• Title/Summary/Keyword: semi-continuous

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CONTROLLABILITY OF SECOND ORDER SEMI-LINEAR NEUTRAL IMPULSIVE DIFFERENTIAL INCLUSIONS ON UNBOUNDED DOMAIN WITH INFINITE DELAY IN BANACH SPACES

  • Chalishajar, Dimplekumar N.;Acharya, Falguni S.
    • Bulletin of the Korean Mathematical Society
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    • v.48 no.4
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    • pp.813-838
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    • 2011
  • In this paper, we prove sufficient conditions for controllability of second order semi-linear neutral impulsive differential inclusions on unbounded domain with infinite delay in Banach spaces using the theory of strongly continuous Cosine families. We shall rely on a fixed point theorem due to Ma for multi-valued maps. The controllability results in infinite dimensional space has been proved without compactness on the family of Cosine operators.

A study on the variable damping characteristics of the continuous controlled semi-active suspension system and the effect analysis of the vehicles motion performance (연속제어방식의 반능동형 전자제어 현가장치의 가변댐퍼 감쇠력 특성 연구 및 차량 운동성능에 미치는 효과 분석)

  • 소상균;조경일
    • Transactions of the Korean Society of Automotive Engineers
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    • v.7 no.8
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    • pp.190-198
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    • 1999
  • Continuously controlled semi-active suspension system may improve ride and handling properties. Here, as a mechanism to control the fluid flow solenoid valve mechanism is introduced and added to the basic passive damper to create damping forces of the shock absorbers. The system may produce continuously controlled damping forces in both solenoid valve only and combination with passive shock absorber including fluid flow is studied, and then the combined model is added to the full vehicle model to evaluate its ride and handling performance. Finally, the simulation results are compared to the vehicle models having similar suspension system.

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Second-Order Elastic Analysis and Optimum Design Considering Semi-Rigid Connection for Steel Structures (반강접 접합부를 고려한 철골 구조물의 2차 탄성 해석 및 최적설계)

  • Gu, Bon-Ryul;Park, Choon-Wook;Kang, Sung-Won;Kang, Moon-Myung
    • Journal of Korean Association for Spatial Structures
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    • v.3 no.1 s.7
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    • pp.35-46
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    • 2003
  • Conventional analysis and design of steel structures are performed using the assumption of a either fully rigid or pinned. However, every steel connection lies in between fully rigid and pinned connection. So, It is important to consider the connection for steel structure design. In this paper Computer-based second-order elastic analysis is used to calculate one story two bay and two story three bay for steel structures with semi-rigid connection. Genetic Algorithms(GAs) and Sequential Unconstrained Minized Technique(SUMT) dynamic programming is used to the method for optimum design of steel structures. The efficiency and validity of the developed continuous and discrete optimum design algorithm was verified by applying the algorithm to optimum design examples.

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A New Gerbera Cultivar "Pink Swan"; High-yielding Cultivar with Pink and Semi-double for Cut-flower

  • Park, Sang Kun;Lim, Jin Hee;Kim, Mi Seon;Joung, Hyang Young;Shin, Hak Ki;Cho, Hae Ryong;Rhee, Hye Kyung
    • Korean Journal of Breeding Science
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    • v.41 no.4
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    • pp.539-542
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    • 2009
  • A new gerbera variety "Pink Swan" was released by the National Horticultural Research Institute (NHRI) in 2007. A cross was made between "Royal" with orange and single and 'Himalaya' with white and semi-double in 2004. After investigation of the characteristics for 4 years (from 2004 to 2007), it was selected specially for the use of cut-flower. "Pink Swan" is a vigorous medium-sized cultivar with pink (RHS R48D), yellow green center and semi-double. The average flower diameter is 10.6 cm. And inner ray floret and disc diameter is 5.99cm and 1.83cm, respectively. It produces a large yield with continuous supply of flowers and has adequate peduncle height. We believe that "Pink Swan" has a great potential for expanding cultivated area of domestic gerbera cultivar and increasing farmers-income.

Two New Lichen Species, Thelopsis ullungdoensis and Phylloblastia gyeongsangbukensis from Korea

  • Halda, Josef P.;Oh, Soon-Ok;Liu, Dong;Lee, Beeyoung Gun;Kondratyuk, Sergey Y.;Lokos, Laszlo;Park, Jung-Shin;Woo, Jung-Jae;Hur, Jae-Seoun
    • Mycobiology
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    • v.48 no.6
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    • pp.443-449
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    • 2020
  • Two new species, Thelopsis ullungdoensis and Phylloblastia gyeongsangbukensis are described from Ullung-Do (Island), South Korea. The closest relatives from Europe and Korea are epiphytic Thelopsis flaveola which differs by their immersed or semi-immersed yellow ascomata, ascospores without halo and their habitat of smooth bark (mainly Fagus) in humid and cold climates. Thelopsis gangwondoensis differs by its bigger semi-immersed ascomata (600-700 ㎛ in diam.), oblong halonate ascospores (8-12 × 6-8 ㎛) and its habitat of smooth bark of deciduous trees. P. gyeongsangbukensis differs from its relatives within the genus in having 5-septate ascospores (22-26 × 6-8 ㎛), semi-immersed, subglobose ascomata with a flattened top (250-400 ㎛) and a thin, matt, uneven gray-brown to gray-green continuous thallus without isidia.

