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불안정판 위에서 후방 유선형 신발이 척추기립근 및 하지 근 활성도에 미치는 영향
권혁규,권유정,박진현,Dennis W. Fell 대구대학교 특수교육재활과학연구소 2011 再活科學硏究 Vol.29 No.1
본 연구는 일반 신발과 후방 유선형 신발을 착용한 후 불안정판 위에서 척추세움근, 안쪽넓은근, 앞정강근, 장딴지근, 넙다리두갈래근의 근 활성도를 비교 하기 위한 것으로 성인 남녀 28명이 참가하였으며 대상자들은 일반 신발과 후방 유선형 신발을 신고 8단계의 BSS 기기 위에 15초 동안 서서 근활성도를 측정하였다. 이 연구의 결과를 종합해보면 후방 유선형 신발을 착용한 경우 일반 신발을 착용한 경우에 비해서 앞정강근과 안쪽 넓은근에서 상대적으로 더 높은 활성도를 보여주었다. 이러한 결과는 건강한 성인에서 후방 유선형 신발을 신었을 때 불안정한 면 위에서 균형을 유지하기 위해 발목의 자세 조절전략만으로도 균형을 유지하기에 충분한 것으로 생각되어진다. The purpose of this study was to compare muscle activation of erector spine and lower extremity such as tibialis anterior, gastrocnemius, medial hamstring and vastus medialis after wearing a pair of normal shoes and unstable shoes on the rocking surface. 28 university students who did not have any lower musculoskeletal and neurological disorders in the past were participated in this study. Each subject was standing for 15 seconds on the biodex stability system(BSS) of level 8 while wearing normal shoes and unstable shoes. we used Electromyography to measure muscle activation of elector spine and lower extremity and expressed muscle activation as a percentage of maximal voluntary isometric contraction (%MVIC). Paired t-test was used to compare the muscle activation of erector spine and lower extremity between normal shoes and unstable shoes. The result of this study was as follows. Tibialis anterior and vastus medialis showed relatively higher average electromyogram rates more than normal shoes(p<.05).
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설성경,최문정,권혁래 국제비교한국학회 2002 비교한국학 Comparative Korean Studies Vol.10 No.1
On the subject of Japanese invasion of Korea in 1592(briefly called Imjin Invasion), it was studied for the character of Korea-Japan historic literature; Imjinrok, Taikouki, Chosenseipatski. The approach was made focusing on the environment, narrative method, plot and the characters, consciousess of writers etc. This discussion can be briefed out as follows. First of all, Imjinrok of Chosun Dynasty has been written with a great influence from both practical literature and historic description after Imjin Invasion. The Chronicle recording can counted as one of the major method of narration. The Japanese works such as Taikouki and Chosenseipatski were made on the tradition of military literature of previous generation. One of distinctive feature is the beautification and the heroism that is introduced as the repose for the defeated. It comes from the intended efforts to shape the works as the historical records outwardly, continuously following the trend of military records of previous generations. When the plot is compared, it is as follows, It can be categorized on the narrative novels; before the war, in the beginning of the war, in the midst of war, in the end of war, Three different copies of Imjinrok are almost identical with the stage as the midst of war as the historical records. However, it shows big difference in the peace treaty is made after the death of Toyotomi Hediyoshi, but the Hangul version presents that the Samyunhdangs heroic story over the Japanese after the General Lee Sunsin furthering the final ending with colonialism over Japan. It is one of the important pattern that the important pattern that the writers consciousness is found from post-war novels, even in the historical narration. The plot of Taikouki is composed as two parts: the combat story telling the invasion to the Chosun and the non-combat story showing the personal glorification of Toyotomi. The combat story showing the personal glorification of Toyotomi, The combat story is generally written with victorious events of Japanese military and the sudden final end without a clear description over peace treaty with Ming Dynasty and the defeat of Japan. In the middle of the combat story, it is full with non-combat statement and anecdote designed to chant the glorious Toyotomi and his ruling. On the contrary, two works of chosenseipataki is filled with the combat story on the whole. The first half of the Hori-copy makes the description comparatively as it is, but the second half relatively centered on the battle against Ming. On the non-combat narration, it shows the strong will of the writer who is going to emphasize the