• Journal of Power Electronics
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• 제16권5호
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• pp.1763-1772
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• 2016

To reduce system complexity and implementation costs, fully-controlled H-bridge (FHB) modules and diode H-bridge PFC (DHB) modules are cascaded to form a hybrid cascaded H-bridge rectifier (HCHR). In this paper, the advantages of such a HCHR over other cascaded rectifiers are analyzed depending on the numbers of FHB modules and DHB modules. Therefore, to assign proper numbers to these two kinds of modules for the HCHR, a configuration determination method is investigated under balanced and imbalanced loads. Three principles are also presented to guide the configuration determination for the HCHR. In addition, the constraints for selecting the step-up ratio and filter inductance are derived based on a phasor diagram analysis. The proposed configuration determination method is validated by simulations under three different conditions in the PSIM environment. Finally, experiments are carried out on a scaled-down prototype where the configuration can be easily adjusted. The feasibility of the proposed theory is then verified by experimental results.

• Journal of Microbiology and Biotechnology
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• 제17권4호
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• pp.685-690
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• 2007

The deoxysugar biosynthetic gene cluster of Sch 47554/Sch 47555 was cloned from Streptomyces sp. SCC-2136. One of the ORFs, schS6, appeared to encode glucose-1-phosphate thymidylyltransferase, which converts dTTP and glucose-1-phosphate to TDP-D-glucose and pyrophosphate. The dTDP-D-glucose is a key metabolite in prokaryotics as a precursor for a large number of modified deoxysugars, and these deoxysugars are a maj or part of various antibiotics, ranging from glycosides to macrolides. SchS6 was expressed in E. coli vector pSCHS6 and the expressed protein was purified to apparent homogeneity by ammonium sulfate precipitation and Ni-NTA affinity column chromatography. The specific activity of the purified enzyme increased 4.7-fold with 17.5% recovery. It migrated as a single band on SDS-PAGE with an apparent molecular mass of 56kDa. The purified protein showed glucose-1-phosphate thymidylyltransferase activity, catalyzing a reversible bimolecular group transfer reaction. In the forward reaction, the highest activity was obtained with combination of dTTP and ${\alpha}-D-glucose-1-phosphate$, and only 12% of that activity was obtained with the substrates $UTP/{\alpha}-D-glucose-1-phosphate$. In the opposite direction, the purified protein was highly specific for dTDP-D-glucose and pyrophosphate.

• Advances in pediatric surgery
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• 제6권1호
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• pp.45-49
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• 2000

Henoch-Sch$\ddot{o}$nlein purpura is a systemic vasculitis of unknown etiology that is probably related to an autoimmune phenomenon. Henoch-Sch$\ddot{o}$nlein purpura is characterized by a purpuric rash, arthralgia, nephritis, and gastrointestinal manifestations. We reviewed 169 children hospitalized with a diagnosis of Henoch-Sch$\ddot{o}$nlein purpura between 1989 and 1998. One-hundred thirty-nine (82.2 %) had gastrointestinal findings including abdominal pain, nausea, vomiting and gastrointestinal bleeding. Surgical consultations were obtained for ten children, and laparotomy was performed in five. Three children suspected of having appendicitis underwent appendectomy. None had appendicitis. One child thought to have been intestinal strangulation was found to have hemorrhagic edema of the proximal jejunum and of the distal ileum. Another child underwent resection for an hemorrhagic infarct of the distal ileum. A high index of suspicion of this disease entity in the differential diagnosis of abdominal pain in children can avoid unnecessary laparotomy in most cases. However, life-threatening gastrointestinal complications may occur in low percentage of cases. Prompt recognition and adequate radiologic evaluation of the abdominal manifestation of this entity is necessary for early surgical intervention.

