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전방막사의 단열개수로 인한 에너지 소비절감 효과에 관한 연구
金錫蜂 陸軍士官學校 1986 한국군사학논집 Vol.30 No.-
The purpose of this study is to compare the thermal and economic efficiency between the existing military barracks of frontal area and those which retrofitted on the basis of energy conservation. The results are as follows; 1) According to the standard design of combined military barracks of the Army, the K value of the roof is 0.520, the K value of the out-wall is 0.526. They are even below the national standard level of isolation of heat. Therefore in order to qualify the national standard level, the thickness of polystyrenefoam should be changed from 50mm of the present to 75mm. 2) In case of existing military barracks, the heat loss per each column which is attached to the outer-wall is 102 kcal/h. But in the barracks which are retrofitted, the heat loss can be lowered to 24kcal/h. 3) In case of existing military barracks, the heat loss between the wall and the slab of the first floor is 32,000 kcal/h in total. But if we retrofit the barracks, the heat loss can be diminished up to 25%. 4) If we retrofit the barracks, not only the isolation level of heat would satisfy the standard level but also the cost of heating might be decreased to a great degree. Also, Since the cost of retrofit would be returned in about three years, we can say it is economically efficient.
김석봉,유요한,Kim, Seok-Bong,Yoo, Yo-Han 한국군사과학기술학회 2013 한국군사과학기술학회지 Vol.16 No.4
In this paper, we have investigated deformation of cup for EFI detonator in high velocity impact test. The experimental result shows that STS cup deformed 0.170 mm with the bulged shape. The numerical simulation result with static/dynamic material properties of SUS304 shows 0.166 mm of deformation. The main parameters to decrease the deformation of cup are stength, thickness and density of cup. The initial condition of SUS304 cup was strength of 215 MPa and thickness of 0.12 mm. As strength increases to 500 MPa, deformation of cup converges to 0 mm, and as thickness increases to 0.18 mm, deformation of cup converges to 0 mm. If the density of cup decreases from 8 to 2.7 g/cc, the deformation of cup decreases to 0.141 mm.
김석봉,이창수,유요한,Kim, Seokbong,Lee, Changsoo,Yoo, Yohan 한국군사과학기술학회 2017 한국군사과학기술학회지 Vol.20 No.2
This paper deals with the scale effects of warhead on concrete penetration. We investigated the scale effects using finite element analysis and Young's penetration equation. As the scale of penetration test decreases, the strain rate effects of target increases, and then strength of concrete target increases. This means the residual velocity and penetration depth of warhead decreases as the test model size decreases. Young's penetration equations are transformed with various penetrator mass and scale cases as a function of scale ratio. Penetration distance and residual velocity are not simply changed by the geometric scaling law.
소구경 탄자에 대한 철근콘크리트 슬래브의 관입저항력 평가
김석봉,강영철,이종찬,백상호,박영준,Kim, Suk-Bong,Kang, Young-Chul,Lee, Jong-Chan,Baek, Sang-Ho,Park, Young-Jun 한국군사과학기술학회 2007 한국군사과학기술학회지 Vol.10 No.2
So far, anti-piercing depths for concrete slabs have been determined using Conventional Weapon's Effects Program(CONWEP) that was developed by the U. S. Army's Corps of Engineering. However, it has been suggested by a number of field officers that the values computed by CONWEP tend to be too high for protective facilities used in small military units and that indiscriminate application of these values to such facilities would lead to uneconomical penetration-proof designs. In this study, gunshots onto RC slabs were carried out using KM80 bullets in order to measure the piercing depths. The observed depths and the depths offered by the CONWEP system differed greatly from each other by up to 119 centimeters. Based on the depth values obtained through this experiment, we have proposed a new equation to calculate effective anti-piercing depths for RC slabs against small caliber bullets.
김석봉,윤상호,민경찬,안성진,박영준 한국건축시공학회 2013 한국건축시공학회지 Vol.13 No.1
This study aims to examine the effectiveness of electromagnetic pulse shielding in cast-in-place protective shelters using corrugated metal-plates, and then reviews their usability for the Republic of Korea Army. The Korea Corps of Engineering has evaluated corrugated metal-plates as a construction material for cast-in-place structures, which have to defend against mechanical impacts as well as electromagnetic pulses. Corrugated metal-plate is known as a superb mechanical protective material, so much so that it has been employed in ammunition magazines and artillery platforms in the armed forces. Moreover, as a metal, such as steel and copper, it is universally recognized as one of the most effective electromagnetic pulse shielding materials. In addition to effectively shielding from electromagnetic pulses and protecting against mechanical impacts, corrugated metal-plates should prove to be an appropriate construction material for the cast-in-place protective shelter in terms of construction availability and economic feasibility. The shielding effectiveness of the suggested structures is examined based on MIL-STD 188-125-1. A few frequency bands need an increase of 15∼30dB in shielding effectiveness because of unbidden apertures caused by flaws associated with welding,assembling, and material deformation. However, allowing for the approximately 40dB of shielding provided by soil; the examined structure, which is buried underground, can offset its shortcomings sufficiently.