• Asia pacific journal of information systems
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• 제29권3호
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• pp.489-502
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• 2019

The WeChat mini program is an application embedded in WeChat that users can use without downloading and installing. After it was officially released in 2017, many travel enterprises have launched their own mini programs on the WeChat platform. This study applies affordance theory to investigate the WeChat mini program's role in tourism activities through social network analysis using the R programming language. The authors searched the topic of "how do you perceive the travel-related WeChat mini program" and then crawled the 200 comments found; 180 comments were analyzed after data cleansing. The results show that travel-related WeChat mini programs play a very important role in Chinese social network tourism activities. This paper found that WeChat played a more active role in various tourism-related interactions with Chinese social networks. Moreover, the results show how affordance theory is applied to the use of WeChat mini programs.

• 경영과정보연구
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• 제37권1호
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• pp.139-154
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• 2018

R 프로그래밍 시스템은 인터넷을 통해 개방적이고 무료로 제공이 된다. R 환경은 헌신적이고 독자적인 사용자 그룹이 제공하는 다양한 함수가 포함되는 라이브러리에 의해 그 기능이 지속적으로 풍부해지고 다양해지고 있다. R의 사용은 조직에서의 빅데이터 분석이 점차 도입되면서 다양한 데이터 형태의 데이터 조작과 데이터 분석처리가 요구되면서 점차 채택되기 시작하였다. 그러나 R 수용에 대한 연구는 아직까지 존재하지 않고 있다. 본 연구는 교육환경의 사용자가 R을 수용하는데 미치는 인지변수를 식별하고, 그들간의 관계를 규명하고자 한다. 기존의 기술수용모형에 주관적 규범과 소프트웨어 역량을 추가한 확장된 R 수용모델을 제안하고, 경로분석을 통하여 가설을 검정하였다. 사용의도에 정의 영향을 미치는 변수는 주관적 규범, 지각된 편리성, 지각된 유용성으로 밝혀졌고, 지각된 유용성은 주관적 규범, 소프트웨어 역량, 그리고 지각된 편리성으로부터 영향을 받는 것으로 나타났다. 본 연구가 이전 연구와의 주요 차이점은 대상 시스템이 독립적인 시스템이 아니고, 또한 시스템은 정적이고 개발이 확정된 상태가 아닌 진화하고 오픈소스 시스템을 대상으로 했다는 것이다. 또한 R 환경은 플랫폼으로서, 다양한 통계분석, 빅데이터분석, 그리고 시각화가 가능한 시스템이다. 우리는 TAM(Technology Acceptance Model)을 적용하여 R플랫폼에 대한 사용자의 수용에 영향을 주는 변수를 식별하고 인과관계를 처음으로 시도하였다. 또 다른 기여도는 기존의 TAM모형에 주관적 규범과 소프트웨어 역량 개념을 추가한 확장된 모형을 식별한 것이다. 본 연구결과는 통계나 빅데이터 분석 패키지 도입 계획이 있는 대학이나 기업체에 시사점을 제공할 수 있을 것이다. 그러나 분석에 사용된 표본의 수가 적고, 표본이 모집단을 대표할 수 있다는 근거가 약해 제안된 모델의 신뢰성 및 타당성이 상대적으로 미흡하다고 할 수 있을 것이다. 따라서, 향후 연구에서는 확정적 연구를 위해서는 이와 같은 문제점에 대한 보완이 필요하다고 판단된다.

• 전기전자학회논문지
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• 제26권2호
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• pp.329-332
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• 2022

본 논문에서는 ferroelectric(HfO₂)구조가 적용된 3D NAND flash memory의 parameter에 따른 lateral charge migration의 retention과 V_th를 분석하였다. P_s가 클수록 Program 시 ferroelectric에서 가능한 최대 polarization이 크기 때문에 초기 V_th는 P_s 25µC/cm² 보다 P_s 70µC/cm²에서 약 1.04V차이로 커진다. 또한 Program 이후 trap된 전자는 시간이 지남에 따라서 lateral charge migration이 발생한다. Program 이후 gate에 전압을 가하지 않고 ferroelectric은 polarization을 유지하기 때문에 P_s와 크게 관계없이 P_r이 클수록 polarization이 커지고 lateral charge migration에 의한 ∆V_th는 P_r 5µC/cm² 보다 P_r 50µC/cm²에서 약 1.54V차이로 작아진다.

• Bulletin of the Korean Chemical Society
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• 제27권3호
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• pp.413-418
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• 2006

Sodium hyaluronate (NaHA), water soluble polymer having ultra-high molecular weight, is characterized by using on-line frit inlet asymmetrical flow field-flow fractionation (FI-AFlFFF) and multiangle light scattering (MALS). This study demonstrates the capability of power programming FI-AFlFFF for the separation of NaHA and the applicability of FI-AFlFFF with MALS for the characterization of molecular weight distribution and their structural information. Since sample injection and relaxation in FI-AFlFFF are achieved by using hydrodynamic relaxation, separation of high molecular weight polymers can be achieved smoothly without halting the separation flow. Experiments are carried out with the two different NaHA products (a raw NaHA sample and a thermally degraded NaHA product) and molecular weight distribution and conformations in solution are determined. Influence of sample filtration on the change of molecular weight distribution is also discussed.

