한발서기 동안 동측, 반대측 방향의 상지부하가 다리근육의 근활성도에 미치는 영향

허재석,이상열 대한물리치료과학회 2020 대한물리치료과학회지 Vol.27 No.1

Background: The purpose of this study was to investigate the effects of ipsilateral and contralateral load changes during single-leg standing on the leg muscle activities of healthy people. Design: Randomized controlled trial. Methods: For all the subjects, a load was randomly applied to the ipsilateral or the contralateral side. While the load was applied, the subject raised a hand and then performed single-leg standing for 10 seconds using the dominant side. Results: During single-leg standing, the muscle activity of the gluteus medius, peroneus longus on the supporting side increased statistically significantly when an upper limb load was applied contralaterally, but no statistically significant differences were detected in the muscle activities of the tibialis anterior and the gastrocnemius using a test of within-subjects effects. Conclusion: It can be seen that muscle activities increase during exercise when the amount and frequency of a load are increased and when the same load is applied to different sides of the body. Such muscle activity increases may be applied to change the intensity of exercise when one is in a static posture, such as during single-leg standing.

移動動詞の格表示と「ている」の意味解釈との関係―韓国語との対照の観点から―

허재석 한국일본학회 2009 日本學報 Vol.79 No.-

本稿では、日韓両言語のアスペクト的意味の違いを生じさせる一つの要因として移動動詞の格パターンに注目している。移動格として起点・移動経路・着点の3分類をし、それぞれ両言語のアスペクト的意味の共通点と相違点を明らかにすることを目指す。日本語のアスペクト研究は動詞だけを中心とした動詞アスペクト論と、格や副詞などを含む動詞句アスペクト論とに分かれるが、本稿は後者の立場に立って論じていく。 まず、動作進行の解釈に関して、韓国語は起点あるいは着点の内部(領域内)での移動を捉えることができ、動作進行の解釈がされやすいが、日本語は起点あるいは着点を離れたかどうかが問題で領域内での移動が捉えられず、動作進行の解釈がされにくいようである。 また、結果解釈に関して、日本語は起点「から」格と「を」の間において若干許容度の違いが見られるが、韓国語は起点「에서」格と「를」格とが同様に捉えられる。 一方、韓国語の場合、起点「에서/를」格と共起する移動動詞の中には結果解釈がされにくいものがあるが、これは韓国語の「어 있다」にまだ存在動詞の影響が強く残っていることと関係しているものと見られる。 このような分析は動詞レベルではなく、動詞句レベルからアスペクト的意味を見ていくことにより捉えられる現象である。近年、このような動詞句レベルのアスペクトを捉えていく研究が増えていることも注目される。

日本語の 「タ」のム一ド的意味用法について ―韓国語との対照の観点から―

허재석 한국일본학회 2008 日本學報 Vol.74 No.-

ムード的な意味の「タ」は動きが発話時以後であっても用いられるが、これは話者の認識時や発見時が発 話時以前であるからだろう。最近の先行研究でもこのような点に注目しているようであるが、本稿で挙げてい る「発見」「決定」「未来の状況に対する確信」などの「タ」の使用条件についてはいまだに明らかにされていない ところがあると思われる。本稿では、この三つのパターンの「タ」の使用条件を見極めつつ、韓国語の「었」と の対照を行った。 まず、「発見」の場合、話者が発見した状態が認識内で「想定していた」状態か否かにより、「タ」と「었」の 許容度の差があり、「었」は発見した状態が認識内で「想定していた」状態と一致するような文脈においては「タ」 に比べて用いられにくい。一方、発見状態と認識状態との食い違いが生じるような文脈になると、「었」の許 容度が上がるようである。 また、「決定」の場合、聞き手の存在有無により、「タ」の許容度の違いが生じ、聞き手のいない場面では 「タ」が用いられない。その上、聞き手が存在しても宣言と同時に行為が開始しないと許容度が落ちてしま う。一方、「었」はこの「決定」の用法には馴染まない。 さらに、「未来の状況に対する確信」の場合、「タ」は「行為者=話し手」という前提条件を満たさないと、 許容度がかなり落ちるが、「었」の使用にはこの前提条件は不可欠なものではない。本稿では、「었」が一種 の状態化形式として機能しており、動き動詞の過去形が「発見」の用法に用いられる要因であると考える。

사례기반추론을 이용한 자동창고의 위치 할당 및 입/출고 순간 스케줄링 기법

허재석,양용석,임성민,박인범,채문정,김관호,박종헌 한국경영과학회 2015 한국경영과학회 학술대회논문집 Vol.2015 No.4

Implementation of Data Assimilation Methodology for Physical Model Uncertainty Evaluation using Post-CHF Experimental Data

