• The Korean Journal of Cytopathology
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• v.15 no.1
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• pp.65-69
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• 2004

Epithelioid sarcoma is a malignant soft tissue neoplasm with an uncertain histogenesis. We report the imprint cytologic features of epithelioid sarcoma in the left shoulder of a 29-year-old male patient. Imprint cytologic findings showed dissociated and loose aggregates of anaplastic epithelioid cells on the necrotic, bloody, and inflammatory background. Tumor cells were round to polygonal shaped. Tumor cells had vesicular nuclei with abundant cytoplasm. The nuclei were irregular in shape and often eccentrically located. Some tumor cells were oval to spindle shaped. Binucleated and multinucleated cells were found. Intracytoplasmic vacuoles were present. On immunohistochemical stain, the tumor cells were positive for epithelial membrane antigen, vimentin, and CD34.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2005.06a
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• pp.676-679
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• 2005

Nano imprint Lithography (NIL) is regarded as one of the next-generation lithography technologies with EUV lithography, immersion lithography, Laser interference lithography. Because a Si wafer stamp and a quartz stamp, used to imprinting usually are very expensive and easily broken, it is suggested that master stamp is duplicated by PDMS and the PDMS stamp uses to imprint .For using the PDMS stamp, a thermally curable monomer resin was used for the imprinting process to lower pressure and temperature. As a result, NIL patterns were successfully fabricated.

• The Korean Journal of Cytopathology
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• v.19 no.1
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• pp.57-64
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• 2008

Giant cell tumor of the tendon sheath (GCTTS) is a slowly growing, benign soft tissue tumor. The tumors occur predominantly on the hands and feet. Although the clinical and histopathologic features are well-defined, only a few reports have described the cytologic appearance of this entity. A 26-year-old woman presented with a gradually developing circumscribed soft tissue mass near the proximal phalanx of her left little finger for one year. Imprint and fine needle aspiration (FNA) smears were obtained from the excisional biopsy specimen. The imprint smears were composed of predominantly singly dispersed bland mononuclear cells and several giant cells. The mononuclear cells were polygonal to round, and they showed a histiocyte-like appearance. Osteoclast-type multinucleated giant cells of various sizes were randomly scattered throughout the smears, and these cells contained 3 to 50 nuclei. Nuclear atypia and pleomorphism were absent in both the single and giant cells. Loose aggregates of hemosiderin-laden macrophages and binuclear stromal cells were also seen. The cytologic features of the FNA smears were similar with those of the imprint, Additionally, the FNA smears contained several clumps of densely collagenous stromal tissue that were seldom noted in previously reported cytologic material. The cytologic features were well-correlated with the concurrent histologic findings and the diagnosis of GCTTS was made. When the clinical and radiologic datas are integrated, the diagnosis of GCTTS can be strongly suggested, based on the pre-operative cytologic specimen.

• The Korean Journal of Cytopathology
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• v.18 no.2
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• pp.170-174
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• 2007

Granular cell tumor is a rare tumor of the soft tissue and this is characterized by proliferation of large cells with granular appearing eosinophilic cytoplasm. We report the imprint cytologic features of a case of granular cell tumor in the left calf of a 52-year-old woman. Microscopic examination showed moderate cellularity. The tumor cells were arranged both as single cells and in clusters. The cells were large polygonal-shaped and they had small round nuclei with finely granular chromatin and occasionally conspicuous nucleoli. The cytoplasm was abundant eosinophilic and granular. Naked nuclei and spindle-shaped tumor cells were occasionally noted. No mitosis and necrosis were present. The background showed cytoplasmic granular materials. The tumor cells showed positivity for S-100 protein. Ultrastructurally, abundant lysosomes were present in the cytoplasm of the tumor cells.

• The Korean Journal of Cytopathology
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• v.11 no.1
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• pp.59-63
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• 2000

Extraskeletal osteosarcoma is an uncommon tumor originated from soft tissue without evidence of skeletal involvement. It usually affects adults and its common locations are extremity, buttock, and retroperitoneum. Although the histologic feature of this tumor is well known, there have been few reports on the fine needle aspiration cytologic findings. We report the imprint cytologic feature of extraskeletal osteosarcoma. The patient was a 49-year-old man with a mass of the left anterior chest for 2 years. On the Imprint preparation, the smears showed malignant round, polygonal or spindle cells with coarsely clumped chromatin and occasionally prominent nucleoli. The malignant cells occur singly, in clusters, or associated with amorphous eosinophilic osteoid. Mitotic figures are also seen.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2013.05a
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• pp.633-634
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• 2013

