대학교 대형강의실의 조명조건별 조명환경평가

최윤정,이상운,조현주 충북대학교 교육 ·생활연구소 생활과학연구센터 2003 생활과학연구논총 Vol.7 No.1

The purposes of this study are to evaluate the lighting environment of a university assembly hall and to make clear the problems of conditions of lighting operation. The field measurement on the illumination level and the questionnaire survey on subject response of the lighting environment with students were carried out at an assembly hall in C university, Cheongju. These survey were taken on 4th and 9th of December, 2002. The illumination levels of the assembly hall in the condition A (157∼403 lux) were lower than standard (400lux). The illumination levels of the condition B (16∼372 lux) and condition C (0∼1 lux) were poor. The illumination levels of the condition D (231∼510 lux) were somewhat lower than standard. It was found that the present condition of the lighting environment of the university assembly hall is inappropriate illumination level and uniformity for lecture.

고속스위칭회로설계시 분석용등가회로의 타당성 검토

최성운 영남이공대학 2000 論文集 Vol.29 No.-

Recently, the design of the electronics circuits nearly on the basis of the computer simulation using CAD. This paper is propriety investigation of analysis equivalent circuits depend on these methods at a design for the high speed switching circuits. Ordinarily, the bypass capacitor insert nearly power source and devices at construction of circuits by way of precaution against EMC. If we only consider capacitor in time consist of a equivalent circuits, it is true at the region of lower frequency, but the impedance became larger owing to the occurrence of self resonant with inductance of capacitor lead. Therefore the noise effect is reduction. Also, the concurrent switching noise has come out at the high speed switching circuits. Such noise has decreased by using bypass capacitor at the output stage of an each gates. But when one gate is operation, these circuits occurrence to the voltage proportion to the inductance L of the IC pin and package pin because the current flows at GND pin. Therefore the GND potential at chip with 0V is occurrence to changing GND bounce equal to ΔV. This is become to large value because of the GND current flow at the same timing. In the worst case, the output of accummulation gate occurrence to error operation run over the threshold value. Finally, when we has design of the high speed switching circuits, the computer simulation analysis on the basis of the equivalent circuits exception to inductance component of the device and package are indicate to occurrence of a huge mistake. Natually, the data sheet is not furnish on these inductance value. If we has construct a correctness equivalent circuits, we will be include to till of the conductibilibity noise of between power and system, noise of the multilayor PCB, mutuality interference, space radiation electromagnetic noise, static electricity, natural noise the like of lightning.

참깨의 脂質變化에 關한 硏究 : 第2報. 貯藏中 一般成分 및 脂肪酸 組成 變化 2. Changes in General Components and Fatty Acid Compositions during the Storage

崔相道,趙鏞雲 진주산업대학교 1983 論文集 Vol.21 No.-

참깨를 明所에서 通氣貯藏(LA), 明所에서 密封貯藏(LS), 暗所에서 通氣貯藏(DA)과 暗所에서 密封貯藏(DS)하면서 참깨 收穫直後부터 4個月, 9個月과 15個月마다 참깨의 一般成分과 脂肪酸組成을 分析한 結果는 다음과 같다. 1. 粗脂肪은 모든 貯藏條件에서 期間이 길수록 減少하였고 그外 一般成分은 一定한 傾向이 없었다. 2. 飽和脂肪酸인 palmitic acid 와 stearic acid 는 貯藏期間이 길수록 減少하였고 不飽和脂肪酸인 linoleic acid 貯藏 4個月부터 9個月까지는 急激히 增加하였고 그 以後는 거의 變化가 없었다. 3. 以上의 結果에 따르면 참깨는 적어도 9個月 以上 貯藏하여 採油하는 것이 營養的인 見地에서 良質의 참기름을 얻은 수 있다. In order to examine the effect of storage conditions on the general components and the fatty acid compositions of sesame seeds. The general components and the fatty acid compositions were analyzed during the storage of sesame seed for 4, 9, and 15 months at the four different storage conditions, that is, storage under light in linen pouch(LA), storage in dark in linen pouch(DA), storage under light in vinyl pouch(LS), and storage in dark in vinyl pouch(DS). The results obtained are summarized as follows; 1. The amounts of crude oil was decreased during the storage in all the storage conditions, but another general components were not shown a regular tendency. 2. The content of palmitic acid and stearic acid in total lipid were decreased during the storage with prolonged time of shortage, but linoleic acid content was increased during the storage, between 4 to 9 months, then the content was continued with the same value until 15 months of the storage. 3. Juged from above results in terms of nutritional value of unsaturated fatty acid, it is recommendable to extract oil from sesame seed stored for more than 9 months after harvesting.

