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류승석,정연모 경희대학교 산학협력기술연구원 1996 산학협력기술연구논문집 Vol.2 No.-
The Data Encryption Standard(DES), known as the Data Encryption Algorithm, has been a worldwide standard for 20 years. Although it is showing signs of an old age, it has held up remarkably well against years of cryptanalysis and is still secure against all but possibly the most powerful of adversaries. In this paper, the DES is modeled in VHDL and simulated. Hardware implementation gives much better performance than software approaches.
류승석,오재곤,정연모 慶熙大學校 1998 論文集 Vol.27 No.-
Since data security problems are very important in the information age, encryption algorithms have been studied for a long time. The GOST(Gosudarstvennyi Standard or Government Standard) algorithm as a data encryption algorithm with a 256-bit key is a 64-bit block algorithm developed in the former Soviet Union. In this paper, we describe how to design an encryption chip based on the GOST algorithm. In addition, the GOST algorithm is compared with the DES(Data Encryption Standard) algorithm which has been used as a conventional data encryption algorithm in modeling techniques and their performance. The GOST algorithm whose key size is relatively longer than that of the DES algorithm, has been expanded to get better performance, modeled in VHDL, and simulated for implementation. In addition, the algorithm was implemented with a FPGA chip. Finally how to use the encryption chip in HDTV design for image protection is presented.
유재현,박승조,윤철중 東亞大學校 1999 東亞論叢 Vol.36 No.-
This study is the removal of nitrogen in the tannery wastewater by modified intermittent aeration process. The experiment was performed with the tannery wastewater of J industry complex located in Pusan. The reactor volume used for experiment was 114.24l as pilot scale. The performance of this process was evaluated by variation of wastewater temperature with 30, 20, 15℃. On operating with wastewater at 30℃ the removal rate of total nitrogen and NH₃-nitrogen were about 93% and 98% respectively. NO₂-nitrogen and NO₃-nitrogen were contained with 20~30mg/L in intermittent and nitrification reactor but those were reduced with 10mg/L in effluent by denitrification bacteria. By the way on operating with wastewater at 20℃ and 15℃ the removal rate of total nitrogen was 97%, 95% respectively. Because of change of operating condition it was prevented the reduction of activity of microorganism temperature down.
착화제와 유기산이 Wistar rat체내의 Sr 분포에 미치는 영향
이기호,이제호,박상윤,이승훈,유용운,윤택구 대한방사선 방어학회 1990 방사선방어학회지 Vol.15 No.2
Wistar rat에 85SrCl2를 꼬리 정맥에 주사하여 체내 기관과 혈액 내 분포, 잔존율을 조사하였고 착화제와 유기산을 투여하여 혈장 단백질에 결합하는 Sr양의 변화를 측정하였다. 혈액내에서 Sr은 혈장에 60%, 세포에 40%부착되어 이동하였다. 혈장에 존재하는 Sr중 약 50%정도는 혈장 단백질과 결합한 상태였고, 세표에는 세포 표면에 가볍게 부착되어 있었다. Erythrocyte나 granulocyte보다 lymphocyte에 많은 양의 Sr이 부착되어 있었다. 투여후 초기 1시간 이내에 혈액 내에서 급격히 감소하여 뼈에 침착되었다. 이때 각 기관에서도 Sr의 잔존율은 24시간 이내에 크게 감소하였고, 뼈로 침착된 Sr은 24시간 이후에 서서히 감소하였다. 착화제 EDTA, EGTA 및 DTPA를 투여한 경우, 혈장 단백질에 결합하는 Sr의 양은 대조군의 57%에서 27-33%로 감소하였으며 citrate 및 oxalate의 투여시는 이값이 19%와 40%로 각각 감소하였다. 85SrCl2 was injected to the tail vein of Wistar rats and investigated its distribution and clearance in the tissues and blood. We also measured the changes in Sr binding to the blood plasma protein by administrating chelating agents and organic acids. For the blood, 60% of the Sr occurred in the plasma and 40% on the cell membrane. Fifty percent of Sr in the blood plasma was bound to plasma protein. Sr on the cell membrane seemed to be bound loosely. The binding in the lymphocyte was higher than in the erythrocyte and granulocyte. Within one hour Sr was quickly disappeared from the blood stream, to be accumulated in the bone. Twenty four hours after the injection, Sr decreased rapidly in the organs of soft tissue, but slowly in the bone. The binding of Sr to plasma protien decreased from 57% of the control to 27-33% in the group treated with chelating agents. EDTA. EGTA and DTPA and to 19% and 40% in the groups treated with organic acids, citrate and oxalate, respectively.
