와이브로 환경에서 랩터 FEC 기반의 채널 적응형 비디오 전송 기법

김혜수,정재윤,변근영,남형민,고성제,Kim, Hye-Soo,Jeong, Jae-Yun,Byun, Keun-Yung,Nam, Hyeong-Min,Ko, Sung-Jea 한국전기전자학회 2009 전기전자학회논문지 Vol.13 No.4

와이브로 네트워크의 경우 무선 환경에서 높은 데이터 레이트를 제공하고 있다. 하지만 이러한 무선 환경에서 비디오를 전송할 때 패킷 손실과 핸드오프등에 의해 화질이 저하되는 문제가 발생하게 된다. 특히, 비디오 데이터는 패킷 손실에 의해서는 슬라이스 단위로 손실되고, 핸드오프에 의해서는 프레임 전체가 손실되는 현상이 발생한다. 이렇게 비디오 데이터가 손실이 되면 클라이언트에서는 에러가 지속적으로 확산되는 문제가 발생한다. 본 논문에서는 이러한 문제를 해결하기 위해서 랩터 FEC 기반의 채널 적응형 비디오 전송 방법을 제안 한다. 무선 채널의 패킷 손실에 의해 비디오의 화질 열화가 발생할 경우 서버는 채널 상황에 따라 FEC 레벨을 조절하여 비디오를 인코딩 한다. 또한, 단말의 이동 중 핸드오프에 의해 프레임이 손실될 경우 서버에서는 새로운 인트라 프레임을 만들어 에러가 확산되는 것을 방지하는 방법을 제안한다. 알고리즘의 성능평가는 실험을 통하여 보여주도록 한다 The packet loss and the disconnection during handoff are the most critical problems which degrade the video quality in wireless video streaming. To cope with these problems, we propose an efficient video streaming method in this paper, which does not only dynamically adjust the video transmission rate based on the raptor forward error correction (FEC) level, but also minimize the error propagation during handoff. Firstly, the channel bandwidth of the wireless broadband internet, called WiBro, is estimated by analyzing channel parameters including the carrier to interference and noise ratio (CINR) and the handoff. Secondly, the streaming server adjusts the next transmission rate according to the estimated channel bandwidth and the raptor FEC level to avoid packet error. Also, the encoder performs the intra refresh method that inserts an intra frame (I-frame) right after handoff to reduce the error propagation effectively. Experimental results indicate that the proposed method can improve the performance of the video streaming over WiBro network.

한국에서 사육중인 모돈 및 30, 60, 90일령 돼지의 돼지파보바이러스에 대한 혈청학적 역학조사

김혜수,박정서,오진식,박봉균,Kim, Hye-soo,Park, Jung-suh,Oh, Jin-sik,Park, Bong-kyun 대한수의학회 2001 大韓獸醫學會誌 Vol.41 No.4

A total of 701 swine sera from 55 swine farms (Mar, 1998 through Feb, 2001) were nation-widely collected for the presence of antibody to porcine parvovirus (PPV) in sows and 30-, 60-, 90-day-old pigs. Sero-prevalence by haemagglutination inhibition assay with guinea pig red blood cells was investigated on the basis of year, region and season, respectively. In general, there was no significant difference with gradual decrease of passive immunity for the sero-prevalence to PPV in sows and 30-, 60-, 90-day-old pigs for the period of 1999 and 2000. However, regional variation was observed in the provinces of Kyonggi, Choongnam and Kyungnam, Natural infection of the virus in 90-day-old pigs was increased during the fall and the winter. Thus, it seems that the natural infection of PPV in growing pigs may be attributed to the increased outbreak of postweaning multisystemic wasting syndorme in co-infection with porcine circoviruses.

