규산 나트륨으로부터 THF에 의해 추출된 규산을 이용한 Mullite 전구체 제조시 촉매에 대한 영향

정흥호,박은희,김도수,정호승,노재성 공주대학교 자원재활용신소재지역협력센터 2000 2차년도 센터 사업 성과집 Vol.2000 No.1

Sol-Gel법으로 Aluminum isopropoxide[Al(i-OC3H7)3]와 규산나트륨로 부터 THF로 추출한 규산을 사용하여 mullite 겔 분말 제조시 산염기촉매의 영향에 관하여 XRD, TGA. SEM, 및 BET를 이용하여 연구하였다. 산성촉매로는 염산 (HCl)과 질산(HNO3)을, 염기성촉매로는 암모니아 (NH4OH)를 사용하였다. 촉매에 따른 중량 감소는 HCI=32.6% > HNO3=25.43% > Non=24.0% > NH4OH=22.5% 순서로 나타났다. 입자의 형태는 산성촉매인 경우 구형의 입자를, 염기능촉매의 경우는 구형이 아닌 입자형태를 나타내었다. 1400℃에서 하소한 분말은 촉매의 종류에 관계없이 0.05∼0.1㎛ 크기의 매우 미세한 입자들의 응집체임을 알 수 있었다. 그리고 촉매의 종류에 관계없이 온도가 증가할수록 흡착할 수 있는 세공이 줄어듬을 알 수 있었고, 염기 촉매를 사용하는 경우의 mullite 비표면적 변화가 거의 없는 내열성을 가지고 있었다. Effect of catalysts, which was catalyzed by acid(HCl and HNO3) and base(NH4OH), on characteristics of the mullite powders prepared by sol-gel method was investigatad by XRD, TGA, SEM and BET. As a result, weight loss as a function of catalysts was in order of HCI=32.6% > HNO3=25.43% > Non=24.0% > NH4OH=22.5%. The mullite powder dried at 100℃ appeared spherical shape in acid catalyst and different shape in base catalysts but sintering powder at 1400℃ appeared very fine particle of 0.05~0.1 ㎛ ragardless of catalysts. In all case, the pore quantity, which was capable to adsorption, was decreased with increasing temperature. In base catalyst, no change of special surface area in mullite appeared.

바나나 과실 함유탄닌이 소화효소 작용에 미치는 영향

정정한,류충호,조영수 東亞大學校附設遺傳工學硏究所 1997 遺傳工學硏究 Vol.- No.4

바나나 과실을 시중에서 구입하여 미숙과실과 황숙과실로 구별하고 이것을 과육부분과 과피부분으로 나누어서 동결건조 및 열풍건조시켜 실험 시료로서 사용하였다. 탄닌 함량을 분석한 결과 황숙과실 보다도 미숙과실에서 높았으며, 과육보다는 과피에서 열풍건조 보다는 동결건조시킨 시료에서 높은 경향을 나타내었다. 탄닌의 분획은 Sephadex LH-20칼럼을 사용하여 분획하였다. 바나나 과실에서 함유하고 있는 탄닌은 prodelphinidin, procyanidin을 구성단위로 하는 proanthocyanidin류의 축합성 탄닌으로 이러한 탄닌은 소화효소인 trypsin(EC 3. 1. 1. 3), α-amylase(EC 3. 4. 21. 4), lipase(EC 3. 2. 1. 1)에 대하여 in vitro에 있어서 저해작용을 가지고 있는 것이 확인되었으며 또한 탄닌은 중합도가 높을수록 저해율이 높다는 것이 확인되었다. It has been shown that tannins have adverse effects on growth of animals and feed utilization. Tannins are usually classified into hydrolyzable and condensed types but the adverse effects are more marked in condensed tannin in hydrolyzable tannin. Furthermore, the principle condensed tannins found in banana fruits are pro types by the polymerization of flavan-3, 4-diols either alone or in combination with other flavonoids such as catechins. Tannin of the investigated banana(Banana;Musa sapientum LINN)fruits was fractionated into four or five molecular forms, according to the degree of polymerization by chromatography on a column of Sephadex LH-20. The protein-precitating capacity of the fraction noted tannins increased in degree polymerzation. The inhibitory effect of tannins on trypsin(EC 3. 4. 21. 4), α-amylase(EC 3. 2. 1. 1) and lipase(EC 3. 1. 1. 3) activities in vitro also increased with the increased in degree of polymerization.

