• Journal of the Korean Solar Energy Society
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• v.36 no.1
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• pp.1-9
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• 2016

To well design the solar energy system, the correlation to calculate and predict solar irradiation is basically needed. So, this study was performed to reveal the relationships between the solar irradiation and four meteorological observation data(dry-bulb temperature, relative humidity, duration of sunshine, and amount of cloud) that didn't show from previous any other researches. And then, we finally proposed the various order non-linear correlation from the measured solar irradiation and four meteorological measurement data using MINITAB. To show the deviation and accuracy of the solar irradiation between measured and calculated, this study compared for the daily total solar insolation. From those results, the calculation error could well predicted about maximum 97% for the daily total solar insolation. But, the coefficients of the proposed correlations didn't show any relationships. So, needs more studies to make the proper one correlation for the country.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2020.08a
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• pp.5-5
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• 2020

일반적으로 식물의 공급방법은 채집과 재배로 나눌 수 있으며, 자원식물은 상용화를 위해는 안정적 공급이 선행되어야 하므로 재배를 선호하고 있다. 재배방식은 다시 노지재배, 시설재배, Indoor Farm(식물공장)으로 나눌 수 있으며, 우리나라는 시설재배 중 비닐하우스 활용이 활발한 나라로 평가된다. 노지재배에 비해서는 시설재배가 온/습도 관리에 대해 장점을 가지고 있으며, Indoor Farm(식물공장)은 광량, 광질 및 일조시간까지 전체 생육조건의 조절이 가능하지만 초기투자비용 및 운영비용 등으로 인해 경제성이 낮아 아직까지는 상용되고 있지 않다. 자원식물의 경우 부가가치가 높아지는 후방사업으로 발달할 수 있으나, 화장품, 기능식품 또는 의약품으로 개발하기 위해서는 일정한 품질을 확보하여야 한다. 자원식물 재배 시 특정 성분의 함량을 일정하게 유지하기 위해서는 온/습도, 광량, 광질 등 생육환경을 관리할 수 있는 시설재배가 노지재배에 비해 적합하다. 하지만, 일부 자원식물의 경우에는 위도, 일조량 등으로 인해 국내에서는 시설재배로도 적절한 생육조건을 제공할 수 없어서 상업화하지 못한 경우가 많았다. 이에, (주)넥스트온은 Indoor Farm(식물공장) 전문기업으로서, 기존 자원식물 중 국내에서 시설재배로는 적절한 품질 확보가 불가했던 자원식물 및 특수 생육환경에서만 자생하는 희귀 자원식물의 양산화에 노력하고 있다.

• Journal of the Korea Society of Computer and Information
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• v.29 no.4
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• pp.177-182
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• 2024

A consumer's decisions are made by affection of product. Affection has types: evaluation, mood, emotion and sensibility that means unconscious changes. Previous researches have clarified weather factors affect to sensibility that means weather factors may have causal effects to consumer's decision making. This research utilize weather information from KMA(Korea Meteorological Administration) and SNS geographical information and text to make weather sensibility model, and clarify the model shows significant change to online shop customer's purchase behavior(purchase frequency) by merging customer's address information and geometric information of the model for apply weather model. As a result, a model utilize daily precipitation, sunshine hours, average ground temperature, and average relative humidity makes significant result to e-commerce purchase behavior frequency.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.8
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• pp.26-35
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• 2020

Tunnel construction is an important part of Korean public construction projects. Although the development of various equipment and technologies has led to advances in tunnel construction methods that are implemented on sites, the cost standards related to such works do not yet reflect the realities of the construction sites. A literature review and site surveys were conducted to suggest reasonable cost standards for tunnel work that reflects the realities of the field. First, each item in the cost standards for tunnel work, as established in the Construction Standard Production Rates, were analyzed. The results were compared with the actual costs implemented on tunnel projects. The key items analyzed included those regarding the work cycle time, such as rock classification, profiling survey, drilling speed, and muck-disposal processing equipment combination, as well as the number of people put to tunneling work. Based on the site survey results, improved estimates regarding the cycle time per one tunnel drilling blast, drilling speed of the machine, muck disposal processing equipment combination, and the number of people put to tunneling work were suggested. This study suggests the cost standards that reflect the realities of tunneling sites. The results are expected to help ensure adequate costs for tunnel construction projects.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.48 no.2
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• pp.86-95
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• 2011

Sensor nodes in wireless sensor networks are vulnerable to security than wired network due to using limited hardware performance and wireless communications that network topology changes frequently. Among techniques to enhance the security, the node authentication mechanism is used to defend against data forgery attacks using the ID of the node or to interfere with the routing of the network routing. In this paper, we proposed the AM-E mechanism that makes authentication key by using the energy value of node requesting authentication and performs the communication procedures for data transfer between different nodes. Because the energy value of node is changed depending on time, every time the authentication request is, an authentication key is changed. These features enhance the security of sensor networks and will help to configure the more secure WSN.

• Journal of Korean Society of Transportation
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• v.29 no.3
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• pp.115-122
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• 2011

This paper investigates the accuracy of the vehicle pre-braking speed estimated based upon measured skidding distance. Driver ordinarily takes sudden braking when urgent situation is developed in the front or when the driver is involved in an unexpected situation, and the driver may be inflicted upon an accident depending on the required stopping distance. Among factors influencing the stopping distance of vehicle such as recognition response time of driver, performance of vehicle's braking device, and state of road surface etc, pre-braking speed is seemingly the most important influencing factor. Currently, in the investigating section of traffic accidents, the state of overspeed is determined by the pre-skidding speed calculated based on the length of skid mark. In order to identify the accurate cause of the accident, it is strongly recommended that estimation of pre-braking speed should be estimated taking into account speed reduction during transient time. In this study, we propose a method for estimating more accurate exact speed information of vehicle at the time of traffic accident. The outcomes from this study potentially help better understanding of the characteristics of vehicle for traffic safety in the future.

