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김동현 ( Dong Hyeon Kim ),김의경 ( Eui Gyeong Kim ),박상병 ( Sang Byeong Park ),이정환 ( Jeong Hwan Lee ) 한국산림과학회 2010 한국산림과학회지 Vol.99 No.4
This study carried out the recognition of appropriate forest managements and directions in Jirisan National Park. For this purpose, we undertook interview survey about the recognition of forest management in Jirisan National Park from ecological and forest research fields` experts. From the statistical analysis results, it was founded that the difference among respondents` types was detected about recognition of forest management in National park. However, all the respondent types recognized that the forest management in National park is essential. So the forest management in national park by forest experts and relevant institutions are revealed needed.
Stainless steel crown 순면위에 레진피복을 이용한 전치부 심미적 수복
안수현,김재곤,백병주,박종하 大韓小兒齒科學會 1997 大韓小兒齒科學會誌 Vol.24 No.4
Despite dentistry's attempts to improve the dental health of the public and to minimize the effects of caries, many children still present with extensive destruction of primary anterior teeth. One of dentistry's most challenging tasks is to repair these teeth with restoration which are durable, retentive, and esthetic. Esthetic restoration can often be achieved with polycarbonate crowns, strip crowns, conventional S-S crowns, open-faced S-S crowns, commercially veneered S-S crowns. But, all of these have limitation. Advances in restorative materials and metal-bonding procedures have made possible new restorative techniques that combine the advantages of S-S crowns with the cosmetics of composite restoration methods. The described technique of bonding composite to trimmed and fitted S-S crowns offers many advantages over other techniques currently used to restore primary anterior teeth. 1. If S-S crowns are accurate trimmed and contoured, good retention of crowns is achieved. 2. The patient time required is similar to that of conventional S-S crowns. 3. Good esthetics and high bond strengths are achieved. 4. It is possible to use this veneering technique intraorally on crowns that have fractured veneers.
위성 ATM 망에서 ABR 서비스를 위한 트래픽 전송방식에 관한 연구
최병석,박재현,박현민,안현석,유재욱 동국대학교 산업기술연구원 1997 산업기술논문집 Vol.9 No.-
ATM의 ABR 서비스는 기본적으로 전달지연이 작은 지상망에 적합하게 개발되었기 때문에 위성 망과 같이 전달지연이 큰 상황에서는 망의 심각한 폭주나 링크의 채널 전송률 저하 등이 발생될 수 있다. 또한 위성채널은 지상 ATM 망에 비해 대역이 제한되어 있으므로 폭주를 미연에 방지하기 위해 보다 치밀하고, 지연에 덜 민감한 대역할당 알고리즘이 필요하다. 본 논문에서는 EPRCA 기반의 위성탑재 ATM 교환기로 구성된 위성 ATM 망에서 BECN과 큐의 상태정보를 이용하여 위성 ATM 망에서 ABR 서비스를 제공할 수 있는 방안을 제안하였다.
고태조,정병묵,양현모,박종권 한국공작기계학회 2008 한국공작기계학회 추계학술대회논문집 Vol.2008 No.-
High precision machining technology has become one of the important parts in the development of a precision machine. Such a machine requires high speed on a large workspace as well as high precision positioning. For machining systems having a long stroke with ultra precision, a micro stage system with lever mechanism is proposed in this paper. The proposed micro stages are activated by the piezo-actuators with high precision, however, they have severe disadvantage for the travel range that the stroke is limited to a few microns. Because it is not easy to increase the stroke of piezo-actuator, it is very difficult to make an X-Y stage with only piezo-actuators. Therefore, in order to increase it, this paper proposes a lever mechanism for the piezo-actuator stage. In the experiments, we can confirm that the stroke is increased more than three times and it is possible to implement the micro X-Y stage using piezo-actuators.
