• 한국응급구조학회지
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• 제21권3호
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• pp.7-16
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• 2017

Purpose: The purpose of the study was to investigate the effects of laryngeal mask airway (LMA) insertion from different positions, using different methods, on the quality of the insertion, for identifying a more convenient and effective insertion method. Methods: In a model ambulance, 30 paramedic students performed the LMA insertion procedure, in four different settings, combinations of the rescuer's position (at the head end of the patient, at the side of the patient), and insertion technique (index finger insertion, thumb insertion), in a randomized order. Quality of insertion index and convenience of use were measured. Results: The quality of insertion index (tidal volume, gastric insufflation, airway pressure, airway sealing pressure, midline positions, insertion success grade, and insertion time) were not significantly different among four different settings. However LMA insertion from the anterior (head) end, using the index finger method compared to the thumb method was found to be significantly more convenient. Conclusion: We recommend using the more convenient and familiar LMA insertion method, between index finger insertion and thumb insertion, regardless of rescuer's position.

• 한국버섯학회지
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• 제11권1호
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• pp.21-23
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• 2013

잣버섯 생육환경조건 중 생육온도를 설정하기 위하여 실험한 결과 생육온도 $20^{\circ}C$에서 상품수량이 가장 우수한 결과를 나타 내었으며 다음과 같다. 생육온도에 따른 갓의 명도값은 차이가 나지 않았으나 적색도 및 황색도는 온도가 높을수록 높아지는 경향이었고, 대의 경도 및 깨짐성은 17 및 $20^{\circ}C$에서 높았다. 잣버섯의 생육온도에 따른 자실체의 생육특성은 온도가 높을수록 발이유도기 및 자실체의 발생기간이 빨랐으나 수량은 모두 유의성이 나타나지 않았다. 그러나 상품수량의 경우 20에서 가장 높았다. 갓크기는 생육온도 $20{\sim}23^{\circ}C$에서 $17^{\circ}C$ 보다 컸고, 대굵기는 $17^{\circ}C$에서 가장 굵었다.

• 한국산업융합학회 논문집
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• 제20권1호
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• pp.49-55
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• 2017

This study proposes a new approach to Control and trajectory generation of a 8 DOF human robot arm with computational complexity and singularity problem. To deal with such problems, analytical methods for a redundant robot arm have been researched to enhance the performance of research, we propose an analytical kinematics algorithm for a 8 DOF bipped dual robot arm. Using this algorithm, it is possible to generate a trajectory passing through the singular points and intuitively move the elbow without regarding to the end-effector pose. Performance of the proposed algorithm was verified by simulation test with various conditions. It has been verified that the trajectory planning using this algorithm.

• 한국강구조학회 논문집
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• 제26권5호
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• pp.375-383
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• 2014

최근 자전거나 보행자들이 쉽고 편리하게 이동 할 수 있는 보도교와 미관중심의 보도교가 가설되고 있다. 그러나 보행자의 보행이 보도교의 고유진동수와 근접할 경우 공진현상에 의해 큰 진폭이 발생하여 보행자에게 보행시 불안감을 조성시킨다. 그러나 보행시 진동에 따른 연구는 매우 미약하다. 따라서 휴대용 진동계측기를 통하여 서울시에 가설된 65개소의 보도교를 대상으로 공진발생에 따른 고유진동수를 분석하였고 경간별 고유진동수 상관관계와 구조시스템에 따른 경간과 고유진동수의 상관관계를 분석하였다.

• 한국초전도ㆍ저온공학회논문지
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• 제7권1호
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• pp.37-41
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• 2005

This paper describes the construction scheme of new distribution system using HTS(High Temperature Superconducting) power equipments such as cable, transformer and FCL(fault current limiter). At present, one of the most serious problems in distribution power system, especially for metropolitan complex city, is to obtain the ROW for cable line routes, space for downtown substations and satisfy the environmental protection caused by NIMBY phenomena. Unfortunately, it is expected that this situation will get more and more worse. As the HTS technology to apply in power system Is developed, HTS cable utilizing mass-capacity characteristic can be a useful countermeasure to overcome this problem. This paper describes the application methodology of 22.9kV HTS cable with low-voltage, mass-capacity characteristics replacing the 154kV conventional cable. By applying 22.9kV HTS cable, the HTS transformer with higher capacity for the reduction of space and transformer numbers of downtown substation is necessary. Also, if the leakage Impedance of HTS transformer is same as or lower than that of conventional transformer, the fault current of 22.9kV bus will increase because the HTS transformer capacity is larger than that of the conventional transformer. This means the parallel application of HTS-FCL to reduce the fault current in addition to the HTS cable and transformer can be necessary. With the basic construction scheme of new distribution system, this paper describes the future study points to realize this new distribution system using HTS equipments.

