• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1991.10a
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• pp.79-82
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• 1991

In this paper we examined, by using the PET film with thickness of 16-350$\mu\textrm{m}$, space charge focused on TSC peak at the slightly higher temperature than transition temperture of the glass. In the result we found that charge quantity, leaking current and absorbing current at TSC peak were rarely dependant its thickness at the Al foil contact electrde. In the case of Al evaporated electrode, the absorbing current was rarely dependent its thickness but TSC charge quantity at C-peak was increased directly proportional to its thickness and leaking current was decayed inversely proportional to its thickness. Also current-volteag characteristics showed sublinerar property under ohmic area at the Al evaporated electrode.

• Electrical & Electronic Materials
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• v.6 no.2
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• pp.161-167
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• 1993

ZnO 바리스터의 비선형 전도특성은 입자의 구조로부터 설명할 수 있다. 본 논문에서는 ZnO 바리스터의 입자구조에 트랩된 캐리어를 분석하기 위해서 TSC 측정 기법을 사용하였다. 측정 결과로 부터 네개의 TSC피크를 얻었다. 고온으로 부터 첫번째 두번째와 세번째 TSC피크의 기원은 각각 트랩, 도너 밀도 및 입계층의 트랩으로 나타나고 네번째 피크의 기원은 공핍층에 있는 도너 이온의 탈분극에 의해서 기인하는 것으로 사료된다. .alpha.$_{1}$피크의 활성화 에너지는 약 0.33-1.42eV였다. 또한 바리스터의 예비동작 영역에서의 전도특성은 .alpha.$_{1}$과 .alpha.$_{2}$피크의 값에 지배된다는 것을 확인하였다.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.185-186
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• 2015

TSC는 전력계통의 무효전력 보상을 위한 SVC 시스템의 주요 장치이다. 본 논문에서는 TSC의 커패시터 뱅크의 열화 및 고장진단에 활용할 수 있는 커패시터 용량 측정 기법을 제안한다. 제안한 커패시터 용량 측정 기법은 시간영역 해석 기법으로서 커패시터의 전압 및 전류 신호에 포함된 고조파 및 잡음, 주파수 변동, 과도 상태 전이 등의 왜란에 강인하다.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2005.05b
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• pp.123-126
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• 2005

In this study, the Thermally Stimulated Current(TSC) of corona charged PTFE is studied and the simulation of corona charging process is also calculated by Finite Element Method. The electrets which were formed by applying high voltages (DC ${\pm}5{\sim}{\pm}8$ [kV]) to PTFE, are used to measure TSC in the temperature range of $-100{\sim}+200$ [$^{\circ}C$] and then the Finite Element Method is performed to examine corona charging process using a obtained physical constants. As a result. it is confirmed that the charging negative corona is profitable as the applications are manufactured, because the time constant of negative corona is much larger than it of positive corona. And it is attempted to estimate the corona charging process in space using simulation.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1992.05a
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• pp.125-129
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• 1992

When relaxation time will be distributed, TSC observed in the experimental procedure was analysed by using a potential model having two equilibrium positions and equations of dielectric properties was derived. Calculation of distribution was made by matrix method and compared/confirmed values obtained by TSC and alternating current which have a correspondence with each other. In this measurement, distribution of activation energy and relaxation time was determined by TSC peak at around 147k/364 of which center is 10$\^$-4/ sec/10$\^$5/ sec respectively at room temperature and also obtained dielctric loss factor at the range of 10$\^$-7/-10$\^$5/Hz. It seems that low temperature peak is local dispersion and high temperature peak have a relation to dielectric transition of the material.

• Electrical & Electronic Materials
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• v.8 no.6
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• pp.759-767
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• 1995

This paper examines the electrical properties according to a curing time and a corona degradation in epoxy composites which are used for transformers. To consider these phenomena, the electrets were formed by appling high voltages to five kinds of specimens designed according to a constant mixing rate and then TSC(Thermally Stimulated Current) values at the temperature range of -160-200[>$^{\circ}C$] were measured from a series of experiments. The behaviour of carrier and its possible origins in epoxy composites were studied. Various effects of curing time and electric field on epoxy composites were also investigated.

• Proceedings of the Korean Information Science Society Conference
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• 1999.10a
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• pp.563-565
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• 1999

실시간 시스템은 응용분야의 특성상 높은 신뢰성을 요구하므로 설계시 시스템의 정확성과 안전성을 보장하는 것은 매우 중요하다. 신뢰성 보장을 위한 방법으로 정형기법(formal method)을 이용한 명세 방법이 연구되어 왔다. 정형적인 명세를 사용하는 경우 원하는 시스템의 특성에 대한 검증이 가능하며 자연어로 명세한 경우보다 모호함이 줄어들어 의사소통을 하는데 있어서 명확성을 제공한다. 그러나 이런 장점에도 불구하고 객체 지향 개발 방법론에서의 정형적인 명세에 관한 연구가 미흡하다. 본 논문에서는 객체 지향적 모델을 기반으로 하는 실시간 시스템을 위한 정형명세 언어인 Timed State Chart(TSC)를 제안한다. TSC는 Statecharts와 같은 계층적 상태 기계 모델(state machine model)로서 다양한 시간 제약사항의 명세를 위해 클릭 변수(clock variable)를 도입하여 실시간 객체(Real-Time Object 또는 RTO)를 명세한다. TSC를 이용하여 기존의 연구에서 표현할 수 없었던 주가와 마감시간과 같은 실시간 시스템의 다양한 요구사항을 효과적으로 표현할 수 있다.

