• 한국신재생에너지학회:학술대회논문집
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• 2011.11a
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• pp.140.2-140.2
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• 2011

Renewable energy(RE) systems have difficulties in operating and management due to the intermittency of the energy generation. Stochastic supply profiles of RE creates problems for mechanical and electrical design in relation to the selection of technology types and capacities of RE to be installed. This paper presents an methodology of the feasibility assessment of RE-integrated energy systems on the basis of hourly demand/supply analysis tools. Also, this paper shows the feasibility and the usefulness of GS REMA(Renewable Energy Matching Analysis) and HOMER by comparing actual energy data.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.25 no.3
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• pp.182-186
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• 2012

Resistance-change Random Access Memory(ReRAM) memory, which utilizes electrochemical control of metal in thin films of solid electrolyte, shows great promise as a future solid state memory. The technology utilizes the electrochemical formation and removal of metallic pathways in thin films of solid electrolyte. Key attributes are low voltage and current operation, excellent scalability, and a simple fabrication sequence. In this work, we investigated the nature of thin films formed by photo doping of $Ag^+$ ions into chalcogenide materials for use in solid electrolyte of Resistance-change RAM devices and switching characteristics according to field-effect.

• Journal of Environmental Impact Assessment
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• v.30 no.5
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• pp.328-338
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• 2021

EIA consultation is a final decision-making process that enables a variety of stakeholders to participate in and to share important information about the expected environmental impacts caused by development projects. However, this process is often undermined through re-consultation processes by significant changes in the proposed plans. EIA re-consultation is a necessary process when an approved plan needs to be changed for a variety of importantreasons including the changes of land use, delay of construction, and surrounding environments. EIA re-consultation is also important to resolve conflicts among stakeholders and to respond flexibly to unexpected changes in surrounding environment. This study aims to analyze the operation status and the problems of current institutional systems of EIA re-consultation, and to draw implications by reviewing institutional systems of other countries such as U.S. EU, Scotland, and Japan. On the basis of the previous analysis, we propose recommendations to improve the existing EIA re-consultation process. We expect this study helps understand operation status and problems of EIA re-consultation, and provides meaningful implications to improve the existing institutional systems and practice of re-consultation.

• Journal of Chest Surgery
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• v.33 no.1
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• pp.68-72
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• 2000

Background: The resection of recurrent non-small cell lung cancer can be performed very rarely. There has been many arguments for longterm result and therapeutic role in surgical management of recurrent non-small cell lung cancer(NSCLC). We analyze our result of surgical re-resection of recurrent NSCLC for 10 years retrospectively. Material and Method: In the period from 1987 to 1997, 702 patients who had been confirmed for NSCLC had undergone complete resection in Seoul National University Hospital. As December 1997, 22 of these patients have been operated on the diagnosis of recurrent lung cancer. In these patients one has revealed for benign nodule at postoperative pathologic pathologic was unresectable. and two had revealed other cell type on postoperative pathologic examination. Analysis about postoperative survival rate and the factors that influence postoperative survival rate - sex, age, pathologic stage, cell type, operation adjuvant therapy after first and second operation location of recurrence disease free survival-was 59.1$\pm$10.9 year. There were 14 men and 3 women. Four patients was received radiation therpy after first opration and two patients was received postoperative chemotherapy. At first operation 2 patients was stage Ia, 8 was stage Ib, 1 was stage IIa 6 was stage IIb. Eleven patients had squamous. cell carcinoma at postoperatrive pathologic examination five had adenocarcinoma and one had bronchioalveolar carcinoma. In second operation 8 patients were received limited resection. 9 were received lobectomy or pneumonectomy. One-year survival rate was 82.4% and five-year survival rate was 58.2% Non-adjuvant therapy group after initial operation was more survived than adjuvant therapy group statistically. Conclusion: operation was more survived than adjuvant therapy group statistically. Conclusion : Operation was feasible treatment modality for re-resectable non-small cell lung cancer. But we cannot rule out possibility of double primary lung cancer for them. Postoperative prognostic factor was adjuvant therapy or nor after first oepration but further study of large scale is needed for stastically more valuable result.

