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강신엽(Kang Shin Yeop),안재홍(Ahn Jae Hong),김주형(Kim Ju Hyung) 한국BIM학회 2013 KIBIM Magazine Vol.3 No.1
Mix-used development in urban renewal project is done to effectively utilize the limited downtown. Generally unlike a single project, It features placing a large number of different facilities(residential, commercial, business, cultural, etc.) which is each other organically linked. The purpose of this study is to suggest the method of modeling guide for 3D preliminary cost estimation considering visual and intuitive judgement of space in mix-used development Urban Renewal project. In this research, introducing SME(Standard Module and Element) breakdown structure, FID(Finish Identity) for estimating building space unit-based quantity take off was implemented. It could narrow the discrepancy of opinion between the stakeholders with more accurate cost-estimates, comparing to the traditional methods.
安龍得,姜信葉 충남대학교 농업과학연구소 1985 農業技術硏究報告 Vol.12 No.2
This study was performed to obtain the basic data which can be applied to the use of foamed mortars using foaming agent of prefoamed type. The data was based on the properties of foamed mortars depending upon various mixing ratios of cement to fine aggregates, flow values and foam-cement ratio to compare those of cement mortar. The results obtained were summarized as follow; 1. At the mixing ratio of 1 : 0 and the foam-cement ratio of 6.00%, the increasing rate of water-cement ratio was 25% by flow 200±5mm, 28% by flow 240±5mm and 32% by flow 280±5mm. But it decreased as the mixing ratio gets poorer. The result showed that water amount increased because of the high viscosity caused by the increase of foam. cement ratio. The decrease of water-cement ratio was the greatest when the foam-cement ratio was 1.50%. 2. Absolute aridity bulk density of foamed mortars decreased with the increase of foam-cement ratio and the decrease of flow values. 3. Generally, compressive, tensile and bending strenghs of foamed mortars decreased with the decrease of flow values and the increase of foam-cement ratio. 4. The compressive strength was in proportion to tensile strength. It was estimated that the compressive strength was 8.8 times of tensile strength. The compressive strength was in proportion to bending strength. It was estimated that the compressive strength was 4.0 times of bending strength. The bending strength was in proportion to tensile strength. It was estimated that the bending strength was 2.1 times of tensile strength. 5. At the mixing ratio of 1:1 the lowest absorption rates were showed by foamed mortars, respectively. It was significantly higher at the early stage of immersed water.
김기훈,강신엽 국방부군사편찬연구소 2008 군사 Vol.- No.66
A Manual for Korean traditional cross-bow, Nohae(弩解), is a military book which explains how to make Korean traditional cross-bows and how to operate them. It was written by Byeon Jin-yeong(邊震英), a former magistrate of Gapsan, northern frontier region of Joseon Dynasty. It was first published in 1727 and then republished in 1729 with revision of his friend, Yi Se-hwan(李世瑍). Nohae is a small book, of which the main text is composed of only 33 pages, among which 11 pages are allocated to drawings. Cross-bow is an improved version of traditional bow, by using wooden apparatus in order to reduce the required force to shoot arrows with greater penetrating power. In case of China, cross-bows had been extensively used since the Spring-autumn and Warring period (B.C. 8th-3rd century) to defend against northern nomadic tribes, who excelled in mounted combats. In the age of the Three Kingdoms (1st-7th century) in Korea, it seems cross- bows were widely employed in combats as the existence of specialized unit for cross-bows suggests. However, the use of cross-bows had become rarer in Goryeo Dynasty and by Joseon Dynasty, the techniques for cross-bow production were nearly extinct. In that respect, it can be argued that ‘A Manual for Cross-bow’ by Byeon Jin-yeong was a military book, designed to respond to the vanishing techniques for cross-bow production. Byeon Jin-yeong criticised the contemporary weaponry system that heavily relied on horn bows, and explained his hopes to introduce more user-friendly cross-bows than horn bows. In introduction, he lamented the fact that knowledge of cross-bow had not been maintained. He then recorded that he took the chance of his appointment as magistrate of northern frontiers to develop cross-bows based on ancient drawings and his own alterations, and had successful results. The main texts are composed of 13 parts, broadly divided into production techniques and operational methods. In production techniques, main components of cross-bows including arrows, cross-bow body, a trigger and pulley are described withdrawing. The part for operational methods explains how to install linked cross-bows, and suggest methods to use cross-bows for ambushes. It is followed by how to effectively use cross-bows in fortress defence or naval battles, and the last part proposes possible unit formations or suitable tactics to improve effectiveness of the weapon. Despite the hopes of the author, cross-bows had played little roles in the late Joseon Period. Byeon Jin-yeong’s manual itself, however, is a historically valuable contribution. It is the only existing manual of Korean cross-bows, whose meaning is highlighted by the fact that it is Joseon’s own manual of this powerful weapon.