• Title, Summary, Keyword: STEPwise

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A Study on Application of Stepwise Gate Signal for a-Si Gate Driver (a-Si Gate 구동회로의 Stepwise Gate 신호적용에 대한 연구)

  • Myung, Jae-Hoon;Kwag, Jin-Oh;Yi, Jun-Sin
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.21 no.3
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    • pp.272-278
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    • 2008
  • This paper investigated the a-si:H gate driver with the stepwise gate signal. In 1-chip type mobile LCD application the stepwise gate signal for low power consumption can be used by adding simple switching circuit. The power consumption of the a-Si:H gate driver can be decreased by employing the stepwise gate signal in the conventional circuit. In conventional one, the effect of stepwise gate signal can decrease slew rate and increase the fluctuation of gate-off state voltage, In order to increase the slew rate and decrease the gate off state fluctuation, we proposed a new a-Si:H TFT gate driver circuit. The simulation data of the new circuit show that the slew rate and the gate-off state fluctuation are improved, so the circuit can work reliably.

Experimental Study on Application of Multi-Stepwise TPSM (다단계 온도프리스트레싱 공법의 현장적용을 위한 실험적 연구)

  • Ahn, Jin-Hee;Kim, Jun-Hwan;Kim, Sang-Hyo;Lee, Sang-Woo
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.12 no.1
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    • pp.91-100
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    • 2008
  • Multi-stepwise Thermal Prestressing Method(TPSM) is a newly proposed prestressing method, which is combined the external prestressing method and the external bonding method. Multi-stepwise thermal prestressing force is induced by cooling process of cover-plate in the multi-stepwise temperature distribution after the cover-plate being bolted to the girder. In this study, the heating capacity test of the developed heating system for applying the multi-stepwise TPSM effectively and multi-stepwise TPSM inducing test of H-beam is performed. Also, a field test of the rhamen type temporary bridge is carried out to evaluate the effect and application of the multi-stepwise TPSM. Truck load was loaded and compared with the structure analysis results.

Stepwise Ni-silicide Process for Parasitic Resistance Reduction for Silicon/metal Contact Junction

  • Choi, Hoon;Cho, Il-Whan;Hong, Sang-Jeen
    • Transactions on Electrical and Electronic Materials
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    • v.9 no.4
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    • pp.137-142
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    • 2008
  • The parasitic resistance is studied to silicon/metal contact junction for improving device performance and to lower contact/serial resistance silicide in natural sequence. In this paper constructs the stepwise Ni silicide process for parasitic resistance reduction for silicon/metal contact junction. We have investigated multi-step Ni silicide on SiGe substrate with stepwise annealing method as an alternative to compose more thermally reliable Ni silicide layer. Stepwise annealing for silicide formation is exposed to heating environment with $5^{\circ}C/sec$ for 10 seconds and a dwelling for both 10 and 30 seconds, and ramping-up and the dwelling was repeated until the final annealing temperature of $700\;^{\circ}C$ is achieved. Finally a direct comparison for single step and stepwise annealing process is obtained for 20 nm nickel silicide through stepwise annealing is $5.64\;{\Omega}/square$ at $600\;^{\circ}C$, and it is 42 % lower than that of as nickel sputtered. The proposed stepwise annealing for Ni silicidation can provide the least amount of NiSi at the interface of nickel silicide and silicon, and it provides lower resistance, higher thermal-stability, and superior morphology than other thermal treatment.

Multi-Stepwise Prestressing Method of Steel Structure Using Thermal-Expanded Cover-plate (커버플레이트의 온도변형을 이용한 강구조물의 다단계 프리스트레싱)

  • Kim, Sang Hyo;An, Jin Hee;Kim, Jun Hwan;Kim, Hyung Ju
    • Journal of Korean Society of Steel Construction
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    • v.18 no.6
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    • pp.783-792
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    • 2006
  • This study investigates developments in a prestressing method using the thermal-expanded cover-plates that increases the load-carrying capacity of structures by installing it on upper or lower flanges in case that huge flexural stiffness according to the increase in span length or load are required of steel structure, such as rolled H-beam or built-up beam. This method applies multi-stepwise contraction forces generated by the contraction of cover plates as prestressing forces after joining the cover plate applied by multi-stepwise thermal expansion that was applied to induce prestressing to structures. To perform a theoretical investigation of the prestressing force applied to a structure due to the thermal expansion and induce a multi-stepwise prestressing method using multi-stepwise thermal distribution, this study proposes a theoretical heat transfer solution for the multi-stepwise thermal distribution of cover plates and analyzes the effect of a multi-stepwise prestressing method using the multi-stepwise thermal expansion.

A Study on DEA-based Stepwise Benchmarking Target Selection Considering Resource Improvement Preferences (DEA 기반의 자원 개선 선호도를 고려한 단계적 벤치마킹 대상 탐색 연구)

  • Park, Jaehun;Sung, Si-Il
    • Journal of the Korean Society for Quality Management
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    • v.47 no.1
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    • pp.33-46
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    • 2019
  • Purpose: This study proposed a DEA (Data Envelopment Analysis)-based stepwise benchmarking target selection for inefficient DMU (Decision Making Unit) to improve its efficiency gradually to reach most efficient frontier considering resource (DEA inputs and outputs) improvement preferences. Methods: The proposed method proceeded in two steps. First step evaluates efficiency of DMUs by using DEA, and an evaluated DMU selects benchmarking targets of HCU (Hypothesis Composit Unit) or RU (Real Unit) considering resource improvement preferences. Second step selects stepwise benchmarking targets of the inefficient DMU. To achieve this, this study developed a new DEA model, which can select a benchmarking target of an inefficient DMU in considering inputs or outputs improvement preference, and suggested an algorithm, which can select stepwise benchmarking targets of the inefficient DMU. Results: The proposed method was applied to 34 international ports for validation. In efficiency evaluation, five ports was evaluated as most efficient port, and the remaining 29 ports was evaluated as relative inefficient port. When port 34 was supposed as evaluated DMU, its can select its four stepwise benchmarking targets in assigning the preference weight to inputs (berth length, total area of pier, CFS, number of loading machine) as (0.82, 1.00, 0.41, 0.00). Conclusion: For the validation of the proposed method, it applied to the 34 major ports around the world and selected stepwise benchmarking targets for an inefficient port to improve its efficiency gradually. We can say that the proposed method enables for inefficient DMU to establish more effective and practical benchmarking strategy than the conventional DEA because it considers the resource (inputs or outputs) improvement preference in selecting benchmarking targets gradually.

