마이크로파로 가열된 리튬 실리케이트계 무기고분자의 핵 생성 및 결정화에 관한 연구

박성수,박찬영,민성기 釜慶大學校 1999 釜慶大學校 論文集 Vol.4 No.1

A comparison of nucleation and crystallization of amorphous lithium silicate under the conventional and microwave processing was investigated. Optical microscopy(OM). X-ray diffractometry(XRD), and differential thermal analysis(DTA) were used to evaluate the results. Both conventional and microwave heat-treated samples had same nucleation temperature, 460~480℃, and same temperature of maximum nucleation rate, 580℃. From the results of DTA, the probability for the bulk crystallization increased in the microwave heat-treated samples. compared to conventional one. Degree of crystallization increased with increasing crystallization temperature in both conventional and microwave heat-treated samples. However, pattern of spherulites growth under the microwave processing appeared to be quitely different from that under the conventional one due to its internal heating.

난소에 전이된 간세포암 1예

박용관,박치영,조은택,조기섭,박찬국,송창훈,이미자,기근홍 朝鮮大學校 附設 醫學硏究所 1995 The Medical Journal of Chosun University Vol.20 No.2

Hepatocellular carcinoma frequently metastasizes through direct extension, lymphatic, and hematogenous routes. The most common sites of metastasis are the lungs and the lymph nodes, glands, bones, spleen, kidneys, colon, and pleura are the sites of metastasis in decreasing order of frequency. But metastasis to the ovary is very rare. It is thought that metastasize to the ovary occurs through infiltration or dissemination. However, we observed ovarian metastasis of primary hepatic tumor in a 34-year old female who suffered from lower abdominal pain. At first, it was diagnosed as a primary ovarian tumor. But histologically, it presented sinusoidal pattern surrounded by the tumor cells and contained rounded by the tumor cells and contained round hyaline globules in minority of the cytoplasm. Then, the histologic features of percutaneous, sono-guided liver biopsy speecimen of the liver mass are similar to those of resected ovarian tissues. Therefore, we concluded that ovarian tumor was originated from hepatocellular carcinoma. In summary, this report examines a case of hepatocellular carcinoma with ovarian metastasis in a female and reviews the literature.

구-막대 시스템에서 CDM을 사용한 강인한 제어기 설계

이호기,박용식,정찬수 崇實大學校 1999 論文集 Vol.29 No.1

All the controller design problem for linear time invariant dynamic system boils down to proper selecting the characteristic polynomials and numerator polynomials for concerned input-output relations. The propel selection of the characteristic polynomial is not so difficult, if only stability and response are to be satisfied, but it becomes complicated when robustness issue is added. The CDM could be a solution to this problem. CDM which is developed by Lipatov's conditions for stability and Kessler's standard form is easy to process of the controller design, especially it is more useful when the specifications are the settling time, rising time and overshoot. In this paper was used CDM design a simple but robust controller of the ball and beamsystem. The ball and beam system is highly nonlinear system. And it's linear transfer function used to design the controller. But CDM proved to be a solution to design even if there are some uncertainties like this linearized ball and beam system by simulations.

압축력을 받는 결함이 있는 구조물의 주파수 해석

姜贊泳,柳擇仁,朴鳳賢,李晟熙,韓秉基 弘益大學校 科學技術硏究所 1998 科學技術硏究論文集 Vol.9 No.1

Vibration analysis of through-the-width-split beams for predicting buckling load is investigated based on Euler-Bernoulli beam theory. In split region, each segment is considered as a solid beam. In this region, recurrence equations relating integration constants for adjacent interior regions are established by satisfying continuity conditions at junctions of interior regions. The results of present study are compared with those of experiment and their results give good agreement with each other. From the result, it was shown that local buckling phenomena could appear in fundamental mode, however, there exists load carrying capacity after this phenomena.

Pd(O)-촉매를 이용한 알릴 고리 카보네이트의 제거 및 분자간 축합반응 연구

강석구,박동철,박찬희,홍륭기 성균관대학교 기초과학연구소 1995 論文集 Vol.46 No.1

The alkyl substituted allylic cyclic carbonates 1a-d undergo elimination by using a catalytic amount of Pd(0) complex to form dienols 2 a-b. However, on treatment of the unsubstituted or phenyl substituted allylic cyclic carbonates 1e and 1f with Palladium(0) catalyst, deprotonation-elimination of π-allyl Palladium complex followed by condensation with the other π-allyl Palladium complex provided the coupled products 3a and 3b, respectively.