• Proceedings of the Korean Geotechical Society Conference
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• 1992.10a
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• pp.137-144
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• 1992

This paper reports a case study of dynamic consolidation. The objective of the study is to evaluate the effectiveness of ground improvement at the site for Hyundai Petrochemical Compound constructed at Daesan-Myeon, Seosan-Gun in the western shores of Korea. The site ground was prepared by filling on the existing soft marine deposit which consists of a loose granular soil layer and a medium stiff clay layer. For the stabilization of site ground, the compaction was executed in three different procedures with same pounder weigh, drop height and imprint spacing. The post investigation showed that the object was successfully achieved indicating a significant increase of bearing capacity of the treated ground. In this study the effectiveness of dynamic consolidation is evluated for various factors the applied energy, temping sequences, the radial distance from the imprint location and the depth of bed rock.

• Bulletin of the Korean Chemical Society
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• v.33 no.1
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• pp.83-89
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• 2012

Due to the potential importance and usefulness, usage of highly ordered nanoporous anodized aluminum oxide can be broadened in industry, when highly ordered anodized aluminum oxide can be placed on a substrate with controlled thickness. Here we report a facile route to highly ordered nanoporous alumina with the thickness of hundreds-of-nanometer on a silicon wafer substrate. Hexagonally or tetragonally ordered nanoporous alumina could be prepared by way of thermal imprinting, dry etching, and anodization. Adoption of reusable polymer soft molds enabled the control of the thickness of the highly ordered porous alumina. It also increased reproducibility of imprinting process and reduced the expense for mold production and pattern generation. As nanoporous alumina templates are mechanically and thermally stable, we expect that the simple and costeffective fabrication through our method would be highly applicable in electronics industry.

• Journal of the Microelectronics and Packaging Society
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• v.21 no.2
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• pp.85-89
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• 2014

We propose the new fabrication method of a 70 nm half-pitch wire grid polarizer with high performance using magnetic soft mold. The device is a form of aluminium gratings on a PET(Polyethylene phthalate) substrate whose size of $3cm{\times}3cm$ is compatible with a TFT_LCD(Tin Flat Transistor Liquid Crystal Display) panel. A magnetic soft mold with a pitch of 70 nm is fabricated using two-step replication method. As a result, we get a NWGP pattern which has 70.39 nm line width, 64.76 nm depth, 140.78 nm pitch, on substrate. The maximum and minimum transmittances of the NWGP at 800 nm are 75% and 10%, respectively. This work demonstrates a unique cost-effective solution for nanopatterning requirements in consumer electronics components.

• Proceedings of the Korean Vacuum Society Conference
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• 2014.02a
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• pp.390-390
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• 2014

Soft-lithography 기술 중의 하나인 Micro-Contact Printing (${\mu}$-CP) 기술은 패턴이 형성된 mold 위에 고분자 물질을 코팅하고 기판과 접촉시켜, 패턴 된 부분만 기판으로 전사시켜 패턴을 형성하는 방법이다. ${\mu}$-CP 기술은 Imprint 방식과 비교하여 잔여물을 제거하기 위한 ashing 공정이 필요 없으며, 상대적으로 패턴이 전사되기 위한 공정 온도와 압력이 낮은 장점이 있다. 한편, 기존의 Photolithography 기술로 유기기판에 패턴을 형성하는 것은 제한이 있으며, 자외선에 의해 유기기판의 특성이 변화될 수 있다. 또한 패턴 형성 후 고분자 패턴을 제거하는 용매가 기판이 손상 받게 된다. 본 실험에서는 poly (1H,1H,2H,2H-perfluorodecyl methacrylate) polymer (PFDMA) films을 패턴 된 poly (dimethylsiloxane) (PDMS) mold 위에 코팅하고 ${\mu}$-CP 기술을 통해 poly (methylmethacrylate) (PMMA), poly (vinyl pyrrolidone) (PVP)등과 같은 유기기판 위에 고분자 패턴 형성을 하였다. 이때 전사 가능한 온도는 상온이며, 압력은 코팅된 PFDMA films이 기판과 접촉될 수 있는 정도만 필요하다. PFDMA가 상온에서 전사 가능한 이유는 유리전이온도가 상온보다 낮기 때문이다. 또한 접촉각을 측정하여 접착력을 계산하면 PFDMA와 기판과의 접착력이 상대적으로 높기 때문이다. PFDMA는 플루오르계 용매에 제거되기 때문에 유기기판의 손상을 최소화 할 수 있다. ${\mu}$-CP 기술을 이용한 PFDMA의 패턴 형성 방법은 물질의 특성으로 flexible 및 organic device 제작에 응용 될 수 있다.