• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 A
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• pp.268-270
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• 2005

전력계통을 계획, 운영, 검토, 해석하는데 있어서 가장 필요한 OPF(Optimal Power Flow)는 현재 다방면에서 새로운 알고리즘과 많은 수리적 방법을 통하여 접근하고 있다. 이들의 기반이 되는 조류계산은 많은 신뢰성들을 얻었지만, 현재 실무자 중심으로 구성되고 직접적으로 적절한 발전배분 상태를 계산하는 부분에서는 일부 한계성이 나타나고 있다. 이에 대해서 계속된 반복계산에 의한 최적의 계통 발전 배분상태에 근접한 값을 제시할 수 있는 프로그램을 PSS/E의 IPLAN을 통하여 개발하였다.

• 대한전기학회논문지:전력기술부문A
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• 제48권6호
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• pp.683-691
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• 1999

In this paper, it is suggested that the selection method of optimal parameter of power system stabilizer(PSS) with robustness in low frequency oscillation for power system using Real Variable Elitism Genetc Algorithm(RVEGA). The optimal parameters were selected in the case of power system stabilizer with one lead compensator, and two lead compensator. Also, the frequency responses characteristic of PSS, the system eigenvalues criterion and the dynamic characteristic were considered in the normal load and the heavy load, which proved usefulness of RVEGA compare with Yu's compensator design theory.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 추계학술대회 논문집 학회본부 A
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• pp.122-124
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• 2000

This study is focused on developing a program which can edit different formats of power system data used by system operators PSS/E program, which has been widely used as a tool for power system analysis. Provides only a limited function of editing PSS/E input data. Considering that more and more power system analysers will be developed and applied for power system planning and operation in the near future, unified handling of multi-types of power system data format, such as conversion of one input data format into another, is indispensible. In this paper, a new power system data editor, functionally augmented from PSS/E editor, is introduced. The new editing program was developed in GUI environment for users to conveniently edit input data for EUROSTAG program without running several editors. Considerable savings in time and manpower are expected.

• 대한화학회지
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• 제30권3호
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• pp.289-295
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• 1986

전해질 고분자인 polyvinylsulfate(PVS) 및 polystyrenesulfonate(PSS) 존재하에서 나타나는 methylene blue(MB) 및 acridine orange(AO)의 metachromasy현상을 각각 분광학적 방법으로 연구하였다. P/D값의 변화에 따르는 meta-band의 특성적 변화는 stacking이론에 의하여 설명하였으며 PVS-dye계의 stacking효과는 PSS-dye계의 그것보다 더 강하였거 MB가 AO보다 더 강한 stacking효과를 나타냄을 발견하였다. 전에 제안한 바 있는 평면구조의 방향색소들이 수용액속에서 형성하는 dimer의 모형과 dimension을 근거로 고분자사슬 표면에 결합되어 있는 색소분자들의 stacking 모형을 제안하였으며 이 모형을 제안하였으며 이 모형은 여러 연구자들에 의하여 밝혀진 실험적 결과와 비교 검토한 결과 합리적임이 발견되었다.

• Reproductive and Developmental Biology
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• 제28권1호
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• pp.37-43
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• 2004

