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이현열,이건선,Lee, Hyen-Yeal,Lee, Geon-Seon 한국정보처리학회 2007 정보처리학회논문지 A Vol.14 No.4
이 논문은 셀의 두 가지 상태값(0,1)과 서로 다른 네가지 경계조건(0-0,0-1,1-0,1-1)하에서, 3근방 국소 천이함수를 갖는 유한오토마타의 천이함수를 생성하는 간단한 재귀적인 공식을 만들어, 이 공식으로 천이 함수를 몇 개의 클래스로 분류한다. This paper provides some simple recursive formulas generation transition functions of finite cellular automata with triplet local transition functions under two states (0 and 1) and four different boundary conditions (0-0,0-1,1-0,1-1), and classify transition functions into several classes.
이현열 성균관대학교 경영연구소 2022 자산운용연구 Vol.10 No.1
본 기고문은 최근 자산운용업의 가장 큰 화두인 다이렉트 인덱싱에 대하여 이야기한다. 다이렉트 인덱싱이란 기존의 인덱스를 토대로 개인의 선호를 반영한 맞춤 포트폴리오를 구성하고, 이를 운용상품이 아닌 고객들의 계좌 내에서 개별 주식 단위로 직접 운용되게 하는 기술이다. 이는 기존의 펀드나 ETF가 가지고 있던 각종 제약사항 및 단점을 보완하며, 훨씬 저렴한 비용으로 최적화된 포트폴리오 운용을 가능하게 한다. 다이렉트 인덱싱을 통해 모든 투자자는 각기 다른 포트폴리오를 가질 수 있으며 팩터에 대한 노출, 위험 통제, 개인의 선호 반영, 절세 효과 기술 등을 활용할 수 있다. 로보어드바이저와 핀테크 업체에서 출발한 다이렉트 인덱싱 서비스는 점차 생태계가 발전하고 있으며, 최근 초대형 운용사들의 인수전쟁으로 인해 더욱 주목을 받으며 운용업의 최신 트렌드로 자리잡고 있다. 각 회사들의 여러 서비스들이 준비 기간을 지나 본격적으로 출시되기 시작한 만큼 다이렉트 인덱싱은 기존 운용업을 위협할 만큼 급성장할 것으로 기대된다.
이현열,서진석,박재석 대한자기공명의과학회 2009 Investigative Magnetic Resonance Imaging Vol.13 No.2
Purpose : To compare 12 and 32-element surface coil arrays for highly accelerated coronary magnetic resonance angiography (MRA) using parallel imaging. Materials and Methods : Steady state free precession coronary MRA was performed in 5 healthy volunteers at 1.5 T whole body MR scanner using both 12 and 32-element surface coil arrays. Left anterior descending and right coronary artery data sets were acquired for each volunteer. Data sets were sub-sampled for parallel imaging using reduction factors from 1 to 6. Mean geometry factor (g-factor), maximum g-factor, and artifact level were calculated for each of the two coil arrays. Results : Over all reduction factors, the mean and maximum g-factors and artifact level were significantly reduced using the 32-element array compared to the 12-element array (P << 0.1). The mean g-factor was sensitive to the imaging orientations of coronary arteries while the maximum g-factor and artifact level were independent of orientation. Conclusion : The 32-element surface coil array significantly improves artifact and noise suppression for highly accelerated coronary MRA using parallel imaging. The increased acceleration factors made feasible with the 32-element array offer the potential to enhance spatial resolution or increase volumetric coverage for 3D coronary MRA.
이현열,이건선 한국정보처리학회 2007 정보처리학회논문지. 컴퓨터 및 통신시스템 Vol.14 No.4
This paper provides some simple recursive formulas generation transition functions of finite cellular automata with triplet local transition functions under two states (0 and 1) and four different boundary conditions (0━0,0━1,1━0,1━1), and classify transition functions into several classes. 이 논문은 셀의 두 가지 상태값(0,1)과 서로 다른 네가지 경계조건(0━0,0━1,1━0,1━1)하에서, 3근방 국소 천이함수를 갖는 유한오토마타의 천이함수를 생성하는 간단한 재귀적인 공식을 만들어, 이 공식으로 천이 함수를 몇 개의 클래스로 분류한다.
이현열 한국금융법학회 2007 金融法硏究 Vol.4 No.2
Even though in insurance business law two goals of insurance company which are financial soundness of insurance company and consumer protection were commonly understood as an opposite concepts, those could be re-consider as head and tail of a coin. Because the supervisor would take one of them according to the entire policy environment and this is well reflected in insurance business law, the relationship of these two goals within the insurance product was studied in this paper. First, as the general insurance products system including the elements of insurance product such as terms and conditions, business manuals, premium and reserve calculation manual was studied. The effect of the Financial Investment Services and Capital Markets Act to the insurance business, especially about the classification between insurance product and derivative product was researched. Second, the attribute of insurance as a group was studied. The assertion that the profit of insurance group should be superior to the profit of individual insurance consumers is not reasonable for it could be manipulated to transfer the loss of insurance company to the insurance consumers. So non-guaranteed should be executed on legal foundation. Third, on the issue of the conflict between the insurance law and the competition law regarding unfair co-practice of insurance companies, the possibility of regulation overlapping can cause the economical and social cost. So in order to reduce the cost, adequate arrangement should be taken in the sense of the uniqueness of insurance industry. In addition to this study, the method for increasing the solvency of insurance company to protect the insurance consumer s rights to give the benefit should be studied.