120미리 운동에너지탄용 소진탄피 조성이 연소 특성에 미치는 영향

권순길,황준식,최상경,김진석,Kwon, Soon-Kil,Hwang, Jun-Sik,Choi, Sang-Kyung,Kim, Jin-Seok 한국군사과학기술학회 2005 한국군사과학기술학회지 Vol.8 No.4

The burning rates of combustible cartridge cases(CCCs) of 120mm kinetic energy ammunition were measured by CBT(Closed Bomb Tester). The burning coefficient was 1.4 for CCC fabricated by Post Impregnation(PI) process, and 1.0 for that by Beater Additive(BA) process. The BA process CCC showed the fixed burning coefficient of 1.0 in spite of changing the composition of CCC. As the Korean Future Main Battle Tank is requiring the high penetration performance compared with that of KlAl tank ammunition(K276), CCC was designed to have higher impetus composition than that of K276 composition(525J/g). The optimum impetus was 600J/g when considering the increases of pressure and muzzle velocity with increasing impetus. When impetus of CCC by changing the composition increased from 525J/g to 600J/g, the muzzle velocity of 12m/s at pressure increase of 3500psi increased in case of using SCDB propellant.

The Incidences and Characteristics of Various Cancers in Patients on Dialysis: a Korean Nationwide Study

권순길,한정호,김혜영,강길원,강민석,Yeonkook J. Kim,민진수 대한의학회 2019 Journal of Korean medical science Vol.34 No.25

Background: The numbers of patients on dialysis and their life expectancies are increasing. Reduced renal function is associated with an increased risk of cancer, but the cancer incidence and sites in dialysis patients compared with those of the general population require further investigation. We investigated the incidences of various cancers in dialysis patients in Korea and used national health insurance data to identify cancers that should be screened in dialysis clinics. Methods: We accessed the Korean National Health Insurance Database and excerpted data using the International Classification of Disease codes for dialysis and malignancies. We included all patients who commenced dialysis between 2004 and 2013 and selected the same number of controls via propensity score matching. Results: A total of 48,315 dialysis patients and controls were evaluated; of these, 2,504 (5.2%) dialysis patients and 2,201 (4.6%) controls developed cancer. The overall cancer risk was 1.54-fold higher in dialysis patients than in controls (adjusted hazard ratio, 1.71; 95% confidence interval, 1.61–1.81). The cancer incidence rate (incidence rate ratio [IRR], 3.27) was especially high in younger dialysis patients (aged 0–29 years). The most common malignancy of end-stage renal disease patients and controls was colorectal cancer. The major primary cancer sites in dialysis patients were liver and stomach, followed by the lung, kidney, and urinary tract. Kidney cancer exhibited the highest IRR (6.75), followed by upper urinary tract (4.00) and skin cancer (3.38). The rates of prostate cancer (0.54) and oropharyngeal cancer (0.72) were lower than those in the general population. Conclusion: Dialysis patients exhibited a higher incidence of malignancy than controls. Dialysis patients should be screened in terms of colorectal, liver, lung, kidney and urinary tract malignancies in dialysis clinics.

관상동맥 질환 및 맥압이 신부전 진행에 미치는 영향

권순길,김상현,이정익,서장원,장재원,김순배,박정식 대한신장학회 2003 Kidney Research and Clinical Practice Vol.22 No.3

Background:Patients with end-stage renal disease have farther excess rate of coronary artery disease (CAD) than nonuremic population. There is a possibility that atherosclerosis may aggravate renal insufficiency, but it is not certain. Pulse pressure was also significantly increased in patients with chronic renal disease (CRD), and had been implicated in the development of atherosclerosis. The purpose of this study is to identify the association of atherosclerotic CAD and pulse pressure with renal disease progression in patients with mild CRD Methods:The patients with mild CRD who had been followed up more than 3 years in Asan medical center, Seoul, Korea, were included. We evaluated their CAD via coronary angiography, and followed up their serum creatinine levels and other parameters assumed to be associated with progression of CRD. All clinical and laboratory parameters were analyzed by multivariate logistic method. And we examined the association between pulse pressure and progression of CRD with related factors via multivariate logistic analysis. Results:Total 87 patients (54 were men and 33 were women) were included in this study. 45 patients had coronary heart disease and 42 had not. Comparison of CRD progression between the patients who had CAD (n=45) and those who had not (n=42) showed a significant difference (76% vs 52%, p< 0.05). Mean arterial pressure, pulse pressure, presence of diabetic nephropathy, 24hour urine protein, total cholesterol were the parameters associated with the progression of CRD. Among of them, proteinuria and mean arterial pressure were independent risk factors for renal disease progression. There was a significant association between CAD and pulse pressure. Conclusion:Atherosclerotic CAD and increased pulse pressure were associated with renal disease progression in the patients with mild renal insufficiency. 배 경:만성신부전에서 관상동맥 질환의 유병률은 정상인에 비해 증가되어 있으며 죽상경화증이 신기능을 저하시킬 수도 있다고 생각되나 아직까지 이에 대한 정확한 보고는 되어있지 않다. 맥압은 죽상경화의 정도를 반영하며 신부전 환자에서 증가되어 있어, 이에 저자들은 죽상동맥경화에 따른 관상동맥 질환과 맥압의 변화가 신부전을 진행시키는지에 대한 관련성을 비교 검토하고자한다. 방 법:서울아산병원에서 3년 이상 추적 관찰이 가능하였던 경증의 만성신부전 환자들을 대상으로 심혈관조영술로 관상동맥질환 여부를 검사하였고 혈청 크레아티닌 농도 및 여러 변수들을 추적 관찰하여 관상동맥질환의 유무에 따른 신부전의 진행 여부를 비교하였으며, 다변량회귀분석을 통해 신부전을 진행시킬 수 있는 여러 변수들의 관련성 여부를 검토하였다. 또한 맥압의 증가가 신부전에 주는 영향 및 이와 관련된 여러 변수들을 비교 분석하였다. 결 과:전체 87명 (남자 54 여자 33명)의 환자들 중 45명이 관상동맥질환이 있었으며 42명은 없었다. 관상동맥질환이 있던 45명 중 34명 (76%)에서 신부전이 진행되었으며, 관상동맥질환이 없는 42명 가운데는 22명 (52%)이 신부전의 진행을 보였다. 여러 요인들 중 신부전의 진행과 유의하게 관련된 요인으로는 평균 동맥압, 맥압, 당뇨병성 신증, 24시간 요단백, 혈청 총 콜레스테롤 농도가 있었으며 그들 중 특히 맥압이 관상동맥질환과 관련이 있었다. 결 론:죽상경화에 의한 관상동맥질환 및 맥압의 증가는 경도의 만성신부전 환자에서 신부전의 진행과 유의한 관련이 있는 것으로 사료된다.

