• The Journal of the Korea Contents Association
• /
• v.9 no.10
• /
• pp.122-129
• /
• 2009

MMORPG Quest plays a strong role of motivation through compensation related with Avatar such as items and experience points rather than a role of story transfer. This situation finally made MMORPG become a difficult game that players should study the compensation of Quest for growth of a character, so it causes fixation of the user class. As a solving method of the fixation of the users, the possibility of Quest capable of strengthening play motive of various users through clarification of motivation structure of the Quest play and pluralistic understanding about players was investigated. This is a direct response to the user within the game system or how to use the player log information. The pluralistic understanding method of players will have values as a tool that can guarantee the objectivity and actual production of the data collected utilizing.

• Journal of the Korea Society of Computer and Information
• /
• v.25 no.7
• /
• pp.113-123
• /
• 2020

Obstructive sleep apnea (OSA) among sleep disorders is one of relatively common diseases. Patients can be checked for the disease through sleep polysomnography. However, as far as he diagnosis of OSA using polysomnography (PSG) is concerned, many practical problems such as an increasing number of patients, expensive testing cost, discomfort during examination, and the limited number of people for testing have been pointed out. Accordingly, for the purpose of substituting PSG researchers have been actively conducting studies on OSA diagnosis based on machine learning using bio signals. In this regard, we review a rich body of existing OSA diagnosis studies applying machine learning techniques based on bio-signal data. As a result, this paper presents a novel taxonomy of the reviewed studies and provides their comprehensive comparative analysis results. Also, we reveal various limitations of the studies using the bio signals and suggest several improvements about utilization of the used machine learning methods. Finally, this paper presents future research topics related to the application of machine learning techniques using bio signals.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.28 no.10A
• /
• pp.816-829
• /
• 2003

In this paper, we evaluate the performance of PN (Pseudo Noise) code based time hopping sequences for M-ary UWB (Ultra Wide Band) multiple access systems using the equicorrelated signal sets. In particular, we consider two different types of M-ary UWB systems in UWB indoor wireless multipath channels: The first type of the systems (System #1) has identical symbol transmission rate regardless of the number of symbols M since the length of signal pulse train is fixed while M increases, and the second type of the systems (System #2) has the same bit transmission rate regardless of M since the length of signal pulse train is extended according to the increase of M. We compare the proposed systems with those using the ideal random time hopping sequence in terms of the symbol error rate performance. Simulation results show that the PN code based time hopping sequence achieves quite good performance which is favorably comparable to that of the ideal random sequence. Moreover, as M increases, we observe that System #2 shows better robustness against multiple access interference than System # 1.

• Sleep Medicine and Psychophysiology
• /
• v.11 no.1
• /
• pp.22-28
• /
• 2004

Objective: The purpose of this study is to investigate the prevalence rate of OSA in subjects whose main sleep complaint is insomnia and to find differential factors of OSA in these insomniac subjects. Method: We reviewed the medical records and polysomnographic findings of patients referred to the Sleep Laboratory at Seoul National University Hospital from January 1996 to December 2002. Four-hundred and seventy subjects complained of insomnia as their main sleep problem (235 males and 235 females, mean age $53.6{\pm}12.4\;years$). First, we investigated the prevalence rate of OSA in these insomniac patients. Second, we compared the clinical and demographic characteristics of the OSA-associated group with those of the non-associated group. Third, we examined whether the degree or presence of differential factors within the OSA group correlate with severity of OSA, as determined by the respiratory disturbance index (RDI). Results: Among 470 insomniac subjects, 125 subjects (26.6%) were diagnosed as OSA by nocturnal polysomnography. OSA-associated subjects were significantly older ($58.4{\pm}12.3\;years$ vs. $51.8{\pm}11.2\;years$, p<0.01), and had significantly higher body mass index (BMI) ($23.4{\pm}3.3\;kg/m^2$ vs. $22.5{\pm}3.1\;kg/m^2$, p=0.44) than non-associated subjects. The OSA-associated group had more subjects with male gender (64.0% vs. 44.9%, p<0.01), hypertension (20.0% vs. 9.3%, p<0.01) or snoring (96.0% vs. 63.5%, p<0.01). Within the OSA-associated group, age had a significant positive correlation with RDI (p=0.01). Conclusion: We found that a considerable portion of patients complaining of insomnia as their main sleep problem were diagnosed as OSA. Snoring, old age, male gender, obesity, and comorbid hypertension were found to be differential factors of OSA in insomniac patients. We suggest that diagnostic efforts including nocturnal polysomnography are needed for insomniac patients with any of the above risk factors of OSA.

