Impacts and Countermeasures of Climate Change on Food Supply

Kim Chang-gil,Jeong Hak-kyun,Han Suk-ho,Kim Jeong-seung,Moon Dong-hyun 한국농촌경제연구원 2013 한국농촌경제연구원 기본연구보고서 Vol.- No.-

Climate change has become a megatrend that will lead to significant changes in future society. Korean and overseas agencies specializing in climate forecasts predict that average global temperatures will continue to rise. While climate change may potentially have certain positive impacts for crop yields, the overall impact is predicted to be negative for environment and food security. In this context, our study aims to suggest a plan for systematically establishing a stable food supply system in Korea in respose to climate change. Various analytical models were employed, including: a response analysis based on questionnaire for farmers, panel-based analysis of the causes of pests and diseases in rice production, a random-effects model for panel data of extreme weather impact, and an analysis of food supply effects using the Simulation Model for Climate-Agriculture Relations (SIMCAR) integrated model in conjunction with the Crop Estimation through Resource and Environment Synthesis (CERES) model of the Korea Agricultural Simulation Model (KASMO). An analysis was made of major grain yields by means of the KREI-KASMO. This revealed reduced yields and area in comparison with the baseline in 2050, resulting in a reduction of rice production by 17.8%p in the RCP8.5 scenario, and reduction of soybean by 21.2%p and reduction of barley by 13.7%p in the A2 scenario. Self-sufficiency ratio of major grains in 2050 drawn from the SIMCAR revealed that the climate change scenario for rice showed 55.0% to be reduced by 18.3% in comparison with the baseline. It is predicted that selfsufficiency ratio in rice will drop to 50% which means a half of consumed rice should be imported. Key tasks for building a stable food supply system to cope with climate change were developed based on the domestic production capacity, the buffering capacity to climate change, import capacity from other countries, and policy performance capacity with reference to the empirical analysis. First, the suggested key tasks for improving the domestic production capacity include developing and disseminating adaptation technology, conserving farmland and expanding arable land, practicing climate-smart agriculture by using fusion technology, and modernizing infrastructure for agriculture. Second, key tasks for improving buffering capacity to climate change are improving resilience and biodiversity, building a risk management system, and further improving storage of food in Korea and other countries. Third, major tasks for improving the import capacity from other countries are constructing overseas food bases, effectively using the international grain market, and enhancing international cooperation with relevant countries. Finally, key tasks for improving policy performance capacity are refining and applying the climate change impact analysis model with respect to policies, expanding investments in research and development, building a vulnerability assessment system, enhancing education and training, and installing Climate Change Response Center for Agriculture (tentative). In this study, several key challenges were presented in the four different areas related to building a stable food supply system which can help overcome the challenges of climate change. It is expected that the nature of the policies that need to be prioritized and promoted, given the constraints of budget, organization and information will be addressed in future research. Also, in order for the solutions for key challenges to work properly in the field such that policy outcomes will be maximized, a consortium of research bodies in the related fields of agriculture, agricultural meteorology and agricultural economics should be created. As preparation for specific action programs. Furthermore, follow-up studies should be conducted to verify the expenses required for developing reliable climate change impact assessment models and the effectiveness of the enforced policies. Such fie

금연실천단계의 영향변인에 대한 연구

장성옥,박창승 고려대학교 2001 간호학논집 Vol.3 No.-

아세틸 콜린 유발 검사시 허혈성 심전도 변화와 흉통의 발생이 내피세포 기능장애에 미치는 영향

최철웅(Cheol Ung Choi),나승운(Seung-Woon Rha),김선원(Sun Won Kim),나진오(Jin Oh Na),임홍의(Hong Euy Lim),김진원(Jin Won Kim),김응주(Eung Ju Kim),한성우(Seong Woo Han),박창규(Chang Gyu Park),서홍석(Hong Seog Seo),오동주(Dong Joo Oh) 대한임상노인의학회 2010 대한임상노인의학회지 Vol.11 No.4

