Schiff Base에 의한 구리 부식 억제

정병구,이현석,장영학,문채주 木浦大學校 應用科學硏究院 2001 應用科學硏究誌 Vol.1 No.-

The inhibiting action of copper in 5% hydrochloric acid(HCI) solutions with or without Schiff base, 1,2-bis(naphthylideneimine)ethane(NET), 1,3-bis(naphthylideneimine) propane(NPR), 1,4-bis(naphthylideneimine)butane(NBU), and 1,5-bis(naphthylideneimine) pentane(NPE), has been studied by the Tafel method and AC impedance technique. The corrosion parameters were obtained at different inhibitor concentrations and the temperature effect was also investigated. The inhibiting efficiency increases with a decrease in temperature or increase in concentration of the Schiff base. NPE is the best inhibitor in this series and the maximum inhibition efficiency at a concentration of 5×10^-4 M at 298 K approached 90.07%. Schiff base with longer-chain are superior to shorter-chained analogues in inhibition efficiency.

Schift Base에 의한 구리 부식 억제

정병구,이현석,장영학,문채주 국립7개대학공동논문집간행위원회 2001 공업기술연구 Vol.1 No.-

The inhibiting action of copper in 5 % hydrochloric acid(HCl) solutions with or without Schiff base, l,2-bis(naphthylideneimine)ethane(NET), l,3-bis(naphthylideneimine)propane (NPR), l,4-bis(naphthylideneimine)butane(NBU), and l,5-bis(naphthylideneimine)pentane(NPE), has been studied by the Tafel method and AC impedance technique. The corrosion parameters were obtained at different inhibitor concentrations and the temperature effect was also investigated. The inhibiting efficiency increases with a decrease in temperature or increase in concentration of the Schiff base. NPE is the best inhibitor in this series and the maximum inhibition efficiency at a concentration of 5 × 10 exp (-4) M at 298 K approached 90.07%. Schiff base with longer-chain are superior to shorter-chained analogues in inhibition efficiency.

초등학생들의 체격지수가 체력요인에 미치는 영향

채정룡,윤석창,신현철 군산대학교 체육과학연구소 1999 體育科學硏究所 論文集 Vol.1 No.-

The aim of this study make it clear the trait of physical strength according to Physique index and help the Physical fitness leaders to raise the function of exercise and provide them with study programs by stage in the sport learning. For this study 620 students (male & female students in 5 and 6 class of elementary school) were selected. The result of study show outstanding physical trait in body weight ratio and chest girth ratio. The results are the following. (1) The physical characteristics of the investigated children, around 5 class or 6 class, show that female children's growth is faster than male's. (2) The trait of Physical Fitness shows it is superior in male's group and as grow older, but the group of 5 class is more superior than the group of 6 class, in male's and female's pull-ups. (3) The correlation between physique index shows the highest correlation(P< .01) in body weight and girth of chest, next is height and sitting height, height and girth of chest, followed by girth of chest and sitting height. (4) The correlation between 100m sprint and physical fitness shows high positive interrelation(P< .01) in 600m distance run, but negative interrelation(P< .01) in standing broad jump, pull-ups, sit-ups and ball throwing. (5) The correlation between standing broad jump and physical fitness shows positive interrelation(P< .01) in sit-ups, pull-ups and ball throwing, but negative interrelation(P< .01) in 100m sprint and 600m distance run. (6) The correlation between pull-ups and physical fitness shows positive interrelation(P< .01) in sit-ups, standing broad jump and ball throwing, but negative interrelation(P< .01) in100m sprint and 600m distance run. (7) The correlation between sip-ups and physical fitness shows positive interrelation(P< .01) in standing broad jump, sit-ups and ball throwing, but negative interrelation(P< .01) in 100m sprint and 600m distance run. (8) The correlation between ball throwing and physical fitness shows positive interrelation(P< .01) in standing broad jump, pull-ups, sit-ups and ball throwing, but negative interrelation(P< .01) in 100m sprint and 600m distance run. (9) The correlation between 600m distance run and physical fitness shows high positive interrelation (P< .01) in 100m sprint, but negative interrelation (P< .01) in standing broad jump, pull-ups, sit -ups and ball throwing. (10) The correlation between physical fitness and physique index shows the highest correlation in body weight ratio, next is chest girth ratio, followed by sitting height ratio. (11) The correlation between body weight ratio and physical fitness shows positive interrelation (P<.01) in 100m sprint (male and female students in 5 class) and standing broad jump, sip-up (female students in 5 class), ball throwing (male students in 5 class) and 600m distance run, but negative interrelation(P< .01) in pull-ups etc. (12) The correlation between chest girth ratio and physical fitness shows positive interrelation (p<. 01) in 100m sprint and 600m distance run, but negative interrelation(P<. 01) standing broad jump, pull-ups, sit-ups and ball throwing etc. (13) The correlation between sitting height ratio and physical fitness shows positive interrelation (P<. 01) in pull-ups, sit-ups and ball throwing, but negativ interrelation(P< .01) in 100m sprint, standing broad jump, sit-ups and 600m distance run etc. (14) The correlation between physical index shows positive interrational (P< .01) body weight ratio and chest girth ratio, chest girth ratio and sitting height ratio, but negative interrelation in(P< .01) body weight ratio and sitting height ratio.

