• 인터넷정보학회논문지
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• 제20권6호
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• pp.21-28
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• 2019

Process mining is state-of-the-art technology in the workflow field. Recently, process mining becomes more important because of the fact that it shows the status of the actual behavior of the workflow model. However, as the process mining get focused and developed, the material of the process mining - workflow event log - also grows fast. Thus, the process mining algorithms cannot operate with some data because it is too large. To solve this problem, there should be a lightweight process mining algorithm, or the event log must be divided and processed partly. In this paper, we suggest a set of operations that control and edit XES based event logs for process mining. They are designed based on relational algebra, which is used in database management systems. We designed three operations for tailoring XES event logs. Select operation is an operation that gets specific attributes and excludes others. Thus, the output file has the same structure and contents of the original file, but each element has only the attributes user selected. Union operation makes two input XES files into one XES file. Two input files must be from the same process. As a result, the contents of the two files are integrated into one file. The final operation is a slice. It divides anXES file into several files by the number of traces. We will show the design methods and details below.

• 전기학회논문지
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• 제62권1호
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• pp.8-20
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• 2013

This paper deals with the concept design of HVDC system for controlling AC network reactive power. HVDC system can control active power and reactive power and the control concept of reactive power is similar to SVC(Static Var Compensator). Reactive power is controlled by adjusting firing angle of HVDC system under the condition that AC filters are switched. Reactive power depends on AC voltage condition, considering the steady-state and transient state to maintain the stable operation of AC network in the viewpoint of voltage stability. Therefore, in the design stage of HVDC, the reactive power required in the AC network must be considered. For the calculation of operation angle in HVDC system, the expected reactive power demand and supply status is examined at each AC system bus. The required reactive power affects the determination of the operation angle of HVDC. That is, the range of "control deadband" of operation angle should have the capability supplying the required reactive power. Finally, the reactive power control concepts is applied to 1GW BTB Pyeongtaek-Dangjin HVDC system.

• 한국IT서비스학회지
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• 제18권2호
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• pp.37-54
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• 2019

The purpose of this study is to present an evaluation model to measure the clarification level of stakeholder requirements of public sector software projects in the Republic of Korea. We tried to grasp the quality of proposal request through evaluation model. It also examines the impact of the level of stakeholder requirements on the level of system requirements. To do this, we analyzed existing research models and related standards related to business requirements and stakeholder requirements, and constructed evaluation models for the system operation concept documents in the ISO/IEC/IEEE 29148. The system operation concept document is a document prepared by organizing the requirements of stakeholders in the organization and sharing the intention of the organization. The evaluation model proposed in this study focuses on evaluating whether the contents related to the system operation concept are faithfully written in the request for proposal. The evaluation items consisted of three items: 'organization status', 'desired changes', and 'operational constraints'. The sample extracted 217 RFPs in the national procurement system. As a result of the analysis, the evaluation model proved to be valid and the internal consistency was maintained. The level of system operation concept was very low, and it was also found to affect the quality of system requirements. It is more important to clearly write stakeholders' requirements than the functional requirements. we propose a news classification methods for sentiment analysis that is effective for bankruptcy prediction model.

• 대한영양사협회학술지
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• 제7권1호
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• pp.72-79
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• 2001

The purpose of this study is to investigate the dietary intakes and nutritional status in total gastrectomized patients. We assessed the nutritional status by dietary intake, anthropometric data and biochemical data. And we also checked the subjective postprandial symptoms and gastrofiberscopy to detect the reflux esophagitis in 22 patients who were free of tumors for more than 1 year after total gastrectomy by the three different reconstruction methods(Loop esophagojejunostomy with A-loop tie/ Roux-en-Y esophagojejunostomy/Roux-en-Y esophagojejunostomy with Paulino pouch). Any patients were not in malnutrition status in respect to biochemical data. By assessing the dietary intake, the average daily calorie intake was 1848.2$\pm$440.2kcal, it was 105.9$\pm$23.8% of energy requirement. But there was weight loss in 21 patients of 22 patients after operation and the weight loss was 12.8% of preoperative weight(61.0$\pm$7.9 vs. 53.5$\pm$6.7kg, preoperatively vs. at the time of study). This may suggest that continuous nutritional care is necessary after total gastrectomy to promote sufficient calorie intake, keeping good nutritional state. There were no significant differences between the methods of reconstruction and dietary intakes or nutritional status. Endoscopic esophagitis was more frequently found in patients of loop esophagojejunostomy than any other reconstruction methods(p<0.001), but it didn't show any effect on the dietary intakes.

