청정지역과 도시지역의 오존농도 특성 연구

장광미,강창희,서명석,허철구,박경윤,이호근,김영준 濟州大學校 基礎科學硏究所 1996 基礎科學硏究 Vol.9 No.2

A study has been performed on the characteristics of rural and urban surface ozone concentration for the period of March 1992 to February 1993. The monitoring station of rural ozone is located at Kosan, Cheju and other urban monitoring stations are located at Seoul, Pusan and Kwangju. Rural's and urban's ozone data exhibit a distinct features in many ways. First, annual mean of rural ozone concentration is very high(42 ppbv) but urban's are very low(10~15 ppbv). Second, rural ozone data shows a seasonal variation with it's maximum in spring, and minimum in summer, but urban's show a seasonal variation with it's maximum in spring, and minimum in winter. Third, diurnal variation of rural data is very small but that of urban's are very large. Fourth, monthly mean of daily minimum of rural data is not low and shows a large seasonal variation, but those of urban's data are extremely low(<3 ppbv) and have no seasonal variations.

Global-MAHN에서 라우팅 오버헤드 개선에 대한 연구

張良根,金玄旭,李光培,吳世德,裵振勝,金在浩 明知大學校 産業技術硏究所 2007 産業技術硏究所論文集 Vol.26 No.-

In this Paper, we studied the mechanism that increases the network reliability and decreases network load in GMAHN environment based on the AODV routing protocol. This proposed algorithm is the research on the algorithm, minimizing network overhead by preventing unnecessary network overhead previously and adapting Local repair mechanism to efficient data transmission when route error happens in network, in GMAHN environment. To evaluate the proposed algorithm's performance, we analyzed the proposed algorithm and adapting in various experiment environment according to 5 experiment viewpoint such as node movement, gateway network zone, mobile node number, flow number. After evaluating the experiment, we confirmed better network improvement altogether through following result such as total average data reception rate's increase, average data transmission time's decrease, network overhead's decrease than existing GMAHN algorithm.

제주도 고산에서 수용성 에어로졸의 화학적 성분 분석

장광미,이호근,강창희,허철구,박경윤,서명석 濟州大學校 基礎科學硏究所 1996 基礎科學硏究 Vol.9 No.2

Atmospheric aerosols were collected by a High Volume Tape Sampler from March 1992 to December 1993 at Kosan, Cheju, korea. The water soluble ion concentrations in aerosol were analyzed. The concentrations of cations(Na+, K+, Ca²+, Mg²+, NH₄+) were determined by an Inductively Coupled Plazma(ICP) or an Atomic Absorption Spectrometer(AAS), and those of anions(Cl-, NO₃-, SO₄²-) were analayzed by the capillary electrophoresis method. The Ca²+, SO₄²-and NO₃- concentrations in spring were higher than those in other seasons. The lowest concentrations of these elements were found in summer, largely due to scavenging by frequent rains. Especially the ca²+ concentration on April was three to four times higher than the annual mean concentration. The enrichment factor(E.F.) of each element was calculated. The annual mean E.F. values of the Ca²+, Mg²+ and Cl- in 1992 were the same as those in 1993 except K+ and SO₄²-. The correlation formula between all cations and anions for the whole period was Anions=0.759xCations+0.066.

열수처리한 티타늄 양극산화 피막의 특성 평가

장인호,이광원,배태성 大韓齒科器材學會 2004 대한치과재료학회지 Vol.31 No.1

This study was performed to investigate the surface properties of electrochemically oxidized pure titanium by anodic spark discharging technique. Commercially pure titanium plates of 20?0? ㎜ in dimensions were polished sequentially from #220 to #600 emery paper. Each sample was ultrasonically washed in ethyl alcohol and acetone for 5 min and dried in a desiccator. The anodization was performed up to 300 V using a regulated DC power supply at a current density of 30 ㎃/㎠. Aqueous solutions containing β-glycerophosphate disosium salt hydrate, calcium acetate hydrate and HEPERS were used as electrolytes. The surface oxide film was characterized by scanning electron microscope(SEM), energy dispersive X-ray microanalyzer (EDX) and X-ray diffractometer(XRD). The main crystal structure of the anodic oxide film was anatase type as analyzed with thin-film X-ray diffractometery. Needle-like hydroxyapatite (HA) crystals were observed on anodic oxide films after the hydrothermal treatment for 2 hours. The precipitation of the HA crystals was greatly accelerated by hydrothermal treatment and fine asperity-like HA crystals were observed after being immersed in Hanks‘ solution at 37℃. The Ca/P ratio of the precipitated HA layer was equivalent to HA as increasing the time of immersion in Hanks‘ solution. The tensile bond strength was decreased with precipitating the HA crystals by hydrothermal treatment.

