향상된 보안 시스템 모델에 관한 연구

韓昑希,全基煥 카톨릭대학교 성심교정 1996 論文集 Vol.3 No.-

현대 사회의 필수적 요소인 정보를 안전하게 보호하면서 다양한 서비스와 공유를 제공하기 위한 보안 시스템이 요구되어 다수의 보안 모델들이 제안 되어 있다. 본 논문에서는 이 중 정보흐름 모델인 기존의 수취-부여 보안 모델을 확장하여 보다 향상된 시스템을 제공하고자 하는 보안 모델을 제안 하였다. 수취-부여 모델은 정보의 흐름을 예측할수 있어 정보가 이동하는 경로를 그래프 형태로 파악하여 주체가 접근하고자 하는 객체를 파악할수 있고 사용자가 객체에 대한 참조를 획득할수 있는 조건을 알수 있다는 장점이 있다. 이러한 장점을 실제 시스템에 적용하고자 기존의 규칙들을 새로운 시스템 환경에 맞게 설정하여 본 논문에서 확장된 수취-부여 보안 모델을 제안 하였고 실제적인 목적 기계로는 Linux 시스템을 선정 하였다. Linux 시스템을 보다 안정된 시스템으로 재 설계하여 불법적인 파괴 및 훼손으로부터 정보를 안전하게 보존할수 있도록 하였다. 또한 이모델을 통해 보다 넓은 범위의 시스템이 적용 가능 할 수 있도록 하는 일반적인 이론을 제안하였다.

간문부 담관암 환자에서 경피경관 양측성 금속 배액관의 효과

김금래,김주형,박원규,장재천,조재호,김태년,김준화,장병익 영남대학교 의과대학 2005 Yeungnam University Journal of Medicine Vol.22 No.2

Background: The purpose of this study was to determine the effectiveness of percutaneously place self-expanding metallic stent for the relief of biliary obstruction in patients with hilar cholangiocarcinoma. Materials and Methods: From November 2001 to December 2004, 48 patients with hilar cholangiocarcinoma were prospectively studied. After percutaneous placement of bilateral self-expanding, uncovered metallic stents, follow-up evaluation was carried out until July 2005. Results: There were 4 cased of Bismuth type Ⅱ,21 cases of Bismuth typeⅢa 8 cases of Bismuth type Ⅲb and 15 cases of Bismuth type Ⅳ. Stent placement was technically successful in all patients All patients had satisfactory biliary drainage, resulting in one week drainage rate of 72.8% and final drainage of 91.9% There were 12 cases (21.3%) of abdominal pain requiring analgesics and 1 case (7.1%) of cholangitis; both were successfully managed with conservative treatments. Late complications occurred in four patient (8.3%), including two patients with cholangitis, one patient with liver abscess, and one patient with biloma; all were appropriately managed by percutaneous drainage. The average length and median durations of stent patency and median survival time were 303 days (range, 60~815) and 338 days (range, 60 ~1175), respectively. Conclusion: Placement of a percutaneous metallic stent is an effective and safe method of palliation of patients with hilar cholangiocarcinoma.

도시지역의 PM10과 PM2.5의 계절농도 및 특성에 관한 연구

김창환,전보경,최금찬 동아대학교 환경문제연구소 1999 硏究報告 Vol.22 No.2

Two sample sets per day were acquired for 12hr(12hr durations) during winter sampling and for 24hr(24hr durations) during summer sampling. Samples were measured for particle mass, heavy metal and water-soluble elements chloride, nitrate, sulfate, ammonium, sodium calcium, magnesium and potassium ions. 1. Sulfate ion per particle mass concentration was the most abundant species in the PM2.5 fraction for winter and summer. The concentration of SO^(2-)₄, Na^(+) is higher than the other ions for winter, but the concentration of NH^(-)₄ is higher than Na^(+) for summer. 2. Principal component analysis showed that major pollutant was NaCl by seasalt particulate, NaNO₃ and (NH₄)₂SO₄for winter and summer. 3. PM2.5/PM10 by mass concentration was measured 0.45 at hadan and 0.43 at bumildong for winter, but 0.62 at hadan and 0.72 at bosudong for summer. 4. PM10 and PM25 mass concentrations at the bumildong and bosudong were both on average 13 times higher than the hadan concentrations. 5. Prominent heavy metals were Fe and Pb for summer. 6. The highest concentrations of most chemical species were found in bumildong and bosudong.