Paraquat 투여 백서에서 Cyclophosphamide와 Dexamethasone의 치료 효과
신정철,신양수,유병전,임현성,정태흥,박찬국,오금탁,이병래 朝鮮大學校 附設 醫學硏究所 1991 The Medical Journal of Chosun University Vol.16 No.1
Paraquat (N,N'-dimethy 1-4,4'bipyrydinium : Gramoxone^(R), a widely used herbicide, is extremely toxic to all green plants and many eukaryotic organisms. In human, paraquat intoxication leads to multiple organ failure, it preferentially damages the lung, kidney and liver and may result in death. The participation of superoxide in initiating tissue damage by administration of paraquat is well known in which one electron reduction of paraquat leads to the formation of radical species which react with molecular oxygen to give superoxide. This process initiates immunological changes with the activation of neutrophilic leukocytes, which is related to further production of superoxide. In this experiment, therapeutic effects of cyclophosphamide and dexamethasone on blood cell count, malondialdehyde as a indicator of lipid peroxidation, and antioxidant enzymes levels in the lung, liver and kidney of paraquat intoxicated rats were inbestigated. The WBC count were significantly decreased by combined treatment of cyclophosphamide and dexamethasone in paraquat intoxicated rats at 3 and 5 days but RBC count were not changed. The contents of malondialdehyde were significantly decreased in the lung and Kidney by combined treatment at 10 days after paraquat intoxication. The catalase acitvities were markedly increased in the lung and liver of rats at 10 days after paraquat intoxication, and superoxide dismutase activities showed minimal changes in the lung, liver and kidney of rats by combined treatment. These results suggest that paraquat induced tissue damage in rats can be redeced by combined administration of cyclophosphamide and dexamethasone.
Byeong-Hyeon Park,Shin-Won Bang,Ye-Lin Lee,Jae-Sang Park 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.11
A simulation study using an active vibration control system (AVCS) is conducted to reduce the vibration responses of UH-60A helicopter airframe and human body on a pilot seat in both low-and high-speed flights (μ = 0.15 and μ = 0.37). The 4P hub vibratory loads of the UH-60A helicopter are calculated using DYMORE II, a nonlinear multibody dynamics analysis code, and MSC. NASTRAN is used to predict the vibration responses of the UH-60A airframe and human body. MATLAB Simulink is used to construct the AVCS framework using seven accelerometers and five force generators. The AVCS in this study uses Fx-LMS algorithm to determine vibration-cancellation forces. When applying the AVCS to the UH-60A helicopter, the 4P airframe vibration response reductions at low-and high-speed flight conditions are 22.05 % to 97.83 % and 25.05 % to 91.81 %, respectively. The vibration responses of the human body are reduced from 89.29 % to 90.16 % and 61.23 % to 72.43 % at low-and highspeed flight conditions, respectively.
Park, Juyoung,Hyun, Byung Gwan,An, Byeong Wan,Im, Hyeon-Gyun,Park, Young-Geun,Jang, Junho,Park, Jang-Ung,Bae, Byeong-Soo American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.24
<P>We report an Ag nanofiber-embedded glass-fabric reinforced hybrimer (AgNF-GFRHybrimer) composite film as a reliable and high-performance flexible transparent conducting film. The continuous AgNF network provides superior optoelectronic properties of the composite film by minimizing transmission loss and junction resistance. In addition, the excellent thermal/chemical stability and mechanical durability of the GFRHybrimer matrix provides enhanced mechanical durability and reliability of the final AgNF-GFRHybrimer composite film. To demonstrate the availability of our AgNF-GFRHybrimer composite as a transparent conducting film, we fabricated a flexible organic light-emitting diode (OLED) device on the AgNF-GFRHybrimer film; the OLED showed stable operation during a flexing.</P>
Implementation of Ternary Adder and Multiplier Using Current-Mode CMOS
Hyeon-Kyeong Seong,Byeong-Ho Park,Sang-Ju Park,Dong-Young Park,Hong-Ki Min 대한전자공학회 2008 ICEIC:International Conference on Electronics, Inf Vol.1 No.1
In this paper, the ternary adder and multiplier are implemented by current-mode CMOS. First, we implement the ternary T-gate using current-mode CMOS. Second, the ternary adder and multiplier over finite fields GF(3) are implemented to using the ternary T-gates based on current-mode CMOS. Finally, these circuits are simulated by Spice under 1.5 ㎂ CMOS standard technology with 15 μA unit current and 3.3V VDD voltage. The ratio of the width (W) and the length (L) in CMOS channel is 20 ㎛/2 ㎛. The simulated results are shown the satisfied current characteristics.