OS Security Enhancement System by Considering Security Level

Tai-Hoon Kim,Gil-cheol Park,Seok-soo Kim 보안공학연구지원센터 2007 International Journal of Multimedia and Ubiquitous Vol.2 No.3

Trusted operating systems (OS) provide the basic security mechanisms and services that allow a computer system to protect, distinguish, and separate classified data. Trusted operating systems have been developed since the early 1980s and began to receive National Security Agency (NSA) evaluation in 1984. The researches about trusted OS are proceeding over the world, and new product type using the loadable security kernel module (LSKM) or dynamic link library (DLL) is being developed. Most important concept in this paper is Security Level proposed by Dr. Tai-hoon Kim, because this concept should be considered in every operational environment. This paper assumed security level 1st proposed by Dr. Taihoon Kim, and proposes a special type of product using LSKM and specific conditions for operational environment should be.

POS System Design in Security Level 1st

Seok-soo Kim,Tai-hoon Kim 보안공학연구지원센터 2007 International Journal of Multimedia and Ubiquitous Vol.2 No.2

POS system is a supply net administration system for customer management. It becomes an essential element in distribution industry to construct database, and uses XML-Encryption to complement PKI techniques and standards for security. POS system has four advantages. First, it does not have to be certificated and transmit data every time because there is no server. Second, it can integrate database by using XML and improve portability of program itself. Third, transmitted data is safe because of XML-Encryption. Fourth, processing speed will be faster because it gathers data from data transmission. All systems should be designed by considering security level to reduce non-necessary burdens. The concept of security level management was developed by Dr. Tai-hoon Kim a few months ago, and this paper used this idea. In this paper, Security Level 1st environment was considered to design POS systems.

Impeller의 類型이 高粘度 液體의 混合에 미치는 影響

鄭泰秀,尹雲榮 成均館大學校 1982 論文集 Vol.32 No.-

Effectiveness of six types of rotating agitator in the batch mixing of high viscous liquid was studied in a vessel of 125mm diameter by measuring power input, mixing time and energy which is the product of power input and mixng time. The mixing time was measured by electrical conductivity of sodium chloride solution which was added as a tracer. The six types of agitators used were a four-blade paddle, a four-layer two-blade paddle, a six-blade turbine, a helical screw, a helical ribbon and an anchor agitator. The results are as follows: 1. For a helical ribbon, an anchor and a helical screw agitator, the mixing time was inversely proportional to stirrer speed and decreased in the order of a helical ribbon, an anchor and a helical screw agitator in the most range of rotational speed. 2. The power consumed for all agitators was proportional to the rotational speed and increased in the order of a helical ribbon, an anchor and a helical screw agitator in the most range of stirrer speed. 3. The anchor agitator consumed the least energy for stirrer speed in the range of 30-7-rpm, and beyond 70rpm the helical ribbon agitator consumed less energy than the anchor and helical screw agitators. 4. The two types of paddle agitators and the turbine agitator have been found not good enough to be used in the mixing of high viscous liquid in comparison with the other three impellers mentioned above.

드릴링 작업의 적응제어에 관한 연구

이수한,박성태 울산대학교 1984 연구논문집 Vol.15 No.2

기존의 드릴링 기계를 적응제어공작기계로 변환하였다. 절삭속도를 제어변수로 선택하였는데, 수학적 모형에 의한 드릴작업의 해석으로 그 타당성을 밝혔다. 변환된 드릴링 기계로 실험한 결과 공절삭시간 및 실절삭시간이 상당히 줄어 생산성이 향상되었고 기계를 안전하게 사용할 수 있었다. The adaptive control system has been developed with conventional drilling machine. The cutting velocity is selected as controlling variable by the result of the analysis of the mathematical model of drilling process. The machining tests shows that the adaptive control system developed is very efficient in reducing air cutting time and metal cutting time, and is reliable in several operating conditions.

