• 한국게임학회 논문지
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• 제16권1호
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• pp.33-42
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• 2016

본 연구의 목적은 로그라이크 게임에서 파생된 영속적 죽음의 매커니즘을 고찰하고 해당 매커니즘이 가져오는 독특한 플레이 양식을 고찰하는 데 있다. 이를 위해 게임에서의 일반적인 죽음의 과정과 영속적 죽음의 과정을 비교 분석했으며 이후 영속적 죽음의 과정이 게임의 플레이와 리플레이에 미치는 결과를 살펴보았다. 영속적 죽음은 캐릭터의 부활 가능성이 없다는 점에서 극도의 긴장을 유발하는 플레이 사이클을 구축한다. 이러한 치명적 패널티는 플레이어로 하여금 죽음을 유예하기 위한 선택적 플레이를 야기하지만 이후 플레이어의 숙련된 스킬을 바탕으로 자신의 선택을 수정하고 대안적 세계를 구축해 나가는 리플레이로 이어진다. 신중한 선택과 대안적 플레이를 요하는 영속적 죽음의 매커니즘을 통해 진지한 고민을 담을 수 있는 게임의 새로운 가능성을 모색할 수 있을 것이다.

• 대한유전성대사질환학회지
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• 제13권2호
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• pp.75-80
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• 2013

Specific genetic conditions may lead to sudden unexpected deaths in infancy, such as inborn errors of fatty acid oxidation and genetic disorders of cardiac ion channels. The disease may present dramatically with severe hypoketotic hypoglycemia, Reye syndrome or sudden death, typically with a peak of frequency around 3-6 month, whilst neonatal sudden death is quite rare. When undetected, approximately 20-25% of infants will die or suffer permanent neurologic impairment as a consequence of the first acute metabolic decompensation. Meanwhile, the advent of newborn screening for metabolic diseases has revealed populations of patients with disorders of fatty acid oxidation (FAO), the most frequent of which is medium chain acyl-CoA dehydrogenase (MCAD) deficiency. Without this screening, affected individuals would likely succumb to sudden infant death syndrome (SIDS). Here we describe an overview of sudden infant death syndrome and inherited metabolic disorder.

• The Korean Journal of Physiology and Pharmacology
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• 제12권3호
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• pp.89-94
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• 2008

In order to reproduce chronic cerebral hypoperfusion as it occurs in human aging and Alzheimer's disease, we introduced permanent, bilateral occlusion of the common carotid arteries (BCCAO) in rats (Farkas et al, 2007). Here, we induced BCCAO in two different rat strains in order to determine whether there was a strain difference in the pathogenic response to BCCAO. Male Wistar and Sprague-Dawley (SD) rats (250-270 g) were subjected to BCCAO for three weeks. Kluver-Barrera and cresyl violet staining were used to evaluate white matter and gray matter damage, respectively. Wistar rats had a considerably higher mortality rate (four of 14 rats) as compared to SD rats (one of 15 rats) following BCCAO. Complete loss of pupillary light reflex occurred in all Wistar rats that survived, but loss of pupillary light reflex did not occur at all in SD rats. Moreover, BCCAO induced marked vacuolation in the optic tract of Wistar rats as compared to SD rats. In contrast, SD rats showed fewer CA1 hippocampal neurons than Wistar rats following BCCAO. These results suggest that the neuropathological process induced by BCCAO takes place in a region-specific pattern that varies according to the strain of rat involved.

• 의료법학
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• 제10권1호
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• pp.263-305
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• 2009

Is it lawful to withhold or withdraw life-sustaining treatment applied to a patient in a terminal condition or permanent unconscious condition? In Korea, there are no such laws or regulations which control affairs related to the withholding or withdrawal life-support treatment and active euthanasia as the Natural Death Act or the Death with Dignity Act in the U. S. A. And in addition there has had no precedent of Supreme Court. Recently Supreme Court has pronounced a historical judgment on a terminal care case. The court allowed the withdrawal of life-sustaining treatment from a patient in a permanent unconscious state. Fundamentally the court judged that the continuation of that medical treatment would infringe dignity and value of a patient as a human being. And the court required some legal grounds to consider such withdrawal or withholding of medical care lawful. The legal grounds are as follow. First, the patient is in a incurable and irreversible condition and already entered a stage of death. Second, the patient executed a directive, in advance, directing the withholding or withdrawal of life-support treatment in a incurable and irreversible condition or in a terminal condition. Otherwise, at least, the patient's will would be presumed through his/her character, view of value, philosophy, religious faith and career etc. I regard if a patient is in a incurable and irreversible condition or in a terminal condition, the medical contract between a patient and a doctor would be terminated because of the actual impossibility of achievement of it's purpose. So I think the discontinuation of life-sustaining care would be legally allowed without depending on the patient's own will.