부산지역 규제 대기오염물질에 관한 연구

김창환,정창훈,서정민,박재출,최금찬 동아대학교 환경문제연구소 1998 硏究報告 Vol.21 No.2

In this study, it was carried out to investigate the situation by using monitoring network data for last ten years and regulatory air pollutants data which was sampled and analyed in Pusan. East area was developed as commercial and residental district along the seaside while an representative industrial complex was located in west area. The places in which air sampling were accompanied were divided to two different points : symbolic and worst point. The regulatory air pollutants were sampled seasonally from April to November, 1996 and temperature, humidity, wind speed, wind direction and atmospheric air pressure to obtain weather conditions were also investigated. The time-average pollution index were calculated for each air pollutants to check changing pollution concentration in each hours a day.

체지방량의 차이에 따른 심폐기능비교 : 대구시내 남자고등학생을 대상으로

裵元煥,梁金山 慶北大學校 師範大學 體育學硏究會 1990 體育學會誌 Vol.18 No.-

To study % Fat and cardiorespiratory function of high-school boys in korea and know the relationship between the two, this paper has measured % Fat of 29 high-school boys selected at random by using Body composition analyzer (what is called Body watch) and measured cardiorespiratory function by using E. C. G. test and Gas analyzer which took adventage of treadmill, and made a comparative study on general characterisitics of total group and cardiorespiratory function among three divided group. (1) The school boys were inferior in physique and physical fitness to athletes and students majoring in physical education. However, they were in top condition of all characteristics(Height, weight, % Fat, F. F. W, Vo_2max/kg. H. R_max, V. E, V. T, O_2pulse, because they were in the period of physical development. (2) There were some significant differences in Exchaustion time (P<0.05), R. W(p<0.01), Vo_2max/kg(p<0.05) among three groups divided by the difference of % Fat. However, there were little significant difference in H. Rmax, V. E, V. T, O_2pulse, O_2removal, Respiratory rate, Respiratory Qoutient. (3) V. E was much related to O_2pulse (r=0.94) and V. T(r=0.74) V. T was related to O_2pulse (r=0.72). O_2pulse was related to B. S. A(r=0.83) and weight (r=0.78) B. S. A. was related to weight (0.98) (p<0.01).

원형 Cavity를 이용한 펄스형 Nb:YAG 레이저의 출력특성 및 병렬메쉬 회로의 최적화

홍정환,송금영,양동민,김휘영,김희제 부산대학교 생산기술연구소 2001 生産技術硏究所論文集 Vol.60 No.-

본 연구에서는 기존의 타원형 cavity가 아닌 원형 cavity를 설계 및 제작하여 그 동작특성에 관하여 연구하였다. 그 결과 타원형 cavity 보다 다소 적은 레이저 출력 효율 2.1%를 얻었다. 원형 cavity는 타원형 cavity 보다 컴팩트하며 제작하기가 용이하고, 제작 단가가 저렴하다는 장점이 있다. 입력에너지, 입력전압 및 펄스 폭을 동일하게 했을 경우 주회로 병렬 메쉬회로수를 최적화하고자 한다. PFN 회로를 1단에서 8단까지 PSPICE로 모의시험한 전류파형과 실제 실험한 전류파형이 거의 일치하였다. 그 결과 500㎲이상의 펄스 폭에서 6단 메쉬가 최적의 병렬 메쉬라는 결론을 얻었다. In this study, we have deigned and manufactured not only a present elliptic cavity but also a circular cavity, and experimented the operational characteristics. As a result, we obtained the maximum efficiency of 2.1% that was not less than that of an elliptic cavity. A circular cavity is much more compact and is easier to be manufactured than an elliptic cavity. And it can be made at a low cost. When the input energy, input voltage, and pulse width were in the same condition, we tried to decide the optimization of the mesh number of a parallel-mesh circuit which was connected with main power supply. The PSPICE simulation waveform of PFP(Pulse Forming network) circuit ranging from 1-mesh to 8-mesh nearly corresponded with the real current waveform obtained through a practical experiment. From these experimental results, we obtained the result that 6-mesh was the optimal parallel-mesh circuit in case that the pulse width was more than 500㎲.

