• Journal of IKEEE
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• v.19 no.4
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• pp.520-525
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• 2015

This paper investigates the consensus problem for high-order integrators with an arbitrary large communication delay. In order to solve this problem, new consensus controller with an additional design parameter that can eliminate the effect of a communication delay on the consensus problem is proposed. Also, it is proved that the proposed consensus controller can always solve the consensus problem of high-order integrators even in the presence of an arbitrarily large communication delay. Finally, an illustrative example is given in order to show the effectiveness of our design method.

• Journal of the Korean Society of Food Science and Nutrition
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• v.33 no.2
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• pp.420-426
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• 2004

In this study, among 10 medicinal plants extracted with 50%-ethanol, antimicrobial activities measured by paper disc method were showed in Scutellaria baicalensis (Sb) on Leu mesenteroides and in Phellodendron amurene (Pa) on Lac. plantarum and Leu. mesenteroides. While 0.05∼0.2% of Pa extracts showed also relatively strong growth inhibition of both strains of lactic acid bacteria cultured in MRS broth for 24 hours at 3$0^{\circ}C$, Sb extract at concentration of 0.1% showed similar inhibitory effect on Leu mesenteroides to that of 0.05% of Pa extract. Addition of 0.02∼0.04% of Pa extracts to kimchi lowered effectively extents of pH decrease and acidity increase, and numbers of lactic acid bacteria and total bacteria compared to those of control during fermentation at 4$^{\circ}C$. This extending effect on fermentation period was obtained by adding 0.04% in case of Sb. Mixed extracts of Pa and Sb (Pa-Sb) by ratio 1 : 1 delayed also fermentation of kimchi at 0.03∼0.04%. In sensory evaluation kimchi containing 0.04% of Pa extract were less sour than kimchi containing 0.02% of Sb extract and/or control at late stage of fermentation.

• Fire Science and Engineering
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• v.24 no.3
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• pp.52-57
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• 2010

Fire protection countermeasure were considered on the straw thatched roof and wooden structure. For the fire resistant treatment, rice straw was soaked in the fire resistant liquid with different soaking time. After treatment, some rice straw sample was washed with water then the rice straws were tested to check the fire resistance performance. And the wood was soaked in the fire resistant liquid at an atmospheric pressure, vacuum-pressure condition and painted with brush on the surface. To analyse the fire resistant performance of rice straw, ignition delay time was measured under the radiant heat flux of cone heater. And the fire resistant performance of wood samples were tested with 45 degree fire resistant test apparatus and cone heater. Based on the cone heater test, the rice straw which most easily ignitable material shows the longer ignition delay time than not treated ones and even in the water washed straw show a longer ignition delay time than not treated ones. And fire resistant treated woods of vacuum-pressure treated sample showed the most excellent performance on fire resistance. And the fire resistant treated by brush and soaking showed a longer ignition delay time than not treated ones. From this experiment, it was found that a fire resistant treatment of rice straw and wood of the house can be protected from the fire spread.

• Journal of Life Science
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• v.21 no.10
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• pp.1422-1427
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• 2011

This study was performed to develop effective antithrombotic agents from traditional herb extracts. Prunella vulgaris L. has been used traditionally as a medical resource in cancer therapy, as well as treatment of hypertension and inflammation, and as a diuretic. However, the effects of Prunella vulgaris on thrombosis and platelet activation have not been clearly understood. Antithrombotic and antiplatelet activities of oriental medicinal herbs were investigated by evaluating the effect of the aqueous extract from Prunella vulgaris on the blood coagulation, platelet aggregation and fibrinolysis. Prunella vulgaris extracts showed effective anticoagulant activity in coagulation times such as activated partial thromboplastin time (APTT) and prothrombin time (PT). Prunella vulgaris also inhibited adenosine diphosphate (ADP)- and collagen-induced platelet aggregation. In addition, evaluation of fibrinolytic activity showed that the Prunella vulgaris extracts have high solubility. From these results, it is suggested that Prunella vulgaris can be a potential candidate for anticoagulants and antiplatelets, as well as fibrinolytic agents.

• Proceedings of the Korean Information Science Society Conference
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• 2004.04a
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• pp.862-864
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• 2004

다수 사용자용 인터넷 게임은 그 특성상 게임 클라이언트간 또는 게임 클라이언트와 게임 서버간에 네트워크 지연은 피할 수 없고 이로 인해서 사용자가 느끼는 실감은 상당히 줄어 든다. 본 논문에서는 클라이언트-서버형태의 게임구조 하에서 이런 네트워크 지연에 따른 문제점을 해결하는 사용자들간의 상태 동기화 방법을 제안한다. 이 방법은 게임상 가상공간을 여러 영역으로 나눈 후, 각 클라이언트에 도착하는 메시지들의 발생 영역에 따라서 배치처리 시간간격 (time interval)을 달리하는 동기화 방법이다. 이 동기화 방법은 기존 방법에 비해서 롤백 (roll back) 수의 큰 증가 없이 사용자 반응시간을 현저히 줄이는 효과를 보인다.

