우리나라 中小企業에 對한 考察

宋甲鏞 광운대학교 1972 論文集 Vol.2 No.-

The small and medium enterprises of Korea (manufacturing industry) market relatively an increasing growth rate during the last 1960s which represented the decade of the successful accomplishment of the First and Second Five-Years Economic Development Plans. Analyzed in a strict sense, however the ratio of medium enterprise on the industrial structure turns out to be on the trend of diminishing in comparison with that of the large-scale industries expanded drastically n number or productive capacity. This tendency is expected to continue in the latter half of 1970s. Moreover, under the current domestic and external situations characterized by the export-oriented industrializing policies, we have experienced many subsidiary ill-effects due to the enforcement of development plans and the maintenance of the protective trade policy on the part of developed countries. In this regards, the performance of the industrial rationalization measures must be inevitably realized to cope with these difficult situations. Our government has taken a strong action for it since the financial measures on August 3 in 1973. In accordance with these circumstances, the small and medium enterprises recognized originally as weak condition themselves are for seen to take a great influence by them, revealing the characteristics of the rising and falling firms I 1970. I intended to refer to some ways of fostering our small and medium enterprises, completing research on the actual condition of them on the basis of their production history and statistical date.

우리나라 電子工業 育成方向에 對한 硏究

田秀一,宋甲鎔 光云大學校 1974 論文集 Vol.3 No.-

The present century is characterized by the Electronic Age indebted to the remarkable advancement of the electronic technique and the enlargement of its application sphere from our daily life to the space development especially since World War Ⅱ. In a word, the electronic industry is regarded as the labor and brain-intensive industry which has ahigher additional value than anything else. It was the latter half of 1960s that the newest technique-integrated industry has come before footlights in Korea. The advanced nations in electronic industry are willingly to render oversea investments to the under-developed, or the developing countries which have inexpensive and abundant man power. As a result of this tendency, the electonic industries in all over the world are on the trend of international division of labors, and in proportion to the advancement of electronic skill, the extent of the division of labor will be great as much in future. Considering a characteristics of the electronic industry and its contribution to the national economic growth, our country is obviously proved to have various beneficial and pertinent situations as far as electronic industries are concerned. In this context, our country has nominated the electronic goods as a strategic export oriented industry since the beginning of 1970s, and established a long-term planning for developing of the electronic industries of Korea, making great strides with strenuous efforts for the planned task that the electronic department only must occupy 250 million dollars among the amount of total export goal, 10billion dollars in the year of 1980. Having attempted to make a general survey on the present state of the electronic industries in Korea, we suggested a dissenting opinion to the Koreanized concept of the raw materials which are constructed to coincide with accessory parts or intermediate manufactured goods. It is attributable to the fact that the electronic kernel skill of Korea remains so far at the low level. We think the current concept of the raw materials will have to be changed according to the development of the electronic technique in the near future. On touched on the present condition of the production and employment structure, the export-import system, and in addition, the inducement of foreign capital and technique, including the trend of international market for electronic manufactured goods. In this thesis, we are greatly interested in examining and analyzing our gevernment policies on the basis of the theory of economics, which practised so far according to the long-term electronic industry development planning. Above all, the emphasis is placed on finding out the urgent problems and their possible plans disclosed as a result of this study. The most important task to be inevitably accomplished by the end of 1970s is to proceed on the stage to make electronic machinery and tools for industrial world, which have the highest additional value, passing from the current production stage of accessory parts or electronic manufactured goods for family use. In addition to the enhancement of the electronic technical standard, we must take into consideration to expand international export markets by means of the application of Korean native design to all the export-oriented goods and so on. To sum up, it is timely and properly estimated that our goverment nominated the electronic industry as a strategic export-oriented industry and the government measures executed in compliance with the long term development planning. It is also desired to carry out the measures for promoting electronic industries by the government initiative, for the time being. In proportion to this, the fulfilment of administrative responsibility for it will be strongly required. At the same time, we proposed to establish a synthetic research center in charge of driving harmoniously man power planning for supply and demand, development researches by means of the industry- education cooperation.

석재(石材) 가공(加工)시 발생한 석분(石粉)이 혼합된 콘크리트의 압축강도(壓縮强度) 특성(特性)에 관한 연구

채영석,민인기,송갑용,Chae, Young-Suk,Min, In-Ki,Song, Gab-Young 한국자원리싸이클링학회 2009 資源 리싸이클링 Vol.18 No.6

석재 가공 시 발생되는 석분은 산업폐기물로 되어있다. 현재 이 석분은 지하에 매립하거나 지상에 야적되어 방치되고 있어 폐기물로 처리하는 데 많은 비용이 요구되고 있고, 토질과 지하수 등의 환경오염의 원인이 되고 있다. 또한 콘크리트의 주재료인 골재의 공급이 부족한 현실을 고려하여 본 연구에서는 폐석분을 콘크리트 혼화재료로 재활용할 수 있는 가능성을 연구하고자 한다. 석분함유량에 대한 시멘트비를 조정한 결과, $20{\sim}30\;N/mm^2$의 콘크리트의 압축강도가 나타났고 이는 석분의 함유에 따라 압축강도가 감소되지 않음을 알 수 있었다. 석재 가공 시 발생되는 석분을 콘크리트 혼화재료로 재순환하여 사용하여도 콘크리트의 압축강도에는 전혀 문제가 없음을 알 수 있었다. The stone dusts produced during the manufacturing process of stone blocks are considered as one of industrial waste materials. This stone dusts are managed to either burying under the ground or stacking in the yard, but this disposal process is required an extra costs. The stone dust disposal like burying or stacking also cause environmental pollution such as ground pollution and subterranean water pollution. Thus, this study was conducted to explore the possibility of recycling stone dusts as a concrete mixing material in order to extend recycling methods. Based on the experiment results on various ratios of cement to stone dust content, the compressive strengths of concrete were recorded in the range of $20{\sim}30\;N/mm^2$. The results did not show any decrease in compressive strength due to the stone dust content. It can be concluded that the stone dusts produced by stone block manufacturing can be sufficiently recycled as one of concrete mixing materials in the aspect of compressive strength.

