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운동에너지 탄에 따른 전투시스템 내의 순간화재발생에 대한 해석적 연구
이승철(Lee Seung-Chul),전우철(Jeon Woo-Chul),이해평(Lee Hae-Pyeong),이헌주(Lee Heon-Joo),이창현(Lee Chang-Hyun) 제어로봇시스템학회 2012 제어로봇시스템학회 합동학술대회 논문집 Vol.2012 No.7
본 연구는 외부 위협탄에 의한 전투시스템의 취약성을 분석하기 위한 선행연구로써, 운동에너지 탄의 종류에 따른 가상의 전투차량 내부에 적재포탄에서 순간화재발생 여부에 대한 전산해석을 수행하였다. 본 해석은 Autodyn 프로그램을 사용하였으며 순간화재발생을 판단하기 위해 Lee-Tarver ignition and growth model을 이용하였다. 본 계산에서 운동에너지 탄은 type A와 type B 두 가지로 설정하였고, 고폭탄은 COMPB, TNT 및 PBX9404를 설정하였다. 전산해석 결과, 고폭탄의 재질이 TNT와 PBX9404가 COMPB 재질보다 순간화재발생 확률이 상당히 높음을 알 수 있고 type B의 운동에너지 탄이 type A 보다 순간화재발생 확률이 다소 높음을 알 수 있었다.
철갑소이탄에 의한 전투시스템 내 적재포탄의 순간화재에 관한 전산해석
이승철(Lee, Seung-Cheol),전우철(Jeon, U-Cheol),이해평(Lee, Hae-Pyeong),이헌주(Lee, Heon-Ju) 한국화재소방학회 2013 한국화재소방학회 학술대회 논문집 Vol.2013 No.추계
본 연구에서는 철갑소이탄이 장갑을 관통한 후 전투시스템 내의 적재포탄(고폭탄 또는 추진제)에 피탄되었을 때 순간화재 발생확률에 대해 전산해석을 수행하였다. 장갑은 RHA 재질로 설정하였고, 장갑 두께를 5~30 mm까지 5 mm씩 증가시키며 전산해석을 실시하였다. 고폭탄은 COMPB, TNT, PBX가 사용되었으며 추진제는 ANB가 사용되었다. 본 해석은 Autodyn 프로그램을 사용하였으며, 순간화재 발생 여부를 해석하기 위해 Lee-Tarver ignition and growth model을 사용하였다. 해석 결과, 철갑소이탄이 고폭탄 TNT와 PBX에 피탄되었을 때, 순간화재 발생확률이 모두 100%를 나타내었으며, 고폭탄 COMPB의 경우, 0.8~0.08%로 나타났다. 추진제 ANB의 순간화재 발생확률은 3.8~3.6%로 나타났다.
운동에너지 탄과 적재포탄에 따른 전투시스템 내부에서의 순간화재발생에 대한 전산해석
이승철,전우철,이해평,이헌주,Lee, Seung-Chul,Jeon, Woo-Chul,Lee, Hae-Pyeong,Lee, Heon-Joo 한국군사과학기술학회 2013 한국군사과학기술학회지 Vol.16 No.6
In this paper, numerical analysis was performed about whether the flash fire of loaded shells breaks out in the virtual combat vehicle according to sorts of the kinetic energy ammunition as the preceding research for vulnerability analysis inside the combat system by an external threaty ammunition. In this simulation, Autodyn program was used and the Lee-Tarver ignition and growth model was used to determine the flash fire outbreak. In this study, the kinetic energy ammunition was set of type A and type B in two kinds and the loaded shells was set of COMPB, TNT, PBX9404 and ANB. As a result, TNT and PBX9404 have much higher flash fire probability than COMPB in high explosive, ANB has very low flash fire probability.
