Earticle

The purpose of this study is to investigate on usage for 'Kajang, Deo, Deol' of degree adverbs and extract a list of co occurrent words with 'Kajang, Deo, Deol by the part of speech presented in Korean University textbooks for Korean learners. For this study, the corpus was analyzed through classifying 59 Korean university textbooks to extract co occurrent words named predicates by the part of speech at different level of textbooks. The result shows that 'Kajang' and ‘Deo’ has a higher frequency of cooccurrence with gradable antonym adjectives in each level. In contrast, ‘Deol’ has rare cooccurrence with adjectives. In the aspect of usage with verbs of ‘Kajang’ and ‘Deol’ is highly collocated with ‘like’ verb in every level. Especially, ‘Kajang’ is collocated with some psychological verbs. ‘Deo’ is highly collocated with some kind of action verbs intermediate and advanced level. In the aspect of usage with adverbs, ‘Kajang’ is collocated with ‘mani’ ‘Deo’ is collocated with ‘jom’ in basic level and ‘jeomjeom, jogeum, holshin’ in intermediate and advanced. In the aspect of usage with nouns ‘Kajang’, ‘Deol’ is collocated with ‘static noun’ but ‘Deol’ has rare frequencey of ‘noun’. Noteworthy results are that ‘Deo’ and ‘Deol’ has some marked meaning when collocated with special action verbs. Deo has a marked meaning of ‘ strengthening’ when combined with action verbs such as ‘eat, give, wait, go’ and 'Deol' have a marked meaning of 'incompletion'.when combined with action verbs such as ‘wake up, do, leak, write. In hence, I will also present some possibility of application for Korean Language Education for Korean learners based on Corpus analysis. Eventually I expect that the results of this study will be applied to teaching methods of the degree adverbs 'Kajang', 'deo', 'deol' for Korean learners, and construction of Korean textbooks.

The purpose of this study is to investigate on usage for 'Kajang, Deo, Deol' of degree adverbs and extract a list of co occurrent words with 'Kajang, Deo, Deol by the part of speech presented in Korean University textbooks for Korean learners. For this study, the corpus was analyzed through classifying 59 Korean university textbooks to extract co occurrent words named predicates by the part of speech at different level of textbooks. The result shows that 'Kajang' and ‘Deo’ has a higher frequency of cooccurrence with gradable antonym adjectives in each level. In contrast, ‘Deol’ has rare cooccurrence with adjectives. In the aspect of usage with verbs of ‘Kajang’ and ‘Deol’ is highly collocated with ‘like’ in every level. Especially, ‘Kajang’ is collocated with some psychological verbs. ‘Deo’ is highly collocated with some kind of action verbs intermediate and advanced level. In the aspect of usage with adverbs, ‘Kajang’ is collocated with ‘a lot(mani)’, ‘Deo’ is collocated with ‘a little(jom)’ in beginning and ‘jeomjeom, jogeum, holshin’ in intermediate and advanced. In the aspect of usage with nouns ‘Kajang’, ‘Deol’ is collocated with ‘static noun’ but ‘Deol’ has rare frequencey of ‘noun’. Noteworthy results are that ‘Deo’ and ‘Deol’ has some marked meaning when collocated with special action verbs. Deo has a marked meaning of ‘ strengthening’ and 'Deol' have a marked meaning of 'incompletion'. In hence, I will also present some possibility of application for Korean Language Education for Korean learners based on Corpus analysis. Eventually I expect that the results of this study will be applied to teaching methods of the degree adverbs 'Kajang', 'deo', 'deol' for Korean learners, and construction of Korean textbooks.

As communication technologies provide a new space for relationship formation, expansion and diversification of social ties, research has questioned whether on-line social ties can replace off-line ones in an organizational context. Yet, the role of on-line relationships in work groups still remains unclear, calling for empirical examination. By integrating social capital theory and social cognitive theory, we explore the different mechanisms of on-line social interaction ties that underlie an individual’s knowledgesharing through the comparative perspectives of collocated vs. dispersed teams. Given this purpose, we link social interaction ties with other facets of social capital and outcome expectation. Next, using social network analysis, we empirically test the proposed model with 186 individuals: 84 in collocated teams and 102 in dispersed teams. The study finds that the strength of on-line social interaction ties does not add value to collocated teams, while it plays a critical role in accumulating social capital and knowledge sharing by compensating for the lack of off-line social ties in the dispersed team.

