• Journal of the Korea Institute of Information and Communication Engineering
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• v.17 no.10
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• pp.2473-2478
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• 2013

The recently developed military system adopts System Engineering for quality insurance. The process of military system's development basically adopts specification(MIL-STD-499) and system engineering(ISO/IEC 15288) that was developed by America. Recently the level of company's capability maturity is granted by measurement and assessment for the level of CMM or CMMI that was developed by Carnegie Mellon University. This article introduces adopted range of process that developed military system adopted additional process of CMMI. This article writes a merit of process for military system's output that is developing device adopted diverse process.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2012.10a
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• pp.210-213
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• 2012

The recently developed military system adopts System Engineering for quality insurance. The process of military system's development basically adopts specification(MIL-STD-499) and system engineering(ISO/IEC 15288) that was developed by America. Recently the level of company's capability maturity is granted by measurement and assessment for the level of CMM or CMMI that was developed by Carnegie Mellon University. This article introduces adopted range of process that developed military system adopted additional process of CMM. This article writes range of process for military system that is developing device adopted diverse process in the future.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2014.11a
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• pp.235-236
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• 2014

인듐 주석 산화물 박막을 In/Sn (2, 5 wt.%) 합금 타겟을 사용하여 DC 마그네트론 반응성 스퍼터링법을 이용하여 증착하였다. 기판온도는 상온에서 증착하였으며, 증착 중 DC 파워는 70W부터 120W 까지 10W 단위로 증가시켜 증착하였다. 증착 된 박막을 대기중에서 후 열처리를 각 6, 12 시간 진행하여 전기적 특성을 평가하였으며 평가 장비는 Hall-effect measurements system을 사용하였다. ITO (Indium Tin Oxide) 박막의 비저항은 합금의 Sn 조성별로 다르게 나타났다. Sn 5wt.% 타겟을 이용한 경우에는 DC 파워 90W를 기준으로 더 낮은 파워에서는 열처리에 따라 비저항이 증가하였고, 더 높은 파워에서는 열처리를 한 경우 비저항이 더 낮게 나타났다. 이러한 결과가 나온 이유는, DC 파워가 높은 경우 스퍼터링 공정 중 발생하는 고 에너지 입자 충돌에 의해 산소가 re-sputtering되어 산소가 부족한 박막이 형성되기 때문인 것으로 판단된다. Sn 2 wt.% 타겟의 경우에는 큰 차이를 나타내지 않았으며, 이러한 원인은 Sn 함량이 적기 때문에 산소 공급으로 인해 결정성이 향상되더라도 활성화 Sn의 양이 적기 때문에 나타나는 현상으로 판단된다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2011.06a
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• pp.217-219
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• 2011

Smart Grid를 위해서 전기의 끊김없는 공급과 안전한 전기사용이 중요하다. Smart Grid에 사용되는 전기IT기기의 성능평가와 인증을 받기 위해서는 모듈 기준값, 모듈 성능값, 제품별 기능, 실험장비, 허용오차 등 실험 DataBase가 발생한다. 전기IT기기는, 기존의 존기기기에 IT와 통신기능을 융합하여 전기의 공급과 안전성을 강화시킨 제품이다. 본 논문에서는 Smart Grid DataBase 개발을 위한 전기IT기기들을 안전하게 관리하고, IT와 통신을 통한 인터넷 웹브라우저에서 접속할 수 있는 Java Servlet 기술을 이용한, 전기IT기기에 대한 평가기관 및 인증기관이 실시간으로 평가와 인증 자료를 관리 할 수 있도록 한다.

• Proceedings of the Korea Contents Association Conference
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• 2009.05a
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• pp.1141-1149
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• 2009

In Bone Mineral Density(BMD) measurements, accuracy and precision must be superior in order to know the small changes in bone mineral density and actual biological changes. Therefore the purpose of this study is to increase the reliability of bone mineral density inspection through appropriate management of image quality from machines and inspectors. For the machine management method, the recommended phantom from each bone mineral density machine manufacturer was used to take 10~25 measurements to determine the standard amount and permitted limit. On each inspection day, measurements were taken everyday or at least three times per week to verify the whether or not change existed in the amount of actual bone mineral density. Also evaluations following Shewhart control chart and CUSUM control chart rules were made for the bone mineral density figures from the phantoms used for measurements. Various forms of management became necessary for machine installation and movement. For the management methods of inspectors, evaluation of the measurement precision was conducted by testing the reproducibility of the exact same figures without any real biological changes occurring during reinspection. There were two measurement methods followed: patients were either measured twice with 30 measurements or three times with 15 measurements. An important point to make regarding measurements is that after the first inspection and any other inspection following, the patient was required to come off the inspection table completely and then get back on for any further measurements. With a 95% confidence level, the precision error produced from the measurement bone mineral figures produced a precision error of 2.77 times the minimum of the biological bone mineral density change (Least significant change: LSC). In order to assure reliability in inspection, there needs to be good oversight of machine management and measurer for machine operation and inspection error. Accuracy error in machines needs to be reduced to under 1% for scientific development in bone mineral density machines.

• Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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• 2004.11a
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• pp.245-249
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• 2004

최근에는 항측기에 GPS/INS 장비를 탑재하여 사진의 촬영과 동시에 외부표정요소를 직접 결정할 수 있는 Direct Georeferencing 기술의 개발로 인하여 지상기준점측량과 AT과정이 불필요하게 되었다. Direct Georeferencing 기법을 이용하게 되면 외부표정요소를 구하기 위한 전처리 과정을 생략할 수 있다. 따라서 지상기준점을 이용한 사진기 준점측량(AT)을 수행하지 않더라도 수치표고모델만 미리 확보되어 있으면 촬영과 동시에 수치정사사진을 생성할 수 있다. 본 연구에서는 촬영과 동시에 GPS/INS에 의해 획득한 외부표정요소와 항공사진을 이용하여 영상매칭에 의하여 수치표고모델(DEM)을 자동 생성하고, 이 결과를 바탕으로 정사사진을 제작하였다. 실제 도화데이터와 Direct Georeferencing 정사영상과의 오차를 평가한 결과, 표준편차가 X는 약 62cm, Y는 약 76cm 정도가 발생하였다. 이 결과는 축적 1：5,000 수치지도의 정확도 요구를 충분히 만족시킬 수 있는 양호한 결과임을 알 수 있다. Direct Georeferencing에 의한 정사영상의 제작방법은 큰 크기의 과대오차가 발생하는 부분을 수작업 또는 반자동으로 해결할 수 있으면 효율적으로 수치지도를 수정/갱신 할 수 있을 것으로 판단된다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2023.11a
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• pp.51-52
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• 2023

한국해양수산개발원(KMI) 조사에 따르면, 수상레저장비 중 하나인 전기 추진 보드류 (전동서핑보드, 전동웨이크보드, 전동패들보드 등)의 경제규모는 '28년도 까지 약 59억 달러까지 성장할 것으로 예측 될 정도로 급격한 성장을 하고있는 품목으로, 국내에서도 활발하게 제조, 수입, 유통 등이 이루어지고 있다. 하지만 성능 및 안전을 평가하는 정형화된 국내외 시험 표준이 전무한 실정으로, 시험 및 검사 없이 제조사의 자체 테스트에 의존하여 시장에 출시 되고 있다. 이에 신뢰성 있는 전기 추진 보드류 안전기준(안)을 개발 및 제시함으로써 제품의 품질 및 안전성을 향상시키고, 위해사고의 예방 및 국민의 건전한 수상레저활동 확보를 위한 기반을 조성하고자 한다.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.31 no.6
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• pp.1261-1266
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• 2021

Existing information security risk assessment methods focus on evaluating the vulnerability of information assets. However, when the form of information assets changes and new types of information assets emerge, there is a limitation in that the evaluation standards for them are also added or deleted. Existing methods have insufficient research on the path through which cyber threats are introduced. In particular, there is very little research on blocking the inflow path for web-based information systems with public IPs. Therefore, this paper introduces the main research contents of the BDLA (Blockade and Defense Level Analysis)-based information security risk assessment model. In addition, by applying the BDLA-based information security risk assessment model, the information security risk level was studied by measuring the blockade level and security equipment level of 17 public institutions.

• Fire Science and Engineering
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• v.33 no.2
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• pp.79-84
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• 2019

The use of emergency escape breathing devices (EEBD) is strongly required to protect against toxic gas or flooding caused by ship fires or accidents. Recently developed domestic EEBD products only satisfy the basic performance requirements, but no wear fit and activity performance evaluation has been done for real usage. In this study, the global level test requirements for wear comfort and activity of EEBDs were developed and the open and closed type of domestic EEBD products were evaluated. Poor visibility, longer wear time, breathing resistance, and hose obstruction in an open type and canister obstruction, weight unbalance, and an invisible black breathing bag in the closed type EEBD were estimated to be the main problems that need to be improved.

• Journal of Navigation and Port Research
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• v.29 no.6 s.102
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• pp.561-566
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• 2005

This study was carried out to amlyze and compare the stability of a 50ton container crane according to various wind load design codes. The wind load was evaluated according to 'The Specification of Port Facilities and Equipments / Specification for the design of crane structures (KS A 1627)' and 'Load Criteria of Building Structures' effected by the ministry of construction & transportation And the uplift forces qf a container crane under this wind load were estimated by amlyzing reaction forces at each supporting point and compared each other. From this study, we noticed that the design wind velocity criteria need to be defined specifically when the wind load is evaluated to design a container crane. And we verified the necessity of the estimation of the uplift forces at each supporting point to analyze a structural stability of a container crane and the maximum compressive force in order to consider the stability of the ground foundation of the berth.