Molecular Theory of Plastic Deformation (Ⅲ)$^*$

Kim, Jae-Hyun,Ree, Tai-Kyue,Kim, Chang-Hong Korean Chemical Society 1981 Bulletin of the Korean Chemical Society Vol.2 No.3

(1) The flow data of f (stress) and ${\dot{s}$ (strain rate) for Fe and Ti alloys were plotted in the form of f vs. -ln ${\dot{s}$ by using the literature values. (2) The plot showed two distinct patterns A and B; Pattern A is a straight line with a negative slope, and Pattern B is a curve of concave upward. (3) According to Kim and Ree's generalized theory of plastic deformation, pattern A & B belong to Case 1 and 2, respectively; in Case 1, only one kind of flow units acts in the deformation, and in Case 2, two kinds flow units act, and stress is expressed by $f={X_1f_1}+{X_2f_2}$where $f_1\;and\;f_2$ are the stresses acting on the flow units of kind 1 and 2, respectively, and $X_1,\;X_2$ are the fractions of the surface area occupied by the two kinds of flow units; $f_j=(1/{\alpha}_j) sinh^{-1}\;{\beta}_j{{\dot{s}}\;(j=1\;or\;2)$, where $1/{\alpha}_j\;and\;{\beta}_j$ are proportional to the shear modulus and relaxation time, respectively. (4) We found that grain-boundary flow units only act in the deformation of Fe and Ti alloys whereas dislocation flow units do not show any appreciable contribution. (5) The deformations of Fe and Ti alloys belong generally to pattern A (Case 1) and B (Case 2), respectively. (6) By applying the equations, f=$(1/{\alpha}_{g1}) sinh^-1({\beta}_{g1}{\dot{s}}$) and $f=(X_{g1}/{\alpha}_{g1})sinh^{-1}({\beta}_{g1}{\dot{s}})+ (X_{g2}/{\alpha}_{g2})\;shih^{-1}({\beta}_{g2}{\dot{s}})$ to the flow data of Fe and Ti alloys, the parametric values of $x_{gj}/{\alpha}_{gj}\;and\;{\beta}_{gs}(j=1\;or\;2)$ were determined, here the subscript g signifies a grain-boundary flow unit. (7) From the values of ($({\beta}_gj)^{-1}$) at different temperatures, the activation enthalpy ${\Delta}H_{gj}^{\neq}$ of deformation due to flow unit gj was determined, ($({\beta}_gj)^{-1}$) being proportional to .$k_{gj}$, the jumping frequency (the rate constant) of flow unit gj. The ${\Delta}H_{gj}\;^{\neq}$ agreed very well with ${\Delta}H_{gj}\;^{\neq}$ (self-diff) of the element j whose diffusion in the sample is a critical step for the deformation as proposed by Kim-Ree's theory (Refer to Tables 3 and 4). (8) The fact, ${\Delta}H_{gj}\;^{\neq}={\Delta}H_{j}\;^{\neq}$ (self-diff), justifies the Kim-Ree theory and their method for determining activation enthalpies for deformation. (9) A linear relation between ${\beta}^{-1}$ and carbon content [C] in hot-rolled steel was observed, i.e., In ${\beta}^{-1}$ = -50.2 [C] - 40.3. This equation explains very well the experimental facts observed with regard to the deformation of hot-rolled steel..

