• 사상체질의학회지
• /
• 제29권3호
• /
• pp.224-231
• /
• 2017

Objectives Several researches have been done to develop instruments or questionnaire for diagnosis of sasang constitution. In this study, we developed a user-friendly web system to enhance the utilization of KS-15. Methods The KS-15 Web application was constructed by considering the responsive web design and easy survey answer. This system is designed only to authorized users for security purposes, and provides two modes, simple mode and expert mode, depending on the purpose of using the system. A simple mode do not keep user information and survey answer in the database. An expert mode support management of patients, diagnosis of sasang constitution and statistical functions. Results & Conclusions The developed KS-15 system can be operated from any smart device's web browser. In order to use information in clinic field, it was developed so that it can be accessed only by authorized users. It can be divided into an account which can use only simple mode and an account which can use expert mode by using a difference in access authority. These functions can enhance the applicability of sasang constitution in real life such as clinical or education.

• 한국산업정보학회논문지
• /
• 제23권3호
• /
• pp.1-11
• /
• 2018

이 논문은 OS가 제공하는 소프트웨어 타이머를 사용한 네트워킹 스택의 구현 상황에서 고도의 정확성이 요구되는 시분할 동기적 통신의 신뢰성 문제를 다룬다. IEEE 802.15.4를 목표 프로토콜로 선정해 비컨 동기화의 신뢰성 향상 이슈를 상세히 탐구한다. 먼저, IEEE 802.15.4 비컨 모드의 구현에 소프트웨어 타이머를 사용할 때, 소프트웨어 타이머에 사용되는 하위 하드웨어 타이머 인터럽트의 처리 지연 및 유실과 소프트웨어 타이머 관리 오버헤드 등이 실제로 비컨 동기화의 저해 요인으로 작용한다는 점을 실험을 통해 확인한다. 이러한 상황을 개선하기 위한 제안한 비컨 대기시간 보정기법은 비컨 동기화의 신뢰성을 향상시킨다는 점을 입증한다.

• 대한화학회지
• /
• 제22권6호
• /
• pp.380-385
• /
• 1978

진공미량저울을 사용하여 Spheron 6 위에서 o-크실렌의 여러 온도에서의 흡착등온곡선을 얻고 이들로 부터 BET 방법을 써서 흡착분자 단면적을 구하였다. 이 단면적의 값은 $-15^{\circ}C$까지에서는 변화가 없었고 -15와 $-14^{\circ}C$ 사이에서 갑자기 변하여 $-14^{\circ}C$ 이상의 온도에서는 다시 일정한 값을 유지하였다. 이 결과는 $-15^{\circ}C$ 보다 낮은 온도에서는 촘촘히 쌓인 편재흡착이 일어나고 $-14^{\circ}C$ 이상의 온도에서는 벤젠고리를 중심으로한 하나의 회전자유도를 얻는 것으로 생각된다.

• 인터넷정보학회논문지
• /
• 제10권4호
• /
• pp.213-222
• /
• 2009

IEEE 802.15.3 HR-PAN은 PHY와 MAC으로 구성되어 있다. 그 중 MAC 기술은 부족한 채널 자원을 관리하는 중요한 역할을 한다. 기존 IEEE 802.15.3의 MAC 프로토콜에서 각 DEV에게 채널을 할당하는 방법은 네트워크의 상태나 주위 환경과 무관하게 고정된 형태이다. 이 논문에서 제안한 Hybrid MAC 프로토콜은 IEEE 802.15.3 HR-WPAN 환경에서 네트워크의 상태에 따라 TDMA 방식과 CSMA 방식을 유동적으로 사용할 수 있게 된다. 이 논문에서는 TDMA의 장점인 충돌 없는 전송시간의 보장과 CSMA의 장점인 높은 채널 사용률을 결합하여 802.15.3의 standard MAC보다 보다 높은 전송률을 보이는 Hybrid MAC을 제안한다.

• 한국해안해양공학회지
• /
• 제19권4호
• /
• pp.375-384
• /
• 2007

[ $Pad{\acute{e}}$ ] 근사에 의한 포물형 근사모형들을 제시하였고 $Pad{\acute{e}}$(15, 15) 근사모형은 일정 경사의 지형에 대한 엄밀해와 비교할 때 입사각 $80^{\circ}$까지 적용 가능함을 보였다. 포물형 근사식에 대한 체계적인 유도방법을 보인 후, 본 연구에서는 15차 $Pad{\acute{e}}$ 근사모형까지 나타내었고 일정 경사지형에서의 파랑변형에 대한 수치결과들을 제시하였다.

