石灰 및 苦土가 土壤內 有效成分變化와 水稻生育에 미치는 影響

崔元凱,文泰萬,河浩成,朴愚喆 진주농과대학 1968 진주농과대학 연구논문집 Vol.- No.7

pH 5.5의 耕作土壤에 石灰를 1-6me/100gr까지 增加시켜 土壤內 成分과 水稻生育에 對하여 몇 가지 結果를 얻었으며, 역시 同一土壤에 Mg를 1-4me/100gr 施用하여 몇 가지 結果를 얻었다. (1) Ca當量別 增加에 따라 exch-Ca와 pH의 變化는 比例的으로 增加되어 高度의 相關이 있다. (2) 有效燐酸, 可溶性SiO2, 有機物, 活性鐵, 置換性 苦土等의 含量變化는 認定되지 않았다. (3) 燐酸의 吸收係數는 Ca施用에 따라 正 相關이 認定된다. (4) Ca施用에 따라 生育面에 莖數, 穗數는 減少되어 負相關이 認定된다. (5) 草長, 稈長, 稔實率, 穗當着粒數에는 變化가 認定되지 않는다. (6) Mg를 1-4me/100gr 增加施用에 따라 土壤內 exch-Mg와 有效燐酸은 增加되었다. (7) pH 및 基他成分은 變化가 나타나지 않았다. (8) Mg施用에 따라 生育은 草長, 莖數는 增加가 없었고 穗數와 稈長이 增加된 傾向이고 基他는 變化가 없다. Some results of rice growth and available element in soil were obtained by application 1-6me/100gr of calcium and 1-4me/100gr of magnessium in a soil which was pH 5.5. The results of the study showed the followings. 1. Increasing the application of calcium, exch-Ca, pH and absorption coefficient of phosphorus were increased proportionally, but available ??, soluble SiO₂, O.M., active Fe and exch-Mg were not changed. 2. Number of Penicles and tillers were decreased proportionally but plant height, the length of culm, rate of grain formation and number of grain per penicle were not changed. 3. Increasing the application of magnessium, exch-Mg and available ?? were increased but the others were not changed. 4. Plant height and number of penicles were not increased but the number of tillers and the length of culm had tendency to increase.

製絲時(韓國,中國産고치)의 界面活性劑(Monopol LX, Emulon DO#113) 處理가 製絲成績에 미치는 影響

최진섭,裵啓宣,鄭元福,金東建 東亞大學校生命資源科學大學附設 農業資源硏究所 1992 農業生命資援硏究 Vol.1 No.1

본 實驗은 界面活性劑인 Monopol LX와 Emulon DO #113을 0.04%, 0.07%, 0.1%로 稀釋하여 煮菌時의 低溫渗透部 단독 處理區와 低溫渗透部 및 繰絲湯의 동시 處理區로 하여 中國産고치와 韓國産고치의 繰絲成績 및 絲質을 調査 分析한 結果는 다음과 같다. 1. 解舒率은 韓國産, 中國産 모두 無處理區에 비해 Monopol LX 와 Emulon DO #113을 處理時에 增加하였으며 0.1% 濃度에서 그 경향이 높았다. 2. 解舒絲長은 解舒率과 같은 傾向으로 無處理區보다 Monpol LX와 Emulon DO #113 處理區에서 전반적으로 길어졌는데 특히 中國産고치에서 Monopol LX 0.1% 處理時 高度의 有意差를 보였다. 3. 菌絲長은 處理別로 다소의 增感은 있었으나 無處理區와 거의 비슷한 傾向을 나타내었다. 4. 菌絲量은 Monopol LX와 Emulon DO #113약제 처리시에 감소하는 경향을 나타내었다. 5. 生絲量比率은 無處理區에 비해 減少하는 경향을 나타내었다. 6. 副蠶絲量은 界面活性劑 處理의 結果 그 양이 減少되었으며 특히 韓國産 누에고치에서 0.07%, 0.1%의 Emulon do#113 渗透部 및 繰絲湯 處理區에서 5%의 有意差를 보였다. 7. 解舒率이 높을수록 無處理區에서는 强力은 負의 相關을 解舒絲長, 繭絲長, 繭絲量, 生絲量比率, 伸度등에서는 正의 상관을 나타내었고, Monopol LX 0.1% 處理區는 副蠶絲量에서, 그리고 Emulon Do#113 0.1% 處理區에서는 副蠶絲量, 繭絲織度, 伸度 등에서 負의 相關을 나타내었다. 8. 한국산 고치에 비해 중국산 고치는 고치의 크기가 작고, 解舒率, 解舒絲長, 繭絲長, 繭絲量, 生絲量比率, 伸度등의 成績이 떨어졌으며, 副蠶絲量이 많은 편이었다. This experiment was carried out to investigate the reeling silk results and silk quality of Korean cocoon and Chinese cocoon which were experimented on the following condition that Monopol LX & Emulon DO #113(penetrating agents) were 0.04%, 0.07%, 0.1% under only low temperature osmose treatment and simultaneous treatment of low temperature osomose & reeling bath in cocoon cooking, and the results obtained were as follows; 1. The percentage of reliability increased in the treatment of Monopol LX, Emulon DO #113 as compared with control in both Korean cocoon & Chinese cocoon exhibited a high tendency in 0.1% concentration to the extent to show a significant difference. 2. The nonbreaking length of a bave was totally longer in the treatment of Monopol LX, Emulon DO #113 than control as in the percentage of rawsilk, especially, showed a highly significance in the treatment of Monopol LX 0.1% of Chinese cocoon. 3. The length of a bave showed almost similar tendency to control with more or less increase and decrease according to the treatments. 4. Decreasing tendency was revealed in treating Monopol LX and Emulon DO #113 on the terms of the bave weight. 5. On the terms of the percentage of rawsilk, decreasing tendency was appeared in treating plots as compared with control. 6. The weight of byproduct was decreased by treating the penetrating agents especially on Korean cocoon, the statistically significant differences of 5% were revealed in treating the osomose and reeling both of Emulon DO #113 concentrated with 0.07% and 0.1%. 7. Negative correlation in tenacity was appeared in control as increasing the percentage of rawsilk, and positive correlation in the nonbreaking length, length of a bave weight, percentage of reliability, and elongation was convinced and also negative correlation was revealed in weight of byproduct treated with Monopol LX(0.1%) and in weight of by product, size of bave, and elongation treated with Emulon DO #113(0.1%), 8. The percentage of rawsilk, nonbreaking length of a bave, percentage of reliability, weight of a bave, size of a bave and elongation of Chinese cocoon were all lower than those of Korean cocoon, and on the hand, the weight of byproduct was more.

