• Title/Summary/Keyword: case study reserch

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A Study on the Reinforced Characteristic of Geogrids in Multi-Layered System (다층 시스템에서 지오그리드의 보강특성에 관한 연구)

  • 심재범;신은철;신민호;채영수
    • Proceedings of the Korean Geotechical Society Conference
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    • 2002.03a
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    • pp.533-540
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    • 2002
  • Recently, geogrid reinforcement has been applied tn the subgrade of the roadway and the railway on the compressible layered soil, and the relevant reserch on the reinforcing mechanism has been performed. In this study, mechanics of geogrid reinforcement and the parameters for the improvement of bearing capacity are evaluated and presented based on the case histories of the field load test on the geogrid-reinforced layered subgrade

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Study on the Pervaporation Characteristic of Water-alcohol Mixtures through Aromatic Polyetherimide Membranes : I. Pervaporation through Structure Change of Symmetric Dense and Asymmetric Structure Membranes (방향계 폴리에테르이미드막의 물-알콜 혼합액의 투과증발 특성에 관한 연구 : I.구조 변화에 따른 투과증발)

  • Kim, S.G.;Jegal, J.G.;Lee, K.-H.
    • Applied Chemistry for Engineering
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    • v.8 no.6
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    • pp.945-953
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    • 1997
  • Aromatic polyetherimide membranes were prepared by dry/wet phase inversion method and investigated regarding the pervaporation characteristic of water-alcohol mixtures by using the permselective property of imide group and the structure modification of skin layer of the membrane. The membrane selectivity increased with the reaction time of surface-modification, to some extent, and the density of top layer tends to increases with increasing the reaction time. In the case of dense membrane, the separation factor was 160 and 2000 for 90wt% ethanol mixture and 90wt% isopropanol solution, respectively, which implies that aromatic polyetherimide has a high permselectivity. The temperature dependence of permeation flux seems to follow an Arrhenius type at the temperature range of ($40^{\circ}C-70^{\circ}C$).

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The Case Study of Cut-Slope Stability in Pyroclastic-Rock Area (화산쇄설암 분포지역 내 절토사면 안정성 사례연구)

  • Lee, Jeong-Yeob;Koo, Ho-Bon;Kim, Seung-Hyun
    • Proceedings of the Korean Geotechical Society Conference
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    • 2008.03a
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    • pp.884-893
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    • 2008
  • The purpose of this case study is cut-slope stability in pyroclastic-rock area. Pyroclastic-rock is very vulerable by Chemical and physical weathering. And risk increase of Pyroclastic-rock proportional to exposure time. This case of cut-slope located in Jeollabuk-do Jinan-gun and reserch order is topography character research, geological character research, field survey, measure method presentation.

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A Study about B2C investment consulting service using Robo-Advisor: Case of AndByeond Investment Management (로보 어드바이저를 활용한 B2C 투자자문 서비스 연구: 앤드비욘드 투자자문 사례)

  • Bae, Hanhee;Kim, Youngmin;Oh, Kyong Joo
    • Knowledge Management Research
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    • v.19 no.1
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    • pp.79-95
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    • 2018
  • The purpose of this case study is to analyze the B2C security information service model using the robo-advisor, to develop various service models and to urge new companies to enter. Overseas robo-advisor service market is growing rapidly with the launch of various B2C service models beyond B2B. On the other hand, as the domestic market is dominated by B2B services and serviced just index portfolio which is nascent, it lacks products which are used for active asset management. Recently as the government announced the approval of online investment advisory service, the B2C market of domestic asset management has entered a growth phase, centered on generations familiar with IT. We propose to extend the concept of Robo-Advisor service in accordance with the financial market change. By that model, we will study the case of the algorithm of the investment masters' philosophy and contribute to the expansion of the B2C service market.