• Molecules and Cells
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• 제22권2호
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• pp.198-202
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• 2006

The $P2X_7$ receptor, an ATP-gated cation channel, induces cell death in immune cells and is involved in neurodegenerative diseases. Although the receptor plays various roles in these diseases, the cellular mechanisms involved are poorly understood and antagonists are limited. Here, the development of a cell-based assay for human $P2X_7$ receptor is reported. We established permanent lines of HEK 293 cells expressing a high level of $hP2X_7$ receptor. Functional activity of the $hP2X_7$ receptor was confirmed by whole-cell patch recording of ATP-induced ion currents. Prolonged exposure to ATP resulted in death of the $hP2X_7$-expressing HEK 293 cells and this cell death could be quantified. Two known $P2X_7$ antagonists, PPADS and KN-62, blocked ATP-induced death in a concentration-dependent manner. Thus, this assay can be used to screen for new antagonists of $hP2X_7$ receptors.

• 동의생리병리학회지
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• 제18권1호
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• pp.236-242
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• 2004

Cerebral ischemia resulting from transient or permanent occlusion of cerebral arteries leads to neuronal cell death and eventually causes neurological impairments. Bee venom has been used for the treatment inflammatory disease. In the present study, the effects of bee venom on apoptosis and cell proliferation in the hippocampal dentate gyrus following transient global ischemia in gerbils were investigated using immunohistochemistry for cyclooxygenase-1 (COX-1) and cyclooxygenase-2 (COX-2), caspase-3, and 5-bromo-2'-deoxyuridine (BrdU). It was shown that apoptotic cell death and cell proliferation in the hippocampal dentate gyrus were significantly increased following transient global ischemia in gerbils and that treatment of bee venom suppressed the ischemia-induced increase in apoptosis and cell proliferation in the dentate gyrus. The present results also showed that 1 mg/kg bee-venom treatment suppressed the ischemia-induced increasing apoptosis, cell proliferation, and COX-2 expression in the dentate gyrus. It is possible that the suppression of cell proliferation is due to the reduction of apoptotic cell death by treatment of bee venom. In the present study, bee venom was shown to prosses anti-apoptotic effect in ischemic brain disease, and this protective effect of bee venom against ischemia-induced neuronal cell death is closely associated with suppression on caspase-3 expression.

• 한국약용작물학회지
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• 제17권5호
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• pp.341-345
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• 2009

Cerebral ischemia results from a transient or permanent reduction in cerebral blood flow that decreases oxygen and glucose supply. When the cellular oxygen supply is reduced to critical level, damage to cells and induction of cell death are occurred by excitotoxicity, oxidative stress and inflammation. Ischemia remains one of the leading causes of death, but there is no effective treatment that might protect neurons gainst ischemia by interrupting the cascade of cell death. In this study, human neuroblastoma SH-SY5Y cells are exposed to oxygen and glucose deprivation (OGD) followed by reoxgenation. OGD can mimic the acute restriction of metabolite and oxygen supply caused by ischemia and is widely used as a model of ischemic conditions. SH-SY5Y cells are treated samples at the commencement of OGD to achieve different final concentrations, and cell viabilities were quantified using the measurement of flow cytometry analysis. Of those tested, the extracts of Polygala tenuifolia (roots), Dictamnus dasycarpus (barks), Polygala tenuifolia (roots), Eucommia ulmoides (branches), Eucommia ulmoides (barks), Poria cocos (whole), Sophora flavescens (roots) showed neuroprotective effects, with $EC_{50}$ values of $4.5{\pm}0.6$, $7.9{\pm}1.5$, $10.5{\pm}0.7$, $18.4{\pm}1.9$, $19.6{\pm}0.3$, $21.6{\pm}1.9$, and $30.7{\pm}3.9{\mu}g/m{\ell}$, respectively.

