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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.
체험 요소(4Es)가 체험즐거움, 만족도, 재방문에 미치는 영향: Pine과 Gilmore의 체험경제이론(Experience Economy)을 중심으로
박수경,박지혜,차태훈 한국방송광고공사 2007 광고연구 Vol.0 No.76
본 연구에서는 Pine과 Gilmore(1998)의 체험경제이론에 근거하여, 매장 내 체험을 4가지 측면으로 분류하고, 각각 의 체험이 소비자에게 즐거움을 주는지 확인해보고, 더 나아가 체험의 즐거움이 구매만족과 재구매의도 및 추천의 도에까지 영향을 미치는지 살펴보고자 하였다. Build a Bear Workshop 앞에서 판단표본추출법(purposive sampling)을 통하여 인형을 직접 제작하거나 액세서리를 구매한 고객만을 대상으로 하여, 130개의 질문지가 수집되었다. 경로분석 결과 엔터테인먼트와 현실도피적 체험 요소는 즐거움에 영향을 미치지 않았으나, 교육적 체험 요소와 미적 체험 요소는 즐거움에 긍정적 영향을 주었으며, 체험의 즐거움은 체험만족도, 재방문/구매의도, 추천의도에 영향을 주는 것으로 나타났다. The purpose of this study is to examine the effects of 4Es on experience enjoyment, satisfaction, and revisit intention, following Pine & Gilmore(1998). 130 questionnaires were collected in front of‘ Build a Bear Workshop’where the subjects participated in the teddy bear making process. The results of path analysis show that educational and aesthetic experience has a positive influence on the enjoyment. The expereicne enjoyment has an effect on the satisfaction and revisit intention. The theoretical and practical implications are provided.
흉통의 양상에 따라 분류한 불안정형 협심증 환자의 임상적 소견의 비교
김명수,김성구,정호석,온영근,신원용,김철현,최태명,현민수,권영주 순천향의학연구소 2001 Journal of Soonchunhyang Medical Science Vol.7 No.1
Background and aims : The clinical syndrome unstable angina pectoris that encompasses a variety of symptoms and clincal presentations of transient episode of myocardial ischemia, was devided to several subgroups. Also, it has variable pathophysiologic factors to cause myocardial ischemia. According to clincal presentation, coronary angiographic finding and prognostic factor, the result of unstable angina pectoris is variable. In fact, there were a few data reported on the prognosis of wide spectrum of patients with unstable angina. However, the precise risk of subgroups according to classitication has not been established because it was difficult to compare between studies. We classified unstable angina pectoris by clinical nature of chest pain, and performed to establish and compare the clinical presentations, coronary angiographic findings, treatement and prognosis of patients with unstable angina within subgroups of classification. Methods : Retrospenctive data for 164 unstable angina pectoris patients admitted to the Internal Cardiology Division of Soon Chun Hyang University Hospital from May 1996 to July 1999 was analyzed. The patients were classified into one of the following categories: Class I, new onset of severe angina; Class II, acceleration of previous chronic stable angina; Class III, angina at rest. Clinical presentations, echocardiographic findings, coronary angiographic findings, treatment and prognosis were compared. Results : From the total 164 patients, the subjects of classes were as follows : Class I, 46 cases (28.1%); Class II, 74 cases (45.1%); Class III, 44 cases (26.8%). In view of age distribution, the 7th decade had the highest incidence, and then, 6th, 8th decades were followed. There was no baseline differences among the 3 classes with respect to gender, number of risk factors. Significantly, class II showed more severe findings in abnormal Q wave 15 cases (20.8%), total occclusive lesion 10 cases (20.8%) and three vessel coronary disease 11 cases (22.9%) than other classes. The change of ST segment was significantly apparent (p<0.02) among class I 28 cases (60.8%), class III 26 cases (59.0%), comparing with class II 30 cases (40.5%). Class III had the higher incidence of one vessel coronary artery disease than class I and III. The heparin treatment was performed in 99 cases (60.1%). The incidence of nonfatal myocardial infarction was much more in class I and III, each 4 cases (8.7%, 9.8%) than in class II 1 cases (1.4%). In-Hospital death was occurred in class I and II, each 1 case. Conclusion : The patients with the acclerated angina from chronic stable angina had more severe coronary artery disease than other classes, but they had better in-hospital prognosis.