In this paper, a stabilized-penalized collocated finite volume (SPCFV) scheme is developed and studied for the stationary generalized Navier-Stokes equations with mixed Dirichlet-traction boundary conditions modelling an incompressible biological fluid flow. This method is based on the lowest order approximation (piecewise constants) for both velocity and pressure unknowns. The stabilization-penalization is performed by adding discrete pressure terms to the approximate formulation. These simultaneously involve discrete jump pressures through the interior volume-boundaries and discrete pressures of volumes on the domain boundary. Stability, existence and uniqueness of discrete solutions are established. Moreover, a convergence analysis of the nonlinear solver is also provided. Numerical results from model tests are performed to demonstrate the stability, optimal convergence in the usual L² and discrete H¹ norms as well as robustness of the proposed scheme with respect to the choice of the given traction vector.

3차원 트러스 구조물을 설계대상으로, 구조계와 제어계의 동시최적설계문제에 대하여 고찰하였다. 구조 설계에대한 최소중량설계와 제어 설계에대한 외란 억제문제를 설계목적으로 고려하였다. 그리고, 본연구의 유용성을 입증하기위한 수치 시뮬레이션의 결과를 기술하였다.

This paper presents the development of a collocated capacitance sensor and its application to the controller design for magnetic bearing supported rotor systems. The main feature of the sensor is that it is made of a compact printed circuit board(PCB) so that it can be built into the actuator coil of the magnetic bearing unit. The singnal processing unit hax been also developed. The experi- mental results of the sensor performance evaluation on sensitivity, bandwidth and resolution are presented. Then, simulation study shows the advantages of the collocated sensor for magnetic bearings over the nonco- llocated sensor. Finally, the experimental result on the performance of the collocated sensor based contrl- ler for a magnetic bearing rotor system is presented.

판과 같은 구조물의 손상 감지를 위해, 손상 전 구조물의 임피던스 신호를 기저신호(Baseline impedance signal)로 이용하여 직접적으로 비교하지 않는 새로운 개념의 무기저 손상진단 기법(Reference-free impedance method)을 제시한다. 박막 압전소자(이하 PZT)를 판의 상하 표면에 부착시킨 한 쌍의 병치 PZT를 이용하여 손상으로 인해 모드변환을 일으키는 전기역학적 신호(Electro Mechanical Signatures ; 이하 EMS)를 추출한다. 이 연구에서는 스펙트럼 요소법(Spectral Element Method ; 이하 SEM)을 이용하여 주파수 영역에서 병치된 PZT의 EMS를 파악하기 위한 수치해석을 수행한다. 특히, 손상에 의해 발생된 모드변환 EMSMC를 병치된 PZT의 극성에 기인한 신호분해 기법을 적용하여 추출하고, 분해된 모드변환 EMSMC가 손상의 위치와 크기에 따라 받는 영향을 추가로 분석한다.

The design and performance verification of collocated capacitance sensor system for magnetic bearing is presented. Noncollocation between actuators and sensors may cause unstable rotor behavior. The capacitance sensor is not affected by magnetic field. PCB type capacitance sensor is installed between magnetic bearing polse. so, collocation of sensors and actuators can be achieved. Experiment of sensor's static and dynamic charactistics is conducted. Modeling of the rotor system supported by magnetic bearing is made. And performance comparison between simulation and experiment is showed.

