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Lee, Jehoon,Vasikaran, Samuel The Korean Society for Laboratory Medicine 2012 Annals of Laboratory Medicine Vol.32 No.2
<P>Osteoporosis is a major health problem worldwide, and is projected to increase exponentially due to the aging of the population. The absolute fracture risk in individual subjects is calculated by the use of algorithms which include bone mineral density (BMD), age, gender, history of prior fracture and other risk factors. This review describes the laboratory investigations into osteoporosis which include serum calcium, phosphate, creatinine, alkaline phosphatase and 25-hydroxyvitamin D and, additionally in men, testosterone. Parathyroid hormone (PTH) is measured in patients with abnormal serum calcium to determine its cause. Other laboratory investigations such as thyroid function testing, screening for multiple myeloma, and screening for Cushing's syndrome, are performed if indicated. Measurement of bone turnover markers (BTMs) is currently not included in algorithms for fracture risk calculations due to the lack of data. However, BTMs may be useful for monitoring osteoporosis treatment. Further studies of the reference BTMs serum carboxy terminal telopeptide of collagen type I (s-CTX) and serum procollagen type I N-terminal propeptide (s-PINP) in fracture risk prediction and in monitoring various treatments for osteoporosis may help expedite their inclusion in routine clinical practice.</P>
Employing Reinventing Government Framework to Accelerate Decentralization
Jehoon Lee 서울행정학회 2003 서울행정학회 학술대회 발표논문집 Vol.- No.-
This presentation discusses reinventing government framework and its adaptation into Korean government. Using a political economy approach. an analysis is made of the difference between Clinton-Gore's NPR experience and Korea's administration reform measures. Reinvention framework has been formulated by strategies and process to emphasize both structural and cultural changes in public sector. The NPR experiment was generally success in terms of effects of downsizing, and public trust, however. Korean reinvention efforts did not overcome inherent limits. The fact that unclearness of public-private distinction is the major factor that limited effective implementation of reforms in Korea. In addition. a major drawback of the Korean administrative reform is the lack of government partnership between national and local government. Next step for the reinvention efforts should be focused on decentralization. For the sake of decentralization, three major missions for central government should follow. to help set the direction and the expected results that local governments seek to achieve. This is a negotiation and a dialogue. between levels of government. not an imposition by the national government; (ⅱ) to hold local governments accountable for using their powers and management flexibilities to improve their performance. The national government can help create a ''performance measurement system" for local governments to monitor their efforts; (ⅲ) to provide support to local governments and to stimulate innovation by local governments.
Lee, Changmin,Choi, Sungho,An, Youngseo,An, Byeong-Seon,Lee, Woohui,Oh, Wan,Eom, Deokjoon,Lee, Jehoon,Yang, Cheol-Woong,Kim, Hyoungsub IOP 2019 Semiconductor science and technology Vol.34 No.10
<P>For sequential stacking of an Al<SUB>2</SUB>O<SUB>3</SUB> passivation layer and a main HfO<SUB>2</SUB> gate dielectric layer on In<SUB>0.53</SUB>Ga<SUB>0.47</SUB>As, we used single- and dual-temperature atomic-layer deposition processes, and systematically compared their effects on the dielectric-related electrical properties. When the deposition of Al<SUB>2</SUB>O<SUB>3</SUB> passivation layer (approximately 0.7−0.8 nm) took place at relatively low temperatures of 100 °C, an increase in the subsequent deposition temperature for HfO<SUB>2</SUB> (from 100 to 300 °C) assisted in decreasing both capacitance-equivalent oxide thickness and the number of bulk-related traps. However, the valuable reduction in both near-interface defect density and leakage current through the low-temperature Al<SUB>2</SUB>O<SUB>3</SUB> passivation approach was monotonically lessened with an increase in the process temperature for the subsequent HfO<SUB>2</SUB> deposition, which suggests the need for a careful optimization of a thermal budget for the dual-temperature process.</P>
사전 시뮬레이션과 점항법 유도를 이용한 고정익 무인기의 자동 착륙 접근
이제훈(Jehoon Lee),박상혁(Sanghyuk Park) 한국항공우주학회 2021 韓國航空宇宙學會誌 Vol.49 No.7
본 논문에서는 고정익 무인기의 점항법을 이용한 자동 착륙 접근 유도에 대해 기술한다. 본 연구의 주요 특징은 Dubin’s 모델 기반 2D 사전 시뮬레이션을 이용하여 자동 착륙 접근에 필요한 경로점을 생성하고, 또한 사전 시뮬레이션으로부터 활주로까지의 남은 시간을 예측하여 이를 고도제어에 활용한다. 설계한 알고리즘의 성능은 시뮬레이션과 비행 시험을 통해 검증한다. This paper describes an automatic landing approach algorithm for fixed-wing UAVs using waypoint guidance. The proposed algorithm utilizes simple 2D Dubin’s vehicle pre-simulations in planning the waypoints for landing approach. The remaining time to reach the runway is also estimated in the pre-simulation, and it is used for altitude control. The performance of the designed algorithm was verified by simulations and flight tests.
