• Proceedings of the Materials Research Society of Korea Conference
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• 2009.05a
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• pp.3.2-3.2
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• 2009

Development of printed electronics, which is occasionally referred to as 'flexible' or 'polymer' electronics, has attracted considerable world wide attention in recent years. Printed (or flexible) electronics is currently expected to represent a new form of electronics and open up wide ranging applications in displays, electron devices for medical use, sensors, and other areas. This presentation aims to provide a strategy for scalable and viable paths to accomplish flexible, printable, large area circuits displaying high performance. Novel approaches evolving from system on package (SoP) to system on flex (SoF) technology will allow the integration of heterogeneous materials platforms into a system which is needed to enhance the functionality of the system. The talk also includes speculations about areas on which future advances in printed electronics could have a substantial impact along with a brief introduction of the Korea Printed Electronics Association (KoPEA).

• Proceedings of the Korean Information Science Society Conference
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• 2006.06b
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• pp.58-60
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• 2006

상담 효과를 극대화할 수 있는 면대면 상담은 교수와 학생의 상담 시간과 장소를 일치시켜야 하는 번거로움이 있지만 자동화된 상담 예약 시스템을 통해 극복할 수 있다. 이에 더해, 시스템이 프로세스와 데이터 복잡성을 대폭 감소시킬 수 있는 인터페이스를 제공한다면 면대면 상담을 더욱 효과적으로 지원할 수 있다. 이 논문에서는 RIA(Rich Internet Application) 기술을 적용한 교수-학생 상담 예약 시스템을 제안하고, 적용된 리치 클라이언트, 서버, 개발 툴 기술에 대해 알아본다. 제안한 시스템에서 사용자는 동적이고 풍부한 상호작용을 가능하게 하는 리치 클라이언트를 통해 상담 예약 시스템에 접속하여 원스크린 (OneScreen) 시스템으로 상담 예약을 할 수 있기 때문에 프로세스와 데이터 복잡성으로부터 벗어날 수 있다. 또한, 개발자는 Flex와 ColdFusion서버 기술과 FlexBuilder 개발 툴을 이용해 마르게 웹 어플리케이션을 개발할 수 있다는 것을 알 수 있다. 향후 RIA 구현 기술은 풍부한 상호작용을 요구하는 웹 어플리케이션 개발에 널리 적용될 것으로 기대된다.

• Structural Engineering and Mechanics
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• v.76 no.3
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• pp.355-365
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• 2020

In this study, considering the hydroelastic response represented by the springing and whipping phenomena, we propose a method of estimating the fatigue damage in the longitudinal connections of ships. First, we screened the design sea states using a load transfer function based on the frequency domain. We then conducted a time domain fluid-structure interaction (FSI) analysis using WISH-FLEX, an in-house code based on the weakly nonlinear approach. To obtain an effective and robust analytical result of the hydroelastic response, we also conducted an experimental model test with a 1/50-scale backbone-based model of a ship, and compared the experimental results with those obtained from the FSI analysis. Then, by combining the results obtained from the hydroelastic response with those obtained from the numerical fatigue analysis, we developed a fatigue damage estimation method. Finally, to demonstrate the effectiveness of the developed method, we evaluated the fatigue strength for the longitudinal connections of the real ship and compared it with the results obtained from the model tests.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2012.05a
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• pp.1219-1220
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• 2012

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2007.12a
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• pp.319-321
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• 2007

엘엔지운반선(LNGC)의 대형화에 따른 잇단 대형선의 건조과정을 살펴보고 향후의 발전과정을 살펴보도록 한다.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2002.05a
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• pp.226-232
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• 2002

• Review of Korea Contents Association
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• v.16 no.1
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• pp.37-40
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• 2018

• 전자공학회논문지 IE
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• v.43 no.4
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• pp.28-36
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• 2006

In this paper, an algorithm to classify the 4 motions of arm and a control system to position control the prosthesis are studied. To classify the 4 motions, we use flex sensors which is electrical resistance type sensor that can measure warp of muscle. The flex sensors are attached to the biceps brchii muscle and coracobrachialis muscle and the sensor signals are passed the sensing system. 4 motion of the forearm - flexion and extension, the pronation and supination are classified from this. Also position of forearm is measured from the classified signals. Finally, A two D.O.F prosthesis arm with RC servo-motor is designed to verify the validity of the algorithm. At this time, fuzzy controller is used to reduce the position error by rotary inertia and noise. From the experiment, the position error had occurred within about 5 degree.

• Journal of Korean Academy of Nursing
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• v.36 no.7
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• pp.1111-1122
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• 2006

Purpose: This study examined the effects of aerobic exercise using a flex band on the improvement of physical functions & body image in breast cancer women undergoing radiation therapy after a mastectomy. Method: Women with breast cancer(n =26) were assigned to an experimental group(EG, n = 15) and control group(CG, n = 11). The E.G participated in an aerobic exercise program with a 60% to 80% intensity of maximal heart rate for 25 minutes during the main exercise, 3 times per week, for 6 weeks. The EG did not exercise regularly for 3 months before participating in this program. The CG received no exercise treatment during the research period. Data were analyzed using the $x^2-test$ and Mann-Whitney U test by the SPSS version 11.0 program at a 5% significant level. Results: Group analysis revealed that the EGwomen had significantly more improved cardio-pulmonary functions, ROM of the affected shoulder joint, and body image compared to the CG, Conclusion: Aerobic exercise using a flex band may be an effective rehabilitative measure for mastectomy women with respect to cardio-pulmonary functions, ROM, & body image. Further studies are recommended to study early rehabilitation programs within 10 days post-operatively.

• Restorative Dentistry and Endodontics
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• v.42 no.4
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• pp.282-289
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• 2017

Objectives: It was aimed to compare the cyclic fatigue resistances of ProGlider (PG), One G (OG), and HyFlex EDM (HEDM) nickel titanium glide path files in single- and double-curved artificial canals. Materials and Methods: 40 PG (16/0.02), 40 OG (14/0.03), and 40 HEDM (10/0.05) single-file glide path files were used in the present study. Sixty files were subjected to cyclic fatigue test by using double-curved canals and 60 files by using single-curved canal (n = 20). The number of cycles to fracture (NCF) was calculated and the length of the fractured fragment (FL) was determined by a digital micro-caliper. Twelve pieces of fractured files were examined with scanning electron microscope to determine fracture types of the files (n = 2). The NCF and the FL data were analyzed using one-way analysis of variance and post hoc Tukey test using SPSS 21 software (p < 0.05). Results: In all of the groups, NCF values were significantly lower in double-curved canals when compared to single-curved canals (p < 0.05). For both of single- and double-curved canals, NCF values of HEDM group in apical and coronal curvatures were found to be significantly higher than NCF values of PG and OG groups (p < 0.05). In both of single- and double-curved canals, NCF value of PG group was found significantly higher than OG group (p < 0.05). Conclusions: Within the limitations of this study, HEDM glide path files were found to have the highest cyclic fatigue resistance in both of single- and double-curved canals.