• 제목/요약/키워드: Looper

검색결과 48건 처리시간 0.023초

열연 사상압연공정 스탠드간 열연판속도 측정시스템 적용연구 (Application of a Strip Speed Measurement for Hot Strip Rolling)

  • 홍성철;최승갑
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 2000년도 제15차 학술회의논문집
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    • pp.212-212
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    • 2000
  • This study was performed to construct a hot strip speed measuring system and check over whether the measured speed can be used for improving the mass flow of the head-end part of a hot strip in the 7-stand finishing mill. Because the mass flow in hot rolling mill affects the looper operation and the thickness and width control of a strip, accurate measurement of strip speed ie important. The measured speed was compared with the roll speeds of No. 6 and No.7 stand to check the performance of the system and analyzed to find how to apply the speed. As a result, it is shown that the accuracy of the system is enough, strip thickness error can be reduced by -275∼+200$\mu\textrm{m}$ using the measured speed and the existing FSU model has low accuracy for predicting forward slip rate. A neural network was developed to calculate forward slip rate instead of FSU model. The test result of the neural network shows that the neural network is more accurate than the FSU model.

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Baculovirus 벡터내 재구성된 유전자의 전이와 발현 (Transfection and Expression of Reconstructed Genes within Baculoviral Vectors)

  • 사영희;최창식;이기환;홍성갑
    • 한국정보통신학회:학술대회논문집
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    • 한국정보통신학회 2018년도 춘계학술대회
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    • pp.588-591
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    • 2018
  • Baculovirus는 원래 알팔파 루퍼 (looper)로부터 분리되었으며 154 개의 오픈 리딩 프레임 (ORF)을 가진 134-kbp 게놈을 포함하고 있다. 주요 캡시드 단백질 VP39는 약간의 단백질과 함께 p6.9 단백질로 DNA를 감싸는 뉴클레오 캡시드($21nm{\times}260nm$)로 형성된다. 그것들은 막대 모양의 캡시드 안에 이중 가닥의 고리 모양의 슈퍼 코일 DNA 분자이다. 야생형 baculovirus는 용균 및 폐색 된 생명주기를 모두 나타내며 바이러스 복제의 3 단계에 걸쳐 독립적으로 발달한다. 재조합 baculovirus는 광범위한 포유류 세포 유형에서 벡터를 전달하고 재조합 단백질을 발현 할 수 있다. 특히, 이들 baculovirus 벡터에 우세한 선별 마커를 포함시킴으로써 많은 세포에서 다양한 재조합 유전자를 발현시킬 수 있다. 본 연구의 배큘로 바이러스 벡터는 cytomegalovirus (CMV) 프로모터, uroplakin II promoter, polyhedron promoter, 수포 구내염 바이러스 G (VSVG), 녹색 형광 단백질 (EGFP), 단백질 전달 도메인 (PTD) 유전자 등으로 재구성되었다. 이러한 재구성 된 벡터를 다양한 세포 및 세포주에 감염시켰다. 우리는 다른 재조합 벡터와 비교하여 이러한 재조합 벡터의 전이 및 발현을 조사하는 수행하였다. 본 연구에서, 우리는 이 재조합 벡터의 형질 감염 및 발현이 어떤 대조군 벡터보다 더 높은 효능을 갖는다는 것을 알았다. 본 연구는 과학 기술부, 한국 정보 기술 진흥 기금 (MSIP)이 후원하는 한국 연구 재단 (NRF)을 통해 중견 연구원 프로그램 (NRF-2016R1A2B4016552)을 통해 지원되었다.

