한국산 부산입술대고둥(Euphaedusa fusaniana)의 아이소자임 변이

황보학,이준상,조등현 江原大學校 附設 環境硏究所 1994 環境硏究 Vol.11 No.-

Electrophoretic variations in isozymes encoded by 16 loci were studied to estimate genetic variation and to assess phyletic relationships, and biogeographic pattern of distribution of the Euphaedusa fusaniana collected from Sehwa, Aeweol, Samchuck, Tongdosa, Gernundo, and Y?su areas in Korea was discussed with respect to the isozyme variation. The 180 apecimens were examined. Means of allele per locus(?) and polymorphism(?) were 1.528 and 45.5%, respectively and hetrozygosity (?_(D)) was 0.205. Samchuck population showed lower mean value of allele per locus(?=1.46). Higher polymorphism(P=57.14%) was observed among Tongdosa popualtion. Aeweol population showed slightly lower genetic variation (H_(D)=0.15) than others. Average genetic similarities(?) among the six populations was 0.716 Aeweol and Samchuck populations were genetically closer(S=0.903) than others. However the S value between Y?su and Samchuch populations was low(S=0.562). Average genetic distance(?) among the 6populations were 0.267. Both Aeweol and Samchuck populations have closer genetic distance (D=0.067). Genetic distance pattern was similar to genetic similarity pattern.

Ti/RuO₂電極에서 요오드化 칼륨 水溶液의 陽極酸化

金學俊 慶南大學校 附設 工業技術硏究所 1985 硏究論文集 Vol.3 No.-

여러 支持電解質중에서 Ti/RuO₂電極에 대한 요오드化鹽 陽極酸化를 cyclic voltammetry, 分極曲線과 마크로電解를 통하여 硏究하였다. 요오드化鹽의 陽極酸化는 I￣→I₂ 그리고 I₂→IO₃￣의 두단계에 의해서 진행되었다. 電解는 弱알카리性 溶液중에서 수행하는 것이 유리하였다. Ti/RuO₂電極은 낮은 分解電壓과 分極效果面에서 PbO₂電極보다 우수한 陽極材料임을 알았다. Ti/RuO₂ electrode was used to investigate the anodic oxidation of iodide in various supporting electrolytes by means of cyclic voltammetry, polarization and macro electrolysis. The anodic oxidation of iodide to iodate proceeded with two steps; the first corresponds to I￣→I₂ and the second to I₂→IO₃￣. Electrolysis took a turn favorable in the weak alkali solution. Comparison with PbO₂electrode showed that Ti/RuO₂ was a very good anode material, with low rest potential and marked polarization effects.

크롬이온의 전기화학적 폐수처리

김학준,윤조희 慶南大學校 附設 工業技術硏究所 1997 硏究論文集 Vol.15 No.1

충전층 복극성 전극반응기는 충전입자간이 단위전극으로 전해가 일어나므로 유효전극면적이 매우 크고 극간거리가 짧아 반응물이 쉽게 전극면에 이동하여 희박용액을 전해하는데 적합하다. 이러한 전해조는 폐수의 전해처리에 응용할 수 있다. 본 연구에서는 충전층전극반응기에 의한 전해방법이 가능한 전해조건과 전극반응기의 특성을 밝히기 위한 목적으로 탄소입자 또는 흑연 펠레트를 충전한 충전층 전극반응기를 이용하여 ?? 수용액을 전해처리하여 충전층 전극반응기의 특성으로 입자 종류, 크기 및 인가전압의 영향에 대하여 검토하였다. ??는 ?? 환원되거나 Cr(OH)₃으로 입자에 석출하였다. 충전입자로 접촉저항이 큰 활성탄을 사용할 필요가 있었다. 활성탄 입자를 충전한 전극반응기로 전해를 보면 보통의 전해조에 비하여 반응속도는 크고 전력효율이 높은 결과가 얻어졌다. 또 인가전류가 클수록 반응속도는 커진다. Packed-bed bipolar electrode reactor is suitable for the electrolysis of dilute soluyions such as certain liquid wastes, because it is composed of numerouse unit-cells situated among packed particles, resulting to increase effective elecrode area, and consequently the reactant can rapidly take part in the reaction. Characteristics of this type of the cell were investigated in the case of the electrolysis of ?? solution under different conditions, with respect to particle material, particle size, and applied voltage. Chromate ion was reduced to ?? or Cr(OH)₃which deposited on packed particles. When the electrolysis was carried out in the cell packed with activted carbon particles, the reation rate and the power efficiency became higher than those in the conventional cell. As applied current increases, the reation rate increased.

용매 분해 전해반응을 포함한 복잡 전극반응계의 반응기 모델링

김학준 慶南大學校 附設 工業技術硏究所 1997 硏究論文集 Vol.15 No.1

회분식 galvanostatic 전해하는 동안 용매 분해를 포함한 전기화학적 연속반응에 대하여 수학적 해석을 하였다. 이를 nitrotoluene의 환원으로 azoxytoluene가 생성되는 연속반응계에 적용하고 potentiostatic 전해한 경우와도 비교하였다. A mathematical analysis of series electrochemical reactions with solvemt decomposition during galvanostatic batch operation is presented. Performance is compared to the equivalent system during potentiostatic operation by using the reduction of nitrotoluene to azoxytoluene as a representative model reaction scheme.

