• Journal of Yeungnam Medical Science
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• v.18 no.2
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• pp.145-169
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• 2001

In recent years, health care cost containment concerns have resulted in an increase in outpatient (or same-day) surgery. Many procedures previously performed on an inpatient surgery basis have been shifted to outpatient settings. Anesthesia for outpatient surgery is exactly the same as inpatient anesthesia, except that the primary concern is the selection of patients who can be discharged safely on the day of surgery. The anesthesiologist should have a sound rational basis for choice of pharmacologic agents that are geared to expeditious patient discharge from the hospital. Cost concerns aside, outpatient surgery has many additional advantages in the pediatric setting. It minimizes the length of time the child is hospitalized, decreases separation anxiety, promotes parental involvement in the child's postoperative care in the more congenial environment of home, and decreases risk of nosocomial infection and iatrogenic illness.

• Journal of KIISE:Databases
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• v.31 no.4
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• pp.409-421
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• 2004

A database sharing system (DSS) couples a number of computing nodes for high performance transaction processing, and each node in DSS shares database at the disk level. In case of node failures in DSS, database recovery algorithms are required to recover the database in a consistent state. A database recovery process in DSS takes rather longer time compared with single database systems, since it should include merging of discrete log records in several nodes and perform REDO tasks using the merged lo9 records. In this paper, we propose a two version caching (2VC) algorithm that improves the cache fusion algorithm introduced in Oracle 9i Real Application Cluster (ORAC). The 2VC algorithm can achieve faster database recovery by eliminating the use of merged log records in case of single node failure. Furthermore, it can improve the performance of normal transaction processing by reducing the amount of unnecessary disk force overhead that occurs in ORAC.

• The KIPS Transactions:PartD
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• v.10D no.2
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• pp.195-210
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• 2003

In this paper, we propose an enhanced concurrency control algorithm that maximizes the concurrency of multi-dimensional index structures. The factors that deteriorate the concurrency of index structures are node splits and minimum bounding region (MBR) updates in multi-dimensional index structures. The proposed concurrency control algorithm introduces PLC(Partial Lock Coupling) technique to avoid lock coupling during MBR updates. Also, a new MBR update method that allows searchers to access nodes where MBR updates are being performed is proposed. To reduce the performance degradation by node splits the proposed algorithm holds exclusive latches not during whole split time but only during physical node split time that occupies the small part of a whole split process. For performance evaluation, we implement the proposed concurrency control algorithm and one of the existing link technique-based algorithms on MIDAS-3 that is a storage system of a BADA-4 DBMS. We show through various experiments that our proposed algorithm outperforms the existing algorithm in terms of throughput and response time. Also, we propose a recovery protocol for our proposed concurrency control algorithm. The recovery protocol is designed to assure high concurrency and fast recovery.

• The Optical Journal
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• s.99
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• pp.57-63
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• 2005

1980년 일본광산업기술진흥협회(OITDA)가 설립된 이후 지속적인 성장을 거듭해 온 일본의 광산업은 설문조사가 시작된 이후 처음으로 전세계적인 IT 침체의 영향으로 인해 2001년 한해 마이너스 성장(-15.1%)을 기록했다. 그러나 광산업은 다른 어떤 산업분야보다 훨씬 빠른 속도로 회복하여 다음해인 2002년에는 2.7%의 플러스 성장을 기록했고 다음해인 2003년에는 성장 곡선을 그대로 유지해 전년도 성장 예측 치를 뛰어넘는 19.8%라는 기록적인 성장을 달성했다. 2004년에는 8조 엔의 매출(전년도 대비 13.8% 성장)을 기록했고 2005년에는 9조엔(10.4%상향 조정)이상의 매출 목표를 세우고 있다. 이처럼 일본의 광산업은 계속해서 성장해 나갈 것이며 고부가가치 산업 중 하나로서 일본 경제 회복의 일익을 담당하고 있다.

