• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2006년도 제37회 하계학술대회 논문집 A
• /
• pp.339-340
• /
• 2006

현재 운영되고 있는 변동비반영전력시장(CBP)은 2001년 4월 개설되어 구조개편 초기의 혼란을 최소화하고 2004년으로 예정된 도매전력시장 운영되기 전까지의 과도기 운영을 목적으로 설계되었다. 이는 제한된 경쟁시장으로 전력시장의 효율성 제고와 안정적인 전력공급에 어느 정도 기여하였으며, 내재된 문제가 제기되어도 곧 도입될 차기 도매전력시장에서 개선하려고 하였다. 참여정부의 배전분할 중단결정에 따라 변동비반영전력 시장의 장기운영이 불가피해지게 되었고, 전력거래소는 배전분할 중단 발표직후인 2004년 7월부터 전력시장 제도개선 논의 시작하였으며, 2005년 말에는 개선방안 연구결과를 발표하였다. 본 논문에서는 연구결과인 개선방안과 이를 시행하기 위한 추진계획을 설명하고 있다.

• 한국수자원학회:학술대회논문집
• /
• 한국수자원학회 2008년도 학술발표회 논문집
• /
• pp.1388-1392
• /
• 2008

Water resources management depends on dealing inherent uncertainties stemming from climatic and hydrological inputs and models. Dealing with these uncertainties remains a challenge. Streamflow forecasts basically contain uncertainties arising from model structure and initial conditions. Recent enhancements in climate forecasting skill and hydrological modeling provide an breakthrough for delivering improved streamflow forecasts. However, little consideration has been given to methodologies that include coupling both multiple climate and multiple hydrological models, increasing the pool of streamflow forecast ensemble members and accounting for cumulative sources of uncertainty. The approach here proposes integration and coupling of global climate models (GCM), multiple regional climate models, and numerous hydrological models to improve streamflow forecasting and characterize system uncertainty through generation of ensemble forecasts.

• International Journal of Korean Welding Society
• /
• 제1권1호
• /
• pp.31-38
• /
• 2001

For the horizontal fillet welding with one plate in a vertical position, there will be a higher tendency of weld metal falling down rather than for the butt-welding in flat position. Such phenomenon could bring about the overlap or deflection of weld pool, and consequently induce the poor mechanical strength of weldments. Therefore, a precise position control of welding torch in conjunction with the weld qualify plays an important role in welding robot applications. In the present study, an experimental method was proposed for deriving a mathematical model between the leg length and the welding conditions. Finally, an algorithm was proposed for weld seam tracking and improvement of the weld quality. The reliability of the proposed algorithm was evaluated through various experiments, which showed that the proposed algorithm can be very effective for tracking the weld line and simultaneously achieving the sound weld bead.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2001년도 추계학술대회 논문집 전력기술부문
• /
• pp.170-172
• /
• 2001

This paper describes the settlement rules in the basic market design for Korean Wholesale Electricity Market. The settlement rules are to be exercised after the Bid and Offer Processes as described in the pool rules(within the market rules) and to determine the payments to Generators, charges to Energy Purchasers and charges or payments to the Transmission Asset Owner(TAO).

• Journal of Welding and Joining
• /
• 제31권4호
• /
• pp.42-46
• /
• 2013

The contact tip for flux cored arc welding has important functions to transmit the welding current to the wire and to guide the wire to molten pool. A damaged contact tip causes a productivity reduction and a welding quality problem. In this study, the welding experiments for the wear resistance of contact tip regarding flux cored wire types were performed. With two fold type and a seamless type flux cored wires, the wear rates of contact tips were compared. In addition, the wear rate was checked according to the contact tip position.

• KIEE International Transactions on Power Engineering
• /
• 제5A권2호
• /
• pp.199-203
• /
• 2005

This paper proposes the level of price cap in the TWBP(Two- Way Bidding Pool) market in Korea for which the draft of market design has been prepared by KPX. Max - GMCP(Maximum Generation Market Clearing Price) and APC(Administered Price Cap) would be separately applied as individual price caps for a normal period and a Price Capping period in TWBP. The level of price cap is determined for inducing optimal investment in the Korean Electricity Market considering the 'electricity resource baseline plan' published by the Korean government in 2002 for maintaining government-leading resource planning in Korea. In this regard, Max - GMCP is calculated from the equilibrium condition of investment based on reliability standard and fixed cost of the peaking plant. For verifying the propriety of the proposed price cap, this paper compares the proposed value with the estimated VoLL(Value of Lost Load) based on Korea's GDP(Gross Domestic Product).

• 대한임베디드공학회논문지
• /
• 제17권3호
• /
• pp.177-183
• /
• 2022

To measure the size and weight of the fish, we developed an automatic fish size measurement system using a deep neural network, where the YOLO (You Only Look Once)v3 model was used. To detect fish, an IP camera with infrared function was installed over the fish pool to acquire image data and used as input data for the deep neural network. Using the bounding box information generated as a result of detecting the fish and the structure for which the actual length is known, the size of the fish can be obtained. A GUI (Graphical User Interface) program was implemented using LabVIEW and RTSP (Real-Time Streaming protocol). The automatic fish size measurement system shows the results and stores them in a database for future work.

