梁建植 文學硏究

朴湧植,高宰錫 고려대학교 민족문화연구소 1991 民族文化硏究 Vol.24 No.-

Ti(C,N) 코팅에 의한 SKD11강의 내마모성 개선 연구

박재용,김흥식 울산대학교 2000 공학연구논문집 Vol.31 No.1

코팅층의 밀착력을 향상시킬 목적으로 SKD11강을 플라즈마 질화하여 질소 확산층을 형성하고, 그 위에 PACVD법으로 TiN및 Ti(C,N)코팅층을 형성시키는 연구를 수행하였다. PACVD공정에서 메탄(CH₄) 가스의 유입량이 증가되면 코팅층 두께와 경도는 증가하는 경향을 보였지만 내마모성을 감소하는 경향을 보였다. 메탄(CH₄) 가스와 유입량이 2vol.% 일 때 최대 임계박리 하중은 54N을 얻을 수 있으며 이때 코팅층의 두께는 2㎛이고 경도는 650Hv(50g 하중)이다. Ti(C,N)코팅층의 탄소와 질소 농도는 표면쪽에는 탄소가, 코팅층과 소재사이 경계면에는 질소의 농도가 높은 즉, 농도가 경사진 코팅층이 형성되었다. 코팅층의 경도와 임계박리 하중은 공정중의 템퍼린 효과 때문에 강의 템퍼링 온도에 무관하며 강의 표면조도는 코팅층의 조도, 경도 및 내마모성에 영향을 주지 않았다. The formation and characterization of TiN or Ti(C,N) coatings on SKD11 tool steel nitrided prior to the coating layer formation for the strengthening of adhesive properties of coatings have been conducted. The thickness and hardness of the coatings increased with the increase of methane(CH₄) gas flow rate. However, wear properties of the coating were impaired by the increase of emthane(CH₄) gas flow rate. Maximum critical excoriation load of 54N for the Ti(C,N) coating was obtained with the methane(CH₄) flow rate were 2㎛ and 1650Hv(with the load of 50g) respectively. The concentration of carbon and nitrogen was graded from the outer surface of the coating to the coating/alloy interface. Concentration of carbon was higher at the outer surface of the coating and the nitrogen concentration was higher at the interface. The hardness and critical excoriation load of the Ti(C,N) coating was not dependant of the surface roughness and tempering temperature of SKD11 steel prior to the coating layer formation.

에탄올 탈수 PSA 공정의 전산 모사 및 설계 최적화 연구

박융호,최재식 漢陽大學校 工學技術硏究所 1997 工學技術論文集 Vol.6 No.1

A model for scale-up of PSA process of ethanol dehydration was established using bench experimental data. LDF mass-transfer model, Langmuir adsorption isotherm and single-component adsorption were assumed in the model and the coefficients for heat and mass transfer in the beds were fitted against the experimental data. Model equations were solved using a DAE solver (Speed Up). The effects of cycle time, P/F ratio, adsorption pressure, bed length were examined, and the dimension and the operating condition which give optimum peformance for a commercial process were determined.

한랭작업 근로자들의 건강위해에 관한 연구

박호추,정설미,문덕환,이종태,김대환,김정호,최재일,황용식,이용희,이채언 大韓産業醫學會 1999 대한직업환경의학회지 Vol.11 No.1

In order to evaluate the status of cold exposure and its health hazards of workers at cold storage workplaces and to provide basic data for effective health care, the author measured core temperature and also observed clinical symptoms and signs, past and present history, and general health examination data on 99 cold exposed workers for exposure group and 96 non-exposed workers for control group working at 2 food refrigerating companies in Pusan area from January 6, 1998 to February 24, 1998. The results were as follows: 1. There was statistically significant difference in water intake between the exposure and control group and increased urine volume, urine frequency in exposure group without statistically significant difference. 2. Past and present illness in exposure group were hypertension (18.2%), hepatopathy (8.1%), gastro-intestinal disease(7.1%), arthritis (4.0%), intervertebral disc herniation(4.0%), and so on, and hypertension, arthritis was statistically significant difference compared to control group. 3. Symptoms in exposure group were fatigue(89.9%), headache (64.6%). drowsy(63.6%), neck stiffness(59.6%), excessive food intake(59.6%). general weakness(58.6%), hunger(58.6%), numbness(54.5%), and so on, and there was statistically significant difference between the exposure and control group except fatigue, drowsy. 4. As results of clinical test abnormality rate of the systolic, diastolic blood pressure and electrocardiogram were significantly higher in exposed group than control. 5. Core temperature in exposure group was statistically significantly lower than control group and the highest statistically significant inverse correlation with the working hours and working frequency of daily mean cold storage. As above results, the author suggested that the further studies should be conducted to evaluate the health status of workers about chronic health effects in cold workplaces and to establish effective health care methods for them.