EFFECT OF CONTINUOUS AND STEPWISE CHANGE IN DRYING TEMPERATURE ON DRYING CHARACTERISTICS AND PRODUCT QUALITY

  • Chua, K.J.;Mujumdar, A.S.;A Hawlader, M.N.;Chou, S.K.;Ho, J.C.
    • Proceedings of the Korean Society for Agricultural Machinery Conference
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    • pp.413-422
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    • 2000
  • Samples of banana were dried in a two-stage heat pump dryer capable of producing stepwise control of the inlet drying air temperature while keeping absolute humidity constant. Two stepwise air temperature profiles were tested. The incremental temperature step change in temperature of the drying air about the mean air temperature of 30 $^{\circ}C$ was 5 $^{\circ}C$. The total drying time for each temperature-time profile was about 300 minutes. The drying kinetics and color change of the products dried under these stepwise variation of the inlet air temperature were measured and compared with constant air temperature drying. The stepwise air temperature variation was found to yield better quality product in terms of color of the dried product. Further, it was found that by employing a step-down temperature profile, it was possible to reduce the drying time to reach the desired moisture content.

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Enhancement of Immune Activity of the Extracts from Codonopsis lanceolata by Stepwise Steaming Process and High Pressure Process (증숙 및 초고압 증숙 공정을 통한 더덕의 면역활성 증진)

  • Kim, Nam Young;Chung, Jae Youn;Lee, Hyeon Yong
    • Korean Journal of Medicinal Crop Science
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    • v.22 no.2
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    • pp.134-139
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    • 2014
  • This study was to investigate the improvement of immune activities of the extracts from Codonopsis lanceolata by stepwise steaming process and high pressure process. The phenol contents was $8.742{\mu}g/mg$ which was higher than that from conventional extraction using 70% ethyl alcohol at $80^{\circ}C$ for 24 hours. All of extracts at a concentration of $1.0mg/m{\ell}$ showed relatively low cytotoxicity on human normal kidney cell (HEK293) in range of 16 19%. The immune B and T cell growth was improved by extracts using the steamed and high pressure precess of C. lanceolata up to $180{\times}10^4cells/m{\ell}$ and $96{\times}10^4cells/m{\ell}$, respectively. The extract prepared also greatly increased the secretion of both IL-6 and TNF-${\alpha}$ from the stepwise steamed and high pressure process. This results can conclude that stepwise steamed and high pressure process effectively released active biomaterials which could important role in enhancing immune activity in the body.

Admissibility of Some Stepwise Bayes Estimators

  • Kim, Byung-Hwee
    • Journal of the Korean Statistical Society
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    • v.16 no.2
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    • pp.102-112
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    • 1987
  • This paper treats the problem of estimating an arbitrary parametric function in the case when the parameter and sample spaces are countable and the decision space is arbitrary. Using the notions of a stepwise Bayesian procedure and finite admissibility, a theorem is proved. It shows that under some assumptions, every finitely admissible estimator is unique stepwise Bayes with respect to a finite or countable sequence of mutually orthogonal priors with finite supports. Under an additional assumption, it is shown that the converse is true as well. The first can be also extended to the case when the parameter and sample space are arbitrary, i.e., not necessarily countable, and the underlying probability distributions are discrete.

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Effects of Cryoprotectants and Freezing Rates on Cryopreservation of Catfish, Silurus asotus Sperm

  • Kho, Kang Hee;Kang, Kyoung Ho
    • Journal of Aquaculture
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    • v.17 no.1
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    • pp.8-11
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    • 2004
  • Milt of the catfish was stripped into immobilizing solution containing 175 mM NaCl and 30 mM Tris at pH 7.8 and was successfully cryopreserved after a stepwise freezing procedure. After stepwise thawing, motility of spermatozoa was slightly lower than that of fresh sperm. Batches of 40-80 eggs were fertilized with cryopreserved spermatozoa, after thawing and activation in solution containing 50 mM NaCl, 20 mM Tris and HCl at pH 7.8; this resulted in 62.2% fertilization success, compared to 70.6 % with fresh sperm.

The Relationship between Daily Peak Load and Weather Conditions Using Stepwise Multiple Regression (Stepwise 다중회귀분석을 이용한 최대전력수요와 기상과의 상관관계 분석)

  • Cha, Jiwon;Lee, Donggun;Kim, Hyeonjin;Joo, Sung-Kwan
    • Proceedings of the KIEE Conference
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    • pp.475-476
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    • 2015
  • 전력수요는 다양한 외부요인으로부터 영향을 받으므로 전력수요 예측 시 각 요인과의 상관관계를 고려할 필요가 있다. 본 논문은 Stepwise 다중회귀분석법을 이용한 일일 최대전력수요 예측 방법을 제시하였다. 사례연구에서는 2014년 평일 전력수요데이터를 이용하여 제안된 예측방법을 적용하고 그 결과를 평가하였다.

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