• 대한조선학회논문집
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• 제46권4호
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• pp.391-397
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• 2009

In this paper, longitudinal static stability is investigated, which is an essential requirement for the safety and the performance of the human powered hydrofoil boat (HPHB). In case a disturbance changes the trim angle of the boat, the derivative of the moment about the center of gravity must be negative in order to make the boat to be stable. The equation to evaluate the longitudinal static stability of the EPISODE, a HPHB of Chungnam National University with a height controlling system(HCS) is derived. From the derivative it is confirmed that a longitudinal and vertical position of the center of gravity is important for a HPHB. The range of a trim angle while the boat is foil-born was found with a HCS under the condition of mechanical restraint. And it is confirmed that the longitudinal static stability is satisfied for EPISODE in certain range of a trim angle. It is also shown that the longitudinal static stability and a range of the trim angle can be determined from the principal dimensions of a HPHB, therefore, it can be applied from the stage of the conceptual design of HPHB.

• 한국자동차공학회논문집
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• 제11권2호
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• pp.148-156
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• 2003

Many car manufacturers have frequently adopted an aggressive inflator and a lower threshold speed for airbag deployment in order to meet an injury requirement for unbolted occupant at high speed crash test. Consequently, today's occupant safety restraint system has a weakness due to an airbag induced injury at low speed crash event. This paper proposes a new crash algorithm to improve the weakness by suppressing airbag deployment at low speed crash event in case of belted condition. The proposed algorithm consists of two major blocks-crash severity algorithm and deployment logic block. The first block decides crash severity with two levels by means of velocity and crash energy calculation from acceleration signal. The second block implemented by simple AND/OR logic combines the crash severity level and seat belt status information to generate firing commands for airbag and belt pretensioner. Furthermore, it can be extended to adopt additional sensor information from passenger presence detection sensor and safing sensor. A simulation using real crash data for a 1,800cc passenger vehicle has been conducted to verify the performance of proposed algorithm.

• 자동차안전학회지
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• 제15권2호
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• pp.35-41
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• 2023

On December 19, 2015, as Article 29-3 (Installation of Accident Recording Devices and Provision of Information) of Motor Vehicle Management Act came into force, In Korea, the EDR (Event Data Recorder) reports are often used for the analysis of various traffic accident cases such as multiple collisions, traffic insurance crimes, and sudden unintended acceleration (SUA), and the others. So many investigators have analyzed the driver's behavior and vehicle situation by comparing the time zero in the EDR report to the actual crash time in dash-cam (or CCTV). Time zero (T0) is defined as the reference time for the record interval or time interval when recording an accident in Article 56-2, Enforcement rule of Performance and Standard for Automobile and Automotive parts. Also in the EDR report, time zero (T0) is defined as whichever of the following occurs first; 1. "wake-up" by an air-bag control system, 2. Continuously running algorithms (by monitoring of longitudinal or lateral delta-V), 3. Deployment of a non-reversible deployment restraint. We have already proposed the "Flowchart & Checklist" to adopt the EDR report for traffic accident investigation and the necessity of specialized institutions or courses to systematically educate or analyze the EDR data. Therefore, in this paper, we report to traffic accident investigators notable points and analysis methods based on some real-world traffic accidents that can be misjudged in specifying time zero (T0).

• 조명전기설비학회논문지
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• 제14권4호
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• pp.23-30
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• 2000

열병합발전 시스템은 환경 친화적인 동시에 상대적으로 고 효율의 에너지 시스템으로서 분산 방전설비의 혁신 기술중 하나이다, 아울러 열병합발전 시스템운 열과 전기의 분산공급에 적절한 발전 시스템이다. 그러나, 열병합발전 시스템의 계통 연계는 전압 소정, 전압변동, 보호협조, 안전등의 제반 연제문제를 수반한다. 특히, 이러한 연계문제 중 열병합발전 시스템의 배전계통 연계.분리 운전은 배전계통의 전압조정 및 변동에 영향을 미칠 것이 예상된다. 최근 수용가 소유의 컴퓨터 및 민감한 전자소자의 사용 증가로 인하여 전력품질온 중요한 고려사항이 되고 있다. 따라서 열병합발전 시스템과 관련한 전압품질은 반드시 분석되어야만 한다. 왜냐하면 전압품질은 전력 품질의 중요한 요소이기 때문이다. 본 논문에서는 열병합발전 시스템의 배전계통 연계 운전에 따른 순서전압변통 에 대하여 컴퓨터 시물레이션을 롱하여 분석하였고、 또한 이의 억제 대책을 제시하였다. 아울러 순시전압변동 측면에서 본 피더 당 열병합발전시스템의 단위 도입 용량을 평가하였다. 본 논문의 결과는 열병합발전 시스템 또는 분산형 전원의 계통 연계 표준. 가이드라인에 유용한 자료가 되리라 믿는다.

