• 한국통신학회논문지
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• 제29권4C호
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• pp.454-460
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• 2004

본 논문에서는 Ka대역 초고속 위성방송 시스템에서 강우감쇠에 대처하면서 가입자에게 지속적으로 방송을 제공하기 위해 Unequal Error Protection(UEP) 방식을 이용한 계층적 부호화 방식에 대한 연구를 하였다. 신호의 중요도에 따라 변조 방식 및 채널 코딩 방식을 달리하는 time sharing 방식과 달리 하나의 변조방식을 이용하여 성상도 위치에서 신호의 중요도에 따라 신호간의 최소거리를 다르게 배치하는 UEP방식에 대한 구조 및 성능을 분석하였으며. 성능분석을 토대로 최적의 방식을 제시하였다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2000년도 춘계학술대회 논문집
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• pp.202-209
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• 2000

This paper introduces the main function and protection method of IGBT gate driver that designed by KOROS. Recently, the applications of insulated gate bipolar transistors(IGBTs) have expanded widely, particularly in the area of railway converters. This driver is suitable for railway traction applications, so they are designed for circumstance of railway vehicle such as vibration. The input control power for this driver is supplied from battery charger of railway. it is no necessary an isolated power supply board or auxiliary power supply, with substantial savings in cost and space in railway applications. This gate driver can be used wide range of input voltage. So, performance of the driver has no relation with the battery voltage(70V∼110V). The protection methods of IGBT gate driver have many kind of ways, but this gate driver it designed to apply to converter for railway system, so this gate driver includes protection for arm short current and low control power voltage, etc. And the process of protection method and protection reference value are optimized by means of sufficient test with our own facilities.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 B
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• pp.663-665
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• 2001

Generally, the owners of the facilities adopt CP(Cathodic Protection) Systems to protect the corrosion accidents previously. The developed countries have secured the standard of CP systems and its test methods through the various researches and consolidation of the rules. So, we have been studying the international standards; JSEC, NACE Standard, ASTM, DNV, Australian Standard etc. and standardizing the systems and its test methods to apply in Korea.

• 정보처리학회논문지C
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• 제12C권1호
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• pp.77-82
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• 2005

광 네트워크에서의 효율성과 안정성을 위해 보호 복구가 요구되면서 기존의 여러 보호 복구 방법들이 제안되고 있으며, 많은 연구가 진행되고 있다. 기존 연구 중에서 네트워크 토폴로지를 하나의 사이클로 구성하여 어느 한 링크가 손상되더라도 복구가 가능한 방법들이 제시되고 있다. 본 논문에서는 해밀턴 사이클(Hamiltonian cycle)을 이용하여 네트워크 토폴로지를 하나의 사이클이 아닌 몇 개의 다중 도메인으로 분리하여 장애 발생 시 해당 도메인 내에서 복구경로 설정이 가능한 알고리즘을 제안한다. 제안된 알고리즘을 시뮬레이션을 통해 분석한 결과 복구경로길이가 단일 사이클의 경우에 비해 $57{\%}$ 이상 감소함을 볼 수 있다. 즉, 다중 도메인으로 분리, 보호복구를 수행 할 경우 복구 용량의 증가는 크지 않으면서 고속 복구가 가능함을 확인할 수 있다.

• 임상간호연구
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• 제29권3호
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• pp.261-270
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• 2023

Purpose: This study aimed to identify the influence of knowledge of personal information protection law and nursing patient advocacy on practice of personal information protection among nurses. Methods: The subjects were 130 nurses who have worked for six months or more in the ward of the tertiary or general hospitals. Data were collected from February 20 to March 3, 2023. Results: Factors influencing practice of personal information protection were acting as an advocate (β=.32, p=.004), environmental and educational influences (β=.21, p=.040), knowledge of personal information protection law (β=.19, p=.013) and clinical experience for five years or more but less than ten years (β=.17, p=.036). The regression model showed an explanatory power of 34.0%. Conclusion: Acting as an advocate has the most effect on practice of personal information protection. To promote practice of personal information protection for nurses, it is necessary to provide education related to privacy protection and encourage nursing patient advocacy.

