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심대성,장덕현,박차환,김정훈,Shim, Daisung,Jang, Deakhyeon,Park, Chahwan,Kim, Jounghun 한국군사과학기술학회 2015 한국군사과학기술학회지 Vol.18 No.4
This is a study for the improvement of the fractured lug structure that connects the landing gear to the fuselage of the aircraft using the composite leaf spring landing gear. The lug surface was analyzed to find out the cause of fracture. The lug was destroyed by the crack initiation and propagation under the repeated stresses. The frictional wears of the lug structure were proceeded and that affected adversely to the crack. Also, the square protrusion of the lug has a weak shape to bring about stress concentration. The design changes were conducted and the test was performed to verify changed design results.
심대성,김만태,염효원,임동민,김영진,엄원섭,Shim, Daisung,Kim, Mantae,Yeom, Hyowon,Im, Dongmin,Kim, Youngjin,Uhm, Wonseop 한국군사과학기술학회 2016 한국군사과학기술학회지 Vol.19 No.6
This is a study for the improvement of the defected elevator spar in operating aircraft. The elevator spar web holes were analyzed to find out the cause of the cracks. The fatigue striations were observed and the cracks occurred by the repetitive stresses during the elevator works. Also the outboard connection structure of the elevator and horizontal stabilizer was more weak shape than the inboard. The design changes were recommended and the analyses were performed to verify the improvement of the changed shapes.
안드로이드 모바일 기기 암호화폐 개인 지갑 앱아티팩트 분석연구
심대성,이상진,윤지원 한국디지털포렌식학회 2024 디지털 포렌식 연구 Vol.18 No.1
최근 암호화폐를 범죄 수익금으로 악용하는 범죄가 증가하고 있다. 특히, 범죄자가 안드로이드 모바일 기기에 설치한 지갑앱을 이용하여 암호화폐를 보관하고 있는 경우에는 수사기관으로의 암호화폐 전송 등을 거부하거나 암호화폐 개인키와 관련된 비밀번호 제출을 거부하면, 수사기관에서는 암호화폐 지갑에 접근할 수가 없기 때문에 몰수 및 범죄 거래행위 주체 특정에 어려움이 있다. 본 연구에서는 안드로이드용 암호화폐 개인 지갑 앱 아티팩트를 분석하였고, 각 앱에서 지갑 사용자의 거래 행위와 관련한 데이터가 저장된 파일을 분석 대상 기기의 파일시스템에서 추출해내고, 이를 분석하여 아티팩트를 추출해주는 프로그램(AndroidWalletAnlayzer)을 제작하였다. 이를 활용하면 안드로이드 환경에서 설치하여 사용 가능한 6가지 지갑 앱을 대상으로 지갑 주소, 거래내역, 지갑 사용관련 시간 데이터 등에 관한 아티팩트를 자동으로 추출할 수 있다. 이러한 결과는 단순히 범죄와 관련된 암호화폐 거래내역만으로는 알 수 없는 데이터로서 암호화폐 거래 발생 내역을 입증하고, 범죄 혐의의 주체를 특정하는 것에 도움이 될 것이다. Recently, crimes abusing cryptocurrency as criminal proceeds have been on the rise. In particular, if a criminal is storing cryptocurrency using a wallet app installed on an Android mobile device, and then to transmit the cryptocurrency to an investigative agency or refuses to submit the password related to the cryptocurrency private key, because investigative agencies cannot access cryptocurrency wallets, it is difficult to confiscate them and identify the subjects of criminal transactions. In this study, artifacts from cryptocurrency personal wallet apps on Android were analyzed, files containing data related to wallet users' transaction behavior in each app were extracted from the file system of the device being analyzed, and created a program(AndroidWalletAnlayzer) that analyzes them and extracts artifacts. Using this, you can automatically extract artifacts about wallet addresses, transaction details, time data related to wallet use, etc. for the six wallet apps that can be installed and used in the Android environment. These results are data that cannot be known simply from the cryptocurrency transaction details related to crime, and will help prove the history of cryptocurrency transactions and identify the subject of criminal charges.
