• Journal of Korean Neurosurgical Society
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• 제41권4호
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• pp.267-268
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• 2007

Complications after surgery for chronic subdural hematoma [SDH] include recurrence of the hematoma, tension pneumoencephalus and intracerebral hematoma. We report an unusual case of development bilateral of acute subdural hematoma after drainage of chronic subdural hematoma in a 48-year-old woman. Pathophysiological mechanisms of this uncommon entity are discussed and relevant literature is reviewed.

• 지능정보연구
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• 제12권1호
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• pp.139-161
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• 2006

본 논문에서는 새로운 조합경매(combinational auction)모형인 다자간 최적화 경매모형(N-Bilateral Optimized Combinatorial Auction; N-BOCA)을 제시하였다. N-BOCA는 다수의 공급자 및 다수의 구매자간 최적화된 거래를 지원하는 조합경매모형이다. 특히 아키텍처, 거래규약, 거래전략 세가지 관점에서 N-BOCA 시스템을 설계하였다. 경매시장 참여자인 경매자들과 입찰자들은 특정 아키텍처 및 거래규약하에서 최적 거래 대상자 선정을 위한 다양한 전략을 가지게 되며 이러한 거래전략에 따른 유연한 의사결정 모델링 지원을 필요로 한다. 이에 본 논문에서는 최적의 입찰 및 경매자 선정을 위한 Integer Programming 모형 기반의 에이전트 시스템을 제시하였다. 아울러 N-BOCA모형의 유용성을 입증하기 위해 프로토타입과 실험결과를 제시하였다. 실험결과, 기존의 일대다 조합경매 모형 대비 높은 거래 성과를 나타내었다.

• Journal of Korean Neurosurgical Society
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• 제55권6호
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• pp.348-352
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• 2014

Objective : Management guidelines for single intracranial hematomas have been established, but the optimal management of multiple hematomas has little known. We present bilateral traumatic supratentorial hematomas that each has enough volume to be evacuated and discuss how to operate effectively it in a single anesthesia. Methods : In total, 203 patients underwent evacuation and/or decompressive craniectomies for acute intracranial hematomas over 5 years. Among them, only eight cases (3.9%) underwent operations for bilateral intracranial hematomas in a single session. Injury mechanism, initial Glasgow Coma Scale score, types of intracranial lesions, surgical methods, and Glasgow outcome scale were evaluated. Results : The most common injury mechanism was a fall (four cases). The types of intracranial lesions were epidural hematoma (EDH)/intracerebral hematoma (ICH) in five, EDH/EDH in one, EDH/subdural hematoma (SDH) in one, and ICH/SDH in one. All cases except one had an EDH. The EDH was addressed first in all cases. Then, the evacuation of the ICH was performed through a small craniotomy or burr hole. All patients except one survived. Conclusion : Bilateral intracranial hematomas that should be removed in a single-session operation are rare. Epidural hematomas almost always occur in these cases and should be removed first to prevent the hematoma from growing during the surgery. Then, the other hematoma, contralateral to the EDH, can be evacuated with a small craniotomy.

• 한국전문물리치료학회지
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• 제29권3호
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• pp.215-224
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• 2022