허재석,이성욱,김경두 한국원자력학회 2014 Nuclear Engineering and Technology Vol.46 No.5

The Best Estimate Plus Uncertainty (BEPU) method has been widely used to evaluate the uncertaintyof a best-estimate thermal hydraulic system code against a figure of merit. This uncertainty is typicallyevaluated based on the physical model’s uncertainties determined by expert judgment. This paperintroduces the application of data assimilation methodology to determine the uncertainty bands ofthe physical models, e.g., the mean value and standard deviation of the parameters, based upon thestatistical approach rather than expert judgment. Data assimilation suggests a mathematicalmethodology for the best estimate bias and the uncertainties of the physical models which optimizethe system response following the calibration of model parameters and responses. The mathematicalapproaches include deterministic and probabilistic methods of data assimilation to solve bothlinear and nonlinear problems with the a posteriori distribution of parameters derived based onBayes’ theorem. The inverse problem was solved analytically to obtain the mean value and standarddeviation of the parameters assuming Gaussian distributions for the parameters and responses, and asampling method was utilized to illustrate the non-Gaussian a posteriori distributions ofparameters. SPACE is used to demonstrate the data assimilation method by determining the bias andthe uncertainty bands of the physical models employing Bennett’s heated tube test data and Becker’spost critical heat flux experimental data. Based on the results of the data assimilation process,the major sources of the modeling uncertainties were identified for furthermodel development.

수도의 증발산량 추정방법에 관한 연구

허재석,정하우 한국농공학회 1983 한국농공학회논문집 Vol.25 No.2

Evapotranspiration is a major factor determining the water consumption in the rice fields. Therefore, realistic evapotranspiration estimates are important to the agricultural water resources planning. In Korea, however, the Blaney-Criddle formula, which was developed under the meteorological condition of western arid United States and the upland cultivation, has been widely used to estimate evapotranspiration from paddy fields. Hence, it has considered that the Blaney-Criddle formula would not be the proper method for the Korean paddy condition. The purpose of this study is to select the most appropriate and realistic method for estimating evapotranspiraion from paddy field in Korea and to derive crop coefficients using the chosen method. The results are summerized as follows. 1. Total seasonal-average evapotranspiration by the field observation was 660mm for Tongil and 621. Ornm for the Japonica variety of rice. The amount of evapotranspiration for Tongil variety was 6% larger than that of the Japonica variety. 2. There was no significant differences in the amount of evapotranspiration among early, middle and late mature varieties, that is, early 638mm, middle 627mm and late 630mm for the whole growing season. 3. The rate of peak evapotranspiration appeared at the beginning of August and was in the range of 7.7-8. Omm/day according to the different mature varieties. 4. The correlation between pan evaporation data and the calculated evapotranspiration using related meteorological data from various methods suggested such as Radiation (FAO), Hargreaves, Christiansen, Hargreaves-Christiansen, Jensen-Haise, showed high statistic significance. Therefore, it seemed to use those formulars in estimating evapotranspiration inste4 of using pan evaporation data. 5. It was concluded from the analysis of field data that the evapotranspiration estimate for Blaney-Criddle method might not be appropriate in Korea. On the other hand, Penman equation showed more accurate estimation at the flourishing stage of rice than the pan evaporation method. 6. The crop coefficients for the Penman and pan-evaporation method were obtained by graphical representation.

EEG Studies on Physical Discomforts Induced by Virtual Reality Gaming

허재석,윤길원 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.3

Physical discomforts, such as sickness, experienced during virtual reality (VR) gaming were analyzed using electroencephalography (EEG). Correlations between the results of a survey on the physical discomforts felt during a head mounted 360° VR gaming and EEGs were analyzed. EEGs were measured using 19 electrodes before, during, and after VR gaming. The brain was categorized into eight regions and EEGs were analyzed for each region. After gaming, a questionnaire was completed, and correlations between the scores of nausea, ocular discomfort, and disorientation and EEGs were examined. Before and during VR, there were substantial changes in the absolute power and relative power bands depending on the region of interest. The analysis of correlations with the physical discomforts classifed based on the questionnaire showed that the theta and beta waves from the occipital and temporal lobes exhibited signifcant correlations. The EEGs before and after VR gaming did not exhibit signifcant changes. In this study, a qualitative analysis on the physical discomforts occurring during VR was conducted based on EEG. We expect that EEG can be utilized in providing customized VR capable of minimizing physical discomforts by analyzing the EEG measured in real time and providing feedback to VR gaming.

