• 대한전기학회:학술대회논문집
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• 대한전기학회 1997년도 하계학술대회 논문집 D
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• pp.778-780
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• 1997

This study considers a hydro power energy operation management and planning problem in KEPCO power systems for efficient use of hydro resources. A database is developed to provide with a convenience to hydro Power operation management and Planning by studying of the hydro resourse characteristics of Korea. The data is obtained in the operation history from 7 years ago and by considering the hydro facility planning to 2010 year. Also a computer program is developed to decide the monthly required volume of water and the water level of a dam in the Han river using the database.

• Journal of Chest Surgery
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• 제23권5호
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• pp.1027-1034
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• 1990

Pectus excavatum, commonest developmental anomaly of chest wall, is manifested by depression of the sternum and lower costal cartilages that is of surgical interest. From 1982 through 1990, fifteen patients have undergone surgery for treatment of pectus excavatum and treated by Ravitch operation: 5, Modified Ravitch operation; 4, Wada operation, 1 and Modified Wada operation, 5. There was familial history of pectus excavatum in 3 patients. Associated congenital anomaly were seen in 6 patients; scoliosis in 3 patients, right inguinal hernia in 1, polydactyly in 1 and patent ductus arteriosus in 1 patent. Postoperative minor complications were developed in 3 cases; pneumothorax, 2 cases; pleural effusion, 2 cases; wound infection and dehiscence, 1 cases; pressure sore due to strut malposition, 2 cases; flail chest and 2 cases; seroma. The incidence of the postoperative complications were more common in cases who were treated by metal strut, pin or other prosthetic materials for supporting the chest wall integrity than the standard corrective procedure. All cases have no recurrence of chest wall depression and operative death.

• Journal of Mechanical Science and Technology
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• 제19권2호
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• pp.549-557
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• 2005

The requirements of multi-resolution models of feature-based solids, which represent an object at many levels of feature detail, are increasing for engineering purposes, such as analysis, network-based collaborative design, virtual prototyping and manufacturing. To provide multi-resolution models for various applications, it is essential to generate adequate solid models at varying levels of detail (LOD) after feature rearrangement, based on the LOD criteria. However, the non-commutative property of the union and subtraction Boolean operations is a severe obstacle to arbitrary feature rearrangement. To solve this problem we propose history-based Boolean operations that satisfy the commutative law between union and subtraction operations by considering the history of the Boolean operations. Because these operations guarantee the same resulting shape as the original and reasonable shapes at the intermediate LODs for an arbitrary rearrangement of its features, various LOD criteria can be applied for multi-resolution modeling in different applications.

• 대한족부족관절학회지
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• 제7권2호
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• pp.187-193
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• 2003

Purpose: To provide baseline data for prevention and education of diabetic foot in Korea. Materials and Methods: 216 diabetic patients are included in this survey. The average age is 58.64 year old with average 9.92 years of diabetes mellitus periods. Among them, 41% used insulin injection, 42% oral medication, 14% both and 3% diet were used for their blood sugar control. The diabetic foot survey was done. Results: The survey of patients symptom and disease of their feet results: 49% had sensory decrease in their feet. Associated disease in foot were callus(15%), heel pain(10%), bunion(4%), toe deformity(2%), Tinea pedis were 9%, tingle sensation were 17%, and swelling on feet were 2%, The survey of patients privious history of foot problems are: 8% had previous operation history on their feet and 17% had history of infection on their feet, 23% had bullae history, The survey of patients prevention and education are: Those who have had more than one diabetic foot education were 45.7%, and among them 24% had routine regular foot check up. Only 5% wear special diabetic shoe and 3% had custom orthotics. Conclusion: Interests to diabetic foot care is increasing in diabetic patients in Korea. However still we need more education, and efforts for prevention. Special education and diabetic shoe is still low, The survey data could be good baseline for diabetic prevention and education.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2003년도 추계학술대회 논문집(I)
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• pp.3-16
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• 2003

'High speed' in today's railway is generally understood to mean 'regular revenue-earning operation of passenger trains at more than 200 km/h', and true high-speed services in this sense began in Japan in 1964. Today, Japan's high-speed rail network slightly exceeds 2, 000 km, carrying around 750, 000 passengers every day without any fatal accident for nearly 40 years.(omitted)

• Nuclear Engineering and Technology
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• 제30권6호
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• pp.531-540
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• 1998

The DYLAM-3 code which overcomes the limitation of event tree/fault tree was applied to LOOP (Loss of Off-site Power) in the mid-loop operation employing HEPs (Human Error Probabilities) supplied by the ASEP (Accident Sequence Evaluation Program) and the SEPLOT (Systematic Evaluation Procedure for Low power/shutdown Operation Task) procedure in this study. Thus the time history of core uncovery frequency during the mid-loop operation was obtained. The sensitivity calculations in the operator's actions to prevent core uncovery under LOOP in the mid-loop operation were carried out. The analysis using the time dependent HEP was performed on the primary feed & bleed which has the most significant effect on core uncovery frequency. As the result, the increment of frequency is shown after 200 minutes duration of simulation conditions. This signifies the possibility of increment in risk after 200 minutes. The primary feed & bleed showed the greatest impact on core uncovery frequency and the recovery of the SCS (Shutdown Cooling System) showed the least impact. Therefore the efforts should be taken on the primary feed & bleed to reduce the core uncovery frequency in the mid-loop operation. And the capability of DYLAM-3 in applying to the time dependent concerns could be demonstrated.

