건강보험에서의 보험회사 역할 확대방안

박홍민,김경환 보험연구원 2001 연구보고서 Vol.2001 No.9

덕온鑛山의 母岩의 力學的性質에 關한 硏究

朴洪民,金永錫,金昇坤,金溢中 全北大學校 1982 論文集 Vol.24 No.-

This study was performed for the purpose of the physical and mechanical properties of Rhyolite, Andesite, Granite-gneiss, Quartz-porphyry, in Deogon mine. The main results obtained were as follows ; (1) The angle of internal friction and the brittleness of samples were proportioned to the ratio of compressive strength to Brazillian tensile strength. (2) The shear strength by the equation (3-3-2) was nearly equal to that on the common tangent line of Mohr's circle. (3) The stress-volumetric strain curves of all samples were divided into three stages ; the preexisting cracks were clossed at the first stage(Ⅰ), the linear elastic deformation occurred because of frictional sliding on crack face at the second stage (Ⅱ), the micro-crack was started in the sample at the third stage (Ⅲ). and the lateral strain was greater that the axial strain at the failure stage of the sample. (4) The lowering ratio of Brazilian tensile strength for dry state and saturation state of samples were high in the following order ; Quartz-porphyry, Andesite, Rhyolite, Granite-gneiss. (5) The normal stress acting on failure plane was proportioned to the compressive strength. (6) The store energy was proportioned to the strain energy.

花崗岩 採石의 經驗則와 花崗岩의 力學的 性質

박홍민,이상은 全北大學校 1992 論文集 Vol.34 No.-

Granites contain many micro-defects which oriented preferentially along with the direction of three crossed surface such as rift plane, grain plane and hardway plane. These micro-defects affect on the physical properties of the granite. Quarryman use the micro-defects structure which is called "Kyeol" in quarring the granite. However, this method is not established neither scientifically nor theoretically. Therefore, this study was performed to establish basic theory of the granite quarring from empirical function of the quarryman. For this purpose, the granite is sampled from Iksan(Hamyeol) and Jinan(Yongdam). In the three directions of "Kyeol", p-wave velocity(Vp) and tensile strength (σt) was measured every ten degree in the diametric direction and the preferred orientation of micro-defects was observed through the poralized microscope with the thin section. The results are summerized as follows. 1) P-wave velocity and tensile strength of rift plane, grain plane and hardway plane while there was a diference to some degree indicates in order of R. G and H plane commonly, and show the harmony vibration of the 180° cycle. 2) Three dimensional Vp and σt presume in the form of anisotropy cross at right angles. 3) In the observation of defect structure, cracks which grow parallel to each plane were confirmed. Depend on the degree of these cracks anisotropy of granite recognized.

效果的 坑內運搬의 改善方案 : 디젤기관을 도입시킨 경우(第1報) In a Case of Using a Diesels(1st Report)

朴洪民,金永錫 전북대학교 공업기술연구소 1979 工學硏究 Vol.9 No.-

The authors have a summarized of the characteristics of underground diesel equipments that are widely used today. The authors have a summarized of the characteristics of underground diesel equipments that are widely used today. 1. The recent rapid increase in the use of diesels underground has been the result of three important advantages offered by diesel power safety, flexibility and economy. 2. The diesel exhaust is cleaner than an automobile in terms of toxic gases. Fumes from explosives used in mining methods can be several times more dagerous than diesel exchaust. 3. It is clear that all the gaseous pollutants in a diesel engine exhaust can be diluted to well within safe exposure limits by a relatively low ventilating air current. 4. Practical experience and currently available medical data indicate there is no significant hazard associated with the gaseous toxicants. 5. A Permissible diesel can operate quite safely in relatively high concentration of methane gas than any other piece of mobile machinery currently used in gassy coal mines. 6. The safety features in most current equipment make diesels even safer than in the past and statics shows diesel have been safer that electrical equipment. 7. The combination of catalytic scrubber and new cyclonic water scrubber in series will go a long way in reducing the potential hazards associated with the carbon monoxide, unburned hydro-carbons and particulate matter in diesel exhausts. 8. The Bureau of Mines and MESA continue to collect date relevant to the use of diesels undergrouds, so more precise information on ventilation requirements and operational procedures can be developed. It should be possible to introduce suitable regulations to govern the construction and operation of diesel equipment underground.

