모바일 사전을 위한 효율적인 선인출 기법

홍순정,문양세,김혜숙,김진호,정영준 강원대학교 정보통신연구소 2007 정보통신논문지 Vol.11 No.-

In the mobile Internet environment, we need to perform frequent accesses between a mobile device and a content server for searching or downloading learning materials. In this paper, we propose an efficient prefetching technique to reduce the network cost and to improve the communication efficiency in the mobile dictionary. Contributions of the paper can be summarized as follows. First, we propose an overall framework for the prefetching-based mobile dictionary. Second, we present a method of determining the amount of prefetching data for each of packet-based and flat-rate billing cases. Third, by focusing on the English-Korean mobile dictionary for middle or high school students, we propose a method of determining the words to be prefetched in advance. Fourth, based on these determination methods, we propose an efficient prefetching algorithm. Fifth, through experiments, we show superiority of our prefetching-based method. Experimental results show that, compared with the traditional on-demand method, our prefetching-based method improves the average performance by 9.8%~19.7% for the packet-based billing and by 19.0%~33.2% for the flat-rate billing. These results indicate that our framework can be widely used not only in the mobile dictionary but also in other mobile Internet applications that require the prefetching technique.

벼 담수골표면산파 재배의 파종방법 및 효과

황동용,박성태,김재현,양세준,김성만 한국국제농업개발학회 2002 韓國國際農業開發學會誌 Vol.14 No.4

담수골 표면산파시 안정입모 확보를 위한 파종 골거리와 깊이 및 파종전 후 물 관리 등에 따른 효과 및 주요 결과를 요약하면 다음과 같다. <적정 골거리 및 골깊이 구명> 1. ㎡당 입모수는 128-168개로 골 깊이 및 골거리에 관계없이 충분한 입모수가 확보되었고, 골내 입모율은 골거리 10㎝, 골깊이 8㎝에서 가장 높았고, 골 형성 정도는 골 거리 15㎝, 골 깊이 8㎝에서 비교적 양호하였다. 2. ㎡당수수는 각각 384∼428개로 처리간에는 뚜렷한 경향이 없었고, 수당립수는 76∼88개로 골거리가 깊을수록 적었고, 등숙율은 77.3∼84.6%로 골 거리간에는 차이가 없었으나 골 깊이간에는 깊을수록 높았다. 3. 담수골표면산파시 쌀 수량은 451∼534㎏/10a로 담수표면산파 448/㎏ 대비 1∼19% 증수되었고, 골 거리 15㎝, 골 깊이 8㎝에서 쌀 수량이 가장 높았다. 4. 담수골표면산파는 담수표면산파에 비해 줄기 매몰심이 깊고 포장 도복피해 정도는 골 깊이가 깊을수록 적었고 담수표면산파는 완전도복 되었다. <골형성후 파종상태 구명> 1. 골 형성정도는 양호하였으며, 종자몰림 및 부묘 정도는 거의 없었고, 골 내입모율은 68∼74%로 산파를 하였으나 어느 정도 조파형태로 입모 되었으며, ㎡당 입모수는 123개였음. 2. 줄기매몰심은 1.6∼2.2㎝로 깊게 매몰되었으며, 포장도복은 거의 없었으나 담수표면산파에서는 심한 도복현상을 보였다. 3. ㎡당수수 및 수당립수는 담수표면산파와 비슷하였으나 등숙율은 82%로 담수표면산파 77%보다 높았으며 쌀 수량은 515㎏/10a으로 담수표면산파 460/㎏ 대비 12% 증수되었다. 4. 농가 현지적응 3개지역 평균 ㎡당 입모수는 144개, 골내 입모율은 75.2%, 줄기 매몰심은 2.0㎝였고, ㎡당 수수는 373개로 기계이앙보다 11개가 많았고, 완전 미율 및 10a 당 백미 수량은 각각 95.8%, 578㎏으로 기계이앙과 비슷하였으며, 식미치는 77%로 기계이앙과 같았다. 5. 따라서 담수골표면산파시의 적정골거리 15㎝, 골깊이 8㎝로 제작된 작조기를 무논정지기에 부착하여 골형성후 파종작업을 했을 때 기존 담수표면산파보다 입모확보가 용이하고 새피해 및 도복피해 경감과 함께 안정 수량확보가 유리한 기술로 생각됨. This experiments was carried out to investigated cultivation effects of water wet furrow broadcasting seeding, a simple and cheap seeding furrow maker, which facilitates rice seeding and addresses lodging problem in water seeding rice was developed. The furrow maker with 432㎝ in length and 20㎝ in width was attached right after the rotary for furrow making. Before seed sowing , puddled soil is hardened for 4∼6 days and seeding furrow is prepared with the furrow maker and than the power duster is used to broadcast the pregerminated seeds. The water wet furrow broadcasting seeding was found to be stable in seedling stand by uniform seed sowing as well as in the reduction of seedling floating and high percentage of inner furrow seedling stand with 68∼74% by water wave movements : resulting to enhanced seedling furrow formation, wind pass, and light penetration. This method also ameliorates lodging problem by burying rice culm 1.6∼2.2㎝ deep as compared with conventional water seeding. Because of such factors, the milled rice yield was increased 1∼19% compared with conventional water seeding with 515㎏/10a.

