• Title/Summary/Keyword: V

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Intermolecular Interaction and Molecular Energy Transfer ; Vibrational Relaxation of Highly Excited HF and DF (문자간 상호작용과 에너지이동에 대한 이론적 연구 ; 높은 振動準位로 들뜬 HF 및 DF 의 振動緩和)

  • Chang Soon Lee;Min Joo Lee;Yoo Hang Kim
    • Journal of the Korean Chemical Society
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    • v.29 no.6
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    • pp.592-598
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    • 1985
  • The total vibrational deexcitation rate constants $k_{v,v-1}$ of HF(v = 5-7) by HF(${\mu}$ = 0) and DF(${\mu}$ = 9-12) by DF(${\mu}$= 0) including both the vibration to vibration (V ${\to}$ V) and vibration to rotation and translation (V ${\to}$ R, T) energy transfer channels have been calculated semiclas-sically using a simplified collision model. The calculated results are in reasonably good agreement with those obtained by experimental and other theoretical studies. The rate constants increase with increasing temperature and also with increasing v. They also show that the relaxation of the highly excited HF and DF occurs predominantly via the V ${\to}$ R, T path at low temperature. The effectiveness of the V ${\to}$ V path, however, increases as the temperature is raised.

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Investigation of the Effect of kV Combinations on Image Quality for Virtual Monochromatic Imaging Using Dual-Energy CT: A Phantom Study

  • Jeon, Pil-Hyun;Chung, Heejun;Kim, Daehong
    • Journal of Radiation Protection and Research
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    • v.43 no.1
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    • pp.1-9
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    • 2018
  • Background: In this study, we investigate the image quality of virtual monochromatic images synthesized from dual-energy computed tomography (DECT) at voltages of 80/140 kV and 100/140 kV. Materials and Methods: Virtual monochromatic images of a phantom are synthesized from DECT scans from 40 to 70 keV in steps of 1 keV under the two combinations of tube voltages. The dose allocation of dual-energy (DE) scan is 50% for both low- and high-energy tubes. The virtual monochromatic images are compared to single-energy (SE) images at the same radiation dose. In the DE images, noise is reduced using the 100/140 kV scan at the optimal monochromatic energy. Virtual monochromatic images are reconstructed from 40 to 70 keV in 1-keV increments and analyzed using two quality indexes: noise and contrast-to-noise ratio (CNR). Results and Discussion: The DE scan mode with the 100/140 kV protocol achieved a better maximum CNR compared to the 80/140 kV protocol for various materials, except for adipose and brain. Image noise is reduced with the 100/140 kV protocol. The CNR values of DE with the 100/140 kV protocol is similar to or higher than that of SE at 120 kV at the same radiation dose. Furthermore, the maximum CNR with the 100/140 kV protocol is similar to or higher than that of the SE scan at 120 kV. Conclusion: It was found that the CNR achieved with the 100/140 kV protocol was better than that with the 80/140 kV protocol at optimal monochromatic energies. Virtual monochromatic imaging using the 100/140 kV protocol could be considered for application in breast, brain, lung, liver, and bone CT in accordance with the CNR results.

Development of 11,000V & 13,800V Medium Voltage Inverter using H-Bridge Multilevel (H-브릿지 멀티레벨을 적용한 11,000V & 13,800V 고압인버터 개발)

  • Park, Young-Min;Kim, Jong-Cheol;Cho, Sung-Joon
    • Proceedings of the KIPE Conference
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    • 2016.07a
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    • pp.415-416
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    • 2016
  • 본 논문은 입출력 전력품질이 우수하고 전압별 시리즈화가 용이한 Cascaded H-브릿지 멀티레벨 전력 회로를 적용한 고압 대용량 전동기 구동용 11,000V / 13,800V 고압인버터 개발에 관하여 기술하였다. 기존에 개발된 3,300V/200kVA - 6,600V/8,000kVA 고압인버터의 단상 인버터로 구성된 개별 파워 셀 전압 증대, 파워 셀의 직렬 갯수 추가, 입력 위상 전이 다권선 변압기 2차 권선수 확장, 그리고 분산 제어 기능을 확대하는 방식을 적용하여 전압을 증가시켰다. 실용량 제품의 제작 (11,000V/1,000kVA, 13,800V/2,400kVA) 및 실험을 통하여 개발된 11,000V/13,800V 고압인버터의 성능을 확인하였다.

