• The KIPS Transactions:PartA
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• v.16A no.5
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• pp.381-388
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• 2009

The spread of wireless Internet technology development and applications with location information in the form of location-based services are becoming more diverse. In particular, where you recognize the location of objects such as people and things and to provide valuable services based on the ubiquitous and location-based services are emerging as an important service. The collision between the vehicle position measurement in this thesis and offers related service system. Used in the proposed system, the GPS PACKET with information about the location and time of collision for the vehicle crash, the vehicle consists of a NodeID. Cause a conflict between these data at the vehicle, the vehicle through the gateway from the server to decide whether to go on to determine that an emergency situation, Emergency Center, the location information and giving information about whether the conflict is measured. Also, for such an emergency, such as a family on the outside of the wireless terminal related to Wireless (PDA, Phone) is to let me know. The server to want to save the crash information to the database of configuration. Additionally, the proposed U-LBS system to verify the validity of the experiment was performed.

• The KIPS Transactions:PartD
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• v.9D no.3
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• pp.467-476
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• 2002

Importance of Information Systems in banking industry is higher than that of other industries. This study, based on a case study of a bank, analyzes the current status of information systems (IS) audit and proposes future directions in the area of IS control and audit. Major problems identified in the study include deficiency of IS and audit process, and inability of audit function to improve IS process. In addition, deficiency of staffing level and investment in R&D, and lack of competency and independence of audit staff are identified. In order to solve the problems, the following directions were proposed proper division of functions among audit related departments, utilization of outside audit function, and adoption of CSA, CAAT, career path program, risk-based audit approach. The results of the studs will provide valuable implications to banks and companies in other industries. Also the research framework employed in the study can be utilized in the future research in IS control and audit.

• Journal of the Korean Institute of Gas
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• v.13 no.6
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• pp.15-20
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• 2009

The number of compressed natural gas (CNG) vehicles have increased gradually by virtue of korea government's urban air quality improvement policy since 1998. Although the use of CNG as transportation fuel gives environmental benefits, there is a possibility of huge accidents from unexpected fire. Therefore, needs for the guarantee of safety are indispensible for the reliable operation of CNG vehicles. A check valve is a safety device which prevents leakage of the pressurized fuel charged in a fuel tank. Durability of this component should be guaranteed in spite of repeated operation. This research has performed durability tests of a CNG check valve regarding the repeated usage, extreme chattering, and the effect of compressor oil.Although a check valve used for CNG vehicle satisfies validation requirements in the test results, it has been found that problem in the function of leakage prevention in a check valve could take place in the case of prolonged exposure to compressor oil.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.4
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• pp.700-710
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• 2017

In the revision of the national curriculum, various creative activities and career activities are highlighted under the goal of fostering creative talent. Following the implementation of this policy, which is represented by creative activities, teachers are burdened with comprehensive responsibilities, such as planning and executing safety procedures and preventing accidents. Existing systems for teacher management had limitations that allowed only the provision of standardized information and management. The main purpose of this study is to help teachers manage their classes systematically through a class management system. The teachers' overall management system includes several functions, such as checking students' locations, registering students' reviews, or registering various kinds of activities for the creative experiential activities of the curriculum. This system not only helps teachers to systematically manage the creative experiential activities, but also allows teachers to share the history of their activities with each other. Furthermore, this system will be helpful in achieving the objectives of the revised curriculum.

• The Journal of the Korea Contents Association
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• v.19 no.10
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• pp.630-640
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• 2019

A series of recent events have laid the groundwork for discussions on the safety issues regarding production staff in the popular culture industry. In Korea, the standard contract has been pursued as a means of dealing with issues involving popular culture production staff. However, the existing standard contract failed to incorporate the characteristics and requirements in today's market, which greatly restricted its efficacy in real-world cases. Therefore, this study seeks to significantly improve the provisions in the standard contract that govern obligations between contractual parties, and the work safety of the production staff. To this end, considering the main causes of safety accidents and actual contracts, this study groups contractual provisions into several categories: the removal of adverse factors affecting optimal competency, factors causing individual staff's negligence, and external factors causing negligence. Then, this study proposes specific provisions to be included in each category.

• Proceedings of the Korea Water Resources Association Conference
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• 2016.05a
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• pp.21-21
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• 2016

