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鄭然斗,韓世範,李正閏 三陟大學校 1999 論文集 Vol.32 No.1
This paper presents a study on the effect of the operating conditions on the traction characteristics of differential type traction drive. The cross roller type traction drive was used to observe the speed ratio and the power transmission efficiency of traction drive. The effects of spin motion and the power transmission efficiency between two tapered rollers of the traction drive are discussed and experimented. It is shown that the power transmission efficiency can increase up to 53% in the case of an experimental traction drive. the traction surface roughness of the tapered roller was also measured and observed by scanning electron microscope. On the basis of these results, the effects of specific sliding, roller speed, load, and contact pressure were clarified to a considerable extent.
Cheong, Jun Young,Kim, Chanhoon,Jung, Ji-Won,Yun, Tae-Gwang,Youn, Doo Young,Cho, Su-Ho,Yoon, Ki Ro,Jang, Hye-Yeon,Song, Seok Won,Kim, Il-Doo Elsevier 2018 Journal of Power Sources Vol.400 No.-
<P><B>Abstract</B></P> <P>Lithium-ion batteries (LIBs) with higher energy density are necessary to meet the increasing demands of energy storage system (ESS) in near future. Tin (IV) oxide, SnO<SUB>2</SUB>, is one of highly promising anode candidates due to its high theoretical capacity (782 mAh g<SUP>−1</SUP>), abundance, environmental friendliness, and safety with organic electrolytes. However, a rapid capacity fading and poor rate capabilities arising from the large volume expansion and subsequent agglomeration of Sn nanoparticles have been major issues of SnO<SUB>2</SUB>. Here, we have synthesized one-dimensional (1D) SnO<SUB>2</SUB>-amorphous titanium (IV) oxide NTs (SnO<SUB>2</SUB>-a-TiO<SUB>2</SUB> NTs), which allow both facile ionic and electron transport as well as easy penetration of electrolytes. The resultant SnO<SUB>2</SUB>-a-TiO<SUB>2</SUB> NTs not only alleviate volume expansion by maintaining their structural integrity but also possess minimal charge transfer resistance even after a number of cycles. SnO<SUB>2</SUB>-a-TiO<SUB>2</SUB> NTs exhibit both excellent cycle retention characteristics (1050.2 mAh g<SUP>−1</SUP> after 250 cycles) and outstanding rate capability (522.3 mAh g<SUP>−1</SUP> at a current density of 5000 mA g<SUP>−1</SUP>), which is attributed to the introduction of amorphous TiO<SUB>2</SUB> that not only acts as buffer agent for volume changes of SnO<SUB>2</SUB> but also allows fast surface-controlled diffusion process due to its pseudocapacitive charge storage mechanisms.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Introduction of amorphous TiO<SUB>2</SUB> into SnO<SUB>2</SUB> nanotubes (SnO<SUB>2</SUB>-a-TiO<SUB>2</SUB> NTs). </LI> <LI> SnO<SUB>2</SUB>-a-TiO<SUB>2</SUB> NTs fabricated by one-step electrospinning and calcination. </LI> <LI> Incorporation of amorphous TiO<SUB>2</SUB> leads to higher Li diffusivity. </LI> <LI> SnO<SUB>2</SUB>-a-TiO<SUB>2</SUB> NTs exhibit excellent cycle retention and rate capabilities. </LI> <LI> Amorphous TiO<SUB>2</SUB> effectively alleviates the volume changes of SnO<SUB>2</SUB>. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
680nm 파장에서 TbFeCo 광자기 기록매체의 동특성
윤두원,연정,김명룡,Yoon, Doo-Won,Yeon, Cheong,Kim, Myong-Ryeong 한국전기전자재료학회 1995 電氣電子材料學會誌 Vol.8 No.5
Dynamic characteristics of TbFeCo magneto-optical recording media at 680nm wavelength region were studied by means of computer simulation of disc structure and optimization of process variables during sputter deposition. With the slightly reduced Kerr rotation angle due to the reduced wavelength of optical laser source, the improved recording density in TbFeCo magneto optical media showing the CNR greater than 50dB could be achieved by only adjusting the thickness of dielectric and the recording layers when the wavelength of light source is changed from 780nm to 680nm. In addition, the recording power margin of 5mW and the 2mW minimum recording power was realized, It was shown from the present study that the increase in laser power density demonstrated feasibility of low cost and low power laser diode with the reduced optimum recording power.
Delayed-Onset Anaphylaxis Caused by IgE Response to Influenza Vaccination
Min Jung Kim,Doo Hee Shim,Hye-Ran Cha,Cheong Bi Kim,Soo Yeon Kim,Jeon Han Park,Myung Hyun Sohn,이재면,김경원 대한천식알레르기학회 2020 Allergy, Asthma & Immunology Research Vol.12 No.2
Influenza vaccine-associated anaphylaxis is a very rare allergic reaction to vaccines, but the most concerning and life-threatening adverse reaction. Although the safety of influenza vaccines has been well documented, occasional cases of anaphylaxis in vaccinated patients have been reported. In this study, we analyzed the immunoglobulin E (IgE) response to whole influenza vaccines in a pediatric case of delayed-onset anaphylaxis after influenza vaccination. The patient showed elevated specific IgE levels against whole influenza vaccines, especially with split virion from egg-based manufacturing process. Specific IgE levels to influenza vaccines showed decreased over. We evaluated a causal relationship between influenza vaccine and anaphylaxis event by enzyme-linked immunosorbent assay. Delayed-onset anaphylaxis after influenza vaccination can occur in children without predisposing allergic diseases. In addition, the results suggested that formulation and production system of influenza vaccines could affect the probability of severe allergic reaction to vaccines.
