출장보고 - 싱가포르 오일허브 현황 및 싱가포르에 관한 단상

박원제,Park, Won-Je 대한석유협회 2016 석유와 에너지 Vol.300 No.-

훼손지 비탈면 녹화용 식물소재로의 문수조릿대의 적용성 연구

장형태 ( Hyung Tae Jang ),박원제 ( Won Je Park ),김남춘 ( Nam Choon Kim ),박종민 ( Jong Min Park ) 한국환경복원기술학회(구 한국환경복원녹화기술학회) 2012 한국환경복원기술학회지 Vol.15 No.1

The study of Arundinaria munsuensis Y. Lee to this day was limited to the field of morphological species classification since its first discovery at Jiri mountain in the late 1990s. This native plants, one of Korean endemic species found in Jiri Mt. necessitates further studies about its use as revegetation plants or groundcover plants in urban areas. This study was launched from this need followed by summaries of results below related to its usage. This targeted species is a native Korean species which its natural distribution on the subalpine zone has merit for the wide range of climatic adaptation. Also, the coverage rate reached 78.3% in three years mostly by rhizome growth with an expectation of full coverage in four years providing less maintenance needs after planting. The net price for the construction of pot seedling methods of this plants is relatively economical than other normal revegetation construction methods. For these reasons, drilling for the plants on cut and fill soil slopes driven from pot seedling adapts Arundinaria munsuensis Y. Lee as efficient revegetation plant. Total construction cost for pot seedling work(30㎝×30㎝) of Arundinaria munsuensis was approximately 21,000won which is in reasonable price range when compared to other revegetation construction methods of disturbed slopes. As a native Korean plant, Arundinaria munsuensis has wide range of climatic adaptation with less maintenance requirement after planting. This study may suggest a strong possibility of Arundinaria munsuensis as a pot planting material in sloped area.

문수조릿대 개체군의 식생

장형태 ( Hyung Tae Jang ),이지혜 ( Ji Hye Lee ),박종민 ( Chong Min Park ),김남춘 ( Nam Choon Kim ),박원제 ( Won Je Park ),송호경 ( Ho Kyung Song ) 한국환경복원기술학회(구 한국환경복원녹화기술학회) 2012 한국환경복원기술학회지 Vol.15 No.1

Arundinaria munsuensis population were classified into Lespedeza maximowiczii dominant population and Spiraea prunifolia for. simpliciflora dominant population in the habitat of Jiri Mt. In the study sites, soil organic matter, total nitrogen, available phosphorous, exchangeable K, exchangeable Ca, exchangeable Mg contained, cation exchange capacity, and soil pH were ranged from 14.52~16.13%, 0.57~0.59%, 5.57∼10.24 (㎎/㎏), 0.44∼0.49 (cmol+/kg), 0.62∼0.92 (cmol+/kg), 0.31∼0.32 (cmol+/kg), 28.26∼32.44 (cmol+/kg) and 4.33~4.48 respectively. DCCA ordination analysis showed that Lespedeza maximowiczii dominant population dwells where pH, exchangeable Ca and exchangeable Mg content are high and Spiraea prunifolia for. simpliciflora dominant population is placed where CEC, total nitrogen and organic matter content are high.

수직 브릿지만에서 도가니 회전에 따른 Terfenol-D의 편석 거동 변화

김종철,박원제,이진형,예병준 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.9

In this study, we investigated the segregation behavior of Terfenol-D in vertical Bridgman growth with steady ampoule rotation. In Bridgman growth of Terfenol-D, the axial macrosegregation occurs due to the compositional inhomogeneity of initial melt and microsegregation due to the Tb-Dy-Fe ternary phase diagram. Because the melt segregation which causes axial macrosegregation was hard to diminish by buoyant or solutal convection, we introduced the steady ampoule rotation technique to change the flow pattern and investigated the influence of the intensity of melt stirring on segregation behavior. The results showed that as the rotation speed was increased, axial segregation and microsegregation were both diminished. Besides, both segregation were also affected by the growth rate so that its effect was discussed.

초크랄스키법을 이용한 Terfenol-D 성장시 희토류 원소의 손실과 거시편석 거동

김종철,박원제,이진형,예병준 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.7

Giant magnetostrictive material Terfenol-D was grown by Czochralski method in various melt temperature under purified argon at 1.2 atm and the macrosegregation of RE along growth direction was investigated. It can be expected that concentration of RE elements follow the Burton-Prim-Slicter relation in Czochralaki system. However, the aspects of macrosegregation were changed with melt temperature: At lower melting temperature, RE elements concentration increased slong growth direction, while at higher, it decreased. This was due to the change of melt composition during growth caused by loss of RE. Therefore, we discussed the reaction of RE with crucible and evaporation through free surface, which are the main reasons of RE loss. In addition, the macrosegregation was discussed considering the loss of RE with melt temperature.

