• 대한토목학회논문집
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• 제32권6A호
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• pp.419-426
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• 2012

굳지않은 콘크리트에는 항상 일정량의 잉여수가 발생하게 된다. 이러한 잉여수는 콘크리트 내부에서 갇힌공기로 남게 되어 내구성을 저하시키는 요인이 되므로 잉여수를 제거할 수 있다면 구조물의 내구성 향상에 큰 도움이 될 것이다. 기존에 많은 연구가 있었지만 투수시트의 특성에 대한 상세한 검토는 부족한 상태이며, 거푸집의 천공에 따른 시공성 저하는 여전히 의문이 있다. 따라서, 본 논문에서는 투수거푸집 시스템에서 직포 및 부직포 투수시트를 적용할 경우의 기초적인 특성을 실험을 통하여 검토하고 시공성 향상을 위해 거푸집에 천공을 하지 않는 투수거푸집에 대한 연구를 진행하였다. 그 결과 투수거푸집에서 직포와 부직포 투수시트를 사용한 경우 직포의 조밀성 및 부직포의 두께 등에 따라 일부 차이가 있었지만 W/C 감소, 표면 평탄성 증가, 표면부 강도 향상이 있었으며, 시멘트손실은 미미하여 적용성이 우수한 것으로 나타났다. 또한, 투수시트 내부에 탈수된 잉여수의 배수통로를 가지고 있는 배수 부직포 투수시트를 적용한 경우 거푸집에 천공을 하지 않고서도 필요한 탈수성능을 발휘할 수 있어 시공성 향상에 기여할 것으로 판단된다.

• 복식
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• 제52권8호
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• pp.109-122
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• 2002

This study is to understand cotton Tyeollik construction of the middle Chosun Period through the reconstruction of tyeoilik which was excavated from lady kim's tomb (from sooncheon). The form of excavated Tyeollik classified into two types by the location of waistline. The structure of excavated tyeollik classified into three types by the construction(one-layer, two-layer, cotton/quilt) The form type change according to the period. The change of the form type has the close relation structure type in the tyeollik. Cotton-tyeollik belongs to the form of the front time. The construction of cotton tyeollik is similar with the one-layer Tyeollik Exception the construction of git(collar) and the size and direction of the fold. The surface pattern is composed of two-pieces but the liner is one-piece in the Git(collar). and In The size of fold surface is o.2-o.3cm, and liner is 0.5-0.8cm. The direction of fold in the liner is the contrast with the surface.

• Journal of Advanced Marine Engineering and Technology
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• 제29권6호
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• pp.671-677
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• 2005

In internal combustion engines the usual material for the cylinder liner is because of its good wear resistance Apparently this wear resistance arises from the at iron to form a hard glazed surface when under sliding friction. When the cylinder liner wear limits, it shall be replace with new one according to the classification soci manufacturer's standards. However, adoption of alternative repairing method such a metalizing, thermo plastic deformation process became inevitable taking enormous cost renewal into consideration. In this paper. the material properties of cylinder liner of grey discussed on the basis of the results of experimental work of the thermo plastic deformation the worn out cylinder liner made of grey cast iron.

• 대한조선학회지
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• 제8권2호
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• pp.45-52
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• 1971

The object of this study is to determine theoretical ship form which minimises wave making resistance under given conditions and developes theoretical ship form planing. By employing the streamline tracing method 1967's Korean Standard Ship Form of 10,000 G.T. linear has been reformed and tested at towing tank of Inha Institute of Technology. The design process and the reformed ship forms had been reported already in reference[4]. In this paper, resistance performance is experimentally observed with three models(original, theoretical, and reformed form) of 2m long in the towing tank, and total resistance of theoretical and reformed ship forms are decreased by 24.9% and 19.7% and wave making resistance by 66.4% and 47.7% compare to original ship form respectively.

• 한국항해항만학회지
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• 제26권4호
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• pp.391-398
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• 2002

전략적 제휴는 기업의 경쟁우위를 확보하기 위한 중요한 경영전략으로 이용되며 많은 기업들이 경쟁기업과 다양한 형태의 제휴를 맺고 있다. 본 연구에서는 정기선해운에서 제휴유형간의 만족도에 차이가 있는지, 제휴유형별 성공요인의 중요도에 차이가 있는지, 제휴 유형간 성공요인의 중요도에 차이가 있는지 등에 대하여 실증분석을 하였다. 연구의 곁과 정기선사들은 제휴의 성과에 대하여 대체로 만족하고 있으며 제휴의 성공여부는 다양한 요인에 의하여 결정되며, 제휴의 유형에 따라 성공요인의 중요도에 차이가 있는 것으로 나타났다.