연구배경: 아세틸 콜린 유발 검사시 발생하는 흉통과 허혈성 심전도 변화가 아세틸 콜린에 의해 발생하는 관상동맥의 내피세포 기능에 어떤 영향을 주는지 알아보고자 했다. 방법: 흉통으로 내원하여 관상동맥 조영술과 아세틸 콜린 유발검사를 시행받은 1,085명의 환자를 대상으로 하였다. 아세틸 콜린 유발 검사를 하는 동안 허혈성 심전도 변화 및 흉통의 발생 유무에 따른 관상동맥 내피세포 기능의 특징을 비교하였다. 결과: 539명의 환자에서 아세틸 콜린 검사시 내피세포 기능 장애가 발생 하였다. 허혈성 심전도 변화가 있었던 그룹이 심전도 변화가 없었던 그룹보다 흉통이 더 많았고(78.1% vs. 60.8%, P=0.007), 관상동맥 조영술상 다발성 관상동맥 경련이 빈번하였고(59.4% vs. 40.6%, P=0.004), 관상동맥의 경련 정도도 더 심하였다(64.1% vs. 46.5%, P=0.006). 흉통이 있었던 그룹이 흉통이 없었던 그룹보다 허혈성 심전도 변화의 빈도가 더 높았다(14.7% vs. 7.5%, P=0.007). 또한 흉통이 있었던 그룹이 관상동맥 경련이 다발성으로 발생하는 경우가 많았고 (50.7% vs. 29.5%, P<0.001), 미만성으로 발생하는 경우가 많았고(87.1% vs. 75%, P<0.001), 관상동맥의 경련의 정도도 더 심하였다(51.6% vs. 43.5%, P=0.041). 결론: 아세틸 콜린 유발검사시 발생하는 허혈성 심전도 변화와 흉통은 관상동맥 경련의 정도와 경련이 발생하는 관상동맥 개수와 연관이 있다. Background: ECG changes and chest pain during acetylcholine (Ach) provocation tests may constitute important clinical parameters for Ach-induced endothelial dysfunction. We investigated the association between ischemic ECG changes and chest pain during the Ach-provocation test and angiographic characteristics of Ach-induced endothelial dysfunction. Methods: A total of 1,085 patients with anginal symptoms underwent diagnostic coronary angiography (CAG) and Ach-provocation tests. We compared angiographic characteristics of Ach-induced endothelial dysfunction according to the presence of ECG change and chest pain. Results: A total of 539 patients experienced Ach-induced endothelial dysfunction. Patients who experienced ECG change group suffered more frequent chest pain (78.1% vs. 60.8%, P=0.007), angiographically more frequent multiple coronary artery spasm (59.4% vs. 40.6%, P=0.004), and more severe coronary artery spasm (64.1% vs. 46.5%, P=0.006) than patients without ECG change. However, there was no difference in the length of endothelial dysfunction between the groups. The incidence of ischemic ECG changes in patients with chest pain was higher than in patients without chest pain (14.7% vs. 7.5%, P=0.007). Patients who experienced chest pain more often experienced multiple (50.7% vs. 29.5%, P<0.001), diffuse (87.1% vs. 75%, P<0.001), and severe coronary artery spasm (51.6% vs. 43.5%, P=0.041) than patients without chest pain. Conclusion: Ischemic ECG changes and chest pain during the Ach-provocation test are associated with multi-vessel involvement and severe coronary artery spasm. Chest pain is associated with the length of endothelial dysfunction, but ischemic ECG change is not.

