• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1996년도 춘계학술대회 논문집
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• pp.299-304
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• 1996

This paper studies the rational approximation of multiple input delay systems using the Hankel singular values and vectors, which are the soultion of a transcendental equation. Rational approximatants are obtained from output normal realizations which are constructed by the Hankel singular values and vectors. Consequently, it is shown that rational approximants by output normal realization preserve intrinsic properties of time delay systems than Pade approximants.

• Bulletin of the Korean Chemical Society
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• 제5권3호
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• pp.112-117
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• 1984

The association constants (K) of 3,5,N-trimethyl pyridinium iodide in 95 volume percent ethanol-water mixed solvent were determined by a modified UV and conductance method at $25^{\circ},\;30{\circ},\;40{\circ}\;and\;50{\circ}C$ over the pressure range 1 to 2000 bars. The association process is enhanced with increasing pressure and decreasing temperature. From K values, we obtained the total partial molar volume change (${\Delta}V$) and some thermodynamic parameters. The electrostriction volume (${\Delta}V_{el}$) and intrinsic volume (${\Delta}V_{in}$) were also evaluated. The values of ${\Delta}V,\;{\Delta}V_{el},\;{\Delta}V_{in}$ are negative, negative and positive, respectively, and the absolute values of all these three decrease with increasing pressure and temperature. The ion-pair size (a) were varied 3 to 6 ${\AA}$, with pressure and temperature. The solvation number (n) decreased from 2 to 0.5 with increasing temperature.

• 한국멀티미디어학회논문지
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• 제24권9호
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• pp.1285-1298
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• 2021

Among the diverse apartment brand TV Ads, KCC Switzen uses a unique advertising strategy. Unlike their competitors, KCC Switzen uses a strategy without fancy rhetoric such as luxury, premium or high-tech to enhance the value of their housing. In order to define the value of contemporary housing this paper analyses the socio-cultural messaging of KCC Switzen's television advertisements using Qualitative content analysis and Floch's Semiotic Square of Consumption Values method. As a result of this analysis, KCC Switzen's advertisements are shown to contain both intrinsic values of housing and cultural humanism by asking ablout the daily lives of real families and their relationships with neighbors. This directly contrasts with the standard advertisements that focus on the investment value of residential housing. The unique KCC Switzen advertising strategies are expected to change the paradigm of residential housing.

• 한국의류학회지
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• 제28권2호
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• pp.200-211
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• 2004

The Purpose of this study was to review the effects of the cyberspace mentality on fashion as a visible symbol of feminity and to analyze terms of its aesthetic values. As for the research methodology, relevant theories across cultures and disciplines are reviewed and an experimental study is conducted to explore spiritual objectives in cyberspace. Then, major issues facing the digital society. symbolized in the computer networks, are reviewed in terms of feminine identity and physical beauty from a feminist＇s viewpoint. Lastly, the aesthetic values found in the spatial meditation of a new dimension (reality versus virtuality) is comparatively analyzed. The virual reality technology and bio-medical technology are combined to be represented in fashion to create a more realistic virtual world than the real one. Such a world may well be characterized by virtuality, artificiality, masquerade, and fantasy. The intrinsic values which are revealed as psychiatrical or psychological implicated values featuring virtual or artificial implications may well be characterized by distopia, hyper, hybridity and Sur Reality.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 추계종합학술대회 논문집(1)
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• pp.357-360
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• 2000

This paper describes a parameter extraction method for HBT(Heterojunction Bipolar Transistor) equivalent circuit model without measurements of special test structures or numerical optimizations. Instead, all equivalent circuit parameters are calculated analytically from small-signal S-parameters measured under different bias conditions. These values being extracted from the cutoff mode can be used to extract intrinsic parameters at the active mode. This method yields a deviation of about 1.3 % between the measured and modeled S-parameters.

• 전자공학회논문지B
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• 제29B권7호
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• pp.70-78
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• 1992

In this paper, an approach for 3-D object segmentation and classification, which is based on eigen-values of polynomial function as their surface features, using neural network is proposed. The range images of 3-D objects are classified into surface primitives which are homogeneous in their intrinsic eigenvalue properties. The misclassified regions due to noise effect are merged into correct regions satisfying homogeneous constraints of Hopfield neural network. The proposed method has advantage of processing both segmentation and classification simultaneously.

• Journal of Nutrition and Health
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• 제53권1호
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• pp.54-67
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• 2020