무용과 "예술 작품의 근원"

배학수 慶星大學校 1994 論文集 Vol.15 No.3

Heidegger says in his essay entitled "the Origin of the Work of Art" that art is the creative preservation of truth that happens in the work. Heidegger shows by means of the analysis of a well-known painting by Van Gogh and a Greek temple that truth as disclosure happens in the work of art. Van Gogh's picture of a peasant's shoes presents the world of the peasant. A Greek temple brings to light the characteristic feature of the world of a historical people. The work of art needs not only the creating artist, but also those for whom the work of art is created. On the issue of the encounter between the onlooker and the work of art, Heidegger introduces the notion of preservation. Preserving the work is the experience of the truth that is happening in the work. That is the experience of transforming and transporting out of the familiar world by rupturing the familiar world which is for the most part lived, out questioned with the regard to its worldhood. Dance brings us in a definite mood which offers us a possible world. By presenting this world, the work invites us to enter it. The work of dance opens up a world. We leave the everyday world and live for some time in the possible world presented by the work. In this respect, dance is the creative preservation of the truth that happens in the work.

폐기물 회수 농약병의 전기 화학적 잔류농약 처리

김학준,지해성,이주환 경남대학교 환경문제연구소 1998 환경연구 Vol.21 No.-

By electrochemical oxidation remaining pesticides treatment of recovered pesticide bottle wastes were oxidized and decomposed in a particle packed-bed electrode cell that it was increasing in an anodic reaction area by the proper packing materials. Air flotation oxidation treatment was used to compare organic oxidation by oxygen being generated at the anode with organic oxidation by electrolysis. Obtained the data from the results of batch style particle packed-bed electrode cell were applied to flow style and investigated necessary the some parameters to treat the remaining pesticides wastewater of recovered pesticide bottle wastes. At the removal COD of remaining pesticides wastewater of recovered pesticide bottle wastes PbO₂ was the best anode packing particle and optimum current condition was 3.33A/dm² at the batch style cell. When this condition was applied continuous flow style, the current was 0.69A/dm² at the 30 ml/min flow rate. Also incase of circulation COD was more decreased than not. Removal COD appeared a good tendency, when not only NaCl was added into the wastewater, but also wastewater was a high temperature. At performance comparison of reactor type rectangle type appeared a good tendency and special per-treatment of wastewater was unnecessary. Degradation of TOC was about 70% and COD was obtained about 92% after 85min, when this experiment were carried out electrolysis condition of 0.69A/dm², current density, and 30ml/min, flow rate.

시안이온의 전기화학적 폐수처리

김학준,김미정 경남대학교 환경문제연구소 1996 환경연구 Vol.18 No.-

Packed-bed electrode reactor is suitable for electrolysis of dilute solution such as electroplating wastewater, since each bed is consist of a number of particle electrodes. In this study, the effects of electrolysis time, circulation rate, temperature, cell current, accelerant on the electrolysis reaction are studied using a packed-bed electrode reactor. The cyanide decomposition efficiency is high when the circulation rate is 238 ㎖/min. The effect of the temperature shows that CN decomposition efficiency needs a high temperature for the good electrolysis reaction. The experiments were performed in order to insight the effect of cell current change on cyanide decomposition efficiency. They show that the lower current is prefered to the higher current. The experiments about accelerant show that NaOH(1000mg/ℓ) is more effective than NaOH(1000mg/ℓ). Under the optimum condition. decomposition efficiency of CN ion that is electrolyzed for 60 minutes at the ordinary temperature with NaOH(1000mg/ℓ) accelerant reaches as high as 86%.

물에서의 산소용해기구에 관한 고찰

김학준 경남대학교 환경문제연구소 1994 환경연구 Vol.16 No.-

In the oxygen utilization system of transpiration method of water pollution treatment, author studied the oxygen dissolution mechanishm in order to grope the development and improvement of apparatus. It was found that the dissolution rate take effect by the action of turblent flow and enlagement of surface area in the gas-liquid.

표면 와류 분포 방법을 이용한 아음속 풍동의 2차원 수축부 설계

金學奉 한국항공대학교 1986 論文集 Vol.24 No.-

A design method for the two-dimensional wind Tunnel contractions of finite length have been developed using surface vortex distribution method with given velocity distribution and contraction ratio. The integral eguation for the wall shape is solved by means of numerical and iterative method. Some design examples are presented to compare with other design methods. The results show that the present method may be used to design two-dimensional contracting duct with good exit velocity uniformity and with desired wall pressure gradient, duct length and contraction ratio.

입자 충전층 전극 반응기를 이용한 유기물 폐수처리

김학준,이주환 경남대학교 환경문제연구소 1997 환경연구 Vol.20 No.-

고농도의 유기물함유 폐수를 처리하기 위하여 적당한 충전물을 양극에 충전하여 반응표면적을 증가시킨 입자 충전층 전극반응기를 이용하여 산화 분해하였다. 회분식 입자 충전층 전극 반응기와 연속식 입자 충전층 전극반응기를 이용하여, 고농도 유기물함유 폐수를 처리하기 위해 필요한 여러 전해조건들을 검토하였다. 유기물의 폐수처리에서 양극 충전물로는 PbO₂가 가장 좋았고, 최적 전류는 회분식에서 2.22/dm²이었다. 이 조건을 연속식에 적용했을 때, 60㎖/min의 유속에서 전류는 0.62A/dm²이었고, 높은 온도일수록 좋은 경향을 나타냈다. 1F의 전기량을 흘렸을 때 거의 100%의 COD제거가 얻어졌다. The organic waste water treatment of high concentration was oxidized and decomposed in a particle pack-bed electrode cell that it was increasing in an anodic reaction area by the proper packing materials. Obtained the data from the result of batch style particle pack-bed electrode cell were applied to flow style cell and investigated necessary the some parameters to treat the organic waste water. At the removal COD of organic waste water PbO₂ was the best anode packing particle, optimum current condition was 2.22/dm² at the batch style. When these conditions were applied at the flow cell, the current at the 60ml/min flow rate was 0.62A/dm². Removal COD at the high temperature appeared a good tendency. Removal COD was obtained almost 100%, when 1F passed through this system.