• 제목/요약/키워드: 4M method

검색결과 11,319건 처리시간 0.05초

Study on the procedure to obtain an attainable speed in pack ice

  • Kim, Hyun Soo;Jeong, Seong-Yeob;Woo, Sun-Hong;Han, Donghwa
    • International Journal of Naval Architecture and Ocean Engineering
    • /
    • 제10권4호
    • /
    • pp.491-498
    • /
    • 2018
  • The cost evaluation for voyage route planning in an ice-covered sea is one of the major topics among ship owners. Information of the ice properties, such as ice type, concentration of ice, ice thickness, strength of ice, and speed-power relation under ice conditions are important for determining the optimal route in ice and low operational cost perspective. To determine achievable speed at any designated pack ice condition, a model test of resistance, self-propulsion, and overload test in ice and ice-free water were carried out in a KRISO ice tank and towing tank. The available net thrust for ice and an estimation of the ice resistance under any pack ice condition were also performed by I-RES. The in-house code called 'I-RES', which is an ice resistance estimation tool that applies an empirical formula, was modified for the pack ice module in this study. Careful observations of underwater videos of the ice model test made it possible to understand the physical phenomena of underneath of the hull bottom surface and determine the coverage of buoyancy. The clearing resistance of ice can be calculated by subtracting the buoyance and open water resistance form the pre-sawn ice resistance. The model test results in pack ice were compared with the calculation results to obtain a correlation factor among the pack ice resistance, ice concentration, and ship speed. The resulting correlation factors were applied to the calculation results to determine the pack ice resistance under any pack ice condition. The pack ice resistance under the arbitrary pack ice condition could be estimated because software I-RES could control all the ice properties. The available net thrust in ice, which is the over thrust that overcomes the pack ice resistance, will change the speed of a ship according to the bollard pull test results and thruster characteristics (engine & propulsion combination). The attainable speed at a certain ice concentration of pack ice was determined using the interpolation method. This paper reports a procedure to determine the attainable speed in pack ice and the sample calculation using the Araon vessel was performed to confirm the entire process. A more detailed description of the determination of the attainable speed is described. The attainable speed in 1.0 m, 90% pack ice and 540 kPa strength was 13.3 knots.

외국인이 인식하는 한의학 의료관광의 가능성 및 사상체질진단 경제적 가치평가 (Potential Ability of Traditional Korean Medical Tourism and Economic Valuation of Sasang Constitutional Typology Diagnosis from Foreigner's Perspective)

  • 김형순;이희승;차병헌;주종천
    • 사상체질의학회지
    • /
    • 제23권1호
    • /
    • pp.115-124
    • /
    • 2011
  • 1. Objectives : This study aimed to provide practical insights on the development of traditional Korean medical tourism and maximize the satisfaction of foreign patients. The main objectives of this study were also to evaluate Sasang Constitutional Medicine(S.C.M.) diagnosis cost from foreigners' perspectives. 2. Methods : For this study, the data were collected from tourists to Korea between January 3, 2010 to February 20, 2010. The sample used in this study was mainly composed of Japanese, Chines and US/Canada, because they are the major national visitor origin group to Korea. The primary data were collected by questionnaire survey using a standardized instrument with a convenience sampling procedure, and efforts of the interviews involved an on-site, self-administrated questionnaire to those sitting or visiting tourist attractions. The total size of the sample was 276 of which 275 showed no missing value against the factors needed for final analysis and were for analysis as an effective sample. SPSS 13.0 for window was used to analyze the collected data on which descriptive statistics and the Limited Dependent(LIMDEP) 8.0 program was used in estimating the willingness-to-pay(WTP) for traditional Korean medical tourism through the Contingent Valuation Method(CVM). A dichotomous choice question form of a CVM was applied to estimating the value. 3. Results and Conclusion: 1. There was significant statistical relationship between attributes when considering medical tourism destination and socio-demographic profiles such as age group, nationality, educational level and occupation. 2. In the level of recognition on Korean medicine, north Americans showed low level of recognition compared to other nationalities. In addition, in terms of age group, 20's and 30's showed low level of recognition on Korean medicine, 3. In relation to the level of interest on Korean medicine, Japanese respondents had higher interesting level on Korean medicine. Also singles had higher level of interest. 4. Regarding preferred Korean medical treatment program, there found significant statistical relationship between Korean medical treatment program and socio-demographic characteristics. 5. The estimating result of the logit model showed that the variables affecting the WTP for Sasang Constitutional medicine diagnosis were offered price and potential ability of medical tourism destination. 6. In relation to WTP for Sasang Constitutional medicine diagnosis, Japanese respondents showed a WTP of USD 62.69 and Chinese respondents showed USD 57.09. On the other hands, respondents from north America and other countries showed a WTP of USD 65.50. In conclusion, from this study, the results found that the opportunities in tradition Korean medical tourism are immense and the possible rewards are numerous. It is time to continue to promote 'Sasang Constitutional medicine' and make the Korean medical tourism programs considering on nationalities, age group, gender and WTP.

