• Journal of Electrical Engineering and Technology
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• 제10권1호
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• pp.18-29
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• 2015

State Estimation (SE) is the basis of a variety of advanced applications used in most modern power systems. An SE problem formed with enough phasor measurement units (PMUs) data is simply a linear weighted least squares problem requiring no iterations. Thus, designing a minimum-cost placement of PMUs that guarantees observability of a power system becomes a worthy challenge. This paper proposes an equivalent integer linear programming method for substation-oriented optimal PMU placement (SOOPP). The proposed method uses an exhaustive search to determine a globally optimal solution representing the best PMU placement for that particular power system. To obtain a more comprehensive model, contingencies and the limitation of the number of PMU measurement channels are considered and embodied in the model as changes to the original constraints and as additional constraints. The proposed method is examined for applicability using the IEEE 14-bus, 118-bus and 300-bus test systems. The comparison between SOOPP results and results obtained by other methods reveals the excellence of SOOPP. Furthermore, practical large-scale power systems are also successfully analyzed using SOOPP.

• International Journal of Aeronautical and Space Sciences
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• 제14권3호
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• pp.264-271
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• 2013

A method of multiple transport-aircraft mission modeling is proposed in order to improve the efficiency of evaluating and optimizing pre-mission plans. To deal with the challenge of multiple transport-aircraft missions, the object-oriented modeling method is utilized. The elements of the mission are decomposed into objects and businesses, And the major mission objects and their important properties are summarized. A complex mission can be broken down into basic business modules such as the ground section and flight section. The business models of loading and fueling services in the ground section are described. The business model of the flight section is composed of an air route and flight profile with the flight equation and the fuel consumption model. The logical relationship of objects and business modules is introduced. The architecture of the simulation system, which includes a database, computation module, graphical user interface (GUI) module, and a result analysis module, is established. A sample case that includes two different plans is provided to verify the model's ability to achieve multi-aircraft composite mission simulation.

• 한국컴퓨터정보학회논문지
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• 제15권12호
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• pp.143-150
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• 2010

신속히 변하는 비즈니스환경에서 기업이 살아남기 위해서는 변화하는 환경에 자사의 비즈니스 프로세스를 적응시켜야 한다. 시스템 통합은 이러한 문제를 해결하는 중요한 문제이다. 유연한 비즈니스 프로세스와 통합을 지원하는 IT 표준으로 SOA의 채택은 피할 수 없는 방향이다. 특히 비즈니스 프로세스와 인터페이스의 통합은 점차 중요도가 증대되고 있다. 따라서 비즈니스 프로세스를 쉽고 직관적으로 구현할 수 있는 모델링이 필요하다. 이에 본 논문에서는 기업간의 비즈니스 프로세스를 분석하고 BPEL을 기반으로 서비스 지향 비즈니스 프로세스를 실현수준까지 모델링한다. 또한 비주얼 언어인 UML을 사용하여 높은 수준의 기업문제에서 낮은 수준의 프로세스까지 문제를 보다 비주얼하고 효과적으로 제시한다.

• 대한가정학회지
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• 제44권4호
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• pp.49-63
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• 2006

The purpose of this study was to understand the character of career attitude according to the group type which was identified and measured by Q methodology. The subjects were 38 junior students attending hotel & food service culinary management at Kyungnam College of Information & Technology. For the study, 88 variances of Lee's career attitude were used. In the career attitude items, 26 variances of career attitude were selected by factor analysis. The 26 variances explained 70.44% of all variances. Twenty-six variances were used on Q sorting from which 9 group types were identified by SPSS window program, and these 9 occupied 75.627%n of all variance. The groups were classified into two parts extroversion and introversion. Four groups(1, 3, 6, and 9) were identified as extroversion, and 5 groups(2, 4, 5, 7, and 8) as introversion. Group 1 was explained 10.270% of all groups, group 2(14.352%), group 3(10.270%), group 4(7.527%), group 5(6.314%), group 6(5.726%), group 7(5.469%), group 8(5.006%), and group 9(4.145%). Group 1 was named as "active challenge type", group 2 as "passive consideration type", group 3 as "realistic leader type", group 4 as "conservative challenge oriented type", group 5 as "conservative harmony type", group 6 as "arbitrary plan oriented type", group 7 as "realistic stability type", group 8 as "conservative creation type" and group 9 as "conservative reality type".

