갯벌어로의 특징과 지식체계의 범주

김준 남도민속학회 2022 남도민속연구 Vol.45 No.-

Korea’s “Gaetbeol,” or tidal flats, was officially designated as a UNESCO world heritage site in 2021, and “tidal flat harvesting” was declared National Intangible Cultural Heritage. The former represents a global recognition of the value of gaetbeol as a national heritage while the latter shows the state’s acknowledgment of the long-standing experience and knowledge of the fishermen, who relied on tidal flats for their livelihood, as a type of cultural heritage. Gaetbeol Eoro, or tidal flat harvesting, has been providing a livelihood for fishermen living along the west and south coasts and an economic foundation for the fishing community until the present time. Tidal flat harvesting is the process of collecting fish, shellfish, and algae using tools made based on the traditional knowledge accumulated by generations of fishermen while adapting to the tidal flat (sea) and developing a system of diverse knowledge to maintain these materials as sustainable resources. Tidal flat harvesting, as an intangible asset, can be viewed from the categories of humanity, space, and time. The way they are combined determines the cultural layers of the tidal flat harvesting. Tidal flat harvesting cultures can be divided by such cultural layers. This study aims to examine the related categories and elements. From the perspective of the relationship between tidal flat harvesting, humans, villages, fishing village fraternities, traditional knowledge, fishing gear and methods, faith, and food will be examined, as well as “return-to-farming/fishing villages,” which have recently been debated. While tidal flats are natural resources, tidal flat harvesting has been reorganized as a culture where nature and humans interact with each other. Tidal flat harvesting differs depending on the type of tidal flat including mud flats, sand flats, or mixed flats. Even when catching the same fish in the same type of tidal flats, the shape or usage of the fishing gear may differ. In the relationship between tidal flat harvesting and space, “water depth,” the vertical space that appears when the tide comes in, should be examined in addition to the horizontal space. In other words, new habitats are formed in the tidal flats. Some organisms are active when the tide goes out while others forage for food when the tide comes in. In addition, some marine organisms live in tidal flats; not only the depth of the water but also the speed of the tidal flats must be considered. The habitats vary not only according to the area of the activity of the organisms but also according to the method and scope of fishing activities. Furthermore, tidal flats may disappear or change in nature due to development, resulting in the traditional knowledge surrounding harvesting and fishing, long handed down by fishermen, and related culture such as tools and food, also disappearing or becoming damaged. Finally, it is necessary to consider the category of tidal flat harvesting and time. In tidal flat harvesting, this is the category in which researchers are most interested as well as an area of interest in folklore studies. Fishermen remember and express the time of tidal flat harvesting as “multtae,” or tide times. Multtae is a tidal phenomenon caused by the moon orbiting the earth resulting in high and low tides occurring twice a day with daily variances. Accordingly, the area of the tidal flats that is exposed as the tide goes out varies, and the organisms living there differ. Multtae is repeated twice a month with a cycle of 15 days following the rising and falling of the moon, and the tide levels vary depending on the region. The best times and methods for fishing vary depending on the times, which affects the daily lives of the villagers and the operation of the village. With the advancement of science and technology, fishing operation increasingly depends on fish finders and GPS rather than on experience or handed-down knowledge. These changes may be effec...

Effect of Harvest Time on Seed Quality of Silage Corn Inbreds and Hybrids

Lee, Suk-Soon,Yun, Sang-Hee,Soo, Jung-Moon,Min, Hwang-Kee,Ryu, Si-Hwan,Park, Jong-Yeol The Korean Society of Crop Science 2002 Korean journal of crop science Vol.47 No.5