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A Solution for 345kV Overvoltage in KEPCO System using 345kV-154kV Tap Sensitivity (345kV-154kV 탭 감도를 활용한 한전 계통 수도권 345kV 과전압 해소 방안)

  • Bae, Moonsung;Cho, Hwanhee;Lee, Byongjun;Choi, Jang-Hum;Cha, Seungtae
    • Proceedings of the KIEE Conference
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    • 2015.07a
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    • pp.278-279
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    • 2015
  • 한전 계통의 수도권 부하 밀집과 지중화 선로 증가로 인해 수도권 345kV 계통 과전압이 큰 문제가 되고 있다. 조상설비 투입 후에도 과전압이 문제가 되는 경우, 과전압 해소를 위한 다른 방안이 필요하다. 본 논문에서는 345kV 과전압 해소를 위한 345kV-154kV 변압기 탭조절 방안을 검토하였다. 효율적인 과전압 해소를 위해 탭 감도를 이용하여 탭 조절을 수행하였다. 또한 일반적인 경우 345kV-154kV 변압기의 2차측 전압을 올리면 1차측 전압이 떨어지지만 본 논문에서는 그렇지 않은 경우를 찾아내고 해당 원인을 분석하였다. 모의를 위한 데이터는 2014년 한전 과전압 모의 데이터를 사용하였다.

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V$_{GS}-V_{TH}$ scaling for low power CMOS circuit (저전력 CMOS 회로를 위한 V$_{GS}-V_{TH}$ 스케일링)

  • 강대관;박영준;민홍식
    • Journal of the Korean Institute of Telematics and Electronics A
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    • v.33A no.3
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    • pp.82-88
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    • 1996
  • A simpel formular is proposed for the analysis of gate delay of CMOS gate in the low V$_{GS}-V_{TH}$ scaling. The effects of magnitude of V$_{GS}-V_{TH}$ on gate delay can be readily found through the formula so that it can be used ot design the device parameters in the low V$_{DD}$ CMOS circuits. The measured sresutls confirm the usability of the proposed formula and quantifies the improtance of V$_{TH}$ effects on gate delay under low voltae operation. Applying the formula to the prototype NMOSFET devices representing the five generations of technology, the impacts of the V$_{GS}-V_{TH}$ on the various aspects of the circuit and device characteristics are investigated in a consistent manner.

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Characteristics analysis of Sub-50nm Double Gate MOSFET (Sub-50nm Double Gate MOSFET의 특성 분석)

  • 김근호;고석웅;이종인;정학기
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2002.11a
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    • pp.486-489
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    • 2002
  • In this paper, we have investigated characteristics of sub-50nm double gate MOSFET. From I-V characteristics, we obtained =510$\mu$A/${\mu}{\textrm}{m}$ at VMG=VDS=1.5V and VSG=3.0V. Then, the transconductance is 111$\mu$A/V, subthreshold slope is 86mV/dec and DIBL (Drain Induced Barrier Lowering) is 51.3mV. Also, we have presented that TCAD simulator is suitable for device simulation.

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Stability Improvement of a V/f Controlled Induction Motor Drive System using a Dynamic Current Compensator (다이나믹 전류보상기를 이용한 V/f 제어 유도전동기 드라이브 시스템의 안정도 향상)

  • 정강률
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.53 no.6
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    • pp.402-408
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    • 2004
  • This paper proposes the novel V/f control method to improve the stability of a V/f controlled induction motor drive system. The conventional V/f control method used in the proposed V/f control method is a vector-based method that is slightly different from the existing conventional V/f control method. The proposed control method uses a dynamic current compensator to improve the stability of a V/f controlled induction motor drive system. This proposed method is easy to implement and completely eliminates the motor oscillation phenomenon causing the instability of a V/f controlled induction motor drive system, especially when the system is driven near the resonant frequency in steady-state with light load. Additionally, this paper analyzes theoretically the instability of a V/f controlled induction motor drive system and shows the validity of the Proposed V/f control method through simulation and experimental results.

