珪酸마그네슘의 合成條件에 關한 硏究

전우정,신화우,최광식,안세민,이광표,장영수 원광대학교 식품약품안전성연구소 1993 食品藥品安全性硏究 Vol.6 No.-

Magesium twisilicate is mainly uaed as a nonsytemic antacid andabsrbent. Magnesium trisilicate when teeated with anacid sxuh as diluted hydrochloric acid in gastric juice decomposes to form Magnesium chloride and colloidal Silicates. 2MgO·3SiO_2 + 4Hcl - 2MgCl_2 + H_4Si_3O_8 (or 3SiO_2 + 2H_2O) Colloidal mixture The resultng colloidal silicates can protect ahe ulcer frdm further acid and peptic attack and possibly adsorb the pepsin. It is well known that yield of Magnesium trisilcate produced is greatly affected by the Synthesis condition such as the reactant concentration, reaction temperature and moleatio of reactant solutions as well as by the emperature at which the precipitate is dried and the temperature of washing water, etc. The purpose of this study is to investigate the optimum synthesis conditions of Magnesium trisilicate. A randomized complete block design suggested by G.E.P. Bdx and K.B. Wagnesium sulfate solution with Sodium silicate solution in this study. It was found that optimal synthesis conditidns were: Reaction temperature range : 57-90 ℃. Concentration range of reactants (Sodium silicate and Magnesium sulfate) : 19.1-29% molar ratio of the reactants. [Sodium silicate]/[Magnesium sulfate]: 1.47-1.80. temperature range of washing water: 45-48℃ and drying temperature range: 65-82℃ The antacidic activity of five Magnesium trisilicate samples which shows the maximum antacidic efficacy was tested by pharmacopeia acid consuming capacity test. The five Magnesium trisilicate samples were samples were identified by chemical analysis.

傾斜地에서의 步測의 精度에 관한 硏究

전우정 안성산업대학교 1979 論文集 Vol.11 No.-

本 硏究의 結果를 要約하면 다음과 같다. 1. 30˚의 傾斜地에서 登測의 경우 步長은 平地 步長의 1/2로 減少된다. 2. 傾斜地에서 步測은 步數에 平地步長 및 <Table-2> 3項의 係數를 곱하면 된다. 3. 登測時 步長은 降測時 步長의 約 75%에 該當한다. 4. 步測의 精度는 平地에서 約 1/190, 30˚에서 約 1/100이 된다. 5. 可能하면 登測보다 降測을 擇함이 良好한 精度를 얻을 수 있다. This experiment was performed in pacing up hill and pacing down hill to carry out the pacing experiment at incline land after establishing seven distriets:0 (level ), 5°, 10°, 15°, 20°, 25°, 30°, more incliner, more decreaser in step-length. Also the occasion of pacing up hill, in some degree of incline, dacrease more than that of pacing down hill. The results of experment are as follws. 1. The accasional of pacing up hill of incline in 30 decrease than level and by 1/2 2. The horizontal distance in some district of incline come to that comstant which is gained here times constant of the article 3 in table 2 and average step-length 3. The step-length in pacing up hill equal to 75% of that in pacing down hill 4. The accuracy of pacing in level landis roughly 1/190 and 1/100 in 30°. 5. The selection of pacing down hill is profitable than pacing up hill in possible

