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        • KCI등재

          HCCA의 CF-Poll 피기백 알고리즘의 성능평가

          이현진,김재현,조성현,Lee Hyun-Jin,Kim Jae-Hyun,Cho Sung-Hyun 한국통신학회 2006 韓國通信學會論文誌 Vol.31 No.9B

          HCCA에서 채널 예약 정보를 가진 CF-Poll 프레임을 QoS-Data 프레임에 피기백하여 채널 효율성을 향상시키도록 하였다. 그러나 망 내의 하나의 QSTA라도 물리계층 전송속도가 감소할 경우 CF-Poll 프레임을 피기백한 QoS-Data 프레임은 가장 낮은 물리계층 전송속도를 가진 QSTA에 맞추어 전송해야 한다. 따라서 물리계층 전송 속도가 낮을 때 CF-Poll을 피기백하는 것은 지연을 증가시킬 뿐만 아니라 전체 망 성능을 감소시킬 수 있다. 본 논문에서는 이러한 현상을 QSTA의 채널전송속도 저하에 의한 피기백 문제라고 정의하였으며, 이러한 문제에 의한 성능 감소를 평가하였다. 시뮬레이션 결과로 CF-Poll을 피기백했을 때 임의의 QSTA의 물리계층 전송속도가 낮으면 지연이 최대 25% 증가하였다. 반면 물리계층 전송속도가 높을 경우 지연이 최대 7.8% 감소하는 것을 알 수 있었다. 또한 지연의 측면에서 서비스 트래픽 부하에 따라 전체 QSTA의 최저물리계층 전송속도가 24에서 36Mbps 이상일 때 CF-Poll 피기백의 이득이 발생하는 것을 발견하였다. A CF-Poll frame which contains the channel reservation time can be piggybacked in QoS-Data frame to increase the channel efficiency in HCCA. However, if any QSTA in the network uses the low physical transmission rate, the QoS-Data frame which includes the CF-Poll frame must be transmitted by the minimum transmission rate. Therefore, it can cause the decrease of the channel efficiency and the increase of the frame transmission delay for other traffic streams when any QSTA has the low physical transmission rate. In this paper, we define this phenomenon as the piggyback problem at the low physical transmission rate and evaluate the effect of this problem. In the simulation results, when a CF-Poll piggyback is used, the delay is increased about 25% if any QSTA has the low physical transmission rate, while the delay is decreased about 7.8% if all QSTA has the high physical transmission rate. We also found that the gain of the CF-Poll piggyback mechanism is achieved when all QSTA has higher physical transmission rate than 24 or 36Mbps.

        • KCI등재

          경사지 활용 저층 집합주택의 개발가능성과 경사도별 모델 제안

          이현진,양우현,Lee, Hyun-Jin,Yang, Woo-Hyun 한국주거학회 2009 한국주거학회 논문집 Vol.20 No.1

          This research starts from the questioning of current housing development on the hilly site in Korea. It aims to investigate various design techniques of low-rise housing as an alternative housing plan on hilly sites. Several generic solutions of the combination of building type and road pattern are tested for a simulation process, and evaluated in terms of crucial design issues; development density, parking space and open space. As a result, four reasonable models are selected for making full use of geographical features of hilly site, two models each land slope of $18^{\circ}$ and $26^{\circ}$. Several design techniques for each model are also suggested, in ensuring the development feasibility by considering land slope, vehicular access and parking, common open space, and community facilities.

        • SCOPUSKCI등재

          응집된 Y<sub>2</sub>O<sub>3</sub>:Eu Red 형광체의 나노분산 및 나노졸의 형광특성

          이현진,반세민,정경열,최병기,강광중,김대성,Lee, Hyun Jin,Ban, Se Min,Jung, Kyeong-Youl,Choi, Byung-Ki,Kang, Kwang-Jung,Kim, Dae Sung 한국재료학회 2017 한국재료학회지 Vol.27 No.2

