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마산수출자유지역내 연 및 유기용제 취급 여성근로자의 혈색소량 및 적혈구 용적에 관한 조사
김석봉,Kim, Seok-Bong 대한산업보건협회 1985 산업보건소식 Vol.21 No.-
A study on the hemoglobin and hematocrit concentrations of the lead exposed workers and organic solvent exposed workers in the Masan Free Export Zone
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.
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,유요한,Kim, Seokbong,Yoo, Yohan 한국군사과학기술학회 2015 한국군사과학기술학회지 Vol.18 No.2
This paper deals with the effect of concrete target size on penetration of projectiles. We investigated the penetration depth and residual velocity of projectiles using the 2-D axial symmetric model. Most analysis were conducted with 13 kg projectile (striking velocity: 456.4 m/s) and concrete target with compressive strength of 39 MPa. This paper provided penetration depth (or residual velocity) versus ratio D/d (target diameter, D and projectile diameter, d). When the bottom of concrete cylinder was constrained, penetration depth converged to limit depth more than the ratio D/d of 36. The residual velocity of projectile with thin concrete target were investigated. The residual velocity was converged to specific velocity more than the ratio D/d of 16.
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.
Sol-Coprecipitation 법에 의한 NO 감지용 $WO_3$ 센서 제조시 pH의 영향
김석봉,이대식,이덕동,허증수,Kim, Suk-Bong,Lee, Dae-Sik,Lee, Duk-Dong,Huh, Jeung-Soo 한국센서학회 2001 센서학회지 Vol.10 No.2
입자들이 용액에 녹아있을 때 pH에 따라서 다른 zeta-potential을 가지게 되며, 이것은 입자의 분산상태에 영향을 주게 된다. NO 센서에서 $WO_3$ 입자의 크기는 감도에 큰 영향을 끼치므로 Sol-Coprecipitation법에 의한 $WO_3$ 센서 제조 시에 $WO_3$ precursor 상태에서의 pH의 영향을 알아보았다. 먼저 $WO_3$ precursor의 전기적 포텐셜을 측정하여 pH가 2에서 7로 변함에 따라 mobility가 증가하여 7일 때에 가장 큰 분산도를 가진 것을 알 수 있었고, 이는 powder 제조 후 입도 분석, 감지막의 XRD peak, 표면사진으로부터 확인 할 수 있었다. 결과적으로 감도 특성에도 영향을 끼쳐 pH=7에서 제조한 센서가 다른 pH에서 제조한 센서보다 감도가 우수한 것으로 나타났다. When particles are dissolved in solution, they have different zeta-potentials depending on pH. Zeta-potential has an influence on particle separation, which can control particle size. And the size of $WO_3$ particle affects the sensitivity of $WO_3$ sensor for detecting NO gas. Therefore we study influence of pH on NO-sensing $WO_3$ gas sensor fabricated by Sol-Coprecipitation method. As pH increases from 2 to 7, dynamic mobility of $WO_3$ precursor was increased. When pH was 7, it showed the largest distribution separation. It means when pH is 7, we can make $WO_3$ powder which has smaller particle size. And it is confirmed by particle size analysis of $WO_3$ powder, X-ray diffration result of $WO_3$ sensing layer and surface morphology. It also affect NO sensing characteristics of $WO_3$ gas sensor. The sensing film synthesized at pH 7 showed the largest sensitivity.
김석봉,정상조,백상호,김태욱,박영준,Kim, Suk-Bong,Jeong, Sang-Jo,Baek, Sang-Ho,Kim, Tae-Wook,Park, Young-Jun 한국군사과학기술학회 2007 한국군사과학기술학회지 Vol.10 No.4
In this study, the Indoor Air Quality(IAQ) in military barracks is evaluated and its characteristics is discussed as well. The military barracks of R.O.K Army are categorized into three types and the IAQ in these individual facilities is measured for 24 hours both in summer and winter. Test results show that the particulate matters($PM_{10}$) and carbon dioxide($CO_2$) were the main causes contaminating IAQ in military barracks. While $CO_2$ can be purified by ventilation, adequate facilities have to be installed in case of the new type of combination barracks to remove $PM_{10}$. In addition, to improve the living condition of military barracks and to recover IAQ in new combination style barracks which is planned to complete by 2011, a standard or law regulating IAQ in military barracks has to be established.
A Feasibility Study Evaluating Standards for Covered-Positions Built with Concrete Materials
김석봉,강영철,이필재,백상호,박영준,우즈 폴,Kim, Suk-Bong,Kang, Young-Chul,Lee, Pil-Jae,Baek, Sang-Ho,Park, Young-Jun,Woods, Paul The Korea Institute of Military Science and Techno 2009 한국군사과학기술학회지 Vol.12 No.5
In terms of protective engineering, there are no noticeable researches regarding covered-positions for smaller units in South Korea. So, standards to maintain and build protective facilities for larger units have been applied in ones for smaller units without any adjustment. The previous study was to calculate penetration depth of the concrete walls because the experiment performed indoor. In this outdoor experiment, velocity of projectile impact as one of the other important factors was considered to prove the validity of 30cm concrete wall thickness as effective protective level of the covered-position. Random effects and extraneous variables which could be occurred in outdoors experiment were controlled with statistical techniques. As a result, velocity of projectile impact was significant variable and the given standard, 30cm thickness of concrete walls was as valid as ever.