이헌주(Heon Ju Lee),이재련(Jae Lyun Lee),이재춘(Jae Chun Lee),이은정(Eun Jung Lee),김기범(Ki Beom Kim),임상우(Sang Woo Lim),이동준(Dong Jun Lee),전경진(Kyeoung Jin Jeon),조영복(Young Bog Cho),도갑석(Gab Suk Doh),서정일(Jeong Ill Suh) 대한내과학회 1995 대한내과학회지 Vol.49 No.1
N/A Objectives: 80-90% of the cases of hepatocellular carcinoma(HCC) are associated with cirrhosis. Hepatitis B virus(HBV) is known as a major etiologic factor of HCC and about 10% of Koreans are HBV carriers. And the prevalence of HCC is high in Korea. Early detection of HCC is important for the better treatment especially in the patients with cirrhosis who usually have the decreased functional hepatic reserve. Risk factors for the hepatocellular carcinoma in the korean patients with cirrhosis were evaluated. Methods: Risk factors for hepatocellular carcinogenisis such as age, sex, ascites, alcohol, HBsAg, anti-HCV, AFP, ICG R(15) and risk score were investigated among the 176 patients with cirrhosis and HCC(group I) and 72 patients with cirrhosis(group II) and compared between the two groups. Results: 1) No age difference was noted between group I and group II. 2) Male to female sex ratio were 5.7: 1 and 2.4: 1 for group I and II in each(p<0.01) and the frequency of HCC among cirrhosis was higher in male than female sex(p<0.01). 3) Both HBsAg and anti-HCV positivity were significantly higher in group I than in group II (p<0.01 and p<0.05 respectively). 4) The frequencies of Child-Pugh A, elevated AFP, elevated ICG R(15) and the frequency of super-high risk patient were higher in group I than in group II(p<0.01). 5) The frequency of alcoholic patients was significantly higher in group II than in group I (p<0.05) but no difference was noted between HBsAg positive group I and group II patients. 6) The frequency of abnormal AST with the level of below 100IU was not significantly different between group I and group II. 7) The frequency of the patients with ascites was higher in group II than in group I (p<0.01). Conclusion: Risk factors for hepatocellular carcinogenesis in korean patients with cirrhosis are male, Child-Pugh A, HBsAg positivity, anti-HCV positivity, absence of ascites, higher AFP, lower ICG R15 and higher platelet count.
Prostenoglycine ( Hevapol Cap ) 투여중 동반된 부작용 및 간기능 이상
이헌주(Heon Ju Lee),서정일(Jeong Ill Suh) 대한소화기학회 1996 대한소화기학회지 Vol.28 No.5
Liver is the primary site of drug metabolism and all drugs have the potential for hepatic injury and drug-induced hepatotoxicity. Prostenoglycine(Hevapol cap.) is one of the hepatotonic drugs which is not used for any fundamental or etiological therapy and acts only as a supportive agent for hepatic disease. Prostenoglycine(Hevapol cap.) induced adverse reactions in for patients and their liver injury was analized. Prior to administration, liver function tests were normal in two patients, while the other two had underlying liver injury and abnormal liver function tests. Hypersensitivity reactions manifested were fever, chills, skin rash, pruritus and general aches. The types of liver injury for 4 patients were cholestatic, mixed, hepatocellular and mixed, respectively. However classification of liver injury according to the International Consensus Meeting on definition of drug-induced liver disorder is difficult for the patients with underlying liver disease. Even hepatotonic drugs can aggravate the liver function tests and physicians should pay more careful attention in prescription to the patients with liver disease.(Korean J Gastroenterol 1996; 28:743 - 749)
압전빔의 진동을 이용한 마이크로 동력원의 에너지 변환 해석
이헌주(Heon Ju Lee),장영수(Young-Soo Chang),이윤표(Yoon-Pyo Lee) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
We developed micro power generation system using piezoelectric materials. In our system, the ambient vibrating energy is converting to electric energy by deflection of piezoelectric beams. The system consists of energy generating parts, converting enhancement parts, electric regulation and charging parts ,and interface with small-energy-consuming mobile devices. The geometry of piezoelectric beams, the source of vibrating energy, and the electric load of target application determine the characteristics of generating electric power, such as impedance, voltage, current and power density. Therefore, we made a model for analysis of generating power with given information such as piezoelectric materials, geometry, vibration type, and mass. With this model, we can calculate capacitance of piezoelectric beams, generating voltage, current, and power. To obtain maximum energy transfer efficiency, we approached this study in the view of material, electrical, and mechanical engineering.