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열간압연 공정 해석용 시뮬레이터의 개발과 응용(I) (Development of Hot Rolling Process Analysis Simulator and Its Application(I))

  • 이원호;이상룡
    • 소성∙가공
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    • 제8권1호
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    • pp.65-77
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    • 1999
  • In recent years, the quality requirements from the customers of hot rolled steel strip have been steadily increasing in diversity and strictness. To meet these quality requirements as well as to improve productivity, steel mills have been doing their efforts for developing high performance Automatic Gauge Control (AGC) system. However, it is very time consuming and also needs a lot of money to develop the new technologies of AGC in actual mill. So, there has been a demand for developing the Dynamic Hot Rolling Simulator since late 80's. It is a kind of software packages and can analyze the dynamic behaviors of hot finishing rolling process without laborious experiments in actual mill. It can also be used as a designing tool of Automatic Gauge Controller. In this work, the Dynamic Hot Rolling Simulator which is applicable to 6 sands hot strip mill rolling was developed. The MATLAB with SIMLINK was used as a software developer for making the main part of simulator because it is very powerful tool for modeling, integrating, controller design, and simulation. In this paper, the structures and the mathematical models of the simulator were briefly described and the results of simulation on the transient phenomena of hot rolling process with actual mill data were also presented.

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모델규명법에 기초한 열간 사상압연 선진율 학습모델 (A Learning Model of Forward Slip Ratio Based on Model Identification in Hot Strip Finishing Mill Process)

  • 황이철;김신일
    • 대한기계학회논문집A
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    • 제41권1호
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    • pp.63-68
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    • 2017
  • 이 논문에서는 열간 사상압연 공정에서 스트립 통판성의 안정성과 판 품질 향상을 위하여 새로운 선진율 학습모델 개발에 관한 연구를 수행한다. 먼저 기존의 선진율 해석모델에 대한 고찰을 통해 스트립 장력, 루퍼 각도 그리고 롤 주속이 선진율 학습에 크게 영향을 미치는 주요 압연 인자들임을 보인다. 두 번째로는 선진율 학습의 주요 압연 인자들을 이용하여 새로운 선진율 학습모델을 도출한 후, 보조변수 규명 알고리즘을 이용하여 이산시간계 학습모델을 규명한다. 끝으로 컴퓨터 시뮬레이션을 통해 이 논문에서 제안한 새로운 학습모델이 기존의 학습모델보다 유용함을 보인다.

Morphological, Phylogenetic and Biological Characteristics of Ectropis obliqua Single-Nucleocapsid Nucleopolyhedrovirus

  • Ma Xiu-cui;Xu Hai-Jun;Tang Mei-Jun;Xiao Qiang;Hong Jian;Zhang Chuan-Xi
    • Journal of Microbiology
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    • 제44권1호
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    • pp.77-82
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    • 2006
  • The tea looper caterpillar, Ectropis obliqua, is one of the major pests of tea bushes. E. obliqua single-nucleocapsid nucleopolyhedrovirus (EcobSNPV) has been used as a commercial pesticide for biocontrol of this insect. However only limited genetic analysis for this important virus has been done up to now. EcobSNPV was characterized in this study. Electron microscopy analysis of the occlusion body showed polyhedra of 0.7 to $1.7\;{\mu}m$ in diameter containing a single nucleocapsid per envelope of the virion. A 15.5 kb genomic fragment containing EcoRI-L, EcoRI-N and HindIII-F fragments, was sequenced. Analysis of the sequence revealed that the fragment contained eleven potential open reading frames (ORFs): lef-1, egt, 38.7k, rrl, polyhedrin, orfl629, pk-1, hoar and homologues to Spodoptera exigua multicapsid NPV (SeMNPV) ORFs 15, 28, and 29. Gene arrangement and phylogeny analysis suggest that EcobSNPV is closely related to the previously described Group II NPV. Bioassays on lethal concentration $(LC_{50}\;and\;LC_{90})$ and lethal time $(LT_{50}\;and\;LT({90})$ were conducted to test the susceptibility of E. obliqua larvae to the virus.