居金島의 持産植物 資源에 關한 調査硏究

張錫模,鄭丁采,金琮鴻 順天大學校 1983 論文集 Vol.2 No.1

居金島는 東經 127°32′27″∼ 127°05′0″北緯 34°8′52″∼ 34°49′27″에 位置하고 面積은 5.92㎢로서 1982年 七月 30日 부터 1983年 11月 27日까지 12回에 걸쳐 調査한 結果는 다음과 같다. 1. 本島의 所産植物 資源은 總 128科 463屬 644種, 3亞種 76變種 7品種으로 都合 730種이 調査集計 되었고 木本이 290種, 草本이 440種이었다. 2. 本島의 植生은 全般的으로 소나무, 곰솔, 자귀나무, 후박나무, 참나무類, 서어나무等 多樣하고 人間千涉에 依해 破壞되어 回復되지 못하고 있었다. 3. 本島의 植物資源은 用途別로 보면 食用이 271種, 藥用이 346種, 觀常用 168種, 用材樹 43種, 纖維用 14種, 工業粗原料 其他가 113種, 用途不明이 139種이었다. 4. 本島는 暖帶林帶에 屬하여 暖帶의 特徵樹種이 많고 常綠闊葉樹가 74種이나 分布하고 있으며 후박나무 群落地는 保護되고 더욱 撫育되었으면 한다. 5. 本島의 所産 藥用植物의 保護增殖은 물론 常綠性 植物의 觀賞資源 開發 育成에 힘써 島嶼開發과 島嶼植物 保存이 함께 이루워 지기를 바라는 마음 간절하다. An investigation was conducted on the product plant resources of Keokeum Island. The island is situated at 127°32′27″to 127°05′02″east longitude and 34°18′52″ to 34°49′27″ north latitude, and its area is 64.94k㎡ The investigation peroid was from July 30, 1982 to Nov, 27, 1983. The following are the summarized results obtained from the investigation. 1. According to the investigation the total product plant resources of the island were 730 kinds (290 wood arbors, 440 herbs). They were classified as follows, 128 families 463 genuses, 644 species, 3 sub species, 76 varieties, 7 forma. 2. Vegetation was various including Pinus densiflora S, et Z, Pinus trunbergii Parlat, Albizzia Julibrissin Duraz, Machilus Thunbergii S, et Z, Quercus, and Carpinus, etc., but destroyed by human intervention and is not restored yet. 3. The vegetation of the island is classified as follows: 271 species for edible source 346 species for medicinal source, 168 species for ornamental source, 43 species for timber source, 14 species for fiber source and 139 species for unknown use. 4. Since it is situated on the warm temperature forest zone, the island is full of the temperate diagnosis tree with 34 species of evergreen broadleaf trees. It is considered that colony area of Machlus thunbergii S, et Z, should be preserved and brought up. 5. The surveyors strongly hopes that both the development and the plant preservation of the island will be achieved through developing the ornamental resources of the evergreen plants as well as preserving and propagation the medicinal plants of the island.