A Pediatric Case of Toxic Hepatitis Induced by Hovenia Dulcis
Yun Ji Kim,정혜림,Seung Lok Ryu,Jae Won Shim,Duk Soo Kim,심정연,박문수 대한소아소화기영양학회 2012 Pediatric gastroenterology, hepatology & nutrition Vol.15 No.2
Toxic hepatitis is a rare but devastating disease in children. Herbs are widely used in oriental medicine to treat various symptoms in Korea, however, several herbs have been reported to induce liver injury. We report a case of toxic hepatitis induced by Hovenia dulcis in a 3-year-old boy. He complained of nausea, abdominal discomfort, and jaundice. The patient had consumed water boiled with hovenia dulcis for about 1 year prior to presentation. A diagnosis of toxic hepatitis was made based on his history, laboratory data, viral markers, ultrasonography, and biopsied liver tissue. We administered supportive management for acute fulminant hepatitis but his symptoms and liver function progressed. He was transferred to another hospital for further evaluation and consideration for liver transplantation. Because acute liver failure due to herbs or dietary supplement taken for a long time is often fetal, it is important to make early diagnosis and stop taking the drug as soon as drug induced liver injury is suspected.
Ryu, Nae-Hyung,Park, Kyung-Ran,Kim, Sung-Moo,Yun, Hyung-Mun,Nam, Dong-Woo,Lee, Seok-Geun,Jang, Hyeung-Jin,Ahn, Kyoo-Seok,Kim, Sung-Hoon,Shim, Bum-Sang,Choi, Seung-Hoon,Mosaddik, Ashik,Cho, So-Mi K.,Ah The Korean Society of Food Science and Nutrition 2012 Journal of medicinal food Vol.15 No.3
This study was carried out to evaluate the anticancer effect of guava leaf extracts and its fractions. The chemical compositions of the active extracts were also determined. In the present study, we set out to determine whether the anticancer effects of guava leaves are linked with their ability to suppress constitutive AKT/mammalian target of rapamycin (mTOR)/ribosomal p70 S6 kinase (S6K1) and mitogen-activated protein kinase (MAPK) activation pathways in human prostate cancer cells. We found that guava leaf hexane fraction (GHF) was the most potent inducer of cytotoxic and apoptotic effects in PC-3 cells. The molecular mechanism or mechanisms of GHF apoptotic potential were correlated with the suppression of AKT/mTOR/S6K1 and MAPK signaling pathways. This effect of GHF correlated with down-regulation of various proteins that mediate cell proliferation, cell survival, metastasis, and angiogenesis. Analysis of GHF by gas chromatography and gas chromatography-mass spectrometry tentatively identified 60 compounds, including <TEX>${\beta}$</TEX>-eudesmol (11.98%), <TEX>${\alpha}$</TEX>-copaene (7.97%), phytol (7.95%), <TEX>${\alpha}$</TEX>-patchoulene (3.76%), <TEX>${\beta}$</TEX>-caryophyllene oxide (CPO) (3.63%), caryophylla-3(15),7(14)-dien-6-ol (2.68%), (E)-methyl isoeugenol (1.90%), <TEX>${\alpha}$</TEX>-terpineol (1.76%), and octadecane (1.23%). Besides GHF, CPO, but not phytol, also inhibited the AKT/mTOR/S6K1 signaling pathway and induced apoptosis in prostate cancer cells. Overall, these findings suggest that guava leaves can interfere with multiple signaling cascades linked with tumorigenesis and provide a source of potential therapeutic compounds for both the prevention and treatment of cancer.
Ryu, Myong-Jin,Ryu, Dong-Ki,Chung, Sun-Ok,Hur, Yun-Kun,Hur, Seung-Oh,Hong, Soon-Jung,Sung, Je-Hoon,Kim, Hak-Hun Korean Society for Agricultural Machinery 2014 바이오시스템공학 Vol.39 No.1
Purpose: In protected crop production facilities such as greenhouse and plant factory, farmers should be present and/or visit frequently to the production site for maintaining optimum environmental conditions and better production, which is time and labor consuming. Monitoring of environmental condition is highly important for optimum control of the conditions, and the condition is not uniform within the facility. Objectives of the paper were to investigate spatial and vertical variability in ambient environmental variables and to provide useful information for sensing and control of the environments. Methods: Experiments were conducted in a strawberry-growing greenhouse (greenhouse 1) and a cherry tomato-growing greenhouse (greenhouse 2). Selected ambient environmental variables for experiment in greenhouse 1 were air temperature and humidity, and in greenhouse 2, they were air temperature, humidity, PPFD (Photosynthetic Photon Flux Density), and $CO_2$ concentration. Results: Considerable spatial, vertical, and temporal variability of the ambient environments were observed. In greenhouse 1, overall temperature increased from 12:00 to 14:00 and increased after that, while RH increased continuously during the experiments. Differences between the maximum and minimum temperature and RH values were greater when one of the side windows were open than those when both of the windows were closed. The location and height of the maximum and minimum measurements were also different. In greenhouse 2, differences between the maximum and minimum air temperatures at noon and sunset were greater when both windows were open. The maximum PPFD were observed at a 3-m height, close to the lighting source, and $CO_2$ concentration in the crop growing regions. Conclusions: In this study, spatial, vertical, and temporal variability of ambient crop growing conditions in greenhouses was evaluated. And also the variability was affected by operation conditions such as window opening and heating. Results of the study would provide information for optimum monitoring and control of ambient greenhouse environments.