• Korean Journal of Medicinal Crop Science
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• v.10 no.2
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• pp.126-131
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• 2002

We investigated the high yield capacity of Hwangchil lacquer for selection and identification of major aromatic components of the selected trees as well. The Hwangchil lacquer showed the difference yields by different habitat, tree ages and individual character. The selected trees showed high yield capacity of Hwangchil lacquer. We also investigated the essential oil contents and its the main components to analysis the potent of mass propagation. The major compounds were 1,6-atadiene-3-ol., ${\alpha}-terpinene,\;{\alpha}-cubebene,\;{\alpha}-ylangene,\;{\alpha}-copane,\;{\beta}-elemene,\;germacrene-D,\;{\beta}-selinene,\;{\alpha}-selinene,\;{\delta}-cadinene,{\gamma}-cardinene$, germacrene B, germacrene D-4-ol. The most principle component was germacrene D among them respectively. However, the difference of relative content ratio of each major compound was showed by individuals, population and native areas in the selected trees.

• Korean Journal of Environmental Agriculture
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• v.17 no.2
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• pp.117-121
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• 1998

In the study to reduce the error on the method of sampling pine needles to monitor the atmospheric concentration of polychlorinated biphenyls(PBCs),it was found that: 1. Concentration of PCBs almost linearly increased from new to three-years-old pine needles, so that the biomonitoring method using pine needles canbe applied to measuring long-term contamination from air in a local area. Needles of differernt age should not be mixed in sampling but be seperately analysed .It no good idea comparing PCB concentrations of differently aged needles. 2. Concentratio n of PCBs on pine needles had nothing to do whit the indivisual and age of the pine tree. 3. Concentration of PCBs on pine needles growing avobe was lower than that on needke below. 4. Concentration of PCBs on pine needles locatied in poorly ventilative places such as needle of a forest was lower than that on needles in well-ventilated areas.

• Korean Journal of Agricultural and Forest Meteorology
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• v.7 no.4
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• pp.289-295
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• 2005

This paper reports on the dendrochronological investigation of tree ring growth of Pinus densiflora in the Gyeongbuk region. Tree ring growth was analysed using basic statistical value and correlation analysis to evaluate the relative contribution of climatic factors. Ta extract age-related trends and nonclimatic signals, each measurement series was standardized using a negative exponential growth function. In the Gyeongbuk region, tree ring growth was positively correlated with the current year in February, March and April, January, February, and March precipitation showed a positive correlation with the current growth year. This suggests that climatic factors (monthly average temperature, precipitation) limit breaking of dormancy and promotion of growth of Pinus densiflora in the Gyeongbuk region.

• Clean Technology
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• v.19 no.4
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• pp.453-458
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• 2013

Fly ash has capacity to oxidize or adsorb mercury in a flue gas. Mercury oxidation and adsorption efficiencies of fly ash vary depending on the properties of fly ash. This study was designed to understand reaction characteristics of mercury with fly ash components. The fly ash components were tested to determine their oxidation and adsorption capabilities for elemental mercury and oxidized mercury. A sample was synthesized with fly ash components and tested. The test results were compared with those of the fly ash sample obtained from a coal-fired power plant. $Fe_2O_3$, CuO and carbon black showed higher oxidation or adsorption efficiency for elemental mercury while CaO, MgO, CuO and carbon black showed higher adsorption efficiency for mercury chloride. In addition, the synthesized sample showed comparable mercury oxidation and adsorption efficiencies to the fly ash sample.

• Korean Journal of Weed Science
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• v.6 no.2
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• pp.130-133
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• 1986

Glyphosate and 2,4-D were introduced into the vascular systems of Robinia pseudo-acacia L. (3-5cm diameter) with a syringe-type pressure injector in May, 1985. Robinia pseudo-acacia L. were completely controlled by 3 or 6 ml of 3050ppm glyphosate per tree and 6ml of 1000ppm 2,4-D per tree. Herbicidal efficacy was more effective by 6m1 of combined solutions of 1525ppm glyphosate and 500ppm 2,4-D per tree.

• Journal of Korea Water Resources Association
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• v.37 no.9
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• pp.737-744
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• 2004

In this study, to evaluate the effect of forest vegetation on the long-term water balance in a watershed, semi-distributed and physically based parameter model, SWAT was applied to the Bocheong watershed, and the variation of hydrological components such as evapotranspiration, surface flow, lateral flow, base flow, and total runoff was investigated with coniferous and deciduous forests, respectively. First, SWAT model was modified to simulate the actual plant growth pattern of coniferous trees which have the uniform value of leaf area index all the seasons of the year. The modified model was applied to the watershed that is assumed to have only one land cover in the whole watershed, and the variation of the water balance components was investigated for each land cover. It was found that coniferous forest affected the increase in evapotranspiration and decrease in runoff more than deciduous forest. However, the age and the density of stand, the location, and soil characteristics and meteorological conditions including the tree species should be also considered to examine the effect more quantitatively and to reduce the uncertainties in simulated output from the hydrological model.

