LTE기반 철도용 휴대용 단말기 연구

송용수(Yongsoo Song),김용규(Yong-Kyu Kim),심봉규(Bongkyu Sim),조아람(A-ram Jo) 한국통신학회 2013 한국통신학회 학술대회논문집 Vol.2013 No.11

리기다소나무와 낙엽송 인공림의 지역 및 임령에 따른 토양 특성

양아람 ( A Ram Yang ),황재홍 ( Jae Hong Hwang ),조민석 ( Min Seok Cho ),송선화 ( Sun Wha Song ) 한국산림과학회 2013 한국산림과학회지 Vol.102 No.4

This study was performed in Pinus rigida and Larix kaempferi plantations which occupy approximately 60% of artificial forest area in Korea. The objective of this study was to know the differences in soil physical and chemical properties between both plantations. Soil physical and chemical properties from published literature and analyzed soil data in national forest in 2010 and 2011 were analyzed by plantation regions and stand age of 5 years unit. Jeollanamdo in Pinus rigida plantations and Gyeongsangbuk-do in Larix kaempferi plantations showed higher soil chemical properties than those of other regions. Soil texture in both plantations was almost loam and sandy loam. Mean soil pH in Pinus rigida and Larix kaempferi plantations were 4.86 and 4.87, respectively and there was no relationship between soil pH and stand age. The mean concentrations of total nitrogen (%) and available phosphorus (mg kg-1) were 0.21 and 11.00 for Pinus rigida plantation and 0.28 and 13.32 for Larix kaempferi plantation. In Larix kaempferi plantation, total nitrogen, available phosphorus and organic matter concentrations and C.E.C. were higher than those in Pinus rigida plantation and showed positive relationship with stand age. This positive relationship was also revealed between the exchangeable cations and soil pH. The results of this study provide an informative data in selecting tree species for planting and contribute to the establishing forest management plan for the maintenance of sustainable forests resources.

40-50대 중년여성의 노화인식에 따른 피부관리행동 연구

송아람 ( A-ram Song ),김현경 ( Hyeon-gyeong Kim ),최미옥 ( Mee-ok Choi ) 한국미용학회 2024 한국미용학회지 Vol.30 No.2

The paper aimed to investigate the perception of aging and corresponding skincare behaviors among women in their 40s and 50s. A survey was conducted from September 1, 2023, to October 10, 2023, involving 221 women aged 40 to 50. Data collected were analyzed using SPSS WIN 25.0. Frequency analysis was conducted to understand the general characteristics of the respondents and their perception of skin aging symptoms. Cross-analysis was performed to determine if there were differences in skincare behaviors based on the perception of skin aging symptoms. The results indicated that the onset of skin aging was generally perceived to begin in the late 30s, with particular concern about eye wrinkles. The initial recognition of skin aging was primarily through the appearance of eye wrinkles, with 47.5% of respondents identifying increased fine lines as the main symptom. Participants generally perceived their skin aging rate as slow compared to others. Analysis of preferred skincare methods to delay skin aging revealed statistically significant differences based on the perception of skin aging symptoms (p<.05). Regarding self-care methods for the skin, statistically significant differences were observed based on the perception of skin aging rate (p< .05). However, no statistically significant differences were found in the frequency of skincare investment based on the perception of skin aging symptoms (p >.05). The study also identified a desire among participants to hide or improve aging through professional skincare. Thus, it is suggested that promotional strategies for skincare tailored to middle-aged women and educational initiatives based on professional expertise should be implemented to enhance opportunities for healthy aging among this demographic.

LTE기반 철도용 승무원 단말 연구

송용수(Yongsoo Song),김용규(Yong-Kyu Kim),심봉규(Bongkyu Sim),조아람(A-ram Jo) 대한전기학회 2013 대한전기학회 학술대회 논문집 Vol.2013 No.10

LTE기반 철도용 승무원 단말 연구

송용수(Yongsoo Song),김용규(Yong-Kyu Kim),심봉규(Bongkyu Sim),조아람(A-ram Jo) 대한전기학회 2013 정보 및 제어 심포지엄 논문집 Vol.2013 No.10

낙엽송림과 리기다소나무림 벌채지 내 토양 특성과 식재된 소나무 및 낙엽송 묘목의 초기 생장 비교

황재홍 ( Jae Hong Hwang ),양아람 ( A Ram Yang ),송선화 ( Sun Wha Song ),조민석 ( Min Seok Cho ) 한국산림과학회 2013 한국산림과학회지 Vol.102 No.3