• Industrial Engineering and Management Systems
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• 제16권1호
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• pp.141-153
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• 2017

A binary integer programming model is proposed for a complex timetabling problem in a university faculty which conducts various degree programs. The decision variables are defined with fewer dimensions to economize the model size of large scale problems and to improve modeling efficiency. Binary matrices are used to incorporate the relationships between the courses and students, and the courses and teachers. The model includes generally applicable constraints such as completeness, uniqueness, and consecutiveness; and case specific constraints. The model was coded and solved using Open Solver which is an open-source optimizer available as an Excel add-in. The results indicate that complicated timetabling problems with large numbers of courses and student groups can be formulated more efficiently with fewer numbers of variables and constraints using the proposed modeling framework. The model could effectively generate timetables with a significantly lower number of work hours per week compared to currently used timetables. The model results indicate that the particular timetabling problem is bounded by the student overlaps, and both human and physical resource constraints are insignificant.

• Management Science and Financial Engineering
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• 제7권1호
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• pp.41-56
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• 2001

This linear fractional - quadratic bilevel programming problem, in which the leader's objective function is a linear fractional function and the follower's objective function is a quadratic function, is studied in this paper. The leader's and the follower's variables are related by linear constraints. The derivations of the optimality conditions are based on Kuhn-Tucker conditions and the duality theory. It is also shown that the original linear fractional - quadratic bilevel programming problem can be solved by solving a standard linear fractional program and the optimal solution of the original problem can be achieved at one of the extreme point of a convex polyhedral formed by the new feasible region. The algorithm is illustrated with the help of an example.

• 한국경영과학회지
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• 제6권1호
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• pp.65-70
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• 1981

L.G. Khachiyan's algorithm for solving a system of strict (or open) linear inequalities with integral coefficients is described. This algorithm is based on the construction of a sequence of ellipsoids in R$^n$ of decreasing n-dimensional volume and contain-ing feasible region. The running time of the algorithm is polynomial in the number of bits of computer core memory required to store the coefficients. It can be applied to solve linear programming problems in polynomially bounded time by the duality theorem of the linear programming problem. But it is difficult to use in solving practical problems. Because it requires the computation of a square roots, besides other arithmatic operations, it is impossible to do these computations exactly with absolute precision.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1999년도 봄 학술발표회 논문집(I)
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• pp.245-250
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• 1999

In this study, the development of graphic user interface(GUI) program for optimum design of RC continuous beam is dealt. Optimum design problem that satisfies strength, serviceability, durability and geometrical conditions is formulated as a non-linear programming problem(NLP) in which the objective function as well as the constraints are highly non-linear on design variables such as cross sectional dimensions and steel ratio. Optimum design problem is solved by NLP techniques namely, sequential linear programming(SLP), sequential convex programming(SCP). Numerical examples of R.C. continuous beam using GUI system are given to show usefulness of GUI system for practical design work and efficiency of algorithm for the NLP techniques.

• 대한전자공학회논문지
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• 제11권2호
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• pp.1-4
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• 1974

큰 규모의 계통이나 회로망의 해석익 있어서 0이 대부분 포함되어 있는 행렬을 반전하여 해를 구하는 것은 대단히 비능룰적이다. 이러한 계통을 Sparse행렬을 이용하여 풀면 계산시간이 적게 들고 기억용량이 감소되며 둥근(round-off)오차를 줄일 수 있다. 본논문은 Sparse 행렬를 이용하여 회로망을 푸는 방법고ㅘ 전산 프로그래밍을 제공한다.

• Computers and Concrete
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• 제30권6호
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• pp.377-391
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• 2022

The use of carbon fiber-reinforced polymers (CFRP) has widely increased due to its enhancement in the ultimate strength and ductility of the reinforced concrete (RC) structures. This study presents a prediction model for the axial compressive strength and strain of normal-strength concrete cylinders confined with CFRP. Besides, soft computing approaches have been extensively used to model in many areas of civil engineering applications. Therefore, the genetic expression programming (GEP) models to predict axial compressive strength and strain of CFRP-confined concrete specimens were used in this study. For this purpose, the parameters of 283 CFRP-confined concrete specimens collected from 38 experimental studies in the literature were taken into account as input variables to predict GEP based models. Then, the results of GEP models were statistically compared with those of models proposed by various researchers. The values of R² for strength and strain of CFRP-confined concrete were obtained as 0.897 and 0.713, respectively. The results of the comparison reveal that the proposed GEP-based models for CFRP-confined concrete have the best efficiency among the existing models and provide the best performance.