http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
조대 Si입자분말을 사용한 질화반응 Si₃N₄의 치밀화 거동
문지훈,이주신 경성대학교 공학기술연구소 2000 공학기술연구지 Vol.7 No.-
Effects of sintering additives on the densification behavior of reaction-bonded silicon nitride(RBSN) prepared by using coarse 25μm Si powders are discussed. Densification near the theoretical density was attained by using the sintering additives such as 6wt%Y₂O₃+3wt%Al₂O₃+2wt%SiO₂(6Y3A2S) and 9wt%Y₂O₃+1.5wt%Al₂O₃+3wt%SiO₃(9Y1.5A3S). In the case of 6Y3A2S addition, high fracture strength of 960Mpa and fracture toughness of 6.5Mpa o m½ were obtained. Full densification and promotion of mechanical properties for preparating RBSN by using coarse Si powders will exert a benefical influence on a manufacturing process of silicon nitride ceramics.
임베디드 리눅스에서의 가상 SD 메모리 카드 시스템 설계
문지훈,오재철,Moon, Ji-Hoon,Oh, Jae-Chul 한국전자통신학회 2014 한국전자통신학회 논문지 Vol.9 No.1
SD memory cards are widely used in portable digital devices, and most of them exploit NAND flash memory as their storage, so that they have a feature of storing users' important data safely with low costs. In case of using NAND flash memory as storage, however, there is no method to store users' data if memory capacity is insufficient when transferring a large volume of data. This paper proposes a virtual SD memory card system. It used a SD memory card device driver to process data requested from a host by exploiting external storage rather than by exploiting flash memory as a memory core for storing data to the SD memory card. For experiment, it used the FPGA-based SD card slave controller IP on the SMC controller with a S3C2450 ARM CPU to test.
LTE-A 네트워크 환경에서 MTC를 위한 효율적인 접근관리 기법
문지훈,임유진 사단법인 인문사회과학기술융합학회 2017 예술인문사회융합멀티미디어논문지 Vol.7 No.1
최근 들어, 사물 인터넷 (Internet of Things)을 지원하기 위한 중요한 기술 중 하나로 고려되고 있는 MTC (Machine Type Communication)는 사람의 개입 없이 MTC 단말들에게 네트워크 연결을 제공하는 기술이다. 그러나 짧은 시간 내에 많은 MTC 단말들이 접속을 시도하는 경우, 제한된 통신 자원으로 인하여 자원 경쟁이 심화되고, 이로 인하여 단말의 접속 실패가 야기될 수 있다. 이러한 문제를 해결하기 위해서는 단말들의 통신 자원 접근을 분산시킬 필요가 있다. 본 논문에서는 LTE-A 환경에서 MTC 단말들의 효율적인 접근관리 기법을 제안한다. 먼저 특정 시간구간 동안 접속을 시도하는 단말 개수를 측정하고, 이를 기반으로 다음 시간구간 동안 접속을 시도할 단말 개수를 예측한다. 이러한 예측 개수를 기반으로 제안 기법은 통신자원 접근을 시도하는 단말 개수를 제어한다. 제안된 기법의 성능 증명을 위하여, 성공확률, 실패확률, 충동확률, 그리고 접속지연시간 측면에서 성능을 분석하였다. Recently, MTC (Machine Type Communication) is known as an important part to support IoT (Internet of Things) applications. MTC provides network connectivities between MTC devices without human intervention. In MTC, a large number of devices try to access over communication resource with a short period of time. Due to the limited communication resource, resource contention becomes severe and it brings about access failures of devices. To solve the problem, it needs to regulate device accesses. In this paper, we present an efficient access management scheme. We measure the number of devices which try to access in a certain time period and predict the change of the number of devices in the next time period. Using the predicted change, we control the number of devices which try to access. To verify our scheme, we conduct experiments in terms of success probability, failure probability, collision probability and access delay.
문지훈,오재철,Moon, Ji-Hoon,Oh, Jae-Chul 한국전자통신학회 2015 한국전자통신학회 논문지 Vol.10 No.5
In this paper, shared memory feature was developed in multi-core system with different OS for different processor-specific bus, while conducting an experiment on shared memory feature between the two processors based on embedded Linux system. For the purpose of developing shared memory in dual bus structure, memory controller was used, while managing shared memory segment through list data structure. For AMP multi-core test, Linux OS was installed in 2 processor cores. In addition, it verified the creation and use of shared memory by using kernel module implemented to test shared memory.