• 한국임상약학회지
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• 제21권2호
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• pp.182-187
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• 2011

The Korean pharmacy education has been facing extraordinary challenges. Clinical pharmacy has been embraced into mainstream in the new curriculum since its introduction in Korea. Although these changes are positive to provide our graduates adequate knowledge and skills to meet international standards of pharmacy education, current preparedness is far from desired goals. Thus, faculty members and clinical pharmacy experts from diverse walks are tirelessly committed to develop clinically oriented educational sites. However, it is important to recognize that pharmacy practice, research, and education should be aligned with the $Profession^{\circ}{\Phi}s$ vision. Most faculty members in clinical pharmacy were unexceptionally expected to tackle educational challenges with new curriculum. All academicians must profess throughout their career. Fundamental component in academic career is research accomplishments. The prosperity of clinical pharmacy inevitably goes with research. Clinical researchers in Korea are underprivilaged over basic scientists due to less funding opportunity, administrative support, and research resources. Clinical pharmacy researchers should further overcome poor recognition among other healthcare professionals and government. Aggressive networking and support and awareness of pharmacy oriented clinical research from the Korean college of clinical pharmacy would nurture clinical pharmacy research. With research progress, clinical pharmacy would be prerogative in Korean pharmacy advance.

• 한국IT서비스학회지
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• 제10권2호
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• pp.223-234
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• 2011

Loosely coupled properties of SOA(Service Oriented Architecture) services do not guarantee that service applications always work properly. Service errors may also influence other services of SOA. These characteristics adversely affect software reliability. Therefore, it is a challenge to effectively manage system change and errors for operating services normally. In this study, we propose a SOA based framework using AOP(Aspect Oriented Programming) for reliable service applications. AOP provides a way to manipulate cross-cutting concerns such as logging, security and reliability and these concerns can be added to applications through weaving process. We define a service specification and an aspect specification for this framework. This framework also includes service provider, requester, repository, platform, manager, and aspect weaver to handle changes and exceptions of applications. Independent Exception Handler is stored to exhibited external Aspect Service Repository. When exception happened, Exception Handler is linked dynamically according to aspect rule that is defined in aspect specification and offer function that handle exception alternate suitable service in systematic error situation. By separating cross-cutting concerns independently, we expect that developer can concentrate on core service implementation and reusability, understanding, maintainability increase. Finally, we have implemented a prototype system to demonstrate the feasibility of our framework in case study.

• 패션비즈니스
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• 제14권4호
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• pp.41-57
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• 2010

DongDaeMoon fashion retail market, or so-called the new western market, has been playing an important role in DongDaeMoon area's success from 1997 to early 2000's. However, the unique and successful fashion merchandising system of DongDeaMoon retail market has been seriously threatened by consumer need changes as well as by an increased competition from new types of retail stores such as discount stores and online shopping malls. Moreover, its performance has been deteriorated due to the increased number of undifferentiated, small and medium-sized retail stores within the area. In this paper, attempts are made in building revitalization strategies for DongDeaMoon fashion retail market on the basis of analyzing fast fashion and consumers. As results, we found that DongDaeMoon fashion retail market needs cooperated area management plan from related market members. This will help DongDaemoon's image change from deal-oriented market to relationship-oriented market with consumers. Through Focus Group interview, we found DongDeaMoon fashion retail market is confronted with insufficient shopping infrastructure and new challenge from global fast fashion brand. Moreover, to overcome this situation, consumers require repaired communication activities by DongDeaMoon fashion market members on consumer relationship management basis. At the end, this paper try to provide strategic implications for DongDeaMoon fashion retailers.

