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최주현,이종현 진주산업대학교 산업과학기술연구소 2007 산업과학기술연구소보 Vol.- No.14
DTP(Digital Textile Printing) is the next generation printing system which reduce the manufacturing process by managing all of the process from design to print with the computer. Furthermore, this system is easy to transform the various original to the other. Only ten years ago, the application of the DTP(Digital Textile Printing) has been limited because of the various obstacles to clear. But, recently this system is being watched as the next generation printing system with the sharp development of a related technology. Therefore, the introduction of DTP is an alternative plan to be able to boost the textile business to a higher vale-added business. Design research of the textile cultural product is the field to study with a new method and a new technology by using Digital Textile Printing and Computer Graphic Process; for example, a new design development and a working method finding, etc. Therefore, in this research, we would like to find the meaning of the development and the possibility of textile cultural product by applying DTP(Digital Textile Printing)to the cultural product.
35Cr-45Ni 오스테나이트계 내열강의 침탄가속시험을 통한 침탄거동과 기계적 특성
최주현,정수민,김근수,김원석,정우진 대한용접·접합학회 2021 대한용접학회 특별강연 및 학술발표대회 개요집 Vol.2021 No.11
석유화학은 자동차, 타이어, 화장품, 섬유, 세제, 전기, 전자, 건설 등 우리의 일상 속 수 많은 제품 제조에 사용되는 기초 소재를 공급할 뿐만 아니라 생명공학, 항공우주 등 산업에 필요한 첨단 소재를 공급하고 있는 중요 산업이다. 또한 원료의 10~100배 이상 고부가가치를 창출 할 수 있는 산업이며, 자본 집약적 장치산업이라는 특징이 있는데, 그 핵심 기반 설비가 나프타/에탄 크래커 (Naphtha/Ethan Cracking Center, NCC/ECC)이다. 석유화학에서 사용되는 NCC/ECC 원심주조 부품은 나프타 및 에탄 분해를 위해 이러한 고온 유체가 흐르는 통로가 되며, 일반적으로 약 1,000℃ 이상의 가혹한 환경에서 사용되고 있다. 부품 내부에 흐르는 유체에서 나프타, 에탄 등에 함유된 탄화수소 입자들은 높은 온도로 인하여 내부 표면과 반응하여 점차 두꺼운 코킹 층을 형성하게 되며 고온으로 인한 열화 등으로 변형, 균열 등 손상이 발생하여 부품 교체주기가 짧은 문제점이 있다. 본 연구에서는 원심주조 내열합금강의 고온 탄화수소(CH4) 분위기에서 시간의 변화에 따른 침탄과정을 파악하기 위해, EPMA 분석을 통하여 탄소 함유량을 비교하며, 기계적 특성 평가를 통해 침탄 조건에 따른 재료의 물성 변화를 검토하였다.
카메라 렌즈용 광학 유리 소재 핵심 특성과 기술개발 현황
최주현,남윤희,한가람 한국세라믹학회 2022 세라미스트 Vol.25 No.3
For core imaging technologies, various R&D for optical lens design have been carried out to realize high- resolution images without distortion. The need for systematic analysis of the optical and physical properties of various materials and the correlation for optical lens design has increased. Therefore, core characteristics of visible optical glass material such as refractive index, dispersion value, transmittance, coefficient of thermal expansion, and striae were reviewed from the viewpoint of improving the performance of optical lenses. In this study, the correlation between the refractive index and dispersion value of the optical glass material and the performance of optical lens module is explained by minimizing the chromatic aberration of various wavelength. In addition, we reviewed the refractive index distribution of global leading group's optical glass, which is the most widely used in optical lens manufacturing, and the current status of optical glass technology development at KOPTI.