Anti - HBc 단독양성인 만성간질환 환자에서 중합효소 연쇄반응을 이용한 혈청 HBV DNA 의 검출 , anti - HBe 및 anti - HBc 역가
이헌주(Heon Ju Lee),서민호(Min Ho Suh) 대한내과학회 1994 대한내과학회지 Vol.46 No.4
N/A Objectives: The interpretation of isolated anti-HBc is very complex. One of the possibility is the role of a surrogate marker for low level HBV carriers, particularly in high titers of anti-HBc. Methods : Hepatitis B virus (HBV) DNA was tested in 43 objects that have antibody against hepatitis B core antigen (anti-HBc) as the isolated serological marker of HBV infection by the polymerase chain reaction (PCR). Anti-HBc titers were presented by Cut off point Counter Per Minute/Patient Count Per Minute (C/P ratios). HBV marks were tested by Abbott kits by radioimmunoassay. Results : HBV DNA was detected in 9 of 43 (20.9%) patients with liver disease. C/P ratios in 43 patients were higher (12.9±8.1) than that of normal control (4.6±0.7, p<0.005) but no difference was found between HRV DNA positive and negative group. Anti-HBe was positive in 4 of 9 HBV DNA positive objects. Conclusions : HBV DNA amplification by the PCR is the best method for the diagnosis of low level HBV carriers among isolated anti-HBc positive objects, Anti-HRc titers can not be the only way that detect low level HBV carriers any more. Anti-HBe should be checked in objects with isolated anti-HBc who are under the suspicion of low level HBV carriers. More cautions sould be payed on evaluation and management of isolated anti-HBc positive blood for the diagnosis and prevention of HBV infection by medical personell, expecially in blood bank.
간세포암에서 경동맥문맥조영중 전산화단층촬영 100예의 의의
이헌주(Heon Ju Lee),김홍진(Hong Jin Kim),장재천(Jae Chun Chang),박복환(Bok Hwan Park),조재호(Jae Ho Cho),한건수(Kon Soo Han),심민철(Min Cheol Shim),권굉보(Kyung Bo Kwun),김태년(Tae Nyon Kim),정문관(Mun Kwan Jung) 대한소화기학회 1993 대한소화기학회지 Vol.25 No.5
N/A We retrogradely analized the meannings of computed tomography during arterial portography (CTAP) compared with conventionally contrast enhanced computed tomography (conventional contrast CT) taken in 100 cases of hepatocellular carcinoma. We could find 57.8% additional borderline. lesions with CTAP in number of patients and 92.5% in numbers of masses. Portal vein invasion which was not demonstrated by conventional contrast CT could be detected by CTAP in 10 cases. In diagnosis of unilatral or bilateral lobe involvement for determinantion of treatment planning, CTAP could prevent 35.5% of mis-underdiagnosis of unilateral lobe involvement by demonstrating the nodule and/or portal vein invasion cf controlateral lobe. In conclusion, CTAP is very usefuI in detection of hidden borderline lesion, portal vein invasion, and recognition of portal venous flow nature in preserved portion of liver. Therefore CTAP is considered essential in pretreatment evaluation of hepatocellular carcinoma for determination of proper treatment principles.
이헌주(Heon Ju Lee),이현우(Hyun Woo Lee),윤봉영(Bong Young Yoon),김종명(Jong Myung Kim),김정회(Jung Hee Kim),곽철승(Chul Sung Kwak) 대한소화기학회 1989 대한소화기학회지 Vol.21 No.2
N/A Evaulation of serum bile acids has been used for prediction of abnormal serum liver profile in the world. But recently many reported that bile acids in a random sample of urine (URNBA), corrected for urine flow with creatinine, have high diagnostic value when compared with serum bile acid and routine serum liver tests. We analyzed URNBA as a predictor of liver abnormality in 27 subjects of various liver disease and 8 normal subjects and compared with the results of serum bile acids and routine serum liver profile. In the patients, the rates of abnormal elevation of URNBA and serum bile acid were 85.2% (23/27) and 74.1% (20/27), respectively. URNBA/creatinine in the random sample of urine revelaed the highest reliability that reflects the presence of liver disease. So we think that urine can be used to predict liver diasese with an accurary that equals or exceeds the serum bile acid and the routine liver tests.