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무유도로켓 전기기폭장치 EMI 시험 방안 및 결과 고찰
최동수,전희성 국방기술품질원 2021 국방품질연구논집 Vol.3 No.1
This is the paper for electromagnetic effects evaluation of Electrically Initiated Device(EID) on the unguided rocket. The unguided rocket is consisted of fuse, warhead, and motor which contains EID. When the unguided rocket is installed in Armed Helicopter, safety critical issue occurred by unintended EID operation by electromagnetic effects on the Armed Helicopter. One of the explosion factor of the unguided rocket is mechanical impact more than 20G that is absolutely not related to electromagnetic effects. So, that factor wasn’t considered in this paper. In order to verify safety operation in Armed Helicopter, the EMI testing of unguided rocket including EID is tailored based on MIL-STD-461F. Firstly, test configuration considered by Armed Helicopter installation was decided. The unguided rocket is loaded in the rocket launcher and connected only launch connector without required 20G signal connector. Secondly, Emission test item of MIL-STD-461F was tailored due to the stand-by condition where is no electrical power or signal. Normal operation mode of the unguided rocket is stand-by mode, thus, power source is unnecessary for testing. During the test, unintentional EID operation didn’t happen. Therefore, there is found that ungudided rocket successfully passed the MIL-STD-461F test and is eligible for Armed Helicopter installation.
최동수 한국경영교육학회 2012 경영교육연구 Vol.27 No.4
This study is intended to compare the competition principles and deregulation policy trends of major developed countries (USA, Japan, UK, Germany, France, New Zealand) in the information communication industry, and to determine future implications for Korea’s information communication policy based on such comparison. In major developed countries’ deregulation policies regarding the information communication industry, they have promoted, in common, market liberalization-centric restructuring such as a separation of regulatory agency from a general administrative body and operating agency, the information communication business’ privatization, a relief of conditions for new entries, a combination of broadcasting and information communication, a change into price ceiling and an inducement of foreign capital. On the other hand, as to the differences in major developed countries’ deregulation processes, the USA and UK have introduced and strengthened competition, New Zealand has promoted a universal removal of regulations, and Japan has an asymmetric regulation against NTT. Considering the aforementioned developed countries’ information communication environment, South Korea should promote the liberalization (privatization and marketization) by deregulation for growth of the information communication industry. As one of methods for responding to the global information communication environment, South Korean information communication carriers also should actively support such environment through a development of new business and partnerships and cooperation with developed countries in information communication, as well as technology development. The introduction of competition into the information communication system, a reform of information communication business structure and the formation of a fair competition environment among information communication carriers which have been promoted for an opening of the information communication market will seem to give rise to improving the competitiveness of the domestic information communication industry. 본 연구에서는 주요 선진국(미국, 일본, 영국, 독일, 프랑스, 뉴질랜드)의 정보통신시장에서의 경쟁원리의 도입과정과 규제완화 정책동향을 비교하고, 이를 토대로 우리나라의 정보통신정책에의 시사점을 모색하는데 그 목적이 있다. 먼저 주요 선진국의 정보통신산업 규제완화정책에 대한 공통점은 규제기관과 일반 행정기과 및 사업운영기관의 분리, 정보통신사업체의 민영화, 신규진입조건의 완화, 방송·정보통신의 융합, 가격상한제으로의 전환, 외자도입 등 시장의 자유화를 중심으로 구조조정을 추진하고 있다. 반면, 주요 선진국의 규제완화과정에서 나타난 차이점을 살펴보면 미국, 영국 등은 경쟁의 도입·강화, 뉴질랜드는 규제의 전면적 철폐, 일본은 NTT에 대한 비대칭적 규제를 하고 있다. 이러한 선진국의 정보통신환경을 고려해 볼 때 우리나라 역시 정보통신산업의 발전을 위해 규제완화에 의한 자유화(민영화 및 시장화)를 추진하고, 또한 세계의 정보통신환경에 대응하기 위한 방법의 일환으로 우리나라의 정보통신사업자는 기술개발뿐만 아니라 신규 사업의 전개 및 통신선진국과의 제휴와 협력관계를 통해 적극적으로 대처해 나가야 할 것이다. 그리고 정보통신시장의 개방에 대비하여 추진했던 정보통신사업경쟁체제도입, 정보통신사업구조 개편, 정보통신사업자간 공정경쟁 환경조성 등이 국내 정보통신사업의 경쟁력 강화라는 결실로 맺어지게 될 것이다.
이론적 열유동 해석을 이용한 농산물 저장 및 유통 스마트 유닛로드 컨테이너의 통기공 최적화 설계
최동수,김용훈,김진세,박천완,정현모,김기석,Jong-Min Park 한국포장학회 2022 한국포장학회지 Vol.28 No.3
Air distribution occupies an important position in the smart unit load container design process for agricultural products. Inner air may be uncomfortable because of its temperature, speed, direction, and volume flow rate. It doesn't matter how efficient the ventilation equipment is if the air is not distributed well. The main aim of this study was to design the inlet and outlet fan locations of smart unit load container for agricultural products. A numerical study was performed on the effects of the location of inlet air and outlet air in relation to the container cooling sources on air distribution and thermal comfort. A concept of combining inner container cooling sources with the exhaust outlet was employed in this investigation. Also, in this research, the developed CFD (Computational Fluid Dynamics) models were thoroughly validated. This system was adopted for use in container spaces, where the exhaust outlet was located. In this study, the location of the inlet was derived through CFD for a container with a size of 1,100×1,100×1,700 mm, and it was derived that the inlet was located at the center of the lower part of the container for efficient air flow. It was efficient to position the outlet through the air inlet in the center of the lower part of the container at the top of the same side.