백서의 일과성 국소허혈-재괄류 모델에서 U-74389G와 MK-801이 뇌경색 크기에 미치는 효과

김재일,김종민,양대웅,이근호,윤병우,노재규,이상복 대한신경과학회 1999 대한신경과학회지 Vol.17 No.1

Bluetooth Ad hoc 망에서 멀티 슬롯 SAR-QT 알고리즘을 고려한 WAP 패킷의 성능 분석

문일영,노재성,조성준 한국항행학회 2002 韓國航行學會論文誌 Vol.6 No.2

본 논문은 Bluetooth환경에서 SAR-QT(Segment And Re-assembly Quick Transfer)알고리즘을 사용하여 WAP (Wireless Application Protocol)성능을 향상시키기 위한 ,WAP패킷의 전송 시간을 분석하였다. 이러한 WAP의 전송 능력을 향상시키기 위한 한 방법으로 SAR-QT의 과정은 WTP (Wireless Transation Protocol)상위 계층에서 내려온 전체 메시지를 분할한 다음, 베이스밴드에서 패킷을 전송하게 된다. 그리고 Bluetooth 패킷 타입중의(Data-Medium rale) 1, DM3, DM5, 에 따른 WAP over Bluetooth의 패킷 전송 시간을 분석하였다. 이 SAR-QT 알고리즘은 멀티 슬롯으로 전송할 경우 L2CAP (Logical Link Control And Adaptation Protocol)베이스밴드 패킷 전송 시간을 감소 시킨다. 결과로부터, WAP over Bluetooth 환경에서 WAP 패킷의 전송 시간을 줄이기 위해서 WP패킷 크기가 증가해야 한다는 점을 알 수 있었다. 또한, 이러한 무선 채널을 고려한, Rician 페이딩 환경에서 WAP over Bluetooth의 적당한 패킷 크기를 구할 수 있었다. In this paper, it is analyzed that WAP pachket transmission time to improve performance of WAP using SAR-QT algorithm in Bluetooth channel. The order for SAR-QT algorithm to improve the transfer capability, it is fragmented in WTP total messages that are coming down from upper layer and then the packets are sent one at time in baseband. And it is studied that transmission time for WAP over Bluetooth according to DMI, DM3 or DM5 packet type using SAR-QT algorithm in Bluetooth piconet environment. This SAR-QT algorithm decreases WAP packet transmission time of L2CAP baseband packets by sending packet that are spanning multiple slots. From the results, in WAP over Bluetooth channels, it is found out that WTP packet size ougth to be increased to decrease transmission time of WAP packet. In addition, considering BER in wireless channel. optimal WTP packet size is achieved for WAP over Bluetooth in a Rician fading environment.

외력진동수가 리츠해석법에 미치는 영향

예광일,박중석,노필성,김재웅 동아대학교 건설기술연구소 1998 硏究報告 Vol.22 No.1

The fact that with appropriate selection of the Ritz shapes, only a few of them can be used to represent adequately the response of the original system can be utilized very effectively in the forced response analysis of multi-degree-of-freedom systems. Obviously, a desirable set of Ritz vectors will be one that can adequately represent the spatial distribution of load by the superposition of a minimum number of shapes. It has been demonstrated that dynamic analysis based on Ritz vectors, which are generated by taking into account the spatial distribution of the load yield results which are more accurate than the use of the same number of exact mode shapes. However, because the dynamic response is influenced strongly by the exciting frequency, the exciting frequency in the use of Ritz analysis method is of considerable importance. In this paper, the influence of exciting frequency on Ritz analysis method is compared with mode superposition method with respect to displacement errors and base shear errors.

