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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.
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.
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
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.
海砂 混合率 變化에 따른 水中不分離性 콘크리트의 特性에 관한 硏究
김명식,윤재범,김광민,이상명 釜慶大學校 1999 釜慶大學校 論文集 Vol.4 No.1
The objective of this study is to investigate the characteristics change of antiwashout underwater concrete with variation of blen ratio of sea sand to total fine aggregates through experimental studies. The flowability(slump flow test), antiwashout properties(pH and suspension test), filling property(box test), air and chloride contents property, and the unit weight and the compressive strength of both cast-in-fresh water and cast-in-sea water have been examined experimentally. According to the experimental results, when sea sand are mixed in antiwashout underwater concrete mixture by about 40% per total fine aggregates, it is found that the flowability fit and the compressive strength is higher than others.