• Title/Summary/Keyword: 이양정(二養亭)

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A review of biocompatibility of zirconia: In vitro experiment (지르코니아의 생체적합성에 대한 연구: In vitro 실험 문헌 고찰)

  • Suh, Da-Won;Kim, Young-Kyun;Yi, Yang-Jin
    • The Journal of Korean Academy of Prosthodontics
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    • v.56 no.4
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    • pp.391-395
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    • 2018
  • Increasing demands for zirconia material in clinics, assessment of biocompatibility of zirconia is essential. In this article, a review of in vitro studies of zirconia compatibility was performed. Zirconia showed great biocompatibility at in vitro studies with various cell lines such as fibroblasts, osteoblasts, and lymphocytes. Many studies reported that zirconia caused no cytotoxicity or mutation. Zirconia also showed less bacterial adhesion. There were no adverse effects except for small reduced strength with in vitro study mimicking long-term exposure of body fluid. According to the study with ostoblast-like cells, zirconia could regulate genes of immunity, molecular transport, and cell cycle. Such gene regulating was considered as one of the reasons of zirconia biocompatibility. With biocompatibility of zirconia powders, in vitro studies had controversial conclusions. It seems that zirconia powders might have cytotoxicity.

On the Composition of Evaluation Questions Corresponding to Each Level in Matrix Chapter of the High School (행렬의 수준별 평가에 대한 연구)

  • Lee, Min-Jung;Lee, Yang
    • Journal of the Korean School Mathematics Society
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    • v.13 no.3
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    • pp.357-379
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    • 2010
  • There are many studies about the method of trying leveled class because we say the Excellence of Education after high school's Equalization Policy. After the leveled c1ass, Ministry of Education, Science and Tech. announced the induction of leveled classes' evaluation in 2008, it is called that students take classes adapted to their levels. This study illustrates criteria of forming evaluation, it composes leveled assessment tests referenced by Gibb's evaluation effects & Cotton's evaluation principles. Before anything else, this study induced contents of studies which is emphasized the structure rather than the arithmetic that is based on Foucault' s analysis of mathematics' class and examination & MacGregor's point of algebra. Since then we made leveled assessment tests which made by students' Question. And then, In this study, we modified evaluation tests appropriately by criteria of evaluation and analysing the result.

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An event-driven intelligent failure analysis for marine diesel engines (이벤트 기반 지능형 선박엔진 결함분석)

  • Lee, Yang-Ji;Kim, Duck-Young;Hwang, Min-Soon;Cheong, Young-Soo
    • Journal of Korea Society of Industrial Information Systems
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    • v.17 no.4
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    • pp.71-85
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    • 2012
  • This paper aims to develop an event-driven failure analysis and prognosis system that is able to monitor ship status in real time, and efficiently react unforeseen system failures. In general, huge amount of recorded sensor data must be effectively interpreted for failure analysis, but unfortunately noise and redundant information in the gathered sensor data are obstacles to a successful analysis. This paper therefore applies 'Equal-frequency binning' and 'Entropy' techniques to extract only important information from the raw sensor data while minimizing information loss. The efficiency of the developed failure analysis system is demonstrated with the collected sensor data from a marine diesel engine.

Design of Integrated Portal Service System for Creation of High Quality Scientific and Technologic Academic Information (고품질 과학기술 학술정보 생산을 위한 종합 포털 서비스 체계의 설계)

  • Jeong, Hee-Seok;Park, Jae-Won;Lee, Yang-Sun
    • Journal of Korea Multimedia Society
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    • v.12 no.11
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    • pp.1530-1538
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    • 2009
  • KISTI-ACOMS ver. 2.0 has been distributed to more than 340 academic societies and used by more than 130 academic societies for 4 years since 2005 and still is desired for use by lots of other academic societies. But contrary to the desire and requests for system upgrades of academic societies, ACOMS has not been improved for last 3 years and some academic societies began to use domestic or foreign similar pay online peer review systems. In this paper, a new integrated portal service system is suggested in order to attempt national production cost-saving and quality improvement of academic information by creating and collecting high quality scientific and technologic academic information inexpensively. We come up with methodology of integration and utilization of a personal academic activity portal system interoperable with other services of KISTI, an open citation reference database automatically constructed by authors' activity and a journal evaluation system based on impact factor.

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Effects of Freeze-dried Green Vegetable Extract on Lipid Profiles and Antioxidant Status in the Rat (녹즙분말이 흰쥐의 지질패턴 및 항산화 체계에 미치는 영향)

  • Park Jung Hwa;Kim Soo Yeon;Chung Eun Jung;Sun Yoon;Lee Yang Cha
    • Journal of Nutrition and Health
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    • v.38 no.1
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    • pp.11-19
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    • 2005
  • There has been increasing research interests that green vegetables play beneficial roles in human health. This study was performed to investigate the effects of freeze-dried green vegetable extract of Angelica keiskei Koidz (A) and Brassica oleracea acephala (B) on lipid profiles and antioxidant status in rats. Seven-weeks old male Sprague Dawley rats were divided into 6 groups and fed diets containing 5% A & B and 0.5% cholesterol (cho) for 8 weeks [Control Diet (C) & C + chol (CC), A & A + chol (AC), B & B + chol (BC)]. Lipid profiles and antioxidant status were determined by enzyme assay methods. The serum levels of [LDL + VLDLJ-cholesterol of the rats fed vegetable extract diets A and B were significantly lower than that of group C and the ratios of HDL/[LDL + VLDL] were significantly higher in groups A and B. Addition of cholesterol in the diet, however, abolished this effect. The Brassica oleracea acephala juice lowered serum TG level even when cholesterol was added to the diet. Serum total antioxidant status(TAS) were significantly higher in groups A and B as compared to the control group and the ratios of [GSH-Px +Catalase]/total-SOD in the liver were also significantly higher in groups A and B indicating that H202 produced be efficiently removed. In conclusion, freeze-dried green vegetable extract diets (A and B) improved serum lipid profiles by increasing the HDL/[LDL + VLDL〕 ratio and exerted favorable influences on antioxidant systems by improving total antioxidant status (TAS) in serum and by significantly increasing the ratio of [GSH-Px + Catalase]/total-SOD in the liver.