설악산 국립공원의 어류분포

장민호,조가익,하진용,정광석,박성배,주기재 한국어류학회 2002 韓國魚類學會誌 Vol.14 No.4

설악산 국립공원지역 산간계류의 17개 지점에서 2000년 6월부터 2001년 6월까지 어류상 및 이화학적 요인을 계절별로 총 4회에 걸쳐 분석하였다. 모든 조사지점은 1~3차의 하천으로 비교적 물리·화학적 교란이 적었으며 하천폭은 5~30 m 정도였다. 채집된 어류는 총 18과 42종 2,557개체였고, Cyprinidae는 16종으로 84.7%의 상대풍부도를 나타냈으며, Gobiidae 4종, 5.0?의 상대풍부도를 보였다. Cyprinidae는 전체 채입종의 37.2%를 나타냈다. 우점종은 Zacco temminck로 10개 지점에서 738개체가 채집되어 28.9%의 상대풍부도를 나타냈으며, 아우점종은 Rhynchocypris kumkangensis와 Z. platypus로 각각 4개 지점 648개체(25.3%)와 7개 지점 344개체(13.5%)로 나타났다. 한국고유종(Korean endemic species)은 모두 4과 11종 781개체로 30.5%의 상대풍부도를 나타냈으며, 고유화 빈도는 25.6%로 한국의 평균 고유화 빈도와 유사하게 나타났다. 본 조사에서 외래어는 채집되지 않았다. 국립공원 내에 서식하는 어류의 다양성 유지와 회복을 위해서는 공원 내는 물론 경계지역 하천의 체계적인 관리가 요구된다. The fish fauna of mountain streams in the Seorak National Park area was investigated from June 2000 to June 2001 (4 times). All 17 sites were relatively undisturbed 1st to 3rd order streams. A total of 2,557 individuals were collected and classified into 17 families and 43 species. Cyprinidae accounted for 37.2% (16 species) of the total fish species and 84.7% (2,165 ind.) of the total abundance. Subdominant families were Gobiidae (4 species, 5.0%) and Balitoridae (3 species, 3.4%). Zacco temmincki (RA 28.9%, 10 sites) dominated. Subdominant species were Rhynchocypris kumkangensis (25.3%, 4 sites) and Zacco platypus (13.5%, 7 sites). Eleven of the species are endemic to Korea (4 families, 30.5%). Exotic species were not collected in this survey. Fish diversity was higher in streams around the boundary area than in the national park. Therefore, management of streams in the boundary area to protect the fish biodiversity can be efficiently conducted. Habitat degradation should be reduced for the conservation and restoration of fish diversity.

수산물 도매시장의 유통정보화 구축 효과

장영수,박광호 한국식품유통학회 2005 食品流通硏究 Vol.22 No.1

The purpose of the study are summarized as follows First, it has researched the possibility of the Distribution Information application in Sea Food Wholesale Market. Second, the effects which the Wholesale Market Company and the Intermediary Wholesaler Corporations can obtain in Sea Food Wholesale Market by building up a Distribution Information are classified into the effects of task, cost, and competition. It has analyzed the influence of these effects in direct and indirect Trust between the Wholesale Market Company and the Intermediary Wholesaler. Third, it has recognized the upcoming problems in Sea Food Wholesale Market by building up a Distribution Information, and it has suggested a plan to make the Distribution Information application successful in Sea Food Wholesale Market. This study has used a questionnaire to verify 5 hypotheses. Research model, factor analysis, correlation relationship analysis. The result of this study are summarized as follows : Building up the Distribution Information influences positively on the effectiveness of task, cost and competitiveness regardless of it being the Wholesale Market Company or the Intermediary Wholesaler corporation. However, the results of this analysis are to verify differences according to the degree of construction of the Distribution Information and the degree of the perception of the problems between the Wholesale Market Company and the Intermediary Wholesaler corporations have shown that there were distinct differences in the degree of computerization and of efforts to build a Distribution Information. Also there were distinct differences according to the degree of perceiving problems relating to building up the Distribution Information and the stages of the Distribution Information between the Wholesale Market Company and the Intermediary Wholesaler corporations.

