Filter Driver 와 NAND FLASH Memory를 이용한 HDD 장치의 성능 개선에 관한 연구

김재경,김우길,김영길,Kim, Jae-Kyung,Kim, Woo-Gil,Kim, Young-Kil 한국정보통신학회 2011 한국정보통신학회논문지 Vol.15 No.8

본 논문에서는 NAND FLASH Memory를 HDD 의 Cache 로 사용하기 위해 I/O 용 Filter Driver의 구현을 제시 했으며, 이를 통해 HDD 저장장치의 느린 I/O 성능을 개선하기 위한 방법에 대해 연구했다. 반도체 부품으로서 빠른 I/O 성능을 보이는 NAND FLASH Memory이지만, 비싼 가격 때문에 HDD를 통째로 대체할 수 없음에서 본 개선 방법을 제안했다. 본 연구는 SSD의 빠른 I/O성능과 Filter Driver 의 Cache 관리 성능을 통해서 적은 비용으로 HDD의 높은 Performance를 이루어 냄을 목적으로 한다. In this paper, we research the method for HDD I/O Performance improvement by Filter Driver & NAND FLASH Memory. This paper was started from NAND Flash Memory can not be replaced by HDD because of high cost. So We consider that using NAND Flash Memory as cache for HDD. It can be achieved high HDD Performance through Filter Driver by low cost.

CAN 통신과 Smart Device를 이용한 차량 도난 방지 System

김재경,황만태,김영길,Kim, Jae-Kyung,Hwang, Man-Tae,Kim, Young-Kil 한국정보통신학회 2011 한국정보통신학회논문지 Vol.15 No.10

Smart Device Communications using the development of anti-theft system for vehicles have been investigated. because Progress of Smart Device If someone get the Key for Vehicle theft, he can be easily stolen vehicle. We thought about the concept of dual security devices. Using vehicle's identifier ID of CAN, when Comparing Smat phone identifier ID value and identifier ID received from the Can in the Head, If the same ID is compared. At this point after the activity of the vehicle's ACC On/Off the system allows the vehicle's ignition. 현재 도난방지를 위해 사용되는 방법은 Key를 이용한 방법, 원격 도어락과 차량 경보를 이용한 방법 등이 있다. 이 방법들은 차량의 Key를 분실할 경우 차량의 도난을 방지함에 있어 어려움이 있다. 그래서 본 논문에서는 Smart Device 와 CAN 통신을 이용한 차량 도난 방지 시스템에 대하여 제안한다. CAN의 차량 식별자 고유ID를 Head Unit에 보내고, Smart Phone을 통해 수신된 식별자 ID를 비교하여 동일한 ID 일 때 차량의 ACC(Accessory)를 on/off 하여 차량의 시동을 걸 수 있다.

한국산 버드나무류의 방사조직에 관한 연구

김재경,홍병화 ( Jae Kyung Kim,Byung Wha Hong ) 한국산림과학회 1984 한국산림과학회지 Vol.65 No.1

These studies were carried out to identify anatomical characteristics of ray parenchyma of xylem tissue of trunk in 6 species of Populus and 5 species of Salix which were grown in Korea. The results of these experiments were summarized as follows: In the type of ray parenchyma, Populus had uniseriate homogeneous ray tissue and Sahx had uniseriate heterogeneous ray tissue. Upright ray cells among uniseriate heterogeneous ray tissue in Salix were subdivided into rectangular type and square type. The minimum and maximum length of procumbent ray cells of Populus ranged 26.84 - 212.28μ and those of Salix were 46.36 - 170.80μ. However rectangular type of upright ray cell n Salix were 26.84 - 70.76μ and square type were 17.08 -43.92μ. The minimum and maximum width of procumbent ray cells of Populus ranged 12.20 - 24.40μ but those of Salix were 12.20 - 26.84μ. However, rectangular type of upright ray cell in Salix were 9.76 - 41.48μ and square type were 19.52-46.36μ. The height of ray parenchyma of Populus in tangential section ranged 65.88-14.80μ but Salix were 65.88-439.20μ. Ray parenchyma width of Populus ranged 4.88-24.40μ but those of Salix were 7.32-21.96μ. The number of ray parenchyma cells of Populus in tangential section were 3-26 cell, but Salix were 2-21 cells.

