• 한국전자통신학회논문지
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• 제11권12호
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• pp.1187-1192
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• 2016

수중 MANET의 설계, 구축 및 운용에서 전송성능의 측정 및 분석은 네트워크 차원의 전송 파라미터를 중심으로 수행됨에 따라 성능 분석 결과가 네트워크 수준의 성능에 국한되고 있어 사용자 수준의 전송품질과 관련한 전송성능을 분석 고찰하기에는 미흡한 점이 있다. 본 논문에서는 수중 MANET에서 네트워크 수준의 전송성능 분석의 단점을 보완하고자 사용자 수준에서 요구되는 응용트래픽 관점에서 전송성능을 분석한다. 수중 MANET에서 활용도가 증가할 것으로 예상되는 음성트래픽을 대상으로 전송성능을 분석하고, MOS, CCR 및 EED 등의 음성 전송품질 요구조건에 적합한 수중 MANET 조건을 제시한다. 본 연구는 NS-2를 기반으로 구축된 컴퓨터 시뮬레이션을 사용하여 수행하며, 음성 트래픽으로는 VoIP 규격을 사용한다.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2003년도 춘계종합학술대회
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• pp.749-752
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• 2003

HLA(High Level Architecture)는 미 국방성에서 제안한 분산 시뮬레이션을 위한 실시간 분산 데이터 공유를 위한 객체, 시간, 인터페이스 규격을 말한다. 이 HLA는 (1) Rules, (2) Interface Specification, (3) Object Model Template 둥의 3가지 구성요소로 정의되며, 인터페이스 명세를 구현한 것이 RTI(Run-Time Infrastructure)이다. RTI는 분산 운영체계가 응용 프로그램에게 서비스를 제공하는 것과 유사한 방법으로 Federation을 구성하고 있는 Federate들에게 상호연동에 필요한 서비스를 제공한다. 모든 서비스들이 표준에 적합하게 구현되었는지 테스트하기 위한 방법은 DMSO에서 제안한 RTI를 검증하기 위한 2단계 과정을 통해 테스트된다. 본 논문에서는 1단계 테스트를 위한 테스트 절차와 그 방법에 대해 논한다 테스트 결과를 토대로 각 영역에서 DMSO에서 제안한 Level One Test Procedures에 따라 RTI가 Interface Specification에 적합하게 구현되었는지 확인하며, 각 단계마다 올바른 명령과 예상된 결과가 나오는지 테스트하기 위한 Test Suite를 개발한다.

• 한국안전학회지
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• 제33권1호
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• pp.142-147
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• 2018

This study aims to analyze and discuss the accidents based on the level of traffic culture (LOT). In pursuing the above, LOT are divided into three categories based on the standardized index of traffic culture. Also, this study focuses on developing the accident models using GLM (generalized linear model). The main results are as follows. First, the null hypotheses that the ratios of fatal and serious injured persons (FSI) are the same over categories are rejected. Second, as the common variables, the ratio of turn signal usage and elderly population are analysed to be impacted to the ratio of FSI. Third, the traffic culture indicators among 5 accident factors which give impact to 'high level' are judged to affect the reduction of FSI. Fourth, compared to other levels, the traffic law violations among 7 accident factors of 'medium level' are estimated to influence the increase of FSI. Finally, in 'low level', the increasing ratio of traffic culture index compared to that of previous year and the number of hospital beds per person are evaluated to be significant to reducing the ratio of FSI. This study can be expected to give some policy implications to regional traffic safety policy-making.

• Structural Engineering and Mechanics
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• 제64권2호
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• pp.195-204
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• 2017

Analytical and experimental studies of the innovative pipe in pipe damper have been recently investigated by the authors. In this paper, by adding lead or zinc infill or slit diaphragm inside the inner pipe, it is tried to increase the equivalent viscous damping ratio improving the cyclic performance of the recently proposed multi-level control system. The damper consists of three main parts including the outer pipe, inner pipe and added complementary damping part. At first plastic deformations of the external pipe, then the internal pipe and particularly the added core and friction between them make the excellent multi-level damper act as an improved energy dissipation system. Several kinds of added lead or zinc infill and also different shapes of slit diaphragms are modeled inside the inner pipe and their effectiveness on hysteresis curves are investigated with nonlinear static analyses using finite element method by ABAQUS software. Results show that adding lead infill has no major effect on the damper stiffness while zinc infill and slit diaphragm increase damper stiffness sharply up to more than 10 times depending on the plate thickness and pipe diameter. Besides, metal infill increases the viscous damping ratio of dual damper ranging 6-9%. In addition, obtained hysteresis curves show that the multi-level control system as expected can reliably dissipate energy in different imposed energy levels.

• 한국보건간호학회지
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• 제25권2호
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• pp.209-220
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• 2011

Purpose: The study investigated the level of mutual cooperation among those engaged in public and private nursing and social welfare to understand contributing factors. Method: The subjects were 289 nurses and 279 social workers. The level of mutual cooperation between nurses and social workers was evaluated. taking into account related personal factors and organizational environmental factors. Results: The level of mutual cooperation between nursing and social welfare organizations showed the following sequence, in decreasing order; public nursing, public social welfare, private nursing and private social welfare personnel. The factors affecting nurses' cooperation with social welfare personnel were expected duties, understanding of social workers' service, service autonomy, service appropriateness, and the training environment of the organization. Factors influencing the level of cooperation of social workers with nurses included understanding of nursing service, understanding of the efficiency gained by cooperation, service appropriateness and the training environment of the organization. Conclusion: The development of training programs to increase the level of cooperation between the nursing and social welfare fields is strongly recommended.

