곰소만에 있어 바지락포자충, Perkinsus sp.의 출현에 관하여

박경일,최광식,최진우,PARK Kyung-Il,CHOI Kwang-Sik,CHOI Jin-Woo 한국수산과학회 1999 한국수산과학회지 Vol.32 No.3

이 연구를 통하여 바지락 대량 폐사가 발생한 전라북도 곰소만에 서식하고 있는 패류, 바지락, R. philipinarium, 굴 C. gigas, 피조개, S. broughtonii, 피뿔고둥, R. venosa, 등을 대상으로 바지락포자충, Perkinsus sp. 감염 여부 및 정량적인 분석을 수행하였다. 바지락포자충의 감염 진단은 Ray(1952)의 방법에 따라 혐기성배양액인 FTM(Fluid Thioglycollate Media)을 이용하여 배양하였으며, Rugol's iodine으로 염색한 후 해부현미경 하에서 검사하였다. 바지락포자충의 감염 정도는 Mackin (1961)의 기준을 따랐으며 일부 시료는 Choi et al. (1989)의 정량적인 방법에 따라 NaOH로 처리한 후 혈구 계수기로 계수하였다. FTM 분석 결과 곰소만에서 채집된 모든 바지락 개체들은 바지락포자충에 감염된 것으로 나타나 감염율 (prevalence)은 $100\%$였다. Mackin의 기준에 따른 감염 정도 판정에서 평균 2.87로 나타나 중간 정도의 감염 정도를 나타냈다. 바지락 육중량 1g 당 바지락포자충의 개체수는 평균 709,028 개체였으며, 바지락 1개체당 최고 4,091,667 개체의 바지락포자충이 발견되었다. 곰소만에서 채집된 패류를 대상으로한 FTM 검사 결과, 굴에서는 바지락 포자충이 전혀 발견되지 않았으며, 새로막과 피뿔고둥에 대한 조사에서는 피조개 2 개체에서만 각 각 6, 10 개의 바지락 포자충이 발견되었고 피뿔고둥에서는 전혀 발견되지 않았다. 조직병리학적 관찰결과 바지락 아가미의 연결조직에서 무정형의 결절에 쌓여있는 직경 $6\~10\;\mu$m의 tropozoites를 발견하였다. 바지락의 비만도는 개체의 각장이 클수록 낮게 나타나는 경향을 보였으며, 바지락 포자충의 감염정도는 각장이 클수록 높게 나타났다. 바지락포자충은 개체에서 개체로 감염되는 관계로 바지락밀도가 높은 지역에서는 그 전염 속도가 높은 것으로 알려져 대량폐사의 원인 중 하나는 밀식으로 판단되었다. Mass mortality of the Manila clam, Ruditapes philippinarum has been reported all along the west and south coast of Korea for the past several years. As a pathogenic agent, Perkinsus sp., an endoparasitic protozoan has been identified in this study and believed to be responsible for the mass mortalities. Prevalence and infection intensity of Perkinsus sp. was investigated from a Manila clam population inhabiting at Komsoe Bay in the west coast where mass mortality of the clam has been reported. A total of 142 Manila clam, 50 oyster, Crassostrea gigas, 10 ark shell, Scapharca broughtonii, and 5 predatory gastropada, Rapana venosa were examined for the presence and the quantity of Perkinsus sp. Ray's fluid thioglycollate medium method (FTM method) with modified Mackin's infection intensity scale and Choi's quantitative method were used in detecting and quantifying the parasite. All individuals of R. philippinarum examined in this study were infected with Perkinsus sp., indicating $100\%$ prevalence while none of the oysters and the gastropods exhibited the parasite. Six to ten individual hypnospores of Perkinsus sp. were counted from the ark shells. The number of hypnospores in the clam tissues varied from 16,667 to 4,091,667, with a mean number of 1,077,628. Average infection intensity according to Mackin's was 2.87, indicating a moderate infection. A negative correlation was observed between the number of Perkinsus sp. in the tissue and the condition index, a ratio tissue wet weight to shell cavity volume. The clam size and the infection intensity in terms of total number of parasites were positively correlated; the bigger clam, the heavier infection. Such high number of Perkinsus sp. counted in the clams could be enough to cause physiological disturbance of clams, such as retarded growth and reproduction. It is also believed that such a high infection leads mortality of the clam via continuous draining of the energy by metabolic activities and reproduction of the parasites. Correlation between the condition index and the infection intensity observed in this study supports this hypothesis.