트랙타 부착 대형이앙기 개발 및 재배적 실용성

박성태,장익주,정창화,김상열,김재현,문헌팔,양세준,김순철 한국국제농업개발학회 2002 韓國國際農業開發學會誌 Vol.14 No.3

쌀 생산비를 줄이고 대경지 규모화 영농에 적응할 수 있는 농기계 개발을 목적으로 연구개발한 대규모 경지적응 트랙터 부착 대형벼이앙기의 구성과 특징 및 개발시작기의 재배적 실용성 평가결과를 요약정리하면 다음과 같다. 1. 트랙터 부착 12조 대형벼이앙기는 크게 바퀴자국 제거로타리, 문짝형 정지판, 이앙장치부 등으로 구성되어 있다. 2. 트랙터 부착 12조 이앙기는 트랙터 동력을 이용하여 로타리, 정지 및 이앙작업이 동시에 이루어 질 수 있도록 개발하였다. 3. 바퀴자국을 없애는 날은 기존의 로타리 날을 교체하면 되도록 반달형 날로 제작하였다. 4. 이앙기는 이동시는 접을 수 있도록 설계 제작되어 대형화가 가능하므로 기존 6조 승용이앙기에 비하여 이앙작업 능력이 1.5배 이상이었다. 5. 트랙터 부착 대형벼이앙기는 트랙터와 같은 큰 동력원을 이용할 수 있으므로 측조시비기, 긴매트모 탑재 등 다양한 작업기 및 기능을 추가로 부착 가능하도록 설계되었다. 6. 트랙터 부착 대형벼이앙기는 어린모 및 중묘이앙시 결주율은 3.0∼4.3%로 기계이앙기 결주 허용범위 5% 미만이었다. 하지만 무경운 논에서는 이앙작업은 가능하나 부묘율이 다소 높은 점은 보완이 필요하다. To develop a labor saving rice cultivation technology, a new tractor attached rice transplanter has been developed for large scale farming and its field performance was evaluated. The rice transplanter consists of three major parts such as rotary for removing tractor tire furrow, door-shaped soil leveling plate and transplanting equipment. The rice transplanter is operated using the power of the tractor and performs rotary, harrow and seedling transplanting simultaneously. A half moon shaped rotary blade was found to be very efficient to remove tire furrow developed during seedling transplanting and the original rotary blade can be replaced easily with existed rotary blade. The seedling transplanting part of the transplanter was designed to fold into small size and the transplanting efficiency of the transplanter was found to be 1.5 times higher than that of the conventional riding type six row transplanter. Since the transplanter is operated through a strong power of the tractor, the additional attachment such as fertilizer application apparatus and long mat rice seedling carrier is possible. Based on the field performance of the transplanter, although the missing hill percentage showed roughly with 3.0∼4.3% for 10-day and 30-day old seedlings but the percentage is less than 5% which is maximum missing hill permit in the transplanting rice. Seedling transplanting in no-tillage field condition is acceptable but floating seedling percentage is still high and thus further technology improvement for minimizing floating seedling percontage is needed.