• Advances in pediatric surgery
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• v.13 no.2
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• pp.105-111
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• 2007

We reviewed the records of 25 patients who were re-operated upon after primary repair of esophageal atresia with or without fistula at the Department of Pediatric Surgery, Seoul National University Children's Hospital, from January 1997 to March 2007. Types of the esophageal atresia anomalies were Gross type A in 5 patients, C in 18, and E in 2. The indications for re-operation were anastomosis stricture (n = 14), tracheo-bronchial remnant (n = 4), persistent anastomosis leakage (n = 3), recurrent tracheo-esophageal fistula (n = 2) and esophageal web (n = 2). The interval between primary and secondary surgery was from 48 days to 26 years 5 months (mean: 2 years and 4 months). Four patients required a third operation. The interval between the second and third operation was between 1 year 1 month and 3 year 10 month (mean: 2 years 5 months). Mean follow up period after last operation was 35 months (1 years-8 years 6 months). The secondary surgery was end-to-end esophageal anastomosis in 15, esophagoplasty in 5, gastric tube replacement in 5. After secondary operation, 6 patients had anastomosis stricture (4 patients were relieved of the symptoms by balloon dilatation, 2 patients underwent tertiary operation). Five patients had leakage (sealed on conservative management in all). Two patients had recurrent tracheo-esophagel fistula (1 patient received chemical cauterization and 1 patient underwent tertiary operation). Currently, only one patient has feeding problems. There were no mortalities. Secondary esophageal surgery after primary surgery for esophageal atresia was effective and safe, should be positively considered when complications do not respond to nonoperative therapy.

• 제어로봇시스템학회:학술대회논문집
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• 2004.08a
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• pp.1221-1224
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• 2004

This paper presents the programmable logic controller (PLC) networking development for communication with the mobile phone. The proposed technique is suitable for remote sensing control systems, which can display the operation status and monitoring fault diagnosis of a system. The system operation is based on the use of personal computer (PC) to logically analyze data from PLC, and existing internet protocol for sending information messages to mobile phones.

• Journal of Chest Surgery
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• v.22 no.6
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• pp.951-959
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• 1989

Between September, 1972 and September, 1989, total 359 patients were operated for acquired heart disease at Department of Thoracic and Cardiovascular Surgery, Hanyang University Hospital. A consecutive series of 293 prosthetic valve replacement was also performed during this period. The results were summarized as follows; 1. There were 141 men and 218 women, whose ages ranged from 6 to 64 years, [mean 35.5 years] 2. Out of 293 cases, mitral valve replacement was 182 cases, aortic valve replacement was 39 cases and double valve replacement was70 cases. 3. Early post-operative death was 30 cases [Mortality; 8.4 %] and late death was 9 cases in the survivors. 4. Re-operation was 30 cases and operative mortality was 10%. 5. Mean post-operative interval was 76 months. [Ranged from 216 months to 2 months] 6. Among re-operation cases, primary prosthetic valve failure was 16 cases and paravalvular leakage was 2 cases. 7. Since January 1988, 79 cases of prosthetic valve replacement were performed and then 1 case was expired. [Mortality; 1.2 %]

• Proceedings of the KIEE Conference
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• summer
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• pp.905-907
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• 2004

This paper deals with the PM performance evaluations in a variable flux memory motor (VFMM) using a coupled finite element method (FEM) and Preisach modeling, which is presented to analyze the magnetic characteristics of permanent magnets. The focus of this paper is the operation characteristics evaluation relative to magnetizing direction and quantity of permanent magnets on re-, demagnetization condition in a variable flux memory motor(VFMM)

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2022.11a
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• pp.383-384
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• 2022

Gas Combustion Unit (GCU) onboard liquefied natural gas carriers handles boil-off to stabilize tank pressure. There are many factors for LNG cargo operators to take into consideration to determine whether to use GCU or not. Gas consumption of main engine and re-liquefied gas through the Partial Re-Liquefaction System (PRS) are good examples of these factors. Human gas operators have decided the operation so far. In this paper, some deep learning neural network models were developed to provide human gas operators with a decision support system. The models consider various factors specially into GCU operation. A deep learning model with Sigmoid activation functions in input layer and hidden layers made the best performance among eight different deep learning models.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.10 no.3
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• pp.684-694
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• 2009

This study is aimed at looking into the PR method of cadastral re-survey, and at looking for the reason of the delay of cadastral re-survey project. We thought that the reason why the cadastral re-survey project was delayed was a lack of a national agreement on it owing to an insufficient PR. So, to solve this question, we proposed an alternative plan for the PR method of cadastral re-survey, using Hutton's PR model. As a result of a study, a total of 31 PR methods was made which were apt for every practical PR on the basis of 6 three-dimensional models of PR practice. But, some of Hutton's PR models proved to be unfit for the cadastral re-survey project. Therefore, we formed and proposed a new model to apt for the cadastral re-survey project. The result of this study is expected to be of help in getting a foundation to form a national agreement on the quick operation of a upcoming cadastral re-survey project.