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Active Audit and Topology Adaptation in Unstructured P2P Overlay Networks
Park, Jun-Cheol Research Institute of Science and Technology HONGI 2005 Hongik Journal of Science and Technology Vol.9 No.-
To make a peer-to-peer(P2P) network free from selfish or malicious peers is a challenging task because of the flat, fully distributed, autonomous, and anonymous nature of such networks. In this paper, we focus on a peer's intentional act of dropping a relaying message, which is hard to be traced to its doer. We propose an audit and topology adaptation scheme to confine and weaken the ill effect from peers dropping messages on other peers in an unstructured P2P network. Using active network technologies, the scheme makes some routers with augmented capability assist the peers in adjusting their overlay connections. It uses a small set of basic primitives only and thus applies to all kinds of unstructured P2P networks. In fact, any legacy peer can execute the algorithm used in the scheme for its own gain by issuing a single query as if it were searching for a file. The scheme encourages the peers to comply with the protocol of the network, which leads to the improvement of service quality and peer satisfaction level. As preliminary results, a restricted usage pattern of the scheme is experimented using various metrics, which demonstrates the practicality of the approach.
다발성 대장암 간전이 환자의 간절제를 위한 새로운 시도
주종우,김형철,임철완,신응진,조규석,유기원,송옥평,홍대식,박성진,조준희,이혜경,김희경,권계원,고은석 순천향의학연구소;Soonchunhyang Medical Research Institute 2004 Journal of Soonchunhyang Medical Science Vol.10 No.2
Multiple bilobar liver matastases (MBLM) are the main cause of low resectability in the colon cancer liver metastases. The authors experienced one case of initially non-resectable colon cancer liver metastases. He was curatively and safely treated with a two-stage hepatectomy using the new method of future remnant liver volume growing. A 54-year-old man was referred to our department with the sigmoid colon cancer combined with MBLM, which were checked in two small metastatic lesions in the left lobe and five large sized lesions in the right lobe in the computed tomogram (CT). A laparoscopic assisted anterior resection was primarily performed. We performed the 1^(st) stage hepatectomy 3 weeks after the colon resection. Intra-operative Ultrasonogram (US) found 9 small superficial metastatic lesions in the left lobe. All that lesions were completely removed by non-anatomical wedge resection. An occlusion ballon catheter was placed in the right portal vein through a small branch of the inferior mesenteric vein at that time. The future remnant liver volume was sufficiently increased 3 weeks after the 1^(st) hepatectomy. A right hepatectomy was safely performed 22 days after the 1^(st) hepatectomy. The patient received a regional chemotherapy (interleukin2 based immuno-chemotherapy through hepatic artery) for 4 months, then received 9 cycles of systemic chemotherapy (biweekly Oxaliplation, leucovorin, plus 5-fluorouracil) without any recurrence evidence.
제 3 대구치 발치시 환자의 호흡 패턴이 스트레스 변화 양상에 미치는 영향
이상명,김형욱,박양호,김진철,박준우,이성준,안재목,Rhee, Sang-Myung,Kim, Hyung-Wook,Park, Yang-Ho,Kim, Jin-Cheol,Park, Jun-Woo,Rhee, Sung-Jun,Nyamdorj, Selenge,Ahn, Jae-Mok 대한구강악안면외과학회 2007 대한구강악안면외과학회지 Vol.33 No.5
Purpose: Heart rate variability(HRV) is the clinical consequence of various influences of the autonomic nervous system(ANS) on heart beat. HRV can estimate the potential physiologic rhythm from the interval between consecutive beats(RR interval or HRV data). It is known as RSA which represents respiration-related HR rhythmic oscillation. Previous studies demonstrated a specific breathing pattern(0.1Hz, 6breaths/min) to improve a physiological body condition related to the stress. In this paper, the level of stress would be evaluated in terms of three phases of the dental treatment, combined with 6breaths/min. Methods: These phases include before, during and after tooth extraction or anesthesia or something.36 patients' stresses were assessed using HRV stress analyzer in each phase in Kangdong Sacred Heart Hospital, and Chuncheon Sacred Heart Hospital, Hallym University Medical Center from Jun. to Sept. of 2007. HRV 5-min data collected were analyzed in time-domain and frequency-domain to evaluate the activity of autonomic nervous system(ANS) which represents the level of stress. Results: All HRV parameters including HF(high frequency), LF(low frequency) and LF/HF ratio showned a significant change affecting the ANS balance. There was a 6.4% difference between R(LF/HF)s on general breathing pattern for balance of Autonomic nervous system, but on controlled breathing pattern, 0.1Hz, was made narrow till 1.4%. The activity of ANS has increased by 1.4% on general breathing pattern, and by 2.9% on controlled breathing pattern, 0.1Hz. Conclusion: After analysis of preoperative stress changes and effect of breathing pattern of 0.1 Hz on the stress in 36 patients who have undergone third molar extraction, following was concluded. In the preoperative stage, the sympathetic change was the greatest?after the?anesthetic injection, and stress was relieved by controlling the breathing pattern to a frequency of 0.1Hz.