벼 기계이앙 1회용 종이 육묘상자 개발

박성태,황정동,김상열,문헌팔,양세준,김순철,유남진 한국국제농업개발학회 2003 韓國國際農業開發學會誌 Vol.15 No.3

벼 기계이앙 육묘에 주로 사용하고 있는 플라스틱 육묘상자의 문제점을 개선하고 친환경 농업 실현에도 기여할 수 있는 벼 기계이양 종이 육묘상자개발 및 육묘시험 결과를 요약하면 다음과 같다. 1. 폐지 등 혼합물을 고열압착한 종이 육묘상자는 내부 길이가 가로 58㎝, 세로 28㎝, 높이는 2㎝이고 무게는 250g이다. 2. 종이 육묘상자 모의 파종 후 10일~30일 묘소질은 플라스틱 육묘상자 모에 비하여 초장이 1.1~1.8㎝ 짧고 본당 건물중은 0.3~3.7㎎이 떨어졌으나 엽수와 모 충실도는 비슷하였다. 3. 종이 육묘상자 모의 파종 후 30일(중묘) 이앙 시 결주율은 3.3%로 플라스틱 육묘상자 모 결주율 3.2%와 거의 같았고, 출수기, 벼 생육특성 및 수량도 플라스틱 육묘상자와 비슷하였다. 4. 종이 육묘상자의 이점은 플라스틱 육묘상자에 비하여 육묘상자 비용이 약 20% 절감되고 파종 후 운반, 치상 등 작업이 용이하며, 이앙 후 회수, 세척 및 보관관리 노력이 생략된다. 그리고 이앙 후는 논에서 유기물화되므로 친환경농업에도 부합된다. A light and bio-degradable paper tray for seedling raising in machine transplanting rice was developed for the first time and a possibility for rice seedling growth was evaluated. The paper tray was made of mixture of recycling paper and sawdust, and molded under high temperature and pressure. The tray was 58㎝ length x28㎝ width x2㎝ height in size and 250g in weight per tray. The seedling height and dry weight per plant grown at the paper tray were generally 1.1 to 1.8㎝ shorter and 0.3 to 3.7㎎ lighter than those grown at the conventional plastic tray, respectively. However, other characters such as leaf number, seedling health score, missing hill, heading date, panicle and spiketlet number, and milled rice yield were similar to those in the plastic tray. Based on the result of research, the paper tray had following advantages in comparison of the plastic tray. The paper tray could be reduced seedling raising cost by 20% as compared with the plastic tray. Since the paper tray was of lightness even after seedbed soil fill-up, it was more handy and convenient to carry over. Labor input for collecting, washing, and storing the empty tray after seedling transplanting was not needed as the plastic tray. The paper tray was also bio-degraded and transformed into an organic matter, once it was incorporated into soil, which was considered as an environmentally- safe cultivation technology.

Yield Response of Rice Classified with Maturity on Extremely Late Season Culture

Sae Jun Yang,Jong Rae Kang,Jin Kim,Jae Gee Jang 한국육종학회 2003 한국육종학회 학술발표회 발표요지 Vol.35 No.3

벼 組織培養을 利用한 突然變異誘發 硏究 Ⅱ. 半數體유래 變異體의 出現頻度의 短稈變異體의 遺傳分離

Sae Jun Yang(楊世準) 한국육종학회 1990 한국육종학회지 Vol.22 No.2

This experiment was conducted to broaden the scope of mutation breeding through in vitro culture techniques. Phenotypic variation between A₂ lines derived from rice anther culture (CV, Dashukei 2) and M₂ lines derived from haploid node culture with mutagen, DES(Diethylstilbestrol) 10⁻⁵ Mol, were compared in major agronomic characters. Genetic analysis of a induced variants with stunted culm from haploid node culture with mutagen, DES, was also conduced to clarify the mode of inheritance. This was for the first time confirmed in androgenic somacolonal variants derived from haploid cell culture with mutagen. Although almost of A₂ and M₂ population were nearly same to parental variety, the frequency of lines without within-line segregation was 4.8% in anther-derived A₂ population and 19.2% in haploid node culture-derived M₂ population in phenotypic patterns. The frequency of lines with simple segregation in one or two characters was much greater in M₂ population than A₂ population. It may suggest that extent of androgenic somaclonal variation occurred in vitro process will be increased by supplemented with mutagen. A induced mutants with stunted culm and panicle length, about 87% of culm length and 81% of panicle length compard to parental variety, could be selected for genetic analysis from haploid node culture-derived M₂ population. The segregation of 505 F₂ plants and 76 BC₁F₁ plants from a cross between Dashukei 2 as parental variety and Dashukei 2 M28 with stunted culm presented nearly normal distribution curve and referred to the inheritance of a quantitative character controlled by multiple genes. Molecular evidence for explanation of androgenic somaclonal mutants should be needed in the near future.

벼 葯培養 分化植物體의 變異性 Ⅱ. 量的形質의 變異

Sae Jun Yang(陽世準),Byeong Geun Oh(吳秉根),Gun Sik Chung(鄭根植),Jae Keun Sohn(孫再根) 한국육종학회 1987 한국육종학회지 Vol.19 No.4

The present study was focused on variability of anther-derived plants in quantitative characters to obtain basic information for rice breeding through anther culture. Variability of progeny of anther-derived plants, A₂ Lines, were compared with F₂ generation of the same combination. The salient findings obtained are summarized as follows; The segregation and recombination of major characters such as days to heading, panicle length, and panicles per plant both 175 anther-derived A₂ lines and 594 F₂ plants derived from Milyang 74/Dashukei 2 F₁ hybrids presented normal distribution curves and refered to the inheritance of quantitative characters controlled by multiple genes. Expression of gene recombinants related to culm length of 48 anther-derived A₂ lines from singwangbyeo/Eunhatyeo F₁ hybrids showed similar to those of 406 F₂ plants, although average culm length of A₂ population was shorter than that of F₂ population. The segregation and recombination of fertility of 71 anther-derived A₂ lines from Milyang 62/Akibare F₁ hybids as remote cross showed clearly different from those of 578 F₂ plants. The curve of A₂ population appeared more centered, and tilted to higher fertility. This tendency was also appeared both anther-derived A₂ lines and F₂ population derived from Singwangbyeo/Eunhabyeo F₁ hybrids.