선판일,이길호,심대성,성영훈,장대수 朝鮮大學校 附設 醫學硏究所 1992 The Medical Journal of Chosun University Vol.17 No.2
During the last 33 months period between June, 1989 and March, 1992 Extracorporeal shock wave lithotripsy (ESWL) was performed 275 patients with lower ureteral stone by Northgate SD-3 Litho-triptor. Stone localization was done by ultrasonography and diazepam & fentanyl citrate was used intravenously to control pain during procedure in all patients. The success rate of treatment (rate free of calculi plus that of clinically insignificant residual fragment) was 98.1% below lO㎜ in stone size, 95.7% in ll-20㎜, 87.5% in 21-30㎜, 50% over 31㎜ and total mean success rate was 96.7%. Among the ESWL-failed 9 cases, ureterolithotomy was done in 5 cases, ureterorenoscopy in 2 cases and ston basket in 2 cases. Complications after ESWL were transient hematuria 100%, flank pain 7.3% and fever 1.8% and treated conservatively. Extracorporeal shock wave lithotripsy monotherapy with the Northgate SD-3 lithotriptor was considered to be effective and safe procedure for the initial treatment of lower ureteral stone.
장현익,박성곤,심강희,최종보,이정환,조대성 대한배뇨장애요실금학회 2014 International Neurourology Journal Vol.18 No.3
Purpose: In this study, we examined the difference in the treatment efficacy depending on the sympathetic activity in men with lower urinary tract symptoms (LUTS). Methods: In the current single-center, retrospective study, we evaluated a total of 66 male patients aged 40–70 years of age, presenting with LUTS, whose International Prostate Symptom Score (IPSS) exceeded 8 points. They had a past 3-month history of taking alfuzosin XL, and their heart rate variability (HRV) was measured before and after the treatment. In addition, we also recruited 39 healthy volunteers who visited a health promotion center for a regular medical check-up. They were aged between 40 and 70 years and had an IPSS of <8 points. We divided the patients with LUTS into two groups: the groups A and B, based on a low frequency/high frequency (LF/HF) ratio of 1.7, which was the mean value of the LF/HF ratio in the healthy volunteers. After a 3-month treatment with alfuzosin XL, we compared treatment outcomes, based on the IPSS and peak urine flow rate, between the two groups. Results: A 3-month treatment with alfuzosin XL, comprising the measurement of the HRV, was performed for the 23 patients of the group A (23/38) and 17 of the group B (17/28). After a 3-month treatment with alfuzosin XL, total IPSS and IPSS questionnaire 2 and 5 were significantly lower in the group A as compared with the group B. But this was not seen in the group B. Furthermore, there were no significant differences in other parameters, such as maximal flow rate and IPSS storage subscore, between the two groups. Conclusions: Our results indicate that the treatment efficacy was lower in patients with sympathetic hyperactivity as compared with those with sympathetic hypoactivity. Thus, our results will provide a basis for further studies to clarify causes of LUTS in a clinical setting.
이기영,김성근,심대성,김미정,권기정 한국항공우주학회 2015 한국항공우주학회 학술발표회 논문집 Vol.2015 No.11
수리온 연구개발 사업의 성과분석을 위해 투입 비용을 조사하고, 산업파급효과 계수를 적용하여 생산유발효과, 부가가치유발효과 및 고용창출효과 분석을 실시하였다. 그리고 기술적 유사도와 공헌도 조사를 통하여 항공우주산업, 방위산업과 민간산업 시장에 대한 향후 기술파급효과를 측정하였다. This paper deals with the economic effects for the Surion(KUH-1) development program. The economic effects was measured by Inter-industry analysis method for production-inducing effects, value-added inducement effects, and job-creation effects and by estimating actual domestic input cost. In addition, technical riffle effects was analyzed for aerospace industry, defense industry and commercial industry market through similarity and contribution of technology.
정충식,김수현,안병수,심대성,박도영,김철성,장대수 조선대학교 1994 The Medical Journal of Chosun University Vol.19 No.1
Retroperitoneal fibrosis is a fibrotic process of the retroperitoneum that frequently produces ureteral obstruction. It can occur as an idiopathic disease or in association with various non-malignant and malignant condition. In the early phase of the retroperitoneal fibrosis ; symptoms originate from the disease process itself, while in the late state the clinical features represent the effect of obstructive uropathy and renal failure. Treatment consist of steroid therapy, urinary diversion and ureterolysis with jntraperitonealization or lateralization or wrapping with omentum. Herein we present 5 cases of retroperitoneal fibrosis.