를 이용한 차량용 독립 냉난방시스템에 대한 실험적 연구

이대웅(Dae-Woong Lee) 대한설비공학회 2014 설비공학 논문집 Vol.26 No.8

The purpose of this paper is to investigate the cooling and heating performance of a standalone-type thermoelectric system equipped with a thermoelectric module. The system consists of a blower and two thermoelectric modules with a fin, which is soldered onto both sides of the thermoelectric module and a courtesy light. The thermoelectric system experiment is conducted with the intake voltage to find the optimum cooling and heating performance of each. The results showed that the cooling capacity and coefficient of performance (COP) were 22 W and 0.31, and the heating capacity and COP were 147 W and 1.1, respectively. In the vehicle cooling and heating performance test in a climate wind tunnel, the results showed that the standalone thermoelectric system"s cooling performance was slightly better than the base system; and the heating performance of the standalone thermoelectric system was 54.1°C and the COP was 1.3, compared to the base system.