• Journal of Communications and Networks
• /
• 제15권1호
• /
• pp.87-101
• /
• 2013

In industrial applications, sensor networks have to satisfy specified time requirements of exchanged messages. IEEE 802.15.4 defines the communication protocol of the physical and medium access control layers for wireless sensor networks, which support real-time transmission through guaranteed time slots (GTSs). In order to improve the performance of IEEE 802.15.4 in industrial applications, this paper proposes a new traffic scheduling algorithm for GTS. This algorithm concentrates on time-critical industrial periodic messages and determines the values of network and node parameters for GTS. It guarantees real-time requirements of periodic messages for industrial automation systems up to the order of tens to hundreds of milliseconds depending on the traffic condition of the network system. A series of simulation results are obtained to examine the validity of the scheduling algorithm proposed in this study. The simulation results show that this scheduling algorithm not only guarantees real-time requirements for periodic message but also improves the scalability, bandwidth utilization, and energy efficiency of the network with a slight modification of the existing IEEE 802.15.4 protocol.

• Bulletin of the Korean Chemical Society
• /
• 제19권8호
• /
• pp.847-851
• /
• 1998

13C, 15N, and 29Si NMR chemical shifts have been computed for selected X-substituted silatranes (X=Cl, F, H, CH3) using Gauge-Including Atomic Orbitals (GIAO) and Continuous Set of Gauge Transformations (CSGT) at the Hartree-Fock level of theory. The isotropic 13C chemical shifts are largely insensitive to substituent-induced structural changes. In this study, the isotropic 13C chemical shifts GIAO and CSGT calculations at the HF/6-31G and HF/6-31G* levels are sufficiently accurate to aid in experimental peak assignments. The isotropic 13C chemical shifts X-substituted silatranes at HF/6-31G* level are approximately 4 ppm different from the experimental values. In contrast, the isotropic 15N and 29Si chemical shifts and the chemical shielding tensors are quite sensitive to substituent-induced structural changes. These trends are consistent with those of the experiment. The 15N chemical shift parameters demonstrate a very clear correlation with Si-N distance, especially when we use the polarization function. Changes in anisotropy, 3a as well as in the 15N isotropic chemical shifts are due primarily to changes in the value of a.. But in case of "Si the correlations are not as clean as for the 15N chemical shift.

• Journal of Magnetics
• /
• 제7권4호
• /
• pp.143-146
• /
• 2002

Mechanical milling technique is considered to be a useful way of processing the fine Nd-Fe-B-type powder with high coercivity. In the present study, phase evolution of the $Nd_{15}(Fe_{1-x}Co_{x})_{77}B_{8}$ (x=0-0.6) alloys during the high energy mechanical milling and annealing was investigated. The effect of Co-substitution on the crystallization of the mechanically milled $Nd_{15}(Fe_{1-x}Co_{x})_{77}B_{8}$ amorphous material was examined. The Nd-Fe-B-type alloys can be amorphized completely by a high-energy mechanical milling. On annealing of the amorphous material, fine $\alpha$-Fe crystallites form first from the amorphous. These fine $\alpha$-Fe crystallites reacts with the remaining amorphous afterwards, leading to crystallization to $Nd_2Fe_{14}$B phase. The Co-substitution for Fe in $Nd_{15}(Fe_{1-x}Co_{x})_{77}B_{8}$ ($\mu$x=0∼0.6) alloys lower significantly the crystallization temperature of the amorphous phase to the $Nd_2Fe_{14}$B phase. The mechanically milled and annealed $Nd_{15}Fe_{77}B_8$ alloy without Co-substitution exhibits consistently better magnetic properties with respect to the alloys with Co-substitution.

• Advances in pediatric surgery
• /
• 제15권2호
• /
• pp.180-185
• /
• 2009

We report a case of nonfunctioning neuroendocrine tumor of the pancreas in a 15-year-old girl who presented with back pain. On physical examination, there was mild tenderness in the left upper quadrant of the abdomen. The patient had no pancreatic hormone-associated symptoms. An abdominal ultrasonography showed a well-demarcated hypervascular solid mass with calcification in the tail of the pancreas. An abdominal computed tomography scan showed a $6{\times}5cm$ sized well-encapsulated enhancing solid mass with cystic component in the tail of the pancreas. Distal pancreatectomy was performed. Pathology revealed awelldifferentiated nonfunctioning low grade malignant neuroendocrine tumor of the pancreas. The postoperative course was uneventful.

• 정보통신설비학회논문지
• /
• 제8권3호
• /
• pp.132-137
• /
• 2009

In this paper, a position recognition system is designed, implemented, and tested using IEEE 802.15.4a PHY (CSS) hardware and Tiny OS environment. The system is designed with extensibility and flexibility. The system consists of five kinds of nodes which have different functions from each other. Three communication channels are used for collision avoidance. In each cell, an arbiter node is used to minimize message collisions. The proposed arbitration protocol is designed to support mobility of arbitrary target nodes. Target nodes calculates their locations with communications to four location reference nodes which are placed on the comers of each cell.