외국인 이주민의 한국 웹드라마 수용 과정에 대한 탐색적 연구 : 2030 베트남 이주민을 중심으로

김혜수(Hye Soo Kim),김성태(Sung-Tae Kim) 글로벌문화콘텐츠학회 2021 글로벌문화콘텐츠 Vol.- No.48

본 연구는 베트남 이주민의 한국 웹드라마 수용 과정을 탐색적으로 알아보고 이민자 미디어 수용에 관한 연구의 저변을 확장하고자 한다. 20대와 30대 베트남 이주민을 대상으로 한 심층 인터뷰 결과는 다음과 같다. 첫째, 베트남 이주민이 한국 웹드라마를 시청하는 동기는 내국인과 다르게 한국의 이질적 문화를 이해하고 한국어를 학습하는 언어 학습 및 정보습득 의 이유가 대표적이었다. 그러나 베트남 문화와 이질적인 특성을 가지는 한국 문화임에도 한국 웹드라마는 공감할 만한 소재, 상황, 감정 또한 많이 포함됨으로써 베트남 출신 이주민의 공감을 이끌어냈다. 둘째, 내국인을 대상으로 한 기존 연구와 같이 출연진의 매력과 함께 썸네일과 O.S.T., 자막의 유무가 한국 웹드라마의 시청 여부에 영향을 주었다. 콘텐츠 외적으로는 순차적 편성과 이용의 용이성이 중요한 시청 동기였다. 셋째, 베트남 이주민의 한국 웹드라마를 처음 접하는 경로는 OTT 서비스 또는 준거집단 추천, 그리고 페이스북에서의 우연한 발견 등이었다. 페이스북에서 한국 웹드라마를 처음 접할 경우 첫 회나 예고편 영향만 제공되어 이후의 에피소드는 유튜브로 시청하는 양상이 발견되었다. 마지막으로, 참가자들은 한국 웹드라마에서 결말, 빠른 전개, 내용의 다양성이 개선되면 한국 웹드라마가 더 발전할 수 있다고 언급하였다. This study sought to explore the process of Vietnamese immigrants watching Korean web dramas and expand the foundation of insufficient immigrant media research. The results of in-depth interviews with 2030 Vietnamese immigrants are as follows. First, the typical motivation for Vietnamese immigrants to watch Korean web dramas was information acquisition of understanding Korea’s disparate culture and learning Korean. However, even though Korean culture is heterogeneous from Vietnamese culture, Korean web dramas have drawn sympathy from Vietnamese immigrants by including many sympathetic materials, situations, and emotions. Second, the presence of thumbnails, O.S.T. and subtitles, along with the charm of the cast, influenced the viewing of Korean web dramas. Outside of the content, sequential provision of the episodes and ease of use were motivations for watching. Third, Vietnamese immigrants first encountered Korean web dramas such as OTT services or recommendations from reference groups, and accidental discoveries on Facebook. When they first encounter Korean web dramas on Facebook, only the first episode or trailer video was provided in most cases, and subsequent episodes were found to be watched on YouTube. Finally, participants mentioned that Korean web dramas could develop further if the ending, rapid development, and lack of content improve in Korean web dramas.

농업폐기물/PLA를 이용한 바이오복합재료의 기계적 성질

김혜수(Hye-Soo Kim),이동우(Dong-Woo Lee),대니 자가디쉬(Dani Jagadeesh),A. 바라다 라주루(A. Varada Rajulu),송정일(Jung-Il Song) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.5-3

The focus in the present work is to study, a new type of agro-waste corn husk flour bio-filler as reinforcement for thermoplastic polymers. These materials have been created by extrusion and test specimens were prepared by injection molding. The effect of filler content (10, 20, 30, 40 wt %) and mesh sizes (50~100, 100, 300) on the mechanical properties was studied. Compared with wood flour and rise husk/PLA (30 wt%) and 100 meshes composites. The tensile strength, flexural strength and impat strength showed a decreasing trend with increase in the filler loading and increasing trend with the mesh size. In contrast, enhanced flexural modulus was observed with increasing filler loading and size. It can be concluded, from this study that the used agro-waste materials is an attractive reinforcement in manufacturing green composites from the standpoint of their mechanical properties. Water uptake increases with increasing fiber content.

개별 주문 생산에 의한 남성 재킷의 착의 평가 - 중년 비만 남성을 중심으로 -

김혜수(Kim Hye-Soo),이경화(Yi Kyong-Hwa) 가톨릭대학교 생활과학연구소 2002 생활과학연구논집 Vol.22 No.1

This study is to evaluate the production process and feeling to get dressed of the pattern of a formal jacket according to characteristics of a customer's physical figure which is not covered by ready-made clothes and thus is required individually ordered one. The experiment jackets were made to fit the body sizes of overweight middle-aged men subjects who were physical figure "LB" or "LBB" with body mass index over. 1.65 which means no ready-made clothes will fit them. Size fitness and wearing comfort of the experimental jackets by each alteration were evaluated. Alteration methods of jackets were different from each other according to the companies. For the subject who was "LBB" physical figure with thick belly and 181cm in height, the experiment jacket which was small in width between front bodice pattern and back bodice pattern came short of the standard of upside down triangle physical figure set by the National Institute of Technology and Quality, while it induced a better evaluation from the subject who had upside down triangular shape and "LB" physical figure and 173cm in height since he had broad shoulders and small waist to better fit in the experiment jacket with a small width between front and back pattern.

