• Title/Summary/Keyword: 비대칭 구성

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A New Band-Pass Filter with Symmetrical Attenuation Characteristics (대칭적인 감쇠 특성을 갖는 대역 통과 여파기)

  • Bae, Ju-Seok;Lim, Jong-Sik;Kim, Kwi-Soo;Ahn, Dal
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.19 no.8
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    • pp.884-890
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    • 2008
  • In this paper, Characteristics responded to frequency of a band-pass filter with admittance inverters(J-inverters) is considered. As a result, it is confirmed that attenuation characteristics of upper and lower frequency is asymmetric. And a modified circuit and design formulas are proposed to improve the asymmetric attenuation characteristics. By confirming the simulated and measured results that are got from designed and made a experiment on the band-pass filter with the proposed circuit and formulas for design, we confirm that the asymmetric attenuation characteristics of the band-pass filter are improved without any optimization or iterative design procedures and additional calculation efforts.

Discrete Optimization of Unsymmetric Composite Laminates Using Linear Aproximation Method (선형 근사화방법을 이용한 비대칭 복합 적층평판의 이산최적화)

  • 이상근;구봉근;한상훈
    • Computational Structural Engineering
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    • v.10 no.2
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    • pp.255-263
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    • 1997
  • The optimum design of most structural systems used in practice requires considering design variables as discrete quantities. The present paper shows that the linear approximation method is very effective as a tool for the discrete optimum designs of unsymmetric composite laminates. The formulated design problem is subjected to a multiple in-plane loading condition due to shear and axial forces, bending and twisting moments, which is controlled by maximum strain criterion for each of the plys of a composite laminate. As an initial approach, the process of continuous variable optimization by FDM is required only once in operating discrete optimization. The nonlinear discrete optimization problem that has the discrete and continuous variables is transformed into the mixed integer programming problem by SLDP. In numerical examples, the discrete optimum solutions for the unsymmetric composite laminates consisted of six plys according to rotated stacking sequence were found, and then compared the results with the nonlinear branch and bound method to verify the efficiency of present method.

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Design and Implementation of Active Diplexer Using Asymmetrical Coupled Microstrip Lines (비대칭 결합 마이크로스트립 선로를 이용한 능동 다이플렉서의 구현)

  • 윤현보;문승찬;최원영
    • The Proceeding of the Korean Institute of Electromagnetic Engineering and Science
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    • v.4 no.3
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    • pp.11-17
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    • 1993
  • An active diplexer can be realized by using a MESFET and 2-sections of asymmetrical coupled bandpass filter, where the admittance inverter parameters in equivalent circuit of asym- metrical coupled microstrip lines are given as a function of an fundamental design parameter of a bandpass filter. An experimental active diplexer was designed over 22 and 18 percent bandwidth centered at 9 GHz and 11 GHz respectively, and the design data was optimized by Super-Compact. The gain performance was $6.2\pm0.3$dB in each band of 8.3~9.6 GHz and 10.3~11.8 GHz The measured bandwidth of the active diplexer was closely matched to design data but measured gain was slightly lower (1.5 dB) than the designed value.

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A Study on the Analytical Method for Fire Resistance Calculation of Asymmetric Slimfloor Beam (비대칭 슬림플로어 합성보의 내화성능 산정에 관한 해석적 방법 연구)

  • Park, Soo-Young;Park, Won-Sup;Kim, Heung-Youl;Hong, Gap-Pyo
    • Fire Science and Engineering
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    • v.24 no.2
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    • pp.31-37
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    • 2010
  • Asymmetric Slimfloor Beam (ASB) is a composite beam developed in Europe whose asymmetric H beam is partially inserted in concrete slab. Recently in Korea, Asymmetric Slimfloor Beam has been studied in order to save the story height of a building, reduce the amount of construction materials and increase the fire resistance of a building. On this study, the fire resistance of Asymmetric Slimfloor Beam was checked by a fire test and moment capacity was calculated at fire resistance time by a heat-transfer analysis. Using the analysis result, 3-hour fire resistance constructions consisted of fireproof gypsum boards and ASB were selected and fire resistances of selected constructions were checked.

Cure Behavior of a DGEBF Epoxy using Asymmetric Cycloaliphatic Amine Curing Agent (비대칭 고리형 지방족 아민 경화제를 이용한 DGEBF 계열 에폭시의 경화 거동)

  • Kim, Hongkyeong
    • Korean Chemical Engineering Research
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    • v.46 no.1
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    • pp.200-204
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    • 2008
  • The curing kinetics of diglycidyl ether of bisphenol F (DGEBF) with an asymmetric cycloaliphatic amine curing agent were examined by thermal analysis in both isothermal and dynamic curing conditions. From the residual curing of the samples partially cured in isothermal condition and from the dynamic curing with various heating rates, it was found that there exist two kinds of reactions such as at low temperature and at high temperature regions. It was thus also found that the cure parameters obtained from the isothermal curing kinetic model hardly estimate experimental results for a degree of cure larger than 0.6. The activation energies and frequency factors of these two kinds of reactions were obtained from the dynamic curing experiments with various heating rates. From the curing analysis, it was verified that the total cure kinetics for low degrees of cure is dominated by the cure reaction in the low temperature region.

