개선된 다출력 동적 CMOS 설계 방식을 이용한 고성능 32 비트 CLA가산기 설계 및 구현

송근호,방만식,서정훈,한석붕,이효상,김강철 慶尙大學校生産技術硏究所 1997 生産技術硏究所論文集 Vol.13 No.-

In this paper, we designed, implemented and evaluated 32-bit CLA adder with the ENMODL(enhanced NORA Multiple Output Domino Logic) logic style which is new dynamic CMOS logic. The circuit is implemented using 0.8㎛ CMOS double-metal process technology. It operates stably and the addition time is less 3.9 ns. The ENMODL logic style can improve the performance in the high-speed computing circuits depending on the degree of recurrence.

牛耳島의 植物相과 植生에 關한 硏究

金喆洙,張允錫,吳長根 木浦大學校沿岸生物硏究所 1987 沿岸生物硏究 Vol.4 No.1

The flora and vegetation of Ui-do were investigated two times from July 23th to July 29th in 1985, and from July 8th to July 15th in 1985. The vascular plants identified in these investigations were 102 families, 302 genera, 376 species, 58 varieties and 4 formae, summing up to 438 species total. Of these species, 126 species were found commonly in the lists reported previously by Lee, etc. (1980) and Lee (1981). The total number of species in this island was thus summerized as 104 families, 323 genera and 481 species. Also Fisher's index was calculated as 426.4. This value was higher than that of Hong-do. By the ZM school method, the vegetaion of Ui-do was classified into 15 community types, i.e. the evergreen broad-leaved forests(Camellia japonica-Machilus thunbergii, Camellia japonica-Castanopsis cuspidata var. sieboldii, Camellia japonica community), the evergreen needle-leaved forests (Pinus thunbergii community), the deciduous forests (Mallotus japonicus, Carpinus coreana community), Pseudosasa japonica community, the grassland vegetation (Miscanthus sinensis var. purpurascens, Arundinella hirta-Zoysia japonica, pennisetum alopecuroides-Artemisia princeps var. orientalis, Agrostis clavata-Artemisia princeps var. orientalis community), the sand dune vegetation (Carex pumila, Imperata cylindrica var. koengii-Vitex rotundifolia, Ligustrvm quihoui var. latifolium community) and the grazing land. Each community was described in term of floristic, structual and environmental features. The synthesis table and the actual vegetaion map were prepared.

UV 및 젖산 처리에 의한 난각 표면의 Salmonella 억제 효과

손원근,이철현,강호조 한국수의공중보건학회 2002 예방수의학회지 Vol.26 No.4

The inhibitory effects were investigated of 254-nm ultraviolet (UV) radiation and lactic acid (LA) treatment on populations of Salmonella (S) enteritidis on eggshell surface. All UV exposures (730, 1,580, 3,000 W/cm²) for 30 sec significantly reduced S enteritidis (P 0.05). UV irradiation with 3,000 μW/cm² almost completely eliminated S enteritidis on inoculated eggshells by 99%. These results suggest that the higher intensity of UV irradiation may be associated with the higher germicidal activity. However, no significant differences were detected between UV exposure times. The treatments of LA at the concentration of 0.1, 0.3 and 0.5 % also specifically decreased the bacterial cell populations (0.91 1.14 log CFU) on the eggshell compared with the control (6.92 log CFU). The treatment of LA at the concentration of 0.5 % had the reaction of a 2.52 log unit storage for 9 days. The combined treatment of UV (3,000 μW/cm²) and LA(0.5%) decreased S enteritidis populations on eggshell by 3.85 log unit, compared wth the control (P 0.05), and its inhibitory effect was stronger with storage time.

珠島의 常綠闊葉樹林의 群落構造

金喆洙,吳長根 木浦大學校 基礎科學硏究所 1990 基礎科學硏究誌 Vol.8 No.-

Phytosociological investigation of the forest vegetation was carried out in Chudo island at the period of March 1th 1989 to December 31th 1989 by Braun-Blanquet's method. The list of vascular plants identified in these investigation were 61 families, 114 genera,116 species, 20 varieties and 1 formae summing up to 137 kinds total. Among them, herbaceous plants were 65 kinds, while woody plants 72 kinds. In the evergreen broad-leaved plants there were 28 kinds and rare plants were Actinodaphne lancifolia, Ilex integra, Dendropanax morbifera, Crypsinus hastatus, Aspidistra elatior, Monotropa hypopithys, Chimaphila japonica, Gardneria insularis etc. The forest vegetation was classified into 2 communities, Trachelospermum asiaticum var. majus-Castanopsis cuspidata var. sieboldii community, Trachelospermum asiaticum var. majus-Actinodaphne lancifolia community. Based on the classification of communities the distribution map of the forest vegetation in Chudo was drawn in 1:25,000 scale.

