• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2001년도 추계학술대회논문집 II
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• pp.682-686
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• 2001

A fundamental structural design consideration for a vehicle is the overall vibration characteristics in bending and torsion. Vibration characteristics of a vehicle system are mainly influenced by dynamic stiffness of the vehicle body structure and material and physical properties of the components attached to the vehicle body structure. The first step in satisfying this requirement is to obtain a satisfactory dynamic model of the vehicle structure. In this paper. modeling techniques of the vehicle components are presented and the effects of the vehicle components on the vibration characteristics of the vehicle are investigated,

• Communications for Statistical Applications and Methods
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• 제28권3호
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• pp.281-294
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• 2021

In this paper, we propose an adaptive regression method based on the single-layer neural network structure. We adopt a symmetric activation function as units of the structure. The activation function has a flexibility of its form with a parametrization and has a localizing property that is useful to improve the quality of estimation. In order to provide a spatially adaptive estimator, we regularize coefficients of the activation functions via ℓ₁-penalization, through which the activation functions to be regarded as unnecessary are removed. In implementation, an efficient coordinate descent algorithm is applied for the proposed estimator. To obtain the stable results of estimation, we present an initialization scheme suited for our structure. Model selection procedure based on the Akaike information criterion is described. The simulation results show that the proposed estimator performs favorably in relation to existing methods and recovers the local structure of the underlying function based on the sample.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2008년도 추계학술대회논문집
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• pp.466-471
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• 2008

Structural vibration and noise are hot issues in underwater vehicles such as submarines for their survivability. Therefore, active vibration and noise control of submarine, which can be modeled as hull structure, have been conducted by the use of piezoelectric materials. Traditional piezoelectric materials are too brittle and not suitable to curved geometry such as hull structures. Therefore, advanced anisotropic piezoceramic actuator named as Macro-Fiber Composite (MFC), which can provide great flexibility, large induced strain and directional actuating force is adopted for this research. In this study, dynamic model of the smart hull structure is established and active vibration control performance of the smart hull structure is evaluated using optimally placed MFC. Actuating performance of MFC is evaluated by finite element analysis and dynamic modeling of the smart hull structure is derived by finite element method considering underwater condition. In order to suppress the vibration of hull structure, Linear-Quadratic-Gaussian (LQG) algorithm is adopted. After then active vibration control performance of the proposed smart hull structure is evaluated with computer simulation and experimental investigation in underwater. Structural vibration of the hull structure is decreased effectively by applying proper control voltages to the MFC actuators.

• 한국소음진동공학회논문집
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• 제19권2호
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• pp.138-145
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• 2009

Structural vibration and noise are hot issues in underwater vehicles such as submarines for their survivability. Therefore, active vibration and noise control of submarine, which can be modeled as hull structure, have been conducted by the use of piezoelectric materials. Traditional piezoelectric materials are too brittle and not suitable to curved geometry such as hull structures. Therefore, advanced anisotropic piezocomposite actuator named as Macro-Fiber Composite(MFC), which can provide great flexibility, large induced strain and directional actuating force is adopted for this research. In this study, dynamic model of the smart hull structure is established and active vibration control performance of the smart hull structure is evaluated using optimally placed MFC. Actuating performance of MFC is evaluated by finite element analysis and dynamic modeling of the smart hull structure is derived by finite element method considering underwater condition. In order to suppress the vibration of hull structure, Linear Quadratic Gaussian(LQG) algorithm is adopted. After then active vibration control performance of the proposed smart hull structure is evaluated with computer simulation and experimental investigation in underwater. Structural vibration of the hull structure is decreased effectively by applying proper control voltages to the MFC actuators.

• Bulletin of the Korean Chemical Society
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• 제28권12호
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• pp.2209-2213
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• 2007

Ginseng has long been used as a traditional medicine in Asian countries including Korea and China. In recent years, it has been reported that the biological activities of ginseng are due to its active components, ginsenosides. Ginsenosides are represented by triterpenes of the dammarane type. Ginsenoside Re consists of two glucose rings, one rhamnose ring, and the triterpene ring. In the present study ginsenoside Re has been isolated from the Korean ginseng (Panax ginseng) and the tertiary structure has been determined using NMR spectroscopy. Flexibilities around each linkages described by seven torsion angles were considered. The structures of ginsenoside Re obtained by NMR spectroscopy show the rigidity around the glucopyranosyl ring II and alkene side chain. The dihedral angles of φ5, φ6, φ7 are about 150o, 50o and 45o, respectively. In addition, flexibility exists around rhamnopyranosyl and glucopyronosyl moiety. The linkage around the rhamnopyranosyl and glucopyranosyl ring I, are divided into three groups. This flexibility seems to play important role in regulation of the hydrophobic surface exposed to the solvent. Because of the growing need for the structural determination of ginsenoside, this result can help to understand their well-accepted pharmacological effects of ginsenoside Re.

