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Dehn surgeries on middle/hyper doubly Seifert twisted torus knots
강성모 대한수학회 2020 대한수학회보 Vol.57 No.1
In this paper, we classify all twisted torus knots which are middle/hyper doubly Seifert. By the definition of middle/hyper doubly Seifert knots, these knots admit Dehn surgery yielding either Seifert-fibered spaces or graph manifolds at a surface slope. We show that middle/hyper doubly Seifert twisted torus knots admit the latter, that is, non-Seifert-fibered graph manifolds whose decomposing pieces consist of two Seifert-fibered spaces over the disk with two exceptional fibers.
강성모,이상민,조용희,임상민,이철균 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
Oxidation stability and low temperature fluidity are important factors in the quality of biodiesel. Monounsaturated fatty acids (MUFAs) are suitable fatty acids for biodiesel when considering the cold flow property and oxidative stability in regards to the biodiesel fuel standards. In this study, MUFA productivity of Phaeodactylum tricornutum MBEyh07L (KCTC18366P), isolated from coastal seawater of Young-Heung Island, Incheon, Korea, was investigated. The biomass was produced using bubble column photobioreactors in modified f/2-Si medium prepared with natural seawater. The highest MUFA productivity obtained was 28.5 mg/L/d. MUFAs accounted for 43.1% of the total fatty acids produced whereas saturated fatty acids and polyunsaturated fatty acids accounted for 26.0% and 18.0% of the total fatty acids, respectively. The result implies that the lipids from P. tricornutum MBEyh07L may contribute to improve the oxidation stability and cold flow property of biodiesel.
부과방식(PAYG) 공적연금 도입이 출산율에 미치는 영향
강성모,위정범,성주호 한국보험학회 2022 保險學會誌 Vol.129 No.-
The paper employs an overlapping generation model to identify the effects of implementing the PAYG public pension scheme upon the fertility rate and lifetime utility. We find out that the fertility rate largely depends upon the income effect which comes from the difference between the implicit return of PAYG and the return of personal saving. This suggests that Aaron’s theorem could be widely applicable to the economy model with endogenous fertility rate and various coefficients of relative risk aversion through a utility function. As a result, implementing PAYG under the dynamically efficient economy leads to the negative effects which decrease fertility rates and individual utilities simultaneously. 우리는 중첩세대모형을 통하여 PAYG 공적연금제도의 도입이 개인의 출산율 그리고 생애효용에 주는 영향은 연금수익률과 저축수익률의 차이에 따른 소득 효과에 좌우된다는 것을 밝힐 수 있었다. 이는 Aaron의 정리를, 출산율을 내생변수로 한 모형에서 다양한 위험회피계수에 확대 적용할 수 있다는 것을 보여준 것이다. 결론적으로 동적으로 효율적인 경제에서 PAYG 공적연금 도입은 출산율뿐만 아니라 개인 생애효용까지 동시에 감소시키는 부정적 효과를 초래할 수 있다.
강성모,김용모,이관수 대한기계학회 2009 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.23 No.12
This study numerically investigates the detailed structure and NO formation in atmospheric and high-pressure leanpremixed flames. Parallel unstructured-grid finite-volume method (FVM) has been developed to maintain the geometric flexibility and computational efficiency for the solution of the physically and geometrically complex flows. In order to realistically represent the complex turbulence-chemistry interaction of high-pressure lean-premixed turbulent flames encountered in gas turbine combustors, a flamelet model based on the level-set approach has been adopted. Special emphasis is given to the effects of pressure and equivalence ratio on the flame front location and NO formation, as well as the dimensionless parameters including turbulent Reynolds number, Re, Damköhler number, Da, and Karlovitz number, Ka in the lean-premixed gas turbine-like situations. Numerical results obtained in this study suggest that the level-set approach in the context of parallel unstructured-grid FVM is capable of realistically simulating the detailed structure and NO formation in the atmospheric and high-pressure lean-premixed flames.
단어 구분 및 인식 알고리즘을 이용한 안드로이드 플랫폼 기반의 멀티 성경 애플리케이션
강성모,강명수,김종면,Kang, Sung-Mo,Kang, Myeong-Su,Kim, Jong-Myon 대한임베디드공학회 2011 대한임베디드공학회논문지 Vol.6 No.4
Mobile phones, which were used for simply calling and sending text messages, have recently moved to application-oriented digital devices such as smart phones and tablet phones. The rapid increase of smart and tablet phones which can offer advanced ability and run a variety of applications based on Java requires various digital multimedia content activities. These days, there are more than 2.2 billions of Christians around the world. Among them, more than 300 millions of people live in Asian, and all of them have and read the bible. If there is an application for the bible which translates from English to their own languages, it could be very helpful. With this reason, this paper proposes a multi-bible application that supports various languages. To do this, we implemented an algorithm that recognize sentences in the bible as word by word. The algorithm is essentially composed of the following three functions: tokenizing sentences in the bible into word by word (word tokenization), recognizing words by using touch event (word recognition), and translating the selected words to the desired language. Consequently, the proposed multi-bible application supports language translation efficiently by touching words of sentences in the bible.