Implementation and Experiment on Multi-Antenna Wireless-Powered Sensor Networks

Kae Won Choi(최계원),Lorenz Ginting,Phisca Aditya Rosyady,Arif Abdul Aziz,Dong In Kim(김동인) 한국통신학회 2016 한국통신학회 학술대회논문집 Vol.2016 No.6

Sequential detection of cyclostationary signal for cognitive radio systems

Kae Won Choi,Wha Sook Jeon,Dong Geun Jeong IEEE 2009 IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS Vol.8 No.9

<P>The cyclostationary feature detector is a viable candidate for a primary user (PU) detection method of the cognitive radio (CR) system. However, it requires very long detection time, which leads to inefficient spectrum utilization. To reduce the detection time, we propose to apply the sequential detection framework to the cyclostationary feature detector. Unfortunately, a straightforward application cannot achieve a sufficient gain, which is expected with the sequential detection. To solve this problem, we design a novel detector, taking account of the cyclic phase of the cyclostationary signal. The simulation results show that the proposed detector reduces the average detection time almost in half. The proposed detector can well be applied to the CR systems that operate in the frequency bands, where the PUs have long interarrival and sojourn time. For example, the CR systems equipped with the proposed detector can efficiently exploit the white space in the VHF/UHF TV bands.</P>

Distributed Wireless Power Transfer System for Internet of Things Devices

Choi, Kae Won,Aziz, Arif Abdul,Setiawan, Dedi,Tran, Nguyen Minh,Ginting, Lorenz,Kim, Dong In IEEE 2018 IEEE Internet of things journal Vol.5 No.4

<P>The wireless power transfer via an electro-magnetic (EM) wave enables far-field power transfer for supplying power to Internet of Things (IoT) devices. However, the power attenuation of the EM wave leads to low end-to-end power transfer efficiency. In this paper, we provide an analytic and experimental study on the distributed wireless power transfer system as a means to overcome the low power transfer efficiency. In the distributed wireless power transfer system, a number of multiantenna power beacons, which are distributed over space, send out wireless power to charge IoT devices. Since each power beacon has a separate local oscillator and controller, it is very challenging to achieve frequency and phase synchronization among power beacons, which is the prerequisite for optimal distributed beamforming. In this paper, we study the performance of the distributed wireless power transfer system with or without the frequency and phase synchronization. Based on the experiment and simulation results, we show that the distributed wireless charging is advantageous in terms of the coverage probability as long as the optimal distributed beamforming is available in the distributed wireless power transfer system.</P>