정신과 병동에서의 억제대 시행에 관한 고찰

이정태,최수호 大韓神經精神醫學會 1982 신경정신의학 Vol.21 No.2

This study deals with some aspects of psychiatric use of physical restraints. A total of 476 patients were admitted to the department of neuropsychiatry of Yoido St. Mary's Hospital, Catholic Medical College from Aug. 1, 1980 to July 31, 1981. Among these patients 73 cases were physically restrained during this period and all included in this study. The results were as follows; 1. 35 patients were males and 38, females. More than one half of the restrained patients were in their twenties (37.0%) and thirties (23.3%). 2. Diagnostically schizophrenia was most frequent (53.5%), and the next was organic brain syndrome (12.4%), and alcoholism (11.0%) in that order. 3. The frequencies of physical restraints per patient ranged from 1 to 9 (total 151 times), and 33 patients were restrained only once. 4. Physical restraint was required on the first day of admission in 21.9% of all cases, but in 39.7% of total number of uses, it was required after 7 days. Most restraints were able to be removed within 24hours. 5. Common impulsive ward behaviors of the physically restrained patients were disruption of therapeutic environment (40 times), assaultive to staffs or patients (35 times) and verbally abusive and combative with staffs (33 times). The most common cause for physical restraints was that for the administration of medical care to non-cooperative patients (70 cases, 46.3%). Violent behaviors requiring a physical restraint were more common in nonschizophrenics than schizophrenics.

신원방우황청심원액의 심혈관계에 관한 약효

조태순,이선미,김낙두,허인회,안형수,권광일,박석기,심상호,신대희,박대규 성균관대학교 약학연구소 1999 成均藥硏論文集 Vol.11 No.-

Abstract-In order to investigate the pharmacological properties of New Wonbang Woohwangchungsimwon Liquid (NSCL), effects of Wonbang Woohwangchungsimwon Liquid (SCL) and NSCL were compared. In isolated rat aorta, NSCL and SCL showed the relaxation of blood vessels in maximum contractile response to phenylephrine (10^-6 M) regardless to intact endothelium or denuded rings of the rat aorta. Furthermore, the presences of the inhibitor of NO synthase and guanylate cyclase did not affect the relaxing effect of NSCL and SCL. NSCL and SCL inhibited the vascular contractions induced by acetylcholine, prostaglandin endoperoxide or peroxide in a dose-dependent manner. In conscious spontaneously hypertensive rats (SHRs), NSCL and SCL significantly decreased heart rate. NSCL and SCL, at high doses, had a negative inotropic effect that was a decrease of left ventricular developed pressure and (-dp/dt)/(+dp/dt) in the isolated perfused rat hearts, and also decreased the contractile force and heart rate in the isolated rat right atria. In excised guinea-pig papillary muscle, NSCL and SCL had no effects on parameters of action potential such as resting membrane potential, action potential amplitude, APD_90 and V_max at low doses, whereas inhibited the cardiac contractility at high doses. These results suggested that NSCL and SCL have weak cardiovascular effects with relaxation of blood vessels and decrease of heart rate, and that this effect is no significant differences between cardiovascular effects of two preparations.

151종 생약제 추출물이 B형 간염 바이러스 표면 항원(HBsAg)과 항체(HBsAb)의 결합반응 그리고 HBV DNA polymerase 활성에 미치는 효과 : 한국산 각종 생약제를 이용한 B형 간염치료제의 개발

