• Journal of Korean Society of Steel Construction
• /
• v.18 no.2
• /
• pp.251-259
• /
• 2006

In some cases, wooden structures are used for medium-rise buildings. It is therefore necessary to develop and test a new structural system for medium-rise buildings using wooden structures. This study deals with high-performance, laminated, timber-based composite members, which consist of structural laminated timber and H-beam. Simple beam tests were performed to determine the strength, stress distributions, and failure patterns of laminated timber. The main parameters are the insertinglength (1, 1.5, and 2 times the H-beam height) and the epoxy between the top/bottom flange of the H-beam and the top/bottom flange of the laminated timber. The results of the test show that the specimen with an inserting length that is 2 times the H-beam height was characterized by fairly god strength and stiffness.

• Journal of Dental Rehabilitation and Applied Science
• /
• v.34 no.4
• /
• pp.317-323
• /
• 2018

When oral cancer develops in the maxilla, oro-nasal communication occurs after surgical treatment including removal of the primary site. Restoration through an obturator is necessary to prevent food from storing due to non-oral opening, and to ensure proper pronunciation and aesthetic restoration. In this case, the patient was treated with right hemi-maxillectomy due to oral cancer and has residual abutment and poor periodontal support due to the effect of head and neck radiotherapy. The obturator was treated with a hybrid telescopic double crown denture. Reporting a successful prognosis in 18 months of follow-up.

• Journal of the Korea Concrete Institute
• /
• v.25 no.6
• /
• pp.631-639
• /
• 2013

Non-linear finite element analysis for newly developed precast concrete details for beam-to-column connection which can be used in moderate seismic region was carried out in this study. Developed precast system is based on composite structure and which have steel tube in column and steel plate in beam. Improving cracking strength of joint under reversed cyclic loading, joint area was casted with ECC (Engineering Cementitious Composites). Since this newly developed precast system have complex sectional properties and newly developed material, new analysis method should be developed. Using embedded elements and models of non-linear finite element analysis program ABAQUS previously tested specimens were successfully analyzed. Analysis results show comparatively accurate and conservative prediction. Using finite element model, effect of axial load magnitude and flexural strength ratio were investigated. Developed connection have optimized performance under axial load of 10~20% of compressive strength of column. Plastic hinge was successfully developed with flexural strength ratio greater than 1.2.

• Proceedings of the Korea Multimedia Society Conference
• /
• 2002.11b
• /
• pp.478-481
• /
• 2002

가상환경을 이용한 다양한 응용분야에서는 체감에 의한 실재감을 처리하는 것이 요구되고 있다. 체감의 효과를 표현하기 위한 일반적인 형태는, PhanTom에서 사용 가능한 햅틱 라이브러리를 사용하지만, 고비공과 처리 속도 문제 때문에 그 사용의 한계를 가진다. 본 논문에서는 햅틱 렌더링의 근본적인 문제인 실시간 렌더링 문제를 극복하기 위한 비선형 보간에 의한 근사 방법을 제안한다. 제안하는 방법은 하이브리드 접근 방식으로, 캐릭터에 작용하는 동역학적 움직임을 햅틱 효과 생성을 위하여 기하학적으로 재구성함으로써 체감효과 생성에 필요한 시간을 최소화 할 수 있다. 본 논문의 결과로는 캐릭터의 빈번한 제어에서 발생되는 체감 효과를 빠르게 생성할 수 있음을 보이며, 안정적이면서 그럴 듯한 효과를 생성할 수 있음을 보인다.

• Journal of the Institute of Electronics Engineers of Korea TC
• /
• v.45 no.1
• /
• pp.66-71
• /
• 2008

In this paper, an antenna-switching scheme using negative acknowledgement for hybrid automatic repeat request (H-ARQ) is proposed and analyzed in the Vertical Bell Labs Layered Space-Time(V-BLAST) system, in which the transmit antenna is alternatively switched under retransmission. By analytically evaluating the channel capacity of the proposed scheme over correlated fading channels, it is shown that the adverse effect of the channel correlation is alleviated by the antenna switching scheme. Simulation results demonstrate that the average throughput may be improved in a correlated fading channel without adding much complexity to the process.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2001.10a
• /
• pp.631-634
• /
• 2001

가상 현실이나 게임 제작 분야에서는 움지임에 따른 변형을 실시간으로 처리하는 것이 요구되고 있다. 변형 처리를 위한 일반적인 모델은 질량-스프링(mass-spring) 방법을 이용한 것으로, 그 구현이 쉽고 처리 속도가 빨라 대화형 시스템(interactive system)에서 실시간 처리를 위한 모델로 주목되고 있다. 반면에, 이 모델은 외부의 제어에 대하여 super-elastic한 문제를 내포하여 그 적용이 제한되어 있다. 본 논문에서는 스프링 모델의 근본적인 문제인 super-elastic 문제를 극복하기 위한 근사 방법을 제안한다. 제안하는 방법은 하이브리드 접근 방식으로, 이산 점 사이의 내부 힘들을 선처리(pre-processing)하여 elastic한 성분을 나누어 처리한다. 선처리 과정에서는 변형 물체의 물리적 속성에 따라 늘어나는(elongation) 성분과 굽어지는(bending) 성분을 따로 처리함으로써, 극심히 늘어나는(super-elongation) 문제를 극소화할 수 있다. 본 논문의 결과로는 빈번한 제어에 대응되는 움직임을 빠르게 생성할 수 있음을 보이며, 안정적이면서 그럴 듯한 움직임을 생성할 수 있음을 보인다.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2002.11a
• /
• pp.809-812
• /
• 2002

