• Proceedings of the Korean Nuclear Society Conference
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• 1995.10a
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• pp.197-202
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• 1995

When the process disturbance of nuclear power plant occurred, the operator should ensure plant safety, economy and identify the causes of disturbance. To accomplish these goals, operator should process a large amounts of information. Among these, alarms would be often in the operator's first indication of a plant state change or disturbance. To support limited information processing capability of operator, considerable works are under way to develop advanced alarm processing systems and to evaluate it. However, conventional evaluation method could provide just evaluation results but the design alternatives to enhance alarm system performance. To overcome problems associated with conventional evaluation methods of alarm system, signal detection theory(SDT) was introduced, and it was possible conclude that SDT could not only evaluate system but also suggest design alternatives for performance enhancement.

• Proceedings of the Korean Information Science Society Conference
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• 2000.10c
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• pp.349-351
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• 2000

정보통신 분야의 급격한 발달은 다양한 프로토콜을 지원하는 통신 시스템의 개발 주기를 더욱 빠르게 하고 있다. 따라서, 소프트웨어 개발자들은 공식적인 규격에 따른 소프트웨어의 설계와 실제 구현단계 이전에 프로토타입의 구현을 통해 시스템의 요구사항 분석 및 문제점을 조기에 발견하고, 소프트웨어의 개발 주기를 단축시키며, 한편으로는 개발공정의 체계적 관리를 필요로 하게 되었다. 본 논문에서는 이에 대한 실질적인 해결방안을 제시하기 위해 통신 시스템의 명세서 작성 및 설계를 위한 표준화된 언어인 SDL(Specification and Description Language)을 이용해 WAP(Wireless Application Protocol)의 WTP (Wireless Transaction Protocol)를 설계하고, Telelogic사의 SDT를 이용하여 실행코드를 만들어 리눅스상에서 실제로 실행 가능한 프로토타입을 구현하였다.

• JOURNAL OF ELECTRICAL WORLD
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• s.421
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• pp.92-93
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• 2012

• Physical Therapy Rehabilitation Science
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• v.5 no.4
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• pp.193-197
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• 2016

Objective: In the present study, the effects of visual restriction and unstable base dual-task training (VUDT), stable base dual-task training (SDT), and on stroke patients' balance and concentration abilities were examined. Design: Two-group pretest-posttest design. Methods: Dual-task training was conducted for thirty persons with chronic stroke who were hospitalized or receiving physical therapy and were randomly assigned to either the VUDT group (n=15) or the SDT group (n=15). The subjects were divided into two groups of 15 participants each, the VUDT group and the SDT group. Dual-task training was administered for 30 minutes per session, three times a week for 8 weeks. The participants' balance was measured via the center of pressure migration distances, functional reach test (FRT), Berg Balance Scale (BBS), and attention was measured using the trail-making test and the Stroop test. Results: In comparisons within each group, the two groups showed significant differences before and after the training (p<0.05). In the comparisons between the groups, the VUDT group showed significant improvements in center of pressure (COP), FRT, and BBS, and TMT compared to the SDT group (p<0.05). Conclusions: It would be more effective to conduct dual-task training as a rehabilitation training program under vision restriction and unstable supporting surface conditions than to conduct the test under unstable supporting plane conditions to improve balance and attention in chronic stroke patients.

• Journal of Physiology & Pathology in Korean Medicine
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• v.27 no.2
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• pp.173-182
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• 2013

This Study was designed to investigate the effects of Sibjeondaebo-tang (SDT) and Gamy-Sibjeondaebo-tang (GST, Sibjeondaebo-tang adding Cervi Pantotrichum Cornu) on the improvement in regional cerebral blood flow (rCBF) and mean arterial blood pressure (MABP) in normal rats, and in the rats with cerebral ischemia induced by middle cerebral artery occlusion, and further to determine the mechanisms. And, It was to investigate the effects of the SDT and GST with the change of histologic examination through the BDNF in the hippocampus CA1. In changes of cerebral hemodynamics, SDT and GST significantly increased rCBF in a dose-dependent manner but decreased MABP in normal rats. In mechanism of cerebral hemodynamics, Increase of GST-induced rCBF was significantly inhibited by pretreatment with methylene blue (0.01 mg/kg, i.p.), an inhibitor of guanylate cyclase, and Decrease of GST-induced MABP was significantly increased by pretreatment with methylene. These results suggested that the action of GST was mediated by guantlate cyclase pathway. In cerebral ischemics, the rCBF was stably improved by SDT (10 mg/kg, i.p.) significantly and stably increased by GST (10 mg/kg, i.p.) during the period of cerebral reperfusion, which contrast with the findings of rapid and marked increase in Control group. These results suggested that GST had anti-ischemic action in cerebral ischemic state. In histological examination through TTC stain, Sample A group and Sample B group decreased discoloration in the cortical part at $28^{th}$ day after MCAO induction. In immunohistochemistric response of BDNF, Sample A group and Sample B group increased respondent effect at $28^{th}$ day after MCAO induction. These results suggest that GST can Increase rCBF in normal state, as well as improve the stability of rCBF in cerebral ischemic state. Furthermore, methylene blue inhibitor study suggested the mechanism of blood flow enhancement by GST may be mediated by guanylate cyclase pathway.

