장치 및 미디어 관리를 통한 네트워크 기방 백업 및 복구

복경수,강태호,윤종현,유재수 충북대학교 컴퓨터정보통신 연구소 2005 컴퓨터정보통신연구 Vol.13 No.1

저장 매체의 대용량화가 가속화되면서 대용량의 데이터를 효과적으로 백업하기 위한 요구가 증가되고 있다. 본 논문에서는 네트워크 장치 및 미디어 관리를 통해 네트워크 기반 백업 및 복구를 지원하는 백업 소프트웨어를 설계하고 구현한다. 제안하는 백업 소프트웨어는 디스크 기반 백업을 지원하기 위해 NDMP 프로토콜을 확장한다. 제안하는 백업 소프트웨어는 전체 또는 부분 백업, 수동 또는 자동백업 기능을 제공한다. 또한, 사용자에 의해 요청되는 부가적인 작업을 처리하기 위해 pre/post 스크립트 기능을 제공한다. 제안하는 백업 소프트웨어는 백업 장치 및 미디어를 효과적으로 관리하고 이를 풀(pool)이라는 논리적인 단위로 관리하는 장치 및 미디어 관리 기능을 제공한다. As the size of storage media is growing, the efficient backup for the huge capacity data are required. In this paper, we design and implement the backup software that supports network based backup and restore with management of network devices and media. The proposed backup software extends NDMP protocol for the disk to disk backup. In addition, the proposed backup software has various features such as partial or full backup, immediate or automatic backup, and so on. It supports pre/post script to process additional actions for users. It also provides devices and medium management features that efficiently manages a large number of backup devices and media, and groups devices and media management functions that are managed by logical units called pools.

마늘 및 2,3-Dimercaptosuccinic acid의 投與가 姙娠白鼠의 카드뮴中毒에 미치는 影響에 關한 硏究

宋泰卜,裵恩相,廉容泰 고려대학교 의과대학 1987 고려대 의대 잡지 Vol.24 No.1

Recently the garlic has been proved to have some protective effect on the heavy metal poisoning of cadmium and mercury in several studies. From this fact it may be assumed that the garlic would have a protective effect to the toxicity of heavy metals in pregnant rat also. Therefore this study was designed to confirm the effect of garlic on the toxicity of cadmium in the pregnant rat and its fetus. The result of it was compared with that of 2,3-dimercaptosuccinic acid (DMSA). The experimental groups were devided into 3 groups; cadmium-alone treated group, cadmium-garlic combined treated group, cadmium-DMSA combined treated group. Each group was composed of 3 sub-groups according to the dosage of cadmium injection. The total of 4㎎/kg, 8㎎/kg and 16㎎/kg of cadmium was injected subcutaneously at the back of pregnant rat in each subgroup for 4 days, from the 14th to the 17th day of gestational period. Garlic and DMSA were administered per os from the day before cadmium injection to the 21st gestational day. The results of this study were as follows: 1. The inhibition of fetal growth due to cadmium administration into pregnant rat was prohibited in cadmium-garlic or cadmium-DMSA combined treated group except for the 16㎎/kg cadmium injected subgroups. 2. The accumulation of cadmium in tissues of liver, kidney and blood of pregnant rat, placenta and fetus was increased according to the increase amount of cadmium injection in all 3 experimental groups. Garlic and DMSA decreased the cadmium levels of maternal liver, kidney and blood, but there was no significant difference of cadmium level between garlic and DMSA treated group. 3. Garlic decreased the accumulation of cadmium in tissues of placenta and fetus, but it was not significant statistically comparing with that of DMSA or no-treatment group. Correlations of cadmium levels among maternal blood, placenta and fetus were positively high. 4. Necrosis of proximal convoluted tubules with pyknosis of epithelial cells was observed extensively in fetal kidney of cadmium-alone treated rat. However, the necrosis of the tubules was found only in small numbers of the tubules in cadmium-garlic combined treated one, but there was no remarkable change in cadmium-DMSA combined treated rat comparing with cadmium-alone treated one. As a conclusion this study revealed that the garlic would reduce the accumulation of cadmium in maternal tissues and protect against the toxic effect of cadmium at fetus in context of the growth inhibition and histopathological damage of kidney, but would not attribute the interfering the transportation of cadmium through placental barrier.

아연전해스라임으로부터 이산화망간의 회수 및 정제

吳岱燮,李萬浩,金昌福 慶北大學校 1985 論文集 Vol.39 No.-

Manganese slimes from zinc refinery electrolytic cell contain 59.94% MnO_2. The recovery process of MnO_2 from the slimes consists essentially of five steps, i.e., roasting of the slimes, dissolution of the manganese, removal of iron, electrolytic synthesis on MnO_2 from MnSO_4 solution, and preparation of finished MnO_2. Also we report here the optimum conditions of the recovery process of MnO_2 from mangaanese slimes. The crystal structure of MnO_2 product is γ-type.