Background: The presence of the lumbopelvic-hip neuromuscular chain is essential for dynamic spinal stabilization; its therapeutic effects on dynamic movements of the distal extremity segment and underpinning motor mechanism remain unknown and warrant further study on participants with low back pain (LBP). Objects: We aim to compare the effects of the broken chain exercise (BCE) and connected chain exercise (CCE) on electromyography (EMG) amplitude and onset time in participants with and without LBP. Methods: Randomized controlled clinical trial. A convenience sample of 40 nonathletic participants (mean age: 24.78 ± 1.70) with and without LBP participated in this study. All participants underwent CCE for 30 minutes, 30-minute daily. We measured EMG amplitude and onset times on bilateral erector spinae (ES), gluteus maximus (GM), hamstring (HAM), transverse abdominis (TrA), internal oblique (IO), and external oblique (EO) during the prone hip extension (PHE) test before and after the BCE and CCE. We used multivariate analysis of variance (MANOVA) to analyze the amplitude and onset time difference between exercises (BCE and CCE) and Pearson's correlations to determine any synergistic relationship among the HAM, GM, bilateral TrA/IO, and ES muscles. The statistical analyses were used at p < 0.05. Results: MANOVA showed that CCE was more decreased on EMG amplitude in HAM and bilateral ES, while increased GM and contralateral TrA/IO than BCE (p < 0.05). MANOVA EMG onset time data analyses revealed that the main effect of the conditions was significant for all HAM, GM, and bilateral ES muscles, whereas the main effect for the group was significant only for GM and contralateral ES in healthy and LBP groups. Pearson's correlation coefficient was computed to assess the relationship between BCE and CCE on dependent variables. In most of the muscles, there was a strong, positive correlation between the two variables, and there was a significant relationship (p < 0.001). Conclusion: CCE produced more effective and coordinated core stabilization and motor control mechanism in the lumbopelvic-hip muscles in participants with and without LBP during PHE than BCE.

• 한국중재학회지:중재연구
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• 제13권2호
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• pp.123-156
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• 2004

Settlement of investment disputes is quite different from that of commercial disputes arising from ordinary commercial transactions in view of disputing parties, applicable laws and rules, etc.. Therefore, it is very important to consider the Convention on the Settlement of Investment Disputes between States and Nationals of Other States(Washington Convention) of 1965. The creation of the International Centre for Settlement of Investment Disputes(ICSID), which was established under the Washington Convention, was the belief that an institution specially designed to facilitate the settlement of investment disputes between governments and foreign investors could help to promote increased flows of international investment. Pursuant to the Washington Convention, ICSID provides facilities for the conciliation and arbitration of disputes between member countries and investors who qualify as nationals of other member countries. Recourse to ICSID conciliation and arbitration is entirely voluntary. However, once the parties have consented to arbitration under the Washington Convention, neither can unilaterally withdraw its consent. Moreover, all Contracting States of the Washington Convention are required by the Convention to recognize and enforce ICSID arbitral awards. Provisions on ICSID arbitration are commonly found in investment contracts between governments of member countries and investors from other member countries. Advance consents by governments to submit investment disputes to ICSID arbitration can also be found in many bilateral investment treaties including the Korea-China Agreement on the Encouragement and Reciprocal Protection of Investments(1992), the Korea-Japan Agreement for the Liberalization, Promotion and Protection of Investment(2003) and the Korea-Chile FTA, the latter was signed as of February 15, 2003 and is still pending in the National Assembly for its ratification. Arbitration under the auspices of ICSID is similarly one of the main mechanism for the settlement of investment disputes under the bilateral treaties on investment. Therefore, it is a problem of vital importance that Korean parties interested in investment to foreign countries should understand and cope with the settlement mechanism of investment disputes under the Washington Convention and bilateral investment treaties.

• 산경연구논집
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• 제13권9호
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• pp.11-26
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• 2022

Purpose: Manufacturers rely on interfirm governance mechanisms to reduce the risks inherent in uncertain environments; however, it is unclear which governance mechanisms are developed to manage relationships with suppliers. This study sought to enhance knowledge of how environmental uncertainty affects interfirm governance mechanisms under conditions reflecting varying levels of structural holes. To this end, the study investigated the relationships between manufacturers and major first-tier and sub-suppliers. In particular, the moderating effect of structural holes is examined. Research design, data and methodology: A questionnaire survey was conducted with a major first-tier supplier of a Korean engineering firm. Proposed hypotheses were tested using structural equation modeling. Results: The results show that while the relationship between environmental uncertainty and unilateral governance is positive but statistically insignificant, with bilateral governance is negative and statistically significant. The study also demonstrates that when structural holes are considered, the effects between environmental uncertainty and governance mechanisms are attenuated. Conclusions: This study suggests some theoretical and managerial contributions between exchange partners, especially, the results suggest that structural holes have a critical competitive advantage in uncertain environments. Therefore, manufacturers should carefully consider how they deal with environmental uncertainty when they make a business decision under structural holes situations.

