• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.3
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• pp.582-590
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• 2016

This study examined the relationships among smartphone addiction, parenting attitudes and resilience to identify the relevant factors affecting smartphone addiction. Data were collected from a total of 220 middle school students responding to questionnaires in G city and analyzed using descriptive statistics, independent t-test, ANOVA, $Scheff{\acute{e}}$ test, Pearson coefficient correlation, and multiple regression. The results showed that the parenting attitude and resilience were negatively correlated with smartphone addiction. The significant factors affecting smartphone addiction were gender, the time of smartphone usage, parenting attitudes, and resilience. These variables explained 21.9% of smartphone addiction and the highest factor was the parenting attitudes, followed by gender, time of smartphone usage, and resilience. This study indicated that it is important to develop a program to ensure adolescents positively perceive parenting attitudes and increase their resilience to decrease the incidence of smartphone addiction.

• Journal of the Korean Society for Precision Engineering
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• v.6 no.4
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• pp.21-31
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• 1989

역사적으로 CNC기술이 생산성향상에 기여한바는 매우 크다. 최근에는 고도의 생산성을 추구하는 CNC공작기계는 수요자들의 요구에 부응하여 관련업계는 CNC 기술의 발전을 더욱 가속화 시키고 있다. 오늘날의 CNC는 더욱 향상된 Computer Architecture에 적합한 Software System과 고속, 고집적의 소자기술을 결합한 것이라 볼 수 있으며, 그 결과는 생산을 자동화 하고 전체를 하나의 system화 하려는 요구에 부응하고 유연(Flexible)하며, 사용하기에 편리하고(User-friend- ly), 신뢰성과 높은 생산성을 갖추고 있다. 새로운 CNC 기술이 요구되는 응용분야는 고도로 자동 화 되고 결합 된 FMS에서 부터 단축제어용에 이르기까지 매우 광범위하다. 3축의 Milling, 6축 Machining Center, 전용기 등 Stand-alone 기계들을 위주로한 중소형기계 공장에 적합한 CNC 기술이 개발되고 있는 동시에 CELL LEVEL, 좀더 큰 규모의 FMS 또는 그 이상으로 자동화된 system을 구성하 기 위하여 많은 새로운 기능이 요구되고 종래의 CNC와는 다른 역할의 변화가 필요하다. 실제로는 많은 경우에 이러한 두가지의 응용이 공존하고 있으며, CNC의 기능이나 성능을 희생하지 않고 동일한 Hardware로 여러가지의 응용을 만족시켜야 한다. 생산공정과 생산기술의 변화가 반영되어야 하며, Control 기술도 변화하고 있다. 유연하고 확장가능한 Software, Hardware 구조의 CNC가 실제적으로 가장 Cost-effective한 해결책이다.

• Journal of Digital Convergence
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• v.11 no.6
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• pp.91-101
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• 2013

The purpose of this study is to empirically verify the relationship between supply chain flexibility(process flexibility and logistics flexibility) and competitive advantage strategy(cost, quality, lead time). To accomplish these purposes, the relationships among supply chain flexibility(process, logistics), competitive advantage strategy(cost, quality, lead time) were modeled based on the studies conducted in the various areas. In order to collect the related data the questionaries of 500 were distributed to the employees working at the manufacturing industry in the area of Gumi. The collected data were analyzed with SPSS 18.0 for Windows. This study used the statistical techniques such as descriptive analysis, reliability analysis, factor analysis, correlation analysis, multi regression analysis. The results of the study show that process flexibility had positively significant effect on low cost strategy and high quality strategy and logistic flexibility have positively significant effect on delivery speed strategy. However, it was found that process flexibility did not have the significant effect on delivery speed strategy, and the logistic flexibility did not have the significant effect on low cost and high quality strategy. Thus, it is expected that each enterprise can maximize corporate strategies by applying different flexibility strategy depending on the competitive advantage strategy.

• Proceedings of the Korean Information Science Society Conference
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• 2002.04a
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• pp.331-333
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• 2002

통신환경의 급속한 변화는 새로운 서비스가 신속하게 개발되고 적용되도록 인력의 운용을 요구하게 되었으며 끊임없이 기존 시스템과의 통합이 요구하였다. 기술의 급속한 발전과 CORBA의 표준화는 이기종 시스템과 정보공유 및 통신이 가능하게 하였다. 본 논문에서는 웹을 이용한 초기기술인 HTTP/CGI/HTML방식이 아닌 CORBA와 JSP를 활용하여 분산환경 및 무선환경하에서 접근이 될 수 있도록 UML을 이용하여 작업관리기능을 설계 및 프로토콜타입을 구현하였다. 본 논문에서 제시만 구조는 이전방식이 유연성 또는 분산화에 중점을 둔 반면 유연성, 통합화, 분산화가 가능하다. 특히 통신환경에서 신속한 서비스의 제공이 가능하다.