치과용 앨지네이트의 국산화를 위한 규격 및 안전성에 관한 연구
김철위,허준호 大韓齒科器材學會 1990 대한치과재료학회지 Vol.17 No.1
The purpose of this study was to investigate the setting time, viscosity, surface detail reproduction, working time, permanent deformation, strain in compression, compressive strength, temperature rise during gelation, differential thermal analysis, acidity and toxicological properties of representative fourteen commercially available dental alginate impression materials (AG, AP, AR, CC, ID-Ⅰ, ID-Ⅱ, JT, KG, PG, PC-I, PC-Ⅱ, SM-I, SM-Ⅱ and ZG) and three experimental dental alginate impression materials(Exp A, Exp B and Exp C). These tests were performed by the methods of KDA specification No. 8, ISO specification No. 1563 and ANSI/ADA specification No. 18. Form the experiments, the following results can be drawn: 1. The setting time of the fast setting types showed considerable differences according to the products, but there was no significant difference in setting time of the normal setting types. The significantly difference of viscosity values for the normal setting types was observed with various commercial products, but there was no significant difference for the fast setting types. 2. The reproduction of surface detail of the normal setting types was higher than that of the fast setting types, and the working time of the alginate impression materials showed considerable difference according to the products. 3. The permanent deformation of the fast setting types was lower than that of the normal setting types, and the strain in compression, the compressive strength, and the temperature rise during gelation of alginate impression materials showed considerable differences according to the products. 4. The rapid endothermic temperature curves of the alginate impression materials proceed at 127.0℃∼134.7℃, and the exothermic temperature curves showed at 327.7℃∼367.0℃ 5. The acidity of the alginate impression materials showed considerable differences according to the products, and the fast setting types was lower than that of the normal setting types. 6. The results indicated that the dental alginate ingredients did not increased the frequencies of micronucleated polychromatic erythrocytes when compared with negative controls.
유도형 변위 센서의 전기 노이즈 분석과 센서 성능에 미치는 영향 고찰
신우철,홍준희,이동주 한국공작기계학회 2003 한국공작기계학회 추계학술대회논문집 Vol.2003 No.-
Noise is a problem in many electronic circuits and active control system. Arising from spuriously coupled noise from other circuits, it corrupts the signal of interest and introduces an uncertainty into information it contains. In this paper, we have researched noise characteristics of the inductive displacement sensor which has been designed. we first present basic concept and characteristics of magnetic field-coupled noise in the sensor output signal. Then, we are present relation noise and sensor performances. Finally, we concentrate low noise design of a sensor driver and a signal detection circuit.
MK2 로봇에 대한 가변구조 위치제어와 MSDS 분석에 관한 연구
함철주,조준익 群山大學校 情報通信技術硏究所 1998 情報通信技術硏究論文集 Vol.2 No.-
Analyzing the kinematic or dynamic equations of motion for coordination and control of a robotic system, we adopt a graphical simulation to animate the motion results. A new control algorithm is developed for manipulators using the theory of variable structure systems. To illustrate the design procedures, a two-joint manipulator is considered. The hybrid simulation method has demonstrated that the variable structure approach is applicable to manipulator controller design.
이준철,류상률,김승호 경북대학교 산업기술연구소 1992 産業技術硏究誌 Vol.20 No.-
This paper proposes the process of the implementation of the integrated medical information system. We also discuss the object, effect and practice of implementation.
임영준,이용근,임범순,김철위 大韓齒科器材學會 2004 대한치과재료학회지 Vol.31 No.1
It is well known that surface modification of titanium for implant has been shown to improve the adhesion, migration and differentiation of adjacent cells and tissues. This study presented the results of an experimental study on the interaction between MC3T3-E1 (mouse calvarian osteoblast cell line) cells and cp-titanium treated by thermal oxidation at four different temperatures after TiO2 blasting and NaOH treatment, which could provide the benefits of surface roughening and favorable oxide layer formation. No heat treatment group was used as a control. Cell interactions were studied using the combination of phase contrast microscope and scanning electron microscope. Potential cytotoxicity was tested by MTT assay. The response of osteoblast cells was different according to the condition of surface modifications. Thermal oxidation at 600℃ showed the best early cell attachment and calcium nodule formation compared to other groups. Thermal oxidation at 800℃ showed the worst cell attachment and proliferation. In general, osteoblast cells were attached to accompanying the formation of cellular process, spreaded and differentiated on the specimen surfaces. Calcium nodules were formed on the surface after these cells were developed multiple cell layers. These early osetoblast/titanium interactions might play a critical role in the osteoinduction stage of osseointegration. There was no statistically significant difference in cytotoxicity among the heat treated surfaces from the MTT assay(p>0.05). The results of microstructure analysis of the characterized cp-titanium surface of this study will be published separately.