播種期 및 育苗日數가 黃色種 담배의 初期生育 및 收量에 미치는 影響

申周植,盧載榮,裵吉寬,朴相一 충북대학교 엽연초연구소 1984 煙草硏究 Vol.11 No.-

This experiment was carried out to study the influence of different sowing time, seedling age (the degree of delayed setting) and seedlingbed materials on the growth and yield components of flue-cured tobacco. The variety applied was N.C. 2326, was sown on March 1,11,21 and 31. Those plants were transplanted on the seeding bed mixed humus with sand at the ratio of humus 9 : sand 1 and humus 3: sand 7, 25 days after sowing. Seedlings were grown for 40, 50, 60 and 70 days (from sowing to setting) on the seed bed and seedling bed, and set on the pots (1/5,000a) in the vinyl house. The results obtained were as forlows . 1.The amount of growth of seedlings increased by late sowing and delayed setting. 2.Until the time before the maximum growth stage after setting, stem heigth was larger in the plots of late sowing and delayed setting. After the middle part of maximum growth stage, the earner the sewing time was, the more remarkable the influence of seedling age on the stem elongation was and the larder the seedling age was, the more remarkable the influence of sowing time on the stem elongation was. 3.Stem diameter was large in the plot to late sowing until the early part of maximum growth stage but after the middle part of maximum growth stage the diameter was large in the plants sown at March 11 and March 21. 4.The number of leaves per plant increased by late sowing and delayed setting shown significant difference after maximum growth stage. 5.Late setting made the stem height high and number of leaves per plant more. The size of largest leaf was small in the plot of early sowing and large in the plot set after May 10. 6.It takes more days to reach a topping time from sowing and setting in the case of early sowing and early setting. 7.In early sowing plots, the leaf area of lugs and cutlers decreased by younger seedling age, and in late sowing plots, that decreased by older seedling age. The leaf area of leaf and tip at different treatments showed similar results, but in the plots sown at March 11 and 21, largest leaf was shown in the plot of 50- day seedlings. The area of green tip decreased by late seeding and delayed setting. As a result of theses the plant type showed sylindrical in the plot of early sowing and younger seedling age, and cone shape in the plot of late sewing and older seedling age. 8.The earlier the sowing time and the younger the seedling age were, the heavier the weight of unit leaf area of lugs and cutters, but there were little influences of different sowing time and seedling age on the weight of unit leaf area of leaf, tip and green tip. The percentage of dry matter showed similar tendency to the results of weight of unit leaf area. 9.Late sowing (March, 31) decreases the weight of a cured leaf. Weight of cured cutter was largest in the plots sowing March 1 and that of leaf tip and green tip was largest in the plots sowing March 11 and March 21. The weight of cured lugs was largest in 40 and 50-day seedlings, and that of tip and green tip was largest in 50-day seedlings. There were little differences of weight of a cutter and leaf among the treatments of different seedling age. 10.In 40- day seedlings, the area and weight of leaves per plant increased by late sowing, and in 70-day seedlings, those increased by early sowing. In 50 and 60-day seedlings, those were highest in the plots sown at March 11 and March 21. Largest weight and area of leaves per plant was shown in the plot set on May 10, and the plots set on April 10, and June 1 showed significantly low weight of loaves per plant. 11.Late sowing and older seedling age increased the leaf thickness of those leaves. Different sowing time and the seedling age did not influence on the leaf area contraction ratio and leaf thickness of leaf, tip and green tip. 12.There were significantly negative correlation between leaf area of lug and cutter and weight per unit leaf area, percentage of dry matter and leaf thickness of the lug and cutters, but no correlation between those characters of leaf, tip and green tip. Weight per unit leaf area correlated positively with percentage of dry matter and specific leaf weight in all stalk position. In the lug and cutter, weight per unit leaf area correlated positively with leaf thickness and negatively with leaf area contraction between weight per unit leaf area and leaf area contraction ratio. There were negative correlation between leaf thickness and leaf area contractions of lugs and cutters, and no correlation between those characters of leaf, tip and green tip. 13.There were not significant effects of seedling bed materials applied in this experiment on the growth after setting and yield components.

일부 산모에서 산모혈, 제대혈, 모유 및 태반에서의 환경 에스토레겐성 화합물(PCBs) : Environmental estromgen compounds(PCBs) in Maternal Blood, Cord Blood, Human Milk and Placenta of Korea women

이강숙,임현우,노영만,구정완,조재천,박정일,김진홍 가톨릭대학산업의학센타 산업의학연구소 2003 韓國의 産業醫學 Vol.42 No.2

The production and intensive use of organochlorine chemicals, both in agriculture and industry, have led to wide spread contamination of the environment. There may be biological effects of organochlorine contaminated breast milk even when levels are below those concentrations that are currently regarded as tolerable. To evaluate the exposure of to fetus PCBs, we measured the sum of 13 congeners of PCBs in maternal blood, cord blood, breast milk and placenta of 30 Korean women by gas chromatograpy/electron capture detector. The concentration of total PCBs of maternal blood, cord blood and breast milk were 7.16±4.29 ㎍/ℓ, 5.16±3.12 ㎍/ℓ, 1.77±2.87 ㎍/ℓ respectively and they have no significant correlation. PCBs in placenta was not defected. However there were no significant differences of PCBs according to age, education, body mass index, parity, breastfeeding, smoking and drinking.