MathCAD를 사용한 X-선 회절상의 계산

조태경,송인명,권영준,이희복 공주대학교 사범대학 과학교육연구소 1994 과학교육연구 Vol.25 No.1

물질의 결정구조를 연구하는 데에는 일반적으로 X-선 회절상의 분석방법을 가장 많이 사용한다. 따라서 대학교육과정에서 고체물리학, 결정학, 재료과학 등 여러 분야에서 X-선 분광법에 대하여 공부한다. 그러나 실제 강의에서 X-선 회절의 이론을 X-선 회절상의 분석 방법과 직접 대응시켜 설명하기란 쉽지 않다. 본 논문은 MathCAD란는 software을 써서 X-선 회절 이론식으로 부터 간단하게 원하는 결정의 X-선 회절상을 계산하는 방법을 제시하고, X-선 결정구조 분석에 관한 학습과 연구에 활용할 수 있는 자료가 되도록 하였다. The most available technique for the study of the crystal structure is the analysis of X-ray diffraction patterns. For this reason lectures on X-ray diffractions have been given at universities in various subjects such as solid state physics, crystallography, material science, etc. However, it is not easy to teach the theory of X-ray diffraction in conjunction with the analysis X-ray diffraction patterns. In this study, we have used MathCAD software to calculate angles, intensities, and patterns of the X-ray diffraction of crystal using formula given in the theory without any complication. The program has shown in the study will be useful for research on crystallography as well as for teaching the subject.

PCS/IMT-2000 중계기용 광대역 평면형 안테나

조태복,노재원,이택경 한국항공대학교 2000 論文集 Vol.38 No.-

하나의 안테나를 이용하여 PCS와 IMT-2000 시스템의 중계기 안테나를 통합하여 사용함으로써 설치비용을 줄이고 시스템의 운용과 유지보수가 용이하다. 본 논문에서는 PCS와 IMT-2000에서 동시에 사용이 가능한 중계기 안테나를 설계 및 제작하였다. 또한 편파 다이버시티를 위한 두 편파 안테나를 설계하였다. PCS와 IMT-2000을 겸용하려면 안테나의 대역폭이 매우 넓어야 하므로, 광대역 특성을 얻을 수 있는 개구면 결합 급전 방식을 사용하였다. 이중 편파 안테나 구현을 위해 개구면 결합 급전과 마이크로스트림 선로를 통한 급전을 각각 사용하여 서로 간의 간섭을 최소화하였다. 시뮬레이션과 제작된 안테나의 측정 결과를 통해 대역폭, 복사패턴, 편파 등의 특성이 PCS/IMT-2000 중계기 안테나에서 요구되는 특성을 만족하였다. A PCS/IMT-2000 combined antenna fur repeater can be installed in limited space with reduced maintenance cost. In this paper, the antenna for the PCS/IMT-2000 combined repeater is designed by employing aperture-coupled feeding. For the polarization diversity, the dual-polarized antenna is designed. For dual-polarized operation, one of the signals is fed directly to the patch via microstrip line and the other is fed through the aperture. The simulated and measured data satisfy the required characteristics of the PCS/IMT-2000 combined antenna in terms of bandwidth, radiation pattern, polarization, and isolation between feeds

캐릭터 지다인을 위한 다변량분석의 적용방안

정광태,송복희 한국기술교육대학교 2006 論文集 Vol.13 No.1

Character is one of the most important high value-added industries in 21 century. Various analyses on character are required to raise customer's satisfaction on character products. In this study, we proposed application method of factor analysis, cluster analysis, multi-dimensional scaling and application cases. From the factor analysis, aesthetic factors on character could be decided and image maps with aesthetic factors could be obtained. From the cluster analysis, characters could be grouped by its aesthetic characteristics. From the multi-dimensional scaling, a direction of character design could be decided. Finally, it is concluded that multi-variate analysis should be effectively applied to character design.

개별처방식수업(IPI)모형을 적용한 웹기반 학습 및 평가시스템의 설계 및 구현 : Focusing on computer study at middle school

하태현,이복자 한국컴퓨터교육학회 2004 컴퓨터교육학회 논문지 Vol.7 No.1

본 연구에서 제안하는 시스템은 기존의 웹기반에서의 문제운행 시스템원리인 학습내용전개→문제제공→평가결과를 제시하는 수준에서 탈피한 IPI(Individually Prescribed Instruction: 개별처방식 수업)를 적용한 개별완전학습을 목표로 설계 구현한 것이다. 개별완전학습을 하기 위하여 먼저 선수학습의 진단평가가 이루어지며 이에 따라 학생들 각자에 맞는 학습을 하게 된다. 또한 학생들마다 수업 목표에 도달하는 시간이 다르기 때문에 하나의 단원을 완전학습하기 전에는 다음 단원으로 학습이 진행될 수 없다. 따라서 학습의 성취도를 측정하기위해 각 단원의 학습 뒤에 평가가 이루어지며 평가결과 80%이상의 성취수준을 보이면 다음 단원의 학습으로 계속 진행이 이루어지고, 80%미만의 성취수준을 보이면 다음단원으로의 진행이 제한되고 개인별 보충학습이 이루어진다. 여기서 보충학습은 학습자가 완전히 학습하지 못한 학습에 대한 수준별 처방 학습이다. 따라서 본 연구는 개별처방식 수업의 완전학습에 그 목표를 두고 선수학습 결손을 방지하고 개인적 능력에 따라 피드백 학습을 하여 완전학습 목표에 도달할 수 있도록 시스템을 설계 및 구현하였다. This study aims to design and implement individual complete learning system based on IPI(Individually Prescribed Instruction) model. Most of current web based learning systems do not consider individual students’ ability and just follow the sequence of instructing contents → providing problems → presenting the result of evaluating. However, this system focuses on individual ability prior to studying subjects. In individual complete learning system, it is acknowledged that a period and a pace to complete each task will differ from students to students, therefore until they complete the whole unit, they are not allowed to move onto the next unit. After completing each unit, there will be a process of evaluating students’ performance. It is necessary to show the correct completion of 80% of the evaluation to move onto next step; for those who are evaluated as inadequate to move on, an individual supplementary instruction will be provided. Therefore, this study intends to supplement the deficit of prior learning and provide feedback dependent on individual’s learning ability so that the goal of Individual Whole Complete Learning could be accomplished.

