山地 果樹園에서 發生하는 矮性사과 나무의 發育不振과 枯死現象 防止對策을 위한 基礎 硏究(Ⅲ)

高光出,柳順昊 서울대학교농과대학농업개발연구소 1989 서울대농학연구지 Vol.14 No.1

This study was carried out to prevent poor growth and die-back in dwarf apple tree cv. 'Fuji' on M26 rootstock planted at reclaimed highland. The obtained results are as follows: 1. For recovery of tree vigour through approach grafting, seedling and MM106 stocks affected more favourably than M9 and M26 stocks, but the effects were negligible. 2. Tree vigour was not recovered by soil improvement but drilling and surface application as an applying method of fertilizer seemed to be favourable for recovery of tree vigour within a short-term period. 3. Completely thinned trees showed better growth than heavy bearing trees and moderately bearing trees, but there were no statistically significant differences. 4. Symptoms of rough bark was more greatly disappeared by approach grafting using M26 and MM 106 stocks, soil improvement and moderate bearing than approach grafting using seedling and M9 stocks, drilling or surface application and complete thinning or heavy bearing, respectively. 5. pH, calcium and magnesium comcentrations of soil were increased by soil improvement, but the contents of other elements were not affected. In addition, available phosphorus concentration of soil was very low as much as 10ppm. 6. The contents of inorganic elements of leaves were slightly affected by approach grafting, degree of fruit bearing, and different soil improving methods. Moreover, total nitrogen, calcium and magnesium contents of leaves were below standard value. 7. Summarizing the results obtained from studies for three years from 1985 to 1987, we would recommend the strategy to prevent poor growth and rough bark which frequently caused in dwarf apple orchard newly estabilished at reclaimed highland as follows: 1) It is more reasonable to use MM106 rootstock than M9 or M26 as dwarf rootstock. 2) 'Fuji' apple cultivar should be replaced by 'Tsugaru' and other cultivars because it showed worse growth and severer symptoms of rough bark. 3) In apple trees which had suffered from damage, the extent of fruit bearing should be reduced. In addition, approach grafting using MM106 stock rather than M9 or M26 should be conducted for recovery of tree vigour. 4) To improve the physical and chemical properties of soil, soil improvement as well as lime and borate application by means of drilling will be requested. 5) In case of dwarf apple trees showed severe symptoms of rough bark, it is possible to recover tree vigour with above described strategy.

유해화학물질의 종합위해등급 알고리즘 개발에 관한 연구

고재선,김광일,정상태 한국화재소방학회 2000 한국화재소방학회논문지 Vol.14 No.4

본 연구에서는 대상물질을 선정한 후 그에 따른 세 가지 기준 즉 독성,화재폭발,환경기준과 각각의 피해예측기법을 설정하고 이 기준들을 알고리즘을 통한 통합한 종합위해등급으로서 선정된 대상물질에 적용하였다. 특히, 환경기준은 포괄적인 개념으로서 USCG 및 MSDS의 환경기준 분류와 NFPA 건강위해 성(Nh) 중 환경관련 부분을 조합하여 환경지수 모델화를 하였다. 또한 각 기준에 따른 피해예측 기법을 선택하여 지역별 임의에 위치한 화학물질 관련업체에 사용 또는 저장 중인 유해화학물질에 대해 적용하여 사용물질에 대한 종합위해등급 설정(단일물질에 대한 가연성, 독성, 반응성, 환경성에 대한 Hazard level 및 표시 모델화) 및 그에 따른 사고시 피해예측 및 강도산정(CPQR직 IAEA, VZ eq), Risk contour를 구할 수 있었다. 이 결과 모든 화학공정 및 저장 등에서 발생할 수 있는 독성 누출,화재폭발의 잠재적 위험성산정을 통한 사전 안전성 평가의 Tool로 활용이 가능하다. In the study, three criteria(toxicity, fire & explosion, environment) and damage prediction method for each case was set up, and all these criteria were applied to the subject substance that was selected as hazardous level by integrating all criteria through Algorithm. Particularly, the environment criterion is a comprehensive concept, environment index modeling by combining USCG(United State Coast Guard) & MSDS(Material Safety Data Sheet) environment criteria classifications and the environment part of NFPA's health hazardousness(Nh). And for damage prediction method of each criterion were adopted and they were applied to hazardous chemical substances in use or stored by chemical substance related enterprises located in each region that made possible to set up total hazard level of used substances(inflammability, poisonousness and counteraction on a unit substance, and hazard level & display modeling on environment) & damage prediction in case of accident & solidity setup(CPQRA : Chemical Process Quantitative Risk Assessment, IAEA : International Atomic Energy Agency; VZ eq : Vulnerable Zone) risk counter. Thus it is deemed that it can be applied to toxic substance leakage that can happen during any chemical processing & storage, application as a tool for prior safety evaluation through potential dangerousness computation of fire & explosio.