인출력 저감을 통한 SSD Test Gender의 장수명 설계

김재경,박형석,이기석,전의식,Kim, Jae Kyung,Park, Hyung Suk,Lee, Ki Seok,Jeon, Euy sik 한국반도체디스플레이기술학회 2020 반도체디스플레이기술학회지 Vol.19 No.4

Recently, the electronic equipment industry has become active due to the continuous increase in portable storage media with high-speed information communication, and in particular, the production of SSD(Solid State Drives) for miniaturization of mobile devices and high-speed information communication has increased rapidly. When the SSD is ejecting in the SSD test gender, the necessary ejecting force must be kept constant to have a lifespan applicable to the test device. When the ejecting force increased, it leads to wear of the link for ejecting, which causes a problem in that repeated durability decreases and the ejecting of the SSD becomes impossible. In this paper, the repeated durability test analysis according to the material and the reducing ejecting force design were performed to increase the life of the test gender for SSD inspection. The wear level of the pusher head and ejector was analyzed through repeated durability tests according to the material of the pusher head. The validity of the design was verified through the ejecting force test and repeated durability test of the Test gender, which was designed by carrying out the design to reduce the size and ejecting force of the test gender.

Works - SONG HOUSE

김재경,Kim, Jae Kyung 대한건축사협회 2022 建築士 Vol.640 No.-

탄화공정에서의 우분 반응속도 평가

김재경,이민석,이승희,Kim, Jae-Kyung,Lee, Min-Seok,Rhee, Seung-Whee 한국자원리싸이클링학회 2014 資源 리싸이클링 Vol.23 No.6

우분의 기본 특성과 우분 탄화물의 특성에 대한 검토를 통해 탄화도, 전환율, 반응속도 및 활성화 에너지에 대하여 고찰하였다. 우분 시료 자체의 저위발열량은 272 kcal/kg로 낮게 나타나 연료로써의 개질이 필요하므로 탄화공정을 이용하여 탄화물의 발열량을 4,300 kcal/kg 이상인 연료로 전환 하였다. 전환율은 반응초기인 10분까지 급격히 증가하였으며, 온도가 증가함에 따라 높게 나타났다. 우분 탄화공정에서의 반응속도는 1차식으로 나타내었으며, 빈도인자(A)는 $1.34{\times}10^{-2}min^{-1}$, 활성화 에너지는 5,196.4 cal/mol로 평가되었다. 반응속도 상수는 $250^{\circ}C$일 때 $0.0679min^{-1}$, $400^{\circ}C$일 때 $0.2107min^{-1}$로 온도가 증가함에 따라 반응속도도 증가하는 것으로 나타났다. 우분 탄화에서의 반응속도에 대한 평가한 결과, 탄화공정의 최적조건은 탄화온도 $350^{\circ}C$, 탄화시간 20분으로 나타났다. Through the study of the basic characteristics of cow manure and the characteristics of carbonization residue, carbonization degree, conversion rate, kinetic reactions, and activation energy for cow manure were examined. Since the heating value of cow manure was very low, it was converted to carbonization residue as a fuel with heating value of 4,300 kcal/kg by carbonization processes. Conversion rate was increased rapidly up to 10 minutes of the initial reaction stage and was increased with increasing temperature. The carbonization of cow manure could be described by the 1st order reaction. Frequency factor(A) of reaction rate for cow manure was evaluated to be $1.34{\times}10^{-2}min^{-1}$, the activation energy was estimated to be 5,196.4 cal/mol. As carbonization temperature increased from $250^{\circ}C$ to $400^{\circ}C$, the kinetic reaction was increased from $0.2107min^{-1}$ to $0.0679min^{-1}$. From the result of the carbonization for cow manure, it can be determined that the optimal conditions of the carbonization process were 20 minutes in carbonization time and $350^{\circ}C$ for carbonization temperature.