The objectives of this study were to compare soil physical and chemical properties and early growth of Pinus densiflora and Larix kaempferi seedlings in harvested Larix kaempferi and Pinus rigida stands. Study stands were located in harvested L. kaempferi (Yeongju) and Pinus rigida (Wonju) plantations. Seedlings of L. kaempferi (1-1) and P. densiflora (1-0) were planted in April, 2008, Yeongju. Also, seedlings of L. kaempferi (1-1) and P. densiflora (1-1) were planted with the density of 3,000 seedlings/ha in April, 2010, Wonju. We analyzed soil physical and chemical properties and the relative growth rate of seedlings using diameter at root collar and seedling height. Soil organic matter, total nitrogen and available phosphorus concentrations in harvested P. rigida stand were significantly higher than those in harvested L. kaempferi stand. The relative growth rate of P. densiflora seedlings with former stands were not significantly different. The relative growth rate of diameter at root collar of L. kaempferi seedling in harvested P. rigida stands were significantly higher than that in harvested L. kaempferi stand. Higher concentrations of organic matter, total nitrogen and available phosphorus in harvested P. rigida stand was probably positively affect to the early growth of seedlings.

국가철도 통합무선망 시험선 구축 연구

김용규(Yong-Kyu Kim),송용수(Yong-soo Song),조아람(A-ram Jo) 한국통신학회 2013 한국통신학회 학술대회논문집 Vol.2013 No.6

현재 국내 철도 관련 무선통신 방식은 노선별로 상이하여 비효율적으로 운영되고 있다. 실제로 관제요원, 열차운전자, 현장 유지보수 요원 간 협업이 어려워 다양한 문제점이 발생하고 있으며, 상이한 철도 무선통신 시스템 간 단절 및 불통 현상, 상용망과 기존철도 무선통신시스템과의 주파수 간섭 및 혼신 등에 따른 철도 운행 중단 및 철도 사고 발생 위험이 존재하고 있다. 이에 미래 철도의 안전 확보 및 수송 효율성 향상을 위한 국가철도 통합무선망 구축 관련 연구가 크게 부각되고 있으며, 이러한 요구에 맞추어 무선통신열차제어연구단에서는 철도전용 통합무선망 연구 과제를 2012년 4월부터 진행 중에 있으며 현재는 통합무선망(LTE-R)에 대한 성능 시험을 대불선에서 2013년 5월부터 실시하고 있다. 본 논문은 국가철도 통합무선망 시험선 구축에 관련된 내용이다.

상수리나무 임분 내에서 벌채 유형에 따른 조림목의 생장 특성

신유승 ( Yu Seung Shin ),송선화 ( Sun Hwa Song ),양아람 ( A Ram Yang ),황재홍 ( Jaehong Hwang ),박용목 ( Yong Mok Park ) 한국환경과학회 2014 한국환경과학회지 Vol.23 No.6

The objective of this study was to evaluate the effect of cutting types on microclimate and growth characteristics of afforested tree in Quercus acutissima stand after different types of cutting. The difference in temperature reaching 5.2℃ was shown in between clear cutting and selective cutting treatments. On July and August days with temperatures more than 35℃ often appeared in clear cutting stand. The values of VPD in July and August were higher than those in other months. Maximum VPD of 3.99 kPa was shown in clear cutting stand on May 23 as a prolonged rainless days appeared. However, VPD in selective cutting stand always stayed under 3.0 kPa throughout growing season. A higher intensity was shown in clear cutting and strip clear cutting stands, reaching to more than 1,600 μmol m-2 s-1 at midday on early August, while that in selective cutting stand stayed about 1,500. In relative growth rate selective cutting stand showed a significantly higher relative growth rate in plant height than those in other cutting stands (p<0.05). The number of leaf in current-year branches significantly increased in selective cutting stand, whereas no increase was shown in clear cutting and strip clear cutting stands (p<0.05). In addition, relative elongation rate of current year branch also showed higher values in selective cutting stand compared with that in strip clear cutting stand (p<0.05). However, leaf mass per unit area (LMA) was higher in order of strip clear cutting, clear cutting, and selective cutting stands. From these results it is concluded that environmental conditions in clear cutting and strip clear cutting stands during growing season are more stressful to afforested tree species, resulting in lower relative growth in plant height, elongation of current-year branches, and leaf number per branch compared with those in selective cutting stand. Consequently, more data must be accumulated in the field to find out best cutting type in plantation considering the adaptational characteristic of each tree species varies with species and life span of tree is long.