Roh, Eunmiri,Yun, Cheong-Yong,Young Yun, Ji,Park, Dongsun,Doo Kim, Nam,Yeon Hwang, Bang,Jung, Sang-Hun,Park, Sun Ki,Kim, Yun-Bae,Han, Sang-Bae,Kim, Youngsoo The Society for Investigative Dermatology, Inc 2013 The Journal of investigative dermatology Vol.133 No.4
Microphthalmia-associated transcription factor (MITF) is inducible in response to cAMP and has a pivotal role in the melanocyte-specific expression of tyrosinase for skin pigmentation. Here we suggest that the cAMP-binding site of protein kinase A (PKA) is a target in the inhibition of the melanogenic process in melanocytes, as evidenced from the molecular mechanism of small molecules such as bisabolangelone (BISA) and Rp-adenosine 3′,5′-cyclic monophosphorothioate (Rp-cAMPS). BISA is a sesquiterpene constituent of Angelica koreana, a plant of the Umbelliferae family, whose roots are used as an alternative medicine. BISA competitively inhibited cAMP binding to the regulatory subunit of PKA and fitted into the cAMP-binding site on the crystal structure of PKA under the most energetically favorable simulation. In α-melanocyte-stimulating hormone (α-MSH)–activated melanocytes, BISA and Rp-cAMPS nullified cAMP-dependent PKA activation, dissociating catalytic subunits from an inactive holoenzyme complex. They resultantly inhibited cellular phosphorylation of the cAMP-responsive element-binding protein (CREB) or another transcription factor SOX9, thus downregulating the expression of MITF or the tyrosinase gene with decreased melanin production. Taken together, this study defined the antimelanogenic mechanism of BISA or Rp-cAMPS with a notable implication of the cAMP-binding site of PKA as a putative target ameliorating melanocyte-specific hyperpigmented disorder.
이정우,정연두,한명근,Lee Jeong-Woo,Cheong Yeon-Doo,Han Myoung-Keun 한국공학교육학회 2005 공학교육연구 Vol.8 No.1
이 논문은 삼척대학교 메카트로닉스 공학부에서 자동제어, 디지털제어, 마이크로 프로세서응용의 실습을 위해 사용되는 자기 부상실습장치의 설계와 제작에 관한 것이다. 이 장치는 MIT 대학의 설계에서 영감을 받아 개발되었으나, MIT의 장치가 아날로그형임에 비해 디지털형으로 개발하였다. 이 실습장치는 아날로그와 디지털 방식으로 동시에 제어하고 모니터할 수 있다. 더구나 부품의 가격은 MIT의 것과 비슷하거나 더 싼 편이다. 그리고 이 장치는 자기 홀 센서나 적외선 센서를 이용하여 제어할 수 있어서 학생들에게는 센서의 사용과 신호처리를 위한 다양한 경험을 얻을 수 있도록 되어있다. 이 설계는 저자들이 제작하여 시험해 보았으며, 학생들에게 실험 프로젝트 형식으로 제공될 것이다. 이 장치는 의도적으로 덜 보상되어지고, 적당한 수준까지만 조립된 상태에서 학생들에게 제공될 것이며, 학생들은 센서신호와 제어기의 성능을 분석한 후 보상기를 설계하고 센서의 신호를 처리할 것이 기대된다. This paper describes the design and fabrication of magnetic levitation kits for use in the hands on experiments of automatic control, digital control and microprocessor applications in the division of mechatronics in Samcheok university. The kits are developed inspired by MIT's design, but it is designed on the digital basis, whereas MIT's is designed on the analog basis. As a result, the kits can be monitored and controlled on the analog and digital control techniques. Furthermore, the cost of kit components is comparable or lower to that of MIT design. And the kits can be controlled with magnetic hall sensors and/or infrared sensors, which provides more versatile experience on the use of sensors and signal filtering to the students. The design is fabricated and tested by authors and will be provided to the students as lab projects. The kits will be intentionally presented with a device that is poorly instrumented and poorly compensated. And the students are expected to analyze sensor signal and controller performance, and then, perform compensator design and signal filtering.
Wafer Slicing Machine의 Wire 장력 제어
이정우(LEE Jeong-Woo),정연두(Cheong Yeon-Doo),김두형(KIM Doo-Hyeong) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.5
We have studied the technique of wire tension control for use in wafer slicing machines, which is used to produce thin(thickness below 200μm) silicon wafer for solar cells. For this purpose, we analyse the wire cutting system, and some necessary dynamics of cutting system to control the tension of thin wire. As a result, we devised a novel wire tension control system and designed a experimental wire tension control system. The system is used to verify wire tension control algorithm. Through numerous experiments, wire tension control error within 10% is realized while maintaining wire feeding speed as 15-20m/sec. These experimental results verifies the effectiveness of the developed wire tension control system. This technique will contribute to cost down of thin silicon wafer for solar cells for next generation.