韓國河川의 流出率과 流出指標로서의 洪水直前 流量

金熙鍾,柳又秀,金佳鉉,申東守,韓健模,全裕燦 東亞大學校 大學院 1984 大學院論文集 Vol.9 No.-

This paper is a study on relation between run-off ratio and antecedent discharge, run-off ratio and antecedent discharge per unit area, antecedent discharge and antecedent precipitation, by the data from the five major river basins in Korea and the small river basins in Pusan. The Nak-Dong rivers(An-Dong upper stream) f=0.4780+0.0124 ln qA r=0.99 qA=0.3368e0.1101R r=0.99 f=0.5793+0.0146 ln(qA/A) r=0.99 The Nak-Dong rivers except Ga-song station f=0.2017-0.0840 ln qA r=0.75 f=0.7012+0.0750 ln(aA/A) r=0.71 The Han rivers f=-0.0035+01267 on qA r=0.75 f=1.1311+0.1263 ln(qA/A) r=0.71 L=302.9064-43.8490 ln qA r=0.84 The Geun rivers(Mu-sin Cheon) f=0.295+0.1823 ln qA r=0.93 f=0.8417+0.1823 ln(qA/A) r=0.93 L=40.0456+62.0346 ln qA r=0.94 The Yeong-san rivers f=0.3766+0.0598 ln qA r=0.79 f=0.8084+0.0599 ln(qA/A) r=0.79 The Seom-jin rivers f=-1.3875+0.6505 ln qA r=0.92 f=2.1633+0.3465 ln(qA/A) r=0.76 Small river basin in Pusan f=0.3635+0.1120 ln qA r=0.87

Tetrachloro-o-cresol의 製法에 關하여

呂壽東,姜淙熙 慶北工業專文大學 1966 論文集 Vol.3 No.-

Aromatic halogen derivatives have been shown a great deal of interest by various investigators as intermediates for other compounds, as insectcides, fungicides and dyeing properties. We also supposed that the chlorodeivatives of o-cresol would exhibits properties of fungicides, insecticides and dyeing. We introduced chlorine into o-cresol in the presence of a carrier, I2, at the temperature of 60 to 140℃ for 144 hours and obtained 142g alkali-soluble Compound and other polymer soluble in benzene. 1. We supposed that alkali-soluble compound which is main product would be tetrachloro-o-cresol through quantitative analysis, molecular weight and other properties. 2. A by-droduct solube in benzene is supposed to be an addition and more complicated polymer formed by intermolecular condensation between-CH2CI and-OH. 3. In this reaction, although a compound of monochloro and dichloro-cresol can be formed normally and easily, tri and tetrachloro-cresol is slow in reacation because of steric hindrance.

십자돌기형 페라이트 전자흡수체의 광대역 설계

김동일,박종구,원영수 韓國海洋大學校電波通信硏究所 1999 電波通信硏究所論文集 Vol.1 No.-

전자공학 및 전파 통신기술의 눈부신 발전은 우리의 생활을 풍요롭게 해주는 반면, 전파의 사용증가로 인한 EMC대책이 사회적으로 중요하게 부각되고 있다. EMI/EMC 측정을 위한 전파무향실이 국제기준을 만족하려면 이를 구성하는 전파흡수가 30 ㎒ - 1 ㎓까지의 주파수 대역에서 20 ㏈ 이상의 전파흡수능을 가져야 한다. 그러나, 1998년 11월 CISPR11은 주파수대역을 30 ㎒ - 18 ㎓까지 확장하였다. 본 논문에서는 위의 조건을 만족하는 십자돌기형 및 테이퍼진 십자돌기형 전파흡수체를 제안하고 등가재료정수법으로 광대역 설계하였다. 나아가서, 그 결과를 FEM 및 FDTD법의 결과와 비교하였다. The remarkable progress of electronics and radio communications technology has made our life abundant. On the other hand, the countermeasure of EMC becomes more important socially according to the increased use of electromagnetic waves. It had been required that the absorbing ability of an electromagnetic wave absorber is more than 20 ㏈, the bandwidth of which is required through 30 ㎒ to 1,000 ㎒ for satisfying the international standard about an anechoic chamber for EMI/EMS measurement. From November of 1998, however, the CISPR11 has accepted the extended frequency band from 30 ㎒ to 18 ㎓ in the bandwidth of EMI measurement. In this paper, we proposed the cross-shaped type and tapered cross-shaped type absorbers satisfying the above requirments and carried out broadband design using the equivalent material constants method. Futheremore, the results have been compared with FEM and FDTD.