수확후 채소류에 발생하는 진균독소의 탐색과 방제(Ⅱ) 이병된 양념 채소류(양파, 마늘, 고추)에서 주요 진균독소 검출

정일민,주호종,심성철,백수봉,유승헌 충남대학교 생물공학연구소 1999 생물공학연구지 Vol.7 No.-

수확후 Alternaria, Penicillium 및 Fusarium에 이병된 고추, 양파, 마늘을 HPLC로 주요독소들을 검정한 결과 고추에서 Alternaria 독소의 AOH(alternariol)는 소량∼440㎍/g 및 ALT(altenuene)는 소량∼103㎍/g, TeA(tenuagonic acid)는 249∼342㎍/g 및 AME(alternariol monomethyl ether)는 206∼294㎍/g이 검출되었고 양파, 마늘에서 Penicillium 독소의 citrinin이 2.8∼18.4㎍/g, penicillin-G는 0∼439.0㎍/g, penicillic acid는 0∼10.2㎍/g 및 patulin은 0∼7.0㎍/g 검출되었다. 그리고 양파, 마늘에서 Fusarium 독소로는 fusaric acid가 0∼553.6㎍/g 검출되었을 뿐 deoxynivalenol과 nivalenol은 검출되지 않았다. The major mycotoxins were detected from peppers, onions and garlics infected postharvest pathogens, Alternaria, Penicillium and Fusarium. Analyses of the major mycotoxins were conducted using HPLC. Detected Alternaria mycotoxins per gram of infected postharvest peppers were alternariol (AOH) with amount ranged from small quantity to 440 ㎍/g, altenuene (ALT) with amount ranged from small quantity to 103 ㎍/g, tenuagonic acid (TeA) with amount ranged from 249 to 342 ㎍/g and alternariol monomethyl ether (AME) with amount ranged from 206 to 294 ㎍/g. Penicillium toxins per gram of infected postharvest onions and garlics were citrinin with amount ranged from 2.8 to 18.4 ㎍/g, penicillun-G with amount ranged from no detection to 439.0 ㎍/g, penicillic acid with amount ranged from no detection to small quantity and patulin with amount ranged from no detection to small quantity. Fusarium toxins per gram of infected postharvest onions and garlics were fusaric acid with amount ranged from no detection to 553.6 ㎍/g. However, deoxyrivalenol and nivalenol were not detected from onins and garlics infected by Fusarium.

갑상샘 유두암과 혼재하여 발견된 편평세포암 1예

김호수,정태식,정정화,김수경,이상민,정순일,함종렬 영남대학교 의과대학 2011 Yeungnam University Journal of Medicine Vol.28 No.2

The occurrence of a mixed tumor containing papillary thyroid carcinoma (PTC) and primary squamous-cell carcinoma (SCC) is rare because there is no squamous epithelium in the thyroid gland. Reported herein is a 30-year-old female with mixed PTC and primary SCC of the thyroid presented as thyroid incidentaloma. Fine-needle aspiration biopsy of the thyroid nodule revealed the presence of malignant thyroid cells. The histopathological examination following total thyroidectomy yielded two mixed, morphologically distinct histotypes that included PTC and SCC. After total thyroidectomy, the patient underwent radioactive iodine therapy. No recurrence or metastasis occurred during the 20-month follow-up period after the operation.

cis-Diamminedichloroplatinum (Ⅱ)이 Hamster 근위곡요세관 상피세포의 미세구조에 미치는 영향

정호삼,이창수,이규식 한양대학교 의과대학 1987 한양의대 학술지 Vol.7 No.2

cis-Diamminedichloroplatinum (II) (cis-DDP), a metallic compound, similar to bifunctional alkylating agent and has been known as an effective anticancer drug. Cis-DDP is known to inhibit cell division and is so effective to suppress the solid tumors that it has been used in the therapy of acute ovarian tumor, acute epithelial tumor in the neck, bladder cancer and thyroid cancer. cis-DDP reacts with guanine bases of DNA in the cell that it inhibits DNA synthesis, cell division and protein synthesis consequently. It exhibits no specificity with regard to type of cells that it acts on the normal cells as well as cancer cells during therapy. So the author undertook the present study to pursue the effect of cis-DDP on the cytoplasmic organelles of epithelial cell in kidney. Hamster was used as an experimental animals. The experimental animals were killed at 12, 24 and 48 hours after administrations of 6 mg/kg of cis-DDP. The specimen obtained from the renal cortex were fixed and stained with uranyl acetate and lead nitrae. And these preprations were observed with the JEM 100B electron microscope. The results obtained were as follows. 1. The cisternae of rough endoplsmic reticulum were sacculated and membrane bound ribosomes were detached at the epithelium of proximal convoluted tubles in the 24 and 48 hours cis-DDP treated hamster group. 2. Mitochondria were swollen and cristae of mitochondria were not seen at the epithelian cells of proximal convoluted tubules in cis-DDP 48 hours treated hamster group. 3. Vesicles and vacuoles increased in number with time at the epithelium of proximal convoluted tubules in cis-DDP treated hamster groups. 4. Microvilli were segmented at the epithelium of proximal convoluted tubules in cis-DDP 48 hours treated hamster group. Consequently it is suggested that cis-DDP induces the damage in the epithelial cells of proximal convoluted renal tubule.

