용해분산법에 의해 제조된 microcapsule의 방출 성능에 미치는 영향에 관한 연구

차시환,김용욱 慶熙大學校 材料科學技術硏究所 1992 材料科學技術硏究論集 Vol.5 No.-

Biodegradation of cruid oil at sea surface is limited with nutrients(N,P) concentration. Theoretically, cruid oil can be cleaned up by various skimming devices, but conditions seldem allow to succeed, our studies on the limiting factors of cruid oil biodegradation in natural seawater is responsetothe addition of nutrient(N,P). Nutrient, Consist of the ratio of 10 part ammonium chloride and 1 part of potassium phosphate, were encapsuled with waxes of n-paraffin and bees wax as the wall material. the improved way of preparation of microcapsules by hat methanol for high speed mixing with impeller could decrease the rate of nutrient release from the microcapsules and enhance the maximum amount of nutrient release. We confirm that enhancement of biodegradation by the addition of improved microcapsules. The materials used in the work as well as method of preparation of the spherical microcapsule(melting spray congealing method). For this purpose, the first objective is to obtain some sample(microcapsule) able to deliver the nutrient with a constant or a controlled rate. As a result, the release of nutrient salt in seawater shows interesting kinetics of release : the rate of nutrient salt delivery increases with a positive acceleration when an improved model of the microcapsule(I.M.C) is preparation.

우리나라 鍾乳窟의 特性과 環境汚染에 關한 硏究

洪始煥,朴冕用 건국대학교 1979 學術誌 Vol.23 No.2

This paper reviews the general status of stalactite caves which were found and are utilized for sight-seeing in Korea, and also summarizes the results of investigations on properties of natural stalactite caves. The cavernous phenomena such as the water quality, atmospheric phenomena, secondary grown products, ecological adaptation, environmental pollution and the breakage of stalactite are compared between those of cave a which are opened already sight-seeing and unresults are discussed and also compared with the caves in other countries. Environmental pollutions in Korean stalactite caves are as the following : The animate matters in caves are disappeared gradually from the time of exposure for sight-seeing. The kinds and abundance of the animate matters favoring the cavernous life or coming from the outside of caves have relativity to temperature, moisture and atmospheric conditions in caves. The water quality is consistent throughout the entire flow passage in a cave, but calcium content were less with the increase of flowing water volume in a cave. Atmospheric phenomena at entrance of a cave show a slight difference from the inner atmosphere, and the moisture content in cavernous atmosphere are increased with the cave depth. The secondary growth of stalactite are not taken place at the entry, because of low moesture content in air. However, stalactite secondary growth were prominent at inner cave where the moisture content is more than 90%. The temperature variation in the caves are negligible through all seasones in a year. The following conditions are critical to conserve the cavernous environmental pollution and the original form of caves. Some caves should not be exposed to the sight-seeing for academic studies. If the caves are open for sight-seeing, the entrance should be restricted with an adequate to limit the changes of atmospheric phenomena. In rainy season, the surface water flowing outside of cave should be protected from entering into the caves and water pool should be drained out to outside of cave. Proper number of waste cans should be provided along the pathway in the caves.

齒科用 貴金屬 合金과 陶材사이의 化學的 結合에 關한 實驗的 硏究

林時德,남상용 대구산업정보대학 1992 논문집 Vol.6 No.-

Real bonding between metal and porcelain is influenced by various bonding Mecanisms which also influence each other, and is caused by aseries of complicated thermochemical reaction. For this reason, clear determination of the degree and distribution. Fators influencing the bonding strength consist of chemical bonding(including primary bond)52%, Mechanical bonding 22%, compression bonding 26%. Effects of the Base Metal Elements Added to Allots. The elements Sn, In, and Fe were added originally in accordanc with the concept that they might strengthen the Alloy though a dispersion effect. We heated the Degudent G. U Dental porcelain and analysis the surface elemental chang by Energy Dyspersive X-ray analysis and obtained the result that mainly the In element was concentrated to the alloy surface.