전경대원에서 발생한 결핵의 임상 양상

문창기,박상준,조민구,김영중,김소연,김윤권,정준오,안석진,김은실,서승오,김지훈,최원제,이윤영,박형기,최규영,김현근 대한감염학회 2006 감염과 화학요법 Vol.38 No.6

Background: The purpose of this study was to document the incidence and clinical characteristics of patients with tuberculosis (TB) in combat and auxiliary police, living in a group, in Korea where the incidence rate of active TB in a general population is higher than in Western countries. Materials and Methods:We retrospectively reviewed the medical records of all tuberculosis patients diagnosed at National Police Hospital from January 2002 through December 2004. Results:In 2002-2004, a total of 156 cases of tuberculosis were identified with the mean (Standard deviation) age of 20.6 (±1.0) years. Of these, 134 (85.9%) patients were registered as new cases, 11 (7.1%) as relapse, 2 (1.3%) as failure, 5 (3.1%) as treatment-after-default cases whereas 4 (2.6 %) patients were not included in any categories. Average annual new TB rate and smear-positive TB rate were 86.5/10^(5) and 17.4/10^(5) person-years, respectively. In 12 of 31 smear-positive cases, time from onset of symptoms to diagnosis was more than 30 days. Two multidrug-resistance TB cases were identified and two suspected outbreak episodes of TB had occurred during 3 years. Conclusion:There was no statistically significant difference in the incidence rate of new cases of TB between the general population aged 20 to 29 years and combat and auxiliary police in Korea. 배경 : 국내 결핵의 발생은 감소 추세에 있으나 여전히 후진국형 발생양상을 보이고 있다. 특히 집단생활을 하는 젊은이들에서 발생하는 결핵의 유행이 간헐적으로 알려지고 있어 우려를 낳고 있다. 이에 저자들은 최근 전경대원의 결핵 발병 양상에 대해 알아보고자 본 연구를 시행하였다. 재료 및 방법 : 2002년 1월부터 2004년 12월까지 3년간 경찰병원에서 결핵 진료를 받은 전경대원의 의무기록을 후향적으로 분석하여 연도별 결핵 신환발생률, 도말양성결핵 신환율, 진단 지연, 집단발병, 다제내성결핵을 조사하였다. 결과 : 연도별 결핵 신환자 수(10만명당 발생추정치)는 2002년 50명(83.6명), 2003년 42명(83.7명), 2004년 42명(93.5명)이었고 도말양성 폐결핵 신환자 수는 2002년 10명(16.7명), 2003년 11명(21.9명), 2004년 6명(13.4명)이었다. 3년간 도말양성 폐결핵 환자는 31명이 있었고 그 중 12명은 호흡기 증상 발생 30일이 지나서 진단을 받았다. 다제내성 결핵은 2명이 있었으며 결핵의 집단발병이 의심되는 사례는 2차례 있었다. 결론 : 전경대원과 20-29세 연령군 일반인의 결핵 신환발생률, 도말양성 폐결핵 발생률의 통계적으로 유의한 차이는 없었다.

Bridgman 법을 이용한 Terfenol-D 의 응고 특성 연구

김종철,이진형,김지훈,예병준,박원제 대한금속재료학회(대한금속학회) 1998 대한금속·재료학회지 Vol.36 No.10

In this study we have conducted experiments for alloying Tb-Dy-Fe of which the target composition was Tb_(0.27)Dy_(0.73)Fe_(1.95) to achieve energy efficiency and mechanical strength. Because of the high oxidizing tendency of rare earth metals, Tb, Dy and the high vapour pressure of Dy, the charging composition had to be adjusted to Tb_(0.27)Dy_(0.73)Fe_(1.69). After alloying, Terfenol-D rods were grown in directional solidification by Bridgman technique and the solidification characteristics was investigated as function of solidification conditions. It was found that the characteristics primarily depended an the temperature gradient and the cellular-dendrite transition occurred at the growth rate around 25 ㎛/s. The morphology of dendrite was plate type and these dendrite plates displayed a strong preference of <112> alignment along growth direction. The magnetostriction measurements were performed at various pressures and magnetic fields. With 3N purity of elements, the maximum strain(λ_(max)) was increased from 887 to 1000 ppm at 7.35 MPa as the interface morphologies were changed from dendrite to cellular.