• Journal of Information Technology Applications and Management
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• 제20권2호
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• pp.1-14
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• 2013

Learning accounting has always been a challenge for non-accounting students and managers. Understanding accounting information requires more than a numerical description of financial and income statements. Current accounting practice presents accounting reports in the form of tables with values or in two or three dimensional graphs generated by a spread sheet program. The present study proposes an alternative visualization with metaphor from nature as a learning device for novice users and managers. After surveying various kinds of plants, the lotus flower was chosen as an attractive analogy because every part of the plant from leaves to roots is usable and can have economic value. Moreover, lotus flowers, whether man-made or natural, can easily be part of a familiar, natural ecology representing both beauty and serenity. Results from online survey respondents (n = 220) showed that there was no significant difference on overall usability of the Lotus visualization between expert users and novice users. However, verbally-oriented users differed Significantly from visually-oriented users in their usability assessment, perceived usefulness, and intention to use the Lotus visualization.

• Advances in aircraft and spacecraft science
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• 제4권3호
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• pp.297-316
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• 2017

With rapid growth in the complexity of large scale engineering systems, the application of multidisciplinary analysis and design optimization (MDO) in the engineering design process has garnered much attention. MDO addresses the challenge of integrating several different disciplines into the design process. Primary challenges of MDO include computational expense and poor scalability. The introduction of a distributed, collaborative computational environment results in better utilization of available computational resources, reducing the time to solution, and enhancing scalability. SORCER, a Java-based network-centric computing platform, enables analyses and design studies in a distributed collaborative computing environment. Two different optimization algorithms widely used in multidisciplinary engineering design-VTDIRECT95 and QNSTOP-are implemented on a SORCER grid. VTDIRECT95, a Fortran 95 implementation of D. R. Jones' algorithm DIRECT, is a highly parallelizable derivative-free deterministic global optimization algorithm. QNSTOP is a parallel quasi-Newton algorithm for stochastic optimization problems. The purpose of integrating VTDIRECT95 and QNSTOP into the SORCER framework is to provide load balancing among computational resources, resulting in a dynamically scalable process. Further, the federated computing paradigm implemented by SORCER manages distributed services in real time, thereby significantly speeding up the design process. Part 1 covers SORCER and the algorithms, Part 2 presents results for aircraft panel design with curvilinear stiffeners.

• Advances in aircraft and spacecraft science
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• 제4권3호
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• pp.317-334
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• 2017

With rapid growth in the complexity of large scale engineering systems, the application of multidisciplinary analysis and design optimization (MDO) in the engineering design process has garnered much attention. MDO addresses the challenge of integrating several different disciplines into the design process. Primary challenges of MDO include computational expense and poor scalability. The introduction of a distributed, collaborative computational environment results in better utilization of available computational resources, reducing the time to solution, and enhancing scalability. SORCER, a Java-based network-centric computing platform, enables analyses and design studies in a distributed collaborative computing environment. Two different optimization algorithms widely used in multidisciplinary engineering design-VTDIRECT95 and QNSTOP-are implemented on a SORCER grid. VTDIRECT95, a Fortran 95 implementation of D. R. Jones' algorithm DIRECT, is a highly parallelizable derivative-free deterministic global optimization algorithm. QNSTOP is a parallel quasi-Newton algorithm for stochastic optimization problems. The purpose of integrating VTDIRECT95 and QNSTOP into the SORCER framework is to provide load balancing among computational resources, resulting in a dynamically scalable process. Further, the federated computing paradigm implemented by SORCER manages distributed services in real time, thereby significantly speeding up the design process. Part 1 covers SORCER and the algorithms, Part 2 presents results for aircraft panel design with curvilinear stiffeners.