• Proceedings of the Korea Water Resources Association Conference
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• 2017.05a
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• pp.66-66
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• 2017

Hydraulic jump is typically designed to occur over low-haed dam spillways and weirs in the river. An important engineering application of the hydraulic jump is to dissipate the intense kinetic energy of the flows over such hydraulic structures. Turbulent flow and roller-like vortex riding up the free sureface of the jump cause most of the energy dissipation. We carry out a high resolution three-dimensional numerical simulations of a submerged hydraulic jump in a spillway and compare numerical results with a laboratory measurement obtained by the PIV. The numerical results further show the dynamic behavoirs of the inner and outer layers of the submerged wall-jet and the recirculating roller of the hydraulic jump.

• Journal of dental hygiene science
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• v.5 no.2
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• pp.71-76
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• 2005

This study tried to understand influence of water fluoridation program on oral health status and get the basic data of water fluoridation program in the future. Sangdang-gu in Cheongju City, fluoridated community and Manan-gu in Anyang City, non-fluoridated community were the surveyed area of the study. And from July 3, 2003 to July 22, 2003, using questionnaire, we surveyed opinions of parents of the fifth and sixth grade students of C elementary school in Sangdang-gu, Cheongju City and A elementary school in Manan-gu, Anyang City about water fluoridation program, and made an oral examination on the fifth and sixth grade students. The results are as follows : 1. DMFT index was lower for Cheongju, fluoridated community with Cheongju 1.69, Anyang 2.11(P = .010). 2. DMFT rate was lower for Cheongju, fluoridated community with Cheongju 6.72%, Anyang 7.94%. 3. Health level of the first molar was higher for Cheongju, fluoridated community with Cheongju 95.54%, Anyang 94.10%(P = .002). This study intends to understand the effects of fluoridation program on oral status by analyzing the effects of water fluoridation program and present basic materials for improving oral health. Improving national oral health is thought to be associated with expense retrenchment of oral health insurance financial. So it may need to extend using tap water to all the area of the country and additionally establish confidence through an active public relations and education of water fluoridation program.

• Journal of the Korean Society of Radiology
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• v.6 no.3
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• pp.197-200
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• 2012

This research investigated Takju alcohol content in the case of irradiation changes in the statistical analysis was performed to visually. Lower proof alcohol fermentation Takju traditional and largely maintained 6 degrees, from the heat sterilization process is controlled through the distribution period. Most of the existing irradiation is focused on preservation of the product, but this study of the quality characteristics of the mechanical changes in alcohol was to seek value. Takju Celsius to $15^{\circ}C$, while maintaining the experiment were kept in the state. Radiation devices Varian Clinac ix, 2010 (Max. 10MV) using the field size $150mm{\times}150mm$, SSD 100 cm at 40kVp 1, 4, 7, 10, 13, 15, 20Gy were vertical. KJELDAHL APPARATUS, C-H6 Alcohol frequency was measured using. The results according to the change of the radiation dose alcohol did not show the sudden change of frequency, were observed at similar levels decreased. This study simply due to the radiation dose to be served, but to find the change in the future with a greater sense of quality changes should be considered.

• Journal of the Korean Orthopaedic Association
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• v.55 no.1
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• pp.29-37
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• 2020

Manual therapy has undergone parallel development throughout many parts of the world dating back to ancient times for at least 2,500 years. The earliest historical reference to the practice of manual therapy in Greece, dates back to 400 B.C. Over the centuries, manual medicines have fallen in and out of favor with the medical profession. To truly understand the principle, it is important to know that manual therapy was initially the mainstay of the three leading alternative health care systems, osteopathy, chiropractic, and most notably physical therapy. These were all founded in the latter part of the 19th century in response to the shortcomings in allopathic medicine. Although it has been around for a long time and has been used all over the world, there are a few reports on manual therapy treatment, and most papers provided a low level of evidence. Despite the controversies over manual therapy, its use appears to be increasing gradually. This article reviews the history of manual therapy from ancient times to the present including Korean history, discusses the current state of knowledge on manual therapy, and informs physicians who manage musculoskeletal pain.

• Water for future
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• v.28 no.3
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• pp.83-87
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• 1995

• Communications for Statistical Applications and Methods
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• v.15 no.1
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• pp.1-11
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• 2008

For a large data set the high computational cost of estimating the parameters of normal mixtures with the conventional EM algorithm is crucially impedimental in applying the algorithm to the areas requiring high speed computation such as real-time speech recognition. Simulations show that the binned EM algorithm, being compared to the standard one, significantly reduces the cost of computation without loss in accuracy of the final estimates.