RDX를 함유한 니트로셀루로스 조성 총포 추진제의 열적 및 강내탄도 특성

권순길,황준식,박민규,김명섭,Kwon, Soonkil,Hwang, Junsik,Park, Minkyu,Kim, Myeongseop 한국군사과학기술학회 2017 한국군사과학기술학회지 Vol.20 No.4

To develop a gun propellant composition with high insensitivity and high energy, we formulated a composition by adding RDX into the nitrocellulose(NC) based propellant. The flame temperature of the RDX added NC(RAN) propellant was higher than that of neat NC propellant. The kinetic muzzle energy of RAN propellant was close to that of JA2 propellant at room temperature($21^{\circ}C$). The difference of kinetic muzzle energy of RAN propellant between high and room temperature settings as well as between a low and room temperature settings were less compared to those of JA2 propellant.

4경간 현수교에서의 중앙주탑 휨강성의 영향

권순길,유훈,최동호,Gwon, Sun-Gil,Yoo, Hoon,Choi, Dong-Ho 대한토목학회 2014 대한토목학회논문집 Vol.34 No.1

For simple and accurate analysis for behaviors of multi-span suspension bridges which are expected to be frequently constructed as strait-crossing bridges, the deflection theory as the peculiar theory of a suspension bridge can be applied. This paper performs a structural analysis for four-span suspension bridges using the deflection theory. Simply-supported beams with tension are used for girders and the deflections of the beams due to the vertical loads and moments at supports are calculated. The calculation is performed iteratively until the deflections satisfy the compatibility equations of cables. The results of the deflection theory analysis considering tower rigidity are compared with those of the finite element analysis for verification. Importance of the tower rigidity for four-span suspension bridges is confirmed using various compatibility equations of the cable due to variation of the constraint conditions between main cable and top of towers. In addition, the simple parametric analysis for variation of the center tower rigidity is performed.

대응탄 개방형 추진장치용 점화기개발

권순길,김창기,윤상용,Kwon, Soon-Kil,Kim, Chang-Kee,Yun, Sang-Yong 한국군사과학기술학회 2011 한국군사과학기술학회지 Vol.14 No.6

For developing the ignition device for the interceptor of Korean active protection system, the design parameters of the ignition device which should have a short ignition delay time and sufficient energy for propellant ignition were studied. The electric primer instead of mechanical primer was adopted for deceasing delay time, and ignition code was used for decreasing the time difference of flame propagation from the flame holes. The developed ignition device showed the ignition delay time of a few ms. When the designed ignition device was applied to the open-type propulsion devices, the stable interior ballistic characteristic was showed in a firing test.

예광제 조성이 연소 불꽃의 스펙트럼 및 광도에 미치는 영향

권순길,황준식,이상무,Kwon, Soon-Kil,Hwang, Jun-Sik,Lee, Sang-Mu 한국군사과학기술학회 2006 한국군사과학기술학회지 Vol.9 No.4

Computer simulation was carried out to develop the tracer composition of a high performance to be able to be observed by not only the naked eye but also the thermal imaging system attached to the weapon system. The results of computer simulation show that the optimum Mg content among the trace compositions is about 40% and the formulation consisted of Viton A has a higher flame temperature compared with that of chloride compound. But the only use of Viton A radiates a yellow light and the composition adding a chloride compound radiates the red light. The light intensity of the tracer composition involving Viton A is higher than that of chloride compound. The tracer composition involving Viton A shows more clear images in case of all tests.

금 아말감 전극을 이용한 하천 내 퇴적물 공극수 내 산소, 망간 분석시스템

권순길,홍용석 한국퇴적환경준설학회(구 한국환경준설학회) 2021 한국환경준설학회 학술대회논문집 Vol.2021 No.06

장기간의 Cyclosporine 유지 요법으로 신기능을 유지 중인 FSGS 2예

권순길,김상현,김수희,박은주,이은경,박수길 대한신장학회 2004 대한신장학회잡지 Vol.23 No.1

동일 환자의 위 전정부와 체부에서 분리한 Helicobacter pylori 유전자형의 다양성

권순길,박선미,채희복,윤세진,신경섭,손보라,우찬원,유상렬,김석용 대한내과학회 1999 대한내과학회 추계학술대회 Vol.57 No.-