• 한국전기전자재료학회논문지
• /
• 제21권2호
• /
• pp.104-110
• /
• 2008

In this paper we proposed a new source-drain structure for N-type MOSFET which can suppress the output resistance reduction of a device in saturation region due to soft break down leakage at high drain voltage when the gate is biased around relatively low voltage. When a device is generally used as a switch at high gate bias the current level is very important for the operation. but in electronic circuit like an amplifier we should mainly consider the output resistance for the stable voltage gain and the operation at low gate bias. Hence with T-SUPREM simulator we designed devices that operate at low gate bias and high gate bias respectively without a extra photo mask layer and ion-implantation steps. As a result the soft break down leakage due to impact ionization is reduced remarkably and the output resistance increases about 3 times in the device that operates at the low gate bias. Also it is expected that electronic circuit designers can easily design a circuit using the offered N-type MOSFET device with the better output resistance.

• 한국작물학회지
• /
• 제39권1호
• /
• pp.98-102
• /
• 1994

율무전분의 호화특성을 조사하여 품질개량 육종의 기초자료를 제공하고자 국내보존 및 일본도입 36품종을 공시재료로 하여 전분, 아밀로스 함량 및 호응집성(Gel consistency)과 아밀로그램 특성을 분석하여 얻어진 결과를 요약하면 다음과 같다. 1. 공시된 율무품종의 전분함량차이는 50.9~78%로서 평균 60.5%를 함유하였다. 2. 율무전분의 아밀로스 함량은 0~7.2%의 범위였고 gel의 길이는 평균 94mm로써 전형적인 찰전분의 특성을 나타내었다. 3. 호응집성이 강산종, 추전종, 중리재래 등은 medium에 가깝고 대부분 품종이 soft에 속하였다. 4. 공시율무의 amylograph의 호화온도, 최고점도, 최저점도 및 break down은 각각 69.0~75$^{\circ}C$, 210~520 BU, 205~425 B 및 5~135 BU의 범위로 품종간 차이가 있었다. 5. 품종간 차이가 현저했던 아밀로그램 특성은 break down type이었고 일반적으로 율무 품종은 set back이 낮았다.

• Archives of Reconstructive Microsurgery
• /
• 제20권2호
• /
• pp.108-112
• /
• 2011

Purpose: Gracilis muscle free flap transplantation is chosen in the medium sized soft tissue defect and bone exposure from trauma and chronic osteomyelitis in the lower extremity. We set a study to search for gracilis free flaps to know whether symptoms were cured or recurred in patients that have passed over 10 years from flap transplantation. Materials and Methods: From August 1995 through September 2010, we have performed 28 cases of gracilis muscle free flap in the lower extremities. Ever since no case visited to demand any discomfort, breakdown or recurrence in the flap site on outpatient basis. We made a telephone call to patients or relatives documented in the medical record and only 2 cases visited outpatient department and 9 cases postponed the visit who satisfied with the final result but 17 cases had wrong telephone numbers. Causes, area of lower extremity, recipient vessels in the lower extremity, condition of the donor thigh and overall satisfaction of the flap transplantation in activities of daily living were investigated and written down in the medical record. Results: 11 cases were reviewed after average postoperative 13.7 years. Gracilis muscle flaps were not break down at the recipient site in all cases. The wound of donor thigh wound healed good and overall activities of daily living was satisfied in all cases. Conclusion: Gracilis muscle flaps which had performed and followed up average 13.7 years revealed confident in the medium sized soft tissue defect and bone exposure from trauma and chronic osteomyelitis in the lower extremity.