• Convergence Security Journal
• /
• v.3 no.2
• /
• pp.41-55
• /
• 2003

Today the traditional national intelligence activities which are mainly based on classified informations are confronted with several problems. These are excessive collection cost, morality of intelligence activity, objectivity of intelligence, intelligence dead zone and timeliness of intelligence etc. On the other hand, circumstances of national intelligence activity are rapidly changed. Those are rapid growth of internet, transformation of classified information into open one and rapid growth of intelligence capabilities of private sector. To cope these problems and circumstances, we reevaluated OSINT(Open Source INTelligence) which is collected from all kinds of open source informations on the internet. First, we classified OSINT into four categories corresponding to the traditional classified collection methods i.e., IMINT, SIGINT, HUMINT and MASINT. And we evaluate the value of OSINT in comparison with classified collection methods. Finally a system for national intelligence activity based on all kinds of open source intelligence on the internet is proposed, described and compared with the system of traditional national intelligence activity.

• Journal of the Korean Society of Costume
• /
• v.57 no.2 s.111
• /
• pp.190-201
• /
• 2007

The purpose of this study Is to reinterpret sexuality represented in modern fashion with the conception of plural sexuality from post-structuralism in socio-semiotic approach. It consists of two parts.: The first part provides the theoretical background and the methodological framework of this study. The second part ultimately accomplishes this study by empirical research, which is to infer plural sexuality articulated with fashion images in men's and women's popular fashion magazines in Korea since 2000 and sexual ideology signified in modern fashion. In this part the theoretical background was focused on the conception of sexuality on the basis of Foucault's idea, and then the framework for this study was made up from socio-semiotic perspective. The conception of sexuality in Foucauldian post-structural idea maintains the view of plural sexuality, which floats by power relationship between dominant and oppositional discourses in a specific historical context. Socio-semiotics suggests a contextual methodology to analyze the phenomena of material culture by articulating the range of material objects with that of ideology. The socio-semiotic model applied to sexuality represented in fashion is the framework of classifying into the several versions of fashion images from fashion as a material object and then inferring sexual ideology codified in them. In addition, three stages of producer/object/user in socio-semiotics were revised into 'dominant sexuality' with mainstream fashion out of dominant discourses,'oppositional sexuality' to create anti-fashion from oppositional discourses of subculture, and 'alternative sexuality' to be appropriated to dominant discourses by the mix of mainstream fashion and anti-fashion.

• Journal of Korean Philosophical Society
• /
• v.146
• /
• pp.25-48
• /
• 2018

Starting from common sense that happiness is a state where needs are satisfied, this paper suggests the intelligence and the virtues for democratic citizens. The fact that human beings exist, relate to each other, and undertake activities which can become of moral worth when joined by autonomy, equality, and responsibility, respectively, is explained. It is also discussed that happy citizens should be able to exist autonomously in the face of political power, make an equal relationship with political power and fellow citizens, and undertake responsible activities. Lastly, it is suggested that happy citizens should be able to understand the plurality of value-contents, the similarity of value-forms, and the possibility of value-realization, and then be equipped with self-respect, mutual respect, and law-respect.

