• 조명전기설비학회논문지
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• 제26권1호
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• pp.38-43
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• 2012

For safe and stable operations of power plants, it is essential to monitor closely crucial measurement values related to power plant trips. In this paper, an intelligent power plant operating state monitoring technique enabling the operating crew member to monitor conveniently the status of the important measurement values and to perceive almost instantly the significance of the implications of those measurement values is developed. The proposed technique is called a "POST(Plant Operating State Tracking) Chart" technique and provides the foundations in developing an intelligent and integrated power plant operating state monitoring support system called the "P-OASIS"(Plant Operation Assessment and Support Intelligent System). The P-OASIS is applied to a thermal power plant of 500[MW] capacity and exhibited impressive performances.

• Journal of Chest Surgery
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• 제22권6호
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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 %]

• 대한의용생체공학회:학술대회논문집
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• 대한의용생체공학회 1997년도 춘계학술대회
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• pp.366-369
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• 1997

In this study, we measured upper right, lower right, upper left region to find the optimal region which represent liver function. We found that the upper right region is optimal because of high accuracy and low standard deviation. For normal subjects all the calculated HEFs were greater than 100% and all those of abnormal ones were less than 80%. Thus HEF can be assumed to discriminate abnormal livers from normal ones. It was found that the patients with surgical operation would survive if both the pre-and the post-operative HEFs are greater than 50%. Therefore HEF method can be a good estimator for surgeon to determine the surgical operation and to evaluate remaining hepatic function after surgery as well as it is reliable and simple.

• 대한치과기공학회지
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• 제44권2호
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• pp.38-46
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• 2022

Purpose: This study aims to confirm the effect of clinical practice on dental technology students by comparing preclinical expectations and post-training satisfaction of dental technology students in Suwon-si, Gyeonggi-do during the coronavirus disease pandemic. Methods: This study included students enrolled in the Department of Dental Technology of D University in Suwon-si, Gyeonggi-do. The purpose of the study was explained in advance and 70 students agreed to participate in the survey. IBM SPSS Statistics version 18.0 was used for data analysis and the significance level was tested at p=0.05. Results: There were significant differences in clinical practice content, operation, institutional expectations, and satisfaction. Conclusion: Based on the differences in expectations and satisfaction in this study, schools, industries, and associations can study ways to increase satisfaction in terms of clinical practice content, operation, and institution to present directions for dental technology and clinical practice.

• 방송과미디어
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• 제4권4호
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• pp.46-51
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• 1999

The introduction of broadcast digital television (DTV) was, at one time, seen as an opportunity to rationalise video formats. The reality is quite different with a rapid divergence as the united States' ATSC offers 18 formats to cover both standard definition (SD) and high definition (HD), and yet more are supported by Europe's DVB. At the same time multi-media is expanding both as an area for source material and for finished work. Post production needs to move away from single-format facilities as requirements for multi-format operation is already increasing. A 'format-independent' solution is described which allows efficient operation with any mix of input formats and able to output any format with high quality. Attention is given to retaining the speed, accuracy and immediacy which is a feature of today's professional facilities -even while handling the greater demands of HD. Another route, using 24 frames-per-second is also examined.

• 한국항해항만학회지
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• 제30권4호
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• pp.277-283
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• 2006

It is a world trend to construct large terminal and develop automated container terminal to attract Super Post-Panamax and provide service which is based on differentiation. In fact, there is insufficient research for automatization of terminal gate since the automatization of current constructed container terminal is only focused on increasing productivity and unmanned system through the automatization of quay, yard, etc. In this paper, we have investigated advantage/disadvantage of existing gate operation systems and compared each gate operation system in the aspect of raising terminal image and the productivity. For the specific study, we have used data from actual terminal gate operation and RFID model business sponsored by MOMAF (Ministry of Maritime Affairs and Fisheries). As a result, this paper carried out an efficient gate operation system and it has been expected that it will be performed as groundwork of automated gate operation system which is for design of container terminal and improvement of gate operation system.

• 대한한의학회지
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• 제30권3호
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• pp.111-118
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• 2009

Hysterectomy can lead to various symptoms threatening decent quality of life. As the frequency of hysterectomy increases, there are many patients who want to take oriental medicine treatments for complications. Several clinical studies have reported the effectiveness of oriental medicine treatment for post-hysterectomy complications. Out of these symptoms, postoperative nausea and vomiting (PONV, hereafter) are indicated at about 20-40% of frequency within patients with general anesthesia, and they may occur not only during recovery from operation, but also after discharge. Although the incidence of PONV has decreased now thanks to the usage of antiemetics, PONV still causes some difficulties for patients returning to daily life. This study reports two cases of post-hysterectomy complications such as nausea, dizziness, vomiting, general weakness, and coldness of the limbs, which had good responses to herbal medication and acupuncture.

• 조명전기설비학회논문지
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• 제22권5호
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• pp.103-107
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• 2008

전국에 분포되어 있는 중 대형규모의 우체국수는 160국으로 우체국 건물의 에너지 절약 차원에서 건물 설비를 효율적으로 관리하는 것이 매우 중요하다. 본 연구에서는 우체국 건물의 에너지 소비현황과 운용실태를 조사 분석하였으며, 보다 효율적인 건물관리를 위해서는 시스템, 조직, 인력, 운영 등을 유기적으로 통합 관리 할 수 있는 방안이 필요하다. 본 논문에서는 우체국건물의 자원을 통합, 그룹 관리하는 방안으로 인터넷을 이용한 군관리시스템 구축방안을 제시하였으며, 군관리시스템 적용 시 기대되는 경제적 효과를 분석하였다.

• 전력전자학회논문지
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• 제14권1호
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• pp.46-53
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• 2009

본 논문은 다중출력 전원 시스템을 위한 새로운 구조의 영전류 스위칭(ZCS, Zero Current Switching) LLC 공진형 Post-regulator를 제안한다. 기존의 LLC 공진형 컨버터는 정밀한 다중 출력을 얻기 위해 추가의 비 절연형 DC/DC 컨버터가 요구되었고, 이는 전력 변환 효율 감소 및 제조 원가 상승의 단점을 갖고 있다. 제안된 Post-regulator는 각 정류 다이오드 및 전력 스위치의 내압 및 전류 스트레스가 작고, 부피가 큰 고가의 비 절연형 DC/DC 컨버터의 추가 대신 1 개의 보조 스위치만으로 구현되므로 구조가 간단하고, 저가격화에 유리하다. 또한, 제안된 Post-regulator의 모든 전력 스위치는 영전류 스위칭이 가능하므로 EMI 특성이 우수하며 스위칭 손실을 최소화 할 수 있다. 최종적으로 본 논문에서 제안된 전원 시스템의 동작 원리 및 타당성을 검증하기 위하여, 영전류 스위칭 LLC 공진형 Post-regulator의 실험 결과를 제시한다.

• Journal of Korean Neurosurgical Society
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• 제29권7호
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• pp.968-972
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• 2000

Post-shunting subdural hemorrhages are usually small and self-limited, and they can be recognized on the routine post-operative CT examinations. However, delayed subdural bleeding may occur without any clinical symptoms or signs. Thus the hematoma remains undetected, and it can be increased in size and sometimes become calcified with time. We experienced a case of 15-year-old male with a large calcified subdural hematoma who had undergone shunt operation 10 years previously. With pertinent review of the literatures, we discuss the possible mechanism of calcification and the proper way of treatment in calcified chronic subdural hematoma.