한국 성인의 3차원 두형개발을 위한 머리치수 연구

김혜수 ( Hye Soo Kim ),김진숙 ( Jin Sook Kim ),이경화 ( Kyong Hwa Yi ),박세진 ( Se Jin Park ) 대한가정학회 2005 Family and Environment Research Vol.43 No.6

Porphyromonas gingivalis에 대한 오리나무 줄기 추출물의 항균활성 및 생물막 형성 억제 효과

김혜수(Hye Soo Kim),조수정(Soo Jeong Cho) 한국생명과학회 2019 생명과학회지 Vol.29 No.12

본 연구에서는 천연물유래 구강건강소재로써 염료식물의 이용 가능성을 알아보기 위해 오리나무, 옻나무, 치자나무, 황칠나무, 황벽나무, 회화나무 줄기 추출물의 구강미생물에 대한 항균활성을 조사하였다. 6 종의 국내 자생 염료식물의 줄기에서 추출한 에탄올 추출물 중 오리나무 줄기 추출물(1 mg/disc)이 치주질환 원인균인 P. gingivalis KCTC5352에 대해 가장 우수한 항균활성을 나타내었다. 오리나무 줄기 추출물은 P. gingivalis KCTC5352에 대해 양성대조구로 사용한 chlorhexidine과 유사한 항균활성을 나타내었으며 P. gingivalis KCTC5352의 MIC는 0.4 mg/ml였고 MBC는 0.6 mg/ml였다. 오리나무 줄기 추출물이 0.2-2.0 mg/ml 농도로 처리된 배양액에서 P. gingivalis KCTC5352의 바이오필름 생성율과 세균 생육은 추출물의 농도가 증가할수록 저해되는 경향을 보였다. 또한 P. gingivalis KCTC5352의 superoxide dismutase (SOD)와 섬모에 대한 mRNA 발현도 추출물의 농도가 높아질수록 감소하는 것을 확인할 수 있었다. 이상의 결과를 종합하면 오리나무 줄기 추출물은 치주질환 원인균인 P. gingivalis KCTC5352에 대한 항균활성과 생물막 생성 억제능이 우수하기 때문에 천연물유래 구강건강소재로써 이용 가능성이 높을 것으로 판단된다. This study investigated the potential of dye plants as natural oral health products. The antibacterial activity of ethanol stem extracts of A. japonica, R. verniciflua Stokes, G. jasminoides, D. morbifera, P. amurense Rupr., and S. japonica against P. gingivalis KCTC 5352, S. mutans KCTC3065, S. downei KCTC3634, S. sanguinis KCTC3284, and S. gordonii KCTC 3286 was confirmed. Among the stem extracts from 6 dye plants grown in Korea, ethanol extract from A. japonica stem (1 mg/disc) showed the highest antibacterial activity against P. gingivalis KCTC5352. The A. japonica stem extracts showed antibacterial activity similar to chlorhexidine, which was used as a positive control. The MIC and MBC of P. gingivalis KCTC5352 were 0.4 mg/ml and 0.6 mg/ml, respectively. The biofilm production rate and cell growth of P. gingivalis KCTC5352 in the cultures treated with 0.2-2.0 mg/ml of A. japonica extract were significantly decreased in a concentration-dependent manner. In addition, the mRNA expression of the superoxide dismutase and fimA associated with fimbriae formation in these cultures was suppressed, also in a concentration-dependent manner. Based on these results, it is concluded that A. japonica stem extracts can be used as an oral health product derived from natural materials, as demonstrated by its antibacterial action against and inhibition of biofilm formation of P. gingivalis KCTC5352.

여대생의 얼굴형태 분석을 위한 계측적 연구

김혜수 ( Hye Soo Kim ),이경화 ( Kyong Hwa Yi ) 대한가정학회 2004 Human Ecology Research(HER) Vol.42 No.7