신갈나무림의 군집별 토양특성 (Soil Properties in Quercus mongolica Communities)

  • 박관수;장규관
    • 한국환경생태학회지
    • /
    • 제12권3호
    • /
    • pp.236-241
    • /
    • 1998
  • 본 연구는 한반도 냉온대 낙엽수림을 특징짓는 신갈나무림에 대한 군집별 토양특성의 차이를 조사하기 위해 실시되었다. 본 연구에서 식생조사 및 토양조사는 1991년 4월부터 1994년 10월까지 오대산과 중왕산 전역에서 신갈나무가 우점하는 임분을 대상으로 실시하였다. 조사지역내의 신갈나무 우점림을 Braun-Blanquet 법으로 분석한 결과, 조사지역은 신갈나무-분비나무, 신갈나무-당단풍, 신갈나무-생강나무, 신갈나무-복장나무, 그리고 신갈나무-까치박달나무의 5개 군집으로 구분되었다. 신갈나무-분비나무군집은 A층의 토심이 약 5cm로서 다른 군집에 비해서 가장 얕게 발달되어 있었으며 식물뿌리는 주로 토심 l0cm까지 발달되어 있었고 건조한 토양수분 상태를 유지하고 있었다. 신갈나무-당단풍군집과 신갈나무-생강나무군집은 매우 유사한 토양의 형태학적인 특성을 가지고 있었으며 A층의 토심이 약 20cm였다. 식물뿌리는 주로 토심 20cm까지 발달되어 있고 약간 건조한 토양수분 상태를 유지하고 있었다. 신갈나무-복장나무군집과 신갈나무-까치박달나무군집의 두 군집 또한 유사한 토양특성을 보여주었는데 A층의 토심은 약 35cm로서 다른 군집에 비해 가장 깊은 A층을 유지하고 있었다. 식물뿌리는 주로 토심 40cm이상까지 발달되어 있었고 비교적 습윤한 토양수분 상태를 유지하고 있었다. 신갈나무-복장나무군집 그리고 신갈나무-까치박달나무군집은 0~100m 그리고 10~20cm의 토양깊이에서 가장 많은 유기물. 전질소, 치환성 Ca. Mg. 그리고 K 함량과 CEC를 가지고 있었으며, 신갈나무-분비나무군집에서 가장 적은 유기물, 전질소, 그리고 CEC를 가지고 있었다. 본 연구 결과 신갈나무림의 군집별 토양특성은 큰 차이가 있는 것으로 나타났으며, 이러한 결과는 존재하는 식생들에 의한 차이보다는 우선적으로 군집간 주요 분포지의 입지조건이 다르기 때문으로 사료된다.