• Sleep Medicine and Psychophysiology
• /
• v.15 no.2
• /
• pp.94-99
• /
• 2008

The most common cause of obstructive sleep apnea syndrome (OSAS) in childhood is adenotonsillar hypertrophy. Adenotonsillectomy improves the symptoms quite well in most cases. However, some patients could experience the OSAS again after adenotonsillectomy, who might have several risk factors such as incomplete operation, misdiagnosis, combined anatomical malformation, sinusitis or chronic allergic rhinitis, obesity, initial severe OSAS, and early onset OSAS. We report a case of 11-year-old obese boy who presented with snoring for several years. He was obese with body mass index (BMI) of $26.3kg/m^2$ and also found to have fatty liver by ultrasonogram. Initial polysomnography (PSG) showed that he met the criteria of severe OSAS with the apnea-hypopnea index (AHI) of 70.5. He underwent adenotonsillectomy and symptoms improved immediately. Four months later symptoms were relieved with AHI of 0, but 1 year after the adenotonsillectomy he started to complain snoring again and the subsequent PSG results showed that OSAS has relapsed with AHI of 43. Paranasal sinus X-ray and physical examination showed sinusitis and re-growth of adenoid. Obesity was proved not to be a contributing factor because his BMI decreased to normal range ($23.1kg/m^2$) after diet control and regular exercise. Also, liver transaminase was normalized and fatty liver was disappeared on follow-up abdominal ultrasonogram. After treatment of sinusitis, symptoms were relieved with decreased AHI (8.5). This case suggests that simple adenotonsillectomy might not be the end of OSAS treatment in childhood. Patients who had adenotonsillectomy should be followed by subsequent PSG if symptoms recur. It is also important to be aware of risk factors in the recurrent OSAS for the proper intervention according to the cause.

• Journal of Korean Philosophical Society
• /
• v.120
• /
• pp.109-130
• /
• 2011

The main purpose of this paper is to examine Putnam's recent conception of ethics, and show that it gives rise to an ineluctable incoherence with his rationalism. This suggests that Putnam's philosophy has to be far more naturalized to make his new position cogent. Putnam recently has shown some explicit turn toward pragmatism a la James and Dewey under the name of "pragmatic pluralism." Putnam says that traditional ethics has presupposed some form of ontology in one way or another, which he sees is based on an unnecessary pursuit of a misleading conception of objectivity. Putnam tries to get rid of any notion of ontology in ethics, whereby we can talk about a third view which runs between traditional objectivism and nihilistic relativism. In this sense, he defines pragmatism as "fallibilism cum antiskepticism." Putnam's suggestion makes a good sense as far as it goes. However, his continuous transition toward pragmatism is critically impeded by his own adhesion to the normative conception of "reason." In this light, Putnam himself is wobbling between Kant and Dewey, just as he describes ethics is. Dewey's pragmatism does not have recourse to the very notion of reason to secure objectivity necessary to make sense of moral experience. Putnam needs to be far more naturalized to reach cogently where he espouses, and this can be done only by renouncing the normative conception of reason.

• Cross-Cultural Studies
• /
• v.48
• /
• pp.361-389
• /
• 2017

This essay examines 'precarity politics' by Judith Butler, a well-known gender theorist and queer philosopher, in Notes Towards a Performative Theory of Assembly (2015) focused on concepts as unchosen cohabitation of Hannah Arendt and unwilled proximity of Emmanuel Levinas. Butler's precarity politics is the condition of our dispossessed political beings with fundamental vulnerability and interdependency that cannot choose with whom we will live on this Earth. Butler's political ethics is twofold: on one hand, she examines significance of 'action'' the most significant vita activa in the public area, and 'plurality'' the condition-not only the necessary condition but the possible condition-for a political life suggested by Hannah Arendt in Human Condition; on the other hand, Butler reflects upon global precarity based on a diasporic precarious life in the social world towards freedom and equality. Unchosen cohabitation of plural humans on Earth, and global pervasion of precarity, that indicates "politically induced condition in which certain populations suffer from failing social and economic networks of support and become differentially exposed to injury, violence, and death," so called "differential distribution of precariousness," are practical possibilities of ethical and equal cohabitation of different ethnic groups in the social world. Ethical obligations or ethical demand to respond to others' suffering in distance and proximity originated from precarity politics, mentioned in Precarious Life, Parting Ways, and Frames of War, could be non-foundational joint of plural people living together globally. We should presume the 'reversibility' of distance and proximity in others' suffering, based on responsiveness and responsibility of others, if we want to stay attuned to the pain of others we never chose to live together. That is the significance of Butler's 'precarity politics' with 'ethical obligation' to accept 'unchosen plurality' of living population on Earth, and 'reversibility between of distance and proximity,' in her 'new plural and embodied body politics' or 'new corporeal ontology', through human primary vulnerability, fundamental interdependency, being exposed and responsive to suffering of others.