Switched Capacitor LPF의 일 구성법과 대역외 잡음억제에 관한 고제

최성운 영남이공대학 1982 論文集 Vol.11 No.-

The purpose of this paper is to realize Biquard type SC LPF by applying the principle of Switched Capacitor to Biquard type Active LPF, and the results were obtained through experiment as follows: (1) Using 3 Capacitors, the Switch divided the charge accumulated in them one after another, and large equivalent registor was realized. By making use of them, SC integrator with large time constant was also made. (2) Through practical measurement of the realized Biquard type SC LPF, using the above mentioned circuit, LPF of cut-off frequency 100Hz was made. (3) In the frequency over 6.4kHz, which is half a clock frequency (fc-12.8 kHz), low level noise component peak was generated because of the frequency Iimit of OP AMP. The peak could be suppressed to the degree of -36dB, which resulted from the connection of the input terminal in the realized circuit with RC Buffer Filter.

전력선 잡음특성과 이 잡음이 통신시스템에 미치는 영향에 대한 고찰

최성운 영남이공대학 1998 論文集 Vol.27 No.-

Noise measurements for various electric appliances used in an ordinary home are made Statistical values of noise amplitudes, noise duration, intervals of noise occurrences for these appliances are obtained. All measured noise takes the font of the burst impulsive noise. This paper analized these noise characteristics and Effects of these noise on an ordinary data transmission system am studied. The error apperance in digital signal transmission methodes are determined according to burst noise interval and information transmission speed.

위암에서 장화생 발생 양상에 대한 연구

최은정,강상균,김창진 순천향대학교 1994 논문집 Vol.17 No.4

The pathogenic mechanisms of gastric carcinoma, which is the most common malignant tumor in Korea, have not been completely revealed, but several lines of evidence suggest that intestinal metaplasia contributes in some way to the gastric carcinogenesis. Histologically, the gastric carcinoma can be classified into two main types, the expanding type and the infiltrative type. Intestinal metaplasia can be classified into 3 types : type Ⅰ which is complete metaplasia, type Ⅱ and type Ⅲ which are incomplete metaplasia secreting sulphomucin. The expanding type has some correlations with incomplete sulphomucin secreting metaplasia. To investigate the relationship between patterns of intestinal metaplasia, especially sulphomucin producing metaplasia, and histologic types of gastric carcinoma, 80 cases of gastric carcinoma and 10 cases of gastric ulcer were studied histochemically with hematoxylin-eosin, periodic acid-Schiff alcian blue(PAS-AB : pH2.5) and high iron diamine alcian blue (HID-AB : pH2.5) stains. The results were as follows : 1. Of a total of 80 cases of gastric carcinoma, 21 cases(26%) were expanding type and 59 cases(74%) were infiltrative type. 2. Of 21 cases of expanding type, 6 cases(28%), 4 cases(19%) and 5 cases(25%) were type Ⅰ, type Ⅱ and type Ⅲ intestinal, which is higher rate than that of nonsulphomucin secreting type Ⅰ intestinal metaplasia. 3. Of 59 cases of infiltrative type, 18 cases(30%), 8 cases(14%) and 12 cases(20%) were type Ⅰ, type Ⅱ and type Ⅲ intestinal metaplasia respectively. Twenty cases(34%) were sulphomucin secreting type Ⅱ and typeⅢ metaplasia, which is slightly higher rate than that of nonsulphomucin secreting type Ⅰ metaplasia. 4. Non-metaplasia was found in 28% of expanding type, and in 36% of infiltrative type, which suggests that, compared to the expanding type, infiltrative type tends to be associated with non-metaplasia 5. Of 10 cases of gastric ulcer, 6 cases(60%), 2 cases(20%) and 1 case(10%) were type Ⅰ, type Ⅱ and type Ⅲ intestinal metaplasia respectively. Above results suggest that sulphomucin secreting type Ⅱ and Ⅲ intestinal metaplasia have some relationship with gastric carcinogenesis, and that infiltrative type is more frequently associated with non-metaplasia, while non-tumorous gastric lesion as peptic ulcer has frequently associated with type Ⅰ complete intestinal metaplasia. However, further studies on the profiles of mucins secreted by epithelial cells should be done to elucidate the relationships between intestinal metaplasia and gastric carcinogenesis.

