• 한국농공학회논문집
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• 제46권5호
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• pp.41-52
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• 2004

In this study, parameters of long and short term runoff model were optimized using genetic algorithm as a basic research for integrated water management in a watershed. In case of Korea where drought and flood occurr frequently, the integrated water management is necessary to minimize possible damage of drought and flood. Modified TANK model was optimized as a long term runoff model and storage-function model was optimized as a short term runoff model. Besides distinguished parameters were applied to modified TANK model for supplementing defect that the model estimates less runoff in the storm period. As a result of application, simulated long and short term runoff results showed 7% and 5% improvement compared with before optimized on the average. In case of modified TANK model using distinguished parameters, the simulated runoff after optimized showed more interrelationship than before optimized. Therefore, modified TANK model can be applied for the long term water balance as an integrated water management in a watershed. In case of storage-function model, simulated runoff in the storm period showed high interrelationship with observed one. These optimized models can be applied for the runoff analysis of watershed.

• 말소리와 음성과학
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• 제12권3호
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• pp.15-23
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• 2020

This study examines the duration of Korean lax and tense stops in the prosodic word-medial position, their interactions with nearby segments, and the phonological implications of these interactions. It first examines the lengthening of consonants at the function of the short lax stop. Experiment 1 shows that the sonorant C1 is significantly longer before a short lax stop C2 than before a long tense stop. Experiment 2 shows that the short lax stop C1 cancels the contrast between the lax and tense obstruent at C2, making them appear as long tense obstruents (Post-Stop Tensing Rule). We suggest that such lengthening phenomena occur in Korean to robustly preserve the contrastive length difference between C and CC. Second, this study examines the vowel shortening, known as Closed-Syllable Vowel Shortening, before a long tense stop or before the consonant sequence. Experiment 3 suggests that it be interpreted as temporal adjustment to make the interval from the onset of a vowel to the onset of the following vowel of near-equal length. Conclusively, we suggest that Korean speech be planned and controlled with two specific intervals. One is the duration of contrastive consonant intervals between vowels, and the other is the duration from the onset of a vowel to the onset of the following vowel.

• 천문학회보
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• 제44권1호
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• pp.52.3-52.3
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• 2019

We investigate a relative contribution from short to long-term flaring rate to predicting M and X-class flare probabilities. In this study, we consider magnetic parameters summarizing distribution and non-potentiality by Solar Dynamics Observatory/Helioseimic and Magnetic Imager and flare list by Geostationary Operational Environmental Satellites. A short-term rate is the number of major flares that occurred in an given active region (AR) within one day before the prediction time. A mid-term rate is a mean flaring rate from the AR appearance day to one day before the prediction time. A long-term rate is a rate determined from a relationship between magnetic parameter values of ARs and their flaring rates from 2010 May to 2015 April. In our model, the predicted rate is given by the combination of weighted three rates satisfying that their sum of the weights is 1. We calculate Brier skill scores (BSSs) for investigating weights of three terms giving the best prediction performance using ARs from 2015 April to 2018 April. The BSS (0.22) of the model with only long-term is higher than that with only short-term or mid-term. When short or mid-term are considered additionally, the BSSs are improved. Our model has the best performance (BSS = 0.29) when all three terms are considered, and their relative contribution from short to long-term rate are 19%, 23%, and 58%, respectively. This model seems to be more effective when predicting active solar ARs having several major flares.

• The Journal of Asian Finance, Economics and Business
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• 제9권4호
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• pp.239-250
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• 2022

This study examined the level of capital structure and its determinants of publicly traded companies in Malaysia before and after the COVID-19 pandemic. The data for this study was examined using Python Programming Language and time-series financial data from 2,784 quarterly observations in 2019 and 2020. The maximum debt is larger before the COVID-19 period, according to the findings. During the COVID-19 period, short-term debts and total debts have both decreased slightly. However, long-term debts have increased marginally. As a result, this research demonstrates that the capital structure has changed slightly during the COVID-19 period. The findings imply that independent of the capital structure proxies, tangibility, liquidity, and business size had an impact on capital structure in both periods. It was found that profitability had a significant impact on total debts both before and after the COVID-19 crisis. While higher-profit enterprises appear to have lesser short-term debts before the COVID-19 periods, they are also more likely to have lower long-term debts during the COVID-19 periods. Even though growing companies tend to have higher short-term debts and thus total debts during those periods, longterm debts are unaffected by potential growth.