본 연구는 경기지역의 IT 분야 직장인 340명을 대상으로 일반적 특성, 직무스트레스 수준, 건강기능식품 선택속성 및 소비가치에 대한 설문 조사를 실시하였으며, 직무스트레스 수준에 따라 두 개의 집단으로 나누어 집단 간 일반적 특성, 건강기능식품 선택속성 및 소비가치의 차이를 알아보고, 직무스트레스와 건강기능식품 선택속성의 관계에 대한 건강기능식품 소비가치의 매개효과를 분석하였다. 연구 결과, 대상자의 건강기능식품 선택속성과 관련하여 직무스트레스 수준이 낮은 집단이 제품의 성분, 효능의 내재적 속성을 더 고려하는 것으로 나타났다. 대상자의 건강기능식품 소비가치와 관련하여 직무스트레스 수준이 낮은 집단이 건강기능식품 복용으로 건강을 지킬 수 있다는 안정감의 감정적 가치를 중요하게 여기는 반면, 직무스트레스 수준이 높을수록 다른 사람들과 차별화된 건강기능식품 선택이 중요하다는 인지적 가치를 중요하게 여기는 것으로 나타났다. 상관관계 분석 결과, 직무스트레스 수준이 높을수록 건강기능식품 선택속성 중 내재적 속성, 건강기능식품 소비가치 중 감정적 가치 및 가격, 실용성 및 안전성을 중요하게 생각하는 기능적 가치 (p = -0.134)를 고려하지 않는 것으로 나타났다. 매개효과 분석에서는 직무스트레스 수준이 내재적 속성에 직접적으로 영향을 미치는 것이 아니라 기능적 가치와 감정적 가치를 통해 영향을 미치는 완전매개효과를 나타냈다. 연구 결과를 종합해보면 직무스트레스 수준이 낮을수록 건강기능식품 선택속성 및 건강기능식품 소비가치에 긍정적인 영향을 주는 것으로 나타났으며, 직무스트레스 수준과 건강기능식품 선택속성의 관계에서 건강기능식품 소비가치 중 기능적 가치와 감정적 가치가 완전 매개효과를 가지는 것으로 나타났다. IT 분야 직장인들은 직업적 특성 상 지속적으로 스트레스 상황에 놓여 있으며 그로 인해 발생할 수 있는 신체적 이상을 예방하기 위한 건강기능식품 이용이 증가하고 있다. 따라서 올바른 건강기능식품 선택을 통해 효과적으로 건강을 유지할 수 있도록 건강기능식품 소비가치를 개선하기 위한 교육이 필요하다. 소비가치는 소비자의 사고 및 행위를 이끄는 판단기준의 집합으로, 교육 대상자들이 건강기능식품에 대하여 제품이 주는 이미지보다는 성분과 효능 및 안전성 등에 가치를 두고 관심을 가질 수 있도록 하는 교육이 이루어져야 한다.

• 한국환경과학회지
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• 제12권7호
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• pp.817-824
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• 2003

Various kinds of zeolites, such as analcime (ANA), cancrinite (CAN), Na-Pl and sodalite octahydrate (SOD) could be synthesized from Hwangto by hydrothermal reaction in a high-pressure vessel. The adsorption characteristics of Cu(II) and Cd(II) by Hwangto and its synthetic zeolites were investigated using the chemical and electrochemical surface parameters of these adsorbents. The heavy metal adsorptivity among the adsorbents decreased in the following sequences: Na-Pl > SOD > ANA > CAN > Hwangto. This sequence was the same with the values of surface site density (Ns) of these adsorbents and was correlated inversely with the values of pHpzc (pH of the point of zero charge) and the va]ues of K$\_$a2/(int) (intrinsic surface deprotonation constant) of the adsorbents for synthetic zeolites, i.e., the adsorbents with higher values of Ns and with lower values of pHpzc and K$\_$a2/(int) for synthetic zeolites showed higher heavy metal adsorptivity. With increasing pH, the heavy metal adsorptivity increased greatly between pHpzc and pH 6 or 7 because of the steep increase of negatively charged sites for synthetic zeolites, but for Hwangto, it increased broadly because of slow increase of negatively charged sites based on its lower surface sites.

• Bulletin of the Korean Chemical Society
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• 제29권6호
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• pp.1233-1242
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• 2008

The hydration effect on the intrinsic magnetism of natural salmon double-strand DNA was explored using electron magnetic resonance (EMR) spectroscopy and superconducting quantum interference device (SQUID) magnetic measurements. We learned from this study that the magnetic properties of DNA are roughly classified into two distinct groups depending on their water content: One group is of higher water content in the range of 2.6-24 water molecules per nucleotide (wpn), where all the EMR parameters and SQUID susceptibilities are dominated by spin species experiencing quasi one-dimensional diffusive motion and are independent of the water content. The other group is of lower water content in the range of 1.4-0.5 wpn. In this group, the magnetic properties are most probably dominated by cyclotron motion of spin species along the helical π -way, which is possible when the momentum scattering time (${\tau}_k$) is long enough not only to satisfy the cyclotron resonance condition (${\omega}_c{\tau}_k$ > 1) but also to induce a constructive interference between the neighboring double helices. The same effect is reflected in the S-shaped magnetization-magnetic field strength (M-H) curves superimposed with the linear background obtained by SQUID measurements, which leads to larger susceptibilities at 1000 G when compared with the values at 10,000 G. In particular, we propose that the spin-orbital coupling and Faraday's mutual inductive effect can be utilized to interpret the dimensional crossover of spin motions from quasi 1D in the hydrate state to 3D in the dry state of dsDNA.

• Korean Chemical Engineering Research
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• 제56권6호
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• pp.914-920
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• 2018

본 연구에서는 상용 니켈-알루미나 촉매를 이용한 메탄가스-수증기 개질반응에서의 고유반응속도 상수를 결정하였다. 반응메커니즘을 반영하기 위해 Langmuir-Hinshelwood chemisorption 이론에 기반한 반응속도식을 사용하였고 반응온도($630{\sim}750^{\circ}C$) 및 반응물의 분압(S/C ratio = 2.7~3.5)을 실험변수로 설정하였다. 실험을 통해 얻어진 데이터를 기반으로 효율적인 최적화 알고리즘을 이용하여 최적 고유반응속도상수들을 결정하였다. 최종적으로 제안된 이 수학적 반응 모델은 촉매반응기의 설계 및 운전조건 최적화에 활용 가능하다.