소아기 외과계질환의 통계적 관찰

정용헌,이재호,이건수,서종진 충남대학교 의과대학 지역사회의학연구소 1989 충남의대잡지 Vol.16 No.2

Child is not little man but rather a father of man. Children are faced to surgical and medical problems reqiring various specialists. Authors analized 1126 pediatric surgical in-patients of Chung-nam National Univ. Hospital from Jan. to Dec. 1988 by departments, age, sex, duration of admission and types of diseases in order to get the information for management of children’s hospital. The results are as follows: 1. Absolute numbers of in-patients by departments are above 200 in general surgery and opthalmology, between 100-199 in plastic surgery, ENT, chest surgery and below 99 in urology and neurosurgery. 2. Male to female ratio as a whole is 1.8:1, male dominant. 3. Duration of admission within 1 week was of 55% as a whole, 87% in ENT, 85% in ophthalmology, 13% in orthopedic surgery. 4. Average duration of admission was 10.8 days as a whole, 4.6 days in ENT, 5.1 in ophthalmology, 29.7 days in orthopedic surgery, and variable by types of diseases. 5. The most frequent disease by departments was hernia in general surgery, fracture in orthopedic surgery, cerebral contusion in neurosurgery, ventricular septal defect in chest surgery, strabismus in ophthalmology, tonsillitis & adenoiditis in ENT.

歐洲地域의 學問動向 硏究 : 文學, 哲學, 經營學의 動向

李文浩,鄭喆,金洙正,李正道 慶北大學校 人文大學 1982 인문학총 Vol.7 No.-

This modern age is a time of divided learning. In ancient times, at the beginning, there was one philosophical thinking and from that the special sciences separated gradually. Today, all knowledge has tendencies to become more and more detailed. Certain sciences of today have no relation to any philosophy in spite of the past relationship. Because of specialised learning, there is today less research for the ultimate reasons, and more research in minutiae. These days mam does not intend to obey nature but intends to control it. Man can think that this world is composed of material staff only. This is the aspect of this modern age. Unfortunately neither science nor materialism can save our modern age. Love, however can do it. Love is the ultimate thing in the world. Therefore, we haue value Gabriel Marcel's theory of love.

일반향 응고법에 의한 InP 결정 육성

김호건,정익수 漢陽大學校 基礎科學硏究所 1993 基礎科學論文集 Vol.12 No.-

일방향 응고법(unidirectional solidification)에 의하여 Ⅲ-V족 화합물 반도체인 InP결정을 육성한 후 결정육성을 위한 기초적 조건을 연구하고 합성된 InP의 전기적 특성을 조사하였다. 길이 50cm의 석영관을 준비하고 석영관의 밑바닥에 인(phosphorus)을 넣고 석영관의 하단으로 부터 15cm윗부분에 인듐금속이 들어있는 석영crucible을 장착하고 석영관 내부의 압력이 10-5torr가 되도록 유지한 후 밀봉하였다. 석영관 밑바닥에 들어있는 P를 450℃의 온도에서 승화시켜 crucible내에 녹아있는 인듐금속에 diffusion되도록 하여 InP조성을 만든 후 시간당 2∼5℃/h의 속도로 서냉시켜 결정을 육성하였다. 육성된 결정에 대하여 X선회절분석과 배면 Laue반사법을 이용하여 InP합성의 여부 및 단결정성을 확인하였고 Van der Pauw법을 이용하여 온도의 변화에 따른 electron mobility, 비저항 등의 전기적 성질을 측정하였다. 각 조건에서 합성된 물질은 InP였으며 주로(111)방향으로 성장하였다. 융액의 냉각속도를 5℃/h이상 비교적 빠르게 했을때는 조성적 과냉각에 의하여 단결정성이 좋지않았으며 2℃/h의 비교적 느린 속도로 결정을 육성하였을때 비교적 양질의 결정을 육성할 수 있었다. XRD분석 및 광학 현미경을 이용한 미세구조 관찰 결과 초기 냉각부분(first freeze portion)인 ingot의 하단에서 후기 냉각부분인 ingot의 상단으로 갈수록 단결정성이 좋은 것으로 밝혀졌다. 전기적 성질을 알아보기 위해서 Hall effet를 측정한 결과 InP결정은 n형 반도체임이 확인되었고 150K∼300K의 온도범위에서 carrier의 농도는 1015∼??이었고 carrier의 이동도는 온도가 증가함에 따라 감소하였으며 그 값은 30X10³∼2×10³㎠/Vsec의 범위였다. Ⅲ-V group compound semiconducter, InP crystal, was prepared by unidirectional solidification method and the fundamental conditions for crystal growth were investigated. Phosphorous (P) powders (99.999% purity) were put into the bottom of a quartz ampule. A quartz crucible charged with Indium metal(99.99% purity) was attached at the upper side in the quartz ampule. The quartz ampule containing quartz crucible was made vacuous under the pressure of 10-5 torr and sealed up. Indium(In) metals in the quartz crucible were melted at 1070℃ and sublimed phosphorous vapors were diffused in Indium melt unidirectionally so that the melt of InP composition was formed from the lower part to the upper part in the quartz crucible. By cooling the InP composition melt, crystal were grown. The grown crystals were characterized by X-ray and microstructure observation under the polarized optical microscope and electrical properties of crystals were measured by Van der Pauw method. The ingots obtained at various cooling rate were identified as InP crystals which had the main growing direction of <111>by the X-ray analysis. The InP single crystals were obtained upper side of the ingot at slow cooling rate of melt. It was found that the InP crystals were n-type semiconducter, that the concentration and mobility of carrier were 1015∼1016/cm-3 and 30X10³∼2×10³㎠/V·sec, respectively.

