• 정보보호학회지
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• 제18권6호
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• pp.58-69
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• 2008

현재 널리 쓰이고 있는 다양한 형태의 모바일 디바이스들을 무선 센서 네트워크 환경에 접목하여 보다 편리하고 효율적으로 센서 네트워크 서비스를 제공받을 수 있는 모바일 USN(Ubiquitous Sensor Network) 서비스 기술을 소개하고, 그 응용 서비스 모델인 Nike 플러스 i-Pod 스포츠 키트 플랫폼에 대해 살펴본다. 그리고, 해당 서비스의 보안취약성을 분석하여 모바일 USN에서의 보안 및 프라이버시 문제를 제시하고, 향후 제공되어질 다양한 모바일 USN 보안 응용 서비스들에 대해 고찰해본다.

• 지식경영연구
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• 제14권3호
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• pp.37-54
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• 2013

Technology standards have gained importance as global market becomes more competitive. Since a technology acknowledged as a standard brings significant benefits to the developer firm, firms in the IT industry tend to pursue standardization for the technology, being it proprietary or open. However, the paths or strategic implications are seldom discussed in academia. Therefore, our study uses iPhone of Apple, one of the proprietary standards successes, to further understand corporate strategies over two standard choices. Our case study suggests that iPhone's entry timing was optimal for creating a new mobile environment. Design excellence and user-friendly interface increased networking effects and switching costs among consumers. Apple developed independent mobile operating system (iOS) through improvement on the existing operating system. During the process, Apple chose proprietary standard and, by installing the same UX on its sibling products such as iPod Touch or iPad, overcame the subsequent problems that might arise from the limited use of iOS. Based on the capability of concurrently developing both hardware and software, Apple connected operating system, machine, and contents, which deems to contribute to its proprietary standards success. We argue that this strategy should be considered for firms which plan proprietary standard strategy.

• Journal of Chest Surgery
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• 제18권2호
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• pp.182-192
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• 1985

[here are so many reports that pulsatile blood flow provides physiologic organ perfusions during cardiopulmonary bypass. So, we compared the recent 30 cases undergoing cardiac surgery by Cobe-Stckert pulsatile roller pump with another 30 cases by Polystan nonpulsatile roller pump. Pulsatile flow was applied during aortic-cross clamping period when synchronized to internal EKG simulator, and perfusion mode was changed to continuous nonpulsatile flow after declamping of aorta. Age, sex, weight, and disease entities were comparable and operative techniques were similar between two groups. 1. There were no differences in average ACC time, ECC time, and Operation time. 2. Postoperative artificial respiration time was 6hrs 30mins in nonpulsatile group and 4hrs 48mins in pulsatile group, and detubation time after ventilator weaning was 2hrs 44mins in nonpulsatile group and 1hrs 43mins in pulsatile group. 3. Average pulse pressure was 8mmHg in nonpulsatile group and 55mmHg in pulsatile group, and a mean arterial pressure was 66.0mmHg in nonpulsatile group and 60.7mmHg in pulsatile group. 4. Mean urine-output during ACC;ECC period was 9.717.3;9.913.2ml/kg/hr in nonpulsatile group and 14.215.0;15.817.5 in pulsatile group [p<0, 05], and thereafter progressive decrease of differences in urine output between two groups until POD 2, and lesser amounts of diuretics was needed in pulsatile group during same postoperative period. Serum BUN/Cr level showed no specific difference and urine concentration power was well preserved in both groups. 5. Plasma proteins and other Enzymes showed no differences between two groups, but serum GOT/GPT level was higher in nonpulsatile group till POD 2. 6. Serum Electrolytes showed no differences between two groups. 7. WBC, RBC, Platelet counts, Hgb and Hct were not different and Coagulogram was well preserved in both groups. 8. Plasma free Hgb level was 7.09mg% in pulsatile group compared with 3.48mg% in pulsatile group on POD 1 but was normalized on POD 2. Gross hemoglobinuria after ECC was noted in 6 cases [20%] of pulsatile group and 4 cases [13%] of nonpulsatile group. 9. In both groups, most patients were included in NYHA class III to IV [28 cases;93% in nonpulsatile group, 22 cases;73% in pulsatile group] preoperatively, and well improved to class I to 11[22 cases; 73% in nonpulsatile group, 30 cases; 100% in pulsatile group] postoperatively. There were 7 operative mortalities in nonpulsatile group only, which were 5 cases of TOF with hepatic failure, 1 case of multiple VSDs with low out-put syndrome, and 1 case of mitral valvular heart disease with cardiomyopathy. We concluded that the new, commercially available Cobe-Stckert pulsatile roller pump device was safe, simple, and reliable.