두개저 골절 환자의 임상적 고찰

이용성,송시헌,김성호,김관태,김윤 대한신경외과학회 1994 Journal of Korean neurosurgical society Vol.23 No.9

The authors analyzed 147 cases of basal skull fracture which were treated in the Department of Neurosurgery, Chungnam National University Hospital from Janwuy 1989 to December 1992. These fractures are difficult to diagnose by ordinary X-ray examination and are freguently inferred by clinical signs. The clinical features and radiological findings were reviewed. The results of the analysis are summarized as follows 1) The basal skull fractures were more common in men than women-the ratio being 6 1 1. 2) In decreasing order of cause of basal skull fractures were traffic accident~(77%), fall down, assault and slipping. 3) The minor head injury, Glasgow Coma Scale Score(GCS) of 13 to 15, was 79 cases(54%), the moderate head injury 40 cases(27%) and the severe head injury 18 cases(1996). 4) In decreasing order of clinical features were otorrhea(71 I) rhinorrhea(4856) and raccoon eye(33%) etc. 5) In decreasing order of the combined pathologies were skull fracture(55I 1, subdural hema-toma(l7%), epidural hematoma(l6%) and intraerebral hematoma(l2I) etc. 6) The facial nerve, vestibulocochlear nerve and optic nerve were the most commonly injured cranial nerve. 7) CSF leakage was noted in 139 cases and among them immediate type was far more common(%%) than the delayed type. 8) The incidence of meningitis was 5.4% and most of them associated with CSF leakage and the prophylatic antibiotic treatment has no effect to decrease infection rate. 9) In decreasing order of the frequency associated injuries were facial bone fracture (47%), clavicle fracture(19%), lower extremitics fracture(9%) and upper extremcties fracture(7%) etc.

감자식초의 항돌연변이원성 및 세포독성 효과

함승시,김미남,정용진,이득식 동아시아식생활학회 2001 동아시아식생활학회지 Vol.11 No.1

This study was performed to examine the antimutagenic and cytotoxic effects of potato vinegar and commercial vinegars(cider, brown rice, persimmon vinegars) on Salmonella typhimurium TA98. TA100 and cancer cell lines using Ames test and cytotoxicity assay, respectively. In Ames test, all vinegars did not exhibit any mutagenicity, but showed substantial inhibitory effects against N-methyl-N-nitro-N-nitrosog-uanidine(MNNG), 4-nitroquinoline-1-oxide(4NQO), 3-amino-1.4-dimethyl-5H-pyrido[4,3-b] indol(Trp-P-1) and benzo(a)pyrene(B(a)P). The number of revertants per plate decreased significantly when these vinegars(80㎍/plate) were added to the assay system using TA100 strain. Especially, potato vinegar(80㎍/plate) showed high inhibition rate of 69.9% against mutagenicity of B(a)P on TA100 strain. In the cytotoxicity assay, these vinegars also showed prominent cytotoxic activity against human cancer cell lines. Potato vinegar(10㎍/showed the strongest cytotoxic effect against HT1080 (fibrosacoma cell) and K562 (myelogenous leukemia) at the same concentration when compared with other vinegars.