混和劑 添加量에 따른 콘크리트의 物理的性質 變化 比較 試驗

全禹亭 안성산업대학교 1982 論文集 Vol.14 No.-

Admixtures are used to modify the properties of concrete, such as to improve workability, increase strength, retard or accelerate strength development, and increase frost resistance. In order to improved the qualities of concreate, altered the water-cement ratio to 6.5%. 60%, 55% in general concrete. Selected each one of the typical agent among the four kinds of admixtures and additives. Sample is as follows; (1) Fly-ash, (2) Vinsol resim, (3) Calcium chlorid, (4) Pozzolith No.5. Additional quantity of admixtures were changed four steps, and measured the value of slump testing at 15, 30, 60, 120 minute each, and the value of absorption ratio at 1, 5 24 hrs each. In this study, concreste specimens were in accordance with the Korean Standards Specification for concrete. In the tests, for compressive strength, bond strength of specimens were measured at following age. Test of age ; 1-day , 3-days, 7-days, 28-days, 90-days. The results of obtained from the experimental analyses are summarized as follow; 1. It is possible to get the concrete of strength the same as concreter of using admixtures in general concrete in an occasion carring out thoroughly, but general concrete is inperior absolutely compare with the concrete of using admixtures, in workablility and absorption. 2. Fly-ash is very useful and economical material any other admixtures, to improve of workablility and strength, absorption, but early-strength is lower than the any others. So, can use to unnecessary structures of early-strength. Moderate tolerance of replacement quantity is 10-20 percent in the weight of cement per unit.

混和劑 添加量에 따른 콘크리트의 物理的性質 變化 比較 試驗〔Ⅱ〕

全禹亭 안성산업대학교 1983 論文集 Vol.15 No.-

1. Vinsol-resim is useful materials to improve workability and absorption, durability. Should be careful in the choice of admixtures and to determinate of additional quantity. Moderate tolerance of additional qeeantity is 0.005~0.01 percent of the weight of cement per unit. 2. Calcium chloride added in proper amounts it provides increased early strength during cold weather and also provides better protection against damage due to freezing temperature, by shortening the time that the concrete require protection. Bond strength is very high, but it must be necessary to inspected and cared that used to reinforce concretement, because doesn‘t study about corrosion of reinforcing steel. Moderate tolerance of additional quantity is 1-2 percent at the weight of cement per unit. 3. Pozzolith No.5 is one of the most excellent admixtures. Bond strength is lower than the other admixtures a little, but it is very economical admixtures in improving workability and strength, durability, absorption. Moderate tolerance of additional quantity is 0.1-0.5 percent at the weight of cement per unit.

傾斜地에서의 視距水潗測量의 精度에 관한 硏究

全禹亭 건국대학교 1979 論文集 Vol.10 No.1

It is wide-known that the precision of the stadia leveling is more or less lower than that of the direct leveling. In this study, the two kinds of measurements are dealt to prove their differences. They are taken in a rough and steep land. In the measurements, the precision for a instrument installment and for the 1 kilometer's distance and the necessary time are as follows: 1.The precisions for a instrument installment are as follows: a) 1 mm in the direct leveling in which the Y.L. is used. b) 5 mm in the above leveling in which the T.L. is used. c) 11 mm in S.L1 used in the stadia leveling. d) 25 mm in S.L2 used in the stadia leveling. e) 4.1 mm in S.L3 used in the stadia leveling. As a result, the shorter the distance of sight, the higher the precision is. 2.The precisions in the measurement of the 1 kilometer's distance are as follows: a) 4 mm in the direct leveling in which the Y.L. is used. b) 28 mm in the direct leveling in which the T.L. is used. c) 55 mm in S.L1 used in the stadia leveling. d) 81 mm in S.L2 used in the stadia leveling. e) 177 mm in S.L3 used in the stadia leveling. Therefore, the precision shows the sable features as the above-mentioned No. 1 3.The necessary tinges according to the instruments and the distance of sight are as follows: a) 35 min. in the direct leveling in which the A.L. is used. b) 42 min. in the direct leveling in which the Y.L. is used. c) 43 min. in the direct leveling in which the T.L. is used d) 20 min. in S.L1 used in the stadia leveling e) 17 min. in S.L2 used in the stadia leveling. f) 15 min. in S.L3 used in the stadia leveling. As the above differences show, the stadia leveling saves more time. 4.By means of the stadia leveling, we can obtain the average precision even in the steep land as in the even land. The longer the distance of sight the bigger the observational error grows. But there is no difference in the necessary time between them.

