• Structural Engineering and Mechanics
• /
• v.83 no.1
• /
• pp.31-43
• /
• 2022

A nonlinear gas-spring tuned mass damper is proposed to mitigate the seismic responses of the multi-degree-of-freedom (MDOF) structure, in which the nine-story benchmark model is selected as the controlled object. The nonlinear mechanical properties of the gas-spring are investigated through theoretical analysis and experiments, and the damper's control parameters are designed. The control performance and damping mechanism of the proposed damper attached to the MDOF structure are systematically studied, and its reliability is also explored by parameter sensitivity analysis. The results illustrate that the nonlinear gas-spring TMD can transfer the primary structure's vibration energy from the lower to the higher modes, and consume energy through its own relative movement. The proposed damper has excellent "Reconciling Control Performance", which not only has a comparable control effect as the linear TMD, but also has certain advantages in working stroke. Furthermore, the control parameters of the gas-spring TMD can be determined according to the external excitation amplitude and the gas-spring's initial volume.

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
• /
• v.15 no.3
• /
• pp.264-272
• /
• 1986

The performance of vertical and horizontal tubes with multiple fins of rectangular and triangular cross section was investigated theoretically for boiling heat transfer. A simple method for numerical program assuming one-dimensional heat flow was used to predict the performance of these finned tubes and their bundles. The object of the new study was to develop optimum fin design, especially in tube bundles, considering from a viewpoint to minimize the space in which the maximum heat flux density was expected.

• Progress in Superconductivity and Cryogenics
• /
• v.12 no.2
• /
• pp.25-28
• /
• 2010

A cooldown time is one of the major factors in many cryocooler applications, especially for the design of conduction-cooled superconducting apparatus. The estimation of cooldown seeks the elapsed time to cool thermal object by a cryocooler during initial cooldown process. This procedure includes the dimension of cold mass, heat transfer analysis for cryogenic load and available refrigerating capacity of a cryocooler. This method is applied to the specific cooling system for a 3 Tesla superconducting magnet cooled by a two-stage GM cryocooler. The result is compared with that of experiment, showing that the results of proposed method have a good agreement with experiments during initial cooling of superconducting magnet.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2020.11a
• /
• pp.814-817
• /
• 2020

The number of single-person households is increasing every year, and there are also high concerns about the crime and safety of single-person households. In particular, crimes targeting women are increasing. Although home surveillance camera applications, which are mostly used by single-person households, only provide intrusion detection functions, this service utilizes AI image recognition technologies such as face recognition and object detection to provide theft, violence, stranger and intrusion detection. Users can receive security-related notifications, relieve their anxiety, and prevent crimes through this service.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2022.11a
• /
• pp.818-820
• /
• 2022

The keyword 'healing' is essential to the competitive society and culture of Koreans. In addition, as the time at home increases due to COVID-19, the demand for indoor healing services has increased. Therefore, this thesis analyzes the user's facial expression so that people can receive various 'customized' healing services indoors, and based on this, provides lighting, ASMR, video recommendation service, and facial expression recording service.The user's expression was analyzed by applying the ensemble algorithm to the expression prediction results of various CNN models after extracting only the face through object detection from the image taken by the user.

• Publications of The Korean Astronomical Society
• /
• v.39 no.2
• /
• pp.27-38
• /
• 2024

Line observations of young stellar objects (YSOs) at (sub)millimeter wavelengths provide essential information of gas kinematics in star and planet forming environments. For Class 0 and I YSOs, identification of Keplerian rotation is of particular interest, because it reveals presence of rotationally-supported disks that are still being embedded in infalling envelopes and enables us to dynamically measure the protostellar mass. We have developed a python library SLAM (Spectral Line Analysis/Modeling) with a primary focus on analyses of emission line data at (sub)millimeter wavelengths. Here, we present an overview of the pvanalysis tool from SLAM, which is designed to identify Keplerian rotation of a disk and measure the dynamical mass of a central object using a position-velocity (PV) diagram of emission line data. The advantage of this tool is that it analyzes observational features of given data and thus requires few computational time and parameter assumptions, in contrast to detailed radiative transfer modelings. In this article, we introduce the basic concept and usage of this tool, present an application to observational data, and discuss remaining caveats.

• Industry Promotion Research
• /
• v.5 no.3
• /
• pp.53-60
• /
• 2020

This paper describes the role of counselors' transitional object for the therapeutic activation of clients who have lost the function of selfobject based on Heinz Kohut's Self theory. In this study, it was an opportunity to confirm that human beings need self-target throughout their lives. Next, referring to the process of metamorphic internalization, infants return to reality from a fantasy world, experiencing parental limitations due to optimal frustration through self-targeting. The role of a counselor as a transfer target shall ensure that the counsellor establishes an cohesive self-identity and uses the appropriate self-target. And they should empathize with the over-the-topism and flauntism of the physician, and the counselor should be the object of idealization, giving the interviewer the opportunity to be recognized and identified. The counselor may provide the best frustration for the counsellor during the consultation process. When the counselor acknowledges his mistake, the counselor looks at the counselor realistically and builds a healthy self to achieve transformative internalization. If you form an cohesive self to a physician through counseling, you can empathize with others and form a healthy human relationship. Then you can control your emotions and have a vision. And the patient realizes that he or she has no choice but to live by having a relationship with the right person throughout his or her life.