  • PDF

남한 습곡대 중앙부의 중생대 화강암 질암의 생선년대와 냉각사 (Geochronology and Cooling history of the Mesozoic Granite Plutons in the Central Part of the Ogcheon Fold Belt, South Korea)

  • Myung-Shik JIN
    • 암석학회지
    • /
    • 제4권2호
    • /
    • pp.153-167
    • /
    • 1995
  • 옥천습곡대 중앙부에 분포하는 중생대 화강암체의 전암 및 광물연령을 Rb-Sr, K-Ar, 휫션트랙법으로 측정하여, 그들 암체의 관입 정치시기와 지체구조 발달과정인 지열사를 규명하였다. 이들 중생대 화강암체중 Rb-Sr법으로 동시선 연령을 구한 쥬라기의 제천화강암체(~203 Ma)와 문경화강함체(~200 Ma), 그리고 백악기 중기의 무암사화강암체(~110 Ma), 월악산 및 대야산화강암체(~110 Ma)는 모드 스트론치움 초생값($Y^{87}Sr/^{88}Sr)_i$이 0.7100 이상의 값을 나타내여, "I-형"과 "S-형"에 속하여, 지각물질이 혼화된 "M-형"의 마그마로부터 결정분화한 것으로 밝혀졌다. 또 위의 쥬라기 화강암체는 암상 및 조암광물의 지화학적 연구결과 심부에 정치되어 약 $300^{\circ}C$가지는 급히 낵강하였으나, 그 이후부터는 서서히 냉각한 것으로 생각되나, 문경화강암체는 ~110 Ma경에 천부에 관입한 백악기 중기의 월악산, 대야산 화강암체의 높고 큰 열로 동위원소계가 완전히 또는 부분적인 재평을 이루므로써, 각 연령측 안방법중 연령보존온도 이하의 연령측안시료에서는 실제 제시해야 할 연령보다도 더 젊은, 후기의 지질변동 시기(~110 Ma)를 제시하거나, 부분적인 연령감소를 나타내는 감소된 연령(K-Ar 감섬석 연령: 142 Ma)을 나타내고 있다. 또 백악기 중기(~110 Ma)의 무암사, 월악산, 대야산화강암체와 백악기 중기-말기(~90 Ma)의 속리산 및 형제봉화강암체는 천처에 관입하여 매우 단순하게 그리고 급속히 냉각한 암체인 것으로 확인되었다.

  • PDF

Management of Sexual Maturation and Natural Spawning of Captive-Reared Yellowtail Kingfish, Seriola lalandi, in an Indoor Rearing Tank

  • Yang, Sang Geun;Ji, Seung Cheol;Lim, Sang Gu;Hur, Sang Woo;Jeong, Minhwan;Lee, Chi Hoon;Kim, Bong Seok;Lee, Young-Don
    • 한국발생생물학회지:발생과생식
    • /
    • 제20권2호
    • /
    • pp.119-125
    • /
    • 2016
  • This study describes results on sexual maturation and characteristics of natural spawned eggs to develop a method for the production of stable, healthy fertilized eggs from captive-reared yellowtail kingfish, Seriola lalandi. A total of 59 yellowtail kingfish were captured off the coast of Jeju Island, after which the broodstock was cultured in indoor culture tank ($100m^3$) until they were 6.1-14.9 kg in body weight. As part of the rearing management for induced sex maturation, the intensity of illumination was maintained at 130 lux. The photoperiod (light/dark; L/D) was set to a 12 L/12 D from October 2013 to January 2014, and 15 L/9 D from February 2014 to June 2014. Feeds comprised mainly EP (Extruded Pellets), with squid cuttlefish added for improvement of egg quality, and was given from April to June 2014. The first spawning of yellowtail kingfish occurred in May 3, 2014, at a water temperature of $17.0^{\circ}C$. Spawning continued until June 12, 2014, with the water temperature set at $20.5^{\circ}C$. Time of spawning was 26 times at this period. The total number of eggs that spawned during the spawning period was $4,449{\times}10^3$. The buoyant rate of spawning eggs and fertilization rate of buoyant eggs during the spawned period were 76.1% and 100%, respectively. The diameters of the egg and oil globule were $1.388{\pm}0.041mm$ and $0.378{\pm}0.029mm$, respectively, which was higher in early eggs than in those from late during the spawned period.