• 한국식품과학회지
• /
• 제19권1호
• /
• pp.69-74
• /
• 1987

본(本) 연구(硏究)는 경(硬), 연질(軟質) 소맥(小麥)의 성숙과정(成熟過程)에 따른 탄수화물(炭水化物) 특성(特性)의 변화(變化)에 대하여 검토하였다. 종실(種實)의 수분함량(水分含量)이 감소(減少)함에 따라 천립중(千粒重)과 용적중(容積重)은 증가(增加)되었다. 배유(胚乳)의 전분함량(澱粉含量)은 출적후(出積後) $35{\sim}40$일까지 급격히 증가(增加)하였으며, 특히 조숙종(早熟種)인 조광(早光)은 B-type 전분(澱粉)의 합성(合成)이 억제되었다. Amylose와 amylopectin 함양(含量)은 성숙기간(成熟期間)에 따라 증가(增加)되었으며, pentosan의 함량(含量)도 계속증가되었다. Amylograph break-down은 성숙기간중(成熟期間中) 계속 감소(減少)되었으며. 배유(胚乳)의 전분함량(澱紛含量)과 고도(高度)의 부동법(負桐關)이 있었다.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
• /
• 제35권5호
• /
• pp.353-360
• /
• 2009

Bisphosphonates are compounds widely used in the treatment of various metabolic and malignant bone disease. Recently, an association between bisphosphonate use and a rare dental condition termed 'osteonecrosis of the jaw(ONJ)' has been reported. Bisphosphonate-related osteonecrosis of the jaw(BRONJ) is rare, but serious, side effect of bisphosphonate therapy in affected patients. It is characterized by poor wound healing and spontaneous intra-oral soft tissue break down, which lead to exposure of necrotic maxillary and mandibular bone. We reviewed 11 patients of BRONJ visited Ajou University Hospital Dental clinic from May 2007 to November 2008. The management of the patients included cessation of bisphosphonate therapy and various surgical restorative procedures and conservative care there after. Aggressive debridement is contraindicated. A new complication of bisphosphonate therapy administration, osteonecrosis of jaws, seems to be developing. The improved results after cessation of the medication should make clinicians reconsider the merits of the rampant use of bisphosphonates, while further investigation is needed to completely elucidate this complication.

• The Journal of the Acoustical Society of Korea
• /
• 제17권4E호
• /
• pp.28-34
• /
• 1998

In most switching system, the processing unit is designed to work efficiently even at relatively high loads, but when the offered traffic exceeds a particular level, the rate of completed calls can fall drastically. A single call handled by the switching system consists of a sequence of events or messages that has to be processed by the control unit. The control unit is not only incapable of handling all of the offered calls, but also its call handling capability can drop as the offered load increases. The real time available for call processing is a critical resource that requires careful management. Therefore, the overloading of this resource must be detected by a subscriber in the from of a dial tone delay or an uncompleted call which is either blocked or mishandled. The subscriber may respond by either dialing prematurely or by re-attempting a call. This action can further escalate the processors load, which is spent for uncompleted calls. Unless a proper control is used, the switching system can finally break down. In this paper, we paper, we propose a fuzzy overload detection and control method for switching systems, which can by generating fuzzy rules via fuzzy aggregation networks. Simulation results involving a switching system is given.

• 한국표면공학회지
• /
• 제40권2호
• /
• pp.91-97
• /
• 2007

In this study we investigated the oxygen effect on the nucleation and its residual stress during unbalanced magnetron sputtering. Up to 0.5% in oxygen flow rate, cubic phase (c-BN) was dominated with extremely small fraction of Hexagonal phase (h-BN) of increasing trend with oxygen concentration, whereas hexagonal phase is dominated beyond 0.75% flow rate. Interestingly, the residual stress in cubic-phase-dominated films was substantially reduced with small amount of oxygen (${\sim}0.5%$) down to a low value comparable to the h-BN case. This may be because oxygen atoms break B-N $sp^3$ bonds and make B-O bonds more favorably, increasing $sp^2$ bonds preference, as revealed by FTIR and NEXAFS. It was confirmed by experimental facts that the threshold bias voltage for nucleation and growth of cubic phase were increased from -55 V to -70 V and from -50 V to -60 V respectively. The reduction of residual stress in O-added c-BN films is seemingly resulting from the microstructure of the films. The oxygen tends to increase slightly the amount of h-BN phase in the grain boundary of c-BN and the soft h-BN phase of 3D network including surrounding nano grains of cubic phase may relax the residual stress of cubic phase.