혼화재 및 폴리프로필렌섬유의 사용에 따른 콘크리트의 품질변화에 대한 기초적 연구

김정섭,손순채,조창호,최진석,김민국 朝鮮大學校 建設技術硏究所 2001 建設技術硏究 Vol.21 No.1

This study is to identify the effect of using admixture and polypropylene fiber on the quality of concrete. The results of the changes in the quality of concrete that has not yet hardened and concrete that has hardened is as follows: 1. Depending on the proportions of admixture, the greater the fly ash content and the lower slag and silica fume, the greater the slump. Admixture and polypropylene together contributed to increased slump. 2. The more fly ash, slag and silica fume added, the less the air. 3. After 360 days of age, greater fly ash content contributed to a lower compressive strength, while greater slag added to higher compressive strength. Silica fume shows a high compressive strength when 10% of silica fume was added on the 360th day of age. 4. Tensile Strength at 360 days of age, the less fly ash and the more slag, the higher the tensile strength. Silica fume at 360 days of age increase strength when the mixing proportion was 30%. 5. The more fly ash and the less slag and silica fume that were mixed, the greater the fire resistance. When added to and polypropylene fiber, the fire resistance of concrete of no effect. 6. The more fly ash and silica fume, the more carbonation shown and when there was only 10% slag present, the neutralization was also shown.

Superconducting MgB2 Wire Drawing Considering Anisotropic Hardening Behavior and Hydrostatic Effect

Young‑Seok Oh,Ho Won Lee,Kook‑Chae Chung,Duck‑Young Hwang,Seong‑Hoon Kang,Jeong Whan Yoon 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.7

Numerical modeling was conducted to investigate the deformation behavior of powder mixture during multi-pass drawingprocesses for multi-filamentary MgB2wire. A modified Drucker-Prager Cap (DPC) model with an elliptical cap surface usingthe new material characterization method was developed to capture the anisotropic hardening behavior and hydrostatic effectof the powder mixture. A number of uniaxial die compaction, cold isostatic pressing, diametrical compression, and uniaxialcompression tests were conducted using different powder densities to characterize the modified DPC model. A commercialfinite element software ABAQUS with a user subroutine was used to simulate the drawing of the MgB2wire. The densityand area fraction of the powder mixture during the wire-drawing process were verified with experimental results. The differencein packing density at the inner and outer filaments of the MgB2wire was successfully captured by simulation. Inaddition, the effect of the initial packing density on the superconducting properties of MgB2wire was numerically studied. It is shown that the increase in the superconducting area, which results from a high initial packing density, should be moreeffective compared to the increase in the grain connectivity in enhancing the critical current properties for the MgB2wirewhen the final packing density is saturated after a number of drawing processes.

CORBA 기반 망관리 시스템 통합에 관한 연구

윤채운,김명균,허정석 울산대학교 1999 공학연구논문집 Vol.30 No.2

통신망이 커지고 복잡해짐에 따라 통신망 관리는 더욱 중요해지고 있다. 이러한 통신망을 효율적으로 관리하기 위해 국제 표준화 그룹인 ITU와 ISO는 CMIS/CMIP 기반의 OSI망 관리 모델 [1]을 표준화하고 IAB에서는 SNMP [7] 기반 망관리 모델을 표준화하였다. 이들 망관리 모델은 통신망 요소들의 관리에는 효율적이지만 복잡한 망들의 관리나 서비스 관리에는 많은 문제들이 있다. 이러한 문제들을 해결하기 위해 본 논문에서는 분산 객체 지향 기술인 CORBA[3]를 이용하여 기존의 망관리 시스템들을 통합하기 위한 방법에 대해 기술한다. CORBA 기반 통합 망관리 구조를 제시하고 CORBA와 OSI망관리 모델사이의 관리정보 및 관리기능 변환 기능을 위한 CORBA/CMIP 게이트웨이 구조를 제시한다. 또한 COBRA 관리자에서 OSI객체들을 접근하기 위� 기법과 OSI객체에서 발생하는 이벤트를 CORBA 관리자에 전달하기 위한 기법들에 대해 기술한다. Network management systems become more important as the communications networks evolve larger and more complicated. For the efficient management of the communications networks, the international standard organizations, ITU and ISO, have standardized OSI network management model [1] based on CMIS/CMIP, and IAB has proposed SNMP [7]as the Internet management model. The traditional management models are efficient in managing simple communications netwrks, but have many problems in managing complicated networks and services. To solve those problems, this paper proposes an integration method of network management systems based on CORBA [3] which is a distributed and object-oriented technology. We describe an integrated network management architecture based on CORBA/CMIP gateway. The CORBA/CMIP gateway converts the management systems. We also describe how the CORBA managers access the OSI managed objects and how the events occurred in the OSI managed objects are delivered to the CORBA managers.