Quantitative Polymerase Chain Reaction for Microbial Growth Kinetics of Mixed Culture System

  • Cotto, Ada;Looper, Jessica K.;Mota, Linda C.;Son, Ahjeong
    • Journal of Microbiology and Biotechnology
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    • 제25권11호
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    • pp.1928-1935
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    • 2015
  • Microbial growth kinetics is often used to optimize environmental processes owing to its relation to the breakdown of substrate (contaminants). However, the quantification of bacterial populations in the environment is difficult owing to the challenges of monitoring a specific bacterial population within a diverse microbial community. Conventional methods are unable to detect and quantify the growth of individual strains separately in the mixed culture reactor. This work describes a novel quantitative PCR (qPCR)-based genomic approach to quantify each species in mixed culture and interpret its growth kinetics in the mixed system. Batch experiments were performed for both single and dual cultures of Pseudomonas putida and Escherichia coli K12 to obtain Monod kinetic parameters (μmax and Ks). The growth curves and kinetics obtained by conventional methods (i.e., dry weight measurement and absorbance reading) were compared with that obtained by qPCR assay. We anticipate that the adoption of this qPCR-based genomic assay can contribute significantly to traditional microbial kinetics, modeling practice, and the operation of bioreactors, where handling of complex mixed cultures is required.

A Self-Tuning PI Control System Design for the Flatness of Hot Strip in Finishing Mill Processes

  • Park, Jeong-Ju;Hong, Wan-Kee;Kim, Jong-Shik
    • Journal of Mechanical Science and Technology
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    • 제18권3호
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    • pp.379-387
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    • 2004
  • A novel flatness sensing system which is called the Flatness Sensing Inter-stand Looper(FlatSIL) system is suggested and a self-tuning PI control system using the FlatSIL is designed for improving the flatness of hot strip in finishing mill processes. The FlatSIL system measures the tension along the direction of the strip width by using segmented rolls, and the tension profile is approximated through the tension of each segmented roll. The flatness control system is operated by using the tension profile. The proposed flatness control system as far as the tension profile-measuring device works for the full strip length during the strip rolling in finishing mills. The generalized minimum variance self-tuning (GMV S-T) PI control method is applied to control the flatness of hot strip which has a design parameter as weighting factor for updating the PI gains. Optimizing the design parameter in the GMV S-T PI controller, the Robbins-Monro algorithm is used. It is shown by the computer simulation and experiment that the proposed GMV S-T PI flatness control system has better performance than the fixed PI flatness control system.

인공사료를 이용한 네눈쑥가지나방(Ascotis selenaria)(나비목: 자나방과) 실내 사육법 (Rearing Method for Ascotis selenaria (Lepidoptera: Geometridae) using an Artificial Diet)

  • 최경산;박영미;김동순
    • 한국응용곤충학회지
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    • 제50권1호
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    • pp.55-63
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    • 2011
  • 본 연구는 감귤에 발생하는 해충인 네눈쑥가지나방의 실내 사육용 인공사료를 개발하고자 수행하였다. 인공사료의 주 재료로 옥수수와 메주콩을 조합한 사료에서만 정상적으로 발육하였으며, 옥수수와 메주콩의 전체 함량이 높은 사료에서 유충 생존성이 높았다. 효모와 콜레스테롤을 인공사료에 첨가하였을 때, 유충 발육기간은 짧아지고, 생존율은 높은 것으로 나타났다. 발육기간, 누적 생존율, 산란량에 차이는 인공사료와 감귤 잎을 먹은 개체들 간에 없었다. 최종적으로 네눈쑥가지나방 사육에 최적인 인공사료 조성은 물 1 L당 한천 25 g, 옥수수 100 g, 메주콩 100 g, 효모 30 g, 콜레스테롤 0.5 g, 비타민혼합물(Vanderzant vitamin mix.) 2 g, 염혼합물(Wesson's salt mix.) 2 g, 소르브산 2 g, 메틸파라벤(methyl-4-hydroxybenzoate) 2.5 g, 아스코르브산 2 g이었다. 사육법으로 유충은 플라스틱 원형용기(${\varphi}90{\times}40$ mm) 안에서, 갓 부화 유충부터 4령까지는 40마리씩 집단으로, 5령과 6령은 개체별 사육하였다. 성충들에는 10% 설탕물을 먹이로 하여 플라스틱 상자 안($25{\times}25{\times}25$ cm)에서 암컷 3마리와 수컷 5~6마리가 교미하도록 했고, 난괴는 거즈(눈 크기 1 mm)를 붙인 기름종이에 받았다. 기타 인공사료로 사육한 네눈쑥가지나방의 발육단계별 형태적 특징에 대하여 기술하였다.