• Journal of the Korean earth science society
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• v.21 no.2
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• pp.168-173
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• 2000

To investigate the characteristics of tides in the Naju Lake and Youngsan River, we measured the water level at the Naju Lake for one month (from 30 Dec. 1997 to 27 Jan. 1998) and at several points along the Youngsan River. We found that there are predominant waves with periods of semidiurnal and diurnal tides. The amplitudes of M$_2$, S$_2$, O$_1$ and K$_1$ calculated by harmonic analysis are 0.56, 0.39, 0.48,0.43mm, respectively. The tidal ranges along the Youngsan River, which are almost coincident with the tidal variation of Mokpo, are from 4mm to 18mm depending upon the locations and the direction and that of six-hours period in the north-south direction.

• Bulletin of the Korean Space Science Society
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• 1993.10a
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• pp.24-24
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• 1993

1991년 한국에서 열렸던 밀리미터파 및 적외선천문학에 관한 동북아시아지역 Workshop에서의 합의에 근거하여, 장래의 동북아시아천문대와 동북아시아 지역에 있어서의 당면적인 국제협력관계를 만들어가기 위하여, 중국오지에서의 지상관측을 위한 1차 부지탐사를 1993년 9월에 대만, 일본, 중국, 한국의 4개국 합동으로 추진하였다. 천문학은 본래 지극히 국제적인 과학이며, 따라서 국제협력없이는 앞으로 나아가지 않는다. 그러나, 과거의 여러 사정에 의해 현재 정상적인 협력관계에 놓여있지 않는 대만, 일본, 중국, 한국이 동북아시아 제국 공통의 최신의 관측소를 가지고서는 상호간에 밀접하게 천문학연구를 진행해 나가기 위한 하나의 꿈이 곧 동북아시아천문대라고 할 수 있다. 동북아시아천문대는 이 지역에서의 천문학의 공통적인 활동장소를 만들어나가는 것을 지향하고 있다. 즉, 여러 나라의 연구자들끼리 자연적으로 밀접한 교류를 행해 나가는 가운데, 천문학을 발전시켜나가는 센터를 만들고자 하는 것이다. 그러므로 여기서 계획하고 있는 부지탐사는 이러한 꿈을 실현해 나가기 위한 첫걸음이라고 할 수 있다. 현재 가시광, 적외선, 밀리미터파, 서브밀리미터파를 막론하고, 지상관측에 있어서 요구되는 조건은 모두 같다고 하겠다. 날씨가 좋고, 건조하여 수증기양이 적으며, 공기의 흔들림이 적고, 인간의 활동에 지장이 없을 정도의 높이와 교통편이 좋을 것 등을 들 수 있다. 그러므로 이번 1차부지탐사에서는 연간일조시간이 3000시간 이상에 달하는 후보지에 대한 대기의 종합적인 측정을 행하며, 아울러 가능하다면 적절한 장소에 소형의 적외선 및 서브밀리미터파의 망원경을 두는 공동계획을 구체화한다.ofile occurs along north-south direction there are a few peaks in most line profiles, and these indicate that there not multiple velocity components along the line of sight. Distributions of excitation temperah at and column density which were estimated from the excitation calculations show the existence of a small(IxEpc),hot(Tex> SOK) core which contains two tempegatlue peaks at -15" east and north of MDS. The column density of HCaN is (1-3):n1014cm-2. Column density at distant position from MD5 is larger than that in the (:entral region. We have deduced that this hot-core has a mass of 10sR1 which i:s about an order of magnitude larger those obtained by previous studies.previous studies.업순서들의 상관관계를 고려하여 보다 개선된 해를 구하기 위한 연구가 요구된다. 또한, 준비작업비용을 발생시키는 작업장의 작업순서결정에 대해서도 연구를 행하여, 보완작업비용과 준비비용을 고려한 GMMAL 작업순서문제를 해결하기 위한 연구가 수행되어야

• Journal of Korea Water Resources Association
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• v.55 no.3
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• pp.229-243
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• 2022

The effects of monthly meteorological data measured at 11 stations in South Korea on pan coefficient were analyzed to develop the four types of multiple linear regression models for estimating pan coefficients. To evaluate the applicability of developed models, the models were compared with six previous models. Pan coefficients were most affected by air temperature for January, February, March, July, November and December, and by solar radiation for other months. On the whole, for 12 months of the year, the effects of wind speed and relative humidity on pan coefficient were less significant, compared with those of air temperature and solar radiation. For all meteorological stations and months, the model developed by applying 5 independent variables (wind speed, relative humidity, air temperature, ratio of sunshine duration and daylight duration, and solar radiation) for each station was the most effective for evaporation estimation. The model validation results indicate that the multiple linear regression models can be applied to some particular stations and months.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.21 no.2
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• pp.187-202
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• 1976

Experiment were conducted to study the photosynthetic ability of several rice varieties and the influence of the drymatter production on the yield components of the rice plant, especially in ripening period. The photosynthetic ability at the ripening period, the varieties were classified into two groups as relatively high capacity and low capacity. With the earlier the transplanting date and the higher the N-content leaf blade, the greater the ratio of reserved assimilates befere heading time to the ear. This could be support the fact that the rate of full-ripened grains or grain yield of 'Tongil' variety may increased by the change of environment condition.condition.