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순차 컨벡스 프로그래밍 기반 무인기 설계 형상의 성능 분석
고효상,최한림,장종윤,김준,유구현,Ko, Hyo-Sang,Choi, Hanlim,Jang, Jong-Youn,Kim, Joon,Ryu, Gu-Hyun 한국항공우주학회 2022 韓國航空宇宙學會誌 Vol.50 No.11
Sequential convex programming based performance analysis of the designed UAV is performed. The nonlinear optimization problems generated by aerodynamics are approximated to socond order program by discretization and convexification. To improve the performance of the algorithm, the solution of the relaxed problem is used as the initial trajectory. Dive trajectory optimization problem is analyzed through iterative solution procedure of approximated problem. Finally, the maximum final velocity according to the performance of the actuator model was compared.
스크램제트 추진 시스템 모델링을 통한 유동 특성 산출 알고리즘에 대한 연구
고효상(Hyosang Ko),최한림(Hanlim Choi) 한국추진공학회 2019 한국추진공학회 학술대회논문집 Vol.2019 No.11
공기 흡입식 극초음속 비행체인 스크램제트의 모델링과 그에 대한 유동 특성 산출 알고리즘에 대해 연구했다. 설계된 모델에 생기는 충격파 형상과 연소 현상을 가정한 대기 조건과 연료에 대해 분석하였고, 이를 통해 다양한 비행조건에서 동체에 발생하는 힘과 모멘트를 분석하였다. 분석한 모델에 대해서 비행 정보 획득을 위한 알고리즘에 대해 연구했으며 다양한 비행조건과 알고리즘을 통해 추정한 비행 정보를 비교해 보았다. The modelling of air-breathing hypersonic vehicle and it’s air data acquisition algorithm were studied. Under various flight conditions, force and moment were calculated through the analysis of shock wave shapes and combustion phenomenon. In addition, the algorithm for estimating air data was presented and the result of it was compared with real air data for various flight conditions.
협업 유도탄 간 상대 충돌 각 제어 임무에서 통신 구조에 따른 유도기법의 영향 분석
고효상(Hyosang Ko),이단일(Danil Lee),이명화(Myunghwa Lee),최한림(Hanlim Choi) 항공우주시스템공학회 2024 항공우주시스템공학회지 Vol.18 No.2
정보공유 기반의 네트워크 협업 유도탄에 대한 상대 충돌 각 유도기법을 불확실성과 외란이 존재하는 시스템에 적용했다. 협업 유도탄 시스템은 전이 축소 방향성 비순환 그래프로 표현되며, 그 구조에 따라 유도된 중앙집권형 및 분산형 유도기법을 소개했다. 또한, 소개된 유도기법을 유도탄의 통신 구조와 시스템 잡음 유무에 따라 비교하여 그 관계를 분석했다. 상대 충돌 각 제어 임무에서 분산형 정보공유 유도기법의 효과를 분석하기 위해 시스템 동역학에 잡음이 포함된 다수의 유도탄이 불확실성이 포함된 예상 요격 위치에 유도되는 상황을 가정하였다. 다양한 임무 환경에 대해 몬테카를로 시뮬레이션을 수행하였으며, 이를 통해 정보공유의 유무와 구조가 시스템에 미치는 영향을 분석했다. This paper applies a relative impact angle control guidance law to a communication-based multi-missile network system with uncertainties and disturbances. The multi-missile network system is represented as a transitive reduction directed acyclic graph. Furthermore, this paper introduces both centralized and decentralized guidance laws based on the graphs structure. The relationship between these guidance laws is analyzed by comparing them based on the communication structure and the presence of system noise. To analyze the effects of decentralized optimal cooperative guidance law, this paper assumes uncertainty in missile dynamics and predicted impact point information for the relative impact angle control mission. Monte Carlo simulations are conducted for various mission environments to analyze the impact of communication and its structure on the system.
스크램제트 추진 시스템의 비행 제어를 통한 연소기의 추력 분석
고효상(Hyosang Ko),양재훈(Jaehoon Yang),여재익(Jai ick Yoh),최한림(Hanlim Choi) 한국추진공학회 2021 한국추진공학회지 Vol.25 No.1
The PID controller with fin angle and thrust as control input was designed based on the aerodynamic data of scramjet system. Flight simulation following a given trajectory which strike the target point after climb and cruise with constant dynamic pressure was conducted. After that, the required thrust for the climb and cruise was calculated and the required fuel flow rate for the hydrogen fuel dual mode scramjet combustor was analyzed. The combustor analysis of this study which conducted on integrated model of independently developed inlet, combustor, nozzles and external aerodynamic models, laying the foundation for the integrated design of the air breathing hypersonic system.