• 대한조선학회지
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• 제7권2호
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• pp.41-60
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• 1970

Despite it's limitations, the existing Stream Line Tracing Method(Inverse Method) can be applied effectively to the design of better hull forms with practical proportions. Most of the calculating mechanism by the method for hull form design has been achieved. In this paper, authors have tried to improve the quality of wave making resistance on the 10,000GT liner among FY'67 Korean Standard Ship Form. Some numerical results obtained in this work and designed new lines are shown.

• 수산해양기술연구
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• 제33권4호
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• pp.259-265
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• 1997

The new concept of hull form for G/T 19 ton class off-shore long liner was studied with the support of special research fund of Korean Ministry of Science and Technology. Newly developed hull form of semi-twin afterbody combined with part. curvilinear type forebody shows outstanding improvement in resistance performance point of view compared with hard chine form, especially at the range of high speed.

• Geomechanics and Engineering
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• 제20권5호
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• pp.399-410
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• 2020

Cavities often develop behind the vault during the construction of double-arch tunnels, generally in the form of various defects. The study evaluates the impact of cavities behind the vault on the mechanical and failure behaviors of double-arch tunnels. Cavities of the same sizes are introduced at the vault and the shoulder close to the central wall of double-arch tunnels. Physical model tests are performed to investigate the liner stress variation, the earth pressure distribution and the process of progressive failure. Results reveal that the presence of cavities behind the liner causes the re-distribution of the earth pressure and induces stress concentration near the boundaries of cavities, which results in the bending moments in the liner inside the cavity to reverse sign from compression to tension. The liner near the invert becomes the weak region and stress concentration points are created in the outer fiber of the liner at the bottom of the sidewall and central wall. It is suggested that grouting into the foundation soils and backfilling injection should be carried out to ensure the tunnel safety. Changes in the location of cavities significantly impact the failure pattern of the liner close to the vault, e.g., cracks appear in the outer fiber of the liner inside the cavity when a cavity is located at the shoulder close to the central wall, which is different from the case that the cavity locates at the vault, whereas changes in the location of cavities have a little influence on the liner at the bottom of the double-arch tunnels.

• 한국디지털건축인테리어학회논문집
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• 제5권1호
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• pp.17-23
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• 2005

To begin with, this research arranged this concepts by analyzing paper a reference paper. So, the theory was arranged by approaching the ideal, formative and contemporary side. In order to type characteristics expression of organic design, after year 2000 printed in "Interiors" journal analyzed the contents based on interior works. 1. A type of metaphorical expression, order and the imitations of animals and plants. 2. A type of non liner, and dynamical balance and irregularity. 3. A type of mass of indeterminate form. 4. A type of fluidity by a curved line and a curved surface.

• International Journal of Internet, Broadcasting and Communication
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• 제12권3호
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• pp.74-86
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• 2020

This study discussesresearch and development of large-sized 3D printers that can be applied to construction and civil engineering for various designs of protective casing on foam liner for concrete exteriors. The consistent use of concrete represents the current surroundings. However, concrete exteriors in Korea have not considered the regional characteristics, but the concrete has been poured solely for economical aspects for the last decade or two. There are many cases of poor installation and not enough design development projects to correct it. This study was conducted to apply various patterns, regional characteristics, and 3D printing for protective casing design for foam liner to create various designs for the concrete walls. Therefore, we started researching on a large 3D printer, and designed and developed this system. Considering the chronological process, the properties of concrete structures were identified, the application of designs for concrete in Korea and abroad and the 3D printing materials for the protective casing were surveyed and analyzed, and a stereotype was produced in the first year to study designs for the beauty of concrete surfaces. In the second year, images of regional characteristics were gathered, design ideas for regional promotion were derived, virtual images were produced along with design modeling to simulate the appearances, and verify the effect of application and promotion. Finally, in the third year, the 3D printer for concrete foam liner was constantly improved to analyze the 3D printing program and the various library elements to complete an actual large-sized 3D printer.