Growth and yield responses of rice varieties to various soil water deficit conditions under different soil types

  • Kikuta, Mayumi;Samejima, Hiroaki;Magoti, Rahab;Kimani, John M.;Yamauchi, Akira;Makihara, Daigo
    • 한국작물학회:학술대회논문집
    • /
    • 한국작물학회 2017년도 9th Asian Crop Science Association conference
    • /
    • pp.322-322
    • /
    • 2017
  • To avoid drought stress under rainfed upland conditions, it is important for rice to efficiently utilize water at shallow soil layers supplied by rainfall, and access to water retained in deer soil layers. The root developmental characteristics of rice, which play important role in the adaptability to drought conditions, vary depending on the variety. Moreover, water availability for plant differs depending on the soil types that have different physical properties such as water holding capacity, permeability, capillary force, penetration resistance, etc. In this study, we evaluated growth and yield responses of rice varieties to various soil water deficit conditions under three different soil types. The experiment was conducted in a plastic greenhouse at the Kenya Agricultural and Livestock Research Organization-Mwea from October 2016 to January 2017. Two upland varieties (NERICA 1 and 4) and one lowland variety (Komboka) were grown in handmade PVC pots (15.2 cm diameter and 85.0 cm height) filled with three different types of soil collected from major rice-growing areas of the country, namely black cotton (BC), red clay (RC), and sandy clay (SC). Three watering methods, 1) supplying water only from the soil surface (W1), 2) supplying water only from the bottom of the pots (W2), and 3) supplying water both from the soil surface and the bottom of pots (W3), were imposed from 40 days after sowing to maturity. Soil water content (SWC) at 20, 40, and 60 cm depths was measured regularly. At the harvesting stage, aboveground and root samples were collected to determine total dry weight (TDW), grain yield, and root length at 0-20, 20-40, 40-60, and 60-80 cm soil layers. Irrespective of the watering methods, the greatest root development was obtained in RC, while that in BC was less than other two soils. In BC, the degree of yield reduction under W1 was less than that in RC and SC, which could be attributed to the higher water holding capacity of BC. In RC, the growth and yield reduction observed in all varieties under W1 was attributed to the severe drought stress. On the other hand, under W2, SWC at the shallow soil depth in RC was maintained because of its higher capillary force compared with BC and SC. As the result, growths and yields in RC were not suppressed under W2. In SC, deep root development was not promoted by W2 irrespective of the varieties, which resulted in significant yield losses. Under W1, the rice growth and yield in SC was decreased although shallow root development was enhanced, and the stomatal conductance was maintained higher than RC. It was suspected that W1 caused nutrients leaching in SC because of its higher permeability. Under rainfed conditions, growth and yield of rice can be strongly affected by soil types because dynamics of soil water conditions change according to soil physical properties.

  • PDF

억간산(抑肝散)의 항간질성(抗癎疾性) 효과(效果)에 대한 실험적(實驗的) 연구(硏究) (An Experimental Study on the Antiepileptic Effects of Ukgansan)

