무선 ATM망에서의 트래픽 스케줄링의 페트리 넷 모델링

장경수 경인여자대학 2002 경인논집 Vol.- No.9

The demand of users for the multimedia traffic is increasing in the wired and wireless networks. In this paper, we present petri nets model of scheduling algorithm which is guaranteeing the Quality of Service for each kind of traffic class in the wireless ATM network. The petri nets model need not consider either large state space dimension nor complex computation. Petri nets model is graphical and mathematical model. Presenting the petri net model of scheduling algorithm for wireless ATM is easily extendable and provides an approximate analysis method.

항진균물질을 생산하는 Streptomyces fimbriatus AF21-3의 분리 및 동정

장주현,김정완,이우윤,윤영준,이경림,김승곤,이태수 인천대학교 2000 基礎科學論文集 Vol.11 No.1

Actinomycetes were isolated from soil to find new antibiotics. An active antimicrobial compound was isolated from the culture filtrate of Actinomycetes AF 21-3. The Actinomycetes strain which showed strong antifungal activity against Candida tropicalis and Microsporum gypseum was identified as Streptomyces fimbriatus and named as Streptomyces fimbriatus AF 21-3.

레이저에 의한 유리내부의 첨가이온의 전하상태 변화

임기수, 장경식, 신종호, 이수천 忠北大學校部設基礎科學硏究所 2006 自然科學硏究 Vol.20 No.-

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純 Ti 金屬의 高溫酸化擧動

張重浩,蔡京洙,李大喆 全北大學校 1994 論文集 Vol.38 No.-

The oxidation behavior and mechanism of pure Ti has been investigated in air over the temperature range from 973K to 1273K. The phases of oxidation products and matrix have been examined by scanning electron microscopy, x-ray diffractometer and optical microscopy. The rate of oxidation of pure Ti follows a parabolic rate law in an initial stage of oxidation process but a linear rate law in the later stage. The transition from the parabolic to linear rate law take places when the thickness of oxide layer reaches a certain value, and the oxide layer formed thereafter contains a lot of defects which have been considered to form due to the stresses present at the matrix-oxide interface. The rate determining process in the overall oxidation of pure Ti is observed to be the inward diffusion of oxygen through the oxide layer.

SAN을 이용한 큐잉모델 해결방법

장경수,신호진,이상호,김병기,신동렬 成均館大學校 科學技術硏究所 2000 論文集 Vol.51 No.2

Queueing analysis, in general., has the intrinsic problem of large state space dimension and complex computation. In fact, the petri net is a graphical and mathematical model. It has been used for the modeling of various applications, in particular, manufacturing systems. It can deal with parallelism, concurrence, deadlock avoidance, and asynchronism. Currently it has been applied to the performance of computer networks and protocol verifications. This paper presents a technique for modeling and analyzing queueing model using stochastic activity networks (SANs). And then some examples are showed for the verification of the technique presented in this paper.

『素問·疾態論』에 대한 硏究

장종렬,김명수,서대선,김종호,천상묵,금경수 한국전통의학연구소 2002 한국전통의학지 Vol.12 No.1

A study on the Byungtae Ron(病能論) of the So Moon(素問), one of the classic book of oriental medicine, was carried out analytically for the right comments. The principal ideas obtained summarized as follows; Neng(能) is similar to tae(熊) in the pronunciation and the meaning of a chinese character. Byungtae(病能) means the state of the symptoms and the pulse condition of the diseases, etc. It deals with ethological factor, mechanism of disease, the condition of an illness, method of diagnosis, rule of treatment, technique of treatment of seven diseases and taking this seven diseases as a example, mainly discuss the technique and significance of clinical observation and the pathogenesis and condition of an illness, so It named 「Byungtaeron(病能論)」 In this chapter it shows we can grasp condition of illness well only if we classify the pathogenesis and condition of an illness in details. this viewpoint provides the foundation of development in oriental diagnostics. It places emphasis on pulse feeling in this chapter, so it describes pulse condition of various kinds of diseases in details. It also presents how to compare pulse feeling like comparison between Inyoungmaek(人迎脈, arterial carotid communes, the pulsation of which is easily felt beside Adam's apple) and Ch'onkumaek(寸口脈, the radial artery on the wrist where the pulse is routinely taken for diagnosis), between right and left Ch'onkumaek(寸口脈), between Yangmyungsangdong (陽明常動) and Taeyangbudong(太陽不動), Soyangbudong(少陽不動), etc. In this chapter it explains pulse feeling occupies a high position in the diagnosis of diseases in 『Huangdi's internal Classic(黃帝內經)』 period and the technique of pulse feeling is already plentiful and minute. In this chapter it presents 「Tongbyungyich(同病異治, to apply different methods of treatment to the same kind of disease)」 theory, taking tangible syndromes as examples. this is prominent viewpoint of determination of treatment based on the differentiation of symptoms and signs and much influence development of later ages' medicine. On the ground of oriental medical theory, it may bring about different symptoms in the same disease according to stage of disease, the seasons, the regions, the constitution of patient, therefore surely adopt different technique of treatment, this differentiation of symptoms and signs is an important character in oriental medicine.