The study of thermal change by chemoport in radiofrequency hyperthermia (고주파 온열치료시 케모포트의 열적 변화 연구)

  • Lee, seung hoon;Lee, sun young;Gim, yang soo;Kwak, Keun tak;Yang, myung sik;Cha, seok yong
    • The Journal of Korean Society for Radiation Therapy
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    • v.27 no.2
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    • pp.97-106
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    • 2015
  • Purpose : This study evaluate the thermal changes caused by use of the chemoport for drug administration and blood sampling during radiofrequency hyperthermia. Materials and Methods : 20cm size of the electrode radio frequency hyperthermia (EHY-2000, Oncotherm KFT, Hungary) was used. The materials of the chemoport in our hospital from currently being used therapy are plastics, metal-containing epoxy and titanium that were made of the diameter 20 cm, height 20 cm insertion of the self-made cylindrical Agar phantom to measure the temperature. Thermoscope(TM-100, Oncotherm Kft, Hungary) and Sim4Life (Ver2.0, Zurich, Switzerland) was compared to the actual measured temperature. Each of the electrode measurement position is the central axis and the central axis side 1.5 cm, 0 cm(surface), 0.5 cm, 1.8 cm, 2.8 cm in depth was respectively measured. The measured temperature is $24.5{\sim}25.5^{\circ}C$, humidity is 30% ~ 32%. In five-minute intervals to measure the output power of 100W, 60 min. Results : In the electrode central axis 2.8 cm depth, the maximum temperature of the case with the unused of the chemoport, plastic, epoxy and titanium were respectively $39.51^{\circ}C$, $39.11^{\circ}C$, $38.81^{\circ}C$, $40.64^{\circ}C$, simulated experimental data were $42.20^{\circ}C$, $41.50^{\circ}C$, $40.70^{\circ}C$, $42.50^{\circ}C$. And in the central axis electrode side 1.5 cm depth 2.8 cm, mesured data were $39.37^{\circ}C$, $39.32^{\circ}C$, $39.20^{\circ}C$, $39.46^{\circ}C$, the simulated experimental data were $42.00^{\circ}C$, $41.80^{\circ}C$, $41.20^{\circ}C$, $42.30^{\circ}C$. Conclusion : The thermal variations were caused by radiofrequency electromagnetic field surrounding the chemoport showed lower than in the case of unused in non-conductive plastic material and epoxy material, the titanum chemoport that made of conductor materials showed a slight differences. This is due to the metal contents in the chemoport and the geometry of the chemoport. And because it uses a low radio frequency bandwidth of the used equipment. That is, although use of the chemoport in this study do not significantly affect the surrounding tissue. That is, because the thermal change is insignificant, it is suggested that the hazard of the chemoport used in this study doesn't need to be considered.

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Tendency of Studies on Cancer about TCM and Combining TCM & Western Medicine Treatment in Recent Three Years (종유에 대한 최근 중의 및 중서의 결합치료 연구경향 <2001년 - 2003년 10월까지 발표된 문헌을 중심으로>)

  • Hwang Chung Yeon;Hong Chul Hee
    • Journal of Physiology & Pathology in Korean Medicine
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    • v.18 no.6
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    • pp.1575-1579
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    • 2004
  • According to 2004 health statistics yearbook, cancer ocupies second death reason next to disease of blood circulation system and 1/4 was died because of cancer. There are very many factors to onset cancer, for example the exposure to varius kinds of pollution materials by development of industry, excess intake of harmful food to one's health, spritual stress, as become old age society, increase of attack-rate of geriatric diseases etc, attack-rate of cancer comes to be high gradually. The author had study about to treatment cancer by TCM(traditional chinese medicine) and combining TCM & western medicine, in Guang An Men hospital in Beijing of China from February 2003 to January 2004. TCM papers are 105 and combining TCM & western medicine papers are 280 of total 385 papers. Clinical reserch papers are 166, review articles are 194, animal experimental papers are 25. The papers used development herbal medicine are 42(10.9%), the papers used undevelopment herbal medicineare are 228(59.2%), the papers used senior TCM doctor's therapeutic experience and theory are 17(4.4%), the papers used theory of TCM or theory of combining TCM & western medicine are 71 (18.4%), the papers used acupuncture, qigong, thermotherapy, etc, other methods are 5, the papers used TCM patient's care or dietary treatment are 12 and ststistical papers are 10. Cancer is complicated hard case disease in pathological process. Combining TCM & western medicine treatment system is more efficient than one of TCM or western medicine in diagnosis, treatment, reserch of cancer.