• 재무관리논총
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• 제2권2호
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• pp.315-344
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• 1995

The relationship of information flow and market price formation are central to the basic tenets of financial economics. Whereas information is usually treated as being either public or private(monopolistic), most empirical studies focus on the price effects of public announcements. More recent research has centered more on the role of private information, such as insider trading, in efficient pricing and whether such trading increases investor welfare. Typically, 'insider trading' refers to an officer that trades in his/her company's shares. Insider trading, however, also refers to anyone who generates private, albeit costly, information concerning a stock's fundamental value. Normally, such insider activity is more difficult to ascertain. One way in which negative information is revealed is through short-selling activity, especially the monthly short-interest positions reported by the national stock exchanges. Diamond and Verrecchia(1987) provide a theoretical paradigm that predicts a negative price adjustment upon announcement of n company's monthly short interest, if the short interest displays an unusual increase and is correlated with negative information that is not yet public. Empirical studies of the short-run, negative price effect predicted by Diamond and Verrecchia find mixed results. One explanation is that the time period studied is too short for the market to absorb the informational content of these announcements. One reason is that these announcements are an ambiguous signal that requires more individuals and time to collect and act on the same information before full revelation occurs or before the implicit information becomes publicly known. This 'long delayed reaction' also serves as a motivation for related research on the wealth effect of mergers, share repurchases, and initial equity offerings in which long-run performance differs from the initial, short-run reaction to such announcements or offerings.

• International journal of advanced smart convergence
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• 제12권4호
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• pp.55-62
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• 2023

Slotted-Aloha (S-Aloha) has been widely employed in random access networks owing to its simple implementation in a distributed manner. To enhance the throughput performance of the S-Aloha, connection-based slotted-Aloha (CS-Aloha) has been proposed in recent years. The fundamental principle of the CS-Aloha is to establish a connection with a short-sized request packet before transmitting data packets. Subsequently, the connected node transmits long-sized data packets in a batch of size M. This approach efficiently reduces collisions, resulting in improved throughput compared to the S-Aloha, particularly for a large M. In this paper, we address the short-term fairness of the CS-Aloha, as quantified by Jain's fairness index. Specifically, we evaluate how equitably the CS-Aloha allocatestime slots to all nodes in the network within a finite time interval. Through simulation studies, we identify the impact of system parameters on the short-term fairness of the CS-Aloha and propose an optimal transmission probability to support short-term fairness.

• 대한간호학회지
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• 제30권1호
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• pp.29-38
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• 2000

To determine whether personal history of lactation in premenopausal women influence bone mineral density, a cross-sectional study was conducted. One hundred eighty-four premenopausal women were selected from women who had been checked for bone mineral density by dual energy x-ray absortiometry in lumbar spine, femoral neck, Ward's triangle, and trochanteric site at general hospitals in Seoul and Pusan. They completed a questionnaire including life style factors and reproductive history. In the data analysis, Pearson correlation coefficients were used to test any association between individual variables and bone mineral density and a statistical comparisons between long term lactation(>24 months) and short term lactation(<24 months) were made by one way analysis of covariance. The results were summarized as follows: 1) There was no significant difference in the bone mineral density of the lumbar vertebrae in premenopausal women between the long term lactation group(>24months) and the short term lactation group(<24months). 2) There was no significant difference in the bone mineral density of the femur neck, Ward's triangle, and trochanteric site in premenopausal women between the long term lactation group (>24months) and the short term lactation group (<24months). Considering these results, we suggest prospective studies that measure bone mineral density before and after, in addition to those during lactation. We also suggest the further study with premenopausal women less than 35 who have achieved peak adult bone mass.