In order to determine the optimum harvest time for the seed production of inbreds and hybrids in silage corn, the ears of sib-pollinated 'KS5', 'KS7rhm', and 'Ga209' and cross-pollinated 'KS5' $\times$ 'KS6' (Suwon19), 'KS7 rhm' $\times$ 'KSl17' (Suwonok), and 'Ga209' $\times$ 'DB544'(Kwanganok) were harvested at the one-week intervals from 4 to 10 weeks after silking. The optimum harvest time for the seed production for 'KS5', 'KS5' $\times$ 'KS6', 'KS7 rhm', and 'KS7rhm' $\times$ 'KS117' was 7 weeks after silking considering both emergence rate and plumule growth in cold test. Although earlier harvested seeds showed similar germination rate as the seeds harvested at the optimum time at $25^{\circ}C$, their emergence rate were lower in cold test. Seed weight and $\alpha$-amylase activity of earlier harvested seeds were lower compared to those of seeds harvested at the optimum time, while leakage of total sugars and electrolytes were higher. However, the later harvested seeds showed lower germination rates at $25^{\circ}C$ and emergence rates in cold test probably due to the lower $\alpha$-amylase activity although they showed increased seed weight and reduced leakage of total sugars and electrolytes. In contrast, the emergence rate of 'Ga209' and 'Ga209' $\times$ 'DB544' in cold test increased up to 10 weeks after silking probably due to the increased seed weight and $\alpha$-amylase activity and reduced sugar and electrolyte leakages during the germination. The cross-pollinated F$_1$ hybrid seeds showed higher germination and emergence rates at $25^{\circ}C$ and in cold test, and higher plumule growth and $\alpha$-amylase activity compared to those of sib-pollinated inbreds.

종실용 들깨의 기계수확에 적합한 최적 파종시기 설정

곽강수,한원영,류종수,배진우,박진기,백인열 한국국제농업개발학회 2018 韓國國際農業開發學會誌 Vol.30 No.4

In order to promote the mechanized cultivation of perilla for seed, which has been increasing in cultivation area and production recently as demand increases according to the health-functional effects, we carried out this experiment to determine the optimum sowing time of perilla to minimize the seed loss at harvest and increase the yield. We used two different types of perilla varieties, ‘Sodam(smallbranch)’ and ‘Deulsaem(multi-branch)’, and the sowing time was June 15, June 30, July 15 and August 1. As the sowing time is late, days of growth from sowing to flowering were shortened, and they were shortened from 14, 26 and 31~32 days on June 30, July 15 and August 1 as compared with June 15, respectively. And, the stem length and culm diameter were shortened or tapered and the number of nodes tended to decrease. The number of effective branch was 82%, 61% and 56% on June 30, July 15 and August 1 as compared with June 15, respectively. Accordingly, it seems to make against in securing the yield from July 15. And, the lowest cluster height was generally shorter as the sowing time is late, and the height was below 15cm on July 15 and August 1. It seems that this may work against the machine harvest. There was a high degree of significance between the sowing time and the yield. Although, the total yield was not statistically significant among June 15, June 30 and July 15, the ratio of shattering seed at harvest was in order of July 15, August 1(30.3%)> June 15(15.3%)> June 30(13.5%). Therefore, the net yield except for shattered seed was higher in order of June 30≥ June 15> July 15> August 1. This tendency was characteristic regardless of variety and sowing method. And, the protein content in perilla seed increased as the sowing time was delayed, and the content was the highest on August 1. The content of crude fat was relatively high on June 15 and July 15 in ‘Sodam’, and June 30 and July 15 in ‘Deulsaem’, respectively. And, the content of linolenic acid was found to be the highest on August 1. As a result, the optimal sowing time for machine harvest of perilla for seed is about June 30. At this time, it is determined that the sowing time is the most suitable to be advantageous in increasing the yield of perilla seed, while minimizing the seed loss due to the shattering at harvest. 본 연구는 근래에 건강 기능성효과가 널리 알려지면서 수요 가 증가함에 따라 재배면적과 생산량이 증가하고 있는 종실용 들깨의 기계화재배를 촉진하기 위하여 수확 때 종자탈립에 의 한 손실률은 최소화하고 수량성을 높일 수 있는 최적 파종시 기를 설정하고자 수행하였다. 1. 파종기가 늦어질수록 파종후 개화기까지 생육일수는 짧 아져 6월 15일 파종대비 6월 30일, 7월 15일 및 8월 1일 파 종에서 각각 14일, 26일 및 31~32일 짧아졌으며, 또한 경장과 경태는 짧아지거나 가늘어졌으며 마디수가 적어지는 경향을 나타냈다. 2. 유효분지수는 6월 15일 파종대비 6월 30일, 7월 15일 및 8월 1일 파종에서 각각 82%, 61% 및 56%로 7월 15일 파종부터 급격히 낮아져 수량성 확보에 불리한 것으로 판단되 었다. 그리고 최저화방군의 높이는 파종기가 늦어질수록 대체 로 짧아지는데, 소담의 7월 15일과 8월 1일 점파구의 경우 15 cm 이하로 예취기를 이용한 기계수확에 불리하게 작용할 것으로 판단되었다. 3. 파종기와 수량성 간에는 고도의 유의성이 인정되었는데, 총수량은 6월 15일, 6월 30일 및 7월 15일 파종에서 통계적 유의차는 없었지만, 종실탈립률의 경우 7월 15일, 8월 1일 (30.3%)>6월 15일(15.3%)>6월 30일(13.5%) 파종의 순이었는 데, 탈립된 종실을 제외한 순수량은 6월 30일 6월 15일 >7월 15일 >8월 1일 파종 순으로 높게 나타났으며 이러한 경향은 품 종 및 파종방법에 관계없이 나타나는 일반적인 특징이었다. 4. 들깨 종실의 단백질 함유율은 파종기가 늦어질수록 대체 로 증가하여 8월 1일 파종에서 가장 높았으며, 조지방 함유율 의 경우 소담은 6월 15일과 7월 15일 파종에서, 들샘은 6월 30일과 7월 15일 파종에서 비교적 높았으며, 리놀렌산의 함량 율은 8월 1일 파종에서 특이적으로 높은 수준을 나타냈다. 5. 위의 결과, 종실용 들깨의 예취기를 이용한 기계수확을 위한 최적 파종시기는 6월 30일 경으로 이때 파종하면 수확 때 종실탈립에 의한 손실률은 최소화하면서 수량증대에 유리 하여 기계수확에 가장 적합한 파종시기로 판단되었다.