• Journal of Microbiology and Biotechnology
• /
• 제20권1호
• /
• pp.146-152
• /
• 2010

Streptomyces clavuligerus NRRL3585 produces a clinically important $\beta$-lactamase inhibitor, clavulanic acid (CA). In order to increase the production of CA, the glyceraldehyde-3-phosphate dehydrogenase (GAPDH) gene (gap) was deleted in S. clavuligerus NRRL3585 to overcome the limited glyceraldehyde-3-phosphate pool; the replicative and integrative expressions of ccaR (specific regulator of the CA biosynthetic operon) and claR (Lys-type transcriptional activator) genes were transformed together into a deletion mutant to improve clavulanic acid production. We constructed two recombinant plasmids to enhance the production of CA in the gap1 deletion mutant of S. clavuligerus NRRL3585: pHN11 was constructed for overexpression of ccaR-claR, whereas pHN12 was constructed for their chromosomal integration. Both pHN11 and pHN12 transformants enhanced the production of CA by 2.59-fold and 5.85-fold, respectively, compared with the gap1 deletion mutant. For further enhancement of CA, we fed the pHN11 and pHN12 transformants ornithine and glycerol. Compared with the gap1 deletion mutant, ornithine increased CA production by 3.24- and 6.51-fold in the pHN11 and pHN12 transformants, respectively, glycerol increased CA by 2.96- and 6.21-fold, respectively, and ornithine and glycerol together increased CA by 3.72- and 7.02-fold, respectively.

• 한국전통조경학회지
• /
• 제37권3호
• /
• pp.93-107
• /
• 2019

본 연구의 목적은 중국 전통원림 공간조영의 원리를 어떻게 현대공원에 접목시키며 전통원림 공간조영의 전승 및 창신의 방법을 탐구하는 것이다. 전조양 등은 '중국 고전원림 및 현대전역십오강(中國古典園林与現代轉譯十五講)'에서 중국 전통 원림은 시간과 공간이 결합된 원림이며, 간략(簡略)화된 기본 조영원리 모식도(模式圖)를 제시하였다. 제시된 공간구성원리에 따라 중국현대공원인 곡강지 유적공원에 전통 원림요소와 현대 원림요소를 어떻게 접목시켰는지와 이 요소들이 공원 공간에 표현된 방법을 탐구하였다. 연구 결과는 다음과 같다. 곡강지 유적공원의 복합형 공간은 공원 경계부와 복합형 동선으로 조영하였다. 공원경계부에 위치해 있는 원림 요소는 다리, 광장, 식물, 선형(線形)으로 배열된 건축물군집으로 구성하였다. 공원의 중심 수공간은 곡강지 옛 수계유적흔적에 따라 설계하였으며 공간의 중간 부분에 위치하고 구불구불한 자연적인 호안선으로 공간을 확장시키는 효과가 있다. 공원 수공간은 대지(大池)와 소지(小池)로 나눴으며 대지 내에 연파도(煙波島)를 설치하고 소지 안에 조도(鳥島)를 조영하였다. 공원 내에 있는 건축물들이 공원 동선의 볼록한(철각(凸角)) 부분에 위치하여, 공원 관람자의 호기심을 유발할 수 있는 위치에 배치하였기 때문에 시간과 공간을 확장하는 효과를 실현하였다. 본 연구 과정을 통해 곡강지 유적공원의 시간과 공간설계구성의 공간조영원리를 검증하였으며, 현대공원의 전체 공간 구조에 간략화 된 공간 설계 기법으로 원림의 복잡한 조합에 그 본질적인 공간구조가 나타난다. 또한, 곡강지 유적공원의 원림요소는 현대기법으로 진(秦)·한(漢)·수(隋)·당(唐)의 전통문화를 계승하고 곡강지 공원을 지역의 특색을 지니는 공간으로 재조영 하였으며, 당나라 문화를 주제로 하여 공간구성원리에 따라 시대별, 공간별 조영요소를 분석하였다. 본 연구를 통해 곡강지 유적공원은 제시된 공간조영원리가 적용된 공간이며, 중국 전통원림 공간 구성원리가 적용된 결과물이다. 그리고 곡강지 원림요소가 전통역사문화와 결합해서 창출된 경관은 현대 원림요소의 창신한 부분이다. 즉, 곡강지 유적공원은 중국의 특색있는 현대 원림으로 계승 및 창신 되었다.

• 대한핵의학회지
• /
• 제39권2호
• /
• pp.94-99
• /
• 2005

Electrocardiogram-gated single photon omission computed tomography (SPECT) provides valuable information in the assessment of both myocardial perfusion and ventricular function. Tl-201 is a suboptimal isotope for gating. Tl-201 images are more blurred compared with Tc-99m tracers due to the increased amount of scattered photons and use of a smooth filter. The average myocardial count densities are approximately one-half those of conventional technetium tracers. However, Tl-201 is still widely used because of its well-established utility for assessing myocardial perfusion, viability and risk stratification. Gated SPECT with Tl-201 enables us to assess both post-stress and rest left ventricular volume and function. Previous studies with gated Tl-201 SPECT measurements of ejection fraction (EF), end-diastolic volume (EDV), end-systolic volume (ESV) have shown high correlation with first-pass radionuclide angiography, gated blood pool scan, Tc-99m-MIBI gated SPECT, contrast ventriculography, echocardiography, and 3-dimensional magnetic resonance imaging. However, problems related to these studies include few agreement data of EDV and ESV, use of a reference method that is likely to have the same systemic errors (gated Tc-99m-MIBI SPECT), and other technical factors related to the count density of gated SPECT. With optimization of gated imaging protocols and more validation studies, gated Tl-201 SPECT would be an accurate method to provide perfusion and function information in patients with coronary artery disease.