An Experimental Study on Distributed Wireless Power Transfer System

Kae Won Choi,Lorenz Ginting,Dedi Setiawan,Dong In Kim 한국통신학회 2017 한국통신학회 학술대회논문집 Vol.2017 No.6

Resource Allocation in OFDMA Wireless Communications Systems Supporting Multimedia Services

Kae Won Choi,Wha Sook Jeon,Dong Geun Jeong IEEE 2009 IEEE/ACM transactions on networking Vol.17 No.3

<P>We design a resource allocation algorithm for downlink of orthogonal frequency division multiple access (OFDMA) systems supporting real-time (RT) and best-effort (BE) services simultaneously over a time-varying wireless channel. The proposed algorithm aims at maximizing system throughput while satisfying quality of service (QoS) requirements of the RT and BE services. We take two kinds of QoS requirements into account. One is the required average transmission rate for both RT and BE services. The other is the tolerable average absolute deviation of transmission rate (AADTR) just for the RT services, which is used to control the fluctuation in transmission rates and to limit the RT packet delay to a moderate level. We formulate the optimization problem representing the resource allocation under consideration and solve it by using the dual optimization technique and the projection stochastic subgradient method. Simulation results show that the proposed algorithm well meets the QoS requirements with the high throughput and outperforms the modified largest weighted delay first (M-LWDF) algorithm that supports similar QoS requirements.</P>

Efficient Load-Aware Routing Scheme for Wireless Mesh Networks

Kae Won Choi,Wha Sook Jeon,Dong Geun Jeong IEEE 2010 IEEE TRANSACTIONS ON MOBILE COMPUTING Vol.9 No.9

<P>This paper proposes a load-aware routing scheme for wireless mesh networks (WMNs). In a WMN, the traffic load tends to be unevenly distributed over the network. In this situation, the load-aware routing scheme can balance the load, and consequently, enhance the overall network capacity. We design a routing scheme which maximizes the utility, i.e., the degree of user satisfaction, by using the dual decomposition method. The structure of this method makes it possible to implement the proposed routing scheme in a fully distributed way. With the proposed scheme, a WMN is divided into multiple clusters for load control. A cluster head estimates traffic load in its cluster. As the estimated load gets higher, the cluster head increases the routing metrics of the routes passing through the cluster. Based on the routing metrics, user traffic takes a detour to avoid overloaded areas, and as a result, the WMN achieves global load balancing. We present the numerical results showing that the proposed scheme effectively balances the traffic load and outperforms the routing algorithm using the expected transmission time (ETT) as a routing metric.</P>

Downlink Subchannel and Power Allocation in Multi-Cell OFDMA Cognitive Radio Networks

Kae Won Choi,Hossain, E.,Dong In Kim IEEE 2011 IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS Vol.10 No.7

<P>We propose a novel subchannel and transmission power allocation scheme for multi-cell orthogonal frequency-division multiple access (OFDMA) networks with cognitive radio (CR) functionality. The multi-cell CR-OFDMA network not only has to control the interference to the primary users (PUs) but also has to coordinate inter-cell interference in itself. The proposed scheme allocates the subchannels to the cells in a way to maximize the system capacity, while at the same time limiting the transmission power on the subchannels on which the PUs are active. We formulate this joint subchannel and transmission power allocation problem as an optimization problem. To efficiently solve the problem, we divide it into multiple subproblems by using the dual decomposition method, and present the algorithms to solve these subproblems. The resulting scheme efficiently allocates the subchannels and the transmission power in a distributed way. The simulation results show that the proposed scheme provides significant improvement over the traditional fixed subchannel allocation scheme in terms of system throughput.</P>

Cooperative Spectrum Sensing Under a Random Geometric Primary User Network Model

Kae Won Choi,Hossain, E,Dong In Kim IEEE 2011 IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS Vol.10 No.6

<P>We propose a novel cooperative spectrum sensing algorithm for a cognitive radio (CR) network to detect a primary user (PU) network that exhibits some degree of randomness in topology (e.g., due to mobility). We model the PU network as a random geometric network that can better describe small-scale mobile PUs. Based on this model, we formulate the random PU network detection problem in which the CR network detects the presence of a PU receiver within a given detection area. To address this problem, we propose a location-aware cooperative sensing algorithm that linearly combines multiple sensing results from secondary users (SUs) according to their geographical locations. In particular, we invoke the Fisher linear discriminant analysis to determine the linear coefficients for combining the sensing results. The simulation results show that the proposed sensing algorithm yields comparable performance to the optimal maximum likelihood (ML) detector and outperforms the existing ones, such as equal coefficient combining, OR-rule-based and AND-rule-based cooperative sensing algorithms, by a very wide margin.</P>