• Journal of the Korea Institute of Information and Communication Engineering
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• v.11 no.1
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• pp.34-39
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• 2007

According to the active use of internet the need for security in various environment is being emphasized. Moreover with the broad use of Messenger on PC and P2P applications. the security and management of individual hosts on internet became very important issues. Therefore in this paper we propose the design and implementation of a host based access control system for the hosts on internet including window based PC which provides access control, information on packets, and record and monitoring of log files.

• The Journal of the Korea Contents Association
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• v.10 no.10
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• pp.26-35
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• 2010

Recently, multi client PC technologies that several users can use one set of computer at the same time are being designed to use the surplus computer resource. In general, as the existing PC management system considers only a single client PC that only one user uses a computer, various kinds of complicated problems may be arisen. This paper designs and realizes a remote management system that can monitor and control the information used in the windows based OS multi-client using WMI technology. The proposed system herein uses WMI technology and newly defined client management protocol and provides the monitoring and control functions on individual resource use information of multi-client. As well, it provides a communication function between the server and the client, and locking setting and access control functions.

• Proceedings of the IEEK Conference
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• 1999.06a
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• pp.1129-1132
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• 1999

This paper deals with the design and implementation of an Ethernet-based communication protocol to be used in PC-based I/O interface systems. Recently, the performance of PC systems is being highly improved and Ethernet is used as the stable communication network over the world. We develop a new protocol driver with the capability of accessing Ethernet directly using NDIS(Network Driver Interface Specification), the network interface standard of Windows O.S. in PC, and install it at the application layer of the protocol structure. Its major roles are the supplement of CSMA/CD algorithm, the effective use of the long data frame of Ethernet, and the real-time transmission of data frames. This paper represents the possibility of the real-time control network and systems based on PCs and Ethernet.

• Korean Journal of Pharmacognosy
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• v.30 no.1
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• pp.79-83
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• 1999

The effects of coralyne, a protoberberine isoquinoline compound, on dopamine biosynthesis in PC12 cells were investigated. Coralyne decreased the dopamine content dose-dependently $(46.3%\;inhibition\;at\;20\;{\mu}M\;for\;24 hr).$ Dopamine content was lowered at 6 hr and reached minimal level at 24 hr after exposure to coralyne at $20\;{\mu}M.$ The decreased dopamine level was maintained up to 48 hr and recovered to the control level at about 72 hr. Tyrosine hydroxylase, the rate-limiting enzyme in the catecholamine biosynthesis, was also inhibited at $20\;{\mu}M\;of\;coralyne$ by 16.1% relative to control. These results suggest that the inhibition of tyrosine hydroxylase by coralyne with a single treatment might be partially contributed to the decrease in dopamine content in PC12 cells.

• YAKHAK HOEJI
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• v.42 no.2
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• pp.170-174
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• 1998

The effects of bulbocapnine, an aporphine isoquinoline alkaloid, on dopamine content in PC12 cells were investigated. Bulbocapnine decreased the dopamine content dose-dependentl y (39.2% inhibition at 2O${\mu}$M for 24 hr). The $IC_{50}$ value of bulbocapnine was 22.7${\mu}$M. Dopamine content was lowered at 6 hr after exposure to bulbocapnine. And then, the decreased dopamine level was almost maintained at 36 hr and recovered to the control level at about 60 hr. Tyrosine hydroxylase, the rate limiting enzyme in the catecholamine blosynthetic pathway, was also inhibited at 20${\mu}$M of bulbocapnine by 23.1% relative to control. We, therefore, hypothesized that the inhibition of tyrosine hydroxylase by bulbocapnine with a single treatment might be partially contributed to the decrease in dopamine content in PC12 cells.

• Proceedings of the IEEK Conference
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• 2002.07c
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• pp.1956-1959
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• 2002

Power control (PC) on the reverse link of CDMA cellular system is important to increase system capacity. PC eliminates fluctuations in the received signal level and hence reduces the required signal-to-interference ratio. However, both perfect PC and imperfect PC depend on number of interferences as number of users, which by using smart antenna system can decrease number of interferences in any directions except interferences from the main beam direction. In this paper , number of elements in smart antenna system, which directly relates to the main beam pattern, is studied to find the effects on the outage probability , bit energy-to-interference density ratio (Eb/Io) and the capacities of both perfect and imperfect PC.

