• 산업기술연구
• /
• 제20권A호
• /
• pp.39-44
• /
• 2000

Highly viscous biopolymer from alkali-tolerant Bacillus sp. was purified and its solution properties were investigated. The intrinsic viscosities for crude biopolymer and biopolymers purified by dialysis or CPC(cetylpyridinium chloride) treatment were 58.24, 73.60 and 42.18 dL/g, respectively. The intrinsic viscosity of biopolymer showed the maximum value at the neutral pH but it was decreased remarkably at the alkaline or acidic pH. Biopolymer exhibited the property of polyelectrolyte, showing the sharp decrease of intrinsic viscosity by the addition of NaCl. Intrinsic viscosity of dilute solution at the low NaCl concentration was exponentially dependent on temperature and its temperature dependency was increased with NaCl concentrations. The chain stiffness, coil overlap parameter, and critical concentration were 0.09, 5.25 and 0.07g/dL, respectively. Temperature dependency on intrinsic viscosity of biopolymer solution was different each other at $45^{\circ}C$. Flow activation energies at temperatures above $45^{\circ}C$ were constant, while those at temperatures below $45^{\circ}C$ increased with increase of added NaCl concentration.

• Progress in Superconductivity
• /
• 제4권2호
• /
• pp.104-108
• /
• 2003

We have measured the transport properties of $Bi_2$$Sr_2$$CaCu_2$$O_{8+d}$ (BSCCO) intrinsic Josephson junction mesa. Transport measurements with current flow along the c-axis, perpendicular to the layer of mesa showed multi-branch structures on the current-voltage characteristics. For single intrinsic junctions, the microwave radiation appears in the form of three different modes of oscillations, which include Josephson emission, nonequilibrium broad emission and sharp coherent microwave emission. Mutual phase interactions between two-mesas structures of BSCCO intrinsic Josephson junctions were studied. The results were explained within the framework of the Josephson plasma excitation model due to quasiparticle injection.n.

• 한국콘텐츠학회논문지
• /
• 제13권6호
• /
• pp.67-76
• /
• 2013

본 연구의 목적은 내재적 동기 이론과 플로우 이론의 통합을 통해 비디오 게임 이용자들이 가진 동기와 행위 간의 관계를 설명하는 이론적 모델을 제시함에 있다. 이를 위해 본 연구는 기술과 도전의 최적균형, 플로우를 통한 즐거움, 내재적 동기, 그리고 비디오 게임 장르 이용행위라는 변수들을 제시하고 이들 간의 인과적 관계성들을 조사하였다. 경로분석을 통해 변수들 간의 관계성을 검증한 결과, 내재적 동기는 최적균형과 즐거움의 경험에 의해 직접적, 간접적 영향을 받는 것으로 나타났으며, 이 내재적 동기는 신체게임과 공상게임 장르의 이용행위를 유의미하게 예측하는 것으로 나타났다. 하지만 전통게임 장르의 경우 내재적 동기와 유의미한 관계성을 나타내지 못했다. 또한 본 연구는 남성과 여성 비디오 게임 이용자들 간에 내재적 동기의 강도는 다르나, 내재적 동기가 게임 장르 이용행위를 유도하는 근본적인 관계들은 남녀 간에 상이하지 않음을 발견하였다.

• 한국초전도학회:학술대회논문집
• /
• 한국초전도학회 1999년도 High Temperature Superconductivity Vol.IX
• /
• pp.178-184
• /
• 1999

We have measured I-V characteristics of Bi$_2Sr_2CaCu_2O_{8+{\delta}}$ mesa containing a small number of intrinsic stacked Josephson junctions in a magnetic field. We fabricated mesa with an area of 40${\times}$40 ${\mu}$m$^2$ containing 3${\sim}$20 intrinsic junctions. We applied magnetic field perpendicular to He CuO$_2$ planes up to 5T. We observed flux-flow branches and flux-flow steps in the I-V characteristics which might be due to collective motion of Josephson vortices in the long junction limit. In a parallel field, critical current I$_c$ varies as I$_c$(B) ${\sim}$ exp(-B/B$_0$), where B$_0$ is about 2T, which is consistent with the theoretical model. DC and AC intrinsic Josephson effects are also discussed.

• 한국식품조리과학회지
• /
• 제8권1호
• /
• pp.57-63
• /
• 1992

The purpose of this study was to investigate the rheological and thermal properties of yam starch. Yam starch had a hydrodynamic volume with the intrinsic viscosity,［$\eta$］, of 0.29dl/g deionized water. The values of the intrinsic viscosity of yam starch, determined to pH 2-11, varied between 0.07 to 0.18 dl/g. The highest intrinsic viscosity was obtained at pH 7. At salt concentrations 0-0.2 M NaCl, the intrinsic viscosity of yam starch was decreased up to 0.05 M NaCl concentration then increased to 0.07 M NaCl concentration and remained constant to reach 0.2 M NaCl concentration. The overlap parameter, calculated with the intrinsic vicosity data, was 3.45 g/dl in deionized water. The thermal properties of yam starch were investigated by Differential Scanning Calorimetry. Three endotherms were observed both pH solution and salt concentation. In the presence of pH 9, the onset temperature of gelatinization peak was the lowest temperature of 50.$32^{\circ}C$ and the enthalpy ($\Delta$H) was increased in this solution. The effect of salt on the thermal properties of yam starch was determined at salt concetration of 0-0.2 M NaCl. The enthalpy significantly decreased to salt concentration 0.07 M NaCl and the lowest onset temperature of this concentration was 52.$90^{\circ}C$.