최근 TV 디지털 방송에 대한 많은 관심이 집중되면서 국내의 디지털 텔레비전 방송(Digital Multimedia Broadcasting: DMB)과 유럽의 디지털 텔레비전 방송((Digital Video Broadcasting: DVB)에 대한 기술 개발이 지속적으로 이루어지고 있다. 국내의 DMB는 지상파 DMB와 위성 DMB가 있고, 유럽의 DVB는 일반 방송국으로부터 가정용 또는 사무실용의 고정된 장치에서 수신을 하는 DVB-T와, 휴대 전화기나 휴대용 영상기기 등의 저전력, 이동성, 휴대성을 고려한 DVB-H가 있다. 또한 휴대폰이나 PDA와 같은 휴대 통신단말기의 기능복합화 요구에 따라, 국내에서는 휴대폰에 TV 방송기능과 인터넷을 이용할 수 있는 네트워크 서비스가 내장된 단말기가 속속 출시되어 치열한 경쟁구도에 접어들고 있다. 이러한 시장요구에 부응하기 위해 다양한 분야에서 기능 복합화를 실현하고자 하는 " Ubiquitous Convergence화"가 급속도로 진행되고 있다. 그러나 단일 시스템에서 2가지 이상의 기능(GSM/GPRS & DVB-H)이 Convergence화 되어있을 경우, 시스템 상호간 간섭영향으로 각 장치의 기능 저하가 발생하고 있다. 특히, 동일 주파수대역 사용에 의해 방생하는 간섭영향에 대한 적절한 대응이 요구되는 시점이다. 본 고에서는 무선 통신 분야 기술개발의 한 부분으로 부품의 초소형화 및 동일 주파수대역 사용에 의해 발생하는 간섭영향을 제거하는 내용에 대해서 기술한다.

This study analyzes the use of collocated language units including collocation or collocate of symbolic adverbs based on written corpus of contemporary Korean. Furthermore, this study suggested how to apply this result of analysis into Korean language education. As part of this study, first, 145 symbolic adverbs were extracted from a corpus which contains about 22 million words in accordance with their frequency which is more than 100. Next, as the subjects of analysis, three symbolic adverbs were designated: ‘Jeomjeom’ which is the most frequent symbolic adverb, ‘Ping’ which is the 50th most frequent and ‘Ttobakttobak’ which was the 100th frequent. As a result, this study analyzes the collocated language units of those three symbolic adverbs in each register in corpus and concluded the aspect of language uses. To summarize the argument for Korean language education, first, it is more effective to deliver symbolic adverbs with appropriate combined form. Second, its semantic differences should be delivered using related information or visual materials. Lastly, the aspect of language use and meanings should be suggested according to morphologic change. On balance, designing textbook, teaching and learning ought to be achieved with these suggestions in Korean language education.

This paper describes a theoretical and experimental investigation into an active vibration isolation system in which four electromagnetic actuators are installed in parallel with each of four passive mounts placed between a piece of equipment and a vibrating base structure. Decentralised velocity feedback control is employed, where each actuator is operated independently by feeding back the absolute equipment velocity at the same location. Although one end of each actuator acts at the sensor positions on the equipment, the control system is not collocated because of the reactive forces acting on the flexible base structure, whose dynamics are strongly coupled with the mounted equipment. Isolation of low frequency vibration is considered where the equipment can be modelled as a rigid body and the mounts as lumped parameter springs and dampers. Control mechanisms are discussed, and some experimental and simulation results are reported.

This paper presents a theoretical and experimental study of a non-collocated pair of piezopolymer PVDF sensor and piezoceramic PZT actuator, which are bonded on a cantilever beam, in order to suppress unwanted vibration at the tip of the beam. The PZT actuator patch was bonded near the clamped part and the PVDF sensor, which was triangularly shaped, was bonded on the other part of the beam. This is because the triangular PVDF sensor is known that it can detect the tip velocity of a cantilever beam. Because the arrangement of the sensor and actuator pair is not collocated and overlapped each other, the pair can avoid so called 'the in-plane coupling'. The test beam is made of aluminum with the dimension of $200\times20\times2mm$, and the two PZT5H actuators are both $20\times20\times1mm$ and bonded on the beam out-of-phase, and the PVDF sensor is $178mm\times6mm\times52{\mu}m$. Before control, the sensor-actuator frequency response function is confirmed to have a nice phase response without accumulation in a reasonable frequency range of up to 5000 Hz. Both the DVFB and displacement feedback strategies made the error signal from the tip velocity (or displacement) sensor is transmitted to a power amplifier to operate the PZT actuator (secondary source). Both the control methods attenuate the magnitude of the first two resonances in the error spectrum of about 6-7 dB.