CSF Leakage through a Subarachnoid-pleural Fistula after Resection of a Malignant Solitary Fibrous Tumor (악성 고립성 섬유종 제거술 후 발생한 뇌척수액의 흉강내로의 유출)

  • Choi, Kwang-Ho;Lee, Yang-Haeng;Hwang, Youn-Ho;Yoon, Young-Chul;Cho, Kwang-Hyun;Jung, Yong-Tae
    • Journal of Chest Surgery
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    • v.43 no.3
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    • pp.332-335
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    • 2010
  • Solitary fibrous tumor is an uncommon submesothelial mesenchymal neoplasm that primarily arises from the pleura. Most solitary fibrous tumors have a benign course, and the single most important predictor of the clinical outcome is the ability to excise the entire lesion. We experienced a case of CSF leakage through a subarachnoid-pleural fistula after resection of a malignant solitary fibrous tumor and the involved rib. We detected CSF leakage via performing CT myelography and we treated this case with hemilaminectomy and dura repair.

Survey for U-Greenhouse System Technology (U-온실 시스템 기술에 대한 분석)

  • Park, Sang-Oh;Lee, Yang-Sun;Kim, Se-Han;Park, Ji-Soo;Yi, Ki-Jung;Park, Jong-Hyuk
    • Journal of Advanced Navigation Technology
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    • v.16 no.1
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    • pp.89-95
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    • 2012
  • This paper introduces domestic and international trends and researches related with U-Greenhouse systems. USN (Ubiquitous Sensor Networks), along with the development of networks as well as science and technology, is a new computing paradigm which is the convergence of user-oriented physical activity space and virtual space of electronics and computing and also provides services according to change in surrounding environment at anytime and anywhere. The U-Greenhouse system is to apply USN to agricultural production, logistics and distribution management which are relatively insufficient to utilize IT technology. Thus, applying u-IT technology to agriculture can reinforces international competitiveness of the agricultural sector through the effects such as cost cutting as a rise in output, logistics and distribution management.

An Experimental Study of a Diffuser Starting Characteristics for Simulating High-Altitude Environment by using a Liquid Rocket (액체로켓엔진 연소기를 이용한 고고도 환경 모사용 디퓨저 시동특성 연구)

  • Lee, Yang-Suk;Jeon, Jun-Su;Ko, Young-Sung;Kim, Yoo;Kim, Sun-Jin
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.38 no.12
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    • pp.1195-1201
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    • 2010
  • Performance tests of a supersonic exhaust diffuser were conducted by using a liquid rocket engine for simulating high-altitude environment. The experimental setup consisted of a combustion chamber, a vacuum chamber and a diffuser. The combustion tests for simulating high-altitude environment were carried out at three cases by chamber pressure variation(26, 29, 32barg). The test results showed that the diffuser was started at all case and vacuum chamber pressures were approximately 140torr. The starting pressure using combustion gas was similar with that of cold gas, but the vacuum chamber pressure was relatively high because of high temperature in the vacuum chamber. The results of this test can be used as an essential database for the design of real-scale high-altitude simulation test facility in the future.

CAD/CAM Script Application Techniques for Addition Axial Application of CNC M/C (CNC가공기의 부가축 활용을 위한 CAD/CAM Script 활용 기법)

  • Lee, Yang-Chang
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.10 no.6
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    • pp.1157-1163
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    • 2009
  • In order to improve in quality and productivity using the CNC machine tools, it has been endeavored to elevate production process by adding supplementary axes(2 axes) to 2,3 axial CNC machine tools. It is because the movement between the progress of work in processed goods is remarkably decreased more than that of general CNC machine tools that productivity improvement with precision maintenance can be improved. VBScript in CAD/CAM is applied to utilize CNC machine tools added supplementary axes so that Multi-axial &Multi-process manufacturin g program can be conveniently drawn up. However, there is generally much skilful work and operation by the manual program of CAD(2.5D) and CNC machine tools in the filed. As a result of conducting an experiment by COM-filing VBScript at the spot of Insert Tip for milling Face Cutter in CAD/CAM Software(2.5D), it was not only timesaving to draw up program but also more convenient than complicated Multi CAD/CAM Software to approach and possible to program various products instantaneously.

On the Usage of the Multiplication and Parentheses signs (곱셈과 괄호 기호의 사용에 대한 연구)

  • Lee, Min Jung;Lee, Yang;Yang, Sung Pil;Park, Mi Suk
    • Journal of the Korean School Mathematics Society
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    • v.15 no.4
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    • pp.627-641
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    • 2012
  • We found a few students had an error in the function and equation units, because most of mathematicians omitted the multiplication signs. In the mathematical history, the multiplication and parentheses signs had various changes. Based on the Histogenetic Principle, high level students know that the letter in the functions and equations represents a number and the related principles, so they have no big problems. But since the low level students stay in the early days in the mathematical history, they have some problems in the modern function and equation. Therefore, while we study the function and equation units with the low level students, we present that we have to be cautious when we omit the multiplication and parentheses signs.

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