기업의 경쟁우위를 위한 환경친화적 경영전략

고광선,양희재 여수대학교 1996 論文集 Vol.10 No.-

Korea is a good example for the developing corporations beacuse of its rapid economic growth, and now is the 21th largest trading country in the world. Hower, the majority of Korea corporations are facing rapid changes of nations and international business environments, especially trade environments and the restriction of the environmental pollution. In this situation, for preparation on the influence of the new protection and sustainable competition advantage, Korea companies have to be prepared for the future. The results of this thesis are as foolows: ① Firms should consider environment to bo the most important factor on competitive advantage in their business. ② The enterprises should establish the company strategies that could be adaptable systematically. ③ In orders to correspond both to the enviromental restriction to betterment quality of life, all parties should do their best by having the high level of environment consciousness.

HDPE 개질 아스팔트 혼합물의 강도 및 변형특성

김광우,이기호,권오선,고태영 강원대학교 부설 석재복합신소재 제품연구센터 2004 석재연 논문집 Vol.9 No.-

본 연구는 폐비닐 펠렛을 도로포장재료로 재활용하여 자원절약 및 아스팔트 혼합물의 품질향상을 위한 연구이다. 이를 위하여 폐비닐의 첨가량별 배합설계를 수행하여 적정 폐비닐 첨가량과 최적 아스팔트 함량으로 편마암과 화강암 2가지 골재와 폐비닐인 RHDPE의 함량을 4가지로 혼합물을 제작하여 8종류의 재질 혼합물과 2종류의 무개질 혼합물을 제작하였다. 그리고 이 공시체에 대하여 마샬안정도, 간접인장강도 및 Kim test와 반복주행시험 등 실내시험을 통하여 혼합물의 특성을 분석하였다. 폐비닐 첨가량은 RHDPE가 8%일 때 안정도와 간접인장강도 모두 가장 우수한 것으로 나타났고 취성도 나타나지 않았다. RHDPE를 첨가한 혼합물에 대하여 Kim test를 수행한 결과 DR과 DS 모두 높은 상관성을 보였다. 그리고 반복주행시험에서는 RHDPE를 첨가한 혼합물이 일반 혼합물보다 우수하였다. 향후 많은 실험을 통해 RHDPE의 우수성을 입증한다면 소성변형 저항성에 우수한 재료로 이용될 수 있을 것이다. This study is a fundamental research for recycled high-density polyethylene (RHDPE) in asphalt mixture for improving roadway pavement. Marshall mix design was conducted and optimum asphalt content(OAC) was determined for dense-graded surface course mixture by RHDPE content. Marshall stability test, indirect tensile strength (ITS) test, wheel tracking trest and Kim-test were carried out to measure the characteristics of RHDPE-added asphalt concretes. From the results of this study, RHDPE in asphalt mixture if possible. It could be considered that adding too much RHDPE in asphalt mixture is not proper. The optimum content of RHDPE was appeared to be 8%. In Kim-test, statistical analysis was performed for each loading head and aggregate to find out correlation between S_(D) values and each rut parameter. The analysis result showed that S_(D) had very high coefficient of determination with rut parameters on the average.

物流輸送 手段의 選擇을 위한 知能的 意思決定支援시스템 Prototype

이준석,고광선 한국정보전략학회 1998 한국정보전략학회지 Vol.1 No.1

In these competitve times, there is great pressure to improve customer service, and at the same time to find cost savings wherever possible. Many manufacturers use the private carrier, or the contracted transportation service, for the purpose of collecting and deilvering shipments for their facilities. Transportation is the largest component of logistics cost. Also, few researches have developed this field and they are fragmentary. The advanced in computer technology has resulted in the greatest impact on business since the industrial revolution. The transportation logistics is no exception to this pheomenon. Especially, Intelligent decision support system(IDSS), integrated expert system(ES) and decision support system(DSS), was significant technology in inventory parts. Therefore, this paper developed prototype IDSS for transportation logistics carrier selection. The focus is on the development of a simple, user-friendly tool that can be used effectively by managers to increase the cost-effectiveness of their transportation logestecs. The IDSS was constructed by using the tools of ART-IM expert system shell, CLIPPER, FORTRAN 77, and SLAMSYS simulation language.