ideology of Japanese king. The Oseiki-copy is similar with the Hory-copy, but it is added up with new anecdotes with extended explanation for some simple contents, particularly on the heroism for Toyotomi and the martial story of Gato and Konisi. The comparison between the chosun and the Japanese is tried from different perspectives of counter partner each other: Imjinrok with the brutal and avaricious hegemony of the Japanese, Tailouki and Chosenseipatski with the lustful and extravagant, incompetent martiality of the Chosun. Compared with characters and consciousness of writer, Imjinrok represents the type of royal personality and the inevitable Gods providence in detail. For the Chosun Dynasty, it is counted as the winning forces: civil volunteer soldiers, the royal military warlords, foreign troops from Ming Dynasty, the Royal ministers asking the augmentation troops of Ming. Among the three copies, it brings about the active roles of commanders of civil volunteer forces and generals, remarkably displaying royalty and patriotism. Meanwhile, Lee Sunsin is shaped as the most important character form lots of commanders. Out of the defeated generals, it is presented with the outstanding character with fidelity, surpassing over victorious generals. On the other works, the dispatched troops of Ming seems to play a decisive role in the descriptive narration. It can mean the meritorious achievement in the history, but it seems for the writer to consider Ming as the God-sent troops. What draws the attention is the active involvement of characters who is praised with superpower of with deity. On the Chinese copy of Kukdo, this phenomenon is found with partial involvements, but on the Hangul copies with decisive and overall roles. From the Hangul copies, it is understandable with detailed pattern as a the providence of a God, theorized with untouchable presence of the Chosun Dynasty whom is protected by an Heavenly God and the Budda from any Japanese intrusive invasion. In connection with the reality in fact, the recognition of the God providence is quite superficial, resulting in the evidence of conservative ideology of actual politics. The writers of Tiakouki and Chosunseipatski tried to depict the ideal supreme commander and warriorship with the introduction of characters: Toyotomi Hideyoshi, Gato Kiyomasa, Konisi Yukinaga etc. It seems to foster the warrior spirit by the guideline of warrior way for the next generation. It is also originated from the intention to serve repose of the Toyotomi family, which is defeated by the Tokugawa Shogun.
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RF Set Point Determination of the PEFP RFQ by Measuring the Beam Current
Hyeok-Jung Kwon,Han-Sung Kim,Ji-Ho Jang,Yong-Sub Cho 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.I
One of the goals of the Proton Engineering Frontier Project (PEFP) is to construct a 100-MeV proton accelerator. A 3-MeV radio frequency quadrupole (RFQ) has been designed, fabricated and installed and is being tested at the Korea Atomic Energy Research Institute (KAERI) site as a front-end system for the 100-MeV accelerator. The RF power set point should be determined during the initial tests of the RFQ to operate the machine properly. We determined the RF set point by comparing the measured output beam current of the RFQ with the calculated results. By measuring only the accelerated beam current, this method provides a direct method for determining of the RF set point with less ambiguity or complexity compared with other methods. The results showed that the determined set point was about 4 \% higher than the designed one.
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Carcinosarcoma of the Liver: A Case Report
Jung Hyeok Kwon,Yu Na Kang,Koo Jeong Kang 대한영상의학회 2007 Korean Journal of Radiology Vol.8 No.4
Primary hepatic carcinosarcoma is a rare tumor comprised of a mixture of carcinomatous and sarcomatous elements. Less than 20 adequately documented cases have been reported, however the imaging features of two cases were briefly described. We present here a case of carcinosarcoma of the liver in a 46-year-old woman, which was confirmed based on pathology. Imaging showed a large mass with large necrotic portions, small cystic portions, calcifications and bone formations.