Treatment of patients with midline discrepancies using three-piece basal archwire (Three-piece basal archwire를 이용한 치열 정중선 불일치의 교정치료)

  • Kim, Seok-Jun;Son, Woo-Sung
    • The korean journal of orthodontics
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    • v.30 no.4 s.81
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    • pp.377-386
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    • 2000
  • At the finishing stage, the use of asymmetric elastics to treat mild skeletal and dental midline discrepancies often creates several side effects such as canted occlusal plane, tipped incisors and unesthetic results. This report presents the clinical cases with midline discrepancies, following a differential diagnosis, optimal mechanics, and considerations in treatment. Differential diagnosis and treatment mechanics with three-piece basal archwire can obtain predictable midline correction with minimal side effects.

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A Study for Asymmetric Trust between Marketing Channel Members (유통경로 상에서 경로구성원 쌍방의 비대칭 신뢰에 관한 연구)

  • 함도훈;이수동;김주영;김구성
    • Journal of Distribution Research
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    • v.9 no.3
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    • pp.69-96
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    • 2004
  • This study is based upon the assumption that trust is a pedestal of much importance in the relationship behavior marketing channel members conduct in their arena. Unlike the existing studies that consider trust to be a circular simple concept with the emphasis on mutually symmetrical relationship level, this study focuses on the asymmetrically different levels of asymmetric trust concept. The major results of this study are as follows: First, among the individual characteristics which could affect on trust, reputation plays a significant role in transaction. Second, in the domain of the relation between trust and relationship characteristics, opportunistic behavior is shown to influence upon trust. Communication is turn out not to be a significant factor in trust; in a further analysis, it is also shown to influence upon willingness to make future relationship behavior. Third, willingness to make future relationship behavior plays a significant influence on trust, which shows that trust is the very core factor in the long-term relationship behavior. We can find that the antecedent factors influencing upon the trust build-up are different between agents and buyers and the established trust influences upon the future relationship behavior. This study tries to show how trust is established and what role the trust conducts.

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Comparison of Hydrolysis from In Vitro Digestion Using Symmetric and Asymmetric Triacylglycerol Compounds by Enzymatic Interesterification (효소적으로 합성된 대칭형과 비대칭형 Triacylglycerol 혼합물의 In Vitro Digestion에서의 소화율 비교)

  • Woo, Jeong Min;Lee, Ki Teak
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.43 no.6
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    • pp.842-853
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    • 2014
  • For developing indigestible lipids, symmetric triacylglycerol (ST) and asymmetric triacylglycerol (AT) were produced by enzymatic interesterification using high oleic sunflower oil, palmitic ethyl ester, and stearic ethyl ester in a shaking water bath. Used enzymes were Lipozyme RMIM for ST and Lipozyme TLIM for AT. To remove ethyl ester from reactants, methanol fractionation (reactant : methanol=1:5, w/v, $25^{\circ}C$) and florisil separation (reactant : florisil=1:8, w/w) were applied. Acetone fractionation (reactant : acetone=1:9, w/v) was implemented to separate triacylglcerol (TAG) species into ST and AT. Fractions I (before fractionation), II (after fractionation, liquid phase) and III (after fractionation, solid phase) were separated from ST, whereas fractions IV (after 1st fractionation, liquid phase) and V (after 2nd fractionation, solid phase) were from AT. From sn-2 fatty acid composition analysis, the sum of palmitic acid (C16:0) and stearic acid (C18:0) was 4.9~6.5 area% in ST (I, II, III), and 41.9~43.9 area% in AT (IV, V). In vitro digestion was performed for 0, 15, 30, 60, and 120 minutes at $37^{\circ}C$ in a shaking water bath. For the digestion results, hydrolysis of V was only 40% compared to others (I, II, III, IV) at 120 minutes due to its melting point ($49^{\circ}C$). However, initially (15 minutes), hydrolysis (%) was as follows: V$32.5^{\circ}C$, $31.8^{\circ}C$) and different slip melting points ($31.3^{\circ}C$, $19.5^{\circ}C$). Even though IV has a lower TAG content composed of two saturated fatty acids than III, it had a similar melting point.

Determination of Flow Direction from Flow Indicators in the Muposan Tuff, Southern and Eastern Cheongsong, Korea (청송 남.동부 무포산응회암의 흐름 지시자로부터 유향 결정)

  • Ahn, Ung-San;Hwan, Sang-Koo
    • Economic and Environmental Geology
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    • v.40 no.3 s.184
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    • pp.319-330
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    • 2007
  • The Muposan Tuff is a stratigraphic unit which is distinguished as a cooling unit in the volcanic rocks of the northeastern Kyeongsang Basin. The Muposan Tuff commonly belongs to tuff field according to the granulometric classification and to vitric tuffs according to the constituent classification. The tuffs are mostly densely to partially welded to include very flattened and sometimes stretched pumices and shards, and involve several flow indicator and lateral gradings in maximum diameter and content of their constituents. Movement pattern from flow lineation, lithic and pumice imbrications, asymmetric flow folds, and lateral gradings in maximum diameter and content of their constituents indicate that the Muposan Tuff had a source from the southeastern part.