High-Volume 플라이애쉬 콘크리트의 기포조직에 관한 연구

강수근,서완용,정철우,김영수 釜山大學校生産技術硏究所 2002 生産技術硏究所論文集 Vol.61 No.-

산업 부산물인 플라이애쉬를 사용한 콘크리트는 내부에 존재하는 다량의 플라이애쉬에 의해 발생하는 공극의 분화 효과에 의해 보통의 콘크리트와는 다른 기포조직을 가질 수 있다. 콘크리트가 동결작용을 받을 시 발생하는 수압을 완화할 수 있는 기포의 영향범위는 기포간의 거리에 의해 결정되며, 이것의 최대값이 기포간격수라고 불리고 있다. 본 연구에서는 High-Volume 플라이애쉬 콘크리트의 기포조직을 카메라를 통하여 입력된 화상의 데이터를 컴퓨터에 의해 정략적으로 처리하는 화상분석법을 이용하여, 연행공기량과 플라이애쉬 콘크리트의 공기량, 비표면적, 기포간격계수 등을 보통 콘크리트와 비교, 분석함으로서 High-Volume 플라이애쉬 콘크리트의 기포조직을 파악하고자 한다. The purpose of this paper is to investigate the air-void spacing factor of high-volume fly ash concrete. For this purpose, the air-void spacing factor of the hardened fly ash concrete was determined by image analysis method for a large number of parameters adjusting such as air contents and the rate of fly ash replacement. Based on the study of the test results, the following conclusions may be drawn. 1) As the rate of fly ash replacement for high-volume fly ash concrete increases, air contents decrease. Furthermore the air content is varied approximately 1 % before and after hardening. 2) As the replacement of fly ash increases, the spacing factor increases due to adsorption of air entraining agent. 3) As the air content decreases and the specific surface increases, the spacing factor of High-Volume fly ash concrete increases.

誘導電動機 驅動시스템의 效率最適化 制御에 關한 硏究

吳哲洙,金興根 慶北大學校 1984 論文集 Vol.37 No.-

Induction motor drive losses can be reduced considerably by weakening the arigap flux. The airgap flux can be controlled indicrectly by adjusting the stator current and the slip frequency for current source inverter induction motor drive, and the voltage to frequency ratio for voltage source inverter induction motor drive. The current source inverter(CSI) has many inherent advantages and usually used to drive a high power induction motor. Thus, in this paper the principle of efficiency optimization technique for CSI fed induction motor drive is investigated and the control loop is suggested. All the control loop is implemented by using Z-SO microprocessor. The experimental results show the energy saving potential and the stable operation of the proposed system.