人 諸臟器 Alkaline Phosphatase Isoenzyme의 電氣泳動 및 定量

金在植,金京善,金重明,金榮泰,蔣卓仙,李鉉基 慶北大學校 醫科大學 1980 慶北醫大誌 Vol.21 No.2

著者들은 家兎와 人體로부터 採取한 血淸과 諸臟器組織을 使用하여 ALPI 電氣泳動像을 觀察하고 生化學的 定量法을 利用하여 ALP의 活性度를 測定試圖하였으며 臟器特異性 沮害因子에 對한 影響을 觀察하였다. 家兎 血淸 및 諸臟器組織 ALPI電氣泳動에서 血淸은 ±의 活性度를 가진 α2와 α2/β分劃을 나타내었으며 肝組纖은 血淸보다 빠른 移動度를 가진 ??의 α_1과 α_2分劃을 나타내었다. 그리고 肝, 骨, 腎 淋巴腺, 脾臟 및 腸組織에서는 顯著하게 높은 活性度를 나타내는 各各 서로 相異한 分劃을 볼 수 있었으며 人體諸 臟器와大體로 類似하였으나 家兎 血淸의 ALP는 사람에서 와는 다르게 肝組織의 分劃과 一致하지 않고 오히려 骨組織과 더 잘 一致되는 것 같았다. ALPI 活性度에 있어서 家兎의 諸臟器는 生化學的 定量法으로 腎 ALP의 活性度가 49.5B.L. units로 다른 臟器組織에 비하여 顯著하게 높았으며, 그 다음은 脾臟, 脊椎骨, 肝, 肺淋巴腺 및 脾 順으로 높은 活性度를 나타내었으며 人體에 있어서는 胎盤, 骨, 小賜, 脾臟, 肝 및 腎臟의 順으로 높았다. 臟器 特異性 沮害因子에 對한 影響에 있어서 胎盤分劃은 特有하게 耐熱性을 나타내었고 보다 urea低抗性이며 肝分劃은 neuraminidase에 對하여 移動度의 遲延을 招來하였다. The studies upon cellulose acetate microzone electrophoretic patterns, quantitative estimation and effects of organspecific inhibitor on ALP isoenzyme of rabbit and human sera and various organ tissues were performed. On electrophoretic pattern the tissue ALP from the liver bone kidney lymph node spleen and intestine showed the characteristic fraction of high activities. The electrophoretic mobility of rabbit serum ALP was not correspond to the liver ALP as observed in human serum and it appeared to be rather corresponded to the bone ALP, which seemed to be the origin of ALP in serum of rabbit. In the quantitative measurement of tissue ALP activity the kidney ALP showed the highest level and the activity of the skeletal muscle ALP was the lowest(1.5 B. L. units), while higher activities were observable in placenta, bone, intestine, spleen, liver and kidney in order. On the effect of organ specific physico chemical agents the placental ALPI was highly stable to the heat and relatively resistant to urea while other organ ALPI were on the contrary. The neuraminidase seemed to effect to the motility of liver fraction.

우관상동맥 개구부 완전 폐쇄가 동반된 대동맥 판상부 협착증 1례

임상현,김종진,김희열,진승원,전희경,노태호,채장성,김재형,홍순조,최규보,윤정섭,김치경 대한순환기학회 2000 Korean Circulation Journal Vol.30 No.4

웹 상에서 QoS 제공을 위한 Diff-HTTP

현은실,이윤정,김태윤 고려대학교 컴퓨터과학기술연구소 2001 JOURNAL OF COMPUTER SCIENCE & ENGINEERING TECHNOLO Vol.3 No.-

HTTP 프로토콜은 WWW에서 HTML(HyperText Markup Language)문서를 송수신하기 위해 사용하고 있는 애플리케이션 프로토콜로서 TCP를 수송 계층 프로토콜로 이용하여 이루어지는 애플리케이션 계층 프로토콜 가운데 하나이다. HTTP/1.0은 동일한 서버로부터 각각의 개체에 대하여 개별적인 TCP 연결을 생성하기 때문에 다중의 요구를 비효율적으로 처리한다. 이러한 문제를 해결하기 위한 방안으로 제안된 HTTP/1.1은 TCP 연결을 지속적인 연결(Persistent connection)이라는 개념을 도입하여 하나의 TCP 연결 상에서 다중의 요구(Request)를 처리하도록 하고 있다. 네트워크가 발전됨에 따라 사용자가 늘어나고 다양해지면서 서비스의 차별화 문제가 중요한 문제로 대두되었다. 본 논문에서 제시하는 Diff(Differentiated)-HTTP은 웹 서버에 서비스를 요청한 클라이언트들에게 차별화된 서비스를 제공하기 위해서 사용자를 두 등급, 기본 등급과 우선 순위를 고려한 상위 등급으로 구분한다. 각 등급은 제한 시간(Holding Time)으로 차별화 되고 상위 등급에 속한 클라이언트에게 제한된 시간을 증가 시켜 지연을 최소로 함으로써 고품질의 서비스를 제공하는 방안을 제시한다. The HyperText Transfer Protocol(HTTP), the Web's application-layer protocol, is at the heart of the Web. HTTP/1.0 establishes a new TCP connection for each HTTP request, resulting in many consecutive short-lived TCP connection. HTTP/1.1 standard reduces latencies and overhead from closing and re-establishing connections by supporting persistent connections as a default, which entourage multiple transfers of objects over one connection. HTTP/1.1, however, does not define explicitly connection-closing time but specifies a certain fixed holding time model. This paper proposes the mechanism of a Diff-HTTP((Differentiated-HTTP) supported by the server-side under HTTP/1.1. The current World-Wide Web services model treats all requests equivalently, while being processed by servers. Based on the policy, different levels of service are desirable. This paper presents, service-side, application-level mechanisms to provide each different level of web service with upper class and default class. Our experiments show that upper class latencies are reduced than default one.