전단-스팬비가 작은 고강도 철근콘크리트 보의 진단성능

장일영,최광진,송재호 金烏工科大學校 1993 論文集 Vol.14 No.-

This paper is an experimental study on shear capacity of the high strength R/C beams with a shear span-depth ratio between 1.5 and 2.5 A total of 15 beams was tested to determine diagonal cracking and ultimate shear strength. The major variable are shear span-depth ratio(a/d=1.5, 2.0, 2.5), vertical shear reinforcement ratio?? and concrete compressive strength??. Test results indicate that ACI 318-89 Eq(11-31) generally underestimates shear strength carried by vertical shear reinforcements, and the mode of failure may change from shear tension to shear compression for the beams having higher Vs than 75%, thus the effectiveness of r fy on ultimate shear strength(Vu) decreased.

處容舞 氣功에 關한 硏究

金光湖,張東淳 대한동의병리학회 1993 동의생리병리학회지 Vol.8 No.-

연구배경 : 춤사위(動作)의 형태가 각종 기공에서 보는 동작과 너무나 유사한 점이 많고 도인안교 의 동작이 舞에서 由來되었다는 것과, 處容舞는 太極·陰陽·五行의 要素로서 구성된 처용무의 동작과 호흡에 의념을 배합하면 기공의 기본 구성요소인 調神·調息·操心이 완전히 같게 되므로 일반 기공에서 나타나는 효과가 기대될 것으로 사려되어 연구하게 되었다. 방법 : 處容舞의 발생과정과 傳承脈絡에 대하여 그 역사성과 전통성를 考究하고 나아가서 舞의 구성원리와 사상을 밝혀 氣功舞로서의 성립배경을 정립시키고자 동작 및 당시의 사회 풍속에 대하여 문헌을 통하여 고찰해 보았다. 결과 : 처용무 기공은 良性 意念으로서 起, 承, 轉, 結로 나누어 살펴볼 수 있다. 起(導入部)는 太極과 陰陽을 象하며, 承(連結部)은 五行과 展開를 象하고, 轉(重要部)은 人象·陽象·天圓象·陰象·地方象하고, 結(終結部)은 太極을 象하며 退場한다. 결론 : 처용무를 습독하여 활용한다면 일반 기공에서와 비슷한 효과를 얻을 수 있을 것으로 생각된다. It was made an observation on Cheyong Dance, Korean Royal mask dance, with its historic, literatural aspects and its forms that last long 1. Cheyong dance was formed with the Great Absolute, Yin and Yang, Five elements. Movement of cheyong dance was formed with Hado, Nakseo, Balance, Great absolute and its progress by the 4 steps(the introduction, the development of the theme, conversion and summing up), as the Royal Dance did. 2. Cheyong dance was expected to have the same effect of Gigong when it matched with the movement, respirtory and spirit. 3. Cheyong dance was expected to prevent and cure the adult disease when it applied by the way of gigong.

고강도콘크리트에 대한 응력-변형율 곡선과 응력블럭의 제안

최광진,송재호,장일영 國立金烏工科大學校附設生産技術硏究所 1995 産業技術開發硏究 Vol.11 No.-

The object of this paper is to propose stress-strain curve and stress block for high strength concrete. Using the established experimental data that have been presented in various documents the stress-strain relationship curves of high strength(400∼700kgf/㎠) models are presented based on both methods of logarithm regression analysis and multiple regression analysis adopted in order to establish the relationships between design parameters. And area under proposed stress-strain curve is compared with trapezoidal stress block area and rectangular stress block area using Simpson's composite formula. It is shown that the stress block of trapezoid could be regarded as that of high strength concrete. Furthermore, the results of this paper is expected to be accomodated to other important design parameters of high strength concrete.

몬테카를로 방법을 이용한 고강도콘크리트 구조물에 대한 휨변형의 해석적인 연구

최광진,장일영,송재호,홍원기 金烏工科大學校 1995 論文集 Vol.16 No.-

The object of this thesis is an analytical study on flexural deformation of high strength concrete structures using Method. Using the established experimental data that has been presented in various documents the stress-strain relationship curves of high strength(500㎏f/㎠) models are proposed. Based on both methods of logarithm regression analysis and multiple regression analysis adopted in order to establish the relationships between design parameters, responsed random variables and flexural deformation analyzed using monte carlo simulation and simpson composite formula. Additional random variables are introduced to incorporate both the confidence in the analytical accuracy of engineering mechanics associated with structural response quantities and the uncertainty in the construction quality control. The result is expected to accomodate other important design parameter of high strength concrete design in treating reliability theory that practicing engineers and structural engineering.