본 연구는 319두의 서로 다른 품종에서 PSE육을 생산하는 PSS 돼지 출현빈도를 조사하였다(Yorkshire 150; Landrace 89 and Duroc 80). PCR-RFLP법을 이용하여 돼지의 모근을 DNA sample로 사용하여, PCR로 증폭된 유전자는 Cfo I 제한 효소로 절단하여 종돈에 존재하는 ryanodine receptor (RYR 1) 돌연변이 유전자의 출현빈도를 조사한 결과를 요약하면 다음과 같다. 모근에서 추출한 DNA를 주형으로 한 Primary PCR을 수행한 결과 ryanodine receptor 유전자 중 659bp의 증폭산물을 얻었으며, second PCR을 수행한 결과에서는 522 bp의 증폭산물을 얻었다. 이 증폭산물은 porcine ryanodine receptor 유전자의 exon 영역 중 PSS를 유발하는 point mutation(C\longrightarrowT; Arg\longrightarrowCys) 부분을 포함하고 있으므로 Cfo I 제한효소에 의해 분석될 수 있으며, agarose gel 전기영동에 의하여 세 가지의 유전자형으로 분류할 수 있다. 정상 homotype(NN)은 두 개의 DNA band(439, 83bp)로 나타나며, 열성 homotype(nn)은 552 bp의 단일 밴드로 출현한다. 그리고 세 개의 밴드(522, 439 그리고, 83 bp)는 heterotype(Nn)의 잠재성 돼지로 표현된다. Yorkshire종에서는 정상돼지가 98.00%로 나타났으며, hetero 돼지는 2.00% 그리고, PSS돼지는 출현하지 않았다. Landrace 돼지에서는 정상돼지가 87.64%로 나타났으며, hetero 돼지와 PSS패지가 각각 11.24와 1.12%로 나타났으나, Duroc종에서는 정장돼지(NN)만이 출현하였다. 대립 유전자 빈도는 Yorkshire종은 정상 N유전자가 0.990의 비율로 나타났으며, 열성 n 유전자는 0.010의 비율로 출현하였으며, Landrace종에서는 N유전자와 n유전자가 각각 0.933과 0.067의 빈도로 출현하였으며, Duroc종에서는 N 유전자의 빈도가 1.000의 빈도로 나타났으나, n유전자의 빈도는 0.000의 빈도로 나타났다. 3품종 집단 모두에서 Hardy-Weinberg 법칙과 일치하여 유전적 평형을 이루고 있었다.

• Asian-Australasian Journal of Animal Sciences
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• 제12권2호
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• pp.244-252
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• 1999

Intensive selection for muscle development and against fat deposition in pigs during the last 50 years has contributed to the increased incidence of porcine stress syndrome (PSS) and pale soft exudative pork (PSE). Genetics, nutrition and management, preslaughter animal handling, stunning, dehairing and carcass chilling influence the incidence and magnitude of the PSE condition. The normal incidence of PSE has been reported to range from 10 to 30%, but in some isolated instances is up to 60%. The elimination of halothane-positive pigs in breeding programs has reduced PSS and PSE. Further improvements in meat quality by terminal sire evaluation and selection can be achieved within halothane-negative populations because around 20% of the variation in meat color and water binding capacity seems to be genetically related. Pre-slaughter handling on the farm, during transit to the packing plant and at the packing plant can greatly influence the meat quality, contributing 10 to 25% of the variation. An effective stunning method, skinning instead of scalding/dehairing and rapid post-slaughter chilling further reduce the incidence of PSE pork. In addition to proper care and handling a carcass-merit based marketing system, that reflected the value differential between desirable and undesirable meat quality in the pricing system for pigs, would provide a great incentive to change pork production systems in order to improve meat quality, thus improving the image and usefulness of pork as food.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 하계학술대회 논문집 A
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• pp.181-183
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• 2003

This paper presents an operator training simulator for power system restoration against massive black-out. The system is designed especially focused on the generality and convenient setting up for initial condition of simulation. The former is accomplished by using on line calculation methodology, and PSS/E data is used to define the initial situation. The proposed simulator consists of three major components - the Power flow(PF) module, data conversion(CONV) module and CUI subsystem. PF module calculates power flow, and then checks overvoltage of buses and overflow of lines. CONV module composes an Y-Bus array and a data base at each restoration action. The initial Y-Bus array is constructed from PSS/E data. The user friendly GUI module is developed including graphic editor and built-in operation manual. As a result, the maximum processing time for one step operation is 15 seconds, which is adequate for training purpose. Comparison with PSS/E simulation proves the accuracy and reliability of the training system.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 추계학술대회 논문집 전력기술부문
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• pp.294-296
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• 2003