• Journal of the Korean Magnetics Society
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• v.11 no.5
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• pp.202-210
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• 2001

Spin dependent tunneling (SDT) junction devices of Ta/NiFe/Ta/NiFe/FeMn/NiFe/AlOx/CoFe/NiFe/Al with in-situ naturally oxidized Al barrier were fabricated using ion beam deposition and dc sputtering in UHV chamber of 10$^{-9}$ Torr. The maximum tunneling magnetoresistance (TMR) and the product resistance by junction (R$_{j}$ A) are 16-17% and 50-60 $\Omega$${\mu}{\textrm}{m}$$^2$, respectively. The values of TMR and (R$_{j}$ A) with field annealing were slightly increased. The TMR and (R$_{j}$ A) dependence versus the junction area size was observed. These results were explained by using sheet resistance effect of bottom electrode and spin channel effects.

• The KIPS Transactions:PartC
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• v.8C no.2
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• pp.189-197
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• 2001

공안된 통신 언어인 SDL을 이용하여 시스템을 설계하고, SDL 개발 도구인 SDT를 이용하여 실행 가능한 소프트웨어를 개발하고 실제 타겟 시스템과 동일한 환경에서 개발된 기증을 검증하는 개발 순기를 모두 수용하는 시뮬레이터의 개발이 대규모의 복잡한 통신 프로토콜에서는 필요하다. 본 논문에서는 IMT-2000 무선 프로토콜의 한 엔티티인 계층 2의 무선 링크제어 프로토콜 엔티티 RLC-AM(Acknowledged mode)의 개발 및 검증을 위하여, RLC-AM을 설계 및 구현한 후 이의 실행화일을 호스트 상에서 수행시킬 수 있는 호스트 시뮬레이터를 개발하였다. 호스트 컴퓨터상에서 SDT 개발환경, 컴파일 환경 및 운영체제 환경을 연동하여 개발된 호스트 시뮬레이터는 대상 프로토콜 엔티티를 MAC등 타 엔티티로 바꾸어서도 같은 방식으로 수행할 수 있다.

• Journal of Biomedical Engineering Research
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• v.30 no.2
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• pp.169-178
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• 2009

In this study, we suggest Korean nonlinear fitting formula (KNFF) to maximize speech intelligibility for digital hearing aids based on NAL-NL1 (NAL-nonlinear, version 1). KNFF was derived from the same procedure which is used for deriving NAL-NL1. KNFF consider the long-term average speech spectrum of Korean instead of English because the frequency characteristic of Korean is different from that of English. New insertion gains of KNFF were derived using the SII (speech intelligibility index) program provided by ANSI. In addition, the insertion gains were modified to maximize the intelligibility of high frequency words. To verify effect of the new fitting gain, we performed speech discrimination test (SDT) and preference test using the hearing loss simulator from NOISH. In the SDT, a word set as test material consists of 50 1-syllable word generally used in hearing clinic. As a result of the test, in case of moderate hearing loss with severe loss on high frequency, the SDT scores of KNFF was more improved about 3.2% than NAL-NLl and about 6% in case of the sever hearing loss. Finally we have obtained the result that it was the effective way to increase gain of mid-high frequency bands and to decrease gain of low frequency bands in order to maximize speech intelligibility of Korean.

• Journal of the Korean Institute of Telematics and Electronics S
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• v.34S no.2
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• pp.63-70
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• 1997

This paper proposes a new algorithm for recognizing polyhedral objects using a single 2-D image. It is base don a new representation scheme having two level hierarchey. In the lower level, geometrical features of each primitive surface are represented using their signatures and the variation of signature due to rotation is represented suing the rotation map. In the higher level, topological features are represented in the inter-surface description table(SDT). Based on the proposed representaton scheme, loer level database searched to find a matching primitive surface. The srotation map determines the degree of rotation as well as the matchness. If all surfaces in a test object find their matching primitive surfaces, its structural information is compared with the SDTs of object models. If primitive surfaces of a test object equal to tha tof certain model and satisfy inter-surfaces relationship in SDT, a test object is recognized as the model.

• Analytical Science and Technology
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• v.11 no.2
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• pp.145-149
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• 1998

Stability constants for the complexes of multidentate N,O-Schiff base ligands (bis-(salicylaldehyde)ethylendiamine(SED), bis-(salicylaldehyde)propylendiamine(SPD), bis-(salicylaldehyde)diethylenetriamine(SDT), bis-(salicylaldehyde)triethylenetetraamine(STT), and bis-(salicylaldehyde)tetraethylenepentaamine(STP) with Co(II) and Zn(II) were determined by a potentiometric method in a 70% dioxane-30% water mixture and ethanol, respectively. Stability constants for the complexes increased in the order of SPD