廢棄物 成分分析 處理에 關한 硏究

車時煥,金容旭 慶熙大學校 1990 論文集 Vol.19 No.-

For the stabilization of leachate from municipal landfill treatment plants aerobic and anaerobic sludge digestion processes have been applied in mesoplilic temperature range. Uncertainty of the dynamics of leachate production has led to difficulties in the design and in plematation of control strategies, including full-scale leachate treatmente aperation. The general process, in order to control pollution effectively, require long retention time(10∼20days). In this study, thermal thermophilic aerobic digestion process for stabilization of study is a developed process based on the utilization of released heat from bio oxidation of organic matter to increase the process temperature in the therphilic temperature range(50-60℃). Possibility of pretreatment with coagulant including Chitosan solution, CaCO_3 and Diafloc mixture was tested on this raw leachate and aerated leachate. The results are summarized as follows. 1. Thermal thermophilic aerobic digestion temperature 50-60℃ at operation. 2. Effective for Chitosan solution, CaCO_3 and Diafloc of various flocculant at rapid mixing period 5 to 10 minutes. 1) Chitosan with 0.2mg/ℓ was resulted 97% removal of turbidity at pH 8. 2) When flocculant is used but COD and BOD was increasing after aeration. The major advantages of this study are process design for the destruction of pathognic micro organism normally contained in the leachate.

카드뮴 첨가된 α형 산화철에 의한 일산화탄소의 촉매산화 반응연구

이성한,김용록,김돈,정원양,김규홍,최재시 연세대학교 자연과학연구소 1983 學術論文集 Vol.11 No.-

α형 산화철에 카드뮴을 4mol%, 8mol% 및 12mol%로 각각 첨가시켜 외성영역의 특성을 갖는 산화물들을 제조하였다. 이 산화물들을 촉매로한 일산화탄소의 산화반응 속도론적 연구를 통하여 본산화물의 결함구조, CO 산화반응에 대한 촉매성 및 불순물 첨가효과등을 조사하였다. 또한 450℃에서 O_2 및 CO를 여러압력으로 도입시켜 Cd-doped α-Fe_2O_3의 전기전도도를 측정하고 이를 반응속도론적 데이타와 결부시켜 본산화물상에서 CO 의 산화반응 메카니즘과 율속단계를 제안하였다. 반응온도범위 350~460℃에서 산출된 활성화에너지는 10.1~11.3kcal.mol^-1이었다. CO_2흡착에 의한 CO산화반응의 억제효과는 본실험의 반응온도 영역인 350~460℃에서는 나타나지 않았으며 CO 산화반응의 전반응속도 차수는 1.5차로서 일산화탄소에 대해서는 1차, 산소에 대해서는 0.5차임이 밝혀졌다. 반응속도론적 데이타와 전기전도도 데이타에 의해 본촉매의 활성은 카드뮴도프로 인해 생성된 산소공위(Vo"-2e^-)에 기인한 것이었다. 카드뮴의 첨가량이 증가할수록 반응속도는 증가하였으나 12mol% 이상의 카드뮴이 첨가된 산화철상에서는 반응속도가 크게 증가하지 않는 것으로 나타났다. CO와 O_2는 근본적으로 화학흡착하며 CO의 흡착자리는 격자산소(O^-2_(latt))와 기흡착원산소 (O^-_(ads)), 그리고 O_2의 흡착자리는 산소공위(Vo"-2e^-)로 밝혀졌다. The α-Ferric oxide containing 4, 8, and 12mol% with cadmium were prepared. The oxidation rates of carbon monoxide in the presence of these oxide systems were measured to investigate the defect structure, the catalytic activity for the oxidation of carbon monoxide, and the impurity effect. The conductivity was also measured at 450℃ under the various pressures of oxygen and carbon monoxide. From the agreement between the kinetic and conductivity data, the oxidation mechanism of carbon monoxide and the rate determining step on this oxide catalyst were suggested. In the temperature range from 350 to 460℃, the calculated activation energy for the CO oxidation over Cd-doped α-Fe_2O_3 systems were 10.1∼11.3kcal·mol^-1. The inhibition by an adsorbed CO_2 during the CO oxidation was not observed in the above temperature range. The overall reaction order for the CO oxidation is 1.5; the first order with respect to CO and the one-half order with respect to O_2. The catalytic activity of this oxide system is due to oxygen vacancies induced by Cd-doping. The oxidation rates increase with increasing the amount of dopant and above 12mol%, however, don't highly increased. CO and O_2 are essentially chemisorbed as ions and the adsorption sites for CO are the lattice oxygens (O^2-_(latt)) and prechemisorbed oxygens (O^-_(ads)), the adsorption site for O_2 is the oxygen vacancies (Vo¨-2e^-).

