• Proceedings of the Korea Concrete Institute Conference
• /
• 2000.04a
• /
• pp.805-810
• /
• 2000

The purpose of this study is to predict long-term structural safety on the Yonggwang Unit 3 prestressed concrete containment building. The aging-related degradations of its main structural materials are investigated and the effects of the property variation of time-dependent materials on the structural behavior of containment building are also assessed through the analysis on the ultimate pressure capacity. The nonlinear finite element analyses for both the design criteria condition a the present aging condition are conducted to assess the present structural capacity of the containment building As a result, it is verified that the structural capacity of the Yonggwang Unit 3 containment building under the present aging condition is judged to be still rugged. n addition, the sensitivity of the ultimate pressrue capacity of containment building according to th degradation levels of the structural materials are assessed. Finally, it is showed that the sensitivity levels are in the order of the tendon, rebar and concrete in case of individual material degradations, and the tendon-rebar, tendon-concrete and rebar-concrete in case of coupled material degradations.

• Journal of the Korean Society of Safety
• /
• v.11 no.4
• /
• pp.16-23
• /
• 1996

In controlling manipulators interacting with the external environment, an important role is played by the Force/Torque(F/T) sensors. Recently, a number of structures for F/T sensors have been proposed, and some criteria for their evaluation have been introduced. This paper presents a systematic analysis of F/T sensor at the design stage. A model of the F/T sensors, based on Stewart Platform structure, is developed on the basis of static and kinematic equation. The condition number defined by the kinematic velocity and force analysis of F/T sensor is used as a performance Index. Thus, 4 optimal structure factors of 6 D.O. F. F/T sensor are determined by using the condition number.

• Journal of Acupuncture Research
• /
• v.26 no.6
• /
• pp.215-224
• /
• 2009

Objectives : Low back pain is the most prevalent condition for receiving Korean traditional medical treatment. The aim of this review is to provide fundamental data for development of low back pain classification and assessment criteria which can be used in clinical trials and clinical practice. Methods : Domestic and international clinical studies on oriental medicine treatment for low back pain were searched through on-line databases. The searched articles were reviewed and the evaluation tools used in the studies were investigated. Results : A total of 38 possibly relevant articles in Pubmed were identified, of which 34 articles included assessment criteria for low back pain. And 38 articles were reviewed in the Journal of Korean Oriental Medicine and the Journal of Korean Acupuncture & Moxibustion Society. 29 articles used pain scales, 24 used functional scales, and 20 among 34 articles in PubMed used both pain and functional scales. The majority of articles which published in Korea used worthless assessment scales of simple grades. There was no articles which used assessment scales related to the concepts of Korean traditional medicine. Conclusions : Our review of articles suggests that we would use both pain and functional scales. Future assessment scales should include the concepts of Korean traditional medicine.

• Proceedings of the KSME Conference
• /
• 2001.11b
• /
• pp.824-829
• /
• 2001

The main objective of the study is to provide the criteria for determining the proper life cycle of rebuiled diesel-electric locomotive currently being operated in KNR. We predicted the most critical sections of the underframes and tested the diesel-electric locomotive vehicle to measure dynamic stresses applied to the underframes. The fileld test of the diesel-electric locomotive estimated 17.08years based on the fatigue-life estimation when they are continuously used in the present operation condition.

• Proceedings of the KSR Conference
• /
• 2001.10a
• /
• pp.240-246
• /
• 2001

The main objective of the study is to provide the criteria for determining the proper life cycle of rebuiled diesel-electric locomotive currently being operated in KNR. We predicted the most critical sections of the cast-iron bogie and tested the diesel-electric locomotive vehicle to measure dynamic stresses applied to the bogie. The fileld test of the diesel-electric locomotive estimated 9.90years based on the fatigue-life estimation when they are continuously used in the present operation condition.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 1996.04a
• /
• pp.47-52
• /
• 1996

Interior noise, engine speed and vehicle speed are measured under road-load condition and interior noise signal is transformed by using the transient signal analysis methods such as the spectrogram and wavelet transform. Using the analyzed results, subjective noise criteria such as the loudness, noisiness and articulation index at each vehicle speed can be estimated and characteristics of interior noise for various running mode can be discussed in the viewpoint of noise quality.