• International Journal of Railway
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• 제1권4호
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• pp.149-156
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• 2008

During maintenance or construction works in or at the tracks of railways, high risks for passengers and railway staff, especially for the workers on the construction site exist. The high risks result out of the movement of rail vehicles, like trains or construction vehicles, which must be faced by using any available technical and operational technologies for securing them against the environment. Therefore, it is necessary to evaluate the level of protection continuously and to identify new and innovative methods and technologies for the protection of the gang (construction worker, machines and material). Especially on construction sites at line sections with two or more parallel tracks but also with single tracks, there are still a lot of incidents and accidents mostly with seriously injured persons or fatalities. These were mainly gang members that breach the railway-loading gage. By using proper warning or protection systems, the avoidance of such accidents must be achieved. The latest developments. in gang protection systems concern on the one hand fixed barriers in the middle between the construction site and the operated track and on the other hand construction vehicles equipped with automatic warning systems. The disadvantage of such protection methods is that the gang can be warned against an approaching train but a monitoring of the gang members cannot be performed. Only one part of a potential dangerous situation will be detected. If the gang members will overhear the acoustic warning signal of the security staff and the workers will not leave the danger zone in the track, the driver of the approaching train had no chance to react to the dangerous situation. An accident is often inevitable. While the detection of acoustic warning signals by the gang members working on a construction site is very difficult, the acoustical planning of an automatic warning system has to be designed for an acoustic short range level of one meter besides the construction vehicle. The decision about the use of today's technical warning system (fixed systems, automatic warning systems, etc.) must be geared to the technical feasibility and the level of safety which is needed. Criteria for decision guidance to block a track should be developed by danger estimation and economical variables. To realize the actual jurisdiction and to minimize the hazards of railway operations by the use of construction vehicles near the tracks further developments are needed. This means, that the warning systems have to be enhanced to systems for protection, which monitor the realization of the warning signal as a precondition for giving a movement authority to a train. This method can protect against accidents caused by predictable wrongdoing. The actual state of the art technique of using a collective warning combined with additional security staff is no longer acceptable. Therefore, the Institute of Transportation System of the German Aerospace Center in Braunschweig (Germany) will develop a gang warning and protection system based upon imaging methods, with optical sensors such as video in visible and invisible ranges, radar, laser, and other. The advantage of such a system based on the possibility to monitor both the gang itself and the railway-loading gauge either of the parallel track or of the same track still in use. By monitoring both situations, the system will be able to generate a warning message for the approaching train, that there are obstacles in the track, so that the train can be stopped to prevent an accident. And also the gang workers will be warned, while they breach their area.

• 한국음향학회지
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• 제32권5호
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• pp.423-429
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• 2013

본 논문은 소음 속에서 다양한 청력보호구 착용 시 청자의 두개골 위에 골진동체 자극을 이용하여 가장 민감한 어음인지 부위를 찾고자 하였다. 20명의 정상청력의 남성과 여성(각 10명)에게 강강격의 이음절어를 사용하여 네 종류의 청력보호구 (이어폼, 이어플러그, 이어머프, 이어폼과 머프 동시 착용)와 다섯 군데의 골진동체 위치 (하악골각, 관절구, 관자놀이, 유양돌기, 정수리)를 네가지의 소음 방향(0, 90, 180, 270도)에 따라 어음인지역치검사를 시행하였다. 연구 결과는 다음과 같다. 1) 골진동체의 위치 중 관절구가 가장 역치가 낮았으며, 2) 청력보호구 종류는 이어폼과 머프를 동시에 착용(이중 보호) 하였을 때 가장 역치가 낮았다. 3) 소음 방향에 따라서는 90도에서 소음이 제시되었을 때 가장 낮은 역치를 나타냈으나, 4) 실험 대상자의 성별에 따라서는 유의미한 차이가 없었다. 따라서 소음성난청을 예방하며 소음 속에서 원활한 의사소통을 위해서는 이중보호 청력보호구 착용 하에서 관절구를 통한 언어전달이 가장 효율적이다.