Passive Sampler에 의한 질소산화물에 대한 오염지도 작성

김창환,정창훈,조정구,최금찬 동아대학교 환경문제연구소 1998 硏究報告 Vol.21 No.1

NO₂ concentrations were investigated by NO₂ filter badge sampler for the urban area. Passive Sampler can be a useful method to evaluate polluted urban area which was not covered total area. In this study, the difference between filter badge sampling data and monitoring network data was about 15% and R value was 0.918294 by statistic analysis which was resulted a favorable correlation. Distribution of NO₂ concentration in Seoul, Pusan, and Kwangju was showed in figures, and NO₂ concentration in Seoul area was the highest among other cities.

다이아몬드상 카본 박막의 레이저공정 변수에 따른 상변이와 내마모성 특성변화

심경석,차금환,이상렬,김대은 연세대학교 산업기술연구소 1999 논문집 Vol.31 No.2

Diamond-like carbon(DLC) thin films have been fabricated by pulsed laser deposition method with various deposition parameters. The characterization of fabricated thin films was performed depending on the deposition parameters. As the kinetic energy provided by deposition temperature and the laser energy density were increased, the film showed graphite properties. Structural properties of the films were investigated by Raman spectroscopy. The growth energy should be optimized to fabricate high quality DLC thin films. DLC films showed high hardness and their friction coefficients were measured to be about 0.2 regardless of the load of the ball pin.

말티즈견에서 발생한 승모판폐쇄부전 1례

전소분,박혜연,김선아,정금선,이영원,박성준,김덕환,송근호 충남대학교 수의과대학 동물의과학연구소 2004 動物醫科學硏究誌 Vol.12 No.-

A 10 years old, intact male, Maltese dog with clinical signs of labored respiration, exercise intolerance and increasing of coughing was referred to the Veterinary Medical Teaching Hospital of Chungnam National University. Physical examination revealed tachycardia, panting and mild cyanosis. This case was diagnosed as mitral valve insufficiency by clinical signs, ascultation, blood chemistry, radiography and electrocardiography. This dog was treated with ACE inhibitor (enalapril), diuretics (furosemide) and bronchodilator (aminophylline) for 14 days. After treatment, clnical signs were disappeared and also this dog was needed to be continuous monitoring and sodium restricted diet.

급성신부전증 이환견에 대한 복막투석 치료 1례

김건우,이병희,김유수,심재현,김지용,이영원,김덕환,송근호 충남대학교 수의과대학 동물의과학연구소 2004 動物醫科學硏究誌 Vol.12 No.-

A fourteen-month-old intact female Poodle was referred to the Veterinary Teaching Hospital, College of Veterinary Medicine, Chungnam National University. The patient was presented with history of vomiting, inappetence, ataxia, insomnia, tachypnea and convulsion for 5 days. Biochemical examination revealed BUN (254.2 mg/dl), creatinine (9.22 mg/dl) and phosphate (14 mg/dl). Epithelial cells of urinary tract, neutrophils, macrophages, a large number of gram negative and smaller number of gram positive bacteria were presented on urine test. Ultrasonographic findings show hyperechogenic kidney and indistinguishableness of renal cortex and medulla. Based on the results of examination described above, this case was diagnosed as acute renal failure with interstitial nephritis by urinary tract infection (UTI). Treatments with fluids therapy, diuretics, and peritoneal dialysis during hospitalization showed good results with no clinical signs.