The Analysis of Random Propagating Worms using Network Bandwidth

( Kwang Sun Ko ),( Hyunsu Jang ),( Byuong Woon Park ),( Young Ik Eom ) 한국인터넷정보학회 2010 KSII Transactions on Internet and Information Syst Vol.4 No.2

There is a well-defined propagation model, named the random constant spread (RCS) model, which explains worms that spread their clones with a random scanning strategy. This model uses the number of infected hosts in a domain as a factor in the worms` propagation. However, there are difficulties in explaining the characteristics of new Internet worms because they have several considerable new features: the denial of service by network saturation, the utilization of a faster scanning strategy, a smaller size in the worm`s propagation packet, and to cause maximum damage before human-mediated responses are possible. Therefore, more effective factors are required instead of the number of infected hosts. In this paper, the network bandwidth usage rate is found to be an effective factor that explains the propagations of the new Internet worms with the random scanning strategy. The analysis and simulation results are presented using this factor. The simulation results show that the scan rate is more sensitive than the propagation packet for detecting worms` propagations.

Digital Health Technology Use Among Older Adults: Exploring the Impact of Frailty on Utilization, Purpose, and Satisfaction in Korea

Lee Hyejin,Choi Jung-Yeon,Kim Sun-wook,Ko Kwang-Pil,Park Yang Sun,Kim Kwang Joon,Shin Jaeyong,Kim Chang Oh,Ko Myung Jin,Kang Seong-Ji,Kim Kwang-il 대한의학회 2024 Journal of Korean medical science Vol.39 No.1

Background: The importance of digital technology is increasing among older adults. In this study, the digital health technology utilization status, purpose, and satisfaction of older adults were investigated according to frailty. Methods: A face-to-face survey was conducted among adults aged 65 years or older. Frailty was defined using the Korean version of the fatigue, resistance, ambulation, illnesses, and loss of weight scale. Results: A total of 505 participants completed the survey, with 153 (30.3%) identified as pre-frail or frail and 352 (69.7%) as healthy. All respondents used smartphones; 440 (87.1%) were application users, and 290 (57.4%) were healthcare application users. Wearable devices were used by only 36 patients (7.1%). Pre-frail or frail respondents used social media more frequently than healthy respondents (19.4% vs. 7.4%, P < 0.001). Among the respondents, 319 (63.2%) were not able to install or delete the application themselves, and 277 (54.9%) stated that the application was recommended by their children (or partner). Pre-frail and frail respondents used more healthcare applications to obtain health information (P = 0.002) and were less satisfied with wearable devices (P = 0.02). Conclusion: The usage rate of digital devices, including mobile phones among older adults in Korea is high, whereas that of wearable devices is low. There was a notable difference in the services used by pre-frail and frail respondents compared to healthy respondents. Therefore, when developing digital devices for pre-frail and frail older adults, it is crucial to incorporate customized services that meet their unique needs, particularly those services that they frequently use.

Feasibility and response of helical tomotherapy in patients with metastatic colorectal cancer

Sun Hyun Bae,Seong Kwon Moon,Yong Ho Kim,Kwang Hwan Cho,Eung Jin Shin,Moon Sung Lee,Chang Beom Ryu,Bong Min Ko,Jina Yun 대한방사선종양학회 2015 Radiation Oncology Journal Vol.33 No.4

Purpose: To investigate the treatment outcome and the toxicity of helical tomotherapy (HT) in patients with metastatic colorectal cancer (mCRC). Materials and Methods: We retrospectively reviewed 18 patients with 31 lesions from mCRC treated with HT between 2009 and 2013. The liver (9 lesions) and lymph nodes (9 lesions) were the most frequent sites. The planning target volume (PTV) ranged from 12 to 1,110 mL (median, 114 mL). The total doses ranged from 30 to 70 Gy in 10–30 fractions. When the α/β value for the tumor was assumed to be 10 Gy for the biologically equivalent dose (BED), the total doses ranged from 39 to 119 Gy10 (median, 55 Gy10). Nineteen lesions were treated with concurrent chemotherapy (CCRT). Results: With a median follow-up time of 16 months, the median overall survival for 18 patients was 33 months. Eight lesions (26%) achieved complete response. The 1- and 3-year local progression free survival (LPFS) rates for 31 lesions were 45% and 34%, respectively. On univariate analysis, significant parameters influencing LPFS rates were chemotherapy response before HT, aim of HT, CCRT, PTV, BED, and adjuvant chemotherapy. On multivariate analysis, PTV ≤113 mL and BED >48 Gy10 were associated with a statistically significant improvement in LFPS. During HT, four patients experienced grade 3 hematologic toxicities, each of whom had also received CCRT. Conclusion: The current study demonstrates the efficacy and tolerability of HT for mCRC. To define optimal RT dose according to tumor size of mCRC, further study should be needed