• 간호행정학회지
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• 제8권3호
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• pp.361-372
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• 2002

Purpose : The purpose of study was to identify to analysis of core nursing interventions performed by Operating Room nurses. Method : The subjects of the study were arbitrarily selected nurses(n=104) working in Operating Room. The period for data collection was 15 days from July, 15, 2002 to July, 30. 2002. The instrument for study was 486 Nursing Interventions Classification developed by McClosky & Bulechek(2000) and was translated into Korean. In 486 nursing interventions, 57 nursing interventions were selected by more than half of 47 professional nurses group of Operating Room. 57 nursing interventions were used as a secondary questionnaire. In the secondary questionnaire, labels and definitions of all 57 interventions were listed. The collected data were self reported by Operating Room nurses. The data were analysed with SPSS program. Result : In 57 nursing interventions, the 'Behavior' domain was the most frequently used. Core interventions of Operating Room were performed several times a day by more than 50% of Operating Room nurses. Core interventions of Operating Room were 16 Core interventions, 7 classes, 5 domains. In the core interventions, the 'Physiological:Complex' domain was the most frequently used. Core interventions of Operating Room were Surgical Preperation, Infection Control:Intraoperative, Surgical Precautions, Fall Prevention, Documentation, Surgical Assistance, Environmental Management:Safety, Skin Surveillance, Physical Restraint, Pressure Ulcer Prevention, Environmental Management:Comfort, Infection Protection, Presence, Emotional Support, Specimen Management, Shift Report. Conclusion : Core interventions of Operating Room have implications for nursing care practice, nursing education, nursing research, and nursing information system in Operating Room.

• 한국지반공학회지:지반
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• 제7권3호
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• pp.21-32
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• 1991

본 연구에서는 복합 zone을 가진 rockfill dam성토 재료의 강도정수들과 core zone에서의 간극 수압의 불확정성을 고려할 수 있도록, 성토 재료의 공간적인 변화의 불확실성, 시료수의 제한에 의 한 불확정성에 실험실 결과와 현장 결과와의 차이에 따른 model 오차의 영향을 고려한 종합적인 설계변수들의 불확정성을 규명하였으며 core zone의 간극수압과 rockfill zone의 내부 마찰각을 bayeg 이론을 이용하여 불확정성을 Updating할 수 있는 방법을 제시하였다. 사면 안정 해석에서 시공직후 상, 하류, 만수위 상, 하류 수위, 급강하 시의 2차원 사면안정해석 과 end effect 영향을 고려한 3차원사면 안정해석을 하였다. 본 목적을 위하여 복합 zone을 가진 rockfill dam의 사면 안정해석에서 end effect의 영향을 고려한 3차원 사면안정해석 Program인 "ESTABL"을 개발하였으며, 파괴 사면의 강도정수와 간극수압의 변동계수를 구하는 프로그램 "COV", 복합 zone사면 안전율의 변동계수를 구하는 프로그램 "PCOV"을 개발하였다. 사면안정해석 결과 3차원안전율이 2차원안전율보다 약 200A정도 크게 나타나므로 end restraint 효과가 상당히 큼을 알 수 있다. 3차원사면안정은 근본적으로 system reliability 문제이 므로 안전율의 평균간보다 그 불확정성이 더 큰 영향을 미침을 보여준다. 또한 기초설계 치로 설계 를 마친후 시공중 혹은 추가로 각종 계측치가 있을 때 updating 이론을 이용하여 신뢰도를 증가시 킬 수 있음을 보여주며 강도계수의 변화에 의한 파괴확률의 변화는 점착력의 불확정성이 내부마찰 각의 불확정성보다 민감하게 영향을 미침을 보여준다.찰 각의 불확정성보다 민감하게 영향을 미침을 보여준다.