탄소감축 정책의 경제적 영향: 거시계량모형에 기반한 배출권가격 변동 효과 분석
이제훈 ( Jehoon Lee ),조수진 ( Soojin Jo ) 한국환경경제학회·한국자원경제학회 2024 자원·환경경제연구 Vol.33 No.1
배출권거래제는 대표적인 기후정책으로 온실가스 총배출량의 87%(2021년 기준)에 대한 감축 유인체계를 형성한다. 상당량의 감축이 기대되는 가운데 배출권가격 변동이 경제, 에너지 및 환경 부문에 미칠 파급 효과에 대한 심도있는 이해가 필요하다. 본 고는 거시계량 기반 연립방정식 모형을 통해 배출권거래제의 정책효과를 분석한 국내 최초의 연구로, 한국표준산업분류(경제), 에너지밸런스(에너지), 국가온실가스인벤토리(환경)를 연결해 현실 설명력을 제고한 데 의의를 지닌다. E3 동학에 대한 분석결과에 따르면 4년에 걸친 배출권가격의 50% 인상충격은 온실가스 배출량 감소(-0.043%)와 함께 주요 거시변수인 실질GDP(-0.058%), 민간소비(-0.003%) 및 투자(-0.301%) 등의 하방 이동으로 귀결된다. 배출권가격의 인상은 온실가스 감축목표 달성의 필수불가결한 요소로, 가격 인상 충격에 따른 이행리스크에 대응함으로써 거시 경제의 지속가능성을 담보하기 위해 경매수익을 활용한 세수환원 방안을 검토할 수 있다. 본 연구는 법인세 경감 및 경상이전지출 확대 등 세수환원 수단 중 성장 측면에서 후자의 정책 비교우위를 확인했다. The emissions trading system stands as a pivotal climate policy in Korea, incentivizing abatement equivalent to 87% of total emissions (as of 2021). As the system likely has a far-reaching impact, it is crucial to understand how the real economic activity, energy sector, as well as environment would be influenced by its implementation. Employing a macroeconometric model, this paper is the first study analyzing the effects of the Korean emissions trading policy. It interconnects the Korean Standard Industrial Classification (Economy), Energy Balance (Energy), and National Inventory Report (Environment), enhancing its real-world explanatory power. We find that a 50% increase in emission permit price over four years results in a decrease in greenhouse gas emissions (-0.043%) and downward shifts in key macroeconomic variables, including real GDP (-0.058%), private consumption (-0.003%), and investment (-0.301%). The price increase in emission permit is deemed crucial for achieving greenhouse gas reduction targets. To mitigate transition risk associated with price shocks, revenue recycling using auction could ensure the sustainability of the economy. This study confirms the comparative advantage of expanded current transfers expenditure over corporate tax reduction, particularly from an economic growth perspective.