• The Journal of Korean Medicine
• /
• v.28 no.3 s.71
• /
• pp.116-125
• /
• 2007

Objective : To overview the protocols of clinical acupuncture research on cancer in the USA. Methods : Using 'acupuncture' and 'cancer' as keyword search terms in Clinical Trials. gov, 28 clinical studies were found. Three studies by non-American institutions were excluded and 25 studies were analyzed. Analytic parameters were cancer condition, primary outcome, research institution, study design, and acupuncture intervention. Results : Breast cancer was the most frequent single condition in the searched protocols. Pain and quality of life were the primary outcomes in many studies. Memorial Sloan-Kettering Cancer Centerin New York has performed the largest number of acupuncture cancer studies. The majority of studies were randomized controlled trials with active controls or placebo/sham controls. Total enrollment varied between the range of 10 and 700 subjects and ages of these subjects were at least above 18 years old (except one protocol). Most protocols had strict exclusion criteria for acupuncture needling such as bleeding disorders, infection, heart disorder, and central nervous system disorder. Conclusions : Clinical acupuncture studies for cancer patients have focused on pain, quality of life, and side effects induced by anti-cancer therapies. Re-evaluation and cautions for strict exclusion criteria in foreign countries are required to perform multi-national acupuncture trials.

• Proceedings of the KSME Conference
• /
• 2001.06a
• /
• pp.825-830
• /
• 2001

Many techniques have been developed to evaluate the structural integrity for the traction motor with squirrel cage. However, the former approaches are not appropriate to our problems and there is no reliable specification for evaluation of squirrel cage motor. In this study, an improved boundary condition and the criteria for evaluation are proposed. Using 3-dimensional solid element, finite element model is generated. The number of meshes can be reduced by considering the symmetry of geometry. Stress analyses are carried out for three types of traction motors.

• Journal of the Korean GEO-environmental Society
• /
• v.8 no.3
• /
• pp.51-57
• /
• 2007

In the design of slopes during rainfall, the groundwater level is assumed to be located at the ground surface, based on the change in characteristics of rainfall. In addition, stability investigations are performed for large cut slopes in the design of slopes while standard inclinations specified in the design criteria are applied for the slopes that stability investigations are not performed. In spite of the strengthened criteria of groundwater location, slope failures continuously occur during heavy rainfall, regardless of magnitude of slopes. In order to investigate the cause of the failures, stability investigations have been performed on standard inclination of slopes suggested in the design criteria for both dry and rainfall cases by ground condition in this research. Despite that standard inclination of slopes specified in the design criteria should be stable for both dry and rainfall cases, the results show that standard factor of safety has not been obtained in many cases; more than 50% of total cases for dry cases and more than 65% of total cases for rainfall case. Based on the results, this paper indicates the problems in the current design criteria and proposes the plans for establishment of countermeasure.

• Hip & pelvis
• /
• v.35 no.1
• /
• pp.1-5
• /
• 2023

Piriformis syndrome is a common differential diagnosis related to sciatica. The following review provides a concise synopsis of the diagnosis, management, history, and alternatives to diagnosis of piriformis syndrome. A search of the literature for research articles related to piriformis syndrome and associated differential diagnosis of sciatica was conducted. A thorough review of the included articles found that the condition known as piriformis syndrome is over-diagnosed and that potential anatomic and biomechanical variations originating in the pelvic region might be related to the complaint of sciatica. The criteria for diagnosis are based on findings from both physical examination and radio imaging. Piriformis syndrome resembles a variety of clinical conditions; therefore, conduct of future studies should include development of a validated method for evaluation as well as clinical criteria for diagnosis of piriformis syndrome.