• Korean Journal of Environmental Agriculture
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• v.19 no.4
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• pp.284-293
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• 2000

For the artificial removal of air pollutants such as pesticides, environmental toxicants, and pathogenic microorganisms in the greenhouse or the living environment, the accelerated photodegradation and the biocidal effects of some photosensitizers (PS)/photocatalysts (PC) were tested under the sunlight and/or artificial light. The selected photosensitizers/photocatalysts included the semiconductors (PC-1 and PC-2), the oxidizers (PC-3, PC-4, PC-5 and PC-6), the aromatic ketone (PS-7) and the aromatic amine (PS-8). In the case of dichlorvos, all the photocatalysts selected showed more accelerated photodegradation than the control without photocatalysts under both the sunlight and artificial light. Whereas, only the photocatalyst PC-1 accelerated the degradation of methyl tert-butyl ether about 17 times more than the control under both the sunlight and artificial light. Procymidone was much more degraded by the photosensitizer PS-8 and the two photocatalysts (PC-1, PC-6) than by PS-7. In the preliminary experiments to diminish the population of the microorganisms in the air, the photocatalyst PC-1 added to the suspensions of Pseudomonas putida, Phytophthora capsici, and Salmonella typhimurium obviously inhibited the microbial growth under the artificial light. The photocatalyst PC-1 showed a bactericidal activity against Salmonella typhimurium spread on the nutrient broth agar medium. These results suggest that the photosensitizers/photocatalysis under the light can remove some air pollutants and hence they can be used to reduce the exposure of the workers in the horticultural facilities and/or the public in the environment to the harmful pollutants.

• Proceedings of the KIPE Conference
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• 2000.07a
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• pp.501-504
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• 2000

In this paper the PC power supply is studied from the point of system stability. The power stage model of a multiple output forward converter with weighted voltage mode control is derived including all the major parasitic components and the small signal model is also derived. Determination of the weighting factors and a design procedure for the loop compensation are presented. Finally the model is verified through the simulation of three output forward converter with SABER.

• Journal of Acupuncture Research
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• v.30 no.2
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• pp.31-41
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• 2013

Objectives : This study was to evaluate inhibitory effects of Naegwan-acupuncture($PC_6$) on acute RE(reflux esophigitis) rat induced by pylorus and forestomach ligation operation. Methods : Twenty seven SD rats were divided three groups (intact normal rat; RE control rat; RE control rat respectively stimulated by Naegwan point($PC_6$)). All rats was fasted for 18 h but free water, we induced RE by pylorus and forestomach ligation operation. Six hour after the operation, rats were sacrified, collected bloods in the abdominal vein, dissected a esophagus and stomach. The stomach was washed a 1 ml PBS to research gastric volume, pH, acidity and mucin release of gastric juice, esophagus was cut longitudinally and pictured a innter mucosa area to research damages in esophagus. The proinflammatory cytokine and chemokine including IFN-${\gamma}$, TNF-${\alpha}$, IL-$1{\beta}$, IL-6 and MCP-1 were analyzed by ELISA kit. Results : 1. Significantly, death rate of $PC_6$ acupuncture rat group was decreased compared to that of RE control group. 2. Gastric Volume, gastric injury and esophageal mucosa demage were decreased significantly, too. 3. Compared with RE, all of the proinflammatory cytokine and chemokine analyzed in serum of $PC_6$ were decreased remarkably. Especially, there were significant meanings TNF-${\alpha}$, IL-6 and MCP-1 in serum of $PC_6$ were decreased. Conclusion : The results suggest that antiinflammatory and protecting effects of PC6 could attenuate the severity of reflux esophagitis and prevent the esophageal mucosal damage, and validate its therapeutic use in esophageal reflux disease.

• Proceedings of the KIEE Conference
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• 2005.07e
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• pp.106-108
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• 2005

본 연구에서는 산업용 패널(PANEL) 작업관리를 위한 보안 시스템의 한 예를 제안한다. 관리자 및 작업자, 작업 시작시간, 종료시간 및 모든 작업패널을 개별적으로 개폐 관리할 수 있으며 인증번호에 의하여 작업승인 제어가 가능하고 이상시 경보를 발령하도록 하며 HMI에 의해 감시기능을 갖추었다. 산업용 이더넷을 이용하여 PC 기반 패널보안시스템을 제작하여 제안한 시스템의 유용성을 제시하였다.