만성적 소음폭로가 근로자의 혈압에 미치는 영향

김복연,김천태,이중정,박홍진,김창윤,강복수 大韓産業醫學會 1996 대한직업환경의학회지 Vol.8 No.1

The question of an association between occupational noise exposure and blood pressure has important public health implications. The harmful effects of hypertension are well known and noise is considered the most pervasive problem of all occupational exposures in Taegu City, Korea. A cross-sectional study on the effect of long-term noise exposure on blood pressure was done for 276 noise exposed workers(203 male workers, 73 female workers). Long-term noise exposure was measured by cumulative noise exposure level and noise-induced hearing loss. Hearing loss = 500Hz+2×1,000Hz+2×2,000Hz+4,000Hz -------------------------------------- 6 Questionnaire was administered to the workers, which includes age, sex, occupational history on the noise exposure, habits on alcohol drinking and smoking, practice of regular exercises, family history of hypertension. Type A behavior, question on stress, height, weight and blood pressure were measured. Serum triglyceride and low density lipoprotein(LDL) were also measured. Audiometry was done in the closed booth at 1,000, 2,000, 3,000, 4,000, 6,000, 8,000, 1,000 and 500Hz in order. Multiple logistic regression analysis revealed that cumulative noise exposure level(p〈0.05), serum triglyceride(p〈0.01), age(p〈0.01) and family history of hypertension(p〈0.05) predict hypertension (systolic blood pressure : 160㎜Hg or above, or diastolic blood pressure : 95㎜Hg or above) in male workers. In female workers, serum triglyceride(p〈0.01), LDL(p〈0.01) and family history of hypertension(p〈0.05) were predictors of hypertension (systolic blood pressure : 160㎜Hg or above, or diastolic blood pressure : 95㎜Hg or above). As the number of female workers with hypertension was too small, the multiple logistic regression was done according to hypertension criteria of systolic blood pressure greater than or equal to 140㎜Hg, or diastolic blood pressure greater than or equal to 90㎜Hg. Based on this criteria, cumulative noise exposure level(p=0.055) and age(p=0.057) predict hypertension. It is suggested that long-term noise exposure which was calculated by cumulative noise exposure level was a significant predictor of hypertension in noise exposed workers.

體力章實施에 따른 諸問題点 硏究

金泰運,趙福德 부산대학교 사범대학 1978 교사교육연구 Vol.5 No.2

The purpose of this study was to identify a great deal of problems on test of physical ability be being used as marks of entrance examination in high school. Subjects were total 1075 third year boys and girls students attending in middle school which are located in Seoul, Busan, Taegu respectively. Questionaires made out by researcher of this study, was used to obtain many informations about results of physical ability training. The results of this study were summarized as follows: 1) Percentiles of rank classified by mark of physical ability test were as follows: special rank 44%, first rank 31.3%, second rank 19.6%, third rank 4.4%, fourth rank 0.7%. 2) Students who thought that obtained rank was in proportion to amount of training were 60.7%. 3) 54.3% students wanted to practice physical ability training not by repetition of physical ability battery but by game activities. 4) Students who took part in physical ability training positively amounted to 49.2%. 5) Owing to hard training of physical ability battery, 14.3% boy students lost their interest in physical education and 24.1% girl students did.

스퍼터된 바나듐 산화막의 구조적, 광학적 특성에 미치는 기판 온도의 효과

이규대,최복길 公州大學校工科大學生産技術硏究所 1998 論文集 Vol.6 No.-

Thin films of vanadium pentoxide(V₂O5) have been deposited by r.f. magnetron sputtering from V₂O5 target in gas mixture of argon and oxygen. Crystal structure, surface morphology, surface composition and optical properties of films prepared under different substrates are characterized through XRD, SEM, AES, XPS and optical absorption measurements. The films prepared below 100℃ are amorphous, and those prepared above 200℃ are polycrystalline. Thermally Induced oxidation of films into higher oxide has been observed with increasing substrate temperature. Vanadium oxide films show two optical absorption bands indicating the presence of direct and indirect transitions.