남부지방에서 조생종 콩 품종의 특성과 조기수확 한계기

김동관,손동모,천상욱,이경동,김경호 한국작물학회 2008 한국작물학회지 Vol.53 No.2

본 연구는 주요 조생종 콩의 생육과 종실품질 및 수량을 비교하여 남부지방 다모작 재배농가의 조생종 콩 품종선택에 활용하고자 전남 나주(위도 35º04'N, 경도 126º54'E)에서 6월 15일에 파종하여 수행하였다. 큰올콩과 화성풋콩은 성숙기가 9월 12일로 빨라 작부체계 도입에 유리할 뿐만 아니라 종실품질과 수량이 양호하였다. 그리고 새올콩과 신록콩은 성숙기가 9월 20일 전.후로 조금 늦으나 종실품질이 좋고 수량이 많았다. 따라서 콩 후작물을 9월 중순에 파종하고자 할 때는 큰올콩과 화성풋콩이, 9월 하순에 파종하고자 할 때는 새올콩과 신록콩이 유리하였다. 그리고 주요 조생종 콩의 조기수확에 따른 종실품질과 수량성 등을 검토하여 조기수확 한계기를 구명하고자 수행하였다. 큰올콩은 수확적기(9월 12일)보다 6일전(9월 6일)에 수확할 때 입중, 수량, 종실품질 등이 적기수확과 차이가 없었다. 한편 새올콩은 수확적기(9월 24일)보다 6일전(9월 18일)에 수확할 때 입중, 수량, 종실품질 등이 적기수확과 차이가 없다. 따라서 큰올콩과 새올콩의 안정적인 조기수확 한계기는 수확적기 6일 전이다. This study analyzed the growth, seed quality, and yield of major early-maturing soybean cultivars by comparing them in order to utilize the research results in the selection of early-maturing soybean cultivars in multi-cropping farms in the Southern area. This field trial was conducted at Naju region (latitude 35~circ04, longitude 126~circ54), Jeonnam, with planting on June 15. The maturing date for Keunol-kong and Hwaseong-put-kong was found to be around September 12, which was earlier than other cultivars. Thus, there were advantages to introducing a cropping system as well as having good seed quality and high yield. On the other hand, the maturing date for Saeol-kong and Sinrok-kong was found to be around September 20, which was a little bit late; however, the seed quality of the cultivars was good and they had a high yield. Therefore, if we want to sow the following crops of soybeans around mid-September, Keunol-kong and Hwaseong-put-kong are advantageous, while for the seeding around late September, Saeol-kong and Sinrok-kong would be good. This study was also performed to identify the limitation time for early harvesting by reviewing seed quality and yield of major early-maturing soybean cultivars according to early harvesting. When harvesting Keunol-kong on September 6, which was six days earlier than the optimal harvesting time (September 12), there was no difference in seed weight, yield, or seed quality than those of the harvested at the optimum maturing time. As for Saeol-kong, when harvesting on September 18, which was six days earlier than the optimal harvesting time (September 24), there was no difference in seed weight, yield, or seed quality than those of the harvested at the optimum maturing time. Therefore, the stable limitation time for early harvesting of Keunol-kong and Saeol-kong was concluded to be six days earlier than the optimal harvesting time.

