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Crack Guidance Utilizing the Orientation of Additive Manufactured Lattice Structure
이준학,박성제,양정호,연시모,홍석준,손용,박지용 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.23 No.7
We propose a method to guide the direction of cracks by utilizing the orientation of Ti-6Al-4V lattice structures produced by powder bed fusion, which has recently attracted considerable attention in additive manufacturing. The fracture characteristics and impact strengths were observed by inserting a diagonal structure with structural anisotropy into specimens of various directions and densities, and it was confirmed that the impact strength differed depending on the differences between the direction of the z-strut, impact direction, and density of the lattice structure. Using this, crack guidance specimens with optimal lattice structures were manufactured along the direction of the cracks, and it was confirmed that cracks were uniformly induced in comparison to single lattice crack guidance specimens. This crack guidance is expected to be used in future machinery in various industries for the protection of important components and shock mitigation in the event of a sudden impact.
이준학,김형태,박준범,박상철,권영은,Lee, Jun-Hak,Kim, Hyung-Tae,Park, Jun-Beom,Park, Sang-Cheol,Kwon, Young-Eun 한국호스피스완화의료학회 2005 한국호스피스.완화의료학회지 Vol.8 No.1
Herpes zoster (HZ) is an acute infection of the unilateral sensory dermatome caused by varicella-zoster virus (VZV) and is characterized by vesicular eruption and unilateral pain along the involved dermatome. Although the pathogenesis of HZ is incompletely understood, it is thought that when cell-mediated immunity falls below a critical level, dormant VZV within cells of the sensory ganglia are allowed to replicate and infect the host with the resultant clinical presentation of HZ. It has been associated with immunosuppressed states, such as advanced age, leukemia, lymphoma, chemotherapy and/or radiation treatment. We present a case of a 62-year-old female patient with malignant lymphoma suffering herpes zoster ophthalmicus who did not respond to conventional treatment, and in whom the application of various nerve blocks and patient-controlled analgesia produced moderate pain relief. The patient died twenty days later due to cardiopulmonary failure.
이준학 한국문학과종교학회 1998 문학과종교 Vol.3 No.1
God punished Adam and Eve for their crime of eating the fruit of the tree of knowledge forbidden, pronouncing that in pains and travail Eve shall bring forth her children. and in the sweat of his face shall Adam eat bread. In the real human life, however, it is true that these two penalties, labour and childbirth, have changed to the inevitable conditions for the happiness of human life. Though women suffer from childbirth, how are we delighted and happy for the birth of a new life? We feel pity for the women who are unable to suffer from bringing forth a child. To sweat for bread, that is, having a job for work has become a great hope for all the people in the age of IMF. How long do we prepare for a job and how happy are we when we succeed in finding it? In Book X of Paradise Lost, Adam declared that $quot; with labour I must earn/ My bread: what harm? Idleness had been worse$quot; and throughout the whole body of Milton's poetry David Daiches $quot;find again and again images of agricultural labour as symbols of satisfaction. What we can imagine here is the abstruseness of God's great Providence beyond our understanding. Didn't He presuppose the contents of the punishment, labour and childbirth, would result in the prerequisite condition for the happiness of men in the future, though He sentenced men firmly to the penalty appropriate for their wrong doing in that situation of Eden? Isn't it true that we could only shut our mouth as Job who determined to reason with Jehovah for His persecution against him but couldn't answer at all for the questions of God and was hammered into submission? In a sense, we can say that God, by not condemning men to death for their disobedience unlike He first decreed, revealed His inevitable love for men, and at the same time ascribed not only happiness but also suffering resulting from the realization of their free will to themselves. If we accept this assumption, the question for the misery of the world and the existential suffering of men must be asked not to God but to men themselves. For, as Michael explained in Paradise Lost to Adam, the disease and suffering that men endure are the destiny of the world caused by the challenge of men against God. They are the reality of our existence and the products of the unredeemable situation of human existence.
대상포진후신경통 환자에서 안와상신경과 활차상신경에 Pulsed Radiofrequency에 의한 치료 경험 증례 보고
이준학,김태윤,하수호,권영은,윤채식 대한통증학회 2004 The Korean Journal of Pain Vol.17 No.2
Postherpetic neuralgia (PHN) is commonly defined as the pain that persists after a rash has healed, and may last months or sometimes even years. Multiple pharmacological agents and various nerve blocks have been used. Nerve blocks are a reliable and effective technique for the prevention and treatment of PHN. However, they require repeated injections as nerve blocks under local anesthetic sometimes only give the patient temporary relief from the pain of PHN. Recently, the advent of pulsed radiofrequency (PRF) lesioning has proved a successful treatment for refractory pain disorders. Two patients suffering from PHN presented at our clinic with a sharp and stabbing pain over the eye and forehead up to the vertex. Supraorbital and supratrochlear nerve block, with local anesthetic-steroid injections, gave good, but relatively short relief of the pain for several days, but there relief of pain, for more than 4 months, was longer and better with PRF lesioning.
전이성 암에 의한 경추통증 환자에서 시행한 내측지 박동성고주파술
이준학,하수호,김형태,박상철,권영은 대한마취통증의학회 2005 Korean Journal of Anesthesiology Vol.49 No.4
Metastatic spinal tumor may cause pain by direct tumor involvement of bone with activation of local nociceptors or compression of adjacent structures. As an adjunct to pharmacologic therapy, many patients benefit from the use of additional nerve blocks to treat cancer pain. However, they require repeated injections as nerve block under local anesthetic sometimes only give the patient temporary relief of pain. Recently, the advent of pulsed radiofrequency application has proved a successful treatment for refractory pain disorders. A 43 year-old man was presented with a constant, dull, aching pain in the posterior neck with radicular pain referred to right shoulder due to metastatic cervical spinal tumor. Right C5 and C6 medial branch nerve blocks, with local anesthetic-steroid injections were effective, but short pain relief for a couple of days. However, the pain relief lasted longer and was effective with pulsed radiofrequency application over 3 months.