• Journal of the Korean Society of Propulsion Engineers
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• v.21 no.4
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• pp.36-43
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• 2017

We studied attenuation characteristics of shock waves induced by a donor charge and the sensitivity of an acceptor for optimal design of a TBI (Through-bulkhead initiator). The attenuation behavior of shock waves was studied by measuring free surface velocity using a VISAR (Velocity Interferometer System for Any Reflector), and the sensitivity of the acceptor explosives was analyzed via SSGT (Small Scale Gap Test). It was found that the acceptor sensitivity obtained by the SSGT may be inappropriate for the design of the small-scale explosive devices such as TBI due to the different shock duration time.

• 대한상한금궤의학회지
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• v.14 no.1
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• pp.81-93
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• 2022

Objective : This study reports on the case of a patient with irritable bowel syndrome (IBS) diagnosed by the Shanghanlun disease pattern identification diagnostic system (DPIDS). We tried to verify the therapeutic effects of Soseunggi-tang (SSGT) administration and pathological character. Methods : The patient was administered SSGT for 31 days. We observed the progression of symptoms, patient compliance, and the presence of side effects. The progression of IBS was evaluated based the on Gastrointestinal Symptom Rating Scale (GSRS). Abdominal pain, flatus, visual findings, and patient statements were also assessed. Results : According to the DPIDS, the patient was diagnosed with Yangmingbing (陽明病). As a result, his GSRS score dropped from 15 to 5, the visual analog scale (VAS) score for abdominal pain lowered from 9 to 4, and the VAS score for flatus decreased from 8 to 4. The stool type changed from diarrhea to a loose stool form. Conclusions : SSGT showed therapeutic effects on the patient diagnosed with IBS and Yangmingbing.

• Journal of the Korean Society of Propulsion Engineers
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• v.20 no.5
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• pp.19-30
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• 2016

We presented a hydrodynamic modeling necessary to accurately reproduce shock-induced detonation of pyrotechnic initiator. The methodology for such numerical prediction of shock propagation is quite straight forward if the models are properly implemented and solved in a well-formulated shock physics code. A series of SSGT(Small Scale Gap Test) and detailed hydrodynamic simulation are conducted to quantify the shock sensitivity of an acceptor that contains 97.5% RDX. A TBI(Through Bulkhead Initiator) system, consisting of a train configuration of Donor(HNS+HMX) - Bulkhead(STS) - Acceptor(RDX), were investigated to further validate the interaction between energetic and non-reactive materials for predicting the detonating response for successful operation of such small pyro device.