Mathematical Models on Diffusive Loss of Non-Aqueous Phase Organic Solvents from a Disk Source (디스크소스로부터 NAPL의 확산손실에 관한 수학적 모델)

  • Yoon, In-Taek;S.E., Dickson
    • Journal of Soil and Groundwater Environment
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    • v.13 no.6
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    • pp.40-49
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    • 2008
  • Matrix diffusion from planar fractures was studied mathematically and through physical model experiments. Mathematical models were developed to simulate diffusion from 2D and 3D instantaneous disk sources and a 3D continuous disk source. The models were based on analytical solutions previously developed by Carslaw and Jaeger (1959). The mathematical simulations indicated that the 2D scenario produces significantly different results from the 3D scenario, the time for mass disappearance is significantly larger for continuous sources than for instantaneous sources, the normalized concentration generally decreased over time for instantaneous sources while it increased over time for continuous sources, diffusion rates decrease significantly over time and space, and the normalized mass loss from the source zone never reaches 1 for continuous sources due to the semi-infinite integral. The simulations also showed that disappearance times increase exponentially with increasing source radii and matrix porosity, and decrease with increasing aqueous-phase NAPL solubilities.

A Study on the Korean Broadcasting Speech Recognition (한국어 방송 음성 인식에 관한 연구)

  • 김석동;송도선;이행세
    • The Journal of the Acoustical Society of Korea
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    • v.18 no.1
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    • pp.53-60
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    • 1999
  • This paper is a study on the korean broadcasting speech recognition. Here we present the methods for the large vocabuary continuous speech recognition. Our main concerns are the language modeling and the search algorithm. The used acoustic model is the uni-phone semi-continuous hidden markov model and the used linguistic model is the N-gram model. The search algorithm consist of three phases in order to utilize all available acoustic and linguistic information. First, we use the forward Viterbi beam search to find word end frames and to estimate related scores. Second, we use the backword Viterbi beam search to find word begin frames and to estimate related scores. Finally, we use A/sup */ search to combine the above two results with the N-grams language model and to get recognition results. Using these methods maximum 96.0% word recognition rate and 99.2% syllable recognition rate are achieved for the speaker-independent continuous speech recognition problem with about 12,000 vocabulary size.

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Semi-pilot Scaled Biofilter Treatment of Malodorous Waste Air Containing Hydrogen Sulfide and Ammonia: 1. Performance of Biofilter Packed with Media with Immobilized Thiobacillus sp. IW and Return-sludge (황화수소와 암모니아를 함유한 악취폐가스의 세미파일럿 규모 바이오필터 처리: 1. Thiobacillus sp. IW 및 반송슬러지를 고정한 담체를 충전한 바이오필터 운전)

  • Lee, Eun Ju;Park, Hyeri;Lim, Kwang-Hee
    • Korean Chemical Engineering Research
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    • v.51 no.5
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    • pp.568-574
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    • 2013
  • A semi-pilot biofilter packed with media with immobilized Thiobacillus sp. IW and return sludge, was operated under various operating conditions in order to treat malodorous waste air containing both hydrogen sulfide and ammonia which are major air pollutants emitted from composting factories and many publicly owned treatment works (POTW). At the incipient and middle stages of a semi-pilot biofilter operation, the hydrogen sulfide-removal efficiency behaves regardless of an inlet-load of ammonia. However, the ammonia-removal efficiency decreased as an inlet-load of hydrogen sulfide increased. Nevertheless, at the final stage of the semi-pilot biofilter operation, the ammonia-removal efficiency was not affected by the increase of hydrogen sulfide-inlet load. It is attributed to that a serious acidification of semi-pilot biofilter-media did not occur due to continuous injection of buffer solution at the final stage of the semi-pilot biofilter operation. When both hydrogen sulfide and ammonia contained in malodorous waste air were treated simultaneously by semi-pilot biofilter, the maximum elimination capacities of hydrogen sulfide and ammonia turned out to be ca. 58 and $30g/m^3/h$, respectively. These maximum elimination capacities were estimated to be ca. 39 and 46% less than those for lab-scaled biofilter-separate elimination of hydrogen sulfide and ammonia, respectively. Thus, for the simultaneous biofilter-treatment of hydrogen sulfide and ammonia, the maximum elimination capacity of ammonia decreased by 7% more than that of hydrogen sulfide.

ON M-CONTINUITY

  • Min, Won Keun;Chang, Hong Soon
    • Korean Journal of Mathematics
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    • v.6 no.2
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    • pp.323-329
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    • 1998
  • In this paper, we introduce a new class of sets, called $m$-sets, and the notion of $m$-continuity. In particular, $m$-sets and $m$-continuity are used to extend known results for ${\alpha}$-continuity and semi-continuity and precontinuity.

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