• 한국CDE학회논문집
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• 제16권1호
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• pp.31-40
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• 2011

Product-service system (PSS) is a system of products and service, supporting networks and infrastructure that is designed to be competitive. PSSs satisfy customers' needs more effectively and have a lower environmental impact than traditional business models. Therefore, many companies and governmental institutes are eager to implement the PSSs as a new business model. In this paper, we focus on industrial practices as new business models for the company. PSS, especially, is popular in electronic industry, so one can often observe such examples as iPod, iPhone, e-Book and etc in the field. We first thoroughly investigate the current practices of PSS in Korean electronic industry. The examples are surveyed and projected directions are given. Then, non-electronic PSSs are surveyed. Especially mechanical PSSs are intensively discussed. Based on the survey results, we propose several major development strategies of Sustainable PSS (SPSS). SPSS will bring a competitive edge for company as realization of sustainable development of PSS considering economy, society, and environment.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2001년도 추계학술대회논문집A
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• pp.246-251
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• 2001

The performance demonstration round robin test was conducted to quantify the capability of ultrasonic inspection for in-service and to address some aspects of reliability for nondestructive evaluation. The fifteen inspection teams who employed procedures that met or exceeded ASME Sec. XI code requirements detected the pinping of nuclear power plant with various cracks to evaluate the capability of detection. With data from PD-RR test, the performance of ultrasonic nondestructive inspection could be assessed using probability of detection and length and depth sizing of cracks.

• 대한원격탐사학회지
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• 제26권5호
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• pp.511-525
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• 2010

MTSAT-1R의 적외 채널 밝기온도와 마이크로웨이브 강수량 자료를 이용하여 강수량을 추정하였다. 정지위성의 밝기온도와 다양한 마이크로웨이브(SSM/I, SSMIS, AMSU-B, AMSRE, TRMM) 강수량의 시공간일지 자료생성 및 관계성을 분석하여 MTSAT-1R 밝기온도와 마이크로웨이브 강수량의 조견표를 작성하였으며 밝기온도에 적용하여 강수량을 산출하였다. 산출 강수량은 지상 AWS 및 TRMM 위성자료를 이용하여 검증하였다. TRMM 2A12(TMI) 방법에 산출 강수량은 AWS 및 TRMM3B42 강수량 검증에서 상관계수는 0.38과 0.61, RMSE는 5.81과 2.44 mm/hr, PC는 0.79와 0.84 그리고 POD는 0.65와 0.87로 가장 높은 결과를 보였다. 전체적으로 위성을 이용한 강수량 산출에서 AWS 강수량과 비교하여 5 mm/hr 이상 그리고 TRMM3B42 강수량과 비교하여 2 mm/hr 이상 많은 강수를 추정하였다. 강수량의 검증 결과는 TRMM 2A12, AMSRE, SSM/I, AMSU-B 및 SSMIS 계열 방법순서로 상관성 등의 대부분 검증에서 높은 결과를 나타내었다.

• Journal of Chest Surgery
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• 제28권11호
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• pp.1025-1031
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• 1995

Thirty patients who underwent esophageal resections due to esophageal carcinoma and benign strictures, and esophagovisceral anastomoses were performed by hand suture in 11 patients[Group I and by using the end to end anastomosis[EEA stapler in 19 patients[Group II . Anastomoses were performed in the thoracic cavity in 24 patients[Right 19, Left 5 and in the cervical area in 6 patients. There was one operative mortality[3.3% in a cancer patient who underwent Ivor-Lewis operation using EEA stapler. She expired on POD 38 days due to renal failure and sepsis. There were two anastomotic leakage in the sutured group and no anastomotic leakage in the stapled group. Late anastomotic strictures occurred in 10 patients[52.6% in the stapled group compared to 2 patients[18.1% in the sutured group. Most of the patients with late anastomotic strictures responded to one or two trials of TTS dilations. Using EEA stapler in performing esophagovisceral anastomosis is a safe method with acceptable range of complication rate, and total admission period after the operation for group I was 30.3 days compared to 25.4 days in group II although it had no clinical significance. The follow up was possible in 23 patients; 5 patients in group I died within mean 12.6 months and 9 patients in group II within mean 14.2 months.