방사선 측정 및 해석 연구 : 원자로 냉각수중의 방사능해석에 의한 결함핵연료봉의 평가 Assessment of Defected Fuel by Analysis of Reactor Coolant Activities

양재춘,오희필,전재식,이호연,오헌진,정문규,박해용 충남대학교 기초과학연구소 1987 연구논문집 Vol.7 No.-

중성자와 우라늄의 핵반응에 의해 생성된 핵분열생성물의 물리적 특성을 이용하여 원자로 내의 핵연료 상태를 해석하는 모델을 개선하였다. 이 모델에서는 고체 핵연료 내에서 특정핵종의 핵분열생성물의 생성과 이것이 원자로 냉각재까지 방출되는 과정을 계산하고 추적하여 방사능농도와 결함 핵연료봉의 수를 관계짓는 방정식의 계수들을 결정한다. 핵분열생성물의 거동은 이탈(knock out)과 이동(migration) 두 부분으로 나누어 해석하였으며 트램프 우라늄의 영향을 분리할 수 있도록 하였다. 실측자료로는 가압 경수형 원자로인 고리 원자력발전소 1호기의 1차 냉각재를 분석해서 얻은 I-131과 I-133의 방사능 강도를 이용하였다. 이 실험자료와 위 방정식에서 구한 방사능 강도로부터 구한 결함 핵연료의 수는 제3주기에서 9.34±1.13개 제6주기에서 0.294±0.092개로 나타났다. An improved mothod of assessing fuel status by analyzsis of the fission product in the reactor coolant system is proposed. The release mechanism of specific fission products is established for determination of the coefficients in the equations which relate the radioactivities with the amount of detected fuel. Knock-out and migration models are employed in the formulation of the release mechanism. The influence of the tramp uranium is quantified. Sample calculations were made for KNU 1 reactor system using the I-131 and I-133 concentrations in the primary coolant. The estimated number of defected fuel pins in the third and sixth cycles appeared to be 9.34±1.13 and 0.294±0.092, respectively.

WMT를 이용한 인터넷 방송국 구축

김홍식,이영진,조재영,주영훈,박주연,송선아 인제대학교 기초과학연구소 2000 자연과학 Vol.4 No.-

WMT(Windosw Media Technologies)는 Microsoft에서 만든 인터넷 또는 인트라넷상에서 고품질의 오디오/비디오를 실시간으로 전송하여 주는 멀티미디어 스트리밍 기술이다. WMT는 대부분의 로컬 및 스트리밍 멀티미디어 파일 형식을 지원하기 때문에 개발자들은 어떤 웹 어플리케이션이나 사이트에라도 오디오와 비디오 방송을 구축할 수 있다. WMT에 포함된 Windows Media Encoder, Windows Media On Demand Producer등을 이용하고 전용서버를 설치하여 on-Demand방송이나 실시간 인터넷 방송을 구축할 수 있다. WMT is the multimedia streaming technology which transfer the audio and video on Internet or Intranet. Because WMT supports almost styles of local and streaming multimedia file, some developers build the radio and video broadcasting system at any web applications and sites. This paper shows the method of develop the realtime internet broadcastion system with WMT.

발프로산나트륨과 페니토인과의 약물상호작용

최준식,유재신,박용채,이진환 朝鮮大學校 1997 藥學硏究誌 Vol.18 No.2

This study was attempted to investigate the pharmacokinetic interaction between sodium valproate (4. 8. 16 ㎎/㎏. i.v.) and phenytoin (4 ㎎/㎏. i.v) in rabbits. The plasma concentration and area under the curve (AUC) of phenytoin were increased significantly (p<0.05. p<0.01) when coadministered with sodium valproate (4. 8. 16 ㎎/㎏) in rabbits. The volume of distribution and total body clearance of phenytoin were decreased significantly (p<0.05. p<0.01) when coadministered with sodium valproate (8. 16 ㎎/㎏) in rabbit. From the results of this experiment. it is desirable that dosage regimen of phenytoin should be adjusted and therapeutic drug monitoring should be performed for reduction of side or toxic effect when phenytoin will be coadministered with sodium valproate in clinical use.

L-Moment 법을 이용한 지점가뭄빈도 해석

유재성,강인식,박준일,신형우 慶尙大學校生産技術硏究所 1999 生産技術硏究所論文集 Vol.15 No.-

In this research, the drought analysis was derived with monthly rainfall data from 59 stations from the Korea meteorological Administration. the point frequency analysis was derived with L-moment's method and indicated the fitted probability distribution for 59 points. also estimating the probability drought rainfall of the duration(4, 6, 8, 10, 12 months) and return period(2, 5, 10, 20, 50, 100 years). Thus, indicated probability drought rainfall frequency figure for whole area of country.

Van der Woude 증후군 1예

최홍식,임재열,박준호,남지인 대한이비인후과학회 2001 대한이비인후과학회지 두경부외과학 Vol.44 No.11

연강우량 자료를 이용한 수문시계열의 특성 분석

유재성,강인식,박준일,신형우 慶尙大學校生産技術硏究所 1999 生産技術硏究所論文集 Vol.15 No.-

As the water resources planning is work out, it should have stationarity and randomness to be used hydrological time series data for frequency analysis or modeling which are kinds of probability analysis. But, in the case of domestic, we assume that the hydrological time series data is stationarity but, is not randomness, so it is usual to work out the hydrological analysis. Therefore, as a result, we can not be eliminate the possibility that the hydrological analysis brings about distorted results. Accordingly, in this research, to analysis the properties of hydrological time series data, the trend test, stationary and randomness test were used. The summary of results is as below. Result of the properties of hydrological time series data, in most of the points, the tendency is not indicated, the time series was revealed as randomness which does not have hydrological persistence as definitely stationary. But, from data of yearly rainfall, points for Taegwallyong, Ullungdo, both nonstationarity and persistence were indicated.