석재가공시 발생한 석분 함유량에 따른 콘크리트 압축강도 특성

정진섭 ( Jeong Jin Seob ),송갑용 ( Song Gab Young ),박승해 ( Park Seung Hae ) 한국농공학회 2006 한국농공학회 학술대회초록집 Vol.2006 No.-

The stone dusts produced during the manufacturing process of stone blocks are considered as one of industrial waste materials. This stone dusts managed to either burying under the ground or stacking in the yard, but this disposal process is required an extra costs. The stone dust disposal processes like burying or stacking also cause environmental pollution such as ground pollution and subterranean water pollution contamination. Thus, this study was conducted to explore the possibility of recycling stone dusts as a concrete mixing material in order to find out more recycling methods and to solve the shortage of aggregate caused by recently increased demand in construction. Based on the experiment results on various ratios of cement to stone dust content, the compressive strengths of concrete were recorded in the range of 20∼30N/mm2. The results did not show any decrease in compressive strength due to the stone dust content. It can be concluded that the stone dusts produced by stone block manufacturing can be sufficiently recycled as one of concrete mixing materials.

석재가공에서 발생한 석분슬러지의 아스팔트 콘크리트 채움재로의 활용

정진섭(Jeong Jin Seob),송갑용(Song Gab Young),안정현(Ahn Jeong Hyeon),김태형(Kim Tae Hyung) 대한토목학회 2007 대한토목학회논문집 D Vol.27 No.4D

본 논문에서는 석분슬러지의 처리 문제와 비용 절감을 위해 아스팔트 콘크리트 채움재로서 활용 가능성을 검토되었다. 석분슬러지의 아스팔트 콘크리트 채움재 활용함에 있어 품질 기준을 확인 하고 품질 평가를 통해 적합성 여부를 판단하였다. 일반적으로 석분은 Ouartz, Feldspar, Muscolinite, Kaolinite, Calcite의 5가지 광물 성분으로 되어 있으며, 실험 결과, 본 연구에 사용된 익산시 황등 석분은 SIO₂가 55.68% AL₂O₃, 19.63%, FeO가 2.38%이며, 기타 미량의 광물질을 함유하고 있다. 입도, 소성지수, 흐름시험, 침수 팽창 등 채움재의 품질 기준을 만족하는 것으로 나타났다. 석분슬러지를 활용한 아스팔트 콘크리트의 마샬안정도를 측정한 결과 기층용에서는 기준배합(석분슬러지:아스팔트, 0%:4%)에서 석분슬러지를 4%로 늘이고, 아스팔트 함량을 0.4% 줄인 3.6%에서 높은 마샬안정도를 보였고 표층용에서는 기준배합(채움재:아스팔트, 2%:5.4%)에서 채움재를 석분슬러지 4%로 대체하고 아스팔트 0.2% 줄여도 마살안정도에 큰 변화가 없이 만족스러운 결과가 나왔다. 한편, 폐기물 용출시험을 실시한 결과 유해물질은 유출되지 않았다. 이상의 결과를 바탕으로 폐기물로 인식되는 석분슬러지를 아스팔트 콘크리트 채움재로 활용한다면 아스팔트 콘크리트의 생산단가 절감과 더불어 상당한 비용을 들여 위탁처리하고 있는 석분슬러지의 폐자원 재활용 측면에서 매우 의미가 클 것이다. This study was conducted to explore the possibility of recycling of waste stone dust sludges as a asphalt concrete filler. The stone dust sludges used in this study consist of 55.68% of SIO₂, 19.63% of AL₂O₃, 2.38% of FeO, and the other minor minerals. Through experiments such as plasticity index, flow test, rate of expansion under water striping resistance, it was found that the stone dust sludges were satisfied with the quality specification of filler. Marshall stability tests on the asphalt concrete containing stone dust sludges showed that the highest Marshall stability values were obtained in case of mixing 4% of stone dust sludges with 3.6% of asphalt for base and in case of mixing 4% of stone dust sludges with 5.2% of asphalt for surface, respectively. These results indicate that the content of asphalt can be reduced by 0.4% for base and 0.2% for surface compared with the standard mixing design. Based on the leaching tests, in addition, only a small amount of lead below the standard level was leached, and no other harmful substances were leached. From this study, the stone dust sludges can be used as a filler for asphalt concrete mixtures, and it makes reducing the production costs of asphalt concrete and also decreases the disposal costs of waste stone dust sludge.

비빔시간에 따른 고강도 프리캐스트 콘크리트의 물리적 특성에 관한 기초적 연구

최훈국(Choi, Hun Gug),이한용(Lee, Han Yong),윤섭(Yoon, Seob),송갑용(Song, Gab Young),정용(Jeong, Yong) 한국콘크리트학회 2014 한국콘크리트학회 학술대회 논문집 Vol.2014 No.10