          Nanosized and aggregated $Y_2O_3:Eu$ Red phosphors were prepared by template method from metal salt impregnated into crystalline cellulose. The particle size and photoluminescent property of $Y_2O_3:Eu$ red phosphors were controlled by variation of the calcination temperature and time. Dispersed nanosol was also obtained from the aggregated $Y_2O_3:Eu$ Red phosphor under bead mill wet process. The dispersion property of the $Y_2O_3:Eu$ nanosol was optimized by controlling the bead size, bead content ratio and milling time. The median particle size ($D_{50}$) of $Y_2O_3:Eu$ nanosol was found to be around 100 nm, and to be below 90 nm after centrifuging. In spite of the low photoluminescent properties of $Y_2O_3:Eu$ nanosol, it was observed that the photoluminescent property recovered after re-calcination. The dispersion and photoluminescent properties of $Y_2O_3:Eu$ nanosol were investigated using a particle size analyzer, FE-SEM, and a fluorescence spectrometer.

        • SCOPUSKCI등재

          Fe<sub>2</sub>O<sub>3</sub>가 코팅된 판상 mica의 적외선 반사용 적색안료 제조 및 차열도료의 열특성

          이현진,김대성,이승호,임형미,최병기,강광중,정재일,조금성,Lee, Hyun Jin,Kim, Dae Sung,Lee, Seung-Ho,Lim, Hyung Mi,Choi, Byung-Ki,Kang, Kwang-Jung,Jeong, Jae Il,Cho, Kum-Sung 한국재료학회 2015 한국재료학회지 Vol.25 No.2

          $Fe_2O_3$ coated plate mica($Fe_2O_3$/mica) for infrared reflectance red pigment was prepared under hydrothermal treatment. $Fe_2O_3$ was perfectly coated on mica via the difference of surface charge between $Fe_2O_3$ and mica particles at pH 3. $Fe_2O_3$/mica was then calcined at $800^{\circ}C$ to stabilize the coated layer on mica. The infrared(IR) reflectance pigments were characterized by X-ray diffraction, FE-SEM, zeta potential, and a UV-Vis-NIR spectrophotometer. In particular, the CIE color coordinate and IR reflectance properties of $Fe_2O_3$/mica pigments were investigated in relation to the thickness variation of the $Fe_2O_3$ layer coated on mica of various lateral sizes. The isolation-heat red paints containing the pigments were prepared and optimized with a thinner, settling agent, and dispersant. Then, the films were made. The thermal property of isolation-heat on these films was observed through the relationship of the IR reflectance value, which was based on the variation of the $Fe_2O_3$ layer's thickness coated on mica and mica's lateral size as IR reflectance pigment. With an increase in IR reflectance on these films, the thermal property of isolation-heat was effectively enhanced.

        • 한국형 사이버 위협 정보 공유 기술 및 발전 방향

          이현진,조학수,Lee, Hyun-Jin,Cho, Harksu 한국정보보호학회 2021 情報保護學會誌 Vol.31 No.5

          사이버 보안 위협은 점차 은밀화·고도화되고 있어 단일 솔루션으로 탐지·분석이 어렵고, 파편화된 정보만으로 대응하는 데 한계가 있다. 이에 대응하기 위하여 글로벌 보안업체들은 CTA를 구성하여 신속 위협대응 체계를 구축하고 있다. 국내에서도 이에 발맞추어 다수의 보안 업체 및 기관들이 협업하여 2017년부터 3년간 Security Analytics 기반의 이기종 보안 솔루션 위협 분석 및 대응 기술 개발 과제를 수행하였다. 본 논문에서는 해당 과제의 수행성과 중 CTI 및 정보 공유 체계를 중심으로 정리하고 이를 통해 도출된 시사점과 현재 진행 방향을 정리하고자 한다.

        • KCI등재

          군용차량 방탄재 최적화에 관한 연구

          이현진,최재식,김근원,신기수,Lee, Hyun-Jin,Choi, Jae-Shik,Kim, Geun-Won,Shin, Ki-Su 한국군사과학기술학회 2013 한국군사과학기술학회지 Vol.16 No.4

          During the land operations, the enemy's gunnery is the primary threat. For the military vehicle, the bulletproof effect is the one of the important issues regarding the safety of soldiers on duty. Recently, the advanced military vehicles have planned to install armor plates. However, due to the budget problem, it is difficult to equip the protection systems. Hence, the optimum approach to increase bulletproof capability is essential. In this paper, the optimum thickness and component of the armor of military vehicles were evaluated by using finite element analysis for bullet impact effects. To achieve this aim, 7.62mm NATO bullet, 1.6mm steel and Kevlar-29 composite have been modeled and the simulations were conducted with various thickness cases by using MSC Nastran sol 700. Consequently, it was revealed that Kevlar-29 45 Layer is appropriate thickness for 7.62 bulletproof. Furthermore, Kevlar-29 in front of steel was effective by comparison with the back of steel for bulletproof.