수종의 엔진 구동형 니켈-타이타늄 합금파일의 절삭각에 따른 근관성형 효과에 관한 전자현미경적 연구
전인수,금기연,박성호,윤태철 大韓齒科保存學會 2002 Restorative Dentistry & Endodontics Vol.27 No.6
The purpose of this in vitro study was to compare the effects of root canal debridement following rotary Ni-Ti instruments with positive versus negative rake angle. Seventy sound, extracted human anterior teeth & premolars were randomly divided into four groups. The used rotary instruments were Ni-Ti HERO642(Micro-Mega in France, 20 specimens), Ni-Ti ProFile(Maillefer, Ballaigues, Switzerland, 20 specimen), stainless steel engine reamer(Mani, Matutani Seisakusho Co.,Japan, 20 specimen) and negative control group(10 specimens) was only extirpated with barbed broach(Mani, Matsutani Seisakusho Co., Japan) Group 1 & 2 teeth were prepared to a #40 at the apex followed by 1 mm using crown-down technique. Group 3 teeth were instrumented from a #15 to a #40 in sequential order. After preparation and final irrigation, the roots split longitudinally into a bucco-lingual direction. Root halves were cross-sectioned in apical third portion again. all root specimens were prepared for SEM investigation & photographed. Separate evaluations were undertaken for smear layer on prepared walls with a five score-index for each using reference photograph in root halves. the penetration depth of smear layer into dentinal tubules was also estimated in the other halves. the following results were obtained : 1. Smear layer was observed on all the prepared walls with three experimental groups except negative control group 2. Smear layer characteristics1) HERO 642 groups showed snowy & dusty appearance & were observed only few some dentinal tubuli open on the prepared walls, and the penetration depth of it into dential tubules may be 1-2 ㎛ thick. 2) ProFile groups showed shiny & burnished appearance & complete root canal wall covered by a homogenous smear layer with no open dentinal tubuli and penetration depth of it into dentinal tubules may be 1-2㎛ thick. 3) Engine reamer groups showed obviously file's passed tracks on the prepared walls & were observed complete root canal wall covered by a homogenous smear layer with no open dintinal tubuli. The results revealed that a completely clean root canal could not be achieved regardless of positive & negative rake angle, which is in accordance with the majority of studies on root canal cleanliness In conclusion, throughout irrigation with antibacterial solutions or chelating agents is recommended to remove the smear layer on prepared canal walls.
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.
조태순,이선미,김낙두,허인회,안형수,권광일,박석기,심상호,신대희,박대규 충남대학교 약학대학 의약품개발연구소 1999 藥學論文集 Vol.15 No.-
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^-6M) 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.
液體膜에 의한 Cyclohexane과 n-Heptane 混合物의 分離에 있어서 界面活性劑가 미치는 影響
崔洙鉉,鄭泰秀 成均館大學校 科學技術硏究所 1994 論文集 Vol.45 No.2
In the separation of cyclohexane-n-heptane mixture by liquid membrane in a batch system, the effects of surfactants on the separation factor were investigated with the surfactant concentration ranging from 0.2 to 1.0wt%. The surfactants used were sodium lauryl sulfate, sodium laurylether sulfate and triethanolamine lauryl sulfate. The separation was most effective at the surfactant concentration of 0.4wt% and at the emulsification speed of 1200 rpm for all three surfactants. The separation was also most effective at the contact time of 20 mimutes for sodiurn lauryl sulfate and 15 minutes for sodium laurylether sulfate at the settling time of 10 minutes, while it was so for triethanolamine lauryl sulfate at the contact time of 20 minutes and the settling time of 15 minutes.
박수연,하성호,김재현,박태현 성균관대학교 생명과학자원연구소 1994 生命資源科學硏究 Vol.1 No.2
Posterior silk glands of Bombyx mori were cultured for the in vitro production of silk fibroin. Four-day-old fifth-instar larvae and Grace's media with or without silkworm hemolymph were used for experiments. With the addition of silkworm hemolymph, significant increase in the secretion of fibroin from the lumen to the outside of the gland was observed and total amount of fibroin increased by 14%. Most of the fibroin produced in the media was insoluble protein. Total amount of fibroin reached a plateau in 24 day culture without the addition of silkworm hemolymph, whereas it increased continuously in the medium supplemented with silkworm hemolymph.
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 phamacological properties of New Wonbang Woohwangchungsimwon Pill (NSCH), effects of Wonbang Woohwangchungsimwon Pill (SCH) and NSCH were compared using various experimental models. In rat aorta, NSCH and SCH made the relaxation of blood vessels in maximum contractile response to phenylephrine (10^-6 M) regardless to endothelium containing or denuded rings of the rat aorta. Furthermore, the presence of the inhibitors of NO synthase and guanylate cyclase did not aftect significantly the relaxing effects of NSCH and SCH, NSCH and SCH inhibited the vascular contractions induced by acetylcholine, prostaglandin endoperoxide or peroxide in a dose-dependent manner. In conscious spontaneously hypertensive rats (SHRs). NSCH and SCH decreased significantly heart rate. These, 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 guinea-pig papillary muscle, these had no effects on parameters of action potential such as action potential amplitude (APA). V_max and resting membrane potential (RMP) at low doses, whereas inhibited the cardiac contractility at high doses. Furthermore, these had a significant inhibitory effects on palpitation of the heart in normotensive rats and SHRs. These results suggest that NSCH and SCH have weak cardiovascular effects, and that there is no significant differences between cardiovascular effects of two preparations.