• 한국해안·해양공학회논문집
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• 제21권2호
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• pp.127-135
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• 2009

Reid and Kajiura(1957)은 해저면에 무한한 깊이의 투수층이 존재할 경우에의 파의 감쇠율을 유도하였다. 본 연구에서는 유한한 깊이의 투수층이 존재할 경우에의 파의 감쇠율을 선형파이론을 이용하여 유도하였다. 그리고 이를 확장하여 해저면에 재질이 다른 2 층 또는 3 층의 투수층이 존재할 경우에 파의 감쇠율을 제시하였다. 다음으로 이를 완경사 방정식에 적용하여, 해저면에 투수층이 존재할 경우에의 파의 투과율을 계산하였으며, 1층 투수층이 존재할 경우의 수치계산결과를 Flaten and Rygg(1991)의 적분식 방법과 비교하여 검증하였다.

• 한국생산제조학회지
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• 제21권6호
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• pp.946-953
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• 2012

When water shortage has been getting worse recently, toilet water-saving is one of the most effective way to solve the water shortage. Therefore, in this study, toilet flushing performance was investigated with VOF(Volume Of Fluid) model to obtain the basic design data for the development of high-efficiency toilets. The result showed that the shorter trapway, the longer the flushing duration time. However, the shorter trapway is found to have disadvantage in exhausting dirt due to relatively weak siphon and higher curvature. Since the remaining water in a trapway appears to help siphon, it is also an important factor in developing high-efficiency toilets. Although higher water level in the water tank shows better performance in flushing, lower water level is preferred to save water. Too low water level may cause dirt to clog the trapway due to relatively weak siphon.

• 한국경영과학회:학술대회논문집
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• 한국경영과학회 2004년도 추계학술대회 및 정기총회
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• pp.35-38
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• 2004

Global competitive pressures are asking industrial companies to find the best way to meet their customer's requirements, reduce the costs of products, and increase productivity. Quality improvement has been proposed and implemented as a primary means of achieving these purposes. The quality improvement usually includes a goal of reducing the costs due to poor quality. While these costs of poor quality (COPQ) are not known precisely, they are known to be very high. Also, they may be underestimated by the hidden costs due to non-value activities, such as potential lost sales, costs of redesign due to quality reasons, and extra manufacturing costs due to defects, etc. In any manufacturing or service operation, all actions and resource expenditures of a company should be focused on creating value for customers. Any activity or resource of not creating the value for customers could be regarded as waste, which consequently causes the COPQ. Some companies did use dashboards to understand and identify value added or non-value added activities in order to reduce or eliminate wastes. These dashboards must be properly designed to consider inherent differences in manufacturing or service operations among business organizations. In addition, a structured quality improvement program such as the Six Sigma must support these dashboards. In this paper, a case study of designing dashboards for evaluating and reporting the COPQ in business units is presented.

• 한국응급구조학회지
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• 제16권2호
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• pp.75-89
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• 2012

Purpose : This research was designed to provide basic data for advanced pre-hospital airway management by comparing the time to ventilation and success rate for tracheal intubation performed with Macintosh laryngoscope and intubating Laryngeal Mask Airway(ILMA) in a manikin. Methods : All participants were novice users among EMT-Paramedic students and were divided into two groups: (1) the group for Macintosh laryngoscope guided tracheal intubation(MLG-TI) (2) the group for ILMA guided tracheal intubation(ILMA-TI). After an introductory lecture and demonstration, each group made an attempt ten tracheal intubation to compare the ventilation time and success rate for tracheal intubation. Results : 1) There was significant difference in the time to ventilation through MLG-TI, the time to first and second ventilation through ILMA-TI of the 10 attempts. 2) The time to first ventilation through ILMA-TI was significantly shorter than that of ventilation through MLG-TI. 3) There was no significant difference between the time to ventilation through MLG-TI and the time to second ventilation through ILMA-TI. 4) The success rates of ILMA-TI were significantly higher than those of MLG-TI. Conclusion : ILMA-TI can be an alternative method for MLG-TI in advanced pre-hospital airway management.

• 한국응급구조학회지
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• 제16권3호
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• pp.19-28
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• 2012

Purpose : The present study was designed to provide basic data for advanced pre-hospital airway management by comparing the insertion time and success rate between laryngeal tube suction II (LTS II) and laryngeal mask airway (LMA) in a manikin. Methods : A total of 32 participants were novice users to both of devices among paramedic students. After taking the introductory lecture and demonstrations, the participants made an attempt to insert the LTS II and LMA to compare the insertion time and success rate. They marked the easiness of insertion of the score ranged from 1 to 10 score scale and preference of the two devices. Results : The insertion time of the LTS II was significantly shorter than that of the LMA (p =.000). There was no significant difference between LTS II and LMA in the success rate. In the easiness of insertion, the score of LTS II $(8.47{\pm}1.41score)$ was significantly higher than that of LMA $(7.19{\pm}1.98score)$(p =.001). The preference of LTS II (75%) was much higher than that of LMA (25%). Conclusion : The manikin study data showed that the LTS II may be a good alternative airway device for providing and maintaining a patent airway.