TiNi 金屬間化合物의 高溫酸化擧動에 관한 硏究

張重浩,蔡京洙,李大喆 全北大學校 1995 論文集 Vol.40 No.-

The oxidation behavior and mechanism of intermetallic compounds TiNi has been investigated in air over the temperature range from 923K to 1073K. The phases of oxidation products and matrix have been examined by scanning electron microscopy, x-ray diffractometer and optical microscopy. The rate of oxidation in intermetallic compound TiNi follows the parabolic rate law in an initial stage of the oxidation process but it does not follow the parabolic rate law in the later stage. Oxidation products formed on the matrix consist of a layer structure of TiO_2(rutile), TiO_2 phase containing TiNiO_3 particles, TiO_2, Ni phase containing Ti, TiN_i3 phase and TiNi matrix in sequence from the outer side. The rate determining process in the overall oxidation of TiNi is the inward diffusion of oxygen through the oxide layer and the outward diffusion of Ti through the Ni phase.

소각재 용융슬래그를 이용한 제올라이트 Na-A의 합성

장영남,채수천,배인국,류경원 한국광물학회 2005 광물과 암석 (J.Miner.Soc.Korea) Vol.18 No.1

소각재 용융슬래그를 출발물질로 하여 알카리 조건하에서 활성화시킴으로써 Na-A형 제올라이트를 합성하였다. 합성실험은 스텐레스 철재로 제작된 반응용기를 사용하였다. 출발물질은 슬래그 외에 수정인공합성 공장에서 배출되는 '규산질 수용액'과 NaA1O₂수용액을 사용하였는데, 전자의 화학조성은 SiO₂5.7 wt% Na₂O 3.2 wt%이고, 후자는 몰비가 Na₂O/A1₂O₃= 1.2와 H₂O/Na₂O=9의 조건으로 알루미늄 드로스와 NaOH 수용액을 반응시켜 제조하였다. 위에서 언급된 슬래그, '규산질 수용액' 그리고 NaAlO₂ 수용액을 혼합시킨 혼성물을 약 80℃에서 7~8시간 반응시키면 Na-A형 제올라이트가 단일상으로 합성되었다. 출발물질의 이상적인 혼합비율은 Na₂O : Al₂O₃: SiO₂의 물비가 1.3~l.4 : 0.8~0.9 : 2이었으며 반응용액과 슬래그의 비율은 1 : 7~10 (g/㏄)이었다. 합성된 제올라이트의 형태는 균일한 입방형이었으며 입도는 약 1 ㎛이었다. 한편, Ca^(²+)이온에 대한 이온교환 용량(CEC)은 180~210 meq/100 g이었으므로 통용되는 세제용 제올라이트와 비교하면 약 80% 수준이었으므로 폐수처리나 오염된 중금속처리와 같은 환경처리용으로 사용될 수 있을 것이다. Na-A zeolite were synthesized from melting slag of the incinerated ash by the alkaline activation processes. The experiments were performed in stainless steel vessels, with continuous stirring during the reaction periods. The silica-rich solution, a starting material, which was the waste of crystal growth factory, contains 5.7 wt% SiO₂ and 3.2 wt% Na₂O And NaAlO₂was made by the reaction of aluminium dross and NaOH solution and its molar ratios were Na₂O/ Al₂O₃ = 1.2 and H₂O/Na₂O=9. During the residence time of 7~ 8 h at 80℃, the mixing of the silica-rich solution, NaAlO₂and melting slag yields the production of homogeneous Na-A zeolite. The optimal reactant composition in molar ratio of Na_₂O : Al₂O₃: SiO₂was 1.3~l.4 : 0.8~0.9 : 2 and mixing ratio of solution and slag was 1/7~10 (g/㏄). Synthesized Na-A zeolite has cubic form uniformly and its size ranges about 1㎛. Ca^(²+) ion exchange capacity of the Na-A was about 180~210 meq/100 g, corresponding approximately 80% to the commercial detergent builder.

중탄산나트륨(NaHCO₃)투여가 1000m 카누경기력, 혈액 pH, 그리고 혈중 젖산농도에 미치는 영향

장경태,이정수,배희정 韓國體育大學校附屬 體育科學硏究所 1993 韓國體育大學校附屬 體育科學硏究所論文集 Vol.12 No.1

The following experiment was conducted to examine the effects of NaHCO₃ ingestion on performance and selected blood parameters in 1000m canoe exercise. Six high school male kayakers participated in this study. Three time trials were conducted on three seperate occasions(control, placebo, NaHCO₃) at the Misari Olympic Rowing and Canoe facility. The dose of NaHCO₃ was 300mg per kg body weight and given to the subjects 90 min before the start of exercise. Time ives measured at 1000rn and at each four 250m. Blood samples were collected at rest, before exercise, and three minutes after the termination of exercise. The results are as follows : 1. Although ingestion of NaHCO₃ tend to decrease the 1000m canoe trial time, there was no significant difference between trials. 2. Blood pH was significantly increased 90 min after NaHCO₃ ingestion. 3. Although blood lactate concentration after exercise was higher in the NaHCO₃ trial, there divas no significant difference between each trials.

素問·痺論에 대한 硏究

張斗浩,張鍾烈,琴坰樹,朴炅 圓光大學校 韓醫學硏究所 1996 원광한의학 Vol.6 No.1