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고재섭(Jae-Sub Ko),최정식(Jung-Sik Choi),정병진(Byung-Jin Jung),김도연(Do-Yeon Kim),박기태(Ki-Tae Park),최정훈(Jung-Hoon Choi),정동화(Dong-Hwa Chung) 한국조명·전기설비학회 2007 한국조명·전기설비학회 학술대회논문집 Vol.2007 No.11월
This paper presents the photovoltaic(PV) water pumping system with a maximum power point tracking(MPPT). The water pumping system uses a variable speed single phase induction motor(SPIM) driven a centrifugal pump by field oriented control(FOC) inverter. The MPPT using a DC-DC converter controlled the duty cycle to track maximum power from PV under different insolation conditions. The duty cycle directly relate with a flux producing current control(i<SUB>ds</SUB>). The FOC inverter uses a current control voltage source inverter(CC-VSI). The simulation results are shown that the characteristics and performance of drive system, which varies as each conditions of light by expresses in voltage(V<SUB>dq</SUB>), current(I<SUB>dq</SUB>), speed of motor and torque.
IPMSM 드라이브의 최대토크를 위한 적응 FNN 제어기
김도연(Do-Yeon Kim),고재섭(Jae-Sub Ko),최정식(Jung-Sik Choi),정병진(Byung-Jin Jung),박기태(Ki-Tae Park),최정훈(Jung-Hoon Choi),정동화(Dong-Hwa Chung) 한국조명·전기설비학회 2007 한국조명·전기설비학회 학술대회논문집 Vol.2007 No.11월
Interior permanent magnet synchronous motor(IPMSM) has become a popular choice in electric vehicle applications, due to their excellent power to weight ratio. This paper proposes maximum torque control of IPMSM drive using adaptive fuzzy neural network controller and artificial neural network(ANN). This control method is applicable over the entire speed range which considered the limits of the inverter's current and voltage rated value. For each control mode, a condition that determines the optimal d-axis current i<SUB>d</SUB> for maximum torque operation is derived. This paper considers the design and implementation of novel technique of high performance speed control for IPMSM using Adaptive-FNN controller and ANN controller. The hybrid combination of neural network and fuzzy control will produce a powerful representation flexibility and numerical processing capability. Also, this paper proposes speed control of IPMSM using Adaptive-FNN and estimation of speed using ANN controller. The back propagation neural network technique is used to provide a real time adaptive estimation of the motor speed. The proposed control algorithm is applied to IPMSM drive system controlled Adaptive-FNN and ANN controller, the operating characteristics controlled by maximum torque control are examined in detail. Also, this paper proposes the analysis results to verify the effectiveness of the Adaptive-FNN and ANN controller.
High-throughput screening of protein variations in soybean seeds.
Vijayanand Velusamy,Kyung Jun Lee,Bo-Keun Ha,Jin Baek Kim,Sang Hoon Kim,Si-Yong Kang,Dong Sub Kim 한국육종학회 2012 한국육종학회 심포지엄 Vol.2012 No.07
The protein in soybean seeds accounts for approximately 40% of the dry seed weight. Two major storage proteins, 7S and 11S, constitute 70-80% of the total storage proteins in the seeds. In this study, the variation of total soluble protein extracts from 1152 soybean landraces that have been collected from South Korea were studied using high-throughput screening method with HT Protein Express Labchip (Caliper Life Sciences, Inc.). Seven distinct protein band patterns - four protein sub-units of 11S and three sub-units of 7S, were taken into account and their presence or absence were analyzed. Among the 1152 landraces, 525 genotypes were identified as lacking lipoxygenase, 255 lacking α1 subunit, 680 lacking α subunit, 169 lacking β subunit, 140 lacking acidic, 114 lacking Kunitz Trypsin Inhibitor (KTi) and 199 lacking basic protein patterns. The high-throughput protein analysis is helpful in screening a large number of populations with less time and minimum labor. The selected genotypes with low amounts or lacking of anti-nutritional factors such as trypsin inhibitor, lipoxygenase and α subunit would be used for future breeding purpose of quality improvement in soybean protein.
