• Tunnel and Underground Space
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• v.20 no.5
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• pp.325-331
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• 2010

In the present research paper large scale blasting was conducted on two different firing patterns, namely, straight V type and skewed V type pattern on the same sandstone overburden bench with similar explosives. The post-blast fragmentation assessments were made by use of digital imaging technique. The total cycle time of 10 $m^3$ rope shovels was also recorded in the field. The results reveal improvements in the fragmentation and excavator performance results for the blasts fired on skewed V type pattern. The paper discusses the skewed V firing pattern and the reasons for its superior performance vis-$\grave{a}$-vis the straight V type pattern.

• Journal of the Korea Institute of Military Science and Technology
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• v.24 no.5
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• pp.503-510
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• 2021

This paper presents a system that measures the acceleration of the shock caused by the explosion of the precursor warhead for the tandem projectile. The proposed system, which is implemented based on the MIL-STD-810G, Method 517.1, consists of a miniaturized shock measurement device, a cable, accelerometers, and a trigger circuit. The shock measurement device has a size of ¢102 × 171 mm and cable has a length of 3 m. The operational confirmation test is conducted by implementing the measurement system. The Analysis of shock data(accelerometer output data) is carried out using Shock Response Spectrum(SRS), pseudo velocity and plot of acceleration time transient. Through measurement analysis, one can predict the damage of electronics in projectile when precursor warhead is exploded.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.15 no.2
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• pp.269-272
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• 2015

this is the study of the human body antenna device which can detect the powder in a 360-degree on(under) the ground whether it is metal or nonmetal using superhigh frequency RF beam equipped with the body. and it is able to transmit the data of the detection of the powder, battle combats can share that among them. with its flexible roof radial antenna structure, it emits the superhigh frequency RF beam to the front and flank multiply, preprocesses through the powder preprocessing part. and with the non-linear regression model algorism engine part, reflecting the attenuation characteristics depend on the delayed time of degree of the signal power which is received to the superhigh frequency RF beam. so it is able to detect the signal of the most likely mine or powder based on the degree of the answer signal power according to the delayed time of the superhigh frequency RF beam. also, it can detect the powder whether it is metal or nonmetal, mine, dud, VBIED. it can increase the chance of detection about 90% more than existing mine detector.

• Explosives and Blasting
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• v.22 no.3
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• pp.57-64
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• 2004

There are two major types of underwater blasting at Korea, bridges and harbor construction work. Pier blasting for lay the foundation bridges construction is used dry excavation working (drilling and charging) after pump out water and then fire pump in water that is same as bench blasting. In contrast, underwater blasting for harbor construction and increase of harbor load depth is used to barge with digging equipment that is in oder to drilling on the surface and blasting work(charge, hook-up) under water. Thus, there are need to special concern such as charge method and hook-up method different from tunnel blasting work and bench blasting work. If do not use special concern breaks out dead pressure and mis fire because of there are so many difficult condition such as water pressure, obstruct field of vision. In this study underwater blasting at Busan Harbor Construction have consider with special concern that is plastic pipe charge method used to MegaMITE I and specialized buoy hook- up method make far initial system detonate on the surface used to TLD. The results is designed blast pattern charge per delay effect an inspection of verify between predict velocity and measure velocity. minimized break out mis fire consideration charge method, hook up method. According to result best underwater blasting design is 105mm drilling dia, MeGAMITE II, HiNLL Plus(non electric detonator).

• Defense and Technology
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• no.1 s.155
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• pp.38-43
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• 1992

유도무기는 개발에서 폐기까지 최소한 십년 이상이 소요되는 장기사업이며, 현재 전자파 환경이 급속히 복잡, 강력화 되는 추세일 뿐만아니라 적의 기만전술인 전자파 대항 기법의 발전추세를 비추어 볼때, 실로 장기적인 안목에서 대처해야 할 것이다. 특히 전기기폭장치(EED)의 오작동시 미칠 영향을 고려한다면, 전자파에 대한 안전을 최대한 강구해야함은 물론 상대적으로 낙후되어 있는 전자파 시험평가시설 및 기술의 선진화가 추진되어야 할 것이다

• ETRI Journal
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• v.8 no.4
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• pp.154-160
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• 1986

정보경제란 일국의 경제에 있어서 정보의 가치가 공업경제하의 자본의 가치와 같이 중요한 생산요소로서 작용하는 경제시스팀을 의미하는 바, 정보경제의 기반 형성과정은 금융의 자유화를 근간으로 하는 "금융혁명" 과 컴퓨터와 정보통신 기술을 근간으로 하는 "정보혁명"의 동시진행으로 요약할 수 있다. 가용자원이 최적 배분되는 완전경쟁 (perfect competition)의 실현을 가능케 하는 정보경제는 "공업경제의 궁극적 완성" 이라 할 수 있으며 이 두가지 요소는 정보경제를 생성시키는 기폭제로서 작용하게 된다.

• Proceedings of the KSME Conference
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• 2005.11a
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• pp.96.2-96.2
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• 2005

• The Safety technology
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• no.122
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• pp.18-19
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• 2008

'1974년에 창립한 삼창기업 주식회사는 고리원자력발전소가 정상 운전 중 발생할 수 있는 결함처리, 일상 예방정비 및 계획 예방정비 업무를 수행하면서 무재해 10배라는 경이로운 기록을 달성하였다. 이는 부산지역 내에서 다섯 손가락 안에 들어가는 대기록으로 지역 안전문화 정착에 기폭제로 충분하다. 특히 삼창기업(주) 산업재해의 온상이라는 100인 미만의 소규모 사업장이라는 점에서 이들의 무재해 기록은 의미가 크다 할 수 있다.

• Explosives and Blasting
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• v.28 no.1
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• pp.19-26
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• 2010

The paper presents a case study of a limestone quarry of the Philippines, where major problems in terms of improper fragmentation, poor wall control, and poor heave of the muck pile were witnessed. The paper highlights the significant role of switching over from diagonal firing pattern to V-type firing pattern, and also of making suitable adjustments in the stemming column length for improved confinement and gas retention. The study revealed that by making aforesaid design modifications in the blast round, marked improvement in blasting results was registered. Looking at the results, it was further contemplated to expand the mesh area in the subsequent blast rounds. The mesh area was incremented from the existing $8.96m^2$ to $12m^2$. The results were meticulously registered in the field, and clearly depicted definite improvements in the blast results in terms of increased P.F., reduced boulder count, reduced FEL cycle time, reduced dozing hours and improved heave.

• Explosives and Blasting
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• v.36 no.3
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• pp.29-38
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• 2018

With the recent industrial developments and economic development nationally, there has been a rapidly increasing demand for the use of underground space as locations for establishing social infrastructure and various convenience facilities. In this study, a mist-control system was developed to reduce the generation of dust in underground blasting. To enhance the dust-reduction effect, a guiding device was developed which is capable of adjusting the direction of the spray toward's the blasting face of mine or tunnel. A numerical analysis was performed by using the AUTODYN software, and results were compared with those published in basic experiments. To verify the mist-diffusion effect according to the position of explosives in a water bag, numerical analyses were conducted for the following cases: Explosives were set in the middle, and in the bottom of the water bag. The optimum condition was external detonation and center charge. The mist particle size from the result was suitable for the reduction of dust after blasting in underground mine and tunnel.