• Transactions on Electrical and Electronic Materials
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• v.17 no.4
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• pp.217-221
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• 2016

In this work, open and short stubs that were fabricated on the silicon substrate and for which the periodically arrayed grounded-strip structure (PAGS) was employed were studied along with their basic RF characteristics for an applicability regarding the RF-matching components. The PAGS-employing open and short stubs showed losses that are much lower than that of the conventional stub on the silicon substrate. Concretely, the Q values of the open and short stubs are 9 and 10.2, respectively, while the Q value of the conventional open stub is 2.5. With the use of the PAGS-employing open and short stubs, a highly miniaturized harmonic-rejection filter was also fabricated on the silicon substrate. The filter exhibited a comparatively sound harmonic-suppression characteristic at n × 13 GHz, and its size is 0.1 mm², which is only 7% of the size of the conventional filter on the silicon substrate.

• Journal of applied mathematics & informatics
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• v.39 no.5_6
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• pp.805-811
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• 2021

Currently, batteries use commonly as energy sources for mobile electric devices. Due to the high density of energy, the energy storage state of a battery is very important information. To know the battery's energy storage state, it is necessary to find out the open state voltage of the battery. The open state voltage calculates with a mathematical model, but the computation of the real time state is complicated and requires many calculations. Therefore, the state observer designs to estimate in real time the battery open-circuit voltage as disturbance including model error. Using the estimated open voltage and applying it to the state estimation algorithm, we can estimate the charge. In this study, we first estimate the open-circuit voltage and design an estimation algorithm for estimating the state of battery charge. This includes errors in the system model and has a robust characteristic to noise. It is possible to increase the precision of the charge state estimation.

• Journal of Korean Foot and Ankle Society
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• v.22 no.4
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• pp.170-172
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• 2018

An ankle sprain is a relatively common sports-related injury but a severe open ankle sprain (SOAS) is very rare. A 27-year-old female athlete was injured during running and was hospitalized because of an inversed ankle injury with an open wound. She was diagnosed initially with an open-avulsion fracture at the tip of the fibula with an anterior talofibular ligament tear. The patient was finally diagnosed with SOAS from the surgical findings and literature review. SOAS should also be considered if there is a transverse open wound at the time of an ankle injury.

• Human Ecology Research
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• v.59 no.3
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• pp.287-296
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• 2021

This study examined the influences of demographic variables, parent-adolescent conversation time, and open communication on the positive psychological capital of adolescents. The data were collected from 243 middle school students living in Gwangju from December 23, 2019, to January 3, 2020. Data were analyzed using correlation analysis, and hierarchical regression analysis. The results can be summarized as follows. First, with economic condition, academic achievement, parent-adolescent conversation time, and open communication, positive psychological capital showed significant difference statistically. Second, father-adolescent open communication best explained positive psychological capital, followed by academic achievement, and mother-adolescent open communication. The results highlight the important roles played by parent-adolescent open communication and academic achievement in improving adolescents'positive psychological capital. The study contributes to the literature by providing fundamental insights into adolescents'positive psychological capital.

• International Journal of Advanced Culture Technology
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• v.10 no.2
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• pp.53-61
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• 2022

This study suggested the environmental components for open space in a healing environment based on the social support approach for integrating and enhancing users' activities and interactions. The physical environments of the open space in healing facilities should be suggested by social support design and support the interactions of various users. Particularly architectural environment conditions should reinforce the contribution to the revitalization of medical facilities based on improving the healing effect of patients through mutual exchange of users. The open space environment conditions influence users' healing process with physical design factors and users' interactions, and the flexible environments based on the social support that is crucial for circulation and mutual exchange of users. The open space transformation, integration of technology, and wayfinding system with color and signage also allow users to improve the space experience and easy access. The environmental components of open space design should include easy access for user inflow, flexible layout for comfort, access to outdoor spaces, integration of warm color schemes for relaxation, personalization of spaces with artwork, and visual interest through the use of textures and materials.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.04a
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• pp.1389-1392
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• 2009

OpenID는 서비스와 ID 관리를 사이트 독자적으로 수행하는 Silo 모델의 계정 및 정보 관리 문제를 해결한다. 그러나 악의적인 공격자로 인한 OpenID Provider에 대한 피싱 공격 위험이 발견됨에 따라 개인 정보 유출에 대한 큰 위협이 되고 있다. 본 논문에서는 기존 OpenID 구조에 인증기관을 추가하여 사용자 인증 이전에 IDP에 대한 유효성 검증을 먼저 수행함으로써 IDP 피싱으로 인한 개인 정보 유출 문제를 사전에 방지 할 수 있는 인증기관을 이용한 OpenID 피싱 방지 기법을 제안한다. 또한, 기존의 OpenID 피싱 방지 기법과의 비교 실험을 통하여 편리성, IDP 신뢰성, 피싱 공격의 대한 안전성 항목에서 우수함을 확인 할 수 있었다.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.04a
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• pp.1109-1111
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• 2009

Android OpenGL ES Issue Report에서 제기된 Android Emulator에서의 OpenGL 연산속도 문제를 Matrix 연산이 많이 사용되는 OpenGL 3D 구현에서 확인하고 이를 개선할 수 있는 방법을 제시한다. Android Emulator에 포함된 OpenGL ES는 소프트웨어 방식의 OpenGL ES 1.5가 사용되고 있다. 이때 Floating Point가 개선되면 3D의 연산 속도를 높일 수 있을 것이다. 이를 위하여 본 논문에서는 Android Emulator를 수정하여 개선하고, 샘플코드를 통해 테스트 결과를 제시한다.

• Asia Marketing Journal
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• v.19 no.4
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• pp.61-85
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• 2018

Open innovation is based on a different knowledge landscape, with a different logic about the sources and uses of technologies. It implies that firms increasingly rely on external sources of innovation by emphasizing these ideas and resources. Using datasets from the UK biotechnology industry, this paper explores firms' willingness to participate in open innovation. The results indicate that the switching cost is identified as the direct predictor of the willingness to participate in open innovation. While high commitment based on the trust with partner increases switching costs, IT infrastructure within the firm decreases switching costs to open innovation. Taken together, this research broadens the study on open innovation by applying the switching cost as a medium of knowledge transfer in the biotech industry.

• Educational Technology International
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• v.11 no.2
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• pp.149-172
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• 2010

Knowledge can be more meaningful when it is shaped and personalized through interaction with others. Implementation of open learning environments such as open courseware or shared knowledge communities has gradually become more common. A case study which investigated instructors' experiences and perceptions of publishing and using open courseware in the classroom was conducted at a university in Korea. Responses from participating students and an evaluation group regarding how they perceived open learning environments were also examined. Based on the inductive analysis of the data, this study discusses advantages and challenges of publishing open courseware and collaborative learning environments. Also, practical guidelines for developing reusable learning materials are suggested.

• Journal of The Korean Astronomical Society
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• v.34 no.3
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• pp.137-141
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• 2001

We derive a new relationship between the giant branch slope as measured in the color-magnitude diagram (K, J - K) and [Fe/H] metallicity for old open clusters. Previously such relationships have been derived for globular clusters, while similar tendency has been expected for open clusters. New derived correlation, [Fe/H]=-17.2($\pm$0.23)GB slope - 1.95($\pm$0.02), is based on a collection of data for 10 old open clusters. Most clusters behave as expected from the theoretical predictions.