정태호,김정철,김문규,이인선,채성철,김승래,정준모,이인수,김승호,함경수 慶北大學校 醫科大學 1992 慶北醫大誌 Vol.33 No.3

세계인구 43억명 중 B형 간염 바이러스 보균자는 2억 1천 5백만명이며 이중 78%인 1억 6천만명 이상이 아시아 대륙에 집중되어 있다. 한국도 B형 바이러스 간염의 침윤지대이다. 본 연구는 B형 바이러스 보균자 혹은 만성간염을 치료할 수 있는 생약제를 탐색할 목적의 일환으로 한국에서 시판하는 생약제 151종을 구입하여 증류수로 추출하고 여과한 후 냉동건조하여 HBs 항원에 대한 결합능, HBV DNA polymerase억제능, tumor necrosis factor(TNF) 유리에 미치는 영향, 그리고 galactosamine 유발 간염에 대한간장보호 작용을 조사하였다. 151종의 생약제중 0.16㎍/㎖ 농도에서 간염 vaccine 내에 함유된 HBs 항원과 결합하는 생약제는 지유, 가자, 복분자, 대황, 정향, 빈량, 산수유, 소목, 마황, 쇄양, 후박, 목과, 양강, 오약, 산사, 목단피 등 16종이었다. 이들 생약제중 대황(Rheum palmatum L. 大黃), 가자(Terminalia chebula R. 訶子), 지유(Sanguisorba officinalis L. 地楡), 복분자(Rubus coreanus M. 覆盆子)는 HBV DNA polymerase 활성도를 비교적 강하게 억제하였으며 빈량(Areca catechu L. 빈랑), 정향(Eugenia caryophyllata T. 丁香), 목과(Chaenomeles japonica L. 木瓜), 산수유(Cornus officinalis S. 山茱萸)는 약하게나마 HBV DNA polymerase 활성을 억제하였다. 또한 HBV DNA polymerase를 억제한 대황, 가자, 지유, 복분자, 빈량, 정향, 마황, 소목, 산수유를 대상으로 TNF 유리에 미치는 영향을 조사한 결과 소목을 제외한 8종의 생약제 모두가 대식세포를 자극하여 TNF를 유리시켰다. 그리고 장차 임상에 사용함을 전제로 HBV DNA polymerase를 억제한 대황, 가자, 지유, 복분자, 빈량, 정향, 마황, 소목, 산수유를 galactosamine 유발 간염(백서)에 투여하여 간기능 검사에 미치는 효과를 조사하였으나 간기능 검사상으로는 특별한 보호작용을 나타내지 못하였으며 생약제 단독 투여로서는 간기능에 대하여 나쁜 영향을 주지 않았다. Hepatitis B virus infection is major cause of acute and chrome hepatitis, cirrhosis of liver, and hepatocellular carcinoma. There are over 200 million carriers of hepatitis B virus in the world, nearly 80 % of whom live in the South East Asia, Korea is also highly endemic area of hepatitis B virus infection. This study was performed to evaluate the effect of extracts of traditional Korean herbal medicines on hepatitis B virus. 151 traditional herbs were extracted, filtered and lyophilized. Using 151 herbal extracts we tested binding capability to the HBs Ag, inhibition of HBV DNA polymerase, release of tumor necrosis factor (TNF), and protection against galactosamine induced liver damage. Among 151 herbs, 16 herbs (Sanguisorba officinalis L., Terminalia chebula R., rubus coreanus M., Rheum palmatum L., Eugenia caryophyllata T., Areca catechu L., Cornus officinalis S., Caesalpinia sappan L, Ephedra sinica S., Cynomorium songaricum R., Machilus thunbergii S., Chaenomeles japonica L., Alpinia officinarum H., Lindera strychnifolia V., Crataegus pinnatifida B., Paeonia suffruticasa A. ) had binding capability to HBs Ag which contained in the commercial hepatitis vaccine, at 16 ug/㎖ of concentratioa Among the above 16 herbs, Rheum palmatum L., Terminalia chebula R., Sanguisorba officinalis L., Rubus coreanus M. significantly inhibited the HBV DNA polymerase activity, and Areca catechu L., Eugenia caryophyllata T., Ephedra sinica S., Caesalpinia sappan L., Chaenomeles Japonica L., Cornus officinalis S. also inibited the HBV DNA polymerase activity but less effective. All of the herbs, except Caesalpinia sappan L., which inhibited the HBV DNA polymerase activity, actively stimulated the mononuclear cells to release tumor necrosis factor(TNF) in whole blood culture system. The herbs which inhibited the HBV DNA polymerase activity, did not show any protective effect in galactosamine-induced hepatitis in rats, but there was no direct toxic effect when herbs were administered alone.