• Journal of Technologic Dentistry
• /
• v.24 no.1
• /
• pp.9-18
• /
• 2002

The aim of this study is to propose effective measures for shortage of manpower of dental technology laboratory in Gangwon province by means of examining not only the history of Gangwon association, present condition of transference of members of Gangwon association from 1990, of missing members and annual rate of participation in repair education with setting object of study into Gangwon association under the influence of the Korean Dental Technology Association but also the present condition of opening and closing laboratory, amount of business connection and condition of shortage of manpower and its field with setting object of study into 28 dental technology laboratories. Results from this study are like followings : First, Gagnwon association was established in 1984 as the eleventh in the line of the board, reorganization of board is conducted 8 times up to the eighth in the line of the board in 2001. board is composed of 16 persons including president and operated its term as 3 years. Second, a number of representative and ordinary member of Gangwon association has increased gradually from 1992 to 2001. in aspect of annual rate of participation in repair education, representative's is more higher than ordinary member's overall. the worst rate of whole members' is shown as 47.9% and the its best rate is shown as 92.0%. in addition, 70$\sim$80% rate of participation into repair education is shown most frequently as 8 times of whole 20 times from 1992 to 2001. Third, 29 authorized dental technology laboratories have registered in Gangwon association until march 2002 within 9 cities and counties. in consideration of establishment location. Gangneung city has most amount as 7 laboratories(24.1%), Wonju city has 5(17.2%), Samcheok city and Sokcho city, each has 4(13.8%), Chuncheon city has 3(10.3%), Donghae city and Taeback city, each has 2(6.9%) and Yangyang and Yongwol county, each has 1(3.4%). Fourth, amount of work personnel of laboratory in Gangwon province is 1$\sim$10 persons as the maximum value. 23 laboratories(82.1%) have their own work personnel as amount of 5 and below. in aspect of main business, most of laboratories focus on the Porcelain and Crown. and 16 laboratories(57.1%) have their own expensive equipments such as Milling. its also suggests that 16 laboratories(57.1%) suffer their shortage of working personnel. specifically, 6 laboratories(21.4%) suffer the highest shortage especially in Denture field, Fifth, whole number of Gangwon association is up to 101 members (28 representatives and 73 ordinary members) until December 31th 2001. amount of immune from repair education of Gangwon association until October 2001 is up to 10 persons, and missing members from 1997 is up to 18 persons, suspension of business is up to 4 persons. in aspect of transference from 1990, transfer-in is up to 21 persons and transfer out is up to 16 persons.

• Korean Journal of Optics and Photonics
• /
• v.13 no.2
• /
• pp.92-97
• /
• 2002

A real-time OTF (optical transfer function) measuring system with on- and off-axis nodal slide bench type for the camera lens is fabricated and evaluated. It consists of a nodal slide bench including a T-bar for the OTF measurement of an off-axis object, two dimensional CCD (charge coupled device) with pixel of 9.9${\mu}{\textrm}{m}$$\times$9.6${\mu}{\textrm}{m}$ for real-time OTF measurment, and a collimating lens of focal length of 300 mm for the optimization of this system. The OTF system is corrected by using the OTF of a SIRA lens of fnumber of F/8 and focal length 50 mm. In order to confirm the reliability of the OTF system, two MTFs (modulus transfer functions) of CCTV & VIDEO lens (JAPAN, AVENIR-SE 2514) of focal length of 25mm and field of view 10.6$^{\circ}$are measured by the camera bench type OTF system of reference OTF system and the nodal slide bench type OTF system and compared with each other. As a result, these two values are agree well with each other within 4% from 0 1p/mm to 100 1p/mm.

• Journal of the Institute of Electronics Engineers of Korea SP
• /
• v.43 no.4 s.310
• /
• pp.9-18
• /
• 2006

In the digital camera system, CMOS image sensor (CIS) is widely used because its size and weight become smaller and power consumption becomes lower. However, there are common problems that colors of the recorded image do not match those of the photographed object and that spectral sensitivity of the CIS used in different cameras varies largely in each case. Therefore, color correction is needed because the spectral sensitivity of the CIS in each color is neither the same color component for most standard colors nor the appropriate color representation for any output devices. In the conventional method, a color correction is empirically obtained by a large number of iterative experiments, but the result is not so satisfied. In this paper, a new method to obtain the efficient color correction matrix for digital camera using CIS is proposed. We obtain camera transfer matrix under the certain white-balance point, and color correction matrix that makes the transfer characteristic of digital camera close to the transfer characteristic of ideal camera is obtained. The experimental results show that the transfer characteristic of digital camera by the proposed method is close to that of the ideal camera. In addition, the image quality of pictures of digital camera using the proposed method is dramatically improved.