• 대한한의학회지
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• 제30권1호
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• pp.64-75
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• 2009

Objective: This study was designed to investigate the effect of Samultang (SMT) under hippocampus cells ischemia both in vitro and in vivo. Methods: In the in vitro study, HT22 cells, predominantly detected in the cytoplasm, which coincides with the location of the mitochondria, were used as indicators. In the in vivo study, permanent middle cerebral artery occlusion (MCAO) was induced on rats. SMT was given orally 2 h before induction of permanent focal brain ischemic injury. Result: In the in vitro study, SMT had protective effects in glutamate-induced cytotoxicity, which was revealed as apoptosis characterized by chromatic condensation and the loss of mitochondrial membrane potential in HT22 cells. In the in vivo study, TTC (2,3,5-triphenyltetrazolium chloride) staining showed a marked ischemic injury in blood supply territory of the middle cerebral artery (MCA) such as the cerebral cortex and striatum. However, treatment with SMT significantly reduced infarcted volume. SMT increased marked survival of HT22 cells against glutamate-induced cytotoxicity in MTT assay. Conclusion: These results suggest that water extract of SMT provides neuroprotection against ischemic or oxidative injury by inhibition of apoptotic cell death.

• Journal of Chest Surgery
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• 제28권4호
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• pp.346-354
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• 1995

Records of 71 consecutive patients who had received multiple valve replacement were reviewed[34male,37female,mean age 40.5$\pm$11.2 <14-63> . The early death rate was 2.8%[2/71 . A completed follow-up rate of 95.7% was accomplished in these 69 patients who left hospital[mean 42.5 $\pm$29.5 patients-years . Five of these patients died. The late death rate was 7.2%. Four patients experienced anticoagulant-related hemorrhage[all were minor . One patient had a thromboembolic episode[permanent ,and 2 had late prosthetic valve endocarditis. There was no clinical evidence of hemolysis and structural failure of valves used. Of those patients who survived,NYHA functional class improved significantly[from 87.2% class III & IV before to 95.8% class I & II after . Linearized rates for thromboembolism and anticoagulant-related hemorrhage,and for prosthetic valve endocarditis were 0.67%/100 patient-years,2.95%/100 patient-years,1.34%/100 patient-years, respectively. The actuarial estimates of incidence free of all complications and valve-related deaths were 92.2%/patient-years.Despites the advanced heart disease involving two or more native valves, the patients who had multiple valve replacement had very good results, over a 9-year period.

• Journal of Chest Surgery
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• 제23권4호
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• pp.750-757
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• 1990

Empyema with bronchopleural fistula is an uncommon, but serious problem. Early diagnosis and adequate drainage of the empyema cavity are well established principles for the initial management of this condition and will enable patient to recover from the toxic effects of loculated pus. 37 patients of empyema with bronchopleural fistula were treated at the department of the chonbuk National University Hospital between 1981 and 1988. The age group of fifty and sixty decades occupied 64.8%. Bacteriologic cultures of the pus were postive in 56.8%. The most common organism of the culture was staphylococci(42.9%). And the others were Pseudomonas(19%). Klebsiella(14.3%), and E. doli. No growth of pathologic organism was reported 43.2%. 24 patients of empyema with bronchopleural fistula were nonoperative causes : There were 10 pulmonary tuberculosis, 3 abscess, 9 ascending infection, one bronchiectasis and one tumor, respectively. The remaining 13 were occurred as postoperative complications ; pneumonectomy in 6, lobectomy in 4, decortication in 2, and lobectomy with segmentectomy in 1. When used as the initial mode of drainage, closed thoracostomy was performed to almost all of the patients, but 4 patients were died during this treatment. Main operations were performed except 4 died patients ; open thoracostomy in 21, open thoracostomy with myoplasty in 3, decortication in 5, decortication with resection in 3, and completion pneumonectomy in 1. Open thoracostomy was performed in 21 patients which results were favorable except one death. Permanent open thoracostomy is an old but still useful minor operation in patients with empyema with bronchopleural fistula. The overall mortality rate was 15% (6 patients) and the causes of the death were respiratory insufficiency or sepsis, or both.