  • 김경석;성강경;문병순
    • 대한한방내과학회지
    • /
    • 제19권1호
    • /
    • pp.57-72
    • /
    • 1998
  • This study has been carried out to investigate the effects of Ukgansan(UGS) extract on anti-convulsive, antipyretic, analgesic, sedative and GABAergic system of experimental animals. The results of this study were as follows : 1. UGS extract prolonged significantly the beginning time to convulsion and death induced by strychnine. 2. UGS extract prolonged significantly the time to death induced by electrical shock of ECT unit.(3 sec, 200 F, 25 mA) 3. On the experiment of hypothermic effects of UGS extract on the rectal temperature of mouse, UGS extract decreased significantly the rectal temperature of mouse 4. On the experiment of antipyretic effects of UGS extract on the febrile induced by the subcutaneous injection of $150\;{\mu}g/kg$ endotoxin in mouse, UGS extract decreased significantly the rectal temperature of mouse. 5. On the experiment of analgesic effects of UGS extract on the writhing syndrome induced by intraperitoneal injection 0.7% acetic acid 1 ml/100g in mouse, the writhing syndrome induced by acetic acid was reduced significantly by administration of UGS extract. 6. On the experiment of effects of UGS extract on spontaneous motor activity measured by wheel cage method in mice, the spontaneous motor activity was reduced significantly by administration of UGS extract. 7. On the experiment of effects of UGS extract on the activity of GABA-transaminase(GABA-T) in mouse brains after 21 days of oral administration of UGS extract. the activity of GABA-T was reduced significantly by administration of UGS extract. 8. On the experiment of effects of UGS extract on the activity concentration of GABA in mouse brain after 21 days of oral administration of UGS extract, the activity concentration of GABA was reduced significantly by administration of UGS extract. 9 On the experiment of effect of UGS water extract on the activity of GAD in mouse brain after 21 days of oral administration of UGS extract, the activity of GAD was reduced significantly by administration of UGS extract. According to the these results, Ukgansan extracts reveal the effects on the anti-convulsive, antipyretic, analgesic, sedative and GABAergic system.

  • PDF

Glutamate에 의한 세포내 칼슘농도변화와 세포독성과의 관계 (Intracellular Calcium Concentration in the Glutamate-induced Cytotoxicity in PCl2 Cell)

  • 황인영;신임철;송연숙;성민제;박혜지;이윷모;박철범;이명구;오기완
    • Toxicological Research
    • /
    • 제18권4호
    • /
    • pp.355-362
    • /
    • 2002
  • Pathophysiological elevation of intracellular calcium concentration ($[Ca^{2+}]_1$) in the neuron has been considered as an important responsible factor in the neuronal cell damages. However the mechanism of increase of $[Ca^{2+}]_1$ and the relationship between $[Ca^{2+}]_1$ level and cytotocixity have not been fully demonstrated. In the present study, real-time alteration of $[Ca^{2+}]_1$and cellular response (cell damages) in the pheochromocytoma cells (PC12) stimulated by glutamate were investigated. Glutamate dose dependently decreased cell viability determined propidium iodide fluorescence method and morphology change. Conversely related with cell damages, glutamate dose dependently increased the level of[Ca$^{2+}$$_{i}$ . To investigate the mechanism of glutamate-induced increase of $[Ca^{2+}]_1$,$[Ca^{2+}]_1$, was first measured in the cell cultured in calcium free media and in the presence of dantrolene, an inhibitor of calcium release from ryanodine receptor located in endoplasmic reticulum (ER). Similar to the increase$[Ca^{2+}]_1$ in the calcium-containing media, glutamate dose dependently increased $[Ca^{2+}]_1$ in the cell cultured in free calcium media. However pretreatment (2 hr) with 20~50 $\mu\textrm{M}$ dantrolene substantial lowered glutamate-induced increase of $[Ca^{2+}]_1$, suggesting that release of calcium from ER may be major sourse of increase of $[Ca^{2+}]_1$ in PC12 cells. Dantrolene-induced inhibition of $[Ca^{2+}]_1$ resulted in recovery of cytotoxicity by glutamate. Relevance of N-methy-D-aspartate (NMDA) receptor, a type of glutamte receptor on glutamate-induced incense of $[Ca^{2+}]_1$,$[Ca^{2+}]_1$ was also determined in the cells pretreated (2 hr) with NMDA receptor antagonist MK-80l. Glutamate-induced increase of $[Ca^{2+}]_1$ was reduced by MK-801 dose dependently. Furthermore, glutamate-induced cytotoxicity was also prevented by MK-80l. These results demonstrate that glutamte increase $[Ca^{2+}]_1$ dose dependently and thereby cause cytotoxicity. The increase of $[Ca^{2+}]_1$ may release from ER, especially through ryanodine receptor and/or through NMDA receptor Alteration of calcium homeostasis through disturbance of ER system and/or calcium influx through NMDA receptor could contribute glutamate-induced cell damages.s.