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( Jung Hyeok Kwon ) The Editorial Office of Gut and Liver 2010 Gut and Liver Vol.4 No.s1
Percutaneous ethanol injection (PEI) therapy has been replaced by more-effective thermal ablation techniques that have lower local recurrence rates. However, PEI therapy remains useful in certain settings. Since PEI can be performed in any portion of the liver, PEI therapy can be valuable when tumors are located in close proximity to intestinal loops or other positions that are risky for thermal local ablative techniques. PEI therapy is also valuable in other situations where radiofrequency ablation (RFA) is difficult, including technically difficult masses that are not detected with ultrasound (US), are located in the hepatic dome, in the subcapsular area, and exophytically, or are surrounded by large vessels. PEI therapy contributes to combination therapy with transcatheter arterial chemoembolization or RFA in advanced-stage hepatocellular carcinoma (HCC), and also to the treatment of large HCC or extrahepatic metastasis from HCC. These roles of PEI therapy should be stressed for the treatment of HCCs in appropriate clinical situations. This comprehensive review of articles related to PEI therapy illustrates the recent role and indications of this therapy, which is currently valuable for HCC in the era of RFA. (Gut Liver 2010;4(Suppl. 1):S105-112)
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RF Characteristics of Four Independent DTL Tanks Driven by a Single Klystron
Hyeok-Jung Kwon,Han-Sung Kim,Ji-ho Jang,Yong-sub Cho 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.3
A 20 MeV proton accelerator has been developed by the Proton Engineering Frontier Project (PEFP). It consists of a 50 keV proton injector, a 3 MeV radio frequency quadrupole (RFQ) and a 20-MeV drift tube linac (DTL). The unique feature of the PEFP 20-MeV DTL is that four independent tanks are driven by a single klystron. The operation schemes are such that the independent rf characteristics of each tank are compensated for by the DTL wall temperature whereas the overall resonant condition is controlled by the coolant temperature of the drift tubes. To verify the operation scheme, we measured the relative rf phases among the tanks and the resonant frequency change of the reference tank during accelerator operation. The results showed that the maximum relative phase deviation was 2.5 degrees, which was caused by a variation in the temperature of the tank wall and the maximum resonant frequency deviation of the reference tank was 0.5 kHz, which was governed by changes in the temperature of the cooling water. A 20 MeV proton accelerator has been developed by the Proton Engineering Frontier Project (PEFP). It consists of a 50 keV proton injector, a 3 MeV radio frequency quadrupole (RFQ) and a 20-MeV drift tube linac (DTL). The unique feature of the PEFP 20-MeV DTL is that four independent tanks are driven by a single klystron. The operation schemes are such that the independent rf characteristics of each tank are compensated for by the DTL wall temperature whereas the overall resonant condition is controlled by the coolant temperature of the drift tubes. To verify the operation scheme, we measured the relative rf phases among the tanks and the resonant frequency change of the reference tank during accelerator operation. The results showed that the maximum relative phase deviation was 2.5 degrees, which was caused by a variation in the temperature of the tank wall and the maximum resonant frequency deviation of the reference tank was 0.5 kHz, which was governed by changes in the temperature of the cooling water.
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Error Analysis of the PEFP RFQ
Hyeok-Jung Kwon,Han-Sung Kim,Kyung-Tae Seol,Yong-Sub Cho 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.4
A 3-MeV radio frequency quadrupole (RFQ) has been developed as a front-end component of the Proton Engineering Frontier Project (PEFP) 100-MeV proton linear accelerator. Because the frequency and the field profile are very sensitive to the mechanical error of the RFQ vane, vane alignment is required before brazing. When the initial alignment was performed, it was noticed that the measured resonant frequency of each section was 3 4 MHz higher than the designed frequency of 349.336 MHz and that the field profiles deviated from the designed value. To understand the differences between the measured RF parameters and the designed values, we proposed an error analysis method. The proposed error analysis method included several types of mechanical errors in the RFQ structures and their effects. The study showed that all the vane tips of PEFP RFQ section 3 and section 4 had dimensional errors of .0.1 mm and that two major vanes were consistently shifted from their designed positions by ±0.05 . 0.10 mm. Those errors could be compensated for by using slug tuners.p눊릲?릹
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