새마을 運動 實績評價模型 作成에 관한 硏究

黃明燦,玄斗日,梁始浩,朴英熙,金龍國,申大淳 건국대학교 1974 學術誌 Vol.17 No.1

The New Village (Sae-ma-eul) movement is Korean version of Community Development that has under-gone widespread exploration, experimentation and application in developing countries throughout the world in recent years. In most countries the national governments have undertaken the iniative in Community Development through appropriate ministries or special agencies. The New Village Movement was initiated in 1970 by Korean government. But it became a people's movement for self-development as more and more people participated in the developmental programs. The major objectives of the New Village movement are to redress the economic disparities between the rural and urban areas by improving the economic, social and cultural conditions of rural Communities, to reform the way of life in rural villages by encouraging the attitude of self-help, and to increase the income of the farmers and fisher man. Since 1971, An enormous amount of public and priate money has been invested into the New Village Movement. It seems that the time has arrived when some framework for evaluating the whole program is to be developed. Thus, The objective of this study is to develop an appropriate to evaluate the new village project at the village level. Ten major factors which are supposed to be relevant for evaluation of the project was selected. The evaluation model thus developed can be summarized in the following format. ◁표 삽입▷ (원문을 참조하세요)

Captopril과 Nifedipine 병합요법의 강압효과에 관한 임상적 연구

이영수,문언수,김준호,공수정,정시진,주용진,정상만 건국대학교 의과학연구소 1993 건국의과학학술지 Vol.3 No.-

Background: The hypotensive effect of captopril(angiotensin converting enzyme inhibitor) and nifedipine(calcium channel blocker) was studied. Method: Captopril(75mg) and nifedipine(30mg) were administered in 30 hypertensive adults during twelve weeks after a week observation for washout with stepwise increments of the dose according to the patient's blood pressure in every two weeks. Result: The supine blood pressure were decreased from 169.5±22.3/104.0±20.3 mmHg to 130.4±21.3/82.4±19.5mmHg at the end of twelve weeks during therapy.(p<0.05) The standing blood pressure were also decreased conferrably and to the some lower level. Hematologic examination and blood chemistry revealed no discernible abnormal findings before and after the treatment. During the period of the study a few probably drug-related symptom such as cough and headache, gastrointestinal disturbance developed but not troublesome enough to administering. Conclusion: Captopril and nifedipine regimen is well tolerated and effective in the treatment of hypertensive patients.

Insect-specific microRNA involved in the development of the silkworm Bombyx mori

Yong Zhang,Xue Zhou,Xie Ge,Jiang-Hao Jiang,Mu-Wang Li,Shi-Hai Jia,Xiao-Nan Yang,Yun-Chao Kan,Xue-Xia Miao,Guo-Ping Zhao,Fei Li,Yong-Ping Huang 한국응용곤충학회 2009 한국응용곤충학회 학술대회논문집 Vol.2009 No.10

MicroRNAs (miRNAs) are endogenous non-coding genes that participate in post-transcription regulation by either degrading mRNA or blocking its translation. It is considered to be very important in regulating insect development and metamorphosis. Insects are the largest group of animals and are extremely valuable in biological and agriculture research. Insects are also important pests to human health and agriculture, and efforts are necessary protect both humans and plants from disease and damage. Despite their importance, insects lag behind mammals, nematodes, and plants in miRNA research. At present, only 279 insect miRNAs have been identified from Drosophila melanogaster, Anopheles gambiae, Apis mellifera, Bombyx mori, and D. pseudoobscura in miRBase, and most of these miRNAs were computationally predicted without experimental validation. Functional analysis of insect miRNAs has only been conducted in D. melanogaster.