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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.
서가대에 揭示된 小字報를 통해 본 科學英才들의 心理 硏究
陸根鐵,金俊泰 공주대학교 사범대학 과학교육연구소 1997 과학교육연구 Vol.28 No.1
과학영재들이 도서실 서가대에 적어논 소자보를 수집 분석하여 그들이 어떤 문제에 관심을 가지고 있으며, 자신의 목표를 달성하기 위해서 자기 자신을 어떻게 통제하고 길들이고 있는가를 알아보았다. 그 결과 과학영재들은 학교공부 및 진학에 가장 큰 관심을 갖고있으며 자기자신의 자아실현을 위해서 끊임없이 담금질을 하는 목표지향적 특성을 가지고 있었다. 특히 교사와의 인간관계에 있어서 매우 힘들어하는 경향이 나타났다. We investigated the scientifically gifted students' major interests and the discipline for the perfection of themselves through the Sojabo post noted on their bookshelves. As a result, We recognized that they have goal-oriented characteristics and being stressed under competition among friends. Espacially, We discovered that the human relationship with their teachers have a tendency to getting difficult.
이준철 부천대학 1995 論文集 Vol.16 No.-
I am concerned with the triangulation of the points in the plane : Given n points in the plane, join them by nonintersecting straight line segments so that every region internal to the convex hull is a triangle. So far I have met many kinds of triangulation algorithms in serial. But I am trying to speed up these algorithms at any way. Hence I used parallel computing model for this purpose. I presented optimal parallel algorithm for triangulation of the points. These algorithm run in O(log n) time with O(n) processors on the CREW PRAM model.
육근철,김용복,이희복,정기주,김준태 공주대학교 과학교육연구소 2003 과학교육연구 Vol.34 No.-
제1회 한국물리탐구토론대회에는 10개의 문제가 출제되었는데 본 연구에서는 이들 10개의 문제 중 『접착테이프(Adhesive tape)』 문제를 해결한 5개 팀의 보고서와 『Fractal Diffraction』 문제들 해결한 고등학생부 3개 팀과 중학생부 1개 팀의 보고서를 비교 분석하였다. 그 결과 학생들은 접착테이프를 갑자기 뗄 때 빛이 발생하는 원인을 정전기 발생, 전자의 이동, 에너지의 변환 등으로 해석하였다. 그리고 Fractal 문제의 경우 학생들은 Fractal 이라는 개념을 제대로 이해하지 못하여 잘못된 방향으로 문제를 해결한 팀이 많았다. 특히 『Fractal Diffraction』문제는 출제된 10문제 중 가장 까다로운 문제로 학생들이 생각하고 있는 것으로 조사되었다. 본 대회는 탐구 토론대회이므로 탐구의 과정별로 새로운 아이디어를 제안하여 결론에 이르는 창의적 탐구 과정이 제안되어야 한다. We have analyzed students' reports on two problems such as "adhesive tape" and "fractal diffraction" among ten assigned-problems in the first Korean youth physics tournament. (KYPT). There were five team's reports on "adhesive tape" and four team's reports on "fractal diffraction". Students analyzed that the reason for lightening coming out from the stripping down adhesive tape ma be caused by electrostatic friction, electron transfer, energy transformation, etc. However, many students failed to solve the "fractal diffraction" problem correctly. This pro blem is found to be most difficult one among ten problems in the first KYPT for the reports should include the creative investigations by their own ideas in every steps of inquiries.
李俊榕,吳圭哲,金珍 弘益大學校 科學技術硏究所 2000 科學技術硏究論文集 Vol.11 No.-
Nowadays, there are large scale of creations, distributions and transformations of informations. Wide sharing and urgent changing of information is a primary characteristics of recent period. By the way, some kind of informations must be treated in different way. For example, geographic information for military operations must be distributed in great care with strict security and maybe few change will occur on such information. In this paper, we have studied and implemented new retrieval system that are especially appropriate when informations have following characteristics. 1. when consistency of information is important 2. when distribution of information must be done collectively 3. when change of information is not severe