Characteristics of Settlement for Non-woven Geotextile through Cyclic Loading Model Test (원형토조 시험을 통한 반복하중에 따른 부직포의 침하특성)

  • Choi, Chan-Yong;Lee, Jin-Wook;Kim, Hyun-Ki
    • Journal of the Korean Geosynthetics Society
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    • v.8 no.2
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    • pp.47-54
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    • 2009
  • The ballast track, the most common type of conventional railroad track in Korea, is deteriorated by abrasion of ballast, it's penetration into roadbed, and rugged surface of roadbed caused by cyclic loading of train. Persistent occurrence of those phenomena lead to insufficient drain capacity, one of major factors in track design, and it increases pore water pressure and decreases of shear strength under rainfall condition leading to unstable roadbed. In this study, cylindrical model tests are executed for 3 types of geotextile applying cyclic loading in order to observe the characteristics of displacement and bearing capacity of geotextile, and undrained condition has been applied for 0 day, 3 days and 7 days to each geotextiles. The results showed that there was about 1% difference at the final displacement rates between reinforced soils and nature soils and the displacement of the ground surface increases along with the degrees of the saturation. And in case that water contents exceeds the threshold, it is also apparent that weight and tensile strength of geotextile influences displacement of the ground surface. And the larger weight of geotextile is, the smaller plastic displacement. It is evaluated that non-woven fabric comes into effect on reducing the bearing capacity but, the weight of geotextile has little influence on it.

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A Study on the Quality Control for the Circulation Steps including Productipn, Transportation, Selling about Hamburger & Sandwich in Convenience Store (편의점에서 판매되는 햄버거와 샌드위치의 유통과정중 품질관리에 관한 연구)

  • Kim, Heh-Young;Song, Yong-Hye
    • Journal of the Korean Society of Food Culture
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    • v.11 no.4
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    • pp.465-473
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    • 1996
  • The purpose of this study was to evaluate microbiological hazards in the steps of production, transportation and selling of hamburger and sandwich that were marketed in CVS, then to identify methods of control. The reasults are as follows: As the reasult of operation surroundings of manufacturerand reserch of circulation, $4{\sim}6$ hours are needed from manufacturer to CVS. Also transportation car mean temperature was $10^{\circ}C$ which exceeds the standard of $7^{\circ}C$ or below. Hamburger: Critical control points identified were purchasing, cooking, post-preparation, transportation and holding at CVS. As the reasult of microbial analysis following the case of holding methods and reheating at CVS, microbes of cold holding and reheat after cold holding was within standard value. But in the case of room temperature microbes exceeded standard value. Sandwich: Critical control points identified were purchasing, cooking, post-preparation, transportation and holding at CVS. As the reasult of microbial analysis following the case of holding methods and reheating at CVS, total plate counts of cold holding and reheat after cold holding was within standard value. But in the case of room temperature holding after 24 hours total plate counts exceeded standard value. In the case of room temperature holding the number of microbes increased according to the passage of time. As a reasult of food poisoning bacteria, it was negative in every test in sample against V. parahaemolyticus, Salmonella, S. aureus.

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The Case Study of Lactobacillus mixture culture fluid on Atopic dermatitis (아토피피부염에 대한 Lactobacillus 혼합배양액의 임상 증례)

  • Jo, Eul-Hwa;Kim, Tae-Keun;Hong, Su-Jung;Jung, Do-Yean;Hwang, Seng-Yean;Ahn, Seong-Hun
    • The Journal of Korean Medicine
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    • v.36 no.3
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    • pp.135-143
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    • 2015
  • Objectives: Recently lactic acid formulation was known as the adjuvant therapy on atopic dermatitis(AD) symptoms because of little side effects. In this study, it was studied that Lactobacillus mixed culture appliment was effective on not on AD symptoms. Methods: The case-photos 30-40 times of AD symptoms from case were observed with literatures. The case-photos were acquired with environmental AD dermatitis experience program which is conducted in SUNCHANG RESERCH INSTITUTE OF HEALTH AND LONGEVITY from 2014.01 to 2014.08. Experience applicants were limited the oral administration and chemical external administration. Results: Lactobacillus mixed culture appliment was effective because of the mitigation or disappearance of AD primary symptoms like pruritus, erythema, edema, effusion, dry skin, scaly, scab etc. AD symptom degree was dependent on lactobacillus mixed culture appliment times, and classified as Reaction Period (RAP), Reduction Period (RDP), Efection Period (EP), Reproduction Period (RPP) on a single mixed culture appliment time. And AD symptoms which were appeared in RPP were classified as Rebound Period (RBP), Effection Period (EP), Subclinical Period (SCP). Conclusions: Lactobacillus mixed culture appliment is considered to be useful for AD symptoms and is estimated to be effective by different mechanism with oral administration or steroid ointment application. Lactobacillus mixed culture appliment is expected to induce a synergistic effects on AD symptom reliefs with the other oral administration.