잇꽃 수확시기(收穫時期)에 따른 홍화(紅花) 및 종실(種實) 수량(收量)

최병열,박경열,강창성 한국약용작물학회 1997 한국약용작물학회지 Vol.5 No.3

잇꽃 재배시 홍화수확적기 및 이에 따른 종실 (홍화자) 수확적기를 구명하고자 홍화를 개화성기 후 2, 4, 6일, 종설을 개화 성기후 10, 15, 20, 25일에 수확하여 시험한 결과를 요약하면 다음과 같다. 1. 건홍화의 수확적기는 개화후 4일로 수량은 개화 후 2일(28.1kg/10a)에 비하여 유의차가 없었고 색채색차 (δEab) 로 본 품질도 개화 후 6일에 비하여 1.07로 차이가 작았던 개화 후 4일로 판단되었다. 2. 홍화의 수확유무 및 수확시기에 따른 종실수량은 유의차가 인정되지 않았다. 3. 수확시기에 따른 ha당 종실수량은 개화성기 후 10일 수확 284.8kg에 비하여 수확이 늦추어짐에 따라 백립중이 증가하여 20일 수확시 17%, 25일 수확은 8% 증수되어 홍화의 종실수확적기는 개화후 20일 전후로 판단되었다. This experiment was conducted to determinate the optimum harvesting time of Carthami Flos and grain in safflower. In dry Carthami Flos yields harvested at different days after flowering, threre was no significant difference between 2 days and 4 days, however, yield harvested at 6 days was decreased significantly compared with 2 days after flowering. As the harvesting time were delayed, lightness (L') and redness (a') of dry Carthami Flos were decreased but yellowness (b') of that was increased. Color differences (δE'ab) of dry Carthami Flos between harvesting days after flowering were not visible between 4 days and 6 days but between those (4 days and 6 days) and 2 days were visible. As the result, the optimum harvesting time of Carthami Flos was 4 days after flowering. Grain yields and its components were affected by not harvesting Carthami Flos but grain harvesting time. Threre was no significant difference in number of grain per flower head, percentage of ripened grain between grain harvesting time. However, weight of 1000 grains and grain yields increased until 20 days after flowering. As a conclusion, the optimum harvesting time was 4 days after flowering for Carthami Flos and 20 days for grain regardless Carthami Flos harvesting time.

수확시기에 따른 초당옥수수의 부위별 영양학적 특성

유지현,조연재,이기탁,이창호,소윤섭,이준수,정헌상 한국식품영양과학회 2023 한국식품영양과학회지 Vol.52 No.3

This study investigates the nutritional characteristics of sweet corn kernels, silks, and cobs according to the harvest time. Our results will help to identify the most suitable harvest time for super sweet corn and provide basic data for processing. We observed increased levels of dietary fiber with increasing harvest time; the highest value of 17.84% was obtained in cobs harvested after the proposed suitable time. Total essential free amino acids were the highest at 2,624.45 mg/100 g in silks harvested before the suitable time and decreased with increasing harvest time. The total starch content was determined to increase with increasing harvest time (range, 4.41∼24.11%). Highest total free sugar content (46.03%) was obtained in kernels harvested before the suitable time, and the levels were observed to decrease with increasing harvest time. The fatty acid composition showed a high composition ratio of linoleic acid in all plant parts, with contents ranging from 44.52 to 46.55%, 35.91 to 37.43%, and 46.09 to 49.15% in kernels, silks, and cobs, respectively. We conclude that the nutritional characteristics differ depending on the harvest time and plant part. We believe that data from this study will help determine the harvest time according to the purpose of use. 본 연구에서는 초당옥수수의 수확시기를 결정하고 가공을 위한 기초자료를 확보하기 위하여 수확시기별 알곡, 수염 및 속대에 대한 영양학적 특성을 살펴보았다. 식이섬유 함량은 수확시기가 지남에 따라 증가하였고, 후기 속대에서 17.84%로 가장 높았다. 총 필수 유리아미노산은 전기 수염이 2,624.45 mg/100 g으로 가장 높았으며, 수확시기가 늦어질수록 감소하였다. 총 전분 함량은 수확시기에 따라 14.41~24.11% 범위로 증가하였다. 총 유리당 함량은 전기 알곡에서 46.03%로 가장 높았으며, 수확시기가 늦어질수록 감소하였다. 지방산 조성은 모든 부위에서 linoleic acid의 조성비가 높았고 수확시기별로 알곡, 수염 및 속대에서 각각 44.52~46.55%, 35.91~37.43% 및 46.09~49.15% 범위였다. 이상의 결과를 종합해보면 수확시기 및 부위별 영양학적 특성이 다르게 나타나므로 사용 목적에 따라 수확시기를 결정하기 위한 자료로 활용될 수 있을 것으로 판단된다.