• Journal of Plant Biotechnology
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• 제6권4호
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• pp.205-212
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• 2004

The objectives were to compare the salt tolerance levels in the parental rice cultivar, Dongjinbyeo, and induced mutagenesis derived its lines for plant height, MDA, ATPase, POD, and 2-dimensional protein electrophoresis pattern in NaCl-containing hydroponic nutrient solutions. Rice plants isolated from a population of rice (Oryza sativa L. cv. Dongjinbyeo) mutation lines, which were generated in combination with in vitro selection and gamma-ray, exhibited salt tolerance. Line No. 18 had the longest plant, whereas NaCl-sensitive line (No. 25) had the shortest plant. The parent, and the sensitive line showed severe damage from salt stress. Tolerant lines (No. 18, 50) had a lower malonaldehyde (MDA) content than the sensitive one (Dongjinbyeo, No. 25) during salt stress. Several proteins showed significant quantitative variation through 2DE; phosphoribulokinase, peroxidase, oxygen evolving enhancer 1 and the $H^+-ATPase$, which are known to be involved in salt tolerance. The effect of salt on peroxidase and $H^+-ATPase$ activity in the seedlings of two groups with contrasting genotypes of rice was studied. A greater activity was recorded in the tolerant lines as compared to the sensitive ones (P<0.05, Duncan's test). The results indicate that salt tolerant lines expressed more salt stress-inducible proteins associated with salt tolerance than the sensitive lines during salt stress.

• 한국작물학회지
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• 제46권5호
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• pp.380-386
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• 2001

Dry matter(DM) accumulation in different plant parts of two Vigna spp., blackgram(Vigna mungo) and mungbean(Vigna radiata), was compared at different levels of salinity. Two vaarieties of each of blackgram (Barimash-1 and Barimash-2) and mungbean(Barimung-3 and Barimung-4) were grown with 50, 75 and 100mM NaCl solutions and tap water as a control till maturity. The DM accumulation in all plant parts of the two crops devreased with the increasing salinity levels. The reducation was severe in mungbean compared to blackgram. On an average mungbean produced only 3% grain yield compared to 37% in blackgram at 100mM NaCl. The salinity induced growth reduction was relatively less in Barimash-2 than that in Barimash-1. In mungbean, the relative DM production of Barimung-3 was greater than Barimung-4. The extent of biomass reducation due to salinity in different plant parts was not similar. At maturity the rank of biomass accumulation (at 100 mM NaCl) in different plant parts of blackgram was in decreasing order by seeds pod$^{-1}$ (97%), branch plant$^{-1}$ (88%), 1000-grain weight (79%), plant height(72%), pods plant$^{-1}$ (50%), leaf weight and root mass(both 49%) and stem weight (48%). In mungbean, the rank was in decreasing order by 1000-grain weight (57%), leaf weight (54%), plant height (52%), seeds pod$^{-1}$ (50%), branch plant$^{-1}$ (41%), root weight (34%), stem weight (24%) and pods plant$^{-1}$ (6%). Therefore, salinity reduced grain yield more than straw and roots of the Vignaq spp., and blackgram is relatively more salt-tolerant than mungbean.

• 정보와 통신
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• 제29권7호
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• pp.16-24
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• 2012

Apple의 iPod Touch가 등장한 이래로, 다양한 모바일 디바이스에서 터치 인터페이스가 사용자 입력 수단으로서 사용되고 있다. 또한 최근 터치 인터페이스 기술은 터치할 때 사용자에게 실감나는 촉각 피드백을 제공하기 위한 다양한 방법을 시도하고 있다. 촉각 피드백의 유용성은 터치 입력에 대한 즉각적인 피드백, 오디오나 그래픽과 융합하여 사실적이고 직관적인 피드백 제공 등으로 요약할 수 있다. 이러한 장점은 터치 인터페이스 사용에 대한 사용자 경험 (User Experience)을 차별화 할 수 있기 때문에 제품 경쟁력에도 도움이 된다. 본 고에서는 촉각 피드백을 제공하는 햅틱 시스템에 대해 일반적인 내용을 알아보고, 특히 터치 인터페이스를 갖는 모바일 디바이스에서 사용될 수 있는 촉각 제 시 방법 및 촉각 액추에이터의 최근 기술동향에 대해 살펴본다.