정상 백서 및 담즙성 간경변증을 유발시킨 백서에서 간문맥 결찰시 간장변화에 관한 실험적 연구
채권묵,송훈섭,소병준,문형배 圓光大學校 醫科學硏究所 1996 圓光醫科學 Vol.12 No.2
Portal vein branch ligation has been implicated to stimulate the hypertrophy of the unaffected lobe of the liver, but it has been suggested that the degree of the hypertrophy of the cirrhotic liver would be less than that of the normal liver. So, we tried to induce biliary cirrhotic liver by ligation of the common bile duct for this experiment and to evaluate the difference of the effect of the portal vein ligation among the different experimental rat liver groups. For the experimental study, we used Sprague - Dawley rats which were classified into the two groups. Group A (N = 16): Rats with portal venous branch ligation only. Group B (N=16): Rats with portal venous branch ligation after biliary cirrhosis were made by common bile duct ligation. In order to induce biliary cirrhosis, we ligated the common bile duct ligation in 135 rats and exploratory laparotomy for biopsy was done 3 weeks later after common bile duct ligation and the incidence of biliary cirrhosis was about 40%(54/135). 16 rats with the biliary cirrhotic liver were chosen for further study and one of 5 portal branches was ligated and the rats were sacrificed at different time point(1st, 3rd, 5th, 8th week) after initiation of the experiment, and the livers were removed and examined to find out the gross and histologic changes of the livers. The same procedures were performed in 16 normal rats for control study. In the Group A, the severe inflammatory changes and multiple necrotic foci were shown in the ligated lobe from the 3rd week, and firm nodularity was palpated but hypertrophic changes were not noticed in the unaffected lobe. In the group B, ligated lobe showed the same findings with the group A, but unaffected lobe did not reveal any specific findings. In our experiment, we could induce biliary cirrhosis after common bile duct ligation but we could not examine any hypertrophic changes in the both groups-normal and cirrhotic livers - after portal vein branch ligation. This might suggest that only small portion of necrosis - less than 20% - can not induce compensatory hypertrophy in the unaffected lobe.
구조적 서명 검증에서의 참조 서명의 데이터 크기 고정화 기법
이이섭,김성훈,Lee, Lee-Sub,Kim, Seong-Hoon 한국정보통신학회 2010 한국정보통신학회논문지 Vol.14 No.6
구조적 접근방법에 의한 서명검증은 서명을 부분획 단위의 집합 구조로 표현하여 서명 데이터를 분석하기 때문에 서명의 국부적인 변화의 특성을 효율적으로 흡수하여 우수한 검증 효과를 나타낸다. 그러나 이 방법은 실용화할 때 데이터의 크기가 고정되지 않는 문제가 발생한다. 이 논문에서는 이 문제를 해결하기 위하여, 상대적으로 중요한 부분을 선택하여 데이터를 고정크기로 만듦으로서 데이터의 크기를 줄이는 방법을 제안한다. 실험 결과, 고정된 크기로 선택된 서브패턴에 대해서 국부적인 변화도와 복잡도에 의한 가중치를 적용한 결과, 더 좋은 검증율을 보였으며, 이 때 고정된 크기를 만들기 위한 최소 크기의 참조 모델의 서브패턴의 개수는 일정 갯수의 범위에서 적절히 고정될 수 있음을 보였다. The structural approach in the signature verification, representing a signature as a structural form of local primitives, shows an excellent performance since it counts in the local characteristics such as local variation, stroke complexity, and etc. However, this method has a problem of template data sizing which can not fix the number of subpatterns comprising a signature. In this paper, we proposed a new algorithm to reduce the signature data into a fixed size by selecting a fixed number of subpatterns which is considered as important parts. As a result, it shows more excellent performance when the fixed sized sub-patterns is applied with local weights extracted from variational characteristics and complexities in local part. And the number of subpatterns representing a signature reference model can be fixed under a certain number of segments determined appropriately.
黃大錫,李勳燮 건국대학교 1974 學術誌 Vol.17 No.1
The writer considers that there are about seven types in the combined management forms, i. e. macro-pyramid tripe, capital participation type, management participation type, umbrella type, industry ownership-offering type, international compound type, industry techinque-offering type. In general, should these combined management forms be introduced into this country, the international business activities will raise up the domestic standard of employment and promote the exportations. Besides, as the excellent techniques which the international enterprise posses will become familiar, they would not only favour the domestic enterprise with so many advantages, but alsocontribute to the efficiency of the management under the principle of competition. On the other hand, if we view the Korean enterprises in the economic and political phase, they will not only get rid of the financial pressure in paying the foreign debts, but also become to consider the national security as well as the effective share of the international market as indispensable problems. Thus, the Korean enterprise has found the factors through the combined management forms, which would solve these problems. However, if the combined enterprises would be looted as soundly as name and reality agree, the writer considers that the three promises, such as the prevention of economic dependency, obtainment of managing polder, and securing of markets and sources of supply, should be simultaneously achieved in the combined enterprise.