정상 면역 환자에서 췌장암으로 오인된 원발성 췌장 칸디다증
김충현 ( Chung Hyoun Kim ),이현민 ( Hyeonmin Lee ),우창곡 ( Chang Gok Woo ),한정호 ( Joung-ho Han ),최한림 ( Hanlim Choi ),박선미 ( Seon Mee Park ) 대한소화기학회 2021 대한소화기학회지 Vol.77 No.1
Pancreatic candidiasis can develop in patients with acute pancreatitis, compromised immune responses, or iatrogenic intervention. This paper reports a case of pancreatic candidiasis presenting as a solid pancreatic mass in a patient without the risk factors. A previously healthy 37-year-old man visited the emergency department with left flank pain. Abdominal CT revealed a 5 cm, irregular heterogeneous enhancing mass accompanied by a left adrenal mass. Positron emission tomography-computed tomography and endoscopic ultrasound-guided fine-needle aspiration (EUS-FNA) could not discriminate pancreatic cancer from infectious disease. A laparoscopic exploration was performed for an accurate diagnosis. After distal pancreatectomy with splenectomy and left adrenalectomy, pancreatic candidiasis and adrenal cortical adenoma were diagnosed based on the pathology findings. His condition improved after the treatment with fluconazole. This paper reports a case of primary pancreatic candidiasis mimicking pancreatic cancer in an immunocompetent patient with a review of the relevant literature. (Korean J Gastroenterol 2021;77:45-49)
Primary hepatic choriocarcinoma in a female patient
Makhmud Malikov,Eun Shin(신은),Jai Young Cho(조재영),Ho-Seong Han(한호성),You-Seok Yoon(윤유석),Young Rok Choi(최영록),Jae Yool Jang(장재율),Hanlim Choi(최한림),Jae Seong Jang(장재성),Seong Uk Kwon(권성욱),Haeryoung Kim(김혜령) 대한종양외과학회 2015 Korean Journal of Clinical Oncology Vol.11 No.1
Choriocarcinoma is a germ cell tumor belonging to the spectrum of gestational trophoblastic diseases, and occurs most commonly in the gonads. Primary hepatic choriocarcinoma is very rare, especially in females. A 59-year-old woman was referred to our clinic with a history of upper right quadrant pain lasting 1 month. Computed tomography and magnetic resonance imaging revealed a large hypervascular mass in the right liver, characteristic of angiosarcoma. The patient underwent right hemihepatectomy without unexpected events. Histopathology revealed the tumor as a choriocarcinoma, with numerous syncytiotrophoblasts. Immunohistochemistry was positive for β-human chorionic gonadotropin and CK-19, with a Ki-67 labeling index of 90%. The tumor showed focal positivity for CD31 and human placental lactogen. The patient started chemotherapy (vincristine and cyclophosphamide) on postoperative day 16. The patient’s clinical condition improved and she was discharged on postoperative day 17. Primary hepatic choriocarcinoma in female adults is a rare aggressive tumor, and further studies are needed to improve its diagnosis and treatment.
김대환(Daehwan Kim),한호성(Ho-Seong Han),윤유석(Yoo-Seok Yoon),조재영(Jai Young Cho),최영록(Youngrok Choi),장재율(Jae Yool Jang),최한림(Hanlim Choi) 대한종양외과학회 2015 Korean Journal of Clinical Oncology Vol.11 No.2
Purpose: Pancreatic surgery is challenging and associated with high morbidity. Therefore, it is important to detect it early before it becomes clinically apparent. The white blood cell (WBC) count useful as a predictive marker of postoperative pancreatic fistula. The aim of this study was to evaluate the diagnostic accuracy of WBC in predicting pancreatic fistula. Methods: Between September 2003 and December 2013, 405 patients underwent elective pancreaticoduodenectomy or pylorus preserving pancreaticoduodenectomy for periampullary malignancy. Among them, 372 patients with no preoperative leukocytosis were enrolled in this study. The serum WBC count was monitored daily until postoperative day 8. The clinic and pathological data of these patients were analyzed by reviewing medical records retrospectively. Results: Thirty patients (8%) developed pancreatic fistula grade B and C. The WBC count, measured every other day, was significantly higher every other day during the first 7 postoperative days in patients who developed pancreatic fistula grade B and C, compared with those patients who did not develop pancreatic fistula. The WBC count cutoff value of 13.07x10<SUP>9</SUP>/L, 10.37 x10<SUP>9</SUP>/L on postoperative day 1,7 yielded a sensitivity of 57%, 70%, specificity of 53%, 67% for the detection of pancreatic fistula. Conclusion: Patients with postoperative fistula grades B and C showed WBC counts that did not decrease on subsequent measurements during the early postoperative period. The measurement of WBC counts after pancreaticoduodenectomy can play a clinically important role in the early detection of pancreatic fistula development even from postoperative one day.