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混和劑에 依한 흙·시멘트 龜裂防止 效果에 對한 硏究 (Ⅱ)
尹載殖 全北大學校 1980 論文集 Vol.22 No.-
There are various causes of crack in the Soil-Cement which has been stable handling. But, among them, the cause of drying-contraction which was happened by the hydraulic operation of cement comes to the greatest effect. This study is the test to reduce the degree of the drying-contraction using the Admixing-Agent. The Admixing-Agents used in this testing are lime and Fly-Ash. Making the molds, the writer experiments the degree of drying-contraction in a laboratory.
윤재홍,송한식,권치명,정문상 東亞大學校 經營問題硏究所 1994 經營論叢 Vol.15 No.-
This paper is concerned with a lean production system to improve the productivity of shoes manufacturing industries. For this purpose, this research first reviews the environmental characteristics of shoes manufacturing industries and invetigates the current problems of shoes production systems. Shoes manufacturing process roughly consists of three process lines shoes uppers line, shoes soles line, and assembling line of shoes uppers and soles. Two major problems in shoes production system are a large amount of work-in-process(WIP) inventories, and the low rate of matching shoes uppers and soles in an assemblying line. Most of shoes manufacturing companies have more than a 3-days WIP inventories in every process line to avoid the blocking the production. Particularly the assemblying line has 5-7days buffers of shoes uppers and soles to maximize the productivity of manufacturing final shoes, however, the matching rate of shoes uppers and soles in the assemblying line is about 50%. These problems are from a low efficiency in inventory control mainly due to (1) too many order specification of sizes, colours, types and different due dates, and (2) a large amount of WIP inventories. To reslove above mentioned problems, we sugggest a lean production system of pull-method for reduction of WIP inventories and improvement of matching rate of shoes uppers and soles in assemblying line. Compared to a push production system(current production system), a pull production system may have a number of adventages in controlling inventories and balanced match of the sole parts and uppers parts when it applied to shoes manufacturing process. As an alternative to control the pull production method, we design a Kaban for production and inventory control. Also we design the Kaban circulations model for the production lines and inventory stores, and a shoes manufacturing information system to incorporate the Kaban system. We expect that the effective adoption of the pull production system to shoes manufacturing system will show better results in improving the matching rate, and reducing the WIP inventories and production lead time. These effects may also give more flexible production planning and raw matiarial procurement planning. We finally consider this research would be helpful in designing the lean shoes production system
栽培中 Tomato 果實의 窒酸鹽 및 亞窒酸鹽과 Ascorbic acid의 含量變化
尹衡植,申大休,崔載春,權重浩 慶北大學校 1982 論文集 Vol.33 No.-
This experiment was carried cut to investigate the relationship between nitrite and ascorbic acid contents in two kinds of tomato fruits namely, Bokwang, Suekwang, which were different distinguished in growth periods during culture. The results obtained were as follows. The nitrate content in two kinds of tomato fruits was relatively higher in Bokwang than Suekwang. It indicated high content as 5.8-12.5 ppm in flesh and 0.3-2.5 ppm in gelatinous pulp. In the beginning of growth period, nitrate content in flesh was 50-62.5ppm, and in the latter period was 21.3-38.4ppm. In the case of gelatinous pulp, it was decreased from 14.0-16.2ppm in the beginnig period to 9.3-10.7ppm in the latter period. In the case of nitite, there was no difference between two varieties. Nitrite content during growth increased from 0.15ppm to 0.21ppm in flesh and from 0.06ppm to 0.1ppm in gelatinous pulp. There was no difference between two varieties during growth in total ascorbic acid content and its concentration was 24.2-27.5mg in gelatinous pulp and was 13.8-18.6mg in flesh. The difference between two parts was about 10mg. In the changes of nitrate and nitrite content in tomato fruits, nitrate was decreased, whereas nitrite content was increased. In the changes of nitrate and ascorbic acid content in tomato fruits, nitrate content was decreased but that of ascorbic acid was increased slightly. In the changes of nitrite and ascorbic acid content in tomato fruits, nitrite content was increased and that of ascorbic acid was slightly increased too.
중량물 운반시 잡기유형과 부하단계에 따른 생리학적 연구
윤양진,이훈식,윤길환,정미라,이재규,이중숙,서국웅 釜山大學校 附設 體育科學硏究所 1999 體育科學硏究所 論文集 Vol.15 No.-
The purpose of this study was to examine physiological changes of the body according to various weight loads and the holding during carrying object. The experiments were conducted with utilizing physiological analyses for five male and five female adults as subjects. The results were as followed. 1. Any significant difference was not shown in heart rate, ventilation and amount of oxygen uptake of male subjects in the case of no load and 5kg. And also no significant difference was shown in expiratory exchange ratio of male subjects of no load, 5kg and 10kg, but in other measure items and other stages of weight was shown. 2. Significant differences were shown in heart rate, ventilation, defluxion of carbon dioxide, oxygen uptake per body weights, respiratory exchange rate, respiration rate and all other measure items of female subjects in all stages of load. 3. In the MMH job, there was no influence on male subjects up to 5kg loads, but there was an significant difference in male subjects in load walking from 5kg. It shows that even in 5kg weight MMH work, female subject's expiratory function was influenced. 4. 10kg load was the limit weight of female subjects and 15kg was of male subjects when they walked on treadmills with 4km/h velocity for 3 minutes, holding loads in the right and vertical types.
한국과 중국의 중학교 지리교과에서의 환경교육 비교 연구
최운식,윤재옥 이화여자대학교 사범대학 교과교육연구소 2002 교과교육학연구 Vol.6 No.2
본 연구는 우리나라의 중국의 지리교과서를 대상으로 양국의 환경교육을 비교 연구하고자 하였다. 연구의 범위는 양국의 중학교 지리(사회) 교과서를 중심으로 환경교육이 어떻게 이루어지고 있는지를 알아보기 위해 세계지리 영역에 국한하였다. 연구 결과, 한국이 중국보다 균형 있게 환경교육을 실시하고 있었으나, 내용이나 활도 모두 환경문제 해결에 부족한 것이 많았음을 알 수 있다. 보다 낳은 환경교육의 역할을 다하기 위해 우선적으로 노력해야할 사항들을 몇 가지 제안하면 다음과 같다. 첫째, 지리교과에 맞는 환경교육 분석틀을 새롭게 구성하여, 이 영역에 대한 중점 교육이 이루어져야 한다. 둘째, 환경교육의 기본이라 할 수 있는 올바른 환경관 정립 교육과, 오늘날 환경교육의 가장 대표적 추세인 ESSD교육과 같은 현실성 있는 교육이 보다 강조되어야 한다. 셋째, 보다 실제적인 화나경교육이 되기 위해 활동중심의 교육으로의 전환이 필요하며, 답사 등의 현장 교육이 더해져야 할 것으로 보인다. This study attempts to find out the characteristics of geography education and enviroment education and to analyze the environment subjects in middle school georaphy texts in Korea and China. For the purpose, world geography section in social studies 1 in Korea and middle school geography texts in China are collected. The data are analyzed loith comparctive methods. The results may be summarized as follows. Firstly, Korea and China have the similar level of environmental education in contents. China leans to activities related to population, industrializaion, unbanization and various resources, while Korea covers all sorts of field. Secondly, Korea has more balanced and systematic environmental education through geography class. Researcher suggest the following things based on this research to make more desirable environmental education in geography. Firstly, the teching frame for geography should be constructed newly and more proctically. Secondly, we must emphasize on ESSD.