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미세가공기술을 이용한 Interdigitated Array 전극의 제작 및 응용
이강신,김태한,김승렬,신민철,이원용,박제균 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1
Interdigitated array (IDA) electrodes were fabricated using silicon technology for highly sensitive biosensing. Thin-film platinum and gold IDA electrodes were fabricated with 10 μm band width and 7 μm gap between the bands using photolithographic techniques. The IDA electrode has 100 fingers consisting of 50 finger anodes and 50 finger cathodes. By applying both the oxidation and the reduction potentials of a reversible redox couple, ferrocyanide, to the pairs of the IDA electrode, an increased current generation can be observed. In our experiment, the collection efficiency of IDA electrode was 46% and amplification factor was 12.6. This preliminary experiment implies that the IDA electrode could be applied to biosensor fabrications as the sensitive electrochemical transducer when a lower detection limit is needed such as phenol sensor for drinking water analysis.
Best Practice 구현에 의한 신발 제조 자원관리 시스템
류영근,이태문,서승록,김행렬 한국의사결정학회 2000 경영과학연구 Vol.9 No.-
Presented in this paper is a development of ERP systems for footwear manufacturing. Final goal of the system development is to construct ERP system covering all works from order to make, shipment, accounting. And the objective of this paper is to introduce to completed 6 sub-systems of developing total 13 sub-system for production resource planning. In this study, introduce analysis of existing business flow and design of standard business process for development of systems. Also describe input and output of the standard business process for production resource management and basic structure, design of the total system flow, configuration of completed 6 sub-systems are presented. Finally, function of software modules and principal algorithms and basic data structuring techniques on the 6 sub-systems are explained.
인공고관절용 스테인리스강 316L에 증착된 다이아몬드상 카본 필름의 전기화학적 특성에 관한 연구
김호건,안승호,김정구,박세준,이광렬 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.4
Diamond-like carbon (DLC) films have several advantages in applications such as high hardness, chemical inertness, low friction and electrical insulation. Furthermore, DLC-coated STS 316L films have been reported to have a good biocompatibility, such as the absence of inflammatory response. Thus, corrosion resistance is the first consideration for the biomaterials to be used in the body. DLC films have been deposited onto substrates of STB 316L for artificial hip joints using r.f PACVD (plasma-assisted chemical vapor deposition) with C_(6)H_(6) and mixture of C_(6)H_(6) and SiH_(4) as the process gases. Three kinds of DLC-coated films were prepared as a function of diverse bias voltage and Si incorporation. Corrosion behavior of DLC films was investigated by electrochemical techniques (potentiodynamic polarization test and electrochemical impedance spectroscopy) and surface analyses (atomic force microscopy and scanning electron microscopy). The electrolyte used in his test was a 0.89%NaCl solution of pH 7.4 at temperature 37℃. Electrochemical measurements showed that DLC films with higher bias voltage and Si incorporation could improve corrosion resistance in the simulated body fluid environment. (Received December 5, 2003)
김새인,이동현,김광현,류동열,김승정,강덕희,최규복,이신아 이화여자대학교 의과학연구소 2015 EMJ (Ewha medical journal) Vol.38 No.3
Objectives: Metabolic acidosis frequently develops in patients after neobladder reconstruction. However, the incidence of metabolic acidosis in patients with neobladder and the factors associated with the development of metabolic acidosis have not been well elucidated. We aimed to investigate the incidence and the potential predictors for the development of metabolic acidosis after neobladder reconstruction with intestinal segment. Methods: We included patients who underwent neobladder reconstruction using intestinal segment at Ewha Womans University Mokdong Hospital between January 1, 2005 and December 31, 2014. A subgroup of patients according to the time of metabolic acidosis occurrence was further analyzed in order to characterize predictors for metabolic acidosis. Results: Metabolic acidosis was encountered in 79.4% of patients with neobladder during follow up period. When patients were divided into 2 groups according to anion gap (AG), total CO2 (18.9±2.1 mEq/L vs. 20.0±1.3 mEq/L, P=0.001) and chloride (106.6±4.9 mE/L vs. 109.4±3.6 mEq/L, P<0.001) were significant different between groups with AG>12 and AG≤12. Furthermore, when patients were divided into 3 groups; patients with metabolic acidosis at postoperative day (POD) 1; from POD 2 to 14 days; after 14 days, there was significant difference among those subgroups. Conclusion: Our study showed the rate of metabolic acidosis in patients underwent neobladder reconstruction and the difference between patients with metabolic acidosis and those without metabolic acidosis for the first time in Korea. In the future, well designed prospective study will be needed to prevent metabolic acidosis after neobladder reconstruction.