외국인 인권 보호 및 생활 적응을 위한 외국인 복지문화센터

김혜수(Kim, Hye-soo),이윤희(Lee, Yunhee) 한국주거학회 2019 한국주거학회 학술대회논문집 Vol.31 No.2

Gyeonggi Province ranks first among the percentage of foreigners residing in Korea, with 29,560 Sungnam taking sixth. Compared to the distribution of foreign residents, there is a lack of policies and facilities, and the human rights of foreigners living in Korea are also hard to be protected. The policy for the settlement of foreigners and the integration of society is awkward and they have the right to be recognized. As a result, it is possible to become a basic living beneficiary, and to improve the facilities and housing facilities that can enjoy the welfare + culture of foreigners in order to solve the human rights problems of foreigners and to solve the problem of adaptation to Korean life. The purpose of this study is to propose a welfare culture center for foreigners in Seongnam, Gyeonggi-do, which can solve the welfare + culture and housing problems for foreigners Welfare culture center was conducted in the following procedures and methods to protect human rights and adaptation of foreigners. First of all, the land was selected in Moran-ro, Jung-gu, Seongnam-si, Gyeonggi-do, which has a large proportion of foreigners but the welfare facilities are not operating properly. The facilities were located in the Foreign Welfare Center, Administrative Welfare Center, Taepyeong Station, Chinatown, etc. In addition, welfare and cultural centers and residential facilities were required for the welfare of foreigners. Therefore, the concept of nest was selected, and these facilities were complexed and laid out. In other words, after creating an entrance for communication with the outside, it is divided into three masses of the office residential complex center for separation by function, and arranged to provide various support. Designed an outdoor bridge. In addition, the plan was carried out to activate the outdoor plaza by activating the piloty to secure the large space by introducing natural light and refer to the Foreign Welfare Center When planning a welfare center for foreigners, the first thing to consider is to understand the current status and proportion of foreigners" residence and plan for appropriate facilities. In addition, it is necessary to identify the problems of the adaptation process that foreigners are experiencing in Korea and to plan programs and programs to support them. Based on this, the facilities and solutions that foreigners need should be presented. It is important to solve the problem by creating a base housing facility for self-reliance and contents that can support the life cycle of foreign residents. It will be able to promote revitalization, and above all, to ensure the happy lives of foreigners in Korea, the second home.

Streptococcus mutans에 대한 인도감나무 줄기 추출물의 항균활성 및 생물막 형성 억제 효과

김혜수(Hye Soo Kim),이상우(Sang Woo Lee),콩마니 시다래(Kongmany Sydara),조수정(Soo Jeong Cho) 한국생명과학회 2019 생명과학회지 Vol.29 No.1

본 연구에서는 천연물 유래 구강 건강소재로써 인도감나무 줄기 추출물의 이용 가능성을 평가하기 위해 TLC, TLC-bioautography, HPLC, ESI-MS 등을 이용하여 인도감나무 줄기 추출물로부터 S. mutans KCTC3065에 대해 항균활성이 있는 항균물질을 분리하고 주사전자현미경과 real-time PCR을 이용하여 추출물이 S. mutans의 생물막에 미치는 영향을 조사하였다. S. mutans에 대한 인도감나무 줄기 추출물의 항균활성은 극성이 낮은 n-hexane 분획물에서 확인되었고 TLC, TLC-bioautography, HPLC에 의해 분리된 항균물질의 분자량은 ESI-MS분석 결과 188로 추정되었다. 인도감나무 줄기 추출물(1 mg/ml) 처리에 따른 S. mutans의 바이오필름 바이오매스 변화는 주사전자현미경으로 관찰하였으며 추출물을 처리하지 않은 대조구는 추출물 처리구에 비해 세포가 군집을 이루고 모여 있었으며 세포 주변에서 바이오필름이 관찰되었지만 추출물을 처리한 처리구의 세포 주변에서는 바이오필름을 관찰할 수 없었다. Real-time PCR을 이용하여 바이오필름 생성 과정에서 치면 부착에 필수적인 GTFs의 발현양상을 조사한 결과, 인도감나무 추출물이 0.2-1.0 mg/ml의 농도로 처리된 배양액에서 gtfB 유전자 발현은 추출물의 농도에 따라 큰 변화가 없었지만 gtfC 유전자 발현은 추출물의 농도가 높아질수록 감소하는 경향을 나타내었다. 이상의 결과를 종합하면 인도감나무 줄기 추출물은 바이오필름 형성 단계에서 치아우식증 원인균인 S. mutans의 초기 치면 부착을 저해함으로서 바이오필름 생성을 억제할 수 있는 천연물 유래 구강 건강소재로써 이용 가능성이 높을 것으로 판단된다. The objective of this study was to evaluate the potential of Diospyros malabarica stem extract, a natural materials, in oral health material. With this aim in mind, thin layer chromatography (TLC), TLC-bioautography, high-performance liquid chromatography (HPLC), electrospray ionization–mass spectrometry (ESI-MS), scanning electron microscopy (SEM), and real-time qPCR were performed. The antibacterial activity of D. malabarica stem extract against Streptococcus mutans KCTC3065 was confirmed in an n-hexane fraction with low polarity. The molecular weight of the antibacterial compound was estimated to be 188 by ESI-MS analysis. The inhibitory effects of the extract on biofilm formation and gene expression related to biofilm formation of S. mutans were determined by SEM and real-time PCR analysis. The extract inhibited the formation of S. mutans biofilms at D. malabarica stem extract concentrations of 1 mg/ml, as shown by SEM. The real-time PCR analysis showed that the expression of the gtfC gene, which is associated with biofilm formation, was significantly decreased in a dose-dependent manner. Based on the above results, it can be concluded that D. malabarica stem extracts, a natural materials, can be used in oral health products to suppress the formation of biofilms by inhibiting tooth adhesion of S. mutans, a causative agent of dental caries.