感染性 疾患의 臨床疫學的 硏究

張友鉉,朴熙明,金漢壽,李承薰 現代醫學社 1969 現代醫學 Vol.10 No.4

The advancement of modern medicine, particularly the application of effective chemotherapeutics and preventive measures, have brought significant changes on the ecological aspect of microbial diseases of man. It was thought worthwhile to study the recent trends and present status of microbial infections in this country. Thus, the relative incidences and their etiological relationships of bacterial species, the pattern of drug sensitivities among the strains, and also the cases diagnosed by the serological methods were studied for the patients of SNU Hospital from January 1963 to December 1967. The results might be summarized as follows; 1. Relationships between bacteria and diseases (1) The species and their relative incidences of bacteria, isolated from various abscess, were α-hemolytic streptococcus 26.6%, Staphyloccus aureus 22.6%, paracolon bacilli 9.9%, coliform bacilli 8.1%, Klebsiella pneumoniae 7.6%, E. coil 6.9%, β-hemolytic streptococcus 5.9%. Staphylococcus albus 3.8%. Proteus 3.8%. Alkaligenes fecalis 2.1%, Diplococcus pneumoniae 1.8% and Pseudomonas aeruginosa 1.6%. (2) The species and their relative incidences of bacteria, isolated from the pyelonephritis cases, were E. coli, 39.5%, coliform bacilli 13.5%, Pseudomonas aeruginosa 9.3%, Proteus 7.4%, Staphylococcus albus 4.6%, α-hemolytic streptococcus 4.6%, Staphylococcus aureus 2.8%, Klebsiella pnemoniae 2.8%, and Alkaligenes fecalis 2.8%. (3) The species and their relative incidences of bacteria, isolated from the osteomyelitis cases, were Staphylococcus aureus 46.5%, β-hemolytic streptococcus 12%, Staphyococcus albus 12%, coliform bacilli 6.9%, α-hemolytic streptococcus 6.9%, paracolon bacilli 5.2% and E. coli 3.5%. (4) The species and their relative incidences of bacteria, isolated from the surgical infections were Staphylococcus aureus 33%, E. coli 15.1%, coliform bacilli 11.6%, Pseudomonas aeruginosa 10.7%, paracolon bacilli 9.8%, Proteus 7.1%, α-hemolytic streptococcus 3.5%, Klebsiella pneumoniae 2.7%, and Alkaligenes fecalis 0.9%. (5) The species and their relative incidences of bacteria, isolated from the pneumonia cases, were Diplococcus pneumoniae 14.4%, Klebsiella pneumoniae 9.6%, Staphylococcus aureus 10.3%, β-hemolytic streptococcus 4.8%, paracolon bacilli 4.8%, E. coli 3.4%, coliform bacilli 3.4%, α-hemolytic streptococcus 34.6% and Staphylococcus albus 13.6%. (6) 44 strains of Salmonella group D were isolated. (7) 207 cases of Salmonella typhosa infections, 39 cases of Salmonella paratyphi A infer ctions and 20 cases of Salmonella paratyphi B infections were diagnosed by Widal. Reactions. (8) No significant change in the yearly pattern between the bacterial species isolated and clinical cases was noticed. 2. Drug-sensitivities of the bacterial strains. (1) Percentage of Staphylococcus aureus strains sensitive to streptomycin, chloramphenicol. Or terramycin appeared to have fluctuated by year. Percentages of the strains sensitive to penicillin, erythromycin albamycin, and kanamycin were 25%, 85%, 99% and 99% respectively, without significant change by year. (2) Perentage of E. coil strain's sensitive to streptomycin, erythromycin, chloramphenicol albamycin and kanamycin were 30%, 9% 70%, and 70% respectively, without significant change by year. Percentage of the strains sensitive to terramjcin decreased from 33.3% in 1963 to 11.6% in 1967 to kanamycin increased from 72% in 1963 to 82% in 1967. None of the strains was sensitive to penicillin. (3) Percentage of proteus strains sensitive to penicillin, terramycin, streptomycin and chloramphenicol were 5%, 3%, 36% and 39%, respectively, without significant change by year. Percentage of the strains sensitive to albamycin decreased from 72.5% in 1963 to 50% in 1967 and to kaiiainycin increased from 72% in 1963 to 82% in 1967. None of the strain was sensitive to erythromycin. (4) Percentage of Pseudomonas strains sensitive to penicillin, streptomycin chloramphenicol, terramycin, erythromycin, albamycin and kanamycin were wider 20% (5) Percentage of coliform bacilli strains sensitive to penicillin, streptomycin, chloramn henicol, terramycin, erythromycin and albamycin were 10%, 24%, 28%, 20% and 10% respectively, without significant change by year. Percentage of the strains sensitive to albamycin appeared to have fluctuated by year. The strains sensitive to kanamycin decreased from 80% in 1963 to 56% in 1967. (6) Pereeentage of paracolon bacilli sensitive to penicillin, streptomycin, chloramphenicol, terrahiycin, erythromycin, kanamycin and albamycin were 3%, 27%, 33%, 20%, 8%, 80% and 65% respectively, without significant change by year.