벼 葯培養에 있어서 低溫處理와 分化植物體의 倍數性

Sae Jun Yang(楊世準),Jae Keun Sohn(孫再根),Gun Sik Chung(鄭根植) 한국육종학회 1985 한국육종학회지 Vol.17 No.4

This experiment was studied to determine the effects of low temperature treatment on culturability and ploidy level of anther-derived plants in rice anther culture. N₆ basic medium supplemented with 2mg/ℓ of NAA and 1mg/ℓ of Kinetin used for callus induction, 0.2mg/ℓ of IAA and 1mg/ℓ of Kinetin for plant differentiation. Rice panicle with flag leaf sheath was pretreated by low temperature at 10℃ for 15 days. Cold-shocked anthers produced more callus induction and plant differentiation about 3 fold than those without pretreatment. Callus induced from cold-shocked anthers produced more haploid plants and less diploid plants than the callus induced from anthers without pretreatment. This tendency was recognized in a variety as well as some F₁ crosses.

벼 組織培養을 利用한 突然變異誘發 硏究 Ⅰ. 半數體에 대한 化學物質의 突然變異 誘起效果

Sae Jun Yang(楊世準),Byeong Geun Oh(吳秉根),Soo Kwan Lee(李壽寬),Gun Sik Chung(鄭根植) 한국육종학회 1988 한국육종학회지 Vol.20 No.3

This experiment was conducted to broaden the scope of mutation breeding and to introduce new source of variation by in vitro technology. Node tissue of haploid plants, derived from rice anther culture (CV. Dashukei 2) were cultured on the N6-Y1 basic medium supplemented with 10⁻⁵M NAA, 0.5 x 10⁻⁵M kinetin, and 5x10⁻⁵M ABA. Chemical mutagens, DES, EMS, Sodium Azide, and MNNG were applied in vitro system through this experiment. Diploidization of’haploid plants regenerated from node culture with mutagens were conducted. The progeny of regenerated diploid plants, M₂ generation, were evaluated in their major agronomic characters, and they were compared with A₂ generation derived from anther culture. Haploid plants directly regenerated from node tissue of haploid without callus formation. The ratio of plant regeneration was decreased when the concentration of chemical mutagens were increased. Autodiploidization ratio by tiller separation was 3.1% while that of 0.2% colchicine treatment for 12 hours was 23.0% under the field condition. Phenotypic patterns of 197 M₂ lines derived from node culture with mutagens showed that 80.2% M₂ lines were similar to their parental variety, but the others were different in some characters. For days to heading and culm length the means did not change but the range of variance was larger in M₂ lines than in parental variety. Distribution of days to heading in 146 M₂ lines derived from DES treatmat was similar to 137 A₂ lines derived from anter culture, but that of culm length between two populations showed a significant difference.

벼 葯培養 分化植物體의 變異性 Ⅲ. 質的形質의 變異

Sae Jun Yang(楊世準),Byeong Geun Oh(吳秉根),Gun Sik Chung(鄭根植),Jae Keun Sohn(孫再根) 한국육종학회 1988 한국육종학회지 Vol.20 No.1

The present study was focused on variability of qualitative characters in anther-dervied plants to obtain basic information for rice breeding through anther culture. Variability in the progeny of antherderived plants, A₂ lines, were compared with F₂ generation of the same cross combination. The frequency of tall in culm length was 79% in 594 F₂ plants, but 56% in 175 A₂ lines derived from Milyang 74/Dashukei 2 F₁ hybrids. The ratio of tall to short was 3:1 in F₂ population, and 1:1 in A₂ lines. Short culm of Milyang 74 was controlled by a recessive gene. There was no variants related to glaborous leaf blade of Dashukei 2 and resistant reaction to bacterial leaf blight, pathotype K₁, of Milyang 74 in A₂ lines. The glaborous leaf blade blade of Dashukei 2 controlled by a recessive gene and resistant reaction to bacterial leaf blight, pathotype K₁, of Milyang 74 controlled by a dominant gene were domonstrated in both F₂ population and A₂ lines derived from Milyang 74/Dashukei 2 F₁ hybrids.