坑內作業에서의 發塵量과 抑制對策 (1)

朴洪民 全北大學校 1966 論文集 Vol.7 No.-

萬德山 및 天壺山 一帶의 石灰岩 調査報告

朴洪民,南基庠,金永錫 全北大學校 1969 論文集 Vol.11 No.-

The writers have investigated the limestone which is reserved in Mt. Manduk and Mt. Chunho. The geographic coordinate of Mt. Manduk is about N. latitude 35°47'-35°49' and E. longitude 127°13'40"-127°17'50", that of Mt. Chungo is about N. latitude 36°2'30" and E. longitude 127°7'. The main purpose of this investigation is to find geological structure and industrial mineral. Geology of around Mt. Manduk consists chiefly of Manduksan formation of Cretaceous and Quaternary. The most limestone is reserved in Manduksan formation, a few limestone dyke is reserved in between schistose granite and Manduksan formation, and that of Mt. Chungo consists of schist group(Muscovite, Biotite schist group) and limestone of Cretaceous.

韓國無煙炭의 炭化度와 水分

朴洪民,金溢中 全北大學校 附設 都市및環境硏究所 1987 都市 및 環境硏究 Vol.2 No.-

The moisture contents of anthracites are larger and more variable than bituminous coals, and the relation between the degree of carbonization and moisture contents is so complicated that is not yet brought to light. We investigated the moisture contents of some Korean anthracites and considered the connection of the moisture content with the unit specific gravity, fuel ratio and ash content.

高溫岩石의 熱的 性質에 關한 硏究

朴洪民,金永錫,金昇坤 全北大學校 1979 論文集 Vol.21 No.-

Rock specimens were heated up to 1,300℃ at the rate of 50℃/10min. Photographs were taken at every 200℃ to observe the change of rock texture and following results were obtained. 1. Cracks were developed at 600℃ for granite and at 800℃ for limestone, while slight cracks were observed at 1,000℃ for sandstone, gneiss and shale. 2. The temperature at which rocks begin to melt was different depend on the kind of rocks, But all rocks were melted at 1,200℃. 3. Rock specimens were heated up to 1,300℃. It was found that gneiss and shale melted completely and changed to glass state at surface, while limestone changed to powder and granite retained its original form.

Wide Space 發破의 最適 破碎 機構에 關하여

朴洪民,李相恩 全北大學校 1994 論文集 Vol.37 No.-

This study is performed to know the blasting mechanism and optimum fragmentation by the variation of the ratio of spacing and burden(S/W) and breaking areas(S×W) in Alter-nate Multi-row Hide Space hole pattern. For the experiments, cement mortar specimens are used. The results are summarized as follows ; ① The optimum spacing to burden ratio to get the best fragmentation depends on the blast- ing area(burden×spacing) when concentration of charge is kept constant. ② The reduction of burden increases the cracking by reflected tensile stress wave. ③ Wide space hole pattern causes effective full crack development with less cut-off by the cracks of previous round.

Slurry 爆藥에 關하여

朴洪民 全北大學校 1977 論文集 Vol.19 No.-

Slurry explososives were developed by M. A. Cook in 1943 and became produced as industrial explosives in Canada. At the first stage explosives such as TNT was used as one of the components but later explosives was not used as a component. At last the development of cap-sensitive slurry explosives made dynamite absolate gradually. User must pay much attention to improve blast characteristics and maker must further research and develop technical characteristics in order to be used more economically than dynamites. Cooporation between maker and user of slurry explosives will improve the quality of the slurry explosives and it replace hazardous dynamites so that worse environment will be greatly improved.