Systematic Review of Reciprocal Changes after Spinal Reconstruction Surgery : Do Not Miss the Forest for the Trees

Kim, Chang-Wook,Hyun, Seung-Jae,Kim, Ki-Jeong The Korean Neurosurgical Society 2021 Journal of Korean neurosurgical society Vol.64 No.6

The purpose of this review was to synthesize the research on global spinal alignment and reciprocal changes following cervical or thoracolumbar reconstruction surgery. We carried out a search of PubMed, EMBASE, and Cochrane Library for studies through May 2020, and ultimately included 11 articles. The optimal goal of a truly balanced spine is to maintain the head over the femoral heads. When spinal imbalance occurs, the human body reacts through various compensatory mechanisms to maintain the head over the pelvis and to retain a horizontal gaze. Historically, deformity correction has focused on correcting scoliosis and preventing scoliotic curve progression. Following substantial correction of a spinal deformity, reciprocal changes take place in the flexible segments proximal and distal to the area of correction. Restoration of lumbar lordosis following surgery to correct a thoracolumbar deformity induces reciprocal changes in T1 slope, cervical lordosis, pelvic shift, and lower extremity parameters. Patients with cervical kyphosis exhibit different patterns of reciprocal changes depending on whether they have head-balanced or trunk-balanced kyphosis. These reciprocal changes should be considered to in order to prevent secondary spine disorders. We emphasize the importance of evaluating the global spinal alignment to assess postoperative changes.

Rat의 복강내에 투여한 5-fluorouracil-polyglycolic acid 제형이 장기에 미치는 영향에 관한 연구

강대영,송규상,최정목,노승무,정경수,오정연,김진향,양준묵,최선웅,이진호,조준식,민병무,김용백,김창식,박근성,김승영,김학용,인현빈 충남대학교 의과대학 지역사회의학연구소 1998 충남의대잡지 Vol.25 No.1

For more effective intraperitoneal chemotherapy, the authers made 5-fluorouracil-polyglycolic acid composite disks(FU-PGA disks) with 5-fluorouracil and polyglycolic acid, a biodegradable polymer. We inserted the FU-PGA disk into the peritoneal cavites of Sprague-Dawley male rats, the control and three experimental groups; one FU-PGA disk insert group(300mg/kg), two FU-PGA disk insert group(600mg/kg), and three FU-PGA disk insert group(900mg/kg). The control group received a similar number of PGA disk inserts. A pharmacokinetic study was performed to measure the 5-fluorouracil concentration in the peritoneal fluid, blood, and tissues(liver, kidney and heart) at 24 hours, 72hours and 168 hours after insertion of the FU-PGA disk. Light and electron microscopic studies were done. The results were as follows: 1) The number of white blood cells and platelets decreased after FU-PGA insertion. The degree was proportional to the duration and amounts inserted. The change in the number of red blood cells varied slightly. 2) Light microscopically, slight changes were noted at 168 hours in the 3 disk insert group (900mg/kg). Mild fatty change and hepatocyte degeneration around the central veins of the liver were noted, with vacuolar degeneration in the proximal convoluted tubules of the kidney. 3) Electron microscopically,the liver showed focal increases of lipid droplets in the hepatocytes, and irregular nuclear membrane with focal nucleolar segregation of the fibrillar and granular elements. Also the double membranous structure of the hepatocytes and Kupffer cells was widened with bleb formation. The kidney showed wide separation of the nuclear double membrane in the proximal convoluted tubular cells and mesangial cells, with vacuolation and myelin figure formation in the mitochondria of the proximal convoluted tubular cells, at 72 hours and 168 hours in the 2 to 3 FU-PGA insert groups. The heart showed focal loss of cristae,vacuolation and myelin figure formation in the mitochondria of the 2 to 3 FU-PGA insert groups. In conclusion, despite the large amont of FU-PGA inserted, the histopathological changes in the liver, kidney and heart were slight, and consonant with the very low amount of 5-fluorouracil concentrations detected in the liver, kidney and heart. The above results suggest that the FU-PGA composite can serve as a new device for releasing drugs in a controlled manner and easily targeted to intraperitoneal organs. This device can improve the efficacy of intraperitoneal chemotherapy for gastric cancer.