• The Korean Journal of Zoology
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• v.30 no.2
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• pp.177-192
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• 1987

온열처리가 근세포의 분화에 어떤 영향을 미치는 지를 알아보기 위하여 배양한 근세포에 여러가지 온열처리를 한 다음, 단백질 합성, 세포증식, 융합지수, creatine kinase(CK)의 활성 및 cholesterol 함량의 변화를 조사하였다. 배양한지 24시간지나 45$^{\circ}C$에서 1 hr의 온열처리를 하면 근세포의 융합과 CK 활성이 지연되었으며, 55시간지나 같은 온열처리를 하면 세포막내(세포내 양의 95% 이상)의 chloesterol 양이 일시적으로 증가함과 아울러 세포융합이 지연되었다. 그러나 세포증식은 대조군과 뚜렷한 차이가 없었다. 이상과 같은 실험 결과로부터 온열처리가 분화에 미치는 영향은 온열처리를 받게되는 근원세포의 분화정도에 따라 차이가 있으며 온열처리에 따른 chloesterol 양의 일시적인 증가가 근세포 융합에 영향을 미칠 수 있다는 가능성이 제시되었다. 한편, 근세포는 온열처리를 받으면 평소의 단백질 합성 수준이 떨어짐과 더불어 heat shock protein(HSP)합성이 증대 내지는 유도 되었으며 HSP 합성의 유도는 actinomycin D의 처리로 억제되었다. 또한 온열처리로 근세포는 열내성을 얻어 세포융하과 CK 활성은 동일한 온열처리를 4시간 간격으로 두번 주어도 한번 주었을 경우와 차이가 없었으며 두번째 온열처리에 의해서는 새로운 HSP 합성이 유도되지도 않았다.

• KIPS Transactions on Computer and Communication Systems
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• v.12 no.2
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• pp.47-52
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• 2023

Mobile Edge Computing(MEC) is considered as a promising technology to effectively support the explosively increasing traffic demands. It can provide low-latency services and reduce network traffic by caching contents at the edge of networks such as Base Station(BS). Although users may associate with the nearest BSs, it is more beneficial to associate users to the BS where the requested content is cached to reduce content download latency. Therefore, in this paper, we propose a mobility-aware joint caching and user association algorithm to imporve the cache hit ratio. In particular, the proposed algorithm performs caching and user association based on sojourn time and content preferences. Simulation results show that the proposed scheme improves the performance in terms of cache hit ratio and latency as compared with existing schemes.

• Applied Biological Chemistry
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• v.44 no.3
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• pp.137-142
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• 2001

In order to prove physiological function of biopolymer from Bacillus coagulans CE-74, in vitro experiments simulating the passive membrane transport of gastrointestinal tract were carried out using dialysis membrane. And inhibition effect of isolated biopolymer on tyrosinase and angiotensin converting enzyme (ACE) were observed. The glucose retardation index after 30 min dialysis was 43.5% in the presence of 2% biopolymer. As the dialysis period became longer, the retarding effect toward glucose absorption decreased and the effect was close to zero after 5 hr dialysis. The bile acid retardation index after 30 min dialysis was 34% and 44.2% in the presence of 1% and 2% biopolymer, respectively. The effect decreased as the dialysis time elapsed. It was measured by arosinase inhibition activity of biopolymer that inhibition effect was 48.5% in $20\;{\mu}g/{\mu}l$. In a ACE inhibition activity, biopolymer showed inhibition activity as 97% in $10\;{\mu}g/{\mu}l$.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.8
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• pp.325-333
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• 2020

This study compares the rapidity and subjective convenience of T-AED and SC-AED for health care providers and the general public. Subjects were randomly allocated to T-AED (n=77) and SC-AED (n=79) groups. Each group conducted defibrillation, with subsequent measurement of the rapidity of defibrillation in peri-shock pause, pre-shock pause, hesitation pause, and post-shock pause. Defibrillation and chest compression delay times for both equipment were analyzed by t-test. On conclusion of the experiment, subjects answered a questionnaire on the subjective convenience of defibrillation, as measured for confidence, convenience, and clear decision. Comparisons of subjective convenience analyzed by t-test revealed significantly shortened peri-shock pause (11.22s), pre-shock pause (11.04s), and hesitation pause (2.15s) in the SC-AED group, as compared to the T-AED group (p<0.001). However, no significant differences were observed for post-shock pause values. Comparing subjective convenience, confidence (T-AED: 7.62±1.25VAS vs. SC-AED: 7.80±0.98VAS, p=0.358) was not significant, whereas convenience (T-AED: 7.05±1.36VAS vs. SC-AED: 8.95±0.89VAS, p<0.001) and clear decision (T-AED: 6.58±1.73VAS vs. SC-AED: 9.08±0.98VAS, p=0.001) showed statistically significant differences. Our results indicate that compared to T-AED, SC-AED has significantly shortened pauses. Moreover, it is more convenient for the user, and significantly aids in clear decisions.

• The Journal of Natural Sciences
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• v.1
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• pp.1-6
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• 1987

Pulse delays among operating lines are observed in a multiline operation transversely excited atmospheric pressure $CO_2$ laser which has an intracavity germanium etalon. To show the delay effect more precisely, we have replaced the etalon with a 40%/antireflecting coated ZnSe half mirror obtained two laser lines in which the delay can be controlled by a slight tilting of the output coupler, The results show that the individual rotational vibrational transition lines must have almost equal intensities in multiline oscillation in order to obtain high peak power and short pulses.