• Journal of KSNVE
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• v.7 no.2
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• pp.261-272
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• 1997

Recently washing machines are to be in lower vibration and lower sound because of better environment. Vibration problems in washing machines occur in both washing mode and spinning mode, but vibration in spinning mode becomes main problem because of its high rotating speed and continuity. Vibration while spinning is mainly due to rigid body motion of total washing system which includes suspending rods, washing bath, spinning bath, and gear sets. In this study, some researches were done in order to analyze the rigid body motion of washing system and flexible vibration of spinning bath. A basic mathematical model was established, and the effect of position of salt water and shape change of salt water case were considered. And the effect of lengths of suspending rods, attaching angles, vertical and horizontal position, stiffness of spring on the change of vibration were also considered. To identify the effect of salt water on vibration, some measurements were done. When salt water was positioned at upper part, the effect was most and this coincides with the tendency of simulation.

• The Research Journal of the Costume Culture
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• v.8 no.1
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• pp.115-122
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• 2000

There are many battle paintings among wall paintings in Kokuryeo. Most warriors in paintings wore armours in full kit. Armours in Three-Kingdom Period were contrived for strategy. They have been checked that Pangab suitable for infantry action had been worn in Shilla while flexible Chalgab for cavalry battle had been worn in Kokuryeo. As cavalry strategy in Kokuryeo was brought to Kaya Kingdom via battles in fifth century, Chalgab became also worn in South area. Pangab, Shaejagab and Nubigabot as well as Chalgab had also been worn on view of wall paintings. There were many kinds of helmets such as Jongjang-panju, Mangokjongjang-panju, Kwanmonhyoungbok-balju, Chongkakju and Kwaehyoungju. Accesory-Armours are Sanggab, Kyounggab, Sangbakgab, Gwinggab, Daetwaegab and Kyounggab. Those helmets and Accesory-Armours are quite similiar to excavations from Shilla, Kaya Kingdom area. As Kokuryeo wall paintings are related to excavations from South area, armours and helmets in those wall paintings can be a good data to investigate the full shape of excavations and how to use, while excavations are very useful to the study on method of construction and manufacturing of armours and helmets.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2001.04a
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• pp.325-332
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• 2001

Due to the rapidly developing computer technique, bridges can be modeled by using grillage method for analyzing the girder, or FEM for more accrute and detailed analysis. If the cells of multicellular decks are stiffened with diaphrams or cross-bracing at frequent intervals, to prevent them changing shape by distortion, the deck can be analysed like a beam if it is narrow, or like slab if it is wide. However it is often convenient and acceptable to use cellular structures and box-girders which do distort under shear and torsional loading, and it is then necessary to take account of the distortion in the method of calculation. But plane grillage method cannot cosider effect of distortion and FEM is non-economical because it is not easy to modeling and needs lots of time. So, this study suggests the Shear-flexible Grillage which reproduces the distortion behaviour of the cells.

• Journal of the Korean Home Economics Association
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• v.38 no.10
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• pp.133-142
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• 2000

The subjective hand and preference of enzyme hydrolyzed denim fabrics were evaluated using the scale developed. The factors affecting consumer's taste for polyester fabrics were analyzed by the statistical technique. The effects of alkaline hydrolysis on the properties of polyester fabrics were evaluated by subjective and objective hand measurements. The lower the age of evaluators, the more sensitive their feeling. As the age decreased, evaluators felt fabrics become flossy and soft surface property is smooth, flexible, warm, refined. They didn't catch the sense of durability, moisture related property and sense of shape recovery. The lower the age, the fabric was more preferred. Women were more sensitive and consistent than men.

• Proceedings of the KIEE Conference
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• 1998.07g
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• pp.2521-2523
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• 1998

Freestanding flexible microstructures fabricated from deposited thin films become mechanically unstable when internal stresses exceed critical values. The residual stress and stress gradient of aluminum thin film were examined to make sure of fabricating the reproduceable aluminium structure. For good shape of micro mirror array and microstructures, the experiment was done varying thickness and deposition rate. As the aluminium film thickness increased from 0.8${\mu}m$ to 1.6${\mu}m$, the stress gradient decreased from 11.62MPa/${\mu}m$ to 2.62MPa/${\mu}m$. The residual stress values are from 42.4MPa to 62.24MPa of tensile stresses.