• Journal of Community Nutrition
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• 제8권3호
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• pp.127-133
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• 2006

This study attempted to investigate and compare the level of needs and expected benefits of information technology(IT) applications in restaurant operation from managerial and employee levels. Self-competence levels, education and training needs, and the company IT application levels were evaluated. The respondents for the study were the staff of full-service, mid-scale restaurants owned by a firm. Among the respondents, 17.6% were in managerial level(managers) and 82.4% were in employee level(employees). The results of this study indicated that compared to employees, managers perceived more in-depth that IT is beneficial and is needed in restaurant operation. Both groups rated IT as very much needed and beneficial to restaurant operation. However, managers rated their own technological competence significantly higher than the employees did. Both groups expressed the desire for IT training and education although the managers' needs were stronger than the other group. The company's IT application level was assessed by the managers and employees at a slightly higher than average score on a 5-point scale, showing no difference between the groups. The study findings show that the respondents perceived the IT needs and benefits than the present IT application level of restaurants, which suggests more IT applications be adopted to the restaurant operations.

• 자동차안전학회지
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• 제13권3호
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• pp.86-94
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• 2021

Since automated driving system (ADS) has great potential to innovate various fields of automobile and mobility industries, major countries are establishing safety standards for autonomous vehicles to support technology development. However, in order to prevent technology development from being hampered by the safety standards for technologies still under development, safety guidelines are applied until the technologies are mature. For example, the safety 'guideline' for level 4 ADS was published in December 2020 by the Ministry of Land, Infrastructure and Transport of Korea, while the safety 'standards' for level 3 ADS was promulgated in December 2019. In this study, the domestic safety guideline for level 4 ADS is analyzed with the guidelines of major advanced countries in terms of safety elements. As it takes a lot of time before the safety standards of level 4 ADS is introduced, it is expected that the safety guideline will be updated several times. As necessary considerations when updating the safety guideline, industry acceptance, harmonization between safety elements, validation methods of system performance, and the user options are discussed.

• Journal of Information Technology Applications and Management
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• 제28권1호
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• pp.1-12
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• 2021

The purpose of this study is to analyze the medical ecosystem in the post-corona era. In addition, this study introduces a new medical CRM model that allows primary-level hospitals to overcome the economic difficulties and to occupy a competitive advantage in the post-corona era. The medical environment in the post-corona era is expected to be changed by non-face-to-face treatment, reinforcement of public medical care, the transformation of a medical system centered on the primary-level hospitals, and the use of AI and big data technologies. The medical CRM model presented in this study emphasizes the establishment of mutual customer relationships through close information exchange between patients, primary-level hospital, and the government. In the post-corona era, primary-level hospitals should not simply be approached as private hospital pursuing profitability. These should be reestablished as the hospitals that can provide public health care services while ensuring stable profitability.

• 아태비즈니스연구
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• 제12권4호
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• pp.253-270
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• 2021

Purpose - The main purpose of this study is to measure and evaluate the level of national liabilities that Korea's national finances can afford. Specifically, the concepts of national debt and national liability are clarified, and the appropriate level of national liabilities is measured in terms of short-term fiscal crisis, mid-to-long-term fiscal crisis, and GDP. Based on these measurements of fiscal crisis, this study would like to propose national fiscal management plans. Design/methodology/approach - In order to clearly recognize the difference between the national debt and the national liability, this study examines the data from 2013 to 2020. In addition, this study uses data from the national financial statements from 2013 to 2018 to measure the appropriate level of national liabilities in terms of fiscal crisis management. Findings - Short-term fiscal crises, measured by current ratios, will not occur. Nevertheless, in view of the cash flow compensation ratio, the short-term bankruptcy of the national finances of Korea depends on the re-borrowing of short-term borrowings and current and long-term borrowings. In addition, in order to manage the mid-to long-term financial crisis, it is necessary to pay attention to the liability growth rate rather than the liability size. Research implications or Originality - While previous studies focused on the appropriate level of national debt, this study was differentiated as a study focused on the level of national liability coverage. It is expected that the results of this study will be used to manage the national fiscal soundness.

• 한국컴퓨터정보학회:학술대회논문집
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• 한국컴퓨터정보학회 2021년도 제64차 하계학술대회논문집 29권2호
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• pp.41-44
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• 2021

In this paper, we propose a monitoring system that can monitor gas leakage concentrations in real time and forecast the amount of gas leaked after one minute. When gas leaks happen, they typically lead to accidents such as poisoning, explosion, and fire, so a monitoring system is needed to reduce such occurrences. Previous research has mainly been focused on analyzing explosion characteristics based on gas types, or on warning systems that sound an alarm when a gas leak occurs in industrial areas. However, there are no studies on creating systems that utilize specific gas explosion characteristic analysis or empirical urban gas data. This research establishes a deep learning model that predicts the gas explosion risk level over time, based on the gas data collected in real time. In order to determine the relative risk level of a gas leak, the gas risk level was divided into five levels based on the lower explosion limit. The monitoring platform displays the current risk level, the predicted risk level, and the amount of gas leaked. It is expected that the development of this system will become a starting point for a monitoring system that can be deployed in urban areas.