자기공명영상을 이용한 만성 족관절통의 원인 분석

김현철,이경태,유재원,이상홍,선재명 조선대학교 부설 의학연구소 2000 The Medical Journal of Chosun University Vol.25 No.1

Purpose : Chronic ankle pain is one of the most popular problems with orthopedic clinicians, but it has complex etiologic factors in diagnosis. Recently, magnetic resornance imaging has used as common diagnostic modality in ligaments and tendon problems of ankle sprain. The purpose of this article is to determine the appearances and frequency of chronic ankle sprain by MRI, and to determine the value of MRI as a diagnostic tool. Materials and Methods : We have analysed MRI findings of 84 chronic sprained ankles over 6 months duration from September 1995 to January 1997. All cases had been past history of ankle injury. Among them, sports players ie, soccer, basket ball, competitive runner and ballet dancer are 51 cases( 60.7% ). Average age of patients is 27.06( 13 to 54 ) years old and sex ratio is 23:5. For the confirmative diagnosis, We adopted variable methods, ie, ultrasonogram, bone scan, CT scan, arthroscopic examination and surgical intervention. Results : The Etiologic factors of chronic ankle sprain by MRI includes 39 Lateral ankle instability due to Anterior Talofibular and Calcaneofibular ligamentous tear, 18 Peroneal tendon insufficiency ie, synovitis, longitudinal tear, subluxation and abnormal tendon insertion, 15 Osteochondral fracture of talus or tibia, 10 Anterior Impingement syndrome due to anterior bony spur, 9 Deltoid tear, 6 Os subfibulare, 4 Distal tibiofibular ligament abnormality, 3 Os subtibiale, 2 Ankle synovitis, 2 Intraarticular loose body. Conclusion : MRI study employed in hazy chronic ankle sprain is useful diagnostic modality. But, Diagnostic result using MRI was not correlated the clinical prognosis, and proper physical examination is important in the point of technical aspect to get the exact dissecting angle of MRI.

民法第二條二項의 解釋을 위한 姿料提供으로서의 몇가지

金顯泰 梨花女子大學校 法政大學 1964 法政學報 Vol.7 No.-

효소 및 추출을 이용한 전분이 함유된 고분자 필름의 생분해도 측정

김재현,박태현,한귀영 성균관대학교 생명과학자원연구소 1994 生命資源科學硏究 Vol.1 No.1

Various methods were proposed for the measurement of biodegradability of polymer materials by American Society for Testing and Materials(ASTM). In those methods, carbon dioxide evolution, oxygen consumption, and the weight loss of polymer are measured for the evaluation of biodegadability when microorganisms grow by using the polymer material as the only carbon source. Since a month or longer time is needed to measure the quantities, a rapid quantitative mathod is required to be developed. We used α-amylase for determining the biodegradability of starch-filled polyethylene film: however, the enzyme reaction was so slow. Further studies on the reaction conditions are necessary for the rapid completion of the reaction. Therefore, starch content in the film was measured for the evaluation of biodegradability on the assumption that starch is a perfect biodegradable material. NaOH solution was used for the extraction of starch from the film and the weight loss of the film was measured.

2000학년도 입학관련 정책연구

김선형,남상인,엄태준,제갈욱,신현철,권준택 순천향대학교 부설 산업기술연구소 1999 순천향 산업기술연구소논문집 Vol.5 No.1

This paper presents an improved admission policy of 2000 academical year so that more promising students apply for the University. By analyzing the past admission data and the questioned report, a unique admission policy has been suggested as the University feature reflected. One of the major differences compared from the admission policy of the last year is that the entry number limit for the special admission is in creased or newly established such as the entry allocated for recommended students, perfectly attending students, and regionally apportioned students. Also established is the special admission for those licensed students and late educated students.

“Le Pe`re Goriot”의 희극성에 관하여

金炫邰 단국대학교 1984 論文集 Vol.18 No.-

茵蔯蒿가 흰쥐 肝조직내 Na^+·K^+ -ATPase 活性에 미치는 영향

金柱賢,申國鉉,趙台淳 成均館大學校 科學技術硏究所 1987 論文集 Vol.38 No.2

In order to investigate the effects of Artemisia on bile flow, the bile volume and the activities of Na^+·K^+-ATPase in liver plasma membrane and liver homogenate were examined in rats orally administered methanol extract of Artemisiae messer-schmidtiana Besser var. viridis Besser for 3 days. In the case of bile juice, the flow rate was increased 30∼70%. The activities of Na^+·K^+-ATPase was increased to 2.5 fold in liver homogenate and 2.1 fold in liver plasma membrane. On the other hand activities of Mg^++-ATPase was slightly increased in both liver homogenate and liver plasma membrane.