• International Commerce and Information Review
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• v.1 no.1
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• pp.157-178
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• 1999

UNCITRAL에서 제정한 "UNCITRAL 전자상거래 모델법"과 우리나라의 "전자상거래 기본법(안)"을 참조하여 전자적 의사표시에 의한 계약성립상의 법적인 문제들을 검토하였다. 청약의 경우나 승낙의 경우 모두 전자적 의사표시 방식에 의하여 상대방에게 특정 정보를 보내는 송신(발신)시점과 이러한 정보를 상대방이 취득하는 수신(도달)시점과의 구분을 어떻게 정의할 것인가 하는 문제가 대두된다. 이와 관련하여 본고에서는 컴퓨터에 의한 계약성립상의 송신시점과 도달시점에 관하여 정리하였다. 작성자와 수신자간에 다른 별도의 약정이 없는 한, 전자적 의사표시의 송신시점은 송신된 전자적 의사표시가 작성자 또는 작성자를 대리하여 데이터 메시지를 발신한 대리인의 지배를 벗어나 어떤 정보시스템에 들어간 때가 된다. 여기에서 어떤 정보시스템이란 첫째로 당사자간의 컴퓨터가 컴퓨터망을 통해 직접 연결된 경우에는 상대방의 컴퓨터가 될 것이고, 둘째로 당사자들의 컴퓨터가 특정 전자사서함에 연결되어 그곳을 통해 전달하고 수령하는 경우에는 그 전자사서함이 될 것이다. 한편 전자적 의사표시가 인간에 의한 자연적 의사표시와 동일시될 수 있는가 하는 문체와 관련하여 본고에서는 이를 통일하게 약정함으로써 전자적 의사표시는 기존의 법률사실의 범주에 포함되는 것으로 파악하였다. 그리하여 우리나라 민법에서 자연적 의사표시와 관련된 내용들을 규정하고 있는 조항들을 토대로 연구하였다. 다만 컴퓨터의 기능을 인간의 구체적으로 완성된 의사를 단순히 표시하거나 전달하는 수준 이상으로 컴퓨터 이용자의 의사영역에 개입하는 것으로 파악함으로써, 컴퓨터를 이용한 전자적 의사표시의 전달과정에서 발생될 수 있는 특별한 문제들을 함께 검토하였다. 즉 그 대표적인 예로써 표의자의 착오에 의한 의사표시 중에서 입력된 자료에 하자가 있는 경우라든지, 정보처리장치의 이용에 하자가 있는 경우라든지, 정보처리장치나 프로그램 자체에 하자가 있는 경우라든지, 네트워크에 하자가 있는 경우 등과 같은 컴퓨터라는 수단을 이용한 의사전달과정에서 발생될 수 있는 법적인 문제들을 검토하였다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2015.10a
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• pp.374-377
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• 2015

O2O(Online-to-offline) service is the new commerce system form that mixed information search and payment of products and services from online and receipt of goods from offline. O2O commerce combine advantage of existing electronic commerce and redeem the critical point of each commerce circulation method, but earnings model is still lacking compared to development speed of O2O technology. Therefore this study drew common factor applied to O2O service to search success factor of O2O commerce on the point of view as a customer Centered by existing B2C electronic commerce, Mobile commerce, and service quality model of offline commerce included O2O commerce method. Further we suggest O2O success factor model combined new O2O success factor additionally reflecting qualitative research result based on drew O2O success service Quality factor.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
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• v.2 no.1
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• pp.83-108
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• 2007

This study conducted research over status of employment and living by collecting questions & answers from retired soldiers after service in ROK Army more than 5 years in last 5 years. As the methodology of this research, the status of employment has been provided from the Citizen Insurance Public Corporation, and conducted interviews for all individuals in addition to the receiving of questions & answers. Also, the statistic data prepared and submitted for Congressional Audit & Inspection from MND was also utilized for the purpose of research. In conclusion, the situation faced with retired soldiers after their retirement is showing the future of reflection of oneself to the personnel in active service who must do their best only for their duty to keep national security. If those personnel in active service are worrying about their future returning to civilian society after retirement, it will not only become an impediment to perform their duty but also bring invisible weakening of military power to defend our nation in result. This is the rationale for the necessity of providing support for social adaptation, reemployment and inauguration of retired soldiers.

• Korean Journal of Environment and Ecology
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• v.11 no.4
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• pp.493-505
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• 1998

To study vegetation structure and distance between trees of Pinus densiflora forest in Chayang-chon area, Soraksan National Park, thirty-nine plots(10m$\times$10m) were established. They were classified into two communities by TWINSPAN and DCA technique. In the Community I, P. densiflora(DBH 35~75cm, height 9~16m, age 60~80) dominated in canopy and were predicted to be changed by deciduous broad-leaved trees also. In the Community II, P. densiflora(DBH 9~26.5cm, height 9~16m, age 30~50m) dominated in canopy. It seemed that the community II would maintain P. densiflora community for a long time since P. densiflora dominated in both canopy and understory. Shonnon's diversity index was higher in the community II(1.4247) than in the community I(1.2978). The distantes between canopy trees were 4.92$\pm $2.14m in the community I and 2.41$\pm $0.97m in the community II. The regression between DBH in canpy and ecological distance was Y(Distance) = 0.06355$\times $(DBH)+1.51613.