인천 영종도는 물부족 위험평가 분석을 위해 Smart Water Grid연구단에서 선정한 데모플랜트로섬으로 고립된 지역이다. 영종도는 공촌정수장으로부터 상수도를 공급받고 있으며 관로 파손 등의 사고가 발생할 경우 외부 수자원으로부터 수도를 공급 받기 어려운 실정이다. 따라서 상수도 공급의 어려움이 발생할 경우 대체 수자원을 활용한 가용수량 산정과 이를 적용하기 위한 물수급평가 프로그램이 영종도에 적용 될 예정이다. 본 연구에서는 물수급평가를 위해 수문분석의 기초자료인 장래 예측 강수량을 제공하는 프로그램을 개발하였다. 장래 강수예측자료는 기상청 기상예보와 기후변화시나리오를 활용하였으며 Visual Studio2013을 통해 강수제공 프로그램을 개발하였고, 데이터의 저장과 DB서버 연동을 위해 Oracle 프로그램이 이용되었다. 기상청에서는 3일, 10일, 1달, 3달로 기간을 구분하여 강수확률 예보를 제공하고 있기 때문에 3개월 이내의 중 단기 예측은 기상청에서 제공되는 기상확률예보를 사용하였고, 3개월 이후의 장기 예측은 RCP 8.5시나리오에 의한 일단위 강수량이 활용될 수 있도록 하였다. 기상청 확률예보의 경우 퍼센트 확률을 정량적 수치로 환산하여 일단위 강수량으로 변환하여 제공하였다. 연구를 통해 개발된 강수제공 프로그램에서는 영종도 지역 내 행정구역 별 면적평균강수량이 제공되며, 기후변화시나리오에 의한 강수데이터 취득 시 고해상도(1km 격자단위)로 추출이 가능하도록 하였다. 사용자는 위 경도 좌표에 따라 일 및 월 단위의 강수데이터를 텍스트 파일 형태로 취득할 수 있고, 프로그램 화면 내 표출되는 그래프를 통해 현재대비 장래 강수량 변화를 확인할 수 있도록 하였다. 향후 Smart Water Grid 연구성과로 개발된 물부족위험평가프로그램과 연동하여 물수급평가, 가용수량 산정 등에 활용될 수 있을 것으로 기대된다.

• Journal of the Korean Society for Railway
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• v.11 no.6
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• pp.569-574
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• 2008

Catenary and Pantograph are used to transmit electrical energy to electric railways. Catenary (Overhead Contact Lines) should be installed precisely and managed for stable train operations. But external factors such as weather, temperature, etc., or aging affect catenary geometry. Changed catenary stagger and height cause high voltage spark or instant electric contact loss. Big spark derived from contact loss can damage the pantograph carbon strip and overhead contact lines that might interrupt the train operations. Therefore, to prevent a big scale spark or electric contact loss, catenary maintenance are required catenary geometry measurement systems with catenary maintenance capability. In this paper, we describe the development of catenary height and stagger measurement system. The catenary height and stagger measurement system uses Acuity company's AR4000 Laser Range Finder for distance measurement and AccuRange Line Scanner for degree measurement. This system detects suspicious overhead line sections with excessive stagger and height stagger variance.

• Nuclear Engineering and Technology
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• v.26 no.4
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• pp.493-501
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• 1994

An experimental study has been peformed on the pool-boiling critical heat flux (CHF) phenomenon on downward -facing plates. The CHF for inclinations of -90$^{\circ}$(horizontally downward position), -88$^{\circ}$, -86$^{\circ}$, -84$^{\circ}$, -60$^{\circ}$ and -40$^{\circ}$ were measured using plate-type test sections of 20mm 200mm and 25mm 200mm in a pool of saturated water under atmospheric pressure. The measured CHF was lower for the wider test section and decreased as its orientation approached to the horizontally downward position. The lower CHF can be attributable to the increased difficulty for the bubbles in escaping from the heater surface. When compared with the previous works, the overall trends were similar; however, a transition angle, at which the decrease rate in the CHF was changed, was observed in the vicinity of -80$^{\circ}$.

• The Journal of the Korea institute of electronic communication sciences
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• v.14 no.4
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• pp.651-656
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• 2019

This paper is a study on the structure system and implementation of cantilever actuator for decontamination. There are many kinds of exterior materials that attach to the exterior walls of a building. Glass, in particular, can be contaminated in a short period of time due to external exposure. The pollutants like this damage the appearance of a building. It can also cause health problems for users, and dust attached to solar panels creates problems that greatly reduce the power generation of solar panels. In order to remove such contaminants, professional workers usually remove contaminants attached to the outer walls. However, even with stability, accidents are often caused by a number of unexpected variables that occur in the field. Thus, to overcome these shortcomings, the cantilever actuator structure system was proposed. The system was designed through research. Then, we made a cantilever actuator and checked its operability. Finally, the effectiveness of the cantilever actuator was reviewed.

• Journal of Convergence for Information Technology
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• v.9 no.10
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• pp.9-15
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• 2019

Recently, in the field of next-generation e-commerce and finance, interest in blockchain-based technologies such as Bitcoin and Ethereum is great. Although the security of blockchain technology is known to be secure, hacking incidents / accidents related to cryptocurrencies are being issued. The main causes were vulnerabilities in the external environment, such as taking over login sessions on cryptocurrency wallets, exposing private keys due to malware infection, and using simple passwords. However, private key management recommends general methods such as utilizing a dedicated application or local backup and physical archiving through document printing. In this paper, we propose a white box password-based private key protection scheme. As a result of safety and performance analysis, we strengthened the security against vulnerability of private key exposure and proved the processing efficiency of existing protocol.