• 인터넷정보학회논문지
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• 제15권5호
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• pp.133-139
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• 2014

오늘날 마이크로소프트사의 윈도우즈 운영체제는 가장 널리 사용되고 있고 인터넷 뱅킹, 게임 등 수많은 응용들에 널리 활용되고 있다. 윈도우즈 운영체제가 제공하는 커널 함수들은 실행되고 있는 임의의 프로세스들의 메모리 접근, 키보드 입출력 검사, 그래픽 출력 검사 등을 수행할 수 있기 때문에 많은 해킹 프로그램들이 이 기능들을 악용하여 메모리 해킹, 키보드 해킹, 불법적 게임 자동사냥 도구 제작 등의 목적으로 악용하고 있는 실정이다. 기존 보안 방식은 커널 데이터 구조나 커널 함수의 시작 부분의 변형을 검사하는 방식으로 해킹 프로그램의 존재 여부를 판별한다. 본 논문에서는 기존 보안 방법의 문제점을 지적하고, 이를 해결할 수 있는 새로운 방식을 제안한다. 이 방식은 시스템 서비스 디스패쳐 코드를 변형하는 방식으로 기본 보안 방식의 문제점을 보완할 수 있다. 이 서비스 디스패쳐 코드를 해킹 프로그램이 활용하게 되면 기존 보안 프로그램이 해킹 행위를 검출하지 못한다. 따라서 커널 데이터 구조나 커널 함수의 시작 부분뿐만 아니라 디스패쳐 코드의 변형 또한 보안 프로그램에서 검출해야 해야 한다.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2017년도 학술발표회
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• pp.329-329
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• 2017

In this study attempted to evaluate the stability of the protection methods by examining hydraulic characteristics of the area around the point in which marine cable protector is installed such as surf zone occurrence point of shore-end submarine cables suitable for coastal marine environmental conditions, flow rate t the tope of the protector and maximum wave height, and to provide basic data for the selection of the optimal protection method. In performing hydraulic model experiments, the topography of submarine cable installation location was reproduced in 2-D sectional channel, and models appropriate for experimental scale and similitude law were produced and installed for each condition of submarine cables and protectors. Since the topography and submarine cable protectors were reproduced and installed in 2-D sectional channel, the exact reproduction of surf and transformation in shallow water zone was possible, and thus the physical properties could be clearly analyzed. For stability review, an experiment to examine the stability was conducted using a wave maker with 50-year frequency design waves as target, and wave height and cycles were applied based on the approximate lowest low water level(Approx. L.L.W), which is the most dangerous in submarine cable protection methods. As for experimental time, typhoon passing time in summer (about 3 hours) was applied, and wave patterns and deviation ratio of the submarine cable protector were investigated after making irregular waves corresponding to design waves. In addition, current meter and wave height meter were installed at the installation location of the submarine cable protector, and the flow rates and wave height at the top of the protector were measured and analyzed to review hydraulic properties.

• Journal of Advanced Marine Engineering and Technology
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• 제17권1호
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• pp.55-65
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• 1993

Galvanic protection method is one the cathodic protection methods and is mostly used for corrosion prevention of heat exchangers and ship's hull. In this paper, it was investigated that how cathodic potential distribution was varied with according to the bare and painted steel plates in case of galvanic anode protection. The results obtained above were as follows. 1. Cathodic potential distribution of a painted steel plate was smoothed than that of the bare steel plate all over the cathodic surface area. 2. It was shown that polarization potential of the bare steel plate was somewhat shifted to negative potential, on the contrary that of the painted steel plate was somewhat shifted from negative potential to positive potential as time gone by beginning of galvanic anode method. 3. The applied current density in order to maintain constant protection potential(-770mv SCE) in the painted steel plate was less than that of the bare steel plate because of the high resistance polarization of the painted steel plate. 4. It was suggested that required number and life-time of anode for galvanic anode protection could be decided easily with corrosion prevention coefficient obtained by experimental data.