한국인 직무 스트레스 측정도구의 개발 및 표준화

장세진,고상백,강동묵,김성아,강명근,이철갑,정진주,조정진,손미아,채창호,김정원,김정일,김형수,노상철,박재범,우종민,김수영,김정연,하미나,박정선,이경용,김형렬,공정옥,김인아,김정수,박준호,현숙정,손동국 大韓産業醫學會 2005 대한직업환경의학회지 Vol.17 No.4

Background and Purposes: Over the past three decades, numerous studies performed in Korea have reported that job stress is a determinant risk factor for chronic diseases and work disability. Every society has its own culture and occupational climate particular to their organizations, and hence experiences different occupational stress. An occupational stress measurement tool therefore needs to be developed to estimate it objectively. The purpose of this study is to develop and standardize the Korean Occupational Stress Scale (KOSS) which is considered to be unique and specific occupational stressors in Korean employees. Subjects and Methods: Data were obtained from the National Study for Development and Standardization of Occupational Stress (NSDSOS Project: 2002-2004). A total of 12,631 employees from a nationwide sample proportional to the Korean Standard Industrial Classification and the Korean Standard Occupational Classification were administered. The KOSS was developed for 2 years (2002-2004). In the first year, we collected 255 items from the most popular job stress measurement tools such as JCQ, ERI, NIOSH and OSI, and 44 items derived from the a qualitative study (depth interview). Forty-three items of KOSS, in the second year, were retained for use in the final version of the KOSS by using Delphi and factor analysis. Items were scored using conventional 1-2-3-4 Likert scores for the response categories. Results: We developed eight subscales by using factor analysis and validation process: physical environment (3 items), job demand (8 items), insufficient job control (5 items), interpersonal conflict (4 items), job insecurity (6 items), organizational system (7 items), lack of reward (6 items), and occupational climate (4 items). Together they explained 50.0% of total variance. Internal consistency alpha scores were ranged from 0.51 to 0.82. Twenty-four items of the short form of the KOSS (KOSS-SF) were also developed to estimate job stress in the work setting. Because the levels of the subscales of occupational stress were gender dependent, gender-specific standard norms for both the 43-item full version and the 24-item short form using a quartile for the subscales of KOSS were presented. Conclusion: The results of this study suggest that KOSS might be an appropriate measurement scale to estimate occupational stress of Korean employees. Further and more detailed study needs to be conducted to improve the validity of this scale.

CRISPR-Cas9-mediated generation of obese and diabetic mouse models

Roh, Jae-il,Lee, Junghoon,Park, Seong Uk,Kang, Young-Shin,Lee, Jaehoon,Oh, Ah-Reum,Choi, Dong Joon,Cha, Ji-Young,Lee, Han-Woong KINOKUNIYA CO LTD 2018 EXPERIMENTAL ANIMALS Vol.67 No.2

<P>Mouse models of obesity (<I>ob</I>/<I>ob</I>) and diabetes (<I>db</I>/<I>db</I>) in which the leptin (<I>Lep</I>) and leptin receptor (<I>Lepr</I>) genes have been mutated, respectively, have contributed to a better understanding of human obesity and type 2 diabetes and to the prevention, diagnosis, and treatment of these metabolic diseases. In this study, we report the first CRISPR-Cas9-induced <I>Lep</I> and <I>Lepr</I> knockout (KO) mouse models by co-microinjection of Cas9 mRNA and sgRNAs that specifically targeted <I>Lep</I> or <I>Lepr</I> in C57BL/6J embryos. Our newly established <I>Lep</I> and <I>Lepr</I> KO mouse models showed phenotypic disorders nearly identical to those found in <I>ob</I>/<I>ob</I> and <I>db</I>/<I>db</I> mice, such as an increase in body weight, hyperglycemia, and hepatic steatosis. Thus, Cas9-generated <I>Lep</I> and <I>Lepr</I> KO mouse lines will be easier for genotyping, to maintain the lines, and to use for future obesity and diabetes research.</P>

Severe Gastro-esophageal Reflux Disease during antiangiogenic therapy (초)

( Jae In Ryu ),( Hye Kyung Jung ),( Ju Young Choi ),( Sun Hee Roh ),( Chung Hyun Tae ),( Seong Eun Kim ),( Ki Nam Shim ),( Tae Hun Kim ),( Sung Ae Jung ),( Kwon Yoo ),( Il Hwan Moon ) 대한내과학회 2010 대한내과학회 추계학술대회 Vol.2010 No.-

Proxy Backoff Scheme for Mobile IP over OFDM WLAN

Il-Young Moon,Jae-Sung Roh,Sung-Joon Cho 한국통신학회 2002 한국통신학회 학술대회논문집 Vol.2002 No.11

Performance Evaluation of IEEE 802.11 MAC DCF Protocol for Wireless LANs

Il-Young Moon,Jae-Sung Roh,Sung-Joon Cho 한국통신학회 2003 한국통신학회 학술대회논문집 Vol.2003 No.11