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나원상(Won-Sang Ra),신효상(Hyo-Sang Shin),정보영(Bo-Young Jung),황익호(Ick-Ho Whang) 대한전기학회 2019 전기학회논문지 Vol.68 No.1
This paper deals with the problem of generating the energy optimal trajectory which is intended to enhance the target tracking performance of a passive homing missile. Noticing that the essence of passive target tracking is the range estimation problem, the target information gathered by passive measurements can be readily analyzed by introducing the range estimator designed in line-of-sight(LOS) frame. Moreover, for the linear filter structure of the suggested range estimator, the cost function associated with the target information is clearly expressed as a function of the line-of-sight rate. Based on this idea, the optimal missile trajectory maximizing the target information is obtained by solving the saddle point problem for an indefinite quadratic cost which consists of the target information and the energy. It is shown that, different from the previous heuristic approaches, the guidance command producing the optimal passive homing trajectory is produced by the modified proportional navigation guidance law whose navigation constant is determined by the weighting coefficient for target information cost.
부인과 수술 후 Ondansetron 과 병용한 Dexamethasone 의 오심 , 구토 예방과 제통 효과의 비교
이기흥(Kee Heung Lee),신효상(Hyo Sang Shin),전영훈(Young Hoon Jeon),김시오(Si Oh Kim),홍정길(Jung Gil Hong) 대한통증학회 2001 The Korean Journal of Pain Vol.14 No.1
N/A Background: Postoperative nausea and vomiting (PONV) are common after general anesthesia and patient controlled analgesia (PCA) using opioids. This study was designed to compare the effectiveness of ondansetron plus dexamethasone versus ondansetron alone in the prevention of PONV in a patient undergoing a PCA. Methods: We studied 166 ASA I, and II in-patients undergoing general anaesthesia for major gynecological surgery. After induction of anesthesia, Group 1 (n 64) received intravenous (IV) dexamethasone 10 mg and Group 2 (n 102) received IV saline 2 ml before the surgical incision. Each patient received IV meperidine 50 mg as a loading dose. Meperidine 5 mg/kg, ketorolac 3.6 mg/kg and ondansetron 8 mg diluted in 40 ml solutions were connected to PCA pump for postoperative pain control. Mean arterial blood pressure, heart rate, pain score and symptom-therapy score were checked at 1, 4, 8, 16, 24, and 36 hours after the PCA connection. Results: For Group 1 and Group 2, respectively, the overall incidence of PONV was 12.5% and 23.5%. The pain scores were lower in patients receiving a combination of ondansetron and dexamethasone than those on ondansetron alone at 4 hr (P < 0.05), 8 hr (P < 0.05) and 16 hr (P < 0.05). Conclusions: This study suggests that the combination of ondansetron and dexamethasone is not more effective than ondansetron alone in the prevention of postoperative nausea and vomiting in women having PCA following major gynecological surgery but is more effective for pain control.
윤형주(Hyungjoo Yoon),신효상(Hyo-Sang Shin),탁민제(Min-Jea Tahk) 한국항공우주학회 2008 韓國航空宇宙學會誌 Vol.36 No.11
본 논문에서는 일반적인 타원 궤도상에서의 두 위성체간의 랑데부와 도킹을 수행하기 위한 적응 제어기법을 개발하였다. 직교좌표계를 이용해서 나타낸 두 비행체간의 상대운동방정식을 일반적인 해밀토니안 운동방정식의 형태로 변환한 후, 불확실한 시스템 파라미터를 가진 동적시스템을 위해 개발된 적응제어기법을 적용하여 제어 알고리즘을 유도하였다. 시스템 파라미터를 추정하는데 투사기법을 적용하여 파라미터 추정값의 변화에 의한 특이점을 회피할 수 있도록 하였으며, 수치해석을 통하여 추적비행체의 질량이 불확실한 경우에 대하여 제어 알고리즘의 성능을 검증하였다. An adaptive control algorithm for spacecraft rendezvous and docking in a Keplerian orbit is presented. The equations of relative motion of two spacecrafts expressed in a local-vertical-local-horizontal rectangular frame are converted to a general Hamiltonian form, then an adaptive control method developed for the uncertain Hamiltonian system is applied to the rendezvous and docking problem. A smooth projection algorithm is applied to keep the parameter estimates inside a singularity-free region, and a numerical example shows that the developed controller successfully deals with the unknown mass of the chaser spacecraft.