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사육수 비교환 방식에 의한 흰다리새우의 고밀도 사육 II. 흰다리새우의 실내 중간양성
장인권,김종식,서형철,조국진 한국양식학회 2009 韓國養殖學會誌 Vol.22 No.1
Shrimp farming which is entirely conducted in outdoor ponds in the west coast of Korea has been suffered from mass mortality due to viral epizootics. Intensive indoor shrimp culture under limited water exchange can solve these problems of outdoor ponds including viral transmission from environment, pollution due to discharge of rearing water, low productivity and limited culture period. In this study, juvenile L. vannamei (B.W. 0.08-0.09 g) was stocked with 3,000-5,455/m3 in density in four raceway tanks (two 12.9 m2, two 18 m2 tanks) and cultured for 42 days with 2.7-3.4% of daily water exchange. Results from four tanks showed FCR of 0.79-1.29, survival of 38.2- 48.0%, and yields of 2.49-4.22 kg/m3 which is consistent with 12-20 and 8-14 times higher than those of commercial shrimp hatchery and outdoor pond in Korea, respectively. Concentrations of total ammonia nitrogen in all four tanks were 1.11-1.42 ppm in mean level and did not exceed 6.0 ppm (0.096 ppm of NH3) which is still acceptable levels for shrimp growth. During the culture trial, concentration of NO2-N rapidly increased from stocking, resulting in mean concentration of 18.45-22.07 ppm. It also exceeded 10 ppm over four weeks and maintained at 35-45 ppm for four days in all tanks, accounting for low survival of shrimp due to long-term exposure to high concentration of NO2-N. Nevertheless, the results with survival rate over 38% from raceways which experienced the extreme NO2-N levels suggests that under “biofloc system” white shrimp can acclimate to high NO2-N concentration to some degree.
하악에 식립된 Xive implant 환자의 분포 및 식립부 유형과 생존율
장인권,정의원,김창성,심준성,조규성,채중규,김종관,최성호,Jang, In-Kwon,Jung, Ui-Won,Kim, Chang-Sung,Shim, Joon-Sung,Cho, Kyoo-Sung,Chai, Jung-Kiu,Kim, Chong-Kwan,Choi, Seong-Ho 대한치주과학회 2005 Journal of Periodontal & Implant Science Vol.35 No.2
This study is an analysis of distribution of patients who installed Xive implant in Yonsei University Hospital and types of implant site for about 2 years recall check and cumulative survival rate. 41 implant were used in this study. It shows the conclusion below. 1. Patients at the age of 40s and 50s were 60% of all implant cases and average number of implant was 2.4(man), and 1.9(woman). All cases were operated on mandible, 3 implants on anterior region and 38 implants on posterior region. 2. The major cause of tooth loss is dental caries(48.8%), followed by periodontal disease. 3. Most distribution of bone qaulity for mandibular implant site was type II(65.8%) and bone quantity was type B(75.6%). 4. The majority of implants were those of 11, 13mm in length(95%) and regular diameter in width (64%). 5. The 41(19 persons) Xive implants that were placed in the mandibular anterior and posterior region were all survival and showed a 100% 2 year cumulative survival rate. The results provided us with basic data on patient type, implant distribution, bone condition, and survival rate. We wish that our results coupled with other research data helps assist in the further study for better implant success rates, etc.
사육수 비교환 방식에 의한 흰다리새우의 고밀도 사육 I. 후기유생(postlarva)의 실내 중간육성
장인권,김종식,조국진,서형철,조영록,Ayyaru Gopalakannan,김봉래 한국양식학회 2008 韓國養殖學會誌 Vol.21 No.4
Farming of the fleshy shrimp Fenneropenaeus chinensis which is a major cultured species in the west coast of South Korea, has been suffered from mass mortality due to disease epizootics including viruses. Since the Pacific white shrimp Litopenaeus vannamei was introduced to Korea in 2003, farming of this species has rapidly increased for years, occupying 62.5% of total cultured shrimp production in 2007. However the studies on L. vannamei culture methods for shrimp farming situations in Korea are very limited. Nursery culture of shrimp larvae has some advantages including increased survival, improved feed efficiencies, enhanced growth performance and reduced grow-out period. In this study, L. vannamei postlarvae (PL3-PL10) with a density of 3,750-9,090/m3 were cultured in four raceways under limited water exchange condition for 35 days. Survival was the highest (93.6%) in tank stocked with 4,090/m3 and was the lowest in tank with 9,090/m3(58.1%). Mean body weight at harvest ranged from 0.071 to 0.108 g, and FCR was 0.59-0.70 in all tanks. Concentration of total ammonia nitrogen was increased up to 20 ppm on day 10 in all tanks and thereafter gradually decreased by the third week of culture. Nitrite-nitrogen was rapidly increased from the third week, representing bio-floc condition by developed nitrifying bacterial community. Of the present nursery system some modification of structure and consideration for commercial scale are needed in order to be implemented to shrimp farmers.
장인권,곽병만,유용균 대한기계학회 2006 大韓機械學會論文集A Vol.30 No.5
Design space optimization using design space adjustment and refinement is used to optimize a knuckle in the suspension system of an automobile. This approach is a new efficient method for large-scale topology optimization by virtue of two reasons. First, design space adjustment including design space expansion and reduction is suitable for large-scale problems. Second, the design space refinement can be done globally or locally where and when necessary and thus is very effective in obtaining a target resolution with much less number of elements. Compliance minimization for a knuckle is considered with a realistic working condition to show the effectiveness and superiority of the new approach.
장인권,Ayyaru Gopalakannan,Kannan Suriakala,김종식,김봉래,조영록,Xian-Hong Meng,서형철 한국수산과학회 2008 Fisheries and Aquatic Sciences Vol.11 No.4
Viral diseases are major emerging problems of shrimp that have affected the production, and even complete losses for shrimp farms. In this study, we developed a sensitive TaqMan real-time PCR method to quantify white spot syndrome virus (WSSV) and hepatopancreatic parvovirus (HPV) in the shrimp and pond water in which fleshy shrimp, Fenneropenaeus chinensis, and Pacific white shrimp, Litopenaeus vannamei, are reared. WSSV and HPV in pond seawaters ranged from 1.65×103 to 2.43×109 and from 0 to 4.43×105 copies/L of seawater, respectively. Of 20 ponds analyzed, all pond water and shrimp were positive for WSSV. L. vannamei showed higher susceptibility to WSSV than F. chinensis. HPV was detected only in the pond water for F. chinensis. In shrimp tissue, however, HPV was found in both species, with 23-times higher infection rate in F. chinensis than L. vannamei. The total bacterial counts in the pond water ranged from 2.23×103 to 1.98×105 CFU/mL. The variations in total bacterial count for each pond appeared to correlate to the variations of the WSSV load. Statistical analysis indicated that there was no significant difference (P>0.05) between the WSSV load in pond water and shrimp, and there was no relationship between total bacterial load and viral load in the pond water. However, a significant difference (P<0.01) was found between HPV load and L. vannamei and F. chinensis pond water.