旣存 콘크리트에 묻어넣은 異形鐵筋의 附着强度 比較實驗에 關한 硏究

全禹亭 안성산업대학교 1981 論文集 Vol.13 No.-

This study was carried out to investigate the adhesive effect between fresh concret and harden concrete in the cases or repair, supplement and constructural jointing works. In order to check the bond strength, mortar and epoxy resin were filled in the hole of harden concrete with reinforced bar and pull out test of the bar from the hole was exermined. And obtained results were as in the followings. 1. Anchorage length in normal concrete required more than 10cm and age of 28 days maximum bond strength marked about 47.6㎏/㎝^2. It was enough to get the bond strength of 47.6㎏/㎝^2. at 7 days of age, when epoxy resin was used as a filles. 2. At any anchorage length of ages of concrete, epoxy resin was superior to normal concret as filler. 3. The 1 : 2 mortar was inferior to the epoxy resin, but is was also superior to the 1 : 3 mortar and normal concret at any conditions, as a filler. 4. When 1 : 3 mortar was used as a filler anchorage length of 15㎝ was required. 5. In order to joint fresh concrete to harden concrete, if the epoxy resin or mortar were filled in the hole of the harden concrete, a reasonable adhesive effect would be seen. 6. An additiond concrete of F.C. SHO-Bond in creased more bond strength at 80 percentage in nearly than the normal concret.

배선용 전선의 다양한 재결정 과정의 내부 조직변화에 대한 연구

전우정,문병선,조영진,박종진,오재근,박우식 한국법과학회 2004 한국법과학회지 Vol.5 No.4

콘크리트 壓縮强度의 早期判定에 관한 硏究

全禹亭 안성산업대학교 1984 論文集 Vol.16 No.-

This study was early dicision of compresive strength in concrete, the test are differently effect varying to curing method. The result obtained are summarized as follows. 1. This testing be of opinion somparative high strength, economical and practical. 2. Each a promotion strength have obtainabled the 28 days strength (σ28) (1) A cylinder specimen of concrete(Φ 10×20cm) σ28 = 71+1.79σ_B - (1) σ28 = 65+1.42σ_W - (2) σ28 = 85+1.28σ_3 - (3) σ28 = 58+1.03σ_7 - (4) (2) A regular hexahedron specimen of mortar(5×5×5cm) σ28 = 108+1.43σ_B - (5) σ28 = 82+1.39σ_W - (6) σ28 = 165+0.94σ_3 - (7) σ28 = 111+0.86σ_7 - (8)

자동차 바퀴의 기계적 마찰에 의한 발화 연구

전우정,박종진,오재근,문병선,조영진,박남규,박종택,박우식 한국법과학회 2006 한국법과학회지 Vol.7 No.1

통합링크기능을 가진 매체접근제어기용 프레임 분배방식의 성능분석

전우정,윤정호 한국통신학회 2000 韓國通信學會論文誌 Vol.25 No.7

본 논문은 LAN의 대역폭을 증가 시키기 위하여, 여러 개의 링크를 논리적인 하나의 링크처럼 동작하도록 하는 다중링크통함(link aggregation)기술에 대한 것이다. 우리는 망 구성에 따라 이 기술의 동작방식이 상이함에 착안하여, 두 가지의 새로운 프레임 분배방식을 제안하고 SIMULA를 이용한 모의실험으로 성능을 분석하였다. 먼저, LAN스위치와 스위치간에 적용 가능한 동적 프로엠 분배방식을 제안하였다. 이 방식은 특정 포트로 집중되는 프레임들을 분산시키기 위하여 가장 이용율이 낮은 링크를 동적으로 추가하는 것으로서, 링크 추가시 프레임들의 전달순서를 지킬 수 있도록 특별한 플러쉬 버퍼를 사용하였다. 모의실험 결과, 프러임간의 순서가 유지되면서도 스위치의 내부 버퍼에서의 프레임 폐기율이 기존 방식에 비해 감소됨을 확인하였다. 그리고, 단말과 단말간에 다중링크가 사용된 경우, 수신된 프레임들 간의 순서 뒤바뀜 문제에 대한 해결책으로 패딩 방법과, 태깅 방법, 프레임 분할 방식 등의 세가지으 프레임 분배방식을 제안하고 성능을 분석하였다. 이러한 세가지 방법 중에서 프레임 분할방식이 가장 성능면에서 우수함이 모의실험결과\ulcorner서 알 수 있지만, 패딘 방식도 구현관점에서 장점이 있다.