• 한국주거학회논문집
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• 제15권1호
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• pp.163-174
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• 2004

The purpose of this study was 1) to analyze the attitudes about Senior Congregate Housing(SCH) among 4 urban areas, 2) to propose the various model for SCH which should be provided to satisfy the demand. Same opinions among 4 urban areas were ; 1) Whom were willing to move into SCH for later life, most of them were in early 50s. Most of the respondents desired to be serviced community alarm system, preferred one-room style, size of 11∼15 Pyung, and preferred living at suburban area. The multi-family type was preferred when not being healthy and be singled, but if healthy, preferred the type of single detached house. And they preferred the home ownership, highly valued of heating control system, health care and leisure programs. Thus for the future SCH, it should be designed all facilities were equipped with sports facilities, sauna and leisure programs. The findings indicated that the high rates of supporting with professional management for 24 hours by turn. But different opinions among 4 urban areas were; 2) Willingness live in SCH for later life had little difference in level of income, education, property. Especially, residents of Seoul Metropolitan area and Busan did not want to open their own common facilities to the public.

• Journal of Electrical Engineering and Technology
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• 제13권1호
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• pp.30-37
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• 2018

Unlike an AC system, a DC system does not cause problems with synchronization, stability, reactive power, system losses, and cost. However, more research is still required for the application of DC Systems. This paper proposes a stable black-start strategy for a stand-alone DC micro-grid, which consists of an energy storage system, photovoltaic generator, wind-turbine generator, diesel generator, and DC loads. The proposed method is very important for avoiding inrush current and transient overvoltage in the power system equipment during restoration after a blackout. PSCAD/EMTDC software was used to simulate, analyze, and verify the method, which was found to be stable and applicable for a stand-alone DC micro-grid.

• 대한가정학회지
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• 제42권7호
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• pp.1-17
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• 2004

This study was conducted to determine the influence of socio-economic status of potential consumers on the types of senior congregate housing(SCH) among 4 urban areas(Seoul Metropolitan area, Busan, Gwangaju, and Daejun). This study was part or a research series to develop SCH which meets the korean situation. The Questionnaire used for the final analysis involved 1006 people and SPSS Windows program was used for statistical analysis. The opinion about SCH should differ among the 4 urban areas according to Socio-Economic Status(SES). The results of this study were as follows: The opinions on SCH varied in each region according to SES indicating that diverse constructions of senior housing to meet selective needs of the old can create high demand in a construction market. In order to induce active participation of the private sector, the Ministry of Construction and Transportation, rather than the Ministry of Health and Welfare, should be in charge of the development of SCH. This is desirable in the perspective of developing new types of housing as for general housing. In this case, the Ministry of Construction and Transportation should consider geographic locations and environmental factors of each city. Moreover, the successful development of SCH needs an effort to reexamine an appropriate development plan rather than adopting the cases of developed countries without criticism. In terms of policies, the government should provide financial support for building sharing space, give an exception on a measurement rate, assist in the education of supervisors and establish a management system and so on.

• 한국통신학회논문지
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• 제27권8B호
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• pp.809-818
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• 2002

본 논문에서는 3GPP 표준인 WCDMA 시스템에 호환성을 유지하면서 적용될 수 있는 새로운 셀 탐색 알고리즘을 제안한다. 기존 WCDMA 시스템에서는 2개의 동기 채널(P-SCH 및 S-SCH)을 이용하여 셀 탐색을 수행하는데 반해 제안하는 셀 탐색 알고리즘은 하나의 동기 채널만을 이용하여 슬롯 동기와 프레임 동기 그리고 코드 그룹 아이디를 획득할 수 있다. 이를 위하여 제안하는 알고리즘에서는 기존 WCDMA의 P-SCH에 극성 코드를 이용한 극성 변조를 수행함으로써 스크램블링 코드의 그룹핑 정보를 전송한다. 제안하는 셀 탐색 알고리즘은 기존 WCDMA 셀 탐색 알고리즘에 비해 하나의 동기 채널만을 이용하기 때문에 기지국에서 송신 신호의 이득을 얻을 수 있으며 동시에 수신기의 복잡도를 줄일 수 있는 특징을 갖는다. 제안하는 알고리즘은 특히 SNR 좋지 못한 채널 환경에서 기존 셀 탐색 알고리즘에 비하여 셀 탐색 시간면에서 우수한 성능을 보임을 시뮬레이션을 통하여 검증하였다.