가스치환포장과 감마선조사 병용 처리한 최소가공 무의 미생물학적 안전성

김재경,조철훈,김현주,이주운,황한준,변명우,Kim, Jae-Kyung,Jo, Cheo-Run,Kim, Hyun-Ju,Lee, Ju-Woon,Hwang, Han-Joon,Byun, Myung-Woo 한국식품과학회 2005 한국식품과학회지 Vol.37 No.1

최소가공 무의 미생물학적 안전성을 확보하고 품질을 보존하기 위하여 가스치환포장과 감마선 조사를 병용 처리하여 4에서 2주간 저장하면서 일반 호기성 미생물, 대장균군, 젖산균 및 pH의 변화를 각각 조사하였다. 일반 호기성 미생물의 변화를 관찰한 결과 저장기간과 포장 방법에 관계없이 감마선 조사에 의해 유의적으로 줄어들었으며 처리 당일의 경우 2kGy의 방사선 조사에 의해 $CO_{2}$나 $CO_{2}/N_{2}$ 포장구가 함기 포장구 보다 유의하게 미생물을 감소하였다. 대장균군 역시 저장기간과 포장 방법에 관계없이 감마선 조사에 의해 유의적으로 줄어들었으며 젖산균도 저장기간과 포장 방법에 관계없이 감마선 조사에 의해 유의적으로 줄어들었다. pH의 변화에 있어서는 감마선 조사와 포장방법에 의한 유의한 차이를 보이지는 않았지만 가스치환포장을 하였을 때 pH가 낮아지는 경향을 보였으며 저장기간 동안 pH 증가하였다. 이러한 결과로 볼 때 최소가공 무의 미생물학적 안전성을 확보하고 품질을 보존하기 위해서는 2kGy의 감마선 조사와 가스치환포장의 병용처리가 효과적이라 사료된다. White radish was minimally processed, packed with air, $CO_{2}$ (100%), and $CO_{2}/N_{2}$ (25/75%), and irradiated at 0, 1, and 2 kGy, and its microbiological quality and pH were investigated during storage for 2 weeks at $4^{\circ}C$. Irradiation significantly reduced total aerobic, coli-form, and lactic acid bacteria counts. Modified atmosphere packaging (MAP) enhanced microorganism control during storage. Acidity decreased by MAP but was restored during storage, Irradiation did not affect sample pH. Results show irradiation at 2 kGy combined with MAP can enhance microbiological safety and quality of minimally processed radish.

FEM을 이용한 지지대 형상 및 배열에 따른 진공창 유리의 응력해석

김재경,전의식,김영신,Kim, Jae-Kyung,Jeon, Euy-Sik,Kim, Young-Shin 한국반도체디스플레이기술학회 2010 반도체디스플레이기술학회지 Vol.9 No.1

Windows are still the thermally weakest part in considering energy efficiency. The vacuum glazing is considered as a new alternative in terms of energy efficiency. Vacuum glazing are consisting of two separated glass, pillars are support the under and upper glass. Therefore in this paper suggested the pillar shapes and array arrangements method using Finite Element Method and validity were proved by comparing and analyzing with the research that it is announced through the existing experiment. It is considered to solve pillar shapes and arrangement method problem of the vacuum glazing using proposed FEM analysis.

재난상황을 대비한 환승센터 내 대피경로선정 알고리즘 개발

김재경(Kim, Jae-Kyung),이영인 대한교통학회 2012 대한교통학회 학술대회지 Vol.66 No.-

아바타 행위 시나리오 생성을 위한 계층적 객체 및 스크립트 언어 모델

김재경(Jae-Kyung Kim),손원성(Won-Sung Sohn),임순범(Soon-Bum Lim),최윤철(Yoon-Chul Choy) 한국멀티미디어학회 2008 멀티미디어학회논문지 Vol.11 No.1