전류제어형 PWM컨버터를 이용한 동기발전기용 여자시스템에 관한 연구

장수진,류동균,서민성,김준호,원충연,이진국 성균관대학교 2003 학술회의지원논문목록집 Vol.2003 No.-

동기발전기 출력전압은 여자시스템의 계자전류 제어에 의해 일정하게 유지된다. 고주파 PWM 컨버터(전류제어모드 buck컨버더)형태의 여자시스템은 부하변동이 발생하였을 때 동기발전기의 계자전류를 제어하게 된다. 이 논문은 정상상태 및 과도상태에서의 안정화를 개선하기 위하여 여자시스템의 설계 및 실험에 대해 다루었다. 시뮬레이션 및 실험 결과는 제안된 여자시스템이 50kW 동기발전기의 DVR에 의해 응답시간이 개선되었음을 보여주었다. The output voltage of synchronous generator is regulated constantly by field current control in excitation system. High frequency PWM converter (current control mode buck conveter) type excitation system for synchronous generator is able to control exciter current when the load change happened. This paper deals with the design and evaluation of the excitation system for a synchronous generator to improve the steady state and transient stability. The simulation and experimental results show that the proposed excitation system is able to improve the response time by the DVR(digital voltage regulator) of 5O[kW] synchronous generator.

까치복의 呈味成分

李應昊,鄭秀烈,趙舜榮,錢重均,車庸準 釜山水産大學校 1983 釜山水産大學 硏究報告 Vol.23 No.1

까치복의 呈味成分에 관한 資料를 얻고자 核酸關聯物質, 유리아미노산, TMAO, TMA, betaine 및 총 creatinine을 分析하였다. 核酸關聯物質 중 IMP가 1.9μmole/g으로서 가장 많았고, 全核酸關聯物質에 대해 39.6%를 차지하였다. 유리아미노산 중 함량이 많은 것은 taurine, lysine, alanine 및 glycine 이고, 이들 네 가지 아미노산이 전유리아미노산의 68.2%를 차지하였다. 총 creatinine�량은 194.5mg/100g으로서 엑스分窒素에 대해 63.4%를 차지하였으며, TMAO 및 betaine 함량은 微量이었다. Omission test 結果 까치복의 呈味成分은 5'-mononucleotides 및 유리아미노산이 주된 구실을 한다는 것을 알았다. Yellowfin puffer, Fugu xanthopterus(Temminck et Schlegel), is one of the most palatable fishes in Korea. However, relatively little is known about the characteristics of its taste. In this study, the taste compounds including nucleotides and their related compounds, free amino acids, trimethylamine oxide, trimethylamine, betaine and total creatinine were analyzed, and their roles in tasting activity were investigated. The amounts of IMP was 1.9 μmole/g, and the ratio of IMP to the total nucleotides and their related compounds was 39.6%. The great portion of free amino acids in the extractives of yellowfin puffer muscle was occupied by taurine, lysine, alanine and glycine in order, and their content was 79.1% of the total free amino acids. Among the organic bases, total creatinine was abundant, and its nitrogen content was 63.4% of total extractive nitrogen. According to the results of the omission test, the main constituents of the characteristic taste of yellowfin puffer could be assumed as free amino acids and 5'-mononucleotides.