韓國河川의 流砂量算定에 관한 硏究 : 洛東江을 中心으로

金熙鍾,姜周復,申東守 동아대학교 공과대학 부설 한국자원개발연구소 1981 硏究報告 Vol.5 No.2

本 論文은 洛東江의 流砂量算定을 위해서 掃流力과 浮遊砂量, 掃流砂量을 實測하여 考察한 것이다. 1. 河川에서 實測한 限界掃流力을 다음 式으로 表示할 수 있다. dm>0.085㎝ : U_(*c)^(2)=Γc/ρ=105.78dm-2.25(㎠/sec^(2)) dm 0.085㎝ : U_(*c)^(2)=Γc/ρ=113.94dm+1.60(㎠/sec^(2)) 2. 實驗室에서 얻어진 限界掃流力式은 다음과 같다. U_(*c)^(2)=34.83dm^(0.788)(㎠/sec^(2)) 3. 浮遊砂量의 算定公式은 다음과 같다. Qs=0.002Q^(1.726) Qs : ㎏/sec Q : ㎥/sec 4. 總流砂量의 算定公式은 다음과 같다. Q_(T)=2.797×10^(-6)Q^(1.44) Q_(T) : ㎥/sec Q : ㎥/sec This paper is studied a consideration on the practical measure of the critical tractive force, suspended load and bed load of NAG-DONG river for the calculation of sediment load. 1. The critical tractive force measured in the river can be represented as a following formula. dm>0.085㎝ : U_(*c)²=Γc/ρ=105.78dm-2.25(㎠/sec²) dm 0.085㎝ : U_(*c)²=Γc/ρ=113.94dm+1.60(㎠/sec²) 2. The formula of the critical tractive force obtained in the laboratory is as follows U_(*c)²=34.83dm^(0.788)(㎠/sec²) 3. The calculation formula of suspended load is as follow Qs=0.002Q^(1.726) Qs : ㎏/sec Q : ㎥/sec 4. The calculation formula of the sedimentation is as follow Q_(T)=2.797×10^(-6)Q^(1.44) Q_(T) : ㎥/sec Q : ㎥/sec

미세한 α_2-Ti_3Al상이 석출된 Ti-6Al-4V 합금의 동적 변형거동

이동근,이성학,이종수 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.1

In this study, Widmansta¨tten and equiaxed microstructures containing very fine α_2 particles were obtained by overaging a Ti-6Al-4V alloy, and their dynamic deformation behavior was investigated. Dynamic torsional thests were conducted by using a torsional Kolsky bar, and deformed microstructures and torsionally deformed areas beneath fracture surfaces were observed to investigate various factors affecting dynamic deformation properties of α, β and their interfaces. The dynamic torsional test results indicated that maximum shear stress and fracture shear strain of the over-aged Winmansta¨tten and equiaxed microstructures were higher than those of the unaged microstructures. The possibility of the adiabatic shear band formation under dynamic loading was quantitatively analyzed, based on the observation how plastic deformation energy was distributed to void initiation and adiabatic shear banding. Since the number of voids formed in the over-aged microstructures drastically increased because of the α_2 precipitation, driving force for the adiabatic shear band formation decreased as much as deformation energy used for the void formation, thereby reducing the possibility of the adiabatic shear band formation. These findings provided a new idea how to improve ballistic performance of Ti alloy armor plates because the over-aging of the Ti-6Al-4V alloy was effective on both the improvement of tensile and dynamic torsional properties and the reduction in the possibility of the crack initiation due to adiabatic shear banding.