Surgical Causes of Significant Intraoperative Neuromonitoring Signal Changes in Three-Column Spinal Surgery

Wi Seung Myung,Park Sang-Min,Chang Sam Yeol,Lee Jeongik,Kim Sung-Min,장봉순,Kim Hyoungmin 대한척추외과학회 2021 Asian Spine Journal Vol.15 No.6

Study Design: Retrospective case series. Purpose: To evaluate the risks and causes of neurologic complications in three-column spinal surgery by analyzing intraoperative neurophysiological monitoring (IONM) data. Overview of Literature: Three-column spinal surgery, which may be required to correct complex spinal deformities or resection of spinal tumors, is known to carry a high risk of neurologic complications. However, few studies reported a specific surgical procedure related to a significant IONM signal change during surgery. Methods: Multimodality IONM data, including somatosensory-evoked potentials (SSEP) and motor-evoked potentials (MEP), were reviewed in 64 patients who underwent three-column spinal surgery from 2011 to 2015. Surgical procedures included posterior vertebral column resection, pedicle subtraction osteotomy, total en bloc spondylectomy, piecemeal spondylectomy, and corpectomy with laminectomy (n=27) in three cervical, 34 thoracic, and 31 lumbar procedures. Results: Significant IONM signal changes occurred in 11 of 64 (17.1%) patients. SSEP and MEP were changed in 11 patients. Postoperative neurologic deterioration occurred in 54.5% (6 of 11) of the patients, and two of them were permanent. There was no postoperative neurologic deterioration in patients without significant signal change. Suspected causes of IONM data changes are as follows: adhesion/tethering, translation, contusion, and perfusion. Conclusions: Based on the results of this study, to enhance neurologic safety in three-column spinal surgery, surgeons should pay attention to protect the spinal cord from mechanical insult, especially when the spinal column was totally destabilized during surgery, and not to compromise perfusion to the spinal cord in close cooperation with a neurologist and anesthesiologist.