• Proceedings of the Korean Society of Computer Information Conference
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• 2017.07a
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• pp.340-341
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• 2017

본 논문에서는 근골격계 질환 중에서 종종 발생하는 어깨 부위의 질환에 대하여 알아보도록 한다. 본 논문에서는 팔을 반듯이 위로 올렸을 때 통증이 발생하는 어깨 질환에 대한 도수치료법을 제시한다. 실험에서는 도수진단을 위하여 팔을 반듯이 위로 올릴 때 팔의 각도를 입력하고, 이상이 발생할 시 진단 및 치료법까지 시스템에서 제시한다.

• Proceedings of the Korea Water Resources Association Conference
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• 2009.05a
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• pp.2063-2067
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• 2009

하천의 효율적 이용에 대한 시민들의 인식 변화로 도시하천의 친수공간에 대한 관심과 이용증가 추세에 따라 도시하천의 수질개선이 필요한 실정이다. 특히 하천유량에 해수가 지배적인 하구가 바다에 접한 감조하천의 경우 해수도수에 의한 하천 수질개선방안들이 강구되고 있다. 따라서 본 연구의 목적은 도시하천에 해수 유입에 따른 하천에의 영향을 분석하기 위해서 수질모의를 통해 수질개선효과를 분석하였다. 본 연구를 위하여 대상하천으로 도시하천이며 감조하천인 부산광역시 소재 동천으로 하였고, 수질모의모형으로 WASP7(Water Quality Analysis Simulation Program Ver, 7)과 RMA-4를 이용하여 수질분석과 대상물질의 이송과 확산을 분석하였다. 현재 동천의 경우 목표수질을 하천수질기준 중 DO 농도를 기준으로 하고 있어 본 연구에서도 DO 농도를 주 분석대상으로 하여 연구를 진행하였다. 동천의 WASP7 모형과 RMA-4 모형을 구축하고 현재 동천의 수질이 목표수질에 도달할 수 있는 적정 해수도수량을 산정하였다. 그리고 효율적인 수질개선을 위하여 도수한 해수를 분배하여 방류하는 방안을 검토하여 적정 분배지점과 적정 분배유량을 산정하였다. 향후의 연구에서는 염도 등 기타 수질항목의 검토가 필요하고, 본 연구에서 수행한 루틴은 다른 하천에서의 해수도수에 의한 수질개선효과 분석에 이용될 수 있을 것이라 판단된다.

• Journal of Korean Ophthalmic Optics Society
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• v.2 no.1
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• pp.61-76
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• 1997

In this paper, we found out the objective refractive errors, the full corrective refractive powers, and the prescriptions for 64 males and 36 females aged 18 to 26 years. To increase the unaided visual acuity 0.1 to the aided visual acuity 1.0 with the glasses, we needed the spherical equivalent refractive power of -3.00D for male and -2.91D for female respectively. To increase the unaided visual acuity 0.5 to the aided visual acuity 1.0 with the glasses, we needed the spherical equivalent refractive power of -0.5D for male and -1.38D for female respectively. Comparing unaided visual acuity and corrective refractive power, the more one has refractive error the less one has unaided visual acuity but these are not linear relationships. Comparing objective refractive error figures, full corrective refractive power figures and prescriptions, objective refractive error figures are the hightest, followed by full corrective refractive power figures. Prescriptions compared with the other two are lower. The cylindrical refractive powers are less than -2.50D. In this study, with the rule astigmatism is dominant over against the rule astigmatism and oblique astigmatism. The accommodation measured by push up method is 6.75D~10.04D for male and 7.50D~9.60D for female respectively.

• Journal of Korea Water Resources Association
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• v.48 no.2
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• pp.137-147
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• 2015

This study performed the systematic classification of the various types of riffles and analyzed their physical and hydraulic characteristics at the Hongcheon River and Seomjin River. The riffles are classified into the long type and the wide type by their ratio of length and width, and also classified into the convergent type and the divergent type by their width change along flow direction. They are also classified into the falling type, the running type, the undular wave and the undular jump by their surface profiles. The falling type and the running type usually occur near the cobbles with multiple diameters, whereas the undular wave and the undular jump occur near the small pebbles. They showed the upward convex type at the middle part, and the slope gets bigger at the downstream part.