고품질 소프트웨어 개발을 위한 테이블 분석방법

최신형,진광윤 三陟大學校 2003 論文集 Vol.36 No.-

본 논문에서는 요구분석 및 설계단계에서 도출된 각종 명세서를 기반으로 하여 통합 테스트 단계에서 작성되는 테스트 시나리오의 오류를 최소화하기 위한 방안으로서 테이블 분석방법을 제시한다. 이를 이용하면 통합 테스트 단계에서 작성되는 테스트 시나리오 작성에 오류를 줄임으로써 특별한 검토과정 없이 요구분석 및 설계단계에서 얻어진 명세서에 의존해서 테스트 시나리오를 작성하는 방법에 비해 테이블 정보에 대한 오류를 최소화함으로써 테스트 능률향상 뿐 아니라 테스트 비용을 크게 줄일 수 있다. 이를 바탕으로 통합 테스트를 수행한다면 보다 정확한 테스트가 가능하므로 최종산출물인 소프트웨어에 대한 품질을 향상시킬 수 있다. Is based on various detailed statements that is drawn requirement analysis and design stage in this paper and presents table analysis method by way to minimize error of test scenario that is made out at integration test step. If use this, can reduce greatly test expense as well as test efficiency elevation by minimizing error about table information. If achieve integration test with this, can improve quality about software that is last product because correct test is available.

분산환경에서 유전자 알고리즘을 이용한 고 가용성 디스크 캐쉬 관리자 연구

최신형,진광윤 三陟大學校 産業科學技術硏究所 2003 産業科學技術硏究論文集 Vol.8 No.2

This paper presents the design and implementation of the Disk Cache Manager (DCM). which operates on top of the micro-kernel based distributed operating system for clustering system connected with multiple PC. and enhances the I/O performance of the shared disks. The DCM interacts with different servers through message passing mechanism provided by the micro-kernel. To increase the shared disk I/O performance, the DCM employs a Seven, Disk and a Socid Disk for each physical shared disk. so that it enables efficient data placements for shared disks. The cluster node of the node allocation system provides a good allocation solution using Genetic Algorithms(GA) distributing the parallel modules to the clustered nodes. As an utilization of a certain shared disk is incremented, the DCM enlarges a corresponding cache size. thus increasing the hit ratio of the disk cache. In result. the enhancement of the overall disk I/O performance can be achieved.

TetR-VP16-mediated transcription activation system에서 TetR-VR16과 TetR 이종dimer에 의한 전사활성의 영향

최광훈,김기호,김홍진 중앙대학교 약학연구소 1999 약학 논총 Vol.13 No.-

In TetR-VP16-mediated transcription activation stystem TetR-VP16 hobodimer activates the tet operator modified minimal promoter. To determine the effect of the heterodimer of TetR-VP16 on transcriptional activation from that minimal promoter cotransfection assays were performed with U373 cells. In coexpression of TetR-VP16 and TetR the expression from the minimal promoter was activated 4-12 fold higher than in expression of TetR-VP16, suggesting that the usage of the heterodimer of TetR-VP16 can improve the effecacy of TetR-VP16-mediated transcription activation system

企業到産豫測에 있어서 現金흐름 情報의 有用性에 관한 實證的 硏究

崔光鉉,姜鎭守 영남이공대학 1995 論文集 Vol.24 No.-

The debate of accrual basis and cash flow reporting is one of the most representatives in the accounting literature. In special, many empirical studies argue that cash flow information has the additional predictive ability in predicting business failure. Accordingly, this study is to test the predictive ability of business failure by cash flow information. In order to achieve the purpose, two hypotheses are tested by multiple discriminant analysis and laboratory experiment method. Sixty samples were selected in the listed firms from 1982-1990. Thirty failure companies of them were matched by thirty non-failure companies. The results of the study are as follows: 1. The model that includes a cash flow information has superior predictive ability to the model that cash flow information is excluded. 2. The combined model that includes cash flow and financial ratios has better discriminant ability than the seperate models:one using the financial ratios and one using cash flow ratios.