신부영,이훈복,이일희,신용섭 嶺南大學校 工業技術硏究所 1995 工業技術硏究所論文集 Vol.23 No.1
대량생산 체제에서 기계적 산화 공정을 응용하여 공기 분위기에서 광분해성 마스터 뱃치(M/B)를 제조하였다. 제조된 M/B가 40 중량 % 첨가된 광분해성 HDPE 얇은 필름을 인플레이션 법으로 제조하였다. 필름의 광분해성을 시험하기 위하여 필름을 옥외에 노출시켜 기계적 물성 및 필름의 화학적 변화를 FTIR을 사용하여 관찰했다. 생분해 실험은 인큐베이터 및 토양 매립 실험을 동시에 실시했다. 광분해성 필름을 옥외 태양광 노출을 각각 0, 14, 28, 42일간 수행한 후 미생물 배양 시험을 행했다. 미생물 배양 시험에서 필름의 표면에 미생물의 성장과 포자의 형성을 관찰할 수 있었고 옥외 노출 기간이 증가함에 따라 필름 표면에 미생물의 성장이 증대되는 것을 관찰했다. 토양에 매립된 필름에서도 약간의 화학적인 변화를 관찰할 수 있었다. Photodegradable commercial master batch(M/B) was prepared by using mechanical oxidation during melt mixing with high shear under air environment. High density polyethylene(HDPE) thin film containing 40 wt % photodegradable M/B was prepared by inflation film processing. The film was exposed to the sunlight to observe the photodegradability. The degradability of film was determined by the loss of tensile properties and degradation was characterized by FTIR spectroscopy. Biodegradation of exposed and unexposed film was investigated by microbiological test and soil burial test, respectively. Photodegradable film(P-1) was exposed for periods of 0, 14, 28, 42 days before being mixed with fungi. It was found that microorganisms(fungi) growth on the surface of film was augmented as sunlight exposed time increased. Soil buried film showed the chemical changes of matrix polymer.
A pre-dose biomarker Ccrn4l for predicting the susceptibility of cisplatin-induced hepatotoxicity
Da-Bin Hwang,Dong-Hoon Won,Yoo-Sub Shin,Shin-Young Kim,Changuk Kim,Jun-Won Yun 한국실험동물학회 2021 한국실험동물학회 학술발표대회 논문집 Vol.2021 No.7
Cisplatin-induced liver injury is one of the limitations of its use as an anti-cancer drug. In particular, individual differences in sensitivity to drug-induced liver injury (DILI) can lead to life-threatening situations. The purpose of this study is to discover which innate genetic factors determine diversity for susceptibility to DILI. Rats undergo a liver prebiopsy and a 3-week postoperative recovery period prior to cisplatin administration. Two days after administration of cisplatin, hepatotoxicity was confirmed through serum biochemical and histopathological analysis. Based on liver-related biochemical test results (ALT, AST, γGT), rats were sub-grouped into the Susceptible (top five) or Resistant (bottom five) group for RNA sequencing using the pre-collected liver samples. As a result, pre-dose 161 genes were differentially expressed between the susceptible and resistant groups. Among them, Ccrn4l, a clock-controlled gene included in the "rhythmic process", was inherently low in gene expression before drug administration in both cisplatin- and acetaminophen-susceptible animals. In addition, in the susceptible group, the innately low expression level of Ccrn4l was maintained even after cisplatin treatment with decreased antioxidants, increased nitration, and apoptosis. When checking the correlation between Ccrn4l, antioxidant catalase, and mitochondrial RNA in the liver, it was confirmed that they showed similar mRNA expression patterns according to individual circadian variation. Surprisingly, Ccrn4l knockdown WB-F344 cells prompted cisplatin-induced mitochondrial dysfunction, apoptosis, and decreased catalase activity. In conclusion, individual innate hepatic Ccrn4l level may be a novel factor affecting cisplatin-induced hepatotoxicity susceptibility by modulating mitochondrial and antioxidant functions.
김명희,이영재,강훈이,강동수,김해섭,배태진 여수대학교 1998 論文集 Vol.13 No.2
To improve the utilization of sea tangle, the processing conditions of extracts, such as kind of additives, particle size of a sample, sample to solvent ratio, extracting temperature and time were studied. Among five extracting methods used for sea tangle extraction, the optimal method was water extraction. The most appropriate particle size of sea tangle powder, extracting temperature and mixing ratio of sea tangle to water were 5 mesh, 60℃ and 1 to 13(w/v), respectively. The basis of solids yield in sea tangle extract, optimal extracting time was about 2 hours. The yield of soluble solids under above-mentioned conditions was 5.1%.
김명희,이영재,강훈이,강동수,김해섭,배태진 여수대학교 1998 論文集 Vol.13 No.2
This study was intended to raise solids yield in the sea tangle extract. Sea tangle extracted by additions of acetone, methyl alcohol, isopropyl alcohol and ethyl alcohol. Among four solvents used for sea tangle extraction, the optimal solvent was ethyl alcohol. The most appropriate method of sea tangle extraction was two-stage extraction, that extracted with addition of ethyl alcohol and residue was extracted with water(1:13, w/v). As the optimal conditions of ethyl alcohol were 25℃ and 70%, respectively. The basis of solids yield in sea tangle extract, optimal extracting time was about 1 hour. The yield of soluble solids under above-mentioned conditions was 18.2%. Drinking product was made by adding 0.1% citric acid, 2% sorbitol and 2% oligosaccharide to the sea tangle extract(Brix 10).