http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
양수석(Soo Seok Yang) 한국추진공학회 2019 한국추진공학회 학술대회논문집 Vol.2019 No.11
아폴로 11호의 달 착륙으로 우주여행에 대한 꿈이 현실로 실현될 것만 같았으나, 50년이 지난 지금도 우주는 인류의 자유로운 접근을 쉽게 허용하지는 않고 있다. 다만, 최근 들어서 ‘New Space’라는 기치 아래 민간 주도로 우주에 대한 상업적 활용의 폭이 점차 커지고 있고, 이에 따라 우주여행과 이를 실현 할 수 있는 우주비행기의 개발도 상당한 진척을 보이고 있다. 본 연구에서는 우주비행기의 형태 중에서 현실적으로 가장 실현 시기가 빠를 것으로 예측되는, 로켓엔진을 이용한 TSTO (Two Stage To Orbit)형 우주비행기로서, SpaxeX가 현재 개발을 진행하고 있는 BFR 비행체를 대상으로 하여 발사비용을 분석한다. 발사비용은 6가지의 세부비용으로 나누어 계산하며 각각의 비용은 TRANSCOST의 비용 추정식 등을 이용하여 계산한다. The historic moon landing of Apollo 11 made mankind to fall into illusion that the space journey would be realized in an instant. Fifty years after, however, the unconstrained and non-specific space access of mankind has not been still allowed. Fortunately, as many commercial parties are recently taking the initiative in enlarging the economic utilization of space under the flag of ‘New Space’, the new business of space, for example such as global satellite service, space resource mining, space tourism and son on, comes into the spotlight. Therefore, the space plane to realize the space journey is being also focused, and significant progress has been made in its development. In this research, the launch cost analysis of space plane is conducted for the BFR vehicle, TSTO space plane using rocket engines, that is under development by SpaceX because its successful commercialization is generally forecast to come true in nearest future. The total launch cost is divided into 6 subsections costs which are calculated by using the cost estimation relationships of TRANSCOST and others.
양수정(Soo Jung Yang),윤오준(Oh Joon Yoon),박경수( 대한통증학회 1998 The Korean Journal of Pain Vol.11 No.1
N/A Background: Quality of postoperative care may be improved by management of postoperative pain. Epidural anesthesia and analgesia have several advantages over general anesthesia and parenteral analgesics in managing the postoperative pain. We retrospectively reviewed records of obstetrical patients who underwent the cesarean sections under epidural anesthesia to evaluate perioperative analgesic use, side effects, and complications. Methods: All patients received epidural anesthesia consisting of 0.25% bupivacaine, 2% lidocaine and 100 μg fentanyl, followed by epidural analgesia with 0.1% bupivacaine and 12.5 μg/ml fentanyl at rate of 2 ml/hr for 48 hours. Patients records were reviewed for: medications administered for pain relief, incidence of nausea and vomiting and pruritus, and presence of respiratory or cardiovascular depression. Results: Over 18 months, 1,054 patients' records were reviewed. Average age was 27.8 years (18-43 years). 768 patients (72.9%) received no additional drugs for the pain relief. Intramuscular analgesics, ketoprofens, were one time administered to 247 patients (23.4%), 39 patients (3.7%) received two more dosages. The time of administration was 8.3+4.3 hours postoperatively. Antiemetics, for example, low-dose droperidol, were administerd one time for 160 patients (15.2%), 5 patients (0.5%) received two or more administrations. The medication was administered 5.1+4.2 hours postoperatively. Drugs for relief of pruritus, low-dose naloxone, were administered one time for 108 patients (10.2%), 10 patients (0.9%) received 2 or more dosages. The time of administration was 6.3+4.2 hours postoperatively. None of the patients experienced cardiovascular nor respiratory (<8 breath/min) depression. Conclusions: Postoperative continuous epidural analgesia in combination with bupivacaine and fentanyl is an effective method of providing postoperative analgesia with low incidence of side effects.
양수광(Soo Kwang Yang),송해은(Hae Eun Song),진혁(Hyuk Jin),강율호(Yul Ho Kang) 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6
The purpose of this study was to analyze the pressure drop characteristics according to the size, cell height, material, and air volume of the total heat exchange element, which is a key component of the heat recovery ventilation system, to establish data that can be applied when designing a ventilation system including a heat exchange element. As a result of comparing the pressure drop in the common flow range (150~350CMH) of heat exchange elements of different sizes, the pressure drop of the 250mm heat exchange element increased 43~81% compared to the 350mm heat exchange element. The 150mm heat exchange element increased by 200-450% compared to the 350mm heat exchange element.