권석주,송영은,권영립,이덕렬,조승현,최동철 원광대학교 2005 論文集 Vol.35 No.-
Increasing concern about a rice quality, it is considered postharvest technology as well as cultivation management as an important factor. Therefore it is necessary to find optimal drying, storage method that did not affected a rice quality. In order to find the optimum storage period of rice, the rice quality was investigated during storage period. The temperature and humidity of storage bin were greatly changed but those of rice were a little do. The germination rate was slowly decreased as the storage period is long. The content of moisture was affected by a room temperature, it was increased at stored rice in rainy season(10-Jul~20-Jul). As storage period is long, the content of amylose, fatty acidity were a just Little changed but did not showed a constant tendency to it. The content of protein was increased and mechanic palatability value was decreased during storage period. The chromaticity of milled rice showed a range of lightness(L); 75.15~71.75, redness(a); 0.21~0.91, yellowness(b); 16.78~19.28 during storage period.
Seung Ryeol Lee,Tae Ho Lee,Seung-Hun Song,Dong Suk Kim,Kyung Hwa Choi,Jae Ho Lee,Dae Keun Kim 대한생식의학회 2021 Clinical and Experimental Reproductive Medicine Vol.48 No.4
A genetic etiology of male infertility is identified in fewer than 25% of infertile men, while 30% of infertile men lack a clear etiology, resulting in a diagnosis of idiopathic male infertility. Advances in reproductive genetics have provided insights into the mechanisms of male infertility, and a characterization of the genetic basis of male infertility may have broad implications for understanding the causes of infertility and determining the prognosis, optimal treatment, and management of couples. In a substantial proportion of patients with azoospermia, known genetic factors contribute to male infertility. Additionally, the number of identified genetic anomalies in other etiologies of male infertility is growing through advances in whole-genome amplification and next-generation sequencing. In this review, we present an up-to-date overview of the indications for appropriate genetic tests, summarize the characteristics of chromosomal and genetic diseases, and discuss the treatment of couples with genetic infertility by microdissection-testicular sperm extraction, personalized hormone therapy, and in vitro fertilization with pre-implantation genetic testing.
ICP-MS를 이용한 화강암내 희토류원소 분석시 저어콘이 미치는 영향
이승구(Seung-Gu Lee),김태훈(Taehoon Kim),한승희(Seunghee Han),김현철(Hyeon Cheol Kim),이효민(Hyo Min Lee),Tsuyoshi Tanaka,이승렬(Seung Ryeol Lee),이종익(Jong Ik Lee) 한국암석학회 2014 암석학회지 Vol.23 No.4
ICP-MS를 이용한 화강암질 암석내 희토류원소의 함량 분석시 저어콘이 미치는 영향과 저어콘의 산분해 정도를 미국지질조사소(USGS)의 화강섬록암 표준시료 GSP-2와 일본지질조사소(GSJ) 화강암 표준시료 JG-1a를 이용하여 조사하였다. 아울러 화강암에서 분리된 저어콘 광물에 대해 일반적인 산분해법과 압력용기(bomb)을 이용한 산분해법을 적용하여 지르코늄(Zr)과 희토류원소의 함량을 측정하였다. 실험결과에 의하면, 저어콘은 일반 산분해의 경우 50% 정도가 산분해된 것으로 나타났고, 압력용기를 이용한 경우에는 약 90% 전후가 분해된 것으로 확인되었다. 그리고 GSP-2와 JG-1a의 경우 추천값에 비해 지르코늄의 함량이 50% 정도인 것으로 나타났다. 이는 일반적인 화강암의 산분해의 경우 저어콘의 용해도가 실제로는 50% 정도 밖에 되지 않음을 지시한다. 하지만, 화강암내 희토류원소의 함량의 경우, 저어콘의 분해도와 상관없이, 추천값과 거의 일치하였다. 이는 저어콘의 불완전분해가 암석시료에서의 희토류원소 분포도를 이용한 암석학적 혹은 지구화학적 해석에 큰 영향을 주지는 않는다는 것을 지시해준다. We measured rare earth element and Zr concentrations of USGS granite standard material GSP-2 and GSJ granite standard material JG-1a to clarify the effect of zircon during rare earth element analysis using ICP-MS. We also measured rare-earth element and zirconium (Zr) contents of zircon from granite by acid-digestion methods using conventional teflon vial and pressure-bomb. The results show that aciddigestion using teflon vial dissolved ca. 50% of zircon compared to pressure-bomb method. The Zr contents of JG-1a and GSP-2 gave ca 50% of reference value. However, rare-earth element abundance of JG-1a and GSP-2 were similar to those of reference values. This suggests that the decomposition degree of zircon might give a negligible effect on a petrological and geochemical interpretation using chondritenormalized REE pattern.