최주현,이우제,정윤희,박혜원,이단비,원종철,김덕재,김기수 대한내분비학회 2006 Endocrinology and metabolism Vol.21 No.3
Two of the common causes of hypercalcemia are malignancy and primary hyperparathyroidism. These disorders are easily diagnosed by the clinical manifestations and measurement of the serum intact parathyroid hormone (PTH) level. On the other hand, hyperthyroidism is an uncommon cause of hypercalcemia. The diagnosis of hypercalcemia associated with hyperthyroidism can only be made by excluding the common causes of hypercalcemia and by observing the improvement of the hypercalcemia and its associated symptoms with normalizing the thyroid function. Herein we reported our experience with a 67 year-old woman who presented with nausea and vomiting. She showed elevated serum calcium and phosphorus levels. Serum intact PTH level was 1.1 pg/mL (normal range; 10~65). The results of the thyroid function test were compatible with hyperthyroidism. After resolution of the thyrotoxicosis with combination treatment of methimazol and Lugol's solution, the patient's serum calcium and phosphorus levels were normalized and the symptoms were improved. (J Kor Soc Endocrinol 21:251~256, 2006) 갑상선기능항진증의 가장 흔한 원인으로는 악성종양과 일차성 부갑상선기능항진증을 들 수 있으며, 이들 질환은 임상양상과 혈중 intact PTH 측정을 통해 진단할 수 있다. 반면, 갑상선기능항진증은 고칼슘혈증의 드문 원인 중의 하나로, 갑상선기능항진증에 의한 고칼슘혈증은 대부분의 경우 임상양상이 경미하며 고칼슘혈증의 흔한 원인들을 배제한 후 갑상선 기능이 정상화되면서 고칼슘혈증이 호전되는 것으로 진단이 가능하다. 저자들은 오심과 구토 증상으로 내원한 67세 여자환자에서 갑상선기능항진증과 동반된 고칼슘혈증을 관찰하였고, 항갑상선제와 루골용액, propranolol을 병용하여 갑상선기능을 정상화 시킨 후 환자의 증상 및 칼슘 수치가 정상화된 증례를 경험하였기에 문헌고찰과 함께 보고하는 바이다.
Optimum Mixing Ratio of Growing Media and Soil for Water Maintenance in Pot Culture
최주현,하시영,정지영,남정빈,김지수,양재경 경상대학교 농업생명과학연구원 2016 농업생명과학연구 Vol.50 No.6
The efficacy of the natural amendments in improving physical condition as well as waterretention characteristics of the growing media in pot culture was studied on seven different mixratio of growing media applied to soil. Growing media was prepared from peat, perlite, pruningwaste, pulp(3:1:3:3(w/w/w/w)). Growth substrates were prepared by mixing growing media at therates of 0%, 10%, 20%, 30%, 40%, 50% and 100% with soil at 100%, 90%, 80%, 70%, 60%,50% and 0%, respectively. The bulk density tended to decreased with increasing growing mediaproportions. The particle density was lowest(0.6 g/cm3) in sole growing media treatment and theporosity of all the soil mixed growing media(63.2~83.3%) was significantly higher than that ofthe soil as sole medium(60.7%). The water content was lowest in sole soil treatment(5.1%) andgrowing media as sole medium(57.8%) was the closely ideal range for pot culture(>60%). Although substrates were varying water to the atmosphere at similar rates which retained waterfor longer, growing media as sole still remain constant on high water content. It was confirmedthat strongly correlated between bulk density and water retentivity(correlation-0.85).
최주현,장경미,김민정,고지영,고성혜,이미연,민광선,김인규,최동일,박율리 대한영상의학회 2009 대한영상의학회지 Vol.60 No.4
Purpose: This study was designed to evaluate the diagnostic value of the use of inguinal ligament coronal-oblique CT images in the differentiation of femoral hernias from inguinal hernias. Materials and Methods: A total of 32 patients (with 11 femoral hernias and 21 inguinal hernias) underwent CT imaging. All of the examinations were performed with a 16-multidetector row CT (MDCT) scanner with contrast enhancement, and transverse sections, coronal sections and coronal-oblique CT images were reformed along an imaginary inguinal ligament plane. Two independent observers retrospectively evaluated the CT scans. Image analysis was first performed with only transverse and coronal images. A second analysis was then performed with transverse, coronal and coronal-oblique images. Results: The mean angle difference between coronal and coronal-oblique CT images was 8.0 degrees (range, 0-22 degrees). A radiologist correctly diagnosed the presence of a femoral hernia in nine (82%) of 11 patients and a radiology fellow correctly diagnosed the presence of a femoral hernia in seven (64%) of 11 patients in the first session. Both of the reviewers made the correct diagnosis in all patients in the second session. For inguinal hernias, both reviewers correctly diagnosed all patients during both sessions. The coronal-oblique CT images were the most valuable images for the evaluation of the relationship between hernias of the neck and inguinal ligament. Conclusion: Inguinal ligament coronal-oblique CT images can provide additional diagnostic value in the evaluation of groin hernias.