• Journal of the Korea Society for Simulation
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• v.8 no.2
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• pp.45-56
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• 1999

It is necessary that we should control the traffic to not only efficiently use the rich bandwidth of ATM network but also satisfy the users various requirements for service quality. However, it is very difficult to decide which control mechanism would be applied in real network because there are various types of ATM traffic and traffic control mechanisms. In this paper, a smart simulator is developed ot analyze the performance of a UPC(Usage Parameter Control) mechanism which is a typical traffic control mechanism. The simulator consists of a user interface that supports a menu-driven input form and a simulation program that is executed with the users input parameters. Especially, the simulator establishes more powerful and flexible simulation environment since it supports a more complex simulation applying various source traffic to several different UPC mechanisms at the same time and allows an arbitrary user-defined traffic in addition to some well-known traffic.

• Journal of the Korean Society for information Management
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• v.10 no.2
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• pp.87-109
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• 1993

Thls study attempts to determ~ne the c~tedness of a scient~fic research paper wr~tten/published In Korea, one of the scient~fically per~phrral countries and the citednes ot a Korean sc~entist In mathematlc and chemistry. It was found that there is a neglig~ble proportion of c~tatlons In papers by fore~gn scientists to scient~fic l~terature from Korean and Korean sc~ent~sts. Thus, it can be true that Korean sclence or sc~ent~sts make a relatively small contr~but~on to world science: however it 1s also true that the per~pehral journal has ~ t s own scientif~c value follocal area.

• English Language & Literature Teaching
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• v.16 no.3
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• pp.35-57
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• 2010

This study focuses on how prosodically and morphologically based OT constraints are implemented in voicing and place assimilations in English. It is revealed that prosodically based ID-ONS(V) applies to both assimilations except for assimilations occurring with irregular inflection morphemes. Morphologically based meta-constraint ranking, however, plays a role only in progressive voicing assimilation with regular inflection morphemes and regressive place assimilation with complex words. Thus, prosodically and morphologically based constraints are differently implemented in assimilation processes in English. The study shows that general faithfulness constraints should be decomposed into more specified constraints. It is also revealed that the general direction of assimilation is regressive in English and it might be reversed if morphological facts are involved in the process (Lombardi, 2001).

• Journal of the Korean Institute of Telematics and Electronics A
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• v.33A no.3
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• pp.47-54
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• 1996

In this paper we propose a new timing recovery method by means of utilizing service data filling rate instead of timing information of transmitter. A proposed algorithm controls the phase locked loop in the opposite direction ot data filling rate of FIFO in receiver, and it is based on the fact that average of cell jitters is zero. The proposed method is simple compared with timing information method of transmitter. It can be utilized for timing recovery in synchronous digital hierarchy as well as in plesiochronous digial hierarchy without common reference clocks in end-to-end erminals. We implement the interactive video communication system and test the proposed algorithm. As a result, we hav econfirmed that it yields good perfomrnces in terms of jitters characteristics and hardware complexity.

• Journal of the Korean Ceramic Society
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• v.33 no.12
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• pp.1325-1330
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• 1996

A new numerical method for determining the surface tension of a liquid drop by experimental measurement of the contour of the sessile drop is explained. in the present method a very simple and short computer program enables the calculation of surface tension in a few seconds even by a low speed personal computer. It need not the use of any other numerical tables or complex techniques. X and Z-corrdinates at one point on the contour of a sessile drop and the tangential angle at that point are all the data needed when the density of the drop is known. The results were compared with the values derived by a conventional method. This method can be used for the confirmation of measuring accuracy. Also the same concepts can be applied for the pendant drop method by changing only the sign of Z-coordinate from "+" to "-"ot; to "-"ot;-"quot.