鹽化物 含有梁에 따른 鐵分 腐蝕에 관한 實驗的 硏究

최진석,조철희,신용석,고송균,손순채,김정섭 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)

As a result of separating river sand and sea sand into the corrosion increased according to the of thinnss or the coating and the Chloride Content and Corrosion of Steel Bar through the experiment, the following conclusions are obtained. 1. There was no corrosion in the case of treating the steel bar with anticorrosive among test specimens cured in the air for 60 days, corrosion was found in the test specimens not treated with anticorrosive and for 60 days of age. 2. The area of corrosion increased according to the thinnss of the coating and the chloride content wher exposed for are more than 60 days. Therefore, it was determined in general that the corrosion progressed more rapidly in water cured specimens than in air cured ones and this was due to the influence of C1_(￣) in the sea sand.

충남지역 석불의 암석학적 풍화특성에 관한 연구

최석원,채상정,이효민 공주대학교 문화재보존과학연구소 2003 문화재과학기술 Vol.2 No.1

충청남도내의 중요문화재로 지정된 석불 중 역사적 중요성을 가지고 구조적으로 보아 위험성이 있는 것으로 판단되는 석불 31개를 대상으로 암석학적 특징, 풍화에 의한 암석의 조직 및 광물학적 변화, 풍화에 따른 물성 변화 등, 석불을 이루고 있는 암석의 풍화특성을 파악하였다. 석불을 이루고 있는 암석은 대부분이 중립 내지 조립질의 화강암류이며, 소수 석불만이 편마암으로 이루어져 있다. 시료채취가 가능한 12개 화강암류 석불의 모드분석 결과, 흑운모화강암 8개, 반상화강섬록암 3개, 화강섬록암 1개로 분류되었다. 이것들은 암석자체에 많은 절리, 박리조직과 심한변색을 보이고 있다. 편광현미경하에서의 관찰 결과, 장석류는 견운모화작용이 심하고, 흑운모는 녹니석화작용으로 주변광물을 변색시키며, 석영은 일정한 방향으로 균열이 발생하는 등의 조직변화가 일어나고 있다. 석불을 구성하고 있는 암석은 풍화가 많이 진행되어 카올리나이트화 되었으며. 풍화등급은 MW에서 HW에 속한다. 따라서 대부분의 석불들은 풍화를 많이 받은 상태이고, 각 석불의 풍화특성을 고려하여 과학적이고 비파괴적인 보존방법이 연구되어야 할 것이다. This study was carried out the survey of the petrological weathering characteristics as the petrological texture and the mineralogical alteration and the change of rock physical properties by weathering for 31 Stone-Buddhist images designed as important cultural property in Chungnam province. Most rocks composing Stone-Buddhas are classified into granite which is medium to coarse, but some Stone-Buddhist images comprise in gneiss. As the result of modal composition for 12 Stone-Buddhist images being possible to take samples, they are classified into 8 biotite granite, 3 porphyritic granodiorite and 1 granodiorite, which are showed with many joints, exfoliation and intensive discoloration. Referring to the result of observation under the polarizing microscope, some feldspar are being sericitizated and some biotite are being changed to chlorite Under the observation with SEM, some feldspar are changed into lamella-kaolinite by the weathering. Most rocks composing the stone Buddhist images are being weathered much and kaolinited, and its weathering level is classified into MW to HW referring to the result of these studies. Accordingly it is required studying scientific and undestructive method considering the weathering distinction of Stone-Buddhist images.

운동형태의 차이가 Alloxan유발 당뇨쥐의 혈당 및 인슐린 농도에 미치는 영향

윤진환,정일규,김종오,이희혁,지용석,오봉석,채정룡 대한스포츠의학회 2003 대한스포츠의학회지 Vol.21 No.1

The Purpose of this study was to investigate the effect of exercise intensity on blood glucose and insulin levels in diabetic rats with alloxan. Twenty sprague-dawley male rats were assigned to power training groups(n=10) and endurance training groups(n=10). Diabetes was induced by single injection of alloxan(50 mg/kg B.W) Blood glucose and insulin were determined every week for 4-weeks. The conclusion of this study follows as below: 1) There was significantly different on blood glucose levels in two groups. 2) There was significantly different on insulin levels in two groups These results suggest that proper exercise intensity in diabetic rats can significantly decrease blood glucose and insulin level and make good glycemic control. In conclusion, it has been found that regular prolonged endurance training with diabetic rats, improves insulin and blood glucose.