現代日本語における「た」形と「ている」形の関係

許宰碩 한국외국어대학교 일본연구소 2009 日本硏究 Vol.40 No.-

現代日本語のアスペクト研究は奥田(1978)に至ってそれ以前の語彙的なアスペクト研究から体系的なアスペクト研究に展開していく。本稿はこのような研究の流れに沿って「た」と「ている」の関係を体系的に捉えようとしたものである。動き動詞の 「た」と「ている」は変化時点を媒介にして連続している。変化時点というのは、「していない」状態と「ている」との切り替え時点であるが、「た」と「ている」はこの変化時点の前後に位置づけられるのである。「た」は変化時点が発話時以前であることを表し、「ている」は変化時点以後の状態が発話時まで持続していることを表している。 また、「ている」に関して、話し手が捉えている状態の区間を[認識想定区間]としているが、この[認識想定区間]が発話時以前であれば、発話時までの状態の持続とは関係なく、「ていた」にしなければならない。 近年、現代日本語のアスペクト研究は、動詞だけでなく、動詞句レベルにおいてアスペクト的意味を捉えようとする試みも見られる。本稿の<状況変化>は、この動詞句レベルからも捉えられる概念であるといえるだろう。

검사실 조명이 뇌파검사 중 광자극에 미치는 영향

허재석,김승용(공동조자),구희근(공동조자),김기원(공동조자),이창희(공동조자),최장욱(공동조자),배난영(공동조자),최완수(교신저자) 대한임상병리사협회 2014 임상생리검사학회 발표자료집 Vol.2014 No.-

배경(Background) : 밝은 상황에서의 광자극이 환자에게 정확하게 자극이 되는지 알아보기 위해 암실 상황과 형광등이 켜져 있는 두 가지 상황에서의 빛의 밝기를 측정할 수 있는 조도계를 이용하여 광자극의 밝기를 측정해 검사환경의 밝기가 뇌파검사 중 광자극에 어떠한 영향이 있는지 알아보았다. 방법 (Methods): 램프와 조도계의 거리는 30cm로 하고 빛의 자극은 10초, 각 자극간의 간격은 10초로 하여 암실과 형광 등의 조건에서 각각 측정하여 조도를 기록하였다. 보다 자세한 측정을 하기 위해 Spectometer를 이용하여 두 상황에서의 데이터를 분석하여 보았다. 결과(Results) : 2~20Hz에서 모우 p-value가 0.05 이하의 결과를 보여주며 조명에 대한 빛의 간섭이 광자극에 영향을 주는 것으로 나타났다. 그 중 12Hz는 가장 낮은 p-value인 0.008이 나왔다. 25Hz, 30hz에서는 모든 값이 p-value는 0.1 이상으로 그 의미가 작았다. 고찰(Discussion): 뇌파검사 중 광자극에 중에서 의미가 높은 8~15Hz사이의 모든 결과 같이 영향을 주는 것으로 나타났으며 이것을 바탕으로 검사실에 대한 조명도 환자가 받는 광자극에 영향이 있을 수 있다는 것을 알 수 있었다. 준비된 검사실이 아닌 응급실이나, 중환자실에서 할 때는 협조를 받아 조명을 끄고 뇌파검사 중 광자극을 실시하면 더 좋은 결과를 얻을 수 있을 것으로 판단된다.

배관 진동저감 마찰 지지대 최적 위치 선정

허재석,장용훈,백승훈 한국음향학회 2022 韓國音響學會誌 Vol.41 No.6

일반적으로 배관에서 발생하는 진동은 배관을 파손시키는 문제를 넘어 배관 파손으로 유발되는 다른 위험한문제의 원인이 된다. 배관 진동의 원인 분석과 이를 줄이기 위한 수많은 연구들이 존재하는데, 그 중 마찰 지지대를 이용한 배관 진동저감에 대한 연구가 소수 진행되고 있다. 하지만 마찰 지지대에 관한 연구들은 마찰 지지대 성능 예측과평가에만 집중하였고, 지지대 설치 위치에 따라 달라지는 마찰 지지대의 효과는 고려하지 않았다. 따라서, 본 연구에서는 마찰 지지대의 설치 위치에 따른 배관 진동 저감 효과를 입증하고 전체 시스템의 진동을 줄이기 위한 마찰 지지대위치 선정 방법을 제시한다. 설계단계에서 최적화 방법을 효과적으로 적용하기 위해 선형 해석으로만 마찰 지지대의최적 위치를 예측하고, 설계된 마찰 지지대를 시간 영역 해석을 통해 방법론의 타당성을 입증하였다. 또한, 배관 시스템에서 마찰 지지대의 우수한 진동 저감 효과를 정량적으로 해석하여, 지지대 설치 위치를 예측하는 방법의 효용성을 증명하였다.