滌痰湯이 흰쥐의 高脂血症에 미치는 영향에 관한 實驗的 연구

김근우,구병수,이원철 동국대학교 경주대학 1997 東國論集 Vol.16 No.2

This study was done in order to investigate the effect of choˇkda~m-t'ang on hyperlipidemia. Methods: Hyperlipidemia was induced in male rats by oral administration of cholesterol(50㎎/㎏) diet for 45 days. To carry out an experiment, the rats was divided into three groups. The first group(normal group) was fed on water for 45 days. The second group(control group) was administered 5% ethanol instead of water only for first 15 days and subsequently administered cholesterol(50㎎/㎏ p.o) diet with 5% ethanol for the second 15 days and fed on a solution of salt for the last 15 days during total 45 days. The third group(sample group) was administered in the same way with the control group for 30 days and injected choˇkda~m-t'ang extract(100㎎/㎏) for the last 15 days during total 45 days. And measured the levels of serum total cholesterol, serum HDL-cholesterol, serum total lipid, serum triglyceride, serum phospholipid, hepatic lipid peroxide and activity of serum AST·ALT. Results: 1. From fifteenth day, the level of total cholesterol was decreased with the significance in the sample group as compared with the control group. 2. The level of serum HDL-cholesterol was increased in the sample group compared with control group, but did not show significance. 3. The level of serum total lipid was decreased with significance in the sample group as compared with control group. 4. The level of serum triglyceride was decreased with significance in the sample group as compared with control group. 5. The level of serum phospholipid was decreased in the sample group compared with control group, but did not show significance. 6. The level of hepatic lipid peroxide was decreased with significance in the sample group as compared with control group. 7. The activity of serum ALT was decreased with significance in sample group as compared with control group, but that of serum AST was not significance. Conclusion According to above results, it is considered that choˇkda~m-t'ang injection groups have recovering effect on the hyperlipidemia induced by oral cholesterol administration in male rats. This might be suggest that choˇkda~m-t'ang have recovering effect on arteriosclerosis and cerebral vascular accidents. Choˇkda~m-t'ang increase body's capacity of controling abnormal lipid metabolism, it can be used to prevent hyperlipidemia and related diseases.

동결 건조기의 최적 운전 기법

裵信徹,李近熙 단국대학교 1993 論文集 Vol.27 No.-

The problem of operating a freeze dryer to obtain a fixed final moisture content in minimum time is formulated as an optimal control problem. The energy radated from the heat plate, and total pressure in drying chamber are considered as control variables. Constraints are placed on the system state variables by the scorch point of the dried product and the melting point of the frozen interface. The optimum control policy at the beginning of the run, when neither of the two temperature constraints is active, has been establishen through a theoritical analysis under pseudo-steady state assumptions. For certain cases the nature of the overall optimum control policy has been found. The numerical solution of the steady and nonsteady state problem indicates that if a control policy is optimum for the steady state problem, then this control policy is also optimum for the nonsteady state problem.

多島海 海上國立公園內의 常綠闊葉樹林에 對한 植物社會學的 硏究(Ⅴ) : 所安島와 靑山島의 植生을 중심으로 The Vegetation of Soan-do and Chongsan-do

金喆洙,吳長根 木浦大學校 沿岸環境硏究所 1992 沿岸環境硏究 Vol.9 No.1

Phytosociological investigation of the forest vegetation was carried out in Soan-do and Chongsan-do at the period of August 1989 to September 1991 by Braun-Blanquet's method. The list of vascular plants identified in these investigation were 115 families, 357 geners, 445 species, 1 subspecies, 72 varieties, 5 formae and summing up to 523 kinds total. The forest vegetation was classified into 8 communities, Canmellia japonica, Castanopsis cuspidata var. sieboldii, Machilus thunbergii, Actinodaphne lancifolia, Pinus thunbergii, Carpinus coreana, Zoysia sinica and Salicornia hebacea community. Based on the classification of communities, the actual vegetation map was drawn in 1 : 50,000 scale.

大局屹島의 植物相科 植生에 關한 植物社會學的 硏究

金喆洙,吳長根 木浦大學校 沿岸環境硏究所 1993 沿岸環境硏究 Vol.10 No.1

本 調査는 1993年 6月 16日-17日까지의 期間에 전남 신안군 흑산면 대국홀도의 植生에 대하여 Braun-Blanquet의 植物社會學的 調査方法에 따라 實施하고 종조성표를 作成하여 6 個群落으로 區分하였다. 植物群落은 常綠闊葉樹林인 까마귀쪽나무군락, 동백나무군락, 보리밥나무군락, 落葉闊葉樹林은 예덕나무군락, 초지식물구락은 밀사초군락, 땅채송화군락 등으로 區分되었다. 現存植生圖는 1:50,000의 地形圖上에 植生單位를 基準으로 하여 岩壁을 區分하여 製作하였다. The vegetation of Daekukhul-do was invested by the phytosociological method of Braun-Blanquet's during 16-17th June, 1993. The forest vegetation was classified into 6 communities as follows. The evergreen broad-leved forests; Camellia japonica and Listsea japonica, Elaeagnus glabra community. The decideuous broad-leved forest; Mallotus japonicus community. The herbaceous plants ; Carex boottiana and Sedum oryzifolium community. Based on the classification, the actual vegetation map was drawn in 1 : 50,000 scale.