• Journal of Korean Neurosurgical Society
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• 제41권4호
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• pp.272-274
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• 2007

Bilateral traumatic hemorrhage of the basal ganglia is an extremely rare neuropathologic entity. This report describes a 50year-old man with bilateral basal ganglia hemorrhage with occipital fracture of the skull after head trauma. The mechanism of development of traumatic hemorrhage of the basal ganglia has been not clear. But, it is presumed to be secondary to rupture of the lenticulostriate or anterior choroidal artery by shearing as a result of acceleration/deceleration forces. We briefly summarize our uncommon case and discuss its possible mechanisms.

• Journal of Information Processing Systems
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• 제18권1호
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• pp.59-74
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• 2022

During the last decade, the security of digital images has received considerable attention in various multimedia transmission schemes. However, many current cryptosystems tend to adopt a single-layer permutation or diffusion algorithm, resulting in inadequate security. A hierarchical bilateral diffusion architecture for color image encryption is proposed in response to this issue, based on a hyperchaotic system and DNA sequence operation. Primarily, two hyperchaotic systems are adopted and combined with cipher matrixes generation algorithm to overcome exhaustive attacks. Further, the proposed architecture involves designing pixelpermutation, pixel-diffusion, and DNA (deoxyribonucleic acid) based block-diffusion algorithm, considering system security and transmission efficiency. The pixel-permutation aims to reduce the correlation of adjacent pixels and provide excellent initial conditions for subsequent diffusion procedures, while the diffusion architecture confuses the image matrix in a bilateral direction with ultra-low power consumption. The proposed system achieves preferable number of pixel change rate (NPCR) and unified average changing intensity (UACI) of 99.61% and 33.46%, and a lower encryption time of 3.30 seconds, which performs better than some current image encryption algorithms. The simulated results and security analysis demonstrate that the proposed mechanism can resist various potential attacks with comparatively low computational time consumption.

• 한국응용약물학회:학술대회논문집
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• 한국응용약물학회 1995년도 춘계학술대회
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• pp.35-36
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• 1995

To gain insight into the etiological mechanism of dementia and to develop clinically effective congnitive enhancers, it is required to prepare animal models with symptoms and mechanism resemble to that in human. Dementia is mainly classified into two types : senile type of Alzheimer's disease (STAD) and cerebral ischemia-induced one. As animal models of cerebral ischemia, a couple of types in rats have been introduced : one is the occlusion of bilateral carotid arteries-induced forebrain/global ischemia and the other is the occlusion of middle cerebral arteries-induced focal/regional ischemia.

• 무역상무연구
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• 제13권
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• pp.699-733
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• 2000

This article analyzes the state-of-play of WTO dispute settlement for first four and a half years. Remarkable points found on this analysis are as follows: First, the Quad consisting of the United States, the European Community (EC), Canada and Japan has participated in the WTO dispute settlement mechanism more frequently than any other WTO member. Second, among developing country members some leading countries such as Korea, Brazil and India have relied actively upon the mechanism to claim and defend their rights and obligations under the WTO rules. Third, bilateral dispute settlements generally have been preferred to multilateral dispute settlements by the panel or Appellate Body. Fourth, observation of the Appellate Body proceedings well shows WTO members' strategy to use every process available to them. Fifth, the provisions of GATT 1994 have been most frequently invoked by the members. GATS and TRIPS Agreement disputes are mainly involved in developed countries, in particular the U.S. and the EC. Sixth, very high winning ratio in the panel and Appellate Body process indicates that complaining parties review the possibility to get favorable rulings even before referring to the Dispute Settlement Body (DSB) and prepare for the case very thoroughly. Seventh, roughly speaking, disputes were settled within two or three years. Therefore, seeking bilateral dispute settlement can be more advantageous to a complaining party than referring to a panel or an arbitrator because of low costs and short time period in dispute settlement. Finally, the DSB approved retaliatory actions for winning complaining parties against the defending parties who had rejected implementation of its rulings and recommendations. In conclusion, it can be said that the WTO dispute settlement mechanism has been operated very successfully for the first four and a half years. It is hoped that continued study on state-of-play of WTO dispute settlement mechanism will be contributory to improved national interest of Korea.