Monoclonal antibodies to recombinant Der p2, a major house dust mite allergen: specificity, epitope analysis and development of two-site capture ELISA

  • Yong, Tai-Soon;Lee, Sang-Mi;Park, Gab-Man;Lee, In-Yong;Ree, Han-Il;Kim, Kyung-Sup;Oh, Sang-Hwan;Park, Jung-Won;Hong, Chein-Soo
    • Parasites, Hosts and Diseases
    • /
    • 제37권3호
    • /
    • pp.163-169
    • /
    • 1999
  • House dust mite allergens have been well established as sensitizing agents that are important in the induction of allergic diseases. In order to analyze epitopes of the allergen and to develop a quantitative method of the allergen exposure, monoclonal antibodies against a recombinant Der p 2 (rDer p 2), one of the major allergens of Dermatophogoides pteronyssinus, were produce. Four monoclonal antibodies produced wee species-specific and did not cross-react to the D. farinae crude extract. Two of the monoclonal antibodies were found to be IgG1 and the others were IgM. For the analysis of epitopes, a Der p 2 cDNA encoding 126 amino acids (aa) was dissected into three fragments with several overlapping peptides, A (aa residues 1-49), B (44-93), and C fragment (84-126). Three monoclonal antibodies showed reactivities to the recombinant B fragment and to the full-length rDer p 2, but one monoclonal antibody reacted only with the full-length rDer p 2. Two-site capture ELISA was developed using two different monoclonal antibodies for quantitating Der p2 in house dust. The sensitivity limit was 4ng/ml with rDer p2 and $8{\;}\mu\textrm{g}/ml$ with the d. pteronyssinus crude extract. The result suggested that the assay using monoclonal antibodies against rDer p2 could be useful for the environmental studies and for the standardization of mite allergen extracts.

  • PDF

BTEX 분해미생물의 순수분리와 혼합 배양에 따른 기질 분해율 및 미생물 성장률 변화에 관한 연구 (A Study on Isolation of BTEX Degrading Microorganism and Variation of BTEX Removal Efficiency and Microorganism Growth Rate According to Co-Culture)

  • 정경미;이상협;이한웅;홍석원;김영오;최용수;유명진
    • 한국물환경학회지
    • /
    • 제21권4호
    • /
    • pp.347-352
    • /
    • 2005
  • The isolated microorganisms, Pseudomonas stutzeri, Raoultella planticola (Klebsiella), Serratia fonticola from petroleum contaminated soil were enriched on benzene, toluene, ethylbenzene, o-xylene as carbon and energy sources, respectively. And the degradation characteristics of BTEX was observed in the mixed BTEX substrates. We found that the BTEX in mixed substrates were degraded more than 50% by three isolated microorganisms. Among three isolated microorganisms, the highest degradation rate was observed in Pseudomonas stutzeri, but the degradation rate was different according to microorganisms. In order to increase the degradation efficiency, we applied the co-culture of isolated three microorganisms. The mixture rate of pseudomonas stutzeri : Raoultella planticola (Klebsiella) : Serratia fonticola was follows ; 1:2:1, 1:1:2, and 2:1:1, respectively. In two co-culture of 1:2:1 and 1:1:2, degradation rate was lower than isolated microorganisms. However, degradation rate became higher than isolated microorganisms and the degradation rate of benzene, toluene, and ethylene was more than 95% in co-culture of 2:1:1. The degradation rate increased through the co-culture of isolated microorganisms, however, the growth rate decreased. This was resulted from the substrate competition between microorganisms. The co-culture of microorganisms is a effective method to increase the degradation efficiency of BTEX and the co-culture mixing rate is a important factor for determination of degradation efficiency.