韓國에 있어서 痢疾菌屬의 蔓延狀泰에 關한 調査硏究

高光均,李淵台,崔尙圭,李鐘訓,黃基銑,丁海植,朴聖熙,朴吉壽,奇龍肅 대한감염학회 1971 감염 Vol.3 No.1

A bacteriological survey was carried out in an effort to approximate the present status of the distribution of Shigella species in Korea. The specimens for the survey were obtained by direct rectal swabs both from healthy and diarrheal persons including specimens from food stuffs and natural environments, which were chosen arbitrarily in thirteen areas of Korea during 1969 to 1971. Total number of 11,787 specimens were collected from various sources: 9,128 rectal swabs from healthy persons and 1,630 rectal swabs from diarrheal patients, and 1,029 specimens from various food stuffs, sewages and other natural environments. 1. During these three years from 1969 to 1971, 186 Shigella strains of different serotypes were identified from various specimens: 94 strains out of 9,128 rectal swabs from healthy persons, 62 strains from 1,630 diarrheal cases, 14 strains out of 167 specimens taken from food stuffs including fishes, shellfishes and their products, and 16 strains out of 167 sewage specimens. In the year of 1969, 16 strains of Shigella were isolated from rectal swabs: 4 strains out of 47 specimens from healthy persons and 12 strains from 169 diarrheal cases. In the year of 1970, 101 strains of Shigella were isolated from various specimens: 23 strains out of 751 rectal swabs from healthy persons, 49 strains from 1,347 diarrheal cases, 14 strains out of 136 specimens taken from food stuffs including fishes, shellfishes and their products, and 15 strains out of 94 sewage specimens. In the years of 1971, 69 strains of Shigella were isolated from various sources: 67 strains out of 8,330 rectal swabs from healthy persons, 1 strans from 114 diarrheal cases, and 1 strains out of 73 sewage specimens. A striking evidence for the evironmental contamination with Shigella was found in such particular cities such, as Kangnung, Chumunjin and Incheon in 1970, suggesting further survey has to be done. 2. In this survey it was found that the distribution of Shigella serotypes were different from that of hospital sources. Sh. dysenteriae and Sh. boydii were equally prevalent, 0.45% and 0.35% respectively, among apparently healthy persons, as this survey indicates but Sh. sonnei were far less prevalent in compare with other serotypes among apparently healthy persons. 3. Aunal frequency of Sh. dysenteriae and Sh. boydii was fluctuated with a peak on the year of 1970, still being predominant comparatively. Sh. flexneri and Sh. sonnei were found to be decreased from 4.17% to 0.05% and 1.85% to 0.08%, with milder symptomes, respectively. A considerable number of Alkalescens-Dispar group was still found in 0.16% from healthy persons.

The difference in mRNA expressions of hypothalamic CCK and CCK-A and -B receptors between responder and non-responder rats to high frequency electroacupuncture analgesia

Ko, Eun-Sang,Kim, Sun Kwang,Kim, Jung-Taek,Lee, Giseog,Han, Jae-Bok,Rho, Sam-Woong,Hong, Moo-Chang,Bae, Hyunsu,Min, Byung-Il 경희대학교 동서의학연구소 2006 東西醫學硏究所 論文集 Vol.2006 No.-

The present study was performed to determine whether the expression levels of the hypothalamic cholecystokinin (CCK) and its receptors are associated with the responsiveness to high frequency electroacupuncture (EA) analgesia in rats. EA stimulation (100 Hz, 0.5 mspulse width, 0.2-0.3 mA) was delivered to the Zusanli (ST36) acupoint of male Sprague-Dawley rats for 20 min without anesthetics or holder restraint. The analgesic effect of EA was quantified using a tail flick latency test, and subsequently animals were allocated to responder or non-responder groups. The hypothalamus of rats in each group was dissected and RNA was purified. The mRNA expressions of CCK, and CCK-A and -B receptor were determined by real-time RT-PCR. CCK mRNA levels were not significantly different in the two groups, whereas both CCK-A and -B receptors were significantly more expressed in non-responders. These results suggest that the level of CCK receptor mRNA expression in the hypothalamus, rather than CCK mRNA, has an important relationship with the individual variations to high frequency EA analgesia in rats.