• Proceedings of the Korean Information Science Society Conference
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• 2011.06d
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• pp.194-197
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• 2011

네트워크 가상화 기술은 하드웨어적인 제약사항을 완화시켜 다양한 서비스를 제공하는 네트워크 토폴로지를 구성할 수 있도록 하는 기술로써, 미래 인터넷 환경과 클라우드 컴퓨팅을 지원 할 수 있는 기술이다. 또한 가상화된 네트워크를 제공하기 위한 소프트웨어 기반의 라우터는 하드웨어의 라우터보다 상대적으로 비용이 저렴하고 높은 유연성과 유지 보수성을 갖는다. 소프트웨어 기반의 라우터를 통하여 물리적인 네트워크 위에서 각기 다른 서비스를 제공하는 다양한 가상 네트워크들을 공존하게 하고, 다양한 서비스를 효과적으로 제공하기 위해서는 각 네트워크의 독립성과 서비스의 품질 제어가 필요하다. 이 논문에서는 네트워크 가상화를 통하여 각 가상 네트워크들의 독립성을 보장하는 Network Isolation 기술과 QoS 보장을 위한 동적인 대역폭 조절을 제공하는 Performance Isolation 기술을 제안한다. 이를 통하여 기존 하드웨어 라우터에서는 제공되지 않은 높은 유연성 과 다양한 응용, 비용의 절감, 유지 보수의 용이성 등을 제공 할 수 있다.

• Journal of Korea Society of Industrial Information Systems
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• v.15 no.3
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• pp.77-92
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• 2010

The purpose of this study is to explore how IT routines influence firm performances. To do this, a research model are proposed which includes 5 constructs: firm performance, business process performance, IT infrastructure flexibility, IT personnel knowledge, and IT routines. It is presumed that the IT routines enhance other IT capabilities (IT infrastructure flexibility and IT personnel knowledge) and subsequently business process performance which in turn influence firm performance. Then, with 243 firm level data, the proposed dynamics were empirically validated and tested using PLS. The study result revealed that all the routes proposed in the model are statistically significant.

• Proceedings of the Korean Fiber Society Conference
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• 1998.10a
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• pp.187-190
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• 1998

섬유의 후가공공정은 그 목적에 따라 유연가공, 발수가공, 방추가공 등 여러 가지로 분류할 수 있고 실리콘은 이러한 공정에서 유용하게 사용되고 있다. 최근에는 이러한 물성을 복합적으로 갖는 다기능형 섬유의 요구가 커지고 있어 복합가공에 적당한 가공제가 필요하게 되었다. 본 연구에서는 섬유에 발수성, 유연성, 방추성, 내구성을 부여하기 위한 방법으로 불소계발수제와 상용성이 우수한 반응형 실리콘을 선정하고 이를 불소계발수제, 실란가교제등과 혼합(formulation)하여 면섬유에 적용하여 원하는 물성을 얻기 위한 최상의 가공조건을 개발하고자 한다. (중략)

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.6
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• pp.498-507
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• 2020

The purpose of this study was to examine the effects of thoracic flexibility exercise on sitting balance, static standing balance, gait parameters, and the fall risk of patients with chronic stroke. The participants were randomized into the control (n=12) and thoracic flexibility exercise groups (n=12). Both groups received standard rehabilitation therapy for 30 minutes per session. The subjects in the experimental group performed additional thoracic flexibility exercises 3 times a week for 6 weeks. The trunk impairment scale, static standing balance, gait speed, cadence, and fall risk were assessed for all the participants before and after the intervention. The thoracic flexibility exercise group showed greater improvement than did the control group on the trunk impairment scale (t=-3.57, p=.002), static standing balance (t=5.37, p<.001), gait speed (t=-3.29, p=.003), cadence (t=-2.77, p=.011), and fall risk (t=6.33, p<.001). Furthermore, the thoracic flexibility exercise group significantly improved all the outcomes compared to the baseline values (P<.05). This study showed that the thoracic flexibility exercise improved the functional ability of patients with chronic stroke.

• Journal of the Korean Applied Science and Technology
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• v.36 no.1
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• pp.200-207
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• 2019

In this study, flexible supercapacitor based on the all solid state electrolyte with PVA (polyvinyl alcohol)-$H_3PO_4$, ionic liquid as a BMIMBF4 (1-buthyl-3-methylimidazolium tetrafluoroborate) and reduced graphene oxide/conductive polymer composite was fabricated and characterized electrochemical properties with function of its flexibility. In order to measure and compare that electrochemical performances (including cyclic voltammetry(CV), electrochemical impedance spectroscopy(EIS) and galvanostatic charge/discharge,after 0~100th bending test) of prepared flexible supercapacitor based on reduced graphene oxide/conducting polymer composite and all solid state electrolyte, we have conducted press machine with constant pressure ( 0.01/cm2) for $100^{th}$ bending test. As a result, specific capacitance of the flexible supercapacitor was 43.9 F/g which value decreased to 42.0 and 40.1 F/g after 50 and $100^{th}$ bending test, respectively. This result exhibited that decreased electrochemical property of the flexible supercapacitor effected on physical stress on the electrode after repeated bending test. In addition, we have measured that electrode surface morphology by SEM to prove its decreased electrochemical property of the flexible supercapacitor after prolonged bending test.

• Aerospace Engineering and Technology
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• v.9 no.2
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• pp.73-79
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• 2010

In this study, the equivalent elastic modulus of flexible textile composites was predicted by nonlinear finite element analysis. The analysis was carried out considering the material nonlinearity of fiber tows and the geometrical nonlinearity during large deformation using commercial analysis software, ABAQUS. To account for the geometrical nonlinearity due to the large shear deformation of fiber tows, a user defined material algorithm was developed and inserted in ABAQUS. In results, nonlinear stress-strain curve for the flexible textile composites under uni-axial tension was predicted from which effective elastic modulus was obtained and compared to the test result. The effective elastic moduli were calculated for the various finite element models with different waviness ratio of fiber tow.