• Nuclear Engineering and Technology
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• 제28권3호
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• pp.257-264
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• 1996

The conventional Equipment Environment Qualification (EEQ) envelope is developed based on the containment responses during the design basis events. The Safety Depressurization System (SDS) design without In-containment Refueling Water Storage Tank (IRWST) adopted in the Ulchin 3&4 challenges the conventional EEQ envelope during long term Feed and Bleed (F&B) operation due to the direct discharge of high mass and energy into the containment. Therefore, it is necessary to confirm that the containment pressure and temperature history during the long term F&B operation does not violate the conventional EEQ envelope. However, this subject has never been quantitatively assessed before. To investigate the success path of long term F&B operation this paper analyzes the thermal hydraulic response of the containment and Reactor Coolant System (RCS) until the completion of depressurization and cooldown of RCS into Shutdown Cooling System (SCS) entry condition. It is found that the SCS entry condition can be reached within 6 hours without violating the EEQ curve by proper operation of SDS valves, High Pressure Safety Injection (HPSI) pumps and active Containment Heat Removal System (CHRS). The suggested strategy not only demonstrates the feasibility of long term F&B operation but also can be utilized in the preparation of Emergency Procedure Guidelines (EPGs)

• Journal of Contemporary Eastern Asia
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• 제12권2호
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• pp.35-47
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• 2013

This study aims to understand haiku phenomena from the viewpoint of communication, which emerges from reciprocal relationships among haiku poets, haiku societies, media on haiku, and other establishments relating to haiku. Such an analytic point of view, which tries to consider both the operation of each autonomous agent and that of the whole system consisted by the agents, is included in the realm of second-order cybernetics. The operation of a system cannot be reduced completely to a system's individual components, which is why such a viewpoint is required. Fundamental informatics, which is employed as a theoretical framework, and two haiku movements, which include shin keiko haiku ("new-trend" haiku) and dento ha haiku (Hototogisu-school haiku), forming an important part of modern haiku history, are the focus of this study. As a result, modern haiku history is considered to be an evolution of a haiku system, whose main incentive is an awareness of the production mechanism of haiku communication occurring through second-order observations in the system. This study also illuminates how haiku poets, haiku societies, and media covereage of haiku play roles in the evolution of the haiku system.

• 컴퓨터교육학회논문지
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• 제5권4호
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• pp.61-69
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• 2002

소프트웨어 문서는 논리적인 객체와 객체간의 관계로 이루어지며 개발 과정에서 여러 버전이 생성된다. 효율적인 소프트웨어 개발을 위해서는 소프트웨어 구성 요소에 변경이 일어났을 경우 변경의 내용과 변경이 전파되어야 할 범위를 쉽게 알 수 있어야 한다. 그러나 큰 단위 소프트웨어 객체 관리에서는 변경의 내용과 전파 범위를 알기 힘들다. 따라서 논리적인 객체와 객체간의 종속성을 관리하는 미세 단위 객체 관리가 필요하다. 본 논문에서는 소프트웨어 편집 과정에서 적용되는 연산 히스토리를 이용한 미세단위 소프트웨어 일관성 관리 모델을 제안하였다. 본 논문에서는 미세 단위 일관성 관리에 대한 정형적인 모델을 제시하였으며, 관성은 객체간의 종속성과 객체에 적용된 연산의 종류에 의해 관리되므로 불필요한 변경 전파를 피할 수 있다.

• Child Health Nursing Research
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• 제23권4호
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• pp.407-415
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• 2017

Purpose: The purpose of this study was to examine how child development knowledge, child rearing knowledge, and use of healthcare services after discharge affect maternal confidence among mothers of premature infants. Methods: Participants in this study were 55 mothers who were involved in internet communities for mothers with premature infants and 30 mothers who visited hospitals for follow up care after having their babies discharged from Neonatal Intensive Care Units (NICU) in South Korea. Results: Presence of operation history, child development and rearing knowledge, and use of healthcare service explained 12.2% of maternal confidence. Presence of operation history (${\beta}=.32$, p<.05) and child development knowledge (${\beta}=.52$, p<.05) were significant predictors for maternal confidence. Conclusion: The results of this study suggest that mothers with premature infants need further education especially on motor development, developmental knowledge, and knowledge related to operations for mothers whose child had surgery in the NICU. Also information about services provided from community health services for premature infants need to be advertised and distributed.