학동기 비만아동의 피부두께의 통계적 관찰

김경석,나기찬,정은경,문경래,박상기,박영봉 朝鮮大學校 附設 醫學硏究所 1993 The Medical Journal of Chosun University Vol.18 No.1

The measurements of triceps skinfold thickness, body weight and height were done in children aged 7 to 12 years(3,142 boys and 2588 girls) in Kwangju in 1992. The author also observed degree of obesity, prevalence of obesity and average value of triceps skinfold thickness. The results were summarized as follows: 1) The mean value of triceps skinfold thickness acceding to age in male was 7 years 10.5mm, 8 years 10.5mm, 9 years 10.2mm, 10 years 12.3mm, 11 years 13.8mm, 12 years 12.3mm. In the female it was 7 years 11.9mm, 8 years 11.9mm, 9 years 11.6mm, 10 years 12.6mm, 11 years 14.1mm, 12 years 13.6mm. 2) The mean value of triceps skinfold thickness acceding to age in obese male was 7 years 16.3mm, 8 years 17.3mm, 9 years 16.0mm, 10 years 19.5mm, 11 years 23.7mm, 12 years 20.1mm. In the obese female it was 7 years 17.3mm, 8 years 17.9mm, 9 years 18.4mm, 10 years 19.5mm, 11 years 21.2mm, 12 years 20.3mm.

공초점 레이저 주사 현미경을 이용한 법랑질 초기 우식 재광화의 정량적 분석

차승우,윤태철,박성호,이찬영,금기연 대한치과보존학회 2001 Restorative Dentistry & Endodontics Vol.26 No.1

Dental Caries which has high prevalence rate, accounts for majority of dental diseases. Many treatment and preventive treatment has been developed, thereby reducing the prevalence rate, but in our country, flouridization has not spread widely yet, so prevention has not been done satisfactorily. When dental caries progresses, irreversible damage of tooth structure occurs. In initial dental caries. Demiteralized tooth structure can be remineralized, so restorative treatment is unnecessary. In the study, 20 teeth restored with composite resin without fluoride release were used and divided into two groups. Incipient dental caries were artificially made and remineralization procedure was done for 1 and 2 weeks, for each group. Changes in mineral contents aroud the margins were analysed with confocal laser scanning microscope. The results were as follow. 1.Both total fluorescence of the lesion and average fluorescence of the lesion of remineralized samples decreased compared to demineralized state. (p<0.01) 2.Confocal laser scanning microscopy can be used in quantitative analysis of mineral change. In result, confocal laser scanning microscopy can be used in quantitative analysis of mineral change and it could be used in many different fields of dentistry in the future. Key words : Confocal laser scanning microscopy. Demineralization. Remineralization, Initial dental caries

Two Stage 발효에 의한 고산도 식초 생산

이영철,이금용,김형찬,박기범,유익제,안평욱,최춘언,손세형 한국산업미생물학회 1992 한국미생물·생명공학회지 Vol.20 No.6

산업적으로 산도 17.0% 이상의 고산도 식초를 생산하기 위하여 반연속식인 1st stage와 유가식인 2nd stage로 구성된 two stage 초산 발효를 온도 30 ℃, 교반속도 600 rpm, 통기량 0.1 vvm에서 실시하였다. 1st stage에서 초기 에탄올 농도를 50.0 g/ℓ, 잔류 에탄올 농도를 5.0 g/ℓ로 정하여 반연속적으로 초산발효를 하고, 2nd stage 에서 발효시간의 경과에 따라 에탄올을 유가식으로 첨가하여 초산발효액내의 에탄올 농도를 5.0 g/ℓ에서 10.0 g/ℓ로 유지했을 때 산도가 17.6%인 고산도 식초를 생산할 수 있었으며, 또한 이 ??의 최대 초산 생산성은 3.3 g/ℓ·hr였다. The production of vinegar containing 16.0 ∼18.0% of acetic acid was examined in two stage fermentation consisting of semi-continuous and fed-batch type. The optimum conditions were obtained when the fermentation was carried out at agitation of 600 rpm, aeration of 0.1 vvm and temperature of 30℃. The initial and residual ethanol concentration in 1st stage were 50.0 g/ℓ and 5.0 g/ℓ, respectively, and the ethanol concentration in 2nd stage was maintained from 5.0 to 10.0 g/ℓ. The maximum productivity was 3.3 g/ℓ-hr and the acidity was 17.6% after the two days of acetic acid fermentation.

수술 전 진단된 충수돌기 점액류종 1례

허광식,손현화,김동규,박찬국,김만우,김정용,기근홍 조선대학교 부설 의학연구소 2000 The Medical Journal of Chosun University Vol.25 No.1

Primary unruptured appendiceal mucocele is a rare disease. It is very difficult to diagnose preoperatively because of the rarity of classical symptoms and low incidence. Usually it is discovered incidentally during abdominal ultrasonography(US), computed tomography(CT), or appendectomy for acute appendicitis. If untreated, one type of mucoceles may rupture producing a potentially fatal entity known as pseudomyxoma peritonei, therefore preoperative diagnosis is very important. With the advent of colonoscopy, abdominal US and CT, it has been possible to preoperatively diagnose mucocele of appendix. We experienced a case of appendiceal mucocele in a 60 year-old woman who had symptoms of lower abdominal discomfort and right lower quadrant abdominal pain, and it was diagnosed preoperatively by colonoscopy, abdominal US and CT. So we present this case with review of literature.

식도에 발생한 원발성 소세포암 1예

류보열,김태종,곽재정,김영학,박찬국,김만우,이승일,기근홍 조선의대 1995 The Medical Journal of Chosun University Vol.20 No.2