인터넷과 시민운동의 변화

하승창(Seung-Chang Ha) 한국비영리학회 2002 한국비영리연구 Vol.1 No.2

인터넷은 이미 과거 전화가 다가 온 것처럼 아니 그 이상으로 우리 생활의 일부가 되고 있다 인터넷이 일반화된 것은 그리 오래 되지 않으나, 시민운동 진영에게 인터넷이 익숙해진 것은 2000년 총선시민연대 활동을 거치면서 부터이다 1999년의 안티닉스사이트의 경우나 함께하는 시민행동의 경우, 혹은 그 이전의 진보넷처럼 일부 앞선 경험이 있기는 하나 본격적인 흐름이 형성된 것은 2000년부터라 할 것이다 이를 전후로 하여인터넷은 시민운동에게도 변화를 가져오기 시작하였다 시민운동에 있어서 인터넷은 우선 운동방식의 변화를 가져 왔다 새로운 시위양식도 생겨났고, 항의의 방식도 전자적 방식이 사용되었다 홍보에 있어서도 홈페이지의 위력은 과거의 잡지에 비해 훨씬 신속하고 광범한 것이었다 인터넷은 시민운동단체들의 운영방식에도 변화를 가져올 것을 예고하고 있는 데 이미 이메일을 사용한 연락과 회의는 점차 보편화되기 시작하고 있고, 함께 하는 시민행동처럼 온라인으로 총회를 치르는 단체도 나타나기 시작하였다 그러나 여전히 시민단체들 대다수는 인터넷이 주로 검색과 자신의 단체를 홍보하는 수준에 머물러 있으며 인터넷 사용을 일상화하기 위해 필요한 재정이나 훈련된 인력의 부족을 호소하고 있다 이들은 향후 시민단체 상호간의 격차가 정보화를 거치면서 더욱 커질 것으로 예측하고 있다 따라서 시민단체의 균형적 발전을 위해서는 시민단체 상호간의 정보격차를 줄이는 것도 중요한 일이 될 것이다 Internet cannot be separated from our daily life like telephone couldn't in the past. The influence of Internet, if anything, is bigger than that of telephone. It is not a long time since wide use of internet NGOs have been accustomed to internet since 2000 Citizen Solidarity for General Election. Strictly speaking, there was some case in which internet was used as a means of movement by NGOs or was the field of issue of them The cases of web site against Anti-Nics in 1999 and of Citizen's Action Network are examples of the cases The case of Jinbonet, which is prior to those case, is same But it may be said that the year 2000 was the time the use of internet by NGOs has begun in earnest. Since that time, internet has changed the act of NGOs. Above all, internet changed the process of NGO's activities. New method of demonstration appeared, and electronic method of protest was used by them. The effect of Web Page is superior to paper megazine in the point of the promptitude and extension of PR And it is expected that Internet will make the management of NGOs changed. E-mail meeting and communication is already widely used. Moreover, such NGOs as Citizen's Action Network have held a general meeting. But, most NGOs cannot go beyond using internet as a means of searching and PR, yet And they lack funds and human resource which they need in order to expand the range of usingS internet They expect that information and communication technology will reinforce the existing gap among NGOs Therefore, the valanced development among NGOs require to bridge the digital divide among them

RCP 8.5 기후변화 시나리오에 따른 소나무림과 굴참나무림의 산림 탄소 동태 변화 추정 연구

이종열 ( Jong Yeol Lee ),한승현 ( Seung Hyun Han ),김성준 ( Seong Jun Kim ),장한나 ( Han Na Chang ),이명종 ( Myong Jong Yi ),박관수 ( Gwan Soo Park ),김춘식 ( Choon Sig Kim ),손영모 ( Yeong Mo Son ),김래현 ( Rae Hyun Kim ),손요환 한국농림기상학회 2015 한국농림기상학회지 Vol.17 No.1