• 한국산학기술학회논문지
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• 제18권12호
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• pp.80-87
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• 2017

과거 미국은 낙후된 도심 지역을 되살리기 위한 도시재생의 도구로 대규모 도시개발사업을 진행하여왔고, 이를 통해 현재의 공공주도적 사업형태를 개발하였다. 특히 2008년의 경제위기이후 세계적으로 대규모 도시개발사업이 정체되거나 중단되었으나, 본 연구의 분석대상 사업인 미국 뉴욕시의 허드슨 야드 개발은 그 구조적 특성 및 합리적 협상과정을 통해 경제위기로 인한 어려움을 극복하고 현재 순조롭게 진행되고 있다. 그러나 이와 유사하게 경제상황에 좌우되는 국내 대부분의 개발은 민간주도로 이루어지고 있는 개발현실에서 노출되는 문제점을 반복하고 있으며, 그 대표적인 실패 사례가 용산국제 업무지구 개발이다. 이에 본 연구는 과거 용산국제업무지구 개발의 실패에서 노출된 주요 미비점을 중심으로 허드슨 야드 개발에서 나타나는 사업의 구조적 특성 및 협상과정상의 특성을 분석함으로, 위기를 극복할 수 있게 한 개발 사업의 구조적 유연성과 합리적 협상내용으로 부터 국내 참조가능한 시사점을 도출하고자 한다. 이를 통해 국내 대규모 도시개발의 계획시, 본 연구에서 도출된 다양하고 상이한 구조적 특징과 위기대처 방안의 시사점을 통하여 보다 합리적이고 위기상황에 유연한 개발로 계획함에 일조하고자 한다.

• 한국의상디자인학회지
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• 제17권4호
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• pp.77-90
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• 2015

This study is to designed to provide foundation for knit design which can apply the thickness and flexibility of jacquard knit by analyzing and comparing mechanical properties of 7 types of jacquard (normal jacquard, bird's eye jacquard, floating jacquard, tubular jacquard, ladder's back jacquard, blister jacquard, transfer jacquard) widely used in knit design to achieve the results. The sample was projected by using 7 gauge and SES-122S type computer knitting machine house tooth pattern with two colors were applied to 7 types of jacquard using Acrylic/Wool(30%/70%) $2/50.5^{\prime}s{\times}4ply\;yarn$ by Shimaseiki MFG., Ltd computer knitting machine. The mechanical properties of 7 types of jacquard samples were measured using KES-FB (Kawabata Evaluation System for Fabric, Kata Tech Co. Ltd). HV(Hand Value) and THV (Total Hand Value) were calculated by using the formula of KN-402-KT and KN-301-WINTER respectively. The measurements were evaluated by 0-to-5 rating scale. As result, the floating jacquard was found to have excellent drape, making it suitable for express feminine silhouette with its most flexible and smooth touch. On the other hand, bird's eye jacquard is adequate for a suit jacket and coat regarding its excellent volume and flexibility. Blister jacquard and tubular jacquard are thick, heavy and stiff knit and both are suitable for simple box-style design. Ladder's back jacquard, however, is more appropriate for expressing the design of feminine charm and voluminous design. Based on the result of this study, it is supposed to provide basic information for development of knit industry regarding jacquard knit by designing the creative knit wear with high production efficiency.

• 디자인학연구
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• 제15권3호
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• pp.191-200
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• 2002

이탈리아는 1980년대에 경제적 공항기를 맞이하였으나 국민적인 단합과 디자인을 통한 산업의 발전적 도약을 이루어 세계적인 디자인 강국이 되었다. 특히 이탈리아는 Clusters System이라는 단계별 구조 속에서 중소기업들이 각 지역에서 동 업종에 의해 집적되어있고, 유연성, 상상력, 과단성이 있는 중소기업의 탄력적인 경영 방식, 가족 경영, 컨소시엄의 발전 등이 특징이다. 이러한 이탈리아의 디자인 경쟁력 강화 요인들을 도입하여 우리나라의 디자인 산업의 경쟁력을 강화시킬 수 있는 방안을 연구하였다. 우리나라는 장인정신, 혈연중시, 지역특성을 지니고 있으므로 지역의 특산품과 전통공예품 등을 상품화하여 세계화시킬 수 있고, 생산과정의 전문화된 구조와 중소기업간의 컨소시엄으로 경제적 효율을 높일 수 있고, 소비자와 생산자를 긴밀하게 연결시켜 시장에서 경쟁력을 키운다면 우리나라도 디자인 강국이 될 수 있다.

• 전기전자학회논문지
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• 제13권2호
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• pp.101-107
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• 2009

집적회로의 공정기술 및 설계기술이 발전함에 따라 많은 IP가 하나의 반도체 칩에 집적되어 하나의 시스템을 구성하는 SoC 설계가 많이 이루어지고 있다. 본 논문에서는 다양한 IP 간에 효율적인 데이터 통신이 이루어지도록 버스 상의 전송 특성에 따라 버스모드를 동적으로 재구성하는 SoC 3중 버스 구조를 제안한다. 제안된 버스는 다중-단일버스 모드, 단일-다중버스 모드로 재구성이 가능하며 따라서 단일버스 모드와 다중버스 모드의 장점을 모두 갖는다. 실험결과 제안된 버스구조는 기존의 고정된 버스구조보다 독립적이며 데이터 전송시간을 단축시킬 수 있음을 확인하였다. 그리고 제안된 버스구조를 JPEG 시스템에 적용한 결과 다중버스구조보다 평균 22%의 전송시간 단축을 얻을 수 있었다.

• 한국공간구조학회논문집
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• 제18권1호
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• pp.55-65
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• 2018

In order to reduce the seismic response of the spatial structure, a seismic isolation system with sufficient flexibility is used. The natural period of structure with seismic isolation system got be long to avoid prominent period. In this study, The seismic response of the truss-arch structure, which is modeled in three types according to the rise-span ratio is analyzed on El-centro, Northridge and Artificial Earthquake and compared with the seismic response of the truss-arch structure with lead rubber bearing(LRB). When seismic load is applied to the truss arch with isolation system, the horizontal acceleration response of the truss arch is reduced and vertical seismic response is also reduced. The application of the seismic isolation system is effective in controlling the seismic response.