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월악산 신갈나무 ( Quercus mongolica ) 림의 종조성과 토양환경
이호준,전영문,김창호 ( Ho Joon Lee,Young Moon Chun,Chang Ho Kim ) 한국환경생물학회 1998 환경생물 : 환경생물학회지 Vol.16 No.2
The relationship between the floristic composition and soil environmental factors of the Quercus mongolica forest on Mt. Worak was investigated from May 1993 to February 1997. The Quercus mongolica -Lespedeza maximoiwiczii community was classified into two subcommunity of Quercus variabilis and Artemisia stolonifera. The dominance sequences on each stratum determined by the coverage index showed that Quercus mongolica was most dominant in tree-1 layer with 7569.6, and in tree-2 layer with 1211.4, Lespedeza maximoiwiczii in shrub layer with 896.9, and Ainsliaea acerifolia in Herb layer with 1480.8 value. The highest value of diameter breast height (DBH) was distributed in the range of 11 ∼ 20 ㎝ (41.1%) in Quercus mongolica forest and it showed a bell-shape distribution. Except soil water content, almost every data showed the lower value at 600∼850m than any other altitude. Species dominance was eminently Sasu borealis. Carex lanceolata at 400∼600m, Carex humilis at 600∼850 m and Fraxinus rhynchophylla, Acer pseitdo-sieboldianum, Ainsliaea acerifolia, Carex siderosticta at 860∼1060m, respectively. Soil conditions in NE-NW slope was more favorable than in SE-SW slope. In summary, Quercus mongolica, Acer pseudo-sieboldianum. Carex siderosticta, and Ainsliaea acerifolia were dominant in NE-NW slope, while Quercus mongolica, Fraxinus rhynchophylla, Spodiopogon sibiricus, and Carex humilis dominant in SE-SW slope.
Mn 과 Zn 이 소리쟁이 ( Rumex crispus L. ) 의 발아와 유식물의 (幼植物) 생장에 미치는 영향
이호준,윤영진 ( Ho Joon Lee,Young Jin Yoon ) 한국환경생물학회 1994 환경생물 : 환경생물학회지 Vol.12 No.2
The amounts of accumulation and the effects of manganese and zinc on the seed germination and the growth of seedlings were investigated in Rumex crispus L. after Mn and Zn treatments. The effects of Mn and Zn on the germination rate in R. crispus L. showed 84∼89% in the treatments of the below 50ppm in both Mn and Zn, whereas it showed 65% in 100ppm Mn and 79% in 100ppm Zn, which had a relatively high germination rate in high concentration. The relative growth rate in R. crispus L. exhibited a tendency of somewhat restrained growth in the higher concentration, but showed a good growth compared to control. The relative growth rate of length in R. crispus L. as concentrations of Mn and Zn increase from 5ppm to 100ppm revealed a tendency of somewhat restrained growth, but showed a good growth compared to control. The accumulation amount of Mn and Zn in organs of R. crispus L. showed a tendency to increase in order of its stem < leaf < root, and the more time passed by after its treatment and the higher the concentrations of its treatment were, the more amount of their accumulation appeared. These results suggest that R. crispus L. is not only strong in tolerance in the contaminated soil of Mn and Zn but contributable to the purification of the contaminated soil.
Executive Strength, Executive-Legislative Relations, and Budget Deficits
이호준,신재혁 한국국제정치학회 2014 The Korean Journal of International Studies Vol.12 No.2
Why do different countries experience varying levels of budget deficits? Common pool resource theorists argue that budget deficits tend to be low if the executive, who considers total tax burdens, suppresses the narrow incentives of individual legislators, who only consider partial tax burdens. Policy inertia theorists argue that a decrease in the number of veto players is associated with a low level of budget deficit. In this article, we combine the two approaches and offer a conditional common pool resource theory that predicts budget deficits to decrease as the executive strength vis-à-vis the legislature increases under parliamentarism because of the lack of legislative veto power. Under presidentialism, however, this effect is not likely to be significant because of the presence of legislative veto power. We support the argument through an analysis of cross-national data on budget deficits of 49 countries from 1995 to 2011.
다차원 패턴기술을 이용한 광대역 마이크로스트립 안테나 설계
이호준,박규호 한국마이크로전자및패키징학회 2004 마이크로전자 및 패키징학회지 Vol.11 No.1
본 논문은 wireless LAN 주파수 대역 (5725∼5825 MHz)에서의 다차원패턴기술(Photonic Band Gap : PBG)을 이용한 Yagi-Uda 안테나와 결합하여 광대역 마이크로스트립 패치 안테나를 구현하였으며, PBG Cell을 이용한 안테나와 이용하지 않은 안테나를 비교 분석하였다. PBG 구조를 적용한 안테나에서의 대역폭이 약 30 MHz 정도 더 넓게 나왔으며, 안테나의 이득 또한 1dB정도 더 높게 나왔는데 이는 Ground 면에 2차원적인 다차원 패턴 구조를 적용하여 안테나 표면을 따라 전파하는 전자파의 전송이 억제되도록 표면파의 발생을 효과적으로 차단했기 때문으로 분석된다. This paper demonstrates the detailed study of a microstrip Yagi-Uda antenna with and without PBG structure at wireless LAN(5725∼5825 MHz) frequency band. The impedance bandwidth of the antenna with the PBG holes is greater than (about 30 MHz) that of its counter part without PBG holes. The measured gains of the antenna at the frequency band are 7 dB and 6 dB respectively for antenna with and without PBG. The improvement of gain of about 1 dB is likely due to the suppression of surface wave.
COVID-19 동선 추적에서의 프라이버시 보호를 위한 Exposure Notification 기술에 대한 보안성 평가 및 대응 방안 연구
이호준,이상진 한국정보보호학회 2020 정보보호학회논문지 Vol.30 No.5
COVID-19 감염자의 동선을 파악함과 동시에 개인의 프라이버시를 보호하기 위한 방법들이 다양하게 제시되고있다. 그 중에서 애플과 구글에서 발표한 ‘Exposure Notification’은 블루투스를 사용한 탈중앙화 방식을 따르고있다. 하지만 이 기술을 사용하려면 항상 블루투스 기능을 켜 놓아야 하며 이를 통해 다양한 보안 위협이 발생할 수있다. 본 논문에서는 보안 위협 모델링 기법 중 ‘STRIDE’와 ‘LINDDUN’을 적용하여 Exposure Notification기술의 보안성을 평가하여 발생 가능한 모든 위협을 도출하였다. 또한 보안성 평가 결과를 가지고 대응 방안을 도출하고 이를 바탕으로 보안성을 향상시킨 새로운 모델을 제시한다. Various methods are being presented to identify the movements of COVID-19 infected persons and to protect personalprivacy at the same time. Among them, 'Exposure Notification' released by Apple and Google follows a decentralizedapproach using Bluetooth. However, the technology must always turn on Bluetooth for use, which can create a variety ofsecurity threats. Thus, in this paper, the security assessment of 'Exposure Notification' was performed by applying 'STRIDE'and 'LINDDUN' among the security threat modeling techniques to derive all possible threats. It also presented a new Dellthat derived response measures with security assessment results and improved security based on them.