• Tuberculosis and Respiratory Diseases
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• 제58권2호
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• pp.120-128
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• 2005

연구배경 : 인슐린 양 성장 인자 결합 단백질-3 (IGF binding protein-3, IGFBP-3)는 생체내와 실험관내에서 인슐린 양 성장인자 매개 신호전달 체계를 억제하여 비소 세포성 폐암 세포의 증식을 조절하는 것으로 알려져 있다. 이에 본 연구에서는 비소세포성 폐암의 치료에 있어 IGFBP-3를 이용한 치료전략의 개발을 위하여 IGFBP-3(Ad5CMV-BP3)와 FTI SCH66336의 병용치료 상승작용을 분석하였다. 방 법 : 비소세포성 폐암 세포주의 성장에 Ad5CMV-BP3와 SCH66336의 병용투여가 미치는 효과를 측정하기 위하여 비소세포성 폐암 세포주와 IGFBP-3를 발현하는 recombinant adenovirus(Ad5CMV-BP3)를 이용하였고 흉선이 없는 nude mice의 등에 H1299 폐암 세포를 피하 주사한 후 Ad5CMV-BP3와 SCH66336의 병용치료 상승작용을 단일 치료와 비교 분석하였다. 결 과 : SCH66336과 Ad5CMV-BP3 병용처리는 단일 약제보다 더 큰 증식 억제효과 상승작용을 보였으며 nude mice에서도 병용치료 시 종양의 부피는 매우 의미 있는 감소를 보였다. 결 론 : 본 연구의 결과를 통하여 저자들은 SCH66336이 IGFBP-3와 병용투여시 실험실내와 생체내에서 비소 세포성 폐암세포의 세포자멸사에 상승적인 효과가 있다는 것을 처음으로 입증하였으며, 이는 비소세포성 폐암의 치료에 있어 Ad5CMV-BP3와 SCH66336의 병용치료가 임상적으로 사용될 수 있음을 시사하는 것이라 하겠다.

• 미생물학회지
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• 제32권1호
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• pp.34-39
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• 1994

Schwanniomyces castellii의 제놈 DNA로 제조된 유전자 은행으로부터 cloning된 ${\alpha}$-amylase 유전자가 Sacchromyces cerevisiae에서 발현되었다. Cloning된 삽입 DNA 절편의 크기는 약 5.0 kb이었고, Southern 및 immunoblot 분석 결과 cloning된 ${\alpha}$-amylase 유전자가 Sch. Castellii로부터 유래되었음이 확인되었다. S. cerevisiae SHY3 형질전환체에서 Sch. Castellii ${\alpha}$-amylase 유전자발현은 모균주에 비해 낮았으나, 단백질의 분자량 및 효소의 성질은 Sch. Castellii에서 분리한 ${\alpha}$-amylase의 그것과 차이가 없었다.

• 한국주거학회논문집
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• 제14권5호
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• pp.1-9
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• 2003

The purpose of this study is to consider the community design applications in the senior collective housing in Hyogo Prefecture, Japan. It was performed by two programs, application program and space design program. The former is focused on the participation of residents to the planing and design process, sharing, community activity, social interaction, and management by residents. The latter is focused on the common space(room) design. It was also performed by literature review, observation, and interview. The findings for the community design as an application program in SCH are almost the same with those in CH. But, the level of common meal and common laundry in SCH is lower than that of CH. And space design program is focused on the location and scale of common space(room) which is related to the number of users. As a result, the positive possibilities of SCH as a new residential type for the self-reliant seniors can be confirmed. The difference of community design application between CH and SCH is caused by various factors such as senior's health conditions, economic factors, and Japanese life style.