구강외과 외래 환자의 통계학적 분석

변종수,곽동호 慶北大學校 齒科大學 1987 慶北齒大論文集 Vol.4 No.1

This is a staticstical analysis of outpatients in our dept. from 1986.1.1. to 1986. 12. 31. We analyzed the patients by the sex,age, disease,causes of fracture of facial bones. Particularly, we obtained the rate of the patient of the medical insurance. The results were as follows; 1. The sex ratio was 5.7:4.3 (M:F) 2. Among the total 3,239 cases of the patients, the smiple extraction was 25.41%, surgical extraction was 14.28%, inflammatory disease was 6.73%. cyst was 2.22%, fracture of the facial lone was 1.20% and tumor was 0.96%. 3. The august showed the highest visit ratio in the years. 4. Medical insurance was 65.99%, general patient 2.00%, and industrial accident insurance was 0.65%. 5. The major etiologic factor of the facial bone fracture was fights (38.5%), industrial accident(3%) in orders.

전신성 색전증으로 발현된 감염성 심내막염 3례

김지수,박대균,박경창,홍경순,두영철,한규록,오동진,유규형,임종윤,고영박,이광학,이영 대한순환기학회 1999 Korean Circulation Journal Vol.29 No.8

NIH-전립선염증상점수표 한국어 번역판의 타당도와 만성전립선염에서의 특징

정창호,류동수,오태희 大韓泌尿器科學會 2001 Korean Journal of Urology Vol.42 No.5

Widmanstatten 조직을 가지는 Ti-6Al-4V 합금의 준정적 및 동적 변형거동에 미치는 미세조직인자의 영향

李東根,李聖鶴,李鍾洙,許善茂 대한금속재료학회 2001 대한금속·재료학회지 Vol.39 No.12

This study is concerned with the effects of microstructural parameters on the quasi-static tensile and dynamic torsional deformation behaviors in Ti-6Al-4V alloys with Widmansta¨tten structures. Dynamic torsional tests were conducted using a torsional Kolsky bar for five Widmansta¨tten structures, which effective grain sizes such as colony size and α lamellar spacing were varied by heat-treatments, and then the test data were analyzed in relation to microstructures, tensile properties, and fracture mode. Under dynamic torsional loading, maximum shear stress showed a large dependence on the colony size as the effective grain size, while shear strain at the maximum shear stress point was largely affected by both the α lamellar spacing and the colony size. Adiabatic shear bands were found in the deformed region of the fractured specimens, and their width was smallest in the specimen having the large α lamellar spacing and colony size. The possibility of the adiabatic shear band formation was quantitatively analyzed by the theoretical critical shear strain (γ_c) condition. It was found to be most likely in the coarse Widmanstatten structure, whereas least likely in the fine Widmanstatten structure.

Modified Halterman Appliance를 이용한 제 1대구치 이소맹출의 치험례

손동수,김종철,김영재 大韓小兒齒科學會 1997 大韓小兒齒科學會誌 Vol.24 No.4

Ectopic eruption is defined as abnormal eruption and results in malpositioned teeth and abnormal root resorption of adjacent teeth. Ectopic eruption, first reported by Chapman, occurs in 3% of the population and that mostly in the maxilla. Etiologic factors include narrow maxilla, large maxillary teeth, retarded calcification of the first molar, inclined eruption path of the first molar and retruded position of the maxilla. Impaction of the second molar is rare and occurs mostly in the mandible. Major causes are large teeth and insufficient arch length. Halterman has devised a method of distalizing a ectopically erupting first molar by cementing a band on the second deciduous molar with a hook soldered and a button bonded to the occlusal surface of the first permanent molar. Ectopically erupted posterior teeth should be treated early to maintain normal development of the dentition, harmony of facial growth and occlusal support, a failure to do so could result in severe malocclusion, periodontal damage and continued root resorption of the adjacent teeth. Early detection and treatment is thus vital. The author is submitting this report as he has obtained favorable results in treating a patient who came to the SNUDH Dept. of Pediatric Dentistry complaining of the first molar by using a modified Halterman appliance.