영남산간지역에서 옥수수와 수수×수수 교잡종의 파종시기와 수확시기가 조사료 생육 특성과 사료가치에 미치는 영향

이혁준,주영호,이성신,한옥규,구자환,민형규,오정식,김삼철,Lee, Hyuk-Jun,Joo, Young-Ho,Lee, Seong-Shin,Paradipta, Dimas Hand Vidya,Han, Ouk-Kyu,Ku, Ja-Hwan,Min, Hyeong-Gyu,Oh, Jung-Sik,Kim, Sam-Churl 한국초지조사료학회 2019 한국초지조사료학회지 Vol.39 No.2

본 연구는 영남산간지역에서 옥수수와 수수${\times}$수수 교잡종의 파종시기와 수확시기를 구명하고자 2015년부터 2016년까지 수행하였다. 옥수수는 국내 육성품종인 광평옥을 5월 8일, 19일 및 27일에 파종하였고 8월 10일, 20일 및 30일에 수확하였다. 수수${\times}$수수 교잡종은 수입품종인 SS405를 5월 27일, 6월 6일과 16일에 파종하였고 8월 10일, 20일 및 30일에 수확하였다. 옥수수의 생산성 측면에서는 파종시기가 빠를수록 간장, 생엽수, 이삭비율, 생초수량 및 건물수량이 증가하였으며, 수확시기가 빠를수록 건물수량은 감소하였다. 사료가치 측면에서는 파종시기가 빠를수록 건물과 조단백질 함량은 증가하였고, 수확시기가 빠를수록 NDF와 ADF 함량은 감소하였다. 수수${\times}$수수 교잡종의 생산성 측면에서는 파종시기가 빠를수록 초장, 생초수량 및 건물수량은 증가한 반면, 수확시기가 빠를수록 초장, 생초수량 및 건물수량은 감소하였다. 사료가치 측면에서는 파종시기가 빠를수록 건물 함량은 증가하였으나, NDF 함량은 감소하였다. 조단백질 함량은 수확시기가 빠를수록 증가하였다. 이상의 결과에서 영남산간지역에서 여름사료작물로 옥수수와 수수${\times}$수수 교잡종을 생산할 경우 6월 초순 이전까지는 파종하여 8월 중순 이후에 수확하는 것이 조사료 생산성과 사료가치의 향상에 유리할 것으로 판단되었다. This study was carried out from 2015 to 2016 to identify the suitable sowing and harvesting dates of summer crops in the mountain of Yeongnam, South Korea. The experimental design consisted of the different sowing and harvesting dates as follows: corn hybrid (Z. mays, Kwangpyeongok) of sowing (May 8, 19, and 27) and harvesting (August 10, 20, and 30); sorghum${\times}$sorghum hybrid (Sorghum bicolor ${\times}$ Sorghum bicolor, SS405) of sowing (May 27, June 19 and June 27) and harvesting (August 10, 20, and 30). In corn hybrid, ear rate and dry matter (DM) yield decreased (p<0.05) with the postponement of sowing date. Otherwise, ear rate and DM yield increased (p<0.05) with the postponement of harvesting date. Crude protein content decreased (p<0.05) with the postponement of sowing date, but neutral detergent fiber content increased (p<0.05). In sorghum${\times}$sorghum hybrid, plant length and DM yield with the postponement of harvesting date increased (p<0.05), while crude protein content with the postponement of harvesting date decreased (p<0.05). This study concluded that sowing corn hybrid in early May and sorghum${\times}$sorghum hybrid in early June then harvest in the middle of August was recommend to increase dry matter yield and feed value.