본 논문에서는 우리나라 7개 지역의 시송전 선로를 구성하여 전력계통안정화장치(Power System Stabilizer)의 특성을 분석한다. Black start 발전기의 전력은 각 지역의 시송전 경로를 통하여 우선공급발전기에 공급한다. 이는 한국전력거래소(KPX)에서 규정하고 있으며, 주선로와 예비선로로 구성되어 있다. PSS의 성능 분석은 PSS1A type을 부착하여 수행하였다. 시뮬레이션 패키지는 EMTDC를 사용하여 그 특성을 검토하였다.

• 한국GIS학회:학술대회논문집
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• 한국GIS학회 1999년도 추계학술대회 발표요약문
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• pp.21-25
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• 1999

Planning support systems(PSS) add more advanced spatial analysis functions than Geographic information systems(GIS) and intertemporal functions to the functions of spatial decision support systems(SDSS). This paper reports the continuing development of a PSS providing a framework that facilitates urban planners and civil engineers in conducting coherent deliberations about planning, design and operation & maintenance(O&M) of water-distribution networks for urban growth management. The PSS using dynamic optimization model, modeling-to-generate-alternatives, value engineering(VE) and life-cycle cost(LCC) can generate network alternatives in consideration of initial cost and O&H cost. Users can define alternatives by the direct manipulation of networks or by the manipulation of parameters in the models. The water-distribution network analysis model evaluates the performance of the user-defined alternatives. The PSS can be extended to include the functions of generating sewer network alternatives, combining water-distribution and sewer networks, eventually the function of planning, design and O&H of housing sites. Capacity expansion by the dynamic water-distribution network optimization model using MINLP includes three advantages over capacity expansion using optimal control theory(Kim and Hopkins 1996): 1) finds expansion alternatives including future capacity expansion times, sizes, locations, and pipe types of a water-distribution network provided, 2) has the capabilities to do the capacity expansion of each link spatially and intertemporally, and 3) requires less interaction between models. The modeling using MINLP is limited in addressing the relationship between cost, price, and demand, which the optimal control approach can consider. Strictly speaking, the construction and O&M costs of water-distribution networks influence the price charged for the served water, which in turn influence the. This limitation can be justified in rather small area because price per unit water in the area must be same as that of neighboring area, i.e., the price is determined administratively. Planners and engineers can put emphasis on capacity expansion without consideration of the relationship between cost, price, and demand.

• 대한수의학회지
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• 제42권1호
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• pp.65-71
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• 2002

We have utilized the PCR-RFLP method to detect the ryanodine receptor(RYR1) gene mutation and to estimate the genotype frequencies of the RYR1 gene in commercial crossbred pig population. The exon region(659bp) including point mutation(C ${\rightarrow}$T; Arg ${\rightarrow}$Cys) in the porcine ryanodine receptor gene, which is a causal mutation for PSS, was amplified by PCR and digested with Cfo I restriction enzyme. The RYR1 gene was classified into three genotypes by agarose gel electrophoresis. The normal homozygous(NN) individuals showed two DNA fragments consisted of 493 and 166bp. The mutant homozygous(nn) individuals showed only one DNA fragment of 659bp. Also, all three fragments(659, 493 and 166bp) were showed in heterozygous(Nn) carrier animals. The proportions of normal, carrier and PSS pigs within crossbred population of pigs were 81%, 15% and 4%, respectively. According to the results of analysis of variance for the association of genotypes of RYR1 of pigs at 30kg, day age at 90kg and average daily gains, the RYR1 nn genotype was very higher than RYR1 NN genotype for day age at 30kg with 5% level of significant difference, but no significant difference for association of any other genotypes with day age at 90kg and average daily gain in crossbred pigs. Therefore, DNA diagnosis by using PCR-RFLP analysis for the PSS gene was useful for large-scale screening of commercial pigs in the swine industry.