• Progress in Superconductivity
• /
• 제1권2호
• /
• pp.110-114
• /
• 2000

We have investigated the Josephson vortex dynamics in $Bi_2Sr_2CaCu_2O{8+\delta}$ intrinsic Josephson junctions subjected to a magnetic field parallel to $CuO_2$ planes. We investigated mesas with $40\times40{\mu}m^2$ in size and containing 6 and 20. intrinsic junctions. The zero field I-V characteristics exhibited a typical hysteretic, multi-branched nature of the intrinsic Josephson effect. At high magnetic fields (H>1.5 T), I-V characteristics showed flux flow steps. The Swihart velocity obtained from this observation was about $4.2\times10^5$ m/s, which was the lowest mode electromagnetic wave velocity of N coupled stack. The experimental I-V curves fitted well into the simple model of Cherenkov radiation including Ohmic and non-linear dissipation terms. This suggests that the dissipation mechanism of Josephson vortex be due to both Cherenkov radiation and quasiparticle tunneling current.

• 한국의류학회지
• /
• 제30권5호
• /
• pp.818-828
• /
• 2006

The purpose of this study was to clarify differences in the product attribute evaluation in relation to the objective knowledge, subjective knowledge and involvement of apparel. The measurement instruments were developed by researcher on the basis of previous studies in the same field. The subjects of this study were female adults who lived in Seoul, Kyunggi or Incheon areas and quota sampling using age and residential areas was employed. The data were obtained from 603 questionnaires. Data were statistically analyzed using SPSS 10 and LISREL 7.0. Major statistical methods were factor analysis, Cronbach's a coefficient, multiple regression analysis, and structural equation model analysis. The results were as follows: 1. Involvement was related to the consumer knowledge and the knowledge influenced evaluation of intrinsic attributes, social attributes, and economic attributes. 2. The dimensions of objective knowledge significantly influenced intrinsic attributes and economic attributes. The dimensions of subjective knowledge significantly influenced intrinsic attributes, social attributes and economic attributes. 3. Apparel involvement significantly influenced intrinsic attributes, social attributes and economic attributes. Consumers who have higher interest in apparel product but not in trends considered intrinsic attributes more importantly, whereas consumers who care trends considered social attribute more.

• 디지털융복합연구
• /
• 제9권4호
• /
• pp.157-168
• /
• 2011

본 연구에서는 조직 구성원의 내재적 동기부여가 직무만족과 직무몰입에 어떠한 영향을 미치는지 파악하고, 또한 내재적 동기부여와 직무태도 변수인 직무만족, 직무몰입의 관계에서 조직공정성의 조절효과를 실증 검증하고자 하였다. 연구결과는 다음과 같다. 첫째, 내재적 동기부여는 직무만족과 직무몰입에 정의 영향을 미치는 것으로 나타났고, 둘째, 조직공정성의 조절효과는 내재적 동기부여와 직무만족간의 관계에서는 분배공정성의 조절효과가 나타났으며 내재적 동기부여와 직무몰입간의 관계에서는 절차공정성의 조절효과가 나타났다.

• Asia pacific journal of information systems
• /
• 제15권3호
• /
• pp.91-109
• /
• 2005

According to traditional theories of information systems, one of the reasons for using information technology is that users believe it to be helpful or useful for what they want to do, which is called extrinsic motivation. However, in addition to extrinsic motivation, there are other reasons for using it such as enjoying or playing with information technology itself, called intrinsic motivation, and just others around users, called social influence. The objective of this study is to provide a research model for using information technology considering intrinsic and extrinsic motivation, and social influence. For validation of this model, we survey the users of 'Minihompy' since it is one of the most popular blog services in Korea and there are relatively clear extrinsic and intrinsic motivation, and social influence respectively in using it. By analysing 549 valid samples by Partial Least Square(PLS), we show the suggested research model to be a valid one. That is, all hypotheses we suggested turn out to be statistically significant and $R^2$ of the dependent variable, the intention of use, explaining by the model to be higher than 40%. In addition to validation of the research model, it is found that intrinsic motivation may be more important than extrinsic motivation and social influence in using information technology.

• 지식경영연구
• /
• 제14권2호
• /
• pp.89-116
• /
• 2013

The purpose of this research was to investigate relations among empowering leadership, knowledge sharing, intrinsic motivation and trust on supervisors. In addition, the purpose of this study was to investigate if trust on supervisors would mediate the effect of empowering leadership on outcome variables. A research model and hypotheses were developed to examine the theoretical research questions. To test the model proposed, survey data from 44 companies in various industries were collected by distributing 510 questionnaires to team member. The final set of data utilized to test hypotheses included 470 responses. The empirical results of the analysis are as follow. Empowering leadership was shown to influence followers' knowledge sharing. Meantime, empowering leadership was influencing intrinsic motivation and it was positively related to followers' trust on their supervisors. Finally, trust on supervisors partially mediated between empowering leadership and outcome variables. We found that empowering leadership was an important factor in a way that it closely related to variables of organizational competency, such as knowledge sharing, intrinsic motivation and trust in organization.