Variations in Proximate Nutrients, Phytochemicals,and Antioxidant Activity of Field-cultivated Red Pepper Fruits at Different Harvest Times

Shiva Ram Bhandari,Usha Bashyal,이영상 한국원예학회 2016 Horticulture, Environment, and Biotechnology Vol.57 No.5

Red pepper (Capsicum annuum L.), an important horticultural crop, is typically harvested several times within one season. The goal of this study was to elucidate the harvest time-dependent variation and accumulation patternsof phytochemicals and any associated antioxidant activity in red pepper. Fully matured red pepper fruits, grown in an open field, were harvested six times during the season. They were evaluated for their proximate nutrient contents,as well as their minerals, vitamins, capsaicinoids, total flavonoid, total phenols, squalene, phytosterols, and fatty acids, and for antioxidant activity. The content of most phytochemicals varied significantly at different times of harvest. Phytochemicals such as capsaicinoids, vitamin C, total phenols, total flavonoid, β-carotene, and calcium, as well as antioxidant activity, had higher values in the initial and final harvests, while P, K, and Na decreased continuously with the progression of the harvest season. Squalene content increased continuously, while vitamin E and phytosterol contents were relatively stable throughout the harvest season. Different phytonutrients exhibited different levels of harvesting time-dependent variation; capsaicinoid had the highest coefficient of variation (CV, 55.44%), followed by squalene (40.51%), total flavonoids (15.97%), and vitamin C (10.57%). Total vitamin E, phytosterols, fatty acids, and the proximate nutrients were relatively constant, with low CVs (<10.0%). Among the phytonutrients, total flavonoids (r = 0.841), vitamin C (r = 0.801), β-carotene (r = 0.738), and total phenol (r = 0.705) were highly positively correlated with antioxidant activity throughout the harvesting season. These results suggest that the content of phytochemicals, and their associated health benefits, may be affected by red pepper harvest time throughout the harvest season.

Time-Power 제어를 이용한 드론의 효율적 데이터 전송 및 에너지 하비스팅 기법

홍승관,차경현,이선의,황유민,김진영 한국위성정보통신학회 2015 한국위성정보통신학회논문지 Vol.10 No.4

본 연구는 LTE, 5G의 무선 통신네트워크망에서 효율적으로 무선에너지하비스팅과 데이터 전송 실시하기 위한 시스템 모델을 제시 한다. 수신 된 신호의 파워를 타임 스위칭(Time Switching)과 파워 스플릿팅(Power Splitting) 기법을 통해 우리가 원하는 무선에너 지하비스팅 효율과 데이터 전송률을 만족시키기 위한최적의 타암 & 파워 비율을 찾는다. 그래서 최적의 시간 & 파워 비율을 선정함 으로써 우리는 효율적으로 데이터 전송과 에너지하비스팅이 가능하다. 또 이상적인 수신기와 제안한 시스템 모델의 비교를 통해 성능 분석을 실시하고, 앞으로의 연구방향을 제시한다. In this paper, we propose a system model which effectively transmits the data and conducts RF energy harvesting in a wireless communication network of LTE and 5G. Through time switching and power splitting schemes, we find a time & power ratio to show the good performance according to the standard that we set up for transmitting a signal and conducting RF energy harvesting. So selecting optimal time & power ratio, we can efficiently transfer data to other drones and harvest the amount of harvested power simultaneously we desire. Also, according to conducting the performance analysis, we can compare an ideal receiver with the proposed system model. And, we suggest a future direction of research.

무선 인지 중계 네트워크에서 이차 사용자의 중계기가 에너지 하베스팅을 사용할 때 처리량을 최대화하기 위한 최적의 하베스팅 시간 분배 방법

임경래(Gyeongrae Im),이재홍(Hong Lee) 한국방송·미디어공학회 2015 방송공학회논문지 Vol.20 No.2

Energy harvesting technique is an energy charging technique for communication device in energy-constrained environment. Recently, energy harvesting technique that harvests energy from wireless radio frequency signal is proposed. Representatively, there are time switching technique and power splitting technique. This paper proposes an optimal harvesting time allocation scheme in a wireless cognitive relay network when secondary user relay uses energy harvesting technique to transmit information. Secondary user relay receives information and energy simultaneously from the secondary user source’s signal via time switching technique. We aim to maximize the instantaneous throughput by optimizing harvesting time of the secondary user relay. Simulation results show that using optimized harvesting time gets larger instantaneous throughput compared to using constant harvesting time.