인터넷 환경상에서 의학정보시스템의 하이퍼미디어 설계

崔成雲,黃榮道 영남이공대학 1997 論文集 Vol.26 No.-

The designed demonstration in this study is a part of the heart to be a link of the circulation system of the body in the medical information. It represents the multimedia information on the three-dimensional and audio-visual display with the interlacing and streaming which is connected with the complex media part like the text, video, graphic, audio. animation et tetra with the hyperlink.

梅實酒(非醱酵性) 製造條件에 關한 試驗(Ⅵ)

趙鏞雲,崔相道 진주산업대학교 1983 論文集 Vol.21 No.-

梅實酒 製造時 浸漬條件 및 貯藏期間을 算定하기 위한 實驗으로 설탕을 첨가하지 아니한 것과 添加한 것, 희석 알코홀의 濃度別에 있어서 貯藏期間을 달리 하였을 때에 梅實酒 官能檢査를 實施하였다. 1. 설탕을 첨가한 경우가 첨가하지 않은 조건보다 좋게 나타났다. 2. 무가당일때는 대체로 180일 동안 저장한 경우가 양호하였다. 3. 가당인때는 90일, 180일에서 좋은 경향이었다. 4. 360일 저장의 경우, 30% 알코올로 20% 가당이 무가당보다 좋았고, 30% 알코올이 가장 기호성이 높았다. At Japanese apricot wine manufacture, we examined the Sensually evalution of its. Here, we would calculate for deposition condition and storage periods, it was operated, the storage period is different, in alcohol concentration variety(20%, 30%, 40% and 50%) which was added 20% sugar or not. 1. it was seemed that added­sugar condition was better than that of not. 2. As being non­sugar, it was good about 180 days for storage. 3. As being added­sugar, it was better 90 days or 180 days for storage than anytime. 4. A case of storage for 360 days, 30% alcohol and 20% sugar is better than non­sugar, and 30% alcohol is the highest tastes.

타이어 설계인자를 고려한 자동차의 조종 및 안정 특성에 관한 연구

윤성운,홍석주,최규남 朝鮮大學校 機械技術硏究所 2004 機械技術硏究 Vol.7 No.2

As the technique of automobile industry is being advanced, the advancement of performance for vehicle is being required. In order to achieve this purpose, the study on the handling and stability which are produced by moving vehicle is carried out actively. Ability to predict vehicle performance using computer simulation is essential to reducing the development time for tire companies as well as car makers. From the previous research. we showed that handling simulation tool developed for J-turn and lane change maneuvers on ADAMS could be used in predicting the performance difference among tires with different specifications in vehicle mild handling behaviors. Through this study, some meaningful correlations were achieved. Also barriers to direct application of the simulation technique to tire development process and several technical problems that should be resolved were iden tified. In this results, ability to predict vehicle performance using computer simulation is essential to reducing the development time for tire companies as well as car makers.

중 고등학교 수학교육 개선을 위한 연구

邊龍聖,金東碩,邊東壽,崔雲行,洪慶和,鄭寶鉉 弘益大學校 1991 弘大論叢 Vol.23 No.2

A great many students are working for their mathematics learning in secondary schools and nevertheless its learning effect is rather low. This phenomenon is largely due to a biased social recognition. Furthermore the educational environment including big class size and ability differences enlarge such a difficulty. This study aims at seeking an improving device to enhance learning efficiency under the circumstances. Questionaires about problem finding of teachers educational activity and mathematics teaching were distributed and collected. Data were analyzed to establish a desirable mathematics education and teaching. Devices for individualized instruction and learning tasks and evaluation methods were proposed. This recommendations are supposed to be an improving way for students' mathematics learning. In relation to this result, a further study is strongly required and adminstrative supports by government are badly needed to achieve such a goal.