cis-Dichlorodiammineplatinum (Ⅱ)이 Hamster 신장의 Acid Phosphatase 활성에 미치는 영향

백태경,정수태,이규식 한양대학교 의과대학 1987 한양의대 학술지 Vol.7 No.2

cis-Dichlorodiammineplatium (II) (cis-DDP), a metallic compound, is a bifunctional alkylating agent that has been known as an effective anticancer drug. It is so effective on solid tumor that it has been used in the therapy of ovarian tumor, epithelial tumor of the neck, bladder cancer and thyroid cancer. Since cis-DDP reacts with DNA and RNA especially with guanine base, the protein synthesis is inhibited consequently. As a result, administration of cis-DDP results in cytotoxicity of the renal epithelial cell. So te author undertook the present study to pursue the effect of cis-DDP on the activity of acid phosphatase of the hamster kidney. Hamsters, weighing 110gm, were used as experimental animals. The experimental animals were killed at 2, 4, and 6 days after administration of 6 mg/kg of cis-DDP. The specimens obtained from the kidney were sectioned at 16㎛ thickness with frozen cytostat. The acid phosphatase activity was observed by the Gomori's method for the histochemical study. The results were as follows. 1. The acid phospatase activity was moderate positive at the cortical glomeruli and weak positive at the outer stripes of the medulla in the 2 day cis-DDP treated group. 2. The acid phosphatase activity was moderate positive at the pars concoluta glomeruli of the cortex and other strips of the medulla while a weak positive activity was seen at the inner stripes of the medulla in the 4 day cis-DDP treated group. 3. The acid phosphatase activity was moderate at the parts convoluta and renal medulla, and strong positive activity was seen at the glomeruli in the 6 day cis-DDP treated group. It is suggested that cis-DDP decreases the acid phosphatase activities of the hamster kidney.

치근단 병소에서 면역적격세포의 분포에 관한 연구

윤태철,박동수,김진 大韓齒科保存學會 1992 Restorative Dentistry & Endodontics Vol.17 No.1

Periapical lesions are developed as a result of inflammatory response to irritants from root canal system. Clinicians remove these irritants from root canal system and seal the root canal space to induce healing of the periapical lesions. Immunopathologic responses may play an impostant role in development ans progression of periapical lesions ans periapical lesions contain immunocompetent cells. The purposes of the present study were to analys and to compare the distrebution of the immunocompetent cells in the human periapical lesions caaording to the stage of endodontic treatment using indrect immunoperoxdase technique. Obtained 94 human periapical lesions were devided into four groups : Group 1 : no endodontic treatment(28 samples) Group 2 : root canal enlarged and irrigated(28 samples) Group 3 : root canal filied(29 samples) Group 4 : unknown(9 samples) Monoclonal antibodies to examine target cells were UCHL-1 for T lymphocytes(1:200, Dakopatt, Denmark), L26 for B lymphocytes(1:200, Dakopatt, Denmark), OPD4 for heper T lymphocytes(1:200, Dakopatt, Denmark) and alpha-1-antichymotrypsin for macrophages (1:200, Dakopatt, Denmark). The following results were obtained : 1.All the periapical lesions studied were infiltrated by T lymphocytes, plasma cell, B lymphocytes, and macrophages, T lymphocytes were more infiltrated than B lymphocytes, and B lymphocytes and macrophages were less infiltrated than T lymphocytes and plasma cell(P<0.05 : Oneway ANOVA test). 2. In untreated group and canal irrigated and enlarged group of all the periapical lesions, helper T lymphocytes were predominently infiltrated(P>0.05 : Oneway ANOVA test). 3. In canal filled groups of all lesions except periapical cyst, plasma cells were predominently infiltrated. But, in canal filled group of periapical cyst, helper T lymphocytes were the predominent cells(P>0.05 : Oneway ANOVA test). The above results shows that the immunologic responses play important role in pathogensis of periapical lesions and the immunologic response involved undergoes certain changes after endodontic therapy.

탄소성지반에서 굴착단계별 토류벽의 거동해석에 관한 연구

김수일,김경태 연세대학교 산업기술연구소 1992 논문집 Vol.24 No.2

A computer program to predict the sequential behavior of earth retaining structures during excavation in elastoplastic soil is developed in this study. Validity of the computer program developed is tested by comparing the computer outputs with field measurement data at an excavation site. Through the validity test, it is found that lateral displacements computed are close to measured data when the Terzaghi method is used to obtain the modulus of lateral subgrade reaction and soil pressures computed using elasto-plastic model concept match well with measured soil pressure distribution.