• Proceedings of the Korean Institute of Interior Design Conference
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• 2004.11a
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• pp.191-192
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• 2004

This is on-going project planned from June to August, 2003 for the development of sub-urban housing of 108 buildings on 30,000 pyung lot located in Dochuk-myun, Kwangju-si, Kyunggi-do. The Site is consist of 10 different building sizes ranging from 45pyung to 65pyung on 180 to 220pyung lot. Buyers can customize their types and functions based on given sizes. Most sub-urban housing until now was based on typical planning and had no regard for its characteristics of diverse location. To solve these problems, I designed each types according to its locational characteristics and gave each lot flexible shape to have identities. To take advantage of its undulation, I put playground and sports facilities like swimming pool and tennis court at the approach. Central square to the center and park and observatory to the top

• Proceedings of the KIEE Conference
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• 1998.07g
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• pp.2370-2372
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• 1998

Recently we have developed an active stereo head-eye system with vergence, name it KIST HECter(Head-Eye System with Colored Stero Vision), based on the analysis of human's neck and eye motion at visual behavior. Our HECter is a five degree-of-freedom system composed of pan and tilt motion in neck part and independent vergence motion of binocular cameras and commonly shared elevation axis in eye part. And stereo vision Provides two color image, which are processed by powerful each TMS32080 vision board. The shape and size are designed to be almost same as human face. The ability to vergence has significant importance and gives many beneficial merits. On its mechanical implementation we adapt a non-parallelogram 4-bar linkage mechanism since it provides high accuracy in transfering motion and enables compact and flexible design.

• Journal of the Microelectronics and Packaging Society
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• v.26 no.4
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• pp.15-22
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• 2019

Metallic nanowires (MNWs) have recently been considered as one of the most promising candidates for flexible electrodes of advanced electronics including wearable devices, electronic skins, and soft robotics, since they have high aspect ratio in physical shape, low percolation threshold, high ductility and optical transparency. Herein, we review the latest findings related to the MNWs and discuss the properties and potentials of this material that can be used in implementation of various advanced electronic devices.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2010.04a
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• pp.192-195
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• 2010

본 논문에서는 해상 크레인과 중량물의 동적 거동을 시뮬레이션하기 위해, 유한 요소 정식화(finite element formulation)를 이용하여 해상 크레인의 붐(boom)을 탄성체로 모델링 하였다. 붐은 3차원 탄성 빔(beam) 요소로 가정하고, 각 요소의 변형에 의한 변위는 형상 함수(shape function)과 절점 좌표(nodal coordinate)를 이용하여 정의하였다. 변형 변위를 이용하여 탄성 붐의 강성 행렬(stiffnes matrix)을 유도하고, 탄성 변위를 포함하는 위치 벡터를 이용하여 질량 행렬을 유도한다. 해상 크레인과 중량물로 이루어진 운동 방정식에 탄성 붐을 포함하여 유연 다물체계(flexible multibody system) 운동 방정식을 구성한다. 외력으로는 선박 유체정역학적 힘, 유체동역학적 힘, wire rope의 장력, 중력 그리고 계류력(mooring force)이 고려되었다. 먼저 요소의 개수를 변경하며 탄성 붐의 동적 거동을 시뮬레이션 하여, 유한 요소 정식화를 이용한 모델링의 타당성을 검증하였다. 그리고 해상 크레인과 중량물의 동적 거동 시뮬레이션에 탄성 붐 모델을 적용하였다.

• Journal of the Korean Society for Precision Engineering
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• v.21 no.9
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• pp.95-102
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• 2004

A flexible incremental roll forming process has been developed by adopting the advantages of the incremental forming process and the roll forming process: i.e., inherent flexibility of the incremental forming process and continuous bending deformation of the roll forming process. It has an adjustable roll set as a forming tool composed of one upper center roll and two pairs of lower support rolls, which plays a key role during forming process. Through the experiments based on the various combinations of process parameters, it is shown that the incremental roll forming process is so effective as to manufacture various doubly curved sheet metals including concave-convex combination shapes in which there exists a line of inflection. The proposed relationship of the experimental parameters and the radius of curvature of the formed sheet boundary is found to be useful in prediction and control of the final shape.