• Polymer(Korea)
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• v.27 no.6
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• pp.555-561
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• 2003

The self-assembled monolayer coating of octadecyltrichlorosilane (OTS) on the silicon based MEMS was investigated and surface characteristics were considered as a function of coating conditions and reagent composition. The sulfuric peroxide mixture (SPM) solution was used to form -OH group which caused the hydrophilic characteristic on silicon surftce. Highest hydrophilicity was obtained by SPM solution with 85% acid content at room temperature. OTS was applied on the silicon surface by means of self-assembled monolayers (SAMs) coating. It was found that sol-gel reaction was took place between -OH group on the silicon surface and -Cl group in OTS. As a result, the contact angle increased due to the increase of hydrophobicity by Si-O bonding of SAMs. Sol-gel reaction could be controlled by coating conditions as well as reagent composition in OTS coating solution.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2022.11a
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• pp.137-139
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• 2022

As cyber threats in the maritime industry increase due to the digital transformation, the needs for cyber security training for ship's crew and port engineers has increased. The training of seafarers is related to the IMO's STCW convention, so cyber security training also managed and certified, and it is necessary to develop a cybersecurity training system that reflects the characteristics of the OT systemof ships and ports. In this paper, with the goal of developing a training model based on the IMO cyber risk management guideline, developing a cyber security training model based on the characteristics of maritime industry threats, and improving the effectiveness of cyber security training using AR/VR and metaverse, A method for developing a system for nurturing cyber security experts is presented.

• Journal of Families and Better Life
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• v.5 no.2
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• pp.163-176
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• 1987

This paper was designated to review consumer complaining in the context of consumerism . For the purpose of this study, the literature in the consumer satisfaction/ dissatisfaction, complaining and noncomplaining behavior was reviewed. A conceptual approach to understanding why consumers complain or not when the dissatisfied was presented. It was suggested that regardless of how dissatisfied a consumer is , an action is taken or forgone only after the costs and benefits of the various alternative are considered and an assessment of the probabilities of success are made. It was suggested that aroused citizens through consumer education, government agency's effort to reduce the consumer's dissatisfaction and seller's marketing strategy in the view of consumerism are three main propositions for the enhancement of the consumer's quality of life in this study. Consumer complaining must be made in virtue of national economic systems( standard of living and the effectiveness of its marketing system, extent of government control and provision of consumer assistances) to achieve high levels of efficiency. Besides national economic systems. the third parties must be promoted for the efficient consumer complaining.

• Review of KIISC
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• v.30 no.5
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• pp.13-23
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• 2020

주요 국가기반시설에 도입되어 운영 중인 산업제어시스템은 4차 산업혁명에 따른 디지털 전환으로 지능화됨에 따라 IT환경의 보안위협이 OT환경으로 상속되면서 제어시스템 보안위협 및 공격 양상도 복잡해지고 있다. 실제로 에너지분야 기반시설을 대상으로 한 Stuxnet, Conficker, BlackEnergy3 등 제어시스템 사이버 위협 및 사고 사례가 지속적으로 보고되고 있으나, 제어시스템을 대상으로 하는 사이버공격 대응을 위한 보안가시성 확보는 제대로 이루어지지 않고 있으며, 이를 위해서는 기존 IT 환경과는 다른 제어시스템의 특성이 반영된 보안 모니터링이 요구된다. 본 논문에서는 제어시스템 보안위협 지식 데이터베이스인 MITRE ATT&CK 프레임워크를 기반으로 제어시스템에 적합한 보안 모니터링을 수행하기 위한 요소들을 식별하고 방안을 제시한다.

• Resources Recycling
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• v.7 no.1
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• pp.41-49
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• 1998

This papcr covcrs ihe recovery process of aluminum coagulant by acidic exlraclion which can develop the dewaterability'of residual sludge solids and ihc reduclion ot sludge valumc and mass. Simultmeously, variables affecting acidic extaction of aluminum arc discussed It is represented that the characteristics of recovcrcd coagulant is assessed mth rcspcct to aluminum content. coagulalion effeaiveness, and trace contaminants. The treatment methods of residual sludge solid following acidic extraction arc also d~scussed. Fillally, we suggest some cases in which the results from laboratory can he applied to the fullscale operation and future domestic mosoect of it.