• Journal of The Korean Society of Grassland and Forage Science
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• v.5 no.1
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• pp.13-21
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• 1985

This experiment was carried out to study the effect of the autumnal cutting times on the regrowth, the accumulated carbohydrate and dry matter yield of Italian ryegrass The results were summarized as follows: 1. In dry matter yield, the plot of earlier cutting was shown the highest yield (p<0.05), and that of the last-cutting was shown lower yield of dry matter than that the none-cutting plot. 2. TSC (Total Water Soluble Carbohydrate) content slightly decreased after the first cutting and gradually increased according to the regrowth, and then decreased again to the second cutting time. And also the TSC content levels of stubble, stem and leaf at one week before falling to sub-zero temperature were all the highest in the eariler cutting plot (p<0.01), and there was significant correlation between the TSC content level and the second harvested dry matter yield (p<0.05). 3. CGR (Crop Growth Rate) was decreased below $8^{\circ}C$. RLGR (Relative Leaf area Growth Rate) and NAR (Net Assimilation Rate) were both high during 30 days after regrowth, and low after regrowth in all plots. LAI (Leaf Area Index) rapidly increased during 50 days after cutting, and then slowly increased in all the plots, and maximum LAI was 3.4-5.8. Also dry matter yield increased in the plots having a high LAI to 70 days after cutting. 4. It was recognized that there were significant correlation between TSC, LAI, CGR, NAR, LWR (Leaf Weight Ratio) and the second harvested dry matter yield during the low temperature periods, and the degree of contribution to dry matter yield was in order of LWR>LAI>TSC>NAR>CGR.

• Korean Journal of Psychosomatic Medicine
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• v.26 no.1
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• pp.35-43
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• 2018

Objectives : Effects of multiple trauma are complex and extend beyond core PTSD symptoms. However, few psychological instruments for trauma assessment address this issue of symptom complexity. The Trauma Symptom Checklist-40 (TSC-40) is a self-report scale that assesses wide range of symptoms associated with childhood or adult traumatic experience. The purpose of the present study was to evaluate the validity of the Korean Version of the TSC-40 in a sample of psychiatric outpatients. Methods : Data of 367 treatment-seeking patients with DSM-IV diagnoses were obtained from an outpatient department of psychiatric unit at a university hospital. The diagnoses were anxiety disorder, posttraumatic stress disorder, depressive disorder, adjustment disorder and others. Included in the psychometric data were the TSC-40, the Life events checklist, the Impact of Event Scale-Revised, the Zung's Self-report Depression Scale, and the Zung's Self-report Anxiety Scale. Cronbach's ${\alpha}$ for internal consistency were calculated. Convergent and concurrent validity was approached with correlation between the TSC-40 and other scales (PTSD, anxiety and depression). Results : Exploratory factor analysis of the Korean Version of TSC-40 extracted seven-factor structure accounted for 59.55% of total variance that was contextually similar to a six-factor structure and five-factor structure of the original English version. The Korean Version of TSC-40 demonstrated a high level of internal consistency. (Cronbach's ${\alpha}=0.94$) and good concurrent and convergent validity with another PTSD scale and anxiety and depression scales. Conclusions : Excellent construct validity of The Korean Version of TSC-40 was proved in this study. And subtle difference in the factor structure may reflect the cultural issues and the sample characteristics such as heterogeneous clinical population (including non-trauma related disorders) and outpatient status. Overall, this study demonstrated that the Korean version of TSC-40 is psychometrically sound and can be used for Korean clinical population.

• Clinical and Experimental Pediatrics
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• v.50 no.2
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• pp.178-181
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• 2007

Purpose : The renal manifestations of tuberous sclerosis complex (TSC) are remarkably diverse, including polycystic kidney disease, simple renal cysts, renal cell carcinomas, and angiomyolipomas. All of these occur in children as well as adults in TSC. Angiomyolipomas, which can cause spontaneous life-threatening hemorrhages, are by far the most prevalent and the greatest source of morbidity. Here, we will address our experience, adding to the literature on pediatric patients with TSC requiring evaluation and treatment for renal manifestations. Methods : A retrospective analysis was made on 19 patients in whom TSC was diagnosed between May 2001 and Oct. 2005 at Severance Hospital. All patients had clinical diagnoses of TSC as defined by the 1998 tuberous sclerosis complex consensus conference. Results : The patients consisted of 13 boys and 6 girls with a mean age of 7.3 years (range 1 to 22). The renal disease associated with TSC included angiomyolipoma in nine patients (47.4 percent), renal simple cyst in one (5.3 percent), hydronephrosis in one (5.3 percent) patient. Eight patients (42.1 percent) presented with normal kidney contours at abdominal ultrasonography. One patient underwent renal replacement therapy due to chronic renal insufficiency after nephrectomy. Hemorrhage from angiomyolipoma was not detected. Conclusion : In our review of 19 cases of TSC, renal manifestations are reported in 57.9 percent of patients. Asymptomatic angiomyolipoma associated with TSC grow gradually, although severe hemorrhages are rare. So patients with TSC should be followed up with serial computerized tomography or abdominal ultrasonography. And also, renal function should be monitored conservatively.