        • KCI등재

          임플란트 수술 시의 합병증; 증례 보고

          이현진,여덕성,임소연,안경미,손동석,Lee, Hyun-Jin,Yeo, Duck-Sung,Lim, So-Yeon,An, Kyung-Mi,Sohn, Dong-Seok 대한구강악안면외과학회 2007 대한구강악안면외과학회지 Vol.33 No.2

          According to the increase in use of implants in clinical dentistry, new kinds of complications happen. Complications that can happen during implant placement are bleeding, nerve injury, jaw fracture, fenestration of maxillary sinus or nasal cavity, dehiscence, fenestration, injury of adjacent tooth. And complications that can happen after implant operation are infection, bleeding, hematoma, chronic sinusitis, peri-implantitis. Problems that are confronted during implant placement happen by inadequate preoperative treatment plan, inadequate consideration about individual anatomic difference, inadequate operation process and lack of experience of clinician. It is important that clinicians consider possible complications in advance and make a comprehensive treatment plan. We report the patient who was happened ramus fracture during block bone harvesting from ramus of severely atrophic mandible, the patient who came to emergency ward due to postoperative swelling and bleeding and the patient whose implant was migrated to maxillary sinus with a review of literature.

        • KCI등재

          반하사심탕 혈맥약침이 흰쥐의 CINV(Chemotherapy-Induced Nausea and Vomiting)에 미치는 영향

          조영권(Young-Kwon Cho),이찬(Chan Lee1),이현진(Hyun-Jin Lee),임윤경(Yun-Kyoung Yim) 대한한의학회 2017 대한한의학회지 Vol.38 No.1

          Objectives: This study aimed to investigate the effect of banhasasim-tang intravenous herbal acupuncture (BST-IVHA) on emesis induced by chemotherapy in rats. Methods: This study used methotrexate(MTX)-induced Rat-Pica model. The rats were randomly allocated into seven groups; normal group, two saline groups, four Banhasasim-tang(BST) groups (groups treated with BST-IVHA). All the experimental animals except those in the normal group were injected with MTX. Those in the pre-treatment groups were treated with saline injection (saline group) or BST-IVHA (BST group) before MTX injection. Those in the post-treatment groups were treated with saline injection or BST-IVHA after MTX injection. Two different dosages of BST-IVHA solution (low dose; BST-1 group, high dose; BST-2 group) were used. The changes in body weight, food intake, and kaolin consumption at 24h, 48h, and 60h were monitored and analyzed. Results: 1. No significant change was found in body weight. 2. The food intake at 48h was increased significantly in the BST-1 pre-treatment group(19.89±0.01g) compared to the pre-saline group(18.68±0.26g). 3. The kaolin consumption was significantly decreased in the BST-1 pre-treatment group at 24h(0.24±0.02g) and 60h(0.36±0.14g), in the BST-2 pre-treatment group at 48h(0.02±0.01g) and 60h(0.80±0.31g) compared to the pre-saline group(24h:0.81±0.37g, 48h:0.76±0.43g, 60h:1.56±0.03g). The kaolin consumption was also significantly decreased in the in the BST-1 post-treatment group at 24h(0.05±0.02g), 48h(0.64±0.06g) and 60h(0.14±0.05g), in the BST-2 post-treatment group at 48h(0.01±0.01g) and 60h(0.01±0.01g) compared to the post-saline group(24h:0.51±0.4g, 48h:3.58±0.33g, 60h:2.5±0.2g). Conclusions: BST-IVHA showed an anti-emetic effect in MTX-induced rat-pica model. This result suggests that BST-IVHA could be an effective treatment for chemotherapy-induced emesis.

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