• 대한한방내과학회지
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• 제36권4호
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• pp.458-469
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• 2015

Objectives: Buja and Cheono, containing aconitine known for its cardiotoxicity, are not commonly prescribed, but they are necessary for some clinical conditions. Hence, consequences for electrocardiography (EKG) after short- and long-term dosage of herbal medicine including Buja and Cheono are here reported.Methods: From September 2014 to April 2015, 36 patients belonging to the sixth internal medicine department of the Dong Eui Oriental Medicine Hospital took herbal medicine including Buja and Cheono, and after these doses, they underwent an EKG. Thirty-one patients who took the medicine for 7-8 days comprised the short-term group, and 18 patients taking the medicine for 17-106 days comprised the long-term group. The results of the EKGs for each group, before and after dosage with herbal medicine, are compared.Results: No significant changes in EKG appeared in either the short- or the long-term group after taking herbal medicine including Buja and Cheono.Conclusions: If Buja or Cheono are prescribed along with other suitable herbs by a doctor of Korean medicine, no cardiac trouble will occur on an EKG regardless of the term of the dosage.

• 생물환경조절학회지
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• 제12권1호
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• pp.1-6
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• 2003

본 실험은 정식 후 단일처리전 장일처리 기간에 따른 온실재배 스프레이 절화국 Reagan Improved품종의 건물생산과 절화품질에 미치는 영향을 구명하기 위하여 네덜란드 Wageningen 대학의 유리온실 실험포에서 수행하였다. 정식 13-14일전에 피트블록에 삽목한 묘를 단위면적당 64줄기로 2000년 9월 6, 13, 20일에 각각 정식하였고, 2000년 9월 27일 모든 처리구에 단일처리를 실시하였다. 정식에서 최종조사일까지 장일처리 기간 3주 처리구에서는 84일이었고, 2주 처리구에서는 77일, 1주 처리구에서는 70일, 단일처리 후에 최종수확일까지는 63일이 소요되었다. 개화시기는 모든 처리구에서 동일하였다. 3주 장일처리구에서의 주당 꽃송이수는 1주 장일처리구에 비해 2개 더 많았고, 꽃의 생체중 및 건물중은 각각 식물 개체당 4g과 0.4g더 무거웠지만, 각 처리구별 꽃의 품질에는 큰 차이가 없었다. 최종건물생산량 ($g{\cdot}m^{-2}$ )은 3주 장일처리구에서 높고, 1주 장일처리구에서 가장 낮게 나타났다. 본 실험에서 단일처리 전 장일기간은 단일처리 후 개화시기에 영향을 주지 않았으며 꽃의 품질면에서도 큰 차이가 없었다. 반면 초장과 생체중은 장일 조건이 길수록 높았게 나타났으며, 누적 건물중도 3주 장일처리구에서 가장 높은 결과를 나타냈다. 장일처리 기간은 꽃 자체의 품질에 영향은 적었지만, 개체 생체중 및 초장에 매우 큰 영향을 미쳤으므로 단일처리전 장일처리 기간은 개체품질 및 연중재배 생산 시스템에서 균일한 품질을 생산하기 위해 장일처리 기간의 조절은 고품질의 국화생산에 중요한 요인으로 생각되었다..

• 인지과학
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• 제24권1호
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• pp.25-47
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• 2013

한국어 원어민을 대상으로 제시된 주어, 간접(여격) 목적어, 직접(대격) 목적어, 그리고 동사를 자유로이 배열하여 문장을 발화하도록 하는 실시간 문장산출 실험을 실시하였다. 실험의 결과는 (i) 간접 목적어와 직접 목적어의 길이가 동일할 경우 간접 목적어를 직접 목적어 앞에 두는 어순이 선호되지만, (ii) 관계절의 수식을 통해 두 목적어의 길이를 달리 했을 경우 격과 무관하게 길이가 긴 목적어를 짧은 목적어 앞에 두는 어순이 선호된다는 것을 입증하고 있다. 핵어후치 언어에서 관찰되는 이러한 'long before short' 선호도는 논항의 핵어들과 술어를 되도록 문장 끝부분에 밀집시켜 논항구조 처리의 효율성을 높이고자 하는 언어처리기제의 특성에 따른 것이라고 설명할 수 있다.