산림은 많은 양의 탄소를 저장하고 있으며, 산림 탄소 동태는 기후변화에 따라 변화할 것으로 예상된다. 본 연구는 우리나라 산림에서 가장 우점하는 침엽수종과 활엽수종인 소나무림과 참나무림을 대상으로 최근 개발 및 개선된 한국형산림토양탄소모델(Korean ForestSoil Carbon model; KFSC model)을 이용하여 두 가지 기후변화 시나리오(2012년 기온이 2100년까지 유지되는 시나리오(CT), Representative Concentration Pathway(RCP) 8.5 시나리오) 하에서의 산림 탄소 동태를 예측하였다. 5차 국가산림자원조사 자료로부터 소나무림과 굴참나무림 조사구들을 추출한 뒤, 이를 행정구역(9개 도, 7개 특별·광역시) 및 영급(1-5영급, 6영급이상)별로 분류하여 탄소 동태 모의 단위를 설정하였다. 탄소 저장고는 2012년을 기준으로 초기화하였으며, 모의 기간인 2012년부터 2100년까지 모든 교란은 고려하지 않았다. 모의 결과 산림 탄소 저장량은 시간이 경과함에 따라 전반적으로 증가하지만, CT 시나리오에 비하여 RCP 8.5 시나리오 하에서 산림 탄소 저장량이 낮게 나타났다. 소나무림의 탄소 저장량(Tg C)은 2012년에 260.4에서 2100년에는 각각 395.3(CT 시나리오) 및 384.1(RCP 8.5 시나리오)로 증가하였다. 굴 참나무림의 탄소 저장량(Tg C)은 2012년에 124.4에서 2100년에는 219.5(CT 시나리오) 및 204.7(RCP 8.5 시나리오)로 각각 증가하였다. 5차 국가산림자원조사 자료와 비교한 결과, 고사유기물 탄소 저장량의 초기값은 타당한 것으로 나타났다. 모의 기간 동안 소나무림과 굴참나무림의 연간 탄소 흡수율(g C m-2 yr-1)은 CT 시나리오 하에서 각각 71.1과 193.5, RCP8.5 시나리오 하에서 각각 65.8과 164.2로 추정된다. 따라서 우리나라 소나무림과 굴참나무림의 탄소 흡수잠재력은 지구 온난화에 의하여 감소할 것으로 예상된다. 비록 모델의 구조와 파라미터로부터 불확실성이 존재하지만 본 연구는 미래 산림 탄소 동태 파악에 기여할 것으로 기대된다. Forests contain a huge amount of carbon (C) and climate change could affect forest C dynamics. This study was conducted to predict the C dynamics of Pinus densiflora and Quercus variabilis forests, which are the most dominant needleleaf and broadleaf forests in Korea, using the Korean Forest Soil Carbon (KFSC) model under the two climate change scenarios (2012-2100; Constant Temperature (CT) scenario and Representative Concentration Pathway (RCP) 8.5 scenario). To construct simulation unit, the forest land areas for those two species in the 5th National Forest Inventory (NFI) data were sorted by administrative district and stand age class. The C pools were initialized at 2012, and any disturbance was not considered during the simulation period. Although the forest C stocks of two species generally increased over time, the forest C stocks under the RCP 8.5 scenario were less than those stocks under the CT scenario. The C stocks of P. densiflora forests increased from 260.4 Tg C in 2012 to 395.3 (CT scenario) or 384.1 Tg C (RCP 8.5 scenario) in 2100. For Q. variabilis forests, the C stocks increased from 124.4 Tg C in 2012 to 219.5 (CT scenario) or 204.7 (RCP 8.5 scenario) Tg C in 2100. Compared to 5th NFI data, the initial value of C stocks in dead organic matter C pools seemed valid. Accordingly, the annual C sequestration rates of the two species over the simulation period under the RCP 8.5 scenario (65.8 and 164.2 g C m-2 yr-1 for P. densiflora and Q. variabilis) were lower than those values under the CT scenario (71.1 and 193.5 g C m-2 yr-1 for P. densiflora and Q. variabilis). We concluded that the C sequestration potential of P. densiflora and Q. variabilis forests could be decreased by climate change. Although there were uncertainties from parameters and model structure, this study could contribute to elucidating the C dynamics of South Korean forests in future.

인덕터의 DC 바이어스 특성을 고려한 대용량 DC-DC 컨버터의 손실계산

조영창(Young-Chang Jo),최주엽(Ju-Yeop Choi),정승기(Seung-Ki Jung),최익(Ick Choy),송승호(Seung-Ho Song) 대한전기학회 2011 전기학회논문지 Vol.60 No.4

It is necessary to accurately predict converter losses for optimized design of a high-power DC-DC converter. The losses of switching devices and inductor among the elements of the converter take significantly greater proportion. The current ripple will be determined by the size of the inductance and this inductance value varies depending on the DC amount of inductor current. As the inductance changes according to load current, the change influences not only the inductor loss itself but also the total converter loss. In this paper, for more accurate design of a bi-directional DC-DC converter for 30㎾-class energy storage system, more accurate computational model is proposed considering inductance variation according to the load current change. The inductance changes using variable magnetic cores are verified and converter efficiency is tested through simulations and experiments.