성인의 경부 전면 중앙부위에서 발생한 기형종 1예

최월용,정효진,채종인,하태인,정상렬,이광재,채병도,최영식 고신대학교 의학부 2004 高神大學校 醫學部 論文集 Vol.19 No.1

Teratomas are embryonal neoplasms that show characteristics of three germ cell layers(ectoderm, mesoderm, and endoderm). They are distributed in the following regions: sacrococcygeal(57%), gonadal(29%), mediastinal(7%), cervical(3%), retroperitoneal(4%), and intracranial(3%) regions. Non-gonadal treatomas present in infancy whereas gonadal are seen in adolescence. Especially, teratomas that occurred in midline neck of adult are very rare and are confused with thyroglossal duct cysts, cystic hygromas, and thyroid tumors. We report, along with the review of appropriate literature, a case of histopathologically confirmed benign teratoma in the midline neck of a 33 years old woman.

농업재해관리를 위한 지리정보시스템의 활용

최진용,윤광식 공주대학교 방재연구센터 1998 공주대학교 방재연구센터 논문집 Vol.2 No.-

Occurrence of agricultural disasters such as drought and flood is increasing due to erratic global weather conditions. Geographic Information System (GIS) is efficient tool for spatial analysis and utilized for develoment of agricultural disaster management systems systems which enhance understanding of severity and restoration of damage by disasters. In this paper, characteristics of several agricultural disaster are reviewed and examples of GIS applicaition for disaster. Preparedness and management systems of Korea and other countries are introduced.

당뇨병성 신증 환자 20예에서 복합한약전탕액이 신기능에 미치는 영향

최우정,김동웅,신선호,이언정,최진영,신학수,조권일,이광석 대한동의생리학회,대한동의병리학회 2003 동의생리병리학회지 Vol.17 No.2

Diabetic Nephropathy is one of the major causes of chronic renal failure. It is a common microvascular complication and clinically defined as the presence of persistent Proteinuria. We studied the effects and change of the renal function of Complex Herbal medication of the 20Diabetic Nephropathy patients. We measured the initial levels of Total Protein, Creatinine Clearance Rate(Ccr), Serum Creatinine(Serum-Cr), Urine Creatinine(Urine-Cr) and HbA1C on admission and followed up the level changes of Total Protein, Ccr, Serum-Cr and Urine-Cr on discharge. The results are following : Complex Herbal Medication does not cause the renal toxicity. The longer hypertension period is, the higher Serum-Cr level and Urine-Cr level. In an older age group, Urine-Cr is lower. 4.From the "Deficiency in Origin and Excess in Superficiality(本虛表實)“points of view, Complex Herbal Medication improves the Serum-Cr in Diabetic Nephropathy patients. According to this results, it could be suggested that Complex Herbal Medication does not cause the renal toxicity in Diabetic Nephropathy patients and intensive controls of blood sugar, blood pressure and Complex Herbal Medication prevent the renal failure in Diabetic Nephropathy patients with early stage of Microalbumiuria.

모듈간의 유사성 분석을 통한 시스템 규모 축소 및 재사용에 대한 연구

최신형,허경욱,진광윤 三陟大學校 1999 論文集 Vol.32 No.1

소프트웨어에서 유사한 모듈의 분석으로 소프트웨어 시스템 규모를 축소하거나 재사용 여부를 판단할 수 있다. 본 논문에서는 모듈간 유사성을 나타내는 방법으로 모듈 유사성률과 복잡성을 측정하는 사이크로매틱 그래프를 이용하여 유사한 모듈들을 하나로 통합해서 새로운 모듈을 만들어서 사용하는 방안을 제시한다. 이는 시스템 규모 축소와 모듈 재사용을 위해서 유사한 모듈을 찾아내어 구조화하는데 유용하다.

Microwave Absorption Characteristics of U-Type Ferrite Powders According to Substitution Elements and Its Compositions

Kwang‑Pil Jeong,Su‑Won Yang,Jin‑Hyuk Choi,Jeong‑Gon Kim 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.8

In this study, partially substituted U-type ferrite (Ba4MexCo2-xFe36O60, Me: Mn, Ni, Zn, x=0.5 and 1.0) powders weresynthesized by sol–gel method. The powders were analyzed for phase formation, morphology and magnetic properties byXRD, FE-SEM and VSM respectively. The synthesized ferrite powders were pressed into a series of toroidal shaped samples,in which the weight ratio of parafn to powder was 1:5. The complex scattering parameters were measured by using vectornetwork analyzer in the frequency range of 2–18 GHz and were employed in the calculation of refection loss with variousthicknesses. The minimum refection loss was observed in the substituted nickel sample as−24.4 dB (absorption rate 99.6%)with a thickness of 2.5 mm and the bandwidth was achieved 4.8 GHz (from 7.5 to 12.3 GHz) for refection loss≤ −10 dBin the substituted zinc sample.