가상 현실이나 게임 제작 분야에서는 체감에 의한 실재감을 실시간으로 처리하는 것이 요구되고 있다. 체감 효과를 표현하기 위한 일반직인 형태는 PhanTom에서 사용 가능한 햅틱 라이브러리를 사용하지만, 처리 속도의 문제 때문에 대화형 시스템(interactive system)에는 그 사용의 한계를 가진다. 본 논문에서는 햅틱 렌더링의 근본적인 문제인 실시간 렌더링 문제를 극복하기 위한 비선형 보간에 의한 근사 방법을 제안한다. 제안하는 방법은 하이브리드 접근 방식으로, 캐릭터에 작용하는 동역학적 움직임을 햅틱 효과 생성을 위하여 기하학적으로 재구성함으로써 체감효과 생성에 필요한 시간을 최소화 할 수 있다. 본 논문의 결과로는 캐릭터의 빈번한 제어에서 발생되는 체감 효과를 빠르게 생성할 수 있음을 보이며, 안정적이면서 그럴 듯한 효과를 생성할 수 있음을 보인다.

• Cartoon and Animation Studies
• /
• s.18
• /
• pp.37-56
• /
• 2010

This paper focalizes on the 'evolution' of monster animation and . Actually, Many characters' 'Evolution' is a very powerful convention of Japanese genre animation. Lots of young people feel a huge pleasure about character's evolution. It is a fantastic spectacle to boys and girls. The first characteristic point of characters' evolution is growing-up body to an adult. For example, magical girls genre shows a woman's sexy body. This scene gives a sexual fantasy to young girl spectators, a voyeuristic visual pleasure to young boy spectators. The second point is that a transforming-body gains some super power or magical power. The third point is that a great many characters is in one text. In , characters' numbers go on increasing through 6 ways-hybrid type, mutant-reiteration type, metamorphosis type, simple-grownup type, narrative type, multiple evolution type. The evolution of has to pay attention to only one transforming way. Most Digimon characters are becoming to a human-weapons cyborg. In my opinion, this is very dangerous phenomenon with a political ideology.

• Journal of Advanced Marine Engineering and Technology
• /
• v.40 no.9
• /
• pp.786-790
• /
• 2016

This paper discusses numerically explored orientation effects on the thermal performance of hollow hybrid fin heat sinks (HHFHSs) under natural convection. A HHFHS consists of an array of hollow pin fins concatenated with plate fins and having perforations near the fin bases. Orientation effects on the footprint-based and mass-based thermal performance of the HHFHS were numerically studied for orientation angles ranging from $0^{\circ}$ to $180^{\circ}$. The performance of the HHFHS was compared with that of a pin fin heat sink (PFHS) having similar physical parameters. The results show that the thermal resistance of the HHFHS did not vary considerably from $0^{\circ}$ to $45^{\circ}$. The thermal resistance increased from $45^{\circ}$ to $90^{\circ}$, reached its maximum at $90^{\circ}$, and decreased consistently from $90^{\circ}$ to $180^{\circ}$. Dissimilar behaviors of the thermal resistance of the HHFHS vs. the PFHS resulted mainly from the effect of heat pumping induced by the internal flows of the hollow fins. Despite various orientations, the mass-based thermal resistance of the HHFHS was found to be nearly 30% smaller than that of the PFHS. This result shows the feasibility of the HHFHS for the lightweight thermal management of electronics under natural convection.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.19 no.4
• /
• pp.543-550
• /
• 2018

The rapid growth of IoT technology induced by the fourth industrial revolution has resulted in research into various types of wireless sensors, and applications based on this technology are prevalent in many areas. However, among the various sites where this technology is used, railway bridges and tunnels with lengths of tens of kilometers have problems with data acquisition, due to the signal noise induced by the long distance measurement and EMI induced by the high voltage power feeding system, when conventional electric sensors are used. To overcome these problems, many studies on fiber optic sensors have been conducted as a substitute for the conventional electric sensors. However, restrictions on the types of fiber optic sensors have limited their application in railways. For this reason, a hybrid measurement system with IoT based wireless data communication, in which both electric and fiber optic sensors can be applied simultaneously, has been developed. In this study, in order to evaluate the applicability of the hybrid measurement system developed in the previous study, a real-time test for 4 types of measurement environments, which reflect possible railway sites, is performed. As a result, it was confirmed that the signals from both the electric and fiber optic sensors, which were acquired at a remote area in real-time, showed good agreement with each other and that this measurement system has the potential to handle sensors with a sampling rate of 2.5 kHz. In the future, it is expected that the IoT-based hybrid measurement system will contribute to the improvement of structural safety by enabling real-time structural health monitoring when applied to various measurement sites.