• 보건교육건강증진학회지
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• 제24권1호
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• pp.29-43
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• 2007

Objectives: The purpose of this study was to investigate the obesity prevalence and to test the obesity prevalence and health status, socio-demographic factors and lifestyle such as smoking and drinking habits, diet habit and physical activity of rural residents in Korea. Methods: The interview survey was performed in November 2005 with structured questionnaires to 518 respondents of the residents who lived in Jindo-Gun of Jeonnam province. The questionnaire was the abridged Scale of the Health and Nutrition Survey and health status as the morbidity, subjective health status and health examination. The covariate, F-test or t-test, and Chi-squire method were used for some of the cross-sectional data. Results: The 518adults respondents were composed of 49.8% male and 50.2% female. Average weight of male was $67.4{\pm}8.36kg$, and average weight of female was $56.5{\pm}6.92kg$. The obesity rate was 20.7%, and the lower weight rate was 2.9%. About the subjective health status that 43.2% of the respondents have been answered not good health status, 70.8% of the respondents have been health examination. 56.0% of the respondents had disease, while 49.0% of the respondents had chronic disease, and 11.1% of the respondents had acute disease. The obesity rate and general characteristics(age, education level) was positively correlated. And while the relationships were positive between obesity rate and between lifestyle(overeating, drinking, dining-out). Conclusion: These results suggested that education programs of the health habits such as drinking, physical exercise and eating habits were necessities for the residents of rural area. Further research would be required to specify the necessities and operation researches.

• Journal of Radiation Protection and Research
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• 제42권1호
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• pp.1-8
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• 2017

Background: The use of radiation and radioisotopes in Korea has been increasing each year, and its impact on economy and industry is expected to be increasing progressively following the development of industrial technology and the expansion of their usage. To establish and supporting policies for industries using radiation and radioisotopes, it is necessary to check the status of related industries accurately, as well as to gather data required to establish plans for industrial development by studying both revenues and economic scale (contributing to revenue). Materials and Methods: To analyze the status of utilization, surveys were carried out on 6,621 organizations engaged in nuclear operations handling radiation and radioisotopes pursuant to the Nuclear Safety Act as of end 2014, on 33,471 medical institutions using radiation generators for medical and diagnostic purposes pursuant to the Medical Service Act, and on 2,218 organizations using radiation generators for animal diagnostics pursuant to the Veterinary License Act. Results and discussion: The overall status of the domestic radiation market including the number of user organizations, that of employees, and the size of distributions (imports, productions, and exports) with which the scale of domestic radiation market can be judged showed a growth trend compared to the previous year, though the number of employees for radiation operation in industrial sector, research sector, education sector, military sector, and power plants (nuclear power plants) and the size of imports was reduced somewhat. Conclusion: It is expected that data acquired through periodic surveys on the status of utilization would be utilized practically in establishing governmental policies related to the promotion of usage of radiation and radioisotopes, and also be utilized widely in cultivating and developing the industry efficiently to invigorate the related industries.

• 한국항행학회논문지
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• 제27권5호
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• pp.643-648
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• 2023

한국형 위성항법보정시스템 KASS(Korea Augmentation Satellite System)은 2023년 12월 국제민간항공기구 표준의 항공용 서비스 제공을 목표로 개발 중인 SBAS 시스템이다. KASS 서비스의 지속적인 제공을 위해서는 시스템의 상태감시가 필수적이며 이를 위해 상태감시 도구가 개발되어야 한다. 상태감시 도구 개발은 목적에 따라 실시간 상태감시, 장기간 상태감시로 구분되어 개발되었다. 도구 개발은 요구사항 정의, 설계, 개발, 검증의 일련의 절차를 통해 완료하였다. 상태감시 도구 검증을 위해 실제 KASS 시스템의 2023년 8월 데이터를 활용하여 검증하였고 그 결과를 통계적으로 분석하여 운영시간, 운영률을 도출하였다. 2023년 이후부터 시작되는 항공용 서비스에 이 도구들을 활용하여 지속적 서비스 제공을 지원할 계획이다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2004년도 Proceedings of ISRS 2004
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• pp.512-514
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• 2004