A Study on V2V Communication Environment in K-city (자율주행 실험도시(K-city) 내 V2V 통신 환경에 관한 연구)

  • Jo, Byeongchan;Kim, Donghwan;Shin, Jaekon;Kim, Sungsub;Cho, Seongwoo
    • Journal of Auto-vehicle Safety Association
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    • v.13 no.1
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    • pp.26-30
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    • 2021
  • K-city is an experimental area for developing self-driving cars. V2X communications such as WAVE, C-V2X and 5G are an essential technology for autonomous driving above level 4. In this paper, the research on the V2V communication environment was carried out through BSM receiving level analysis on the driving route in K-city. A stationary vehicle communicated with a test vehicle moving along urban area and suburban road in two different scenarios. The communication range and receiving levels obtained from this study will be used to develop and verify various safety scenarios using V2V communication within K-city in the future.

Change of Volume of Isoflow in Pneumoconiosis Patients with Small Opacity (소음영 진폐증 환자에서의 등기류용량(Volume of Isoflow)의 변화)

  • Oh, Sang-Yong;Kim, Jee-Won;Jung, Chang-Young;Kim, Kyung-Ah;Yun, Im-Goung
    • Tuberculosis and Respiratory Diseases
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    • v.40 no.5
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    • pp.540-547
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    • 1993
  • Backgrounds: The measurement of volume of isoflow has been considered as a sensitive test for detecting small airway diseases showing normal pulmonary function in a routine pulmonary function test. To evaluate the functions of small airway among dust exposed workers, the changes of volume of isoflow were measured and its applicability of managing early stage pneumoconiosis patients was studied. Method: The subjects were 67 male, pneumoconiosis with small opacity and FEV1>80%, FEV1/FVC>75% in spirometry and the controls were 20 male, no dust-exposed office workers. The maximal epiratory volume curves after inhalation of indoor air and $He-O_2$ gas mixtures were measured and ${\Delta}V_{max50},\;{\Delta}V_{max75},\;V_{iso}V/VC$ between the dust exposed and control workers were compaired. Results: 1) There were no significant differences between two group in ${\Delta}V_{max50}$ and ${\Delta}V_{max75}$. But the ratio of $V_{iso}V/VC$ of the subjects was siginificantly higher than that of the control (p<0.01). This study confirms that $V_{iso}V/VC$ is a very useful index in early detection of small airway dysfunction. 2) The ratio of $V_{iso}V/VC$ of the subjects was signigicantly different between only smoker group and mixed group(smoker and nonsmoker). It suggestes that smoking is an important cousative factor of small airway dysfunction. 3) As the profusion of the chest X-ray increased, the rartio of $V_{iso}V/VC$ increased, but no significant difference of $V_{iso}V/VC$ was found between categories of pneumoconiosis. The categories of pneumoconiosis and small airway dysfunction may not be related. 4) No significant relationship was established between the duration of work and the ratio of $V_{iso}V/VC$. Conclusions : It is concluded that the measurement of $V_{iso}V/VC$ is useful to detect small airway dysfuction of early stage pnuemoconiosis patents with small opacities but showing normal pulmonary function in a routine pulmonary function test.

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Quality Characteristics of Salt-Fermented Anchovy Sauce and Sandlance Sauce (멸치액젓 및 까나리액젓의 품질 특성)

  • OH Kwang-Soo
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.32 no.3
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    • pp.252-255
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    • 1999
  • The quality characteristics of the Korean traditional salt-fermented fish sauces, the traditional anchovy sauce (TAS) and the sandlance sauce(TKS) were evaluated comparing to the commercial anchovy sauce (CAS) and sandlance sauce (CKS). The acidity was higher in TKS than in TAS, whereas the contents of VBN, total-N and amino-N were higher levels in TAS. In color values, L and b values in TAS were generally higher than those in TKS, whereas a and ${\Delta}E$ values were higher in TKS. The contents of total free amino acids in TAS and TKS were $12.40\;g\%$ (w/v) and $9.549 g\%$ (w/v), respectively. The contents or six amino acids, alanine, glutamic acid, leucine, isoleucine, valine and Iysine were higher in TAS, whereas the contents of arginine, glutamic acid, leucine, alanine and valine were higher in TKS. Nucleotides such as IMP and hypoxanthine were principal components in both TAS and TKS. The nitrogen related compounds, TMAO, TMA and total creatinine were determined to be $108.8\;mg\%$ (w/v), $60.5\;mg\%$ (w/v), $62.4\;mg\%$ (w/v) in TAS, and those in TKS were $60.1\;mg\%$ (w/v), $24.1\;mg\%$ (w/v), $67.6\;mg\%$ (w/v), respectively.

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