• Proceedings of the KIEE Conference
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• 2005.11a
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• pp.3-5
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• 2005

Ni/Au 쇼트키 접합의 산화를 통해 항복전압이 증가하고 누설 전류가 감소한 수평방향 GaN 쇼트키 장벽 다이오드를 제작하였다. 산화 과정 후, 턴-온 전압이 미세하게 증가하였으며 높은 애노드 전압하에서 애노드 전류가 증가하였다. 5분과 10분의 산화 과정 후, 누설 전류는 1nA 이하 수준으로 현저히 감소하였다. Edge Termination 방법으로 Floating Metal Ring을 사용하고, 산화 과정을 적용하여 제안된 GaN 쇼트키 장벽 다이오드의 항복전압은 750볼트의 큰 값을 얻을 수 있었다. 상온과 $125^{\circ}C$ 에서 제작한 GaN 쇼트키 장벽 다이오드의 역방향 회복 파형도 측정하였으며, 제작한 소자는 매우 빠른 역방향 회복 특성을 보였다.

• Journal of Dental Rehabilitation and Applied Science
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• v.32 no.2
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• pp.135-140
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• 2016

Patients who get tooth loss would also lost their esthetic, stability and functional aspect suddenly. They have to get provisional restoration immediately. This case reports a satisfied result that thermoforming technique is good for patients to get injury from unexpected tooth loss.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2022.10a
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• pp.542-544
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• 2022

In this study, a basic study was conducted to confirm the wound recovering ability using LEDs. After cultured fibroblast on 6-wells we formed a wound. Here, LEDs of a specific wavelength are irradiated and check the wound healing through Matlab image processing. As a result, it was confirmed that fibroblast recovered faster when LED was irradiated.

• Korean Chemical Engineering Research
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• v.45 no.5
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• pp.500-505
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• 2007

The objectives of this research were to (1) identify the membrane fouling potential due to different fractions of NOM (2) correlate the physicochemical properties of NOM and membranes with the adsorption of humic substances on membrane (4) find out the effect of membrane physical and chemical washing according to membrane material. The static adsorption test and adsorption test showed that hydrophobic organics adsorbed much more quickly than hydrophilic organics. In case of the effect of membrane properties on the adsorption of organic fractions, the adsorption rate ratio(a) of hydrophobic membrane (0.016, 0.077) was greater than that of hydrophilic membrane (0.010, 0.033) regardless of the kind of organic fractions. This suggests that the UF membrane fouling were occurred mainly by internal pore size decreasing due to adsorption of organic into pore surface for hydrophobic membrane, and by sieving of organics and forming a gel layer on the membrane surface for hydrophilic membrane. In conclusion, the decrease in the pore volume, which was caused by the organic adsorption into the internal pore, was greater with the hydrophobic membrane than with the hydrophilic membrane. In case of the effect of membrane properties on permeate flux, the rate of flux decline for the hydrophobic membrane was significantly greater than that for the hydrophilic membrane.

• Elastomers and Composites
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• v.40 no.2
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• pp.112-118
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• 2005

Influence of a silane coupling agent on the reatraction behaviors of NR vulcanizates reinforced with carbon black and c lay was studied. Bis-(3-(triethoxysilyl)-propyl )-tetrasulfide (TESPT) was used as a silane coupling agent. The vulcanizates containing the silane coupling agent were, on the whole, recovered faster than those without the silane coupling agent. However, for the vulcanizate with the higher clay content at low temperature region (below $-12^{\circ}C$), the vulcanizate containing the silane coupling agent was recovered slower than that without the silane coupling agent. The recovery difference of the vulcanizates with and without silane coupling agent decreased with increase of clay content. The experimental results were explained with crosslink density, modulus, and bound rubber content.

• Journal of KIISE:Information Networking
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• v.29 no.4
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• pp.412-427
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• 2002

This paper proposes a restoration scheme based on mobility learning and prediction in the presence of the failure of mobility databases in mobile communication systems. In mobile communication systems, mobility databases must maintain the current location information of users to provide a fast connection for them. However, the failure of mobility databases may cause some location information to be lost. As a result, without an explicit restoration procedure, incoming calls to users may be rejected. Therefore, an explicit restoration scheme against the failure of mobility databases is needed to guarantee continuous service availability to users. Introducing mobility learning and prediction into the restoration process allows systems to locate users after a failure of mobility databases. In failure-free operations, the movement patterns of users are learned by a Neuro-Fuzzy Inference System (NFIS). After a failure, an inference process of the NFIS is initiated and the users' future location is predicted. This is used to locate lost users after a failure. This proposal differs from previous approaches using checkpoint because it does not need a backup process nor additional storage space to store checkpoint information. In addition, simulations show that our proposal can reduce the cost needed to restore the location records of lost users after a failure when compared to the checkpointing scheme