The Electro-Optical Camera (EOC) is a high spatial resolution, visible imaging sensor which collects visible image data of the earth's sunlit surface and is the primary payload on KOMPSAT-l. The purpose of the EOC payload is to provide high resolution visible imagery data to support cartography of the Korean Peninsula. The EOC is a push broom-scanned sensor which incorporates a single nadir looking telescope. At the nominal altitude of 685Km with the spacecraft in a nadir pointing attitude, the EOC collects data with a ground sample distance of approximately 6.6 meters and a swath width of around 17Km. The EOC is designed to operate with a duty cycle of up to 2 minutes (contiguous) per orbit over the mission lifetime of 3 years with the functions of programmable gain/offset. The EOC has no pointing mechanism of its own. EOC pointing is accomplished by right and left rolling of the spacecraft, as needed. Under nominal operating conditions, the spacecraft can be rolled to an angle in the range from +/- 15 to 30 degrees to support the collection of stereo data. In this paper, the status of EOC such as temperature, dark calibration, cover operation and thermal control is checked and analyzed by continuously monitored state of health (SOH) data and image data during the mission life of 3 years. The aliveness of EOC and operation continuation beyond mission life is confirmed by the results of the analysis.

• 한국주거학회논문집
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• 제25권2호
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• pp.109-120
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• 2014

This study is focused first on considering the factors which invigorate the community in an apartment complexes from the precedent study and on identifying the specific factors, necessary to run vigorously the community in an apartment complexes. After that, the study is devoted to develop the management scenarios suitable for each type, through identifying, on the basis of the factors, the operation type of the 15 apartment complexes, in which the Seoul city community experts exist. The study result could be the basis to find out an effective method to run and manage community facilities and programs according to the features of an apartment. On the study, the 1:1 in-depth interviews were conducted on the community experts, who supported the community management in the five autonomous districts in Seoul. The study found followings. 1) The community factors needed to be readjusted in respect of operation and management. to estimate how active the community in an apartment complexes was. After identifying the community operation factors, the factors in human resources, material resources, and financial resources, were figured out. 2) The five groups were drawn from the 15 apartment complexes. The grouping was based on the relation between the main operators in each factor which invigorates the community operation. As the result, the relationship between the main operators was vertical. In addition, the more operators. 3) Six types were drawn after grouping the operation status of the 15 apartment complexes on the factors which affected to the community invigoration: human resources, material resources, and financial resources. Consequently, the managing scenarios to invigorate the community in each type were suggested.

• 항공우주산업기술동향
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• 제6권1호
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• pp.105-115
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• 2008

위성의 임무운영팀 조직은 운영되는 위성의 개수,탑재체 운영지원의 여부,임무운영센터 내에서의 안테나 운영 여부, 지상시스템 자동화 정도 및 임무운영에 대한 기술지원 기능 여부에 따라서 다양한 구성이 존재할 수 있다. 위성운영 업무를 담당하는 운영조직의 구성이나 기능은 임무운영의 복잡도에 따라 약간씩 차이가 있으나 대부분의 위성운영센터는 단일 또는 복합 임무운영 지원을 위해 유사한 조직 구성을 갖는다. 항우연 임무운영센터는 아리랑위성1호 발사(1999년 12월 21일)이후 임무운영팀의 업무를 시작한 이래, 아리랑 위성 2호, 아리랑위성 3호와 5호 및 통신해양기상위성에 대한 다중임무운영의 개념으로 진화하고 있다. 본 동향에서는 본격적인 다중임무운영에 앞서 체계적인 임무운영센터의 조직을 구성하고자 해외 선진 임무운영 개념에 대한 권고사항과 실제 적용되고 있는 사례를 살펴본 후, 항우연 임무운영센터의 현재 현황과 비교분석함으로써 조직 운영의 적합성과 향후 발전방향에 대해서 살펴보고자 한다.